WESTERN BANCORP
S-4/A, 1998-08-14
STATE COMMERCIAL BANKS
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<PAGE>
   
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON AUGUST 13, 1998
    
   
                                                      REGISTRATION NO. 333-57759
    
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
   
                                   FORM S-4/A
    
 
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
 
                                WESTERN BANCORP
             (Exact Name of Registrant as Specified in its Charter)
 
<TABLE>
<S>                                  <C>                                  <C>
            CALIFORNIA                              6712                              95-3863296
  (State or Other Jurisdiction of       (Primary Standard Industrial               (I.R.S. Employer
  Incorporation or Organization)         Classification Code Number)            Identification Number)
</TABLE>
 
   
         4100 NEWPORT PLACE, SUITE 900 NEWPORT BEACH, CALIFORNIA 92660
                                 (949) 863-2444
    
         (Address, including zip code, and telephone number, including
            area code, of registrant's principal executive offices)
 
                          JULIUS G. CHRISTENSEN, ESQ.
            EXECUTIVE VICE PRESIDENT, GENERAL COUNSEL AND SECRETARY
                                WESTERN BANCORP
                         4100 NEWPORT PLACE, SUITE 900
                        NEWPORT BEACH, CALIFORNIA 92660
                                 (949) 863-2459
 
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
                            ------------------------
 
                                WITH COPIES TO:
 
   
       STANLEY F. FARRAR, ESQ.                      ARTHUR COREN, ESQ.
         Sullivan & Cromwell                 Horgan Rosen Beckham & Coren LLP
        1888 Century Park East                 21700 Oxnard St., Suite 1400
        Los Angeles, CA 90067                    Woodland Hills, CA 91367
            (310) 712-6600                            (818) 340-6100
 
    
                            ------------------------
 
   APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE OF THE SECURITIES TO THE
                                    PUBLIC:
 As soon as practicable after the effective date of this Registration Statement
 and the satisfaction or waiver of all other conditions to the Merger described
                       in the Proxy Statement-Prospectus.
                            ------------------------
 
    If the securities being registered on this form are being offered in
connection with the formation of a holding company and there is compliance with
General Instruction G, check the following box. / /
 
    If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering. / /
 
    If this form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. / /
                            ------------------------
 
                        CALCULATION OF REGISTRATION FEE
   
<TABLE>
<CAPTION>
                                                                                 PROPOSED MAXIMUM    PROPOSED MAXIMUM
                TITLE OF EACH CLASS OF                       AMOUNT TO BE         OFFERING PRICE        AGGREGATE
              SECURITIES TO BE REGISTERED                    REGISTERED(1)         PER UNIT(2)      OFFERING PRICE(2)
<S>                                                      <C>                    <C>                 <C>
Common Stock, no par value.............................    2,425,033 shares           $17.00           $97,598,360
 
<CAPTION>
 
                TITLE OF EACH CLASS OF                       AMOUNT OF
              SECURITIES TO BE REGISTERED                 REGISTRATION FEE
<S>                                                      <C>
Common Stock, no par value.............................       $28,792
</TABLE>
    
 
(1) Represents the estimated maximum number of shares of Common Stock, no par
    value, of Western Bancorp ("Western Common Stock") that are issuable upon
    consummation of the merger of Bank of Los Angeles ("BKLA") with Santa Monica
    Bank, a wholly-owned subsidiary of Western Bancorp (the "Merger").
 
(2) Pursuant to Rule 457(f)(1), the registration fee is based on the average of
    the high and low sale prices on June 23, 1998 of the Common Stock, no par
    value ("BKLA Common Stock"), of BKLA on the Nasdaq National
    Market-Registered Trademark- and computed based on the estimated maximum
    number of shares of BKLA Common Stock that may be converted into the shares
    of Western Common Stock to be registered.
                            ------------------------
 
    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT BECOMES EFFECTIVE
ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a), MAY
DETERMINE.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
 
   
<TABLE>
<S>                                            <C>
                                                          CORPORATE HEADQUARTERS
                                                        8901 SANTA MONICA BOULEVARD
BANK OF LOS ANGELES                                WEST HOLLYWOOD, CALIFORNIA 90069-4901
                                                               310-550-8900
                                                             FAX 310-843-1498
</TABLE>
    
 
   
                                                                 August 18, 1998
    
 
Dear Shareholder:
 
   
    You are cordially invited to attend a special meeting of shareholders of
Bank of Los Angeles ("BKLA") to be held on September 23, 1998, at 5:30 p.m. (the
"Special Meeting" or the "BKLA Meeting") which is being held in lieu of an
annual meeting. At such time you will be asked to consider and vote on a
proposal to approve the principal terms of a proposed merger (the "Merger") of
BKLA with and into Santa Monica Bank, a wholly-owned subsidiary of Western
Bancorp ("Western"), pursuant to an Agreement and Plan of Merger (the "Merger
Agreement"), dated as of April 16, 1998, and amended and restated as of June 24,
1998 and July 16, 1998, by and among Western, Santa Monica Bank and BKLA. Upon
the Merger becoming effective, each outstanding share of common stock, no par
value, of BKLA ("BKLA Common Stock") (other than as provided in the Merger
Agreement) will be converted into 0.4224 shares of common stock, no par value
per share, of Western (the "Consideration"). For a more detailed description of
the terms and conditions of the Merger see "THE MERGER AGREEMENT" in the
attached Proxy Statement-Prospectus and a copy of the Merger Agreement, which is
reproduced as Appendix A thereto. Additional information about the Merger, Santa
Monica Bank and Western are contained in the accompanying Proxy
Statement-Prospectus and the appendices thereto, all of which should be
carefully reviewed.
    
 
   
    THE BOARD OF DIRECTORS OF BKLA HAS CONCLUDED THAT THE MERGER IS IN THE BEST
INTERESTS OF BKLA AND THE BKLA SHAREHOLDERS AND UNANIMOUSLY RECOMMENDS THAT THE
BKLA SHAREHOLDERS VOTE "FOR" THE APPROVAL OF THE PRINCIPAL TERMS OF THE MERGER.
Wedbush Morgan Securities, BKLA's financial advisor, has delivered to the BKLA
Board its opinion, dated April 15, 1998 and updated on August 17, 1998, that the
Consideration received by the BKLA shareholders pursuant to the Merger is fair
to the shareholders from a financial point of view. The opinion of Wedbush
Morgan Securities, dated August 17, 1998 (and certain assumptions and
qualifications therein), is described in the accompanying Proxy
Statement-Prospectus and reproduced in Appendix B thereto.
    
 
    At the Special Meeting, each BKLA shareholder will also be asked to set the
number of directors at nine, and consider and approve the election of nine
directors to hold office until the Merger is consummated or, if the Merger is
not consummated, until the next annual meeting of BKLA and until their
successors have been elected and duly qualified.
 
    It is important that your shares be represented and voted at the Special
Meeting regardless of the number of shares you own and whether or not you plan
to attend the Special Meeting. The affirmative vote of the holders of a majority
of BKLA Common Stock entitled to vote at the Special Meeting is required for
approval of the principal terms of the Merger. Your failure to vote for approval
of the principal terms of the Merger has the same effect as voting against the
Merger. Therefore, we urge you to sign, date and mail the enclosed proxy. If you
decide to attend the Special Meeting and wish to vote in person, you may
withdraw your proxy at that time.
 
    YOU SHOULD NOT SEND IN SHARE CERTIFICATES AT THIS TIME.
 
                                          Sincerely,
 
                                                [LOGO]
 
                                          Adriana M. Boeka
                                          CHAIRMAN OF THE BOARD
 
                                                       [LOGO]
 
                                          John J. Feldman
                                          PRESIDENT AND CHIEF EXECUTIVE OFFICER
<PAGE>
                   NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
                             OF BANK OF LOS ANGELES
         TO BE HELD AT BEVERLY HILLS, CALIFORNIA, ON SEPTEMBER 23, 1998
                            ------------------------
 
TO THE SHAREHOLDERS
OF BANK OF LOS ANGELES:
 
   
    Notice is hereby given that a special meeting ("Special Meeting") of
shareholders of Bank of Los Angeles ("BKLA") will be held in lieu of an annual
meeting at 9601 Wilshire Boulevard, Beverly Hills, California 90210, on
Wednesday, September 23, 1998, at 5:30 p.m. for the following purposes:
    
 
   
    1.  To consider and vote on a proposal to approve the principal terms of the
       proposed merger of BKLA with and into Santa Monica Bank, a wholly-owned
       subsidiary of Western Bancorp ("Western") pursuant to the Agreement and
       Plan of Merger dated as of April 16, 1998, and amended and restated as of
       June 24, 1998 and July 16, 1998 (the "Merger Agreement");
    
 
   
    2.  To set the number of directors at nine, and consider and approve the
       election of nine persons to the BKLA Board of Directors to serve until
       the Merger is consummated or, if the Merger is not consummated, until the
       1999 Annual Meeting of Shareholders at which their successors will be
       elected and duly qualified. The following persons are the nominees:
    
 
<TABLE>
<S>                  <C>                <C>
Adriana M. Boeka     John J. Feldman    James V. Reimann
Mary Anne Chalker    Rickey M. Gelb     Melvin F. Shaw
Roy Doumani          John R. Newhouse   Burton N. Sterman
</TABLE>
 
   
       The bylaws of BKLA currently provide that nominations for election of
       members of the BKLA Board may be made by the BKLA Board or by any
       shareholder of any outstanding class of voting stock of BKLA entitled to
       vote for the election of directors. Notice of intention to make any
       nominations, other than by the BKLA Board, shall be made in writing and
       shall be received by the President and Chief Executive Officer of BKLA no
       more than 60 days prior to any meeting of shareholders called for the
       election of directors, no more than ten days after the date the notice of
       such meeting is sent to shareholders pursuant to Section 2.2 of BKLA's
       bylaws, and no later than the time fixed in the notice of the BKLA
       Meeting for the opening of the Meeting. Notification shall contain the
       following information to the extent known to the notifying shareholder:
       (a) the name and address of each proposed nominee; (b) the principal
       occupation of each proposed nominee; (c) the number of shares of voting
       stock of BKLA owned by each proposed nominee; (d) the name and residence
       address of the notifying shareholder; and (e) the number of shares of
       voting stock of BKLA owned by the notifying shareholder. Nominations made
       without nominee information may be disregarded by the Chairman of the
       Meeting, and the election inspectors shall disregard all votes cast for
       each nominee; and
    
 
   
    3.  To ratify the appointment of Vavrinek, Trine, Day & Co. ("Vavrinek") as
       BKLA's independent public accountants, for the fiscal year ending
       December 31, 1998 should the Merger not be consummated. The appointment
       was recommended by BKLA's audit committee. Vavrinek has been BKLA's
       accountants since 1994 and performed audit services which included the
       examination of consolidated financial statements and services related to
       filings with the Federal Deposit Insurance Corporation. All professional
       services rendered by Vavrinek during 1997 were furnished at customary
       rates and terms. Vavrinek representatives will not be present at the
       Special Meeting.
    
 
   
    4.  To transact such other business as may properly come before the Special
       Meeting or any postponement or adjournment thereof.
    
 
   
    Under the terms of the Merger Agreement, Adriana M. Boeka will be appointed
to the Board of Directors of Western, effective immediately following the
Merger.
    
 
    The Board of Directors has fixed the close of business on July 27, 1998 as
the record date for determination of the shareholders entitled to notice of and
to vote at the Special Meeting or any
<PAGE>
adjournment thereof. Approval of the matters to be voted upon in connection with
the Merger requires the affirmative vote of a majority of the outstanding shares
of common stock, no par value, of BKLA (the "BKLA Common Stock").
 
   
    THE BOARD OF DIRECTORS HAS CONCLUDED THAT THE MERGER IS IN THE BEST
INTERESTS OF BKLA AND ITS SHAREHOLDERS AND UNANIMOUSLY RECOMMENDS THAT YOU VOTE
"FOR" APPROVAL OF THE PRINCIPAL TERMS OF THE MERGER.
    
 
   
    Shareholders may exercise dissenters' rights as provided in the California
General Corporation Code (the "CGCL") and, if all requirements of the CGCL are
met, may receive cash in the amount equal to the fair market value of their
shares of BKLA Common Stock as of April 16, 1998 in lieu of receiving the
Consideration provided in the Merger Agreement by complying with certain
procedures specified by the CGCL. See "THE MERGER--Dissenters' Rights" in the
accompanying Proxy Statement-Prospectus.
    
 
    The accompanying Proxy Statement-Prospectus and the Appendices thereto
(including the Merger Agreement attached as Appendix A thereto and certain of
the Annexes to the Merger Agreement) form a part of this Notice.
 
                                          By Order of the Board of Directors
 
                                                 [LOGO]
 
                                          Beverly A. Dyck,
                                          CORPORATE SECRETARY
 
   
Dated: August 18, 1998
    
 
    YOUR VOTE IS IMPORTANT. THEREFORE, WHETHER OR NOT YOU PLAN TO ATTEND THE
SPECIAL MEETING, YOU SHOULD DATE, SIGN AND RETURN THE ENCLOSED PROXY. IF YOU
ATTEND THE SPECIAL MEETING, YOU WILL BE ENTITLED TO VOTE IN PERSON, IF YOU WISH.
YOU SHOULD NOT FORWARD SHARE CERTIFICATES AT THIS TIME.
<PAGE>
                              BANK OF LOS ANGELES
                                PROXY STATEMENT
                             ---------------------
 
                                WESTERN BANCORP
                                   PROSPECTUS
                             ---------------------
 
   
    This Proxy Statement-Prospectus is being furnished to the shareholders of
the Bank of Los Angeles ("BKLA"), a California corporation, in connection with
the solicitation of proxies by the Board of Directors of BKLA (the "BKLA Board")
from holders of outstanding shares of common stock, no par value ("BKLA Common
Stock"), of BKLA, for use at the special meeting of shareholders of BKLA ("BKLA
Shareholders") in lieu of an annual meeting to be held on September 23, 1998, at
5:30 p.m. (the "Special Meeting" or the "BKLA Meeting") and at any adjournments
and postponements thereof.
    
 
   
    At the BKLA Meeting, the BKLA Shareholders will be asked to consider and
vote upon, among other things, a proposal to approve the principal terms of the
merger (the "Merger") of BKLA with Santa Monica Bank, a California banking
corporation ("SMB") and a wholly-owned subsidiary of Western Bancorp
("Western"), pursuant to an Agreement and Plan of Merger dated as of April 16,
1998, and amended and restated as of June 24, 1998 and July 16, 1998 (the
"Merger Agreement"), by and among Western, Santa Monica Bank and BKLA, which is
attached as Appendix A to this Proxy Statement-Prospectus and is incorporated
herein by reference. Pursuant to the Merger Agreement, BKLA will merge with and
into SMB, with SMB being the surviving bank (the "Surviving Corporation") and
operating under the name "Santa Monica Bank". Upon the Merger becoming
effective, each share of BKLA Common Stock issued and outstanding at the
Effective Time (as defined herein) (other than (a) shares that have not been
voted in favor of the approval of the principal terms of the Merger and with
respect to which Dissenters' Rights (as defined herein) shall have been
perfected in accordance with the California General Corporation Code ("CGCL")
and (b) shares held directly or indirectly by Western, or any of its
subsidiaries, in each case other than in a fiduciary (including custodial or
agency) capacity or as a result of debts previously contracted in good faith),
will be converted automatically into, subject to certain limitations set forth
in the Merger Agreement with respect to proration and fractional shares, 0.4224
shares of common stock, no par value, of Western ("Western Common Stock"). Based
on the closing price per share of Western Common Stock on the BKLA Record Date
(as defined herein), as reported on the Nasdaq National
Market-Registered Trademark- ("Nasdaq"), the per share equivalent price of BKLA
Common Stock based on the 0.4224 conversion number was $17.66. Because the
0.4224 conversion number is fixed pursuant to the Merger Agreement, a change in
the trading price of Western Common Stock before the Effective Time will affect
the implied market value of Western Common Stock to be received in the Merger by
BKLA Shareholders. See "RISK FACTORS--Limited Market for Western Common Stock",
"INFORMATION REGARDING WESTERN" and "SUMMARY--Markets and Market Prices".
    
 
   
    Based upon the 4,911,256 shares of BKLA Common Stock outstanding on the BKLA
Record Date, it is expected that 2,156,468 shares of Western Common Stock would
be issued in the Merger (or, if all of the 322,850 shares of BKLA Common Stock
reserved for issuance upon exercise of employee and director stock options
outstanding on the BKLA Record Date were issued and outstanding at the Effective
Time and if all of the 506,974 shares of BKLA Common Stock reserved for issuance
upon exercise of warrants outstanding on the BKLA Record Date were issued and
outstanding at the Effective Time, it is expected that 2,425,033 shares of
Western Common Stock would be issued in the Merger), assuming (i) no Dissenters'
Rights are perfected by BKLA Shareholders and (ii) no cash is paid in lieu of
fractional shares.
    
 
    In order for any BKLA Shareholder to exercise Dissenters' Rights, a notice
must be sent by such Shareholder and received by BKLA on or before September 23,
1998, the date of the BKLA Meeting, and any such Shareholder must vote against
the approval of the principal terms of the Merger. See "SUMMARY--Dissenters'
Rights" and "THE MERGER--Dissenters' Rights".
 
    Western Common Stock is designated for quotation on Nasdaq under the symbol
"WEBC".
 
   
    SEE "RISK FACTORS" ON PAGE 33 FOR A DISCUSSION OF CERTAIN FACTORS THAT
SHAREHOLDERS SHOULD CONSIDER WITH RESPECT TO THE MERGER.
    
 THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION, NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION, THE FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY
    STATE SECURITIES COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
      PROXY STATEMENT-PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
                           --------------------------
THE SHARES OF WESTERN COMMON STOCK OFFERED HEREBY ARE NOT DEPOSITS AND ARE NOT
   INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION. WESTERN AND BKLA DO
   NOT GUARANTEE THE INVESTMENT VALUE OF THE TRANSACTION DESCRIBED IN THIS
      PROXY STATEMENT-PROSPECTUS. AN INVESTMENT IN WESTERN COMMON STOCK
       MAY LOSE VALUE BEFORE OR AFTER THE EFFECTIVE DATE OF THE MERGER.
                           --------------------------
 
   
           THE SECURITIES ARE SUBJECT TO INVESTMENT RISKS, INCLUDING
                    POSSIBLE LOSS OF THE PRINCIPAL INVESTED.
    
                           --------------------------
 
   
        THE DATE OF THIS PROXY STATEMENT-PROSPECTUS IS AUGUST 18, 1998.
    
 
                                       1
<PAGE>
    NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATION OTHER THAN THOSE CONTAINED IN THIS PROXY STATEMENT-PROSPECTUS IN
CONNECTION WITH THE SOLICITATION OF PROXIES OR THE OFFERING OF SECURITIES MADE
HEREBY, AND IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATION SHOULD NOT BE
RELIED UPON AS HAVING BEEN AUTHORIZED. THIS PROXY STATEMENT-PROSPECTUS DOES NOT
CONSTITUTE AN OFFER TO SELL, OR A SOLICITATION OF AN OFFER TO PURCHASE, THE
SECURITIES OFFERED BY THIS PROXY STATEMENT-PROSPECTUS, OR THE SOLICITATION OF A
PROXY, BY ANY PERSON IN ANY JURISDICTION IN WHICH SUCH AN OFFER OR SOLICITATION
IS NOT AUTHORIZED OR IN WHICH THE PERSON MAKING SUCH OFFER OR SOLICITATION IS
NOT QUALIFIED TO DO SO OR TO ANY PERSON TO WHOM IT IS UNLAWFUL TO MAKE SUCH AN
OFFER, OR SOLICITATION OF AN OFFER, OR PROXY SOLICITATION. NEITHER DELIVERY OF
THIS PROXY STATEMENT-PROSPECTUS NOR ANY DISTRIBUTION OF THE SECURITIES BEING
OFFERED PURSUANT TO THIS PROXY STATEMENT-PROSPECTUS SHALL, UNDER ANY
CIRCUMSTANCES, CREATE AN IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE
INFORMATION SET FORTH HEREIN SINCE THE DATE OF THIS PROXY STATEMENT-PROSPECTUS.
 
                             AVAILABLE INFORMATION
 
   
    Each of Western and BKLA is subject to the informational requirements of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"). In accordance
therewith, Western files reports, proxy statements and other information with
the Securities and Exchange Commission (the "Commission") and BKLA files
reports, proxy statements and other information with the Federal Deposit
Insurance Corporation (the "FDIC"). The reports, proxy statements and other
information filed by BKLA with the FDIC may be inspected and copied at the
offices of the FDIC, Registration, Disclosure and Securities Operations Unit,
550 17th Street N.W., Washington, D.C. 20429, Room F-6043. The voice phone
numbers are 202/898-8911 and 202/898-8913. The facsimile number is 202/898-3909.
The reports, proxy statements and other information filed by Western with the
Commission may be inspected and copied at the public reference facilities of the
Commission located at 450 Fifth Street, N.W., Washington, D.C. 20549 and at the
Commission's regional offices at 7 World Trade Center, New York, New York 10048,
and Citicorp Center, 500 West Madison Street, Chicago, Illinois 60661, at
prescribed rates. Such material may also be accessed electronically by means of
the Commission's home page on the Internet at http://www.sec.gov. Shares of
Western Common Stock are designated for quotation on Nasdaq. Material filed by
Western can be inspected at the offices of the National Association of
Securities Dealers, Inc., Reports Section, 1735 K Street, N.W., Washington, D.C.
20006. The reports, proxy statements and other information filed by BKLA with
the FDIC during the 12 calendar months immediately preceding the filing of
Western's Registration Statement (as defined below) have been filed with the
Commission as part of the Current Reports on Form 8-K filed by Western on June
25, 1998, and may be inspected and copied at the public reference facilities of
the Commission and at the Commission's regional offices at the addresses listed
above, and accessed electronically at the Commission's home page listed above.
    
 
    Western has filed with the Commission a registration statement on Form S-4
(including exhibits thereto, the "Registration Statement") pursuant to the
Securities Act of 1933, as amended (the "Securities Act"), covering the shares
of Western Common Stock issuable in the Merger. This Proxy Statement-Prospectus
does not contain all the information set forth in the Registration Statement.
Such additional information may be obtained from the Commission's principal
office in Washington, D.C. Statements contained in this Proxy
Statement-Prospectus as to the contents of any contract or other document
referred to herein are not necessarily complete, and in each instance reference
is made to the copy of such contract or other document filed as an exhibit to
the Registration Statement, each such statement being qualified in all respects
by such reference.
 
   
    This Proxy Statement-Prospectus constitutes the proxy statement of BKLA
relating to the solicitation of proxies for its use at the BKLA Meeting as well
as the Prospectus filed as part of the Registration Statement. This Proxy
Statement-Prospectus and the related proxy and other materials are first being
provided to the shareholders of BKLA on or about August 17, 1998. BKLA
Shareholders may request a copy of BKLA's annual report from Beverly A. Dyck,
the Secretary of BKLA, by phone on (310) 843-1455.
    
 
                                       2
<PAGE>
               INCORPORATION OF CERTAIN INFORMATION BY REFERENCE
 
   
    THIS PROXY STATEMENT-PROSPECTUS INCORPORATES BY REFERENCE DOCUMENTS NOT
INCLUDED HEREIN. DOCUMENTS RELATING TO WESTERN, EXCLUDING EXHIBITS UNLESS
SPECIFICALLY INCORPORATED HEREIN, ARE AVAILABLE WITHOUT CHARGE UPON REQUEST TO
JULIUS G. CHRISTENSEN, EXECUTIVE VICE PRESIDENT, GENERAL COUNSEL AND SECRETARY,
WESTERN BANCORP, 4100 NEWPORT PLACE, SUITE 900, NEWPORT BEACH, CALIFORNIA 92660.
TELEPHONE REQUESTS MAY BE DIRECTED TO JULIUS G. CHRISTENSEN, AT (949) 863-2459.
DOCUMENTS RELATING TO BKLA, EXCLUDING EXHIBITS UNLESS SPECIFICALLY INCORPORATED
HEREIN, ARE AVAILABLE WITHOUT CHARGE UPON REQUEST TO BEVERLY A. DYCK, VICE
PRESIDENT AND CORPORATE SECRETARY, BANK OF LOS ANGELES, 8901 SANTA MONICA
BOULEVARD, WEST HOLLYWOOD, CALIFORNIA 90069. TELEPHONE REQUESTS MAY BE DIRECTED
TO BEVERLY A. DYCK, AT (310) 843-1455. IN ORDER TO ENSURE TIMELY DELIVERY OF
DOCUMENTS, ANY REQUESTS SHOULD BE MADE BY SEPTEMBER 1, 1998.
    
 
    The following documents filed with the Commission by Western are
incorporated herein by reference:
 
    (a) Western's Annual Report on Form 10-K for the year ended December 31,
    1997 (the "Western Annual Report");
 
   
    (b) Western's Quarterly Reports on Form 10-Q for the quarters ended March
    31, 1998 and June 30, 1998;
    
 
   
    (c) Western's Current Reports on Form 8-K dated February 11, 1998, April 30,
    1998, June 18, 1998 and August 6, 1998 and on Form 8-K/A dated April 9,
    1998.
    
 
    (d) The description of Western's Common Stock contained in Western's
    Registration Statement on Form 10 (File No. 2-85442).
 
   
    (e) The following documents filed with the FDIC by BKLA, which have been
    filed as part of the Current Reports on Forms 8-K filed by Western on June
    24, 1998 and August 7, 1998:
    
 
        (i) BKLA's Annual Report on Form 10-K for the fiscal year ended December
        31, 1997 (the "BKLA Annual Report");
 
        (ii) BKLA's Current Reports on Form 8-K, dated April 30, 1998 and May 6,
        1998; and
 
   
        (iii) BKLA's Quarterly Reports on Form 10-Q for the quarters ended March
        31, 1998 and June 30, 1998.
    
 
    Such incorporation by reference shall not be deemed to incorporate by
reference the information referred to in Item 402(a)(8) of Regulation S-K.
 
    All documents and reports filed by Western pursuant to Section 13(a), 13(c),
14 or 15(d) of the Exchange Act subsequent to the date hereof and prior to the
BKLA Meeting shall be deemed to be incorporated herein by reference and to be a
part hereof from the date of such filing and all documents and reports filed by
BKLA pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act
subsequent to the date hereof and prior to the BKLA Meeting shall be filed by
Western with the Commission and shall be deemed to be incorporated by reference
and to be a part hereof from the date of such filing with the Commission and any
statement contained herein or in a document incorporated or deemed to be
incorporated herein by reference shall be deemed to be modified or superseded
for purposes hereof to the extent that a statement contained herein or in any
other subsequently filed document that also is, or is deemed to be, incorporated
herein by reference, modifies or supersedes such statement. Any such statement
so modified or superseded shall not be deemed to constitute a part hereof,
except as so modified or superseded.
 
                                       3
<PAGE>
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
AVAILABLE INFORMATION.....................................................     2
 
INCORPORATION OF CERTAIN INFORMATION BY REFERENCE.........................     3
 
TABLE OF CONTENTS.........................................................     4
 
TABLE OF DEFINED TERMS....................................................     7
 
COMMON QUESTIONS AND ANSWERS ABOUT THE MERGER.............................    10
 
SUMMARY...................................................................    12
  The Companies...........................................................    12
  Additional Information..................................................    13
  The Merger..............................................................    13
  The BKLA Meeting........................................................    14
  Votes Required..........................................................    14
  Revocability of Proxies.................................................    15
  Recommendations of the Boards of Directors..............................    15
  Opinion of Wedbush......................................................    15
  Effective Time..........................................................    15
  Conditions to the Merger................................................    16
  Waiver and Amendment....................................................    16
  Termination.............................................................    16
  Stock Option Agreement..................................................    17
  Regulatory Approvals....................................................    17
  Operations and Management After the Merger..............................    17
  Interests of Certain Persons in the Merger..............................    18
  Certain Federal Income Tax Consequences.................................    18
  Accounting Treatment....................................................    19
  Dissenters' Rights......................................................    19
  Risk Factors............................................................    19
  Proposed Peninsula Acquisition..........................................    19
  Markets and Market Prices...............................................    19
  Summary Historical Financial Data.......................................    22
  Summary Unaudited Pro Forma Combined Financial Data.....................    26
  Selected Historical and Pro Forma per Share Data........................    28
  Summary Financial Data Regarding Peninsula..............................    29
 
RISK FACTORS..............................................................    33
  Forward-Looking Statements May Not Prove Accurate.......................    33
  Competition.............................................................    33
  Ability to Integrate the Operations of Western and BKLA; Rapid Growth...    33
  General Business Risk...................................................    34
  Concentration of Operations; Recessionary Environments; Decline in Real
    Estate Values.........................................................    34
  Interest Rate Risk......................................................    35
  Shares Eligible for Future Sale; Dilution...............................    35
  Regulation..............................................................    36
  Limited Market for Western Common Stock.................................    36
  Year 2000 Risks and Preparedness........................................    36
 
INFORMATION REGARDING WESTERN.............................................    38
  Business of Western.....................................................    38
</TABLE>
    
 
                                       4
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  Quarterly Dividend......................................................    38
  Incorporation of Certain Information By Reference.......................    38
 
INFORMATION REGARDING BKLA................................................    39
  Business of BKLA........................................................    39
  Incorporation of Certain Information by Reference.......................    39
 
UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL DATA.....................    40
 
NOTES TO UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL DATA............    48
 
WESTERN--BKLA--PENINSULA UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL
  DATA....................................................................    50
 
NOTES TO WESTERN--BKLA--PENINSULA UNAUDITED PRO FORMA COMBINED CONDENSED
  FINANCIAL DATA..........................................................    58
 
THE SPECIAL MEETING OF BKLA SHAREHOLDERS..................................    59
  General.................................................................    59
  Matters To Be Considered at the BKLA Special Meeting....................    59
  The BKLA Record Date....................................................    60
  Votes Required and Voting of Proxies....................................    60
  Solicitation of Proxies.................................................    61
  Revocability of Proxies.................................................    61
  Security Ownership of Certain Beneficial Owners and Management of
    BKLA..................................................................    61
  Dissenters' Rights......................................................    63
  Election of BKLA Directors..............................................    64
  Certain Committees of the BKLA Board....................................    65
  BKLA Director Compensation..............................................    65
  BKLA Executive Officers.................................................    66
  Compensation of BKLA Executive Officers.................................    66
  BKLA Aggregated Option Exercise and Option Values as of December 31,
    1997..................................................................    67
  BKLA Options Granted for the Year Ending December 31, 1997..............    67
  Certain BKLA Transactions...............................................    67
  BKLA Compensation/Stock Option Committee Report.........................    68
  BKLA Performance Graph..................................................    68
 
THE MERGER................................................................    70
  Background and Reasons for the Merger...................................    70
  Structure of the Merger.................................................    72
  Reasons for the Merger; Recommendations of the BKLA Board of
    Directors.............................................................    73
  Opinion of Wedbush......................................................    73
  Wedbush Fee.............................................................    79
  Certain Federal Income Tax Consequences.................................    79
  Regulatory Approvals....................................................    80
  Resale of Western Common Stock..........................................    82
  Certain Effects of the Merger...........................................    82
  Interests of Certain Persons in the Merger..............................    83
  Submission of Shareholders' Proposals for BKLA's 1999 Annual Meeting....    85
  Dissenters' Rights......................................................    85
  Accounting Treatment....................................................    87
 
THE MERGER AGREEMENT......................................................    88
  The Merger..............................................................    88
</TABLE>
    
 
   
                                       5
    
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  Effective Time and Effective Date.......................................    88
  Exchange of Stock Certificates; Dividends...............................    89
  No Fractional Shares....................................................    89
  Conduct of the Business of BKLA and Western Prior to the Merger.........    89
  Representations and Warranties..........................................    90
  Certain Covenants.......................................................    91
  Conditions..............................................................    93
  Termination.............................................................    94
  Termination Payment.....................................................    94
  Expenses................................................................    94
 
THE STOCK OPTION AGREEMENT................................................    95
  General.................................................................    95
  The Stock Option........................................................    95
  Termination.............................................................    96
 
THE SHAREHOLDER AGREEMENTS................................................    96
 
COMPARISON OF SHAREHOLDER RIGHTS..........................................    97
  Comparison of Corporate Structure.......................................    97
  Dividends and Dividend Policy...........................................    97
  Number of Directors.....................................................    98
  Indemnification of Directors and Officers...............................    98
 
VALIDITY OF WESTERN COMMON STOCK..........................................    98
 
EXPERTS...................................................................    98
</TABLE>
    
 
                               LIST OF APPENDICES
 
   
Appendix A-- Agreement and Plan of Merger, dated as of April 16, 1998, and
            amended and restated as of June 24, 1998 and July 16, 1998 by and
            among Western, SMB and BKLA.
    
 
Appendix B--Fairness Opinion of Wedbush Morgan Securities.
 
Appendix C--Chapter 13 of the CGCL.
 
                                       6
<PAGE>
                             TABLE OF DEFINED TERMS
 
   
<TABLE>
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Acquisition Premium.......................................................    77
Acquisition Proposal......................................................    91
Acquisition Transaction...................................................    96
AWB.......................................................................    13
Beneficial Owner..........................................................    63
BHCA......................................................................    12
BKLA......................................................................     1
BKLA Affiliates...........................................................    82
BKLA Annual Report........................................................     3
BKLA Board................................................................     1
BKLA Common Stock.........................................................     1
BKLA Management...........................................................    17
BKLA Meeting..............................................................     1
BKLA Record Date..........................................................    14
BKLA Shareholders.........................................................     1
BKLA Stock Option.........................................................    48
BKLA Subsidiary...........................................................    95
BKLA Warrant..............................................................    48
BKX Index Percentage......................................................    94
BMA.......................................................................    81
Book Value Multiple.......................................................    77
Cash Net Income...........................................................    77
CCB.......................................................................    12
CCB Merger................................................................    12
CGCL......................................................................     1
CNB.......................................................................    13
Code......................................................................    18
Commission................................................................     2
Comparable Banks..........................................................    77
Comparison Merger Transactions............................................    76
Consideration.............................................................    13
Conversion Number.........................................................    14
Costs.....................................................................    91
CRA.......................................................................    81
Demand....................................................................    85
Diluted EPS...............................................................    76
Dissenters' Rights........................................................    19
Dissenting Shareholder....................................................    86
Dissenting Shares.........................................................    86
Dividendable Net Income...................................................    77
Effective Date............................................................    88
Effective Time............................................................    88
Equivalent Per Share Price................................................    20
Exchange Act..............................................................     2
Exchange Agent............................................................    89
FDIC......................................................................     2
Federal Reserve Board.....................................................    16
FIP.......................................................................    36
</TABLE>
    
 
   
                                       7
    
<PAGE>
   
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FIRREA....................................................................    83
GAAP......................................................................    75
Grantee...................................................................    17
Holding Period............................................................    80
Indemnified Parties.......................................................    91
IRS.......................................................................    79
Issuer....................................................................    17
Letter of Transmittal.....................................................    89
LTM Multiple..............................................................    76
Maximum Amount............................................................    92
Merger....................................................................     1
Merger Agreement..........................................................     1
Merger Sub................................................................    19
Nasdaq....................................................................     1
NBSC......................................................................    12
New Certificates..........................................................    89
Old Certificates..........................................................    89
Option....................................................................    17
Party Shareholders........................................................    96
Peninsula.................................................................    19
Peninsula Acquisition.....................................................    19
Peninsula Common Stock....................................................    19
Peninsula Merger Agreement................................................    19
Pooling Condition.........................................................    87
Preliminary Purchase Event................................................    95
Purchase Event............................................................    95
Registration Rights.......................................................    96
Registration Statement....................................................     2
Reorganization............................................................    18
Replacement Shares........................................................    48
Replacement Warrant.......................................................    48
SCB.......................................................................    12
SCB Merger................................................................    12
Securities Act............................................................     2
Shareholder Agreements....................................................    15
SMB.......................................................................     1
SMB Acquisition...........................................................    12
SMB Board.................................................................    13
Special Meeting...........................................................     1
Spread....................................................................    48
State Commissioner........................................................    13
Stock Option Agreement....................................................    17
Surviving Corporation.....................................................     1
Tangible Book Value Multiple..............................................    77
Tax Opinions..............................................................    18
Ten Day Average Price.....................................................    94
Ten Day Period............................................................    94
Vavrinek..................................................................    16
Wedbush...................................................................    15
Wedbush Agreement.........................................................    73
</TABLE>
    
 
   
                                       8
    
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Wedbush Opinion...........................................................    73
Wedbush Reconfirming Opinion..............................................    73
Western...................................................................     1
Western Annual Report.....................................................     3
Western Board.............................................................    13
Western Common Stock......................................................     1
Western Common Stock Price Percentage.....................................    94
Western Management........................................................    22
Western Subsidiary........................................................    95
WTB.......................................................................    13
Year 2000 Plan............................................................    37
</TABLE>
    
 
                                       9
<PAGE>
   
                 COMMON QUESTIONS AND ANSWERS ABOUT THE MERGER
    
 
   
    THIS QUESTION AND ANSWER SUMMARY HIGHLIGHTS SELECTED INFORMATION FROM THIS
DOCUMENT AND MAY NOT CONTAIN ALL OR ANY INFORMATION THAT IS IMPORTANT TO YOU.
FOR A MORE COMPLETE UNDERSTANDING OF THE MERGER AND FOR A MORE COMPLETE
DESCRIPTION OF THE LEGAL TERMS OF THE MERGER, YOU SHOULD READ THIS ENTIRE
DOCUMENT CAREFULLY, AS WELL AS ANY ADDITIONAL DOCUMENTS TO WHICH WE REFER IN
THIS DOCUMENT.
    
 
   
Q: WHO ARE THE PARTIES TO THIS MERGER?
    
 
   
A: Bank of Los Angeles, which we sometimes call "BKLA", will merge into Santa
   Monica Bank. The combined bank name will be Santa Monica Bank, which we
   sometimes refer to as "SMB". Santa Monica Bank is owned by Western Bancorp,
   which we sometimes call "Western".
    
 
   
Q: WHY HAS BKLA PROPOSED TO MERGE INTO SMB?
    
 
   
A: The Board of Directors of BKLA recommends that you vote for this merger
   because the Board members believe that it:
    
 
   
    - allows the combined company to compete more effectively with the larger
      financial institutions that currently exist or will likely result from the
      various consolidations and mergers in the industry nationwide and locally;
    
 
   
    - provides shareholders with potential benefits of a larger organization
      with greater resources, increased operating efficiencies, the ability to
      utilize a trust department, increased lending limits and a stronger market
      position in western Los Angeles County; and
    
 
   
    - offers increased long-term value, stability and liquidity to current BKLA
      shareholders by converting their shares into shares of common stock of
      Western.
    
 
   
      More information regarding the BKLA Board's recommendations is available
      on page 73.
    
 
   
Q: HOW WILL I BE AFFECTED IN THE MERGER?
    
 
   
A: Each shareholder of BKLA will have each of their shares converted into 0.4224
   shares of Western common stock. Any remaining fractional share will be
   converted into cash. For example, if a BKLA shareholder owns 100 shares of
   BKLA stock, after the merger, the shareholder will own 42 shares of Western
   common stock and will receive a check for the market value of a 0.24 share of
   Western common stock which on August 5, 1998, was approximately $9.45.
    
 
   
   In the proposed merger, current BKLA shareholders will receive shares
   representing ownership of between 12.1 - 13.0% of Western after the proposed
   merger, and the shares held by Western's current shareholders will represent
   ownership of approximately 87.0 - 87.9% of Western after the proposed merger
   is completed depending on whether outstanding options and warrants are
   exercised prior to the merger. Each share owned by existing shareholders of
   BKLA will represent an ownership interest in a much larger company.
    
 
   
Q: WHAT ARE THE TAX CONSEQUENCES OF THE MERGER TO ME?
    
 
   
A: We expect that the exchange of shares will be a tax-free transaction for
   federal income tax purposes for BKLA shareholders. However, BKLA shareholders
   will have to pay taxes on cash received for fractional shares. To review the
   tax consequences to shareholders in greater detail, see page 80. The tax
   consequences of the merger to you will depend on your own situation. You
   should consult your tax advisors for a full understanding of the tax
   consequences of the merger to you.
    
 
   
Q: WHY IS BKLA MERGING INTO SMB, WHICH IS A SUBSIDIARY OF WESTERN?
    
 
   
A: The merger was structured so that Western can remain a bank holding company
   under the Bank Holding Company Act. The merger structure simplifies certain
   aspects of the regulatory process relating to the merger and results in
   certain funding advantages.
    
 
                                       10
<PAGE>
   
Q: WILL BKLA BE ALLOWED TO HAVE A DIRECTOR ON THE WESTERN BOARD OF DIRECTORS?
    
 
   
A: Yes. Adriana M. Boeka, who is currently the Chairman of the Board of
   Directors for BKLA, will be appointed to the Board of Directors of Western,
   effective immediately following the merger.
    
 
   
Q: WHAT REGULATORY APPROVALS ARE REQUIRED?
    
 
   
A: The merger must be approved by the Federal Deposit Insurance Corporation as
   well as the California Department of Financial Institutions. Further
   information on the required regulatory approvals can be found on pages 80 and
   82.
    
 
   
Q: WHAT RISKS SHOULD I CONSIDER?
    
 
   
A: You should review the "RISK FACTORS" section on pages 33 through 37.
    
 
   
Q: WHEN WILL THE MERGER TAKE EFFECT?
    
 
   
A: We expect the merger to become effective in late September or early October
   of 1998.
    
 
   
Q: WHAT DO I NEED TO DO NOW?
    
 
   
A: Please read this document carefully and then mail your signed proxy card
   approving or disapproving the items listed on the proxy card as soon as
   possible so that your shares may be represented at the special meeting of
   BKLA shareholders. The special meeting will take place on September 23, 1998.
    
 
   
Q: CAN I CHANGE MY VOTE AFTER I HAVE MAILED IN MY SIGNED PROXY CARD?
    
 
   
A: Yes. After you have mailed your signed proxy card you can change your vote at
   any time before we vote your proxy at the special meeting. You can do so in
   one of three ways prior to the special meeting. First, you can send a written
   notice stating that you would like to revoke your proxy to the Secretary of
   BKLA at the address given below. Second, you can complete a new proxy card
   and send it to the Secretary of BKLA at the address given below. Third, you
   can attend the special meeting and vote in person. You should send any
   written notice or new proxy card to the Secretary of BKLA at 8901 Santa
   Monica Boulevard, West Hollywood, California 90069. You may request a new
   proxy card by calling Beverly A. Dyck, the Secretary of BKLA, on (310)
   843-1455.
    
 
   
Q: WHAT IF I DO NOT APPROVE OF THE PROPOSED MERGER AND DO NOT WANT MY SHARES
   CONVERTED IF THE MERGER IS APPROVED?
    
 
   
A: You may obtain dissenting shareholders rights by complying with the
   requirements of Chapter 13 of the California General Corporation Code. If all
   of the requirements of Chapter 13 are met and the merger is approved, you
   will receive cash for the fair market value of your shares in lieu of Western
   common stock. See pages 85 through 87 for details.
    
 
   
Q: SHOULD I SEND IN MY STOCK CERTIFICATES NOW?
    
 
   
A: No. After the merger is completed we will send you written instructions for
   exchanging your BKLA stock certificates for Western common stock
   certificates.
    
 
   
Q: WHERE CAN I FIND MORE INFORMATION?
    
 
   
A: You may obtain more information in this document and in other sources which
   are listed under "AVAILABLE INFORMATION" on page 2.
    
 
                                       11
<PAGE>
                                    SUMMARY
 
    THE FOLLOWING SUMMARY IS NOT INTENDED TO BE COMPLETE AND IS QUALIFIED IN ALL
RESPECTS BY THE MORE DETAILED INFORMATION INCLUDED IN THIS PROXY
STATEMENT-PROSPECTUS, THE APPENDICES HERETO AND THE DOCUMENTS INCORPORATED
HEREIN BY REFERENCE. SHAREHOLDERS ARE URGED TO READ CAREFULLY THIS PROXY
STATEMENT-PROSPECTUS, INCLUDING THE APPENDICES HERETO AND THE DOCUMENTS
INCORPORATED HEREIN BY REFERENCE, IN THEIR ENTIRETY.
 
    ALL INFORMATION CONCERNING WESTERN, SOUTHERN CALIFORNIA BANK ("SCB") AND
SANTA MONICA BANK INCLUDED IN THIS PROXY STATEMENT-PROSPECTUS, THE APPENDICES
HERETO AND THE DOCUMENTS INCORPORATED HEREIN BY REFERENCE HAS BEEN FURNISHED BY
WESTERN, AND ALL INFORMATION CONCERNING BKLA INCLUDED IN THIS PROXY
STATEMENT-PROSPECTUS, THE APPENDICES HERETO AND THE DOCUMENTS INCORPORATED
HEREIN BY REFERENCE HAS BEEN FURNISHED BY BKLA. UNLESS THE CONTEXT OTHERWISE
REQUIRES, REFERENCES TO "WESTERN" HEREIN SHALL BE TO WESTERN AND ITS
SUBSIDIARIES, INCLUDING SCB AND SMB.
 
    THIS PROXY STATEMENT-PROSPECTUS INCLUDES "FORWARD-LOOKING STATEMENTS" WITHIN
THE MEANING OF SECTION 27A OF THE SECURITIES ACT AND SECTION 21E OF THE EXCHANGE
ACT. ALTHOUGH EACH OF WESTERN AND BKLA BELIEVES THAT ITS PLANS, INTENTIONS AND
EXPECTATIONS REFLECTED IN SUCH FORWARD-LOOKING STATEMENTS ARE REASONABLE,
NEITHER CAN GIVE ANY ASSURANCE THAT SUCH PLANS, INTENTIONS OR EXPECTATIONS WILL
BE ACHIEVED. IMPORTANT FACTORS THAT COULD CAUSE ACTUAL RESULTS TO DIFFER
MATERIALLY FROM WESTERN'S AND BKLA'S FORWARD-LOOKING STATEMENTS ARE SET FORTH
BELOW AND ELSEWHERE IN THIS PROXY STATEMENT-PROSPECTUS. FURTHERMORE, WESTERN AND
BKLA DO NOT INTEND TO UPDATE OR REVISE THE FORWARD-LOOKING STATEMENTS TO REFLECT
EVENTS OR CIRCUMSTANCES AFTER THE DATE HEREOF OR TO REFLECT THE OCCURRENCE OF
UNANTICIPATED EVENTS. SHAREHOLDERS ARE CAUTIONED NOT TO PLACE UNDUE RELIANCE ON
ANY OF THE FORWARD-LOOKING STATEMENTS INCLUDED HEREIN. ALL FORWARD-LOOKING
STATEMENTS ATTRIBUTABLE TO WESTERN, BKLA OR PERSONS ACTING ON EITHER OF THEIR
BEHALVES ARE QUALIFIED IN THEIR ENTIRETY BY THE CAUTIONARY STATEMENTS SET FORTH
HEREIN. SEE "RISK FACTORS--FORWARD-LOOKING STATEMENTS MAY NOT PROVE ACCURATE".
 
THE COMPANIES
 
  WESTERN
 
    Western is a bank holding company registered under the Bank Holding Company
Act of 1956, as amended (the "BHCA"), and its principal business is to serve as
a holding company for its banking subsidiaries, SCB and SMB. Western was
organized on May 20, 1983 as a California corporation and commenced operation as
a bank holding company on June 18, 1984. Western Bank was acquired by Western on
September 30, 1996. On June 4, 1997, Western consummated its merger (the "CCB
Merger") with California Commercial Bankshares ("CCB") pursuant to which CCB
merged with and into Western. Also on June 4, 1997, Monarch Bank, a wholly-owned
subsidiary of Western prior to the CCB Merger, merged with and into National
Bank of Southern California ("NBSC"), a wholly-owned subsidiary of CCB prior to
the CCB Merger. The banking operations of NBSC and Monarch Bank were combined in
June 1997. On October 10, 1997, Western consummated its merger with SC Bancorp
(the "SCB Merger") pursuant to which SC Bancorp merged with and into Western. On
December 15, 1997, Western merged NBSC with and into SCB, a wholly-owned
subsidiary of SC Bancorp prior to the SCB Merger, with SCB being the surviving
bank. The operations of NBSC and SCB were combined in March 1998. On January 27,
1998, Western acquired Santa Monica Bank through the merger of Santa Monica Bank
with and into Western Bank (the "SMB Acquisition"). As part of the SMB
Acquisition, the name of Western Bank was changed to "Santa Monica Bank". As
used hereafter, "SMB" refers to the surviving entity in the merger of Santa
Monica Bank with and into Western Bank.
 
   
    Santa Monica Bank's primary market area is the western part of Los Angeles
County. As of June 30, 1998 Santa Monica Bank had thirteen branch offices,
including branch offices in Santa Monica, Westwood, Malibu, Pacific Palisades,
Marina Del Rey, Beverly Hills, Century City and Encino. SCB's primary market
area includes southern Los Angeles County, Orange County and San Diego County.
As of June 30, 1998 SCB had six branch offices in southern Los Angeles County,
nine branch offices throughout Orange County and one in northern San Diego
County. Santa Monica Bank and SCB offer a broad range of
    
 
                                       12
<PAGE>
banking products and services, including many types of business and personal
savings and checking accounts and other consumer banking services.
 
    Western's principal executive offices are located at 4100 Newport Place,
Suite 900, Newport Beach, California 92660, and its telephone number is (949)
863-2444.
 
  BKLA
 
   
    BKLA was organized on May 8, 1981 as a California corporation and commenced
operations pursuant to a charter issued by the predecessor to the California
Commissioner of Financial Institutions (the "State Commissioner"), on May 6,
1982. On November 15, 1995, BKLA acquired World Trade Bank ("WTB"), with total
assets of approximately $42,487,000 and one banking office. Effective April 1,
1997, BKLA consummated a merger with American West Bank ("AWB"), with
approximately $67,291,000 in assets and two banking offices with BKLA being the
surviving bank. On December 31, 1997, BKLA consummated its merger with Culver
National Bank ("CNB"), a national banking corporation with approximately
$60,277,000 in total assets and one branch office, with BKLA being the surviving
bank.
    
 
    BKLA is a full-service community bank which engages in general commercial
banking in Los Angeles County, California. BKLA's main office and its executive
offices are located in West Hollywood, California. As of June 15, 1998 BKLA had
six branch offices in the cities of Beverly Hills, West Hollywood, Encino,
Culver City and Glendale. Services include those traditionally offered by
commercial banks, such as checking and saving accounts and commercial and real
estate loans, and, for its business customers, personal, home improvement,
automobile and other installment loans. The vast majority of BKLA's loans are
direct loans made to individuals, professionals, real estate developers, and
small and medium sized businesses within BKLA's marketing area.
 
    BKLA's principal executive offices are located at 8901 Santa Monica
Boulevard, West Hollywood, California 90069 and its telephone number is (310)
550-8900.
 
ADDITIONAL INFORMATION
 
    For additional information regarding the business of Western and BKLA, see
"AVAILABLE INFORMATION", "INCORPORATION OF CERTAIN INFORMATION BY REFERENCE",
"UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL DATA", "INFORMATION REGARDING
BKLA" and "INFORMATION REGARDING WESTERN".
 
THE MERGER
 
   
    On April 16, 1998 the BKLA Board, on April 7, 1998 the Board of Directors of
Western (the "Western Board"), and on April 16, 1998 the Board of Directors of
Santa Monica Bank (the "SMB Board"), each respectively approved the Merger
Agreement, and the Merger Agreement was executed and delivered on April 16,
1998, and amended and restated on June 24, 1998 and July 16, 1998, by Western,
Santa Monica Bank and BKLA. The Merger Agreement provides for the merger of BKLA
with and into Santa Monica Bank with Santa Monica Bank being the surviving bank.
In connection with the Merger, each share of BKLA Common Stock issued and
outstanding at the Effective Time (other than (a) shares that have not been
voted in favor of approval of the principal terms of the Merger and with respect
to which Dissenters' Rights have been perfected in accordance with the CGCL and
(b) shares held by any of BKLA's subsidiaries or by Western or any of its
subsidiaries, in each case other than in a fiduciary (including custodial or
agency) capacity or as a result of debts previously contracted in good faith)
will be converted automatically into, subject to the limitations set forth in
the Merger Agreement with respect to proration and fractional shares, 0.4224
shares of Western Common Stock (the "Consideration"). Each share of Western
Common Stock outstanding immediately prior to the Effective Time will remain
    
 
                                       13
<PAGE>
outstanding after the Merger as one share of Western Common Stock. See "THE
MERGER--Background and Reasons for the Merger", "--Reasons for the Merger;
Recommendations of the BKLA Board of Directors" and "--Dissenters' Rights".
 
   
    The Merger Agreement provides that, if the BKLA Shareholders approve the
principal terms of the Merger, and subject to receipt of regulatory approvals
and other customary closing conditions as more fully set forth below, then BKLA
will merge into Santa Monica Bank, with Santa Monica Bank being the Surviving
Corporation. At the Effective Time, shares of BKLA Common Stock will be
converted into 0.4224 shares (the "Conversion Number") of Western Common Stock,
subject to the limitations described above and elsewhere herein. See "THE
MERGER--Certain Federal Income Tax Consequences" and "THE MERGER AGREEMENT--The
Merger".
    
 
   
    All BKLA Stock Options (as defined herein), unless otherwise exercised
pursuant to BKLA's stock option plan, shall be converted into the right to
receive for each share of BKLA Common Stock otherwise issuable upon exercise
thereof, a number of shares of Western Common Stock equal to the quotient
obtained by dividing the Spread (as defined herein) by $42.61. At the Effective
Time, each BKLA Warrant (as defined herein), shall be converted into a warrant
to acquire, on the same terms and conditions as were applicable under such BKLA
warrant agreement, the number of shares of Western Common Stock equal to (a) the
number of shares of BKLA Common Stock subject to the BKLA Warrant, multiplied by
(b) the Conversion Number (such product rounded down to the nearest whole
number), at an exercise price per share (rounded up to the nearest whole cent)
equal to (y) the aggregate exercise price for the shares of BKLA Common Stock
which were purchasable pursuant to such BKLA Warrant divided by (z) the number
of full shares of Western Common Stock subject to such Replacement Warrants (as
defined herein). See "THE MERGER--Structure of the Merger".
    
 
THE BKLA MEETING
 
   
    The BKLA Meeting to consider and vote on, among other things, approval of
the principal terms of the Merger will be held on Wednesday, September 23, 1998
at 5:30 p.m. local time, at the Beverly Hills Branch of BKLA, 9601 Wilshire
Boulevard, Beverly Hills, California 90210. Only holders of record of BKLA
Common Stock at the close of business on July 27, 1998 (the "BKLA Record Date")
will be entitled to vote at the BKLA Meeting. At such date, there were
outstanding and entitled to vote 4,911,256 shares of BKLA Common Stock. Each
share of BKLA Common Stock is entitled to one vote for each share held of record
upon each matter properly submitted at the BKLA Meeting except that under
certain circumstances, BKLA shareholders will have cumulative voting rights in
connection with the election of directors as described more fully below in "THE
SPECIAL MEETING OF BKLA SHAREHOLDERS--Votes Required and Voting of Proxies".
    
 
    For additional information relating to the BKLA Meeting, see "THE SPECIAL
MEETING OF BKLA SHAREHOLDERS".
 
VOTES REQUIRED
 
    Approval of the matters to be voted upon in connection with the Merger by
the BKLA Shareholders requires the affirmative vote of the holders of a majority
of the outstanding shares of BKLA Common Stock entitled to vote. As a result,
the failure to vote in person or by proxy on any such proposal at the BKLA
Meeting or abstaining on any proposal has the same effect as voting against the
applicable proposal. In the election of directors at the BKLA Meeting, the
candidates receiving the highest number of affirmative votes of the shares
entitled to vote for them up to the number of directors to be elected by such
shares will be elected, assuming a quorum is present. In addition, BKLA
Shareholders will have cumulative voting rights with respect to the election of
directors if certain conditions are met. See "THE SPECIAL MEETING OF BKLA
SHAREHOLDERS--Votes Required and Voting of Proxies".
 
   
    As of the BKLA Record Date, BKLA's directors and officers beneficially held,
in the aggregate, the ability to direct the voting with respect to approximately
14.3% of the outstanding BKLA Common Stock entitled to vote at the BKLA Meeting.
BKLA Shareholders (who are also directors, or the estate of a
    
 
                                       14
<PAGE>
   
former director, of BKLA) holding approximately 18.0% of BKLA Common Stock
outstanding on the BKLA Record Date have entered into agreements (the
"Shareholder Agreements") pursuant to which they have agreed, among other
things, to vote "FOR" the adoption and approval of the Merger Agreement and the
Merger. However, the shareholder/directors are bound by the Shareholder
Agreements only in their capacity as shareholders. As directors, they are bound
by their fiduciary duties to act in the best interest of BKLA when they decide
whether to approve the Merger. See "THE SHAREHOLDER AGREEMENTS".
    
 
REVOCABILITY OF PROXIES
 
   
    The presence of a BKLA Shareholder at the BKLA Meeting (or at any
postponement or adjournment thereof) will not automatically revoke such
shareholder's proxy. However, a BKLA Shareholder may revoke a proxy at any time
prior to its exercise by (a) delivery to the Secretary of BKLA of a written
notice of revocation prior to or at the BKLA Meeting (or, if such BKLA Meeting
is adjourned or postponed, prior to or at the time the adjourned or postponed
meeting is actually held); (b) delivery to the Secretary of BKLA prior to or at
the BKLA Meeting of a duly executed proxy bearing a later date; or (c) attending
the BKLA Meeting (or, if such BKLA Meeting is adjourned or postponed, by
attending the adjourned or postponed meeting) and voting in person thereat. Any
written revocation of proxy or other related communications should be addressed
to Beverly A. Dyck, Corporate Secretary of Bank of Los Angeles, 8901 Santa
Monica Boulevard, West Hollywood, California 90069.
    
 
RECOMMENDATIONS OF THE BOARDS OF DIRECTORS
 
   
    The BKLA Board unanimously approved the Merger Agreement and the
transactions contemplated thereby. The members of the BKLA Board unanimously
believe that the Merger and the transactions contemplated by the Merger
Agreement are fair to, and in the best interests of, the BKLA Shareholders and
unanimously recommend a vote "FOR" the matters to be voted upon by such
shareholders in connection with the Merger. The conclusions of the BKLA Board
with respect to the Merger are based upon a number of factors. See "THE
MERGER--Background and Reasons for the Merger", "--Structure of the Merger",
"--Reasons for the Merger; Recommendations of the Board of Directors" and
"--Opinion of Wedbush".
    
 
OPINION OF WEDBUSH
 
   
    Wedbush Morgan Securities ("Wedbush") delivered to the BKLA Board its
opinions, dated April 15, 1998 and the date hereof, to the effect that, as of
each of such dates, the Conversion Number to be paid by Western in the Merger is
fair to the BKLA Shareholders from a financial point of view. The written
opinion of Wedbush, dated as of the date hereof, is attached to this Proxy
Statement-Prospectus as Appendix B and should be read in its entirety. See "THE
MERGER--Opinion of Wedbush".
    
 
EFFECTIVE TIME
 
   
    The Merger will become effective on the date and at the time that an
agreement of merger and related documents are filed with the State Commissioner
in accordance with the California Financial Code after filing with the
California Secretary of State, provided that the State Commissioner accepts such
agreement and documents for filing as of such date, or such later date as may be
specified in such agreement of merger or as may be required by the State
Commissioner or California Secretary of State. Subject to conditions specified
in the Merger Agreement, the parties expect the Merger to become effective on or
about September 30, 1998, although there can be no assurance as to whether or
when the Merger will become effective. See "THE MERGER AGREEMENT--Effective Time
and Effective Date" and "--Conditions".
    
 
                                       15
<PAGE>
CONDITIONS TO THE MERGER
 
    The respective obligations of Western and BKLA to consummate the Merger are
subject to certain conditions, including: (a) the approval by the BKLA
Shareholders of the principal terms of the Merger; (b) receipt of approvals,
consents and waivers required by law in connection with the Merger and the other
transactions contemplated by the Merger Agreement, including approval or waiver
by the Board of Governors of the Federal Reserve System (the "Federal Reserve
Board"), the FDIC and the State Commissioner; (c) the absence of any statute,
rule, regulation, order, injunction or decree being in effect and prohibiting
the consummation of the Merger or any other transaction contemplated by the
Merger Agreement; and (d) the Registration Statement having become effective and
there having been issued no stop order suspending the effectiveness of the
Registration Statement and no proceedings for that purpose initiated or
threatened by the Commission.
 
   
    The obligations of Western and Santa Monica Bank to consummate the Merger
also are subject to the fulfillment or waiver by Western prior to the Effective
Time of certain conditions, including the following: (a) the representations and
warranties of BKLA being true and correct unless the failure to be true and
correct is not likely to have a material adverse effect on BKLA; (b) the
performance by BKLA in all material respects of all obligations contained in the
Merger Agreement required to be performed by BKLA before the Effective Time; and
(c) receipt by Western of a customary "cold comfort" letter from Vavrinek,
Trine, Day & Co., LLP ("Vavrinek") with respect to certain financial statements
and data of BKLA.
    
 
    In addition, the obligation of BKLA to consummate the Merger also is subject
to the fulfillment or waiver by BKLA prior to the Effective Time of certain
conditions, including the following: (a) the representations and warranties of
Western being true and correct unless the failure to be true and correct is not
likely to have a material adverse effect on Western; (b) the performance by
Western in all material respects of all obligations contained in the Merger
Agreement required to be performed before the Effective Time; (c) receipt by
BKLA of a customary "cold comfort" letter from KPMG Peat Marwick LLP with
respect to certain financial statements and data of Western; and (d) as of the
Effective Time, the appointment by Western of Adriana M. Boeka, the BKLA
Chairman of the Board, as a director to the Western Board.
 
WAIVER AND AMENDMENT
 
   
    Prior to the Effective Time, the conditions to each party's obligation to
consummate the Merger may be waived by such party in whole or in part to the
extent permitted by applicable law. In addition, Western, Santa Monica Bank and
BKLA may amend the Merger Agreement at any time prior to the Effective Time by
written agreement, approved by their respective Boards, so long as the principal
terms of the Merger are not changed after approval by the BKLA Shareholders. See
"THE MERGER AGREEMENT-- Conditions".
    
 
TERMINATION
 
    The Merger Agreement may be terminated and the Merger abandoned at any time
prior to the Merger, either prior to or subsequent to its approval by the
Shareholders: (a) by mutual consent of Western and BKLA, if so determined by
their respective Boards; (b) by either Western or BKLA, if so determined by its
Board, if (i) the shareholders of BKLA fail to approve the principal terms of
the Merger, (ii) the other party materially breaches any representation,
warranty, covenant or agreement contained in the Merger Agreement and such
breach is not cured or curable within a specified grace period, or (iii) the
Merger is not consummated by December 31, 1998; (c) by either Western or BKLA,
if the approval of a governmental authority required for consummation of the
Merger is not obtained; (d) by BKLA, if the Ten Day Average Price (as defined
herein) of the Western Common Stock shall be below a certain designated level;
(e) by Western, if the BKLA Board shall fail to recommend the Merger for
approval by the BKLA
 
                                       16
<PAGE>
Shareholders; or (f) by BKLA, if the BKLA Board receives an Acquisition Proposal
(as defined herein) and determines, based upon the written advice of counsel, to
accept the proposal and that proceeding with the Merger would violate fiduciary
duties of the BKLA Board to the BKLA Shareholders. See "THE MERGER
AGREEMENT--Termination".
 
    If the Merger Agreement is terminated by BKLA pursuant to a material breach
of any representation, warranty, covenant or agreement of Western therein that
is not cured or curable within 30 days after written notice of such breach,
Western will pay to BKLA all costs and expenses incurred by BKLA in connection
with the Merger, up to $500,000. If the Merger Agreement is terminated by
Western under the circumstances described in clauses b(ii), (e) or (f) of the
preceding paragraph, BKLA will pay to Western all costs and expenses incurred by
Western in connection with the Merger, up to $500,000. See "THE MERGER
AGREEMENT--Termination Payment".
 
STOCK OPTION AGREEMENT
 
   
    As an inducement and condition to Western's entering into the Merger
Agreement, BKLA (as "Issuer") entered into a Stock Option Agreement with Western
(as "Grantee"), dated as of April 16, 1998 (the "Stock Option Agreement").
Pursuant to the Stock Option Agreement, BKLA granted to Western an irrevocable
option (the "Option"), exercisable only under certain limited and specifically
defined circumstances, none of which, to the best of BKLA's and Western's
knowledge, has occurred as of the date hereof, to purchase up to 945,585
authorized but theretofore unissued shares of BKLA Common Stock (but in no event
more than 19.9% of the shares of BKLA Common Stock outstanding at the time of
exercise), for a purchase price per share of $17.375 which is equal to the daily
average closing price of the BKLA Common Stock as reported on Nasdaq for the ten
trading days beginning April 10, 1998, subject to adjustment in certain
circumstances. The purchase of BKLA Common Stock pursuant to the Stock Option
Agreement is subject to compliance with applicable law, including receipt of any
necessary approvals under the BHCA. See "THE STOCK OPTION AGREEMENT".
    
 
    The Stock Option Agreement and the Option are intended to increase the
likelihood that the Merger will be consummated on the terms set forth in the
Merger Agreement, and may be expected to discourage offers by third parties to
acquire BKLA prior to the Merger.
 
REGULATORY APPROVALS
 
   
    The Merger is subject to prior approval by the Federal Reserve Board under
Section 3 of the BHCA, the FDIC under the Bank Merger Act and the State
Commissioner pursuant to the California Financial Code. Western and BKLA
submitted applications seeking approval of the Merger and related matters to the
FDIC and to the State Commissioner on or about June 30, 1998. Western and BKLA
also submitted a request for a waiver of jurisdiction from the Federal Reserve
Board on June 30, 1998. See "THE MERGER--Regulatory Approvals" and "THE MERGER
AGREEMENT--Conditions".
    
 
OPERATIONS AND MANAGEMENT AFTER THE MERGER
 
    Pursuant to the Merger Agreement, BKLA has elected to nominate, and Western
has consented to appoint, Adriana M. Boeka to the Western Board. Prior to the
Effective Time, the Western Board will adopt resolutions increasing the exact
number of directors by one, and Adriana M. Boeka will be appointed to fill the
vacancy on the Western Board created thereby. See "THE MERGER
AGREEMENT--Conditions". In the event that the Merger is not consummated as
contemplated, all directors of BKLA will continue to serve as directors of BKLA
until the completion of their respective terms and until their successors have
been elected and duly qualified. See "THE MERGER--Certain Effects of the
Merger".
 
                                       17
<PAGE>
INTERESTS OF CERTAIN PERSONS IN THE MERGER
 
    In considering the recommendations of the BKLA Board, BKLA Shareholders
should be aware that certain members of management of BKLA ("BKLA Management")
and of the BKLA Board have certain interests in the transactions contemplated by
the Merger Agreement that are in addition to the interests of shareholders
generally and that may create potential conflicts of interest.
 
    These interests include, among others, provisions in the Merger Agreement
relating to the indemnification of BKLA officers and directors, directors' and
officers' liability insurance and certain employee benefit plans. In addition,
Adriana M. Boeka will be appointed to the Western Board as of the Effective
Time. See "THE MERGER--Interests of Certain Persons in the Merger" and "THE
MERGER AGREEMENT--Certain Covenants--INDEMNIFICATION; DIRECTORS' AND OFFICERS'
INSURANCE".
 
   
    In addition, as a result of the Merger, all unvested options under the
BKLA's stock option plan will vest at 30 days prior to the Effective Time. As of
the BKLA Record Date, John J. Feldman, Adriana M. Boeka, Robert G. Jacobsen and
Wendy R. Moskal held 56,250, 29,500, 17,750 and 19,000 unvested options,
respectively, which had values, based on the market value of Western Common
Stock at such date and the Conversion Number, as of such date, of $605,340,
$217,767, $181,640 and $187,870, respectively.
    
 
   
    Additionally, Scott Burford, son of the late Maurice J. Burford, and
president of Burford Capital, provided consulting services to BKLA through GBS
Financial in connection with the Merger. Burford Capital is an independent
investment banking firm which acts as GBS Financial's investment banking
division. GBS Financial is a registered broker-dealer with the Commission. GBS
entered into an agreement pursuant to which it will receive a flat fee of 1% of
the value received by BKLA shareholders if BKLA is sold for between $15 per
share and $16.99 per share, or 1.5% of the value received if BKLA is sold for
$17 per share or more. GBS will receive approximately $1.5 million for its
services. GBS Financial will receive no compensation if BKLA sells for less than
$15 per share or if the Merger is not consummated.
    
 
CERTAIN FEDERAL INCOME TAX CONSEQUENCES
 
   
    It is intended that the Merger will be treated as a reorganization (a
"Reorganization") under Section 368(a) of the Internal Revenue Code of 1986, as
amended (the "Code"), so that BKLA Shareholders will not recognize any gain or
loss for tax purposes on the receipt of Western Common Stock in exchange for
their shares of BKLA Common Stock in the Merger (except to the extent such
shareholder receives cash in lieu of a fractional share interest in Western
Common Stock). Consummation of the Merger as a Reorganization is conditioned
upon receipt by Western of confirmation, immediately prior to the Effective
Time, of the opinion of Sullivan & Cromwell and receipt by BKLA of confirmation,
immediately prior to the Effective Time, of the opinion of Vavrinek, which
opinions will be dated as of the Effective Date (the "Tax Opinions"),
substantially to the effect that, for federal income tax purposes: (i) the
Merger will be treated as a reorganization within the meaning of Section 368(a)
of the Code and (ii) each of Western, Santa Monica Bank and BKLA will be a party
to that reorganization within the meaning of Section 368(b) of the Code. See
"THE MERGER--Certain Federal Income Tax Consequences".
    
 
    Because of the complexity of the tax laws and the individual nature of
certain tax consequences of the Merger to each BKLA Shareholder, each BKLA
Shareholder should consult his or her own tax advisor concerning certain other
federal and all state, local and foreign tax consequences of the Merger that may
be applicable.
 
                                       18
<PAGE>
ACCOUNTING TREATMENT
 
    For accounting and financial reporting purposes, the Merger will be
accounted for as a pooling of interests in accordance with generally accepted
accounting principles. See "THE MERGER--Accounting Treatment".
 
DISSENTERS' RIGHTS
 
   
    In connection with the Merger, the BKLA Shareholders may be entitled to
dissenters' rights under Chapter 13 of the CGCL ("Dissenters' Rights"), the text
of which is attached hereto as Appendix C. IN ORDER FOR ANY BKLA SHAREHOLDER TO
EXERCISE DISSENTERS' RIGHTS, A NOTICE OF SUCH SHAREHOLDER'S INTENTION TO
EXERCISE HIS OR HER DISSENTERS' RIGHTS AND DEMAND PAYMENT FOR HIS OR HER SHARES
AS PROVIDED IN THE CGCL MUST BE SENT BY SUCH SHAREHOLDER AND RECEIVED BY BKLA,
ON OR BEFORE THE DATE OF THE BKLA MEETING, AND ANY SUCH SHAREHOLDER MUST VOTE
AGAINST THE APPROVAL OF THE PRINCIPAL TERMS OF THE MERGER. FAILURE TO SEND SUCH
NOTICE TO BKLA, 8901 SANTA MONICA BOULEVARD, WEST HOLLYWOOD, CALIFORNIA 90069,
ATTN: BEVERLY A. DYCK, AND TO VOTE AGAINST THE PRINCIPAL TERMS OF THE MERGER
WILL RESULT IN A WAIVER OF SUCH SHAREHOLDER'S DISSENTERS' RIGHTS. SEE "THE
MERGER--DISSENTERS' RIGHTS".
    
 
RISK FACTORS
 
    In deciding whether to vote for the approval of the principal terms of the
Merger, BKLA Shareholders should carefully evaluate the matters set forth under
"Risk Factors" herein in addition to the other matters described herein.
 
   
PROPOSED PENINSULA ACQUISITION
    
 
   
    On July 24, 1998, Western executed an Agreement and Plan of Merger (the
"Peninsula Merger Agreement") with Portola Merger Sub ("Merger Sub") and
Peninsula Bank of San Diego ("Peninsula") pursuant to which Western will acquire
Peninsula through the merger of Merger Sub with and into Peninsula (the
"Peninsula Acquisition"). The Peninsula Merger Agreement provides for the
holders of common stock, no par value, of Peninsula ("Peninsula Common Stock")
to receive shares of Western Common Stock based on a purchase price of $45.75
(after giving effect to the 5% stock dividend on Peninsula Common Stock declared
by the Board of Directors of Peninsula on June 23, 1998 and payable on July 24,
1998) using a floating exchange ratio for Western Common Stock within a price
range of $38.813 to $47.438 per share. The Peninsula Merger Agreement is subject
to several conditions, including approval of the holders of Peninsula Common
Stock which is intended to be sought in the fourth quarter of 1998 and certain
regulatory approval. The offering of Western Common Stock to holders of
Peninsula Common Stock will be made only by means of a prospectus. Approval of
the principal terms of the Merger sought hereby is independent of and does not
constitute approval of the Peninsula Acquisition. See "INCORPORATION OF CERTAIN
INFORMATION BY REFERENCE" and "WESTERN--BKLA-- PENINSULA UNAUDITED PRO FORMA
COMBINED CONDENSED FINANCIAL DATA.".
    
 
MARKETS AND MARKET PRICES
 
   
    As of the BKLA Record Date, there were approximately 2,050 holders of record
of Western Common Stock. No shares of Western's Preferred Stock have been issued
or are outstanding. Western Common Stock is designated for quotation on Nasdaq
under the symbol "WEBC".
    
 
   
    As of the BKLA Record Date, there were approximately 1,700 holders of record
of BKLA Common Stock. BKLA Common Stock is designated for quotation on Nasdaq
under the symbol "BKLA".
    
 
                                       19
<PAGE>
   
    The following table summarizes the approximate high and low sales prices on
a per share basis for Western Common Stock and BKLA Common Stock for the periods
indicated.
    
 
   
<TABLE>
<CAPTION>
                                                           HIGH        LOW       HIGH        LOW
                                                         ---------  ---------  ---------  ---------
                                                            WESTERN COMMON     BKLA COMMON STOCK(2)
                                                               STOCK(1)        --------------------
                                                         --------------------
<S>                                                      <C>        <C>        <C>        <C>
1996
  First Quarter........................................      11.05       8.93       6.00       4.00
  Second Quarter.......................................      17.00       8.50       6.75       5.75
  Third Quarter........................................      14.88       8.50       6.63       5.75
  Fourth Quarter.......................................      29.75      13.86       6.75       5.75
1997
  First Quarter........................................      34.00      19.13       8.38       6.38
  Second Quarter.......................................      37.19      28.63       8.00       6.63
  Third Quarter........................................      33.25      28.63      12.00       7.50
  Fourth Quarter.......................................      33.88      29.88      15.63      10.75
1998
  First Quarter........................................      43.50      30.75      14.63      11.03
  Second Quarter.......................................      47.88      39.50      18.68      14.00
                                                         ---------  ---------  ---------  ---------
</TABLE>
    
 
- ------------------------
 
   
(1) Prior to June 3, 1997, Western Common Stock was traded solely "over the
    counter". Consequently, the prices listed before that date represent
    quotations by dealers making a market in Western Common Stock and reflect
    inter-dealer prices, without adjustments for mark-ups, mark-downs or
    commissions, and may not necessarily represent actual transactions. Prior to
    June 3, 1997, trading in Western Common Stock was limited in volume and may
    not be a reliable indicator of its market value. On June 3, 1997, Western
    Common Stock was designated for quotation on Nasdaq and on that date Western
    effected a 1.0 for 8.5 reverse stock split. The prices of Western Common
    Stock prior to June 3, 1997 in the preceding table have been adjusted for
    the Reverse Stock Split. The prices listed above for periods subsequent to
    June 3, 1997 are as reported by Nasdaq.
    
 
   
(2) Prior to July 29, 1996, BKLA Common Stock was traded on a very limited basis
    on the over-the-counter market through various brokerage firms.
    Consequently, the prices listed before that date represent quotations by
    dealers making a market in BKLA Common Stock and reflect inter-dealer
    prices, without adjustments for mark-ups, mark-downs or commissions, and may
    not necessarily represent actual transactions. Prior to July 29, 1996,
    trading in BKLA Common Stock was limited in volume and may not be a reliable
    indicator of its market value. The prices listed above for periods
    subsequent to July 29, 1996 are as reported by Nasdaq.
    
 
   
    The following table sets forth the closing price per share of Western Common
Stock as reported by Nasdaq, the closing price per share of BKLA Common Stock as
reported by Nasdaq and the "Equivalent Per Share Price" (as defined below) of
BKLA Common Stock as of April 16, 1998, the last trading day before the date on
which Western and BKLA announced the execution of the Merger Agreement and as of
August 5, 1998, the last practicable date prior to the date of this Proxy
Statement-Prospectus. The "Equivalent Per Share Price" of BKLA Common Stock on
any date equals the closing price of the Western Common Stock on such date, as
reported on Nasdaq, multiplied by the Conversion Number.
    
 
   
<TABLE>
<CAPTION>
                                              WESTERN COMMON     BKLA COMMON    EQUIVALENT PER
MARKET PRICE PER SHARE AS OF                      STOCK             STOCK         SHARE PRICE
- -------------------------------------------  ----------------  ---------------  ---------------
<S>                                          <C>               <C>              <C>
April 16, 1998.............................     $  47.88          $   16.50        $   20.22
August 5, 1998.............................     $  39.375         $   16.00        $   16.63
</TABLE>
    
 
                                       20
<PAGE>
    Because the Conversion Number is fixed pursuant to the Merger Agreement, a
change in the trading price of Western Common Stock before the Effective Time
will affect the implied market value of the Western Common Stock to be received
in the Merger by BKLA Shareholders. See "RISK FACTORS-- Limited Market for
Western Common Stock". THERE CAN BE NO ASSURANCE AS TO THE MARKET PRICE OF
WESTERN COMMON STOCK AT ANY TIME BEFORE, AT OR AFTER THE EFFECTIVE TIME.
SHAREHOLDERS ARE URGED TO OBTAIN CURRENT MARKET QUOTATIONS FOR WESTERN COMMON
STOCK AND BKLA COMMON STOCK.
 
   
    Upon consummation of the Merger, it is expected that there will be up to
approximately 3,750 holders of record of Western Common Stock.
    
 
                                       21
<PAGE>
SUMMARY HISTORICAL FINANCIAL DATA
 
  WESTERN
 
   
    The following summary historical financial data for the six months ended
June 30, 1998 and 1997 are derived from unaudited consolidated financial
statements of Western and include, in the opinion of the management of Western
("Western Management"), all adjustments (consisting only of normal accruals)
necessary to present fairly the data for such periods. The results for the six
month period ended June 30, 1998 are not necessarily indicative of the results
to be expected for the full fiscal year. The following summary historical
financial data for the five years ended December 31, 1997 are derived from the
audited consolidated financial statements of Western. The data should be read in
conjunction with the consolidated financial statements, related notes, and other
financial information included or incorporated by reference in this Proxy
Statement-Prospectus.
    
 
   
<TABLE>
<CAPTION>
                                        AT OR FOR THE SIX MONTHS
                                           ENDED JUNE 30,(1)               AT OR FOR THE YEARS ENDED DECEMBER 31,
                                        ------------------------  ---------------------------------------------------------
                                           1998         1997         1997        1996(2)     1995(3)     1994       1993
                                        -----------  -----------  -----------  -----------  ---------  ---------  ---------
                                                           (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                     <C>          <C>          <C>          <C>          <C>        <C>        <C>
RESULTS OF OPERATIONS:
  Interest income.....................  $    68,922  $    48,758  $   101,034  $    74,237  $  62,629  $  53,079  $  57,722
  Interest expense....................       18,318       14,330       29,358       22,311     19,804     13,388     18,677
                                        -----------  -----------  -----------  -----------  ---------  ---------  ---------
    NET INTEREST INCOME...............       50,604       34,428       71,676       51,926     42,825     39,691     39,045
  Provision for loan and lease
    losses............................          300        1,400        2,800        1,018      8,564      3,510     17,919
                                        -----------  -----------  -----------  -----------  ---------  ---------  ---------
    NET INTEREST INCOME AFTER
      PROVISION FOR LOAN AND LEASE
      LOSSES..........................       50,304       33,028       68,876       50,908     34,261     36,181     21,126
  Non-interest income.................        7,858        5,028        9,686        9,875      7,826      8,447     15,871
  Non-interest expense................       35,513       29,800       65,757       48,138     45,609     41,235     45,825
                                        -----------  -----------  -----------  -----------  ---------  ---------  ---------
    INCOME (LOSS) BEFORE INCOME
      TAXES...........................       22,649        8,256       12,805       12,645     (3,522)     3,393     (8,828)
  Income tax expense (benefit)........       11,142        4,811        9,643        3,656     (1,733)     1,680     (1,979)
                                        -----------  -----------  -----------  -----------  ---------  ---------  ---------
    INCOME (LOSS) BEFORE CUMULATIVE
      EFFECT OF A CHANGE IN ACCOUNTING
      PRINCIPLE.......................       11,507        3,445        3,162        8,989     (1,789)     1,713     (6,849)
  Cumulative effect of change in
    accounting principle..............                                                                                  (41)
                                        -----------  -----------  -----------  -----------  ---------  ---------  ---------
    NET INCOME (LOSS).................  $    11,507  $     3,445  $     3,162  $     8,989  $  (1,789) $   1,713  $  (6,890)
                                        -----------  -----------  -----------  -----------  ---------  ---------  ---------
                                        -----------  -----------  -----------  -----------  ---------  ---------  ---------
    COMPREHENSIVE INCOME (LOSS).......  $    11,671  $     3,484  $     3,930  $     8,666  $   2,876  $  (3,544) $  (6,837)
                                        -----------  -----------  -----------  -----------  ---------  ---------  ---------
                                        -----------  -----------  -----------  -----------  ---------  ---------  ---------
ENDING BALANCE SHEET DATA:
  Assets..............................  $ 2,016,749  $ 1,367,665  $ 1,383,510  $ 1,338,913  $ 866,385  $ 759,194  $ 799,558
  Securities..........................      224,135      284,191      207,514      332,818    184,978    220,905    248,879
  Loans and leases, net of deferred
    fees and unearned income..........    1,274,611      849,141      880,734      817,358    543,042    439,241    460,975
  Allowance for loan and lease
    losses............................       24,681       15,345       15,894       15,757     13,130     12,115     19,077
  Goodwill............................      145,525       31,699       30,430       32,968      4,131      2,464      2,616
  Deposits............................    1,697,352    1,207,714    1,226,793    1,177,014    774,057    675,971    731,829
  Borrowed funds......................       15,756       18,194       12,751       20,290      7,366     15,161     10,168
  Common shareholders' equity.........      289,146      131,642      129,655      129,047     77,628     62,274     51,572
</TABLE>
    
 
                                       22
<PAGE>
 
   
<TABLE>
<CAPTION>
                                        AT OR FOR THE SIX MONTHS
                                           ENDED JUNE 30,(1)               AT OR FOR THE YEARS ENDED DECEMBER 31,
                                        ------------------------  ---------------------------------------------------------
                                           1998         1997         1997        1996(2)     1995(3)     1994       1993
                                        -----------  -----------  -----------  -----------  ---------  ---------  ---------
                                                           (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                     <C>          <C>          <C>          <C>          <C>        <C>        <C>
PER SHARE DATA AND OTHER SELECTED
  RATIOS:
  Earnings (loss) per common and
    common equivalent share
    Basic.............................  $      0.78  $      0.33  $      0.30  $      1.11  $   (0.28) $    0.34  $   (1.68)
    Diluted...........................         0.77         0.32         0.29         1.09      (0.28)      0.33      (1.68)
  Dividends declared per share(4).....         0.15      --              0.30      --          --         --         --
  Book value per share................        18.41        12.40        12.18        12.36      10.64      10.52      12.59
  Tangible book value per share.......         9.15         9.41         9.32         9.20      10.08      10.10      11.95
  Shareholders' equity to assets at
    period end........................        14.34%        9.63%        9.37%        9.64%      8.96%      8.20%      6.45%
  Tangible shareholders' equity to
    assets at period end..............         7.68         7.48         7.33         7.36       8.52       7.90       6.14
  Return on average assets............         1.20         0.52         0.23         0.90      (0.21)      0.22      (0.79)
  Return on average equity............         8.97         5.27         2.37         9.78      (2.59)      2.65     (12.54)
  Average equity/average assets.......        13.38         9.90         9.82         9.25       8.31       8.20       6.26
  Net interest margin.................         6.23         5.91         5.99         5.88       5.78       5.74       4.93
</TABLE>
    
 
- --------------------------
 
   
(1) On January 27, 1998, Western acquired Santa Monica Bank in a transaction
    accounted for as a purchase. At January 31, 1998, Santa Monica Bank had
    approximately $671 million in assets, $388 million in net loans and $584
    million in deposits. At the time of the SMB Acquisition, Western issued
    approximately 2,653,000 shares of Western Common Stock to certain former
    shareholders of Santa Monica Bank and also paid approximately $114 million
    to the other former shareholders of Santa Monica Bank. Western also raised
    approximately $65 million in additional equity in a private placement by
    issuing 2,327,550 shares of Western Common Stock. Santa Monica Bank's
    results of operations are included only since January 27, 1998. Due to the
    relatively large size of this transaction, any comparison of data as of and
    for the six months ended June 30, 1998 to data as of or for prior dates or
    periods may not be meaningful.
    
 
(2) On September 30, 1996, Western acquired Western Bank in a transaction
    accounted for as a purchase. At September 30, 1996, Western Bank had
    approximately $410 million in assets, $198 million in net loans and $353
    million in deposits. At the time of such acquisition, Western also raised
    approximately $42 million in additional equity in a private placement by
    issuing 3,076,045 shares of Western Common Stock. Western Bank's results of
    operations are included only since the fourth quarter of fiscal 1996. Due to
    the relatively large size of this transaction, any comparison of data as of
    and for the year ended December 31, 1996 to data as of or for prior dates or
    periods may not be meaningful.
 
   
(3) In 1995, Western, through a private placement and a separate shareholders'
    rights and public offering, raised approximately $9 million in additional
    equity, net of approximately $470,000 in offering costs, in connection with
    the issuance of 874,589 shares of Western Common Stock. Also in 1995
    Western, through a private placement of 474,000 shares, raised approximately
    $3 million in additional equity in connection with the issuance of shares of
    Western Common Stock.
    
 
   
(4) A $0.15 per share dividend was declared in the fourth quarter of 1997 and
    was paid in the first quarter of 1998.
    
 
                                       23
<PAGE>
  BKLA
 
   
    The following summary historical financial data for the six months ended
June 30, 1998 and 1997 are derived from unaudited financial statements of BKLA
and include, in the opinion of BKLA Management, all adjustments (consisting only
of normal accruals) necessary to present fairly the data for such periods. The
results for the six month period ended June 30, 1998 are not necessarily
indicative of the results to be expected for the full fiscal year. The following
summary historical financial data for the five years ended December 31, 1997 are
derived from the audited financial statements of BKLA. The data should be read
in conjunction with the consolidated financial statements, related notes, and
other financial information included or incorporated by reference in this Proxy
Statement-Prospectus.
    
 
   
<TABLE>
<CAPTION>
                                                  AT OR FOR THE SIX
                                                  MONTHS ENDED JUNE
                                                       30,(1,2)               AT OR FOR THE YEARS ENDED DECEMBER 31,
                                                 --------------------  -----------------------------------------------------
                                                   1998       1997      1997(2)     1996     1995(3,4)    1994       1993
                                                 ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                                                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                              <C>        <C>        <C>        <C>        <C>        <C>        <C>
RESULTS OF OPERATIONS:
  Interest income..............................  $  10,505  $   6,651  $  14,854  $  10,561  $   6,819  $   5,794  $   7,092
  Interest expense.............................      3,008      1,746      3,931      3,087      1,852      1,758      2,262
                                                 ---------  ---------  ---------  ---------  ---------  ---------  ---------
    NET INTEREST INCOME........................      7,497      4,905     10,923      7,474      4,967      4,036      4,830
  Provision for (recovery of) loan and lease
    losses.....................................     --            410        410        750       (311)    --          1,953
                                                 ---------  ---------  ---------  ---------  ---------  ---------  ---------
    NET INTEREST INCOME AFTER PROVISION FOR
      LOAN AND LEASE LOSSES....................      7,497      4,495     10,513      6,724      5,278      4,036      2,877
  Non-interest income..........................      1,030        629      1,388      1,037        878        923      1,725
  Non-interest expense.........................      5,274      4,089      8,542      6,760      5,510      6,171      6,915
                                                 ---------  ---------  ---------  ---------  ---------  ---------  ---------
    INCOME (LOSS) BEFORE INCOME TAXES..........      3,253      1,035      3,359      1,001        646     (1,212)    (2,313)
  Income tax expense (benefit).................      1,216     --           (372)    --         --         --         --
                                                 ---------  ---------  ---------  ---------  ---------  ---------  ---------
    NET INCOME (LOSS)..........................  $   2,037  $   1,035  $   3,731  $   1,001  $     646  $  (1,212) $  (2,313)
                                                 ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                                 ---------  ---------  ---------  ---------  ---------  ---------  ---------
    COMPREHENSIVE INCOME (LOSS)................  $   2,085  $   1,030  $   3,903  $     641  $   1,259  $  (1,685) $  (2,313)
                                                 ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                                 ---------  ---------  ---------  ---------  ---------  ---------  ---------
ENDING BALANCE SHEET DATA:
  Assets.......................................  $ 289,768  $ 193,276  $ 272,033  $ 130,705  $ 129,745  $  80,507  $  98,992
  Securities...................................     88,679     49,493     60,433     22,126     33,322     30,602     28,420
  Loans and leases, net of deferred fees and
    unearned income............................    153,645    110,409    142,633     72,266     66,021     38,114     50,760
  Allowance for loan and lease losses..........      2,683      1,829      2,819      1,682      2,358      1,633      2,478
  Goodwill.....................................      5,504      2,129      5,939      1,662      1,733     --         --
  Deposits.....................................    242,552    171,308    238,012    115,596    114,850     74,471     91,388
  Borrowed funds...............................     12,873      1,846      1,849      1,842      1,836      1,830      1,827
  Common shareholders' equity..................     33,551     19,591     31,054     12,632     11,991      3,817      5,502
PER SHARE DATA AND OTHER SELECTED RATIOS:
  Earnings (loss) per common and common
    equivalent share
    Basic......................................  $    0.43  $    0.36  $    1.16  $    0.46  $    0.63  $   (4.85) $   (9.25)
    Diluted....................................       0.38       0.32       1.00       0.40       0.51      (4.85)     (9.25)
  Dividends declared per share.................     --         --         --         --         --         --         --
  Book value per share.........................       6.91       5.50       6.54       5.75       5.46      15.25      22.00
  Tangible book value per share................       5.78       4.90       5.29       5.00       4.67      15.25      22.00
  Shareholders' equity to assets at period
    end........................................      11.58%     10.14%     11.42%      9.66%      9.24%      4.74%      5.56%
  Tangible shareholders' equity to assets at
    period end.................................       9.87       9.14       9.44       8.50       8.01       4.74       5.56
  Return on average assets.....................       1.48       1.29       2.05       0.79       0.77      (1.36)     (2.08)
  Return on average equity.....................      12.78      13.02      21.10       8.13       8.71     (26.01)    (32.30)
  Average equity/average assets................      11.59       9.88       9.72       9.72       8.89       5.24       6.44
  Net interest margin..........................       6.19       6.77       6.67       6.47       6.63       5.04       4.82
</TABLE>
    
 
- --------------------------
 
   
(1) On December 31, 1997, BKLA acquired CNB in a transaction accounted for as a
    purchase. At December 31, 1997, CNB had approximately $60 million in assets,
    $26 million in net loans and $51 million in deposits. At the
    
 
                                       24
<PAGE>
   
    time of such acquisition, BKLA issued 1,155,326 shares of BKLA Common Stock
    to former shareholders of CNB. CNB's results of operations are included only
    since January 1998. Due to the relatively large size of this transaction,
    any comparison of data as of and for the six months ended June 30, 1998 to
    data as of or for prior dates or periods may not be meaningful.
    
 
   
(2) On April 1, 1997, BKLA acquired AWB in a transaction accounted for as a
    purchase. At April 1, 1997, AWB had approximately $67 million in assets, $37
    million in net loans and $61 million in deposits. At the time of such
    acquisition, BKLA issued 1,367,493 shares of BKLA Common Stock to former
    shareholders of AWB. AWB's results of operations are included only since
    April 1997. Due to the relatively large size of this transaction, any
    comparison of data as of and for the six months ended June 30, 1998 and the
    year ended December 31, 1997 to data as of or for prior dates or periods may
    not be meaningful.
    
 
(3) On November 15, 1995, BKLA acquired WTB in a transaction accounted for as a
    purchase. At November 15, 1995, WTB had approximately $42 million in assets,
    $21 million in net loans and $40 million in deposits. At the time of such
    acquisition, BKLA issued 346,325 shares of BKLA Common Stock to former
    shareholders of WTB. WTB's results of operations are included only since
    November 1995.
 
(4) On March 31, 1995, BKLA received a capital infusion of approximately $3.4
    million for 946,352 shares of BKLA Common Stock and 473,176 warrants. On
    November 30, 1995 as a result of a rights offering to all shareholders of
    record at October 24, 1995, 651,325 shares of BKLA Common Stock and 217,160
    warrants were issued for net proceeds of approximately $2.1 million. Each
    warrant issued in both the capital infusion and the rights offering entitled
    the holder thereof to purchase one share of BKLA Common Stock for $3.75 and
    will expire on December 1, 1998.
 
                                       25
<PAGE>
SUMMARY UNAUDITED PRO FORMA COMBINED FINANCIAL DATA
 
    The following table sets forth certain summary unaudited pro forma combined
financial data for Western after giving effect to the Merger, as if it had
occurred as of the beginning of each of the periods presented, using the
Conversion Number of 0.4224 and accounting for the Merger as a pooling of
interests. See "THE MERGER--Accounting Treatment". This information should be
read in conjunction with the historical consolidated financial statements of
Western and BKLA including the notes thereto, appearing elsewhere in this Proxy
Statement-Prospectus or incorporated herein by reference. See "UNAUDITED PRO
FORMA COMBINED CONDENSED FINANCIAL DATA".
 
    The unaudited pro forma combined condensed balance sheets are not
necessarily indicative of the actual financial position that would have existed
had the Merger been consummated on the dates indicated, or that may exist in the
future. The unaudited pro forma combined condensed results of operations are not
necessarily indicative of the results that would have occurred had the Merger
been consummated on the dates indicated or that may be achieved in the future.
Assuming the consummation of the Merger, the actual financial position and
results of operations will differ, perhaps significantly, from the pro forma
amounts reflected herein because of a variety of factors, including changes in
value and changes in operating results between the dates of the unaudited pro
forma financial data and the date on which the Merger takes place.
 
   
<TABLE>
<CAPTION>
                                                   AT OR FOR THE SIX MONTHS   AT OR FOR THE YEARS ENDED DECEMBER
                                                    ENDED JUNE 30,(1,4,5)                     31,
                                                   ------------------------  -------------------------------------
                                                      1998         1997        1997(5)      1996(2)    1995(3,6,7)
                                                   -----------  -----------  -----------  -----------  -----------
                                                            (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                <C>          <C>          <C>          <C>          <C>
RESULTS OF OPERATIONS:
  Interest income................................  $    83,358  $    77,817  $   162,440  $    84,798   $  69,448
  Interest expense...............................       22,522       23,072       48,060       25,398      21,656
                                                   -----------  -----------  -----------  -----------  -----------
    Net interest income..........................       60,836       54,745      114,380       59,400      47,792
  Provision for loan and lease losses............          380        1,810        3,210        1,768       8,253
                                                   -----------  -----------  -----------  -----------  -----------
    Net interest income after provision for loan
      and lease losses...........................       60,456       52,935      111,170       57,632      39,539
  Non-interest income............................        9,502        9,191       18,348       10,912       8,704
  Non-interest expense...........................       43,814       49,635      107,478       54,898      51,119
                                                   -----------  -----------  -----------  -----------  -----------
    Income (loss) before income taxes............       26,144       12,491       22,040       13,646      (2,876)
  Income tax expense (benefit)...................       12,719        7,201       13,948        3,656      (1,733)
                                                   -----------  -----------  -----------  -----------  -----------
    Net income (loss)............................  $    13,425  $     5,290  $     8,092  $     9,990   $  (1,143)
                                                   -----------  -----------  -----------  -----------  -----------
                                                   -----------  -----------  -----------  -----------  -----------
    COMPREHENSIVE INCOME (LOSS)..................  $    13,756  $     4,514  $     7,833  $     9,307   $   4,135
                                                   -----------  -----------  -----------  -----------  -----------
                                                   -----------  -----------  -----------  -----------  -----------
ENDING BALANCE SHEET DATA:
  Assets.........................................  $ 2,308,917  $ 1,560,941  $ 1,657,223  $ 1,469,618   $ 996,130
  Securities.....................................      312,814      333,684      267,947      354,944     218,300
  Loans and leases, net of deferred fees and
    unearned income..............................    1,428,256      959,550    1,023,367      889,624     609,063
  Allowance for loan and lease losses............       27,364       17,174       18,713       17,439      15,488
  Goodwill.......................................      151,029       33,828       36,369       34,630       5,864
  Deposits.......................................    1,939,904    1,379,022    1,464,805    1,292,610     888,907
  Borrowed funds.................................       28,629       20,040       14,600       22,132       9,202
  Common shareholders' equity....................      317,297      151,233      155,309      141,679      89,619
</TABLE>
    
 
                                       26
<PAGE>
 
   
<TABLE>
<CAPTION>
                                                   AT OR FOR THE SIX MONTHS   AT OR FOR THE YEARS ENDED DECEMBER
                                                    ENDED JUNE 30,(1,4,5)                     31,
                                                   ------------------------  -------------------------------------
                                                      1998         1997        1997(5)      1996(2)    1995(3,6,7)
                                                   -----------  -----------  -----------  -----------  -----------
                                                            (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                <C>          <C>          <C>          <C>          <C>
PER SHARE DATA AND OTHER SELECTED RATIOS:
  Earnings (loss) per common and common
    equivalent share
    Basic........................................  $      0.76  $      0.32  $      0.48  $      1.11   $   (0.17)
    Diluted......................................         0.74         0.31         0.47         1.07       (0.17)
  Dividends declared per share(8)................         0.15      --              0.30      --           --
  Book value per share...........................        17.78        12.39        12.19        12.42       10.90
  Tangible book value per share..................         9.32         9.62         9.33         9.38       10.19
  Shareholders' equity to assets at period end...        13.75%        9.69%        9.37%        9.64%       9.00%
  Tangible shareholders' equity to assets at
    period end...................................         7.71         7.69         7.34         7.46        8.46
  Return on average assets.......................         1.16         0.48         0.36         0.89       (0.12)
  Return on average equity.......................         8.57         3.58         2.69         9.59       (1.49)
  Average equity/average assets..................        13.53        13.51        13.24         9.30        8.36
  Net interest margin............................         6.22         6.03         6.03         5.95        5.86
</TABLE>
    
 
- --------------------------
 
   
(1) On January 27, 1998, Western acquired Santa Monica Bank in a transaction
    accounted for as a purchase. At January 31, 1998, Santa Monica Bank had
    approximately $671 million in assets, $388 million in net loans and $584
    million in deposits. At the time of the SMB Acquisition, Western issued
    approximately 2,653,000 shares of Western Common Stock to certain former
    shareholders of Santa Monica Bank and also paid approximately $114 million
    to the other former shareholders of Santa Monica Bank. Western also raised
    approximately $65 million in additional equity in a private placement by
    issuing 2,327,550 shares of Western Common Stock. Santa Monica Bank's
    results of operations are included only since January 27, 1998. Due to the
    relatively large size of this transaction, any comparison of data as of and
    for the six months ended June 30, 1998 to data as of or for prior dates or
    periods may not be meaningful.
    
 
(2) On September 30, 1996, Western acquired Western Bank in a transaction
    accounted for as a purchase. At September 30, 1996, Western Bank had
    approximately $410 million in assets, $198 million in net loans and $353
    million in deposits. At the time of such acquisition, Western also raised
    approximately $42 million in additional equity in a private placement by
    issuing 3,076,045 shares of Western Common Stock. Western Bank's results of
    operations are included only since the fourth quarter of fiscal 1996. Due to
    the relatively large size of this transaction, any comparison of data as of
    and for the year ended December 31, 1996 to data as of or for prior dates or
    periods may not be meaningful.
 
   
(3) In 1995, Western, through a private placement and a separate shareholders'
    rights and public offering, raised approximately $9 million in additional
    equity, net of approximately $470,000 in offering costs, in connection with
    the issuance of 874,589 shares of Western Common Stock. Also in 1995
    Western, through a private placement of 474,000 shares, raised approximately
    $3 million in additional equity in connection with the issuance of shares of
    Western Common Stock.
    
 
   
(4) On December 31, 1997, BKLA acquired CNB in a transaction accounted for as a
    purchase. At December 31, 1997, CNB had approximately $60 million in assets,
    $26 million in net loans and $51 million in deposits. At the time of such
    acquisition, BKLA issued 1,155,326 shares of BKLA Common Stock to former
    shareholders of CNB. CNB's results of operations are included only since
    January of fiscal 1998. Due to the relatively large size of this
    transaction, any comparison of data as of and for the six months ended June
    30, 1998 to data as of or for prior dates or periods may not be meaningful.
    
 
   
(5) On April 1, 1997, BKLA acquired AWB in a transaction accounted for as a
    purchase. At April 1, 1997, AWB had approximately $67 million in assets, $37
    million in net loans and $61 million in deposits. At the time of such
    acquisition, BKLA issued 1,367,493 shares of BKLA Common Stock to former
    shareholders of AWB. AWB's results of operations are included only since
    April of fiscal 1997. Due to the relatively large size of this transaction,
    any comparison of data as of and for the six months ended June 30, 1998 and
    the year ended December 31, 1997 to data as of or for prior dates or periods
    may not be meaningful.
    
 
(6) On November 15, 1995, BKLA acquired WTB in a transaction accounted for as a
    purchase. At November 15, 1995, WTB had approximately $42 million in assets,
    $21 million in net loans and $40 million in deposits. At the time of such
    acquisition, BKLA issued 346,325 shares of BKLA Common Stock to former
    shareholders of WTB. WTB's results of operations are included only since
    November of fiscal 1995.
 
(7) On March 31, 1995, BKLA received a capital infusion of approximately $3.4
    million for 946,352 shares of BKLA Common Stock and 473,176 warrants. On
    November 30, 1995 as a result of a rights offering to all shareholders of
    record at October 24, 1995, 651,325 shares of BKLA Common Stock and 217,160
    warrants were issued for net proceeds of approximately $2.1 million. Each
    warrant issued in both the capital infusion and the rights offering entitled
    the holder to purchase one share of BKLA Common Stock for $3.75 and will
    expire on December 1, 1998.
 
   
(8) A $0.15 dividend was declared in the fourth quarter of 1997 and was paid in
    the first quarter of 1998.
    
 
                                       27
<PAGE>
SELECTED HISTORICAL AND PRO FORMA PER SHARE DATA
 
   
    The following table sets forth for Western Common Stock and BKLA Common
Stock certain selected historical and unaudited pro forma equivalent per share
data at June 30, 1998 and 1997 and for the six months ended June 30, 1998 and
1997, and at the end of and for each of the three years ended December 31, 1997,
giving effect to the Merger using the pooling-of-interests method of accounting.
The information is derived from the historical consolidated financial statements
of Western and the historical financial statements of BKLA, including the
related notes thereto, and the pro forma combined financial information giving
effect to the Merger, including the related notes thereto, appearing elsewhere
herein. The information below should be read in conjunction with the historical
and pro forma combined financial information of Western and BKLA, including the
notes thereto, appearing elsewhere in this Proxy Statement-Prospectus or
incorporated herein by reference. See "UNAUDITED PRO FORMA COMBINED CONDENSED
FINANCIAL DATA" and "INCORPORATION OF CERTAIN INFORMATION BY REFERENCE".
    
 
   
<TABLE>
<CAPTION>
                                                                            FOR THE SIX MONTHS
                                                                                                  FOR THE YEARS ENDED DECEMBER
                                                                              ENDED JUNE 30,                   31,
                                                                           --------------------  -------------------------------
                                                                             1998       1997       1997       1996       1995
                                                                           ---------  ---------  ---------  ---------  ---------
<S>                                                                        <C>        <C>        <C>        <C>        <C>
BASIC EARNINGS (LOSS) PER SHARE(1):
  Western................................................................  $    0.78  $    0.33  $    0.30  $    1.11  $   (0.28)
  BKLA...................................................................       0.43       0.36       1.16       0.46       0.63
  Western combined pro forma.............................................       0.76       0.32       0.48       1.11      (0.17)
  BKLA equivalent pro forma..............................................       0.32       0.13       0.20       0.47      (0.07)
DILUTED EARNINGS (LOSS) PER SHARE(1):
  Western................................................................  $    0.77  $    0.32  $    0.29  $    1.09  $   (0.28)
  BKLA...................................................................       0.38       0.32       1.00       0.40       0.51
  Western combined pro forma.............................................       0.74       0.31       0.47       1.07      (0.17)
  BKLA equivalent pro forma..............................................       0.31       0.13       0.20       0.45      (0.07)
DIVIDENDS PER SHARE(2):
  Western dividends declared per share(3)................................       0.15     --           0.30     --         --
  BKLA dividends declared per share......................................     --         --         --         --         --
  BKLA equivalent pro forma dividends declared per share.................       0.06     --           0.13     --         --
</TABLE>
    
 
   
<TABLE>
<CAPTION>
                                                                                           AT JUNE 30,   AT DEC 31,
                                                                                              1998          1997
                                                                                          -------------  -----------
<S>                                                                                       <C>            <C>
BOOK VALUE PER SHARE(4):
  Western...............................................................................    $   18.41     $   12.18
  BKLA..................................................................................         6.91          6.54
  Western combined pro forma............................................................        17.78         12.19
  BKLA equivalent pro forma.............................................................         7.51          5.15
TANGIBLE BOOK VALUE PER SHARE(4):
  Western...............................................................................    $    9.15     $    9.32
  BKLA..................................................................................         5.78          5.29
  Western combined pro forma............................................................         9.32          9.33
  BKLA equivalent pro forma.............................................................         3.94          3.94
</TABLE>
    
 
- --------------------------
 
(1) The Western combined pro forma earnings (loss) per share amounts were
    calculated by using aggregate historical income (loss) information divided
    by the average pro forma shares outstanding of the combined entity. The
    average pro forma shares outstanding of the combined entity were calculated
    by combining the Western historical shares outstanding with the historical
    shares outstanding of BKLA as adjusted by the Conversion Number of 0.4224.
    See "THE MERGER AGREEMENT--Exchange of Stock Certificates; Dividends". The
    BKLA equivalent pro forma earnings (loss) per share amounts were computed by
    multiplying the Western combined pro forma amounts by the Conversion Number
    of 0.4224.
 
(2) The BKLA equivalent pro forma dividends declared per share amounts were
    computed by multiplying the Western dividends declared per share by the
    Conversion Number of 0.4224.
 
   
(3) A $0.15 dividend was declared in the fourth quarter of 1997 and was paid in
    the first quarter of 1998.
    
 
   
(4) The Western combined pro forma book value per share and tangible book value
    per share amounts are based on the aggregate historical common shareholders'
    equity of BKLA and Western divided by the total pro forma common shares
    outstanding of the combined entity based on the Conversion Number of 0.4224.
    The BKLA equivalent pro forma book value per share and tangible book value
    per share amounts at period end represent the Western pro forma amounts
    multiplied by the Conversion Number of 0.4224. See "THE MERGER
    AGREEMENT--Exchange of Stock Certificates; Dividends".
    
 
                                       28
<PAGE>
   
SUMMARY FINANCIAL DATA REGARDING PENINSULA
    
 
   
  SUMMARY HISTORICAL FINANCIAL DATA
    
 
   
    The following summary historical financial data for the six months ended
June 30, 1998 and 1997 are derived from unaudited consolidated financial
statements of Peninsula and include, in the opinion of Peninsula Management, all
adjustments (consisting only of normal accruals) necessary to present fairly the
data for such periods. The results for the six month period ended June 30, 1998
are not necessarily indicative of the results to be expected for the full fiscal
year. The following summary historical financial data for the five years ended
December 31, 1997 are derived from the audited consolidated financial statements
of Peninsula. The data should be read in conjunction with the consolidated
financial statements, related notes, and other financial information included or
incorporated by reference in this Proxy Statement-Prospectus.
    
   
<TABLE>
<CAPTION>
                                                AT OR FOR THE SIX
                                                MONTHS ENDED JUNE
                                                       30,                  AT OR FOR THE YEARS ENDED DECEMBER 31,
                                               --------------------  -----------------------------------------------------
<S>                                            <C>        <C>        <C>        <C>        <C>        <C>        <C>
                                                 1998       1997       1997       1996       1995       1994       1993
                                               ---------  ---------  ---------  ---------  ---------  ---------  ---------
 
<CAPTION>
                                                              (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                            <C>        <C>        <C>        <C>        <C>        <C>        <C>
RESULTS OF OPERATIONS:
  Interest Income............................  $  14,625  $  12,699  $  27,033  $  24,045  $  21,743  $  17,911  $  16,989
  Interest Expense...........................      4,429      3,992      8,600      7,766      7,095      5,009      5,274
                                               ---------  ---------  ---------  ---------  ---------  ---------  ---------
      NET INTEREST INCOME....................     10,196      8,707     18,433     16,279     14,648     12,902     11,715
  Provision for loan and lease losses........        139        325        498        566        470        795      1,083
                                               ---------  ---------  ---------  ---------  ---------  ---------  ---------
      NET INTEREST INCOME AFTER PROVISION FOR
        LOAN AND LEASE LOSSES................     10,057      8,382     17,935     15,713     14,178     12,107     10,632
  Non-interest income........................      2,467      2,059      4,154      3,691      3,165      2,818      2,809
  Non-interest expense.......................      8,958      7,724     16,780     14,473     13,380     12,300     11,411
                                               ---------  ---------  ---------  ---------  ---------  ---------  ---------
      NET INCOME BEFORE TAXES................      3,566      2,717      5,309      4,931      3,963      2,625      2,030
  Income tax expense.........................      1,337      1,044      1,708      1,877      1,421        745         69
                                               ---------  ---------  ---------  ---------  ---------  ---------  ---------
      NET INCOME.............................  $   2,229  $   1,673  $   3,601  $   3,054  $   2,542  $   1,880  $   1,961
                                               ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                               ---------  ---------  ---------  ---------  ---------  ---------  ---------
      COMPREHENSIVE INCOME...................  $   2,269  $   1,679  $   3,646  $   3,059  $   3,040  $   1,264  $   1,961
                                               ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                               ---------  ---------  ---------  ---------  ---------  ---------  ---------
 
ENDING BALANCE SHEET DATA:
  Assets.....................................  $ 428,272  $ 368,434  $ 418,245  $ 343,820  $ 318,874  $ 267,850  $ 262,064
  Securities.................................    111,618     97,079    125,041     84,980     84,707     56,810     65,019
  Loans and leases, net of deferred fees and
    unearned income..........................    243,227    222,880    234,556    212,602    190,833    175,352    164,567
  Allowance for loan and lease losses........      2,442      2,235      2,358      2,150      1,853      1,898      1,585
  Goodwill...................................     --         --         --         --         --         --         --
  Deposits...................................    397,055    341,384    389,232    318,709    296,970    248,484    243,414
  Borrowed funds.............................        600        600        600        600        466        600        600
  Common shareholders' equity................     27,258     23,754     25,356     22,414     19,998     17,551     16,954
 
PER SHARE DATA AND OTHER SELECTED RATIOS:
  Earnings per common and common equivalent
    share
    Basic....................................  $    0.90  $    0.67  $    1.45  $    1.23  $    1.02  $    0.76  $    0.79
    Diluted..................................       0.90       0.67       1.45       1.23       1.02       0.76       0.79
  Dividends declared per share...............       0.23       0.14       0.28       0.26       0.24       0.22       0.22
  Book value per share.......................      10.96       9.55      10.20       9.01       8.04       7.06       6.82
  Tangible book value per share..............      10.96       9.55      10.20       9.01       8.04       7.06       6.82
  Shareholders' equity to assets at period
    end......................................       6.36%      6.45%      6.06%      6.52%      6.27%      6.55%      6.47%
  Tangible shareholders' equity to assets at
    period end...............................       6.36       6.45       6.06       6.52       6.27       6.55       6.47
  Return on average assets...................       1.06       0.95       0.95       0.92       0.87       0.71       0.76
  Return on average equity...................      17.09      14.62      15.07      14.40      13.54      10.90      12.08
  Average equity/average assets..............       6.21       6.48       6.27       6.40       6.40       6.51       6.33
  Net interest margin........................       5.54       5.59       5.51       5.56       5.68       5.51       5.21
</TABLE>
    
 
                                       29
<PAGE>
   
  SUMMARY WESTERN-BKLA-PENINSULA UNAUDITED PRO FORMA COMBINED FINANCIAL DATA
    
 
   
    The following table sets forth certain summary Western-BKLA-Peninsula
unaudited pro forma combined financial data for Western (after giving effect to
the Merger) and Peninsula, as if the Merger and the Peninsula Merger had
occurred as of the beginning of each of the periods presented. See
"SUMMARY--Proposed Peninsula Acquisition". This information should be read in
conjunction with the historical consolidated financial statements of Western,
BKLA and Peninsula including the notes thereto, appearing elsewhere in this
Proxy Statement-Prospectus or incorporated herein by reference. See
"WESTERN--BKLA--PENINSULA UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL DATA"
and "INCORPORATION OF CERTAIN INFORMATION BY REFERENCE".
    
 
   
    The unaudited pro forma combined condensed balance sheets are not
necessarily indicative of the actual financial position that would have existed
had the Merger and the Peninsula Merger been consummated on the dates indicated,
or that may exist in the future. The unaudited pro forma combined condensed
results of operations are not necessarily indicative of the results that would
have occurred had the Merger and the Peninsula Merger been consummated on the
dates indicated or that may be achieved in the future. Assuming the consummation
of the Merger and the Peninsula Merger, the actual financial position and
results of operations will differ, perhaps significantly, from the pro forma
amounts reflected herein because of a variety of factors, including changes in
value and changes in operating results between the dates of the unaudited pro
forma financial data and the dates on which the Merger and the Peninsula Merger
take place.
    
   
<TABLE>
<CAPTION>
                                            AT OR FOR THE SIX
                                               MONTHS ENDED                   AT OR FOR THE
                                             JUNE 30, (1,4,5)            YEARS ENDED DECEMBER 31,
                                          ----------------------  --------------------------------------
<S>                                       <C>         <C>         <C>         <C>          <C>
                                             1998        1997      1997(5)     1996(2)      1995(3,6,7)
                                          ----------  ----------  ----------  ----------   -------------
 
<CAPTION>
                                                  (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                       <C>         <C>         <C>         <C>          <C>
RESULTS OF OPERATIONS:
  Interest income.......................  $   97,983  $   90,516  $  189,473  $  108,843    $   91,191
  Interest expense......................      26,951      27,064      56,660      33,164        28,751
                                          ----------  ----------  ----------  ----------   -------------
      Net interest income...............      71,032      63,452     132,813      75,679        62,440
  Provision for loan and lease losses...         519       2,135       3,708       2,334         8,723
                                          ----------  ----------  ----------  ----------   -------------
      Net interest income after
        provision for loan and lease
        losses..........................      70,513      61,317     129,105      73,345        53,717
  Non-interest income...................      11,969      11,250      22,502      14,603        11,869
  Non-interest expense..................      52,772      57,359     124,258      69,371        64,499
                                          ----------  ----------  ----------  ----------   -------------
      Income before income taxes........      29,710      15,208      27,349      18,577         1,087
  Income tax expense (benefit)..........      14,056       8,245      15,656       5,533          (312)
                                          ----------  ----------  ----------  ----------   -------------
      Net income........................  $   15,654  $    6,963  $   11,693  $   13,044    $    1,399
                                          ----------  ----------  ----------  ----------   -------------
                                          ----------  ----------  ----------  ----------   -------------
      Comprehensive income..............  $   16,025  $    6,193  $   11,479  $   12,366    $    7,175
                                          ----------  ----------  ----------  ----------   -------------
                                          ----------  ----------  ----------  ----------   -------------
 
ENDING BALANCE SHEET DATA:
  Assets................................  $2,738,869  $1,929,375  $2,077,868  $1,813,438    $1,315,004
  Securities............................     424,432     430,763     392,988     439,924       303,007
  Loans and leases, net of deferred fees
    and unearned income.................   1,671,483   1,182,430   1,257,923   1,102,226       799,896
  Allowance for loan and lease losses...      29,806      19,409      21,071      19,589        17,341
  Goodwill..............................     151,029      33,828      36,369      34,630         5,864
  Deposits..............................   2,336,959   1,720,406   1,854,037   1,611,319     1,185,877
  Borrowed funds........................      29,229      20,640      15,200      22,732         9,668
  Common shareholders' equity...........     338,440     174,987     174,550     164,093       109,617
</TABLE>
    
 
   
                                       30
    
<PAGE>
 
   
<TABLE>
<CAPTION>
                                            AT OR FOR THE SIX
                                               MONTHS ENDED                   AT OR FOR THE
                                             JUNE 30, (1,4,5)            YEARS ENDED DECEMBER 31,
                                          ----------------------  --------------------------------------
                                             1998        1997      1997(5)     1996(2)      1995(3,6,7)
                                          ----------  ----------  ----------  ----------   -------------
                                                  (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                       <C>         <C>         <C>         <C>          <C>
PER SHARE DATA AND OTHER SELECTED
  RATIOS:
  Earnings (loss) per common and common
    equivalent share
    Basic...............................  $     0.77  $     0.36  $     0.60  $     1.12    $     0.15
    Diluted.............................        0.75        0.35        0.59        1.09          0.14
  Dividends declared per share(8).......        0.15      --            0.30      --           --
  Book value per share..................       16.52        8.54       11.35       10.67          7.80
  Tangible book value per share.........        9.15        6.89        8.98        8.42          7.39
  Shareholders' equity to assets at
    period end..........................       12.36%       9.07%       8.40%       9.05%         8.34%
  Tangible shareholders' equity to
    assets at period end................        7.24        7.45        6.77        7.28          7.93
  Return on average assets..............        1.15        0.55        0.44        0.90          0.12
  Return on average equity..............        9.23        4.38        3.60       10.40          1.47
  Average equity/average assets.........       12.41       12.53       12.24        8.64          7.89
  Net interest margin...................        6.11        5.96        5.95        5.86          5.82
</TABLE>
    
 
- ------------------------
 
   
(1) On January 27, 1998, Western acquired Santa Monica Bank in a transaction
    accounted for as a purchase. At January 31, 1998, Santa Monica Bank had
    approximately $671 million in assets, $388 million in net loans and $584
    million in deposits. At the time of the SMB Acquisition, Western issued
    approximately 2,653,000 shares of Western Common Stock to certain former
    shareholders of Santa Monica Bank and also paid approximately $114 million
    to the other former shareholders of Santa Monica Bank. Western also raised
    approximately $65 million in additional equity in a private placement by
    issuing 2,327,550 shares of Western Common Stock. Santa Monica Bank's
    results of operations are included only since January 27, 1998. Due to the
    relatively large size of this transaction, any comparison of data as of and
    for the six months ended June 30, 1998 to data as of or for prior dates or
    periods may not be meaningful.
    
 
   
(2) On September 30, 1996, Western acquired Western Bank in a transaction
    accounted for as a purchase. At September 30, 1996, Western Bank had
    approximately $410 million in assets, $198 million in net loans and $353
    million in deposits. At the time of such acquisition, Western also raised
    approximately $42 million in additional equity in a private placement by
    issuing 3,076,045 shares of Western Common Stock. Western Bank's results of
    operations are included only since the fourth quarter of fiscal 1996. Due to
    the relatively large size of this transaction, any comparison of data as of
    and for the year ended December 31, 1996 to data as of or for prior dates or
    periods may not be meaningful.
    
 
   
(3) In 1995, Western, through a private placement and a separate shareholders'
    rights and public offering, raised approximately $9 million in additional
    equity, net of approximately $470,000 in offering costs, in connection with
    the issuance of 874,589 shares of Western Common Stock. Also in 1995
    Western, through a private placement of 474,000 shares, raised approximately
    $3 million in additional equity in connection with the issuance of shares of
    Western Common Stock.
    
 
   
(4) On December 31, 1997, BKLA acquired CNB in a transaction accounted for as a
    purchase. At December 31, 1997, CNB had approximately $60 million in assets,
    $26 million in net loans and $51 million in deposits. At the time of such
    acquisition, BKLA issued 1,155,326 shares of BKLA Common Stock to former
    shareholders of CNB. CNB's results of operations are included only since
    January of fiscal 1998. Due to the relatively large size of this
    transaction, any comparison of data as of and for the six months ended June
    30, 1998 to data as of or for prior dates or periods may not be meaningful.
    
 
   
(5) On April 1, 1997, BKLA acquired AWB in a transaction accounted for as a
    purchase. At April 1, 1997, AWB had approximately $67 million in assets, $37
    million in net loans and $61 million in deposits. At the time of such
    acquisition, BKLA issued 1,367,493 shares of BKLA Common Stock to former
    shareholders of AWB. AWB's results of operations are included only since
    April of fiscal 1997. Due to the relatively large size of this transaction,
    any comparison of data as of and for the six months ended June 30, 1998 and
    the year ended December 31, 1997 to data as of or for prior dates or periods
    may not be meaningful.
    
 
                                       31
<PAGE>
   
(6) On November 15, 1995, BKLA acquired WTB in a transaction accounted for as a
    purchase. At November 15, 1995, WTB had approximately $42 million in assets,
    $21 million in net loans and $40 million in deposits. At the time of such
    acquisition, BKLA issued 346,325 shares of BKLA Common Stock to former
    shareholders of WTB. WTB's results of operations are included only since
    November of fiscal 1995.
    
 
   
(7) On March 31, 1995, BKLA received a capital infusion of approximately $3.4
    million for 946,352 shares of BKLA Common Stock and 473,176 warrants. On
    November 30, 1995 as a result of a rights offering to all shareholders of
    record at October 24, 1995, 651,325 shares of BKLA Common Stock and 217,160
    warrants were issued for net proceeds of approximately $2.1 million. Each
    warrant issued in both the capital infusion and the rights offering entitled
    the holder to purchase one share of BKLA Common Stock for $3.75 and will
    expire on December 1, 1998.
    
 
   
(8) A $0.15 dividend was declared in the fourth quarter of 1997 and was paid in
    the first quarter of 1998.
    
 
                                       32
<PAGE>
                                  RISK FACTORS
 
    IN ADDITION TO THE INFORMATION CONTAINED ELSEWHERE IN THIS PROXY
STATEMENT-PROSPECTUS OR INCORPORATED HEREIN BY REFERENCE, BKLA SHAREHOLDERS
CONSIDERING THE PROPOSAL TO APPROVE THE PRINCIPAL TERMS OF THE MERGER SHOULD
CAREFULLY CONSIDER THE FOLLOWING FACTORS, AMONG OTHERS, BEFORE MAKING ANY FINAL
DECISION.
 
FORWARD-LOOKING STATEMENTS MAY NOT PROVE ACCURATE
 
    When used or incorporated by reference in this Proxy Statement-Prospectus,
the words "anticipate", "estimate", "expect", "project", "believe" and similar
expressions are intended to identify forward-looking statements. Such statements
are subject to certain risks, uncertainties and assumptions including those set
forth below. Should one or more of these risks or uncertainties materialize, or
should underlying assumptions prove incorrect, actual results may vary
materially from those anticipated, estimated, expected or projected. Several key
factors that have a direct bearing on Western's ability to attain its goals are
discussed below.
 
COMPETITION
 
    The banking business in California generally, and in Western's and BKLA's
service areas in particular, is highly competitive with respect to both loans
and deposits and is dominated by a relatively small number of major financial
institutions that have many offices operating throughout wide geographic areas.
In addition, there are numerous other independent commercial banks and savings
associations within their primary service areas, many of which have greater
resources, greater capital and, in some cases, less stringent regulatory
limitations. Certain of Western's and BKLA's competitors may be better able to
respond to changing capital and other regulatory requirements and better able to
maintain or improve market share.
 
ABILITY TO INTEGRATE THE OPERATIONS OF WESTERN AND BKLA; RAPID GROWTH
 
   
    Because the markets in which Western, Santa Monica Bank and BKLA operate are
highly competitive and because of the inherent uncertainties associated with
merging two companies, there can be no assurance that the Surviving Corporation
will be able to realize fully the operating efficiencies Western currently
expects to realize as a result of the Merger and the consolidation of the
administrative operations of BKLA and Santa Monica Bank or that such operating
efficiencies will be realized in the time frame currently anticipated. See "THE
MERGER--Background and Reasons for the Merger".
    
 
   
    Western has experienced rapid growth in total assets, primarily due to
several recent, significant acquisitions. In the first of such acquisitions,
Western acquired Western Bank on September 30, 1996, thereby increasing its
total assets as of September 30, 1996, from approximately $80 million to
approximately $490 million, an increase of 513%. In June 1997, Western merged
with CCB, thereby acquiring NBSC and increasing Western's total assets from
approximately $512 million at December 31, 1996 to approximately $860 million at
June 30, 1997, an increase of 68%. As a result of the SCB Merger, which was
consummated on October 10, 1997, Western's total assets increased from
approximately $867 million at September 30, 1997 to $1.38 billion at December
31, 1997, an increase of 60%. Following the SMB Acquisition, as of March 31,
1998, Western's total assets increased to $2.08 billion, an increase of
approximately $700 million or 51% from $1.38 billion at December 31, 1997.
Assuming the consummation of the BKLA Acquisition, Western would add
approximately $280 million of additional assets. In addition, on July 24, 1998
Western entered into a definitive agreement with Peninsula pursuant to which
Western will, subject to the satisfaction of customary conditions, acquire
Peninsula in late fourth quarter 1998 or early first quarter 1999. Assuming
consummation of the Peninsula Acquisition, Western would add approximately $428
million in additional assets. The ability of Western to operate effectively
following this rapid growth will depend in part on its ability to integrate the
operations of the recently acquired entities and its ability to attract and
retain key personnel. If the integration of Western Bank, CCB, SCB, Santa
    
 
                                       33
<PAGE>
   
Monica Bank, BKLA and Peninsula does not proceed as anticipated, the results of
operations of Western could be adversely affected. Also, there can be no
assurance that Western will be able to realize the operating efficiencies that
Western Management expects to achieve through the acquisition of Western Bank,
the CCB Merger, the SCB Merger, the SMB Acquisition, the Merger and the
Peninsula Acquisition.
    
 
    In addition, due to the substantial size of these acquisitions, any
comparison of financial data as of and for the time periods prior to such
acquisitions may not be meaningful.
 
GENERAL BUSINESS RISK
 
   
    The businesses of Western and BKLA are subject to various business risks.
The volume of loan originations is dependent upon demand for loans of the type
originated and serviced by Western and BKLA and the competition in the
marketplace for such loans. The level of consumer confidence, fluctuations in
real estate values, fluctuations in prevailing interest rates and fluctuations
in investment returns expected by the financial community could combine to make
loans of the type originated by Western and BKLA less attractive. In addition,
Western and BKLA may be adversely affected by other factors that could (a)
increase the cost to the borrower of loans originated by Western and BKLA, (b)
create alternative lending sources for such borrowers, or (c) increase the cost
of funds of Western and BKLA at rates faster than any increase in interest
income, thereby narrowing their net interest rate margins. Although both Western
and BKLA also have seen continued improvement in loan demand consistent with
overall market growth during the continued recovery of the Southern California
economy, the increase in demand to date has not been sufficient to permit either
Western or BKLA to utilize fully deposits to fund loans, and accordingly each
has maintained a significant portion of its funds in securities and federal
funds sold. In addition, competition for loans has increased and some lenders
have shown a willingness to lend on terms that Western and BKLA Managements are
unwilling to match due to their credit philosophies. Managements of both Western
and BKLA believe that loan demand will continue to improve, but there can be no
assurance that there will be sufficient loan demand in the future to keep pace
with the level of deposits such that the asset mix desired by Western and BKLA
can be achieved and maintained. Governmental interventions through elimination
of tax benefits for home equity loans, regulation of an increased scope of loans
or introduction of additional regulations aimed at mortgage loans could also
adversely affect the business in which Western and BKLA are engaged.
    
 
   
    In the ordinary course of business, Western and BKLA are subject to claims
made against them by borrowers, depositors and investors arising from, among
other things, losses that are claimed to have been incurred as a result of (a)
alleged breaches of fiduciary obligation, (b) alleged misrepresentations, errors
or omissions by employees and officers (including appraisers), (c) alleged
incomplete documentation, or (d) alleged failure by Western or BKLA to comply
with applicable laws and regulations. Western believes that any liability with
respect to any currently asserted claims or legal actions against Western or
BKLA is not likely to be material to the consolidated financial position or
results of operations of Western or SMB; however, any claims asserted in the
future may result in legal expense or liabilities that could have a material
adverse effect on the financial positions and results of operations of Western
or SMB.
    
 
CONCENTRATION OF OPERATIONS; RECESSIONARY ENVIRONMENTS; DECLINE IN REAL ESTATE
  VALUES
 
    The business activities of Western and BKLA currently are focused in
Southern California, with the majority of their business concentrated in Los
Angeles and Orange counties. The business of Western after the Merger is
expected to continue to be concentrated in Southern California for the
foreseeable future. Although Western intends to expand within Southern
California, there can be no assurance when or if such expansion will take place.
Consequently, the results of operations and financial condition of Western and
BKLA are dependent upon general trends in the Los Angeles County, Orange County
and Southern California economies and residential and commercial real estate
markets. The risks to which the business of Western and BKLA is subject, and to
which the business of Western after the Merger will be subject, become more
acute during an economic slow-down or recession such as that experienced during
the recent
 
                                       34
<PAGE>
   
California recession. During such periods, delinquencies and foreclosures
generally increase and can result in increased numbers of, and larger, claims
and legal actions and in a decline in demand for the services provided by
Western and BKLA. In addition, a significant decline in market values of
properties of the type that secure loans originated by Western and BKLA would
reduce homeowners' equity in their homes and businesses' equity in their
properties, thereby reducing their borrowing power and also weakening collateral
coverage on loans made previously by Western and BKLA. Such a decline could also
diminish the market for loans originated by Western and BKLA. Any of the
foregoing could have a material adverse effect on the financial position and
results of operations of Western and SMB, and could have a greater adverse
impact on Western and SMB than on certain competitors that may have greater
resources and capital. In addition, the concentration of Western's operations in
Los Angeles and Orange counties exposes it to greater risk than other banking
companies with a wider geographic base in the event of catastrophes, such as
earthquakes, fires and floods, in this region.
    
 
INTEREST RATE RISK
 
   
    It is expected that Western, through its subsidiaries including SMB, will
continue to realize income primarily from the differential or "spread" between
the interest earned on loans, securities and other interest-earning assets, and
interest paid on deposits, borrowings and other interest-bearing liabilities.
Net interest spreads are affected by the difference between the maturities and
repricing characteristics of interest-earning assets and interest-bearing
liabilities. In addition, loan volume and yields are affected by market interest
rates on loans, and rising interest rates generally are associated with a lower
volume of loan originations. There can be no assurance that Western's interest
rate risk will be minimized or eliminated. In addition, an increase in the
general level of interest rates may adversely affect the ability of certain
borrowers to pay the interest on and principal of their obligations.
Accordingly, changes in levels of market interest rates could materially
adversely affect Western's net interest spread, asset quality, loan origination
volume and overall results of operation.
    
 
SHARES ELIGIBLE FOR FUTURE SALE; DILUTION
 
    Shares of Western Common Stock eligible for future sale could have a
dilutive effect on the market for Western Common Stock and could adversely
affect market prices.
 
   
    As of the BKLA Record Date, the Restated Articles of Incorporation of
Western authorized 100,000,000 shares of Western Common Stock, of which
15,704,753 shares were outstanding. Approximately 2,156,468 additional shares of
Western Common Stock will be issued in the Merger to BKLA Shareholders, assuming
(i) no shares of BKLA Common Stock reserved for issuance on the BKLA Record Date
are issued on or prior to the Effective Date; (ii) no Dissenters' Rights are
perfected by BKLA Shareholders; and (iii) no cash is paid in lieu of fractional
shares. Approximately 2,425,033 additional shares of BKLA Common Stock will be
issued in the Merger to BKLA Shareholders assuming (i) all shares of BKLA Common
Stock reserved for issuance on the BKLA Record Date are issued and outstanding
on the Effective Date; (ii) no Dissenters Rights are perfected by BKLA
Shareholders; and (iii) no cash is paid in lieu of fractional shares. Pursuant
to its stock option plans, Western had outstanding options to purchase an
additional 404,973 shares of Western Common Stock on the BKLA Record Date with
exercise prices of between $5.25 and $43.00. Western also had outstanding
warrants to purchase an additional 140,675 shares of Western Common Stock with
exercise prices of between $13.77 and $16.83. As of the BKLA Record Date, BKLA
had no additional options authorized under its stock option plan, and
outstanding options to purchase 322,850 shares of BKLA Common Stock with
exercise prices of between $3.75 and $44.30. BKLA also had outstanding warrants
to purchase an additional 506,974 shares of BKLA Common Stock with an exercise
price of $3.75.
    
 
    It is Western's intention to pursue acquisitions of other financial
institutions from time to time where such acquisitions are believed by Western
to enhance shareholder value or satisfy other strategic objectives. Such
acquisitions, if any, could be accomplished by the issuance of additional shares
of Western Common
 
                                       35
<PAGE>
   
Stock or other securities convertible into or exercisable for Western Common
Stock. See "UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL DATA" and
"WESTERN--BKLA--PENINSULA PRO FORMA COMBINED CONDENSED FINANCIAL DATA".
    
 
   
    In addition, in an action pending in the United States District Court for
the Central District of California, Financial Institution Partners, L.P. and
Hovde Capital, Inc., as a purported assignee of Financial Institution Partners,
L.P. (collectively "FIP"), have asserted an alleged contractual right to
purchase 266,659 additional shares of common stock of CCB at a price of $6.75
per share and to an ongoing right of first refusal to maintain FIP's beneficial
ownership interest in CCB and/or Western. In an order dated June 30, 1998, the
Court dismissed FIP's claims to an ongoing right of first refusal in CCB and/ or
Western stock. Western Management considers FIP's remaining claims for damages
based upon the 266,659 additional shares of CCB common stock that FIP did not
purchase to be without merit.
    
 
REGULATION
 
   
    The operations of Western and BKLA are subject to extensive regulation by
federal, state and local governmental authorities and are subject to various
laws and judicial and administrative decisions imposing requirements and
restrictions on part or all of their respective operations. Western and BKLA
each believes that it is in substantial compliance in all material respects with
applicable federal, state and local laws, rules and regulations. Because the
business of each of Western and BKLA is highly regulated, the laws, rules and
regulations applicable to Western and BKLA are subject to regular modification
and change. There are currently proposed various laws, rules and regulations
that, if adopted, would impact Western and SMB. There can be no assurance that
these proposed laws, rules and regulations, or other such laws, rules or
regulations, will not be adopted in the future, which could make compliance much
more difficult or expensive, restrict Western and BKLA's ability to originate,
broker or sell loans, further limit or restrict the amount of commissions,
interest or other charges earned on loans originated or sold by Western or BKLA
or otherwise adversely affect the business or prospects of Western or BKLA.
    
 
LIMITED MARKET FOR WESTERN COMMON STOCK
 
   
    There is currently only a limited trading market for Western Common Stock.
Western Common Stock was designated for quotation on Nasdaq on June 3, 1997.
There can be no assurance that an active trading market for Western Common Stock
will develop, or if developed, will continue, or that shareholders of Western
after the Merger will be able to resell their securities or otherwise liquidate
their investment, if at all, without considerable delay or considerable impact
on the sales price. See "SUMMARY--Markets and Market Prices".
    
 
    There can be no assurance as to the market value of Western Common Stock,
which market value may be significantly affected by various factors, including
but not limited to announcements of expanded services by Western or its
competitors, acquisitions of related companies and variations in quarterly
operating results, as well as by the dilutive effects of the matters described
above in "--Shares Eligible for Future Sale; Dilution". The limited trading
market for Western Common Stock may cause fluctuations in the market value of
Western Common Stock to be exaggerated, leading to price volatility in excess of
that which would occur in a more active trading market.
 
   
YEAR 2000 RISKS AND PREPAREDNESS
    
 
   
    Many existing computer programs use only two digits to identify a year in a
data field. These programs were designed and developed without considering the
impact of the upcoming change in the century. If not corrected, many computer
applications could fail or create erroneous results by or at the Year 2000 or
possibly earlier. The Year 2000 issue affects Western in that the financial
services business is highly dependent on computer applications in a variety of
ways, including the following: (i) Western relies on computer systems in almost
all aspects of its business, including the processing of deposits, loans and
other
    
 
                                       36
<PAGE>
   
services and products offered to customers, the failure of which in connection
with the Year 2000 could cause systemic disruptions and failures in the products
and services offered by Western; (ii) other banks, clearing houses, and vendors
whose products and services Western uses are at risk of systemic disruptions and
potential failures in the event that such entities have not adequately addressed
their Year 2000 issues prior to the Year 2000; (iii) the creditworthiness of
borrowers of Western might be diminished by significant disruptions of their
business as a result of their own or others' failure to address adequately the
Year 2000 issue prior to the Year 2000; and (iv) federal banking agencies have
issued interagency guidance on the business-wide risk posed to financial
institutions by the Year 2000 problem pursuant to which the federal banking
agencies may take supervisory action against financial institutions that fail to
address appropriately Year 2000 issues prior to the Year 2000, including formal
and informal enforcement actions, denial of applications to the federal banking
agencies, civil money penalties, and a reduction in the management component
rating of the institution's composite rating.
    
 
   
    In order to address the Year 2000 issues facing Western, Western Management
has initiated a program to prepare Western's computer systems and applications
for the Year 2000 (the "Year 2000 Plan"). The primary focus of the Year 2000
Plan is to convert each of Western's subsidiary banks to the target systems
identified and believed to be Year 2000 compliant. Western expects to incur
internal staff costs as well as consulting and other expenses related to
infrastructure and facilities enhancements necessary to prepare for conversion
and Year 2000 system preparations. Testing and conversion of primary system
applications and hardware is expected to cost approximately $1,100,000, to be
expended during fiscal years 1998 and 1999. This cost estimate does not include
costs associated with infrastructure and facilities enhancements required in
connection with operational consolidations due to the CCB Merger, the SCB
Merger, the SMB Acquisition, the Merger and the Peninsula Acquisition. A
significant portion of the cost to Western in connection with becoming Year 2000
compliant is expected to be the redeployment of existing technology and
operations resources rather than incremental costs to Western.
    
 
   
    As a part of the Year 2000 Plan, Western is not only undertaking the
infrastructure and facilities enhancement and testing necessary to ensure that
Western is adequately prepared for the Year 2000, but also Western is
communicating with its vendors upon whose services Western relies to ensure Year
2000 compliance. Pursuant to the Year 2000 Plan, Western expects to
substantially complete testing of its mission-critical systems and the
computer-related interactive vendor systems by December 31, 1998 and to complete
all testing by June 1999. In addition, as part of the credit review process,
Western is communicating with its major borrowers in an effort to ensure that
such borrowers have taken appropriate steps to address their Year 2000 issues
and will not be materially affected by any Year 2000 problems. Western is
communicating with its major deposit customers as well. Western also is
preparing contingency plans to protect Western in the event that Western is
unable to attain Year 2000 compliance in certain applications according to the
Year 2000 Plan.
    
 
   
    Although Western believes that its Year 2000 Plan and other steps being
taken are adequate to ensure that it will not be materially affected by the Year
2000 problem, there can be no assurance that the Year 2000 Plan and Western's
other Year 2000 remedial and contingency plans will fully protect Western from
the risks associated with the Year 2000. The analysis of, and preparation for,
the Year 2000 and related problems necessarily rely on a variety of assumptions
about future events, and there can be no assurance that Western Management has
accurately predicted such future events or that the remedial and contingency
plans of Western will adequately address such future events. In the event that
the business of any of Western, vendors of Western or customers of Western is
disrupted as a result of the Year 2000 problem, such disruption could have a
material adverse effect on Western.
    
 
                                       37
<PAGE>
                         INFORMATION REGARDING WESTERN
 
BUSINESS OF WESTERN
 
   
    Western is a bank holding company registered under the BHCA, and its
principal business is to serve as a holding company for its banking
subsidiaries, SCB and Santa Monica Bank. Western was organized on May 20, 1983
as a California corporation and commenced operation as a bank holding company on
June 18, 1984. Western Bank was acquired by Western on September 30, 1996. On
June 4, 1997, Western consummated the CCB Merger pursuant to which CCB merged
with and into Western. Also on June 4, 1997, Monarch Bank, a wholly-owned
subsidiary of Western prior to the CCB Merger, and merged with and into NBSC, a
wholly-owned subsidiary of CCB prior to the CCB Merger. On October 10, 1997,
Western consummated the SCB Merger pursuant to which SCB merged with and into
Western. On December 15, 1997, Western merged NBSC with and into SCB, a
wholly-owned subsidiary of SC Bancorp prior to the SCB Merger, with SCB being
the surviving bank. On January 27, 1998, Western consummated the SMB Acquisition
pursuant to which Santa Monica Bank merged with and into Western Bank with
Western Bank being the surviving bank. As part of the SMB Acquisition, the name
of Western Bank was changed to "Santa Monica Bank".
    
 
   
    Santa Monica Bank's primary market area is the western part of Los Angeles
County. As of June 30, 1998 Santa Monica Bank had thirteen branch offices,
including branch offices in Santa Monica, Westwood, Malibu, Pacific Palisades,
Marina Del Rey, Beverly Hills, Century City and Encino. SCB's primary market
area includes southern Los Angeles County, Orange County and northern San Diego
County. As of June 30, 1998 SCB had six branch offices in southern Los Angeles
County, nine branch offices throughout Orange County and one in northern San
Diego County. Santa Monica Bank and SCB offer a broad range of banking products
and services, including many types of business and personal savings and checking
accounts and other consumer banking services. At June 30, 1998, Western had
consolidated total assets, total deposits and shareholders' equity of $2.0
billion, $1.7 billion and $289 million, respectively.
    
 
    Western's principal executive offices are located at 4100 Newport Place,
Suite 900, Newport Beach, California 92660, and its telephone number is (949)
863-2444.
 
QUARTERLY DIVIDEND
 
    On May 20, 1998, the Western Board declared a dividend of $0.15 per share of
Western Common Stock payable on June 26, 1998 to Western Shareholders of record
on June 5, 1998.
 
INCORPORATION OF CERTAIN INFORMATION BY REFERENCE
 
    Additional information relating to Western, including information relating
to the business, management, properties, financial condition and results of
operations of Western, is included in documents incorporated by reference into
this Proxy Statement-Prospectus. See "AVAILABLE INFORMATION" and "INCORPORATION
OF CERTAIN INFORMATION BY REFERENCE".
 
                                       38
<PAGE>
                           INFORMATION REGARDING BKLA
 
BUSINESS OF BKLA
 
   
    BKLA was organized on May 8, 1981 as a California corporation and commenced
operations pursuant to a charter issued by the State Commissioner on May 6,
1982. On November 15, 1995, BKLA acquired WTB, with total assets of
approximately $42,487,000 and one banking office. Effective April 1, 1997, BKLA
consummated a merger with AWB, with approximately $67,291,000 in assets and two
banking offices. On December 31, 1997, BKLA consummated its merger with CNB, a
national banking corporation with approximately $60,277,000 in total assets and
one branch office, with BKLA being the surviving corporation.
    
 
   
    BKLA is a full-service community bank which engages in general commercial
banking in Los Angeles County, California. As of June 30, 1998 BKLA had six
branch offices in the cities of Beverly Hills, West Hollywood, Encino, Culver
City and Glendale. Services include those traditionally offered by commercial
banks, such as checking and saving accounts and commercial and real estate
loans, and, for its business customers, personal, home improvement, automobile
and other installment loans. The vast majority of BKLA's loans are direct loans
made to individuals, professionals, real estate developers, and small and medium
sized businesses within BKLA's marketing area.
    
 
   
    BKLA's principal executive offices are located at 8901 Santa Monica
Boulevard, West Hollywood, California 90069 and its telephone number is (310)
550-8900.
    
 
INCORPORATION OF CERTAIN INFORMATION BY REFERENCE
 
    Additional information relating to BKLA, including information relating to
the business, management, properties, financial condition and results of
operations of BKLA, is included in documents incorporated by reference into this
Proxy Statement-Prospectus. See "AVAILABLE INFORMATION" and "INCORPORATION OF
CERTAIN INFORMATION BY REFERENCE".
 
                                       39
<PAGE>
             UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL DATA
 
   
    The following unaudited pro forma combined condensed financial data combines
the historical consolidated condensed financial statements of Western and the
historical consolidated condensed financial statements of BKLA, giving effect to
the Merger as if it had been effective on June 30, 1998 and December 31, 1997,
with respect to the Pro Forma Combined Condensed Balance Sheets, and as of the
beginning of the periods indicated, with respect to the Pro Forma Combined
Condensed Statements of Income. This information is presented under
pooling-of-interests accounting. The unaudited pro forma combined condensed
financial data also combines the historical condensed statements of income of
Santa Monica Bank, acquired by Western on January 27, 1998, in a merger
accounted for under the purchase method of accounting, for the year ended
December 31, 1997 and the six months ended June 30, 1998 and 1997, as if the SMB
Acquisition occurred at the beginning of such periods. The information for the
six months ended June 30, 1998 and 1997 is derived from the unaudited financial
statements of Western, BKLA and Santa Monica Bank which includes, in the opinion
of the managements of Western, BKLA and Santa Monica Bank, all adjustments
(consisting only of normal accruals) necessary to present fairly the data for
such periods. This information should be read in conjunction with the historical
consolidated financial statements of Western, BKLA and Santa Monica Bank,
including their respective notes thereto, which are included and incorporated by
reference into this Proxy Statement-Prospectus, and in conjunction with the
combined condensed historical selected financial data and other pro forma
combined financial information, including the notes thereto, appearing elsewhere
in this Proxy Statement-Prospectus. See "INCORPORATION OF CERTAIN INFORMATION BY
REFERENCE". The effect of estimated merger and reorganization costs expected to
be incurred in connection with the Merger has been reflected in the Unaudited
Pro Forma Combined Condensed Balance Sheets; however, since the estimated costs
are nonrecurring, they have not been reflected in the Unaudited Pro Forma
Combined Condensed Statements of Income. See Note 2 to the UNAUDITED PRO FORMA
COMBINED CONDENSED FINANCIAL DATA. The unaudited pro forma combined condensed
data does not give effect to any anticipated operating efficiencies in
conjunction with the Merger. The Unaudited Pro Forma Combined Condensed Balance
Sheets are not necessarily indicative of the actual financial position that
would have existed had the Merger been consummated on June 30, 1998 or December
31, 1997, or that may exist in the future. The Unaudited Pro Forma Combined
Condensed Statements of Income are not necessarily indicative of the results
that would have occurred had the Merger been consummated on the dates indicated
or that may be achieved in the future. Assuming the consummation of the Merger,
the actual financial position and results of operations will differ, perhaps
significantly, from the pro forma amounts reflected herein because of a variety
of factors, including changes in value and changes in operating results between
the dates of the unaudited pro forma financial data and the date on which the
Merger takes place.
    
 
                                       40
<PAGE>
   
            UNAUDITED PRO FORMA COMBINED CONDENSED BALANCE SHEET AT
                                 JUNE 30, 1998
    
 
   
<TABLE>
<CAPTION>
                                                                                                       WESTERN
                                                          WESTERN         BKLA         PRO FORMA       AND BKLA
                                                        (HISTORICAL)  (HISTORICAL)(1) ADJUSTMENTS(2)  PRO FORMA
                                                        ------------  -------------  --------------  ------------
<S>                                                     <C>           <C>            <C>             <C>
                                                                  (IN THOUSANDS, EXCEPT PER SHARE DATA)
ASSETS:
Cash and due from banks...............................  $    155,940   $    20,682     $   --        $    176,622
Federal funds sold....................................       177,329        14,000         --             191,329
                                                        ------------  -------------       -------    ------------
    TOTAL CASH AND CASH EQUIVALENTS...................       333,269        34,682         --             367,951
 
Federal Reserve Bank and Federal Home Loan Bank stock,
  at cost.............................................         5,759         1,491         --               7,250
Securities held to maturity...........................       --             87,188         --              87,188
Securities available for sale.........................       218,376       --              --             218,376
                                                        ------------  -------------       -------    ------------
    TOTAL SECURITIES..................................       224,135        88,679         --             312,814
 
Net loans.............................................     1,249,930       150,962         --           1,400,892
Property, plant and equipment.........................        32,034         2,519         --              34,553
Other real estate owned...............................         4,946         1,545         --               6,491
Goodwill..............................................       145,525         5,504         --             151,029
Other assets..........................................        26,910         5,877          1,680          34,467
                                                        ------------  -------------       -------    ------------
    TOTAL ASSETS......................................  $  2,016,749   $   289,768     $    1,680    $  2,308,197
                                                        ------------  -------------       -------    ------------
                                                        ------------  -------------       -------    ------------
 
LIABILITIES AND SHAREHOLDERS' EQUITY
 
LIABILITIES:
Non-interest bearing deposits.........................  $    637,837   $    86,876     $   --        $    724,713
Interest bearing deposits.............................     1,059,515       155,676         --           1,215,191
                                                        ------------  -------------       -------    ------------
    TOTAL DEPOSITS....................................     1,697,352       242,552         --           1,939,904
Borrowed funds........................................        15,756        12,873         --              28,629
Accrued interest payable and other liabilities........        14,495           792          7,080          22,367
                                                        ------------  -------------       -------    ------------
    TOTAL LIABILITIES.................................     1,727,603       256,217          7,080       1,990,900
 
SHAREHOLDERS' EQUITY:
Preferred stock.......................................       --            --              --             --
Common stock and additional paid in capital...........       263,257        31,042         --             294,299
Retained earnings.....................................        25,819         2,509         (5,400)         22,928
Other comprehensive income............................            70       --              --                  70
                                                        ------------  -------------       -------    ------------
    TOTAL SHAREHOLDERS' EQUITY........................       289,146        33,551         (5,400)        317,297
                                                        ------------  -------------       -------    ------------
    TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY........  $  2,016,749   $   289,768     $    1,680    $  2,308,197
                                                        ------------  -------------       -------    ------------
                                                        ------------  -------------       -------    ------------
 
Number of common shares outstanding(1)................      15,703.8       4,856.2                       17,843.4
Common shareholders' equity per share(1)..............  $      18.41   $      6.91                   $      17.78
Tangible common shareholders' equity per share(1).....  $       9.15   $      5.78                   $       9.32
</TABLE>
    
 
     See "NOTES TO UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL DATA".
 
                                       41
<PAGE>
            UNAUDITED PRO FORMA COMBINED CONDENSED BALANCE SHEET AT
                               DECEMBER 31, 1997
 
   
<TABLE>
<CAPTION>
                                                                                                     WESTERN AND
                                                          WESTERN         BKLA         PRO FORMA       BKLA PRO
                                                        (HISTORICAL)  (HISTORICAL)(1) ADJUSTMENTS(2)    FORMA
                                                        ------------  -------------  --------------  ------------
                                                                  (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                     <C>           <C>            <C>             <C>
ASSETS:
 
Cash and due from banks...............................  $     97,456   $    22,646     $   --        $    120,102
Federal funds sold....................................       138,702        29,555         --             168,257
                                                        ------------  -------------       -------    ------------
  TOTAL CASH AND CASH EQUIVALENTS.....................       236,158        52,201         --             288,359
 
Federal Reserve Bank and Federal Home Loan
  Bank stock, at cost.................................         5,610           801         --               6,411
Securities held to maturity...........................       --             48,138         --              48,138
Securities available for sale.........................       201,904        11,494         --             213,398
                                                        ------------  -------------       -------    ------------
  TOTAL SECURITIES....................................       207,514        60,433         --             267,947
 
Net loans.............................................       864,840       139,814         --           1,004,654
Property, plant and equipment.........................        13,685         2,650         --              16,335
Other real estate owned...............................         6,261         1,475         --               7,736
Goodwill..............................................        30,430         5,939         --              36,369
Other assets..........................................        24,622         9,521          1,680          35,823
                                                        ------------  -------------       -------    ------------
  TOTAL ASSETS........................................  $  1,383,510   $   272,033     $    1,680    $  1,657,223
                                                        ------------  -------------       -------    ------------
                                                        ------------  -------------       -------    ------------
 
LIABILITIES AND SHAREHOLDERS' EQUITY
 
LIABILITIES:
Non-interest bearing deposits.........................  $    457,503   $    85,222     $   --        $    542,725
Interest bearing deposits.............................       769,290       152,790         --             922,080
                                                        ------------  -------------       -------    ------------
  TOTAL DEPOSITS......................................     1,226,793       238,012         --           1,464,805
Borrowed funds........................................        12,751         1,849         --              14,600
Accrued interest payable and other liabilities........        14,311         1,118          7,080          22,509
                                                        ------------  -------------       -------    ------------
  TOTAL LIABILITIES...................................     1,253,855       240,979          7,080       1,501,914
 
SHAREHOLDERS' EQUITY:
Preferred stock.......................................       --            --              --             --
Common stock..........................................       112,947        30,630         --             143,577
Retained earnings.....................................        16,802           472         (5,400)         11,874
Other comprehensive income (loss).....................           (94)          (48)        --                (142)
                                                        ------------  -------------       -------    ------------
  TOTAL SHAREHOLDERS' EQUITY..........................       129,655        31,054         (5,400)        155,309
                                                        ------------  -------------       -------    ------------
  TOTAL LIABILITIES & SHAREHOLDERS' EQUITY............  $  1,383,510   $   272,033     $    1,680    $  1,657,223
                                                        ------------  -------------       -------    ------------
                                                        ------------  -------------       -------    ------------
 
Number of common shares outstanding(1)................      10,648.3       4,751.7                       12,744.4
Common shareholders' equity per share(1)..............  $      12.18   $      6.54                   $      12.19
Tangible book value per share(1)......................  $       9.32   $      5.29                   $       9.33
</TABLE>
    
 
     See "NOTES TO UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL DATA".
 
                                       42
<PAGE>
   
            UNAUDITED PRO FORMA COMBINED CONDENSED INCOME STATEMENT
                     FOR THE SIX MONTHS ENDED JUNE 30, 1998
    
 
   
<TABLE>
<CAPTION>
                                                                                 SANTA MONICA                        WESTERN
                                          WESTERN        BKLA         WESTERN       JANUARY         PRO FORMA       AND BKLA
                                        (HISTORICAL) (HISTORICAL)(1)  AND BKLA   (HISTORICAL)(3)  ADJUSTMENTS(3)    PRO FORMA
                                        -----------  -------------  -----------  -------------  -----------------  -----------
<S>                                     <C>          <C>            <C>          <C>            <C>                <C>
                                                                (IN THOUSANDS, EXCEPT PER SHARE DATA)
INTEREST INCOME:
  Interest and fees on loans and
    leases............................   $  56,671     $   7,667     $  64,338     $   3,185        $  --           $  67,523
  Interest on interest bearing
    deposits in other banks...........      --                38            38        --               --                  38
  Interest on investment securities...       6,966         2,071         9,037           616           --               9,653
  Interest on federal funds sold......       5,285           729         6,014           365             (235)          6,144
                                        -----------  -------------  -----------  -------------          -----      -----------
    TOTAL INTEREST INCOME.............      68,922        10,505        79,427         4,166             (235)         83,358
 
INTEREST EXPENSE:
  Interest expense on deposits........      17,762         2,718        20,480         1,180           --              21,660
  Interest expense on borrowings......         556           290           846            16           --                 862
                                        -----------  -------------  -----------  -------------          -----      -----------
    TOTAL INTEREST EXPENSE............      18,318         3,008        21,326         1,196           --              22,522
                                        -----------  -------------  -----------  -------------          -----      -----------
 
NET INTEREST INCOME:..................      50,604         7,497        58,101         2,970             (235)         60,836
  Less: provision for loan and lease
    losses............................         300        --               300            80           --                 380
                                        -----------  -------------  -----------  -------------          -----      -----------
    NET INTEREST INCOME AFTER
      PROVISION FOR LOAN AND LEASE
      LOSSES..........................      50,304         7,497        57,801         2,890             (235)         60,456
 
NON-INTEREST INCOME:
  Service charges, commissions and
    fees..............................       7,250           955         8,205           595           --               8,800
  Securities gains....................         155            49           204        --               --                 204
  Other income........................         453            26           479            19           --                 498
                                        -----------  -------------  -----------  -------------          -----      -----------
    TOTAL NON-INTEREST INCOME.........       7,858         1,030         8,888           614           --               9,502
 
NON-INTEREST EXPENSE:
  Salaries and benefits...............      17,725         2,770        20,495         1,123              (11)         21,607
  Occupancy, furniture and
    equipment.........................       5,328         1,033         6,361           347               23           6,731
  Advertising and business
    development.......................         566            98           664            58           --                 722
  Other real estate owned.............        (205)           12          (193)            9           --                (184)
  Professional services...............       1,657           362         2,019            73           --               2,092
  Telephone, stationery and
    supplies..........................       1,437           256         1,693            55           --               1,748
  Goodwill amortization...............       4,561           237         4,798        --                  665           5,463
  Data processing.....................       1,126        --             1,126             9           --               1,135
  Customer services cost..............         842        --               842             8           --                 850
  Merger costs........................      --            --            --               429           --                 429
  Other...............................       2,476           506         2,982           239           --               3,221
                                        -----------  -------------  -----------  -------------          -----      -----------
    TOTAL NON-INTEREST EXPENSE........      35,513         5,274        40,787         2,350              677          43,814
                                        -----------  -------------  -----------  -------------          -----      -----------
Income before income taxes............      22,649         3,253        25,902         1,154             (912)         26,144
Income taxes..........................      11,142         1,216        12,358           463             (102)         12,719
                                        -----------  -------------  -----------  -------------          -----      -----------
    NET INCOME........................   $  11,507     $   2,037     $  13,544     $     691        $    (810)      $  13,425
                                        -----------  -------------  -----------  -------------          -----      -----------
                                        -----------  -------------  -----------  -------------          -----      -----------
 
PER SHARE INFORMATION(1):
  Number of shares (weighted average)
    Basic.............................    14,821.5       4,776.6      16,839.1       7,084.2                         17,668.1
    Diluted...........................    15,040.0       5,368.8      17,307.8       7,084.2                         18,136.8
  Income per share
    Basic.............................   $    0.78     $    0.43     $    0.80     $    0.10                        $    0.76
    Diluted...........................   $    0.77     $    0.38     $    0.78     $    0.10                        $    0.74
</TABLE>
    
 
     See "NOTES TO UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL DATA".
 
                                       43
<PAGE>
   
            UNAUDITED PRO FORMA COMBINED CONDENSED INCOME STATEMENT
                     FOR THE SIX MONTHS ENDED JUNE 30, 1997
    
 
   
<TABLE>
<CAPTION>
                                                                                                                    WESTERN
                                           WESTERN        BKLA         WESTERN    SANTA MONICA      PRO FORMA      AND BKLA
                                         (HISTORICAL) (HISTORICAL)(1)  AND BKLA   (HISTORICAL)(3) ADJUSTMENTS(3)   PRO FORMA
                                         -----------  -------------  -----------  -------------  ---------------  -----------
<S>                                      <C>          <C>            <C>          <C>            <C>              <C>
                                                                (IN THOUSANDS, EXCEPT PER SHARE DATA)
INTEREST INCOME:
  Interest and fees on loans and
    leases.............................   $  38,605     $   5,021     $  43,626     $  18,106       $  --          $  61,732
  Interest on interest bearing deposits
    in other banks.....................      --                 1             1        --              --                  1
  Interest on investment securities....       8,500         1,139         9,639         4,030          --             13,669
  Interest on federal funds sold.......       1,653           490         2,143         1,680          (1,408)         2,415
                                         -----------  -------------  -----------  -------------       -------     -----------
    TOTAL INTEREST INCOME..............      48,758         6,651        55,409        23,816          (1,408)        77,817
 
INTEREST EXPENSE:
  Interest expense on deposits.........      13,736         1,617        15,353         6,898          --             22,251
  Interest expense on borrowings.......         594           129           723            98          --                821
                                         -----------  -------------  -----------  -------------       -------     -----------
    TOTAL INTEREST EXPENSE.............      14,330         1,746        16,076         6,996          --             23,072
                                         -----------  -------------  -----------  -------------       -------     -----------
 
NET INTEREST INCOME:...................      34,428         4,905        39,333        16,820          (1,408)        54,745
  Less: provision for loan and lease
    losses.............................       1,400           410         1,810        --              --              1,810
                                         -----------  -------------  -----------  -------------       -------     -----------
    NET INTEREST INCOME AFTER PROVISION
      FOR LOAN AND LEASE LOSSES........      33,028         4,495        37,523        16,820          (1,408)        52,935
 
NON-INTEREST INCOME:
  Service charges and fees.............       3,838           602         4,440         3,416          --              7,856
  Gain on sale of loans and other
    assets.............................          78        --                78        --              --                 78
  Securities gains.....................         342        --               342        --              --                342
  Other income.........................         770            27           797           118          --                915
                                         -----------  -------------  -----------  -------------       -------     -----------
    TOTAL NON-INTEREST INCOME..........       5,028           629         5,657         3,534          --              9,191
 
NON-INTEREST EXPENSE:
  Salaries and benefits................      12,715         2,269        14,984         7,064             (66)        21,982
  Occupancy, furniture and equipment...       3,889           810         4,699         2,068             137          6,904
  Advertising and business
    development........................         596            87           683           426          --              1,109
  Other real estate owned..............          69            12            81          (517)         --               (436)
  Professional services................       1,753           221         1,974           953          --              2,927
  Telephone, stationery and supplies...       1,420           166         1,586           327          --              1,913
  Goodwill amortization................       1,270           102         1,372        --               3,989          5,361
  Data processing......................         791        --               791            61          --                852
  Customer services cost...............         559        --               559            72          --                631
  Merger costs.........................       3,470        --             3,470        --              --              3,470
  Other................................       3,268           422         3,690         1,232          --              4,922
                                         -----------  -------------  -----------  -------------       -------     -----------
    TOTAL NON-INTEREST EXPENSE.........      29,800         4,089        33,889        11,686           4,060         49,635
                                         -----------  -------------  -----------  -------------       -------     -----------
Income before income taxes.............       8,256         1,035         9,291         8,668          (5,468)        12,491
Income taxes...........................       4,811        --             4,811         3,004            (614)         7,201
                                         -----------  -------------  -----------  -------------       -------     -----------
    NET INCOME.........................   $   3,445     $   1,035     $   4,480     $   5,664       $  (4,854)     $   5,290
                                         -----------  -------------  -----------  -------------       -------     -----------
                                         -----------  -------------  -----------  -------------       -------     -----------
 
PER SHARE INFORMATION(1):
  Number of shares (weighted average)
    Basic..............................    10,492.5       2,878.8      11,708.5       7,084.2                       16,682.0
    Diluted............................    10,778.3       3,277.1      12,162.5       7,084.2                       17,136.0
  Income per share
    Basic..............................   $    0.33     $    0.36     $    0.38     $    0.80                      $    0.32
    Diluted............................   $    0.32     $    0.32     $    0.37     $    0.80                      $    0.31
</TABLE>
    
 
     See "NOTES TO UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL DATA".
 
                                       44
<PAGE>
            UNAUDITED PRO FORMA COMBINED CONDENSED INCOME STATEMENT
                      FOR THE YEAR ENDED DECEMBER 31, 1997
 
   
<TABLE>
<CAPTION>
                                                                                                                   WESTERN AND
                                             WESTERN        BKLA       WESTERN AND  SANTA MONICA     PRO FORMA      BKLA PRO
                                           (HISTORICAL) (HISTORICAL)(1)    BKLA     (HISTORICAL)(3) ADJUSTMENTS(3)    FORMA
                                           -----------  -------------  -----------  -------------  --------------  -----------
                                                                  (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                        <C>          <C>            <C>          <C>            <C>             <C>
INTEREST INCOME:
  Interest and fees on loans and
    leases...............................   $  80,639     $  11,229     $  91,868     $  36,794      $   --         $ 128,662
  Interest on interest bearing deposits
    in other banks.......................      --                 1             1        --              --                 1
  Interest on investment securities......      15,714         2,731        18,445         8,922          --            27,367
  Interest on federal funds sold.........       4,681           893         5,574         3,652          (2,816)        6,410
                                           -----------  -------------  -----------  -------------  --------------  -----------
    TOTAL INTEREST INCOME................     101,034        14,854       115,888        49,368          (2,816)      162,440
 
INTEREST EXPENSE:
  Interest expense on deposits...........      28,276         3,673        31,949        14,575          --            46,524
  Interest expense on borrowings.........       1,082           258         1,340           196          --             1,536
                                           -----------  -------------  -----------  -------------  --------------  -----------
    TOTAL INTEREST EXPENSE...............      29,358         3,931        33,289        14,771          --            48,060
                                           -----------  -------------  -----------  -------------  --------------  -----------
NET INTEREST INCOME:.....................      71,676        10,923        82,599        34,597          (2,816)      114,380
  Less: provision for loan and lease
    losses...............................       2,800           410         3,210        --              --             3,210
                                           -----------  -------------  -----------  -------------  --------------  -----------
    NET INTEREST INCOME AFTER PROVISION
      FOR LOAN AND LEASE LOSSES..........      68,876        10,513        79,389        34,597          (2,816)      111,170
 
NON-INTEREST INCOME:
  Service charges, commissions and
    fees.................................       7,533         1,273         8,806         7,032          --            15,838
  Gain on sale of loans and other
    assets...............................          78        --                78        --              --                78
  Securities gains.......................         342        --               342            13          --               355
  Other income...........................       1,733           115         1,848           229          --             2,077
                                           -----------  -------------  -----------  -------------  --------------  -----------
    TOTAL NON-INTEREST INCOME............       9,686         1,388        11,074         7,274          --            18,348
 
NON-INTEREST EXPENSE:
  Salaries and benefits..................      25,023         4,802        29,825        14,661            (131)       44,355
  Occupancy, furniture and equipment.....       7,843         1,778         9,621         4,151             274        14,046
  Advertising and business development...       1,225           155         1,380           844          --             2,224
  Other real estate owned................         242            29           271          (547)         --              (276)
  Professional services..................       3,706           382         4,088         1,444          --             5,532
  Telephone, stationery and supplies.....       2,735           347         3,082           632          --             3,714
  Goodwill amortization..................       2,538           246         2,784        --               7,977        10,761
  Data processing........................       1,667        --             1,667           116          --             1,783
  Customer services cost.................       1,263        --             1,263           265          --             1,528
  Merger related costs...................      14,201        --            14,201         1,052          --            15,253
  Other..................................       5,314           803         6,117         2,441          --             8,558
                                           -----------  -------------  -----------  -------------  --------------  -----------
    TOTAL NON-INTEREST EXPENSE...........      65,757         8,542        74,299        25,059           8,120       107,478
                                           -----------  -------------  -----------  -------------  --------------  -----------
Income before income taxes...............      12,805         3,359        16,164        16,812         (10,936)       22,040
Income taxes (benefits)..................       9,643          (372)        9,271         5,905          (1,228)       13,948
                                           -----------  -------------  -----------  -------------  --------------  -----------
    NET INCOME...........................   $   3,162     $   3,731     $   6,893     $  10,907      $   (9,708)    $   8,092
                                           -----------  -------------  -----------  -------------  --------------  -----------
                                           -----------  -------------  -----------  -------------  --------------  -----------
PER SHARE INFORMATION(1):
  Number of shares (weighted average)
    Basic................................    10,523.9       3,226.0      11,886.6       7,084.2                      16,860.1
    Diluted..............................    10,731.6       3,749.7      12,315.5       7,084.2                      17,289.0
  Income per share
    Basic................................   $    0.30     $    1.16     $    0.58     $    1.54                     $    0.48
    Diluted..............................   $    0.29     $    1.00     $    0.56     $    1.54                     $    0.47
</TABLE>
    
 
     See "NOTES TO UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL DATA".
 
                                       45
<PAGE>
            UNAUDITED PRO FORMA COMBINED CONDENSED INCOME STATEMENT
                      FOR THE YEAR ENDED DECEMBER 31, 1996
 
   
<TABLE>
<CAPTION>
                                                                                                       WESTERN AND
                                                                             WESTERN        BKLA        BKLA PRO
                                                                           (HISTORICAL) (HISTORICAL)(1)    FORMA
                                                                           -----------  -------------  -----------
                                                                            (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                                        <C>          <C>            <C>
INTEREST INCOME:
  Interest and fees on loans and leases..................................   $  58,374     $   7,702     $  66,076
  Interest on interest bearing deposits in other banks...................           3            12            15
  Interest on investment securities......................................      12,862         2,008        14,870
  Interest on federal funds sold.........................................       2,998           839         3,837
                                                                           -----------  -------------  -----------
    TOTAL INTEREST INCOME................................................      74,237        10,561        84,798
 
INTEREST EXPENSE:
  Interest expense on deposits...........................................      21,382         2,830        24,212
  Interest expense on borrowings.........................................         929           257         1,186
                                                                           -----------  -------------  -----------
    TOTAL INTEREST EXPENSE...............................................      22,311         3,087        25,398
                                                                           -----------  -------------  -----------
NET INTEREST INCOME:.....................................................      51,926         7,474        59,400
  Less: provision for loan and lease losses..............................       1,018           750         1,768
                                                                           -----------  -------------  -----------
    NET INTEREST INCOME AFTER PROVISION FOR LOAN AND LEASE LOSSES........      50,908         6,724        57,632
 
NON-INTEREST INCOME:
  Service charges, commissions and fees..................................       7,485           966         8,451
  Gain on sale of loans and other assets.................................         665        --               665
  Securities gains (losses)..............................................         281            (5)          276
  Other income...........................................................       1,444            76         1,520
                                                                           -----------  -------------  -----------
    TOTAL NON-INTEREST INCOME............................................       9,875         1,037        10,912
 
NON-INTEREST EXPENSE:
  Salaries and benefits..................................................      23,016         3,408        26,424
  Occupancy, furniture and equipment.....................................       7,649         1,306         8,955
  Advertising and business development...................................       1,342           137         1,479
  Other real estate owned................................................        (134)           68           (66)
  Professional services..................................................       6,054           472         6,526
  Telephone, stationery and supplies.....................................       2,201           346         2,547
  Goodwill amortization..................................................       1,004           119         1,123
  Data processing........................................................       1,064        --             1,064
  Customer services cost.................................................         510        --               510
  Other..................................................................       5,432           904         6,336
                                                                           -----------  -------------  -----------
    TOTAL NON-INTEREST EXPENSE...........................................      48,138         6,760        54,898
                                                                           -----------  -------------  -----------
Income before income taxes...............................................      12,645         1,001        13,646
Income taxes.............................................................       3,656        --             3,656
                                                                           -----------  -------------  -----------
    NET INCOME...........................................................   $   8,989     $   1,001     $   9,990
                                                                           -----------  -------------  -----------
                                                                           -----------  -------------  -----------
PER SHARE INFORMATION(1):
  Number of shares (weighted average)
    Basic................................................................     8,095.7       2,195.1       9,022.9
    Diluted..............................................................     8,248.4       2,475.9       9,294.2
  Income per share
    Basic................................................................   $    1.11     $    0.46     $    1.11
    Diluted..............................................................   $    1.09     $    0.40     $    1.07
</TABLE>
    
 
     See "NOTES TO UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL DATA".
 
                                       46
<PAGE>
            UNAUDITED PRO FORMA COMBINED CONDENSED INCOME STATEMENT
                      FOR THE YEAR ENDED DECEMBER 31, 1995
 
   
<TABLE>
<CAPTION>
                                                                                                       WESTERN AND
                                                                             WESTERN        BKLA        BKLA PRO
                                                                           (HISTORICAL) (HISTORICAL)(1)    FORMA
                                                                           -----------  -------------  -----------
                                                                            (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                                        <C>          <C>            <C>
INTEREST INCOME:
  Interest and fees on loans and leases..................................   $  49,014     $   4,808     $  53,822
  Interest on interest bearing deposits in other banks...................          43             2            45
  Interest on investment securities......................................      10,726         1,575        12,301
  Interest on federal funds sold.........................................       2,846           434         3,280
                                                                           -----------  -------------  -----------
    TOTAL INTEREST INCOME................................................      62,629         6,819        69,448
 
INTEREST EXPENSE:
  Interest expense on deposits...........................................      19,167         1,542        20,709
  Interest expense on borrowings.........................................         637           310           947
                                                                           -----------  -------------  -----------
    TOTAL INTEREST EXPENSE...............................................      19,804         1,852        21,656
                                                                           -----------  -------------  -----------
NET INTEREST INCOME:.....................................................      42,825         4,967        47,792
  Less: provision for (recovery of) loan and lease losses................       8,564          (311)        8,253
                                                                           -----------  -------------  -----------
    NET INTEREST INCOME AFTER PROVISION FOR LOAN AND LEASE LOSSES........      34,261         5,278        39,539
 
NON-INTEREST INCOME:
  Service charges, commissions and fees..................................       6,551           757         7,308
  Gain on sale of loans and other assets.................................         145           118           263
  Securities (losses)....................................................        (692)          (46)         (738)
  Other income...........................................................       1,822            49         1,871
                                                                           -----------  -------------  -----------
    TOTAL NON-INTEREST INCOME............................................       7,826           878         8,704
 
NON-INTEREST EXPENSE:
  Salaries and benefits..................................................      19,575         2,798        22,373
  Occupancy, furniture and equipment.....................................       7,878           941         8,819
  Advertising and business development...................................       1,199           128         1,327
  Other real estate owned................................................       3,080            24         3,104
  Professional services..................................................       3,176           547         3,723
  Telephone, stationery and supplies.....................................       2,337           254         2,591
  Goodwill amortization..................................................         821            20           841
  Lower of cost or market adjustment on loans available for sale.........         756        --               756
  Data processing........................................................         822        --               822
  Customer services cost.................................................         184        --               184
  Other..................................................................       5,781           798         6,579
                                                                           -----------  -------------  -----------
    TOTAL NON-INTEREST EXPENSE...........................................      45,609         5,510        51,119
                                                                           -----------  -------------  -----------
Income (loss) before income taxes........................................      (3,522)          646        (2,876)
Income taxes (benefit)...................................................      (1,733)       --            (1,733)
                                                                           -----------  -------------  -----------
    NET INCOME (LOSS)....................................................   $  (1,789)    $     646     $  (1,143)
                                                                           -----------  -------------  -----------
                                                                           -----------  -------------  -----------
PER SHARE INFORMATION(1):
  Number of shares (weighted average)
    Basic................................................................     6,486.9       1,017.5       6,916.7
    Diluted..............................................................     6,598.5       1,268.8       7,134.4
  Income (loss) per share
    Basic................................................................   $   (0.28)    $    0.63     $   (0.17)
    Diluted..............................................................   $   (0.28)    $    0.51     $   (0.17)
</TABLE>
    
 
     See "NOTES TO UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL DATA".
 
                                       47
<PAGE>
         NOTES TO UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL DATA
 
   
NOTE 1: BASIS OF PRESENTATION
    
 
   
    Certain historical data of BKLA have been reclassified on a pro forma basis
to conform to Western's classifications. Transactions between Western and BKLA
are not material in relation to the unaudited pro forma combined financial
statements, and have not been eliminated from the pro forma combined amounts.
The unaudited pro forma number of common shares outstanding, common
shareholders' equity per share, number of shares (basic and diluted) and income
(loss) per share (basic and diluted) are based on the share amounts for Western
plus the historical share amounts for BKLA multiplied by the Conversion Number
of 0.4224. In addition, at the Effective Time, all outstanding options to
purchase shares of BKLA Common Stock under BKLA's stock option plan (each, a
"BKLA Stock Option"), unless otherwise exercised pursuant to Section 10 of
BKLA's stock option plan, shall be converted into the right to receive for each
share of BKLA Common Stock otherwise issuable upon exercise thereof a number of
shares of Western Common Stock equal to the quotient obtained by dividing the
Spread by $42.61 ("Replacement Shares"). As used herein, "Spread" means the
difference, if positive, obtained by subtracting the exercise price of such BKLA
Stock Option from $18.00. After accumulating all such Replacement Shares
issuable to any holder of BKLA Stock Options, any fractional Replacement Shares
issuable to any holder of BKLA Stock Options of 0.2 or above shall be rounded
upwards. Further, at the Effective Time, each outstanding warrant to purchase
shares of BKLA Common Stock under BKLA's warrant agreement (each, a "BKLA
Warrant"), shall be converted into a warrant to acquire, on the same terms and
conditions as were applicable under such BKLA warrant agreement, the number of
shares of Western Common Stock equal to (a) the number of shares of BKLA Common
Stock subject to the BKLA Warrant, multiplied by (b) the Conversion Number (such
product rounded down to the nearest whole number) (a "Replacement Warrant"), at
an exercise price per share (rounded up to the nearest whole cent) equal to (y)
the aggregate exercise price for the shares of BKLA Common Stock which were
purchasable pursuant to such BKLA Warrant divided by (z) the number of full
shares of Western Common Stock subject to such Replacement Warrant in accordance
with the foregoing.
    
 
   
NOTE 2: MERGER COSTS
    
 
    The unaudited pro forma combined condensed financial data reflects Western
Management's current estimate, for purposes of pro forma presentation, of the
aggregate estimated merger costs of $7,080,000 ($5,400,000 net of taxes,
computed using the combined federal and state tax rate of 41.5%) expected to be
incurred in connection with the Merger. While a portion of these costs may be
required to be recognized over time, the current estimate of these costs has
been recorded in the pro forma combined balance sheets in order to disclose the
aggregate effect of these activities on Western's pro forma combined financial
position. The estimated aggregate costs include the following:
 
<TABLE>
<CAPTION>
                                                                                    (DOLLARS IN
                                                                                    THOUSANDS)
                                                                                    -----------
<S>                                                                                 <C>
Employee costs....................................................................   $   1,500
Conversion costs..................................................................         500
Other costs.......................................................................       2,050
                                                                                    -----------
                                                                                         4,050
Tax effects.......................................................................      (1,680)
                                                                                    -----------
                                                                                         2,370
Investment banking and other professional fees....................................       3,030
                                                                                    -----------
    TOTAL ESTIMATED AGGREGATE COSTS...............................................   $   5,400
                                                                                    -----------
                                                                                    -----------
</TABLE>
 
                                       48
<PAGE>
    Western Management's cost estimates are forward-looking. While the costs
represent Western Management's current estimate of merger costs that will be
incurred, the ultimate level and timing of recognition of such costs will be
based on the final merger and integration plan to be completed prior to
consummation of the Merger, which will be developed by various of Western's and
BKLA's task forces and integration committees. Readers are cautioned that the
completion of the merger and integration plan and the resulting management plans
detailing actions to be undertaken to effect the Merger and resultant
integration of operations will impact these estimates; the type and amount of
actual costs incurred could vary materially from these estimates if future
developments differ from the underlying assumptions used by management in
determining the current estimate of these costs.
 
   
NOTE 3: PRO FORMA ADJUSTMENTS RELATED TO THE SMB ACQUISITION
    
 
   
    The SMB Acquisition was accounted for as a purchase effective on January 27,
1998. Accordingly, Western's balance sheet as of June 30, 1998, reflects such
acquisition. Under this method of accounting, assets and liabilities of Santa
Monica Bank were adjusted to their estimated fair values and combined with the
recorded book values of the assets and liabilities of Western. Applicable income
tax effects of such adjustments are included as a component of Western's net
deferred tax asset with a corresponding offset to goodwill.
    
 
   
    The unaudited pro forma combined condensed statements of income for the six
month periods ending June 30, 1998, June 30, 1997 and for the year ended
December 31, 1997 are presented as if the acquisition was consummated at the
beginning of each period. The pro forma combined statements of income for these
periods combine the individual pro forma results of operations of Western, BKLA
and Santa Monica Bank for each period after giving effect to the amortization of
purchase accounting adjustments, the additional equity which was raised by
Western and the reduced interest income resulting from the cash payments made as
part of the SMB Acquisition. The pro forma purchase accounting adjustments for
each period represent the amortization that would have taken place from the
beginning of the period.
    
 
   
    For the purposes of the unaudited pro forma combined condensed statement of
income, it is estimated that Western would have earned 5.50% on the $51.2
million cash portion of the SMB Acquisition purchase price during each period,
resulting in approximately $235,000 less interest income for the six month
period ended June 30, 1998, $1,408,000 less interest income for the six month
period ended June 30, 1997 and $2.8 million less interest income for 1997.
    
 
   
    Salaries and benefits expense is estimated to be reduced by approximately
$11,000, $66,000 and $131,000 for the six month period ended June 30, 1998, the
six month period ended June 30, 1997 and for the year ended December 31, 1997,
respectively, as a result of the write-off of the unrecognized transition
obligation related to post-retirement health care benefits.
    
 
   
    For the year ended December 31, 1997, occupancy, furniture and equipment
expense increased by an estimated $194,000 of depreciation expense related to
the fair market value adjustment of Santa Monica Bank's property, plant and
equipment and by approximately $80,000 related to the amortization of favorable
lease assets, resulting in an approximately $274,000 additional expense. For the
six month periods ended June 30, 1998 and June 30, 1997, this additional expense
is $23,000 and $137,000, respectively.
    
 
    Goodwill of approximately $119.7 million is amortized on a straight line
basis over 15 years.
 
    Income taxes are estimated to be at a rate of 41.5% of pretax income before
goodwill amortization.
 
                                       49
<PAGE>
   
                            WESTERN--BKLA--PENINSULA
    
 
   
             UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL DATA
    
 
   
The following unaudited pro forma combined condensed financial data combines (i)
the pro forma consolidated condensed financial statements of Western and BKLA
giving effect to the Merger and (ii) the historical financial statements of
Peninsula, giving effect to the Peninsula Merger as if it had been effective on
June 30, 1998 and December 31, 1997, with respect to the Western-BKLA-Peninsula
Pro Forma Combined Condensed Balance Sheets, and as of the beginning of the
periods indicated, with respect to the Western-BKLA-Peninsula Pro Forma Combined
Condensed Statements of Income. This information is presented under
pooling-of-interests accounting. The unaudited pro forma combined condensed
financial data also combines the historical condensed statements of income of
Santa Monica Bank, acquired by Western on January 27, 1998, in a merger
accounted for under the purchase method of accounting, for the year ended
December 31, 1997 and the six months ended June 30, 1998 and 1997, as if the SMB
Acquisition occurred at the beginning of such periods. The information for the
six months ended June 30, 1998 and 1997 is derived from the unaudited financial
statements of Western, BKLA, Santa Monica Bank and Peninsula, which includes, in
the opinion of the managements of Western, BKLA, Santa Monica Bank and
Peninsula, respectively, all adjustments (consisting only of normal accruals)
necessary to present fairly the data for such periods. This information should
be read in conjunction with the historical consolidated financial statements of
Western, BKLA and Santa Monica Bank, including their respective notes thereto,
which are included or incorporated by reference into this Proxy
Statement-Prospectus, and in conjunction with the combined condensed historical
selected financial data and other pro forma combined financial information of
Western, BKLA, Santa Monica Bank and Peninsula including the notes thereto,
appearing elsewhere in this Proxy Statement-Prospectus. See "INCORPORATION OF
CERTAIN INFORMATION BY REFERENCE". The effect of estimated merger and
reorganization costs expected to be incurred in connection with the Peninsula
Merger has been reflected in the Western-BKLA-Peninsula Unaudited Pro Forma
Combined Condensed Balance Sheets; however, since the estimated costs are
nonrecurring, they have not been reflected in the Western-BKLA-Peninsula
Unaudited Pro Forma Combined Condensed Statements of Income. See Note 2 to the
WESTERN-BKLA-PENINSULA UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL DATA.
The unaudited pro forma combined condensed data does not give effect to any
anticipated operating efficiencies in conjunction with the Peninsula Merger. The
Western-BKLA-Peninsula Unaudited Pro Forma Combined Condensed Balance Sheets are
not necessarily indicative of the actual financial position that would have
existed had the Merger or the Peninsula Merger been consummated on June 30, 1998
or December 31, 1997, or that may exist in the future. The Western-
BKLA-Peninsula Unaudited Pro Forma Combined Condensed Statements of Income are
not necessarily indicative of the results that would have occurred had the
Merger and the Peninsula Merger been consummated on the dates indicated or that
may be achieved in the future. Assuming the consummation of the Merger and the
Peninsula Merger, the actual financial position and results of operations will
differ, perhaps significantly, from the pro forma amounts reflected herein
because of a variety of factors, including changes in value and changes in
operating results between the dates of the unaudited pro forma financial data
and the dates on which the Merger and the Peninsula Merger take place.
    
 
                                       50
<PAGE>
   
                            WESTERN--BKLA--PENINSULA
    
 
   
            UNAUDITED PRO FORMA COMBINED CONDENSED BALANCE SHEET AT
                                 JUNE 30, 1998
    
 
   
<TABLE>
<CAPTION>
                                                        WESTERN                      PENINSULA     WESTERN, BKLA
                                                        AND BKLA      PENINSULA      PRO FORMA     AND PENINSULA
                                                       PRO FORMA    (HISTORICAL)(1) ADJUSTMENTS(2)   PRO FORMA
                                                      ------------  -------------  --------------  --------------
<S>                                                   <C>           <C>            <C>             <C>
                                                                 (IN THOUSANDS, EXCEPT PER SHARE DATA)
ASSETS:
Cash and due from banks.............................  $    176,622   $    33,093     $   --         $    209,715
Federal funds sold..................................       191,329        19,500         --              210,829
                                                      ------------  -------------       -------    --------------
  TOTAL CASH AND CASH EQUIVALENTS...................       367,951        52,593         --              420,544
 
Federal Reserve Bank and Federal Home Loan Bank
  stock, at cost....................................         7,250         1,254         --                8,504
Securities held to maturity.........................        87,188        82,341         --              169,529
Securities available for sale.......................       218,376        28,023         --              246,399
                                                      ------------  -------------       -------    --------------
  TOTAL SECURITIES..................................       312,814       111,618         --              424,432
 
Net loans...........................................     1,400,892       240,785         --            1,641,677
Property, plant and equipment.......................        34,553        11,939         --               46,492
Other real estate owned.............................         6,491       --              --                6,491
Goodwill............................................       151,029       --              --              151,029
Other assets........................................        34,467        11,337          2,400           48,204
                                                      ------------  -------------       -------    --------------
  TOTAL ASSETS......................................  $  2,308,197   $   428,272     $    2,400     $  2,738,869
                                                      ------------  -------------       -------    --------------
                                                      ------------  -------------       -------    --------------
 
LIABILITIES AND SHAREHOLDERS' EQUITY
 
LIABILITIES:
Non-interest bearing deposits.......................  $    724,713   $   143,342     $   --         $    868,055
Interest bearing deposits...........................     1,215,191       253,713         --            1,468,904
                                                      ------------  -------------       -------    --------------
  TOTAL DEPOSITS....................................     1,939,904       397,055         --            2,336,959
Borrowed funds......................................        28,629           600         --               29,229
Accrued interest payable and other liabilities......        22,367         3,359          8,515           34,241
                                                      ------------  -------------       -------    --------------
  TOTAL LIABILITIES.................................     1,990,900       401,014          8,515        2,400,429
 
SHAREHOLDERS' EQUITY:
Preferred stock.....................................       --            --              --              --
Common stock and additional paid in capital.........       294,299        19,017         --              313,316
Retained earnings...................................        22,928         8,269         (6,115)          25,082
Other comprehensive income (loss)...................            70           (28)        --                   42
                                                      ------------  -------------       -------    --------------
  TOTAL SHAREHOLDERS' EQUITY........................       317,297        27,258         (6,115)         338,440
                                                      ------------  -------------       -------    --------------
  TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY........  $  2,308,197   $   428,272     $    2,400     $  2,738,869
                                                      ------------  -------------       -------    --------------
                                                      ------------  -------------       -------    --------------
Number of common shares outstanding(1)..............      17,843.4       2,487.1                        20,482.0
Common shareholders' equity per share(1)............  $      17.78   $     10.96                    $      16.52
Tangible common shareholders' equity per share(1)...  $       9.32   $     10.96                    $       9.15
</TABLE>
    
 
   
  See "NOTES TO WESTERN-BKLA-PENINSULA UNAUDITED PRO FORMA COMBINED CONDENSED
                                FINANCIAL DATA".
    
 
                                       51
<PAGE>
   
                            WESTERN--BKLA--PENINSULA
    
 
   
            UNAUDITED PRO FORMA COMBINED CONDENSED BALANCE SHEET AT
                               DECEMBER 31, 1997
    
 
   
<TABLE>
<CAPTION>
                                                        WESTERN                    PENINSULA PRO   WESTERN, BKLA
                                                        AND BKLA      PENINSULA        FORMA       AND PENINSULA
                                                       PRO FORMA    (HISTORICAL)(1) ADJUSTMENTS(2)   PRO FORMA
                                                      ------------  -------------  --------------  --------------
<S>                                                   <C>           <C>            <C>             <C>
                                                                 (IN THOUSANDS, EXCEPT PER SHARE DATA)
ASSETS:
Cash and due from banks.............................  $    120,102   $    33,615     $   --         $    153,717
Federal funds sold..................................       168,257         6,000         --              174,257
                                                      ------------  -------------       -------    --------------
  TOTAL CASH AND CASH EQUIVALENTS...................       288,359        39,615         --              327,974
 
Federal Reserve Bank and Federal Home Loan Bank
  stock, at cost....................................         6,411         1,032         --                7,443
Securities held to maturity.........................        48,138        86,050         --              134,188
Securities available for sale.......................       213,398        37,959         --              251,357
                                                      ------------  -------------       -------    --------------
  TOTAL SECURITIES..................................       267,947       125,041         --              392,988
 
Net loans...........................................     1,004,654       232,198         --            1,236,852
Property, plant and equipment.......................        16,335        12,059         --               28,394
Other real estate owned.............................         7,736           259         --                7,995
Goodwill............................................        36,369       --              --               36,369
Other assets........................................        35,823         9,073          2,400           47,296
                                                      ------------  -------------       -------    --------------
  TOTAL ASSETS......................................  $  1,657,223   $   418,245     $    2,400     $  2,077,868
                                                      ------------  -------------       -------    --------------
                                                      ------------  -------------       -------    --------------
 
LIABILITIES AND SHAREHOLDERS' EQUITY
 
LIABILITIES:
Non-interest bearing deposits.......................  $    542,725   $   121,657     $   --         $    664,382
Interest bearing deposits...........................       922,080       267,575         --            1,189,655
                                                      ------------  -------------       -------    --------------
  TOTAL DEPOSITS....................................     1,464,805       389,232         --            1,854,037
Borrowed funds......................................        14,600           600         --               15,200
Accrued interest payable and other liabilities......        22,509         3,057          8,515           34,081
                                                      ------------  -------------       -------    --------------
  TOTAL LIABILITIES.................................     1,501,914       392,889          8,515        1,903,318
 
SHAREHOLDERS' EQUITY:
Preferred stock.....................................       --            --              --              --
Common stock........................................       143,577        19,017         --              162,594
Retained earnings...................................        11,874         6,407         (6,115)          12,166
Other comprehensive income (loss)...................          (142)          (68)        --                 (210)
                                                      ------------  -------------       -------    --------------
  TOTAL SHAREHOLDERS' EQUITY........................       155,309        25,356         (6,115)         174,550
                                                      ------------  -------------       -------    --------------
  TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY........  $  1,657,223   $   418,245     $    2,400     $  2,077,868
                                                      ------------  -------------       -------    --------------
                                                      ------------  -------------       -------    --------------
Number of common shares outstanding(1)..............      12,744.4       2,487.1                        15,383.0
Common shareholders' equity per share(1)............  $      12.19   $     10.20                    $      11.35
Tangible common shareholders' equity per share(1)...  $       9.33   $     10.20                    $       8.98
</TABLE>
    
 
   
  See "NOTES TO WESTERN-BKLA-PENINSULA UNAUDITED PRO FORMA COMBINED CONDENSED
                                FINANCIAL DATA".
    
 
                                       52
<PAGE>
   
                            WESTERN--BKLA--PENINSULA
    
 
   
            UNAUDITED PRO FORMA COMBINED CONDENSED INCOME STATEMENT
                     FOR THE SIX MONTHS ENDED JUNE 30, 1998
    
 
   
<TABLE>
<CAPTION>
                                                                                                       WESTERN,
                                                                          WESTERN AND                  BKLA AND
                                                                             BKLA        PENINSULA     PENINSULA
                                                                           PRO FORMA   (HISTORICAL)(1)  PRO FORMA
                                                                          -----------  -------------  -----------
<S>                                                                       <C>          <C>            <C>
                                                                           (IN THOUSANDS, EXCEPT PER SHARE DATA)
INTEREST INCOME:
  Interest and fees on loans and leases.................................   $  67,523     $  10,775     $  78,298
  Interest on interest bearing deposits in other banks..................          38           147           185
  Interest on investment securities.....................................       9,653         3,325        12,978
  Interest on federal funds sold........................................       6,144           378         6,522
                                                                          -----------  -------------  -----------
    TOTAL INTEREST INCOME...............................................      83,358        14,625        97,983
 
INTEREST EXPENSE:
  Interest expense on deposits..........................................      21,660         4,388        26,048
  Interest expense on borrowings........................................         862            41           903
                                                                          -----------  -------------  -----------
    TOTAL INTEREST EXPENSE..............................................      22,522         4,429        26,951
                                                                          -----------  -------------  -----------
NET INTEREST INCOME:....................................................      60,836        10,196        71,032
  Less: provision for loan and lease losses.............................         380           139           519
                                                                          -----------  -------------  -----------
    NET INTEREST INCOME AFTER PROVISION FOR LOAN AND LEASE LOSSES.......      60,456        10,057        70,513
 
NON-INTEREST INCOME:
  Service charges, commissions and fees.................................       8,800         2,009        10,809
  Securities gains......................................................         204            30           234
  Other income..........................................................         498           428           926
                                                                          -----------  -------------  -----------
    TOTAL NON-INTEREST INCOME...........................................       9,502         2,467        11,969
 
NON-INTEREST EXPENSE:
  Salaries and benefits.................................................      21,607         5,106        26,713
  Occupancy, furniture and equipment....................................       6,731         1,301         8,032
  Advertising and business development..................................         722           316         1,038
  Other real estate owned...............................................        (184)           32          (152)
  Professional services.................................................       2,092           133         2,225
  Telephone, stationery and supplies....................................       1,748           369         2,117
  Goodwill amortization.................................................       5,463        --             5,463
  Data processing.......................................................       1,135           358         1,493
  Customer services cost................................................         850           648         1,498
  Merger costs..........................................................         429        --               429
  Other.................................................................       3,221           695         3,916
                                                                          -----------  -------------  -----------
    TOTAL NON-INTEREST EXPENSE..........................................      43,814         8,958        52,772
                                                                          -----------  -------------  -----------
Income before income taxes..............................................      26,144         3,566        29,710
Income taxes............................................................      12,719         1,337        14,056
                                                                          -----------  -------------  -----------
    NET INCOME..........................................................   $  13,425     $   2,229     $  15,654
                                                                          -----------  -------------  -----------
                                                                          -----------  -------------  -----------
PER SHARE INFORMATION(1):
  Number of shares (weighted average)
    Basic...............................................................    17,668.1       2,487.1      20,306.7
    Diluted.............................................................    18,136.8       2,487.1      20,775.4
  Income per share
    Basic...............................................................   $    0.76     $    0.90     $    0.77
    Diluted.............................................................   $    0.74     $    0.90     $    0.75
</TABLE>
    
 
   
 See "NOTES TO WESTERN--BKLA--PENINSULA UNAUDITED PRO FORMA COMBINED CONDENSED
                                FINANCIAL DATA".
    
 
                                       53
<PAGE>
   
                            WESTERN--BKLA--PENINSULA
    
 
   
            UNAUDITED PRO FORMA COMBINED CONDENSED INCOME STATEMENT
                     FOR THE SIX MONTHS ENDED JUNE 30, 1997
    
 
   
<TABLE>
<CAPTION>
                                                                                                       WESTERN,
                                                                          WESTERN AND                  BKLA AND
                                                                             BKLA        PENINSULA     PENINSULA
                                                                           PRO FORMA   (HISTORICAL)(1)  PRO FORMA
                                                                          -----------  -------------  -----------
<S>                                                                       <C>          <C>            <C>
                                                                           (IN THOUSANDS, EXCEPT PER SHARE DATA)
INTEREST INCOME:
  Interest and fees on loans and leases.................................   $  61,732     $   9,886     $  71,618
  Interest on interest bearing deposits in other banks..................           1            42            43
  Interest on investment securities.....................................      13,669         2,606        16,275
  Interest on federal funds sold........................................       2,415           165         2,580
                                                                          -----------  -------------  -----------
    TOTAL INTEREST INCOME...............................................      77,817        12,699        90,516
 
INTEREST EXPENSE:
  Interest expense on deposits..........................................      22,251         3,963        26,214
  Interest expense on borrowings........................................         821            29           850
                                                                          -----------  -------------  -----------
    TOTAL INTEREST EXPENSE..............................................      23,072         3,992        27,064
                                                                          -----------  -------------  -----------
NET INTEREST INCOME:....................................................      54,745         8,707        63,452
  Less: provision for loan and lease losses.............................       1,810           325         2,135
                                                                          -----------  -------------  -----------
    NET INTEREST INCOME AFTER PROVISION FOR LOAN AND LEASE LOSSES.......      52,935         8,382        61,317
 
NON-INTEREST INCOME:
  Service charges and fees..............................................       7,856         1,620         9,476
  Gain on sale of loans and other assets................................          78        --                78
  Securities gains......................................................         342             5           347
  Other income..........................................................         915           434         1,349
                                                                          -----------  -------------  -----------
    TOTAL NON-INTEREST INCOME...........................................       9,191         2,059        11,250
 
NON-INTEREST EXPENSE:
  Salaries and benefits.................................................      21,982         4,310        26,292
  Occupancy, furniture and equipment....................................       6,904         1,128         8,032
  Advertising and business development..................................       1,109           296         1,405
  Other real estate owned...............................................        (436)           61          (375)
  Professional services.................................................       2,927           148         3,075
  Telephone, stationery and supplies....................................       1,913           334         2,247
  Goodwill amortization.................................................       5,361        --             5,361
  Data processing.......................................................         852           343         1,195
  Customer services cost................................................         631           427         1,058
  Merger costs..........................................................       3,470        --             3,470
  Other.................................................................       4,922           677         5,599
                                                                          -----------  -------------  -----------
    TOTAL NON-INTEREST EXPENSE..........................................      49,635         7,724        57,359
                                                                          -----------  -------------  -----------
Income before income taxes..............................................      12,491         2,717        15,208
Income taxes............................................................       7,201         1,044         8,245
                                                                          -----------  -------------  -----------
    NET INCOME..........................................................   $   5,290     $   1,673     $   6,963
                                                                          -----------  -------------  -----------
                                                                          -----------  -------------  -----------
PER SHARE INFORMATION(1):
  Number of shares (weighted average)
    Basic...............................................................    16,682.0       2,487.1      19,320.6
    Diluted.............................................................    17,136.0       2,487.1      19,774.6
  Income per share
    Basic...............................................................   $    0.32     $    0.67     $    0.36
    Diluted.............................................................   $    0.31     $    0.67     $    0.35
</TABLE>
    
 
   
 See "NOTES TO WESTERN--BKLA--PENINSULA UNAUDITED PRO FORMA COMBINED CONDENSED
                                FINANCIAL DATA".
    
 
                                       54
<PAGE>
   
                            WESTERN--BKLA--PENINSULA
    
 
   
            UNAUDITED PRO FORMA COMBINED CONDENSED INCOME STATEMENT
                      FOR THE YEAR ENDED DECEMBER 31, 1997
    
 
   
<TABLE>
<CAPTION>
                                                                                                       WESTERN,
                                                                          WESTERN AND                  BKLA AND
                                                                             BKLA        PENINSULA     PENINSULA
                                                                           PRO FORMA   (HISTORICAL)(1)  PRO FORMA
                                                                          -----------  -------------  -----------
<S>                                                                       <C>          <C>            <C>
                                                                           (IN THOUSANDS, EXCEPT PER SHARE DATA)
INTEREST INCOME:
  Interest and fees on loans and leases.................................   $ 128,662     $  20,450     $ 149,112
  Interest on interest bearing deposits in other banks..................           1           153           154
  Interest on investment securities.....................................      27,367         5,949        33,316
  Interest on federal funds sold........................................       6,410           481         6,891
                                                                          -----------  -------------  -----------
    TOTAL INTEREST INCOME...............................................     162,440        27,033       189,473
 
INTEREST EXPENSE:
  Interest expense on deposits..........................................      46,524         8,527        55,051
  Interest expense on borrowings........................................       1,536            73         1,609
                                                                          -----------  -------------  -----------
    TOTAL INTEREST EXPENSE..............................................      48,060         8,600        56,660
                                                                          -----------  -------------  -----------
NET INTEREST INCOME:....................................................     114,380        18,433       132,813
  Less: provision for loan and lease losses.............................       3,210           498         3,708
                                                                          -----------  -------------  -----------
    NET INTEREST INCOME AFTER PROVISION FOR LOAN AND LEASE LOSSES.......     111,170        17,935       129,105
 
NON-INTEREST INCOME:
  Service charges, commissions and fees.................................      15,838         3,296        19,134
  Gain on sale of loans and other assets................................          78        --                78
  Securities gains......................................................         355            60           415
  Other income..........................................................       2,077           798         2,875
                                                                          -----------  -------------  -----------
    TOTAL NON-INTEREST INCOME...........................................      18,348         4,154        22,502
 
NON-INTEREST EXPENSE:
  Salaries and benefits.................................................      44,355         9,253        53,608
  Occupancy, furniture and equipment....................................      14,046         2,557        16,603
  Advertising and business development..................................       2,224           690         2,914
  Other real estate owned...............................................        (276)          114          (162)
  Professional services.................................................       5,532           238         5,770
  Telephone, stationery and supplies....................................       3,714           685         4,399
  Goodwill amortization.................................................      10,761        --            10,761
  Data processing.......................................................       1,783           705         2,488
  Customer services cost................................................       1,528           955         2,483
  Merger related costs..................................................      15,253        --            15,253
  Other.................................................................       8,558         1,583        10,141
                                                                          -----------  -------------  -----------
    TOTAL NON-INTEREST EXPENSE..........................................     107,478        16,780       124,258
                                                                          -----------  -------------  -----------
Income before income taxes..............................................      22,040         5,309        27,349
Income taxes............................................................      13,948         1,708        15,656
                                                                          -----------  -------------  -----------
    NET INCOME..........................................................   $   8,092     $   3,601     $  11,693
                                                                          -----------  -------------  -----------
                                                                          -----------  -------------  -----------
PER SHARE INFORMATION(1):
  Number of shares (weighted average)
    Basic...............................................................    16,860.1       2,487.1      19,498.7
    Diluted.............................................................    17,289.0       2,487.1      19,927.6
  Income per share
    Basic...............................................................   $    0.48     $    1.45     $    0.60
    Diluted.............................................................   $    0.47     $    1.45     $    0.59
</TABLE>
    
 
   
 See "NOTES TO WESTERN--BKLA--PENINSULA UNAUDITED PRO FORMA COMBINED CONDENSED
                                FINANCIAL DATA".
    
 
                                       55
<PAGE>
   
                            WESTERN--BKLA--PENINSULA
    
 
   
            UNAUDITED PRO FORMA COMBINED CONDENSED INCOME STATEMENT
                      FOR THE YEAR ENDED DECEMBER 31, 1996
    
 
   
<TABLE>
<CAPTION>
                                                                                                       WESTERN,
                                                                          WESTERN AND                  BKLA AND
                                                                             BKLA        PENINSULA     PENINSULA
                                                                           PRO FORMA   (HISTORICAL)(1)  PRO FORMA
                                                                          -----------  -------------  -----------
<S>                                                                       <C>          <C>            <C>
                                                                           (IN THOUSANDS, EXCEPT PER SHARE DATA)
INTEREST INCOME:
  Interest and fees on loans and leases.................................   $  66,076     $  19,080     $  85,156
  Interest on interest bearing deposits in other banks..................          15            62            77
  Interest on investment securities.....................................      14,870         4,567        19,437
  Interest on federal funds sold........................................       3,837           336         4,173
                                                                          -----------  -------------  -----------
    TOTAL INTEREST INCOME...............................................      84,798        24,045       108,843
 
INTEREST EXPENSE:
  Interest expense on deposits..........................................      24,212         7,689        31,901
  Interest expense on borrowings........................................       1,186            77         1,263
                                                                          -----------  -------------  -----------
    TOTAL INTEREST EXPENSE..............................................      25,398         7,766        33,164
                                                                          -----------  -------------  -----------
NET INTEREST INCOME:....................................................      59,400        16,279        75,679
  Less: provision for loan and lease losses.............................       1,768           566         2,334
                                                                          -----------  -------------  -----------
    NET INTEREST INCOME AFTER PROVISION FOR LOAN AND LEASE LOSSES.......      57,632        15,713        73,345
 
NON-INTEREST INCOME:
  Service charges, commissions and fees.................................       8,451         3,149        11,600
  Gain on sale of loans and other assets................................         665        --               665
  Securities gains......................................................         276        --               276
  Other income..........................................................       1,520           542         2,062
                                                                          -----------  -------------  -----------
    TOTAL NON-INTEREST INCOME...........................................      10,912         3,691        14,603
 
NON-INTEREST EXPENSE:
  Salaries and benefits.................................................      26,424         8,247        34,671
  Occupancy, furniture and equipment....................................       8,955         2,223        11,178
  Advertising and business development..................................       1,479           559         2,038
  Other real estate owned...............................................         (66)          144            78
  Professional services.................................................       6,526           210         6,736
  Telephone, stationery and supplies....................................       2,547           629         3,176
  Goodwill amortization.................................................       1,123        --             1,123
  Data processing.......................................................       1,064           605         1,669
  Customer services cost................................................         510           894         1,404
  Other.................................................................       6,336           962         7,298
                                                                          -----------  -------------  -----------
    TOTAL NON-INTEREST EXPENSE..........................................      54,898        14,473        69,371
                                                                          -----------  -------------  -----------
Income before income taxes..............................................      13,646         4,931        18,577
Income taxes............................................................       3,656         1,877         5,533
                                                                          -----------  -------------  -----------
    NET INCOME..........................................................   $   9,990     $   3,054     $  13,044
                                                                          -----------  -------------  -----------
                                                                          -----------  -------------  -----------
PER SHARE INFORMATION(1):
  Number of shares (weighted average)
    Basic...............................................................     9,022.9       2,487.1      11,661.5
    Diluted.............................................................     9,294.2       2,487.1      11,932.8
  Income per share
    Basic...............................................................   $    1.11     $    1.23     $    1.12
    Diluted.............................................................   $    1.07     $    1.23     $    1.09
</TABLE>
    
 
   
 See "NOTES TO WESTERN--BKLA--PENINSULA UNAUDITED PRO FORMA COMBINED CONDENSED
                                FINANCIAL DATA".
    
 
                                       56
<PAGE>
   
                            WESTERN--BKLA--PENINSULA
    
 
   
            UNAUDITED PRO FORMA COMBINED CONDENSED INCOME STATEMENT
                      FOR THE YEAR ENDED DECEMBER 31, 1995
    
 
   
<TABLE>
<CAPTION>
                                                                                                       WESTERN,
                                                                          WESTERN AND                  BKLA AND
                                                                             BKLA        PENINSULA     PENINSULA
                                                                           PRO FORMA   (HISTORICAL)(1)  PRO FORMA
                                                                          -----------  -------------  -----------
<S>                                                                       <C>          <C>            <C>
                                                                           (IN THOUSANDS, EXCEPT PER SHARE DATA)
INTEREST INCOME:
  Interest and fees on loans and leases.................................   $  53,822     $  17,505     $  71,327
  Interest on interest bearing deposits in other banks..................          45            85           130
  Interest on investment securities.....................................      12,301         3,805        16,106
  Interest on federal funds sold........................................       3,280           348         3,628
                                                                          -----------  -------------  -----------
    TOTAL INTEREST INCOME...............................................      69,448        21,743        91,191
INTEREST EXPENSE:
  Interest expense on deposits..........................................      20,709         7,025        27,734
  Interest expense on borrowings........................................         947            70         1,017
                                                                          -----------  -------------  -----------
    TOTAL INTEREST EXPENSE..............................................      21,656         7,095        28,751
                                                                          -----------  -------------  -----------
NET INTEREST INCOME:....................................................      47,792        14,648        62,440
  Less: provision for loan and lease losses.............................       8,253           470         8,723
                                                                          -----------  -------------  -----------
    NET INTEREST INCOME AFTER PROVISION FOR LOAN AND LEASE LOSSES.......      39,539        14,178        53,717
NON-INTEREST INCOME:
  Service charges, commissions and fees.................................       7,308         2,651         9,959
  Gain on sale of loans and other assets................................         263        --               263
  Securities gains (losses).............................................        (738)           32          (706)
  Other income..........................................................       1,871           482         2,353
                                                                          -----------  -------------  -----------
    TOTAL NON-INTEREST INCOME...........................................       8,704         3,165        11,869
NON-INTEREST EXPENSE:
  Salaries and benefits.................................................      22,373         7,240        29,613
  Occupancy, furniture and equipment....................................       8,819         2,005        10,824
  Advertising and business development..................................       1,327           452         1,779
  Other real estate owned...............................................       3,104           450         3,554
  Professional services.................................................       3,723           277         4,000
  Telephone, stationery and supplies....................................       2,591           512         3,103
  Goodwill amortization.................................................         841        --               841
  Lower of cost or market adjustment on loans available for sale........         756        --               756
  Data processing.......................................................         822           499         1,321
  Customer services cost................................................         184           690           874
  Other.................................................................       6,579         1,255         7,834
                                                                          -----------  -------------  -----------
    TOTAL NON-INTEREST EXPENSE..........................................      51,119        13,380        64,499
                                                                          -----------  -------------  -----------
Income (loss) before income taxes.......................................      (2,876)        3,963         1,087
Income taxes (benefits).................................................      (1,733)        1,421          (312)
                                                                          -----------  -------------  -----------
    NET INCOME (LOSS)...................................................   $  (1,143)    $   2,542     $   1,399
                                                                          -----------  -------------  -----------
                                                                          -----------  -------------  -----------
PER SHARE INFORMATION(1):
  Number of shares (weighted average)
    Basic...............................................................     6,916.7       2,487.1       9,555.3
    Diluted.............................................................     7,134.4       2,487.1       9,773.0
  Income (loss) per share
    Basic...............................................................   $   (0.17)    $    1.02     $    0.15
    Diluted.............................................................   $   (0.17)    $    1.02     $    0.14
</TABLE>
    
 
   
 See "NOTES TO WESTERN--BKLA--PENINSULA UNAUDITED PRO FORMA COMBINED CONDENSED
                                FINANCIAL DATA".
    
 
                                       57
<PAGE>
   
             NOTES TO WESTERN--BKLA--PENINSULA UNAUDITED PRO FORMA
                       COMBINED CONDENSED FINANCIAL DATA
    
 
   
NOTE 1: BASIS OF PRESENTATION
    
 
   
    The accompanying Western--BKLA--Peninsula unaudited pro forma combined
condensed financial data combines (i) the pro forma consolidated condensed
financial statements of Western and BKLA giving effect to the Merger and (ii)
the historical financial statements of Peninsula giving effect to the Peninsula
Merger as if it had been effective on June 30, 1998 and December 31, 1997 with
respect to the Western-- BKLA--Peninsula Pro Forma Combined Condensed Balance
Sheets, and as of the beginning of the periods indicated with respect to the
Western--BKLA--Peninsula Pro Forma Combined Statements of Income. The
combination of the Western and BKLA pro forma financial statements with the
historical financial statements of Peninsula is presented under the
pooling-of-interests accounting method.
    
 
   
    Certain historical data of Peninsula have been reclassified on a pro forma
basis to conform to Western's classifications. Transactions between Western and
Peninsula are not material in relation to the unaudited pro forma combined
financial statements and have not been eliminated from the pro forma combined
amounts. The unaudited pro forma number of common shares outstanding, common
shareholders' equity per share, number of shares (basic and diluted) and income
(loss) per share (basic and diluted) are based on the share amounts for Western
and BKLA pro forma plus the historical share amounts for Peninsula multiplied by
an estimated Peninsula Conversion Number of 1.061, the approximate mid point of
the price range used to determine the exchange ratio.
    
 
   
NOTE 2: MERGER COSTS
    
 
   
    The Western--BKLA--Peninsula unaudited pro forma combined condensed
financial data reflects Western Management's current estimate, for purposes of
pro forma presentation, of the aggregate estimated merger costs of $8,515,000
($6,115,000 net of taxes, computed using the combined federal and state tax rate
of 41.5%) expected to be incurred in connection with the Peninsula Merger. While
a portion of these costs may be required to be recognized over time, the current
estimate of these costs has been recorded in the pro forma combined balance
sheets in order to disclose the aggregate effect of these activities on
Western's pro forma combined financial position. The estimated aggregate costs
include the following:
    
 
   
<TABLE>
<CAPTION>
                                                                               (DOLLARS IN
                                                                               THOUSANDS)
                                                                          ---------------------
<S>                                                                       <C>
Employee costs..........................................................        $   1,500
Conversion costs........................................................            1,000
Other costs.............................................................            3,300
                                                                                  -------
                                                                                    5,800
Tax effects.............................................................           (2,400)
                                                                                  -------
                                                                                    3,400
Investment banking and other professional fees..........................            2,715
                                                                                  -------
    TOTAL ESTIMATED AGGREGATE COSTS.....................................        $   6,115
                                                                                  -------
                                                                                  -------
</TABLE>
    
 
   
    Western Management's cost estimates are forward-looking. While the costs
represent Western Management's current estimate of merger costs that will be
incurred, the ultimate level and timing of recognition of such costs will be
based on the final merger and integration plan to be completed prior to
consummation of the Peninsula Merger, which will be developed by various of
Western's and Peninsula's task forces and integration committees. Readers are
cautioned that the completion of the merger and integration plan and the
resulting management plans detailing actions to be undertaken to effect the
Merger and resultant integration of operations will impact these estimates; the
type and amount of actual costs incurred could vary materially from these
estimates if future developments differ from the underlying assumptions used by
management in determining the current estimate of these costs.
    
 
                                       58
<PAGE>
                    THE SPECIAL MEETING OF BKLA SHAREHOLDERS
 
GENERAL
 
   
    This Proxy Statement-Prospectus is furnished in connection with the
solicitation by the BKLA Board of proxies representing BKLA Common Stock to be
voted at the BKLA Meeting to be held on September 23, 1998, and at any
postponement or adjournment thereof. This Proxy Statement-Prospectus and
accompanying proxy card are first being mailed to BKLA Shareholders on or about
August 18, 1998.
    
 
MATTERS TO BE CONSIDERED AT THE BKLA SPECIAL MEETING
 
   
    The purpose of the BKLA Meeting is to (a) consider and vote upon the
principal terms of the Merger; (b) set the number of directors at nine, and
consider and approve the election of nine directors to hold office until the
merger is consummated or, if the Merger is not consummated, until the next
annual meeting of BKLA and until their successors have been elected and duly
qualified; (c) ratify the appointment of Vavrinek as BKLA's independent public
accountants; and (d) transact such other business as may properly come before
the BKLA Meeting or any adjournments or postponements thereof.
    
 
   
    Based upon (a) the 4,911,256 shares of BKLA Common Stock outstanding on the
BKLA Record Date, (b) the 322,850 shares of BKLA Common Stock reserved for
issuance upon exercise of employee and director stock options to acquire BKLA
Common Stock outstanding on the BKLA Record Date and (c) the 506,974 shares of
BKLA Common Stock reserved for issuance upon exercise of warrants to acquire
BKLA Common Stock outstanding on the BKLA Record Date and assuming no
Dissenters' Rights are perfected by BKLA Shareholders and no cash is paid in
lieu of fractional shares, (i) in the event that no options, warrants or other
rights outstanding are exercised prior to the Effective Date, 2,156,468 shares
of Western Common Stock would be issued in the Merger, and (ii) in the event
that all options, warrants and rights outstanding are exercised prior to the
Effective Date, 2,425,033 shares of Western Common Stock would be issued in the
Merger. Based upon the 15,704,753 shares of Western Common Stock outstanding on
the BKLA Record Date, the 404,973 shares of Western Common Stock reserved for
issuance upon the exercise of employee and director stock options to acquire
Western Common Stock on the BKLA Record Date and the 140,675 shares of Western
Common Stock reserved for issuance upon the exercise of warrants to acquire
Western Common Stock outstanding on the BKLA Record Date, and assuming no
Dissenters' Rights are perfected by BKLA Shareholders, and no cash is paid in
lieu of fractional shares: (i) in the event that no options, warrants or other
rights outstanding of BKLA and Western Common Stock are exercised prior to the
Effective Date, shares held by BKLA Shareholders after consummation of the
Merger would represent 12.1% of Western Common Stock, and (ii) in the event that
all options, warrants and rights outstanding of BKLA and Western Common Stock
are exercised prior to the Effective Date, shares held by BKLA Shareholders
after consummation of the Merger, would represent 13.0% of Western Common Stock.
Consummation of the Merger is subject to satisfaction of a number of conditions,
including the receipt of various regulatory approvals for the Merger, and the
approval of the principal terms of the Merger by BKLA Shareholders. See "MERGER
AGREEMENT--Conditions".
    
 
   
    The Merger Agreement provides, among other things, that Adriana M. Boeka
will be appointed to the Western Board at the time the Merger is consummated.
Accordingly, at the Effective Time, the Western Board will adopt resolutions
increasing the number of Western directors by one and appoint Ms. Boeka to fill
the vacancy created thereby. The directors and certain officers of BKLA as
specified by Western will be required to resign, effective upon consummation of
the Merger. See "THE MERGER--Certain Effects of the Merger". In the event that
the Merger is not consummated as contemplated, all directors of BKLA elected at
the BKLA Meeting will continue to serve as directors of BKLA until the next
annual meeting of BKLA and until their successors have been elected and duly
qualified.
    
 
                                       59
<PAGE>
THE BKLA RECORD DATE
 
   
    The BKLA Board has fixed the close of business on July 27, 1998 as the BKLA
Record Date for the determination of the BKLA Shareholders entitled to receive
notice of, and to vote at, the BKLA Meeting. Only holders of record of shares of
BKLA Common Stock at the close of business on the BKLA Record Date will be
entitled to notice of, and to vote at, the BKLA Meeting and any postponements or
adjournments thereof. On the BKLA Record Date, 4,911,256 shares of BKLA Common
Stock were issued and outstanding.
    
 
VOTES REQUIRED AND VOTING OF PROXIES
 
   
    In advance of the BKLA Meeting, the BKLA Board will appoint three persons,
other than nominees for office, as inspectors of the election, whose duties will
be those set forth in Section 707 of the CGCL, among which are determining the
shares represented at the meeting, determining the existence of a quorum,
determining the authenticity, validity and effect of proxies, and counting and
tabulating all votes or consents as to all matters presented to the BKLA
Shareholders. A majority of all shares of BKLA Common Stock entitled to vote,
represented in person or by proxy, constitutes a quorum. Abstentions will each
be included in the determination of the number of shares present; however, they
will not be counted as votes in favor of the principal terms of the Merger.
Subject to the cumulative voting rights described below with respect to the
election of directors, each share of BKLA Common Stock held of record will be
entitled to one vote upon each matter properly submitted to the BKLA
Shareholders at the BKLA Meeting and any postponement or adjournment thereof.
    
 
   
    Under applicable California law, shareholders are not entitled to cumulate
votes for a candidate for election as director unless that candidate's name has
been placed in nomination prior to the voting and the shareholder has given
notice at the meeting, prior to the voting, of the shareholder's intention to
cumulate the shareholder's votes. Cumulative voting permits a shareholder to
give one candidate a number of votes equal to the number of directors to be
elected, multiplied by the number of votes to which the shareholder's shares are
entitled, or to distribute such votes on the same principle among as many
candidates as the shareholder thinks fit.
    
 
    The affirmative vote of the holders of at least a majority of the total
number of outstanding shares of BKLA Common Stock entitled to vote at the BKLA
Meeting is required to approve the principal terms of the Merger. The failure to
vote, an abstention or a broker non-vote thus has the same effect as a vote
against the principal terms of the Merger.
 
    Each share of BKLA Common Stock represented by a proxy properly executed and
received by BKLA in time to be voted at the BKLA Meeting and not revoked will be
voted in accordance with the instructions indicated on such proxy and, if no
instructions are indicated, will be voted "FOR" the proposal to approve the
principal terms of the Merger and, in the case of the election of directors of
BKLA, equally "FOR" each of the nine candidates for the office of director of
BKLA named in this Proxy Statement-Prospectus; however, if sufficient numbers of
BKLA Shareholders exercise cumulative voting rights to elect one or more
candidates, the named proxies will determine the number of directors they are
entitled to elect, such number from the named candidates, cumulate their votes,
and cast their votes for each candidate among the number they are entitled to
elect. All proxies voted "FOR" such matters, including proxies on which no
instructions are indicated, may, at the discretion of the proxy-holder, be voted
"FOR" a motion to adjourn or postpone the BKLA Meeting to another time and/or
place for the purpose of soliciting additional proxies or otherwise. Any proxy
that is voted against approval of the principal terms of the Merger or on which
the relevant BKLA Shareholder specifically abstains from voting with respect to
such approval will not be voted in favor of any such adjournment or
postponement.
 
    The BKLA Board is not currently aware of any business to be acted upon at
the BKLA Meeting other than as described herein. If, however, other matters are
properly brought before the BKLA Meeting, persons appointed as proxies will have
discretion to vote or act thereon in their best judgment.
 
                                       60
<PAGE>
   
    Certain BKLA Shareholders, all of whom are directors or trustee for estates
of former directors of BKLA, holding approximately 18.0% of BKLA Common Stock
outstanding on the BKLA Record Date have agreed, among other things, to vote
"FOR" the adoption and approval of the Merger Agreement and the Merger. However,
the shareholder/directors are bound by the Shareholder Agreements only in their
capacity as shareholders. As directors, they are bound by their fiduciary duties
to act in the best interest of Peninsula when they decide whether to approve the
Merger. See "THE SHAREHOLDER AGREEMENTS".
    
 
   
    If a quorum is not obtained, or fewer shares of BKLA Common Stock are voted
in favor of the principal terms of the Merger than the number required for
approval of the principal terms of the Merger, in accordance with Section 602 of
the CGCL, it is expected that the BKLA Meeting will be postponed or adjourned
for the purpose of allowing additional time to obtain additional proxies or
votes, and at any subsequent reconvening of the BKLA Meeting, all proxies will
be voted in the same manner as such proxies would have been voted at the
original convening of the BKLA Meeting (except for any proxies that have
theretofore effectively been revoked or withdrawn).
    
 
SOLICITATION OF PROXIES
 
    The cost of soliciting proxies relating to the BKLA Meeting will be paid by
BKLA. In addition to solicitation of proxies by the use of mail, directors,
officers and employees of BKLA and its subsidiaries may solicit proxies from
BKLA Shareholders personally or by telephone or telegram without additional
remuneration therefor. BKLA also will provide persons, firms, banks and
corporations holding shares in their names or in the names of nominees, which in
any case are beneficially owned by others, with proxy materials for transmittal
to such beneficial owners and will reimburse such record owners for their
expenses of doing so.
 
REVOCABILITY OF PROXIES
 
    The presence of a BKLA Shareholder at the BKLA Meeting (or at any
postponement or adjournment thereof) will not automatically revoke such BKLA
Shareholder's proxy. However, a BKLA Shareholder may revoke a proxy at any time
prior to its exercise by (a) delivery to the Secretary of BKLA of a written
notice of revocation prior to or at the BKLA Meeting (or, if the BKLA Meeting is
adjourned or postponed, prior to or at the time the adjourned or postponed
meeting is actually held); (b) delivery to the Secretary of BKLA prior to or at
the BKLA Meeting (or, if the BKLA Meeting is adjourned or postponed, prior to or
at the time the adjourned or postponed meeting is actually held) of a duly
executed proxy bearing a later date; or (c) attending the BKLA Meeting (or, if
the BKLA Meeting is adjourned or postponed, by attending the adjourned or
postponed meeting) and voting in person thereat. Any written revocation of proxy
or other related communications should be addressed to Beverly A. Dyck, Vice
President and Corporate Secretary, 8901 Santa Monica Boulevard, West Hollywood,
California 90069.
 
SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT OF BKLA
 
   
    As of the BKLA Record Date, the directors and officers of BKLA beneficially
held, in the aggregate, the ability to direct the voting with respect to 703,520
shares of BKLA Common Stock, comprising approximately 14.3% of the voting power
of the BKLA Common Stock outstanding. The directors and executive officers of
BKLA have informed BKLA that they intend to vote their shares of BKLA Common
Stock for the approval of the principal terms of the Merger.
    
 
    The following table reflects as of the BKLA Record Date the beneficial
ownership of BKLA Common Stock, including stock options that will become
exercisable within 60 days, by BKLA's directors, executive officers and
shareholders known to BKLA to be holding more than 5% of such stock, and by
BKLA's directors and officers as a group.
 
                                       61
<PAGE>
 
   
<TABLE>
<CAPTION>
                                                                       AMOUNT AND NATURE OF
                                                                            BENEFICIAL          PERCENTAGE OF CLASS
NAME AND TITLE                                                             OWNERSHIP(1)        BENEFICIALLY OWNED(2)
- --------------------------------------------------------------------  ----------------------  -----------------------
<S>                                                                   <C>                     <C>
Adriana M. Boeka....................................................       Shares     39,175               1.8%
  Chairman of the Board of Directors                                       Warrants   17,365
                                                                             Options  31,000
                                                                          Total       87,540
 
Alix Truax, as Trustee for the......................................       Shares    181,091               5.9%
  1998 Morry J. Burford Revocable Trust(3)                                 Warrants   79,842
  3050 Crestview Drive South                                                 Options  37,500
  Salem, Oregon 97302                                                     Total      298,433
 
Mary Anne Chalker...................................................       Shares     12,585               0.4%
  Director                                                                 Warrants      500
                                                                           Options     7,800
                                                                          Total       20,885
 
Roy Doumani.........................................................       Shares     97,913               2.1%
  Director                                                                 Options     6,000
                                                                          Total      103,913
 
John J. Feldman.....................................................       Shares     81,750               3.1%
  Director, President and Chief Executive Officer                            Options  75,000
                                                                          Total      156,750
 
Rickey M. Gelb......................................................       Shares     73,000               1.6%
  Director                                                                    Options  6,000
                                                                          Total       79,000
 
John R. Newhouse....................................................       Shares    144,883               3.1%
  Director and Senior Vice President, Business Development                    Options  6,000
                                                                          Total      150,883
 
James V. Reimann(4).................................................       Shares     97,239               2.9%
  Director                                                                 Warrants   42,967
                                                                              Options  6,000
                                                                          Total      146,206
 
Melvin F. Shaw......................................................       Shares     76,475               1.7%
  Director                                                                    Options  6,000
                                                                          Total       82,475
 
Burton N. Sterman...................................................       Shares     72,950               1.6%
  Director                                                                    Options  6,000
                                                                          Total       78,950
 
Robert G. Jacobsen..................................................       Shares      1,550               0.5%
  Executive Vice President and Chief Credit Officer                        Warrants      100
                                                                             Options  22,750
                                                                          Total       24,400
 
Wendy R. Moskal.....................................................      Shares(5)    6,000               0.6%
  Executive Vice President and Chief Operating Officer                       Options  24,000
                                                                          Total       30,000
</TABLE>
    
 
                                       62
<PAGE>
   
<TABLE>
<CAPTION>
                                                                       AMOUNT AND NATURE OF
                                                                            BENEFICIAL          PERCENTAGE OF CLASS
NAME AND TITLE                                                             OWNERSHIP(1)        BENEFICIALLY OWNED(2)
- --------------------------------------------------------------------  ----------------------  -----------------------
<S>                                                                   <C>                     <C>
All directors and executive officers as a group
  (11 persons)(6)...................................................       Shares    703,520              18.6%
                                                                           Warrants   60,932
                                                                           Options   196,550
                                                                          Total      961,002
</TABLE>
    
 
- ------------------------
 
   
(1) The term "Beneficial Owner" includes any person who, directly or indirectly,
    through any contract, arrangement, understanding, relationship, or otherwise
    has or shares: (a) voting power, which includes the power to vote, or to
    direct the voting power, of such security; and/or (b) investment power,
    which includes the power to dispose, or to direct the disposition of, such
    security. The term "beneficial owner" also includes any person who has the
    right to acquire beneficial ownership of such security as defined above
    within 60 days of the BKLA Record Date. Ownership includes stock options and
    warrants exercisable within 60 days of the BKLA Record Date. Except as
    disclosed in notes 3 through 5, all shares held by directors, executive
    officers and shareholders are with their sole investment power.
    
 
(2) In computing the percentage of shares beneficially owned, the number of
    shares which the person or group has the right to acquire within 60 days of
    the BKLA Record Date are deemed outstanding for the purposes of computing
    the percentage of BKLA Common Stock beneficially owned by such person or
    group, but are not deemed outstanding for the purpose of computing the
    percentage of shares beneficially owned by any other person.
 
   
(3) The 1998 Morry J. Burford Revocable Trust was set up for Maurice J. Burford
    who died on May 6, 1998. On that date, all of the shares of BKLA Common
    Stock, vested options and warrants owned by Mr. Burford were transferred to
    the 1998 Morry J. Burford Revocable Trust. Upon Mr. Burford's death all
    unvested options terminated pursuant to BKLA's stock option plan resulting
    in the termination of 37,500 unvested options. Alix Truax, Trustee of the
    Trust, has all voting rights for the Trust. Ms. Truax's spouse, Mike Truax,
    owns 10,331 shares of Common Stock with Rob Douglas. Ms. Truax's daughter,
    Catherine Kitzmiller, owns 15,727 shares of Common Stock and 6,086 Warrants
    to acquire BKLA Common Stock.
    
 
(4) Mr. Reimann has 51% ownership in Vintage Investment Group, which owns 74,002
    shares of BKLA Common Stock and 33,111 warrants to acquire BKLA Common
    Stock. Mr. Reimann's spouse, Beverly Reimann, owns 10,575 shares of BKLA
    Common Stock and 3,525 warrants to acquire BKLA Common Stock.
 
   
(5) The 6,000 shares are held in joint tenancy with John W. Moskal.
    
 
   
(6) Does not include shares held by the 1998 Morry J. Burford Revocable Trust,
    which is controlled by Alix Truax who is neither a director nor an executive
    officer. If the trust's shares, warrants and options were to be combined and
    added to the totals, the sums would be 884,611, 140,774 and 234,050,
    respectively, for a total of 1,259,435, and a combined percentage of class
    beneficially owned of 23.8%.
    
 
DISSENTERS' RIGHTS
 
    If the principal terms of the Merger are approved by the BKLA Shareholders,
holders of BKLA Common Stock who elect to dissent from the approval of the
principal terms of the Merger may be entitled to have their shares purchased in
accordance with Chapter 13 of the CGCL. IN ORDER FOR A BKLA SHAREHOLDER TO
EXERCISE DISSENTERS' RIGHTS, A NOTICE OF SUCH SHAREHOLDER'S INTENTION TO
EXERCISE HIS OR HER DISSENTERS' RIGHTS AS PROVIDED IN THE CGCL MUST BE SENT BY
SUCH SHAREHOLDER AND RECEIVED BY BKLA ON OR BEFORE THE DATE OF THE BKLA MEETING,
AND ANY SUCH SHAREHOLDER MUST VOTE AGAINST THE APPROVAL OF THE PRINCIPAL TERMS
OF THE MERGER AND COMPLY WITH SUCH OTHER PROCEDURES AS REQUIRED BY THE CGCL, AS
MORE
 
                                       63
<PAGE>
FULLY DESCRIBED BELOW IN "THE MERGER--DISSENTERS' RIGHTS". FAILURE TO SEND SUCH
NOTICE, TO VOTE AGAINST THE PRINCIPAL TERMS OF THE MERGER OR TO FOLLOW SUCH
OTHER PROCEDURES WILL RESULT IN A WAIVER OF SUCH SHAREHOLDER'S DISSENTERS'
RIGHTS. See "SUMMARY--Dissenters' Rights" and "THE MERGER--Dissenters' Rights"
for a discussion of Dissenters' Rights and a description of the procedures that
must be followed to perfect such rights.
 
ELECTION OF BKLA DIRECTORS
 
    The persons named below have been nominated for election to serve as
directors of BKLA. In the event that the Merger is not consummated, all
directors of BKLA elected at the BKLA Meeting will continue to serve as
directors of BKLA until the next annual meeting of BKLA and until their
successors have been elected and duly qualified.
 
    The bylaws of BKLA currently provide that nominations for election of
members of the BKLA Board may be made by the BKLA Board or by any shareholder of
any outstanding class of voting stock of BKLA entitled to vote for the election
of directors. Notice of intention to make any nominations, other than by the
BKLA Board, shall be made in writing and shall be received by the President and
Chief Executive Officer of BKLA no more than 60 days prior to any meeting of
Shareholders called for the election of directors, no more than ten days after
the date the notice of such meeting is sent to shareholders pursuant to Section
2.2 of BKLA's bylaws, and not later than the time fixed in the notice of the
BKLA meeting for the opening of the BKLA meeting. Notification shall contain the
following information to the extent known to the notifying shareholder: (a) the
name and address of each proposed nominee; (b) the principal occupation of each
proposed nominee; (c) the number of shares of voting stock of BKLA owned by each
proposed nominee; (d) the name and residence address of the notifying
shareholder; and (e) the number of shares of voting stock of BKLA owned by the
notifying shareholder. Nominations made without nominee information may be
disregarded by the Chairman of the meeting, and the election inspectors shall
disregard all votes cast for each nominee. See "--Votes Required and Voting of
Proxies".
 
    The following table sets forth information concerning BKLA's nominees for
directors:
 
<TABLE>
<CAPTION>
                                                                                       YEAR FIRST
                                                                                       ELECTED OR
NAME                                             TITLE                     AGE         APPOINTED
- ---------------------------------  ----------------------------------  -----------  ----------------
<S>                                <C>                                 <C>          <C>
Adriana M. Boeka.................  Chairman of the Board                   47             1996
Mary Anne Chalker................  Director                                68             1981
Roy Doumani......................  Director                                62             1996
John J. Feldman..................  President/CEO and Director              66             1997
Rickey M. Gelb...................  Director                                53             1997
John R. Newhouse.................  Senior Vice President/Director          43             1998
James V. Reimann.................  Director                                58             1995
Melvin F. Shaw...................  Director                                62             1997
Burton N. Sterman................  Director                                65             1997
</TABLE>
 
    Adriana M. Boeka. Chairman of the Board since May 6, 1998. Vice Chairman of
BKLA from October 1997 to May 1998. Principal of Manex Group, a business and
management consulting corporation from 1995 to present; Senior Vice
President/Division Manager at Union Bank of California from 1987 to 1995.
 
    Mary Anne Chalker. Board member of BKLA since inception in 1981; Insurance
Broker and President of LFC Insurance Brokers & Agents, Inc. from 1950 to
present.
 
    Roy Doumani. Former Chairman of the Board of WTB from 1982 to 1995;
currently Mr. Doumani is retired and is a private investor.
 
                                       64
<PAGE>
   
    John J. Feldman. President and Chief Executive Officer of BKLA from April
1997 to the present; President and Chief Executive Officer from August 1993 to
March 1997 of AWB.
    
 
    Rickey M. Gelb. General Partner of Gelb Enterprises a real estate and
property management company since 1955.
 
   
    John R. Newhouse. Senior Vice President/Business Development of BKLA from
January 1998 to present; President/Chief Executive Officer of CNB from January
1991 to December 1997.
    
 
    James V. Reimann. Board member of BKLA since 1995; President of Reimann
Associates, a real estate development and sales company since December 1987;
President of Pacific Management Company, a real estate management company; and
Director of R.B. Rubber since 1995.
 
    Melvin F. Shaw. President and Chief Executive Officer of Accounts Receivable
and Resource Management Company from 1968 to present.
 
    Burton N. Sterman. Certified Public Accountant with Brown & Sterman,
Accountancy Corporation for the past 26 years.
 
CERTAIN COMMITTEES OF THE BKLA BOARD
 
    BKLA has no Nominating Committee. The procedures for nominating directors,
other than by the BKLA Board itself, are set forth in BKLA's bylaws.
 
   
    The Audit Committee of BKLA is chaired by Mary Anne Chalker, and includes as
current members, directors Mary Anne Chalker, James V. Reimann and Burton N.
Sterman. The Audit Committee meets every other month and met six times during
1997. The purpose of the Audit Committee is to review audit reports generated by
R. Maslac Associates and Vavrinek, outside consulting firms. In addition, the
Audit Committee reviews all internal audits and examinations and management's
response. It is also the responsibility of this Committee to recommend to BKLA's
Board the appointment of independent auditors and to meet with these auditors
for the review of the audit of the financial statements.
    
 
    The BKLA Compensation/Stock Option Committee was chaired by Maurice J.
Burford until his death on May 6, 1998. Roy Doumani and James V. Reimann are the
remaining two committee members. The Compensation/Stock Option Committee meets
on an as-needed basis and met three times during 1997. The Compensation/Stock
Option Committee is responsible for setting the compensation for the Chief
Executive Officer and awarding stock options to all employees and directors. The
Compensation/Stock Option Committee answers to the BKLA Board, and
recommendations from this Committee are submitted to the BKLA Board for
ratification or approval.
 
    During 1997, the Board of Directors of BKLA met twelve times. Each of the
persons who is a current member of the Board of Directors of BKLA, and was
serving as a member of BKLA Board in 1997, attended at least 75% of the
aggregate of (i) the total number of meetings of BKLA's Board held during the
time such a person was a director and (ii) the total number of meetings held by
all committees of the BKLA Board during the time such person served on such
committees.
 
BKLA DIRECTOR COMPENSATION
 
    BKLA outside directors are compensated $500 for each meeting of the BKLA
Board. In addition, outside directors are compensated $150 for each committee
meeting attended that is not held on the day of the monthly BKLA Board meeting.
 
                                       65
<PAGE>
BKLA EXECUTIVE OFFICERS
 
    The following table sets forth, as to each of the persons who currently
serves as an Executive Officer of BKLA, such person's age, position with BKLA,
and the period during which the person has served in such position:
 
<TABLE>
<CAPTION>
                                                                                       YEAR FIRST
                                                                                       ELECTED OR
NAME                                             TITLE                     AGE         APPOINTED
- ---------------------------------  ----------------------------------  -----------  ----------------
<S>                                <C>                                 <C>          <C>
Adriana M. Boeka.................  Chairman of the Board                   47             1996
John J. Feldman..................  President/CEO and Director              66             1997
</TABLE>
 
   
COMPENSATION OF BKLA EXECUTIVE OFFICERS
    
 
    The following table reflects all compensation paid to John J. Feldman, the
President and Chief Executive Officer, Maurice J. Burford, BKLA's former
Chairman of the Board and Adriana M. Boeka, the current Chairman of the Board,
who were the only executive officers receiving a total annual salary and bonus
of $100,000 or more.
 
<TABLE>
<CAPTION>
                                                                                        LONG-TERM COMPENSATION
                                                     ANNUAL COMPENSATION                        AWARDS
                                                ------------------------------         -------------------------
                                                                 AWARDS                SECURITIES    ALL OTHER
                                                          --------------------         UNDERLYING   COMPENSATION
                                          YEAR   SALARY   BONUS      OTHER              OPTIONS         (1)
                                          ----  --------  -----   ------------         ----------   ------------
<S>                                       <C>   <C>       <C>     <C>                  <C>          <C>
John J. Feldman.........................  1997  $138,750  $406         --                75,000        $2,775
  President and Chief Executive
    Officer(2)
 
Maurice J. Burford(3)...................  1997   110,000   441         --                 --            2,199
  Former Chairman of the Board            1996   145,000   441         --                37,500         3,088
                                          1995   108,000   --          --                 --              795
 
Adriana M. Boeka(4).....................  1997    19,602   435          29,200(5)(6)      --           --
  Current Chairman of the Board
</TABLE>
 
- ------------------------
 
(1) Employer contributions for 401K retirement plans.
 
(2) Mr. Feldman's annual salary is $185,000.
 
(3) Deceased on May 6, 1998.
 
(4) Ms. Boeka's current annual salary of $110,000 became effective as of October
    29, 1997. She also received 25,000 options on January 21, 1998.
 
(5) Amount represents $6,200 in fees paid for attending meetings of the BKLA
    Board of Directors and BKLA Audit Committee.
 
   
(6) Amount represents $23,000 in fees paid for consulting services as an outside
    director prior to being appointed vice-chairman.
    
 
                                       66
<PAGE>
    The following table sets forth certain information regarding the options
exercised by those certain executive officers during 1997 and the value of
unexercised options held by those executive officers at December 31, 1997.
 
BKLA AGGREGATED OPTION EXERCISE AND OPTION VALUES AS OF DECEMBER 31, 1997
 
<TABLE>
<CAPTION>
                                                               NUMBER OF SECURITIES
                                                              UNDERLYING UNEXERCISED       VALUE OF UNEXERCISED
                                                                    OPTIONS AT           IN-THE-MONEY OPTIONS AT
                                    SHARES                     DECEMBER 31, 1997(#)        DECEMBER 31, 1997($)
                                  ACQUIRED ON     VALUE     --------------------------  --------------------------
NAME                              EXERCISE(#)  REALIZED($)  EXERCISABLE  UNEXERCISABLE  EXERCISABLE  UNEXERCISABLE
- --------------------------------  -----------  -----------  -----------  -------------  -----------  -------------
<S>                               <C>          <C>          <C>          <C>            <C>          <C>
Maurice J. Burford..............      --           --           18,750        56,250     $ 185,156    $   555,469
Adriana M. Boeka................      --           --            1,500         4,500     $  14,813    $    44,438
John J. Feldman.................      --           --           --            75,000     $  --        $   523,125
</TABLE>
 
   
BKLA OPTIONS GRANTED FOR THE YEAR ENDING DECEMBER 31, 1997(1)
    
 
<TABLE>
<CAPTION>
                                       NUMBER OF     PERCENTAGE OF
                                      SECURITIES     TOTAL OPTIONS                                        GRANT DATE
                                      UNDERLYING      GRANTED TO                                            PRESENT
NAME                                    OPTIONS        EMPLOYEES      EXERCISE PRICE   EXPIRATION DATE     VALUE(2)
- ------------------------------------  -----------  -----------------  ---------------  ---------------  ---------------
<S>                                   <C>          <C>                <C>              <C>              <C>
John J. Feldman.....................      75,000             45%         $    6.90        May 20, 2007    $   276,000
</TABLE>
 
- ------------------------
 
   
(1) Adriana M. Boeka received 25,000 options on January 21, 1998 at an exercise
    price of $11.05 expiring on January 21, 2008.
    
 
(2) Value of stock option was determined at date of grant using the
    Black-Scholes model.
 
CERTAIN BKLA TRANSACTIONS
 
    Mr. Feldman became the President and Chief Executive Officer of BKLA,
effective April 1, 1997, as a result of the merger of AWB with and into BKLA.
Mr. Burford was the Chairman of the Board of BKLA. Ms. Boeka, previously the
Vice Chairman, was appointed Chairman of the Board on May 6, 1998, upon Mr.
Burford's death.
 
    Some of the directors, officers and principal shareholders of BKLA, and the
businesses with which they are associated, were customers of, and had banking
transactions with, BKLA in the ordinary course of BKLA's business during 1997.
All loans and commitments to lend included in such transactions were made in
compliance with applicable laws and on substantially the same terms, including
interest rates, collateral and repayment terms, as those prevailing at the time
for comparable transactions with other persons of similar creditworthiness and,
in the opinion of management of BKLA, did not involve more than a normal risk of
collectability or present other unfavorable features. As of December 31, 1997
the aggregate principal amount of extensions of credit to directors and
executive officers and related interests was $1,601,000 which represents
approximately 5% of BKLA's shareholder's equity as of December 31, 1997.
 
  EMPLOYMENT AGREEMENT
 
   
    BKLA has entered into a contract with John R. Newhouse, former President and
Chief Executive Office of CNB, pursuant to which Mr. Newhouse will be employed
by BKLA from December 31, 1997 through December 31, 1999. During this period,
Mr. Newhouse will serve as Senior Vice President of the Culver City Branch.
    
 
    The employment agreement may be terminated by BKLA for reasons of death,
disability or for cause (as defined therein), or by Mr. Newhouse for any reason
with written notice. The employment agreement may be terminated by BKLA at will,
however, Mr. Newhouse is then entitled to six months salary upon a
 
                                       67
<PAGE>
30-day written notice, or if the term of the contract remaining is less than six
months, pay equal to the months remaining.
 
BKLA COMPENSATION/STOCK OPTION COMMITTEE REPORT
 
    BKLA's executive compensation program is designed to attract, reward and
retain highly qualified executives and to encourage the achievement of business
objectives, including superior corporate performance. Total compensation to
BKLA's executive management is composed of base salary, annual bonuses and stock
option awards. Base salaries for executive management are determined by
evaluating the responsibilities associated with the position held and an
individual's overall level of experience.
 
    BKLA's compensation program also includes stock option awards, which are
intended to provide additional incentive to increase stockholder value. All
stock option awards were granted with an exercise price equal to the fair market
value of BKLA's stock on the date of grant and become exercisable over four
years on a pro rata basis. Because BKLA stock option awards provide value only
in the event of share price appreciation, the Committee believes stock options
represent an important component of a well-balanced incentive program.
Individual awards are based upon a subjective evaluation of each individual's
overall past and expected future contribution; therefore, no specific formula is
used to determine option awards for any employee. Key employees are eligible to
receive stock options. The Committee also believes that BKLA is successfully
pursuing strategic growth and strengthening its position as a community bank in
a highly competitive environment.
 
    Mr. Feldman, President and Chief Executive Officer, was allocated the
largest number of shares in stock option awards for 1997, together with the base
salary of $185,000. The Committee believed that the total compensation was at
market and did not require adjustment in 1998. In setting Mr. Feldman's
compensation, the Committee also took into account the compensation levels of
Chief Executive Officers at BKLA's peer companies and the compensation of other
executive officers of BKLA.
 
   
    Adriana M. Boeka, a non-employee director since 1996, was appointed Vice
Chairman of the Board on October 29, 1997 as an employee. Ms. Boeka's
compensation was set at $110,000 annually, with 25,000 BKLA stock options to be
granted in conjunction with future employee grants. The salary of the previous
Chairman of the Board, Maurice J. Burford, was reduced to $25,000 annually at
that time.
    
 
   
    No current member of the BKLA Compensation/Stock Option Committee is a
former or current employee of BKLA or any of its subsidiaries. However, Maurice
J. Burford, who chaired the committee until his death on May 6, 1998, was also
the Chairman of the BKLA Board.
    
 
    The committee's report was completed as of January 21, 1998. The members of
the BKLA Compensation/Stock Option Committee filing the report were Maurice J.
Burford, Roy Doumani and James V. Reimann.
 
BKLA PERFORMANCE GRAPH
 
    The following line graph compares the yearly percentage change in BKLA's
cumulative total shareholder return on BKLA Common Stock as measured by the
difference between BKLA's share price for the five years presented. BKLA has not
issued dividends in the five years presented for use in determining total
shareholder return. The cumulative total shareholder return of BKLA is compared
to the Nasdaq Bank Stock Index and the Nasdaq Stock Market Total Return Index as
prepared for Nasdaq by the Center for Research in Security Prices at the
University of Chicago.
 
   
    BKLA began trading on Nasdaq on July 29, 1996. Prior to that date, BKLA
Common Stock was traded on a very limited basis on the over-the-counter market
through various brokerage firms and records of those trades are not available.
Consequently, the prices listed before that date represent quotations by dealers
making a market in BKLA Common Stock and reflect inter-dealer prices, without
adjustments for mark-ups, mark-downs or commissions, and may not necessarily
represent actual transactions. Prior to July
    
 
                                       68
<PAGE>
   
29, 1996, trading in BKLA Common Stock was limited in volume and may not be a
reliable indicator of its market value. To compute the change in the cumulative
total shareholder return on BKLA Common Stock, the 1993 stock market price of
BKLA was derived from various brokerage firms that were market makers for BKLA
stock reporting the high sale price in the fourth quarter. The source of the
data for 1994 and 1995 is Black and Company, reporting the high sale price in
the fourth quarter. The stock market prices for the years 1996 and 1997 are the
BKLA share price at the end of those years, as listed on Nasdaq.
    
 
                               PERFORMANCE GRAPH
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<CAPTION>
             BKLA      NASDAQ BANKS    NASDAQ INDEX
<S>        <C>        <C>             <C>
1992             100             100             100
1993              23             114             115
1994              27             114             112
1995              29             169             139
1996              46             223             195
1997             101             377             240
</TABLE>
 
                                       69
<PAGE>
                                   THE MERGER
 
    THIS SECTION OF THE PROXY STATEMENT-PROSPECTUS DESCRIBES CERTAIN ASPECTS OF
THE PROPOSED MERGER, AND SUCH INFORMATION IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO THE OTHER INFORMATION CONTAINED ELSEWHERE IN THIS PROXY
STATEMENT-PROSPECTUS, INCLUDING THE APPENDICES HERETO, AND THE DOCUMENTS
INCORPORATED HEREIN BY REFERENCE. A COPY OF THE MERGER AGREEMENT IS SET FORTH AS
APPENDIX A TO THIS PROXY STATEMENT-PROSPECTUS AND THE TEXT THEREOF IS
INCORPORATED HEREIN BY REFERENCE, AND REFERENCE IS MADE THERETO FOR A COMPLETE
DESCRIPTION OF THE TERMS OF THE MERGER. SHAREHOLDERS ARE URGED TO READ CAREFULLY
THE MERGER AGREEMENT AND EACH OF THE OTHER APPENDICES HERETO IN THEIR ENTIRETY.
 
BACKGROUND AND REASONS FOR THE MERGER
 
   
    Western, principally through its wholly-owned subsidiary Santa Monica Bank,
and BKLA each conducts general banking operations in western Los Angeles County.
In serving individuals, small businesses and mid-market corporations, each
historically has focused on a community-based approach to banking. Management of
each of Western and BKLA has been cognizant of the rapidly changing structure of
the banking market in Southern California and Los Angeles County, in part as a
result of the severe problems associated with the savings and loan industry and
the problems experienced by other independent banks within Los Angeles County
during the recent recession. As is the case throughout the United States, the
managements of Western and BKLA believe that a process of consolidation will
continue to occur in the Southern California financial services industry
resulting in, among other things, a reduction in the number of community and
independent banks.
    
 
   
    In order to compete effectively with the larger financial institutions that
Western Management believed would result from the various consolidations and
mergers in the industry locally, Western Management saw a need to expand
prudently and recognized the opportunity to build a larger regional, independent
financial institution in the Los Angeles County market. Accordingly, as a part
of its effort to achieve long-term, stable profitability, Western has explored
acquisition opportunities to achieve greater market share in Los Angeles County
and in Southern California.
    
 
    In 1995 a small group of investors recapitalized BKLA. One of the
attractions of the investment was the opportunity to acquire and/or combine with
other California banks whose stock prices were then depressed due to the very
difficult economic conditions at that time. Between 1995 and 1997, BKLA was
successful in acquiring and/or combining with three other community banks. See
"SUMMARY--Summary Unaudited Pro Forma Combined Financial Data".
 
    By mid 1997, however, the economy in California had improved significantly,
and along with it the prices of California bank stocks had also risen. In
October 1997, BKLA Management asked GBS Financial, its investment bankers, to
analyze the opportunities available to BKLA, including the opportunities for
acquisitions. GBS Financial advised that, given the recent and dramatic
appreciation in California bank stocks, the opportunities for acquisitions for
BKLA were very limited.
 
    BKLA Management and GBS Financial, independently and jointly, reviewed
BKLA's strategic plan and compared the results that could be achieved by
pursuing that plan with the results that could be achieved by modifying BKLA's
strategic plan or being acquired by a larger institution, including an analysis
of bank and bank holding company mergers, discounted cash flow analysis, and
comparable bank and bank holding data. BKLA Management concluded that
shareholder value would be maximized by a merger with a larger bank.
 
   
    The BKLA Board, at their regular meeting on October 29, 1997, authorized the
engagement of an investment banking firm to pursue a merger with a larger
partner. After researching various firms, on December 31, 1997, GBS Financial
was retained. On January 20, 1998, GBS Financial was directed to identify a
group of the most desirable and compatible acquisition candidates and to
approach that group
    
 
                                       70
<PAGE>
   
regarding a potential transaction. BKLA Management decided to approach only the
most desirable candidates regarding a transaction to keep knowledge of the
transaction to a minimum.
    
 
   
    The decision by BKLA Management to keep knowledge of a potential sale to a
minimum was preceded by a financially difficult period two years earlier, which
culminated in a capital infusion. Prior to the capital infusion, the financial
difficulties had caused employee demoralization and customer base erosion. BKLA
Management believes its employees are its most valuable asset and felt that
widespread knowledge of a potential sale would again negatively affect employee
morale. Also, considerable resources in client retention and new client
relationships had been expended, and it was felt that knowledge of a potential
sale could adversely affect BKLA's customer base. The BKLA Board and Management
believed that selecting the most qualified acquisition candidates, soliciting
bids from each and selecting a winning bid, while retaining a motivated staff
and high level of customer service, would maximize shareholder value.
    
 
   
    BKLA Management subsequently narrowed the group of desirable candidates to
approximately one dozen candidates, with seven candidates expressing interest.
Candidates returning confidentiality agreements were sent confidential material
on BKLA on February 18, 1998. Discussions concerning a potential transaction
were held with candidates expressing interest in February 1998; however, other
than the discussions held with representatives of Western, such discussions were
not fruitful.
    
 
   
    In February 1998, Scott Burford of GBS Financial, contacted Matthew P.
Wagner, President and Chief Executive Officer of Western, to explore a possible
acquisition. On March 4, 1998, a non-binding indication of interest to acquire
BKLA was received from Belle Plaine Partners, Inc., financial advisor to
Western. Several discussions were conducted between Scott Burford, Matthew P.
Wagner and John M. Eggemeyer III, director of Western and principal of Belle
Plaine Partners, Inc. A meeting was arranged on March 31, 1998 to negotiate the
major terms of the acquisition. The meeting was attended by Scott Burford,
Maurice J. Burford, the Chairman of the Board of BKLA at the time, Adriana M.
Boeka, the Vice Chairman of the Board of BKLA at the time, John M. Eggemeyer
III, Matthew P. Wagner, Arnold C. Hahn, Chief Financial Officer of Western and
Julius G. Christensen, General Counsel of Western. The principal terms of the
transaction were agreed upon.
    
 
   
    The BKLA Board and Management considered certain factors before accepting
the Western offer, independently, including: (i) the feasibility of remaining
independent in the short term and seeking to merge with Western or another
banking organization in the future; (ii) the ability to merge BKLA with a
similar sized bank or with a banking institution other than Western; (iii)
continuing to operate as an independent entity indefinitely; (iv) the strategy,
business, operations, earnings, and financial condition of Western on both a
historical and prospective basis; (iv) the historical stock price performance of
Western Common Stock; (vi) the high price of Western Common Stock relative to
its tangible book value; (vii) the liquidity and marketability of Western Common
Shares; (viii) the ability of Western's Management to integrate its recent
acquisitions; (ix) Western's rapid expansion; (x) due diligence investigations
conducted by BKLA Management and its advisors; (xi) the general impact the
Merger would have on various constituencies served by BKLA, including its
employees; (xii) Western's favorable ratings under the Community Reinvestment
Act; and (xiii) the terms of the Merger Agreement.
    
 
   
    In reaching its determination to approve and recommend the Merger, the BKLA
Board did not assign any relative or specific weights to the various factors
considered by it. Individual directors may have given different weights to
different factors and such other things as assessments of Western's credit
policies, asset quality, adequacy of loan loss reserves and interest rate risk.
    
 
   
    On April 9, 1998, BKLA hired Wedbush to provide an opinion as to the
fairness of the Conversion Number. The BKLA Board held a special meeting on
April 16, 1998, at which the proposed merger was considered in detail and the
opinion provided by Wedbush and the Merger Agreement was presented. At that
meeting, the BKLA Board unanimously approved the Merger Agreement and the
various matters and
    
 
                                       71
<PAGE>
   
related agreements contemplated thereby. Maurice J. Burford did not attend the
meeting, but assented in absence. Due diligence was performed by BKLA and the
Merger Agreement was executed.
    
 
   
    The Western Board held a meeting on April 7, 1998, at which the proposed
Merger was considered in detail with Western's Management, including the
consideration to be paid by Western and the related transactions. At that
meeting, the Western Board approved the Merger Agreement and the various matters
and related agreements contemplated thereby and authorized Western Management to
take all action reasonably necessary to effect the Merger. The Merger Agreement
as approved contained a "due diligence out" provision pursuant to which Western
could, in its sole discretion, upon completion of its due diligence review of
BKLA, terminate the Merger at any time prior to 5:00 p.m. on April 29, 1998. On
April 29, 1998, Western completed its due diligence and determined not to
terminate the Merger Agreement.
    
 
    On April 16, 1998, the SMB Board held a special meeting and approved the
Merger after reviewing the terms of the Merger in detail. On April 17, 1998,
Western and BKLA publicly announced the Merger.
 
   
    The managements of Western and BKLA believe that the two institutions
complement each other in their community-based approaches to banking and in
terms of their markets, both geographic and demographic. Consequently both
managements perceive opportunities for increased operating efficiencies through
combination and believe that, by combining forces, they will be able to compete
more efficiently and successfully to take advantage of banking opportunities in
the rapidly evolving Los Angeles and Southern California markets. See "RISK
FACTORS--Ability to Integrate the Operations of Western and BKLA; Rapid Growth".
    
 
STRUCTURE OF THE MERGER
 
    The Merger Agreement provides for the merger of BKLA with and into Santa
Monica Bank, with Santa Monica Bank being the Surviving Corporation, operating
under that name. As more fully described below in "THE MERGER AGREEMENT" in
connection with the Merger, each share of BKLA Common Stock issued and
outstanding at the Effective Time (other than (a) shares that have not been
voted in favor of approval of the principal terms of the Merger and with respect
to which Dissenters' Rights have been perfected in accordance with the CGCL and
(b) shares held directly or indirectly by Western, other than shares held in a
fiduciary capacity or in satisfaction of a debt previously contracted in good
faith) will be converted automatically into, subject to the limitations set
forth in the Merger Agreement with respect to proration and fractional shares,
the Consideration. Each share of Western Common Stock outstanding immediately
prior to the Effective Time will remain outstanding after the Merger as one
share of Western Common Stock. See "THE MERGER AGREEMENT--The Merger".
 
    At the Effective Time, all BKLA Stock Options, unless otherwise exercised
pursuant to BKLA's Stock Option Plan, shall be converted into the right to
receive for each share of BKLA Common Stock otherwise issuable upon exercise
thereof a number of shares of Western Common Stock equal to the quotient
obtained by dividing the Spread by $42.61. At the Effective Time, each BKLA
Warrant shall be converted into a warrant to acquire, on the same terms and
conditions as were applicable under such BKLA warrant agreement, the number of
shares of Western Common Stock equal to (a) the number of shares of BKLA Common
Stock subject to the BKLA Warrant, multiplied by (b) the Conversion Number (such
product rounded down to the nearest whole number), at an exercise price per
share (rounded up to the nearest whole cent) equal to (y) the aggregate exercise
price for the shares of BKLA Common Stock which were purchasable pursuant to
such BKLA Warrant divided by (z) the number of full shares of Western Common
Stock subject to such Replacement Warrant.
 
   
    See "NOTES TO UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL DATA--NOTE
1".
    
 
                                       72
<PAGE>
REASONS FOR THE MERGER; RECOMMENDATIONS OF THE BKLA BOARD OF DIRECTORS
 
    The BKLA Board has unanimously approved the Merger and the Merger Agreement
and unanimously recommends that BKLA Shareholders vote "FOR" the approval of the
principal terms of the Merger. In reaching its determination to approve the
Merger, the BKLA Board analyzed BKLA's alternatives for enhancement of BKLA
Shareholder value, including BKLA's prospects under several assumptions so as to
be able to compare the value of a share of BKLA Common Stock with the
Consideration as well as with comparable transactions. At the same time, the
BKLA Board also reviewed the history of Western and the prospects of Western if
the Merger were consummated. The factors that were examined as part of this
analysis, include, but were not limited to the following:
 
    (a) Data showing BKLA's results of operations and financial condition;
 
    (b) The increasing competition in BKLA's markets from both existing and
    potential competitors, some of whom have far greater assets and resources,
    in part as a result of the consolidation taking place in the banking
    industry;
 
    (c) The efficacy of BKLA's strategic plan under current competitive
    conditions and actions which would increase financial performance and
    shareholder value over the period of its projection;
 
    (d) The consolidation of the banking industry nationally and in California;
 
    (e) A review of potential benefits for shareholders of a larger organization
    with greater resources, increased operating efficiencies, the ability to
    utilize trust department capacity over a larger base, an increased lending
    limit and a stronger market position in western Los Angeles County;
 
    (f) The belief of the BKLA Board and Management that a business combination
    with Western would offer increased long-term value and liquidity to current
    BKLA Shareholders;
 
    (g) A comparison of the Western offer with reported transactions, nationally
    and in California, by financial institutions with similar characteristics;
    and
 
    (h) The opinion of Wedbush that, as of April 15, 1998, and based upon, and
    subject to, the matters stated in that opinion, the Conversion Number was
    fair, from a financial point of view, to the BKLA Shareholders.
 
    The foregoing discussion of material factors considered by the BKLA Board is
not intended to be exhaustive but does set forth the principal factors
considered by the BKLA Board. The BKLA Board collectively reached the unanimous
conclusion to approve the Merger in light not only of the factors described
above but of such other factors as each Board member felt were appropriate. The
BKLA Board did not assign relative or specific weights to any of the factors
described above and individual directors may have weighed such factors
differently.
 
    FOR THE REASONS SET FORTH ABOVE THE BKLA BOARD HAS UNANIMOUSLY APPROVED THE
MERGER AS IN THE BEST INTERESTS OF BKLA AND ITS SHAREHOLDERS AND UNANIMOUSLY
RECOMMENDS THAT BKLA SHAREHOLDERS APPROVE THE PRINCIPAL TERMS OF THE MERGER.
 
OPINION OF WEDBUSH
 
   
    Pursuant to a letter agreement dated April 9, 1998 (the "Wedbush
Agreement"), Wedbush was retained by the Board of Directors of BKLA to render an
opinion as to whether the Conversion Number in the Merger is fair, from a
financial point of view, to the BKLA Shareholders.
    
 
   
    Representatives of Wedbush attended the special meeting of the BKLA Board
held on April 16, 1998 at which time the BKLA Board considered and approved the
Merger Agreement. At that meeting, Wedbush rendered its opinion dated April 15,
1998 that, as of such date, the Conversion Number was fair to the holders of
shares of BKLA Common Stock from a financial point of view (the "Wedbush
Opinion"). Such opinion was reconfirmed in writing as of the date of this Proxy
Statement-Prospectus (the "Wedbush Reconfirming Opinion"). No limitations were
imposed by BKLA's Board on Wedbush with respect to the investigations made or
procedures followed in rendering its opinion.
    
 
                                       73
<PAGE>
    THE FULL TEXT OF THE WEDBUSH RECONFIRMING OPINION, WHICH SETS FORTH THE
PROCEDURES FOLLOWED, ASSUMPTIONS MADE, MATTERS CONSIDERED AND QUALIFICATIONS AND
LIMITATIONS ON THE REVIEW UNDERTAKEN, IS ATTACHED HERETO AS APPENDIX B TO THIS
PROXY STATEMENT-PROSPECTUS AND IS INCORPORATED HEREIN BY REFERENCE WITH THE
CONSENT OF WEDBUSH. THE SUMMARY OF THE WEDBUSH OPINION SET FORTH IN THIS PROXY
STATEMENT-PROSPECTUS IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE FULL TEXT
OF SUCH OPINION. HOLDERS OF BKLA'S COMMON STOCK ARE URGED TO READ THE WEDBUSH
RECONFIRMING OPINION IN ITS ENTIRETY IN CONNECTION WITH THEIR CONSIDERATION OF
THE PROPOSED MERGER. THE WEDBUSH OPINION AND THE WEDBUSH RECONFIRMING OPINION
ARE ADDRESSED TO THE BKLA BOARD OF DIRECTORS ONLY AND DO NOT CONSTITUTE A
RECOMMENDATION TO ANY SHAREHOLDER AS TO HOW THAT SHAREHOLDER SHOULD VOTE AT THE
SPECIAL MEETING.
 
   
    The following discussion summarizes the material features of the Wedbush
Opinion, Wedbush's qualifications and BKLA's engagement of Wedbush. Prior to
this engagement, Wedbush had not performed any material services for BKLA, and
no additional services are contemplated at this time. The Conversion Number in
the Merger Agreement was negotiated by BKLA prior to Wedbush's engagement.
    
 
    For purposes of its opinion, Wedbush reviewed and analyzed, among other
things: (1) a draft of the Merger Agreement and the specific terms of the
Merger, (2) certain publicly available business and financial information
relating to BKLA and Western that Wedbush deemed to be relevant, (3) certain
internal information, primarily financial in nature, including financial
projections and other financial and operating data relating to strategic
implications and operational benefits anticipated to result from the Merger,
furnished to Wedbush by BKLA and Western, (4) certain publicly available and
other information concerning the trading of, and the trading market for, BKLA
and Western Common Stock, (5) certain publicly available information with
respect to other companies that Wedbush believed to be comparable in certain
respects to BKLA or Western, and (6) certain publicly available information with
respect to other merger and acquisition transactions that Wedbush believed to be
comparable in certain respects to the Merger. In addition, Wedbush held
discussions with the managements of BKLA and Western concerning their views as
to the financial and other information described above and the potential cost
savings, operating synergies, revenue enhancements and strategic benefits
expected to result from the Merger. In addition to the foregoing, Wedbush
conducted such other analyses and examinations and considered such other
financial, economic and market criteria as it deemed appropriate to arrive at
its opinion.
 
    In arriving at its opinion, Wedbush assumed and relied upon the accuracy and
completeness of all financial and other information provided to or reviewed by
it or publicly available, and Wedbush has not assumed any responsibility for
independent verification of any such information. With respect to financial
projections and other information provided to or reviewed by Wedbush, it has
been advised by the managements of BKLA and Western that such projections and
other information were reasonably prepared on bases reflecting the best
currently available estimates and judgments of the respective managements of
BKLA and Western as to the expected future financial performance of BKLA and
Western and the strategic implications and operational benefits anticipated from
the Merger, and Wedbush assumed that, after the Merger, Western and its
subsidiaries will perform substantially in accordance with such projections.
Wedbush further relied on the assurances of managements of BKLA and Western that
they are unaware of any facts that would make the information or projections
provided to Wedbush incomplete or misleading. In particular, Wedbush relied upon
a schedule provided by Western of estimated synergies and related cost savings
that BKLA expects to achieve as a result of the Merger. With respect to pending
legal and regulatory proceedings involving BKLA or Western, Wedbush was not in a
position to evaluate the impact of such proceedings and it assumed that these
matters would be resolved in a manner that would not adversely affect in any
material respect the financial projections on which Wedbush relied for purposes
of its opinion. Wedbush did not make or receive any independent evaluations
 
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or appraisals of any of BKLA's or Western's assets, properties, liabilities or
securities, nor did Wedbush make any physical inspection of the properties or
assets of BKLA or Western. Wedbush assumed that Western will account for the
Merger as a pooling of interests in accordance with generally accepted
accounting principles ("GAAP"), and that the Merger qualifies for such
accounting treatment under GAAP. Wedbush also assumed that the Merger will
constitute a "reorganization" within the meaning of Section 368(a) of the
Internal Revenue Code of 1986, as amended, and neither BKLA, Western, Santa
Monica Bank nor holders of BKLA Shares will recognize gain or loss for U.S.
federal and state income tax purposes as a result of the Merger. Wedbush also
assumed that all conditions to the Agreement will be satisfied and not waived.
 
    Wedbush is not an expert in the evaluation of loan losses or reserves or
allowances therefor, and it did not make an independent evaluation of the
adequacy of the reserve or allowance for loan losses of BKLA or Western, nor did
it review any individual credit files relating to BKLA or Western. Rather,
Wedbush assumed that the aggregate reserve or allowance for loan losses for each
of BKLA and Western was adequate to cover such losses and will be adequate after
the Merger for Western and its subsidiaries.
 
    The Wedbush Opinion relates to the relative values of BKLA and Western and
does not imply any conclusion as to what the values of the Western Shares
actually will be when issued pursuant to the Merger or the price at which such
stock will trade following the consummation of the Merger. The Wedbush Opinion
necessarily is based upon conditions and circumstances as they exist and can be
evaluated as of the date of such opinion and does not address the underlying
business decision of BKLA to enter into the Agreement or complete the Merger.
Specifically, Wedbush was not asked to nor did it express an opinion as to the
relative merits of the Merger as compared to any alternative business strategies
that might exist for BKLA or the effect of any other transaction in which BKLA
might engage.
 
    The Wedbush Opinion was based on economic, market and other conditions as in
effect on, and the information made available to Wedbush as of, the date of such
opinion. Events occurring after that date could materially affect the
assumptions used in preparing the opinion.
 
   
    Wedbush was selected to render its opinion as to the fairness of the
Conversion Number from a financial point of view based upon its qualifications,
expertise and reputation. Wedbush is an investment banking firm and a member of
the New York Stock Exchange and other principal stock exchanges in the United
States, and is regularly engaged as part of its business in the valuation of
businesses and their securities in connection with mergers and acquisitions,
negotiated underwriting private placements, secondary distributions of listed
and unlisted securities, and valuations for corporate, estate and other
purposes.
    
 
  SUMMARY OF ANALYSES OF WEDBUSH
 
    While the following summaries describe the principal elements of the
analyses and examinations that Wedbush performed in arriving at the Wedbush
Opinion, they are not a comprehensive description of all analyses and
examinations actually conducted by Wedbush. The preparation of a fairness
opinion involves various determinations of the most appropriate and relevant
methods of financial analysis and the application of those methods to the
particular circumstances, and, therefore, such an opinion is not susceptible to
partial analysis or summary description. Each of the analyses conducted by
Wedbush was carried out in order to provide a different perspective on the
transaction and to add to the total mix of information available. Wedbush did
not form a conclusion as to whether any individual analysis, considered alone,
supported or failed to support an opinion as to fairness from a financial point
of view. Rather, in reaching its conclusion, Wedbush considered the results of
the analyses as a whole and did not place particular reliance or weight on any
individual factor. Therefore, selecting portions of the analyses and the factors
considered, without considering all such analyses and factors, would create an
incomplete or misleading view of the evaluation process underlying the Wedbush
Opinion. The range of valuations
 
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<PAGE>
resulting from any particular analysis described herein should not be taken to
be Wedbush's view of the actual value or predicted future value of BKLA or
Western Common Stock.
 
    In performing its analyses, Wedbush made numerous assumptions with respect
to industry performance and general business and economic conditions such as
industry growth, inflation, interest rates and various other matters, many of
which are beyond the control of BKLA, Western, and Wedbush. Any estimates
contained in Wedbush's analyses are not necessarily indicative of actual values
or future results, which may be significantly more or less favorable than
indicated by such analyses. See "RISK FACTORS". Such analyses were prepared
solely as part of Wedbush's analysis of the fairness of the Conversion Number to
BKLA Shareholders. Additionally, estimates of the values of the business and
securities do not purport to be appraisals of the assets or market values of
BKLA or Western, or their respective securities, nor do they necessarily reflect
the prices at which such businesses or securities may actually be sold.
 
    The following is a summary of the material financial analyses performed by
Wedbush in connection with the Wedbush Opinion.
 
  SUMMARY OF THE PROPOSED TRANSACTION
 
    Wedbush reviewed the terms of the Merger, including the Conversion Number
and the implied aggregate and per share transaction value. Based on a price of
$47.13 per share of Western Common Stock on April 15, 1998, Wedbush calculated
an implied aggregate transaction value of approximately $115.0 million assuming:
(i) exercise of all stock options and warrants; (ii) no Dissenters Rights are
perfected by BKLA Shareholders; (iii) no cash is paid in lieu of fractional
shares; and (iv) an implied transaction value per share of BKLA Common Stock of
approximately $19.91. Wedbush noted that the implied transaction per share value
represented multiples of (1) 19.5x BKLA's twelve months' ending March 31, 1998
diluted earnings per share ("Diluted EPS"), (2) 3.11x BKLA's diluted book value
per share at March 31, 1998, and (3) 3.69x BKLA's diluted tangible book value
per share at March 31, 1998, as well as a premium of 26% over BKLA's closing
stock price of $15.75 on April 9, 1998 (five trading days prior to public
announcement of the Merger).
 
  ANALYSIS OF SELECTED BANK MERGER TRANSACTIONS
 
    Wedbush reviewed certain publicly available information regarding selected
merger and acquisition transactions: (1) involving banks and bank holding
companies located in California, (2) with assets of between $100 million and
$600 million, and (3) announced between September 1, 1996 and April 15, 1998.
The selection of the comparable transactions involves complex considerations and
judgments concerning similarities and differences in financial, operational and
other characteristics that could affect the acquisition value of potentially
comparable banks. None of the acquired banks utilized in the selected merger and
acquisition comparable valuation were identical to BKLA and none of the
transactions were identical to the Merger.
 
   
    The transactions deemed appropriate for comparison (the "Comparison Merger
Transactions") involved the following sets of institutions (identified by
acquiror/acquired bank): Bank of Commerce/ Rancho Vista National Bank; Mid-State
Bank/BSM Bancorp; Pacific Bank, NA/Sterling West Banc; Zions Bancorp/FP Bancorp,
Inc.; SierraWest Bancorp/CA Community Bancshares; Urban Bank/Redwood Bancorp;
Greater Bay Bancorp/Peninsula Bank; City National Corporation/Harbor Bancorp;
Western/ SCB; US Bancorp/Business & Professional Bank; Dartmouth
Capital/Eldorado Bancorp; Western/CCB; Santa Barbara Bancorp/First Valley Bank;
Golden State Bancorp/Transworld Bancorp; City National Corporation/Riverside
National Bank; Bank SinoPac/Far East National Bank; and City National
Corporation/Ventura County National Bancorp.
    
 
    For each of the Comparison Merger Transactions, Wedbush analyzed the
transaction's value as a multiple of the acquired bank's (1) prior twelve months
publicly reported basic earnings per share ("LTM Multiple"), (2) publicly
reported book value at the end of the last accounting period prior to the
 
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acquisition ("Book Value Multiple"), and (3) publicly reported tangible book
value at the end of the last accounting period prior to the acquisition
("Tangible Book Value Multiple"). Additionally, Wedbush analyzed the
"Acquisition Premium" paid in each transaction, defined as the amount by which
the acquisition price per share surpassed the price per share of the acquired
bank's common stock five days before the acquisition was publicly announced.
 
    This analysis indicated a range of transaction values for the Comparison
Merger Transactions representing LTM Multiples of 6.8x to 28.2x (with a median
of 17.5x) compared to 19.5x for BKLA at the Conversion Number; Book Value
Multiples of 1.16x to 4.08x (with a median of 1.93x) compared to 3.11x for BKLA
at the Conversion Number; Tangible Book Value Multiples of 1.16x to 4.08x (with
a median of 1.98x) compared to 3.69x for BKLA at the Conversion Number; and
Acquisition Premiums of 3% to 91% (with a median of 20%) compared to 26% for
BKLA at the Conversion Number.
 
    Wedbush then calculated an implied transaction per share equity reference
range for BKLA by applying the median of the range of multiples derived from the
Comparison Merger Transactions to corresponding financial data for BKLA, which
indicated an implied transaction equity value reference range of between $10.66
and $18.93 per share of BKLA.
 
  DISCOUNTED CASH FLOW ANALYSIS
 
    Using a discounted cash flow analysis, Wedbush estimated the present value
of the future streams of after-tax cash flow that BKLA could produce on a
stand-alone basis from 1998 through 2002 and distribute to BKLA's shareholders
("Dividendable Net Income"). Wedbush projected after-tax distributions such that
BKLA's ratio of tangible common equity to tangible assets would be maintained at
a 6.0% level. Wedbush estimated the residual value of BKLA at the end of 2002 to
be in the range of 13x to 17x projected 2002 net income plus goodwill
amortization ("Cash Net Income"). The projected Dividendable Net Income streams
and residual values were then discounted to present value at rates ranging from
12% to 16%. Wedbush then aggregated (1) the present value of the Dividendable
Net Income flows and (2) the present value of the residual values to derive an
implied transaction equity value reference range of $9.60 to $13.00 per share of
BKLA. Wedbush also performed a discounted cash flow analysis assuming the
realization of certain cost savings and revenue enhancements expected to result
from the Merger. This analysis indicated an implied equity value reference range
of $13.20 to $18.60 per share of BKLA.
 
    In determining the discount rates used in the discounted cash flow analysis
of BKLA, Wedbush noted, among other things, factors such as inflation,
prevailing market interest rates, the business risk inherent to Western, the
required rates of return of holders or prospective buyers of BKLA Common Stock,
and the cost of capital for banks similar to BKLA. In determining the range of
residual value multiples used in deriving the residual value of BKLA, Wedbush
noted, among other things, the multiples at which BKLA Common Stock historically
traded, the multiples at which public banks Wedbush deemed appropriate for
comparison to BKLA historically traded, and the multiples observed in historical
business combination transactions which Wedbush deemed relevant.
 
  COMPARABLE BANK ANALYSIS
 
    Using publicly available information, Wedbush compared certain financial,
operating and stock market data of BKLA with similar data of selected publicly
traded companies in the banking industry of a size considered by Wedbush to be
appropriate for comparison to BKLA, after applying an equity control premium of
20% (based on the median premium paid in the Comparison Merger Transactions).
Although such banks were considered similar to BKLA, none of them has the same
management, assets, deposit base, size or franchise as BKLA.
 
    Wedbush considered the following banks appropriate for comparison (the
"Comparable Banks") to BKLA: Bank of Hemet, Bank of Santa Clara, Borel Bank &
Trust Company, BYL Bancorp, California Independent Bancorp, Coast Bancorp,
Desert Community Bank, First Regional Bancorp, North County
 
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<PAGE>
Bancorp, North Valley Bancorp, Orange National Bancorp, Professional Bancorp,
Inc., and Six Rivers National Bank.
 
    All multiples were based on closing share prices as of April 13, 1998. This
analysis indicated a range of share prices for the Comparable Banks (after
applying the equity control premium of 20%) representing multiples of such
companies' (1) latest twelve months basic earnings per share of 14.24x to 43.48x
(with a median of 20.87x); (2) latest publicly reported book value of 1.56x to
3.89x (with a median of 2.44x); and (3) latest publicly reported tangible book
value of 1.59x to 3.89x (with a median of 2.49x). Wedbush then calculated an
implied transaction equity value reference range for BKLA by applying the median
of these multiples to corresponding data for BKLA, which indicated an implied
per share value reference range of $15.70 to $20.87.
 
  CONTRIBUTION ANALYSIS
 
    Wedbush analyzed the respective contributions of BKLA and Western to the
combined company's pro forma balance sheet as of March 31, 1998 and pro forma
historic net income for the latest twelve months ended March 31, 1998 without
giving effect to certain cost savings and revenue enhancements expected to
result from the Merger. The financial and operating information reviewed
included, among other things, total assets, deposits, net loans, common equity,
tangible equity, at March 31, 1998; pro forma net income and pro forma Cash Net
Income for the twelve months ended March 31, 1998. This analysis showed that
BKLA would have contributed approximately 11.8% of total assets, 10.5% of net
loans, 11.8% of deposits, 10.1% of common equity, 16.1% of tangible equity,
43.7% of pro forma net income, 20.9% of pro forma Cash Net Income, for the
twelve months ended March 31, 1998. By contrast, BKLA Shareholders would own
approximately 13% of the diluted shares of the combined company upon
consummation of the Merger based upon the Conversion Number.
 
  PRO FORMA MERGER ANALYSIS
 
    Based on projections and various other assumptions provided by BKLA and
Western, including estimated cost savings and revenue enhancements expected to
result from the Merger, Wedbush analyzed the pro forma per share impact of the
Merger on a variety of projected financial measures including, among others,
BKLA's Diluted EPS, book value per share and tangible book value per share
during the calendar years 1999 through 2000 relative to BKLA on a stand-alone
basis.
 
   
    The analysis indicated that on a per share basis, the proposed Merger could
be accretive to BKLA's Diluted EPS and book value, while dilutive to its
tangible book value, in each of the years analyzed assuming certain cost savings
and revenue enhancements anticipated by Western Management to result from the
Merger are achieved. Wedbush also analyzed the potential pro forma effect of the
Merger on Western's Diluted EPS during the calendar years 1999 and 2000 relative
to Western on a stand-alone basis. This analysis indicated that the Merger could
be accretive to Western's Diluted EPS in each year, assuming certain cost
savings and revenue enhancements anticipated by the Western Management to result
from the Merger are achieved.
    
 
   
    Wedbush also performed a pro forma sensitivity analysis by varying many of
the underlying assumptions of the analysis including, among others, the cost
savings, revenue enhancement, and growth estimates of BKLA, Western and SMB as
part of the analysis of the estimated pro forma effect of the Merger.
    
 
  HISTORICAL TRADING AND CONVERSION NUMBER ANALYSIS
 
    Wedbush analyzed the ratios of closing stock prices per share of Western
Common Stock to BKLA Common Stock as reported on the Nasdaq during various time
periods. Wedbush observed that from June 4, 1997 through April 14, 1998, the
average ratio of closing stock prices of BKLA and Western was 0.3560x, with a
high of 0.4710x and a low of 0.2458x. For the 30 trading day period of March 3,
1998
 
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through April 14, 1998, the average ratio of closing stock prices of BKLA and
Western was 0.3438x, with a high of 0.3702x and a low of 0.3223x.
 
    Wedbush reviewed the comparative performance of Western and BKLA Common
Stock relative to the S&P 500 index, the Nasdaq Banking index, and the S&P Bank
Index. This analysis indicated that both companies outperformed the indexes over
the period of June 4, 1997 through April 14, 1998.
 
WEDBUSH FEE
 
    Pursuant to the terms of the Wedbush Agreement, BKLA has paid Wedbush a fee
of $75,000, half of which was payable upon execution of the Wedbush Agreement
and the other half of which became payable at the time Wedbush notified BKLA
that it was prepared to deliver to the Board of BKLA its opinion as to the
fairness of the Conversion Number without disclosing the conclusion reached
therein. BKLA considered this fee reasonable after soliciting and receiving bids
from other qualified firms for $150,000 to $250,000. BKLA has also agreed to
reimburse Wedbush for its reasonable out-of-pocket expenses incurred in
connection with its engagement and to indemnify Wedbush and its employees,
agents, officers, attorneys and shareholders and any person who controls or is
deemed to control Wedbush against certain liabilities, including liabilities
under the federal securities laws.
 
    In the ordinary course of business, Wedbush and its affiliates may actively
trade the equity securities of BKLA and of Western for their own account and for
accounts of customers and, accordingly, may at any time hold a long or short
position in such securities.
 
CERTAIN FEDERAL INCOME TAX CONSEQUENCES
 
    THE FEDERAL INCOME TAX DISCUSSION SET FORTH BELOW MAY NOT BE APPLICABLE TO
CERTAIN CLASSES OF TAXPAYERS, INCLUDING SECURITIES DEALERS AND OTHERS THAT USE A
"MARKET-TO-MARKET" METHOD OF ACCOUNTING FOR FEDERAL INCOME TAX PURPOSES, TAX
EXEMPT ORGANIZATIONS OR TRUSTS, FOREIGN PERSONS, PERSONS WHO HOLD SHARES OF BKLA
COMMON STOCK AS PART OF A STRADDLE OR CONVERSION TRANSACTION AND PERSONS WHO
ACQUIRED SHARES OF BKLA COMMON STOCK PURSUANT TO THE EXERCISE OF EMPLOYEE STOCK
OPTIONS OR RIGHTS OR OTHERWISE AS COMPENSATION. BKLA SHAREHOLDERS ARE URGED TO
CONSULT THEIR OWN TAX ADVISORS AS TO THE SPECIFIC TAX CONSEQUENCES TO THEM OF
THE MERGER, INCLUDING THE APPLICABILITY AND EFFECT OF FEDERAL, STATE, LOCAL AND
OTHER TAX LAWS.
 
  TAX OPINIONS
 
   
    It is intended that the Merger will be treated as a reorganization within
the meaning of Section 368(a) of the Code. Consummation of the Merger as a
reorganization is conditioned upon receipt by Western of confirmation,
immediately prior to the Effective Time, of the opinion of Sullivan & Cromwell,
and receipt by BKLA of confirmation, immediately prior to the Effective Time, of
the opinion of Vavrinek, which opinions will be dated as of the Effective Date,
substantially to the effect that, for federal income tax purposes: (i) the
Merger will be treated as a reorganization within the meaning of Section 368(a)
of the Code, and (ii) each of Western, Santa Monica Bank and BKLA will be a
party to that reorganization within the meaning of Section 368(b) of the Code.
    
 
   
    The Tax Opinions will not be binding on the Internal Revenue Service (the
"IRS"), and there can be no assurance that the IRS will not contest the
conclusions expressed therein. The Tax Opinions will be based in part upon
certain factual assumptions and upon certain representations made, and
certificates delivered, by Western, Santa Monica Bank and BKLA, which
representations and certificates Sullivan & Cromwell and Vavrinek will assume to
be true, correct and complete. If such representations or certificates are
inaccurate, the Tax Opinions could be adversely affected.
    
 
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<PAGE>
  TAX CONSEQUENCES OF THE MERGER
 
    GENERAL.  The following summary sets forth certain anticipated material
federal income tax consequences of the Merger to BKLA Shareholders. The tax
treatment of each BKLA Shareholder will depend in part upon such shareholder's
particular situation. This summary is based on the provisions of the Code, the
Treasury Regulations promulgated thereunder and administrative and judicial
interpretations thereof, all as in effect as of the date hereof. Such laws,
regulations or interpretations may differ at the Effective Time, and relevant
facts also may differ.
 
    No gain or loss will be recognized by a BKLA Shareholder who receives solely
Western Common Stock for such BKLA Shareholder's shares of BKLA Common Stock
(except to the extent such shareholder receives cash in lieu of a fractional
share interest in Western Common Stock).
 
    Such a BKLA Shareholder's aggregate tax basis in the Western Common Stock
received pursuant to the Merger will equal such shareholder's aggregate tax
basis in the shares of BKLA Common Stock exchanged therefor, reduced by any
amount allocable to a fractional share interest of Western Common Stock for
which cash is received. The holding period of Western Common Stock received
pursuant to the Merger (the "Holding Period" as described in the paragraph
below), will include the holding period of the shares of BKLA Common Stock
exchanged therefor, provided that such shares were held as a capital asset as of
the Effective Date.
 
   
    FRACTIONAL SHARES OF WESTERN COMMON STOCK.  No fractional shares of Western
Common Stock will be issued in the Merger. A BKLA Shareholder who receives cash
in lieu of such a fractional share will be treated as having received such
fractional share pursuant to the Merger and then as having exchanged such
fractional share for cash in a redemption by Western subject to Section 302 of
the Code. Such a deemed redemption will be treated as a sale of the fractional
share, provided that it is not "essentially equivalent to a dividend". If the
Western Common Stock represents a capital asset in the hands of the shareholder,
the shareholder will generally recognize capital gain or loss on such a deemed
redemption of the fractional share in an amount determined by the difference
between the amount of cash received therefor and the shareholder's tax basis in
the fractional share. The Holding Period of any such capital gain or loss will
be long-term if the BKLA Common Stock exchanged was held for more than one year.
Effective as of January 1, 1998, long-term capital gain of a non-corporate
shareholder is generally subject to a maximum capital gains rate of 20% for
capital assets held for more than one year.
    
 
  BACKUP WITHHOLDING
 
   
    Unless an exemption applies under applicable law and regulations, the
Exchange Agent (as defined herein), will be required to withhold 31% of any cash
payments to which a non-corporate shareholder or payee is entitled pursuant to
the Merger unless the shareholder or other payee provides its taxpayer
identification number (social security number, employer identification number or
individual taxpayer identification number) and certifies that such number is
correct. Each shareholder and, if applicable, each other payee must provide the
information and certification necessary to avoid backup withholding, unless an
applicable exemption exists and is established in a manner satisfactory to
Western and the Exchange Agent.
    
 
REGULATORY APPROVALS
 
  GENERAL
 
    The Merger cannot proceed in the absence of the regulatory approvals.
Western and BKLA are not aware of any material governmental approvals or actions
that are required for consummation of the Merger, except as described below.
Western and BKLA have agreed in the Merger Agreement to use reasonable best
efforts promptly to take all actions necessary, proper or advisable to
consummate the transactions contemplated by the Merger Agreement, including
using efforts to obtain all necessary
 
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<PAGE>
approvals from all applicable governmental entities, making all necessary
registrations, applications and filings and obtaining any contractual consents
and regulatory approvals. However, there can be no assurance that such
regulatory approvals will be obtained, nor can there be assurance as to the date
of any such approval. There can also be no assurance that any such approval will
not contain a condition or requirement that causes such approvals to fail to
satisfy the conditions set forth in the Merger Agreement and described below
under "THE MERGER AGREEMENT--Conditions".
 
  FEDERAL DEPOSIT INSURANCE CORPORATION AND FEDERAL RESERVE BOARD APPROVALS
 
    Consummation of the Merger is subject to receipt of the prior approval of
the FDIC under the Bank Merger Act, 12 U.S.C. Section 1828(c) (the "BMA"). The
BMA requires that the FDIC take into consideration, among other factors, the
financial and managerial resources and future prospects of the institutions and
the convenience and needs of the communities to be served. The BMA prohibits the
FDIC from approving the Merger (i) if such transaction would result in a
monopoly or be in furtherance of any combination or conspiracy to monopolize or
to attempt to monopolize the business of banking in any part of the United
States, or (ii) if the effect of such transaction in any section of the country
may be substantially to lessen competition or to tend to create a monopoly, or
if it would in any other manner be a restraint of trade, unless the relevant
regulatory agency finds that the anti-competitive effects of such merger are
clearly outweighed by the public interest and by the probable effect of the
transaction in meeting the convenience and needs of the communities to be
served.
 
    The Merger is also subject to prior approval by the Federal Reserve Board
under Section 3 of the BHCA or a waiver of such requirement in accordance with
regulations adopted by the Federal Reserve Board under the BHCA. If an
application is required under the BHCA, the Federal Reserve Board will take into
consideration, among other things, competition, the financial and managerial
resources and future prospects of the holding companies and banks concerned and
the convenience and needs of the communities to be served. The BHCA prohibits
the Federal Reserve Board from approving the Merger if (a) it would result in a
monopoly or would be in furtherance of any combination or conspiracy to
monopolize or attempt to monopolize the business of banking in any part of the
United States or (b) its effect in any section of the country may be
substantially to lessen competition or tend to create a monopoly, or it would in
any other manner be in restraint of trade, unless the Federal Reserve Board
finds that the anti-competitive effects of the Merger are clearly outweighed in
the public interest by the probable effect of the transaction in meeting the
convenience and needs of the communities to be served.
 
   
    Each of the FDIC and the Federal Reserve Board has the authority to deny an
application if it concludes that the combined organization would have an
inadequate capital structure, taking into account, among other factors, the
nature of the business and operations and plans for expansion. Furthermore, the
FDIC and the Federal Reserve Board must also assess the records of the
depository institution subsidiaries of Western and BKLA under the Community
Reinvestment Act of 1977, as amended (the "CRA"). The CRA requires that the FDIC
and the Federal Reserve Board assess, when evaluating an application, each
depository institution's record of meeting the credit needs of its local
communities, including low- and moderate-income neighborhoods, consistent with
safe and sound operation and take such record into account when evaluating
certain regulatory applications. Each of Santa Monica Bank, SCB and BKLA has a
CRA rating of "satisfactory".
    
 
   
    Under the BMA and the BHCA, the Merger may not be consummated until the
thirtieth day following FDIC or Federal Reserve Board approval, as the case may
be. If the FDIC and the Federal Reserve Board have not received any adverse
comments from the Department of Justice relating to competitive factors, the
waiting period may be reduced to no less than 15 days. If the United States
Department of Justice commenced an action challenging the Merger on antitrust
grounds during such waiting period, commencement of such action would stay the
effectiveness of the FDIC and Federal Reserve Board approvals, unless a court
specifically orders otherwise.
    
 
                                       81
<PAGE>
   
    Western and BKLA submitted an application seeking approval of the Merger and
related matters to the FDIC on or about June 30, 1998. The application was
deemed informationally complete by the FDIC on July 13, 1998 and processing of
the same commenced. It is expected that an approval will be received prior to
the BKLA Meeting, but there can be no assurance that such approval will be
obtained. Western and BKLA sought a waiver of jurisdiction from the Federal
Reserve Board on June 30, 1998 and said waiver was granted on July 8, 1998.
    
 
  STATE COMMISSIONER APPROVAL
 
   
    Because BKLA and Santa Monica Bank are state-chartered banks, Santa Monica
Bank must obtain approval of the State Commissioner pursuant to the California
Financial Code prior to the consummation of the Merger. Santa Monica Bank sought
such approval by filing an application with the State Commissioner on or about
June 30, 1998. The application submitted to the State Commissioner for approval
was accepted as complete on July 7, 1998. It is expected that an approval will
be received prior to the BKLA Meeting, but there can be no assurance that such
approval will be obtained.
    
 
RESALE OF WESTERN COMMON STOCK
 
    All shares of Western Common Stock received by BKLA Shareholders in the
Merger will be freely transferrable, except that shares of Western Common Stock
received by BKLA Shareholders who are deemed to be "affiliates" (as defined for
purposes of Rule 145 under the Securities Act or SEC Accounting Series Releases
130 and 135) of BKLA ("BKLA Affiliates") as of the date of the BKLA Meeting may
be resold by BKLA Affiliates only pursuant to an effective registration
statement under the Securities Act covering resales of such shares or in
transactions permitted by the resale provisions of Rule 145 of the Securities
Act or as otherwise permitted under the Securities Act. Persons who may be
deemed to be affiliates of BKLA or Western generally include individuals or
entities that control, are controlled by, or are under common control with, such
entities and may include certain officers and directors of such entities as well
as principal shareholders of such entities.
 
    BKLA has agreed in the Merger Agreement to use its best efforts to obtain a
written agreement from each officer or director of BKLA who is identified as a
possible BKLA Affiliate providing that each such person will not sell, pledge,
transfer or otherwise dispose of any shares of Western Common Stock to be
received by such person in the Merger, except in compliance with the applicable
provisions of the Securities Act. See "THE MERGER AGREEMENT--Exchange of Stock
Certificates; Dividends".
 
CERTAIN EFFECTS OF THE MERGER
 
   
    SMB will be the Surviving Corporation following the Merger. Once the Merger
is consummated, the trading of BKLA Common Stock on Nasdaq will cease, and BKLA
will no longer be required to file reports pursuant to the Exchange Act. It is
anticipated that the management and operation of SMB and BKLA will be integrated
after the Merger and will allow additional services to be provided to customers,
without adversely affecting current day-to-day service. Such additional services
would include greater resources, trust services, increased operational
efficiencies, the cost savings of which may translate into lower prices for
customers, and an ability to service larger customers with larger transactions.
BKLA has agreed, subject to certain conditions, at or before the Effective Time,
to make such accounting adjustments as Western requests in order to implement
its plans regarding BKLA or to reflect merger-related expenses and costs
incurred by BKLA. See "THE MERGER AGREEMENT--Certain Covenants--CERTAIN POLICIES
OF BKLA".
    
 
                                       82
<PAGE>
   
    Certain historical regulatory capital ratios for SMB and BKLA as of June 30,
1998 are listed below. The pro forma column reflects certain effects that the
Merger will have on Santa Monica Bank's financial statements.
    
 
   
<TABLE>
<CAPTION>
                                                            REQUIREMENT                   HISTORICAL
                                                    ----------------------------  --------------------------   SANTA MONICA
                                                     ADEQUATELY        WELL        SANTA MONICA                BANK AND BKLA
                                                     CAPITALIZED    CAPITALIZED        BANK          BKLA        PRO FORMA
                                                    -------------  -------------  ---------------  ---------  ---------------
                                                     (GREATER THAN OR EQUAL TO)
<S>                                                 <C>            <C>            <C>              <C>        <C>
Tier I Leverage...................................         4.00%          5.00%           7.09%         9.62%         7.27%
Tier I Risk-based.................................         4.00           6.00           10.01         14.43         10.39
Total Risk-based..................................         8.00          10.00           11.27         15.68         11.65
</TABLE>
    
 
   
    The capital ratios listed above are governed by guidelines created by the
Financial Institutions Reform, Recovery and Enforcement Act of 1989 ("FIRREA").
FIRREA's guidelines are intended to provide a systematic framework with which to
analyze banking organizations. In order to analyze a banking organization's
business, the guidelines split total capital into two components: Tier I capital
(core capital) and Tier II capital (supplementary capital). For BKLA and Santa
Monica Bank, Tier I capital consists of common stock shareholders' equity before
gain or loss on securities available for sale, less goodwill and other
intangible assets. Tier II capital consists of loan loss reserves limited to
1.25% of risk-weighted assets. Total capital is Tier I plus Tier II capital.
    
 
   
    The Tier I leverage ratio is Tier I capital divided by average total assets
less intangibles. For banks rated in the highest category of the five categories
used by the FDIC to rate banks, the minimum leverage ratio in such category is
3%. For all banks not rated in the highest category, the minimum leverage ratio
must be at least 100 to 200 base points above the 3% minimum, or 4% to 5%.
    
 
   
    In addition to the Tier I leverage ratio, the FDIC takes into account
risk-based ratios as well. Tier I risk-based capital is Tier I capital divided
by net risk-weighted assets. Total capital to risk-based assets is total capital
divided by net risk-weighted assets. These risk-based guidelines are intended to
provide a measure of capital that reflects the degree of risk associated with a
banking organization's operations.
    
 
   
    After the Merger, SMB will be headquartered at 1251 Fourth Street, Santa
Monica, California 90401. The telephone number at such offices will be (310)
394-9611.
    
 
INTERESTS OF CERTAIN PERSONS IN THE MERGER
 
  GENERAL
 
   
    In considering the recommendations of the BKLA Board, BKLA Shareholders
should be aware that certain employees and members of BKLA Management and of the
BKLA Board have certain interests in the transactions contemplated by the Merger
Agreement that are in addition to the interests of shareholders generally and
that may create potential conflicts of interest. These interests include, among
others, provisions in the Merger Agreement relating to the indemnification of
BKLA officers and directors, directors' and officers' liability insurance, the
appointment of Adriana M. Boeka to the Western Board as of the Effective Time,
and certain employee benefits discussed below.
    
 
   
    Additionally, Scott Burford, son of the late Maurice J. Burford and
president of Burford Capital, provided consulting services to BKLA through GBS
Financial in connection with the Merger. GBS entered into an agreement pursuant
to which it will receive a flat fee of 1% of value received by BKLA shareholders
if BKLA is sold for between $15 per share and $16.99 per share, or 1.5% of the
value received if BKLA is sold for $17 per share or more. Assuming consummation
of the Merger upon the terms and conditions contained in the Merger Agreement,
GBS will receive approximately $1.5 million for its services. GBS Financial will
receive no compensation if BKLA sells for less than $15 per share or if the
Merger is not consummated.
    
 
                                       83
<PAGE>
    Further, American West Associates is a partnership which leases the Encino
branch building to BKLA for approximately $277,000 per year. Melvin F. Shaw and
Burton N. Sterman, directors of BKLA, are 15% and 17% partners, respectively, of
American West Associates. BKLA Management believes this transaction to be on
substantially the same terms as those prevailing at the time for comparable
transactions.
 
  INDEMNIFICATION; DIRECTORS' AND OFFICERS' INSURANCE
 
    The Merger Agreement provides that for a period of six years after the
Effective Time, Western will indemnify each director and officer determined as
of the Effective Time, against certain liabilities arising out of matters
existing or occurring at or prior to the Effective Time to the extent to which
such indemnified parties were entitled under California law and BKLA's articles
of incorporation or bylaws in effect on April 16, 1998. Western also will
advance expenses as incurred to the extent permitted under California law and
BKLA's articles of incorporation and bylaws. In addition, for a period of six
years after the Effective Time, Western will use its reasonable best efforts to
cause to be maintained in effect the current policies of directors' and
officers' liability insurance maintained by BKLA, provided that Western may
substitute therefor policies of comparable coverage with respect to claims
arising from facts or events that occurred before the Effective Time.
 
  APPOINTMENT OF DIRECTOR
 
    Pursuant to the Merger Agreement, BKLA has elected to nominate, and Western
has consented to appoint, Adriana M. Boeka to the Western Board as of the
Effective Time.
 
  EMPLOYEE BENEFITS
 
    Pursuant to the Merger Agreement, all benefit and compensation plans,
contracts, policies or arrangements covering current employees or former
employees of BKLA and its subsidiaries and current or former directors of BKLA,
including, but not limited to, "employee benefit plans" within the meaning of
Section 3(3) of ERISA, and deferred compensation, stock option, stock purchase,
stock appreciation rights, stock based, incentive and bonus plans will be
governed, managed and/or terminated by Western in Western's sole discretion from
and after the Effective Date. See "THE MERGER AGREEMENT-- Certain
Covenants--EMPLOYEE BENEFITS".
 
  RELATED TRANSACTIONS
 
    Other than the Merger Agreement, the Shareholder Agreements, the Stock
Option Agreement and the transactions contemplated by and described in this
Proxy Statement-Prospectus, Western and BKLA do not know of any past, present or
proposed material contracts, arrangements or understandings between Western or
its affiliates, on the one hand, and BKLA and its affiliates, on the other hand.
 
  STOCK OPTIONS
 
    Upon delivery of notice by the BKLA Board to holders of BKLA Stock Options
of the pendency of the Merger, any option granted prior to the Merger shall be
exercisable in full and not only as to those shares with respect to which
installments, if any, have then accrued, subject, however, to earlier expiration
or termination as provided elsewhere in BKLA's stock option plan.
 
   
    At the Effective Time, all BKLA Stock Options, unless otherwise exercised
pursuant to Section 10 of BKLA's stock option plan, shall be converted into the
right to receive for each share of BKLA Common Stock otherwise issuable upon
exercise thereof a number of shares of Western Common Stock equal to the
quotient obtained by dividing the spread by $42.61. After accumulating all such
Replacement Shares issuable to any holder of BKLA Stock Options, any fractional
Replacement Shares issuable to any holder of BKLA Stock Options of .2 or above
shall be rounded upwards. See "NOTES TO UNAUDITED PRO
    
 
                                       84
<PAGE>
FORMA COMBINED CONDENSED FINANCIAL DATA--NOTE 1" and "THE MERGER
AGREEMENT--Exchange of Stock Certificates; Dividends".
 
   
    As of the BKLA Record Date, there were 322,850 options outstanding, and
executive officers of BKLA held the following unvested options to purchase BKLA
Common Stock which will vest at the Effective Time as a result of the Merger:
    
 
   
<TABLE>
<CAPTION>
                                                      NUMBER OF UNVESTED OPTIONS     VALUE AT THE BKLA RECORD DATE
                                                    WHICH BECOME EXERCISABLE AT THE  OF OPTIONS WHICH VEST AT THE
NAME                                                        EFFECTIVE TIME                EFFECTIVE TIME (1)
- --------------------------------------------------  -------------------------------  -----------------------------
<S>                                                 <C>                              <C>
John J. Feldman...................................                56,250                     $     605,340
Adriana M. Boeka..................................                29,500                           217,767
Robert G. Jacobsen................................                17,750                           181,640
Wendy Moskal......................................                19,000                           187,870
                                                                 -------                       -----------
                                                                 122,500                     $   1,192,617
</TABLE>
    
 
- ------------------------
 
   
(1) Value is based on the closing sale price for Western Common Stock as
    reported by Nasdaq multiplied by the Conversion Number of 0.4224 on the BKLA
    Record Date, less the weighted average per share exercise price.
    
 
SUBMISSION OF SHAREHOLDERS' PROPOSALS FOR BKLA'S 1999 ANNUAL MEETING
 
   
    In the event that the Merger is not consummated as contemplated in the
Merger Agreement, BKLA Shareholders may submit proposals for shareholder action
at the 1999 Annual Meeting of BKLA Shareholders if they do so in accordance with
applicable regulations of the Commission. Any such proposals must be submitted
to Beverly A. Dyck, Corporate Secretary of BKLA, no later than November 5, 1998,
in order to be considered for inclusion in BKLA's 1999 proxy materials.
    
 
DISSENTERS' RIGHTS
 
   
    In connection with the Merger, the Shareholders may be entitled to
Dissenters' Rights under Chapter 13 of the CGCL, attached hereto as Appendix C.
The description of Dissenters' Rights contained in this Proxy
Statement-Prospectus is qualified in its entirety by reference to Chapter 13 of
the CGCL. IN ORDER FOR A BKLA SHAREHOLDER TO EXERCISE DISSENTERS' RIGHTS, A
NOTICE OF SUCH SHAREHOLDER'S INTENTION TO EXERCISE HIS OR HER DISSENTERS' RIGHTS
AS PROVIDED IN THE CGCL MUST BE SENT BY SUCH SHAREHOLDER AND RECEIVED BY BKLA ON
OR BEFORE THE DATE OF THE BKLA MEETING, AND SUCH SHAREHOLDER MUST VOTE AGAINST
THE APPROVAL OF THE PRINCIPAL TERMS OF THE MERGER AND COMPLY WITH SUCH OTHER
PROCEDURES AS REQUIRED BY THE CGCL, AS MORE FULLY DESCRIBED BELOW. FAILURE TO
SEND SUCH NOTICE, TO VOTE AGAINST THE PRINCIPAL TERMS OF THE MERGER OR TO FOLLOW
SUCH OTHER PROCEDURES WILL RESULT IN A WAIVER OF SUCH SHAREHOLDER'S DISSENTERS'
RIGHTS.
    
 
   
    Any demands, notices, certificates or other documents delivered to BKLA
prior to the Merger may be sent to Beverly A. Dyck, Corporate Secretary, Bank of
Los Angeles, 8901 Santa Monica Boulevard, West Hollywood, California 90069.
Thereafter, they may be sent to Julius G. Christensen, Executive Vice President,
General Counsel and Secretary, Western Bancorp, 4100 Newport Place, Suite 900,
Newport Beach, California 92660.
    
 
    If no instructions are indicated on proxies received by BKLA, such proxies
will be voted for the proposal to approve the principal terms of the Merger at
the BKLA Meeting. Those BKLA Shareholders who return their proxies without
instructions, resulting in a vote for the approval of the principal terms of the
Merger, will not be entitled to Dissenters' Rights.
 
   
    In addition, because the BKLA Common Stock is traded on Nasdaq, BKLA
Shareholders will not have Dissenters' Rights unless demands for purchase in
cash of such shares at their fair market value as of April 16, 1998 pursuant to
Section 1301 of the CGCL (each, a "Demand"), are made with respect to 5% or
    
 
                                       85
<PAGE>
more of the outstanding shares of BKLA Common Stock, (before giving effect to
the Merger). Such Demands must be received by BKLA or its transfer agent not
later than the date of the BKLA Meeting. In the event that Demands are made with
respect to 5% or more of the outstanding shares of BKLA Common Stock on or
before the date of the BKLA Meeting, the BKLA Shareholders who made Demands will
be entitled to Dissenters' Rights, provided that such Dissenters' Rights are
perfected pursuant to Chapter 13 of the CGCL.
 
    In the event that (i) the Merger is approved by the BKLA Shareholders and
(ii) Demands are made by holders of 5% or more of the BKLA Common Stock, a
holder of BKLA Common Stock who objects to the Merger (a "Dissenting
Shareholder") will be entitled to payment in cash of the fair market value as of
April 16, 1998 (the day before the public announcement of the Merger) of his or
her Shares ("Dissenting Shares"); provided that (a) such shares were outstanding
immediately prior to the date for the determination of shareholders entitled to
vote on the Merger; (b) the Dissenting Shareholder voted his or her shares
against the approval of the principal terms of the Merger; (c) the Dissenting
Shareholder made a Demand; and (d) the Dissenting Shareholder has submitted for
endorsement certificates representing his or her Dissenting Shares, in
accordance with Section 1302 of the CGCL.
 
    The Demand must (a) be a written demand to purchase the Dissenting Shares
and make payment to the Dissenting Shareholder in cash of their fair market
value as of April 16, 1998; (b) be received by BKLA on or before the date of the
BKLA Meeting; (c) state the number and class of the shares held of record by the
Dissenting Shareholder that the Dissenting Shareholder demands that BKLA
purchase; and (d) contain a statement of what the Dissenting Shareholder claims
to be the fair market value of his or her Dissenting Shares as of April 16,
1998. Such statement of the fair market value constitutes an offer by the
Dissenting Shareholder to sell his or her Dissenting Shares at such price. A
Dissenting Shareholder who has made such a demand for payment may not withdraw
such Demand unless BKLA consents thereto. A proxy or vote against the approval
of the principal terms of the Merger Agreement does not in itself constitute a
Demand.
 
    The Dissenting Shareholder must submit the certificates representing the
Dissenting Shares for endorsement as Dissenting Shares to BKLA at its principal
office or at the office of its transfer agent within 30 days after the date on
which notice of approval of the Merger by BKLA Shareholders was mailed to such
Dissenting Shareholder.
 
   
    If any Shareholder has Dissenters' Rights, BKLA will mail to each such
shareholder a notice of the approval of the Merger by the BKLA Shareholders,
within ten days after the date of such approval, accompanied by (a) a copy of
Sections 1300, 1301, 1302, 1303 and 1304 of Chapter 13 of the CGCL; (b) a
statement of the price determined by BKLA to represent the fair market value as
of April 16, 1998 of the Dissenting Shares (which BKLA believes to be the
closing price on April 16, 1998 of $16.50); and (c) a brief description of the
procedure to be followed if the shareholder desires to exercise his or her
Dissenters' Rights under such sections. The statement of price constitutes an
offer by BKLA to purchase such Dissenting Shares.
    
 
   
    If BKLA denies that shares submitted to it as Dissenting Shares are
Dissenting Shares, or if BKLA and a Dissenting Shareholder fail to agree on the
fair market value of the Dissenting Shares, either such Dissenting Shareholder
or BKLA may file a complaint in the Superior Court of the proper county in
California requesting that the court determine such issue. Such complaint must
be filed within six months after the date on which notice of the approval of the
Merger is mailed to Dissenting Shareholders. It is the opinion of BKLA that the
fair market value of its Shares with regard to valuation for Dissenting Share
purposes is $16.50, the closing price of BKLA Common Stock as reported on the
Nasdaq for April 16, 1998, the day prior to announcement of the Merger.
    
 
    On trial of the action, the court will first determine if the shares are
Dissenting Shares, and if so determined, the court will either determine the
fair market value or appoint one or more impartial appraisers to do so. If both
BKLA and the Dissenting Shareholder fail to file a complaint within six months
 
                                       86
<PAGE>
after the date on which notice of the approval of the Merger was mailed to the
Dissenting Shareholders, such Dissenting Shareholder will lose his or her
Dissenters' Rights. In addition, if the Dissenting Shareholder transfers such
Dissenting Shares prior to their submission for the required endorsement, such
shares will lose their status as Dissenting Shares.
 
    FAILURE TO TAKE ANY NECESSARY STEP WILL RESULT IN A TERMINATION OR WAIVER OF
THE RIGHTS OF THE HOLDER UNDER CHAPTER 13 OF THE CGCL. A PERSON HAVING A
BENEFICIAL INTEREST IN BKLA COMMON STOCK THAT IS HELD OF RECORD IN THE NAME OF
ANOTHER PERSON, SUCH AS A TRUSTEE OR NOMINEE, MUST ACT PROMPTLY TO CAUSE THE
RECORD HOLDER TO FOLLOW THE REQUIREMENTS OF CHAPTER 13 OF THE CGCL IN A TIMELY
MANNER IF SUCH PERSON ELECTS TO DEMAND PAYMENT OF THE FAIR MARKET VALUE OF SUCH
SHARES.
 
ACCOUNTING TREATMENT
 
   
    For accounting and financial reporting purposes, it is currently expected
that the Merger will be accounted for as a pooling of interests in accordance
with GAAP, and comfort by the independent auditors for both Western and BKLA of
the ability to use such accounting treatment is one of the conditions to the
consummation of the Merger. Under this method of accounting, the previously
recorded assets and liabilities of Santa Monica Bank and BKLA would be carried
forward to SMB at their recorded amounts; income and expenses of SMB would
include income and expenses of Santa Monica Bank and BKLA for the entire fiscal
year in which the Merger occurs; and the reported results of the separate
corporations for prior periods would be combined and restated as the results of
SMB. The results of the pooling treatment for accounting purposes would be
reflected in historical consolidated financial statements of Western.
    
 
   
    Confirmation by the independent auditors of each of Western and BKLA of the
ability to use the pooling-of-interest method of accounting to account for the
Merger is one condition (the "Pooling Condition") to consummation of the Merger.
Such confirmation is to be delivered shortly prior to each of the mailing date
of this Proxy Statement-Prospectus and the Effective Date. In the event that the
Pooling Condition is not satisfied, each of Western and BKLA may terminate the
Merger Agreement for failure of the Pooling Condition. However, if both Western
and BKLA decide to waive in writing the Pooling Condition prior to the Effective
Time, the Merger will be consummated and will be accounted for using the
purchase method of accounting, provided that all other conditions to
consummation of the Merger are fulfilled or waived in writing.
    
 
                                       87
<PAGE>
                              THE MERGER AGREEMENT
 
    SET FORTH BELOW IS A DESCRIPTION OF CERTAIN OF THE TERMS AND CONDITIONS OF
THE MERGER AGREEMENT AND RELATED MATTERS. THIS SUMMARY OF THE TERMS AND
CONDITIONS OF THE MERGER AGREEMENT DOES NOT PURPORT TO BE COMPLETE AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE FULL TEXT OF THE MERGER AGREEMENT
AS SET FORTH IN APPENDIX A HERETO AND THE TEXT THEREOF IS INCORPORATED BY
REFERENCE HEREIN.
 
THE MERGER
 
   
    The Merger Agreement was entered into by and among Western, Santa Monica
Bank and BKLA on April 16, 1998, and amended and restated as of June 24, 1998
and July 16, 1998. Pursuant to the Merger Agreement, at the Effective Time, BKLA
will merge with Santa Monica Bank, with Santa Monica Bank being the Surviving
Corporation and operating under the name "Santa Monica Bank". The separate
corporate existence of BKLA will then cease. In connection with the Merger, each
share of BKLA Common Stock issued and outstanding at the Effective Time (other
than (a) shares that have not been voted in favor of approval of the principal
terms of the Merger and with respect to which Dissenters' Rights have been
perfected in accordance with the CGCL and (b) shares held by any of BKLA's
subsidiaries or by Western or any of its Subsidiaries, in each case other than
in a fiduciary (including custodial or agency) capacity or as a result of debts
previously contracted in good faith) will be converted automatically into,
subject to the limitations set forth in the Merger Agreement with respect to
proration and fractional shares, the Consideration. Each share of Western Common
Stock outstanding immediately prior to the Effective Time will remain
outstanding after the Merger as one share of Western Common Stock.
    
 
    At the Effective Time, all BKLA Stock Options, unless otherwise exercised
pursuant to BKLA's stock option plan, shall be converted into the right to
receive for each share of BKLA Common Stock otherwise issuable upon exercise
thereof a number of shares of Western Common Stock equal to the quotient
obtained by dividing the Spread by $42.61. At the Effective Time, each BKLA
Warrant shall be converted into a warrant to acquire, on the same terms and
conditions as were applicable under such BKLA warrant agreement, the number of
shares of Western Common Stock equal to (a) the number of shares of BKLA Common
Stock subject to the BKLA Warrant, multiplied by (b) the Conversion Number (such
product rounded down to the nearest whole number), at an exercise price for the
share (rounded up to the nearest whole cent) equal to (y) the aggregate exercise
price for the shares of BKLA Common Stock which were purchasable pursuant to
such BKLA Warrant divided by (z) the number of full shares of Western Common
Stock subject to such Replacement Warrant.
 
    It is expected that the Merger will be a reorganization within the meaning
of Section 368(a) of the Code. See "THE MERGER--Certain Federal Income Tax
Consequences".
 
EFFECTIVE TIME AND EFFECTIVE DATE
 
    On a date to be selected by Western, which will be within ten days after the
last to occur of the expiration of all applicable waiting periods in connection
with approvals of governmental authorities and the receipt of all approvals of
governmental authorities and all conditions to the consummation of the Merger
being satisfied or waived (or, at the election of Western, on the last business
day of the month in which such tenth day occurs or, if such tenth day occurs on
one of the last five business days of such month, on the last business day of
the succeeding month), or on such earlier or later date as may be agreed in
writing by Western and BKLA, an agreement of merger will be executed in
accordance with all appropriate legal requirements and will be filed as required
by law, and the Merger will become effective upon such filing or on such date as
may be specified in such agreement of merger. The date of such filing or such
later effective date is herein called the "EFFECTIVE DATE". The "EFFECTIVE TIME"
of the Merger will be the time of such filing or as set forth in such agreement
of merger.
 
                                       88
<PAGE>
EXCHANGE OF STOCK CERTIFICATES; DIVIDENDS
 
    At or prior to the Effective Time, Western will deposit, or will cause to be
deposited, with U.S. Stock Transfer or with such other unaffiliated exchange
agent as Western will reasonably select (in such capacity, the "Exchange
Agent"), for the benefit of the holders of certificates formerly representing
shares of BKLA Common Stock ("Old Certificates"), for exchange, certificates
representing the shares of Western Common Stock ("New Certificates") and an
estimated amount of cash to be paid in exchange for outstanding shares of BKLA
Common Stock.
 
    As soon as practicable, but no later than five (5) business days after the
Effective Date, Western will send or cause to be sent to each former holder of
record of shares of BKLA Common Stock immediately prior to the Effective Time
transmittal materials (the "Letter of Transmittal") for use in exchanging such
shareholder's Old Certificates for the Consideration. Western will cause the New
Certificates into which shares of a shareholder's BKLA Common Stock are
converted on the Effective Date and/or any check in respect of any fractional
share interests or dividends or distributions which such person will be entitled
to receive to be delivered to such shareholder upon delivery to the Exchange
Agent of Old Certificates representing such shares of BKLA Common Stock owned by
such shareholder. No interest will be paid on any such cash to be paid in lieu
of fractional share interests or in respect of dividends or distributions which
any such person will be entitled to receive upon such delivery.
 
    At the election of Western, no dividends or other distributions with respect
to Western Common Stock with a record date occurring after the Effective Time
will be paid to the holder of any unsurrendered Old Certificate representing
shares of BKLA Common Stock converted in the Merger into the right to receive
shares of such Western Common Stock until the holder thereof will be entitled to
receive New Certificates in exchange therefor in accordance with the procedures
set forth in the Merger Agreement, and no such shares of BKLA Common Stock will
be eligible to vote until the holder of Old Certificates is entitled to receive
New Certificates in accordance with the procedures set forth in the Merger
Agreement. After becoming so entitled in accordance with Section 3.04 of the
Merger Agreement, the record holder thereof also will be entitled to receive any
such dividends or other distributions, without any interest thereon, which
theretofore had become payable with respect to shares of Western Common Stock
such holder had the right to receive upon surrender of the Old Certificate.
 
    BKLA SHAREHOLDERS SHOULD NOT FORWARD BKLA COMMON STOCK CERTIFICATES TO THE
EXCHANGE AGENT UNTIL THEY HAVE RECEIVED TRANSMITTAL FORMS. BKLA SHAREHOLDERS
SHOULD NOT RETURN CERTIFICATES WITH THE ENCLOSED PROXY.
 
NO FRACTIONAL SHARES
 
   
    No fractional shares of Western Common Stock will be issued in the Merger.
In lieu of the issuance of any fractional share of Western Common Stock that
would otherwise be issuable in conversion or exchange for warrants, a cash
adjustment will be paid to BKLA Shareholders in an amount equal to such
fractional proportion of the price of a share of Western Common Stock as of the
close of business on the day immediately prior to the Effective Time. In lieu of
the issuance of any fractional share of Western Common Stock that would
otherwise be issuable in accordance with the Stock Option Agreement, any
Fractional Replacement Shares of holders of BKLA Stock Options of 0.2 or above
shall be rounded upwards. See "NOTES TO UNAUDITED PRO FORMA COMBINED CONDENSED
FINANCIAL DATA" and "THE MERGER--Interests of Certain Persons in the
Merger--STOCK OPTIONS".
    
 
CONDUCT OF THE BUSINESS OF BKLA AND WESTERN PRIOR TO THE MERGER
 
    Pursuant to the Merger Agreement, each of Western and BKLA has agreed that,
during the period from the date of the Merger Agreement until the Effective
Time, except as permitted by the Merger Agreement, each will not (a) take any
action that would adversely affect or delay the ability of BKLA or
 
                                       89
<PAGE>
Western to perform any of their obligations on a timely basis under the Merger
Agreement, or take any action that is reasonably likely to have a material
adverse effect on BKLA or Western; or (b) (i) take any action which it knows or
reasonably should know that such action would, or would be reasonably likely to,
prevent or impede the Merger from qualifying (A) for pooling-of-interests
accounting treatment or (B) as a reorganization within the meaning of Section
368 of the Code; or (ii) knowingly take any action that is intended or is
reasonably likely to result in (A) any of its representations and warranties set
forth in the Merger Agreement being or becoming untrue in any material respect
at any time at or prior to the Effective Time, (B) any of the conditions to the
Merger set forth in Article VII of the Merger Agreement not being satisfied or
(C) a violation of any provision of the Merger Agreement.
 
    In addition, BKLA has agreed that, during the same period, it will not,
subject to certain exceptions, without the prior consent of Western, (a) conduct
the business of BKLA other than in the ordinary and usual course; (b) (i) issue,
sell or otherwise permit to become outstanding, or authorize the creation of,
any additional shares of BKLA Common Stock or preferred stock, (ii) enter into
any agreement with respect to the foregoing or (iii) permit any additional
shares of BKLA Common Stock to become subject to new grants of employee or
director stock options or other similar stock-based employee rights; (c) (i)
make, declare, pay or set aside for payment any dividend or declare or make any
distribution or (ii) directly or indirectly adjust, split, combine, redeem,
reclassify, purchase or otherwise acquire, any shares of its capital stock; (d)
increase the compensation of employees or directors, or make any other changes
with respect to compensation, other than (i) general increases in compensation
for employees, (ii) for grants of awards to newly hired employees consistent
with past practice, (iii) in accordance with applicable law or (iv) to satisfy
contractual obligations existing as of April 16, 1998; (e) enter into,
establish, adopt or amend any pension, retirement, stock option, or similar plan
or arrangement, or take any action to accelerate the vesting or exercisability
of stock options, restricted stock or other compensation or benefits payable
thereunder; (f) dispose of or discontinue any of its assets, deposits, business
or properties except in the ordinary course of business and in a transaction
that is not material to BKLA; (g) acquire all or any portion of, the assets,
business, deposits or properties of any other entity except in the ordinary
course of business; (h) make any capital expenditures other than those in the
ordinary course of business in amounts not exceeding $10,000 individually or
$50,000 in the aggregate; (i) amend its articles or by-laws; (j) implement or
adopt any change in its accounting principles or practices or methods; (k)
except in the ordinary course of business, enter into or terminate any material
contract or amend or modify in any material respect any existing material
contracts; (l) except in the ordinary course of business, settle any claim,
action or proceeding, except for those involving solely money damages in an
amount, individually or in the aggregate, not material to BKLA; (m) (i)
implement or adopt any material change in its interest rate and other risk
management policies, procedures or practices; (ii) fail to follow its existing
policies or practices with respect to managing its exposure to interest rate and
other risk; or (iii) fail to use commercially reasonable means to avoid any
material increase in its aggregate exposure to interest rate risk; (n) incur any
indebtedness for borrowed money other than in the ordinary course of business;
(o) make any loan, loan commitment or renewal or extension thereof to any person
which would, when aggregated with all outstanding loans, commitments for loans
or renewals or extensions thereof made by BKLA to such person and any affiliate
or immediate family member of such person, exceed $500,000 without submitting
loan package information to the chief credit officer of Western for review with
a right of comment at least one full business day prior to taking such action;
or (p) agree or commit to do any of the foregoing.
 
REPRESENTATIONS AND WARRANTIES
 
   
    The Merger Agreement contains various customary representations and
warranties relating to, among other things, (a) organization and similar
corporate matters; (b) the capital structure of each of BKLA, Western and Santa
Monica Bank; (c) authorization, execution, delivery, performance and
enforceability of the Merger Agreement and related matters; (d) conflicts under
articles or bylaws, required consents or approvals, and violations of any
agreements or law; (e) documents filed with the Commission and the FDIC and the
accuracy of information contained therein; (f) absence of certain material
adverse events,
    
 
                                       90
<PAGE>
changes, effects or undisclosed liabilities; (g) retirement and other employee
plans and matters relating to the Employee Retirement Income Security Act of
1974, as amended; (h) litigation; (i) compliance with law, including
environmental compliance; (j) tax returns and audits; (k) ownership of real
property; (l) absence of regulatory actions; and (m) labor matters.
 
CERTAIN COVENANTS
 
  ACQUISITION PROPOSALS
 
    Pursuant to the Merger Agreement, BKLA agrees that it will not, and will
cause its officers, directors, agents, advisors and affiliates not to, solicit
or encourage inquiries or proposals with respect to, or engage in any
negotiations concerning, or provide any confidential information to, or have any
discussions with, any person relating to, any tender or exchange offer, proposal
for a merger, consolidation or other business combination involving BKLA or any
proposal or offer to acquire in any manner a substantial equity interest in, or
a substantial portion of the assets or deposits of, BKLA, other than the
transactions contemplated by the Merger Agreement (any such proposal or offer
being referred to as an "Acquisition Proposal"), except to the extent legally
required for the discharge by the BKLA Board of its fiduciary duties as advised
by counsel to the BKLA Board.
 
    BKLA has also agreed, as of the date of the Merger Agreement, to immediately
cease and cause to be terminated any activities, discussions or negotiations
conducted prior to the date of the Merger Agreement with any parties other than
Western with respect to any of the foregoing and to use its reasonable best
efforts to enforce any confidentiality or similar agreement relating to an
Acquisition Proposal. BKLA will promptly (within 24 hours) advise Western
following the receipt by BKLA of any Acquisition Proposal and the substance
thereof (including the identity of the person making such Acquisition Proposal),
and advise Western of any developments with respect to such Acquisition Proposal
immediately upon the occurrence thereof.
 
  CERTAIN POLICIES OF BKLA
 
   
    At or before the Effective Time, BKLA will, consistent with GAAP and on a
basis mutually satisfactory to it and Western, modify and change its loan,
litigation and real estate valuation policies and practices (including loan
classifications and levels of reserves) so as to be applied on a basis that is
consistent with that of Western.
    
 
  EMPLOYEE BENEFITS
 
    Pursuant to Merger Agreement, from and after the Effective Date, all of
BKLA's benefit and compensation plans, contracts, policies or arrangements
covering employees or former employees of BKLA and current or former directors
of BKLA, including, but not limited to, "employee benefit plans" within the
meaning of Section 3(3) of ERISA, and deferred compensation, stock option, stock
purchase, stock appreciation rights, stock based, incentive and bonus plans,
will be governed, managed and/or terminated by Western in Western's sole
discretion.
 
  INDEMNIFICATION; DIRECTORS' AND OFFICERS' INSURANCE
 
    From and for a period of six years after the Effective Time, Western and SMB
have agreed to indemnify and hold harmless each director and officer of BKLA,
determined as of the Effective Time (the "Indemnified Parties"), against any
costs or expenses (including reasonable attorneys' fees), judgments, fines,
losses, claims, damages or liabilities (collectively, "Costs") incurred in
connection with any claim, action, suit, proceeding or investigation, whether
civil, criminal, administrative or investigative, arising out of matters
existing or occurring at or prior to the Effective Time (including with respect
to the Merger Agreement or any of the transactions contemplated thereby),
whether asserted, claimed or arising prior to, at or after the Effective Time,
to the extent to which such Indemnified Parties were entitled under
 
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California law and BKLA's articles of incorporation or bylaws in effect on April
16, 1998, and Western also will advance expenses as incurred to the extent
permitted under California law and BKLA's articles of incorporation and bylaws.
 
    Any Indemnified Party wishing to claim indemnification under the Merger
Agreement, upon learning of any such claim, action, suit, proceeding or
investigation, must as promptly as possible notify Western thereof, but the
failure so to notify will not relieve Western of any liability it may have to
such Indemnified Party if such failure does not materially prejudice Western. In
the event of any such claim, action, suit, proceeding or investigation (whether
arising before or after the Effective Time), (a) Western will have the right to
assume the defense thereof and Western will not be liable to such Indemnified
Parties for any legal expenses of other counsel or any other expenses
subsequently incurred by such Indemnified Parties in connection with the defense
thereof, except that if Western elects not to assume such defense, or counsel
for the Indemnified Parties advises that there are issues that raise conflicts
of interest between Western and the Indemnified Parties, the Indemnified Parties
may retain counsel satisfactory to them, and Western will pay the reasonable
fees and expenses of one such counsel for the Indemnified Parties in any
jurisdiction promptly as statements thereof are received; (b) the Indemnified
Parties will cooperate in the defense of any such matter; and (c) Western will
not be liable for any settlement effected without its prior written consent.
Notwithstanding the foregoing, Western will not have any obligation under the
Merger Agreement to any Indemnified Party when and if a court of competent
jurisdiction ultimately determines, and such determination becomes final and
nonappealable, that the indemnification of such Indemnified Party in the manner
contemplated hereby is not permitted or is prohibited by applicable law.
 
    Western also has agreed that for a period of six years after the Effective
Time, it will use its reasonable best efforts to cause to be maintained in
effect at a minimum the policies of directors' and officers' liability insurance
maintained by BKLA as of April 16, 1998 (provided that Western may substitute
therefor policies of comparable coverage with respect to claims arising from
facts or events that occurred before the Effective Time); PROVIDED, HOWEVER,
that in no event will Western be obligated to expend, in order to maintain or
provide insurance coverage pursuant to the Merger Agreement, any amount per
annum in excess of 125% of the amount of the annual premiums paid as of the date
of the Merger Agreement by BKLA for such insurance (the "Maximum Amount"). If
the amount of the annual premiums necessary to maintain or procure such
insurance coverage exceeds the Maximum Amount, Western will use all reasonable
efforts to maintain the most advantageous policies of directors' and officers'
insurance obtainable for an annual premium equal to the Maximum Amount.
Notwithstanding the foregoing, prior to the Effective Time, Western may request
BKLA to, and BKLA thereupon will, purchase insurance coverage, on such terms and
conditions as shall be acceptable to Western, extending for a period of six
years BKLA's directors' and officers' liability insurance coverage in effect as
of the date of the Merger Agreement (covering past or future claims with respect
to periods before the Effective Time) and such coverage will satisfy Western's
obligations under the Merger Agreement.
 
    If Western or any of its successors or assigns (a) shall consolidate with or
merge into any other corporation or entity and shall not be the continuing or
surviving corporation or entity of such consolidation or merger or (b) shall
transfer all or substantially all of its properties and assets to any
individual, corporation or other entity, then and in each such case, proper
provision will be made to ensure that the successors and assigns of Western
assume the obligations described above.
 
  NOTIFICATION OF CERTAIN MATTERS
 
    Western and BKLA each has agreed to give prompt notice to the other of any
fact, event or circumstance known to it that (i) is reasonably likely,
individually or taken together with all other facts, events and circumstances
known to it, to result in any material adverse effect with respect to it or (ii)
would cause or constitute a material breach of any of its representations,
warranties, covenants or agreements contained in the Merger Agreement.
 
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<PAGE>
  SECURITIES ACT
 
    Not later than the 15th day prior to the mailing of this Prospectus-Proxy
Statement to the BKLA Shareholders, BKLA has agreed to deliver to Western a
schedule of each person that, to the best of BKLA's knowledge, is or is
reasonably likely to be, as of the date of the BKLA Meeting, deemed to be a BKLA
Affiliate.
 
    BKLA will use its reasonable best efforts to cause each person who may be
deemed to be a BKLA Affiliate to execute and deliver to Western on or before the
date of mailing of this Prospectus-Proxy Statement to BKLA Shareholders an
agreement which provides that each such person will agree not to sell, pledge,
transfer or otherwise dispose of the shares of Western Common Stock to be
received by such person in the Merger except in compliance with the applicable
provisions of the Securities Act.
 
CONDITIONS
 
   
    The respective obligations of Western and BKLA to consummate the Merger are
subject to certain conditions, including (a) the approval by the BKLA
Shareholders of the principal terms of the Merger; (b) receipt of approvals
required by law in connection with the Merger and the other transactions
contemplated by the Merger Agreement (the parties having agreed that no such
approval will be deemed to have been received if it includes any condition or
requirement that would result in a material adverse effect on SMB or would
reduce the economic benefits of the Merger in so significant and adverse a
manner that Western would not have entered into the Merger Agreement had such
condition or requirement been known to it); (c) the absence of any statute,
rule, regulation, order, injunction or decree being in effect and prohibiting
the consummation of the Merger or any other transaction contemplated by the
Merger Agreement; (d) the Registration Statement having become effective and
there being issued no stop order suspending the effectiveness of the
Registration Statement and no proceedings for that purpose initiated or
threatened by the Commission; (e) the receipt and continued effectiveness of all
permits and other authorizations under state securities laws necessary to
consummate the transactions contemplated by the Merger Agreement and to issue
the shares of Western Common Stock to be issued in the Merger; (f) the approval
for listing on Nasdaq, subject to official notice of issuance, of the shares of
Western Common Stock to be issued in the Merger; (g) the receipt by each of
Western and BKLA from each of their respective accountants stating that in its
opinion the Merger will qualify for pooling-of-interests accounting treatment;
and (h) the receipt by each of Western and BKLA from Sullivan & Cromwell and
Vavrinek, respectively, each stating that in its opinion, the Merger will be
treated as a reorganization within the meaning of Section 368(a) of the Code.
    
 
   
    The obligations of Western and Santa Monica Bank to consummate the Merger
also are subject to the fulfillment or waiver by Western prior to the Effective
Time of certain conditions, including the following: (a) the representations and
warranties of BKLA being true and correct unless the failure so to be true and
correct is not likely to have a material adverse effect on BKLA; (b) the
performance by BKLA in all material respects of all obligations contained in the
Merger Agreement required to be performed by BKLA before the Effective Time; and
(c) receipt by Western of a customary "cold comfort" letter from Vavrinek, with
respect to certain financial statements and data of BKLA.
    
 
    In addition, the obligation of BKLA to consummate the Merger also is subject
to the fulfillment or waiver by BKLA prior to the Effective Time of certain
conditions, including the following: (a) the representations and warranties of
Western being true and correct unless the failure so to be true and correct is
not likely to have a material adverse effect on Western; (b) the performance by
Western in all material respects of all obligations contained in the Merger
Agreement required to be performed before the Effective Time; (c) receipt by
BKLA of a customary "cold comfort" letter from KPMG Peat Marwick LLP with
respect to certain financial statements and data of Western; and (d) as of the
Effective Time, the appointment by BKLA of a director to the Western Board.
 
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<PAGE>
TERMINATION
 
   
    The Merger Agreement may be terminated, and the Merger abandoned, prior to
the Effective Date, either before or after its approval by the BKLA
Shareholders: (a) by the mutual consent of Western and BKLA, if so determined by
their respective Boards; (b) by either of Western or BKLA, if so determined by
its Board, by written notice to the other, in the event of (i) the failure of
the BKLA Shareholders to approve the Merger at the BKLA Meeting, (ii) a material
breach by the other party of any representation, warranty, covenant or agreement
contained in the Merger Agreement that is not cured or not curable within 30
days after written notice of such breach is given to the party committing such
breach, or (iii) the Merger not having been consummated by December 31, 1998;
(c) by either of Western or BKLA, by written notice to the other, if any
approval of a governmental authority required to permit consummation of the
Merger or any transaction necessary to consummate the Merger shall have been
denied; (d) by BKLA, if with respect to any Ten Day Period (as defined below),
both (i)(A) the Ten Day Average Price (as defined below) shall be less than
$35.37 per share and (B) the Western Common Stock Price Percentage (as defined
below) shall be less than the BKX Index Percentage (as defined below) and (ii)
BKLA has delivered written notice to Western of its intention to terminate this
Agreement within forty-eight (48) hours following the date of such event; (e) by
Western, if the BKLA Board shall fail to recommend the Merger for approval by
the BKLA Shareholders; or (f) by BKLA, if the BKLA Board receives an Acquisition
Proposal and determines, based upon the written advice of counsel, to accept the
proposal and that proceeding with the Merger would violate fiduciary duties of
the BKLA Board to the BKLA Shareholders.
    
 
   
    "Western Common Stock Price Percentage" is defined in the Merger Agreement
to mean the percentage determined by dividing the Ten Day Average Price by
$42.61 (as such amount may be adjusted pursuant to the paragraph above); (x)
"BKX Index Percentage" means the percentage determined by dividing (i) the
product of (A) the Keefe Bank Index as of the date of determination times (B)
 .66 by (ii) the Keefe Bank Index as of the date hereof; (y) "Ten Day Average
Price" means the average sales price per share of Western Common Stock for a Ten
Day Period determined by averaging the last reported sales price on each trading
day; and (z) "Ten Day Period" means any period of ten (10) consecutive trading
days.
    
 
TERMINATION PAYMENT
 
    If the Merger Agreement is terminated by BKLA pursuant to a material breach
of any representation, warranty, covenant or agreement contained therein by
Western that is not cured or not curable within 30 days after written notice of
such breach is given to Western by BKLA, Western will pay to BKLA a fee equal to
BKLA's out-of-pocket expenses in connection with the Merger, up to $500,000. If
the Merger Agreement is terminated by Western pursuant to a material breach of
any representation, warranty, covenant or agreement contained therein by BKLA
that is not cured or not curable within 30 days after written notice of such
breach is given to BKLA by Western, or under the circumstances described in
clause (e) under "--Termination" above, BKLA shall pay to Western a fee equal to
BKLA's out-of-pocket expenses in connection with the Merger, up to $500,000. In
the event that there is a termination as a result of BKLA entering into an
Acquisition Proposal under the circumstances described in clause (e) under
"--Termination" above, BKLA shall pay Western up to $500,000 to cover
out-of-pocket expenses in addition to Western's rights under the Stock Option
Agreement.
 
EXPENSES
 
   
    The estimated aggregate Merger costs were $1.5 million for employer costs,
$0.5 million for conversion costs, $3.0 million for investment banking and other
professional fees, and $2.1 million for other costs. The total estimated
aggregate Merger costs are $5.4 million, after giving effect to an estimated
reduction of $1.7 million due to beneficial tax effects. All of these costs and
expenses incurred in connection with the Merger Agreement and the transactions
contemplated thereby shall be paid by the party incurring such costs or
expenses, except upon termination of the Merger Agreement under certain
circumstances. See "--Termination Payment".
    
 
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<PAGE>
                           THE STOCK OPTION AGREEMENT
 
GENERAL
 
   
    As an inducement and condition to Western's entering into the Merger
Agreement, BKLA entered into the Stock Option Agreement with Western. Pursuant
to the Stock Option Agreement, BKLA granted to Western an irrevocable Option,
exercisable only under certain limited and specifically defined circumstances,
none of which, to the best of BKLA's and Western's knowledge, has occurred as of
the date hereof, to purchase up to 945,585 authorized but theretofore unissued
shares of BKLA Common Stock (but in no event more than 19.9 percent of the
shares of BKLA Common Stock outstanding at the time of exercise), for a purchase
price per share of $17.375, calculated by taking the average of the daily
closing price of the BKLA Common Stock as reported on Nasdaq for the Ten Day
Period beginning April 10, 1998, subject to adjustment in certain circumstances.
The purchase of BKLA Common Stock pursuant to the Stock Option Agreement is
subject to compliance with applicable law, including receipt of any necessary
approvals under the BHCA.
    
 
    The Stock Option Agreement and the Option are intended to increase the
likelihood that the Merger will be consummated according to the terms set forth
in the Merger Agreement, and may be expected to discourage offers by third
parties to acquire BKLA prior to the Merger.
 
THE STOCK OPTION
 
   
    Western may exercise the Option, in whole or in part, at any time and from
time to time following the occurrence of certain events (each, a "Purchase
Event"), including (a) the acquisition by any person other than Western or any
subsidiary of Western of beneficial ownership of shares of BKLA Common Stock,
other than by exercise of existing options, warrants or other rights or as a
result of the execution and delivery of the Shareholder Agreements, such that,
upon the consummation of such acquisition, such person would have beneficial
ownership, in the aggregate, of 25 percent or more of the then outstanding
shares of BKLA Common Stock; or (b) the occurrence of certain other events (each
also referred to as a "Preliminary Purchase Event"), including:
    
 
    (i) BKLA or any of its subsidiaries (each a "BKLA Subsidiary"), without
having received Western's prior written consent, having entered into an
agreement to engage in an Acquisition Transaction (as defined herein) with any
person other than Western or any of its subsidiaries (each a "Western
Subsidiary") or the BKLA Board having recommended that the BKLA Shareholders
approve or accept any Acquisition Transaction with any person other than Western
or any Western Subsidiary;
 
    (ii) Any person, other than Western or any Western Subsidiary, having
acquired beneficial ownership or the right to acquire beneficial ownership,
other than by exercise of existing options, warrants or other rights, of shares
of BKLA Common Stock such that, upon the consummation of such acquisition, such
person would have beneficial ownership, in the aggregate, of ten percent or more
of the then outstanding shares of BKLA Common Stock;
 
   (iii) Any person, other than Western or any Western Subsidiary, having made a
BONA FIDE proposal to BKLA or its shareholders, by public announcement or
written communication that is or becomes the subject of public disclosure, to
engage in an Acquisition Transaction; or
 
    (iv) After a proposal is made by a third party to BKLA or its shareholders
to engage in an Acquisition Transaction, (A) BKLA having breached any covenant
or obligation contained in the Merger Agreement which breach would entitle
Western to terminate the Merger Agreement or (B) the holders of BKLA Common
Stock not approving the Merger Agreement at the meeting of such shareholders
held for the purpose of voting on the Merger Agreement, such meeting not having
been held or having been canceled prior to termination of the Merger Agreement
or the BKLA Board having withdrawn or modified in a manner adverse to Western
the recommendation of the BKLA Board with respect to the Merger Agreement.
 
                                       95
<PAGE>
    "Acquisition Transaction" is defined in the Stock Option Agreement to mean
(a) a merger or consolidation, or any similar transaction, involving BKLA or any
of BKLA's subsidiaries, (b) a purchase, lease or other acquisition of all or
substantially all of the assets of BKLA or any of BKLA's Subsidiaries or (c) a
purchase or other acquisition of securities representing ten percent or more of
the voting power of BKLA or any BKLA Subsidiary, other than by exercise of
existing options, warrants or other rights.
 
    The Stock Option Agreement also provides for certain adjustments intended to
protect Western against dilution of its rights to acquire BKLA Common Stock. The
Stock Option Agreement grants certain registration rights ("Registration
Rights") to Western with respect to the shares issuable upon exercise of the
Option.
 
TERMINATION
 
    The Option will terminate upon the earliest to occur of (a) the time
immediately prior to the Effective Time; (b) 12 months after the first
occurrence of a Purchase Event; (c) 18 months after the termination of the
Merger Agreement following the occurrence of a Preliminary Purchase Event; (d)
termination of the Merger Agreement in accordance with the terms thereof prior
to the occurrence of a Purchase Event or a Preliminary Purchase Event (other
than a termination of the Merger Agreement under the certain circumstances
referred to in the next clause (e)); or (e) 12 months after the termination of
the Merger Agreement upon the happening of certain events, including a material
breach of the Merger Agreement by BKLA and certain events relating to an
Acquisition Proposal.
 
                           THE SHAREHOLDER AGREEMENTS
 
   
    Western has entered into Shareholder Agreements with Adriana M. Boeka,
Maurice J. Burford, Mary Anne Chalker, Roy Doumani, John J. Feldman, Rickey M.
Gelb, Robert G. Jacobsen, Wendy R. Moskal, John R. Newhouse, James V. Reimann,
Melvin F. Shaw and Burton N. Sterman (the "Party Shareholders"), each a BKLA
Shareholder and a current director or trustee of an estate of a former director
of BKLA. The Party Shareholders, holding in the aggregate shares representing
approximately 18.0% of the total voting power of BKLA Common Stock as of the
BKLA Record Date, each agreed, in consideration of the substantial expenses
incurred by Western and Santa Monica Bank in connection with the Merger
Agreement and as a condition to Western and Santa Monica Bank entering into the
Merger Agreement, to vote or to cause to be voted, or to execute a written
consent with respect to, all of such Party Shareholder's shares of BKLA Common
Stock (a) in favor of adoption and approval of the Merger Agreement and the
Merger at every meeting of BKLA Shareholders at which such matters are
considered and at every adjournment thereof and in connection with every
proposal to take action by written consent with respect thereto; and (b) against
any other Acquisition Proposal at every meeting of the BKLA Shareholders at
which such matters are considered and at every adjournment thereof and in
connection with every proposal to take action by written consent with respect
thereto.
    
 
    Each Shareholder Agreement also provides that the Party Shareholder will
not, and will not permit any entity under its control to, deposit any of such
Party Shareholder's shares of BKLA Common Stock in a voting trust or subject any
such shares to any agreement, arrangement or understanding with respect to the
voting of such shares inconsistent with the Shareholder Agreement entered into
by that Party Shareholder. In addition, the Party Shareholders each agreed not
to sell, assign, transfer or dispose of any of his or her shares of BKLA Common
Stock during the term of the relevant Shareholder Agreement.
 
    The Shareholder Agreements will terminate upon the earlier to occur of the
Effective Time (except for certain provisions which will survive the Effective
Time) and the date on which the Merger Agreement is terminated in accordance
with its terms.
 
    The Shareholder Agreements bind the actions of the signatories thereto only
in their capacity as BKLA Shareholders. Those directors of BKLA who signed
Shareholder Agreements are not and could not be contractually bound to abrogate
their fiduciary duties as directors of BKLA. Accordingly, while such
 
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shareholders/directors are, under the Shareholder Agreements executed by them,
contractually bound to vote as a BKLA Shareholder in favor of the Merger and
against other Acquisition Proposals (should any be presented), their fiduciary
duties as BKLA directors nevertheless require them to act in their capacity as
directors in the best interest of BKLA when they decided to approve the Merger.
In addition, such shareholders/directors will continue to be bound by their
fiduciary duties as BKLA directors with respect to any decisions they may take
in connection with the Merger or otherwise.
    
 
                        COMPARISON OF SHAREHOLDER RIGHTS
 
COMPARISON OF CORPORATE STRUCTURE
 
   
    Both Western and BKLA are California corporations and as such are governed
by the CGCL. Listed below is a summary of the material differences in the rights
of the shareholders of Western Common Stock and BKLA Common Stock. Except as
otherwise noted below, there are no material differences with regard to electing
members of the board of directors, amending the articles of incorporation or
bylaws, calling special meetings of shareholders, acting by written consent of
shareholders without a meeting, indemnifying directors and other voting rights.
    
 
DIVIDENDS AND DIVIDEND POLICY
 
  BKLA
 
    As a California state bank, BKLA may not make a distribution without prior
approval of the State Commissioner to the BKLA Shareholders (including a payment
of dividends, but excluding stock dividends) which exceeds the lesser of (i) its
retained earnings and (ii) its net income for the last three fiscal years, less
the amount of any previous distributions during such period. With the approval
of the State Commissioner, BKLA may make a distribution not exceeding its
retained earnings, its net income for the past fiscal year or its net income for
the current fiscal year. To date, BKLA has not declared or paid any dividends.
 
  WESTERN
 
   
    Holders of Western Common Stock are entitled to receive dividends declared
by the Western Board out of funds legally available therefor under the laws of
the State of California, subject to the rights of holders of any preferred stock
of Western that may be issued after the date hereof. On August 20, 1997, the
Western Board approved the institution of a quarterly dividend and thereafter
declared a dividend of $0.15 per common share in the fourth quarter of 1997.
Western also paid a dividend in the first quarter of 1998 of $0.15 per common
share, and on May 20, 1998, the Western Board declared a dividend of $0.15 per
common share which was paid on June 26, 1998 to shareholders of record on June
5, 1998. The $0.15 cash dividend paid by Western in June of 1998 was
approximately 38% of diluted earnings per share of $0.39 and approximately 27%
of diluted earnings per share before goodwill amortization of $0.55.
    
 
   
    Western Management believes that it will be able to continue paying
quarterly dividends. However, because Western must comply with the CGCL and
banking regulations when paying dividends, there can be no assurance that
Western will continue to pay dividends at this level, if at all. In addition,
Western's ability to pay dividends is limited by a Third Amendment to Revolving
Credit Agreement, dated as of January 26, 1998, between Western and The Northern
Trust Company which provides that Western may not declare or pay any dividend
other than dividends payable in Western Common Stock or in the ordinary course
of business not to exceed 50% of net income per fiscal quarter of Western before
goodwill amortization and any restructuring charges incurred in connection with
any merger, consolidation or other restructuring contemplated by the SMB Merger
or similar transactions. See "RISK FACTORS--Regulation" and "INFORMATION
REGARDING WESTERN--Quarterly Dividend".
    
 
                                       97
<PAGE>
NUMBER OF DIRECTORS
 
   
    The bylaws of BKLA provide that the authorized number of directors of BKLA
shall be not less than six and not more than eleven. Currently, the actual
number of directors of BKLA is nine.
    
 
   
    The Western Restated Bylaws provide that the authorized number of directors
of Western shall not be less than nine nor more than fifteen and that any
amendment to the Western Restated Bylaws affecting the authorized number of
directors must be approved by a majority of the Western Shareholders, provided
that an amendment to the bylaws reducing the number of directors to a number
less than five cannot be adopted if the votes cast against its adoption are
equal to more than 16 2/3% of the outstanding shares entitled to vote on such
amendment. Currently, the actual number of directors of Western is nine. Upon
consummation of the Merger, the addition of Adriana M. Boeka to the Western
Board of Directors will increase the actual number of directors to ten.
    
 
INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
    Section 317 of the CGCL authorizes a court to award, or a corporation's
Board of Directors to grant, indemnity to directors, officers and employees in
terms sufficiently broad to permit such indemnification under certain
circumstances for liabilities (including reimbursement for expenses incurred)
arising under the Securities Act. Article Five of Western's restated articles of
incorporation provides for elimination of liability for monetary damages of its
directors, and Article Six of Western's Restated Articles of Incorporation and
Article VI of Western's Restated Bylaws provide for indemnification of its
directors, officers, employees and other agents to the fullest extent permitted
by the CGCL. Insofar as indemnification for liabilities arising under the
Securities Act may be permitted to directors, officers and controlling persons
of Western pursuant to the foregoing provisions, or otherwise, Western has been
advised that in the opinion of the Commission such indemnification is against
public policy as expressed in the Securities Act and is, therefore,
unenforceable.
 
                        VALIDITY OF WESTERN COMMON STOCK
 
    The validity of the shares of Western Common Stock to be issued in the
Merger has been passed upon by Julius G. Christensen, Executive Vice President,
General Counsel and Secretary of Western.
 
                                    EXPERTS
 
    The consolidated financial statements of Western and subsidiaries as of
December 31, 1997 and 1996, and for the years then ended, have been incorporated
by reference herein and in the registration statement in reliance on the report
of KPMG Peat Marwick LLP, independent auditors, incorporated by reference
herein, and upon the authority of said firm as experts in accounting and
auditing. Such report indicates that: (i) KPMG Peat Marwick LLP did not audit
either the 1996 consolidated financial statements of CCB or the 1996
consolidated financial statements of SCB, both of which were acquired during
1997 in mergers accounted for as poolings of interests. Such financial
statements were audited by other auditors whose reports were furnished to KPMG
Peat Marwick LLP, and KPMG Peat Marwick LLP's opinion, insofar as it related to
CCB and SCB, is based solely on the reports of the other auditors; (ii) the 1995
consolidated statements of operations, changes in shareholders' equity, and cash
flows of Western, prior to their restatement for the 1997 poolings of interest,
were audited by other auditors; (iii) the separate 1995 consolidated financial
statements of CCB and SCB included in the 1995 consolidated financial statements
of Western were audited by other auditors; and (iv) the combination of the
consolidated statements of operations, changes in shareholders' equity and cash
flows for the year ended December 31, 1995, after restatement for the 1997
poolings of interest, has been audited by KPMG Peat Marwick LLP.
 
    The consolidated financial statements of Western for the year ended December
31, 1995, prior to their restatement for the 1997 poolings of interest, have
been incorporated by reference herein in reliance upon
 
                                       98
<PAGE>
the report given thereto upon the authority of Vavrinek (the successor to Dayton
& Associates) as experts in accounting and auditing.
 
    The consolidated statements of financial condition of CCB and subsidiaries
as of December 31, 1996, and the related consolidated statements of operations,
changes in shareholders' equity and cash flows for each of the two years in the
period ended December 31, 1996, incorporated in this prospectus by reference
from the Annual Report on Form 10-K, for the year ended December 31, 1997, of
Western have been audited by Deloitte & Touche LLP, independent auditors, as
stated in their report, which is incorporated herein by reference, and has been
so incorporated in reliance upon the report of such firm given upon their
authority as experts in accounting and auditing.
 
    The consolidated balance sheet of SCB and subsidiary as of December 31,
1996, and the related consolidated statements of operations, changes in
shareholders' equity and cash flows for each of the two years in the period
ended December 31, 1996 incorporated in this prospectus by reference from the
Annual Report on Form 10-K, for the year ended December 31, 1997, of Western
have been audited by Deloitte & Touche LLP, independent auditors, as stated in
their report, which is incorporated herein by reference, and has been so
incorporated in reliance upon the report of such firm given upon their authority
as experts in accounting and auditing.
 
    The financial statements of Santa Monica Bank as of and for the years ended
December 31, 1997 and 1996, incorporated by reference from the Current Report on
Form 8-K/A, dated April 9, 1998 of Western, have been audited by Arthur Andersen
LLP, as indicated in their report thereto, and are incorporated by reference
herein in reliance upon the authority of said firm as experts in accounting and
auditing in giving said report.
 
    The statements of operations, changes in shareholders' equity and cash
flows, of Santa Monica Bank, for the year ended December 31, 1995 incorporated
in this prospectus by reference from the Current Report on Form 8-K/A, dated
April 9, 1998 of Western, have been audited by Deloitte & Touche LLP,
independent auditors, as stated in their report, which is incorporated herein by
reference, and has been so incorporated in reliance upon the report of such firm
given upon their authority as experts in accounting and auditing.
 
    The balance sheets of BKLA as of the years ended December 31, 1997 and 1996,
and the related statements of operations, changes in shareholders' equity and
cash flows for each of the three years in the period ended December 31, 1997,
incorporated herein by reference from the Current Report on Form 8-K filed by
Western on June 25, 1998, have been audited by Vavrinek, independent auditors,
as indicated in their report with respect thereto, and are incorporated herein
by reference in reliance upon the authority of said firm as experts in
accounting and auditing in giving said reports.
 
                                       99
<PAGE>
                                                                      APPENDIX A
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
   
                          SECOND AMENDED AND RESTATED
                          AGREEMENT AND PLAN OF MERGER
    
 
   
                           DATED AS OF JULY 16, 1998
    
 
                                  BY AND AMONG
 
                                WESTERN BANCORP
 
                               SANTA MONICA BANK
 
                                      AND
 
                              BANK OF LOS ANGELES
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                               TABLE OF CONTENTS
 
                                    RECITALS
 
<TABLE>
<CAPTION>
                                                                                                                  PAGE
                                                                                                                ---------
<S>        <C>                                                                                                  <C>
                                                        ARTICLE I
 
                                                   Certain Definitions
 
1.01       CERTAIN DEFINITIONS................................................................................        A-1
 
                                                       ARTICLE II
 
                                                       The Merger
 
2.01       THE MERGER.........................................................................................        A-4
2.02       EFFECTIVE DATE AND EFFECTIVE TIME..................................................................        A-5
 
                                                       ARTICLE III
 
                                           Consideration; Exchange Procedures
 
3.01       MERGER CONSIDERATION...............................................................................        A-5
3.02       RIGHTS AS SHAREHOLDERS; STOCK TRANSFERS............................................................        A-5
3.03       FRACTIONAL SHARES..................................................................................        A-6
3.04       EXCHANGE PROCEDURES................................................................................        A-6
3.05       ANTI-DILUTION PROVISIONS...........................................................................        A-7
3.06       OPTIONS............................................................................................        A-7
3.07       WARRANTS...........................................................................................        A-8
 
                                                       ARTICLE IV
 
                                               Actions Pending Acquisition
 
4.01       FOREBEARANCES OF BKLA..............................................................................        A-8
4.02       FOREBEARANCES OF WESTERN...........................................................................       A-10
 
                                                        ARTICLE V
 
                                             Representations and Warranties
 
5.01       DISCLOSURE SCHEDULES...............................................................................       A-10
5.02       STANDARD...........................................................................................       A-10
5.03       REPRESENTATIONS AND WARRANTIES OF BKLA.............................................................       A-11
5.04       REPRESENTATIONS AND WARRANTIES OF WESTERN..........................................................       A-17
 
                                                       ARTICLE VI
 
                                                        Covenants
 
6.01       REASONABLE BEST EFFORTS............................................................................       A-20
6.02       SHAREHOLDER APPROVAL...............................................................................       A-20
6.03       REGISTRATION STATEMENT.............................................................................       A-20
6.04       PRESS RELEASES.....................................................................................       A-21
6.05       ACCESS; INFORMATION................................................................................       A-21
6.06       ACQUISITION PROPOSALS..............................................................................       A-22
6.07       AFFILIATE AGREEMENTS...............................................................................       A-22
6.08       TAKEOVER LAWS......................................................................................       A-22
</TABLE>
 
                                       i
<PAGE>
<TABLE>
<CAPTION>
                                                                                                                  PAGE
                                                                                                                ---------
<S>        <C>                                                                                                  <C>
6.09       CERTAIN POLICIES...................................................................................       A-22
6.10       NASDAQ LISTING.....................................................................................       A-22
6.11       REGULATORY APPLICATIONS............................................................................       A-22
6.12       INDEMNIFICATION; DIRECTOR AND OFFICERS' INSURANCE..................................................       A-23
6.13       BENEFIT PLANS......................................................................................       A-24
6.14       ACCOUNTANTS' LETTERS...............................................................................       A-24
6.15       NOTIFICATION OF CERTAIN MATTERS....................................................................       A-24
6.16       SHAREHOLDER AGREEMENTS.............................................................................       A-24
 
                                                       ARTICLE VII
 
                                        Conditions to Consummation of the Merger
 
7.01       CONDITIONS TO EACH PARTY'S OBLIGATION TO EFFECT THE MERGER.........................................       A-24
7.02       CONDITIONS TO OBLIGATION OF BKLA...................................................................       A-25
7.03       CONDITIONS TO OBLIGATION OF WESTERN................................................................       A-25
 
                                                      ARTICLE VIII
 
                                                       Termination
 
8.01       TERMINATION........................................................................................       A-26
8.02       EFFECT OF TERMINATION AND ABANDONMENT..............................................................       A-27
8.03       TERMINATION FEE....................................................................................       A-27
 
                                                       ARTICLE IX
 
                                                      Miscellaneous
 
9.01       SURVIVAL...........................................................................................       A-28
9.02       WAIVER; AMENDMENT..................................................................................       A-28
9.03       COUNTERPARTS.......................................................................................       A-28
9.04       GOVERNING LAW; WAIVER OF JURY TRIAL................................................................       A-28
9.05       EXPENSES...........................................................................................       A-28
9.06       NOTICES............................................................................................       A-29
9.07       ENTIRE UNDERSTANDING; NO THIRD PARTY BENEFICIARIES.................................................       A-29
9.08       INTERPRETATION; EFFECT.............................................................................       A-29
 
EXHIBIT A  Form of Affiliate Agreement
EXHIBIT B  Form of Shareholder's Agreement
</TABLE>
 
                                       ii
<PAGE>
   
    SECOND AMENDED AND RESTATED AGREEMENT AND PLAN OF MERGER, dated as of July
16, 1998 (this "Agreement"), by and among Bank of Los Angeles ("BKLA"), Western
Bancorp ("Western") and Santa Monica Bank.
    
 
                                    RECITALS
 
    A.  BKLA.  BKLA is a California corporation, having its principal place of
business in West Hollywood, California.
 
    B.  WESTERN.  Western is a California corporation, having its principal
place of business in Newport Beach, California.
 
    C.  SANTA MONICA BANK.  Santa Monica Bank is a California corporation having
its principal place of business in Santa Monica, California.
 
    D.  STOCK OPTION AGREEMENT.  Concurrently herewith, BKLA and Western are
entering into a stock option agreement (the "STOCK OPTION AGREEMENT"), to be
dated the date hereof, whereby BKLA will grant to Western the option to purchase
up to 19.9% of the outstanding shares of the BKLA Common Stock upon the
occurrence of certain events.
 
    E.  INTENTIONS OF THE PARTIES.  It is the intention of the parties to this
Agreement that the business combination contemplated hereby be accounted for
under the "pooling-of-interests" accounting method and be treated as a
"reorganization" under Section 368 of the Internal Revenue Code of 1986 as
amended (the "CODE").
 
    F.  BOARD ACTION.  The respective Boards of Directors of each of Western and
BKLA have determined that it is in the best interests of their respective
companies and their stockholders to consummate the strategic business
combination transaction provided for herein.
 
    NOW, THEREFORE, in consideration of the premises and of the mutual
covenants, representations, warranties and agreements contained herein, the
parties agree as follows:
 
                                   ARTICLE I
 
                              CERTAIN DEFINITIONS
 
    1.01  CERTAIN DEFINITIONS.  The following terms are used in this Agreement
with the meanings set forth below:
 
        "ACQUISITION PROPOSAL" means any tender or exchange offer, proposal for
    a merger, consolidation or other business combination involving BKLA or any
    of its Subsidiaries or any proposal or offer to acquire in any manner a
    substantial equity interest in, or a substantial portion of the assets or
    deposits of, BKLA or any of its Subsidiaries, other than the transactions
    contemplated by this Agreement.
 
        "AFFILIATE AGREEMENTS" has the meaning set forth in Section 6.07(b).
 
        "AGREEMENT" means this Agreement, as amended or modified from time to
    time in accordance with Section 9.02.
 
        "BENEFIT PLANS" has the meaning set forth in Section 5.03(m).
 
        "BKLA" has the meaning set forth in the preamble to this Agreement.
 
        "BKLA AFFILIATE" has the meaning set forth in Section 6.07(a).
 
        "BKLA ARTICLES" means the Articles of Incorporation of BKLA.
 
        "BKLA BOARD" means the Board of Directors of BKLA.
 
        "BKLA BY-LAWS" means the By-laws of BKLA.
 
                                      A-1
<PAGE>
        "BKLA COMMON STOCK" means the common stock, no par value per share, of
    BKLA.
 
        "BKLA MEETING" has the meaning set forth in Section 6.02.
 
        "BKLA STOCK OPTION" has the meaning set forth in Section 3.06.
 
        "BKLA STOCK PLAN" means BKLA's 1988 Stock Option Plan (as amended).
 
        "BKLA WARRANT" has the meaning set forth in Section 3.07.
 
        "BKLA WARRANT AGREEMENT" has the meaning set forth in Section 3.07.
 
        "BUSINESS COMBINATION" has the meaning set forth in Section 3.05.
 
        "CGCL" means the California General Corporation law.
 
        "CALIFORNIA SECRETARY" means the California Secretary of State.
 
        "CODE" has the meaning set forth in the recitals.
 
        "COMMISSIONER" means the California Commissioner of Financial
    Institutions.
 
        "COSTS" has the meaning set forth in Section 6.12(a).
 
        "DISCLOSURE SCHEDULE" has the meaning set forth in Section 5.01.
 
        "EFFECTIVE DATE" means the date on which the Effective Time occurs, as
    provided for in Section 2.02.
 
        "EFFECTIVE TIME" means the effective time of the Merger, as provided for
    in Section 2.02.
 
        "EMPLOYEES" has the meaning set forth in Section 5.03(m).
 
        "ENVIRONMENTAL LAW" has the meaning set forth in Section 5.03(o).
 
        "ERISA" means the Employee Retirement Income Security Act of 1974, as
    amended.
 
        "ERISA AFFILIATE" has the meaning set forth in Section 5.03(m).
 
        "EXCHANGE ACT" means the Securities Exchange Act of 1934, as amended,
    and the rules and regulations thereunder.
 
        "EXCHANGE AGENT" has the meaning set forth in Section 3.04.
 
        "EXCHANGE FUND" has the meaning set forth in Section 3.04.
 
        "EXCHANGE RATIO" has the meaning set forth in Section 3.01(a).
 
        "FDIC" means the Federal Deposit Insurance Corporation.
 
        "FEDERAL RESERVE" means the Board of Governors of the Federal Reserve
    System.
 
        "GOVERNMENTAL AUTHORITY" means any court, administrative agency or
    commission or other federal, state or local governmental authority or
    instrumentality, or any Regulatory Authority.
 
        "HAZARDOUS SUBSTANCE" has the meaning set forth in Section 5.03(o).
 
        "INDEMNIFIED PARTY" has the meaning set forth in Section 6.12(a).
 
        "INSURANCE POLICY" has the meaning set forth in Section 5.03(s).
 
        "LIENS" means any charge, mortgage, pledge, security interest,
    restriction, claim, lien or encumbrance.
 
        "LOAN PROPERTY" has the meaning set forth in Subsection 5.03(o).
 
                                      A-2
<PAGE>
        "MATERIAL ADVERSE EFFECT" means, with respect to Western or BKLA, any
    effect that (i) is material and adverse to the financial position, results
    of operations or business of Western and its Subsidiaries taken as a whole
    or BKLA and its Subsidiaries taken as a whole, respectively, or (ii) would
    materially impair the ability of either Western or BKLA to perform its
    obligations under this Agreement or otherwise materially threaten or
    materially impede the consummation of the Merger and the other transactions
    contemplated by this Agreement; PROVIDED, HOWEVER, that Material Adverse
    Effect shall not be deemed to include the impact of (a) changes in banking
    and similar laws of general applicability or interpretations thereof by
    courts or governmental authorities, (b) changes in generally accepted
    accounting principles or regulatory accounting requirements applicable to
    banks and their holding companies generally and (c) any modifications or
    changes to valuation policies and practices in connection with the Merger or
    restructuring charges taken in connection with the Merger, in each case in
    accordance with generally accepted accounting principles.
 
        "MAXIMUM AMOUNT" has the meaning set forth in Section 6.12(c).
 
        "MERGER" has the meaning set forth in Section 2.01.
 
        "MERGER CONSIDERATION" has the meaning set forth in Section 2.01.
 
        "MULTIEMPLOYER PLANS" has the meaning set forth in Section 5.03(m).
 
        "NASDAQ" means The Nasdaq Stock Market, Inc.'s National Market.
 
        "NEW CERTIFICATE" has the meaning set forth in Section 3.04.
 
        "OLD CERTIFICATE" has the meaning set forth in Section 3.04.
 
        "PERSON" means any individual, bank, corporation, partnership,
    association, joint-stock company, business trust or unincorporated
    organization.
 
        "PENSION PLAN" has the meaning set forth in Section 5.03(m).
 
        "PLANS" has the meaning set forth in Section 5.03(m).
 
        "PREVIOUSLY DISCLOSED" by a party shall mean information set forth in
    its Disclosure Schedule.
 
        "PROXY STATEMENT" has the meaning set forth in Section 6.03.
 
        "REGISTRATION STATEMENT" has the meaning set forth in Section 6.03.
 
        "REGULATORY AUTHORITY" has the meaning set forth in Section 5.03(i).
 
        "REGULATORY DOCUMENTS" means documents filed with the SEC or the FDIC,
    as applicable, of the types referred to in Section 5.03(g) and Section
    5.04(f).
 
        "REPLACEMENT WARRANT" has the meaning set forth in Section 3.07.
 
        "REPRESENTATIVES" means, with respect to any Person, such Person's
    directors, officers, employees, legal or financial advisors or any
    representatives of such legal or financial advisors.
 
        "RIGHTS" means, with respect to any Person, securities or obligations
    convertible into or exercisable or exchangeable for, or giving any person
    any right to subscribe for or acquire, or any options, calls or commitments
    relating to, or any stock appreciation right or other instrument the value
    of which is determined in whole or in part by reference to the market price
    or value of, shares of capital stock of such Person.
 
        "SEC" means the Securities and Exchange Commission.
 
        "SECURITIES ACT" means the Securities Act of 1933, as amended, and rules
    and regulations thereunder.
 
                                      A-3
<PAGE>
        "SHAREHOLDER AGREEMENTS" has the meaning set forth in Section 6.16.
 
        "STOCK OPTION AGREEMENT" has the meaning set forth in the Recitals.
 
        "SUBSIDIARY" and "SIGNIFICANT SUBSIDIARY" have the meanings ascribed to
    them in Rule 1-02 of Regulation S-X of the SEC.
 
        "SURVIVING CORPORATION" has the meaning set forth in Section 2.01.
 
        "TAKEOVER LAWS" means any "moratorium", "control share", "fair price",
    "affiliate transaction", "business combination" or other antitakeover laws
    and regulations of the state of California.
 
        "TAX" and "TAXES" means all federal, state, local or foreign taxes,
    charges, fees, levies or other assessments, however denominated, including,
    without limitation, all net income, gross income, gains, gross receipts,
    sales, use, ad valorem, goods and services, capital, production, transfer,
    franchise, windfall profits, license, withholding, payroll, employment,
    disability, employer health, excise, estimated, severance, stamp,
    occupation, property, environmental, unemployment or other taxes, custom
    duties, fees, assessments or charges of any kind whatsoever, together with
    any interest and any penalties, additions to tax or additional amounts
    imposed by any taxing authority whether arising before, on or after the
    Effective Date.
 
        "TAX RETURNS" means any return, amended return or other report
    (including elections, declarations, disclosures, schedules, estimates and
    information returns) required to be filed with respect to any Tax.
 
        "TREASURY STOCK" shall mean shares of BKLA Common Stock held by any of
    BKLA's Subsidiaries or by Western or any of its Subsidiaries, in each case
    other than in a fiduciary (including custodial or agency) capacity or as a
    result of debts previously contracted in good faith.
 
        "WESTERN" has the meaning set forth in the preamble to this Agreement.
 
        "WESTERN BOARD" means the Board of Directors of Western.
 
        "WESTERN COMMON STOCK" means the common stock, no par value per share,
    of Western.
 
        "WESTERN PREFERRED STOCK" means the preferred, no par or stated value
    per share, of Western.
 
                                   ARTICLE II
 
                                   THE MERGER
 
    2.01  THE MERGER.  (a) At the Effective Time, BKLA shall merge with and into
Santa Monica Bank (the "Merger"), the separate corporate existence of BKLA shall
cease and Santa Monica Bank shall survive and continue to exist as a California
corporation (Santa Monica Bank, as the surviving corporation in the Merger,
sometimes being referred to herein as the "SURVIVING CORPORATION"). Western may
at any time prior to the Effective Time change the method of effecting the
combination with BKLA (including, without limitation, the provisions of this
Article II) if and to the extent it deems such change to be necessary,
appropriate or desirable; PROVIDED, HOWEVER, that no such change shall (i) alter
or change the amount or kind of consideration to be issued to holders of BKLA
Common Stock as provided for in this Agreement (the "MERGER CONSIDERATION"),
(ii) cause the transaction to be treated as anything other than a tax-free
reorganization to the shareholders of BKLA or (iii) materially impede or delay
consummation of the transactions contemplated by this Agreement.
 
   
    (b) Subject to the satisfaction or waiver of the conditions set forth in
Article VII, the Merger shall become effective upon the occurrence of the filing
in the office of the Commissioner in accordance with the California Financial
Code after the filing with the California Secretary of an agreement of merger in
accordance with the CGCL or such later date and time as may be set forth in such
agreement. The Merger shall have the effects prescribed in the CGCL.
    
 
                                      A-4
<PAGE>
    (c) ARTICLES OF INCORPORATION AND BY-LAWS. The articles of incorporation and
by-laws of Santa Monica Bank immediately after the Merger shall be those of
Santa Monica Bank as in effect immediately prior to the Effective Time.
 
    (d) DIRECTORS AND OFFICERS OF THE SURVIVING CORPORATION. The directors and
officers of Santa Monica Bank immediately after the Merger shall be the
directors and officers of Santa Monica Bank immediately prior to the Effective
Time, until such time as their successors shall be duly elected and qualified.
 
    (e) DIRECTORS AND OFFICERS OF WESTERN. The directors and officers of Western
immediately after the Merger shall be the directors and officers of Western
immediately prior to the Effective Time, until such time as their successors
shall be duly elected and qualified. Notwithstanding the foregoing, at the
Effective Time a director of BKLA's election to be mutually agreed upon prior to
the date of the initial filing of any application with a Regulatory Authority
shall be appointed to the board of directors of Western.
 
    2.02  EFFECTIVE DATE AND EFFECTIVE TIME.  On such date as Western selects
(and promptly provides notice thereof to BKLA), which shall be within ten days
after the last to occur of the expiration of all applicable waiting periods in
connection with approvals of governmental authorities and the receipt of all
approvals of governmental authorities and all conditions to the consummation of
the Merger are satisfied or waived (or, at the election of Western, on the last
business day of the month in which such tenth day occurs or, if such tenth day
occurs on one of the last five business days of such month, on the last business
day of the succeeding month), or on such earlier or later date as may be agreed
in writing by the parties, an agreement of merger shall be executed in
accordance with all appropriate legal requirements and shall be filed as
required by law, and the Merger provided for herein shall become effective upon
such filing or on such date as may be specified in such agreement of merger. The
date of such filing or such later effective date is herein called the "EFFECTIVE
DATE." The "EFFECTIVE TIME" of the Merger shall be the time of such filing or as
set forth in such agreement of merger.
 
                                  ARTICLE III
 
                       CONSIDERATION; EXCHANGE PROCEDURES
 
    3.01  MERGER CONSIDERATION.  Subject to the provisions of this Agreement, at
the Effective Time, automatically by virtue of the Merger and without any action
on the part of any Person:
 
        (a) OUTSTANDING BKLA COMMON STOCK. Each share, excluding Treasury Stock,
    of BKLA Common Stock issued and outstanding immediately prior to the
    Effective Time shall become and be converted into 0.4224 of a share of
    Western Common Stock (the "EXCHANGE RATIO"). The Exchange Ratio shall be
    subject to adjustment as set forth in Section 3.05.
 
        (b) OUTSTANDING WESTERN COMMON STOCK. Each share of Western Common Stock
    and each share of Santa Monica Bank Common Stock, in each case as issued and
    outstanding immediately prior to the Effective Time, shall remain issued and
    outstanding and unaffected by the Merger.
 
        (c) TREASURY SHARES. Each share of BKLA Common Stock held as Treasury
    Stock immediately prior to the Effective Time shall be canceled and retired
    at the Effective Time and no consideration shall be issued in exchange
    therefor.
 
        (d) DISSENTING SHAREHOLDERS. Any shares of BKLA Common Stock held by
    persons who have satisfied the requirements of Chapter 13 of the California
    General Corporation Law ("Chapter 13"), and have not effectively withdrawn
    or lost their dissenters' rights under Section 1309 of the California
    General Corporation Law, shall not be converted pursuant to Section 3.01(a),
    but the holders thereof shall be entitled only to such consideration
    determined pursuant to Chapter 13.
 
    3.02  RIGHTS AS SHAREHOLDERS; STOCK TRANSFERS.  At the Effective Time,
holders of BKLA Common Stock shall cease to be, and shall have no rights as,
shareholders of BKLA (except as provided for in Section 3.01(d)), other than to
receive any dividend or other distribution with respect to such BKLA
 
                                      A-5
<PAGE>
Common Stock with a record date occurring prior to the Effective Time and the
consideration provided under this Article III. After the Effective Time, there
shall be no transfers on the stock transfer books of BKLA or the Surviving
Corporation of shares of BKLA Common Stock.
 
    3.03  FRACTIONAL SHARES.  Notwithstanding any other provision hereof, no
fractional shares of Western Common Stock and no certificates or scrip therefor,
or other evidence of ownership thereof, will be issued in the Merger; instead,
Western shall pay to each holder of BKLA Common Stock who would otherwise be
entitled to a fractional share of Western Common Stock (after taking into
account all Old Certificates delivered by such holder) an amount in cash
(without interest) determined by multiplying such fraction by the average of the
closing prices of Western Common Stock, as reported on NASDAQ (as reported in
THE WALL STREET JOURNAL or, if not reported therein, in another authoritative
source), for the five NASDAQ trading days immediately preceding the Effective
Date.
 
    3.04  EXCHANGE PROCEDURES.  (a) At or prior to the Effective Time, Western
shall deposit, or shall cause to be deposited, with U.S. Stock Transfer or with
such other unaffiliated exchange agent as Western shall reasonably elect (in
such capacity, the "EXCHANGE AGENT"), for the benefit of the holders of
certificates formerly representing shares of BKLA Common Stock ("OLD
CERTIFICATES"), for exchange in accordance with this Article III, certificates
representing the shares of Western Common Stock ("NEW CERTIFICATES") and an
estimated amount of cash (such cash and New Certificates, together with any
dividends or distributions with a record date occurring after the Effective Date
with respect to the New Certificates (without any interest on any such cash,
dividends or distributions), being hereinafter referred to as the "EXCHANGE
FUND") to be paid pursuant to this Article III in exchange for outstanding
shares of BKLA Common Stock.
 
    (b) As soon as practicable, but no later than five (5) business days after
the Effective Date, Western shall send or cause to be sent to each former holder
of record of shares of BKLA Common Stock immediately prior to the Effective Time
transmittal materials for use in exchanging such stockholder's Old Certificates
for the consideration set forth in this Article III. Western shall cause the New
Certificates into which shares of a shareholder's BKLA Common Stock are
converted on the Effective Date and/or any check in respect of any fractional
share interests or dividends or distributions which such person shall be
entitled to receive to be delivered to such shareholder upon delivery to the
Exchange Agent of Old Certificates representing such shares of BKLA Common Stock
(or an affidavit of lost certificate and, if required by the Exchange Agent,
indemnity reasonably satisfactory to Western and the Exchange Agent, if any of
such certificates are lost, stolen or destroyed) owned by such shareholder. No
interest will be paid on any such cash to be paid in lieu of fractional share
interests or in respect of dividends or distributions which any such person
shall be entitled to receive pursuant to this Article III upon such delivery. In
the event of a transfer of ownership of any shares of BKLA Common Stock not
registered in the transfer records of BKLA, the exchange described in this
Section 3.04(b) may nonetheless be effected and a check for the cash to be paid
in lieu of fractional shares may be issued to the transferee if the Old
Certificate representing such BKLA Common Stock is presented to the Exchange
Agent, accompanied by documents sufficient, in the discretion of Western and the
Exchange Agent, (i) to evidence and effect such transfer but for the provisions
of Section 3.02 hereof and (ii) to evidence that all applicable stock transfer
taxes have been paid.
 
    (c) If Old Certificates are not surrendered or the consideration therefor is
not claimed prior to the date on which such consideration would otherwise
escheat to or become the property of any governmental unit or agency, the
unclaimed consideration shall, to the extent permitted by abandoned property and
any other applicable law, become the property of the Surviving Corporation (and
to the extent not in its possession shall be paid over to the Surviving
Corporation), free and clear of all claims or interest of any person previously
entitled to such claims. Notwithstanding the foregoing, neither the Exchange
Agent nor any party hereto shall be liable to any former holder of BKLA Common
Stock for any amount properly delivered to a public official pursuant to
applicable abandoned property, escheat or similar laws.
 
                                      A-6
<PAGE>
    (d) At the election of Western, no dividends or other distributions with
respect to Western Common Stock with a record date occurring after the Effective
Time shall be paid to the holder of any unsurrendered Old Certificate
representing shares of BKLA Common Stock converted in the Merger into the right
to receive shares of such Western Common Stock until the holder thereof shall be
entitled to receive New Certificates in exchange therefor in accordance with the
procedures set forth in this Section 3.04, and no such shares of BKLA Common
Stock shall be eligible to vote until the holder of Old Certificates is entitled
to receive New Certificates in accordance with the procedures set forth in this
Section 3.04. After becoming so entitled in accordance with this Section 3.04,
the record holder thereof also shall be entitled to receive any such dividends
or other distributions, without any interest thereon, which theretofore had
become payable with respect to shares of Western Common Stock such holder had
the right to receive upon surrender of the Old Certificate.
 
    (e) Any portion of the Exchange Fund that remains unclaimed by the
shareholders of BKLA for six months after the Effective Time shall be returned
by the Exchange Agent to Western at the election of Western. Any shareholders of
BKLA who have not theretofore complied with this Article III shall thereafter
look only to Western for payment of the shares of Western Common Stock, cash in
lieu of any fractional shares and unpaid dividends and distributions on Western
Common Stock deliverable in respect of each share of BKLA Common Stock such
shareholder holds as determined pursuant to this Agreement, in each case,
without any interest thereon.
 
    3.05  ANTI-DILUTION PROVISIONS.  In the event Western changes (or
establishes a record date for changing) the number of shares of Western Common
Stock issued and outstanding prior to the Effective Date as a result of a stock
split, stock dividend, recapitalization or similar transaction with respect to
the outstanding Western Common Stock and the record date therefor shall be prior
to the Effective Date, the Exchange Ratio shall be proportionately adjusted. If,
between the date hereof and the Effective Time, Western shall consolidate with
or into any other corporation (a "BUSINESS COMBINATION") and the terms thereof
shall provide that Western Common Stock shall be converted into or exchanged for
the shares of any other corporation or entity, then provision shall be made as
part of the terms of such Business Combination so that (i) shareholders of BKLA
who would be entitled to receive shares of Western Common Stock pursuant to this
Agreement shall be entitled to receive, in lieu of each share of Western Common
Stock issuable to such shareholders as provided herein, the same kind and amount
of securities or assets as shall be distributable upon such Business Combination
with respect to one share of Western Common Stock.
 
    3.06  OPTIONS.  At the Effective Time, all outstanding options to purchase
shares of BKLA Common Stock under the BKLA Stock Plan (each, a "BKLA STOCK
OPTION"), unless otherwise exercised pursuant to Section 10 of the BKLA Stock
Plan, shall be converted into the right to receive for each share of BKLA Common
Stock otherwise issuable upon exercise thereof a number of shares of Western
Common Stock equal to the quotient obtained by dividing the Spread by $42.61
("Replacement Shares"). As used herein, "Spread" means the difference, if
positive, obtained by subtracting the exercise price of such BKLA Stock Option
from $18.00. After accumulating all such Replacement Shares issuable to any
holder of BKLA Stock Options, any fractional Replacement Shares issuable to any
holder of BKLA Stock Options of .2 or above shall be rounded upwards. Each
person who is a BKLA Affiliate as described in Section 6.07 hereby consents that
the Replacement Shares and/or Western Common Stock to be received by such person
on exercise of such persons BKLA Stock Option (collectively, the "Escrow
Shares"), as applicable, shall be placed, at Western's sole discretion, in an
escrow account until such time as the sale of such shares shall be permitted
pursuant to the Affiliate Agreement and applicable securities laws, at which
time the appropriate number of shares of Western Common Stock necessary to
satisfy any withholding tax obligation shall be sold, unless provided for
otherwise by such BKLA Affiliate, and applied to payment of such obligation,
with the balance of the shares of Western Common Stock of such BKLA Affiliate
transferred promptly to such BKLA Affiliate. Notwithstanding the foregoing, each
BKLA Affiliate shall have any and all rights to any dividends and voting rights
applicable to such BKLA Affiliate's Escrow Shares.
 
                                      A-7
<PAGE>
    3.07  WARRANTS.  At the Effective Time, each outstanding warrant to purchase
shares of BKLA Common Stock under the BKLA Warrant Agreement (each, a "BKLA
WARRANT"), shall be converted into a warrant to acquire, on the same terms and
conditions as were applicable under such BKLA Warrant Agreement, the number of
shares of Western Common Stock equal to (a) the number of shares of BKLA Common
Stock subject to the BKLA Warrant, multiplied by (b) the Exchange Ratio (such
product rounded down to the nearest whole number) (a "REPLACEMENT WARRANT"), at
an exercise price per share (rounded up to the nearest whole cent) equal to (y)
the aggregate exercise price for the shares of BKLA Common Stock which were
purchasable pursuant to such BKLA Warrant divided by (z) the number of full
shares of Western Common Stock subject to such Replacement Warrant in accordance
with the foregoing. At or prior to the Effective Time, BKLA shall take all
action, if any, necessary with respect to the BKLA Warrant Agreement to permit
the replacement of the outstanding BKLA Warrants by Western pursuant to this
Section 3.07. At the Effective Time, Western shall assume the BKLA Warrant
Agreement; PROVIDED, that such assumption shall be only in respect of the
Replacement Warrants and that Western shall have no obligation with respect to
any awards under the BKLA Warrant Agreement other than the Replacement Warrants
and shall have no obligation to make any additional grants or awards under such
assumed BKLA Warrant Agreement.
 
                                   ARTICLE IV
 
                          ACTIONS PENDING ACQUISITION
 
    4.01  FOREBEARANCES OF BKLA.  From the date hereof until the Effective Time,
except as expressly contemplated by this Agreement, without the prior written
consent of Western, BKLA will not, and will cause each of its Subsidiaries not
to:
 
        (a)  ORDINARY COURSE.  Conduct the business of BKLA and its Subsidiaries
    other than in the ordinary and usual course or fail to use reasonable best
    efforts to preserve intact their business organizations and assets and
    maintain their rights, franchises and existing relations with customers,
    suppliers, employees and business associates, take any action that would
    adversely affect or delay the ability of BKLA, Western or any of their
    Subsidiaries to perform any of their obligations on a timely basis under
    this Agreement, or take any action that is reasonably likely to have a
    Material Adverse Effect on BKLA or its Subsidiaries, taken as a whole.
 
        (b)  CAPITAL STOCK.  Other than pursuant to Rights Previously Disclosed
    and outstanding on the date hereof, (i) issue, sell or otherwise permit to
    become outstanding, or authorize the creation of, any additional shares of
    BKLA Common Stock or any Rights or issue any shares of preferred stock, (ii)
    enter into any agreement with respect to the foregoing or (iii) permit any
    additional shares of BKLA Common Stock to become subject to new grants of
    employee or director stock options, other Rights or similar stock-based
    employee rights.
 
        (c)  DIVIDENDS, ETC.  (a) Make, declare, pay or set aside for payment
    any dividend on or in respect of, or declare or make any distribution on any
    shares of BKLA Common Stock or (b) directly or indirectly adjust, split,
    combine, redeem, reclassify, purchase or otherwise acquire, any shares of
    its capital stock.
 
        (d)  COMPENSATION; EMPLOYMENT AGREEMENTS; ETC.  Enter into or amend or
    renew any employment, consulting, severance or similar agreements or
    arrangements with any director, officer or employee of BKLA or its
    Subsidiaries, or grant any salary or wage increase or increase any employee
    benefit (including incentive or bonus payments), except (i) for normal
    individual increases in compensation to employees in the ordinary course of
    business consistent with past practice, (ii) for other changes that are
    required by applicable law, (iii) to satisfy Previously Disclosed
    contractual obligations existing as of the date hereof or (iv) for grants of
    awards to newly hired employees consistent with past practice.
 
                                      A-8
<PAGE>
        (e)  BENEFIT PLANS.  Enter into, establish, adopt or amend (except (i)
    as may be required by applicable law or (ii) to satisfy Previously Disclosed
    contractual obligations existing as of the date hereof) any pension,
    retirement, stock option, stock purchase, savings, profit sharing, deferred
    compensation, consulting, bonus, group insurance or other employee benefit,
    incentive or welfare contract, plan or arrangement, or any trust agreement
    (or similar arrangement) related thereto, in respect of any director,
    officer or employee of BKLA or its Subsidiaries, or take any action to
    accelerate the vesting or exercisability of stock options, restricted stock
    or other compensation or benefits payable thereunder.
 
        (f)  DISPOSITIONS.  Except as Previously Disclosed, sell, transfer,
    mortgage, encumber or otherwise dispose of or discontinue any of its assets,
    deposits, business or properties except in the ordinary course of business
    and in a transaction that is not material to it and its Subsidiaries taken
    as a whole.
 
        (g)  ACQUISITIONS.  Except as Previously Disclosed, acquire (other than
    by way of foreclosures or acquisitions of control in a bona fide fiduciary
    capacity or in satisfaction of debts previously contracted in good faith, in
    each case in the ordinary and usual course of business consistent with past
    practice) all or any portion of, the assets, business, deposits or
    properties of any other entity except in the ordinary course of business
    consistent with past practice and in a transaction that is not material to
    the BKLA and its Subsidiaries, taken as a whole.
 
        (h)  CAPITAL EXPENDITURES.  Except as Previously Disclosed, make any
    capital expenditures other than capital expenditures in the ordinary course
    of business consistent with past practice in amounts not exceeding $10,000
    individually or $50,000 in the aggregate.
 
        (i)  GOVERNING DOCUMENTS.  Amend the BKLA Articles, BKLA By-Laws or the
    articles of incorporation or by-laws (or similar governing documents) of any
    of BKLA's Subsidiaries.
 
        (j)  ACCOUNTING METHODS.  Implement or adopt any change in its
    accounting principles, practices or methods, other than as may be required
    by generally accepted accounting principles.
 
        (k)  CONTRACTS.  Except in the ordinary course of business consistent
    with past practice, enter into or terminate any material contract (as
    defined in Section 5.03(k)) or amend or modify in any material respect any
    of its existing material contracts.
 
        (l)  CLAIMS.  Except in the ordinary course of business consistent with
    past practice, settle any claim, action or proceeding, except for any claim,
    action or proceeding involving solely money damages in an amount,
    individually or in the aggregate for all such settlements, that is not
    material to BKLA and its Subsidiaries, taken as a whole.
 
        (m)  ADVERSE ACTIONS.  (a) Take any action which BKLA either knows or
    reasonably should know that such action would, or would be reasonably likely
    to, prevent or impede the Merger from qualifying (i) for "pooling of
    interests" accounting treatment or (ii) as a reorganization within the
    meaning of Section 368 of the Code; or (b) knowingly take any action that is
    intended or is reasonably likely to result in (i) any of its representations
    and warranties set forth in this Agreement being or becoming untrue in any
    material respect at any time at or prior to the Effective Time, (ii) any of
    the conditions to the Merger set forth in Article VII not being satisfied or
    (iii) a violation of any provision of this Agreement except, in each case,
    as may be required by applicable law or regulation.
 
        (n)  RISK MANAGEMENT.  Except as required by applicable law or
    regulation, (i) implement or adopt any material change in its interest rate
    and other risk management policies, procedures or practices; (ii) fail to
    follow its existing policies or practices with respect to managing its
    exposure to interest rate and other risk; or (iii) fail to use commercially
    reasonable means to avoid any material increase in its aggregate exposure to
    interest rate risk.
 
        (o)  INDEBTEDNESS.  Incur any indebtedness for borrowed money other than
    in the ordinary course of business consistent with past practice.
 
                                      A-9
<PAGE>
        (p)  LOANS.  Make any loan, loan commitment or renewal or extension
    thereof to any person which would, when aggregated with all outstanding
    loans, commitments for loans or renewals or extensions thereof made by BKLA
    to such person and any affiliate or immediate family member of such person,
    exceed $500,000 without submitting loan package information to the chief
    credit officer of Western for review with a right of comment at least one
    full business day prior to taking such action.
 
        (q)  COMMITMENTS.  Agree or commit to do any of the foregoing.
 
    4.02  FOREBEARANCES OF WESTERN.  From the date hereof until the Effective
Time, except as expressly contemplated by this Agreement, without the prior
written consent of BKLA, Western will not, and will cause each of its
Subsidiaries not to:
 
        (a)  ORDINARY COURSE.  Take any action that would adversely affect or
    delay the ability of BKLA or Western to perform any of their obligations on
    a timely basis under this Agreement, or take any action that is reasonably
    likely to have a Material Adverse Effect on Western or its Subsidiaries,
    taken as a whole.
 
        (b)  ADVERSE ACTIONS.  (i) Take any action which Western either knows or
    reasonably should know that such action would, or would be reasonably likely
    to, prevent or impede the Merger from qualifying (A) for "pooling of
    interests" accounting treatment or (B) as a reorganization within the
    meaning of Section 368 of the Code; or (ii) knowingly take any action that
    is intended or is reasonably likely to result in (A) any of its
    representations and warranties set forth in this Agreement being or becoming
    untrue in any material respect at any time at or prior to the Effective
    Time, (B) any of the conditions to the Merger set forth in Article VII not
    being satisfied or (C) a violation of any provision of this Agreement
    except, in each case, as may be required by applicable law or regulation.
 
                                   ARTICLE V
 
                         REPRESENTATIONS AND WARRANTIES
 
    5.01  DISCLOSURE SCHEDULES.  On or prior to the date hereof, each of BKLA
and Western has delivered to the other a schedule (a "DISCLOSURE SCHEDULE")
setting forth, among other things, items the disclosure of which is necessary or
appropriate either in response to an express disclosure requirement contained in
a provision hereof, or items which are an exception to one or more
representations or warranties contained in Section 5.03 or Section 5.04;
PROVIDED, that (a) no such item is required to be set forth in a Disclosure
Schedule as an exception to a representation or warranty if its absence would
not be reasonably likely to result in the related representation or warranty
being deemed untrue or incorrect under the standard established by Section 5.02,
and (b) the mere inclusion of an item in a Disclosure Schedule as an exception
to a representation or warranty shall not be deemed an admission by a party that
such item represents a material exception or fact, event or circumstance or that
such item is reasonably likely to result in a Material Adverse Effect.
 
    5.02  STANDARD.  No representation or warranty of BKLA, Western or Santa
Monica Bank contained in Section 5.03 or 5.04 shall be deemed untrue or
incorrect, and no party hereto shall be deemed to have breached a representation
or warranty, as a consequence of the existence of any fact, event or
circumstance unless such fact, circumstance or event, individually or taken
together with all other facts, events or circumstances inconsistent with any
representation or warranty contained in Section 5.03 or 5.04 has had or is
reasonably likely to have a Material Adverse Effect on the party making such
representation or warranty.
 
                                      A-10
<PAGE>
    5.03  REPRESENTATIONS AND WARRANTIES OF BKLA.  Subject to Sections 5.01 and
5.02 and except as Previously Disclosed in its Disclosure Schedule corresponding
to the relevant paragraph below, BKLA hereby represents and warrants to Western:
 
        (a)  ORGANIZATION, STANDING AND AUTHORITY.  BKLA is a corporation duly
    organized, validly existing and in good standing under the laws of the State
    of California. BKLA is duly qualified to do business and is in good standing
    in the State of California and any foreign jurisdictions where its ownership
    or leasing of property or assets or the conduct of its business requires it
    to be so qualified. BKLA is duly licensed by the Commissioner as a
    commercial bank and its deposits are insured by the FDIC through the Bank
    Insurance Fund in the manner and to the fullest extent provided by law.
 
        (b)  BKLA CAPITAL STOCK.  As of the date hereof, the authorized capital
    stock of BKLA consists solely of (i) 75,000,000 shares of BKLA Common Stock,
    of which no more than 4,762,100 shares were outstanding as of the date
    hereof and (ii) 25,000,000 shares of preferred stock, of which no shares
    were outstanding as of the date hereof. As of the date hereof, no shares of
    BKLA Common Stock were held in treasury by BKLA or otherwise owned by BKLA
    or its Subsidiaries. The outstanding shares of BKLA Common Stock have been
    duly authorized and are validly issued and outstanding, fully paid and
    nonassessable, and subject to no preemptive rights (and were not issued in
    violation of any preemptive rights). As of the date hereof, there are no
    shares of BKLA Common Stock authorized and reserved for issuance, BKLA does
    not have any Rights issued or outstanding with respect to BKLA Common Stock,
    and BKLA does not have any commitment to authorize, issue or sell any BKLA
    Common Stock or Rights, except pursuant to this Agreement, any BKLA Stock
    Option, the BKLA Stock Plan, any BKLA Warrant and the BKLA Warrant
    Agreement. The number of shares of BKLA Common Stock which are issuable and
    reserved for issuance upon exercise of BKLA Stock Options as of the date
    hereof are Previously Disclosed in BKLA's Disclosure Schedule. The number of
    shares of BKLA Common Stock which are issuable and reserved for issuance
    upon exercise of BKLA Warrants as of the date hereof are Previously
    Disclosed in BKLA's Disclosure Schedule.
 
        (c)  SUBSIDIARIES.  (i)(A) BKLA has Previously Disclosed a list of all
    of its Subsidiaries together with the jurisdiction of organization of each
    such Subsidiary, (B) BKLA owns, directly or indirectly, all the issued and
    outstanding equity securities of each of its Subsidiaries, (C) no equity
    securities of any of its Subsidiaries are or may become required to be
    issued (other than to it or its wholly-owned Subsidiaries) by reason of any
    Right or otherwise, (D) there are no contracts, commitments, understandings
    or arrangements by which any of such Subsidiaries is or may be bound to sell
    or otherwise transfer any equity securities of any such Subsidiaries (other
    than to it or its wholly-owned Subsidiaries), (E) there are no contracts,
    commitments, understandings, or arrangements relating to its rights to vote
    or to dispose of such securities and (F) all the equity securities of each
    Subsidiary held by BKLA or its Subsidiaries are fully paid and nonassessable
    and are owned by BKLA or its Subsidiaries free and clear of any Liens.
 
        (ii) BKLA does not own beneficially, directly or indirectly, any equity
    securities or similar interests of any Person, or any interest in a
    partnership or joint venture of any kind, other than its Subsidiaries.
 
       (iii) Each of BKLA's Subsidiaries has been duly organized and is validly
    existing in good standing under the laws of the jurisdiction of its
    organization, and is duly qualified to do business and in good standing in
    the jurisdictions where its ownership or leasing of property or the conduct
    of its business requires it to be so qualified.
 
        (d)  CORPORATE POWER.  BKLA and each of its Subsidiaries has the
    corporate power and authority to carry on its business as it is now being
    conducted and to own all its properties and assets; and BKLA has the
    corporate power and authority to execute, deliver and perform its
    obligations under this Agreement and the Stock Option Agreement and to
    consummate the transactions contemplated hereby and thereby.
 
                                      A-11
<PAGE>
        (e)  CORPORATE AUTHORITY.  Subject in the case of this Agreement to
    receipt of the requisite approval of the principal terms of the agreement of
    merger set forth in this Agreement by the holders of a majority of the
    outstanding shares of BKLA Common Stock entitled to vote thereon (which is
    the only shareholder vote required thereon), this Agreement, the Stock
    Option Agreement and the transactions contemplated hereby and thereby have
    been authorized by all necessary corporate action of BKLA and the BKLA Board
    on or prior to the date hereof. This Agreement is a valid and legally
    binding obligation of BKLA, enforceable in accordance with its terms (except
    as enforceability may be limited by applicable bankruptcy, insolvency,
    reorganization, moratorium, fraudulent transfer and similar laws of general
    applicability relating to or affecting creditors' rights or by general
    equity principles). The BKLA Board has received the written opinion of
    Wedbush Morgan Securities to the effect that as of the date hereof the
    consideration to be received by the holders of BKLA Common Stock in the
    Merger is fair to the holders of BKLA Common Stock from a financial point of
    view.
 
        (f)  REGULATORY APPROVALS; NO DEFAULTS.  (i) No consents or approvals
    of, or filings or registrations with, any Governmental Authority or with any
    third party are required to be made or obtained by BKLA or any of its
    Subsidiaries in connection with the execution, delivery or performance by
    BKLA of this Agreement, the Stock Option Agreement, the BKLA Warrant
    Agreement, or to consummate the Merger except for (A) filings of
    applications or notices with the Commissioner, the FDIC and the Federal
    Reserve, as required, (B) filings with the SEC and state securities
    authorities and the approval of this Agreement by the shareholders of BKLA,
    (C) the filing of an agreement of merger with the California Secretary
    pursuant to the CGCL and with the Commissioner pursuant to the California
    Financial Code. As of the date hereof, BKLA is not aware of any reason why
    the approvals set forth in Section 7.01(b) will not be received without the
    imposition of a condition, restriction or requirement of the type described
    in Section 7.01(b).
 
        (ii) Subject to receipt of the approvals referred to in the preceding
    paragraph, and the expiration of related waiting periods, and required
    filings under federal and state securities laws, the execution, delivery and
    performance of this Agreement and the Stock Option Agreement and the
    consummation of the transactions contemplated hereby and thereby do not and
    will not (A) constitute a breach or violation of, or a default under, or
    give rise to any Lien, any acceleration of remedies or any right of
    termination under, any law, rule or regulation or any judgment, decree,
    order, governmental permit or license, or agreement, indenture or instrument
    of BKLA or of any of its Subsidiaries or to which BKLA or any of its
    Subsidiaries or properties is subject or bound, (B) constitute a breach or
    violation of, or a default under, the BKLA Articles or the BKLA By-Laws, or
    (C) require any consent or approval under any such law, rule, regulation,
    judgment, decree, order, governmental permit or license, agreement,
    indenture or instrument.
 
        (g)  FINANCIAL REPORTS AND REGULATORY DOCUMENTS.  (i) BKLA's (or its
    predecessors') Annual Reports on Form 10-K for the fiscal years ended
    December 31, 1995, 1996 and 1997, and all other reports, registration
    statements, definitive proxy statements or information statements filed or
    to be filed by it or any of its Subsidiaries subsequent to December 31, 1995
    under the Securities Act, or under Section 13(a), 13(c), 14 or 15(d) of the
    Exchange Act or under the securities regulations of the FDIC, in the form
    filed or to be filed (collectively, BKLA's "REGULATORY DOCUMENTS") with the
    FDIC as of the date filed, (A) complied or will comply in all material
    respects as to form with the applicable requirements under the Securities
    Act, the Exchange Act or the securities regulations of the FDIC, as the case
    may be, and (B) did not and will not contain any untrue statement of a
    material fact or omit to state a material fact required to be stated therein
    or necessary to make the statements therein, in the light of the
    circumstances under which they were made, not misleading; and each of the
    balance sheets contained in or incorporated by reference into any such
    Regulatory Document (including the related notes and schedules thereto)
    fairly presents, or will fairly present, the financial position of BKLA and
    its Subsidiaries as of its date, and each of the statements of income and
    changes in shareholders' equity and cash flows or equivalent statements in
    such Regulatory Documents (including any related notes and schedules
    thereto) fairly presents, or will fairly present, the results of
 
                                      A-12
<PAGE>
    operations, changes in shareholders' equity and cash flows, as the case may
    be, of BKLA and its Subsidiaries for the periods to which they relate, in
    each case in accordance with generally accepted accounting principles
    consistently applied during the periods involved, except in each case as may
    be noted therein, subject to normal year-end audit adjustments in the case
    of unaudited statements.
 
        (ii) Since December 31, 1997, BKLA and its Subsidiaries have not
    incurred any liability other than in the ordinary course of business
    consistent with past practice.
 
       (iii) Since December 31, 1997, (A) BKLA and its Subsidiaries have
    conducted their respective businesses in the ordinary and usual course
    consistent with past practice (excluding the incurrence of expenses related
    to this Agreement and the transactions contemplated hereby) and (B) no event
    has occurred or circumstance arisen that, individually or taken together
    with all other facts, circumstances and events (described in any paragraph
    of this Section 5.03 or otherwise), is reasonably likely to have a Material
    Adverse Effect with respect to BKLA.
 
        (h)  LITIGATION.  No litigation, claim or other proceeding before any
    court or governmental agency is pending against BKLA or any of its
    Subsidiaries and, to BKLA's knowledge, no such litigation, claim or other
    proceeding has been threatened and there are no facts which could reasonably
    give rise to such litigation, claim or other proceeding.
 
        (i)  REGULATORY MATTERS.  (i) Neither BKLA nor any of its Subsidiaries
    or any of their properties is a party to or is subject to any order, decree,
    agreement, memorandum of understanding or similar arrangement with, or a
    commitment letter or similar submission to, or extraordinary supervisory
    letter from, any federal or state governmental agency or authority charged
    with the supervision or regulation of financial institutions or issuers of
    securities or engaged in the insurance of deposits (including, without
    limitation, the Commissioner and the FDIC) or the supervision or regulation
    of it or any of its Subsidiaries (collectively, the "REGULATORY
    AUTHORITIES").
 
        (ii) Neither BKLA nor any of its Subsidiaries has been advised by, nor
    has any knowledge of facts which could give rise to an advisory notice by,
    any Regulatory Authority that such Regulatory Authority is contemplating
    issuing or requesting (or is considering the appropriateness of issuing or
    requesting) any such order, decree, agreement, memorandum of understanding,
    commitment letter, supervisory letter or similar submission.
 
        (j)  COMPLIANCE WITH LAWS.  BKLA and each of its Subsidiaries:
 
            (i) is in compliance with all applicable federal, state, local and
       foreign statutes, laws, regulations, ordinances, rules, judgments, orders
       or decrees applicable thereto or to the employees conducting such
       businesses, including, without limitation, the Equal Credit Opportunity
       Act, the Fair Housing Act, the Community Reinvestment Act, the Home
       Mortgage Disclosure Act and all other applicable fair lending laws and
       other laws relating to discriminatory business practices;
 
            (ii) has all permits, licenses, authorizations, orders and approvals
       of, and has made all filings, applications and registrations with, all
       Governmental Authorities that are required in order to permit them to own
       or lease their properties and to conduct their businesses as presently
       conducted; all such permits, licenses, certificates of authority, orders
       and approvals are in full force and effect and, to BKLA's knowledge, no
       suspension or cancellation of any of them is threatened; and
 
           (iii) has received, since December 31, 1996, no notification or
       communication from any Governmental Authority (A) asserting that BKLA or
       any of its Subsidiaries is not in compliance with any of the statutes,
       regulations or ordinances which such Governmental Authority enforces or
       (B) threatening to revoke any license, franchise, permit or governmental
       authorization (nor, to BKLA's knowledge, do any grounds for any of the
       foregoing exist).
 
        (k)  MATERIAL CONTRACTS; DEFAULTS.  Except for those agreements and
    other documents filed as exhibits to its Regulatory Documents, neither it
    nor any of its Subsidiaries is a party to, bound by or
 
                                      A-13
<PAGE>
    subject to any agreement, contract, arrangement, commitment or understanding
    (whether written or oral) (i) that is a "material contract" within the
    meaning of Item 601(b)(10) of the SEC's Regulation S-K or (ii) that
    materially restricts the conduct of business by it or any of its
    Subsidiaries. Neither BKLA nor any of its Subsidiaries is in default under
    any contract, agreement, commitment, arrangement, lease, insurance policy or
    other instrument to which it is a party, by which its respective assets,
    business, or operations may be bound or affected, or under which it or its
    respective assets, business, or operations receives benefits, and there has
    not occurred any event that, with the lapse of time or the giving of notice
    or both, would constitute such a default.
 
        (l)  NO BROKERS.  No action has been taken by BKLA that would give rise
    to any valid claim against any party hereto for a brokerage commission,
    finder's fee or other like payment with respect to the transactions
    contemplated by this Agreement, excluding Previously Disclosed fees to be
    paid to Wedbush Morgan Securities and GBS Financial.
 
        (m)  EMPLOYEE BENEFIT PLANS.
 
        (i) All benefit and compensation plans, contracts, policies or
    arrangements covering current employees or former employees of BKLA and its
    subsidiaries (the "EMPLOYEES") and current or former directors of BKLA,
    including, but not limited to, "employee benefit plans" within the meaning
    of Section 3(3) of ERISA, and deferred compensation, stock option, stock
    purchase, stock appreciation rights, stock based, incentive and bonus plans
    (the "BENEFIT PLANS"), are Previously Disclosed in the Disclosure Schedule.
    True and complete copies of all Benefit Plans, including, but not limited
    to, any trust instruments and insurance contracts forming a part of any
    Benefit Plans, and all amendments thereto have been provided or made
    available to BKLA.
 
        (ii) All employee benefit plans, other than "multiemployer plans" within
    the meaning of Section 3(37) of ERISA, covering Employees (the "PLANS"), to
    the extent subject to ERISA, are in substantial compliance with ERISA. BKLA
    is not a party to any "employee pension benefit plan" within the meaning of
    Section 3(2) of ERISA ("PENSION PLAN") and which is intended to be qualified
    under Section 401(a) of the Code. There is no material pending or threatened
    litigation relating to the Plans. Neither BKLA nor any of its Subsidiaries
    has engaged in a transaction with respect to any Plan that, assuming the
    taxable period of such transaction expired as of the date hereof, could
    subject BKLA or any Subsidiary to a tax or penalty imposed by either Section
    4975 of the Code or Section 502(i) of ERISA in an amount which would be
    material.
 
   
       (iii) No liability under Subtitle C or D of Title IV of ERISA has been or
    is expected to be incurred by BKLA or any of its Subsidiaries with respect
    to any ongoing, frozen or terminated "single-employer plan", within the
    meaning of Section 4001(a)(15) of ERISA, currently or formerly maintained by
    any of them, or the single-employer plan of any entity which is considered
    one employer with BKLA under Section 4001 of ERISA or Section 414 of the
    Code (an "ERISA AFFILIATE"). Neither BKLA, any of its Subsidiaries nor an
    ERISA Affiliate has contributed to a "multiemployer plan", within the
    meaning of Section 3(37) of ERISA, at any time on or after September 26,
    1980. No notice of a "reportable event," within the meaning of Section 4043
    of ERISA for which the 30-day reporting requirement has not been waived, has
    been required to be filed for any Pension Plan or by any ERISA Affiliate
    within the 12-month period ending on the date hereof or will be required to
    be filed in connection with the transactions contemplated by this Plan.
    
 
        (iv) All contributions required to be made under the terms of any Plan
    have been timely made or have been reflected on the consolidated financial
    statements of BKLA included in the Regulatory Documents. Neither any Pension
    Plan nor any single-employer plan of an ERISA Affiliate has an "accumulated
    funding deficiency" (whether or not waived) within the meaning of Section
    412 of the Code or Section 302 of ERISA and no ERISA Affiliate has an
    outstanding funding waiver. Neither BKLA nor any of its Subsidiaries has
    provided, or is required to provide, security to any Pension Plan or to any
    single-employer plan of an ERISA Affiliate pursuant to Section 401(a)(29) of
    the Code.
 
                                      A-14
<PAGE>
        (v) Under each Pension Plan which is a single-employer plan, as of the
    last day of the most recent plan year ended prior to the date hereof, the
    actuarially determined present value of all "benefit liabilities," within
    the meaning of Section 4001(a)(16) of ERISA (as determined on the basis of
    the actuarial assumptions contained in the Plan's most recent actuarial
    valuation), did not exceed the then current value of the assets of such
    Plan, and there has been no material change in the financial condition of
    such Plan since the last day of the most recent plan year.
 
        (vi) Neither BKLA nor any of its Subsidiaries has any obligations for
    retiree health and life benefits under any Benefit Plan. BKLA or its
    Subsidiaries may amend or terminate any such Benefit Plan at any time
    without incurring any liability thereunder.
 
       (vii) The consummation of the transactions contemplated by this Agreement
    will not (A) entitle any employees of BKLA or any of its Subsidiaries to
    severance pay, (B) accelerate the time of payment or vesting or trigger any
    payment of compensation or benefits under, increase the amount payable or
    trigger any other material obligation pursuant to, any of the Benefit Plans
    or (C) result in any breach or violation of, or a default under, any of the
    Benefit Plans. Without limiting the foregoing, as a result of the
    consummation of the transactions contemplated by this Agreement, none of
    Western, BKLA, or any of its Subsidiaries will be obligated to make a
    payment to an individual that would be a "parachute payment" to a
    "disqualified individual" as those terms are defined in Section 280G of the
    Code, without regard to whether such payment is reasonable compensation for
    personal services performed or to be performed in the future.
 
        (n)  LABOR MATTERS.  Neither BKLA nor any of its Subsidiaries is a party
    to or is bound by any collective bargaining agreement, contract or other
    agreement or understanding with a labor union or labor organization, nor is
    BKLA or any of its Subsidiaries the subject of a proceeding asserting that
    it or any such Subsidiary has committed an unfair labor practice (within the
    meaning of the National Labor Relations Act) or seeking to compel BKLA or
    any such Subsidiary to bargain with any labor organization as to wages or
    conditions of employment, nor is there any strike or other labor dispute
    involving it or any of its Subsidiaries pending or, to BKLA's knowledge,
    threatened, nor is BKLA aware of any activity involving its or any of its
    Subsidiaries' employees seeking to certify a collective bargaining unit or
    engaging in other organizational activity.
 
        (o)  ENVIRONMENTAL MATTERS.
 
        (i) BKLA and each of its Subsidiaries has complied at all times with
    applicable Environmental Laws; (ii) no real property (including buildings or
    other structures) currently or formerly owned or operated by BKLA or any of
    its Subsidiaries, or any property in which BKLA or any of its Subsidiaries
    has held a security interest, lien or a fiduciary or management role ("LOAN
    PROPERTY"), has been contaminated with, or has had any release of, any
    Hazardous Substance; (iii) neither BKLA nor any of its Subsidiaries could be
    deemed the owner or operator of any Loan Property under any Environmental
    Law which such Loan Property has been contaminated with, or has had any
    release of, any Hazardous Substance; (iv) neither BKLA nor any of its
    Subsidiaries is subject to liability for any Hazardous Substance disposal or
    contamination on any third party property; (v) neither BKLA nor any of its
    Subsidiaries has received any notice, demand letter, claim or request for
    information alleging any violation of, or liability under, any Environmental
    Law; (vi) neither BKLA nor any of its Subsidiaries is subject to any order,
    decree, injunction or other agreement with any Governmental Authority or any
    third party relating to any Environmental Law; (vii) to the best of BKLA's
    knowledge, there are no circumstances or conditions (including the presence
    of asbestos, underground storage tanks, lead products, polychlorinated
    biphenyls, prior manufacturing operations, dry-cleaning, or automotive
    services) involving BKLA or any of its Subsidiaries, any currently or
    formerly owned or operated property, or any Loan Property, that could
    reasonably be expected to result in any claims, liability or investigations
    against BKLA or any of its Subsidiaries, result in any restrictions on the
    ownership, use, or transfer of any property pursuant to any Environmental
    Law, or adversely affect the value of any Loan Property, and (viii) BKLA has
    delivered to Western copies of all environmental
 
                                      A-15
<PAGE>
    reports, studies, sampling data, correspondence, filings and other
    environmental information in its possession or reasonably available to it
    relating to BKLA, any Subsidiary of BKLA, any currently or formerly owned or
    operated property or any Loan Property.
 
        As used herein, the term "ENVIRONMENTAL LAW" means any federal, state or
    local law, regulation, order, decree, permit, authorization, opinion, common
    law or agency requirement relating to: (A) the protection or restoration of
    the environment, health, safety, or natural resources, (B) the handling,
    use, presence, disposal, release or threatened release of any Hazardous
    Substance or (C) noise, odor, wetlands, indoor air, pollution, contamination
    or any injury or threat of injury to persons or property in connection with
    any Hazardous Substance and the term "HAZARDOUS SUBSTANCE" means any
    substance in any concentration that is: (A) listed, classified or regulated
    pursuant to any Environmental Law; (B) any petroleum product or by-product,
    asbestos-containing material, lead-containing paint or plumbing,
    polychlorinated biphenyls, radioactive materials or radon; or (C) any other
    substance which is or may be the subject of regulatory action by any
    Governmental Authority in connection with any Environmental Law.
 
        (p)  TAX MATTERS.  (i) (A) All Tax Returns that are required to be filed
    (taking into account any extensions of time within which to file) by or with
    respect to BKLA and its Subsidiaries have been duly filed, (B) all Taxes
    shown to be due on the Tax Returns referred to in clause (A) have been paid
    in full, (C) the Tax Returns referred to in clause (A) have been examined by
    the Internal Revenue Service or the appropriate Tax authority or the period
    for assessment of the Taxes in respect of which such Tax Returns were
    required to be filed has expired, (D) all deficiencies asserted or
    assessments made as a result of such examinations have been paid in full,
    (E) no issues that have been raised by the relevant taxing authority in
    connection with the examination of any of the Tax Returns referred to in
    clause (A) are currently pending, and (F) no waivers of statutes of
    limitation have been given by or requested with respect to any Taxes of BKLA
    or its Subsidiaries. BKLA has made available to Western true and correct
    copies of the United States federal income Tax Returns filed by BKLA and its
    Subsidiaries for each of the three most recent fiscal years ended on or
    before December 31, 1996. Neither BKLA nor any of its Subsidiaries has any
    liability with respect to income, franchise or similar Taxes that accrued on
    or before the end of the most recent period covered by BKLA's Regulatory
    Documents filed prior to the date hereof in excess of the amounts accrued
    with respect thereto that are reflected in the financial statements included
    in BKLA's Regulatory Documents filed on or prior to the date hereof. Neither
    BKLA nor any of its Subsidiaries is a party to any Tax allocation or sharing
    agreement, is or has been a member of an affiliated group filing
    consolidated or combined Tax returns (other than a group the common parent
    of which is or was BKLA) or otherwise has any liability for the Taxes of any
    person (other than BKLA and its Subsidiaries). As of the date hereof,
    neither BKLA nor any of its Subsidiaries has any reason to believe that any
    conditions exist that might prevent or impede the Merger from qualifying as
    a reorganization within the meaning of Section 368 of the Code.
 
        (ii) No Tax is required to be withheld pursuant to Section 1445 of the
    Code as a result of the transfer contemplated by this Agreement.
 
        (q)  RISK MANAGEMENT INSTRUMENTS.  All interest rate swaps, caps,
    floors, option agreements, futures and forward contracts and other similar
    risk management arrangements, whether entered into for BKLA's own account,
    or for the account of one or more of BKLA's Subsidiaries or their customers
    (all of which are listed on BKLA's Disclosure Schedule), if any, were
    entered into (i) in accordance with prudent business practices and all
    applicable laws, rules, regulations and regulatory policies and (ii) with
    counter parties believed to be financially responsible; and each of them
    constitutes the valid and legally binding obligation of BKLA or one of its
    Subsidiaries, enforceable in accordance with its terms (except as
    enforceability may be limited by applicable bankruptcy, insolvency,
    reorganization, moratorium, fraudulent transfer and similar laws of general
    applicability relating to or affecting creditors' rights or by general
    equity principles), and are in full force and effect. Neither BKLA nor its
 
                                      A-16
<PAGE>
    Subsidiaries, nor to BKLA's knowledge, any other party thereto, is in breach
    of any of its obligations under any such agreement or arrangement.
 
        (r)  BOOKS AND RECORDS.  The books and records of BKLA and its
    Subsidiaries have been fully, properly and accurately maintained in all
    material respects, and there are no material inaccuracies or discrepancies
    of any kind contained or reflected therein, and they fairly present the
    financial position of BKLA and its Subsidiaries.
 
        (s)  INSURANCE.  BKLA has Previously Disclosed all of the insurance
    policies, binders, or bonds maintained by BKLA or its Subsidiaries
    ("INSURANCE POLICIES"). BKLA and its Subsidiaries are insured with reputable
    insurers against such risks and in such amounts as the management of BKLA
    reasonably has determined to be prudent in accordance with industry
    practices. All the Insurance Policies are in full force and effect; BKLA and
    its Subsidiaries are not in material default thereunder; and all claims
    thereunder have been filed in due and timely fashion.
 
        (t)  ACCOUNTING TREATMENT.  As of the date hereof, BKLA is not aware of
    any reason with respect to it why the Merger will fail to qualify for
    "pooling of interests" accounting treatment.
 
    5.04  REPRESENTATIONS AND WARRANTIES OF WESTERN.  Subject to Sections 5.01
and 5.02 and except as Previously Disclosed in its Disclosure Schedule
corresponding to the relevant paragraph below, Western hereby represents and
warrants to BKLA:
 
        (a)  ORGANIZATION, STANDING AND AUTHORITY.  Each of Western and Santa
    Monica Bank is duly organized, validly existing and in good standing under
    the laws of the State of California. Each of Western and Santa Monica Bank
    is duly qualified to do business and is in good standing in the states of
    the United States and foreign jurisdictions where its ownership or leasing
    of property or assets or the conduct of its business requires it to be so
    qualified. Western and Santa Monica Bank have in effect all federal, state,
    local, and foreign governmental authorizations necessary for them to own or
    lease their respective properties and assets and to carry on their
    respective business as it is now conducted.
 
        (b)  WESTERN CAPITAL STOCK.  As of the date hereof, the authorized
    capital stock of Western consists solely of 100,000,000 shares of Western
    Common Stock, of which no more than 15,704,000 shares were outstanding as of
    the date hereof and 5,000,000 shares of Western Preferred Stock, of which no
    shares were outstanding as of the date hereof.
 
        (c)  SANTA MONICA BANK CAPITAL STOCK.  As of the date hereof, the
    authorized capital stock of Santa Monica Bank consists solely of 50,000,000
    shares of Santa Monica Bank common stock, of which one share was outstanding
    as of the date hereof.
 
        (d)  CORPORATE POWER.  Western and each of its Significant Subsidiaries
    has the corporate power and authority to carry on its business as it is now
    being conducted and to own all its properties and assets; and each of
    Western and Santa Monica Bank has the corporate power and authority to
    execute, deliver and perform its obligations under this Agreement and to
    consummate the transactions contemplated hereby.
 
        (e)  CORPORATE AUTHORITY.  This Agreement and the transactions
    contemplated hereby have been authorized by all necessary corporate action
    of each of Western and Santa Monica Bank and their respective board of
    directors. This Agreement is a valid and legally binding agreement of each
    of Western and Santa Monica Bank, as the case may be, enforceable in
    accordance with its terms (except as enforceability may be limited by
    applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent
    transfer and similar laws of general applicability relating to or affecting
    creditors' rights or by general equity principles).
 
        (f)  REGULATORY APPROVALS; NO DEFAULTS.  (i) No consents or approvals
    of, or filings or registrations with, any court, administrative agency or
    commission or other governmental authority or instrumentality or with any
    third party are required to be made or obtained by Western or any of its
 
                                      A-17
<PAGE>
    Subsidiaries in connection with the execution, delivery or performance by
    either Western or Santa Monica Bank of this Agreement or to consummate the
    Merger except for (A) the filing of applications and notices, as applicable,
    with federal and state banking Governmental Authorities; (B) approval of the
    listing on the NASDAQ of Western Common Stock to be issued in the Merger;
    (C) the filing and declaration of effectiveness of the Registration
    Statement; (D) the filing of an agreement of merger with the California
    Secretary pursuant to the CGCL; (E) filing of an agreement of merger with
    the Commissioner pursuant to the California Financial Code; (F) such filings
    as are required to be made or approvals as are required to be obtained under
    the securities or "Blue Sky" laws of various states in connection with the
    issuance of Western Common Stock in the Merger; and (G) receipt of the
    approvals set forth in Section 7.01(b). As of the date hereof, Western is
    not aware of any reason why the approvals set forth in Section 7.01(b) will
    not be received without the imposition of a condition, restriction or
    requirement of the type described in Section 7.01(b).
 
        (ii) Subject to receipt of the regulatory approvals referred to in the
    preceding paragraph and expiration of the related waiting periods, and
    required filings under federal and state securities laws, the execution,
    delivery and performance of this Agreement and the consummation of the
    transactions contemplated hereby do not and will not (A) constitute a breach
    or violation of, or a default under, or give rise to any Lien, any
    acceleration of remedies or any right of termination under, any law, rule or
    regulation or any judgment, decree, order, governmental permit or license,
    or agreement, indenture or instrument of Western or of any of its
    Subsidiaries or to which Western or any of its Subsidiaries or properties is
    subject or bound, (B) constitute a breach or violation of, or a default
    under, the articles of incorporation or by-laws (or similar governing
    documents) of Western or any of its Significant Subsidiaries, or (C) require
    any consent or approval under any such law, rule, regulation, judgment,
    decree, order, governmental permit or license, agreement, indenture or
    instrument.
 
        (g)  FINANCIAL REPORTS AND REGULATORY DOCUMENTS; MATERIAL ADVERSE
    EFFECT.  (i) Western's Regulatory Documents, as of the date filed, (A)
    complied or will comply in all material respects as to form with the
    applicable requirements under the Securities Act or the Exchange Act, as the
    case may be, and (B) did not and will not contain any untrue statement of a
    material fact or omit to state a material fact required to be stated therein
    or necessary to make the statements therein, in the light of the
    circumstances under which they were made, not misleading; and each of the
    balance sheets contained in or incorporated by reference into any such
    Regulatory Document (including the related notes and schedules thereto)
    fairly presents, or will fairly present, the financial position of Western
    and its Subsidiaries as of its date, and each of the statements of income
    and changes in shareholders' equity and cash flows or equivalent statements
    in such Regulatory Documents (including any related notes and schedules
    thereto) fairly presents, or will fairly present, the results of operations,
    changes in shareholders' equity and cash flows, as the case may be, of
    Western and its Subsidiaries for the periods to which they relate, in each
    case in accordance with generally accepted accounting principles
    consistently applied during the periods involved, except in each case as may
    be noted therein, subject to normal year-end audit adjustments in the case
    of unaudited statements.
 
        (ii) Since December 31, 1997, no event has occurred or circumstance
    arisen that, individually or taken together with all other facts,
    circumstances and events (described in any paragraph of this Section 5.04 or
    otherwise), is reasonably likely to have a Material Adverse Effect with
    respect to it.
 
        (h)  NO BROKERS.  No action has been taken by Western that would give
    rise to any valid claim against any party hereto for a brokerage commission,
    finder's fee or other like payment with respect to the transactions
    contemplated by this Agreement, excluding a Previously Disclosed fee payable
    to Belle Plaine Partners, Inc.
 
        (i)  ACCOUNTING TREATMENT; TAX MATTERS.  As of the date hereof, Western
    is aware of no reason with respect to it why the Merger will fail to qualify
    for "pooling of interests" accounting treatment. As of the date hereof,
    neither Western nor any of its Subsidiaries has any reason to believe that
    any
 
                                      A-18
<PAGE>
    conditions exist that might prevent or impede the Merger from qualifying as
    a reorganization within the meaning of Section 368 of the Code.
 
        (j)  REGULATORY MATTERS.  (i) Neither Western nor any of its Significant
    Subsidiaries or any of its properties is a party to or is subject to any
    order, decree, agreement, memorandum of understanding or similar arrangement
    with, or a commitment letter or similar submission to, or extraordinary
    supervisory letter from, any Regulatory Authorities.
 
        (ii) Neither Western nor any of its Significant Subsidiaries has been
    advised by, nor has any knowledge of facts which could give rise to an
    advisory notice by, any Regulatory Authority that such Regulatory Authority
    is contemplating issuing or requesting (or is considering the
    appropriateness of issuing or requesting) any such order, decree, agreement,
    memorandum of understanding, commitment letter, supervisory letter or
    similar submission.
 
        (k)  COMPLIANCE WITH LAWS.  Each of Western and its Significant
    Subsidiaries:
 
            (i) is in compliance with all applicable federal, state, local and
       foreign statutes, laws, regulations, ordinances, rules, judgments, orders
       or decrees applicable thereto or to the employees conducting such
       businesses, including, without limitation, the Equal Credit Opportunity
       Act, the Fair Housing Act, the Community Reinvestment Act, the Home
       Mortgage Disclosure Act and all other applicable fair lending laws and
       other laws relating to discriminatory business practices;
 
            (ii) has all permits, licenses, authorizations, orders and approvals
       of, and has made all filings, applications and registrations with, all
       Governmental Authorities that are required in order to permit them to own
       or lease their properties and to conduct their businesses as presently
       conducted; all such permits, licenses, certificates of authority, orders
       and approvals are in full force and effect and, to Western's knowledge,
       no suspension or cancellation of any of them is threatened; and
 
           (iii) has received, since December 31, 1996, no notification or
       communication from any Governmental Authority (A) asserting that Western
       or any of its Significant Subsidiaries is not in compliance with any of
       the statutes, regulations or ordinances which such Governmental Authority
       enforces or (B) threatening to revoke any license, franchise, permit or
       governmental authorization (nor, to Western's knowledge, do any grounds
       for any of the foregoing exist).
 
        (l)  BOOKS AND RECORDS.  The books and records of each of Western and
    its Significant Subsidiaries have been fully, properly and accurately
    maintained in all material respects, and there are no material inaccuracies
    or discrepancies of any kind contained or reflected therein, and they fairly
    present the financial position of Western and its Significant Subsidiaries.
 
        (m)  ENVIRONMENTAL MATTERS.
 
        (i) Each of Western and its Significant Subsidiaries has complied at all
    times with applicable Environmental Laws; (ii) no real property (including
    buildings or other structures) currently or formerly owned or operated by
    Western or its Significant Subsidiaries, or any Loan Property, has been
    contaminated with, or has had any release of, any Hazardous Substance; (iii)
    neither Western nor any of its Significant Subsidiaries could be deemed the
    owner or operator of any Loan Property under any Environmental Law which
    such Loan Property has been contaminated with, or has had any release of,
    any Hazardous Substance; (iv) neither Western nor any of its Significant
    Subsidiaries is subject to liability for any Hazardous Substance disposal or
    contamination on any third party property; (v) neither Western nor any of
    its Significant Subsidiaries has received any notice, demand letter, claim
    or request for information alleging any violation of, or liability under,
    any Environmental Law; (vi) neither Western nor any of its Significant
    Subsidiaries is subject to any order, decree, injunction or other agreement
    with any Governmental Authority or any third party relating to any
    Environmental Law; (vii) to the best of Western's knowledge, there are no
    circumstances or conditions (including the presence of asbestos, underground
    storage tanks, lead products, polychlorinated biphenyls, prior
 
                                      A-19
<PAGE>
    manufacturing operations, dry-cleaning, or automotive services) involving
    Western or its Significant Subsidiaries, any currently or formerly owned or
    operated property, or any Loan Property, that could reasonably be expected
    to result in any claims, liability or investigations against Western or its
    Significant Subsidiaries, result in any restrictions on the ownership, use,
    or transfer of any property pursuant to any Environmental Law, or adversely
    affect the value of any Loan Property, and (viii) each of Western and its
    Significant Subsidiaries has made available to BKLA copies of all
    environmental reports, studies, sampling data, correspondence, filings and
    other environmental information in its possession or reasonably available to
    it, if any, relating to each of Western and its Significant Subsidiaries,
    any currently or formerly owned or operated property or any Loan Property.
 
                                   ARTICLE VI
 
                                   COVENANTS
 
    6.01  REASONABLE BEST EFFORTS.  Subject to the terms and conditions of this
Agreement, each of BKLA, Western and Santa Monica Bank agrees to use its
reasonable best efforts in good faith to take, or cause to be taken, all
actions, and to do, or cause to be done, all things necessary, proper or
desirable, or advisable under applicable laws, so as to permit consummation of
the Merger as promptly as practicable and otherwise to enable consummation of
the transactions contemplated hereby and shall cooperate fully with the other
party hereto to that end.
 
    6.02  SHAREHOLDER APPROVAL.  BKLA agrees to take, in accordance with
applicable law and the BKLA Articles and the BKLA By-Laws, all action necessary
to convene an appropriate meeting of its shareholders to consider and vote upon
the approval and adoption of this Agreement and any other matters required to be
approved by BKLA's shareholders for consummation of the Merger (including any
adjournment or postponement, the "BKLA MEETING"), in each case as promptly as
practicable after the Registration Statement is declared effective. Except to
the extent legally required for the discharge by the BKLA Board of its fiduciary
duties as advised by counsel to the BKLA Board, the BKLA Board shall recommend
such approval, and BKLA shall take all reasonable, lawful action to solicit such
approval by its shareholders.
 
    6.03  REGISTRATION STATEMENT.  (a) Western agrees to prepare a registration
statement on Form S-4 or other applicable form (the "REGISTRATION STATEMENT") to
be filed by Western with the SEC in connection with the issuance of Western
Common Stock in the Merger (including the proxy statement and prospectus and
other proxy solicitation materials of BKLA constituting a part thereof (the
"PROXY STATEMENT") and all related documents). BKLA agrees to cooperate, and to
cause its Subsidiaries to cooperate, with Western, its counsel and its
accountants, in preparation of the Registration Statement and the Proxy
Statement. BKLA agrees to file the Proxy Statement in preliminary form with the
FDIC as soon as reasonably practicable on a confidential basis, and Western
agrees to file the Registration Statement with the SEC as soon as reasonably
practicable on a confidential basis, after any SEC comments with respect to the
preliminary Proxy Statement are resolved. Each of BKLA and Western agrees to use
all reasonable efforts to cause the Registration Statement to be declared
effective under the Securities Act as promptly as reasonably practicable after
filing thereof. Western also agrees to use all reasonable efforts to obtain all
necessary state securities law or "Blue Sky" permits and approvals required to
carry out the transactions contemplated by this Agreement. BKLA agrees to
furnish to Western all information concerning BKLA, its Subsidiaries, officers,
directors and shareholders as may be reasonably requested in connection with the
foregoing.
 
    (b) Each of BKLA and Western agrees, as to itself and its Subsidiaries, that
none of the information supplied or to be supplied by it for inclusion or
incorporation by reference in (i) the Registration Statement will, at the time
the Registration Statement and each amendment or supplement thereto, if any,
becomes effective under the Securities Act, contain any untrue statement of a
material fact or omit to state any material fact required to be stated therein
or necessary to make the statements therein not misleading, and (ii) the Proxy
Statement and any amendment or supplement thereto will, at the date of mailing
to shareholders and at the time of the BKLA Meeting, contain any untrue
statement of a material fact or
 
                                      A-20
<PAGE>
omit to state any material fact required to be stated therein or necessary to
make the statements therein not misleading or any statement which, in the light
of the circumstances under which such statement is made, will be false or
misleading with respect to any material fact, or which will omit to state any
material fact necessary in order to make the statements therein not false or
misleading or necessary to correct any statement in any earlier statement in the
Proxy Statement or any amendment or supplement thereto. Each of BKLA and Western
further agrees that if it shall become aware prior to the Effective Date of any
information furnished by it that would cause any of the statements in the Proxy
Statement to be false or misleading with respect to any material fact, or to
omit to state any material fact necessary to make the statements therein not
false or misleading, promptly to inform the other party thereof and to take the
necessary steps to correct the Proxy Statement.
 
    (c) Western agrees to advise BKLA, promptly after Western receives notice
thereof, of the time when the Registration Statement has become effective or any
supplement or amendment has been filed, of the issuance of any stop order or the
suspension of the qualification of Western Common Stock for offering or sale in
any jurisdiction, of the initiation or threat of any proceeding for any such
purpose, or of any request by the SEC for the amendment or supplement of the
Registration Statement or for additional information.
 
    6.04  PRESS RELEASES.  Each of BKLA and Western agrees that it will not,
without the prior approval of the other party, issue any press release or
written statement for general circulation relating to the transactions
contemplated hereby, except as otherwise required by applicable law or
regulation or NASDAQ rules (provided that the issuing party shall nevertheless
provide the other party with notice of, and the opportunity to review, any such
press release or written statement).
 
    6.05  ACCESS; INFORMATION.  (a) Each of BKLA and Western agrees that upon
reasonable notice and subject to applicable laws relating to the exchange of
information, each party shall afford the other party and the other party's
officers, employees, counsel, accountants and other authorized representatives,
such access during normal business hours throughout the period prior to the
Effective Time to the books, records (including, without limitation, tax returns
and work papers of independent auditors), properties, personnel and to such
other information as the requesting party may reasonably request and, during
such period, the providing party shall furnish promptly to the requesting party
(i) a copy of each material report, schedule and other document filed by it
pursuant to the requirements of federal or state securities or banking laws, and
(ii) all other information concerning the business, properties and personnel of
it as the requesting party may reasonably request.
 
    (b) Each party agrees that it will not, and will cause its representatives
not to, use any information obtained pursuant to this Section 6.05 (as well as
any other information obtained prior to the date hereof in connection with the
entering into of this Agreement) for any purpose unrelated to the consummation
of the transactions contemplated by this Agreement or the Stock Option
Agreement. Subject to the requirements of law, each party will keep
confidential, and will cause its representatives to keep confidential, all
information and documents obtained pursuant to this Section 6.05 (as well as any
other information obtained prior to the date hereof in connection with the
entering into of this Agreement) unless such information (i) was already known
to such party, (ii) becomes available to such party from other sources not known
by such party to be bound by a confidentiality obligation, (iii) is disclosed
with the prior written approval of the providing party or (iv) is or becomes
readily ascertainable from published information or trade sources. In the event
that this Agreement is terminated or the transactions contemplated by this
Agreement shall otherwise fail to be consummated, each party shall promptly
cause all copies of documents or extracts thereof containing information and
data as to the other party to be returned to the other party. No investigation
by either party of the business and affairs of the other party shall affect or
be deemed to modify or waive any representation, warranty, covenant or agreement
in this Agreement, or the conditions to either party's obligation to consummate
the transactions contemplated by this Agreement.
 
                                      A-21
<PAGE>
    6.06  ACQUISITION PROPOSALS.  BKLA agrees that it shall not, and shall cause
its Subsidiaries and its and its Subsidiaries' officers, directors, agents,
advisors and affiliates not to, solicit or encourage inquiries or proposals with
respect to, or engage in any negotiations concerning, or provide any
confidential information to, or have any discussions with, any person relating
to, any Acquisition Proposal, except to the extent legally required for the
discharge by the BKLA Board of its fiduciary duties as advised by counsel to the
BKLA Board. BKLA shall immediately cease and cause to be terminated any
activities, discussions or negotiations conducted prior to the date of this
Agreement with any parties other than Western with respect to any of the
foregoing and shall use its reasonable best efforts to enforce any
confidentiality or similar agreement relating to an Acquisition Proposal. BKLA
shall promptly (within 24 hours) advise Western following the receipt by BKLA of
any Acquisition Proposal and the substance thereof (including the identity of
the person making such Acquisition Proposal), and advise Western of any
developments with respect to such Acquisition Proposal immediately upon the
occurrence thereof.
 
    6.07  AFFILIATE AGREEMENTS.  (a) Not later than the 15th day prior to the
mailing of the Proxy Statement, BKLA shall deliver to Western a schedule of each
person that, to the best of its knowledge, is or is reasonably likely to be, as
of the date of the BKLA Meeting, deemed to be an "affiliate" of BKLA (each, a
"BKLA AFFILIATE") as that term is used in Rule 145 under the Securities Act or
SEC Accounting Series Releases 130 and 135.
 
    (b) BKLA shall use its reasonable best efforts to cause each person who may
be deemed to be a BKLA Affiliate to execute and deliver to Western on or before
the date of mailing of the Proxy Statement an agreement in the form attached
hereto as EXHIBIT A (the "Affiliate Agreements").
 
    6.08  TAKEOVER LAWS.  No party hereto shall take any action that would cause
the transactions contemplated by this Agreement or the Stock Option Agreement to
be subject to requirements imposed by any Takeover Law and each of them shall
take all necessary steps within its control to exempt (or ensure the continued
exemption of) the transactions contemplated by this Agreement from, or if
necessary challenge the validity or applicability of, any applicable Takeover
Law, as now or hereafter in effect.
 
    6.09  CERTAIN POLICIES.  Prior to the Effective Date, BKLA shall, consistent
with generally accepted accounting principles and on a basis mutually
satisfactory to it and Western, modify and change its loan, litigation and real
estate valuation policies and practices (including loan classifications and
levels of reserves) so as to be applied on a basis that is consistent with that
of Western.
 
    6.10  NASDAQ LISTING.  Western agrees to use its reasonable best efforts to
list, prior to the Effective Date, on the NASDAQ, subject to official notice of
issuance, the shares of Western Common Stock to be issued to the holders of BKLA
Common Stock in the Merger.
 
    6.11  REGULATORY APPLICATIONS.  (a) Western and BKLA and their respective
Subsidiaries shall cooperate and use their respective reasonable best efforts to
prepare all documentation, to effect all filings and to obtain all permits,
consents, approvals and authorizations of all third parties and Governmental
Authorities necessary to consummate the transactions contemplated by this
Agreement. Western and BKLA shall use their reasonable best efforts to make all
required bank regulatory filings, including the appropriate filings with the
Commissioner, the FDIC and the Federal Reserve. Each of Western and BKLA shall
have the right to review in advance, and to the extent practicable each will
consult with the other, in each case subject to applicable laws relating to the
exchange of information, with respect to all material written information
submitted to any third party or any Governmental Authority in connection with
the transactions contemplated by this Agreement. In exercising the foregoing
right, each of the parties hereto agrees to act reasonably and as promptly as
practicable. Each party hereto agrees that it will consult with the other party
hereto with respect to the obtaining of all material permits, consents,
approvals and authorizations of all third parties and Governmental Authorities
necessary or advisable to consummate the transactions contemplated by this
Agreement and each party will keep the other party appraised of the status of
material matters relating to completion of the transactions contemplated hereby.
 
                                      A-22
<PAGE>
    (b) Each party agrees, upon request, to furnish the other party with all
information concerning itself, its Subsidiaries, directors, officers and
shareholders and such other matters as may be reasonably necessary or advisable
in connection with any filing, notice or application made by or on behalf of
such other party or any of its Subsidiaries to any third party or Governmental
Authority.
 
    6.12  INDEMNIFICATION; DIRECTOR AND OFFICERS' INSURANCE.  (a) From and after
the Effective Time through the sixth anniversary of the Effective Date, Western
agrees to indemnify and hold harmless each present and former director and
officer of BKLA or any Subsidiary of BKLA determined as of the Effective Time
(the "INDEMNIFIED PARTIES"), against any costs or expenses (including reasonable
attorneys' fees), judgments, fines, losses, claims, damages or liabilities
(collectively, "COSTS") incurred in connection with any claim, action, suit,
proceeding or investigation, whether civil, criminal, administrative or
investigative, arising out of matters existing or occurring at or prior to the
Effective Time (including with respect to this Agreement or any of the
transactions contemplated hereby) (but excluding any Costs arising out of any
violation or alleged violation of the Exchange Act or the rules and regulations
thereunder with respect to insider trading), whether asserted, claimed or
arising prior to, at or after the Effective Time, to the extent to which such
Indemnified Parties were entitled under California law and the BKLA Articles or
the BKLA By-Laws in effect on the date hereof, and Western shall also advance
expenses as incurred to the extent permitted under California law, the Western
Articles and the Western By-Laws and, with respect to any Indemnified Party, any
indemnification agreement to which such person is a party.
 
    (b) Any Indemnified Party wishing to claim indemnification under Section
6.12(a), upon learning of any such claim, action, suit, proceeding or
investigation, shall as promptly as possible notify Western thereof, but the
failure to so notify shall not relieve Western of any liability it may have to
such Indemnified Party if such failure does not materially prejudice Western. In
the event of any such claim, action, suit, proceeding or investigation (whether
arising before or after the Effective Time), (i) Western shall have the right to
assume the defense thereof and Western shall not be liable to such Indemnified
Parties for any legal expenses of other counsel or any other expenses
subsequently incurred by such Indemnified Parties in connection with the defense
thereof, except that if Western elects not to assume such defense or counsel for
the Indemnified Parties advises in writing that there are issues which raise
conflicts of interest between Western and the Indemnified Parties, the
Indemnified Parties may retain counsel satisfactory to them, and Western shall
pay the reasonable fees and expenses of one such counsel for the Indemnified
Parties in any jurisdiction promptly as statements thereof are received, (ii)
the Indemnified Parties will cooperate in the defense of any such matter and
(iii) Western shall not be liable for any settlement effected without its prior
written consent (which consent shall not be unreasonably withheld); and
PROVIDED, FURTHER, that Western shall not have any obligation hereunder to any
Indemnified Party when and if a court of competent jurisdiction shall ultimately
determine, and such determination shall have become final and nonappealable,
that the indemnification of such Indemnified Party in the manner contemplated
hereby is not permitted or is prohibited by applicable law.
 
    (c) For a period of six years after the Effective Time, Western shall use
its reasonable best efforts to cause to be maintained in effect at a minimum the
current policies of directors' and officers' liability insurance maintained by
BKLA (provided that Western may substitute therefor policies of comparable
coverage with respect to claims arising from facts or events which occurred
before the Effective Time); PROVIDED, HOWEVER, that in no event shall Western be
obligated to expend, in order to maintain or provide insurance coverage pursuant
to this Section 6.12(c), any amount per annum in excess of 125% of the amount of
the annual premiums paid as of the date hereof by BKLA for such insurance (the
"MAXIMUM AMOUNT"). If the amount of the annual premiums necessary to maintain or
procure such insurance coverage exceeds the Maximum Amount, Western shall use
all reasonable efforts to maintain the most advantageous policies of directors'
and officers' insurance obtainable for an annual premium equal to the Maximum
Amount. Notwithstanding the foregoing, prior to the Effective Time, Western may
request BKLA to, and BKLA shall, purchase insurance coverage, on such terms and
conditions as shall be acceptable to Western, extending for a period of six
years BKLA's directors' and officers' liability insurance
 
                                      A-23
<PAGE>
coverage in effect as of the date hereof (covering past or future claims with
respect to periods before the Effective Time) and such coverage shall satisfy
Western's obligations under this Section 6.12(c).
 
    (d) If Western or any of its successors or assigns (i) shall consolidate
with or merge into any other corporation or entity and shall not be the
continuing or surviving corporation or entity of such consolidation or merger or
(ii) shall transfer all or substantially all of its properties and assets to any
individual, corporation or other entity, then and in each such case, proper
provision shall be made so that the successors and assigns of Western shall
assume the obligations set forth in this Section 6.12.
 
    6.13  BENEFIT PLANS.  BKLA consents and covenants that from and after the
Effective Date BKLA's Benefits Plans will be governed, managed and/or terminated
by Western, all within Western's sole discretion.
 
    6.14  ACCOUNTANTS' LETTERS.  Each of BKLA and Western shall use its
reasonable best efforts to cause to be delivered to the other party, and to
Western's directors and officers who sign the Registration Statement, a letter
of their respective independent auditors, dated (i) the date on which the
Registration Statement shall become effective and (ii) a date shortly prior to
the Effective Date, and addressed to such directors and officers, in form and
substance customary for "comfort" letters delivered by independent accountants
in accordance with Statement of Accounting Standards No. 72.
 
    6.15  NOTIFICATION OF CERTAIN MATTERS.  Each of BKLA and Western shall give
prompt notice to the other of any fact, event or circumstance known to it that
(i) is reasonably likely, individually or taken together with all other facts,
events and circumstances known to it, to result in any Material Adverse Effect
with respect to it or (ii) would cause or constitute a material breach of any of
its representations, warranties, covenants or agreements contained herein.
 
    6.16  SHAREHOLDER AGREEMENTS.  The directors and certain officers and
shareholders of BKLA, in their capacities as shareholders, in exchange for good
and valuable consideration, have executed and delivered to Western shareholder
agreements substantially in the form of EXHIBIT B hereto (the "SHAREHOLDER
AGREEMENTS"), committing such persons, among other things, (i) to vote their
shares of BKLA Common Stock in favor of the Agreement at the BKLA Meeting and
(ii) to certain representations concerning the ownership of BKLA Common Stock
and Western Common Stock to be received in the Merger.
 
                                  ARTICLE VII
 
                    CONDITIONS TO CONSUMMATION OF THE MERGER
 
    7.01  CONDITIONS TO EACH PARTY'S OBLIGATION TO EFFECT THE MERGER.  The
respective obligation of each of Western and BKLA to consummate the Merger is
subject to the fulfillment or written waiver by Western and BKLA prior to the
Effective Time of each of the following conditions:
 
        (a)  SHAREHOLDER APPROVALS.  This Agreement and the Merger shall have
    been duly adopted by the requisite vote of the shareholders of BKLA.
 
        (b)  REGULATORY APPROVALS.  All regulatory approvals required to
    consummate the transactions contemplated hereby shall have been obtained and
    shall remain in full force and effect and all statutory waiting periods in
    respect thereof shall have expired and no such approvals shall contain any
    conditions, restrictions or requirements which the Western Board reasonably
    determines would (i) following the Effective Time, have a Material Adverse
    Effect on the Surviving Corporation and its Subsidiaries taken as a whole or
    (ii) reduce the benefits of the transactions contemplated hereby to such a
    degree that Western would not have entered into this Agreement had such
    conditions, restrictions or requirements been known at the date hereof.
 
        (c)  NO INJUNCTION.  No Governmental Authority of competent jurisdiction
    shall have enacted, issued, promulgated, enforced or entered any statute,
    rule, regulation, judgment, decree, injunction or
 
                                      A-24
<PAGE>
    other order (whether temporary, preliminary or permanent) which is in effect
    and prohibits consummation of the transactions contemplated by this
    Agreement.
 
        (d)  REGISTRATION STATEMENT.  The Registration Statement shall have
    become effective under the Securities Act and no stop order suspending the
    effectiveness of the Registration Statement shall have been issued and no
    proceedings for that purpose shall have been initiated or threatened by the
    SEC.
 
        (e)  BLUE SKY APPROVALS.  All permits and other authorizations under
    state securities laws necessary to consummate the transactions contemplated
    hereby and to issue the shares of Western Common Stock to be issued in the
    Merger shall have been received and be in full force and effect.
 
        (f)  LISTING.  The shares of Western Common Stock to be issued in the
    Merger shall have been approved for listing on the NASDAQ, subject to
    official notice of issuance.
 
    7.02  CONDITIONS TO OBLIGATION OF BKLA.  The obligation of BKLA to
consummate the Merger is also subject to the fulfillment or written waiver by
BKLA prior to the Effective Time of each of the following conditions:
 
        (a)  REPRESENTATIONS AND WARRANTIES.  The representations and warranties
    of Western set forth in this Agreement (subject to the standard set forth in
    Section 5.02) shall be true and correct as of the date of this Agreement and
    as of the Effective Date as though made on and as of the Effective Date
    (except that representations and warranties that by their terms speak only
    as of the date of this Agreement or some other date shall be true and
    correct as of such date), and BKLA shall have received a certificate, dated
    the Effective Date, signed on behalf of Western by the Chief Executive
    Officer and the Chief Financial Officer of Western to such effect.
 
        (b)  PERFORMANCE OF OBLIGATIONS OF WESTERN.  Western shall have
    performed in all material respects all obligations required to be performed
    by it under this Agreement at or prior to the Effective Time, and BKLA shall
    have received a certificate, dated the Effective Date, signed on behalf of
    Western by the Chief Executive Officer and the Chief Financial Officer of
    Western to such effect.
 
        (c)  ACCOUNTANTS' LETTERS.  BKLA shall have received the letters
    referred to in Section 6.14 from Western's independent auditors.
 
        (d)  OPINION OF BKLA'S INDEPENDENT AUDITORS; ACCOUNTING TREATMENT.  BKLA
    shall have received from Vavrinek, Trine, Day & Co., LLP, its independent
    auditors, (i) an opinion dated the Effective Date, to the effect that, on
    the basis of facts, representations and assumptions set forth in such
    opinion, (A) the Merger constitutes a "reorganization" within the meaning of
    Section 368 of the Code and (B) no gain or loss will be recognized by
    shareholders of BKLA who receive shares of Western Common Stock in exchange
    for shares of BKLA Common Stock, except with respect to cash received in
    lieu of fractional share interests, and (ii) letters, dated the date of or
    shortly prior to each of the mailing date of the Proxy Statement and the
    Effective Date, stating its opinion that the Merger shall qualify for
    pooling-of-interests accounting treatment. In rendering its opinion,
    Vavrinek, Trine, Day & Co., LLP may require and rely upon representations
    contained in letters from BKLA, Western and shareholders of BKLA.
 
        (e)  DIRECTOR.  Western shall have elected as a director, the individual
    agreed in accordance with Section 2.01 hereof, effective immediately after
    the Effective Time.
 
    7.03  CONDITIONS TO OBLIGATION OF WESTERN.  The obligation of Western to
consummate the Merger is also subject to the fulfillment or written waiver by
Western prior to the Effective Time of each of the following conditions:
 
        (a)  REPRESENTATIONS AND WARRANTIES.  The representations and warranties
    of BKLA set forth in this Agreement (subject to the standard set forth in
    Section 5.02) shall be true and correct as of the date of this Agreement and
    as of the Effective Date as though made on and as of the Effective Date
 
                                      A-25
<PAGE>
    (except that representations and warranties that by their terms speak only
    as of the date of this Agreement or some other date shall be true and
    correct as of such date) and Western shall have received a certificate,
    dated the Effective Date, signed on behalf of BKLA by the Chief Executive
    Officer and the Chief Financial Officer of BKLA to such effect.
 
        (b)  PERFORMANCE OF OBLIGATIONS OF BKLA.  BKLA shall have performed in
    all material respects all obligations required to be performed by it under
    this Agreement at or prior to the Effective Time, and Western shall have
    received a certificate, dated the Effective Date, signed on behalf of BKLA
    by the Chief Executive Officer and the Chief Financial Officer of BKLA to
    such effect.
 
        (c)  OPINION OF WESTERN'S COUNSEL.  Western shall have received an
    opinion of Sullivan & Cromwell, special counsel to Western, dated the
    Effective Date, to the effect that, on the basis of facts, representations
    and assumptions set forth in such opinion, the Merger constitutes a
    reorganization under Section 368 of the Code. In rendering its opinion,
    Sullivan & Cromwell may require and rely upon representations contained in
    letters from BKLA, Western and shareholders of BKLA.
 
        (d)  ACCOUNTANTS' LETTERS.  Western shall have received the letters
    referred to in Section 6.14 from BKLA's independent auditors.
 
        (e)  ACCOUNTING TREATMENT.  Western shall have received from KPMG Peat
    Marwick LLP, Western's independent auditors, letters, dated the date of or
    shortly prior to each of the mailing date of the Proxy Statement and the
    Effective Date, stating its opinion that the Merger shall qualify for
    pooling-of-interests accounting treatment.
 
                                  ARTICLE VIII
 
                                  TERMINATION
 
    8.01  TERMINATION.  This Agreement may be terminated, and the Acquisition
may be abandoned:
 
        (a)  MUTUAL CONSENT.  At any time prior to the Effective Time, by the
    mutual consent of Western and BKLA, if the Board of Directors of each so
    determines by vote of a majority of the members of its entire Board.
 
        (b)  BREACH.  At any time prior to the Effective Time, by Western or
    BKLA, if its Board of Directors so determines by vote of a majority of the
    members of its entire Board, in the event of either: (i) a breach by the
    other party of any representation or warranty contained herein (subject to
    the standard set forth in Section 5.02), which breach cannot be or has not
    been cured within 30 days after the giving of written notice to the
    breaching party of such breach; or (ii) a breach by the other party of any
    of the covenants or agreements contained herein, which breach cannot be or
    has not been cured within 30 days after the giving of written notice to the
    breaching party of such breach, provided that such breach (whether under (i)
    or (ii)) would be reasonably likely, individually or in the aggregate with
    other breaches, to result in a Material Adverse Effect.
 
        (c)  DELAY.  At any time prior to the Effective Time, by Western or
    BKLA, if its Board of Directors so determines by vote of a majority of the
    members of its entire Board, in the event that the Merger is not consummated
    by December 31, 1998.
 
        (d)  NO APPROVAL.  By BKLA or Western in the event (i) the approval of
    any Governmental Authority required for consummation of the Merger and the
    other transactions contemplated by this Agreement shall have been denied by
    final nonappealable action of such Governmental Authority or (ii) the
    shareholder approval required by Section 7.01(a) herein is not obtained at
    the BKLA Meeting.
 
        (e)  FAILURE TO RECOMMEND, ETC.  At any time prior to the BKLA Meeting,
    by Western if the BKLA Board shall have failed to make its recommendation
    referred to in Section 6.02, withdrawn
 
                                      A-26
<PAGE>
    such recommendation or modified or changed such recommendation in a manner
    adverse in any respect to the interests of Western.
 
        (f)  TERMINATION BY WESTERN.  This Agreement may be terminated and the
    Merger may be abandoned by Western by the giving of notice to BKLA at any
    time prior to 5 p.m. on April 29, 1998, if Western determines in its sole
    discretion, upon completion of its due diligence review of BKLA, to so
    terminate.
 
        (g)  WESTERN COMMON STOCK.  This Agreement may be terminated by BKLA in
    the event that, with respect to any Ten Day Period (as defined below), both
    (i)(A) the Ten Day Average Price (as defined below) shall be less that
    $35.37 per share and (B) the Western Common Stock Price Percentage (as
    defined below) shall be less than the BKX Index Percentage (as defined
    below) and (ii) BKLA has delivered written notice to Western of its
    intention to terminate this Agreement within forty-eight (48) hours
    following the date of such event (it being understood that, if the
    circumstances set forth in clause (i) shall have occurred and BKLA fails to
    timely deliver the notice referred to in this clause (ii), BKLA shall have
    the right to terminate if any such event subsequently occurs and BKLA timely
    delivers such notice); PROVIDED, HOWEVER, that, if Western effects a stock
    dividend, reclassification, recapitalization, stock split, combination,
    exchange of shares or similar transaction after the date hereof and prior to
    the Effective Time, the provisions of this Section 8.01(g) shall be
    appropriately adjusted;
 
        As used in this Section 8.01(g), (w) "Western Common Stock Price
    Percentage" means the percentage determined by dividing the Ten Day Average
    Price by $42.61 (as such amount may be adjusted pursuant to the paragraph
    above); (x) "BKX Index Percentage " means the percentage determined by
    dividing (i) the product of (A) the Keefe Bank Index as of the date of
    determination times (B) .66 by (ii) the Keefe Bank Index as of the date
    hereof; (y) "Ten Day Average Price" means the average sales price per share
    of Western Common Stock for a Ten Day Period determined by averaging the
    last reported sales price on each trading day, and (z) "Ten Day Period"
    means any period of ten (10) consecutive trading days.
 
        (h)  ACQUISITION PROPOSAL.  This Agreement may be terminated by BKLA by
    written notice to Western if BKLA receives an Acquisition Proposal on terms
    and conditions which the BKLA Board determines, after receiving the advice
    of its outside counsel that to proceed with the Merger will violate the
    fiduciary duties of the BKLA Board to BKLA's shareholders in light of such
    Acquisition Proposal, to accept such proposal; provided, however, that BKLA
    shall not be entitled to terminate this Agreement pursuant to this Section
    8.01(h) unless it shall have provided Western with written notice of such a
    possible determination (which written notice will inform Western of the
    material terms and conditions of the proposal, including the identity of the
    proponent) not less than two business days prior to such determination.
 
    8.02  EFFECT OF TERMINATION AND ABANDONMENT.  In the event of termination of
this Agreement and the abandonment of the Merger pursuant to Section 8.01, no
party to this Agreement shall have any liability or further obligation to any
other party hereunder except as set forth in Section 8.03 and Section 9.01.
 
    8.03  TERMINATION FEE.
 
    (a) MATERIAL BREACH BY WESTERN. Should BKLA terminate this Agreement
pursuant to Section 8.01(b) (unless such breach under Section 8.01(b) shall
result from no act or omission of Western), Western shall promptly, if so
requested by BKLA, but in no event later than five business days after the date
of such request, pay BKLA a fee equal to BKLA's out-of-pocket expenses in
connection with this Agreement and the transactions contemplated hereby, up to a
maximum of $500,000, which amount shall be payable in same day funds, provided
however that no fee shall be paid pursuant to this Section 8.03(a) if BKLA shall
 
                                      A-27
<PAGE>
be in material breach of its obligations hereunder and Western shall owe no
further duty or liability on account of this Agreement to BKLA.
 
    (b) MATERIAL BREACH BY BKLA; ENTERING ACQUISITION PROPOSAL. Should Western
terminate this Agreement pursuant to either Section 8.01(e) or 8.01(b) (unless
such breach under Section 8.01(b) shall result from no act or omission of BKLA),
BKLA shall promptly, if so requested by Western, but in no event later than five
business days after the date of such request, pay Western a fee equal to
Western's out-of-pocket expenses in connection with this Agreement and the
transactions contemplated hereby, up to a maximum of $500,000, which amount
shall be payable in same day funds, provided however that no fee shall be paid
pursuant to this Section 8.03 if Western shall be in material breach of its
obligations hereunder and BKLA and the shareholders who are parties to the
Shareholder Agreements shall owe no further duty or liability on account of this
Agreement or the Shareholders Agreement to either Western or Santa Monica Bank.
In the event that there is a termination as a result of BKLA entering into an
Acquisition Proposal pursuant to Section 8.01(h), BKLA shall pay Western up to
$500,000 to cover out-of-pocket expenses in addition to Western's rights under
the Stock Option Agreement and BKLA and the shareholders who are parties to the
Shareholder Agreements shall owe no further duty or liability on account of this
Agreement to either Western or Santa Monica Bank except under the Stock Option
Agreement.
 
                                   ARTICLE IX
 
                                 MISCELLANEOUS
 
    9.01  SURVIVAL.  No representations, warranties, agreements and covenants
contained in this Agreement shall survive the Effective Time (other than
Sections 3.01, 3.03, 3.04, 3.07, 6.12 and this Article IX which shall survive
the Effective Time) or the termination of this Agreement if this Agreement is
terminated prior to the Effective Time (other than Sections 6.03(b), 6.05(b),
8.02, 8.03 and this Article IX which shall survive such termination).
 
    9.02  WAIVER; AMENDMENT.  Prior to the Effective Time, any provision of this
Agreement may be (i) waived by the party benefitted by the provision, or (ii)
amended or modified at any time, by an agreement in writing between the parties
hereto executed in the same manner as this Agreement, except that after the BKLA
Meeting, this Agreement may not be amended if it would violate the CGCL or
reduce the consideration to be received by BKLA shareholders in the Merger.
 
    9.03  COUNTERPARTS.  This Agreement may be executed in one or more
counterparts, each of which shall be deemed to constitute an original.
 
    9.04  GOVERNING LAW; WAIVER OF JURY TRIAL.  This Agreement shall be governed
by, and interpreted in accordance with, the laws of the State of California
applicable to contracts made and to be performed entirely within such State.
Each of the parties hereto hereby irrevocably waives any and all right to trial
by jury in any legal proceeding arising out of or related to this Agreement or
the transactions contemplated hereby.
 
    9.05  EXPENSES.  Each party hereto will bear all expenses incurred by it in
connection with this Agreement and the transactions contemplated hereby, except
as provided in Section 8.02.
 
                                      A-28
<PAGE>
    9.06  NOTICES.  All notices, requests and other communications hereunder to
a party shall be in writing and shall be deemed given if personally delivered,
telecopied (with machine-generated confirmation) or mailed by registered or
certified mail (return receipt requested) to such party at its address set forth
below or such other address as such party may specify by notice to the parties
hereto.
 
If to, to:
 
       Bank of Los Angeles
       8901 Santa Monica Blvd.
       West Hollywood, CA 90069-4901
       Attention: Adriana M. Boeka
       Facsimile: (310) 843-1498
 
With a copy to:
 
       Horgan, Rosen, Beckham & Coren
       21700 Oxnard Street
       Suite 1400
       Woodland Hills, CA 91367
       Attention: Arthur Coren
       Facsimile: (818) 340-6190
 
If to Western or Santa Monica Bank, to:
 
       Western Bancorp
       1251 Westwood Boulevard
       Los Angeles, CA 90024
       Attention: Matthew P. Wagner
       Facsimile: (310) 477-8611
 
With a copy to:
 
       Sullivan & Cromwell
       444 South Flower Street
       Los Angeles, California 90071
       Attention: Stanley F. Farrar
       Facsimile: (213) 683-0457
 
    9.07  ENTIRE UNDERSTANDING; NO THIRD PARTY BENEFICIARIES.  This Agreement,
the Stock Option Agreement, the Affiliate Agreements and the Shareholder
Agreements represent the entire understanding of the parties hereto with
reference to the transactions contemplated hereby and thereby and this Agreement
supersedes any and all other oral or written agreements heretofore made (other
than any such Stock Option Agreement, Affiliate Agreements or Shareholder
Agreements). Nothing in this Agreement expressed or implied, is intended to
confer upon any person, other than the parties hereto or their respective
successors, any rights, remedies, obligations or liabilities under or by reason
of this Agreement.
 
    9.08  INTERPRETATION; EFFECT.  When a reference is made in this Agreement to
Sections, Exhibits or Schedules, such reference shall be to a Section of, or
Exhibit or Schedule to, this Agreement unless otherwise indicated. The table of
contents and headings contained in this Agreement are for reference purposes
only and are not part of this Agreement. Whenever the words "include,"
"includes" or "including" are used in this Agreement, they shall be deemed to be
followed by the words "without limitation." No provision of this Agreement shall
be construed to require BKLA, Western or any of their respective Subsidiaries,
affiliates or directors to take any action which would violate applicable law
(whether statutory or common law), rule or regulation.
 
                                    *  *  *
 
                                      A-29
<PAGE>
    IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed in counterparts by their duly authorized officers, all as of the day
and year first above written.
 
<TABLE>
<S>                             <C>  <C>
                                BANK OF LOS ANGELES
 
                                By:  /s/ A. BOEKA
                                     -----------------------------------------
                                     Name:
                                     Title:
 
                                WESTERN BANCORP
 
                                By:  /s/ ARNOLD C. HAHN
                                     -----------------------------------------
                                     Name:
                                     Title:
 
                                SANTA MONICA BANK
 
                                By:  /s/ ARNOLD C. HAHN
                                     -----------------------------------------
                                     Name:
                                     Title:
</TABLE>
 
                                      A-30
<PAGE>
                                                                      APPENDIX B
 
            1000 WILSHIRE BOULEVARD, LOS ANGELES, CALIFORNIA 90017-2465
      MAILING ADDRESS: P.O. BOX 30014, LOS ANGELES, CALIFORNIA 90030-0014
 
[LOGO]
WEDBUSH MORGAN                                                    (213) 688-4545
SECURITIES                                                    FAX (213) 688-6642
      INVESTMENT BANKERS SINCE 1925
 
   
                                August 17, 1998
    
 
Board of Directors
Bank of Los Angeles
8901 West Santa Monica Blvd.
West Hollywood, CA 90069
 
Members of the Board:
 
   
We understand that Western Bancorp ("Western"), its wholly-owned subsidiary,
Santa Monica Bank ("Santa Monica"), and Bank of Los Angeles (the "Bank") have
entered into an Agreement and Plan of Merger, dated as of April 16, 1998 (the
"Agreement"), pursuant to which the Bank will be merged with and into Santa
Monica (the "Merger"), as a result of which each outstanding share of the Bank's
common stock (the "Bank of Los Angeles Shares") will be converted into 0.4224 of
a share (the "Exchange Ratio") of the common stock of Western (the "Western
Shares"). The terms and conditions of the Merger are set forth in more detail in
the Agreement.
    
 
   
You have asked us whether, in our opinion, the proposed Exchange Ratio in the
Merger is fair to the stockholders of the Bank from a financial point of view.
This opinion updates our written opinion to you dated April 15, 1998 concerning
the same subject matter.
    
 
   
Wedbush Morgan Securities is an investment banking firm and member of the New
York Stock Exchange and other principal stock exchanges in the United States,
and is regularly engaged as part of its business in the valuation of businesses
and their securities in connection with mergers and acquisitions, negotiated
underwritings, private placements, secondary distributions of listed and
unlisted securities, and valuations for corporate, estate and other purposes.
    
 
   
For purposes of this opinion and in connection with our review of the Merger, we
have reviewed and analyzed, among other things: (1) the Agreement and the
specific terms of the Merger, (2) certain publicly available business and
financial information relating to the Bank and Western that we deem to be
relevant, (3) certain internal information, primarily financial in nature,
including financial projections and other financial and operating data relating
to strategic implications and operational benefits anticipated to result from
the Merger, furnished to us by the Bank and Western, (4) certain publicly
available and other information concerning the trading of, and the trading
market for, the common stock of the Bank and Western, (5) certain publicly
available information with respect to other companies that we believe to be
comparable in certain respects to the Bank or Western, and (6) certain publicly
available information with respect to other merger and acquisition transactions
that we believe to be comparable in certain respects to the Merger. In addition,
we have held discussions with the managements of the Bank and Western concerning
their views as to the financial and other information described above and the
potential cost savings, operating synergies, revenue enhancements and strategic
benefits expected to result from the Merger. In addition to the foregoing, we
have conducted such other analyses and examinations and considered such other
financial, economic and market criteria as we deem appropriate to arrive at our
opinion.
    
 
                         MEMBER NEW YORK STOCK EXCHANGE
 
                                      B-1
<PAGE>
   
Board of Directors                                               August 17, 1998
Bank of Los Angeles                                                  Page 2 of 3
    
 
In arriving at our opinion, we have assumed and relied upon the accuracy and
completeness of all financial and other information provided to or reviewed by
us or publicly available, and we have not assumed any
 
   
responsibility for independent verification of any such information. With
respect to financial projections and other information provided to or reviewed
by us, we have been advised by the managements of the Bank and Western that such
projections and other information were reasonably prepared on bases reflecting
the best currently available estimates and judgments of the respective
managements of the Bank and Western as to the expected future financial
performance of the Bank and Western and the strategic implications and
operational benefits anticipated from the Merger, and we have assumed that,
after the Merger, Western and its subsidiaries will perform substantially in
accordance with such projections. We further relied on the assurances of
managements of the Bank and Western that they are unaware of any facts that
would make the information or projections provided to us incomplete or
misleading. In particular, we were provided with and relied upon a schedule
provided by Western of estimated synergies and related cost savings that the
Bank expects to achieve as a result of the Merger. With respect to pending legal
and regulatory proceedings involving the Bank or Western, we were not in a
position to evaluate the impact of such proceedings and we have assumed that
these matters will be resolved in a manner that will not adversely affect in any
material respect the financial projections on which we have relied for purposes
of our opinion. We have not made or been provided with any independent
evaluations or appraisals of any of the Bank's or Western's assets, properties,
liabilities or securities, nor have we made any physical inspection of the
properties or assets of the Bank or Western. We have assumed that Western will
account for the Merger as a pooling-of-interests in accordance with generally
accepted accounting principles ("GAAP"), and that the Merger qualifies for such
accounting treatment under GAAP. We have also assumed that the Merger will
constitute a "reorganization" within the meaning of Section 368(a) of the
Internal Revenue Code of 1986, as amended, and neither the Bank, Western, Santa
Monica nor holders of Bank of Los Angeles Shares will recognize gain or loss for
U.S. federal and state income tax purposes as a result of the Merger. We have
further assumed that all conditions to the Agreement will be satisfied and not
waived.
    
 
We are not experts in the evaluation of loan losses or reserves or allowances
therefor, and with your consent, we have not made an independent evaluation of
the adequacy of the reserve or allowance for loan losses of the Bank or Western,
nor have we reviewed any individual credit files relating to the Bank or
Western. Rather, with your consent, we have assumed that the aggregate reserve
or allowance for loan losses for each of the Bank and Western is adequate to
cover such losses and will be adequate after the Merger for Western and its
subsidiaries.
 
Our opinion as expressed below relates to the relative values of the Bank and
Western and does not imply any conclusion as to what the values of the Western
Shares actually will be when issued pursuant to the Merger or the price at which
such stock will trade following the consummation of the Merger. Our opinion
necessarily is based upon conditions and circumstances as they exist and can be
evaluated as of the date hereof and does not address the underlying business
decision of the Bank to enter into the Agreement or complete the Merger.
Specifically, we have not been asked to nor do we express an opinion as to the
relative merits of the Merger as compared to any alternative business strategies
that might exist for the Bank or the effect of any other transaction in which
the Bank might engage.
 
   
Our opinion is based on economic, market and other conditions as in effect on,
and the information made available to us as of, the date hereof. Events
occurring after the date hereof could materially affect the assumptions used in
preparing this opinion. We have not undertaken to reaffirm or revise this
opinion or otherwise comment upon any events occurring after the date hereof.
    
 
                                      B-2
<PAGE>
   
Board of Directors                                               August 17, 1998
Bank of Los Angeles                                                  Page 3 of 3
    
 
In the ordinary course of our business, we and our affiliates may actively trade
the common stock of the Bank and Western for our own account and for the
accounts of our customers and, accordingly, we may at any time hold a long or
short position in the common stock of the Bank or Western.
 
This opinion is for the benefit and use of the members of the Board of Directors
of the Bank in connection with their evaluation of the Merger and does not
constitute a recommendation to any holder of Bank of Los Angeles Shares as to
how such shareholder should vote with respect to the Merger. This opinion may
not be used for any other purpose without our prior written consent, except as
provided for in the engagement letter dated as of April 9, 1998 between the Bank
and Wedbush Morgan Securities.
 
Based upon and subject to the foregoing, it is our opinion that, as of the date
hereof, the Exchange Ratio in the Merger is fair to the shareholders of the Bank
from a financial point of view.
 
                                          Very truly yours,
                                          /s/ WEDBUSH MORGAN SECURITIES INC.
                                          WEDBUSH MORGAN SECURITIES INC.
 
                                      B-3
<PAGE>
                                                                      APPENDIX C
 
                               CORPORATIONS CODE
                             TITLE 1. CORPORATIONS
                      DIVISION 1. GENERAL CORPORATION LAW
                         CHAPTER 13. DISSENTERS' RIGHTS
 
   
    Section 1300.  Reorganization or short-form merger; dissenting shares;
corporate purchase at fair market value; definitions
    
 
    (a) If the approval of the outstanding shares (Section 152) of a corporation
is required for a reorganization under subdivisions (a) and (b) or subdivision
(e) or (f) of Section 1201, each shareholder of the corporation entitled to vote
on the transaction and each shareholder of a subsidiary corporation in a
short-form merger may, by complying with this chapter, require the corporation
in which the shareholder holds shares to purchase for cash at their fair market
value the shares owned by the shareholder which are dissenting shares as defined
in subdivision (b). The fair market value shall be determined as of the day
before the first announcement of the terms of the proposed reorganization or
short-form merger, excluding any appreciation or depreciation in consequence of
the proposed action, but adjusted for any stock split, reverse stock split, or
share dividend which becomes effective thereafter.
 
    (b) As used in this chapter, "dissenting shares" means shares which come
within all of the following descriptions:
 
        (1) Which were not immediately prior to the reorganization or short-form
    merger either (A) listed on any national securities exchange certified by
    the Commissioner of Corporations under subdivision (o) of Section 25100 or
    (B) listed on the list of OTC margin stocks issued by the Board of Governors
    of the Federal Reserve System, and the notice of meeting of shareholders to
    act upon the reorganization summarizes this section and Sections 1301, 1302,
    1303 and 1304; provided, however, that this provision does not apply to any
    shares with respect to which there exists any restriction on transfer
    imposed by the corporation or by any law or regulation; and provided,
    further, that this provision does not apply to any class of shares described
    in subparagraph (A) or (B) if demands for payment are filed with respect to
    5 percent or more of the outstanding shares of that class.
 
        (2) Which were outstanding on the date for the determination of
    shareholders entitled to vote on the reorganization and (A) were not voted
    in favor of the reorganization or, (B) if described in subparagraph (A) or
    (B) of paragraph (1) (without regard to the provisos in that paragraph),
    were voted against the reorganization, or which were held of record on the
    effective date of a short-form merger; provided, however, that subparagraph
    (A) rather than subparagraph (B) of this paragraph applies in any case where
    the approval required by Section 1201 is sought by written consent rather
    than at a meeting.
 
   
        (3) Which the dissenting shareholder has demanded that the corporation
    purchase at their fair market value, in accordance with Section 1301.
    
 
        (4) Which the dissenting shareholder has submitted for endorsement, in
    accordance with Section 1302.
 
    (c) As used in this chapter, "dissenting shareholder" means the recordholder
of dissenting shares and includes a transferee of record.
 
    Section 1301.  Notice to holders of dissenting shares in reorganizations;
demand for purchase; time; contents
 
   
    (a) If, in the case of a reorganization, any shareholders of a corporation
have a right under Section 1300, subject to compliance with paragraphs (3) and
(4) of subdivision (b) thereof, to require the
    
 
                                      C-1
<PAGE>
corporation to purchase their shares for cash, such corporation shall mail to
each such shareholder a notice of the approval of the reorganization by its
outstanding shares (Section 152) within 10 days after the date of such approval,
accompanied by a copy of Sections 1300, 1302, 1303, 1304 and this section, a
statement of the price determined by the corporation to represent the fair
market value of the dissenting shares, and a brief description of the procedure
to be followed if the shareholder desires to exercise the shareholder's right
under such sections. The statement of price constitutes an offer by the
corporation to purchase at the price stated any dissenting shares as defined in
subdivision (b) of Section 1300, unless they lose their status as dissenting
shares under Section 1309.
 
    (b) Any shareholder who has a right to require the corporation to purchase
the shareholder's shares for cash under Section 1300, subject to compliance with
paragraphs (3) and (4) of subdivision (b) thereof, and who desires the
corporation to purchase such shares shall make written demand upon the
corporation for the purchase of such shares and payment to the shareholder in
cash of their fair market value. The demand is not effective for any purpose
unless it is received by the corporation or any transfer agent thereof (1) in
the case of shares described in clause (i) or (ii) of paragraph (1) of
subdivision (b) of Section 1300 (without regard to the provisos in that
paragraph), not later than the date of the shareholders' meeting to vote upon
the reorganization, or (2) in any other case within 30 days after the date on
which the notice of the approval by the outstanding shares pursuant to
subdivision (a) or the notice pursuant to subdivision (i) of Section 1110 was
mailed to the shareholder.
 
    (c) The demand shall state the number and class of the shares held of record
by the shareholder which the shareholder demands that the corporation purchase
and shall contain a statement of what such shareholder claims to be the fair
market value of those shares as of the day before the announcement of the
proposed reorganization or short-form merger. The statement of fair market value
constitutes an offer by the shareholder to sell the shares at such price.
 
    Section 1302.  Submission of share certificates for endorsement;
uncertificated securities
 
    Within 30 days after the date on which notice of the approval by the
outstanding shares or the notice pursuant to subdivision (i) of section 1110 was
mailed to the shareholder, the shareholder shall submit to the corporation at
its principal office or at the office of any transfer agent thereof, (a) if the
shares are certificated securities, the shareholder's certificates representing
any shares which the shareholder demands that the corporation purchase, to be
stamped or endorsed with a statement that the shares are dissenting shares or to
be exchanged for certificates of appropriate denomination so stamped or endorsed
or (b) if the shares are uncertificated securities, written notice of the number
of shares which the shareholder demands that the corporation purchase. Upon
subsequent transfers of the dissenting shares on the books of the corporation,
the new certificates, initial transaction statement, and other written
statements issued therefor shall bear a like statement, together with the name
of the original dissenting holder of the shares.
 
    Section 1303.  Payment of agreed price with interest; agreement fixing fair
market value; filing; time of payment
 
    (a) If the corporation and the shareholder agree that the shares are
dissenting shares and agree upon the price of the shares, the dissenting
shareholder is entitled to the agreed price with interest thereon at the legal
rate on judgments from the date of the agreement. Any agreements fixing the fair
market value of any dissenting shares as between the corporation and the holders
thereof shall be filed with the secretary of the corporation.
 
    (b) Subject to the provisions of Section 1306, payment of the fair market
value of dissenting shares shall be made within 30 days after the amount thereof
has been agreed or within 30 days after any statutory or contractual conditions
to the reorganization are satisfied, whichever is later, and in the case of
certificated securities, subject to surrender of the certificates therefor,
unless provided otherwise by agreement.
 
                                      C-2
<PAGE>
    Section 1304.  Action to determine whether shares are dissenting shares or
fair market value; limitation; joinder; consolidation; determination of issues;
appointment of appraisers
 
    (a) If the corporation denies that the shares are dissenting shares, or the
corporation and the shareholder fail to agree upon the fair market value of the
shares, then the shareholder demanding purchase of such shares as dissenting
shares or any interested corporation, within six months after the date on which
notice of the approval by the outstanding shares (Section 152) or notice
pursuant to subdivision (i) of Section 1110 was mailed to the shareholder, but
not thereafter, may file a complaint in the superior court of the proper county
praying the court to determine whether the shares are dissenting shares or the
fair market value of the dissenting shares or both or may intervene in any
action pending on such a complaint.
 
    (b) Two or more dissenting shareholders may join as plaintiffs or be joined
as defendants in any such action and two or more such actions may be
consolidated.
 
    (c) On the trial of the action, the court shall determine the issues. If the
status of the shares as dissenting shares is in issue, the court shall first
determine that issue. If the fair market value of the dissenting shares is in
issue, the court shall determine, or shall appoint one or more impartial
appraisers to determine, the fair market value of the shares.
 
    Section 1305.  Report of appraisers; confirmation; determination by court;
judgment payment; appeal; costs
 
    (a) If the court appoints an appraiser or appraisers, they shall proceed
forthwith to determine the fair market value per share. Within the time fixed by
the court, the appraisers, or a majority of them, shall make and file a report
in the office of the clerk of the court. Thereupon, on the motion of any party,
the report shall be submitted to the court and considered on such evidence as
the court considers relevant. If the court finds the report reasonable, the
court may confirm it.
 
    (b) If a majority of the appraisers appointed fail to make and file a report
within 10 days from the date of their appointment or within such further time as
may be allowed by the court or the report is not confirmed by the court, the
court shall determine the fair market value of the dissenting shares.
 
    (c) Subject to the provisions of Section 1306, judgment shall be rendered
against the corporation for payment of an amount equal to the fair market value
of each dissenting share multiplied by the number of dissenting shares which any
dissenting shareholder who is a party, or who has intervened, is entitled to
require the corporation to purchase, with interest thereon at the legal rate
from the date on which judgment was entered.
 
    (d) Any such judgment shall be payable forthwith with respect to
uncertificated securities and, with respect to certificated securities, only
upon the endorsement and delivery to the corporation of the certificates for the
shares described in the judgment. Any party may appeal from the judgment.
 
    (e) The costs of the action, including reasonable compensation to the
appraisers to be fixed by the court, shall be assessed or apportioned as the
court considers equitable, but, if the appraisal exceeds the price offered by
the corporation, the corporation shall pay the costs (including in the
discretion of the court attorneys' fees, fees of expert witnesses and interest
at the legal rate on judgments from the date of compliance with Sections 1300,
1301 and 1302 if the value awarded by the court for the shares is more than 125
percent of the price offered by the corporation under subdivision (a) of Section
1301).
 
    Section 1306.  Prevention of immediate payment; status as creditors;
interest
 
    To the extent that the provisions of Chapter 5 prevent the payment to any
holders of dissenting shares of their fair market value, they shall become
creditors of the corporation for the amount thereof together with interest at
the legal rate on judgments until the date of payment, but subordinate to all
other creditors in any liquidation proceeding, such debt to be payable when
permissible under the provisions of Chapter 5.
 
                                      C-3
<PAGE>
    Section 1307.  Dividends on dissenting shares
 
    Cash dividends declared and paid by the corporation upon the dissenting
shares after the date of approval of the reorganization by the outstanding
shares (Section 152) and prior to payment for the shares by the corporation
shall be credited against the total amount to be paid by the corporation
therefor.
 
    Section 1308.  Rights of dissenting shareholders pending valuation;
withdrawal of demand for payment
 
    Except as expressly limited in this chapter, holders of dissenting shares
continue to have all the rights and privileges incident to their shares, until
the fair market value of their shares is agreed upon or determined. A dissenting
shareholder may not withdraw a demand for payment unless the corporation
consents thereto.
 
    Section 1309.  Termination of dissenting share and shareholder status
 
    Dissenting shares lose their status as dissenting shares and the holders
thereof cease to be dissenting shareholders and cease to be entitled to require
the corporation to purchase their shares upon the happening of any of the
following:
 
    (a) The corporation abandons the reorganization. Upon abandonment of the
reorganization, the corporation shall pay on demand to any dissenting
shareholder who has initiated proceedings in good faith under this chapter all
necessary expenses incurred in such proceedings and reasonable attorneys' fees.
 
    (b) The shares are transferred prior to their submission for endorsement in
accordance with Section 1302 or are surrendered for conversion into shares of
another class in accordance with the articles.
 
    (c) The dissenting shareholder and the corporation do not agree upon the
status of the shares as dissenting shares or upon the purchase price of the
shares, and neither files a complaint or intervenes in a pending action as
provided in Section 1304, within six months after the date on which notice of
the approval by the outstanding shares or notice pursuant to subdivision (i) of
Section 1110 was mailed to the shareholder.
 
    (d) The dissenting shareholder, with the consent of the corporation,
withdraws the shareholder's demand for purchase of the dissenting shares.
 
    Section 1310.  Suspension of right to compensation or valuation proceedings;
litigation of shareholders' approval
 
    If litigation is instituted to test the sufficiency or regularity of the
votes of the shareholders in authorizing a reorganization, any proceedings under
Sections 1304 and 1305 shall be suspended until final determination of such
litigation.
 
    Section 1311.  Exempt shares
 
    This chapter, except Section 1312, does not apply to classes of shares whose
terms and provisions specifically set forth the amount to be paid in respect to
such shares in the event of a reorganization or merger.
 
    Section 1312.  Right of dissenting shareholders to attack, set aside or
rescind merger or reorganization; restraining order or injunction; conditions
 
    (a) No shareholder of a corporation who has a right under this chapter to
demand payment of cash for the shares held by the shareholder shall have any
right at law or in equity to attack the validity of the reorganization or
short-form merger, or to have the reorganization or short-form merger set aside
or rescinded, except in an action to test whether the number of shares required
to authorize or approve the reorganization have been legally voted in favor
thereof; but any holder of shares of a class whose terms and provisions
specifically set forth the amount to be paid in respect to them in the event of
a reorganization or short-form merger is entitled to payment in accordance with
those terms and provisions or, if the principal
 
                                      C-4
<PAGE>
terms of the reorganization are approved pursuant to subdivision (b) of Section
1202, is entitled to payment in accordance with the terms and provisions of the
approved reorganization.
 
    (b) If one of the parties to a reorganization or short-form merger is
directly or indirectly controlled by, or under common control with, another
party to the reorganization or short-form merger, subdivision (a) shall not
apply to any shareholder of such party who has not demanded payment of cash for
such shareholder's shares pursuant to this chapter; but if the shareholder
institutes any action to attack the validity of the reorganization or short-form
merger or to have the reorganization or short-form merger set aside or
rescinded, the shareholder shall not thereafter have any right to demand payment
of cash for the shareholder's shares pursuant to this chapter. The court in any
action attacking the validity of the reorganization or short-form merger or to
have the reorganization or short-form merger set aside or rescinded shall not
restrain or enjoin the consummation of the transaction except upon 10 days'
prior notice to the corporation and upon a determination by the court that
clearly no other remedy will adequately protect the complaining shareholder or
the class of shareholders of which such shareholder is a member.
 
    (c) If one of the parties to a reorganization or short-form merger is
directly or indirectly controlled by, or under common control with, another
party to the reorganization or short-form merger, in any action to attack the
validity of the reorganization or short-form merger or to have the
reorganization or short-form merger set aside or rescinded, (1) a party to a
reorganization or short-form merger which controls another party to the
reorganization or short-form merger shall have the burden of proving that the
transaction is just and reasonable as to the shareholders of the controlled
party, and (2) a person who controls two or more parties to a reorganization
shall have the burden of proving that the transaction is just and reasonable as
to the shareholders of any party so controlled.
 
                                      C-5
<PAGE>
                           PLEASE SIGN AND DATE BELOW
 
    THE UNDERSIGNED HEREBY ACKNOWLEDGES RECEIPT OF THE NOTICE OF SPECIAL MEETING
AND PROXY STATEMENT-PROSPECTUS.
 
    THE BOARD OF DIRECTORS RECOMMENDS A VOTE OF "FOR" PROPOSAL 1. THE PROXY
CONFERS AUTHORITY TO AND SHALL BE VOTED "FOR" PROPOSAL 1 UNLESS "AGAINST" OR
"ABSTAIN" IS INDICATED, IN WHICH CASE THE PROXY SHALL BE VOTED IN ACCORDANCE
WITH SUCH INSTRUCTIONS.
 
    IF ANY OTHER BUSINESS IS PRESENTED AT THE SPECIAL MEETING, THIS PROXY SHALL
BE VOTED IN ACCORDANCE WITH THE RECOMMENDATIONS OF A MAJORITY OF THE BOARD OF
DIRECTORS.
    Please sign exactly as name appears on stock certificates. When shares are
held by joint tenants, both should sign. When signing as attorney, executor,
administrator, trustee or guardian, please sign in full corporate name by
president or other authorized officer. If a partnership, please sign in
partnership name by authorized person.
 
<TABLE>
<CAPTION>
<S>                                               <C>
 
Number of Shares -----------------------------    Date: ----------------------------------------
                                                   ----------------------------- Signature
                                                  ----------------------------- Signature,
                                                   if held jointly.
                                                   I (we) do [  ] do not [  ] expect to attend the
                                                   Special Meeting.
                                                   Number of persons-----------------------------
</TABLE>
 
PLEASE MARK, DATE AND SIGN THIS PROXY, AND RETURN IT PROMPTLY USING THE ENCLOSED
                                RETURN ENVELOPE.
<PAGE>
                                REVOCABLE PROXY
                              BANK OF LOS ANGELES
              SPECIAL MEETING OF SHAREHOLDERS--SEPTEMBER 23, 1998
    The undersigned shareholder(s) of Bank of Los Angeles ("BKLA") hereby
nominates, constitutes and appoints Adriana M. Boeka, Roy Doumani, and James V.
Reimann, each of them, the attorney, agent, and proxy of the undersigned, with
full power of substitution, to vote all stock of BKLA which the undersigned is
entitled to vote at the special meeting of Shareholders (the "Special Meeting")
of BKLA, to be held in lieu of an annual meeting, at BKLA's Beverly Hills
branch, 9601 Wilshire Boulevard, Beverly Hills, California 90210 on September
23, 1998, at 5:30 p.m., and any and all adjournments thereof ("the "Meeting"),
as fully and with the same force and effect as the undersigned might or could do
if personally present thereat, in the manner indicated below on any other
matters properly brought before the Special Meeting or any adjournments thereof,
as set forth in the Proxy Statement-Prospectus as follows:
    Please mark your choice in the / / in blue or black ink.
    1.  To consider and vote on a proposal to approve the principal terms of the
       proposed merger of BKLA with and into Santa Monica Bank, a wholly-owned
       subsidiary of Western Bancorp ("Western") pursuant to the Agreement and
       Plan of Merger.
 
<TABLE>
<S>                       <C>                       <C>
/ /  FOR                  / /  AGAINST              / /  ABSTAIN
</TABLE>
 
    2.  To set the number of directors at nine, and consider and approve the
       election of nine persons to the BKLA Board of Directors to serve until
       the Merger is consummated or, if the Merger is not consummated, until the
       1998 Annual Meeting of Shareholders at which their successors will be
       elected and duly qualified. The following persons are the nominees:
    / / FOR all nominees listed below (except as marked to the contrary below),
        including discretionary authority to cumulate votes.
    / / WITHHOLD AUTHORITY to vote for all nominees listed below
INSTRUCTION: TO WITHHOLD AUTHORITY TO VOTE FOR ANY INDIVIDUAL NOMINEE, MARK THE
                     BOX NEXT TO THE NOMINEE'S NAME BELOW.)
 
<TABLE>
<S>                       <C>                       <C>
/ /  Adriana M. Boaka     / /  John J. Feldman      / /  James V. Reimann
/ /  Mary Anne Chalker    / /  Rickey M. Gelb       / /  Melvin F. Shaw
/ /  Roy Doumani          / /  John R. Newhouse     / /  Burton N. Sterman
</TABLE>
 
    3.  To ratify the appointment of Vavrinek, Trine, Day & Co. ("Vavrinek") as
       BKLA's independent public accountants, for the fiscal year ending
       December 31, 1998 should the Merger not be consummated.
 
<TABLE>
<S>                       <C>                       <C>
/ /  FOR                  / /  AGAINST              / /  ABSTAIN
</TABLE>
 
    4.  To transact such other business as may properly come before the Special
       Meeting or any postponement or adjournment thereof.
       THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS AND MAY BE
                            REVOKED PRIOR TO ITS EXERCISE.
                         PLEASE SIGN AND DATE ON REVERSE SIDE.
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 20. INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
    Section 317 of the CGCL authorizes a court to award, or a corporation's
Board of Directors to grant, indemnity to directors, officers and employees in
terms sufficiently broad to permit such indemnification under certain
circumstances for liabilities (including reimbursement for expenses incurred)
arising under the Securities Act. Article Six of Western's Restated Articles of
Incorporation and Article VI of Western's Restated Bylaws provide for
indemnification of its directors, officers, employees and other agents to the
fullest extent permitted by the CGCL.
 
ITEM 21. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.
 
    (a) Exhibits
 
   
<TABLE>
<CAPTION>
 EXHIBITS    DESCRIPTION AND METHOD OF FILING
- -----------  --------------------------------------------------------------------------------------------------------
<C>          <S>
       2.1   Agreement and Plan of Merger, dated as of April 16, 1998, and amended and restated as of June 24, 1998
               and July 16, 1998, by and among Western, Santa Monica Bank and BKLA (incorporated by reference to
               Appendix A to this Registration Statement on Form S-4)
 
       4.1   Form of Certificate representing shares of Western Common Stock (incorporated by reference to Exhibit 4
               to the Registrant's Current Report on Form 8-K, dated June 19, 1997)
 
       5.1   Opinion of Julius G. Christensen
 
       8.1   Tax Opinion of Sullivan & Cromwell
 
       8.2   Tax Opinion of Vavrinek, Trine, Day & Co., LLP
 
       9.1   Shareholder Agreement, dated as of April 16, 1998, by and among Adriana M. Boeka and Bank of Los Angeles
 
       9.2   Shareholder Agreement, dated as of April 16, 1998, by and among Maurice J. Burford and Bank of Los
               Angeles
 
       9.3   Shareholder Agreement, dated as of April 16, 1998, by and among Mary Anne Chalker and Bank of Los
               Angeles
 
       9.4   Shareholder Agreement, dated as of April 16, 1998, by and among Roy Doumani and Bank of Los Angeles
 
       9.5   Shareholder Agreement, dated as of April 16, 1998, by and among John J. Feldman and Bank of Los Angeles
 
       9.6   Shareholder Agreement, dated as of April 16, 1998, by and among Rickey Gelb and Bank of Los Angeles
 
       9.7   Shareholder Agreement, dated as of April 16, 1998, by and among Robert G. Jacobsen and Bank of Los
               Angeles
 
       9.8   Shareholder Agreement, dated as of April 16, 1998, by and among Wendy R. Moskal and Bank of Los Angeles
 
       9.9   Shareholder Agreement, dated as of April 16, 1998, by and among John R. Newhouse and Bank of Los Angeles
 
       9.10  Shareholder Agreement, dated as of April 16, 1998, by and among James V. Reimann and Bank of Los Angeles
</TABLE>
    
 
                                      II-1
<PAGE>
   
<TABLE>
<CAPTION>
 EXHIBITS    DESCRIPTION AND METHOD OF FILING
- -----------  --------------------------------------------------------------------------------------------------------
<C>          <S>
       9.11  Shareholder Agreement, dated as of April 16, 1998, by and among Melvin F. Shaw and Bank of Los Angeles
 
       9.12  Shareholder Agreement, dated as of April 16, 1998, by and among Burton N. Sterman and Bank of Los
               Angeles
 
      10.1   Agreement and Plan of Merger, dated as of July 24, 1998, by and among Western, Portola Merger Sub and
               Peninsula.
 
      23.1   Consent of KPMG Peat Marwick LLP
 
      23.2   Consent of Vavrinek, Trine, Day & Co., LLP (BKLA)
 
      23.3   Consent of Deloitte & Touche LLP (Santa Monica Bank)
 
      23.4   Consent of Deloitte & Touche LLP (SC Bancorp)
 
      23.5   Consent of Deloitte & Touche LLP (California Commercial Bankshares)
 
      23.6   Consent of Julius G. Christensen (included in opinion filed as Exhibit 5.1 hereto)
 
      23.7   Consent of Sullivan & Cromwell for Tax Opinion that is filed as Exhibit 8.1 hereto
 
      23.8   Consent of Vavrinek, Trine, Day & Co., LLP for Tax Opinion that is filed as Exhibit 8.2 hereto
 
      23.9   Consent of Vavrinek, Trine, Day & Co., LLP (Monarch Bancorp)
 
      23.10  Consent of Arthur Andersen LLP (Santa Monica Bank)
 
      24.1   Power of Attorney (set forth on Page II-4 in Registration Statement No. 333-57759)
 
      99.1   Consent of Wedbush
 
      99.2   Form of Letter of Transmittal
 
      99.3*  Consent of Adriana M. Boeka, proposed Western director
</TABLE>
    
 
   
*   Previously filed.
    
 
ITEM 22. UNDERTAKINGS.
 
    (a) The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
registrant's annual report pursuant to Section 13(a) or 15(d) of the Securities
Exchange Act of 1934 (and, where applicable, each filing of an employee benefit
plan's annual report pursuant to Section 15(d) of the Securities Exchange Act of
1934) that is incorporated by reference in the registration statement shall be
deemed to be a new registration statement relating to the securities offered
therein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.
 
    (b) The undersigned registrant hereby undertakes to deliver or cause to be
delivered with the prospectus, to each person to whom the prospectus is sent or
given, the latest annual report to security holders that is incorporated by
reference in the prospectus and furnished pursuant to and meeting the
requirements of Rule 14a-3 or Rule 14c-3 under the Securities Exchange Act of
1934; and, where interim financial information required to be presented by
Article 3 of Regulation S-X is not set forth in the prospectus, to deliver, or
cause to be delivered to each person to whom the prospectus is sent or given,
the latest quarterly report that is specifically incorporated by reference in
the prospectus to provide such interim financial information.
 
    (c) The undersigned registrant hereby undertakes as follows: that prior to
any public reoffering of the securities registered hereunder through use of a
prospectus which is a part of this registration statement, by any person or
party who is deemed to be an underwriter within the meaning of Rule 145(c),
 
                                      II-2
<PAGE>
the issuer undertakes that such reoffering prospectus will contain the
information called for by the applicable registration form with respect to
reofferings by persons who may be deemed underwriters, in addition to the
information called for by the other items of the applicable form.
 
    (d) The registrant undertakes that every prospectus: (i) that is filed
pursuant to paragraph (c) immediately preceding, or (ii) that purports to meet
the requirements of Section 10(a)(3) of the Act and is used in connection with
an offering of securities subject to Rule 415, will be filed as a part of an
amendment to the registration statement and will not be used until such
amendment is effective, and that, for purposes of determining any liability
under the Securities Act of 1933, each such post-effective amendment shall be
deemed to be a new registration statement relating to the securities offered
therein, and the offering of such securities at that time shall be deemed to be
the initial BONA FIDE offering thereof.
 
    (e) Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors, officers and controlling persons of
the registrant pursuant to the provisions described under Item 20 above, or
otherwise, the registrant has been advised that in the opinion of the Securities
and Exchange Commission such indemnification is against public policy as
expressed in the Act and is, therefore, unenforceable. In the event that a claim
for indemnification against such liabilities (other than the payment by the
registrant of expenses incurred or paid by a director, officer or controlling
person of the registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.
 
    (f) The undersigned registrant hereby undertakes to respond to requests for
information that is incorporated by reference into the prospectus pursuant to
Item 4, 10(b), 11 or 13 of this form, within one business day of receipt of such
request, and to send the incorporated documents by first class mail or other
equally prompt means. This includes information contained in documents filed
subsequent to the effective date of the registration statement through the date
of responding to the request.
 
    (g) The undersigned registrant hereby undertakes to supply by means of a
post-effective amendment all information concerning a transaction, and the
company being acquired involved therein, that was not the subject of and
included in the registration statement when it became effective.
 
                                      II-3
<PAGE>
                                   SIGNATURES
 
   
    Pursuant to the requirements of the Securities Act of 1933, the registrant
has duly caused this Amendment No. 1 to the Registration Statement to be signed
on its behalf by the undersigned, thereunto duly authorized, in the city of
Newport Beach, State of California, on August 13, 1998.
    
 
<TABLE>
<S>                             <C>  <C>
                                WESTERN BANCORP
 
                                By:  /s/ ARNOLD C. HAHN
                                     -----------------------------------------
                                     Name:  Arnold C. Hahn
                                     Title:   Executive Vice President and
                                              Chief Financial Officer
</TABLE>
 
   
    Pursuant to the requirements of the Securities Act of 1933, this Amendment
No. 1 to the Registration Statement has been signed by the following persons in
the capacities and on the dates indicated.
    
 
   
<TABLE>
<CAPTION>
          SIGNATURE                      CAPACITY                  DATE
- ------------------------------  --------------------------  -------------------
 
<S>                             <C>                         <C>
   /s/ HUGH S. SMITH, JR.*
- ------------------------------    Chairman and Director       August 13, 1998
      Hugh S. Smith, Jr.
 
      /s/ ARNOLD C. HAHN         Executive Vice President
- ------------------------------     and Chief Financial        August 13, 1998
        Arnold C. Hahn                   Officer
 
    /s/ MATTHEW P. WAGNER*
- ------------------------------   Chief Executive Officer,     August 13, 1998
      Matthew P. Wagner           President and Director
 
    /s/ AUBREY L. AUSTIN*
- ------------------------------           Director             August 13, 1998
       Aubrey L. Austin
 
      /s/ RICE E. BROWN*
- ------------------------------           Director             August 13, 1998
        Rice E. Brown
</TABLE>
    
 
                                      II-4
<PAGE>
   
<TABLE>
<CAPTION>
          SIGNATURE                      CAPACITY                  DATE
- ------------------------------  --------------------------  -------------------
 
<S>                             <C>                         <C>
    /s/ JOHN M. EGGEMEYER*
- ------------------------------           Director             August 13, 1998
      John M. Eggemeyer
 
  /s/ WILLIAM C. GREENBECK*
- ------------------------------           Director             August 13, 1998
     William C. Greenbeck
 
     /s/ ROBERT L. MCKAY*
- ------------------------------           Director             August 13, 1998
       Robert L. McKay
 
    /s/ MARK H. STUENKEL*
- ------------------------------           Director             August 13, 1998
       Mark H. Stuenkel
 
     /s/ DALE E. WALTER*
- ------------------------------           Director             August 13, 1998
        Dale E. Walter
</TABLE>
    
 
- ------------------------
 
   
*   Signed by Arnold C. Hahn as attorney-in-fact pursuant to a power of
    attorney, dated June 25, 1998, included on the signature page to a
    Registration Statement (File No. 333-40611) filed on June 26, 1998.
    
 
                                      II-5
<PAGE>
                                 EXHIBIT INDEX
 
   
<TABLE>
<CAPTION>
 EXHIBITS    DESCRIPTION AND METHOD OF FILING
- -----------  --------------------------------------------------------------------------------------------------------
<C>          <S>
       2.1   Agreement and Plan of Merger, dated as of April 16, 1998, and amended and restated as of June 24, 1998
               and July 16, 1998, by and among Western, Santa Monica Bank and BKLA (incorporated by reference to
               Appendix A to this Registration Statement on Form S-4)
 
       4.1   Form of Certificate representing shares of Western Common Stock (incorporated by reference to Exhibit 4
               to the Registrant's Current Report on Form 8-K, dated June 19, 1997)
 
       5.1   Opinion of Julius G. Christensen
 
       8.1   Tax Opinion of Sullivan & Cromwell
 
       8.2   Tax Opinion of Vavrinek, Trine, Day & Co., LLP
 
       9.1   Shareholder Agreement, dated as of April 16, 1998, by and among Adriana M. Boeka and Bank of Los Angeles
 
       9.2   Shareholder Agreement, dated as of April 16, 1998, by and among Maurice J. Burford and Bank of Los
               Angeles
 
       9.3   Shareholder Agreement, dated as of April 16, 1998, by and among Mary Anne Chalker and Bank of Los
               Angeles
 
       9.4   Shareholder Agreement, dated as of April 16, 1998, by and among Roy Doumani and Bank of Los Angeles
 
       9.5   Shareholder Agreement, dated as of April 16, 1998, by and among John J. Feldman and Bank of Los Angeles
 
       9.6   Shareholder Agreement, dated as of April 16, 1998, by and among Rickey Gelb and Bank of Los Angeles
 
       9.7   Shareholder Agreement, dated as of April 16, 1998, by and among Robert G. Jacobsen and Bank of Los
               Angeles
 
       9.8   Shareholder Agreement, dated as of April 16, 1998, by and among Wendy R. Moskal and Bank of Los Angeles
 
       9.9   Shareholder Agreement, dated as of April 16, 1998, by and among John R. Newhouse and Bank of Los Angeles
 
       9.10  Shareholder Agreement, dated as of April 16, 1998, by and among James V. Reimann and Bank of Los Angeles
 
       9.11  Shareholder Agreement, dated as of April 16, 1998, by and among Melvin F. Shaw and Bank of Los Angeles
 
       9.12  Shareholder Agreement, dated as of April 16, 1998, by and among Burton N. Sterman and Bank of Los
               Angeles
 
      10.1   Agreement and Plan of Merger, dated as of July 24, 1998, by and among Western, Portola Merger Sub and
               Peninsula.
 
      23.1   Consent of KPMG Peat Marwick LLP
 
      23.2   Consent of Vavrinek, Trine, Day & Co., LLP (BKLA)
 
      23.3   Consent of Deloitte & Touche LLP (Santa Monica Bank)
 
      23.4   Consent of Deloitte & Touche LLP (SC Bancorp)
 
      23.5   Consent of Deloitte & Touche LLP (California Commercial Bankshares)
 
      23.6   Consent of Julius G. Christensen (included in opinion filed as Exhibit 5.1 hereto)
 
      23.7   Consent of Sullivan & Cromwell for Tax Opinion that is filed as Exhibit 8.1 hereto
</TABLE>
    
<PAGE>
   
<TABLE>
<CAPTION>
 EXHIBITS    DESCRIPTION AND METHOD OF FILING
- -----------  --------------------------------------------------------------------------------------------------------
<C>          <S>
      23.8   Consent of Vavrinek, Trine, Day & Co., LLP for Tax Opinion that is filed as Exhibit 8.2 hereto
 
      23.9   Consent of Vavrinek, Trine, Day & Co., LLP (Monarch Bancorp)
 
      23.10  Consent of Arthur Andersen LLP (Santa Monica Bank)
 
      24.1   Power of Attorney (set forth on Page II-4 in Registration Statement No. 333-57759)
 
      99.1   Consent of Wedbush
 
      99.2   Form of Letter of Transmittal
 
      99.3*  Consent of Adriana M. Boeka, proposed Western director
</TABLE>
    
 
- ------------------------
 
   
* Previously filed.
    

<PAGE>

                                                                     EXHIBIT 5.1




   
                                                                  June 24, 1998
    

Western Bancorp,
  4100 Newport Place, Suite 900,
     Newport Beach, California  92660.

Ladies and Gentlemen:

     In connection with the registration under the Securities Act of 1933, as
amended (the "Act"), of 2,425,033 shares (the "Securities") of Common Stock,
without par value, of Western Bancorp, a California corporation (the "Company"),
I, as General Counsel of the Company, have examined such corporate records,
certificates and other documents, and such questions of law, as I have
considered necessary or appropriate for the purpose of this opinion.  Upon the
basis of such examination, I advise you that, in my opinion, when the
registration statement on Form S-4 relating to the Securities (the "Registration
Statement") has become effective under the Act and the Securities have been duly
issued and sold as contemplated by the Registration Statement and upon
consummation of the merger of Bank of Los Angeles with and into Santa Monica
Bank, a wholly-owned subsidiary of the Company, the Securities will be validly
issued, fully paid and nonassessable.

     The foregoing opinion is limited to the Federal laws of the United States
and the laws of the State of California, and I am expressing no opinion as to
the effect of the laws of any other jurisdiction. 

     I have relied as to certain matters on information obtained from public
officials and other sources believed by me to be responsible.

     I hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to the reference to me under the heading "Validity of
Western Common Stock" in the Proxy Statement-Prospectus contained in the
Registration Statement.  In giving such consent, I do not thereby admit that I
am in the category of persons whose consent is required under Section 7 of the
Act.

                                        Very truly yours,
   
                                        /s/ JULIUS G. CHRISTENSEN
                                        -------------------------
                                        Julius G. Christensen,
                                        Executive Vice President
                                        General Counsel and Secretary
    

<PAGE>

                                                                EXHIBIT 8.1 

                    [LETTERHEAD OF SULLIVAN & CROMWELL]

                                                             August 7, 1997

Western Bancorp
     4100 Newport Place, Suite 900,
          Newport Beach, California 92660.

Ladies and Gentlemen:

     We have acted as tax counsel to Western Bancorp, a California corporation
("Western"), in connection with the merger (the "Merger") of Bank of Los
Angeles, a California corporation ("BKLA"), with and into Santa Monica Bank, a
California banking corporation and wholly-owned subsidiary of Western ("SMB"),
pursuant to the Second Amended and Restated Agreement and Plan of Merger, dated
as of July 16, 1998, by and among Western, SMB, and BKLA (the "Merger
Agreement").  Unless otherwise indicated, capitalized terms used herein have the
meanings given to such terms in the Registration Statement on Form S-4
(Registration No. 333-57759) filed with the Securities and Exchange Commission
on August 11, 1998 (the "Registration Statement").

     For purposes of this opinion, we have reviewed the Merger Agreement and
such other documents and matters of law and fact as we have considered necessary
or appropriate, and we have assumed with your consent that: (i) the Merger will
be completed in the manner set forth in the Merger Agreement and

<PAGE>

                                                                             -2-

the Registration Statement; and (ii) the representations contained in the
letters of representation from Western and BKLA, both dated August 7, will be
true and complete at the Effective Time.

     Based upon and subject to the foregoing, and our consideration of such
other matters of fact and law as we have considered necessary or appropriate, it
is our opinion under presently applicable United States Federal income tax law
that:

          1.   The Merger will constitute a reorganization within the meaning of
     Section 368(a) of the Internal Revenue Code of 1986, as amended (the
     "Code").

          2.   No gain or loss will be recognized by Western, SMB or BKLA as a
     result of the Merger.

          3.   Except to the extent of any cash received in lieu of a fractional
     share interest in Western Common Stock, no gain or loss will be recognized
     by shareholders of BKLA Common Stock who exchange their BKLA Common Stock
     for Western Common Stock pursuant to the Merger.

The tax consequences described above may not be applicable to BKLA stockholders
that acquired the stock of BKLA pursuant to the exercise of an employee stock
option or right or otherwise as compensation, that hold BKLA stock as part of a
"straddle" or "conversion transaction" or that are insurance companies,

<PAGE>

                                                                             -3-

securities dealers, financial institutions, persons required to use a 
mark-to-market method of accounting with respect to shares of BKLA Common 
Stock or foreign persons.

     We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and all amendments thereto.  In giving such consent, we
do not thereby admit that we are in the category of persons whose consent is
required under Section 7 of the Securities Act of 1933.

                                             Very truly yours,

                                             /s/ Sullivan & Cromwell

<PAGE>

                                                                   EXHIBIT 8.2

                      [LETTERHEAD OF VAVRINEK, TRINE, DAY & CO.]

                                    August 7, 1998

Bank of Los Angeles
8901 Santa Monica Boulevard
West Hollywood, CA 90069

Gentlemen:

You have requested our opinion regarding certain federal income tax 
consequences of the proposed merger of Bank of Los Angeles ("Target") with 
and into Santa Monica Bank ("Sub").

                                        FACTS

Western Bancorp, a corporation organized in California ("Parent"), is the 
parent corporation of Santa Monica Bank ("Sub"), also a California 
corporation through which Parent engages in the business of general 
commercial banking.  Parent does not directly engage in the business of 
general commercial banking but instead does so indirectly as the holding 
company for Sub.  Neither Parent nor any person related to Parent owns, or 
immediately prior to the merger will own, any stock of Target.

Target is a California corporation.  Target engages in the business of general
commercial banking.

The terms of the proposed merger (the "Merger") are contained in (i) the
Agreement and Plan of Merger dated as of April 16, 1998 (the "Merger Agreement")
and (ii) amended and restated as of July 16, 1998, pursuant to which Target will
merge with and into Sub.

Terms not otherwise defined in this letter shall have the meanings assigned to
them in the Merger Agreement.

You have directed us to assume in preparing this opinion that (1) the Merger 
will be consummated in accordance with the terms, conditions and other 
provisions of the Merger Agreement, and (2) all of the factual information, 
descriptions, representations and assumptions set forth in this letter, in 
the Merger Agreement, in the letters to us from Acquiring dated August 10, 
1998, and from Target dated August 10, 1998 (the "Letters"), and in the Proxy 
Statement/Prospectus dated August 17, 1998, and mailed to Target shareholders 
in connection with the special meeting of shareholders to approve the Merger, 
are accurate and complete and will be accurate and complete at the time the 
Merger becomes effective (the "Effective Date").  We have not independently 
verified any factual matters relating to the Merger with or apart from our 
preparation of this opinion and, accordingly, our opinion does not take into 
account any matters not set forth herein which might have been disclosed by 
independent verification.

<PAGE>

Page 2


The Merger Agreement provides that Target will be merged with and into Sub
in accordance with the applicable provisions of the General Corporation Law of
the State of California and the California Financial Code.  The Merger must be
approved as required by law by the Target shareholders at a special meeting to
be held on September 23, 1998.

On the Effective Date, all assets and liabilities of Target will be 
transferred by operation of law to Sub, the separate corporate existence of 
Target will cease, and, except as provided below, each share of Target Common 
Stock then outstanding will be converted into .4224 share of Parent Common 
Stock.  In the event Parent changes (or establishes a record date for 
changing) the number of shares of Parent Common Stock issued and outstanding 
prior to the Effective Date as a result of a stock split, stock dividend, 
recapitalization or similar transaction with respect to the outstanding 
Parent Common Stock and the record date therefor shall be prior to the 
Effective Date, the Exchange Ratio shall be proportionately adjusted.

No fractional shares of Parent Common Stock will be issued in the Merger. 
Each holder of Target Common Stock, who otherwise would be entitled to 
receive a fraction of a share of Parent Common Stock, will receive instead, 
cash equal to such fraction multiplied by the Parent Stock Price. Except for 
cash paid to dissenters and cash exchanged in lieu of issuing fractional 
shares of Parent Common Stock, no cash will be exchanged for shares of Target 
Common Stock or shares of Parent Common Stock pursuant to the Merger.

On the Effective Date, Target's obligations with respect to stock options, 
warrants or other rights granted under the Stock Option Plan shall be assumed 
by Parent and each option, warrant or other right outstanding thereunder 
shall become the right to receive, upon payment of the exercise price, that 
number of shares of Parent Common Stock equal to the product of the Exchange 
Ratio and the number of shares of Target Common Stock covered by the option, 
warrant or other right.  Notwithstanding the preceding sentence, a holder of 
an option, warrant or other right who, upon exercise of the option, warrant 
or other right and the payment of the full exercise price thereof, would be 
entitled to receive a fraction of a share of Parent Common Stock, shall 
receive, in lieu thereof, cash in an amount equal to the fractional part of a 
share of Parent Common Stock multiplied by the Parent Stock Price.

Except for the options issued pursuant to the Stock Option Plan and the Option
Agreement, no options to purchase Target Common Stock and no securities or other
instruments convertible into Target Common Stock will be outstanding on the
Effective Date.

We have also relied with your permission on the following additional
representations and/or assumptions:

     1.   The Merger will be a statutory merger in accordance with the
          applicable provisions of the General Corporation Law of the State of
          California and the California Financial Code.
<PAGE>

Page 3


     2.   The fair market value of the Parent Common Stock and other
          consideration received by each Target shareholder will be
          approximately equal to the fair market value of the Target Common
          Stock surrendered in the exchange.

     3.   Target has not (and, as of the Effective Date, will not have)
          redeemed, and no person related (within the meaning of Treasury
          Regulation Section 1.368-1(e)(3)) to Target has (or, as of the
          Effective Date, will have) acquired, any stock of Target (1) within
          one year prior to the Effective Date, or, (2) as part of a plan which
          includes the Merger.

     4.   Parent has no plan or intention to reacquire, and no person related
          (within the meaning of Treasury Regulation Section 1.368-1(e)(3)) to
          Parent has any intention to acquire, any of the Parent Common
          Stock to be issued in the Merger.

     5.   Except as provided in the next sentence, Parent, Target and the
          shareholders of Target will pay their respective expenses, if any,
          incurred in connection with the Merger.  Sub will pay or assume
          only those expenses of Target that are solely and directly related to
          the Merger in accordance with the guidelines established in Rev. Rul.
          73-54, 1973-1 C.B.187.

     6.   There is no intercorporate indebtedness existing between Sub and
          Target that was issued, acquired or will be settled at a discount.

     7.   No two parties to the Merger are investment companies as defined in
          section 368(a)(2)(F)(iii) and (iv).

     8.   Target is not under the jurisdiction of a court in a title 11 or
          similar case within the meaning of section 368(a)(3)(A).

     9.   The fair market value of the assets of Target transferred to Sub
          will equal or exceed the sum of the liabilities assumed by Sub
          plus the amount of liabilities, if any, to which the transferred
          assets are subject.

    10.   Except as described in the Proxy Statement/Prospectus, no dividends or
          distributions, other than regular or normal dividends or
          distributions, will be made with respect to any Target stock prior to
          the Merger.  After the Merger, no dividends or distributions will be
          made to the former Target shareholders by Parent, other than
          regular or normal dividend distributions made with regard to all
          shares of Parent Common Stock.

<PAGE>

Page 4


     11.  None of the compensation received by any shareholder-employees of
          Target will be separate consideration for, or allocable to, any of
          their shares of Target Common Stock.  The compensation paid to any
          shareholder-employees of Target will be for services actually rendered
          and will be commensurate with amounts paid to third parties bargaining
          at arm's length for similar services.  None of the Parent Common
          Stock received by any shareholder-employee of Target will be in
          exchange for, or in consideration of, services rendered to Sub,
          Target or any other entity by such shareholder-employee.

     12.  The payment of cash in lieu of fractional shares of Parent Common
          Stock is solely for the purpose of avoiding the expense and
          inconvenience to Parent of issuing fractional shares and does not
          represent separately bargained-for consideration.  In addition, this
          cash payment will not be made pro rata either to all Target
          shareholders or to all Target and Parent shareholders.  The total
          cash consideration that will be paid in the Merger to Target
          shareholders in lieu of issuing fractional shares of Parent Common
          Stock will not exceed one percent of the total consideration that will
          be issued in the Merger to the Target shareholders in exchange for
          their shares of Target Common Stock.  The fractional share interests 
          of each Target shareholder will be aggregated, and no Target 
          shareholder will receive cash in an amount equal to or greater than 
          the value of one full share of Parent Common Stock.

     13.  The Target shareholders that will receive cash in lieu of fractional
          shares of Parent Common Stock will not have control of Parent,
          for purposes of section 302(b)(1), following the Merger.

     14.  The Merger is being effected for bona fide business reasons as
          described in the Proxy Statement/Prospectus.

     15.  Prior to the Merger, Target will not sell or otherwise dispose of any
          of its assets, except for dispositions made in the ordinary course of
          business or transfers described in section 368(a)(2)(C) or Treasury
          Regulation Section 1.368-2(k).

     16.  Sub has no plan or intention to sell or otherwise dispose of any of
          the assets of Target to be acquired in the Merger, except for
          dispositions made in the ordinary course of business or transfers
          described in Section 368(a)(2)(C) or Treasury Regulation Section
          1.368-2(k).

     17.  Prior to the Merger, Target will continue its historic businesses and
          will use a significant portion of its historic assets in those
          businesses.

     18.  Following the Merger, Sub will continue the historic business of
          Target and will use a significant portion of Target's historic
          business assets in a business.


<PAGE>

Page 5


                                       OPINION

Assuming that the Merger is consummated in accordance with the terms and
conditions set forth in the Merger Agreement and based on the facts set forth in
the Proxy Statement/Prospectus, the Letters, and this letter (including all
assumptions and representations), it is our opinion that for federal income tax
purposes:

     1.   The Merger will constitute a "reorganization" within the meaning of
          section 368(a).

     2.   To the extent Target Common Stock is exchanged in the Merger for
          Parent Common Stock, no gain or loss will be recognized by the
          shareholders of Target.  Gain or loss, if any, will be recognized by
          Target shareholders upon the receipt of cash upon the exercise of 
          dissenters' rights and upon the receipt of cash in lieu of fractional
          shares of Parent Common Stock.

Our opinion is limited to the foregoing federal income tax consequences of the
Merger, which are the only matters as to which you have requested our opinion,
and you must judge whether the matters addressed herein are sufficient for your
purposes.  We do not address any other federal income tax consequences of the
Merger or other matters of federal law and have not considered matters
(including state or local tax consequences) arising under the laws of any
jurisdiction other than matters of federal law arising under the laws of the
United States.

Our opinion is based on the understanding that the relevant facts are, and will
be on the Effective Date, as set forth in this letter.  If this understanding is
incorrect or incomplete in any respect, our opinion could be affected.  Our
opinion is also based on the Code, Treasury Regulations, case law, and Internal
Revenue Service rulings as they now exist.  These authorities are all subject to
change and such change may be made with retroactive effect.  We can give no
assurance that after any such change, our opinion would not be different.

We undertake no responsibility to update or supplement our opinion.  Only
Sub and Target may rely on this opinion, and only with respect to the
proposed Merger described herein.


Very truly yours,

/s/ Vavrinek, Trine, Day & Co., LLP

Vavrinek, Trine, Day & Co., LLP
Rancho Cucamonga, California

<PAGE>
                                                                  EXHIBIT 9.1

                                SHAREHOLDER AGREEMENT


          Shareholder Agreement (the "Agreement"), dated as of April 16, 1998,
by and among (i) Adriana M. Boeka, a shareholder (the "Shareholder") of Bank of
Los Angeles, a California banking corporation (the "Company"), (ii) Western
Bancorp, a California corporation ("Western") and (iii) Santa Monica Bank, a
California banking corporation ("Santa Monica").  All terms used herein and not
defined herein shall have the meanings assigned thereto in the Merger Agreement
(defined below).

          Whereas, Western, Santa Monica and the Company have entered into an
Agreement and Plan of Merger, dated the date hereof (the "Merger Agreement"),
providing for the business combination transaction contemplated therein in which
the Company will merge with and into Santa Monica pursuant to the terms and
conditions of the Merger Agreement (the "Merger") and Western will pay
consideration to the Company's shareholders in the form of Western Common Stock;

          Whereas, the Shareholder owns the shares of Company Common Stock
identified on ANNEX I hereto (such shares, together with all shares of Company
Common Stock subsequently acquired by the Shareholder during the term of this
Agreement, being referred to as the "Shares"); and

          Whereas, in order to induce Western and Santa Monica to enter into the
Merger Agreement and in consideration of the substantial expenses incurred and
to be incurred by Western and Santa Monica in connection therewith, the
Shareholder, solely in such Shareholder's capacity as a shareholder of the
Company, has agreed to enter into and perform this Agreement.

          Now, therefore, for good and valuable consideration, the receipt,
sufficiency and adequacy of which are hereby acknowledged, the parties hereto
agree as follows:

          1. AGREEMENT TO VOTE SHARES.  Shareholder shall vote or cause to be
voted, or execute a written consent with respect to, the Shares (a) in favor of
adoption and approval of the Merger Agreement and the Merger and all
transactions relating thereto at every meeting of the shareholders of the
Company at which such matters are considered and at every adjournment thereof
and in connection with every proposal to take action by written consent with
respect thereto, and (b) against any other Acquisition Proposal at every meeting
of the shareholders of the Company at which such matters are considered and at
every adjournment thereof and in connection with every proposal to take action
by written consent with respect thereto.

<PAGE>

          2. NO VOTING TRUSTS.  Shareholder agrees that Shareholder will not,
nor will Shareholder permit any entity under Shareholder's control to, deposit
any Shares in a voting trust or subject the Shares to any agreement, arrangement
or understanding with respect to the voting of the Shares inconsistent with this
Agreement.

          3. LIMITATION ON SALES.  Except to a donee who agrees in writing to be
bound by the provisions of Section 1 hereof, during the term of this Agreement,
Shareholder agrees not to sell, assign, transfer or dispose of any of the
Shares.

          4. REPRESENTATIONS AND WARRANTIES OF SHAREHOLDER.  Shareholder
represents and warrants to and agrees with Western and Santa Monica as follows:

          a. CAPACITY.  Shareholder has all requisite capacity and authority to
     enter into and perform his or her obligations under this Agreement.

          b. BINDING AGREEMENT.  This Agreement constitutes the valid and
     legally binding obligation of Shareholder, subject to bankruptcy,
     insolvency, fraudulent transfer, reorganization, moratorium and similar
     laws of general applicability relating to or affecting creditors' rights
     and to general equity principles.

          c. NON-CONTRAVENTION.  The execution and delivery of this Agreement by
     Shareholder does not, and the performance by Shareholder of his or her
     obligations hereunder and the consummation by Shareholder of the
     transactions contemplated hereby will not, violate or conflict with, or
     constitute a default under, any agreement, instrument, contract or other
     obligation or any order, arbitration award, judgment or decree to which
     Shareholder is a party or by which Shareholder is bound, or any statute,
     rule or regulation to which Shareholder is subject or, in the event that
     Shareholder is a corporation, partnership, trust or other entity, any
     charter, bylaw or other organizational document of the Shareholder.

          d. OWNERSHIP OF SHARES.  Shareholder has good title to all of the
     Shares as of the date hereof, and, except as set forth on Annex A hereto,
     the Shares are so owned free and clear of any liens, security interests,
     charges or other encumbrances.

          5. DISCLOSURE; SOLICITATION.  Neither Shareholder nor any corporation,
partnership, trust or other entity controlled by Shareholder shall:

          a. at any time following the Effective Date, disclose confidential
     information regarding the Company to any third parties, except as required
     by law, regulation, a court order, in the defense of litigation for which
     the Company may be liable, or in any actions relating to this Agreement or
     the Merger Agreement and the transactions contemplated hereby or thereby;
     and


                                         -2-

<PAGE>

          b. for a period of two years following the Effective Date, solicit,
     directly or indirectly, on its own behalf or on behalf of any other person
     or entity, management personnel employed by Western or Santa Monica
     immediately after the Effective Time for employment with any other
     business;

PROVIDED, HOWEVER, that with respect to any of the matters covered in this
Section 5, to the extent that any restriction set forth in this Section 5 is
adjudicated to be invalid or unenforceable in any jurisdiction, the court making
such determination shall have the power to limit, construe or reduce the
duration, scope, activity or area of such provision to the extent necessary to
render such provision enforceable to the maximum extent permitted by applicable
law, such limited form to apply only with respect to the operation of such
provision in the particular jurisdiction in which such adjudication is made.

          6. SPECIFIC PERFORMANCE AND REMEDIES.  Shareholder acknowledges that
it will be impossible to measure in money the damage to Western or to Santa
Monica if Shareholder fails to comply with the obligations imposed by this
Agreement and that, in the event of any such failure, Western and Santa Monica
will not have an adequate remedy at law or in damages.  Accordingly, Shareholder
agrees that injunctive relief or other equitable remedy, in addition to remedies
at law or in damages, is the appropriate remedy for any such failure and will
not oppose the granting of such relief on the basis that Western or Santa Monica
have an adequate remedy at law.  Shareholder agrees that it will not seek, and
agrees to waive any requirement for, the securing or posting of a bond in
connection with Western or Santa Monica's seeking or obtaining such equitable
relief.  In addition to all other rights or remedies which Western or Santa
Monica may have against Shareholder in the event of a default in Shareholder's
performance of Shareholder's obligations under this Agreement, Shareholder shall
be liable to Western and Santa Monica for all litigation costs and attorneys'
fees incurred by Western and Santa Monica in connection with the enforcement of
any of its rights or remedies against Shareholder.  In addition, after
discussing the matter with Shareholder, Western and Santa Monica shall have the
right to inform any third party that Western and Santa Monica reasonably
believes to be, or to be contemplating, participating with Shareholder or
receiving from Shareholder assistance in violation of this Agreement, of the
terms of this Agreement and of the rights of Western and Santa Monica hereunder,
and that participation by any such persons with Shareholder in activities in
violation of Shareholder's agreement with Western and Santa Monica set forth in
this Agreement may give rise to claims by Western and Santa Monica against such
third party.

          7. TERM OF AGREEMENT; TERMINATION.  a.  The term of this Agreement
shall commence on the date hereof.

          b. This Agreement shall terminate upon the date, if any, of the
termination of the Merger Agreement prior to the Effective Time in accordance
with its terms.  Upon such termination, no party shall have any further
obligations or liabilities hereunder; PROVIDED, HOWEVER, such termination shall
not relieve any party from liability for any breach


                                         -3-

<PAGE>

of this Agreement PRIOR to such termination.  If this Agreement is terminated
pursuant to Section 8.01 of the Merger Agreement, so long as the Company honors
its applicable obligations under Section 8.03 of the Merger Agreement, no party
shall have any further obligations or liabilities under this Agreement.

          c.  If the Merger Agreement is not terminated prior to the Effective
Time, this Agreement (except for the provisions of Sections 4, 5(b), 6, 9 and
10, which shall survive the Effective Time), shall terminate upon the Effective
Time.  Sections 4, 5, 6, 9 and 10 shall terminate on the date two years after
the Effective Time.

          8. ENTIRE AGREEMENT.  This Agreement supersedes all prior agreements,
written or oral, among the parties hereto with respect to the subject matter
hereof and contains the entire agreement among the parties with respect to the
subject matter hereof.  This Agreement may not be amended, supplemented or
modified, and no provisions hereof may be modified or waived, except by an
instrument in writing signed by each party hereto.  No waiver of any provisions
hereof by either party shall be deemed a waiver of any other provisions hereof
by any such party, nor shall any such waiver be deemed a continuing waiver of
any provision hereof by such party.

          9. NOTICES.  All notices, requests, claims, demands or other
communications hereunder shall be in writing and shall be deemed given when
delivered personally, upon receipt of a transmission confirmation if sent by
telecopy or like transmission and on the next business day when sent by a
reputable overnight courier service to the parties at the following addresses
(or at such other address for a party as shall be specified by like notice):

          If to Western or Santa Monica:

          Western Bancorp
          1251 Westwood Blvd.
          Los Angeles, California  90024
          Telecopier:  (310) 477-8611
          Attention:  Matthew P. Wagner

          With a copy to:

          Sullivan & Cromwell
          444 South Flower Street
          Los Angeles, California  90071
          Telecopier:  (213) 683-0458
          Attention:  Stanley F. Farrar, Esq.


                                         -4-

<PAGE>

     If to the Shareholder:





          10. MISCELLANEOUS.

          a. SEVERABILITY.  If any provision of this Agreement or the
     application of such provision to any person or circumstances shall be held
     invalid or unenforceable by a court of competent jurisdiction, such
     provision or application shall be unenforceable only to the extent of such
     invalidity or unenforceability, and the remainder of the provision held
     invalid or unenforceable and the application of such provision to persons
     or circumstances, other than the party as to which it is held invalid, and
     the remainder of this Agreement, shall not be affected.

          b. CAPACITY.  The covenants contained herein shall apply to
     Shareholder solely in his or her capacity as a shareholder of the Company,
     and no covenant contained herein shall apply to Shareholder in his or her
     capacity as a director or officer of the Company.

          c. COUNTERPARTS.  This Agreement may be executed in one or more
     counterparts, each of which shall be deemed to be an original but all of
     which together shall constitute one and the same instrument.

          d. HEADINGS.  All Section headings herein are for convenience of
     reference only and are not part of this Agreement, and no construction or
     reference shall be derived therefrom.

          e. CHOICE OF LAW.  THIS AGREEMENT SHALL BE DEEMED A CONTRACT MADE
     UNDER, AND FOR ALL PURPOSES SHALL BE CONSTRUED IN ACCORDANCE WITH, THE LAWS
     OF THE STATE OF CALIFORNIA, WITHOUT REFERENCE TO ITS CONFLICTS OF LAW
     PRINCIPLES.

          11. ATTORNEY'S FEES.  The prevailing party or parties in any
litigation, arbitration, mediation, bankruptcy, insolvency or other proceeding
("Proceeding") relating to the enforcement or interpretation of this Agreement
may recover from the unsuccessful party or parties all fees and disbursements of
counsel (including expert witness and other consultants' fees and costs)
relating to or arising out of (a) the Proceeding (whether or not the Proceeding
proceeds to judgment), and (b) any post-judgment or post-award proceeding
including, without limitation, one to enforce or collect any judgment or award
resulting from


                                         -5-

<PAGE>

the Proceeding.  All such judgments and awards shall contain a specific
provision for the recovery of all such subsequently incurred costs, expenses,
and fees and disbursements of counsel.


                                         -6-

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have executed and delivered
this Agreement as of the date first written above.


                                        WESTERN BANCORP
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    

                                        SANTA MONICA
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    

                                          Adriana M. Boeka
                                         --------------------------------
                                         (Print or type name)


                                          /s/ Adriana M. Boeka
                                         --------------------------------
                                         (Signature)


                                         -7-



<PAGE>
                                                            EXHIBIT 9.2

                                SHAREHOLDER AGREEMENT


          Shareholder Agreement (the "Agreement"), dated as of April 16, 
1998, by and among (i) Maurice J. Burford, a shareholder (the "Shareholder") 
of Bank of Los Angeles, a California banking corporation (the "Company"), 
(ii) Western Bancorp, a California corporation ("Western") and (iii) Santa 
Monica Bank, a California banking corporation ("Santa Monica").  All terms 
used herein and not defined herein shall have the meanings assigned thereto 
in the Merger Agreement (defined below).

          Whereas, Western, Santa Monica and the Company have entered into an
Agreement and Plan of Merger, dated the date hereof (the "Merger Agreement"),
providing for the business combination transaction contemplated therein in which
the Company will merge with and into Santa Monica pursuant to the terms and
conditions of the Merger Agreement (the "Merger") and Western will pay
consideration to the Company's shareholders in the form of Western Common Stock;

          Whereas, the Shareholder owns the shares of Company Common Stock
identified on ANNEX I hereto (such shares, together with all shares of Company
Common Stock subsequently acquired by the Shareholder during the term of this
Agreement, being referred to as the "Shares"); and

          Whereas, in order to induce Western and Santa Monica to enter into the
Merger Agreement and in consideration of the substantial expenses incurred and
to be incurred by Western and Santa Monica in connection therewith, the
Shareholder, solely in such Shareholder's capacity as a shareholder of the
Company, has agreed to enter into and perform this Agreement.

          Now, therefore, for good and valuable consideration, the receipt,
sufficiency and adequacy of which are hereby acknowledged, the parties hereto
agree as follows:

          1. AGREEMENT TO VOTE SHARES.  Shareholder shall vote or cause to be
voted, or execute a written consent with respect to, the Shares (a) in favor of
adoption and approval of the Merger Agreement and the Merger and all
transactions relating thereto at every meeting of the shareholders of the
Company at which such matters are considered and at every adjournment thereof
and in connection with every proposal to take action by written consent with
respect thereto, and (b) against any other Acquisition Proposal at every meeting
of the shareholders of the Company at which such matters are considered and at
every adjournment thereof and in connection with every proposal to take action
by written consent with respect thereto.

<PAGE>

          2. NO VOTING TRUSTS.  Shareholder agrees that Shareholder will not,
nor will Shareholder permit any entity under Shareholder's control to, deposit
any Shares in a voting trust or subject the Shares to any agreement, arrangement
or understanding with respect to the voting of the Shares inconsistent with this
Agreement.

          3. LIMITATION ON SALES.  Except to a donee who agrees in writing to be
bound by the provisions of Section 1 hereof, during the term of this Agreement,
Shareholder agrees not to sell, assign, transfer or dispose of any of the
Shares.

          4. REPRESENTATIONS AND WARRANTIES OF SHAREHOLDER.  Shareholder
represents and warrants to and agrees with Western and Santa Monica as follows:

          a. CAPACITY.  Shareholder has all requisite capacity and authority to
     enter into and perform his or her obligations under this Agreement.

          b. BINDING AGREEMENT.  This Agreement constitutes the valid and
     legally binding obligation of Shareholder, subject to bankruptcy,
     insolvency, fraudulent transfer, reorganization, moratorium and similar
     laws of general applicability relating to or affecting creditors' rights
     and to general equity principles.

          c. NON-CONTRAVENTION.  The execution and delivery of this Agreement by
     Shareholder does not, and the performance by Shareholder of his or her
     obligations hereunder and the consummation by Shareholder of the
     transactions contemplated hereby will not, violate or conflict with, or
     constitute a default under, any agreement, instrument, contract or other
     obligation or any order, arbitration award, judgment or decree to which
     Shareholder is a party or by which Shareholder is bound, or any statute,
     rule or regulation to which Shareholder is subject or, in the event that
     Shareholder is a corporation, partnership, trust or other entity, any
     charter, bylaw or other organizational document of the Shareholder.

          d. OWNERSHIP OF SHARES.  Shareholder has good title to all of the
     Shares as of the date hereof, and, except as set forth on Annex A hereto,
     the Shares are so owned free and clear of any liens, security interests,
     charges or other encumbrances.

          5. DISCLOSURE; SOLICITATION.  Neither Shareholder nor any corporation,
partnership, trust or other entity controlled by Shareholder shall:

          a. at any time following the Effective Date, disclose confidential
     information regarding the Company to any third parties, except as required
     by law, regulation, a court order, in the defense of litigation for which
     the Company may be liable, or in any actions relating to this Agreement or
     the Merger Agreement and the transactions contemplated hereby or thereby;
     and


                                         -2-

<PAGE>

          b. for a period of two years following the Effective Date, solicit,
     directly or indirectly, on its own behalf or on behalf of any other person
     or entity, management personnel employed by Western or Santa Monica
     immediately after the Effective Time for employment with any other
     business;

PROVIDED, HOWEVER, that with respect to any of the matters covered in this
Section 5, to the extent that any restriction set forth in this Section 5 is
adjudicated to be invalid or unenforceable in any jurisdiction, the court making
such determination shall have the power to limit, construe or reduce the
duration, scope, activity or area of such provision to the extent necessary to
render such provision enforceable to the maximum extent permitted by applicable
law, such limited form to apply only with respect to the operation of such
provision in the particular jurisdiction in which such adjudication is made.

          6. SPECIFIC PERFORMANCE AND REMEDIES.  Shareholder acknowledges that
it will be impossible to measure in money the damage to Western or to Santa
Monica if Shareholder fails to comply with the obligations imposed by this
Agreement and that, in the event of any such failure, Western and Santa Monica
will not have an adequate remedy at law or in damages.  Accordingly, Shareholder
agrees that injunctive relief or other equitable remedy, in addition to remedies
at law or in damages, is the appropriate remedy for any such failure and will
not oppose the granting of such relief on the basis that Western or Santa Monica
have an adequate remedy at law.  Shareholder agrees that it will not seek, and
agrees to waive any requirement for, the securing or posting of a bond in
connection with Western or Santa Monica's seeking or obtaining such equitable
relief.  In addition to all other rights or remedies which Western or Santa
Monica may have against Shareholder in the event of a default in Shareholder's
performance of Shareholder's obligations under this Agreement, Shareholder shall
be liable to Western and Santa Monica for all litigation costs and attorneys'
fees incurred by Western and Santa Monica in connection with the enforcement of
any of its rights or remedies against Shareholder.  In addition, after
discussing the matter with Shareholder, Western and Santa Monica shall have the
right to inform any third party that Western and Santa Monica reasonably
believes to be, or to be contemplating, participating with Shareholder or
receiving from Shareholder assistance in violation of this Agreement, of the
terms of this Agreement and of the rights of Western and Santa Monica hereunder,
and that participation by any such persons with Shareholder in activities in
violation of Shareholder's agreement with Western and Santa Monica set forth in
this Agreement may give rise to claims by Western and Santa Monica against such
third party.

          7. TERM OF AGREEMENT; TERMINATION.  a.  The term of this Agreement
shall commence on the date hereof.

          b. This Agreement shall terminate upon the date, if any, of the
termination of the Merger Agreement prior to the Effective Time in accordance
with its terms.  Upon such termination, no party shall have any further
obligations or liabilities hereunder; PROVIDED, HOWEVER, such termination shall
not relieve any party from liability for any breach


                                         -3-

<PAGE>

of this Agreement PRIOR to such termination.  If this Agreement is terminated
pursuant to Section 8.01 of the Merger Agreement, so long as the Company honors
its applicable obligations under Section 8.03 of the Merger Agreement, no party
shall have any further obligations or liabilities under this Agreement.

          c.  If the Merger Agreement is not terminated prior to the Effective
Time, this Agreement (except for the provisions of Sections 4, 5(b), 6, 9 and
10, which shall survive the Effective Time), shall terminate upon the Effective
Time.  Sections 4, 5, 6, 9 and 10 shall terminate on the date two years after
the Effective Time.

          8. ENTIRE AGREEMENT.  This Agreement supersedes all prior agreements,
written or oral, among the parties hereto with respect to the subject matter
hereof and contains the entire agreement among the parties with respect to the
subject matter hereof.  This Agreement may not be amended, supplemented or
modified, and no provisions hereof may be modified or waived, except by an
instrument in writing signed by each party hereto.  No waiver of any provisions
hereof by either party shall be deemed a waiver of any other provisions hereof
by any such party, nor shall any such waiver be deemed a continuing waiver of
any provision hereof by such party.

          9. NOTICES.  All notices, requests, claims, demands or other
communications hereunder shall be in writing and shall be deemed given when
delivered personally, upon receipt of a transmission confirmation if sent by
telecopy or like transmission and on the next business day when sent by a
reputable overnight courier service to the parties at the following addresses
(or at such other address for a party as shall be specified by like notice):

          If to Western or Santa Monica:

          Western Bancorp
          1251 Westwood Blvd.
          Los Angeles, California  90024
          Telecopier:  (310) 477-8611
          Attention:  Matthew P. Wagner

          With a copy to:

          Sullivan & Cromwell
          444 South Flower Street
          Los Angeles, California  90071
          Telecopier:  (213) 683-0458
          Attention:  Stanley F. Farrar, Esq.


                                         -4-

<PAGE>

     If to the Shareholder:





          10. MISCELLANEOUS.

          a. SEVERABILITY.  If any provision of this Agreement or the
     application of such provision to any person or circumstances shall be held
     invalid or unenforceable by a court of competent jurisdiction, such
     provision or application shall be unenforceable only to the extent of such
     invalidity or unenforceability, and the remainder of the provision held
     invalid or unenforceable and the application of such provision to persons
     or circumstances, other than the party as to which it is held invalid, and
     the remainder of this Agreement, shall not be affected.

          b. CAPACITY.  The covenants contained herein shall apply to
     Shareholder solely in his or her capacity as a shareholder of the Company,
     and no covenant contained herein shall apply to Shareholder in his or her
     capacity as a director or officer of the Company.

          c. COUNTERPARTS.  This Agreement may be executed in one or more
     counterparts, each of which shall be deemed to be an original but all of
     which together shall constitute one and the same instrument.

          d. HEADINGS.  All Section headings herein are for convenience of
     reference only and are not part of this Agreement, and no construction or
     reference shall be derived therefrom.

          e. CHOICE OF LAW.  THIS AGREEMENT SHALL BE DEEMED A CONTRACT MADE
     UNDER, AND FOR ALL PURPOSES SHALL BE CONSTRUED IN ACCORDANCE WITH, THE LAWS
     OF THE STATE OF CALIFORNIA, WITHOUT REFERENCE TO ITS CONFLICTS OF LAW
     PRINCIPLES.

          11. ATTORNEY'S FEES.  The prevailing party or parties in any
litigation, arbitration, mediation, bankruptcy, insolvency or other proceeding
("Proceeding") relating to the enforcement or interpretation of this Agreement
may recover from the unsuccessful party or parties all fees and disbursements of
counsel (including expert witness and other consultants' fees and costs)
relating to or arising out of (a) the Proceeding (whether or not the Proceeding
proceeds to judgment), and (b) any post-judgment or post-award proceeding
including, without limitation, one to enforce or collect any judgment or award
resulting from


                                         -5-

<PAGE>

the Proceeding.  All such judgments and awards shall contain a specific
provision for the recovery of all such subsequently incurred costs, expenses,
and fees and disbursements of counsel.


                                         -6-

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have executed and delivered
this Agreement as of the date first written above.


                                        WESTERN BANCORP
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    

                                        SANTA MONICA
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    

                                          Maurice J. Burford
                                         --------------------------------
                                         (Print or type name)


                                          /s/ Maurice J. Burford
                                         --------------------------------
                                         (Signature)


                                         -7-



<PAGE>
                                                                  EXHIBIT 9.3

                                SHAREHOLDER AGREEMENT


          Shareholder Agreement (the "Agreement"), dated as of April 16, 
1998, by and among (i) Mary Anne Chalker, a shareholder (the "Shareholder") 
of Bank of Los Angeles, a California banking corporation (the "Company"), 
(ii) Western Bancorp, a California corporation ("Western") and (iii) Santa 
Monica Bank, a California banking corporation ("Santa Monica").  All terms 
used herein and not defined herein shall have the meanings assigned thereto 
in the Merger Agreement (defined below).

          Whereas, Western, Santa Monica and the Company have entered into an
Agreement and Plan of Merger, dated the date hereof (the "Merger Agreement"),
providing for the business combination transaction contemplated therein in which
the Company will merge with and into Santa Monica pursuant to the terms and
conditions of the Merger Agreement (the "Merger") and Western will pay
consideration to the Company's shareholders in the form of Western Common Stock;

          Whereas, the Shareholder owns the shares of Company Common Stock
identified on ANNEX I hereto (such shares, together with all shares of Company
Common Stock subsequently acquired by the Shareholder during the term of this
Agreement, being referred to as the "Shares"); and

          Whereas, in order to induce Western and Santa Monica to enter into the
Merger Agreement and in consideration of the substantial expenses incurred and
to be incurred by Western and Santa Monica in connection therewith, the
Shareholder, solely in such Shareholder's capacity as a shareholder of the
Company, has agreed to enter into and perform this Agreement.

          Now, therefore, for good and valuable consideration, the receipt,
sufficiency and adequacy of which are hereby acknowledged, the parties hereto
agree as follows:

          1. AGREEMENT TO VOTE SHARES.  Shareholder shall vote or cause to be
voted, or execute a written consent with respect to, the Shares (a) in favor of
adoption and approval of the Merger Agreement and the Merger and all
transactions relating thereto at every meeting of the shareholders of the
Company at which such matters are considered and at every adjournment thereof
and in connection with every proposal to take action by written consent with
respect thereto, and (b) against any other Acquisition Proposal at every meeting
of the shareholders of the Company at which such matters are considered and at
every adjournment thereof and in connection with every proposal to take action
by written consent with respect thereto.

<PAGE>

          2. NO VOTING TRUSTS.  Shareholder agrees that Shareholder will not,
nor will Shareholder permit any entity under Shareholder's control to, deposit
any Shares in a voting trust or subject the Shares to any agreement, arrangement
or understanding with respect to the voting of the Shares inconsistent with this
Agreement.

          3. LIMITATION ON SALES.  Except to a donee who agrees in writing to be
bound by the provisions of Section 1 hereof, during the term of this Agreement,
Shareholder agrees not to sell, assign, transfer or dispose of any of the
Shares.

          4. REPRESENTATIONS AND WARRANTIES OF SHAREHOLDER.  Shareholder
represents and warrants to and agrees with Western and Santa Monica as follows:

          a. CAPACITY.  Shareholder has all requisite capacity and authority to
     enter into and perform his or her obligations under this Agreement.

          b. BINDING AGREEMENT.  This Agreement constitutes the valid and
     legally binding obligation of Shareholder, subject to bankruptcy,
     insolvency, fraudulent transfer, reorganization, moratorium and similar
     laws of general applicability relating to or affecting creditors' rights
     and to general equity principles.

          c. NON-CONTRAVENTION.  The execution and delivery of this Agreement by
     Shareholder does not, and the performance by Shareholder of his or her
     obligations hereunder and the consummation by Shareholder of the
     transactions contemplated hereby will not, violate or conflict with, or
     constitute a default under, any agreement, instrument, contract or other
     obligation or any order, arbitration award, judgment or decree to which
     Shareholder is a party or by which Shareholder is bound, or any statute,
     rule or regulation to which Shareholder is subject or, in the event that
     Shareholder is a corporation, partnership, trust or other entity, any
     charter, bylaw or other organizational document of the Shareholder.

          d. OWNERSHIP OF SHARES.  Shareholder has good title to all of the
     Shares as of the date hereof, and, except as set forth on Annex A hereto,
     the Shares are so owned free and clear of any liens, security interests,
     charges or other encumbrances.

          5. DISCLOSURE; SOLICITATION.  Neither Shareholder nor any corporation,
partnership, trust or other entity controlled by Shareholder shall:

          a. at any time following the Effective Date, disclose confidential
     information regarding the Company to any third parties, except as required
     by law, regulation, a court order, in the defense of litigation for which
     the Company may be liable, or in any actions relating to this Agreement or
     the Merger Agreement and the transactions contemplated hereby or thereby;
     and


                                         -2-

<PAGE>

          b. for a period of two years following the Effective Date, solicit,
     directly or indirectly, on its own behalf or on behalf of any other person
     or entity, management personnel employed by Western or Santa Monica
     immediately after the Effective Time for employment with any other
     business;

PROVIDED, HOWEVER, that with respect to any of the matters covered in this
Section 5, to the extent that any restriction set forth in this Section 5 is
adjudicated to be invalid or unenforceable in any jurisdiction, the court making
such determination shall have the power to limit, construe or reduce the
duration, scope, activity or area of such provision to the extent necessary to
render such provision enforceable to the maximum extent permitted by applicable
law, such limited form to apply only with respect to the operation of such
provision in the particular jurisdiction in which such adjudication is made.

          6. SPECIFIC PERFORMANCE AND REMEDIES.  Shareholder acknowledges that
it will be impossible to measure in money the damage to Western or to Santa
Monica if Shareholder fails to comply with the obligations imposed by this
Agreement and that, in the event of any such failure, Western and Santa Monica
will not have an adequate remedy at law or in damages.  Accordingly, Shareholder
agrees that injunctive relief or other equitable remedy, in addition to remedies
at law or in damages, is the appropriate remedy for any such failure and will
not oppose the granting of such relief on the basis that Western or Santa Monica
have an adequate remedy at law.  Shareholder agrees that it will not seek, and
agrees to waive any requirement for, the securing or posting of a bond in
connection with Western or Santa Monica's seeking or obtaining such equitable
relief.  In addition to all other rights or remedies which Western or Santa
Monica may have against Shareholder in the event of a default in Shareholder's
performance of Shareholder's obligations under this Agreement, Shareholder shall
be liable to Western and Santa Monica for all litigation costs and attorneys'
fees incurred by Western and Santa Monica in connection with the enforcement of
any of its rights or remedies against Shareholder.  In addition, after
discussing the matter with Shareholder, Western and Santa Monica shall have the
right to inform any third party that Western and Santa Monica reasonably
believes to be, or to be contemplating, participating with Shareholder or
receiving from Shareholder assistance in violation of this Agreement, of the
terms of this Agreement and of the rights of Western and Santa Monica hereunder,
and that participation by any such persons with Shareholder in activities in
violation of Shareholder's agreement with Western and Santa Monica set forth in
this Agreement may give rise to claims by Western and Santa Monica against such
third party.

          7. TERM OF AGREEMENT; TERMINATION.  a.  The term of this Agreement
shall commence on the date hereof.

          b. This Agreement shall terminate upon the date, if any, of the
termination of the Merger Agreement prior to the Effective Time in accordance
with its terms.  Upon such termination, no party shall have any further
obligations or liabilities hereunder; PROVIDED, HOWEVER, such termination shall
not relieve any party from liability for any breach


                                         -3-

<PAGE>

of this Agreement PRIOR to such termination.  If this Agreement is terminated
pursuant to Section 8.01 of the Merger Agreement, so long as the Company honors
its applicable obligations under Section 8.03 of the Merger Agreement, no party
shall have any further obligations or liabilities under this Agreement.

          c.  If the Merger Agreement is not terminated prior to the Effective
Time, this Agreement (except for the provisions of Sections 4, 5(b), 6, 9 and
10, which shall survive the Effective Time), shall terminate upon the Effective
Time.  Sections 4, 5, 6, 9 and 10 shall terminate on the date two years after
the Effective Time.

          8. ENTIRE AGREEMENT.  This Agreement supersedes all prior agreements,
written or oral, among the parties hereto with respect to the subject matter
hereof and contains the entire agreement among the parties with respect to the
subject matter hereof.  This Agreement may not be amended, supplemented or
modified, and no provisions hereof may be modified or waived, except by an
instrument in writing signed by each party hereto.  No waiver of any provisions
hereof by either party shall be deemed a waiver of any other provisions hereof
by any such party, nor shall any such waiver be deemed a continuing waiver of
any provision hereof by such party.

          9. NOTICES.  All notices, requests, claims, demands or other
communications hereunder shall be in writing and shall be deemed given when
delivered personally, upon receipt of a transmission confirmation if sent by
telecopy or like transmission and on the next business day when sent by a
reputable overnight courier service to the parties at the following addresses
(or at such other address for a party as shall be specified by like notice):

          If to Western or Santa Monica:

          Western Bancorp
          1251 Westwood Blvd.
          Los Angeles, California  90024
          Telecopier:  (310) 477-8611
          Attention:  Matthew P. Wagner

          With a copy to:

          Sullivan & Cromwell
          444 South Flower Street
          Los Angeles, California  90071
          Telecopier:  (213) 683-0458
          Attention:  Stanley F. Farrar, Esq.


                                         -4-

<PAGE>

     If to the Shareholder:





          10. MISCELLANEOUS.

          a. SEVERABILITY.  If any provision of this Agreement or the
     application of such provision to any person or circumstances shall be held
     invalid or unenforceable by a court of competent jurisdiction, such
     provision or application shall be unenforceable only to the extent of such
     invalidity or unenforceability, and the remainder of the provision held
     invalid or unenforceable and the application of such provision to persons
     or circumstances, other than the party as to which it is held invalid, and
     the remainder of this Agreement, shall not be affected.

          b. CAPACITY.  The covenants contained herein shall apply to
     Shareholder solely in his or her capacity as a shareholder of the Company,
     and no covenant contained herein shall apply to Shareholder in his or her
     capacity as a director or officer of the Company.

          c. COUNTERPARTS.  This Agreement may be executed in one or more
     counterparts, each of which shall be deemed to be an original but all of
     which together shall constitute one and the same instrument.

          d. HEADINGS.  All Section headings herein are for convenience of
     reference only and are not part of this Agreement, and no construction or
     reference shall be derived therefrom.

          e. CHOICE OF LAW.  THIS AGREEMENT SHALL BE DEEMED A CONTRACT MADE
     UNDER, AND FOR ALL PURPOSES SHALL BE CONSTRUED IN ACCORDANCE WITH, THE LAWS
     OF THE STATE OF CALIFORNIA, WITHOUT REFERENCE TO ITS CONFLICTS OF LAW
     PRINCIPLES.

          11. ATTORNEY'S FEES.  The prevailing party or parties in any
litigation, arbitration, mediation, bankruptcy, insolvency or other proceeding
("Proceeding") relating to the enforcement or interpretation of this Agreement
may recover from the unsuccessful party or parties all fees and disbursements of
counsel (including expert witness and other consultants' fees and costs)
relating to or arising out of (a) the Proceeding (whether or not the Proceeding
proceeds to judgment), and (b) any post-judgment or post-award proceeding
including, without limitation, one to enforce or collect any judgment or award
resulting from


                                         -5-

<PAGE>

the Proceeding.  All such judgments and awards shall contain a specific
provision for the recovery of all such subsequently incurred costs, expenses,
and fees and disbursements of counsel.


                                         -6-

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have executed and delivered
this Agreement as of the date first written above.


                                        WESTERN BANCORP
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    

                                        SANTA MONICA
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    

                                          Mary Anne Chalker
                                         --------------------------------
                                         (Print or type name)


                                          /s/ Mary Anne Chalker
                                         --------------------------------
                                         (Signature)


                                         -7-



<PAGE>

   
                                                                   EXHIBIT 9.4
    

                                SHAREHOLDER AGREEMENT


          Shareholder Agreement (the "Agreement"), dated as of April 16, 1998,
by and among (i) Roy Doumani, a shareholder (the "Shareholder") of Bank of
Los Angeles, a California banking corporation (the "Company"), (ii) Western
Bancorp, a California corporation ("Western") and (iii) Santa Monica Bank, a
California banking corporation ("Santa Monica").  All terms used herein and not
defined herein shall have the meanings assigned thereto in the Merger Agreement
(defined below).

          Whereas, Western, Santa Monica and the Company have entered into an
Agreement and Plan of Merger, dated the date hereof (the "Merger Agreement"),
providing for the business combination transaction contemplated therein in which
the Company will merge with and into Santa Monica pursuant to the terms and
conditions of the Merger Agreement (the "Merger") and Western will pay
consideration to the Company's shareholders in the form of Western Common Stock;

          Whereas, the Shareholder owns the shares of Company Common Stock
identified on ANNEX I hereto (such shares, together with all shares of Company
Common Stock subsequently acquired by the Shareholder during the term of this
Agreement, being referred to as the "Shares"); and

          Whereas, in order to induce Western and Santa Monica to enter into the
Merger Agreement and in consideration of the substantial expenses incurred and
to be incurred by Western and Santa Monica in connection therewith, the
Shareholder, solely in such Shareholder's capacity as a shareholder of the
Company, has agreed to enter into and perform this Agreement.

          Now, therefore, for good and valuable consideration, the receipt,
sufficiency and adequacy of which are hereby acknowledged, the parties hereto
agree as follows:

          1. AGREEMENT TO VOTE SHARES.  Shareholder shall vote or cause to be
voted, or execute a written consent with respect to, the Shares (a) in favor of
adoption and approval of the Merger Agreement and the Merger and all
transactions relating thereto at every meeting of the shareholders of the
Company at which such matters are considered and at every adjournment thereof
and in connection with every proposal to take action by written consent with
respect thereto, and (b) against any other Acquisition Proposal at every meeting
of the shareholders of the Company at which such matters are considered and at
every adjournment thereof and in connection with every proposal to take action
by written consent with respect thereto.

<PAGE>

          2. NO VOTING TRUSTS.  Shareholder agrees that Shareholder will not,
nor will Shareholder permit any entity under Shareholder's control to, deposit
any Shares in a voting trust or subject the Shares to any agreement, arrangement
or understanding with respect to the voting of the Shares inconsistent with this
Agreement.

          3. LIMITATION ON SALES.  Except to a donee who agrees in writing to be
bound by the provisions of Section 1 hereof, during the term of this Agreement,
Shareholder agrees not to sell, assign, transfer or dispose of any of the
Shares.

          4. REPRESENTATIONS AND WARRANTIES OF SHAREHOLDER.  Shareholder
represents and warrants to and agrees with Western and Santa Monica as follows:

          a. CAPACITY.  Shareholder has all requisite capacity and authority to
     enter into and perform his or her obligations under this Agreement.

          b. BINDING AGREEMENT.  This Agreement constitutes the valid and
     legally binding obligation of Shareholder, subject to bankruptcy,
     insolvency, fraudulent transfer, reorganization, moratorium and similar
     laws of general applicability relating to or affecting creditors' rights
     and to general equity principles.

          c. NON-CONTRAVENTION.  The execution and delivery of this Agreement by
     Shareholder does not, and the performance by Shareholder of his or her
     obligations hereunder and the consummation by Shareholder of the
     transactions contemplated hereby will not, violate or conflict with, or
     constitute a default under, any agreement, instrument, contract or other
     obligation or any order, arbitration award, judgment or decree to which
     Shareholder is a party or by which Shareholder is bound, or any statute,
     rule or regulation to which Shareholder is subject or, in the event that
     Shareholder is a corporation, partnership, trust or other entity, any
     charter, bylaw or other organizational document of the Shareholder.

          d. OWNERSHIP OF SHARES.  Shareholder has good title to all of the
     Shares as of the date hereof, and, except as set forth on Annex A hereto,
     the Shares are so owned free and clear of any liens, security interests,
     charges or other encumbrances.

          5. DISCLOSURE; SOLICITATION.  Neither Shareholder nor any corporation,
partnership, trust or other entity controlled by Shareholder shall:

          a. at any time following the Effective Date, disclose confidential
     information regarding the Company to any third parties, except as required
     by law, regulation, a court order, in the defense of litigation for which
     the Company may be liable, or in any actions relating to this Agreement or
     the Merger Agreement and the transactions contemplated hereby or thereby;
     and


                                         -2-

<PAGE>

          b. for a period of two years following the Effective Date, solicit,
     directly or indirectly, on its own behalf or on behalf of any other person
     or entity, management personnel employed by Western or Santa Monica
     immediately after the Effective Time for employment with any other
     business;

PROVIDED, HOWEVER, that with respect to any of the matters covered in this
Section 5, to the extent that any restriction set forth in this Section 5 is
adjudicated to be invalid or unenforceable in any jurisdiction, the court making
such determination shall have the power to limit, construe or reduce the
duration, scope, activity or area of such provision to the extent necessary to
render such provision enforceable to the maximum extent permitted by applicable
law, such limited form to apply only with respect to the operation of such
provision in the particular jurisdiction in which such adjudication is made.

          6. SPECIFIC PERFORMANCE AND REMEDIES.  Shareholder acknowledges that
it will be impossible to measure in money the damage to Western or to Santa
Monica if Shareholder fails to comply with the obligations imposed by this
Agreement and that, in the event of any such failure, Western and Santa Monica
will not have an adequate remedy at law or in damages.  Accordingly, Shareholder
agrees that injunctive relief or other equitable remedy, in addition to remedies
at law or in damages, is the appropriate remedy for any such failure and will
not oppose the granting of such relief on the basis that Western or Santa Monica
have an adequate remedy at law.  Shareholder agrees that it will not seek, and
agrees to waive any requirement for, the securing or posting of a bond in
connection with Western or Santa Monica's seeking or obtaining such equitable
relief.  In addition to all other rights or remedies which Western or Santa
Monica may have against Shareholder in the event of a default in Shareholder's
performance of Shareholder's obligations under this Agreement, Shareholder shall
be liable to Western and Santa Monica for all litigation costs and attorneys'
fees incurred by Western and Santa Monica in connection with the enforcement of
any of its rights or remedies against Shareholder.  In addition, after
discussing the matter with Shareholder, Western and Santa Monica shall have the
right to inform any third party that Western and Santa Monica reasonably
believes to be, or to be contemplating, participating with Shareholder or
receiving from Shareholder assistance in violation of this Agreement, of the
terms of this Agreement and of the rights of Western and Santa Monica hereunder,
and that participation by any such persons with Shareholder in activities in
violation of Shareholder's agreement with Western and Santa Monica set forth in
this Agreement may give rise to claims by Western and Santa Monica against such
third party.

          7. TERM OF AGREEMENT; TERMINATION.  a.  The term of this Agreement
shall commence on the date hereof.

          b. This Agreement shall terminate upon the date, if any, of the
termination of the Merger Agreement prior to the Effective Time in accordance
with its terms.  Upon such termination, no party shall have any further
obligations or liabilities hereunder; PROVIDED, HOWEVER, such termination shall
not relieve any party from liability for any breach


                                         -3-

<PAGE>

of this Agreement PRIOR to such termination.  If this Agreement is terminated
pursuant to Section 8.01 of the Merger Agreement, so long as the Company honors
its applicable obligations under Section 8.03 of the Merger Agreement, no party
shall have any further obligations or liabilities under this Agreement.

          c.  If the Merger Agreement is not terminated prior to the Effective
Time, this Agreement (except for the provisions of Sections 4, 5(b), 6, 9 and
10, which shall survive the Effective Time), shall terminate upon the Effective
Time.  Sections 4, 5, 6, 9 and 10 shall terminate on the date two years after
the Effective Time.

          8. ENTIRE AGREEMENT.  This Agreement supersedes all prior agreements,
written or oral, among the parties hereto with respect to the subject matter
hereof and contains the entire agreement among the parties with respect to the
subject matter hereof.  This Agreement may not be amended, supplemented or
modified, and no provisions hereof may be modified or waived, except by an
instrument in writing signed by each party hereto.  No waiver of any provisions
hereof by either party shall be deemed a waiver of any other provisions hereof
by any such party, nor shall any such waiver be deemed a continuing waiver of
any provision hereof by such party.

          9. NOTICES.  All notices, requests, claims, demands or other
communications hereunder shall be in writing and shall be deemed given when
delivered personally, upon receipt of a transmission confirmation if sent by
telecopy or like transmission and on the next business day when sent by a
reputable overnight courier service to the parties at the following addresses
(or at such other address for a party as shall be specified by like notice):

          If to Western or Santa Monica:

          Western Bancorp
          1251 Westwood Blvd.
          Los Angeles, California  90024
          Telecopier:  (310) 477-8611
          Attention:  Matthew P. Wagner

          With a copy to:

          Sullivan & Cromwell
          444 South Flower Street
          Los Angeles, California  90071
          Telecopier:  (213) 683-0458
          Attention:  Stanley F. Farrar, Esq.


                                         -4-

<PAGE>

     If to the Shareholder:





          10. MISCELLANEOUS.

          a. SEVERABILITY.  If any provision of this Agreement or the
     application of such provision to any person or circumstances shall be held
     invalid or unenforceable by a court of competent jurisdiction, such
     provision or application shall be unenforceable only to the extent of such
     invalidity or unenforceability, and the remainder of the provision held
     invalid or unenforceable and the application of such provision to persons
     or circumstances, other than the party as to which it is held invalid, and
     the remainder of this Agreement, shall not be affected.

          b. CAPACITY.  The covenants contained herein shall apply to
     Shareholder solely in his or her capacity as a shareholder of the Company,
     and no covenant contained herein shall apply to Shareholder in his or her
     capacity as a director or officer of the Company.

          c. COUNTERPARTS.  This Agreement may be executed in one or more
     counterparts, each of which shall be deemed to be an original but all of
     which together shall constitute one and the same instrument.

          d. HEADINGS.  All Section headings herein are for convenience of
     reference only and are not part of this Agreement, and no construction or
     reference shall be derived therefrom.

          e. CHOICE OF LAW.  THIS AGREEMENT SHALL BE DEEMED A CONTRACT MADE
     UNDER, AND FOR ALL PURPOSES SHALL BE CONSTRUED IN ACCORDANCE WITH, THE LAWS
     OF THE STATE OF CALIFORNIA, WITHOUT REFERENCE TO ITS CONFLICTS OF LAW
     PRINCIPLES.

          11. ATTORNEY'S FEES.  The prevailing party or parties in any
litigation, arbitration, mediation, bankruptcy, insolvency or other proceeding
("Proceeding") relating to the enforcement or interpretation of this Agreement
may recover from the unsuccessful party or parties all fees and disbursements of
counsel (including expert witness and other consultants' fees and costs)
relating to or arising out of (a) the Proceeding (whether or not the Proceeding
proceeds to judgment), and (b) any post-judgment or post-award proceeding
including, without limitation, one to enforce or collect any judgment or award
resulting from


                                         -5-

<PAGE>

the Proceeding.  All such judgments and awards shall contain a specific
provision for the recovery of all such subsequently incurred costs, expenses,
and fees and disbursements of counsel.


                                         -6-

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have executed and delivered
this Agreement as of the date first written above.


                                        WESTERN BANCORP
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    

                                        SANTA MONICA
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    

                                          Roy Doumani
                                         --------------------------------
                                         (Print or type name)


                                          /s/ Roy Doumani
                                         --------------------------------
                                         (Signature)


                                         -7-



<PAGE>

   
                                                                   EXHIBIT 9.5
    

                                SHAREHOLDER AGREEMENT


          Shareholder Agreement (the "Agreement"), dated as of April 16, 
1998, by and among (i) John J. Feldman, a shareholder (the "Shareholder") 
of Bank of Los Angeles, a California banking corporation (the "Company"), 
(ii) Western Bancorp, a California corporation ("Western") and (iii) Santa 
Monica Bank, a California banking corporation ("Santa Monica").  All terms 
used herein and not defined herein shall have the meanings assigned thereto 
in the Merger Agreement (defined below).

          Whereas, Western, Santa Monica and the Company have entered into an
Agreement and Plan of Merger, dated the date hereof (the "Merger Agreement"),
providing for the business combination transaction contemplated therein in which
the Company will merge with and into Santa Monica pursuant to the terms and
conditions of the Merger Agreement (the "Merger") and Western will pay
consideration to the Company's shareholders in the form of Western Common Stock;

          Whereas, the Shareholder owns the shares of Company Common Stock
identified on ANNEX I hereto (such shares, together with all shares of Company
Common Stock subsequently acquired by the Shareholder during the term of this
Agreement, being referred to as the "Shares"); and

          Whereas, in order to induce Western and Santa Monica to enter into the
Merger Agreement and in consideration of the substantial expenses incurred and
to be incurred by Western and Santa Monica in connection therewith, the
Shareholder, solely in such Shareholder's capacity as a shareholder of the
Company, has agreed to enter into and perform this Agreement.

          Now, therefore, for good and valuable consideration, the receipt,
sufficiency and adequacy of which are hereby acknowledged, the parties hereto
agree as follows:

          1. AGREEMENT TO VOTE SHARES.  Shareholder shall vote or cause to be
voted, or execute a written consent with respect to, the Shares (a) in favor of
adoption and approval of the Merger Agreement and the Merger and all
transactions relating thereto at every meeting of the shareholders of the
Company at which such matters are considered and at every adjournment thereof
and in connection with every proposal to take action by written consent with
respect thereto, and (b) against any other Acquisition Proposal at every meeting
of the shareholders of the Company at which such matters are considered and at
every adjournment thereof and in connection with every proposal to take action
by written consent with respect thereto.

<PAGE>

          2. NO VOTING TRUSTS.  Shareholder agrees that Shareholder will not,
nor will Shareholder permit any entity under Shareholder's control to, deposit
any Shares in a voting trust or subject the Shares to any agreement, arrangement
or understanding with respect to the voting of the Shares inconsistent with this
Agreement.

          3. LIMITATION ON SALES.  Except to a donee who agrees in writing to be
bound by the provisions of Section 1 hereof, during the term of this Agreement,
Shareholder agrees not to sell, assign, transfer or dispose of any of the
Shares.

          4. REPRESENTATIONS AND WARRANTIES OF SHAREHOLDER.  Shareholder
represents and warrants to and agrees with Western and Santa Monica as follows:

          a. CAPACITY.  Shareholder has all requisite capacity and authority to
     enter into and perform his or her obligations under this Agreement.

          b. BINDING AGREEMENT.  This Agreement constitutes the valid and
     legally binding obligation of Shareholder, subject to bankruptcy,
     insolvency, fraudulent transfer, reorganization, moratorium and similar
     laws of general applicability relating to or affecting creditors' rights
     and to general equity principles.

          c. NON-CONTRAVENTION.  The execution and delivery of this Agreement by
     Shareholder does not, and the performance by Shareholder of his or her
     obligations hereunder and the consummation by Shareholder of the
     transactions contemplated hereby will not, violate or conflict with, or
     constitute a default under, any agreement, instrument, contract or other
     obligation or any order, arbitration award, judgment or decree to which
     Shareholder is a party or by which Shareholder is bound, or any statute,
     rule or regulation to which Shareholder is subject or, in the event that
     Shareholder is a corporation, partnership, trust or other entity, any
     charter, bylaw or other organizational document of the Shareholder.

          d. OWNERSHIP OF SHARES.  Shareholder has good title to all of the
     Shares as of the date hereof, and, except as set forth on Annex A hereto,
     the Shares are so owned free and clear of any liens, security interests,
     charges or other encumbrances.

          5. DISCLOSURE; SOLICITATION.  Neither Shareholder nor any corporation,
partnership, trust or other entity controlled by Shareholder shall:

          a. at any time following the Effective Date, disclose confidential
     information regarding the Company to any third parties, except as required
     by law, regulation, a court order, in the defense of litigation for which
     the Company may be liable, or in any actions relating to this Agreement or
     the Merger Agreement and the transactions contemplated hereby or thereby;
     and


                                         -2-

<PAGE>

          b. for a period of two years following the Effective Date, solicit,
     directly or indirectly, on its own behalf or on behalf of any other person
     or entity, management personnel employed by Western or Santa Monica
     immediately after the Effective Time for employment with any other
     business;

PROVIDED, HOWEVER, that with respect to any of the matters covered in this
Section 5, to the extent that any restriction set forth in this Section 5 is
adjudicated to be invalid or unenforceable in any jurisdiction, the court making
such determination shall have the power to limit, construe or reduce the
duration, scope, activity or area of such provision to the extent necessary to
render such provision enforceable to the maximum extent permitted by applicable
law, such limited form to apply only with respect to the operation of such
provision in the particular jurisdiction in which such adjudication is made.

          6. SPECIFIC PERFORMANCE AND REMEDIES.  Shareholder acknowledges that
it will be impossible to measure in money the damage to Western or to Santa
Monica if Shareholder fails to comply with the obligations imposed by this
Agreement and that, in the event of any such failure, Western and Santa Monica
will not have an adequate remedy at law or in damages.  Accordingly, Shareholder
agrees that injunctive relief or other equitable remedy, in addition to remedies
at law or in damages, is the appropriate remedy for any such failure and will
not oppose the granting of such relief on the basis that Western or Santa Monica
have an adequate remedy at law.  Shareholder agrees that it will not seek, and
agrees to waive any requirement for, the securing or posting of a bond in
connection with Western or Santa Monica's seeking or obtaining such equitable
relief.  In addition to all other rights or remedies which Western or Santa
Monica may have against Shareholder in the event of a default in Shareholder's
performance of Shareholder's obligations under this Agreement, Shareholder shall
be liable to Western and Santa Monica for all litigation costs and attorneys'
fees incurred by Western and Santa Monica in connection with the enforcement of
any of its rights or remedies against Shareholder.  In addition, after
discussing the matter with Shareholder, Western and Santa Monica shall have the
right to inform any third party that Western and Santa Monica reasonably
believes to be, or to be contemplating, participating with Shareholder or
receiving from Shareholder assistance in violation of this Agreement, of the
terms of this Agreement and of the rights of Western and Santa Monica hereunder,
and that participation by any such persons with Shareholder in activities in
violation of Shareholder's agreement with Western and Santa Monica set forth in
this Agreement may give rise to claims by Western and Santa Monica against such
third party.

          7. TERM OF AGREEMENT; TERMINATION.  a.  The term of this Agreement
shall commence on the date hereof.

          b. This Agreement shall terminate upon the date, if any, of the
termination of the Merger Agreement prior to the Effective Time in accordance
with its terms.  Upon such termination, no party shall have any further
obligations or liabilities hereunder; PROVIDED, HOWEVER, such termination shall
not relieve any party from liability for any breach


                                         -3-

<PAGE>

of this Agreement PRIOR to such termination.  If this Agreement is terminated
pursuant to Section 8.01 of the Merger Agreement, so long as the Company honors
its applicable obligations under Section 8.03 of the Merger Agreement, no party
shall have any further obligations or liabilities under this Agreement.

          c.  If the Merger Agreement is not terminated prior to the Effective
Time, this Agreement (except for the provisions of Sections 4, 5(b), 6, 9 and
10, which shall survive the Effective Time), shall terminate upon the Effective
Time.  Sections 4, 5, 6, 9 and 10 shall terminate on the date two years after
the Effective Time.

          8. ENTIRE AGREEMENT.  This Agreement supersedes all prior agreements,
written or oral, among the parties hereto with respect to the subject matter
hereof and contains the entire agreement among the parties with respect to the
subject matter hereof.  This Agreement may not be amended, supplemented or
modified, and no provisions hereof may be modified or waived, except by an
instrument in writing signed by each party hereto.  No waiver of any provisions
hereof by either party shall be deemed a waiver of any other provisions hereof
by any such party, nor shall any such waiver be deemed a continuing waiver of
any provision hereof by such party.

          9. NOTICES.  All notices, requests, claims, demands or other
communications hereunder shall be in writing and shall be deemed given when
delivered personally, upon receipt of a transmission confirmation if sent by
telecopy or like transmission and on the next business day when sent by a
reputable overnight courier service to the parties at the following addresses
(or at such other address for a party as shall be specified by like notice):

          If to Western or Santa Monica:

          Western Bancorp
          1251 Westwood Blvd.
          Los Angeles, California  90024
          Telecopier:  (310) 477-8611
          Attention:  Matthew P. Wagner

          With a copy to:

          Sullivan & Cromwell
          444 South Flower Street
          Los Angeles, California  90071
          Telecopier:  (213) 683-0458
          Attention:  Stanley F. Farrar, Esq.


                                         -4-

<PAGE>

     If to the Shareholder:





          10. MISCELLANEOUS.

          a. SEVERABILITY.  If any provision of this Agreement or the
     application of such provision to any person or circumstances shall be held
     invalid or unenforceable by a court of competent jurisdiction, such
     provision or application shall be unenforceable only to the extent of such
     invalidity or unenforceability, and the remainder of the provision held
     invalid or unenforceable and the application of such provision to persons
     or circumstances, other than the party as to which it is held invalid, and
     the remainder of this Agreement, shall not be affected.

          b. CAPACITY.  The covenants contained herein shall apply to
     Shareholder solely in his or her capacity as a shareholder of the Company,
     and no covenant contained herein shall apply to Shareholder in his or her
     capacity as a director or officer of the Company.

          c. COUNTERPARTS.  This Agreement may be executed in one or more
     counterparts, each of which shall be deemed to be an original but all of
     which together shall constitute one and the same instrument.

          d. HEADINGS.  All Section headings herein are for convenience of
     reference only and are not part of this Agreement, and no construction or
     reference shall be derived therefrom.

          e. CHOICE OF LAW.  THIS AGREEMENT SHALL BE DEEMED A CONTRACT MADE
     UNDER, AND FOR ALL PURPOSES SHALL BE CONSTRUED IN ACCORDANCE WITH, THE LAWS
     OF THE STATE OF CALIFORNIA, WITHOUT REFERENCE TO ITS CONFLICTS OF LAW
     PRINCIPLES.

          11. ATTORNEY'S FEES.  The prevailing party or parties in any
litigation, arbitration, mediation, bankruptcy, insolvency or other proceeding
("Proceeding") relating to the enforcement or interpretation of this Agreement
may recover from the unsuccessful party or parties all fees and disbursements of
counsel (including expert witness and other consultants' fees and costs)
relating to or arising out of (a) the Proceeding (whether or not the Proceeding
proceeds to judgment), and (b) any post-judgment or post-award proceeding
including, without limitation, one to enforce or collect any judgment or award
resulting from


                                         -5-

<PAGE>

the Proceeding.  All such judgments and awards shall contain a specific
provision for the recovery of all such subsequently incurred costs, expenses,
and fees and disbursements of counsel.


                                         -6-

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have executed and delivered
this Agreement as of the date first written above.


                                        WESTERN BANCORP
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    

                                        SANTA MONICA
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    

                                          John J. Feldman
                                         --------------------------------
                                         (Print or type name)


                                          /s/ John J. Feldman
                                         --------------------------------
                                         (Signature)


                                         -7-



<PAGE>

   
                                                                    EXHIBIT 9.6
    

                                SHAREHOLDER AGREEMENT


          Shareholder Agreement (the "Agreement"), dated as of April 16, 
1998, by and among (i) Rickey Gelb, a shareholder (the "Shareholder") 
of Bank of Los Angeles, a California banking corporation (the "Company"), 
(ii) Western Bancorp, a California corporation ("Western") and (iii) Santa 
Monica Bank, a California banking corporation ("Santa Monica").  All terms 
used herein and not defined herein shall have the meanings assigned thereto 
in the Merger Agreement (defined below).

          Whereas, Western, Santa Monica and the Company have entered into an
Agreement and Plan of Merger, dated the date hereof (the "Merger Agreement"),
providing for the business combination transaction contemplated therein in which
the Company will merge with and into Santa Monica pursuant to the terms and
conditions of the Merger Agreement (the "Merger") and Western will pay
consideration to the Company's shareholders in the form of Western Common Stock;

          Whereas, the Shareholder owns the shares of Company Common Stock
identified on ANNEX I hereto (such shares, together with all shares of Company
Common Stock subsequently acquired by the Shareholder during the term of this
Agreement, being referred to as the "Shares"); and

          Whereas, in order to induce Western and Santa Monica to enter into the
Merger Agreement and in consideration of the substantial expenses incurred and
to be incurred by Western and Santa Monica in connection therewith, the
Shareholder, solely in such Shareholder's capacity as a shareholder of the
Company, has agreed to enter into and perform this Agreement.

          Now, therefore, for good and valuable consideration, the receipt,
sufficiency and adequacy of which are hereby acknowledged, the parties hereto
agree as follows:

          1. AGREEMENT TO VOTE SHARES.  Shareholder shall vote or cause to be
voted, or execute a written consent with respect to, the Shares (a) in favor of
adoption and approval of the Merger Agreement and the Merger and all
transactions relating thereto at every meeting of the shareholders of the
Company at which such matters are considered and at every adjournment thereof
and in connection with every proposal to take action by written consent with
respect thereto, and (b) against any other Acquisition Proposal at every meeting
of the shareholders of the Company at which such matters are considered and at
every adjournment thereof and in connection with every proposal to take action
by written consent with respect thereto.

<PAGE>

          2. NO VOTING TRUSTS.  Shareholder agrees that Shareholder will not,
nor will Shareholder permit any entity under Shareholder's control to, deposit
any Shares in a voting trust or subject the Shares to any agreement, arrangement
or understanding with respect to the voting of the Shares inconsistent with this
Agreement.

          3. LIMITATION ON SALES.  Except to a donee who agrees in writing to be
bound by the provisions of Section 1 hereof, during the term of this Agreement,
Shareholder agrees not to sell, assign, transfer or dispose of any of the
Shares.

          4. REPRESENTATIONS AND WARRANTIES OF SHAREHOLDER.  Shareholder
represents and warrants to and agrees with Western and Santa Monica as follows:

          a. CAPACITY.  Shareholder has all requisite capacity and authority to
     enter into and perform his or her obligations under this Agreement.

          b. BINDING AGREEMENT.  This Agreement constitutes the valid and
     legally binding obligation of Shareholder, subject to bankruptcy,
     insolvency, fraudulent transfer, reorganization, moratorium and similar
     laws of general applicability relating to or affecting creditors' rights
     and to general equity principles.

          c. NON-CONTRAVENTION.  The execution and delivery of this Agreement by
     Shareholder does not, and the performance by Shareholder of his or her
     obligations hereunder and the consummation by Shareholder of the
     transactions contemplated hereby will not, violate or conflict with, or
     constitute a default under, any agreement, instrument, contract or other
     obligation or any order, arbitration award, judgment or decree to which
     Shareholder is a party or by which Shareholder is bound, or any statute,
     rule or regulation to which Shareholder is subject or, in the event that
     Shareholder is a corporation, partnership, trust or other entity, any
     charter, bylaw or other organizational document of the Shareholder.

          d. OWNERSHIP OF SHARES.  Shareholder has good title to all of the
     Shares as of the date hereof, and, except as set forth on Annex A hereto,
     the Shares are so owned free and clear of any liens, security interests,
     charges or other encumbrances.

          5. DISCLOSURE; SOLICITATION.  Neither Shareholder nor any corporation,
partnership, trust or other entity controlled by Shareholder shall:

          a. at any time following the Effective Date, disclose confidential
     information regarding the Company to any third parties, except as required
     by law, regulation, a court order, in the defense of litigation for which
     the Company may be liable, or in any actions relating to this Agreement or
     the Merger Agreement and the transactions contemplated hereby or thereby;
     and


                                         -2-

<PAGE>

          b. for a period of two years following the Effective Date, solicit,
     directly or indirectly, on its own behalf or on behalf of any other person
     or entity, management personnel employed by Western or Santa Monica
     immediately after the Effective Time for employment with any other
     business;

PROVIDED, HOWEVER, that with respect to any of the matters covered in this
Section 5, to the extent that any restriction set forth in this Section 5 is
adjudicated to be invalid or unenforceable in any jurisdiction, the court making
such determination shall have the power to limit, construe or reduce the
duration, scope, activity or area of such provision to the extent necessary to
render such provision enforceable to the maximum extent permitted by applicable
law, such limited form to apply only with respect to the operation of such
provision in the particular jurisdiction in which such adjudication is made.

          6. SPECIFIC PERFORMANCE AND REMEDIES.  Shareholder acknowledges that
it will be impossible to measure in money the damage to Western or to Santa
Monica if Shareholder fails to comply with the obligations imposed by this
Agreement and that, in the event of any such failure, Western and Santa Monica
will not have an adequate remedy at law or in damages.  Accordingly, Shareholder
agrees that injunctive relief or other equitable remedy, in addition to remedies
at law or in damages, is the appropriate remedy for any such failure and will
not oppose the granting of such relief on the basis that Western or Santa Monica
have an adequate remedy at law.  Shareholder agrees that it will not seek, and
agrees to waive any requirement for, the securing or posting of a bond in
connection with Western or Santa Monica's seeking or obtaining such equitable
relief.  In addition to all other rights or remedies which Western or Santa
Monica may have against Shareholder in the event of a default in Shareholder's
performance of Shareholder's obligations under this Agreement, Shareholder shall
be liable to Western and Santa Monica for all litigation costs and attorneys'
fees incurred by Western and Santa Monica in connection with the enforcement of
any of its rights or remedies against Shareholder.  In addition, after
discussing the matter with Shareholder, Western and Santa Monica shall have the
right to inform any third party that Western and Santa Monica reasonably
believes to be, or to be contemplating, participating with Shareholder or
receiving from Shareholder assistance in violation of this Agreement, of the
terms of this Agreement and of the rights of Western and Santa Monica hereunder,
and that participation by any such persons with Shareholder in activities in
violation of Shareholder's agreement with Western and Santa Monica set forth in
this Agreement may give rise to claims by Western and Santa Monica against such
third party.

          7. TERM OF AGREEMENT; TERMINATION.  a.  The term of this Agreement
shall commence on the date hereof.

          b. This Agreement shall terminate upon the date, if any, of the
termination of the Merger Agreement prior to the Effective Time in accordance
with its terms.  Upon such termination, no party shall have any further
obligations or liabilities hereunder; PROVIDED, HOWEVER, such termination shall
not relieve any party from liability for any breach


                                         -3-

<PAGE>

of this Agreement PRIOR to such termination.  If this Agreement is terminated
pursuant to Section 8.01 of the Merger Agreement, so long as the Company honors
its applicable obligations under Section 8.03 of the Merger Agreement, no party
shall have any further obligations or liabilities under this Agreement.

          c.  If the Merger Agreement is not terminated prior to the Effective
Time, this Agreement (except for the provisions of Sections 4, 5(b), 6, 9 and
10, which shall survive the Effective Time), shall terminate upon the Effective
Time.  Sections 4, 5, 6, 9 and 10 shall terminate on the date two years after
the Effective Time.

          8. ENTIRE AGREEMENT.  This Agreement supersedes all prior agreements,
written or oral, among the parties hereto with respect to the subject matter
hereof and contains the entire agreement among the parties with respect to the
subject matter hereof.  This Agreement may not be amended, supplemented or
modified, and no provisions hereof may be modified or waived, except by an
instrument in writing signed by each party hereto.  No waiver of any provisions
hereof by either party shall be deemed a waiver of any other provisions hereof
by any such party, nor shall any such waiver be deemed a continuing waiver of
any provision hereof by such party.

          9. NOTICES.  All notices, requests, claims, demands or other
communications hereunder shall be in writing and shall be deemed given when
delivered personally, upon receipt of a transmission confirmation if sent by
telecopy or like transmission and on the next business day when sent by a
reputable overnight courier service to the parties at the following addresses
(or at such other address for a party as shall be specified by like notice):

          If to Western or Santa Monica:

          Western Bancorp
          1251 Westwood Blvd.
          Los Angeles, California  90024
          Telecopier:  (310) 477-8611
          Attention:  Matthew P. Wagner

          With a copy to:

          Sullivan & Cromwell
          444 South Flower Street
          Los Angeles, California  90071
          Telecopier:  (213) 683-0458
          Attention:  Stanley F. Farrar, Esq.


                                         -4-

<PAGE>

     If to the Shareholder:





          10. MISCELLANEOUS.

          a. SEVERABILITY.  If any provision of this Agreement or the
     application of such provision to any person or circumstances shall be held
     invalid or unenforceable by a court of competent jurisdiction, such
     provision or application shall be unenforceable only to the extent of such
     invalidity or unenforceability, and the remainder of the provision held
     invalid or unenforceable and the application of such provision to persons
     or circumstances, other than the party as to which it is held invalid, and
     the remainder of this Agreement, shall not be affected.

          b. CAPACITY.  The covenants contained herein shall apply to
     Shareholder solely in his or her capacity as a shareholder of the Company,
     and no covenant contained herein shall apply to Shareholder in his or her
     capacity as a director or officer of the Company.

          c. COUNTERPARTS.  This Agreement may be executed in one or more
     counterparts, each of which shall be deemed to be an original but all of
     which together shall constitute one and the same instrument.

          d. HEADINGS.  All Section headings herein are for convenience of
     reference only and are not part of this Agreement, and no construction or
     reference shall be derived therefrom.

          e. CHOICE OF LAW.  THIS AGREEMENT SHALL BE DEEMED A CONTRACT MADE
     UNDER, AND FOR ALL PURPOSES SHALL BE CONSTRUED IN ACCORDANCE WITH, THE LAWS
     OF THE STATE OF CALIFORNIA, WITHOUT REFERENCE TO ITS CONFLICTS OF LAW
     PRINCIPLES.

          11. ATTORNEY'S FEES.  The prevailing party or parties in any
litigation, arbitration, mediation, bankruptcy, insolvency or other proceeding
("Proceeding") relating to the enforcement or interpretation of this Agreement
may recover from the unsuccessful party or parties all fees and disbursements of
counsel (including expert witness and other consultants' fees and costs)
relating to or arising out of (a) the Proceeding (whether or not the Proceeding
proceeds to judgment), and (b) any post-judgment or post-award proceeding
including, without limitation, one to enforce or collect any judgment or award
resulting from


                                         -5-

<PAGE>

the Proceeding.  All such judgments and awards shall contain a specific
provision for the recovery of all such subsequently incurred costs, expenses,
and fees and disbursements of counsel.


                                         -6-

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have executed and delivered
this Agreement as of the date first written above.


                                        WESTERN BANCORP
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    

                                        SANTA MONICA
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    

                                          Rickey Gelb
                                         --------------------------------
                                         (Print or type name)


                                          /s/ Rickey Gelb
                                         --------------------------------
                                         (Signature)


                                         -7-



<PAGE>

   
                                                                    EXHIBIT 9.7
    

                                SHAREHOLDER AGREEMENT


          Shareholder Agreement (the "Agreement"), dated as of April 16, 
1998, by and among (i) Robert Jacobsen, a shareholder (the "Shareholder") 
of Bank of Los Angeles, a California banking corporation (the "Company"), 
(ii) Western Bancorp, a California corporation ("Western") and (iii) Santa 
Monica Bank, a California banking corporation ("Santa Monica").  All terms 
used herein and not defined herein shall have the meanings assigned thereto 
in the Merger Agreement (defined below).

          Whereas, Western, Santa Monica and the Company have entered into an
Agreement and Plan of Merger, dated the date hereof (the "Merger Agreement"),
providing for the business combination transaction contemplated therein in which
the Company will merge with and into Santa Monica pursuant to the terms and
conditions of the Merger Agreement (the "Merger") and Western will pay
consideration to the Company's shareholders in the form of Western Common Stock;

          Whereas, the Shareholder owns the shares of Company Common Stock
identified on ANNEX I hereto (such shares, together with all shares of Company
Common Stock subsequently acquired by the Shareholder during the term of this
Agreement, being referred to as the "Shares"); and

          Whereas, in order to induce Western and Santa Monica to enter into the
Merger Agreement and in consideration of the substantial expenses incurred and
to be incurred by Western and Santa Monica in connection therewith, the
Shareholder, solely in such Shareholder's capacity as a shareholder of the
Company, has agreed to enter into and perform this Agreement.

          Now, therefore, for good and valuable consideration, the receipt,
sufficiency and adequacy of which are hereby acknowledged, the parties hereto
agree as follows:

          1. AGREEMENT TO VOTE SHARES.  Shareholder shall vote or cause to be
voted, or execute a written consent with respect to, the Shares (a) in favor of
adoption and approval of the Merger Agreement and the Merger and all
transactions relating thereto at every meeting of the shareholders of the
Company at which such matters are considered and at every adjournment thereof
and in connection with every proposal to take action by written consent with
respect thereto, and (b) against any other Acquisition Proposal at every meeting
of the shareholders of the Company at which such matters are considered and at
every adjournment thereof and in connection with every proposal to take action
by written consent with respect thereto.

<PAGE>

          2. NO VOTING TRUSTS.  Shareholder agrees that Shareholder will not,
nor will Shareholder permit any entity under Shareholder's control to, deposit
any Shares in a voting trust or subject the Shares to any agreement, arrangement
or understanding with respect to the voting of the Shares inconsistent with this
Agreement.

          3. LIMITATION ON SALES.  Except to a donee who agrees in writing to be
bound by the provisions of Section 1 hereof, during the term of this Agreement,
Shareholder agrees not to sell, assign, transfer or dispose of any of the
Shares.

          4. REPRESENTATIONS AND WARRANTIES OF SHAREHOLDER.  Shareholder
represents and warrants to and agrees with Western and Santa Monica as follows:

          a. CAPACITY.  Shareholder has all requisite capacity and authority to
     enter into and perform his or her obligations under this Agreement.

          b. BINDING AGREEMENT.  This Agreement constitutes the valid and
     legally binding obligation of Shareholder, subject to bankruptcy,
     insolvency, fraudulent transfer, reorganization, moratorium and similar
     laws of general applicability relating to or affecting creditors' rights
     and to general equity principles.

          c. NON-CONTRAVENTION.  The execution and delivery of this Agreement by
     Shareholder does not, and the performance by Shareholder of his or her
     obligations hereunder and the consummation by Shareholder of the
     transactions contemplated hereby will not, violate or conflict with, or
     constitute a default under, any agreement, instrument, contract or other
     obligation or any order, arbitration award, judgment or decree to which
     Shareholder is a party or by which Shareholder is bound, or any statute,
     rule or regulation to which Shareholder is subject or, in the event that
     Shareholder is a corporation, partnership, trust or other entity, any
     charter, bylaw or other organizational document of the Shareholder.

          d. OWNERSHIP OF SHARES.  Shareholder has good title to all of the
     Shares as of the date hereof, and, except as set forth on Annex A hereto,
     the Shares are so owned free and clear of any liens, security interests,
     charges or other encumbrances.

          5. DISCLOSURE; SOLICITATION.  Neither Shareholder nor any corporation,
partnership, trust or other entity controlled by Shareholder shall:

          a. at any time following the Effective Date, disclose confidential
     information regarding the Company to any third parties, except as required
     by law, regulation, a court order, in the defense of litigation for which
     the Company may be liable, or in any actions relating to this Agreement or
     the Merger Agreement and the transactions contemplated hereby or thereby;
     and


                                         -2-

<PAGE>

          b. for a period of two years following the Effective Date, solicit,
     directly or indirectly, on its own behalf or on behalf of any other person
     or entity, management personnel employed by Western or Santa Monica
     immediately after the Effective Time for employment with any other
     business;

PROVIDED, HOWEVER, that with respect to any of the matters covered in this
Section 5, to the extent that any restriction set forth in this Section 5 is
adjudicated to be invalid or unenforceable in any jurisdiction, the court making
such determination shall have the power to limit, construe or reduce the
duration, scope, activity or area of such provision to the extent necessary to
render such provision enforceable to the maximum extent permitted by applicable
law, such limited form to apply only with respect to the operation of such
provision in the particular jurisdiction in which such adjudication is made.

          6. SPECIFIC PERFORMANCE AND REMEDIES.  Shareholder acknowledges that
it will be impossible to measure in money the damage to Western or to Santa
Monica if Shareholder fails to comply with the obligations imposed by this
Agreement and that, in the event of any such failure, Western and Santa Monica
will not have an adequate remedy at law or in damages.  Accordingly, Shareholder
agrees that injunctive relief or other equitable remedy, in addition to remedies
at law or in damages, is the appropriate remedy for any such failure and will
not oppose the granting of such relief on the basis that Western or Santa Monica
have an adequate remedy at law.  Shareholder agrees that it will not seek, and
agrees to waive any requirement for, the securing or posting of a bond in
connection with Western or Santa Monica's seeking or obtaining such equitable
relief.  In addition to all other rights or remedies which Western or Santa
Monica may have against Shareholder in the event of a default in Shareholder's
performance of Shareholder's obligations under this Agreement, Shareholder shall
be liable to Western and Santa Monica for all litigation costs and attorneys'
fees incurred by Western and Santa Monica in connection with the enforcement of
any of its rights or remedies against Shareholder.  In addition, after
discussing the matter with Shareholder, Western and Santa Monica shall have the
right to inform any third party that Western and Santa Monica reasonably
believes to be, or to be contemplating, participating with Shareholder or
receiving from Shareholder assistance in violation of this Agreement, of the
terms of this Agreement and of the rights of Western and Santa Monica hereunder,
and that participation by any such persons with Shareholder in activities in
violation of Shareholder's agreement with Western and Santa Monica set forth in
this Agreement may give rise to claims by Western and Santa Monica against such
third party.

          7. TERM OF AGREEMENT; TERMINATION.  a.  The term of this Agreement
shall commence on the date hereof.

          b. This Agreement shall terminate upon the date, if any, of the
termination of the Merger Agreement prior to the Effective Time in accordance
with its terms.  Upon such termination, no party shall have any further
obligations or liabilities hereunder; PROVIDED, HOWEVER, such termination shall
not relieve any party from liability for any breach


                                         -3-

<PAGE>

of this Agreement PRIOR to such termination.  If this Agreement is terminated
pursuant to Section 8.01 of the Merger Agreement, so long as the Company honors
its applicable obligations under Section 8.03 of the Merger Agreement, no party
shall have any further obligations or liabilities under this Agreement.

          c.  If the Merger Agreement is not terminated prior to the Effective
Time, this Agreement (except for the provisions of Sections 4, 5(b), 6, 9 and
10, which shall survive the Effective Time), shall terminate upon the Effective
Time.  Sections 4, 5, 6, 9 and 10 shall terminate on the date two years after
the Effective Time.

          8. ENTIRE AGREEMENT.  This Agreement supersedes all prior agreements,
written or oral, among the parties hereto with respect to the subject matter
hereof and contains the entire agreement among the parties with respect to the
subject matter hereof.  This Agreement may not be amended, supplemented or
modified, and no provisions hereof may be modified or waived, except by an
instrument in writing signed by each party hereto.  No waiver of any provisions
hereof by either party shall be deemed a waiver of any other provisions hereof
by any such party, nor shall any such waiver be deemed a continuing waiver of
any provision hereof by such party.

          9. NOTICES.  All notices, requests, claims, demands or other
communications hereunder shall be in writing and shall be deemed given when
delivered personally, upon receipt of a transmission confirmation if sent by
telecopy or like transmission and on the next business day when sent by a
reputable overnight courier service to the parties at the following addresses
(or at such other address for a party as shall be specified by like notice):

          If to Western or Santa Monica:

          Western Bancorp
          1251 Westwood Blvd.
          Los Angeles, California  90024
          Telecopier:  (310) 477-8611
          Attention:  Matthew P. Wagner

          With a copy to:

          Sullivan & Cromwell
          444 South Flower Street
          Los Angeles, California  90071
          Telecopier:  (213) 683-0458
          Attention:  Stanley F. Farrar, Esq.


                                         -4-

<PAGE>

     If to the Shareholder:





          10. MISCELLANEOUS.

          a. SEVERABILITY.  If any provision of this Agreement or the
     application of such provision to any person or circumstances shall be held
     invalid or unenforceable by a court of competent jurisdiction, such
     provision or application shall be unenforceable only to the extent of such
     invalidity or unenforceability, and the remainder of the provision held
     invalid or unenforceable and the application of such provision to persons
     or circumstances, other than the party as to which it is held invalid, and
     the remainder of this Agreement, shall not be affected.

          b. CAPACITY.  The covenants contained herein shall apply to
     Shareholder solely in his or her capacity as a shareholder of the Company,
     and no covenant contained herein shall apply to Shareholder in his or her
     capacity as a director or officer of the Company.

          c. COUNTERPARTS.  This Agreement may be executed in one or more
     counterparts, each of which shall be deemed to be an original but all of
     which together shall constitute one and the same instrument.

          d. HEADINGS.  All Section headings herein are for convenience of
     reference only and are not part of this Agreement, and no construction or
     reference shall be derived therefrom.

          e. CHOICE OF LAW.  THIS AGREEMENT SHALL BE DEEMED A CONTRACT MADE
     UNDER, AND FOR ALL PURPOSES SHALL BE CONSTRUED IN ACCORDANCE WITH, THE LAWS
     OF THE STATE OF CALIFORNIA, WITHOUT REFERENCE TO ITS CONFLICTS OF LAW
     PRINCIPLES.

          11. ATTORNEY'S FEES.  The prevailing party or parties in any
litigation, arbitration, mediation, bankruptcy, insolvency or other proceeding
("Proceeding") relating to the enforcement or interpretation of this Agreement
may recover from the unsuccessful party or parties all fees and disbursements of
counsel (including expert witness and other consultants' fees and costs)
relating to or arising out of (a) the Proceeding (whether or not the Proceeding
proceeds to judgment), and (b) any post-judgment or post-award proceeding
including, without limitation, one to enforce or collect any judgment or award
resulting from


                                         -5-

<PAGE>

the Proceeding.  All such judgments and awards shall contain a specific
provision for the recovery of all such subsequently incurred costs, expenses,
and fees and disbursements of counsel.


                                         -6-

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have executed and delivered
this Agreement as of the date first written above.


                                        WESTERN BANCORP
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    

                                        SANTA MONICA
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    

                                          Robert G. Jacobsen
                                         --------------------------------
                                         (Print or type name)


                                          /s/ Robert G. Jacobsen
                                         --------------------------------
                                         (Signature)


                                         -7-



<PAGE>

   
                                                                    EXHIBIT 9.8
    

                                SHAREHOLDER AGREEMENT


          Shareholder Agreement (the "Agreement"), dated as of April 16, 1998,
by and among (i) Wendy R. Moskal, a shareholder (the "Shareholder") of Bank of
Los Angeles, a California banking corporation (the "Company"), (ii) Western
Bancorp, a California corporation ("Western") and (iii) Santa Monica Bank, a
California banking corporation ("Santa Monica").  All terms used herein and not
defined herein shall have the meanings assigned thereto in the Merger Agreement
(defined below).

          Whereas, Western, Santa Monica and the Company have entered into an
Agreement and Plan of Merger, dated the date hereof (the "Merger Agreement"),
providing for the business combination transaction contemplated therein in which
the Company will merge with and into Santa Monica pursuant to the terms and
conditions of the Merger Agreement (the "Merger") and Western will pay
consideration to the Company's shareholders in the form of Western Common Stock;

          Whereas, the Shareholder owns the shares of Company Common Stock
identified on ANNEX I hereto (such shares, together with all shares of Company
Common Stock subsequently acquired by the Shareholder during the term of this
Agreement, being referred to as the "Shares"); and

          Whereas, in order to induce Western and Santa Monica to enter into the
Merger Agreement and in consideration of the substantial expenses incurred and
to be incurred by Western and Santa Monica in connection therewith, the
Shareholder, solely in such Shareholder's capacity as a shareholder of the
Company, has agreed to enter into and perform this Agreement.

          Now, therefore, for good and valuable consideration, the receipt,
sufficiency and adequacy of which are hereby acknowledged, the parties hereto
agree as follows:

          1. AGREEMENT TO VOTE SHARES.  Shareholder shall vote or cause to be
voted, or execute a written consent with respect to, the Shares (a) in favor of
adoption and approval of the Merger Agreement and the Merger and all
transactions relating thereto at every meeting of the shareholders of the
Company at which such matters are considered and at every adjournment thereof
and in connection with every proposal to take action by written consent with
respect thereto, and (b) against any other Acquisition Proposal at every meeting
of the shareholders of the Company at which such matters are considered and at
every adjournment thereof and in connection with every proposal to take action
by written consent with respect thereto.

<PAGE>

          2. NO VOTING TRUSTS.  Shareholder agrees that Shareholder will not,
nor will Shareholder permit any entity under Shareholder's control to, deposit
any Shares in a voting trust or subject the Shares to any agreement, arrangement
or understanding with respect to the voting of the Shares inconsistent with this
Agreement.

          3. LIMITATION ON SALES.  Except to a donee who agrees in writing to be
bound by the provisions of Section 1 hereof, during the term of this Agreement,
Shareholder agrees not to sell, assign, transfer or dispose of any of the
Shares.

          4. REPRESENTATIONS AND WARRANTIES OF SHAREHOLDER.  Shareholder
represents and warrants to and agrees with Western and Santa Monica as follows:

          a. CAPACITY.  Shareholder has all requisite capacity and authority to
     enter into and perform his or her obligations under this Agreement.

          b. BINDING AGREEMENT.  This Agreement constitutes the valid and
     legally binding obligation of Shareholder, subject to bankruptcy,
     insolvency, fraudulent transfer, reorganization, moratorium and similar
     laws of general applicability relating to or affecting creditors' rights
     and to general equity principles.

          c. NON-CONTRAVENTION.  The execution and delivery of this Agreement by
     Shareholder does not, and the performance by Shareholder of his or her
     obligations hereunder and the consummation by Shareholder of the
     transactions contemplated hereby will not, violate or conflict with, or
     constitute a default under, any agreement, instrument, contract or other
     obligation or any order, arbitration award, judgment or decree to which
     Shareholder is a party or by which Shareholder is bound, or any statute,
     rule or regulation to which Shareholder is subject or, in the event that
     Shareholder is a corporation, partnership, trust or other entity, any
     charter, bylaw or other organizational document of the Shareholder.

          d. OWNERSHIP OF SHARES.  Shareholder has good title to all of the
     Shares as of the date hereof, and, except as set forth on Annex A hereto,
     the Shares are so owned free and clear of any liens, security interests,
     charges or other encumbrances.

          5. DISCLOSURE; SOLICITATION.  Neither Shareholder nor any corporation,
partnership, trust or other entity controlled by Shareholder shall:

          a. at any time following the Effective Date, disclose confidential
     information regarding the Company to any third parties, except as required
     by law, regulation, a court order, in the defense of litigation for which
     the Company may be liable, or in any actions relating to this Agreement or
     the Merger Agreement and the transactions contemplated hereby or thereby;
     and


                                         -2-

<PAGE>

          b. for a period of two years following the Effective Date, solicit,
     directly or indirectly, on its own behalf or on behalf of any other person
     or entity, management personnel employed by Western or Santa Monica
     immediately after the Effective Time for employment with any other
     business;

PROVIDED, HOWEVER, that with respect to any of the matters covered in this
Section 5, to the extent that any restriction set forth in this Section 5 is
adjudicated to be invalid or unenforceable in any jurisdiction, the court making
such determination shall have the power to limit, construe or reduce the
duration, scope, activity or area of such provision to the extent necessary to
render such provision enforceable to the maximum extent permitted by applicable
law, such limited form to apply only with respect to the operation of such
provision in the particular jurisdiction in which such adjudication is made.

          6. SPECIFIC PERFORMANCE AND REMEDIES.  Shareholder acknowledges that
it will be impossible to measure in money the damage to Western or to Santa
Monica if Shareholder fails to comply with the obligations imposed by this
Agreement and that, in the event of any such failure, Western and Santa Monica
will not have an adequate remedy at law or in damages.  Accordingly, Shareholder
agrees that injunctive relief or other equitable remedy, in addition to remedies
at law or in damages, is the appropriate remedy for any such failure and will
not oppose the granting of such relief on the basis that Western or Santa Monica
have an adequate remedy at law.  Shareholder agrees that it will not seek, and
agrees to waive any requirement for, the securing or posting of a bond in
connection with Western or Santa Monica's seeking or obtaining such equitable
relief.  In addition to all other rights or remedies which Western or Santa
Monica may have against Shareholder in the event of a default in Shareholder's
performance of Shareholder's obligations under this Agreement, Shareholder shall
be liable to Western and Santa Monica for all litigation costs and attorneys'
fees incurred by Western and Santa Monica in connection with the enforcement of
any of its rights or remedies against Shareholder.  In addition, after
discussing the matter with Shareholder, Western and Santa Monica shall have the
right to inform any third party that Western and Santa Monica reasonably
believes to be, or to be contemplating, participating with Shareholder or
receiving from Shareholder assistance in violation of this Agreement, of the
terms of this Agreement and of the rights of Western and Santa Monica hereunder,
and that participation by any such persons with Shareholder in activities in
violation of Shareholder's agreement with Western and Santa Monica set forth in
this Agreement may give rise to claims by Western and Santa Monica against such
third party.

          7. TERM OF AGREEMENT; TERMINATION.  a.  The term of this Agreement
shall commence on the date hereof.

          b. This Agreement shall terminate upon the date, if any, of the
termination of the Merger Agreement prior to the Effective Time in accordance
with its terms.  Upon such termination, no party shall have any further
obligations or liabilities hereunder; PROVIDED, HOWEVER, such termination shall
not relieve any party from liability for any breach


                                         -3-

<PAGE>

of this Agreement PRIOR to such termination.  If this Agreement is terminated
pursuant to Section 8.01 of the Merger Agreement, so long as the Company honors
its applicable obligations under Section 8.03 of the Merger Agreement, no party
shall have any further obligations or liabilities under this Agreement.

          c.  If the Merger Agreement is not terminated prior to the Effective
Time, this Agreement (except for the provisions of Sections 4, 5(b), 6, 9 and
10, which shall survive the Effective Time), shall terminate upon the Effective
Time.  Sections 4, 5, 6, 9 and 10 shall terminate on the date two years after
the Effective Time.

          8. ENTIRE AGREEMENT.  This Agreement supersedes all prior agreements,
written or oral, among the parties hereto with respect to the subject matter
hereof and contains the entire agreement among the parties with respect to the
subject matter hereof.  This Agreement may not be amended, supplemented or
modified, and no provisions hereof may be modified or waived, except by an
instrument in writing signed by each party hereto.  No waiver of any provisions
hereof by either party shall be deemed a waiver of any other provisions hereof
by any such party, nor shall any such waiver be deemed a continuing waiver of
any provision hereof by such party.

          9. NOTICES.  All notices, requests, claims, demands or other
communications hereunder shall be in writing and shall be deemed given when
delivered personally, upon receipt of a transmission confirmation if sent by
telecopy or like transmission and on the next business day when sent by a
reputable overnight courier service to the parties at the following addresses
(or at such other address for a party as shall be specified by like notice):

          If to Western or Santa Monica:

          Western Bancorp
          1251 Westwood Blvd.
          Los Angeles, California  90024
          Telecopier:  (310) 477-8611
          Attention:  Matthew P. Wagner

          With a copy to:

          Sullivan & Cromwell
          444 South Flower Street
          Los Angeles, California  90071
          Telecopier:  (213) 683-0458
          Attention:  Stanley F. Farrar, Esq.


                                         -4-

<PAGE>

     If to the Shareholder:





          10. MISCELLANEOUS.

          a. SEVERABILITY.  If any provision of this Agreement or the
     application of such provision to any person or circumstances shall be held
     invalid or unenforceable by a court of competent jurisdiction, such
     provision or application shall be unenforceable only to the extent of such
     invalidity or unenforceability, and the remainder of the provision held
     invalid or unenforceable and the application of such provision to persons
     or circumstances, other than the party as to which it is held invalid, and
     the remainder of this Agreement, shall not be affected.

          b. CAPACITY.  The covenants contained herein shall apply to
     Shareholder solely in his or her capacity as a shareholder of the Company,
     and no covenant contained herein shall apply to Shareholder in his or her
     capacity as a director or officer of the Company.

          c. COUNTERPARTS.  This Agreement may be executed in one or more
     counterparts, each of which shall be deemed to be an original but all of
     which together shall constitute one and the same instrument.

          d. HEADINGS.  All Section headings herein are for convenience of
     reference only and are not part of this Agreement, and no construction or
     reference shall be derived therefrom.

          e. CHOICE OF LAW.  THIS AGREEMENT SHALL BE DEEMED A CONTRACT MADE
     UNDER, AND FOR ALL PURPOSES SHALL BE CONSTRUED IN ACCORDANCE WITH, THE LAWS
     OF THE STATE OF CALIFORNIA, WITHOUT REFERENCE TO ITS CONFLICTS OF LAW
     PRINCIPLES.

          11. ATTORNEY'S FEES.  The prevailing party or parties in any
litigation, arbitration, mediation, bankruptcy, insolvency or other proceeding
("Proceeding") relating to the enforcement or interpretation of this Agreement
may recover from the unsuccessful party or parties all fees and disbursements of
counsel (including expert witness and other consultants' fees and costs)
relating to or arising out of (a) the Proceeding (whether or not the Proceeding
proceeds to judgment), and (b) any post-judgment or post-award proceeding
including, without limitation, one to enforce or collect any judgment or award
resulting from


                                         -5-

<PAGE>

the Proceeding.  All such judgments and awards shall contain a specific
provision for the recovery of all such subsequently incurred costs, expenses,
and fees and disbursements of counsel.


                                         -6-

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have executed and delivered
this Agreement as of the date first written above.


                                        WESTERN BANCORP
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    

                                        SANTA MONICA
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    


                                         --------------------------------
                                         (Print or type name)


                                          /s/ Wendy R. Moskal
                                         --------------------------------
                                         (Signature)


                                         -7-



<PAGE>

   
                                                                    EXHIBIT 9.9
    

                                SHAREHOLDER AGREEMENT


          Shareholder Agreement (the "Agreement"), dated as of April 16, 1998,
by and among (i) John R. Newhouse, a shareholder (the "Shareholder") of Bank of
Los Angeles, a California banking corporation (the "Company"), (ii) Western
Bancorp, a California corporation ("Western") and (iii) Santa Monica Bank, a
California banking corporation ("Santa Monica").  All terms used herein and not
defined herein shall have the meanings assigned thereto in the Merger Agreement
(defined below).

          Whereas, Western, Santa Monica and the Company have entered into an
Agreement and Plan of Merger, dated the date hereof (the "Merger Agreement"),
providing for the business combination transaction contemplated therein in which
the Company will merge with and into Santa Monica pursuant to the terms and
conditions of the Merger Agreement (the "Merger") and Western will pay
consideration to the Company's shareholders in the form of Western Common Stock;

          Whereas, the Shareholder owns the shares of Company Common Stock
identified on ANNEX I hereto (such shares, together with all shares of Company
Common Stock subsequently acquired by the Shareholder during the term of this
Agreement, being referred to as the "Shares"); and

          Whereas, in order to induce Western and Santa Monica to enter into the
Merger Agreement and in consideration of the substantial expenses incurred and
to be incurred by Western and Santa Monica in connection therewith, the
Shareholder, solely in such Shareholder's capacity as a shareholder of the
Company, has agreed to enter into and perform this Agreement.

          Now, therefore, for good and valuable consideration, the receipt,
sufficiency and adequacy of which are hereby acknowledged, the parties hereto
agree as follows:

          1. AGREEMENT TO VOTE SHARES.  Shareholder shall vote or cause to be
voted, or execute a written consent with respect to, the Shares (a) in favor of
adoption and approval of the Merger Agreement and the Merger and all
transactions relating thereto at every meeting of the shareholders of the
Company at which such matters are considered and at every adjournment thereof
and in connection with every proposal to take action by written consent with
respect thereto, and (b) against any other Acquisition Proposal at every meeting
of the shareholders of the Company at which such matters are considered and at
every adjournment thereof and in connection with every proposal to take action
by written consent with respect thereto.

<PAGE>

          2. NO VOTING TRUSTS.  Shareholder agrees that Shareholder will not,
nor will Shareholder permit any entity under Shareholder's control to, deposit
any Shares in a voting trust or subject the Shares to any agreement, arrangement
or understanding with respect to the voting of the Shares inconsistent with this
Agreement.

          3. LIMITATION ON SALES.  Except to a donee who agrees in writing to be
bound by the provisions of Section 1 hereof, during the term of this Agreement,
Shareholder agrees not to sell, assign, transfer or dispose of any of the
Shares.

          4. REPRESENTATIONS AND WARRANTIES OF SHAREHOLDER.  Shareholder
represents and warrants to and agrees with Western and Santa Monica as follows:

          a. CAPACITY.  Shareholder has all requisite capacity and authority to
     enter into and perform his or her obligations under this Agreement.

          b. BINDING AGREEMENT.  This Agreement constitutes the valid and
     legally binding obligation of Shareholder, subject to bankruptcy,
     insolvency, fraudulent transfer, reorganization, moratorium and similar
     laws of general applicability relating to or affecting creditors' rights
     and to general equity principles.

          c. NON-CONTRAVENTION.  The execution and delivery of this Agreement by
     Shareholder does not, and the performance by Shareholder of his or her
     obligations hereunder and the consummation by Shareholder of the
     transactions contemplated hereby will not, violate or conflict with, or
     constitute a default under, any agreement, instrument, contract or other
     obligation or any order, arbitration award, judgment or decree to which
     Shareholder is a party or by which Shareholder is bound, or any statute,
     rule or regulation to which Shareholder is subject or, in the event that
     Shareholder is a corporation, partnership, trust or other entity, any
     charter, bylaw or other organizational document of the Shareholder.

          d. OWNERSHIP OF SHARES.  Shareholder has good title to all of the
     Shares as of the date hereof, and, except as set forth on Annex A hereto,
     the Shares are so owned free and clear of any liens, security interests,
     charges or other encumbrances.

          5. DISCLOSURE; SOLICITATION.  Neither Shareholder nor any corporation,
partnership, trust or other entity controlled by Shareholder shall:

          a. at any time following the Effective Date, disclose confidential
     information regarding the Company to any third parties, except as required
     by law, regulation, a court order, in the defense of litigation for which
     the Company may be liable, or in any actions relating to this Agreement or
     the Merger Agreement and the transactions contemplated hereby or thereby;
     and


                                         -2-

<PAGE>

          b. for a period of two years following the Effective Date, solicit,
     directly or indirectly, on its own behalf or on behalf of any other person
     or entity, management personnel employed by Western or Santa Monica
     immediately after the Effective Time for employment with any other
     business;

PROVIDED, HOWEVER, that with respect to any of the matters covered in this
Section 5, to the extent that any restriction set forth in this Section 5 is
adjudicated to be invalid or unenforceable in any jurisdiction, the court making
such determination shall have the power to limit, construe or reduce the
duration, scope, activity or area of such provision to the extent necessary to
render such provision enforceable to the maximum extent permitted by applicable
law, such limited form to apply only with respect to the operation of such
provision in the particular jurisdiction in which such adjudication is made.

          6. SPECIFIC PERFORMANCE AND REMEDIES.  Shareholder acknowledges that
it will be impossible to measure in money the damage to Western or to Santa
Monica if Shareholder fails to comply with the obligations imposed by this
Agreement and that, in the event of any such failure, Western and Santa Monica
will not have an adequate remedy at law or in damages.  Accordingly, Shareholder
agrees that injunctive relief or other equitable remedy, in addition to remedies
at law or in damages, is the appropriate remedy for any such failure and will
not oppose the granting of such relief on the basis that Western or Santa Monica
have an adequate remedy at law.  Shareholder agrees that it will not seek, and
agrees to waive any requirement for, the securing or posting of a bond in
connection with Western or Santa Monica's seeking or obtaining such equitable
relief.  In addition to all other rights or remedies which Western or Santa
Monica may have against Shareholder in the event of a default in Shareholder's
performance of Shareholder's obligations under this Agreement, Shareholder shall
be liable to Western and Santa Monica for all litigation costs and attorneys'
fees incurred by Western and Santa Monica in connection with the enforcement of
any of its rights or remedies against Shareholder.  In addition, after
discussing the matter with Shareholder, Western and Santa Monica shall have the
right to inform any third party that Western and Santa Monica reasonably
believes to be, or to be contemplating, participating with Shareholder or
receiving from Shareholder assistance in violation of this Agreement, of the
terms of this Agreement and of the rights of Western and Santa Monica hereunder,
and that participation by any such persons with Shareholder in activities in
violation of Shareholder's agreement with Western and Santa Monica set forth in
this Agreement may give rise to claims by Western and Santa Monica against such
third party.

          7. TERM OF AGREEMENT; TERMINATION.  a.  The term of this Agreement
shall commence on the date hereof.

          b. This Agreement shall terminate upon the date, if any, of the
termination of the Merger Agreement prior to the Effective Time in accordance
with its terms.  Upon such termination, no party shall have any further
obligations or liabilities hereunder; PROVIDED, HOWEVER, such termination shall
not relieve any party from liability for any breach


                                         -3-

<PAGE>

of this Agreement PRIOR to such termination.  If this Agreement is terminated
pursuant to Section 8.01 of the Merger Agreement, so long as the Company honors
its applicable obligations under Section 8.03 of the Merger Agreement, no party
shall have any further obligations or liabilities under this Agreement.

          c.  If the Merger Agreement is not terminated prior to the Effective
Time, this Agreement (except for the provisions of Sections 4, 5(b), 6, 9 and
10, which shall survive the Effective Time), shall terminate upon the Effective
Time.  Sections 4, 5, 6, 9 and 10 shall terminate on the date two years after
the Effective Time.

          8. ENTIRE AGREEMENT.  This Agreement supersedes all prior agreements,
written or oral, among the parties hereto with respect to the subject matter
hereof and contains the entire agreement among the parties with respect to the
subject matter hereof.  This Agreement may not be amended, supplemented or
modified, and no provisions hereof may be modified or waived, except by an
instrument in writing signed by each party hereto.  No waiver of any provisions
hereof by either party shall be deemed a waiver of any other provisions hereof
by any such party, nor shall any such waiver be deemed a continuing waiver of
any provision hereof by such party.

          9. NOTICES.  All notices, requests, claims, demands or other
communications hereunder shall be in writing and shall be deemed given when
delivered personally, upon receipt of a transmission confirmation if sent by
telecopy or like transmission and on the next business day when sent by a
reputable overnight courier service to the parties at the following addresses
(or at such other address for a party as shall be specified by like notice):

          If to Western or Santa Monica:

          Western Bancorp
          1251 Westwood Blvd.
          Los Angeles, California  90024
          Telecopier:  (310) 477-8611
          Attention:  Matthew P. Wagner

          With a copy to:

          Sullivan & Cromwell
          444 South Flower Street
          Los Angeles, California  90071
          Telecopier:  (213) 683-0458
          Attention:  Stanley F. Farrar, Esq.


                                         -4-

<PAGE>

     If to the Shareholder:





          10. MISCELLANEOUS.

          a. SEVERABILITY.  If any provision of this Agreement or the
     application of such provision to any person or circumstances shall be held
     invalid or unenforceable by a court of competent jurisdiction, such
     provision or application shall be unenforceable only to the extent of such
     invalidity or unenforceability, and the remainder of the provision held
     invalid or unenforceable and the application of such provision to persons
     or circumstances, other than the party as to which it is held invalid, and
     the remainder of this Agreement, shall not be affected.

          b. CAPACITY.  The covenants contained herein shall apply to
     Shareholder solely in his or her capacity as a shareholder of the Company,
     and no covenant contained herein shall apply to Shareholder in his or her
     capacity as a director or officer of the Company.

          c. COUNTERPARTS.  This Agreement may be executed in one or more
     counterparts, each of which shall be deemed to be an original but all of
     which together shall constitute one and the same instrument.

          d. HEADINGS.  All Section headings herein are for convenience of
     reference only and are not part of this Agreement, and no construction or
     reference shall be derived therefrom.

          e. CHOICE OF LAW.  THIS AGREEMENT SHALL BE DEEMED A CONTRACT MADE
     UNDER, AND FOR ALL PURPOSES SHALL BE CONSTRUED IN ACCORDANCE WITH, THE LAWS
     OF THE STATE OF CALIFORNIA, WITHOUT REFERENCE TO ITS CONFLICTS OF LAW
     PRINCIPLES.

          11. ATTORNEY'S FEES.  The prevailing party or parties in any
litigation, arbitration, mediation, bankruptcy, insolvency or other proceeding
("Proceeding") relating to the enforcement or interpretation of this Agreement
may recover from the unsuccessful party or parties all fees and disbursements of
counsel (including expert witness and other consultants' fees and costs)
relating to or arising out of (a) the Proceeding (whether or not the Proceeding
proceeds to judgment), and (b) any post-judgment or post-award proceeding
including, without limitation, one to enforce or collect any judgment or award
resulting from


                                         -5-

<PAGE>

the Proceeding.  All such judgments and awards shall contain a specific
provision for the recovery of all such subsequently incurred costs, expenses,
and fees and disbursements of counsel.


                                         -6-

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have executed and delivered
this Agreement as of the date first written above.


                                        WESTERN BANCORP
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    

                                        SANTA MONICA
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    


                                         --------------------------------
                                         (Print or type name)


                                          /s/ John R. Newhouse
                                         --------------------------------
                                         (Signature)


                                         -7-



<PAGE>

   
                                                                   EXHIBIT 9.10
    

                                SHAREHOLDER AGREEMENT


          Shareholder Agreement (the "Agreement"), dated as of April 16, 1998,
by and among (i) James V. Reimann, a shareholder (the "Shareholder") of Bank of
Los Angeles, a California banking corporation (the "Company"), (ii) Western
Bancorp, a California corporation ("Western") and (iii) Santa Monica Bank, a
California banking corporation ("Santa Monica").  All terms used herein and not
defined herein shall have the meanings assigned thereto in the Merger Agreement
(defined below).

          Whereas, Western, Santa Monica and the Company have entered into an
Agreement and Plan of Merger, dated the date hereof (the "Merger Agreement"),
providing for the business combination transaction contemplated therein in which
the Company will merge with and into Santa Monica pursuant to the terms and
conditions of the Merger Agreement (the "Merger") and Western will pay
consideration to the Company's shareholders in the form of Western Common Stock;

          Whereas, the Shareholder owns the shares of Company Common Stock
identified on ANNEX I hereto (such shares, together with all shares of Company
Common Stock subsequently acquired by the Shareholder during the term of this
Agreement, being referred to as the "Shares"); and

          Whereas, in order to induce Western and Santa Monica to enter into the
Merger Agreement and in consideration of the substantial expenses incurred and
to be incurred by Western and Santa Monica in connection therewith, the
Shareholder, solely in such Shareholder's capacity as a shareholder of the
Company, has agreed to enter into and perform this Agreement.

          Now, therefore, for good and valuable consideration, the receipt,
sufficiency and adequacy of which are hereby acknowledged, the parties hereto
agree as follows:

          1. AGREEMENT TO VOTE SHARES.  Shareholder shall vote or cause to be
voted, or execute a written consent with respect to, the Shares (a) in favor of
adoption and approval of the Merger Agreement and the Merger and all
transactions relating thereto at every meeting of the shareholders of the
Company at which such matters are considered and at every adjournment thereof
and in connection with every proposal to take action by written consent with
respect thereto, and (b) against any other Acquisition Proposal at every meeting
of the shareholders of the Company at which such matters are considered and at
every adjournment thereof and in connection with every proposal to take action
by written consent with respect thereto.

<PAGE>

          2. NO VOTING TRUSTS.  Shareholder agrees that Shareholder will not,
nor will Shareholder permit any entity under Shareholder's control to, deposit
any Shares in a voting trust or subject the Shares to any agreement, arrangement
or understanding with respect to the voting of the Shares inconsistent with this
Agreement.

          3. LIMITATION ON SALES.  Except to a donee who agrees in writing to be
bound by the provisions of Section 1 hereof, during the term of this Agreement,
Shareholder agrees not to sell, assign, transfer or dispose of any of the
Shares.

          4. REPRESENTATIONS AND WARRANTIES OF SHAREHOLDER.  Shareholder
represents and warrants to and agrees with Western and Santa Monica as follows:

          a. CAPACITY.  Shareholder has all requisite capacity and authority to
     enter into and perform his or her obligations under this Agreement.

          b. BINDING AGREEMENT.  This Agreement constitutes the valid and
     legally binding obligation of Shareholder, subject to bankruptcy,
     insolvency, fraudulent transfer, reorganization, moratorium and similar
     laws of general applicability relating to or affecting creditors' rights
     and to general equity principles.

          c. NON-CONTRAVENTION.  The execution and delivery of this Agreement by
     Shareholder does not, and the performance by Shareholder of his or her
     obligations hereunder and the consummation by Shareholder of the
     transactions contemplated hereby will not, violate or conflict with, or
     constitute a default under, any agreement, instrument, contract or other
     obligation or any order, arbitration award, judgment or decree to which
     Shareholder is a party or by which Shareholder is bound, or any statute,
     rule or regulation to which Shareholder is subject or, in the event that
     Shareholder is a corporation, partnership, trust or other entity, any
     charter, bylaw or other organizational document of the Shareholder.

          d. OWNERSHIP OF SHARES.  Shareholder has good title to all of the
     Shares as of the date hereof, and, except as set forth on Annex A hereto,
     the Shares are so owned free and clear of any liens, security interests,
     charges or other encumbrances.

          5. DISCLOSURE; SOLICITATION.  Neither Shareholder nor any corporation,
partnership, trust or other entity controlled by Shareholder shall:

          a. at any time following the Effective Date, disclose confidential
     information regarding the Company to any third parties, except as required
     by law, regulation, a court order, in the defense of litigation for which
     the Company may be liable, or in any actions relating to this Agreement or
     the Merger Agreement and the transactions contemplated hereby or thereby;
     and


                                         -2-

<PAGE>

          b. for a period of two years following the Effective Date, solicit,
     directly or indirectly, on its own behalf or on behalf of any other person
     or entity, management personnel employed by Western or Santa Monica
     immediately after the Effective Time for employment with any other
     business;

PROVIDED, HOWEVER, that with respect to any of the matters covered in this
Section 5, to the extent that any restriction set forth in this Section 5 is
adjudicated to be invalid or unenforceable in any jurisdiction, the court making
such determination shall have the power to limit, construe or reduce the
duration, scope, activity or area of such provision to the extent necessary to
render such provision enforceable to the maximum extent permitted by applicable
law, such limited form to apply only with respect to the operation of such
provision in the particular jurisdiction in which such adjudication is made.

          6. SPECIFIC PERFORMANCE AND REMEDIES.  Shareholder acknowledges that
it will be impossible to measure in money the damage to Western or to Santa
Monica if Shareholder fails to comply with the obligations imposed by this
Agreement and that, in the event of any such failure, Western and Santa Monica
will not have an adequate remedy at law or in damages.  Accordingly, Shareholder
agrees that injunctive relief or other equitable remedy, in addition to remedies
at law or in damages, is the appropriate remedy for any such failure and will
not oppose the granting of such relief on the basis that Western or Santa Monica
have an adequate remedy at law.  Shareholder agrees that it will not seek, and
agrees to waive any requirement for, the securing or posting of a bond in
connection with Western or Santa Monica's seeking or obtaining such equitable
relief.  In addition to all other rights or remedies which Western or Santa
Monica may have against Shareholder in the event of a default in Shareholder's
performance of Shareholder's obligations under this Agreement, Shareholder shall
be liable to Western and Santa Monica for all litigation costs and attorneys'
fees incurred by Western and Santa Monica in connection with the enforcement of
any of its rights or remedies against Shareholder.  In addition, after
discussing the matter with Shareholder, Western and Santa Monica shall have the
right to inform any third party that Western and Santa Monica reasonably
believes to be, or to be contemplating, participating with Shareholder or
receiving from Shareholder assistance in violation of this Agreement, of the
terms of this Agreement and of the rights of Western and Santa Monica hereunder,
and that participation by any such persons with Shareholder in activities in
violation of Shareholder's agreement with Western and Santa Monica set forth in
this Agreement may give rise to claims by Western and Santa Monica against such
third party.

          7. TERM OF AGREEMENT; TERMINATION.  a.  The term of this Agreement
shall commence on the date hereof.

          b. This Agreement shall terminate upon the date, if any, of the
termination of the Merger Agreement prior to the Effective Time in accordance
with its terms.  Upon such termination, no party shall have any further
obligations or liabilities hereunder; PROVIDED, HOWEVER, such termination shall
not relieve any party from liability for any breach


                                         -3-

<PAGE>

of this Agreement PRIOR to such termination.  If this Agreement is terminated
pursuant to Section 8.01 of the Merger Agreement, so long as the Company honors
its applicable obligations under Section 8.03 of the Merger Agreement, no party
shall have any further obligations or liabilities under this Agreement.

          c.  If the Merger Agreement is not terminated prior to the Effective
Time, this Agreement (except for the provisions of Sections 4, 5(b), 6, 9 and
10, which shall survive the Effective Time), shall terminate upon the Effective
Time.  Sections 4, 5, 6, 9 and 10 shall terminate on the date two years after
the Effective Time.

          8. ENTIRE AGREEMENT.  This Agreement supersedes all prior agreements,
written or oral, among the parties hereto with respect to the subject matter
hereof and contains the entire agreement among the parties with respect to the
subject matter hereof.  This Agreement may not be amended, supplemented or
modified, and no provisions hereof may be modified or waived, except by an
instrument in writing signed by each party hereto.  No waiver of any provisions
hereof by either party shall be deemed a waiver of any other provisions hereof
by any such party, nor shall any such waiver be deemed a continuing waiver of
any provision hereof by such party.

          9. NOTICES.  All notices, requests, claims, demands or other
communications hereunder shall be in writing and shall be deemed given when
delivered personally, upon receipt of a transmission confirmation if sent by
telecopy or like transmission and on the next business day when sent by a
reputable overnight courier service to the parties at the following addresses
(or at such other address for a party as shall be specified by like notice):

          If to Western or Santa Monica:

          Western Bancorp
          1251 Westwood Blvd.
          Los Angeles, California  90024
          Telecopier:  (310) 477-8611
          Attention:  Matthew P. Wagner

          With a copy to:

          Sullivan & Cromwell
          444 South Flower Street
          Los Angeles, California  90071
          Telecopier:  (213) 683-0458
          Attention:  Stanley F. Farrar, Esq.


                                         -4-

<PAGE>

     If to the Shareholder:





          10. MISCELLANEOUS.

          a. SEVERABILITY.  If any provision of this Agreement or the
     application of such provision to any person or circumstances shall be held
     invalid or unenforceable by a court of competent jurisdiction, such
     provision or application shall be unenforceable only to the extent of such
     invalidity or unenforceability, and the remainder of the provision held
     invalid or unenforceable and the application of such provision to persons
     or circumstances, other than the party as to which it is held invalid, and
     the remainder of this Agreement, shall not be affected.

          b. CAPACITY.  The covenants contained herein shall apply to
     Shareholder solely in his or her capacity as a shareholder of the Company,
     and no covenant contained herein shall apply to Shareholder in his or her
     capacity as a director or officer of the Company.

          c. COUNTERPARTS.  This Agreement may be executed in one or more
     counterparts, each of which shall be deemed to be an original but all of
     which together shall constitute one and the same instrument.

          d. HEADINGS.  All Section headings herein are for convenience of
     reference only and are not part of this Agreement, and no construction or
     reference shall be derived therefrom.

          e. CHOICE OF LAW.  THIS AGREEMENT SHALL BE DEEMED A CONTRACT MADE
     UNDER, AND FOR ALL PURPOSES SHALL BE CONSTRUED IN ACCORDANCE WITH, THE LAWS
     OF THE STATE OF CALIFORNIA, WITHOUT REFERENCE TO ITS CONFLICTS OF LAW
     PRINCIPLES.

          11. ATTORNEY'S FEES.  The prevailing party or parties in any
litigation, arbitration, mediation, bankruptcy, insolvency or other proceeding
("Proceeding") relating to the enforcement or interpretation of this Agreement
may recover from the unsuccessful party or parties all fees and disbursements of
counsel (including expert witness and other consultants' fees and costs)
relating to or arising out of (a) the Proceeding (whether or not the Proceeding
proceeds to judgment), and (b) any post-judgment or post-award proceeding
including, without limitation, one to enforce or collect any judgment or award
resulting from


                                         -5-

<PAGE>

the Proceeding.  All such judgments and awards shall contain a specific
provision for the recovery of all such subsequently incurred costs, expenses,
and fees and disbursements of counsel.


                                         -6-

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have executed and delivered
this Agreement as of the date first written above.


                                        WESTERN BANCORP
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    

                                        SANTA MONICA
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    

                                          James V. Reimann
                                         --------------------------------
                                         (Print or type name)


                                          /s/ James V. Reimann
                                         --------------------------------
                                         (Signature)


                                         -7-



<PAGE>

   
                                                                   EXHIBIT 9.11
    

                                SHAREHOLDER AGREEMENT


          Shareholder Agreement (the "Agreement"), dated as of April 16, 1998,
by and among (i) Mel F. Shaw, a shareholder (the "Shareholder") of Bank of
Los Angeles, a California banking corporation (the "Company"), (ii) Western
Bancorp, a California corporation ("Western") and (iii) Santa Monica Bank, a
California banking corporation ("Santa Monica").  All terms used herein and not
defined herein shall have the meanings assigned thereto in the Merger Agreement
(defined below).

          Whereas, Western, Santa Monica and the Company have entered into an
Agreement and Plan of Merger, dated the date hereof (the "Merger Agreement"),
providing for the business combination transaction contemplated therein in which
the Company will merge with and into Santa Monica pursuant to the terms and
conditions of the Merger Agreement (the "Merger") and Western will pay
consideration to the Company's shareholders in the form of Western Common Stock;

          Whereas, the Shareholder owns the shares of Company Common Stock
identified on ANNEX I hereto (such shares, together with all shares of Company
Common Stock subsequently acquired by the Shareholder during the term of this
Agreement, being referred to as the "Shares"); and

          Whereas, in order to induce Western and Santa Monica to enter into the
Merger Agreement and in consideration of the substantial expenses incurred and
to be incurred by Western and Santa Monica in connection therewith, the
Shareholder, solely in such Shareholder's capacity as a shareholder of the
Company, has agreed to enter into and perform this Agreement.

          Now, therefore, for good and valuable consideration, the receipt,
sufficiency and adequacy of which are hereby acknowledged, the parties hereto
agree as follows:

          1. AGREEMENT TO VOTE SHARES.  Shareholder shall vote or cause to be
voted, or execute a written consent with respect to, the Shares (a) in favor of
adoption and approval of the Merger Agreement and the Merger and all
transactions relating thereto at every meeting of the shareholders of the
Company at which such matters are considered and at every adjournment thereof
and in connection with every proposal to take action by written consent with
respect thereto, and (b) against any other Acquisition Proposal at every meeting
of the shareholders of the Company at which such matters are considered and at
every adjournment thereof and in connection with every proposal to take action
by written consent with respect thereto.

<PAGE>

          2. NO VOTING TRUSTS.  Shareholder agrees that Shareholder will not,
nor will Shareholder permit any entity under Shareholder's control to, deposit
any Shares in a voting trust or subject the Shares to any agreement, arrangement
or understanding with respect to the voting of the Shares inconsistent with this
Agreement.

          3. LIMITATION ON SALES.  Except to a donee who agrees in writing to be
bound by the provisions of Section 1 hereof, during the term of this Agreement,
Shareholder agrees not to sell, assign, transfer or dispose of any of the
Shares.

          4. REPRESENTATIONS AND WARRANTIES OF SHAREHOLDER.  Shareholder
represents and warrants to and agrees with Western and Santa Monica as follows:

          a. CAPACITY.  Shareholder has all requisite capacity and authority to
     enter into and perform his or her obligations under this Agreement.

          b. BINDING AGREEMENT.  This Agreement constitutes the valid and
     legally binding obligation of Shareholder, subject to bankruptcy,
     insolvency, fraudulent transfer, reorganization, moratorium and similar
     laws of general applicability relating to or affecting creditors' rights
     and to general equity principles.

          c. NON-CONTRAVENTION.  The execution and delivery of this Agreement by
     Shareholder does not, and the performance by Shareholder of his or her
     obligations hereunder and the consummation by Shareholder of the
     transactions contemplated hereby will not, violate or conflict with, or
     constitute a default under, any agreement, instrument, contract or other
     obligation or any order, arbitration award, judgment or decree to which
     Shareholder is a party or by which Shareholder is bound, or any statute,
     rule or regulation to which Shareholder is subject or, in the event that
     Shareholder is a corporation, partnership, trust or other entity, any
     charter, bylaw or other organizational document of the Shareholder.

          d. OWNERSHIP OF SHARES.  Shareholder has good title to all of the
     Shares as of the date hereof, and, except as set forth on Annex A hereto,
     the Shares are so owned free and clear of any liens, security interests,
     charges or other encumbrances.

          5. DISCLOSURE; SOLICITATION.  Neither Shareholder nor any corporation,
partnership, trust or other entity controlled by Shareholder shall:

          a. at any time following the Effective Date, disclose confidential
     information regarding the Company to any third parties, except as required
     by law, regulation, a court order, in the defense of litigation for which
     the Company may be liable, or in any actions relating to this Agreement or
     the Merger Agreement and the transactions contemplated hereby or thereby;
     and


                                         -2-

<PAGE>

          b. for a period of two years following the Effective Date, solicit,
     directly or indirectly, on its own behalf or on behalf of any other person
     or entity, management personnel employed by Western or Santa Monica
     immediately after the Effective Time for employment with any other
     business;

PROVIDED, HOWEVER, that with respect to any of the matters covered in this
Section 5, to the extent that any restriction set forth in this Section 5 is
adjudicated to be invalid or unenforceable in any jurisdiction, the court making
such determination shall have the power to limit, construe or reduce the
duration, scope, activity or area of such provision to the extent necessary to
render such provision enforceable to the maximum extent permitted by applicable
law, such limited form to apply only with respect to the operation of such
provision in the particular jurisdiction in which such adjudication is made.

          6. SPECIFIC PERFORMANCE AND REMEDIES.  Shareholder acknowledges that
it will be impossible to measure in money the damage to Western or to Santa
Monica if Shareholder fails to comply with the obligations imposed by this
Agreement and that, in the event of any such failure, Western and Santa Monica
will not have an adequate remedy at law or in damages.  Accordingly, Shareholder
agrees that injunctive relief or other equitable remedy, in addition to remedies
at law or in damages, is the appropriate remedy for any such failure and will
not oppose the granting of such relief on the basis that Western or Santa Monica
have an adequate remedy at law.  Shareholder agrees that it will not seek, and
agrees to waive any requirement for, the securing or posting of a bond in
connection with Western or Santa Monica's seeking or obtaining such equitable
relief.  In addition to all other rights or remedies which Western or Santa
Monica may have against Shareholder in the event of a default in Shareholder's
performance of Shareholder's obligations under this Agreement, Shareholder shall
be liable to Western and Santa Monica for all litigation costs and attorneys'
fees incurred by Western and Santa Monica in connection with the enforcement of
any of its rights or remedies against Shareholder.  In addition, after
discussing the matter with Shareholder, Western and Santa Monica shall have the
right to inform any third party that Western and Santa Monica reasonably
believes to be, or to be contemplating, participating with Shareholder or
receiving from Shareholder assistance in violation of this Agreement, of the
terms of this Agreement and of the rights of Western and Santa Monica hereunder,
and that participation by any such persons with Shareholder in activities in
violation of Shareholder's agreement with Western and Santa Monica set forth in
this Agreement may give rise to claims by Western and Santa Monica against such
third party.

          7. TERM OF AGREEMENT; TERMINATION.  a.  The term of this Agreement
shall commence on the date hereof.

          b. This Agreement shall terminate upon the date, if any, of the
termination of the Merger Agreement prior to the Effective Time in accordance
with its terms.  Upon such termination, no party shall have any further
obligations or liabilities hereunder; PROVIDED, HOWEVER, such termination shall
not relieve any party from liability for any breach


                                         -3-

<PAGE>

of this Agreement PRIOR to such termination.  If this Agreement is terminated
pursuant to Section 8.01 of the Merger Agreement, so long as the Company honors
its applicable obligations under Section 8.03 of the Merger Agreement, no party
shall have any further obligations or liabilities under this Agreement.

          c.  If the Merger Agreement is not terminated prior to the Effective
Time, this Agreement (except for the provisions of Sections 4, 5(b), 6, 9 and
10, which shall survive the Effective Time), shall terminate upon the Effective
Time.  Sections 4, 5, 6, 9 and 10 shall terminate on the date two years after
the Effective Time.

          8. ENTIRE AGREEMENT.  This Agreement supersedes all prior agreements,
written or oral, among the parties hereto with respect to the subject matter
hereof and contains the entire agreement among the parties with respect to the
subject matter hereof.  This Agreement may not be amended, supplemented or
modified, and no provisions hereof may be modified or waived, except by an
instrument in writing signed by each party hereto.  No waiver of any provisions
hereof by either party shall be deemed a waiver of any other provisions hereof
by any such party, nor shall any such waiver be deemed a continuing waiver of
any provision hereof by such party.

          9. NOTICES.  All notices, requests, claims, demands or other
communications hereunder shall be in writing and shall be deemed given when
delivered personally, upon receipt of a transmission confirmation if sent by
telecopy or like transmission and on the next business day when sent by a
reputable overnight courier service to the parties at the following addresses
(or at such other address for a party as shall be specified by like notice):

          If to Western or Santa Monica:

          Western Bancorp
          1251 Westwood Blvd.
          Los Angeles, California  90024
          Telecopier:  (310) 477-8611
          Attention:  Matthew P. Wagner

          With a copy to:

          Sullivan & Cromwell
          444 South Flower Street
          Los Angeles, California  90071
          Telecopier:  (213) 683-0458
          Attention:  Stanley F. Farrar, Esq.


                                         -4-

<PAGE>

     If to the Shareholder:





          10. MISCELLANEOUS.

          a. SEVERABILITY.  If any provision of this Agreement or the
     application of such provision to any person or circumstances shall be held
     invalid or unenforceable by a court of competent jurisdiction, such
     provision or application shall be unenforceable only to the extent of such
     invalidity or unenforceability, and the remainder of the provision held
     invalid or unenforceable and the application of such provision to persons
     or circumstances, other than the party as to which it is held invalid, and
     the remainder of this Agreement, shall not be affected.

          b. CAPACITY.  The covenants contained herein shall apply to
     Shareholder solely in his or her capacity as a shareholder of the Company,
     and no covenant contained herein shall apply to Shareholder in his or her
     capacity as a director or officer of the Company.

          c. COUNTERPARTS.  This Agreement may be executed in one or more
     counterparts, each of which shall be deemed to be an original but all of
     which together shall constitute one and the same instrument.

          d. HEADINGS.  All Section headings herein are for convenience of
     reference only and are not part of this Agreement, and no construction or
     reference shall be derived therefrom.

          e. CHOICE OF LAW.  THIS AGREEMENT SHALL BE DEEMED A CONTRACT MADE
     UNDER, AND FOR ALL PURPOSES SHALL BE CONSTRUED IN ACCORDANCE WITH, THE LAWS
     OF THE STATE OF CALIFORNIA, WITHOUT REFERENCE TO ITS CONFLICTS OF LAW
     PRINCIPLES.

          11. ATTORNEY'S FEES.  The prevailing party or parties in any
litigation, arbitration, mediation, bankruptcy, insolvency or other proceeding
("Proceeding") relating to the enforcement or interpretation of this Agreement
may recover from the unsuccessful party or parties all fees and disbursements of
counsel (including expert witness and other consultants' fees and costs)
relating to or arising out of (a) the Proceeding (whether or not the Proceeding
proceeds to judgment), and (b) any post-judgment or post-award proceeding
including, without limitation, one to enforce or collect any judgment or award
resulting from


                                         -5-

<PAGE>

the Proceeding.  All such judgments and awards shall contain a specific
provision for the recovery of all such subsequently incurred costs, expenses,
and fees and disbursements of counsel.


                                         -6-

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have executed and delivered
this Agreement as of the date first written above.


                                        WESTERN BANCORP
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    

                                        SANTA MONICA
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    

                                          Mel F. Shaw
                                         --------------------------------
                                         (Print or type name)


                                          /s/ Mel F. Shaw
                                         --------------------------------
                                         (Signature)


                                         -7-



<PAGE>

   
                                                                   EXHIBIT 9.12
    

                                SHAREHOLDER AGREEMENT


          Shareholder Agreement (the "Agreement"), dated as of April 16, 1998,
by and among (i) Burton N. Sterman, a shareholder (the "Shareholder") of Bank of
Los Angeles, a California banking corporation (the "Company"), (ii) Western
Bancorp, a California corporation ("Western") and (iii) Santa Monica Bank, a
California banking corporation ("Santa Monica").  All terms used herein and not
defined herein shall have the meanings assigned thereto in the Merger Agreement
(defined below).

          Whereas, Western, Santa Monica and the Company have entered into an
Agreement and Plan of Merger, dated the date hereof (the "Merger Agreement"),
providing for the business combination transaction contemplated therein in which
the Company will merge with and into Santa Monica pursuant to the terms and
conditions of the Merger Agreement (the "Merger") and Western will pay
consideration to the Company's shareholders in the form of Western Common Stock;

          Whereas, the Shareholder owns the shares of Company Common Stock
identified on ANNEX I hereto (such shares, together with all shares of Company
Common Stock subsequently acquired by the Shareholder during the term of this
Agreement, being referred to as the "Shares"); and

          Whereas, in order to induce Western and Santa Monica to enter into the
Merger Agreement and in consideration of the substantial expenses incurred and
to be incurred by Western and Santa Monica in connection therewith, the
Shareholder, solely in such Shareholder's capacity as a shareholder of the
Company, has agreed to enter into and perform this Agreement.

          Now, therefore, for good and valuable consideration, the receipt,
sufficiency and adequacy of which are hereby acknowledged, the parties hereto
agree as follows:

          1. AGREEMENT TO VOTE SHARES.  Shareholder shall vote or cause to be
voted, or execute a written consent with respect to, the Shares (a) in favor of
adoption and approval of the Merger Agreement and the Merger and all
transactions relating thereto at every meeting of the shareholders of the
Company at which such matters are considered and at every adjournment thereof
and in connection with every proposal to take action by written consent with
respect thereto, and (b) against any other Acquisition Proposal at every meeting
of the shareholders of the Company at which such matters are considered and at
every adjournment thereof and in connection with every proposal to take action
by written consent with respect thereto.

<PAGE>

          2. NO VOTING TRUSTS.  Shareholder agrees that Shareholder will not,
nor will Shareholder permit any entity under Shareholder's control to, deposit
any Shares in a voting trust or subject the Shares to any agreement, arrangement
or understanding with respect to the voting of the Shares inconsistent with this
Agreement.

          3. LIMITATION ON SALES.  Except to a donee who agrees in writing to be
bound by the provisions of Section 1 hereof, during the term of this Agreement,
Shareholder agrees not to sell, assign, transfer or dispose of any of the
Shares.

          4. REPRESENTATIONS AND WARRANTIES OF SHAREHOLDER.  Shareholder
represents and warrants to and agrees with Western and Santa Monica as follows:

          a. CAPACITY.  Shareholder has all requisite capacity and authority to
     enter into and perform his or her obligations under this Agreement.

          b. BINDING AGREEMENT.  This Agreement constitutes the valid and
     legally binding obligation of Shareholder, subject to bankruptcy,
     insolvency, fraudulent transfer, reorganization, moratorium and similar
     laws of general applicability relating to or affecting creditors' rights
     and to general equity principles.

          c. NON-CONTRAVENTION.  The execution and delivery of this Agreement by
     Shareholder does not, and the performance by Shareholder of his or her
     obligations hereunder and the consummation by Shareholder of the
     transactions contemplated hereby will not, violate or conflict with, or
     constitute a default under, any agreement, instrument, contract or other
     obligation or any order, arbitration award, judgment or decree to which
     Shareholder is a party or by which Shareholder is bound, or any statute,
     rule or regulation to which Shareholder is subject or, in the event that
     Shareholder is a corporation, partnership, trust or other entity, any
     charter, bylaw or other organizational document of the Shareholder.

          d. OWNERSHIP OF SHARES.  Shareholder has good title to all of the
     Shares as of the date hereof, and, except as set forth on Annex A hereto,
     the Shares are so owned free and clear of any liens, security interests,
     charges or other encumbrances.

          5. DISCLOSURE; SOLICITATION.  Neither Shareholder nor any corporation,
partnership, trust or other entity controlled by Shareholder shall:

          a. at any time following the Effective Date, disclose confidential
     information regarding the Company to any third parties, except as required
     by law, regulation, a court order, in the defense of litigation for which
     the Company may be liable, or in any actions relating to this Agreement or
     the Merger Agreement and the transactions contemplated hereby or thereby;
     and


                                         -2-

<PAGE>

          b. for a period of two years following the Effective Date, solicit,
     directly or indirectly, on its own behalf or on behalf of any other person
     or entity, management personnel employed by Western or Santa Monica
     immediately after the Effective Time for employment with any other
     business;

PROVIDED, HOWEVER, that with respect to any of the matters covered in this
Section 5, to the extent that any restriction set forth in this Section 5 is
adjudicated to be invalid or unenforceable in any jurisdiction, the court making
such determination shall have the power to limit, construe or reduce the
duration, scope, activity or area of such provision to the extent necessary to
render such provision enforceable to the maximum extent permitted by applicable
law, such limited form to apply only with respect to the operation of such
provision in the particular jurisdiction in which such adjudication is made.

          6. SPECIFIC PERFORMANCE AND REMEDIES.  Shareholder acknowledges that
it will be impossible to measure in money the damage to Western or to Santa
Monica if Shareholder fails to comply with the obligations imposed by this
Agreement and that, in the event of any such failure, Western and Santa Monica
will not have an adequate remedy at law or in damages.  Accordingly, Shareholder
agrees that injunctive relief or other equitable remedy, in addition to remedies
at law or in damages, is the appropriate remedy for any such failure and will
not oppose the granting of such relief on the basis that Western or Santa Monica
have an adequate remedy at law.  Shareholder agrees that it will not seek, and
agrees to waive any requirement for, the securing or posting of a bond in
connection with Western or Santa Monica's seeking or obtaining such equitable
relief.  In addition to all other rights or remedies which Western or Santa
Monica may have against Shareholder in the event of a default in Shareholder's
performance of Shareholder's obligations under this Agreement, Shareholder shall
be liable to Western and Santa Monica for all litigation costs and attorneys'
fees incurred by Western and Santa Monica in connection with the enforcement of
any of its rights or remedies against Shareholder.  In addition, after
discussing the matter with Shareholder, Western and Santa Monica shall have the
right to inform any third party that Western and Santa Monica reasonably
believes to be, or to be contemplating, participating with Shareholder or
receiving from Shareholder assistance in violation of this Agreement, of the
terms of this Agreement and of the rights of Western and Santa Monica hereunder,
and that participation by any such persons with Shareholder in activities in
violation of Shareholder's agreement with Western and Santa Monica set forth in
this Agreement may give rise to claims by Western and Santa Monica against such
third party.

          7. TERM OF AGREEMENT; TERMINATION.  a.  The term of this Agreement
shall commence on the date hereof.

          b. This Agreement shall terminate upon the date, if any, of the
termination of the Merger Agreement prior to the Effective Time in accordance
with its terms.  Upon such termination, no party shall have any further
obligations or liabilities hereunder; PROVIDED, HOWEVER, such termination shall
not relieve any party from liability for any breach


                                         -3-

<PAGE>

of this Agreement PRIOR to such termination.  If this Agreement is terminated
pursuant to Section 8.01 of the Merger Agreement, so long as the Company honors
its applicable obligations under Section 8.03 of the Merger Agreement, no party
shall have any further obligations or liabilities under this Agreement.

          c.  If the Merger Agreement is not terminated prior to the Effective
Time, this Agreement (except for the provisions of Sections 4, 5(b), 6, 9 and
10, which shall survive the Effective Time), shall terminate upon the Effective
Time.  Sections 4, 5, 6, 9 and 10 shall terminate on the date two years after
the Effective Time.

          8. ENTIRE AGREEMENT.  This Agreement supersedes all prior agreements,
written or oral, among the parties hereto with respect to the subject matter
hereof and contains the entire agreement among the parties with respect to the
subject matter hereof.  This Agreement may not be amended, supplemented or
modified, and no provisions hereof may be modified or waived, except by an
instrument in writing signed by each party hereto.  No waiver of any provisions
hereof by either party shall be deemed a waiver of any other provisions hereof
by any such party, nor shall any such waiver be deemed a continuing waiver of
any provision hereof by such party.

          9. NOTICES.  All notices, requests, claims, demands or other
communications hereunder shall be in writing and shall be deemed given when
delivered personally, upon receipt of a transmission confirmation if sent by
telecopy or like transmission and on the next business day when sent by a
reputable overnight courier service to the parties at the following addresses
(or at such other address for a party as shall be specified by like notice):

          If to Western or Santa Monica:

          Western Bancorp
          1251 Westwood Blvd.
          Los Angeles, California  90024
          Telecopier:  (310) 477-8611
          Attention:  Matthew P. Wagner

          With a copy to:

          Sullivan & Cromwell
          444 South Flower Street
          Los Angeles, California  90071
          Telecopier:  (213) 683-0458
          Attention:  Stanley F. Farrar, Esq.


                                         -4-

<PAGE>

     If to the Shareholder:





          10. MISCELLANEOUS.

          a. SEVERABILITY.  If any provision of this Agreement or the
     application of such provision to any person or circumstances shall be held
     invalid or unenforceable by a court of competent jurisdiction, such
     provision or application shall be unenforceable only to the extent of such
     invalidity or unenforceability, and the remainder of the provision held
     invalid or unenforceable and the application of such provision to persons
     or circumstances, other than the party as to which it is held invalid, and
     the remainder of this Agreement, shall not be affected.

          b. CAPACITY.  The covenants contained herein shall apply to
     Shareholder solely in his or her capacity as a shareholder of the Company,
     and no covenant contained herein shall apply to Shareholder in his or her
     capacity as a director or officer of the Company.

          c. COUNTERPARTS.  This Agreement may be executed in one or more
     counterparts, each of which shall be deemed to be an original but all of
     which together shall constitute one and the same instrument.

          d. HEADINGS.  All Section headings herein are for convenience of
     reference only and are not part of this Agreement, and no construction or
     reference shall be derived therefrom.

          e. CHOICE OF LAW.  THIS AGREEMENT SHALL BE DEEMED A CONTRACT MADE
     UNDER, AND FOR ALL PURPOSES SHALL BE CONSTRUED IN ACCORDANCE WITH, THE LAWS
     OF THE STATE OF CALIFORNIA, WITHOUT REFERENCE TO ITS CONFLICTS OF LAW
     PRINCIPLES.

          11. ATTORNEY'S FEES.  The prevailing party or parties in any
litigation, arbitration, mediation, bankruptcy, insolvency or other proceeding
("Proceeding") relating to the enforcement or interpretation of this Agreement
may recover from the unsuccessful party or parties all fees and disbursements of
counsel (including expert witness and other consultants' fees and costs)
relating to or arising out of (a) the Proceeding (whether or not the Proceeding
proceeds to judgment), and (b) any post-judgment or post-award proceeding
including, without limitation, one to enforce or collect any judgment or award
resulting from


                                         -5-

<PAGE>

the Proceeding.  All such judgments and awards shall contain a specific
provision for the recovery of all such subsequently incurred costs, expenses,
and fees and disbursements of counsel.


                                         -6-

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have executed and delivered
this Agreement as of the date first written above.


                                        WESTERN BANCORP
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    

                                        SANTA MONICA
   
                                        By: /s/ Arnold C. Hahn
                                           --------------------------------
                                          Name:
                                          Title:
    

                                          Burton N. Sterman
                                         --------------------------------
                                         (Print or type name)


                                          /s/ Burton N. Sterman
                                         --------------------------------
                                         (Signature)


                                         -7-



<PAGE>


                                                                    EXHIBIT 10.1


                         AGREEMENT AND PLAN OF MERGER
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                         dated as of July 24th, 1998

                                 by and among

                               Western Bancorp,

                              Portola Merger Sub

                                      and

                         Peninsula Bank of San Diego


- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

<PAGE>

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                           PAGE
                                                                           ----
<S>                                                                        <C>
RECITALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1


                          ARTICLE I Certain Definitions

  1.01  CERTAIN DEFINITIONS. . . . . . . . . . . . . . . . . . . . . . . . . 1


                             ARTICLE II The Merger

  2.01  THE MERGER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
  2.02  EFFECTIVE DATE AND EFFECTIVE TIME. . . . . . . . . . . . . . . . . . 7


                ARTICLE III Consideration; Exchange Procedures

  3.01  MERGER CONSIDERATION . . . . . . . . . . . . . . . . . . . . . . . . 8
  3.02  RIGHTS AS SHAREHOLDERS; STOCK TRANSFERS. . . . . . . . . . . . . . . 9
  3.03  FRACTIONAL SHARES. . . . . . . . . . . . . . . . . . . . . . . . . . 9
  3.04  EXCHANGE PROCEDURES. . . . . . . . . . . . . . . . . . . . . . . . .10
  3.05  ANTI-DILUTION PROVISIONS . . . . . . . . . . . . . . . . . . . . . .11


                    ARTICLE IV Actions Pending Acquisition

  4.01  FORBEARANCES OF PENINSULA. . . . . . . . . . . . . . . . . . . . . .12
  4.02  FORBEARANCES OF WESTERN. . . . . . . . . . . . . . . . . . . . . . .14


                   ARTICLE V Representations and Warranties

  5.01  DISCLOSURE SCHEDULE. . . . . . . . . . . . . . . . . . . . . . . . .15


                                      -i-
<PAGE>

<S>                                                                        <C>
  5.02  STANDARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
  5.03  REPRESENTATIONS AND WARRANTIES OF PENINSULA. . . . . . . . . . . . .15
  5.04  REPRESENTATIONS AND WARRANTIES OF WESTERN. . . . . . . . . . . . . .25

                             ARTICLE VI Covenants

  6.01  REASONABLE BEST EFFORTS. . . . . . . . . . . . . . . . . . . . . . .29
  6.02  SHAREHOLDER APPROVAL . . . . . . . . . . . . . . . . . . . . . . . .29
  6.03  REGISTRATION STATEMENT . . . . . . . . . . . . . . . . . . . . . . .29
  6.04  PRESS RELEASES . . . . . . . . . . . . . . . . . . . . . . . . . . .30
  6.05  ACCESS; INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . .30
  6.06  ACQUISITION PROPOSALS. . . . . . . . . . . . . . . . . . . . . . . .31
  6.07  AFFILIATE AGREEMENTS . . . . . . . . . . . . . . . . . . . . . . . .32
  6.08  BOARD ATTENDANCE . . . . . . . . . . . . . . . . . . . . . . . . . .32
  6.09  CERTAIN POLICIES . . . . . . . . . . . . . . . . . . . . . . . . . .32
  6.10  NASDAQ LISTING . . . . . . . . . . . . . . . . . . . . . . . . . . .32
  6.11  REGULATORY APPLICATIONS. . . . . . . . . . . . . . . . . . . . . . .32
  6.12  INDEMNIFICATION; DIRECTOR AND OFFICERS' INSURANCE. . . . . . . . . .33
  6.13  BENEFIT PLAN . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
  6.14  ACCOUNTANTS' LETTERS . . . . . . . . . . . . . . . . . . . . . . . .35
  6.15  NOTIFICATION OF CERTAIN MATTERS. . . . . . . . . . . . . . . . . . .35
  6.16  SHAREHOLDER AGREEMENTS . . . . . . . . . . . . . . . . . . . . . . .35
  6.17  PENINSULA NAME . . . . . . . . . . . . . . . . . . . . . . . . . . .35
  6.18  EMPLOYEE AGREEMENTS. . . . . . . . . . . . . . . . . . . . . . . . .36


             ARTICLE VII Conditions to Consummation of the Merger

  7.01  CONDITIONS TO EACH PARTY'S OBLIGATION TO EFFECT THE MERGER . . . . .36
  7.02  CONDITIONS TO OBLIGATION OF PENINSULA. . . . . . . . . . . . . . . .37
  7.03  CONDITIONS TO OBLIGATION OF WESTERN. . . . . . . . . . . . . . . . .38


                           ARTICLE VIII Termination

  8.01  TERMINATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
  8.02  EFFECT OF TERMINATION AND ABANDONMENT. . . . . . . . . . . . . . . .41


                                     -ii-
<PAGE>

<S>                                                                        <C>
  8.03  TERMINATION FEE. . . . . . . . . . . . . . . . . . . . . . . . . . .41


                          ARTICLE IX Miscellaneous

  9.01  SURVIVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
  9.02  WAIVER; AMENDMENT. . . . . . . . . . . . . . . . . . . . . . . . . .42
  9.03  COUNTERPARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
  9.04  GOVERNING LAW; WAIVER OF JURY TRIAL. . . . . . . . . . . . . . . . .42
  9.05  EXPENSES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
  9.06  NOTICES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
  9.07  ENTIRE UNDERSTANDING; NO THIRD PARTY BENEFICIARIES . . . . . . . . .43
  9.08  INTERPRETATION; EFFECT . . . . . . . . . . . . . . . . . . . . . . .44


                                    -iii-
<PAGE>

                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
EXHIBIT A      Form of Affiliate Agreement
EXHIBIT B      Form of Directors' Shareholder Agreement
EXHIBIT C      Form of Officers' Shareholder Agreement
</TABLE>


                                      -iv-
<PAGE>

          AGREEMENT AND PLAN OF MERGER, dated as of July 24, 1998 (this
"AGREEMENT"), by and among Peninsula Bank of San Diego ("PENINSULA"), Western
Bancorp ("WESTERN") and Portola Merger Sub ("Merger Sub").

                                    RECITALS

          A.        PENINSULA BANK OF SAN DIEGO.  Peninsula is a California
corporation, having its principal place of business in San Diego, California.

          B.        WESTERN BANCORP.  Western is a California corporation,
having its principal place of business in Newport Beach, California.

          C.        PORTOLA MERGER SUB.  Merger Sub is a California corporation
and a wholly owned subsidiary of Western.

          D.        STOCK OPTION AGREEMENT.  Concurrently herewith, Peninsula
and Western are entering into a stock option agreement (the "STOCK OPTION
AGREEMENT"), to be dated the date hereof, whereby Peninsula will grant to
Western the option to purchase up to 19.9% of the outstanding shares of the
Peninsula Common Stock upon the occurrence of certain events.  

          E.        INTENTIONS OF THE PARTIES.  It is the intention of the
parties to this Agreement that the business combination contemplated hereby be
accounted for under the "pooling-of-interests" accounting method and be treated
as a "reorganization" under Section 368 of the Internal Revenue Code of 1986 as
amended (the "CODE").

          F.        BOARD ACTION.  The respective Boards of Directors of each of
Western and Peninsula have determined that it is in the best interests of their
respective companies and their shareholders to consummate the strategic business
combination transaction provided for herein.  

          NOW, THEREFORE, in consideration of the premises and of the mutual
covenants, representations, warranties and agreements contained herein, the
parties agree as follows:

                                      ARTICLE I

                                 CERTAIN DEFINITIONS

          1.01  CERTAIN DEFINITIONS.  The following terms are used in this
Agreement with the meanings set forth below:

<PAGE>

          "ACQUISITION PROPOSAL" means any tender or exchange offer, proposal
     for a merger, consolidation or other business combination involving
     Peninsula or any of its Subsidiaries or any proposal or offer to acquire in
     any manner a substantial equity interest in, or a substantial portion of
     the assets or deposits of, Peninsula or any of its Subsidiaries, other than
     the transactions contemplated by this Agreement.

          "AGREEMENT" means this Agreement, as amended or modified from time to
     time in accordance with Section 9.02.

          "AVERAGE PRICE" has the meaning set forth in Section 3.01(a).

          "BENEFIT PLANS" has the meaning set forth in Section 5.03(m).

          "BUSINESS COMBINATION" has the meaning set forth in Section 3.05.

          "BKX INDEX PERCENTAGE" has the meaning set forth in Section 8.01(f).

          "CGCL" means the California General Corporation law.

          "CALIFORNIA SECRETARY" means the California Secretary of State.

          "CODE" has the meaning set forth in the recitals.

          "COMMISSIONER" means the California Commissioner of Financial
     Institutions.

          "COMPUTER SYSTEM" has the meaning set forth in Section 5.03(o).

          "COSTS" has the meaning set forth in Section 6.12(a).

          "DAILY TRADES" has the meaning set forth in Section 3.01(a).

          "DETERMINATION PERIOD" has the meaning set forth in Section 3.01(a).

          "DISCLOSURE SCHEDULE" has the meaning set forth in Section 5.01.

          "DISSENTERS' SHARES" means shares of Peninsula Common Stock with
     respect to which the holder or holders thereof perfect their rights to
     dissent under Chapter 13 of the CGCL. 

          "DISSENTING SHAREHOLDERS" means holders of shares of Peninsula Common
     Stock who perfect their rights to dissent under Chapter 13 of the CGCL. 


                                       2
<PAGE>

          "EFFECTIVE DATE" means the date on which the Effective Time occurs.

          "EFFECTIVE TIME" means the effective time of the Merger, as provided
     for in Section 2.02.

          "EMPLOYEES" has the meaning set forth in Section 5.03(m).  

          "ENVIRONMENTAL LAW" has the meaning set forth in Section 5.03(p).

          "ERISA" means the Employee Retirement Income Security Act of 1974, as
     amended.

          "ERISA AFFILIATE" has the meaning set forth in Section 5.03(m).

          "EXCHANGE ACT" means the Securities Exchange Act of 1934, as amended,
     and the rules and regulations thereunder.

          "EXCHANGE AGENT" has the meaning set forth in Section 3.04.

          "EXCHANGE FUND" has the meaning set forth in Section 3.04.

          "EXCHANGE RATIO" has the meaning set forth in Section 3.01.

          "EXECUTIVES" has the meaning set forth in Section 6.18.

          "FDIC" means the Federal Deposit Insurance Corporation.

          "FEDERAL RESERVE" means the Board of Governors of the Federal Reserve
     System.

          "GAAP" has the meaning set forth in Section 5.03(g).

          "GOVERNMENTAL AUTHORITY" means any court, administrative agency or
     commission or other federal, state or local governmental authority or
     instrumentality.

          "HAZARDOUS SUBSTANCE" has the meaning set forth in Section 5.03(p).

          "INDEMNIFIED PARTIES" has the meaning set forth in Section 6.12(a).

          "INSURANCE POLICIES" has the meaning set forth in Section 5.03(t).

          "LIENS" means any charge, mortgage, pledge, security interest,
     restriction, claim, lien or encumbrance.


                                      -3-
<PAGE>

          "LOAN PROPERTY" has the meaning set forth in Section 5.03(p).

          "MATERIAL ADVERSE EFFECT" means, with respect to Western or Peninsula,
     any effect that (i) is material and adverse to the financial position,
     results of operations or business of Western and its Subsidiaries taken as
     a whole or Peninsula and its Subsidiaries taken as a whole, respectively,
     or (ii) would materially impair the ability of either Western or Peninsula
     to perform its obligations under this Agreement or otherwise materially
     threaten or materially impede the consummation of the Merger and the other
     transactions contemplated by this Agreement; PROVIDED, HOWEVER, that
     Material Adverse Effect shall not be deemed to include the impact of (a)
     changes in banking and similar laws of general applicability or
     interpretations thereof by courts or governmental authorities, (b) changes
     in generally accepted accounting principles or regulatory accounting
     requirements applicable to banks and their holding companies generally and
     (c) any modifications or changes to valuation policies and practices in
     connection with the Merger or restructuring charges taken in connection
     with the Merger, in each case in accordance with generally accepted
     accounting principles.


          "MAXIMUM AMOUNT" has the meaning set forth in Section 6.12(c).

          "MERGER" has the meaning set forth in Section 2.01.

          "MERGER CONSIDERATION" has the meaning set forth in Section 2.01.

          "MERGER SUB" has the meaning set forth in the preamble to this
          Agreement.

          "MERGER SUB COMMON STOCK" means the common stock, par value $.01 per
     share, of  Merger Sub.

          "MULTIEMPLOYER PLANS" has the meaning set forth in Section 5.03(m).

          "NASDAQ" means The Nasdaq Stock Market, Inc.'s National Market.

          "NEW CERTIFICATES" has the meaning set forth in Section 3.04.

          "OLD CERTIFICATES" has the meaning set forth in Section 3.04.

          "PENINSULA" has the meaning set forth in the preamble to this
     Agreement.

          "PENINSULA AFFILIATE" has the meaning set forth in Section 6.07(a).

          "PENINSULA ARTICLES" means the Articles of Incorporation of Peninsula.


                                      -4-
<PAGE>

          "PENINSULA BOARD" means the Board of Directors of Peninsula.

          "PENINSULA BY-LAWS" means the By-laws of Peninsula.

          "PENINSULA COMMON STOCK" means the common stock, no par value per
     share, of Peninsula.

          "PENINSULA MEETING" has the meaning set forth in Section 6.02.

          "PENINSULA STOCK DIVIDEND" means the Previously Disclosed 5% dividend
     on Peninsula Common Stock, declared by the Peninsula Board on June 23rd,
     1998, payable on or about July 24, 1998. 

          "PENSION PLAN" has the meaning set forth in Section 5.03(m).

          "PERSON" means any individual, bank, corporation, partnership,
     association, joint-stock company, business trust or unincorporated
     organization.

          "PLANS" has the meaning set forth in Section 5.03(m).

          "PREVIOUSLY DISCLOSED" by a party shall mean information set forth in
     its Disclosure Schedule.

          "PROXY STATEMENT" has the meaning set forth in Section 6.03.

          "REGISTRATION STATEMENT" has the meaning set forth in Section 6.03.

          "REGULATORY AGENCIES" has the meaning set forth in Section 5.03(g).

          "REGULATORY APPROVAL DATE" means the date which is the later to occur
     of approval by (i) the FDIC pursuant to the Bank Merger Act, and (ii) the
     Commissioner pursuant to Section 700 ET. SEQ. of the California Financial
     Code.  

          "REGULATORY AUTHORITY" has the meaning set forth in Section
     5.03(g)(2).

          "REGULATORY DOCUMENTS" means documents filed with the SEC of the types
     referred to in Section 5.04(g).

          "REPRESENTATIVES" means, with respect to any Person, such Person's
     directors, officers, employees, legal or financial advisors or any
     representatives of such legal or financial advisors.


                                      -5-
<PAGE>

          "RIGHTS" means, with respect to any Person, securities or obligations
     convertible into or exercisable or exchangeable for, or giving any person
     any right to subscribe for or acquire, or any options, calls or commitments
     relating to, or any stock appreciation right or other instrument the value
     of which is determined in whole or in part by reference to the market price
     or value of, shares of capital stock of such Person.

          "SEC" means the Securities and Exchange Commission.

          "SECURITIES ACT" means the Securities Act of 1933, as amended, and
     rules and regulations thereunder.

          "SHAREHOLDER AGREEMENTS" has the meaning set forth in Section 6.16.

          "STOCK OPTION AGREEMENT" has the meaning set forth in the Recitals.

          "SUBSIDIARY" and "SIGNIFICANT SUBSIDIARY" have the meanings ascribed
     to them in Rule 1-02 of Regulation S-X of the SEC.

          "SURVIVING CORPORATION" has the meaning set forth in Section 2.01.

          "TAX" AND "TAXES" means all federal, state, local or foreign taxes,
     charges, fees, levies or other assessments, however denominated, including,
     without limitation, all net income, gross income, gains, gross receipts,
     sales, use, ad valorem, goods and services, capital, production, transfer,
     franchise, windfall profits, license, withholding, payroll, employment,
     disability, employer health, excise, estimated, severance, stamp,
     occupation, property, environmental, unemployment or other taxes, custom
     duties, fees, assessments or charges of any kind whatsoever, together with
     any interest and any penalties, additions to tax or additional amounts
     imposed by any taxing authority whether arising before, on or after the
     Effective Date.

          "TAX RETURNS" means any return, amended return or other report
     (including elections, declarations, disclosures, schedules, estimates and
     information returns) required to be filed with respect to any Tax.

          "TEN DAY AVERAGE KEEFE BANK INDEX" has the meaning set forth in
     Section 8.01(f).

          "TEN DAY AVERAGE PRICE" has the meaning set forth in Section 8.01(f).

          "TEN DAY PERIOD" has the meaning set forth in Section 8.01(f).

          "TRADING DAY" has the meaning set forth in Section 3.01(a).


                                      -6-
<PAGE>

          "TREASURY STOCK" shall mean shares of Peninsula Common Stock held by
     Peninsula or any of its Subsidiaries or by Western or any of its
     Subsidiaries, in each case other than in a fiduciary (including custodial
     or agency) capacity or as a result of debts previously contracted in good
     faith.

          "WESTERN" has the meaning set forth in the preamble to this Agreement.

          "WESTERN BOARD" means the Board of Directors of Western.

          "WESTERN COMMON STOCK" means the common stock, no par value per share,
     of Western.

          "WESTERN COMMON STOCK PRICE PERCENTAGE" has the meaning set forth in
     Section 8.01(f).

          "YEAR 2000 COMPLIANT" has the meaning set forth in Section 5.03(o).


                                   ARTICLE II

                                   THE MERGER

          2.01  THE MERGER.  (a) At the Effective Time, Merger Sub shall merge
with and into Peninsula (the "MERGER"), the separate corporate existence of
Merger Sub shall cease and Peninsula shall survive and continue to exist as a
California corporation (Peninsula, as the surviving corporation in the Merger,
sometimes being referred to herein as the "SURVIVING CORPORATION").  Western may
at any time prior to the Effective Time change the method of effecting the
combination with Peninsula (including, without limitation, the provisions of
this Article II) if and to the extent it deems such change to be necessary,
appropriate or desirable; PROVIDED, HOWEVER, that no such change shall (i) alter
or change the amount or kind of consideration to be issued to holders of
Peninsula Common Stock as provided for in this Agreement (the "MERGER
CONSIDERATION"), (ii) adversely affect the tax treatment of Peninsula's
shareholders as a result of receiving the Merger Consideration or (iii)
materially impede or delay consummation of the transactions contemplated by this
Agreement.

          (b)       Subject to the satisfaction or waiver of the conditions set
forth in Article VII, the Merger shall become effective upon the occurrence of
the filing in the office of the California Secretary of an agreement of merger
in accordance with the CGCL or such later date and time as may be set forth in
such agreement.  The Merger shall have the effects prescribed in the CGCL.

          (c)       ARTICLES OF INCORPORATION AND BY-LAWS.  The articles of
incorporation and by-laws of Peninsula immediately after the Merger, including
without limitation the name of Peninsula, shall be those of Peninsula as in
effect immediately prior to the Effective Time.


                                      -7-
<PAGE>

          (d)       DIRECTORS AND OFFICERS OF THE SURVIVING CORPORATION.  At the
Effective Time, the directors of Merger Sub immediately prior to such Effective
Time shall be the directors of the Surviving Corporation and the officers of
Peninsula immediately prior to such Effective Time shall be the officers of the
Surviving Corporation, in each case, until such time as their successors shall
be duly elected or appointed and qualified.

          2.02  EFFECTIVE DATE AND EFFECTIVE TIME.  On such date as Western
selects (and promptly provides notice thereof to Peninsula), which shall be
within ten days after the last to occur of the expiration of all applicable
waiting periods in connection with approvals of governmental authorities and the
receipt of all approvals of governmental authorities and all conditions to the
consummation of the Merger are satisfied or waived (or, at the election of
Western, on the last business day of the month in which such tenth day occurs
or, if such tenth day occurs on one of the last five business days of such
month, on the last business day of the succeeding month), or on such earlier or
later date as may be agreed in writing by the parties, an agreement of merger
shall be executed in accordance with all appropriate legal requirements and
shall be filed as required by law, and the Merger provided for herein shall
become effective upon such filing or on such date as may be specified in such
agreement of merger.  The date of such filing or such later effective date is
herein called the "Effective Date".  The "Effective Time" of the Merger shall be
the time of such filing or as set forth in such agreement of merger.


                                  ARTICLE III

                       CONSIDERATION; EXCHANGE PROCEDURES

          3.01  MERGER CONSIDERATION.  Subject to the provisions of this
Agreement, at the Effective Time, automatically by virtue of the Merger and
without any action on the part of any Person:

          (a)       OUTSTANDING PENINSULA COMMON STOCK.  Each share, excluding
     Treasury Stock and Dissenters' Shares, of Peninsula Common Stock issued and
     outstanding immediately prior to the Effective Time (which shall, at such
     time, include shares of Peninsula Common Stock issued pursuant to the
     Peninsula Stock Dividend) shall become and be converted into that number of
     shares of Western Common Stock, equal to the quotient obtained by dividing
     (i) $45.75 by (ii) the Average Price (the "EXCHANGE RATIO").  As used
     herein, "AVERAGE PRICE" shall mean the volume weighted average sales price
     per share of Western Common Stock for each of the twenty (20) consecutive
     days (the "DETERMINATION PERIOD") on which shares of Western Common Stock
     are actually traded (each, a "TRADING DAY") immediately preceding the
     fourth Trading Day prior to the Effective Date; PROVIDED, HOWEVER, that if
     the Average Price as so computed would be less than $38.813, then the
     Average Price shall be $38.813; and PROVIDED, FURTHER, that if the Average
     Price as so computed would be greater


                                      -8-
<PAGE>

     than $47.438, then the Average Price shall be $47.438.  The Exchange Ratio 
     shall be subject to adjustment as set forth in Section 3.05.  For purposes 
     of determining the "volume weighted average", the aggregate of the Daily 
     Sales for each of the twenty (20) consecutive Trading Days used in the 
     determination of Average Price shall be divided by the aggregate number of 
     shares traded during such twenty (20) consecutive Trading Days.  As used 
     herein, "DAILY SALES" means the reported sales prices of Western Common 
     Stock traded on Nasdaq on a particular Trading Day.

          (b)       OUTSTANDING WESTERN COMMON STOCK.  Each share of Western
     Common Stock issued and outstanding immediately prior to the Effective Time
     shall remain issued and outstanding and unaffected by the Merger.

          (c)       OUTSTANDING MERGER SUB COMMON STOCK.  Each share of Merger
     Sub Common Stock issued and outstanding immediately prior to the Effective
     Time shall become and be converted into one share of Peninsula Common
     Stock.

          (d)       TREASURY SHARES.  Each share of Peninsula Common Stock held
     as Treasury Stock immediately prior to the Effective Time shall be canceled
     and retired at the Effective Time and no consideration shall be issued in
     exchange therefor.

          (e)       DISSENTING SHAREHOLDERS.  Any Dissenting Shareholder who
     shall be entitled to be paid the "fair value" of his or her Dissenters'
     Shares, as provided in Chapter 13 of the CGCL, shall not be entitled to the
     Merger Consideration as set forth in Section 3.01 in respect thereof unless
     and until such Dissenting Shareholder shall have failed to perfect or shall
     have effectively withdrawn or lost such Dissenting Shareholder's right to
     dissent from the Merger under the CGCL, and shall be entitled to receive
     only the payment provided for by Chapter 13 of the CGCL with respect to
     such Dissenters' Shares.  Upon the payment by the Surviving Corporation of
     the "fair value" of any Dissenters' Shares in accordance with Chapter 13 of
     the CGCL, such Dissenters' Shares shall be canceled and retired and shall
     cease to exist, and no exchange or further payment shall be made with
     respect thereto. If any Dissenting Shareholder shall fail to perfect or
     shall have effectively withdrawn or lost such right to dissent, the
     Dissenters' Shares held by such Dissenting Shareholder shall thereupon be
     treated as though such Dissenters' Shares had been converted into the right
     to receive the Merger Consideration as set forth in Section 3.01(a)
     pursuant to such Section 3.01(a). 

          3.02  RIGHTS AS SHAREHOLDERS; STOCK TRANSFERS.  At the Effective Time,
holders of Peninsula Common Stock shall cease to be, and shall have no rights
as, shareholders of Peninsula, other than to receive any dividend or other
distribution with respect to such Peninsula Common Stock with a record date
occurring prior to the Effective Time and the consideration provided under this
Article III.  After the Effective Time, there shall be no transfers on the stock
transfer books of Peninsula or the Surviving Corporation of shares of Peninsula
Common Stock.


                                      -9-
<PAGE>

          3.03  FRACTIONAL SHARES.  Notwithstanding any other provision hereof,
no fractional shares of Western Common Stock and no certificates or scrip
therefor, or other evidence of ownership thereof, will be issued in the Merger;
instead, Western shall pay to each holder of Peninsula Common Stock who would
otherwise be entitled to a fractional share of Western Common Stock (after
taking into account all Old Certificates delivered by such holder) an amount in
cash (without interest) determined by multiplying such fraction by the average
of the closing prices of Western Common Stock, as reported on Nasdaq (as
reported in THE WALL STREET JOURNAL or, if not reported therein, in another
authoritative source), for the five Nasdaq trading days immediately preceding
the Effective Date.

          3.04  EXCHANGE PROCEDURES.  (a) At or prior to the Effective Time,
Western shall deposit, or shall cause to be deposited, with such bank or trust
company as Western shall elect (which may include a subsidiary of Western) (in
such capacity, the "EXCHANGE AGENT"), for the benefit of the holders of
certificates formerly representing shares of Peninsula Common Stock ("OLD
CERTIFICATES"), for exchange in accordance with this Article III, certificates
representing the shares of Western Common Stock ("NEW CERTIFICATES") and an
estimated amount of cash (such cash and New Certificates, together with any
dividends or distributions with a record date occurring after the Effective Date
with respect thereto (without any interest on any such cash, dividends or
distributions), being hereinafter referred to as the "EXCHANGE FUND") to be paid
pursuant to this Article III in exchange for outstanding shares of Peninsula
Common Stock.

          (b)       As soon as practicable after the Effective Date, Western
shall send or cause to be sent to each former holder of record of shares of
Peninsula Common Stock immediately prior to the Effective Time transmittal
materials for use in exchanging such shareholder's Old Certificates for the
consideration set forth in this Article III, which transmittal materials
Peninsula shall have had the opportunity to review prior to the Effective Date. 
Western shall cause the New Certificates into which shares of a shareholder's
Peninsula Common Stock are converted on the Effective Date and/or any check in
respect of any fractional share interests or dividends or distributions which
such person shall be entitled to receive to be delivered to such shareholder
upon delivery to the Exchange Agent of Old Certificates representing such shares
of Peninsula Common Stock (or an affidavit of lost certificate and, if required
by the Exchange Agent, indemnity reasonably satisfactory to Western and the
Exchange Agent, if any of such certificates are lost, stolen or destroyed) owned
by such shareholder.  No interest will be paid on any such cash to be paid in
lieu of fractional share interests or in respect of dividends or distributions
which any such person shall be entitled to receive pursuant to this Article III
upon such delivery.  In the event of a transfer of ownership of any shares of
Peninsula Common Stock not registered in the transfer records of Peninsula, the
exchange described in this Section 3.04(b) may nonetheless be effected and a
check for the cash to be paid in lieu of fractional shares may be issued to the
transferee if the Old Certificate representing such Peninsula Common Stock is
presented to the Exchange Agent, accompanied by documents sufficient, in the
discretion of


                                     -10-
<PAGE>

Western and the Exchange Agent, (i) to evidence and effect such
transfer but for the provisions of Section 3.02 hereof and (ii) to evidence that
all applicable stock transfer taxes have been paid.

          (c)       If Old Certificates are not surrendered or the consideration
therefor is not claimed prior to the date on which such consideration would
otherwise escheat to or become the property of any governmental unit or agency,
the unclaimed consideration shall, to the extent permitted by abandoned property
and any other applicable law, become the property of the Surviving Corporation
(and to the extent not in its possession shall be paid over to the Surviving
Corporation), free and clear of all claims or interest of any person previously
entitled to such claims.  Notwithstanding the foregoing, neither the Exchange
Agent nor any party hereto shall be liable to any former holder of Peninsula
Common Stock for any amount properly delivered to a public official pursuant to
applicable abandoned property, escheat or similar laws.

          (d)       At the election of Western, no dividends or other
distributions with respect to Western Common Stock with a record date occurring
after the Effective Time shall be paid to the holder of any unsurrendered Old
Certificate representing shares of Peninsula Common Stock converted in the
Merger into the right to receive shares of such Western Common Stock until the
holder thereof shall be entitled to receive New Certificates in exchange
therefor in accordance with the procedures set forth in this Section 3.04, and
no such shares of Peninsula Common Stock shall be eligible to vote until the
holder of Old Certificates is entitled to receive New Certificates in accordance
with the procedures set forth in this Section 3.04.  After becoming so entitled
in accordance with this Section 3.04, the record holder thereof also shall be
entitled to receive any such dividends or other distributions, without any
interest thereon, which theretofore had become payable with respect to shares of
Western Common Stock such holder had the right to receive upon surrender of the
Old Certificate.

          (e)       Any portion of the Exchange Fund that remains unclaimed by
the shareholders of Peninsula for six months after the Effective Time shall be
returned by the Exchange Agent to Western.  Any shareholders of Peninsula who
have not theretofore complied with this Article III shall thereafter look only
to Western for payment of the shares of Western Common Stock, cash in lieu of
any fractional shares and unpaid dividends and distributions on Western Common
Stock deliverable in respect of each share of Peninsula Common Stock such
shareholder holds as determined pursuant to this Agreement, in each case,
without any interest thereon.

          3.05  ANTI-DILUTION PROVISIONS.  In the event Western changes (or
establishes a record date for changing) the number of shares of Western Common
Stock issued and outstanding prior to the Effective Date as a result of a stock
split, stock dividend, recapitalization or similar transaction with respect to
the outstanding Western Common Stock and the record date therefor shall be prior
to the Effective Date, the Exchange Ratio shall be proportionately adjusted. 
If, between the date hereof and the Effective Time, Western shall merge, be
acquired or consolidate with, by or into any other corporation (a "BUSINESS
COMBINATION") and the terms thereof shall


                                     -11-
<PAGE>

provide that Western Common Stock shall be converted into or exchanged for the 
shares of any other corporation or entity, then provision shall be made as part 
of the terms of such Business Combination so that shareholders of Peninsula who 
would be entitled to receive shares of Western Common Stock pursuant to this 
Agreement shall be entitled to receive, in lieu of each share of Western Common 
Stock issuable to such shareholders as provided herein, the same kind and 
amount of securities or assets as shall be distributable upon such Business 
Combination with respect to one share of Western Common Stock (provided that 
nothing herein shall be construed so as to release the acquiring entity in any 
such Business Combination from its obligations under this Agreement as the 
successor to Western).

                                   ARTICLE IV

                          ACTIONS PENDING ACQUISITION

          4.01  FORBEARANCES OF PENINSULA.  From the date hereof until the
Effective Time, except as expressly contemplated by this Agreement, without the
prior written consent of Western, Peninsula will not, and will cause each of its
Subsidiaries not to:

          (a)       ORDINARY COURSE.  Conduct the business of Peninsula and its
     Subsidiaries other than in the ordinary and usual course or fail to use
     reasonable best efforts to preserve intact their business organizations and
     assets and maintain their rights, franchises and existing relations with
     customers, suppliers, employees and business associates, take any action
     that would adversely affect or delay the ability of Peninsula or any of its
     Subsidiaries to perform any of their obligations on a timely basis under
     this Agreement, or take any action that is reasonably likely to have a
     Material Adverse Effect on Peninsula or its Subsidiaries, taken as a whole.

          (b)       CAPITAL STOCK. Other than the payment of the Previously
     Disclosed Peninsula Common Stock dividend (i) issue, sell or otherwise
     permit to become outstanding, or authorize the creation of, any additional
     shares of Peninsula Common Stock or any Rights or (ii) enter into any
     agreement with respect to the foregoing.

          (c)       DIVIDENDS, ETC.  (a) Other than the payment of the Peninsula
     Stock Dividend and the declaration and payment of regular quarterly cash
     dividends of $0.08 per share of Peninsula Common Stock, having declaration,
     record and payment dates consistent with past practice, make, declare, pay
     or set aside for payment any dividend on or in respect of, or declare or
     make any distribution on any shares of Peninsula Common Stock or (b)
     directly or indirectly adjust, split, combine, redeem, reclassify, purchase
     or otherwise acquire, any shares of its capital stock.


                                     -12-
<PAGE>

          (d)       COMPENSATION; EMPLOYMENT AGREEMENTS; ETC.  Enter into or
     amend or renew any employment, consulting, severance or similar agreements
     or arrangements with any director, officer or employee of Peninsula or its
     Subsidiaries, or grant any salary or wage increase or increase any employee
     benefit (including incentive or bonus payments), except (i) for normal
     individual increases in compensation to employees in the ordinary course of
     business consistent with past practice, (ii) for other changes that are
     required by applicable law, (iii) to satisfy Previously Disclosed
     contractual obligations existing as of the date hereof or (iv) for grants
     of awards to newly hired employees consistent with past practice.

          (e)       BENEFIT PLANS.  Enter into, establish, adopt or amend
     (except (i) as may be required by applicable law or (ii) to satisfy
     Previously Disclosed contractual obligations existing as of the date
     hereof) any pension, retirement, stock purchase, savings, profit sharing,
     deferred compensation, consulting, bonus, group insurance or other employee
     benefit, incentive or welfare contract, plan or arrangement, or any trust
     agreement (or similar arrangement) related thereto, in respect of any
     director, officer or employee of Peninsula or its Subsidiaries, or take any
     action to accelerate the vesting or exercisability of any compensation or
     benefits payable thereunder.

          (f)       DISPOSITIONS.  Except as Previously Disclosed, sell,
     transfer, mortgage, encumber or otherwise dispose of or discontinue any of
     its assets, deposits, business or properties except in the ordinary course
     of business and in a transaction that is not material to it and its
     Subsidiaries taken as a whole.  

          (g)       ACQUISITIONS.  Except as Previously Disclosed, acquire
     (other than by way of foreclosures or acquisitions of control in a bona
     fide fiduciary capacity or in satisfaction of debts previously contracted
     in good faith, in each case in the ordinary and usual course of business
     consistent with past practice) all or any portion of, the assets, business,
     deposits or properties of any other entity except in the ordinary course of
     business consistent with past practice and in a transaction that is not
     material to Peninsula and its Subsidiaries, taken as a whole.

          (h)       CAPITAL EXPENDITURES.  Except as Previously Disclosed, make
     any capital expenditures other than capital expenditures in the ordinary
     course of business consistent with past practice in amounts not exceeding
     $50,000 individually or $100,000 in the aggregate.

          (i)       GOVERNING DOCUMENTS.  Amend the Peninsula Articles,
     Peninsula By-Laws or the articles of incorporation or by-laws (or similar
     governing documents) of any of Peninsula's Subsidiaries.


                                     -13-
<PAGE>

          (j)       ACCOUNTING METHODS.  Implement or adopt any change in its
     accounting principles, practices or methods, other than as may be required
     by generally accepted accounting principles.

          (k)       CONTRACTS.  Except in the ordinary course of business
     consistent with past practice, enter into or terminate any material
     contract (as defined in Section 5.03(k)) or amend or modify in any material
     respect any of its existing material contracts.

          (l)       CLAIMS.  Except in the ordinary course of business
     consistent with past practice, settle any claim, action or proceeding,
     except for any claim, action or proceeding involving solely money damages
     in an amount, individually or in the aggregate for all such settlements,
     that is not material to Peninsula and its Subsidiaries, taken as a whole.

          (m)  ADVERSE ACTIONS.  (a) Take any action while knowing that such
     action would, or is reasonably likely to, prevent or impede the Merger from
     qualifying (i) for "pooling-of-interests" accounting treatment or (ii) as a
     reorganization within the meaning of Section 368 of the Code; or (b)
     knowingly take any action that is intended or is reasonably likely to
     result in (i) any of its representations and warranties set forth in this
     Agreement being or becoming untrue in any material respect at any time at
     or prior to the Effective Time, (ii) any of the conditions to the Merger
     set forth in Article VII not being satisfied including, but not limited to,
     any action which would reasonably be expected to adversely affect or delay
     the ability of Western, Peninsula or Merger Sub to obtain any necessary
     approvals, consents or waivers of any Regulatory Agencies required for the
     transactions contemplated by this Agreement or (iii) a material violation
     of any provision of this Agreement, except, in each case, as may be
     required by applicable law or regulation .

          (n)  RISK MANAGEMENT.  Except as required by applicable law or
     regulation, (i) implement or adopt any material change in its interest rate
     and other risk management policies, procedures or practices; (ii) fail to
     follow its existing policies or practices with respect to managing its
     exposure to interest rate and other risk; or (iii) fail to use commercially
     reasonable means to avoid any material increase in its aggregate exposure
     to interest rate risk.

          (o)       INDEBTEDNESS.  Incur any indebtedness for borrowed money
     other than in the ordinary course of business consistent with past
     practice.

          (p)       COMMITMENTS.  Agree or commit to do any of the foregoing.

          4.02  FORBEARANCES OF WESTERN.  From the date hereof until the
     Effective Time, except as expressly contemplated by this Agreement, without
     the prior written consent of Peninsula, Western will not, and will cause
     each of its Subsidiaries not to:


                                     -14-
<PAGE>

          (a)       ORDINARY COURSE.  Take any action that would adversely
     affect or delay the ability of Peninsula or Western to perform any of their
     obligations on a timely basis under this Agreement, or take any action that
     is reasonably likely to have a Material Adverse Effect on Western or its
     Subsidiaries, taken as a whole.

          (b)       ADVERSE ACTIONS.  (a) Take any action while knowing that
     such action would, or is reasonably likely to, prevent or impede the Merger
     from qualifying (i) for "pooling-of-interests" accounting treatment or
     (ii) as a reorganization within the meaning of Section 368 of the Code; or
     (b) knowingly take any action that is intended or is reasonably likely to
     result in (i) any of its representations and warranties set forth in this
     Agreement being or becoming untrue in any material respect at any time at
     or prior to the Effective Time, (ii) any of the conditions to the Merger
     set forth in Article VII not being satisfied including, but not limited to,
     any action which would reasonably be expected to adversely affect or delay
     the ability of Western, Peninsula or Merger Sub to obtain any necessary
     approvals, consents or waivers of any Regulatory Agencies required for the
     transactions contemplated by this Agreement or (iii) a material violation
     of any provision of this Agreement, except, in each case, as may be
     required by applicable law or regulation.


                                   ARTICLE V

                         REPRESENTATIONS AND WARRANTIES

          5.01  DISCLOSURE SCHEDULE.  On or prior to the date hereof, Peninsula
has delivered to Western and Western has delivered to Peninsula a schedule
(respectively, its "DISCLOSURE SCHEDULE") setting forth, among other things,
items the disclosure of which is necessary or appropriate either in response to
an express disclosure requirement contained in a provision hereof or as an
exception to one or more representations or warranties contained in Section 5.03
or 5.04; PROVIDED, that (a) no such item is required to be set forth in a
Disclosure Schedule as an exception to a representation or warranty if its
absence would not be reasonably likely to result in the related representation
or warranty being deemed untrue or incorrect under the standard established by
Section 5.02, and (b) the mere inclusion of an item in a Disclosure Schedule as
an exception to a representation or warranty shall not be deemed an admission by
a party that such item represents a material exception or fact, event or
circumstance or that such item is reasonably likely to result in a Material
Adverse Effect.

          5.02  STANDARD.  No representation or warranty of Peninsula or Western
contained in Section 5.03 or 5.04 shall be deemed untrue or incorrect, and no
party hereto shall be deemed to have breached a representation or warranty, as a
consequence of the existence of any fact, event or circumstance unless such
fact, circumstance or event, individually or taken together with all other
facts, events or circumstances inconsistent with any representation or warranty
contained in


                                      -15-
<PAGE>

Section 5.03 or 5.04 has had or is reasonably likely to have a
Material Adverse Effect on the party making such representation or warranty.

          5.03  REPRESENTATIONS AND WARRANTIES OF PENINSULA.  Subject to 
Sections 5.01 and 5.02 and except as Previously Disclosed in a paragraph of its
Disclosure Schedule corresponding to the relevant paragraph below, Peninsula
hereby represents and warrants to Western:

          (a)       ORGANIZATION, STANDING AND AUTHORITY.  Peninsula is a
     corporation duly organized, validly existing and in good standing under the
     laws of the State of California.  Peninsula is duly qualified to do
     business and is in good standing in the states of the United States and any
     foreign jurisdictions where its ownership or leasing of property or assets
     or the conduct of its business requires it to be so qualified.  

          (b)       PENINSULA COMMON STOCK.  As of the date hereof, the
     authorized capital stock of Peninsula consists solely of 10,000,000 shares
     of Peninsula Common Stock, of which no more than 2,487,087 shares after
     giving effect to the Previously Disclosed Peninsula Stock Dividend shares
     were outstanding as of the date hereof.  As of the date hereof, no shares
     of Peninsula Common Stock were held in treasury by Peninsula or otherwise
     beneficially owned by Peninsula or its Subsidiaries.  The outstanding
     shares of Peninsula Common Stock have been duly authorized and are validly
     issued and outstanding, fully paid and nonassessable, subject to no
     preemptive rights and were not issued in violation of any preemptive
     rights.  As of the date hereof, there are no shares of Peninsula Common
     Stock authorized and reserved for issuance, Peninsula does not have any
     Rights issued or outstanding with respect to Peninsula Common Stock, and
     Peninsula does not have any commitment to authorize, issue or sell any
     Peninsula Common Stock or Rights, except pursuant to this Agreement and the
     Stock Option Agreement.

          (c)       SUBSIDIARIES. (i)(A)Peninsula has Previously Disclosed a
     list of all of its Subsidiaries together with the jurisdiction of
     organization of each such Subsidiary,(B) Peninsula owns, directly or
     indirectly, all the issued and outstanding equity securities of each of its
     Subsidiaries, (C) no equity securities of any of its Subsidiaries are or
     may become required to be issued (other than to it or its wholly owned
     Subsidiaries) by reason of any Right or otherwise, (D) there are no
     contracts, commitments, understandings or arrangements by which any of such
     Subsidiaries is or may be bound to sell or otherwise transfer any equity
     securities of any such Subsidiaries (other than to it or its wholly-owned
     Subsidiaries), (E) there are no contracts, commitments, understandings, or
     arrangements relating to its rights to vote or to dispose of such
     securities and (F) all the equity securities of each Subsidiary held by
     Peninsula or its Subsidiaries are fully paid and nonassessable and are
     owned by Peninsula or its Subsidiaries free and clear of any Liens.


                                     -16-
<PAGE>

          (ii)      Peninsula does not own beneficially, directly or indirectly,
     any equity securities or similar interests of any Person, or any interest
     in a partnership or joint venture of any kind, other than its Subsidiaries.

          (iii)     Each of Peninsula's Subsidiaries has been duly organized and
     is validly existing in good standing under the laws of the jurisdiction of
     its organization, and is duly qualified to do business and in good standing
     in the jurisdictions where its ownership or leasing of property or the
     conduct of its business requires it to be so qualified.

          (d)       CORPORATE POWER.  Peninsula and each of its Subsidiaries has
     the corporate power and authority to carry on its business as it is now
     being conducted and to own all its properties and assets; and Peninsula has
     the corporate power and authority to execute, deliver and perform its
     obligations under this Agreement and the Stock Option Agreement and to
     consummate the transactions contemplated hereby and thereby.

          (e)       CORPORATE AUTHORITY.  Subject in the case of this Agreement
     to receipt of the requisite approval of the agreement of merger set forth
     in this Agreement by the holders of a majority of the outstanding shares of
     Peninsula Common Stock entitled to vote thereon (which is the only
     shareholder vote required thereon), this Agreement, the Stock Option
     Agreement and the transactions contemplated hereby and thereby have been
     authorized by all necessary corporate action of Peninsula and the Peninsula
     Board on or prior to the date hereof.  This Agreement is a valid and
     legally binding obligation of Peninsula, enforceable in accordance with its
     terms (except as enforceability may be limited by 12 U.S.C. 1818(b)(6)(D)
     or applicable bankruptcy, insolvency, reorganization, moratorium,
     fraudulent transfer and similar laws of general applicability relating to
     or affecting creditors' rights or by general equity principles).  The
     Peninsula Board has received the written opinion of NationsBanc Montgomery
     Securities LLC to the effect that as of the date hereof the consideration
     to be received by the holders of Peninsula Common Stock in the Merger is
     fair to the holders of Peninsula Common Stock from a financial point of
     view.

          (f)       REGULATORY APPROVALS; NO DEFAULTS.  (i) No consents or
     approvals of, or filings or registrations with, any Governmental Authority
     or with any third party are required to be made or obtained by Peninsula or
     any of its Subsidiaries in connection with the execution, delivery or
     performance by Peninsula of this Agreement or the Stock Option Agreement or
     to consummate the Merger except for (A) filings of applications or notices
     with the Commissioner, the FDIC and the Federal Reserve, (B) filings with
     the SEC and state securities authorities and the approval of this Agreement
     by the shareholders of Peninsula, (C) the filing of an agreement of merger
     with the California Secretary pursuant to the CGCL and (D) the permit
     required under Section 691 of the California Financial Code with respect to
     the Stock Option Agreement.  As of the date hereof, Peninsula is not aware
     of any reason


                                     -17-
<PAGE>

     why the approvals set forth in Section 7.01(b) will not be
     received without the imposition of a condition, restriction or requirement
     of the type described in Section 7.01(b).

          (ii)      Subject to receipt of the regulatory approvals referred to
     in the preceding paragraph, and the expiration of related waiting periods,
     and required filings under federal and state securities laws, the
     execution, delivery and performance of this Agreement and the Stock Option
     Agreement and the consummation of the transactions contemplated hereby and
     thereby do not and will not (A) constitute a breach or violation of, or a
     default under, or give rise to any Lien, any acceleration of remedies or
     any right of termination under, any law, rule or regulation or any
     judgment, decree, order, governmental permit or license, or agreement,
     indenture or instrument of Peninsula or of any of its Subsidiaries or to
     which Peninsula or any of its Subsidiaries or properties is subject or
     bound, (B) constitute a breach or violation of, or a default under, the
     Peninsula Articles or the Peninsula By-Laws, or (C) require any consent or
     approval under any such law, rule, regulation, judgment, decree, order,
     governmental permit or license, agreement, indenture or instrument.

          (g)       FINANCIAL REPORTS AND REGULATORY DOCUMENTS.  (i)   The
     balance sheet of Peninsula as of December 31, 1997, and the related
     statements of income, cash flow and changes in financial position of
     Peninsula for the year then ended, audited by Deloitte & Touche LLP, and
     the call report of Peninsula as of March 31, 1998 and for the three months
     then ended, fairly present, subject in the case of the call report to
     recurring year-end audit adjustments normal in nature and amount, the
     financial position of Peninsula as of such dates and the results of the
     operations of Peninsula for the periods then ended, all in accordance with
     generally accepted accounting principles ("GAAP") consistently applied. The
     call reports to be filed by Peninsula with the FDIC after the date hereof
     will comply with applicable accounting requirements and with the published
     rules and regulations of the FDIC with respect thereto; and each of such
     statements will be prepared in accordance with GAAP consistently applied
     during the periods involved, except as indicated in the notes thereto or as
     permitted by the call report forms. The books and records of Peninsula have
     been, and are being, maintained in accordance with GAAP and any other
     applicable legal and accounting requirements.

          (ii)      Peninsula has timely filed all reports, registrations and
     statements, together with any amendments required to be made with respect
     thereto, that they were required to file since December 31, 1996 with (A)
     the Federal Reserve, (B) the FDIC, (C) the State of California and (D) the
     Commissioner (collectively, the "REGULATORY AGENCIES"), and all other
     material reports and statements required to be filed by it since December
     31, 1996, including, without limitation, any report or statement required
     to be filed pursuant to the laws of the United States or the State of
     California and the rules and regulations of the Federal Reserve, the FDIC
     or the Commissioner, and has paid all fees and assessments due and payable
     in connection therewith.  As of their respective dates, such reports,
     registrations and statements


                                     -18-
<PAGE>

     complied in all material respects with all the laws, rules and regulations 
     of the applicable Regulatory Agency with which they were filed.

          (iii)     Since December 31, 1997, Peninsula and its Subsidiaries have
     not incurred any liability other than in the ordinary course of business
     consistent with past practice.

          (iv)      Since December 31, 1997, (A) Peninsula and its Subsidiaries 
     have conducted their respective businesses in the ordinary and usual course
     consistent with past practice (excluding the incurrence of expenses related
     to this Agreement and the transactions contemplated hereby) and (B) no
     event has occurred or circumstance arisen that, individually or taken
     together with all other facts, circumstances and events (described in any
     paragraph of Section 5.03 or otherwise), is reasonably likely to have a
     Material Adverse Effect with respect to Peninsula.

          (v)       Peninsula is not, and since December 31, 1996 was not,
     required to register the Peninsula Common Stock with the FDIC pursuant to
     Section 12 of the Exchange Act.

          (h)       LITIGATION.  No litigation, claim or other proceeding before
any court or governmental agency is pending against Peninsula or any of its
Subsidiaries and, to Peninsula's knowledge, no such litigation, claim or other
proceeding has been threatened.

          (i)       REGULATORY MATTERS.  (i)  Neither Peninsula nor any of its
Subsidiaries or any of their properties is a party to or is subject to any
order, decree, agreement, memorandum of understanding or similar arrangement
with, or a commitment letter or similar submission to, or extraordinary
supervisory letter from, any federal or state governmental agency or authority
charged with the supervision or regulation of financial institutions or issuers
of securities or engaged in the insurance of deposits (including, without
limitation, the Commissioner and the FDIC) or the supervision or regulation of
it or any of its Subsidiaries.

          (ii)      Neither Peninsula nor any of its Subsidiaries has been
advised by any Regulatory Authority that such Regulatory Authority is
contemplating issuing or requesting (or is considering the appropriateness of
issuing or requesting) any such order, decree, agreement, memorandum of
understanding, commitment letter, supervisory letter or similar submission.

          (j)       COMPLIANCE WITH LAWS.  Peninsula and each of its
Subsidiaries:

                    (i)  is in compliance with all applicable federal, state,
          local and foreign statutes, laws, regulations, ordinances, rules,
          judgments, orders or decrees applicable thereto or to the employees
          conducting such businesses, including, without limitation, the Equal
          Credit Opportunity Act, the Fair Housing Act, the Community
          Reinvestment Act, the


                                     -19-
<PAGE>

          Home Mortgage Disclosure Act and all other applicable fair lending 
          laws and other laws relating to discriminatory business practices; 

               (ii) has all permits, licenses, authorizations, orders and
          approvals of, and has made all filings, applications and registrations
          with, all Governmental Authorities that are required in order to
          permit them to own or lease their properties and to conduct their
          businesses as presently conducted; all such permits, licenses,
          certificates of authority, orders and approvals are in full force and
          effect and, to Peninsula's knowledge, no suspension or cancellation of
          any of them is threatened; and

               (iii)     has received, since December 31, 1995, no notification
          or communication from any Governmental Authority (A) asserting that
          Peninsula or any of its Subsidiaries is not in compliance with any of
          the statutes, regulations or ordinances which such Governmental
          Authority enforces or (B) threatening to revoke any license,
          franchise, permit or governmental authorization (nor, to Peninsula's
          knowledge, do any grounds for any of the foregoing exist).

          (k)       MATERIAL CONTRACTS; DEFAULTS.  Neither Peninsula nor any of
     its Subsidiaries is a party to, bound by or subject to any agreement,
     contract, arrangement, commitment or understanding (whether written or
     oral) (i) that is a "material contract" within the meaning of
     Item 601(b)(10) of the SEC's Regulation S-K or (ii) that materially
     restricts the conduct of business by it or any of its Subsidiaries. 
     Neither Peninsula nor any of its Subsidiaries is in default under any
     contract, agreement, commitment, arrangement, lease, insurance policy or
     other instrument to which it is a party, by which its respective assets,
     business, or operations may be bound or affected, or under which it or its
     respective assets, business, or operations receives benefits, and there has
     not occurred any event that, with the lapse of time or the giving of notice
     or both, would constitute such a default.

          (l)       NO BROKERS.  No action has been taken by Peninsula that
     would give rise to any valid claim against any party hereto for a brokerage
     commission, finder's fee or other like payment with respect to the
     transactions contemplated by this Agreement, excluding a Previously
     Disclosed fee to be paid to NationsBanc Montgomery Securities LLC. 

          (m)       EMPLOYEE BENEFIT PLANS.

               (i)  All benefit and compensation plans, contracts, policies or
          arrangements covering current employees or former employees of
          Peninsula and its subsidiaries (the "EMPLOYEES") and current or former
          directors of Peninsula, including, but not limited to, "employee
          benefit plans" within the meaning of Section 3(3) of ERISA, and
          deferred compensation, stock option, stock purchase, stock
          appreciation rights, stock based, incentive and bonus plans (the
          "BENEFIT PLANS"), are Previously Disclosed.  True and


                                     -20-
<PAGE>

          complete copies of all Benefit Plans, including, but not limited to, 
          any trust instruments and insurance contracts forming a part of any 
          Benefit Plans, and all amendments thereto have been provided or made 
          available to Western.

               (ii) All employee benefit plans, other than "multiemployer plans"
          within the meaning of Section 3(37) of ERISA, covering Employees (the
          "PLANS"), to the extent subject to ERISA, are in substantial
          compliance with ERISA.  Peninsula is not a party to any "employee
          pension benefit plan" within the meaning of Section 3(2) of ERISA
          ("PENSION PLAN") and which is intended to be qualified under Section
          401(a) of the Code.   There is no material pending or threatened
          litigation relating to the Plans.  Neither Peninsula nor any of its
          Subsidiaries has engaged in a transaction with respect to any Plan
          that, assuming the taxable period of such transaction expired as of
          the date hereof, could subject Peninsula or any Subsidiary to a tax or
          penalty imposed by either Section 4975 of the Code or Section 502(i)
          of ERISA in an amount which would be material.

               (iii)     No liability under Subtitle C or D of Title IV of ERISA
          has been or is expected to be incurred by Peninsula or any of its
          Subsidiaries with respect to any ongoing, frozen or terminated
          "single-employer plan", within the meaning of Section 4001(a)(15) of
          ERISA, currently or formerly maintained by any of them, or the 
          single-employer plan of any entity which is considered one employer 
          with Peninsula under Section 4001 of ERISA or Section 414 of the Code
          (an "ERISA AFFILIATE").  Neither Peninsula, any of its Subsidiaries 
          nor an ERISA Affiliate has contributed to a "multiemployer plan", 
          within the meaning of Section 3(37) of ERISA.  No notice of a 
          "reportable event", within the meaning of Section 4043 of ERISA for 
          which the 30-day reporting requirement has not been waived, has been 
          required to be filed for any Pension Plan or by any ERISA Affiliate 
          within the 12-month period ending on the date hereof or will be 
          required to be filed in connection with the transactions contemplated 
          by this Agreement. 

               (iv) All contributions required to be made under the terms of any
          Plan have been timely made or have been reflected on the consolidated
          financial statements of Peninsula included in the Regulatory
          Documents.  Neither any Pension Plan nor any single-employer plan of
          an ERISA Affiliate has an "accumulated funding deficiency" (whether or
          not waived) within the meaning of Section 412 of the Code or
          Section 302 of ERISA and no ERISA Affiliate has an outstanding funding
          waiver.  Neither Peninsula nor any of its Subsidiaries has provided,
          or is required to provide, security to any Pension Plan or to any
          single-employer plan of an ERISA Affiliate pursuant to Section
          401(a)(29) of the Code.

               (v)  Under each Pension Plan which is a single-employer plan, as
          of the last day of the most recent plan year ended prior to the date
          hereof, the actuarially determined present value of all "benefit
          liabilities", within the meaning of Section 4001(a)(16) of


                                     -21-
<PAGE>

          ERISA (as determined on the basis of the actuarial assumptions 
          contained in the Plan's most recent actuarial valuation), did not 
          exceed the then current value of the assets of such Plan, and there 
          has been no material change in the financial condition of such Plan 
          since the last day of the most recent plan year.

               (vi) Neither Peninsula nor any of its Subsidiaries has any
          obligations for retiree health and life benefits under any Benefit
          Plan.  Peninsula or its Subsidiaries may amend or terminate any such
          Benefit Plan at any time without incurring any liability thereunder.

               (vii)     The consummation of the transactions contemplated by
          this Agreement will not (x) entitle any employees of Peninsula or any
          of its Subsidiaries to severance pay, (y) accelerate the time of
          payment or vesting or trigger any payment of compensation or benefits
          under, increase the amount payable or trigger any other material
          obligation pursuant to, any of the Benefit Plans or (z) result in any
          breach or violation of, or a default under, any of the Benefit Plans. 
          Without limiting the foregoing, as a result of the consummation of the
          transactions contemplated by this Agreement, neither Peninsula nor any
          of its Subsidiaries will be obligated to make a payment to an
          individual that would be a "parachute payment" to a "disqualified
          individual" as those terms are defined in Section 280G of the Code,
          without regard to whether such payment is reasonable compensation for
          personal services performed or to be performed in the future.

          (n)       LABOR MATTERS.  Neither Peninsula nor any of its
     Subsidiaries is a party to or is bound by any collective bargaining
     agreement, contract or other agreement or understanding with a labor union
     or labor organization, nor is Peninsula or any of its Subsidiaries the
     subject of a proceeding asserting that it or any such Subsidiary has
     committed an unfair labor practice (within the meaning of the National
     Labor Relations Act) or seeking to compel Peninsula or any such Subsidiary
     to bargain with any labor organization as to wages or conditions of
     employment, nor is there any strike or other labor dispute involving it or
     any of its Subsidiaries pending or, to Peninsula's knowledge, threatened,
     nor is Peninsula aware of any activity involving its or any of its
     Subsidiaries' employees seeking to certify a collective bargaining unit or
     engaging in other organizational activity.

          (o)       YEAR 2000 COMPLIANCE.  Except as Previously Disclosed, (i)
     Peninsula's computer software and related hardware (the "COMPUTER SYSTEM")
     used for the storage and processing of data are or will be prior to the
     year 2000 Year 2000 Compliant; (ii) none of Peninsula's Computer System,
     operations or business functions of Peninsula will be materially adversely
     affected by any third party's failure to be Year 2000 Compliant; to the
     best of Peninsula's knowledge after due inquiry, all of its suppliers,
     customers and third party providers are, or will be prior to year 2000,
     Year 2000 Compliant; and (iii) Peninsula is taking or has taken, all
     necessary and appropriate action to address and remedy any deficiencies in
     its Computer System which would keep it from becoming Year 2000 Compliant. 
     As used herein, "YEAR


                                     -22-
<PAGE>

     2000 COMPLIANT" shall mean the ability of a Computer System to provide the 
     following functions, without human intervention, individually and in 
     combination with other products or systems:  (i) consistently handle, 
     record, store, process and present dates and date-related information 
     before, during and after January 1, 2000, including but not limited to 
     accepting date input, performing calculations on dates or portion of dates,
     and providing date output; (ii) function accurately in accordance with the 
     published specifications and without undue interruption, before, during, 
     and after January 1, 2000 (including leap year computations) without any 
     adverse change in operation associated with the advent of the year 2000; 
     (iii) respond to two-digit or four-digit dates and date-related input in a 
     way that resolves any ambiguity as to the year 2000 in a disclosed, defined
     and predetermined manner, and store and provide output of dates and 
     date-related information in ways that are unambiguous as to the year 2000; 
     and (iv) suitably interact with other software and related hardware in a 
     way which does not compromise its year 2000 compliance capability.

          (p)       ENVIRONMENTAL MATTERS.

               (i)  Peninsula and each of its Subsidiaries has complied at all
          times with applicable Environmental Laws; (ii) no real property
          (including buildings or other structures) currently or formerly owned
          or operated by Peninsula or any of its Subsidiaries, or any property
          in which Peninsula or any of its Subsidiaries has held a security
          interest, lien or a fiduciary or management role ("Loan Property"),
          has been contaminated with, or has had any release of, any Hazardous
          Substance; (iii) neither Peninsula nor any of its Subsidiaries could
          be deemed the owner or operator of any Loan Property under any
          Environmental Law which such Loan Property has been contaminated with,
          or has had any release of, any Hazardous Substance; (iv) neither
          Peninsula nor any of its Subsidiaries is subject to liability for any
          Hazardous Substance disposal or contamination on any third party
          property; (v) neither Peninsula nor any of its Subsidiaries has
          received any notice, demand letter, claim or request for information
          alleging any violation of, or liability under, any Environmental Law;
          (vi) neither Peninsula nor any of its Subsidiaries is subject to any
          order, decree, injunction or other agreement with any Governmental
          Authority or any third party relating to any Environmental Law; (vii)
          to the best of Peninsula's knowledge, there are no circumstances or
          conditions (including the presence of asbestos, underground storage
          tanks, lead products, polychlorinated biphenyls, prior manufacturing
          operations, dry-cleaning, or automotive services) involving Peninsula
          or any of its Subsidiaries, any currently or formerly owned or
          operated property, or any Loan Property, that could reasonably be
          expected to result in any claims, liability or investigations against
          Peninsula or any of its Subsidiaries or result in any restrictions on
          the ownership, use, or transfer of any property pursuant to any
          Environmental Law; and (viii) Peninsula has delivered to Western
          copies of all environmental reports, studies, sampling data,
          correspondence, filings and other environmental information in its


                                     -23-
<PAGE>

          possession or reasonably available to it relating to Peninsula, any
          Subsidiary of Peninsula, any currently or formerly owned or operated
          property or any Loan Property.

               As used herein, the term "ENVIRONMENTAL LAW" means any federal,
          state or local law, regulation, order, decree, permit, authorization,
          opinion, common law or agency requirement relating to: (A) the
          protection or restoration of the environment, health, safety, or
          natural resources, (B) the handling, use, presence, disposal, release
          or threatened release of any Hazardous Substance or (C) noise, odor,
          wetlands, indoor air, pollution, contamination or any injury or threat
          of injury to persons or property in connection with any Hazardous
          Substance and the term "HAZARDOUS SUBSTANCE" means any substance in
          any concentration that is: (A) listed, classified or regulated
          pursuant to any Environmental Law; (B) any petroleum product or 
          by-product, asbestos-containing material, lead-containing paint or
          plumbing, polychlorinated biphenyls, radioactive materials or radon;
          or (C) any other substance which is or may be the subject of
          regulatory action by any Governmental Authority in connection with any
          Environmental Law.

          (q)       TAX MATTERS.  (i) (A) All Tax Returns that are required to
     be filed (taking into account any extensions of time within which to file)
     by or with respect to Peninsula and its Subsidiaries have been duly filed,
     (B) all Taxes due have been paid in full, (C) the Tax Returns referred to
     in clause (A) have been examined by the Internal Revenue Service or the
     appropriate Tax authority or the period for assessment of the Taxes in
     respect of which such Tax Returns were required to be filed has expired,
     (D) all deficiencies asserted or assessments made as a result of such
     examinations have been paid in full, (E) no issues that have been raised by
     the relevant taxing authority in connection with the examination of any of
     the Tax Returns referred to in clause (A) are currently pending, and (F) no
     waivers of statutes of limitation have been given by or requested with
     respect to any Taxes of Peninsula or its Subsidiaries.  Peninsula has made
     available to Western true and correct copies of the United States federal
     income Tax Returns filed by Peninsula and its Subsidiaries for each of the
     three most recent fiscal years ended on or before December 31, 1997. 
     Neither Peninsula nor any of its Subsidiaries has any liability with
     respect to income, franchise or similar Taxes that accrued on or before the
     end of the most recent period covered by Peninsula's Regulatory Documents
     filed prior to the date hereof in excess of the amounts accrued with
     respect thereto that are reflected in the financial statements included in
     Peninsula's Regulatory Documents filed on or prior to the date hereof. 
     Neither Peninsula nor any of its Subsidiaries is a party to any Tax
     allocation or sharing agreement, is or has been a member of an affiliated
     group filing consolidated or combined Tax returns (other than a group the
     common parent of which is or was Peninsula) or otherwise has any liability
     for the Taxes of any person (other than Peninsula and its Subsidiaries). 
     As of the date hereof, neither Peninsula nor any of its Subsidiaries has
     any reason to believe that any conditions exist that


                                     -24-
<PAGE>

     might prevent or impede the Merger from qualifying as a reorganization 
     within the meaning of Section 368 of the Code.

          (ii)      No Tax is required to be withheld pursuant to Section 1445
     of the Code as a result of the transfer contemplated by this Agreement.

          (r)       RISK MANAGEMENT INSTRUMENTS.  All interest rate swaps, caps,
     floors, option agreements, futures and forward contracts and other similar
     risk management arrangements, whether entered into for Peninsula's own
     account, or for the account of one or more of Peninsula's Subsidiaries or
     their customers (all of which are listed on Peninsula's Disclosure
     Schedule), if any, were entered into (i) in accordance with prudent
     business practices and all applicable laws, rules, regulations and
     regulatory policies and (ii) with counterparties believed to be financially
     responsible at the time; and each of them constitutes the valid and legally
     binding obligation of Peninsula or one of its Subsidiaries, enforceable in
     accordance with its terms (except as enforceability may be limited by
     applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent
     transfer and similar laws of general applicability relating to or affecting
     creditors' rights or by general equity principles), and are in full force
     and effect.  Neither Peninsula nor its Subsidiaries, nor to Peninsula's
     knowledge, any other party thereto, is in breach of any of its obligations
     under any such agreement or arrangement.

          (s)       BOOKS AND RECORDS.  The books and records of Peninsula and
     its Subsidiaries have been fully, properly and accurately maintained in all
     material respects, and there are no material inaccuracies or discrepancies
     of any kind contained or reflected therein, and they fairly present the
     financial position of Peninsula and its Subsidiaries.

          (t)       INSURANCE.  Peninsula has Previously Disclosed all of the
     insurance policies, binders, or bonds maintained by Peninsula or its
     Subsidiaries ("INSURANCE POLICIES").  Peninsula and its Subsidiaries are
     insured with reputable insurers against such risks and in such amounts as
     the management of Peninsula reasonably has determined to be prudent for its
     business, operations, properties and assets.  All the Insurance Policies
     are in full force and effect; Peninsula and its Subsidiaries are not in
     material default thereunder; and all claims thereunder have been filed in
     due and timely fashion.

          (u)       ACCOUNTING TREATMENT.  As of the date hereof, Peninsula is
     not aware of any reason why the Merger will fail to qualify for 
     "pooling-of-interests" accounting treatment.

          (v)       TRUST BUSINESS.  Peninsula neither acts as trustee, agent,
fiscal agent, escrow agent, custodian or in another similar capacity for any
other person, nor otherwise performs any fiduciary or trust functions.


                                     -25-
<PAGE>

          5.04  REPRESENTATIONS AND WARRANTIES OF WESTERN.  Subject to
Sections 5.01 and 5.02 and except as Previously Disclosed in a paragraph of its
Disclosure Schedule corresponding to the relevant paragraph below, Western
hereby represents and warrants to Peninsula as follows:

          (a)       ORGANIZATION, STANDING AND AUTHORITY; SUBSIDIARIES. Each of
     Western and Merger Sub is a corporation duly organized, validly existing
     and in good standing under the laws of the State of California.  Each of
     Western and Merger Sub is duly qualified to do business and is in good
     standing in the states of the United States and foreign jurisdictions where
     its ownership or leasing of property or assets or the conduct of its
     business requires it to be so qualified.  Each of Western and Merger Sub
     has in effect all federal, state, local, and foreign governmental
     authorizations necessary for it to own or lease its properties and assets
     and to carry on its business as it is now conducted.  Each of Western's
     Significant Subsidiaries has been duly organized and is validly existing in
     good standing under the laws of the jurisdiction of its organization, and
     is duly qualified to do business and in good standing in the jurisdictions
     where its ownership or leasing of property or the conduct of its business
     requires it to be so qualified.

          (b)       WESTERN CAPITAL STOCK.  As of the date hereof, the
     authorized capital stock of Western consists solely of 100,000,000 shares
     of Western Common Stock, of which no more than 15,705,000 shares were
     outstanding as of the date hereof and 5,000,000 shares of Western Preferred
     Stock, of which no shares were outstanding as of the date hereof.

          (c)       MERGER SUB CAPITAL STOCK.  As of the date hereof, the
     authorized capital stock of Merger Sub consists solely of 100 shares of
     Merger Sub Common Stock, of which one share was outstanding as of the date
     hereof.

          (d)       CORPORATE POWER.  Western and each of its Significant
     Subsidiaries has the corporate power and authority to carry on its business
     as it is now being conducted and to own all its properties and assets; and
     each of Western and Merger Sub has the corporate power and authority to
     execute, deliver and perform its obligations under this Agreement and to
     consummate the transactions contemplated hereby.

          (e)       CORPORATE AUTHORITY.  This Agreement and the transactions
     contemplated hereby have been authorized by all necessary corporate action
     of each of Western and Merger Sub and their respective Boards of Directors.
     This Agreement is a valid and legally binding agreement of each of Western
     and Merger Sub enforceable in accordance with its terms (except as
     enforceability may be limited by 12 U.S.C. 1818(b)(6)(D) or applicable
     bankruptcy, insolvency, reorganization, moratorium, fraudulent transfer and
     similar laws of general applicability relating to or affecting creditors'
     rights or by general equity principles).


                                     -26-
<PAGE>

          (f)       REGULATORY APPROVALS; NO DEFAULTS. (i) No consents or
     approvals of, or filings or registrations with, any court, administrative
     agency or commission or other governmental authority or instrumentality or
     with any third party are required to be made or obtained by Western or any
     of its Subsidiaries in connection with the execution, delivery or
     performance by either Western or Merger Sub of this Agreement or to
     consummate the Merger except for (A) the filing of applications and
     notices, as applicable, with the Regulatory Authorities; (B) approval of
     the listing on the Nasdaq of Western Common Stock to be issued in the
     Merger; (C) the filing and declaration of effectiveness of the Registration
     Statement; (D) the filing of an agreement of merger with the California
     Secretary pursuant to the CGCL; (E) filing of an agreement of merger with
     the Commissioner pursuant to the California Financial Code; (F) such
     filings as are required to be made or approvals as are required to be
     obtained under the securities or "Blue Sky" laws of various states in
     connection with the issuance of Western Common Stock in the Merger; and (F)
     receipt of the approvals set forth in Section 7.01(b).  As of the date
     hereof, Western is not aware of any reason why the approvals set forth in
     Section 7.01(b) will not be received without the imposition of a condition,
     restriction or requirement of the type described in Section 7.01(b).  

          (ii)      Subject to receipt of the regulatory approvals referred to
     in the preceding paragraph and expiration of the related waiting periods,
     and required filings under federal and state securities laws, the
     execution, delivery and performance of this Agreement and the consummation
     of the transactions contemplated hereby do not and will not (A) constitute
     a breach or violation of, or a default under, or give rise to any Lien, any
     acceleration of remedies or any right of termination under, any law, rule
     or regulation or any judgment, decree, order, governmental permit or
     license, or agreement, indenture or instrument of Western or of any of its
     Subsidiaries or to which Western or any of its Subsidiaries or properties
     is subject or bound, (B) constitute a breach or violation of, or a default
     under, the articles of incorporation or by-laws (or similar governing
     documents) of Western or any of its Subsidiaries, or (C) require any
     consent or approval under any such law, rule, regulation, judgment, decree,
     order, governmental permit or license, agreement, indenture or instrument.

          (g)       FINANCIAL REPORTS AND REGULATORY DOCUMENTS; MATERIAL ADVERSE
     EFFECT. (i) Western's Annual Report on Form 10-K for the fiscal year ended
     December 31, 1997 and all other reports, registration statements, or
     definitive proxy statements filed or to be filed by it or any of its
     Significant Subsidiaries subsequent to December 31, 1997 under the
     Securities Act, or under Sections 13(a), 13(d), 14 or 15(d) of the Exchange
     Act, in the form filed or to be filed (collectively, the "REGULATORY
     DOCUMENTS"), as of the date filed, (A) complied or will comply in all
     material respects as to form with the applicable requirements under the
     Securities Act or the Exchange Act, as the case may be, and (B) did not and
     will not contain any untrue statement of a material fact or omit to state a
     material fact required to be stated therein or necessary to make the
     statements therein, in the light of the circumstances under which they were
     made, not misleading; and each of the balance sheets contained in or


                                     -27-
<PAGE>

     incorporated by reference into any such Regulatory Document (including the
     related notes and schedules thereto) fairly presents, or will fairly
     present, the financial position of Western and its Subsidiaries as of its
     date, and each of the statements of income and changes in shareholders'
     equity and cash flows or equivalent statements in such Regulatory Documents
     (including any related notes and schedules thereto) fairly presents, or
     will fairly present, the results of operations, changes in shareholders'
     equity and changes in cash flows, as the case may be, of Western and its
     Subsidiaries for the periods to which they relate, in each case in
     accordance with GAAP consistently applied during the periods involved,
     except in each case as may be noted therein, subject to normal year-end
     audit adjustments in the case of unaudited statements.

          (ii)      Since December 31, 1997, no event has occurred or
     circumstance arisen that, individually or taken together with all other
     facts, circumstances and events (described in any paragraph of Section 5.04
     or otherwise), is reasonably likely to have a Material Adverse Effect with
     respect to it.

          (iii)     Western has timely filed all reports, registrations and
     statements, together with any amendments required to be made with respect
     thereto, that they were required to file since December 31, 1996 with the
     Regulatory Agencies, and all other material reports and statements required
     to be filed by it since December 31, 1996, including, without limitation,
     any report or statement required to be filed pursuant to the laws of the
     United States or the State of California and the rules and regulations of
     the Federal Reserve, the FDIC or the Commissioner, and has paid all fees
     and assessments due and payable in connection therewith.  As of their
     respective dates, such reports, registrations and statements complied in
     all material respects with all the laws, rules and regulations of the
     applicable Regulatory Agency with which they were filed.

          (h)       COMPLIANCE WITH LAWS.  Western and each of its Significant
     Subsidiaries: 

                    (i)  is in compliance with all applicable federal, state,
          local and foreign statutes, laws, regulations, ordinances, rules,
          judgments, orders or decrees applicable thereto or to the employees
          conducting such businesses, including, without limitation, the Equal
          Credit Opportunity Act, the Fair Housing Act, the Community
          Reinvestment Act, the Home Mortgage Disclosure Act and all other
          applicable fair lending laws and other laws relating to discriminatory
          business practices; 

               (ii) has all permits, licenses, authorizations, orders and
          approvals of, and has made all filings, applications and registrations
          with, all Governmental Authorities that are required in order to
          permit them to own or lease their properties and to conduct their
          businesses as presently conducted; all such permits, licenses,
          certificates of authority, orders and approvals are in full force and
          effect and, to Western's knowledge, no suspension or cancellation of
          any of them is threatened; and


                                     -28-
<PAGE>

               (iii)     has received, since December 31, 1995, no notification
          or communication from any Governmental Authority (A) asserting that
          Western or any of its Subsidiaries is not in compliance with any of
          the statutes, regulations or ordinances which such Governmental
          Authority enforces or (B) threatening to revoke any license,
          franchise, permit or governmental authorization (nor, to Western's
          knowledge, do any grounds for any of the foregoing exist).

          (i)       NO BROKERS.  No action has been taken by Western that would
     give rise to any valid claim against any party hereto for a brokerage
     commission, finder's fee or other like payment with respect to the
     transactions contemplated by this Agreement, excluding Previously
     Disclosed fees payable to Keefe, Bruyette & Woods, Inc. and Belle Plaine
     Partners, Inc.

          (j)       ACCOUNTING TREATMENT; TAX MATTERS.  As of the date hereof,
     Western is aware of no reason why the Merger will fail to qualify for
     "pooling-of-interests" accounting treatment.  As of the date hereof,
     neither Western nor any of its Subsidiaries has any reason to believe that
     any conditions exist that might prevent or impede the Merger from
     qualifying as a reorganization within the meaning of Section 368 of the
     Code.

          (k)       YEAR 2000 COMPLIANCE.  Except as Previously Disclosed, (i)
     Western's Computer System used for the storage and processing of data are
     or will be prior to the year 2000 Year 2000 Compliant; (ii) none of
     Western's Computer System, operations or business functions of Western will
     be materially adversely affected by any third party's failure to be Year
     2000 Compliant; to the best of Western's knowledge after due inquiry, all
     of its suppliers, customers and third party providers are, or will be prior
     to year 2000, Year 2000 Compliant; and (iii) Western is taking or has
     taken, all necessary and appropriate action to address and remedy any
     deficiencies in its Computer System which would keep it from becoming Year
     2000 Compliant.  

          (l)       LITIGATION.  Other than as set forth in Western's Regulatory
     Documents filed on or before the date hereof, no litigation, claim or other
     proceeding before any court or governmental agency is pending against
     Western or any of its Significant Subsidiaries and, to Western's knowledge,
     no such litigation, claim or other proceeding has been threatened.


                                   ARTICLE VI

                                   COVENANTS

          6.01  REASONABLE BEST EFFORTS.   Subject to the terms and conditions 
of this Agreement, each of Peninsula, Western and Merger Sub agrees to cooperate
with the other parties hereto and


                                      29
<PAGE>

to use its reasonable best efforts in good faith to take, or cause to be taken, 
all actions, and to do, or cause to be done, all things necessary, proper or 
desirable, or advisable under applicable laws, so as to permit consummation of 
the Merger as promptly as practicable and otherwise to enable consummation of 
the transactions contemplated hereby and shall cooperate fully with the other 
party hereto to that end.

          6.02  SHAREHOLDER APPROVAL.  Peninsula agrees to take, in accordance
with applicable law and the Peninsula Articles and the Peninsula By-Laws, all
action necessary to convene an appropriate meeting of its shareholders to
consider and vote upon the approval and adoption of this Agreement and any other
matters required to be approved by Peninsula's shareholders for consummation of
the Merger (including any adjournment or postponement, the "PENINSULA MEETING"),
in each case as promptly as practicable after the Registration Statement is
declared effective.  Except to the extent legally required for the discharge by
the Peninsula Board of its fiduciary duties as advised by counsel to the
Peninsula Board, the Peninsula Board shall recommend such approval, and
Peninsula shall take all reasonable, lawful action to solicit such approval by
its shareholders.

          6.03  REGISTRATION STATEMENT.  (a) Western agrees to prepare a
registration statement on Form S-4 or other applicable form (the "REGISTRATION
STATEMENT") to be filed by Western with the SEC in connection with the issuance
of Western Common Stock in the Merger (including the proxy statement and
prospectus and other proxy solicitation materials of Peninsula constituting a
part thereof (the "PROXY STATEMENT") and all related documents).  Peninsula
shall have the right to review such Registration Statement and Peninsula agrees
to cooperate, and to cause its Subsidiaries to cooperate, with Western, its
counsel and its accountants, in preparation of the Registration Statement and
the Proxy Statement.  Peninsula agrees to file the Proxy Statement in
preliminary form with such of the Regulatory Authorities as may be required as
soon as reasonably practicable, and Western agrees to file the Registration
Statement with the SEC as soon as reasonably practicable.  Each of Peninsula and
Western agrees to use all reasonable efforts to cause the Registration Statement
to be declared effective under the Securities Act as promptly as reasonably
practicable after filing thereof.  Western also agrees to use all reasonable
efforts to obtain all necessary state securities law or "Blue Sky" permits and
approvals required to carry out the transactions contemplated by this Agreement.
Peninsula agrees to furnish to Western all information concerning Peninsula, its
Subsidiaries, officers, directors and shareholders as may be reasonably
requested in connection with the foregoing.

          (b)       Each of Peninsula and Western agrees, as to itself and its
Subsidiaries, that none of the information supplied or to be supplied by it for
inclusion or incorporation by reference in (i) the Registration Statement will,
at the time the Registration Statement and each amendment or supplement thereto,
if any, becomes effective under the Securities Act, contain any untrue statement
of a material fact or omit to state any material fact required to be stated
therein or necessary to make the statements therein not misleading, and (ii) the
Proxy Statement and any


                                     -30-
<PAGE>

amendment or supplement thereto will, at the date of mailing to shareholders 
and at the time of the Peninsula Meeting, contain any untrue statement of a 
material fact or omit to state any material fact required to be stated therein 
or necessary to make the statements therein not misleading or any statement 
which, in the light of the circumstances under which such statement is made, 
will be false or misleading with respect to any material fact, or which will 
omit to state any material fact necessary in order to make the statements 
therein not false or misleading or necessary to correct any statement in any 
earlier statement in the Proxy Statement or any amendment or supplement 
thereto.  Each of Peninsula and Western further agrees that if it shall become 
aware prior to the Effective Date of any information furnished by it that would 
cause any of the statements in the Proxy Statement to be false or misleading 
with respect to any material fact, or to omit to state any material fact 
necessary to make the statements therein not false or misleading, promptly to 
inform the other party thereof and to take the necessary steps to correct the 
Proxy Statement.

          (c)       Western agrees to advise Peninsula, promptly after Western
receives notice thereof, of the time when the Registration Statement has become
effective or any supplement or amendment has been filed, of the issuance of any
stop order or the suspension of the qualification of Western Common Stock for
offering or sale in any jurisdiction, of the initiation or threat of any
proceeding for any such purpose, or of any request by the SEC for the amendment
or supplement of the Registration Statement or for additional information.

          6.04  PRESS RELEASES.  Each of Peninsula and Western agrees that it
will not, without the prior approval of the other party, issue any press release
or written statement for general circulation relating to the transactions
contemplated hereby, except as otherwise required by applicable law or
regulation or Nasdaq rules (provided that the issuing party shall nevertheless
provide the other party with notice of, and the opportunity to review, any such
press release or written statement).

          6.05  ACCESS; INFORMATION.  (a) Each of Peninsula and Western agrees
that upon reasonable notice and subject to applicable laws relating to the
exchange of information, each party shall afford the other party and the other
party's officers, employees, counsel, accountants and other authorized
representatives, such access during normal business hours throughout the period
prior to the Effective Time to the books, records (including, without
limitation, tax returns and work papers of independent auditors), properties,
personnel and to such other information as the requesting party may reasonably
request and, during such period, the providing party shall furnish promptly to
the requesting party (i) a copy of each material report, schedule and other
document filed by it pursuant to the requirements of federal or state securities
or banking laws, and (ii) all other information concerning the business,
properties and personnel of it as the requesting party may reasonably request.


                                     -31-
<PAGE>

          (b)       Each party agrees that it will not, and will cause its
representatives not to, use any information obtained pursuant to this Section
6.05 (as well as any other information obtained prior to the date hereof in
connection with the entering into of this Agreement) for any purpose unrelated
to the consummation of the transactions contemplated by this Agreement.  Subject
to the requirements of law, each party will keep confidential, and will cause
its representatives to keep confidential, all information and documents obtained
pursuant to this Section 6.05 (as well as any other information obtained prior
to the date hereof in connection with the entering into of this Agreement)
unless such information (i) was already known to such party, (ii) becomes
available to such party from other sources not known by such party to be bound
by a confidentiality obligation, (iii) is disclosed with the prior written
approval of the providing party or (iv) is or becomes readily ascertainable from
published information or trade sources.  In the event that this Agreement is
terminated or the transactions contemplated by this Agreement shall otherwise
fail to be consummated, each party shall promptly cause all copies of documents
or extracts thereof containing information and data as to the other party to be
returned to the other party.  No investigation by either party of the business
and affairs of the other party shall affect or be deemed to modify or waive any
representation, warranty, covenant or agreement in this Agreement, or the
conditions to either party's obligation to consummate the transactions
contemplated by this Agreement.

          6.06  ACQUISITION PROPOSALS.  Peninsula agrees that it shall not, and
shall cause its Subsidiaries and its Subsidiaries' officers, directors, agents,
advisors and affiliates not to, solicit or encourage inquiries or proposals with
respect to, or engage in any negotiations concerning, or provide any
confidential information to, or have any discussions with, any person relating
to, any Acquisition Proposal, except to the extent legally required for the
discharge by the Peninsula Board of its fiduciary duties as advised by counsel
to the Peninsula Board.  Peninsula shall immediately cease and cause to be
terminated any activities, discussions or negotiations conducted prior to the
date of this Agreement with any parties other than Western with respect to any
of the foregoing and shall use its reasonable best efforts to enforce any
confidentiality or similar agreement relating to an Acquisition Proposal. 
Peninsula shall promptly (within 24 hours) advise Western following the receipt
by Peninsula of any Acquisition Proposal and the substance thereof (including
the identity of the person making such Acquisition Proposal), and advise Western
of any developments with respect to such Acquisition Proposal immediately upon
the occurrence thereof.

          6.07  AFFILIATE AGREEMENTS.  (a) Not later than the 15th day prior to
the mailing of the Proxy Statement, Peninsula shall deliver to Western a
schedule of each person that, to the best of its knowledge, is or is reasonably
likely to be, as of the date of the Peninsula Meeting, deemed to be an
"affiliate" of Peninsula (each, a "PENINSULA AFFILIATE") as that term is used in
Rule 145 under the Securities Act or SEC Accounting Series Releases 130 and 135.


                                     -32-
<PAGE>

          (b)       Peninsula shall use its reasonable best efforts to cause
each person who may be deemed to be a Peninsula Affiliate to execute and deliver
to Western on or before the date of mailing of the Proxy Statement an agreement
in the form attached hereto as EXHIBIT A.

          6.08  BOARD ATTENDANCE.  John G. Rebelo, Jr. or in his absence another
representative of Peninsula selected by him, shall be invited by Western to
attend all regular and special meetings of the Western Board and the Executive
Committee of the Western Board from the date hereof until the Effective Date. 
Western shall, to the extent reasonably practicable, inform Peninsula of each
such meeting at least two business days in advance of each such meeting;
PROVIDED, HOWEVER, that the attendance of John G. Rebelo, Jr. shall not be
permitted at any meeting, or portion thereof, for the purpose of discussing
transactions contemplated by this Agreement or the obligations of Western or
Merger Sub under this Agreement.  Matthew P. Wagner or in his absence another
representative of Peninsula selected by him, shall be invited by Peninsula to
attend all regular and special meetings of the Peninsula Board and the Executive
Committee of the Peninsula Board from the date hereof until the Effective Date. 
Peninsula shall, to the extent reasonably practicable, inform Western of each
such meeting at least two business days in advance of each such meeting;
PROVIDED, HOWEVER, that the attendance of Matthew P. Wagner shall not be
permitted at any meeting, or portion thereof, for the purpose of discussing
transactions contemplated by this Agreement or the obligations of Western under
this Agreement. 

          6.09  CERTAIN POLICIES.  On or after the Regulatory Approval Date,
Peninsula shall, consistent with GAAP and on a basis mutually satisfactory to it
and Western, modify and change its loan, litigation and real estate valuation
policies and practices (including loan classifications and levels of reserves)
so as to be applied on a basis that is consistent with that of Western.

          6.10 NASDAQ LISTING.  Western agrees to use its reasonable best
efforts to list, prior to the Effective Date, on the Nasdaq, subject to official
notice of issuance, the shares of Western Common Stock to be issued to the
holders of Peninsula Common Stock in the Merger.

          6.11 REGULATORY APPLICATIONS.  (a) Western and Peninsula and their
respective Subsidiaries shall cooperate and use their respective reasonable best
efforts to prepare all documentation, to effect all filings and to obtain all
permits, consents, approvals and authorizations of all third parties and
Governmental Authorities necessary to consummate the transactions contemplated
by this Agreement.  Western and Peninsula shall use their reasonable best
efforts to make all required bank regulatory filings, including the appropriate
filing with the Regulatory Authorities.  Each of Western and Peninsula shall
have the right to review in advance, and to the extent practicable each will
consult with the other, in each case subject to applicable laws relating to the
exchange of information, with respect to all material written information
submitted to any third party or any Governmental Authority in connection with
the transactions contemplated by this Agreement.  In exercising the foregoing
right, each of the


                                     -33-
<PAGE>

parties hereto agrees to act reasonably and as promptly as practicable.  Each 
party hereto agrees that it will consult with the other party hereto with 
respect to the obtaining of all material permits, consents, approvals and 
authorizations of all third parties and Governmental Authorities necessary or 
advisable to consummate the transactions contemplated by this Agreement and 
each party will keep the other party appraised of the status of material 
matters relating to completion of the transactions contemplated hereby.

          (b)       Each party agrees, upon request, to furnish the other party
with all information concerning itself, its Subsidiaries, directors, officers
and shareholders and such other matters as may be reasonably necessary or
advisable in connection with any filing, notice or application made by or on
behalf of such other party or any of its Subsidiaries to any third party or
Governmental Authority.

          6.12 INDEMNIFICATION; DIRECTOR AND OFFICERS' INSURANCE.  (a) From and
after the Effective Time through the sixth anniversary of the Effective Date,
Western agrees to indemnify and hold harmless each present and former director
and officer of Peninsula or any Subsidiary of Peninsula determined as of the
Effective Time (the "INDEMNIFIED PARTIES"), against any costs or expenses
(including reasonable attorneys' fees), judgments, fines, losses, claims,
damages or liabilities (collectively, "COSTS") incurred in connection with any
claim, action, suit, proceeding or investigation, whether civil, criminal,
administrative or investigative, arising out of matters existing or occurring at
or prior to the Effective Time (including with respect to this Agreement or any
of the transactions contemplated hereby) (but excluding any Costs arising out of
any violation or alleged violation of the Exchange Act or the rules and
regulations thereunder with respect to insider trading), whether asserted,
claimed or arising prior to, at or after the Effective Time, to the extent to
which such Indemnified Parties were entitled under California law and the
Peninsula Articles or the Peninsula By-Laws in effect on the date hereof, and
Western shall also advance expenses as incurred to the extent permitted under
California law and the Peninsula Articles and the Peninsula By-Laws.

          (b)       Any Indemnified Party wishing to claim indemnification under
Section 6.12(a), upon learning of any such claim, action, suit, proceeding or
investigation, shall as promptly as possible notify Western thereof, but the
failure to so notify shall not relieve Western of any liability it may have to
such Indemnified Party if such failure does not materially prejudice Western. 
In the event of any such claim, action, suit, proceeding or investigation
(whether arising before or after the Effective Time), (i) Western shall have the
right to assume the defense thereof and Western shall not be liable to such
Indemnified Parties for any legal expenses of other counsel or any other
expenses subsequently incurred by such Indemnified Parties in connection with
the defense thereof, except that if Western elects not to assume such defense or
counsel for the Indemnified Parties advises in writing that there are issues
which raise conflicts of interest between Western and the Indemnified Parties,
the Indemnified Parties may retain counsel satisfactory to them, and Western
shall pay the reasonable fees and expenses of one such


                                     -34-
<PAGE>

counsel for the Indemnified Parties in any jurisdiction promptly as statements 
thereof are received, (ii) the Indemnified Parties will cooperate in the 
defense of any such matter and (iii) Western shall not be liable for any 
settlement effected without its prior written consent (which consent shall not 
be unreasonably withheld); and PROVIDED, FURTHER, that Western shall not have 
any obligation hereunder to any Indemnified Party when and if a court of 
competent jurisdiction shall ultimately determine, and such determination shall 
have become final and nonappealable, that the indemnification of such 
Indemnified Party in the manner contemplated hereby is not permitted or is 
prohibited by applicable law.

          (c)       For a period of six years after the Effective Time, Western
shall use its reasonable best efforts to cause to be maintained in effect the
current policies of directors' and officers' liability insurance maintained by
Peninsula (provided that Western may substitute therefor policies of comparable
coverage with respect to claims arising from facts or events which occurred
before the Effective Time); PROVIDED, HOWEVER, that in no event shall Western be
obligated to expend, in order to maintain or provide insurance coverage pursuant
to this Section 6.12(c), any amount per annum in excess of 125% of the amount of
the annual premiums paid as of the date hereof by Peninsula for such insurance
(the "MAXIMUM AMOUNT").  If the amount of the annual premiums necessary to
maintain or procure such insurance coverage exceeds the Maximum Amount, Western
shall use all reasonable efforts to maintain the most advantageous policies of
directors' and officers' insurance obtainable for an annual premium equal to the
Maximum Amount.  Notwithstanding the foregoing, prior to the Effective Time,
Western may request Peninsula to, and Peninsula shall, purchase insurance
coverage, on such terms and conditions as shall be acceptable to Western,
extending for a period of six years Peninsula's directors' and officers'
liability insurance coverage in effect as of the date hereof (covering past or
future claims with respect to periods before the Effective Time) and such
coverage shall satisfy Western's obligations under this Subsection (c).

          (d)       If Western or any of its successors or assigns (i) shall
consolidate with or merge into any other corporation or entity and shall not be
the continuing or surviving corporation or entity of such consolidation or
merger or (ii) shall transfer all or substantially all of its properties and
assets to any individual, corporation or other entity, then and in each such
case, proper provision shall be made so that the successors and assigns of
Western shall assume the obligations set forth in this Section 6.12

          6.13 BENEFIT PLAN.  Western shall, from and after the Effective Time,
(i) provide former employees of Peninsula who remain as employees of Western or
any of its Significant Subsidiaries with employee benefit plans no less
favorable in the aggregate than those provided to similarly situated employees
of Western or its Significant Subsidiaries, including, but not limited to,
allowing such employees to participate in Western's stock option plan in
accordance with the policies of Western with respect to such stock option plan,
and (ii) with respect to former employees of Peninsula who remain as employees
of Western or any of its Significant


                                     -35-
<PAGE>

Subsidiaries, cause each employee benefit plan of Western or its Significant 
Subsidiaries in which such employees are eligible to participate to take into 
account for purposes of eligibility and vesting thereunder the service of such 
employees with Peninsula as if such service were with Western or its 
Significant Subsidiaries, to the same extent such service was credited under a 
comparable plan of Peninsula.  Western agrees that all accrued bonuses for 1998 
will be paid to former employees of Peninsula in accordance with Peninsula's 
past practices.  Notwithstanding the foregoing, Peninsula consents and 
covenants that from and after the Effective Date, Peninsula's Benefit Plans 
will be governed, managed and/or terminated by Western, all within Western's 
sole discretion.

          6.14 ACCOUNTANTS' LETTERS.  Each of Peninsula and Western shall use
its reasonable best efforts to cause to be delivered to the other party, and to
Western's directors and officers who sign the Registration Statement, a letter
of their respective independent auditors, dated (i) the date on which the
Registration Statement shall become effective and (ii) a date shortly prior to
the Effective Date, and addressed to such other party, and such directors and
officers, in form and substance customary for "comfort" letters delivered by
independent accountants in accordance with Statement of Accounting Standards No.
72.

          6.15 NOTIFICATION OF CERTAIN MATTERS.  Each of Peninsula and Western
shall give prompt notice to the other of any fact, event or circumstance known
to it that (i) is reasonably likely, individually or taken together with all
other facts, events and circumstances known to it, to result in any Material
Adverse Effect with respect to it or (ii) would cause or constitute a material
breach of any of its representations, warranties, covenants or agreements
contained herein.

          6.16 SHAREHOLDER AGREEMENTS.  Certain directors and certain officers
who are shareholders of Peninsula, in their capacities as shareholders, in
exchange for good and valuable consideration, have executed and delivered to
Western shareholder agreements substantially in the form of EXHIBIT B hereto and
EXHIBIT C hereto (the "SHAREHOLDER AGREEMENTS"), committing such persons, among
other things, (i) to vote their shares of Peninsula Common Stock in favor of the
Agreement at the Peninsula Meeting and (ii) to certain representations
concerning the ownership of Peninsula Common Stock and Western Common Stock to
be received in the Merger.

          6.17 PENINSULA NAME.  Except as set forth in the proviso to this
Section 6.17, for a period of two years following the Effective Date, Western
agrees to operate the business currently operated by Peninsula as a separate
division or business unit under the name of Peninsula; PROVIDED, HOWEVER, that
this covenant shall terminate automatically upon Western's merger, acquisition
or consolidation with, by or into any other Person.


                                     -36-
<PAGE>

          6.18 EMPLOYEE AGREEMENTS.  Peninsula will use its reasonable best
efforts to enter into employment agreements with each of John G. Rebelo, Jr.,
Larry L. Willette, Barbara Hosaka and Lawrence G. Alameda, (together the
"Executives"), on terms and conditions mutually satisfactory to Western and the
Executives.  Negotiations with respect to such agreements shall commence not
later than 30 calendar days after the date hereof and shall be concluded as soon
thereafter as practicable and in any event not later than 60 calendar days after
the date hereof.  In the event that any of the Executives do not enter into the
employment agreements contemplated by this Section 6.18, then such Executive's
existing employment agreement shall govern.  Western acknowledges and agrees
that after the consummation of the Merger, the Surviving Corporation will
continue to be obligated to perform its obligations under the employment
agreements and the supplemental executive retirement pay agreements with each
such Executive.  In accordance with the respective terms thereof, including the
provisions relating to a Change in Control as defined therein, except as such
existing employment agreements are modified in the letter agreement executed by
each of the Executives on the date hereof.


                                  ARTICLE VII

                    CONDITIONS TO CONSUMMATION OF THE MERGER

          7.01  CONDITIONS TO EACH PARTY'S OBLIGATION TO EFFECT THE MERGER.  The
respective obligation of each of Western and Peninsula to consummate the Merger
is subject to the fulfillment or written waiver by Western and Peninsula prior
to the Effective Time of each of the following conditions:

          (a)       SHAREHOLDER APPROVAL.  This Agreement and the Merger shall
     have been duly adopted by the requisite vote of the shareholders of
     Peninsula.

          (b)       REGULATORY APPROVALS.  All regulatory approvals or waivers
     required to consummate the transactions contemplated hereby shall have been
     obtained and shall remain in full force and effect and all statutory
     waiting periods in respect thereof shall have expired and no such approvals
     or waivers shall contain any conditions, restrictions or requirements which
     the Western Board reasonably determines would (i) following the Effective
     Time, have a Material Adverse Effect on the Surviving Corporation and its
     Subsidiaries taken as a whole or (ii) reduce the benefits of the
     transactions contemplated hereby to such a degree that Western would not
     have entered into this Agreement had such conditions, restrictions or
     requirements been known at the date hereof.  

          (c)       NO INJUNCTION.  No Governmental Authority of competent
     jurisdiction shall have enacted, issued, promulgated, enforced or entered
     any statute, rule, regulation, judgment,


                                     -37-
<PAGE>

     decree, injunction or other order (whether temporary, preliminary or 
     permanent) which is in effect and prohibits consummation of the 
     transactions contemplated by this Agreement.

          (d)       REGISTRATION STATEMENT.  The Registration Statement shall
     have become effective under the Securities Act and no stop order suspending
     the effectiveness of the Registration Statement shall have been issued and
     no proceedings for that purpose shall have been initiated or threatened by
     the SEC.

          (e)       BLUE SKY APPROVALS.  All permits and other authorizations
     under state securities laws necessary to consummate the transactions
     contemplated hereby and to issue the shares of Western Common Stock to be
     issued in the Merger shall have been received and be in full force and
     effect.

          (f)       LISTING.  The shares of Western Common Stock to be issued in
     the Merger shall have been approved for listing on the Nasdaq, subject to
     official notice of issuance.

          7.02  CONDITIONS TO OBLIGATION OF PENINSULA.  The obligation of
Peninsula to consummate the Merger is also subject to the fulfillment or written
waiver by Peninsula prior to the Effective Time of each of the following
conditions:

          (a)       REPRESENTATIONS AND WARRANTIES.  The representations and
     warranties of Western set forth in this Agreement (subject to the standard
     set forth in Section 5.02) shall be true and correct as of the date of this
     Agreement and as of the Effective Date as though made on and as of the
     Effective Date (except that representations and warranties that by their
     terms speak only as of the date of this Agreement or some other date shall
     be true and correct as of such date), and Peninsula shall have received a
     certificate, dated the Effective Date, signed on behalf of Western by the
     Chief Executive Officer and the Chief Financial Officer of Western to such
     effect.

          (b)       PERFORMANCE OF OBLIGATIONS OF WESTERN.  Western shall have
     performed in all material respects all obligations required to be performed
     by it under this Agreement at or prior to the Effective Time, and Peninsula
     shall have received a certificate, dated the Effective Date, signed on
     behalf of Western by the Chief Executive Officer and the Chief Financial
     Officer of Western to such effect.

          (c)       TAX OPINION.  Peninsula shall have received an opinion of
     Deloitte & Touche LLP, dated the Effective Date, to the effect that, on the
     basis of facts, representations and assumptions set forth in such opinion,
     (i) the Merger constitutes a "reorganization" within the meaning of
     Section 368 of the Code and (ii) no gain or loss will be recognized by
     shareholders of Peninsula who receive shares of Western Common Stock in
     exchange for shares of Peninsula Common Stock, except with respect to cash
     received in lieu of fractional


                                     -38-
<PAGE>

     share interests.  In rendering its opinion, Deloitte & Touche LLP may 
     require and rely upon representations contained in letters from Peninsula, 
     Western and shareholders of Peninsula.

          (d)       ACCOUNTANTS' LETTERS.  Peninsula shall have received the
     letters referred to in Section 6.14 from Western's independent auditors.

          (e)       ACCOUNTING TREATMENT.  Peninsula shall have received from
     Peninsula's independent auditors, letters, dated the date of or shortly
     prior to each of the mailing date of the Proxy Statement and the Effective
     Date, stating its opinion that the Merger shall qualify for 
     pooling-of-interests accounting treatment.

          (f)  DIRECTOR.  Western shall have adopted resolutions sufficient to
     appoint John G. Rebelo, Jr. as a director of Western as of the Effective
     Time and shall have caused John G. Rebelo, Jr. to be appointed as a
     director of Peninsula as of the Effective Time, or if such person is unable
     to serve, such other current director of Peninsula as shall be mutually
     satisfactory to Western and Peninsula.

          (g)  FAIRNESS OPINION.  Peninsula shall have received the written
     opinion of NationsBanc Montgomery Securities LLC to the effect that, as of
     a date within five days of the mailing of the Proxy Statement to the
     shareholders of Peninsula in connection with the Peninsula Meeting, the
     consideration to be received by the holders of the Peninsula Company Stock
     in the Merger is fair to the holders of the Peninsula Common Stock from a
     financial point of view.

          7.03  CONDITIONS TO OBLIGATION OF WESTERN.  The obligation of Western
to consummate the Merger is also subject to the fulfillment or written waiver by
Western prior to the Effective Time of each of the following conditions:

          (a)       REPRESENTATIONS AND WARRANTIES.  The representations and
     warranties of Peninsula set forth in this Agreement (subject to the
     standard set forth in Section 5.02) shall be true and correct as of the
     date of this Agreement and as of the Effective Date as though made on and
     as of the Effective Date (except that representations and warranties that
     by their terms speak only as of the date of this Agreement or some other
     date shall be true and correct as of such date) and Western shall have
     received a certificate, dated the Effective Date, signed on behalf of
     Peninsula by the Chief Executive Officer and the Chief [Financial] Officer
     of Peninsula to such effect.

          (b)       PERFORMANCE OF OBLIGATIONS OF PENINSULA.  Peninsula shall
     have performed in all material respects all obligations required to be
     performed by it under this Agreement at or prior to the Effective Time, and
     Western shall have received a certificate, dated the Effective


                                     -39-
<PAGE>

     Date, signed on behalf of Peninsula by the Chief Executive Officer and the 
     Chief Financial Officer of Peninsula to such effect.

          (c)       OPINION OF WESTERN'S COUNSEL.  Western shall have received
     an opinion of Sullivan & Cromwell, special counsel to Western, dated the
     Effective Date, to the effect that, on the basis of facts, representations
     and assumptions set forth in such opinion, the Merger constitutes a
     reorganization under Section 368 of the Code.  In rendering its opinion,
     Sullivan & Cromwell may require and rely upon representations contained in
     letters from Peninsula, Western and shareholders of Peninsula.

          (d)       ACCOUNTANTS' LETTERS.  Western shall have received the
     letters referred to in Section 6.14 from Peninsula's independent auditors.

          (e)       ACCOUNTING TREATMENT.  Western shall have received from KPMG
     Peat Marwick LLP, Western's independent auditors, letters, dated the date
     of or shortly prior to each of the mailing date of the Proxy Statement and
     the Effective Date, stating its opinion that the Merger shall qualify for
     pooling-of-interests accounting treatment.

          (f)  PENINSULA FINANCIAL TESTS.  As of the month end preceding the
     Effective Time, but without giving effect to any costs related to the
     Merger or any changes effected as a result of Section 6.09, Peninsula's
     shareholders' equity and allowance for credit losses shall not be less than
     the respective amounts set forth on Peninsula's call report as of June 30,
     1998, and Western shall have received a certificate, dated the Effective
     Date, signed on behalf of Peninsula by its Chief Financial Officer to such
     effect.

          (g)  DIRECTOR RESIGNATIONS.  Western shall have received the written
     resignation of each director (in such director's capacity as director) of
     Peninsula, effective as of the Effective Time.


                                  ARTICLE VIII

                                  TERMINATION

          8.01  TERMINATION.  This Agreement may be terminated, and the Merger
may be abandoned:

          (a)       MUTUAL CONSENT.  At any time prior to the Effective Time, by
     the mutual consent of Western and Peninsula, if the Board of Directors of
     each so determines by vote of a majority of the members of its entire
     Board.


                                     -40-
<PAGE>

          (b)       BREACH.  At any time prior to the Effective Time, by Western
     or Peninsula, if its Board of Directors so determines by vote of a majority
     of the members of its entire Board, in the event of either: (i) a breach by
     the other party of any representation or warranty contained herein (subject
     to the standard set forth in Section 5.02), which breach cannot be or has
     not been cured within 30 days after the giving of written notice to the
     breaching party of such breach; or (ii) a breach by the other party of any
     of the covenants or agreements contained herein, which breach cannot be or
     has not been cured within 30 days after the giving of written notice to the
     breaching party of such breach, provided that such breach (whether under
     (i) or (ii)) would be reasonably likely, individually or in the aggregate
     with other breaches, to result in a Material Adverse Effect.

          (c)       DELAY.  At any time prior to the Effective Time, by Western
     or Peninsula, if its Board of Directors so determines by vote of a majority
     of the members of its entire Board, in the event that the Merger is not
     consummated by March 31, 1999, except to the extent that the failure of the
     Merger then to be consummated arises out of or results from the knowing
     action or inaction of the party seeking to terminate pursuant to this
     Section 8.01(c).

          (d)       NO APPROVAL.  By Peninsula or Western, if its Board of
     Directors so determines by a vote of a majority of the members of its
     entire Board, in the event (i) the approval of any Governmental Authority
     required for consummation of the Merger and the other transactions
     contemplated by this Agreement shall have been denied by final
     nonappealable action of such Governmental Authority or (ii) the shareholder
     approval required by Section 7.01(a) herein is not obtained at the
     Peninsula Meeting.

          (e)       FAILURE TO RECOMMEND, ETC.  At any time prior to the
     Peninsula Meeting, by Western if the Peninsula Board shall have failed to
     make its recommendation referred to in Section 6.02, withdrawn such
     recommendation or modified or changed such recommendation in a manner
     adverse in any respect to the interests of Western.

          (f)       WESTERN STOCK.  By Peninsula in the event that, with respect
     to any Ten Day Period (as defined below) both (i) (A) the Ten Day Average
     Price (as defined below) shall be less than $36.656 per share and (B) the
     Western Common Stock Price Percentage (as defined below) shall be less than
     the BKX Index Percentage (as defined below) and (ii) Peninsula has
     delivered written notice to Western of its intention to terminate this
     Agreement within forty-eight (48) hours following the date of such event
     (it being understood that, if an event set forth in clause (i) shall have
     occurred and Peninsula fails to timely deliver the notice referred to in
     this clause (ii), Peninsula shall have the right to terminate if any such
     event subsequently occurs and Peninsula timely delivers such notice);
     PROVIDED, HOWEVER, that, if Western effects a stock dividend,
     reclassification, recapitalization, stock split, combination, exchange of
     shares or similar transaction after the date hereof and prior to the
     Effective Time, the provisions of this Section 8.01(f) shall be
     appropriately adjusted.


                                     -41-
<PAGE>

          As used in this Section 8.01(f), (v) "WESTERN COMMON STOCK PRICE
     PERCENTAGE" means the percentage determined by dividing the Ten Day Average
     Price by $43.125 (as such amount may be adjusted pursuant to this clause
     (f)); (w) "BKX INDEX PERCENTAGE" means the percentage determined by
     dividing (i) the product of (A) the Ten Day Average Keefe Bank Index times
     (B) 0.9 by (ii) the Keefe Bank Index as of the date hereof; (x) "TEN DAY
     AVERAGE PRICE" means the volume weighted average sales price per share of
     Western Common Stock for a Ten Day Period, which volume weighted average
     shall be determined in a manner consistent with Section 3.01(a) hereof; (y)
     "TEN DAY AVERAGE KEEFE BANK INDEX" means the average of the Keefe Bank
     Index for a Ten Day Period; and (z) "TEN DAY PERIOD" means any period of
     ten (10) consecutive Trading Days occurring after the date hereof.

          (g)       ACQUISITION PROPOSAL.  This Agreement may be terminated by
     Peninsula by written notice to Western if Peninsula (i) receives an
     Acquisition Proposal, (ii) receives the advice of its outside counsel that
     to proceed with the Merger will violate the fiduciary duties of the
     Peninsula Board to Peninsula's shareholders in light of such Acquisition
     Proposal and (iii) after receiving such advice, determines to accept such
     proposal; PROVIDED, HOWEVER, that Peninsula shall not be entitled to
     terminate this Agreement pursuant to this Section 8.01(g) unless it shall
     have provided Western with written notice of such a possible determination
     (which written notice will inform Western of the material terms and
     conditions of the proposal, including the identity of the proponent) not
     less than two business days prior to such determination.

          8.02  EFFECT OF TERMINATION AND ABANDONMENT.  In the event of
termination of this Agreement and the abandonment of the Merger pursuant to this
Article VIII, no party to this Agreement shall have any liability or further
obligation to any other party hereunder except (i) as set forth in Section 8.03
or Section 9.01 and (ii) that termination will not relieve a breaching party
from liability for any willful breach of this Agreement giving rise to such
termination.

          8.03  TERMINATION FEE.

          (a)   MATERIAL BREACH BY WESTERN.  Should Peninsula terminate this
     Agreement pursuant to Section 8.01(b) (unless such breach under Section
     8.01(b) shall result from no act or omission of Western), Western shall
     promptly, if so requested by Peninsula, but in no event later than five
     business days after the date of such request, pay Peninsula a fee equal to
     Peninsula's out-of-pocket expenses in connection with this Agreement and
     the transactions contemplated hereby, up to a maximum of $500,000, which
     amount shall be payable in same day funds, provided however that no fee
     shall be paid pursuant to this Section 8.03(a) if Peninsula shall be in
     material breach of its obligations hereunder and Western shall owe no
     further duty or liability on account of this Agreement to Peninsula. 


                                     -42-
<PAGE>

          (b)   MATERIAL BREACH BY PENINSULA; ENTERING ACQUISITION PROPOSAL. 
     Should Western terminate this Agreement pursuant to either Section 8.01(e)
     or 8.01(b) (unless such breach under Section 8.01(b) shall result from no
     act or omission of Peninsula), Peninsula shall promptly, if so requested by
     Western, but in no event later than five business days after the date of
     such request, pay Western a fee equal to Western's out-of-pocket expenses
     in connection with this Agreement and the transactions contemplated hereby,
     up to a maximum of $500,000, which amount shall be payable in same day
     funds, provided however that no fee shall be paid pursuant to this Section
     8.03 if Western shall be in material breach of its obligations hereunder
     and Peninsula shall owe no further duty or liability on account of this
     Agreement to Western.  In the event that there is a termination as a result
     of Peninsula entering into an Acquisition Proposal pursuant to Section
     8.01(g), Peninsula shall pay Western up to $500,000 to cover out-of-pocket
     expenses in addition to Western's rights under the Stock Option Agreement
     and Peninsula shall owe no further duty or liability on account of this
     Agreement to Western except under the Stock Option Agreement.


                                   ARTICLE IX

                                 MISCELLANEOUS

          9.01  SURVIVAL.  No representations, warranties, agreements and
covenants contained in this Agreement shall survive the Effective Time (other
than Sections 6.12 and 6.13 and this Article IX which shall survive the
Effective Time) or the termination of this Agreement if this Agreement is
terminated prior to the Effective Time (other than Sections 6.03(b), 6.05(b),
8.02, 8.03 and this Article IX which shall survive such termination).

          9.02  WAIVER; AMENDMENT.  Prior to the Effective Time, any provision 
of this Agreement may be (i) waived by the party benefitted by the provision, 
or (ii) amended or modified at any time, by an agreement in writing between the
parties hereto executed in the same manner as this Agreement, except that after
the Peninsula Meeting, this Agreement may not be amended if it would violate the
CGCL or reduce the consideration to be received by Peninsula shareholders in the
Merger.

          9.03  COUNTERPARTS.  This Agreement may be executed in one or more
counterparts, each of which shall be deemed to constitute an original.

          9.04  GOVERNING LAW; WAIVER OF JURY TRIAL.  This Agreement shall be
governed by, and interpreted in accordance with, the laws of the State of
California applicable to contracts made and to be performed entirely within such
State (except to the extent that mandatory provisions of Federal law are
applicable).  Each of the parties hereto hereby irrevocably waives any and all


                                     -43-
<PAGE>

right to trial by jury in any legal proceeding arising out of or related to this
Agreement or the transactions contemplated hereby.

          9.05  EXPENSES.  Each party hereto will bear all expenses incurred by
it in connection with this Agreement and the transactions contemplated hereby.

          9.06  NOTICES.  All notices, requests and other communications
hereunder to a party shall be in writing and shall be deemed given if personally
delivered, telecopied (with confirmation) or mailed by registered or certified
mail (return receipt requested) to such party at its address set forth below or
such other address as such party may specify by notice to the parties hereto.

                If to Peninsula, to:

                      Peninsula Bank of San Diego
                      1331 Rosecrans Street
                      San Diego, California 92166
                      Attention:     John G. Rebelo, Jr.
                      Facsimile:     (619) 226-5554

                With a copy to:

                      Reitner & Stuart
                      1319 Marsh Street
                      San Luis Obispo, California 93401
                      Attention:     Barnet Reitner
                      Facsimile:     (805) 545-8599

                If to Western, to:

                      Western Bancorp
                      4100 Newport Place
                      Suite 900
                      Newport Beach, CA 92660
                      Attention:     Julius G. Christensen 
                      Facsimile:     (949) 757-5845

                With a copy to:

                      Sullivan & Cromwell
                      1888 Century Park East
                      Los Angeles, California 90067-1725


                                     -44-
<PAGE>

                      Attention: Stanley F.  Farrar
                      Facsimile:  (310) 712-8800

          9.07  ENTIRE UNDERSTANDING; NO THIRD PARTY BENEFICIARIES.  This
Agreement and the Stock Option Agreement represent the entire understanding of
the parties hereto with reference to the transactions contemplated hereby and
thereby and this Agreement supersedes any and all other oral or written
agreements heretofore made (other than any such Stock Option Agreement).  Except
for Section 6.12, nothing in this Agreement expressed or implied, is intended to
confer upon any person, other than the parties hereto or their respective
successors, any rights, remedies, obligations or liabilities under or by reason
of this Agreement.

          9.08  INTERPRETATION; EFFECT.  When a reference is made in this
Agreement to Sections, Exhibits or Schedules, such reference shall be to a
Section of, or Exhibit or Schedule to, this Agreement unless otherwise
indicated.  The table of contents and headings contained in this Agreement are
for reference purposes only and are not part of this Agreement.  Whenever the
words "include," "includes" or "including" are used in this Agreement, they
shall be deemed to be followed by the words "without limitation." No provision
of this Agreement shall be construed to require Peninsula, Western or any of
their respective Subsidiaries, affiliates or directors to take any action which
would violate applicable law (whether statutory or common law), rule or
regulation.


                               *       *      *


                                     -45-
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed in counterparts by their duly authorized officers, all as of the day
and year first above written.


                                       PENINSULA BANK OF SAN DIEGO


                                       By: /s/ John G. Rebelo, Jr.
                                          --------------------------------------
                                          Name:   John G. Rebelo, Jr.
                                          Title:  Chairman and
                                                  Chief Executive Officer


                                       WESTERN BANCORP


                                       By: /s/ Matthew P. Wagner
                                          --------------------------------------
                                          Name:   Matthew P. Wagner
                                          Title:  President and Chief Executive 
                                                  Officer


                                       PORTOLA MERGER SUB


                                       By: /s/ Matthew P. Wagner
                                          --------------------------------------
                                          Name:   Matthew P. Wagner
                                          Title:  President


                                     -46-

<PAGE>
                                                                    EXHIBIT 23.1
 
                         INDEPENDENT AUDITORS' CONSENT
 
The Board of Directors
Western Bancorp:
 
   
We consent to the use of our report, dated January 30, 1998, incorporated by
reference herein and included in Western Bancorp's December 31, 1997 annual
report on Form 10-K, and to the reference to our firm under the heading
"Experts" in the Proxy Statement-Prospectus. Our report indicates that: (i) KPMG
Peat Marwick LLP did not audit either the 1996 consolidated financial statements
of California Commercial Bankshares or the 1996 consolidated financial
statements of SC Bancorp, both of which were acquired during 1997 in mergers and
accounted for as poolings-of-interests. Such financial statements were audited
by other auditors whose reports were furnished to KPMG Peat Marwick LLP, and
KPMG Peat Marwick LLP's opinion, insofar as it relates to California Commercial
Bankshares and SC Bancorp, is based solely on the reports of the other auditors;
(ii) The 1995 consolidated statements of operations, changes in shareholders'
equity, and cash flows of Western Bancorp, prior to their restatement for the
1997 poolings-of-interests, were audited by other auditors; (iii) The separate
1995 consolidated financial statements of California Commercial Bankshares and
SC Bancorp included in the 1995 consolidated financial statements of Western
Bancorp were audited by other auditors; and (iv) The combination of the
consolidated statements of operations, changes in shareholders' equity and cash
flows for the year ended December 31, 1995, after restatement for the 1997
poolings-of-interests, has been audited by KPMG Peat Marwick LLP.
    
 
   
                                          /s/ KPMG PEAT MARWICK LLP
    
 
   
Los Angeles, California
August 11, 1998
    

<PAGE>
                                                                    EXHIBIT 23.2
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
   
We hereby consent to the inclusion of our Independent Auditor's Report dated
January 23, 1998 regarding the balance sheets of Bank of Los Angeles as of
December 31, 1997 and 1996 and the related statements of operations, changes in
shareholder's equity and cash flows for each of the three years in the period
ending December 31, 1997, in the Form 8-K filed by Western Bancorp with the
Securities and Exchange Commission, and incorporated by reference in their Form
S-4, and the reference to our firm as experts.
    
 
   
/s/ VAVRINEK, TRINE, DAY &
CO., LLP
- ------------------------------
LLPVAVRINEK, TRINE, DAY & CO.,
 
Rancho Cucamonga, CA
August 7, 1998
    

<PAGE>
                                                                    EXHIBIT 23.3
 
INDEPENDENT AUDITORS' CONSENT
 
   
We consent to the incorporation by reference in this Registration Statement of
Western Bancorp (formerly Monarch Bancorp) on Form S-4/A of our report dated
January 19, 1996, on the statement of operations, changes in stockholders'
equity, and cash flows, of Santa Monica Bank, for the year ended December 31,
1995 incorporated by reference in the Current Report on Form 8-K/A, filed on
April 9, 1998, of Western Bancorp, incorporation by reference in the Prospectus,
which is part of this Registration Statement, and to the reference to us under
the heading "Experts" in such Prospectus.
    
 
   
/S/ DELOITTE & TOUCHE LLP
    
 
   
August 13, 1998
Los Angeles, California
    

<PAGE>
                                                                    EXHIBIT 23.4
 
INDEPENDENT AUDITORS' CONSENT
 
   
We consent to the incorporation by reference in this Registration Statement of
Western Bancorp (formerly Monarch Bancorp) on Form S-4/A of our report dated
January 24, 1997, on the consolidated balance sheet of SC Bancorp and subsidiary
as of December 31, 1996, and the related consolidated statements of operations,
changes in stockholders' equity, and cash flows, of SC Bancorp and subsidiary,
for each of the two years in the period ended December 31, 1996 incorporated by
reference in the Annual Report on Form 10-K of Western Bancorp for the year
ended December 31, 1997, incorporated by reference in the Prospectus, which is
part of this Registration Statement, and to the reference to us under the
heading "Experts" in the Prospectus.
    
 
   
/s/ DELOITTE & TOUCHE LLP
August 13, 1998
Los Angeles, California
    

<PAGE>
                                                                    EXHIBIT 23.5
 
INDEPENDENT AUDITORS' CONSENT
 
   
We consent to the incorporation by reference in this Registration Statement of
Western Bancorp (formerly Monarch Bancorp) on Form S-4/A of our report dated
January 24, 1997 (March 17, 1997, as to Notes 8 and 16), on the consolidated
statements of financial condition of California Commercial Bankshares and
subsidiaries as of December 31, 1996, and the related consolidated statements of
operations, changes in stockholders' equity, and cash flows, of California
Commercial Bankshares and subsidiary, for each of the two years in the period
ended December 31, 1996 incorporated by reference in the Annual Report on Form
10-K of Western Bancorp for the year ended December 31, 1997, incorporated by
reference in the Prospectus, which is part of this Registration Statement, and
to the reference to us under the heading "Experts" in such Prospectus.
    
 
   
/s/ DELOITTE & TOUCHE LLP
August 13, 1998
Los Angeles, California
    

<PAGE>
   
                                                                    EXHIBIT 23.8
    
 
   
CONSENT OF INDEPENDENT ACCOUNTANTS
    
 
   
We hereby consent to the inclusion of our Tax Opinion dated August 7, 1998
regarding the proper tax treatment of the merger of Bank of Los Angeles with and
into Western Bancorp in the Form 10-K filed by Western Bancorp with the
Securities and Exchange Commission, and incorporated by reference in their Form
S-4, and the reference to our firm as experts.
    
 
   
/s/ VAVRINEK, TRINE, DAY &
CO., LLP
- ------------------------------
LLPVAVRINEK, TRINE, DAY & CO.,
 
Rancho Cucamonga, CA
August 7, 1998
    

<PAGE>
                                                                    EXHIBIT 23.9
 
CONSENT OF INDEPENDENT ACCOUNTANTS
 
   
We hereby consent, as successor accountants of Dayton & Associates (said firm
being merged with and into Vavrinek, Trine, Day & Co., LLP on September 1, 1996)
to the incorporation by reference of their Independent Auditor's Report dated
February 29, 1996 regarding the consolidated balance sheets of Monarch Bancorp
and Subsidiaries as of December 31, 1995 and December 31, 1994, and the related
statements of operations, changes in capital, and cash flows for each of the two
years in the period ended December 31, 1995, in the Form 10-K of Western Bancorp
filed with the Securities and Exchange Commission, which is to be incorporated
by reference in the Form S-4 and the reference to our firm as experts.
    
 
   
/s/ VAVRINEK, TRINE, DAY &
CO., LLP
- ------------------------------
LLPVAVRINEK, TRINE, DAY & CO.,
 
Laguna Hills, CA
August 7, 1998
    

<PAGE>
                                                                   EXHIBIT 23.10
 
                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
   
As independent public accountants, we hereby consent to the incorporation by
reference in this Registration Statement of our Report of Independent Public
Accountants dated January 21, 1998 on the financial statements of Santa Monica
Bank as of and for the years ended December 31, 1997 and 1996 included in the
Form 8K/A of Western Bancorp dated April 9, 1998, and to all references to our
Firm included in this Registration Statement.
    
 
   
                                          /s/ ARTHUR ANDERSEN LLP
    
 
   
Los Angeles, California
    
 
   
August 11, 1998
    

<PAGE>
                                                                    EXHIBIT 99.1
 
   
                 [LETTERHEAD OF WEDBUSH MORGAN SECURITIES INC.]
                                AUGUST 10, 1998
    
 
   
Board of Directors
Bank of Los Angeles
8901 Santa Monica Boulevard
West Hollywood, California 90069
    
 
Ladies and Gentlemen:
 
   
We hereby consent to the inclusion of our opinion letter dated August 17, 1998
to the Board of Directors of Bank of Los Angeles ("BKLA") regarding the merger
of BKLA with and into Santa Monica Bank, a wholly-owned subsidiary of Western
Bancorp, in the Joint Proxy Statement-Prospectus and to the references therein
to our firm and to our opinion under the headings: SUMMARY--Opinion of Wedbush;
THE MERGER--Background and Reasons for the Merger, --Reasons for the Merger;
Recommendation of the BKLA Board of Directors, --Opinion of Wedbush,
and--Wedbush Fee, and THE MERGER AGREEMENT--Conditions. In giving the foregoing
consent, we do not admit (i) that we come within the category of persons whose
consent is required under Section 7 of the Securities Act of the 1933, as
amended (the "Securities Act"), or the rules and regulations of the Securities
and Exchange Commission promulgated thereunder, or (ii) that we are experts with
respect to any part of the Joint Proxy Statement-Prospectus within the meaning
of the term "experts" as used in the Securities Act and the rules and
regulations of the Securities and Exchange Commission promulgated thereunder.
    
 
   
<TABLE>
<S>                             <C>  <C>
                                Very truly yours,
                                WEDBUSH MORGAN SECURITIES INC.
 
                                By:  /s/ BARTON I. GUREWITZ
                                     -----------------------------------------
                                     Barton I. Gurewitz
                                     Managing Director, Investment Banking
</TABLE>
    

<PAGE>
                                                                    EXHIBIT 99.2
 
                    WESTERN BANCORP AND BANK OF LOS ANGELES
 
                             LETTER OF TRANSMITTAL
 
                                      FOR
                        BANK OF LOS ANGELES COMMON STOCK
 
PLEASE READ THE ENCLOSED INSTRUCTIONS CAREFULLY BEFORE COMPLETING THIS FORM.
 
TO BE COMPLETED, SIGNED AND MAILED OR DELIVERED WITH CERTIFICATES FORMERLY
REPRESENTING SHARES OF THE COMMON STOCK OF THE BANK OF LOS ANGELES, WHICH ARE TO
BE EXCHANGED FOR CERTIFICATES REPRESENTING SHARES OF THE COMMON STOCK OF WESTERN
BANCORP.
 
                                EXCHANGE AGENT:
                        U.S. Stock Transfer Corporation
                         1745 Gardena Avenue, Suite 200
                        Glendale, California 91204-2991
                           Telephone: (818) 502-1404
                           Facsimile: (818) 502-0674
                            Attention: William Garza
 
Ladies and Gentlemen:
 
    In accordance with the Agreement and Plan of Merger (the "Merger
Agreement"), dated as of April 16, 1998, and amended and restated as of June 24,
1998 and July 16, 1998, by and among Western Bancorp ("Western"), Santa Monica
Bank and the Bank of Los Angeles ("BKLA"), which provides for the merger (the
"Merger") of BKLA with and into Santa Monica Bank, a California banking
corporation and a wholly-owned subsidiary of Western, the undersigned, as the
registered holder(s) of the certificate(s) representing common stock of BKLA
("BKLA Common Stock") described in Box A below (the "BKLA Certificate(s)") or
the assignee of such registered holder(s), hereby surrender(s) such BKLA
Certificate(s) listed below in exchange for a certificate or certificates
representing shares of common stock, no par value, of Western (the "Western
Common Stock") on the basis of 0.4224 shares of Western Common Stock for each
share of BKLA Stock represented by the certificate(s) so surrendered.
 
    Please issue one certificate (unless otherwise directed by written
instructions attached hereto) for the shares of Western Common Stock to which
the undersigned is entitled. Unless otherwise specified in Box B or C below, the
undersigned requests that his or her certificate(s) be issued in the name(s) and
mailed to the address(es) set forth in Box A.
<PAGE>
 
<TABLE>
<CAPTION>
 ----------------------------------------------------------------------------------------------------
                         BOX A: DESCRIPTION OF BKLA COMMON STOCK SURRENDERED
 ----------------------------------------------------------------------------------------------------
      NAME(S) AND ADDRESS(ES) OF HOLDER(S) OF RECORD             CERTIFICATE(S) BEING SURRENDERED
               AS SHOWN ON RECORDS OF BKLA*                  (ATTACH SEPARATE SCHEDULE IF NECESSARY)
<S>                                                         <C>                   <C>
- ------------------------------------------------------------------------------------------------------
                                                                CERTIFICATE              NUMBER
                                                                  NUMBERS              OF SHARES
                                                            ------------------------------------------
 
                                                            ------------------------------------------
 
                                                            ------------------------------------------
 
                                                            ------------------------------------------
 
                                                            ------------------------------------------
 
                                                            ------------------------------------------
 
                                                            ------------------------------------------
 
                                                            ------------------------------------------
 
                                                                TOTAL SHARES
- ------------------------------------------------------------------------------------------------------
</TABLE>
 
*If shares are held jointly, list first and circle the name of the person whose
taxpayer identification number you enter in Substitute Form W-9 (see the
Instructions on the enclosed Substitute Form W-9 for guidance as to which
taxpayer identification number to report).
 
- --------------------------------------------------------------------------------
 
  BOX B:
 
                         SPECIAL ISSUANCE INSTRUCTIONS
                              (SEE INSTRUCTION 5)
 
      To be completed ONLY if the certificate(s) representing Western Common
  Stock is (are) to be issued in the name(s) of someone other than the
  person(s) in whose name(s) the BKLA Certificate(s) being surrendered
  pursuant to this Letter of Transmittal is (are) registered or to correct the
  name(s) set forth in Box A. (Unless otherwise indicated in Box C, the
  certificate(s) representing the Western Common Stock will be mailed to the
  address indicated in Box A).
 
      Issue the certificate(s) representing Western Common Stock in the
  name(s) of:
 
                                 (PLEASE PRINT)
                    (ATTACH SEPARATE SCHEDULE IF NECESSARY)
 
  Name _______________________________________________________________________
 
  ____________________________________________________________________________
 
  Address ____________________________________________________________________
 
  ____________________________________________________________________________
 
  ____________________________________________________________________________
                               (INCLUDE ZIP CODE)
 
  (Taxpayer Identification or Social Security Number(s) of Person(s) Named in
  this Box B: ________________________________________________________________
 
  ____________________________________________________________________________
 
- --------------------------------------------------------------------------------
<PAGE>
- ------------------------------------------------
 
  BOX C:
 
                          SPECIAL MAILING INSTRUCTIONS
                              (SEE INSTRUCTION 8)
 
      To be completed ONLY if the certificate(s) representing Western Common
  Stock is (are) to be mailed to an address other than indicated in Box A
  above.
 
  Mail the certificate(s) representing Western Common Stock to:
                                 (PLEASE PRINT)
 
  Address ____________________________________________________________________
  ____________________________________________________________________________
 
  ____________________________________________________________________________
                               (INCLUDE ZIP CODE)
  Attention:__________________________________________________________________
 
- ------------------------------------------------------------
- ------------------------------------------------------------
 
  BOX D:
 
                              SIGNATURE GUARANTEE
                              (SEE INSTRUCTION 6)
 
      To be completed in all cases specified in Instructions 5 and 6 herein.
 
      The undersigned hereby guarantees the signature(s) that appear(s) in Box
  E on this Transmittal Form.
 
  ____________________________________________________________________________
                          (NAME OF GUARANTEEING FIRM)
 
  By _________________________________________________________________________
                             (SIGNATURE OF OFFICER)
 
   __________________________________________________________________________
                   (TITLE OF OFFICER SIGNING THIS GUARANTEE)
 
   __________________________________________________________________________
 
   __________________________________________________________________________
              (ADDRESS OF GUARANTEEING FIRM AND TELEPHONE NUMBER)
 
- -----------------------------------------------------
<PAGE>
NOTE: ALL SHAREHOLDERS MUST SIGN IN THE SPACE PROVIDED BELOW
 
- --------------------------------------------------------------------------------
 
  BOX E:
 
                                  SIGNATURE(S)
 
  Dated: ______________________________________________________________ , 1998
                                 (PLEASE PRINT)
 
  SIGN
  HERE -->____________________________________________________________________
 
  ____________________________________________________________________________
                          (SIGNATURE(S) OF HOLDER(S))
 
  Telephone Number:___________________________________________________________
                              (INCLUDE AREA CODE)
 
  Must be signed by registered holder(s) exactly as the name(s) appear(s) on
  the BKLA Certificate(s) as indicated in Box A, or by person(s) authorized to
  become registered holder(s). Signature(s) must be guaranteed in Box D in all
  cases specified in Instructions 5 and 6. SEE INSTRUCTIONS 2, 5 AND 6.
 
- ------------------------------------------
 
PLEASE COMPLETE THE ENCLOSED SUBSTITUTE FORM W-9 AND RETURN IT TO U.S. STOCK
TRANSFER CORPORATION WITH YOUR CERTIFICATES REPRESENTING SHARES OF BKLA COMMON
STOCK.
 
                          *IMPORTANT TAX INFORMATION*
 
Please be advised that irrespective of whether you have previously furnished a
taxpayer identification number (social security number for individuals, or
employer identification number for corporations) or the certification on
Substitute Form W-9 with respect to dividend payments, you must again furnish
this number, certified to be correct under penalties of perjury, to assure that
back-up withholding of 31% will not be applied. CERTIFICATION SHOULD BE MADE TO
THE EXCHANGE AGENT ON SUBSTITUTE FORM W-9, A COPY OF WHICH IS ENCLOSED.
<PAGE>
             INSTRUCTIONS TO LETTER OF TRANSMITTAL FOR SURRENDERING
                    CERTIFICATES THAT HERETOFORE REPRESENTED
               SHARES OF COMMON STOCK OF THE BANK OF LOS ANGELES
 
    1.  GENERAL.  In accordance with the Agreement and Plan of Merger (the
"Merger Agreement"), dated as of April 16, 1998, and amended and restated as of
June 24, 1998 and July 16, 1998 by and among Western Bancorp ("Western"), Santa
Monica Bank and the Bank of Los Angeles ("BKLA"), which provides for the merger
(the "Merger") of BKLA with and into Santa Monica Bank, a California banking
corporation and a wholly-owned subsidiary of Western, each holder of shares of
common stock of BKLA ("BKLA Common Stock") (other than (a) shares that have not
been voted in favor of the approval of the principal terms of the Merger and
with respect to which Dissenters' Rights (as defined in the Merger Agreement)
have been perfected in accordance with the California General Corporation Law
and (b) shares held directly or indirectly by Western, other than shares held in
a fiduciary capacity or in satisfaction of a debt previously contracted) has
become entitled to receive a certificate or certificates representing 0.4224
shares of common stock of Western ("Western Common Stock") for each former share
of BKLA Common Stock represented by BKLA Common Stock certificate(s) ("BKLA
Certificate(s)"). The Letter of Transmittal, or a copy thereof, properly
completed and SIGNED, must be used in connection with all exchanges of BKLA
Certificate(s) for Western Common Stock certificate(s), under the terms of the
Merger Agreement. THE METHOD OF DELIVERY OF BKLA CERTIFICATE(S) AND ANY OTHER
DOCUMENTS (SEE BELOW) IS AT THE ELECTION AND RISK OF SURRENDERING SHAREHOLDERS
OF BKLA, BUT IF SENT BY MAIL, IT IS RECOMMENDED THAT REGISTERED MAIL, PROPERLY
INSURED, BE USED. Transmit your BKLA Certificate(s) and other required documents
to the address set forth on the Letter of Transmittal. DELIVERY WILL BE DEEMED
EFFECTIVE ONLY WHEN ACTUALLY RECEIVED AT THE OFFICE OF THE EXCHANGE AGENT.
DELIVERY OF THE LETTER OF TRANSMITTAL TO AN ADDRESS OTHER THAN THAT SET FORTH IN
THE LETTER OF TRANSMITTAL WILL NOT CONSTITUTE A VALID DELIVERY.
 
    2.  SIGNATURES, AND GUARANTY OF SIGNATURE.  The signature (or signatures, in
the case of any BKLA Certificate(s) owned by two or more joint holders) on the
Letter of Transmittal should correspond exactly with the name(s) of the
registered owner(s) as written on the face of the BKLA Certificate(s) unless
such BKLA Certificate(s) has (have) been transferred by the registered owner(s),
in which event the Letter of Transmittal should be signed in exactly the same
form as the name of the last transferee indicated on the transfers attached to
or endorsed on the BKLA Certificate(s).
 
    When signing as agent, attorney, administrator, executor, guardian, trustee,
or in any other fiduciary or representative capacity, or as an officer of a
corporation on behalf of the corporation, give full title as such. If the BKLA
Certificate(s) has (have) been transferred or assigned and new certificate(s)
has (have) not yet been received in the name of the transferee or assignee, the
Transmittal Letter must be signed by the transferee or assignee or by his or her
agent, and should not be signed by the transferor or assignor.
 
    The BKLA Certificate(s), if registered in the name(s) of the person(s)
signing the Letter of Transmittal, needs (need) not be endorsed or accompanied
by any instrument of assignment or transfer other than the Letter of
Transmittal.
 
    3.  31% BACK-UP WITHHOLDING.  Under the federal income tax law, a
shareholder who delivers BKLA Common Stock is required by law to provide the
Exchange Agent with his or her correct taxpayer identification number ("TIN")
(i.e., social security number for individuals or employer identification number
for corporations) on the Substitute Form W-9 provided below. If the Exchange
Agent is not provided with the correct TIN, the shareholder may be subject to a
$50 penalty imposed by the Internal Revenue Service. In addition, delivery to
such shareholder of a check for the payment of dividends, if any, on Western
Common Stock will be subject to 31% back-up withholding unless the completed
Substitute Form W-9 is received by the Exchange Agent. See the enclosed
Substitute Form W-9 for additional instructions.
 
    Certain shareholders, including, among others, all corporations and certain
foreign individuals, are not subject to these back-up withholding and reporting
requirements. In order for a foreign individual to qualify as an exempt
recipient, that shareholder must submit a statement, signed under penalty of
perjury, to the Exchange Agent (which form the Exchange Agent will provide upon
request) attesting to the individual's exempt status. NOTE: Other exempt
recipients (such as corporations) must in any event complete and return the
Substitute Form W-9 to the Exchange Agent in order to avoid back-up withholding
(see the Specific Instructions on the Substitute Form W-9 dealing with "Exempt
Payees and Payments").
 
    If back-up withholding applies, the Exchange Agent is required to withhold
31% of the payment made to the shareholder of dividends, if any, on Western
Common Stock. Back-up withholding is not an additional tax. Rather, the tax
liability of persons subject to back-up withholding will be reduced by the
amount of tax withheld. If withholding results in an overpayment of taxes, a
refund may be obtained from the Internal Revenue Service.
<PAGE>
    Western reserves the right in its sole discretion to direct the Exchange
Agent to take whatever steps are necessary to comply with Western's obligations
regarding back-up withholding.
 
    To prevent back-up withholding with respect to any payment, the shareholder
is required to notify the Exchange Agent of his or her correct TIN by completing
the enclosed Substitute Form W-9.
 
    The shareholder is required to give the Exchange Agent the TIN of the record
owner of BKLA Common Stock. If the shares of BKLA Common Stock are in more than
one name or are not in the name of the actual owner, consult the enclosed
Substitute Form W-9 for additional guidance on which TIN to report.
 
    4.  MUTILATED, LOST, STOLEN OR DESTROYED CERTIFICATES.  If any BKLA
Certificate(s) has (have) been mutilated, lost, stolen or destroyed, you should
so indicate in Box A of this Letter of Transmittal. The Exchange Agent will send
you additional documentation to complete in order to surrender effectively such
lost or destroyed BKLA Certificate(s) and further instructions as to obtaining
any surety bond that may be required to be posted.
 
    THE INSTRUCTIONS IN ITEMS 5 AND 6, BELOW, NEED ONLY BE FOLLOWED IF THE
REGISTERED OWNER DESIRES TO MAKE A CHANGE OF OWNERSHIP OR A CORRECTION OF, OR
CHANGE IN, NAME.
 
    5.  TRANSFER INSTRUCTIONS.
 
        (a)  CHANGE OF OWNERSHIP.  If any certificate(s) representing Western
    Common Stock is (are) to be issued in the name of someone other than the
    registered owner(s) of the BKLA Certificate(s) being surrendered, please
    complete the Special Issuance instructions in Box B on the Letter of
    Transmittal and be guided by the following:
 
           (i)  ENDORSEMENT.  The BKLA Certificate(s) being surrendered must be
       properly endorsed (or accompanied by appropriate stock powers properly
       executed) by the registered owner(s) of such BKLA Certificate(s) to the
       person who is to receive the certificate(s) representing Western Common
       Stock. The signature of the registered owner(s) on the endorsement or
       stock powers must correspond exactly with the name as written upon the
       face of the BKLA Certificate(s) being surrendered and must be guaranteed
       as described in Instruction 6.
 
           (ii)  TRANSFER TAXES.  In the event that any transfer or other taxes
       may become payable by reason of the issuance of any certificate(s)
       representing Western Common Stock in any name other than that of the
       registered owner(s) of the BKLA Certificate(s) being surrendered, the
       transferee or assignee must pay such tax to the Exchange Agent or must
       establish to the satisfaction of the Exchange Agent that such tax has
       been paid or is not payable. Except as otherwise provided in this
       Instruction 5(a)(ii), it will not be necessary for transfer tax stamps to
       be affixed to the BKLA Certificate(s) transmitted with the Letter of
       Transmittal.
 
        (b)  CORRECTION OF, OR CHANGE IN, NAME.  For a correction of name or for
    a change in name that does not involve a change of ownership, please
    complete the Special Issuance Instructions in Box B on the Letter of
    Transmittal and proceed as follows: for a change in name by marriage, etc.,
    the BKLA Certificate(s) being surrendered should be endorsed, E.G., "Mary
    Doe, now by marriage Mary Jones," with the endorsement signature guaranteed
    as described in Instruction 6. For a correction in name, the BKLA
    Certificate(s) being surrendered should be endorsed, E.G., "Samuel J. Snow,
    incorrectly inscribed as S.J. Snow," with the endorsement signature
    guaranteed as described in Instruction 6.
 
    6.  SIGNATURE GUARANTEE.  If the certificate(s) representing Western Common
Stock is (are) to be issued in a name different from that appearing on the face
of the surrendered BKLA Certificate(s), the BKLA Certificate(s) must be properly
endorsed by the registered owner(s) thereof or accompanied by appropriate stock
powers properly executed and the signature(s) to the endorsement or on the stock
power must be guaranteed by an eligible institution, such as a bank, credit
union or broker, that is a member of, or a participant in, a signature medallion
program.
 
    7.  SUPPORTING EVIDENCE.  If the Letter of Transmittal, an endorsement of
the surrendered BKLA Certificate(s) or a stock power is executed by a person
(other than the registered owner) as an agent, attorney, administrator,
executor, guardian, trustee, or in any other fiduciary or representative
capacity, or by an officer of a corporation on behalf of the corporation, there
must be submitted with the Letter of Transmittal the following: the BKLA
Certificate(s) being surrendered and any stock powers and documentary evidence
of appointment and authority to act in such capacity (including court orders
where necessary), as well as evidence of the authority of the person making such
execution to assign, sell or transfer shares. Such documentary evidence of
authority must be in form satisfactory to the Exchange Agent.
 
    8.  SPECIAL MAILING INSTRUCTIONS.  Unless instructions to the contrary are
given in the Special Mailing Instructions in Box C on the Letter of Transmittal,
any certificate(s) representing Western Common Stock and to be issued upon
surrender of BKLA Certificate(s) in accordance with the Letter of Transmittal
will be mailed to the address shown in Box A.
<PAGE>
    9.  ADDITIONAL COPIES.  Additional copies of the Letter of Transmittal may
be obtained from the Exchange Agent.
 
    10.  INQUIRIES.  All inquiries with respect to the surrender of BKLA
Certificate(s) should be made directly to the Exchange Agent at the address or
telephone number on the first page.
<PAGE>
 
<TABLE>
<C>                               <S>                              <C>
- ---------------------------------------------------------------------------------------------------
           SUBSTITUTE             PART 1--PLEASE PROVIDE YOUR TIN     Social Security Number OR
            FORM W-9              IN THE BOX AT RIGHT AND CERTIFY   Employer Identification Number
   Department of the Treasury     BY SIGNING AND DATING BELOW
    Internal Revenue Service                                           ------------------------
                                  -----------------------------------------------------------------
                                  For Payees exempt from backup withholding, see the enclosed
                                  Guidelines of Taxpayer Identification Number on Substitute Form
                                  W-9 and complete as instructed under
  Payer's Request for Taxpayer    "Important Tax Information" above.
  Identification Number (TIN)
                                  -----------------------------------------------------------------
                                  PART 3--Awaiting TIN  / /
- ---------------------------------------------------------------------------------------------------
 PART 2--CERTIFICATION--UNDER PENALTY OF PERJURY, I CERTIFY THAT:
 
 (1) the number shown on this form is my correct Taxpayer Identification Number (or I am waiting
 for a number to be issued to me); and
 
 (2) I am not subject to backup withholding because (i) I am exempt from backup withholding, (ii) I
 have not been notified by the Internal Revenue Service (the "IRS") that I am subject to backup
 withholding as a result of a failure to report all interest or dividends, or (iii) the IRS has
 notified me that I am no longer subject to backup withholding.
 
 CERTIFICATION INSTRUCTIONS--You must cross out item (2) in Part 2 above if you have been notified
 by the IRS that you are subject to backup withholding because of under-reporting interest or
 dividends on your tax return. However, if after being notified by the IRS that you were subject to
 backup withholding you received another notification from the IRS stating that you are no longer
 subject to backup withholding, do not cross out item (2).
 
 Signature ----------------------------------------------------------------- Date
 --------------------
 Name (Please Print)
 ---------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------
</TABLE>
 
NOTE: FAILURE TO COMPLETE AND RETURN THIS FORM MAY RESULT IN BACKUP WITHHOLDING
    OF 31% OF ANY PAYMENTS MADE TO YOU PURSUANT TO THE OFFER. PLEASE REVIEW
    THE ENCLOSED GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
           NUMBER ON SUBSTITUTE FORM W-9 FOR ADDITIONAL INFORMATION.
 
               YOU MUST COMPLETE THE FOLLOWING CERTIFICATE IF YOU
               CHECKED THE BOX IN PART 3 OF SUBSTITUTE FORM W-9.
<PAGE>
            GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                         NUMBER ON SUBSTITUTE FORM W-9
 
GUIDELINES FOR DETERMINING THE PROPER NAME AND IDENTIFICATION NUMBER.-- Social
Security numbers have nine digits separated by two hyphens: i.e., 000-00-0000.
Employer identification numbers have nine digits separated by only one hyphen:
i.e., 00-0000000. The table below will help determine the name and number to
provide.
<TABLE>
<CAPTION>
                                 GIVE THE NAME AND SOCIAL
  FOR THIS TYPE OF ACCOUNT         SECURITY NUMBER OF--
- -----------------------------  -----------------------------
<S>                            <C>
1. An individual's account     The individual
 
2. Two or more individuals     The actual owner of the
  (joint account)              account or, if combined
                               funds, any one of the
                               individuals(1)
 
3. Custodian account of a      The minor(2)
  minor (Uniform Gift to
  Minors Act)
 
4. a. The usual revocable      The grantor-trustee(1)
      savings trust account
      (grantor is also
      trustee)
 b. So-called trust account    The actual owner(1)
    that is not a legal or
    valid trust under State
    law
 
5. Sole proprietorship         The owner(3)
  account
 
<CAPTION>
 
                                GIVE THE NAME AND EMPLOYER
  FOR THIS TYPE OF ACCOUNT     IDENTIFICATION NUMBER OF--
- -----------------------------  -----------------------------
<S>                            <C>
6.  Sole proprietorship        The owner(3)
  account
 
7.  A valid trust, estate, or  The legal entity(4)
    pension trust
8. Corporate account           The corporation
 
9.  Association, club,         The organization
    religious, charitable,
    educational or other
    tax-exempt organization
    account
 
10. Partnership                The partnership
 
11. A broker or registered     The broker or nominee
    nominee
 
12. Account with the           The public entity
    Department of Agriculture
    in the name of a public
    entity (such as a State
    or local government,
    school district, or
    prison) that receives
    agricultural program
    payments
</TABLE>
 
- ------------------------------
 
(1) List first and circle the name of the person whose number you furnish.
 
(2) Circle the minor's name and furnish the minor's social security number.
 
(3) You must show your individual name, but you may also enter your business or
    "doing business as" name. You may use either your Social Security Number or
    Employer Identification Number.
 
(4) List first and circle the name of the legal trust, estate, or pension trust.
    (Do not furnish the identifying number of the personal representative or
    trustee unless the legal entity itself is not designated in the account
    title.)
 
Note: If no name is circled when more than one name is listed, the number will
    be considered to be that of the first name listed.
<PAGE>
            GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                          NUMBER ON SUBSTITUTE FORM W-9
                                      PAGE 2
 
OBTAINING A NUMBER
 
If you don't have a taxpayer identification number or you don't know your
number, obtain Form SS-5, Application for a Social Security Number Card (for
individuals), or Form SS-4, Application for Employer Identification Number (for
businesses and all other entities), at the local office of the Social Security
Administration or the Internal Revenue Service and apply for a number.
 
PAYEES EXEMPT FROM BACKUP WITHHOLDING
 
The following is a list of payees specifically exempted from backup withholding
depending upon the type of payment (see below):
 
 (1) A corporation.
 
 (2) An organization exempt from tax under section 501(a), or an IRA or a
     custodial account under section 403 (b) (7).
 
 (3) The United States or any agency or instrumentality thereof.
 
 (4) A State, the District of Columbia, a possession of the United States, or
     any subdivision or instrumentality thereof.
 
 (5) A foreign government, a political subdivision of a foreign government, or
     any agency or instrumentality thereof.
 
 (6) An international organization or any agency or instrumentality thereof.
 
 (7) A foreign central bank of issue.
 
 (8) A dealer in securities or commodities required to register in the U.S. or a
     possession of the U.S.
 
 (9) A futures commission merchant registered with the Commodity Futures Trading
     Commission.
 
 (10) A real estate investment trust.
 
 (11) An entity registered at all times during the tax year under the Investment
      Company Act of 1940.
 
 (12) A common trust fund operated by a bank under section 584(a).
 
 (13) A financial institution.
 
 (14) A middleman known in the investment community as a nominee or listed in
      the most recent publication of the American Society of Corporate
      Secretaries, Inc., Nominee List.
 
 (15) A trust exempt from tax under section 664 or described in section 4947.
 
For interest and dividends, all listed payees are exempt except item (9). For
broker transactions, payees listed in items (1) through (13) and a person
registered under the Investment Advisers Act of 1940 who regularly acts as a
broker are exempt.
 
Exempt payees described above should file Form W-9 to avoid possible erroneous
backup withholding. FILE THIS FORM WITH THE PAYER, FURNISH YOUR TAXPAYER
IDENTIFICATION NUMBER, WRITE "EXEMPT" IN PART 1 OF THE FORM, AND RETURN IT TO
THE PAYER. If you are a nonresident alien or a foreign entity not subject to
backup withholding, give the payer a completed Form W-8, Certificate of Foreign
Status.
 
PRIVACY ACT NOTICE.--Section 6109 requires most recipients of dividend,
interest, or other payments to give taxpayer identification numbers to payers
who must report the payments to IRS. The IRS uses the numbers for identification
purposes. Payers must be given the numbers whether or not recipients are
required to file tax returns. Payers must generally withhold 31% of taxable
interest, dividend, and certain other payments to a payee who does not furnish a
taxpayer identification number to a payer. Certain penalties may also apply.
 
PENALTIES
 
(1) Failure To Furnish Taxpayer Identification Number.--If you fail to furnish
your correct taxpayer identification number to a payer, you are subject to a
penalty of $50 for each such failure unless your failure is due to reasonable
cause and not to willful neglect.
 
(2) Civil Penalty For False Information With Respect To Withholding.--If you
make a false statement with no reasonable basis which results in no imposition
of backup withholding, you are subject to a penalty of $500.
 
(3) Criminal Penalty For Falsifying Information.--Willfully falsifying
certifications or affirmations may subject you to criminal penalties including
fines and/or imprisonment.
 
FOR ADDITIONAL INFORMATION CONTACT YOUR TAX CONSULTANT OR THE INTERNAL REVENUE
SERVICE.


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