COLONIAL BANCGROUP INC
S-4, 1998-08-20
STATE COMMERCIAL BANKS
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<PAGE>   1
 
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON AUGUST 20, 1998
 
                                                      REGISTRATION NO. 33-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                             ---------------------
 
                                    FORM S-4
 
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                             ---------------------
 
                          THE COLONIAL BANCGROUP, INC.
             (Exact name of Registrant as specified in its charter)
                             ---------------------
 
<TABLE>
<S>                             <C>                             <C>
           DELAWARE                          6711                         63-0661573
   (State of Incorporation)      (Primary Standard Industrial          (I.R.S. Employer
                                  Classification Code Number)         Identification No.)
ONE COMMERCE STREET, SUITE 800                                          (334) 240-5000
   MONTGOMERY, ALABAMA 36104                                            (Telephone No.)
(Address of principal executive
            offices)
</TABLE>
 
                             ---------------------
                               WILLIAM A. MCCRARY
                        VICE PRESIDENT AND LEGAL COUNSEL
                              POST OFFICE BOX 1108
                         MONTGOMERY, ALABAMA 36101-1108
                    (Name and address of agent for service)
                             ---------------------
                                   COPIES TO:
 
<TABLE>
<S>                                            <C>
           WILLARD H. HENSON, ESQ.                         MARVIN W. MURPHY, ESQ.
   MILLER, HAMILTON, SNIDER & ODOM, L.L.C.                 LYLE & MURPHY, L.L.P.
             ONE COMMERCE STREET                          245 EAST LIBERTY STREET
                  SUITE 305                                     THIRD FLOOR
          MONTGOMERY, ALABAMA 36104                          RENO, NEVADA 89501
           TELEPHONE: 334-834-5550                        TELEPHONE: 702-348-5000
           FACSIMILE: 334-265-4533                        FACSIMILE: 702-348-7273
</TABLE>
 
    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:  As soon as
practicable after the effective time of the proposed merger of InterWest Bancorp
("InterWest") with and into the Registrant (the "Merger") as described in the
Agreement and Plan of Merger, dated as of June 16, 1998, attached as Exhibit A
to the Proxy Statement and Prospectus forming a part of this Registration
Statement.
 
    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. [ ]
 
                        CALCULATION OF REGISTRATION FEE
 
<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------------------
                                                        PROPOSED           PROPOSED
    TITLE OF EACH CLASS OF            AMOUNT             MAXIMUM            MAXIMUM           AMOUNT OF
          SECURITIES                   TO BE         OFFERING PRICE        AGGREGATE        REGISTRATION
       TO BE REGISTERED            REGISTERED(1)        PER UNIT       OFFERING PRICE(2)         FEE
- -----------------------------------------------------------------------------------------------------------
<S>                              <C>                <C>                <C>                <C>
Common Stock, par value $2.50
  per share....................      2,240,549       Not Applicable      $7,984,985.40        $2,355.57
- -----------------------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------------------
</TABLE>
 
(1) This Registration Statement covers the maximum number of shares of common
    stock of the Registrant which is expected to be issued in connection with
    the Merger.
(2) Estimated solely for purposes of calculating the registration fee and,
    pursuant to Rule 457(f)(2) under the Securities Act of 1933, as amended,
    based upon the June 30, 1998 book value of $2.52 per share of 3,168,645
    shares of InterWest common stock, without par value, including 80,500 shares
    subject to stock options.
                             ---------------------
 
    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON EACH 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 SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SECTION 8(A), MAY
DETERMINE.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2
 
                                (INTERWEST LOGO)
                                                                          , 1998
 
Dear Shareholder:
 
     You are cordially invited to attend the Special Meeting of Shareholders
(the "Special Meeting") of InterWest Bancorp ("InterWest"), which will be held
on           , 1998, at   9 a.m. local time. The Special Meeting will be held at
2330 South Virginia Street, Reno, Nevada.
 
     At the Special Meeting, shareholders of InterWest will be asked to consider
and vote on approval of an Agreement and Plan of Merger, dated as of June 16,
1998 (the "Agreement"), between InterWest and The Colonial BancGroup, Inc.
("BancGroup"), pursuant to which InterWest will be merged (the "Merger") with
BancGroup. In the Merger, InterWest shareholders will receive whole shares of
BancGroup Common Stock in exchange for shares of InterWest Common Stock held by
them. Each share of InterWest Common Stock outstanding at the effective time of
the Merger will be converted into the right to receive shares of BancGroup
Common Stock (as calculated in accordance with the terms of the Agreement). Cash
will be paid for any fractional shares. Please see the attached Proxy Statement
and Prospectus for a detailed description of the terms of the Merger and the
formula for converting shares of InterWest Common Stock into shares of BancGroup
Common Stock in the Merger.
 
     THE BOARD OF DIRECTORS HAS UNANIMOUSLY APPROVED THE AGREEMENT AND THE
MERGER AS BEING IN THE BEST INTERESTS OF INTERWEST SHAREHOLDERS AND RECOMMENDS
THAT YOU VOTE IN FAVOR OF THE APPROVAL OF THE AGREEMENT.
 
     Additional information regarding the Agreement, the Merger, InterWest and
BancGroup is set forth in the attached Proxy Statement, which also serves as the
Prospectus for the shares of BancGroup Common Stock to be issued in connection
with the Merger. Please read these materials and carefully consider the
information contained in them.
 
     The affirmative vote of the holders of a majority of the outstanding shares
of InterWest Common Stock is required to approve the Agreement. Whether or not
you plan to attend the Special Meeting, you are urged to complete, sign and
promptly return the enclosed Proxy Card to assure that your shares will be voted
at the Special Meeting. If you attend the Special Meeting, you may vote in
person if you wish, and your proxy will not be used.
 
                                           Sincerely,
 
                                           -------------------------------------
                                                     RICHARD MARTUCCI
                                           President and Chief Executive Officer
<PAGE>   3
 
                               INTERWEST BANCORP
                           2330 SOUTH VIRGINIA STREET
                               RENO, NEVADA 89502
                                 (702) 827-7233
 
                             ---------------------
 
                   NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
                 TO BE HELD ON                , 1998, AT 9 A.M.
                             ---------------------
 
     NOTICE IS HEREBY GIVEN that a special meeting of shareholders (the "Special
Meeting") of InterWest Bancorp ("InterWest") will be held at 2330 South Virginia
Street, Reno, Nevada on               , 1998, at 9 a.m., local time, for the
following purposes:
 
          1. Merger.  To consider and vote upon the proposed merger (the
     "Merger") of InterWest with and into The Colonial BancGroup, Inc.
     ("BancGroup"), in accordance with an Agreement and Plan of Merger, dated as
     of June 16, 1998, between InterWest and BancGroup (the "Agreement").
     BancGroup will be the surviving corporation in the Merger. Each share of
     common stock of InterWest outstanding at the time of the Merger will be
     converted into the right to receive shares of BancGroup Common Stock (as
     calculated in accordance with the terms of the Agreement), with cash paid
     in lieu of fractional shares at the market value of such fractional shares,
     as described in greater detail in the accompanying Proxy Statement and
     Prospectus. The Agreement is attached to the Proxy Statement and Prospectus
     as Appendix A.
 
          2. Other Matters.  To transact such other business as may properly
     come before the Special Meeting or any adjournments or postponements
     thereof.
 
     The Board of Directors of InterWest has fixed the close of business on
          , 1998, as the record date for the determination of shareholders
entitled to notice of, and to vote at, the Special Meeting. Only holders of
record of the common stock of InterWest at the close of business on that date
will be entitled to notice of, and to vote at, the Special Meeting or any
adjournments or postponements thereof. InterWest shareholders are entitled to
assert dissenters' rights of appraisal pursuant to Section 92A.300 et seq. of
the Nevada Revised Statutes. InterWest shareholders who comply with the
provisions of applicable Nevada law relating to dissenters' rights will be
entitled to object to the Agreement and make written demand that BancGroup pay
them in cash the fair value of their shares. A copy of the dissenters' rights
provisions is attached to the enclosed Proxy Statement and Prospectus as
Appendix B.
 
     You are cordially invited to attend the Special Meeting, but whether or not
you plan to attend, please complete and sign the enclosed form of proxy and mail
it promptly in the enclosed envelope. The proxy may be revoked at any time by
filing a written revocation with the Secretary of InterWest, by executing a
later dated proxy and delivering it to the Secretary of InterWest at or prior to
the Special Meeting, or by attending the Special Meeting and voting in person.
 
                                          BY ORDER OF THE BOARD OF DIRECTORS
 
                                          --------------------------------------
                                                     RICHARD MARTUCCI
                                          President and Chief Executive Officer
 
               , 1998
<PAGE>   4
 
                                   PROSPECTUS
 
                         COMMON STOCK, $2.50 PAR VALUE
 
                          THE COLONIAL BANCGROUP, INC.
                             ---------------------
 
                                PROXY STATEMENT
 
                     FOR SPECIAL MEETING OF SHAREHOLDERS OF
 
                               INTERWEST BANCORP
                          TO BE HELD ON        , 1998
 
    This Proxy Statement and Prospectus (the "Prospectus") relates to the
proposed merger (the "Merger") of InterWest Bancorp, a Nevada corporation
("InterWest"), with and into The Colonial BancGroup, Inc., a Delaware
corporation ("BancGroup"). This Prospectus is being furnished to the
shareholders of InterWest in connection with the solicitation of proxies by the
Board of Directors of InterWest for use at a special meeting of the shareholders
of InterWest to be held on             , 1998, at 9 a.m., local time, at 2330
South Virginia Street, Reno, Nevada, and any adjournments or postponements
thereof (the "Special Meeting"). At the Special Meeting, shareholders of
InterWest will consider and vote upon the matters set forth in the preceding
Notice of Special Meeting of the Shareholders, as described in greater detail in
this Prospectus.
 
    The Merger will be consummated pursuant to the terms of a certain Agreement
and Plan of Merger dated as of June 16, 1998 by and between BancGroup and
InterWest (the "Agreement"). The Agreement provides that, subject to the
approval of the Agreement by the shareholders of InterWest at the Special
Meeting and the satisfaction (or waiver, to the extent that such waiver is
permitted by law) of other conditions contained in the Agreement, InterWest will
be merged with and into BancGroup, and BancGroup will be the surviving
corporation. Each issued and outstanding share of common stock without par
value, of InterWest (the "InterWest Common Stock"), will be converted into
0.4714 shares of the common stock, $2.50 par value per share, of BancGroup (the
"BancGroup Common Stock"), provided that the "Market Value" of BancGroup Common
Stock (as defined below) is neither less than $15.00 per share nor more than
$20.00 per share. The "Market Value" of BancGroup Common Stock shall be the
average of the closing prices of BancGroup Common Stock as reported on the New
York Stock Exchange (the "NYSE") on each of the ten trading days ending on the
day that is the fifth trading day immediately preceding the Effective Date. If
the Market Value is less than $15.00 per share, then each share of InterWest
Common Stock will be converted into a number of shares of BancGroup Common Stock
equal to the quotient obtained by dividing the Market Value into the product of
$15.00 and .4714 (($15.00 X .4714) / Market Value). If the Market Value is
greater than $20.00 per share, then each share of InterWest Common Stock will be
converted into a number of shares of BancGroup Common Stock equal to the
quotient obtained by dividing the Market Value into the product of $20.00 and
 .4714 (($20.00 X .4714) / Market Value). Assuming (i) 3,088,145 shares of
InterWest Common Stock outstanding on the Effective Date, (ii) a Market Value
between $15.00 and $20.00 per share, (iii) that no InterWest shareholders
exercise dissenters' rights in the Merger and (iv) that no outstanding options
to acquire InterWest Common Stock are exercised before the Effective Date,
approximately 1,455,752 shares of BancGroup Common Stock will be issued in the
Merger. See "The Merger -- Conversion of InterWest Common Stock." BancGroup
Common Stock is listed on the NYSE. The closing price per share of the BancGroup
Common Stock on the NYSE on August 17, 1998 was $15.5625.
 
    The values, ratios and share amounts set forth in the preceding paragraph
have been adjusted pursuant to the terms of the Agreement to reflect a
two-for-one stock split effected as a 100% stock dividend paid by BancGroup on
August 14, 1998 to shareholders of record at the close of business on July 31,
1998 (the "Stock Split"). As noted throughout the Prospectus, various historical
financial information and calculations relevant to the Merger have been
similarly adjusted.
 
    Consummation of the Merger requires, among other things, the affirmative
vote of at least a majority of the outstanding shares of InterWest Common Stock.
 
    BancGroup has filed a Registration Statement pursuant to the Securities Act
of 1933, as amended (the "Securities Act"), to register the shares of the
BancGroup Common Stock to be issued in connection with the Merger. This document
constitutes a Proxy Statement of InterWest in connection with the solicitation
of proxies by InterWest for use at the Special Meeting, and any adjournments or
postponements thereof, and a Prospectus of BancGroup with respect to the
BancGroup Common Stock to be issued in the Merger. This Prospectus and
accompanying form of proxy are first being mailed to shareholders of InterWest
on or about the date set forth below.
 
           THE BOARD OF DIRECTORS OF INTERWEST UNANIMOUSLY RECOMMENDS
                           APPROVAL OF THE AGREEMENT.
                             ---------------------
 
   THE SECURITIES TO WHICH THIS PROSPECTUS RELATES HAVE NOT BEEN APPROVED OR
 DISAPPROVED BY THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
    COMMISSION, NOR HAS THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE
 SECURITIES COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS.
           ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
                             ---------------------
 
THE SHARES OF BANCGROUP COMMON STOCK OFFERED HEREBY ARE NOT SAVINGS ACCOUNTS OR
DEPOSITS AND ARE NOT INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY
                           OTHER GOVERNMENTAL AGENCY.
 
    The principal office and mailing address of InterWest are 2330 South
Virginia Street, Reno, Nevada 89502 (telephone 702-827-7233), and the principal
office and mailing address of BancGroup are Colonial Financial Center, One
Commerce Street, Post Office Box 1108, Montgomery, Alabama 36101 (telephone
334-240-5000).
 
              THE DATE OF THIS PROSPECTUS IS              , 1998.
<PAGE>   5
 
                             AVAILABLE INFORMATION
 
     BancGroup is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and in accordance
therewith files reports and other information with the Securities and Exchange
Commission (the "Commission"). Such reports and other information filed by
BancGroup, including proxy and information statements, can be inspected and
copied at the public reference facilities of the Commission, Judiciary Plaza,
450 Fifth Street, N.W., Room 1024, Washington, D.C. 20549, and at certain
regional offices: 2 World Trade Center, 13th Floor, New York, New York 10048;
Citicorp Center, 500 West Madison Street, Suite 1400, Chicago, Illinois
60661-2511; 1401 Brickell Avenue, Suite 200, Miami, Florida 33131; 1801
California Street, Suite 4800, Denver, Colorado 80202-2648; and 5670 Wilshire
Boulevard, 11th Floor, Los Angeles, California 90036-3648. Copies of such
material can be obtained from the Public Reference Section of the Commission at
450 Fifth Street, N.W., Washington, D.C. 20549, at prescribed rates.
 
     The Commission also maintains a Web site (http://www.sec.gov) that contains
reports, proxy and information statements and other information regarding
registrants, such as BancGroup, that file electronically with the Commission.
 
     The BancGroup Common Stock is listed for trading on the NYSE. Reports,
including proxy and information statements, of BancGroup and other information
may be inspected at the NYSE, 20 Broad Street, New York, New York 10005.
 
     BancGroup has filed with the Commission a Registration Statement under the
Securities Act to register the shares of BancGroup Common Stock being issued in
connection with the Merger. This Prospectus omits certain information contained
in the Registration Statement and exhibits thereto. Such Registration Statement,
including the exhibits thereto, can be inspected at the Public Reference Section
of the Commission, 450 Fifth Street, N.W., Washington, D.C. 20549, and copies of
such Registration Statement can be obtained at prescribed rates from the
Commission at that address.
 
     The information in this Prospectus concerning BancGroup and its
subsidiaries has been furnished by BancGroup, and the information concerning
InterWest and its subsidiaries has been furnished by InterWest.
 
     This Prospectus contains certain forward-looking statements with respect to
the financial condition, results of operations, and business of BancGroup
following the consummation of the Merger and the proposed acquisition of other
banking institutions (the "Other Pending Acquisitions"), including statements
relating to the expected impact of the Merger and the Other Pending Acquisitions
on BancGroup's financial performance. These forward-looking statements involve
certain risks and uncertainties. Factors that may cause actual results to differ
materially from those contemplated by such forward-looking statements include,
among other things, the following possibilities: (i) expected cost savings from
the Merger and the Other Pending Acquisitions, if any or all of such
transactions are consummated, cannot be fully realized; (ii) deposit attrition,
customer loss, or revenue loss following the Merger and the Other Pending
Acquisitions is greater than expected; (iii) competitive pressure in the banking
industry increases significantly; (iv) costs or difficulties related to the
integration of the businesses of BancGroup and the institutions to be acquired
are greater than expected; (v) changes in the interest rate environment reduce
margins; (vi) general economic conditions, either nationally or regionally, are
less favorable than expected, resulting in, among other things, a deterioration
in credit quality; (vii) changes occur in the regulatory environment; (viii)
changed occur in business conditions and the rate of inflation; and (ix) changes
occur in the securities markets. Forward looking earnings estimates (if any)
included in this Prospectus have not been examined or compiled by the
independent public accountants of BancGroup and InterWest, nor have such
accountants applied any procedures thereto. Accordingly, such accountants do not
express an opinion or any other form of assurance on them. When used in this
Prospectus, the words "believes," "estimates," "plans," "expects," "should,"
"may," "might," "outlook," and "anticipates," and similar expressions as they
relate to BancGroup (including its subsidiaries), or its management are intended
to identify forward-looking statements. Further information on other factors
that could affect the financial results of BancGroup after the Merger and the
Other Pending Acquisitions is included in the filings with the Commission
incorporated by reference herein.
 
                                      (ii)
<PAGE>   6
 
     NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS OTHER THAN THOSE CONTAINED OR INCORPORATED BY REFERENCE IN THIS
PROSPECTUS IN CONNECTION WITH THE SOLICITATION OF PROXIES OR THE OFFERING OF
SECURITIES MADE HEREBY AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATION
MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY BANCGROUP OR INTERWEST.
THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL, OR A SOLICITATION OF AN
OFFER TO BUY, ANY SECURITIES, OR THE SOLICITATION OF A PROXY, IN ANY
JURISDICTION, TO OR FROM ANY PERSON TO WHOM OR FROM WHOM IT IS UNLAWFUL TO MAKE
ANY SUCH OFFER OR SOLICITATION IN SUCH JURISDICTION. NEITHER THE DELIVERY OF
THIS PROSPECTUS NOR ANY DISTRIBUTION OF SECURITIES MADE HEREUNDER SHALL, UNDER
ANY CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE
AFFAIRS OF BANCGROUP OR INTERWEST SINCE THE DATE OF THIS PROSPECTUS OR THAT
INFORMATION IN THIS PROSPECTUS OR IN THE DOCUMENTS INCORPORATED BY REFERENCE
HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO THE DATE HEREOF OR THE DATES
THEREOF.
 
                      DOCUMENTS INCORPORATED BY REFERENCE
 
     THIS PROSPECTUS INCORPORATES DOCUMENTS OF BANCGROUP BY REFERENCE WHICH ARE
NOT PRESENTED HEREIN OR DELIVERED HEREWITH. THESE DOCUMENTS ARE AVAILABLE,
WITHOUT CHARGE, UPON REQUEST FROM THE PERSONS SPECIFIED BELOW. IN ORDER TO
ENSURE TIMELY DELIVERY OF THE DOCUMENTS, ANY REQUEST SHOULD BE RECEIVED BY
BANCGROUP NO LATER THAN FIVE BUSINESS DAYS PRIOR TO THE SPECIAL MEETING.
 
     The following documents filed by BancGroup with the Commission are hereby
incorporated by reference into this Prospectus:
 
          (1) BancGroup's Annual Report on Form 10-K for the fiscal year ended
     December 31, 1997;
 
          (2) BancGroup's Registration Statement on Form 8-A dated November 22,
     1994, effective February 22, 1995, containing a description of the
     BancGroup Common Stock.
 
          (3) BancGroup's Quarterly Reports on Form 10-Q for the quarters ended
     March 31 and June 30, 1998;
 
          (4) BancGroup's Reports on Form 8-K dated March 16, 1998, April 15,
     1998, June 2, 1998 and July 17, 1998; and
 
          (5) The description of the current management and Board of Directors
     contained in the Proxy Statement distributed pursuant to Section 14(a) of
     the Exchange Act for BancGroup's Annual Meeting of shareholders held on
     April 15, 1998.
 
     All documents filed by BancGroup pursuant to Section 13(a), 13(c), 14 or
15(d) of the Exchange Act after the date of this Prospectus and prior to the
Special Meeting, shall be deemed incorporated by reference in this Prospectus
and made a part hereof from the date of filing of such documents. Any statement
contained in a document incorporated or deemed incorporated herein by reference
will be deemed to be modified or superseded for the purpose of this Prospectus
to the extent that a statement contained herein or in another subsequently filed
document which also is, or is deemed to be, incorporated herein by reference
modifies or supersedes such statement. Any such statement so modified or
superseded will not be deemed, except as so modified or superseded, to
constitute a part of this Prospectus.
 
     BancGroup has entered into the Agreement with InterWest regarding the
Merger described herein. Various provisions of the Agreement are summarized or
referred to in this Prospectus, and the Agreement is incorporated by reference
into this Prospectus and attached hereto as Appendix A.
 
     BancGroup will provide without charge to each person, including any
beneficial owner, to whom this Prospectus is delivered, on the request of any
such person, a copy of any and all of the documents which have been incorporated
herein by reference but not delivered herewith (other than the exhibits to such
documents unless specifically incorporated herein). Such request, in writing or
by telephone, should be directed to W. Flake Oakley, IV, Secretary, The Colonial
BancGroup, Inc., One Commerce Street, Post Office Box 1108, Montgomery, Alabama
36192 (telephone 334-240-5000).
 
                                      (iii)
<PAGE>   7
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
SUMMARY.....................................................    1
THE SPECIAL MEETING.........................................   11
  General...................................................   11
  Record Date; Shares Entitled to Vote; Vote Required for
     the Merger.............................................   11
  Solicitation, Voting and Revocation of Proxies............   11
  Effect of Merger on Outstanding BancGroup Common Stock....   12
THE MERGER..................................................   13
  General...................................................   13
  Background of the Merger..................................   13
  InterWest's Board of Director's Reasons for Approving the
     Merger.................................................   13
  Recommendation of InterWest's Board of Directors..........   14
  BancGroup's Reasons for the Merger........................   14
  Interests of Certain Persons in the Merger................   14
  Conversion of InterWest Common Stock......................   15
  Surrender of InterWest Common Stock Certificates..........   16
  Certain Federal Income Tax Consequences...................   16
  Other Possible Consequences...............................   18
  Conditions to Consummation of the Merger..................   18
  Repurchase of Minority Shares.............................   19
  Amendment or Termination of Agreement.....................   20
  Regulatory Approvals......................................   20
  Conduct of Business Pending the Merger....................   23
  Rights of Dissenting Shareholders.........................   25
  Resale of BancGroup Common Stock Issued in the Merger.....   27
  Accounting Treatment......................................   28
  NYSE Reporting of BancGroup Common Stock Issued in the
     Merger.................................................   28
  Treatment of InterWest Options............................   28
COMPARATIVE MARKET PRICES AND DIVIDENDS.....................   29
  InterWest.................................................   29
BANCGROUP CAPITAL STOCK AND DEBENTURES......................   31
  BancGroup Common Stock....................................   31
  Preference Stock..........................................   31
  1986 Debentures...........................................   32
  Other Indebtedness........................................   32
  Changes in Control........................................   33
COMPARATIVE RIGHTS OF SHAREHOLDERS..........................   34
  Director Elections........................................   35
  Removal of Directors......................................   35
  Voting....................................................   35
  Preemptive Rights.........................................   35
  Directors' Liability......................................   35
  Indemnification...........................................   36
  Special Meetings of Shareholders; Action Without a
     Meeting................................................   36
  Mergers, Share Exchanges and Sales of Assets..............   37
  Amendment of Certificate of Incorporation and Bylaws......   37
</TABLE>
 
                                      (iv)
<PAGE>   8
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
  Rights of Dissenting Stockholders.........................   38
  Preferred Stock...........................................   38
  Effect of the Merger on InterWest Shareholders............   38
THE COLONIAL BANCGROUP, INC. AND SUBSIDIARIES...............   40
  Condensed Pro Forma Statements of Condition (Unaudited)...   40
INTERWEST BANCORP...........................................   53
  Selected Financial Data...................................   53
  Management's Discussion and Analysis of Financial
     Condition and Results of Operations....................   54
BUSINESS OF BANCGROUP.......................................   72
  General...................................................   72
  Recently Completed and Other Proposed Business
     Combinations...........................................   72
  Year 2000 Compliance......................................   73
  Voting Securities and Principal Stockholders..............   74
  Security Ownership of Management..........................   75
  Management Information....................................   76
BUSINESS OF INTERWEST.......................................   77
  General...................................................   77
  Deposit Activities........................................   77
  Lending Activities........................................   78
  Investments...............................................   78
  Employees.................................................   79
  Properties................................................   79
  Year 2000 Issues..........................................   79
  Legal Proceedings.........................................   80
  Principal Holders of Common Stock.........................   80
ADJOURNMENT OF SPECIAL MEETINGS.............................   80
OTHER MATTERS...............................................   81
DATE FOR SUBMISSION OF BANCGROUP STOCKHOLDER PROPOSALS......   81
LEGAL MATTERS...............................................   81
EXPERTS.....................................................   81
INDEX TO FINANCIAL STATEMENTS...............................  F-1
APPENDIX A -- Agreement and Plan of Merger..................  A-1
APPENDIX B -- Dissenter's Rights Statute....................  B-1
APPENDIX C -- Stock Option Agreement........................  C-1
</TABLE>
 
                                       (v)
<PAGE>   9
 
                                    SUMMARY
 
     The following provides a summary of certain information included in this
Prospectus. This summary is qualified in its entirety by the more detailed
information appearing elsewhere herein, the Appendices hereto and the documents
incorporated herein by reference. Shareholders of InterWest are urged to read
this Prospectus, including the Appendices, in full.
 
GENERAL
 
     This Prospectus relates to the issuance of shares of BancGroup Common Stock
in connection with the proposed Merger of InterWest with and into BancGroup.
 
THE SPECIAL MEETING
 
     This Prospectus is being furnished to the holders of InterWest Common Stock
in connection with the solicitation by the InterWest Board of Directors of
proxies for use at the Special Meeting and at any and all adjournments and
postponements thereof at which InterWest shareholders will be asked to vote upon
(i) a proposal to approve the Agreement and the Merger; and (ii) such other
business as may properly come before the meeting. The Special Meeting will be
held at 2330 South Virginia Street, on             , 1998, at 9 a.m., local
time, for the purpose of considering and voting upon the Merger and the
Agreement. Only holders of record of InterWest Common Stock at the close of
business on           ,           , 1998 (the "Record Date") are entitled to the
notice of and to vote at the Special Meeting. As of the Record Date, 3,088,145
shares of InterWest Common Stock were issued and outstanding. See "The Special
Meeting."
 
THE COMPANIES
 
     BancGroup.  BancGroup is a bank holding company within the meaning of the
Bank Holding Company Act of 1956, as amended (the "BHCA"). It was organized in
Delaware in 1974 and has operated under its current name and management since
1981. BancGroup operates a wholly owned commercial banking subsidiary, Colonial
Bank, in the states of Alabama, Florida, Georgia, Nevada and Tennessee. Colonial
Bank conducts a full service commercial banking business through 134 branches in
Alabama, five branches in Tennessee, 14 branches in Georgia, three branches in
Nevada, and 79 branches in Florida. BancGroup has also entered into agreements
to acquire four additional banks. Colonial Mortgage Company, a subsidiary of the
Colonial Bank in Alabama, is a mortgage banking company which services
approximately $14.7 billion in residential loans and which originates
residential mortgages in 34 states through four divisional offices. At June 30,
1998, BancGroup had consolidated total assets of $8.8 billion and consolidated
stockholders' equity of $601.8 million. See "Business of BancGroup."
 
     InterWest.  InterWest is a bank holding company within the meaning of the
BHCA and was incorporated on May 23, 1989. InterWest owns (i) 86.07% of the
outstanding shares of the capital stock of InterWest Bank, a Nevada banking
corporation (the "Bank"), which is headquartered in Reno, Nevada, and (ii) 100%
of the outstanding shares of the capital stock of InterWest Mortgage, a Nevada
corporation (the "Mortgage Company"). Currently, the Bank operates four banking
offices, all of which are located in Washoe and Churchill Counties, Nevada. The
Mortgage Company operates six offices which are located in Nevada, Oregon and
Idaho. At June 30, 1998, InterWest had total consolidated assets of
approximately $130.4 million, total consolidated deposits of approximately
$115.7 million, and total consolidated shareholders' equity of approximately
$7.8 million. See "Business of InterWest."
 
THE MERGER
 
     The Agreement provides for the Merger of InterWest with and into BancGroup,
with BancGroup to be the surviving corporation. Upon the date of consummation of
the Merger (the "Effective Date"), each outstanding share of InterWest Common
Stock (except shares as to which dissenters' rights are perfected) will be
converted by operation of law and without any action by any holder thereof into
0.4714 shares of BancGroup Common Stock, provided that the "Market Value" of
BancGroup Common Stock (as defined below) is neither less than $15.00 per share
nor more than $20.00 per share. The "Market Value" of
                                        1
<PAGE>   10
 
BancGroup Common Stock shall be the average of the closing prices of BancGroup
Common Stock as reported on the NYSE on each of the ten trading days ending on
the day that is the fifth trading day immediately preceding the Effective Date.
If the Market Value is less than $15.00 per share, then each share of InterWest
Common Stock will be converted into a number of shares of BancGroup Common Stock
equal to the quotient obtained by dividing the Market Value into the product of
$15.00 and .4714 (($15.00 X .4714) / Market Value). If the Market Value is
greater than $20.00 per share, then each share of InterWest Common Stock will be
converted into a number of shares of BancGroup Common Stock equal to the
quotient obtained by dividing the Market Value into the product of $20.00 and
 .4714 (($20.00 X .4714) / Market Value). Assuming (i) 3,088,145 shares of
InterWest Common Stock outstanding on the Effective Date, (ii) a Market Value
between $15.00 and $20.00 per share, (iii) that no InterWest shareholders
exercise dissenters' rights in the Merger and (iv) that no outstanding options
to acquire InterWest Common Stock are exercised before the Effective Date,
1,449,590 shares of BancGroup Common Stock will be issued in the Merger. (The
per-share values and ratios disclosed herein have been adjusted pursuant to the
terms of the Agreement to give effect to a two-for-one stock split effected as a
100% stock dividend paid by BancGroup on August 14, 1998 to shareholders of
record at the close of business on July 31, 1998 (the "Stock Split")). The
number of shares of BancGroup Common Stock to be issued in the Merger will
increase proportionally with each share of InterWest Common Stock issued
pursuant to the exercise, before the Effective Date, of certain options to
acquire InterWest Common Stock and will further increase depending upon the
number of shares of BancGroup Common Stock issued pursuant to a cashless
exchange of options to acquire InterWest Common Stock. See "The
Merger -- Interest of Certain Persons in the Merger -- Treatment of InterWest
Options".
 
     The closing sales price on the NYSE of BancGroup Common Stock on
            , 1998 was $     per share. Accordingly, had the Effective Date
occurred on             , 1998 the Market Value would have been $          and
InterWest shareholders would have received 0.4714 shares of BancGroup Common
Stock for each share of InterWest Common Stock. Shareholders are advised to
obtain current market quotations for BancGroup Common Stock. The market price of
BancGroup Common Stock at the Effective Date, or on the date on which
certificates representing such shares are received by InterWest shareholders,
may be higher or lower than the market price of BancGroup Common Stock as of the
Record Date or at the time of the Special Meeting.
 
     No fractional shares of BancGroup Common Stock will be issued in connection
with the Merger. Each shareholder of InterWest otherwise entitled to receive a
fractional share of BancGroup Common Stock will receive instead a cash payment
(without interest) equal to such fractional share multiplied by the Market
Value.
 
     Promptly after the Effective Date, InterWest shareholders will be given
notice of the consummation of the Merger and instructions for the exchange of
such shareholders' certificates representing shares of InterWest Common Stock
for certificates representing shares of BancGroup Common Stock. Certificates for
the shares of BancGroup Common Stock issued will not be distributed, and
BancGroup will not pay dividends on such shares until shareholders surrender
their certificates representing their shares of InterWest Common Stock in
accordance with those instructions. INTERWEST SHAREHOLDERS SHOULD NOT SEND IN
THEIR INTERWEST STOCK CERTIFICATES UNTIL THEY HAVE RECEIVED THE INSTRUCTIONS.
See "The Merger -- Conversion of InterWest Common Stock," "-- Surrender of
InterWest Common Stock Certificates" and "-- Treatment of InterWest Options."
 
     For certain information concerning management of BancGroup and InterWest,
see "Business of BancGroup -- Voting Securities and Principal Shareholders," "--
Security Ownership of Management," and "Business of InterWest -- Principal
Holders of Common Stock."
 
RECOMMENDATION OF INTERWEST'S BOARD OF DIRECTORS
 
     The Board of Directors of InterWest has unanimously approved the Agreement.
THE BOARD OF DIRECTORS OF INTERWEST BELIEVES THAT THE MERGER IS IN THE BEST
INTEREST OF THE SHAREHOLDERS OF INTERWEST AND RECOMMENDS THAT SHAREHOLDERS VOTE
FOR THE APPROVAL OF THE AGREEMENT. For a discussion of the factors considered by
the Board of
 
                                        2
<PAGE>   11
 
Directors in reaching its conclusions, see "The Merger -- Background of the
Merger" and " -- InterWest's Board of Director's Reasons for Approving the
Merger."
 
RELATED TRANSACTIONS -- STOCK OPTION
 
     In connection with the Agreement, InterWest has granted to BancGroup an
option to purchase up to 19.9% of the InterWest Common Stock at a purchase price
of $8.25 per share. The option will become exercisable upon the occurrence of
certain events which are generally related to the potential acquisition of
InterWest by another party. The option is intended to increase the likelihood
that the Merger will be consummated by making it more difficult and expensive
for any third party to acquire control of InterWest while BancGroup is seeking
to consummate the Merger. See "The Merger -- Related Transactions -- Stock
Option."
 
INTERESTS OF CERTAIN PERSONS IN THE MERGER
 
     As of the Record Date, InterWest has granted options to certain employees
of the Bank and the Mortgage Company which remain outstanding (the "InterWest
Options") and which entitle the holders thereof to acquire up to 80,500 shares
of InterWest Common Stock. Subject to terms of the InterWest stock option
agreements under which such options were issued, the Agreement provides that, no
later than five days prior to the Effective Date, the holders of InterWest
Options that have vested for such holders may provide written notice to
InterWest (in form and substance reasonably satisfactory to BancGroup) that they
wish to surrender their InterWest Options to BancGroup, effective at the
Effective Date and to receive in exchange therefor an amount of BancGroup Common
Stock equal in value to the difference between (i) the total value of the shares
of BancGroup Common Stock to be issued pursuant to such InterWest Options (based
upon the number of shares of BancGroup Common Stock issuable pursuant to the
InterWest Options multiplied by the Market Value) and (ii) the aggregate
exercise price of such InterWest Options at the Effective Date, divided by the
Market Value (the "Cashless Exchange"). No fractions of shares will be issued
and the value of fractional shares will be paid in cash at the Market Value. Any
InterWest Options that have not been exercised or exchanged in the Cashless
Exchange will terminate on the Effective Date. See "The Merger -- Interests of
Certain Persons in the Merger -- Treatment of InterWest Options."
 
     As a condition precedent to BancGroup's obligation to consummate the
Merger, on or before the Effective Date, each of Richard Martucci, the President
and Chief Executive Officer of InterWest, his wife, Carol Martucci, the
Secretary of InterWest, and John Donovan, the President of the Bank shall have
entered into an employment agreement with Colonial Bank. Mr. Martucci's
employment agreement will provide, among other things, that he will serve as an
executive officer of Colonial Bank's Reno Regional Bank or its western area
mortgage loan production office, or both, for a term of three years. For the
remainder of 1998 after the Effective Date, Mr. Martucci will continue to
receive a salary equal to the salary he currently receives from InterWest.
Beginning on January 1, 1999, Mr. Martucci will receive annual compensation of
$250,000 per year. He will be entitled to receive adjustments in salary and such
discretionary bonuses as Colonial Bank may grant from time to time. He will also
be permitted to participate in benefit plans of Colonial Bank for which
executive officers are eligible. Mr. Martucci will also receive a one-time
payment of $250,000 to be paid in part as an inducement for him to enter into
the employment agreement and in part as separate consideration for his agreement
not to compete with Colonial Bank or BancGroup as set forth in the employment
agreement.
 
     Mrs. Martucci's employment agreement will provide that she will serve for a
period of three years as Vice President, Human Resources, of Colonial Bank's
Reno Regional Bank. For the remainder of 1998 after the Effective Date, Mrs.
Martucci will continue to receive a salary equal to the salary she currently
receives from InterWest. Beginning on January 1, 1999, Mrs. Martucci will
receive an annual salary of $50,000. Mr. Donovan's employment agreement will
provide that he will receive $125,000 per year for a period of one year to serve
as Executive Vice President of Colonial Bank's Reno Regional Bank.
 
     Each of Richard Martucci, Carol Martucci, John Donovan and Tom Springer,
the Executive Vice President of the Mortgage Company, will be entitled to
purchase the car currently provided to him or her by
 
                                        3
<PAGE>   12
 
InterWest. The purchase price of each car will be the greater of InterWest's
then current basis in each car or its then current wholesale "Blue Book" value.
 
     On the Effective Date, and subject to the agreements described above, all
employees of InterWest will, at BancGroup's option, either become employees of
BancGroup or its subsidiaries or be entitled to severance benefits in accordance
with Colonial Bank's severance policy as of the date of the Agreement. All
employees of InterWest who become employees of BancGroup or its subsidiaries on
the Effective Date will be entitled, to the extent permitted by applicable law,
to participate in all benefit plans of BancGroup to the same extent as
BancGroup's employees.
 
     See "The Merger -- Interests of Certain Persons in the Merger."
 
VOTE REQUIRED
 
     Under Nevada law, the Agreement must be approved by the affirmative vote of
a majority of the outstanding shares of InterWest Common Stock. Each share of
InterWest Common Stock is entitled to one vote on the Agreement. Approval of the
Agreement and the Merger by BancGroup shareholders is not required under
Delaware, Nevada or other applicable law, or the rules of the NYSE on which the
BancGroup Common Stock is listed. See "The Special Meeting."
 
     Only holders of record of InterWest Common Stock at the close of business
on the Record Date are entitled to notice of and to vote at the Special Meeting.
As of such date, 3,088,145 shares of InterWest Common Stock were issued and
outstanding. As of the Record Date, the directors and executive officers of
InterWest and the Bank held approximately 99% of the outstanding shares of
InterWest Common Stock. As of the same date, the directors, executive officers
and affiliates of BancGroup held no shares of InterWest Common Stock. See "The
Special Meeting."
 
     As of the Record Date, the directors of InterWest and holders of 5% or more
of the outstanding InterWest Common Stock owned 3,053,880 shares of InterWest
Common Stock representing approximately 99% of the outstanding shares and have
agreed with BancGroup to vote their shares in favor of the Agreement. See "The
Special Meeting." As of June 30, 1998, directors and executive officers of
BancGroup beneficially owned in the aggregate 9,967,304 shares of BancGroup
Common Stock representing approximately 10.06% of BancGroup's outstanding
shares.
 
     Proxies should be returned to InterWest in the envelope enclosed herewith.
Shareholders of InterWest submitting proxies may revoke their proxies by (i)
giving notice of such revocation in writing to the Secretary of InterWest at or
prior to the Special Meeting, (ii) executing and delivering a proxy bearing a
later date to the Secretary of InterWest at or prior to the Special Meeting, or
(iii) attending the Special Meeting and voting in person. Because approval of
the Agreement requires the approval of at least a majority of the outstanding
shares of InterWest Common Stock, failure to submit a proxy or failure to vote
in person at the Special Meeting will have the same effect as a negative vote.
See "The Special Meeting -- Solicitation, Voting and Revocation of Proxies."
 
RIGHTS OF DISSENTING SHAREHOLDERS
 
     Holders of InterWest Common Stock as of the Record Date are entitled to
exercise dissenters' rights of appraisal pursuant to Section 92A.300 et seq. of
the Nevada Revised Statutes (the "NRS"). A holder of InterWest Common Stock who
complies with the provisions of applicable law relating to dissenters' rights
will be entitled to object to the Agreement and make written demand that
BancGroup pay in cash the fair value of the shares of InterWest Common Stock
held as determined in accordance with statutory provisions. Shareholders wishing
to exercise dissenters' rights of appraisal must follow exactly all requirements
for the exercise of such rights as set forth in NRS Section 92A.300 et seq., a
copy of which is attached as Appendix B to this Prospectus. Pursuant to NRS
Sections 92A.300 et seq. and assuming the Merger is consummated, a dissenting
shareholder will be entitled to receive for each share of InterWest Common Stock
as to which dissenters' rights are perfected the fair value thereof (as defined
by NRS 92A.320) together with interest as required by NRS 92A.340. See "The
Merger -- Rights of Dissenting Shareholders." Any shareholder who
 
                                        4
<PAGE>   13
 
properly exercises dissenters' rights of appraisal and receives cash for his or
her shares will encounter income tax treatment different from the treatment of
shareholders who do not exercise dissenters' rights. See "The Merger -- Certain
Federal Income Tax Consequences."
 
CONDITIONS TO THE MERGER
 
     The parties' respective obligations to consummate the Merger are subject to
the satisfaction (or waiver, to the extent permitted by law) of various
conditions set forth in the Agreement.
 
     The mutual obligations of the parties to consummate the Merger are subject
to the following conditions, among others: (i) the approval of the Agreement by
the holders of at least a majority of the outstanding shares of InterWest Common
Stock; (ii) the approval of the Merger by the Board of Governors of the Federal
Reserve System (the "Federal Reserve"), approval of the Merger by the Financial
Institutions Division of the Nevada Department of Business & Industry (the
"Nevada Division"), and approval of the merger of the Bank with Colonial Bank
(the "Bank Merger") by the Alabama Banking Department (the "Alabama
Department"), the Nevada Division, and the Federal Reserve; (iii) the absence of
any pending or threatened litigation which seeks to restrain or prohibit the
Merger; (iv) the consummation of the Merger on or before January 15, 1999; (v)
receipt of opinions of counsel as to certain matters; and (vi) receipt of an
opinion from PricewaterhouseCoopers LLP as to certain tax matters.
 
     The obligation of InterWest to consummate the Merger is further subject to
several conditions, including: (i) the absence of any material adverse changes
in the financial condition or affairs of BancGroup; and (ii) the shares of
BancGroup Common Stock to be issued under the Agreement having been approved for
listing on the NYSE.
 
     The obligations of BancGroup to consummate the Merger are subject to
various conditions, including: (i) the absence of any material adverse change in
the financial condition or affairs of InterWest; (ii) the number of shares as to
which holders of InterWest Common Stock exercise dissenters' rights not
exceeding 10% of the outstanding shares of InterWest Common Stock; (iii) the
execution and delivery by each shareholder of InterWest deemed to be an
"affiliate" of InterWest of an agreement relating to certain restrictions on
resales of BancGroup Common Stock received by such affiliates in connection with
the Merger; (iv) InterWest's having (A) purchased or redeemed outstanding shares
of the capital stock of the Bank not presently owned by InterWest (the "Minority
Shares") and owned of record by persons other than InterWest (the "Minority
Shareholders"), (B) entered into definitive agreements with the Minority
Shareholders for the purchase of the Minority Shares on or before the Effective
Date, or (C) taken or having caused the Bank to have taken all necessary and
appropriate steps as permitted under applicable law to ensure that InterWest
will, as of the Effective Date, own 100% of the outstanding capital stock of the
Bank; and (v) the receipt of a letter from PricewaterhouseCoopers LLP,
BancGroup's independent accountants, to the effect that the independent
accountants concur with the conclusions of BancGroup's and InterWest's
respective managements that no conditions exist with respect to each company
which would preclude accounting for the Merger as a pooling of interests.
 
     Applications for appropriate regulatory approvals by the Federal Reserve,
the Alabama Department, and the Nevada Division were filed with such agencies on
August 17, 1998. A notification to the Federal Reserve was also filed on this
date. On                , the Federal Reserve approved the Merger and the Bank
Merger. The approvals of the Alabama Department and the Nevada Division are
pending. No assurance can be provided that the necessary shareholder and
regulatory approvals can be obtained or that the other conditions precedent to
the Merger can or will be satisfied. BancGroup and InterWest anticipate that the
Merger will be consummated during the fourth quarter of 1998. However, delays in
the consummation of the Merger could occur.
 
     See "The Merger -- Conditions to Consummation of the Merger" and
"Regulatory Approvals."
 
                                        5
<PAGE>   14
 
AMENDMENT OR TERMINATION OF AGREEMENT
 
     To the extent permitted by law, the Agreement may be amended by a
subsequent writing signed by each of the parties upon the approval of the Boards
of Directors of each of the parties. However, under applicable law, after
adoption of the Agreement and the approval of the Merger by the holders of
InterWest Common Stock, no amendment decreasing the consideration to be received
by InterWest shareholders may be made without the further approval of such
shareholders. The Agreement may be terminated at any time prior to or on the
Effective Date, whether before or after adoption of the Agreement by the
shareholders of InterWest, by the mutual consent of the respective Boards of
Directors of InterWest and BancGroup or by the Board of Directors of either
BancGroup or InterWest under certain circumstances including, but not limited
to: (i) a material breach which cannot or has not been cured within 30 days of
notice of such breach being given by the non-breaching party; (ii) failure to
consummate the transactions contemplated under the Agreement by January 15,
1999, provided that such failure to consummate is not caused by any breach of
the Agreement by the party electing to terminate; and (iii) without further
action by either party, upon the execution by InterWest of a legally binding
agreement between InterWest and any third party with respect to any Acquisition
Proposal, provided that BancGroup will have the right to demand InterWest's
performance of the Stock Option Agreement. See "The Merger -- Related
Transactions -- Stock Option Agreement."
 
COMPARATIVE RIGHTS OF SHAREHOLDERS
 
     The rights of the holders of the InterWest Common Stock may be different
from the rights of the holders of the BancGroup Common Stock. A discussion of
these rights and a comparison thereof is set forth at "Comparative Rights of
Shareholders."
 
FEDERAL INCOME TAX CONSEQUENCES
 
     No ruling with respect to the federal income tax consequences of the Merger
to InterWest's shareholders will be requested from the Internal Revenue Service
(the "IRS"). InterWest has received an opinion from PricewaterhouseCoopers LLP
that, among other things, a shareholder of InterWest who exchanges shares of
InterWest Common Stock for BancGroup Common Stock will not recognize gain except
that, shareholders of InterWest will recognize gain to the extent such
shareholders receive cash in lieu of fractional shares of BancGroup Common
Stock. Shareholders who receive cash for their shares of InterWest Common Stock
upon perfection of dissenters' rights will realize gain or loss for federal
income tax purposes with respect to such shares. See "Approval of the
Merger -- Certain Federal Income Tax Consequences." InterWest shareholders are
urged to consult their own tax advisors as to the specific tax consequences of
the Merger to them.
 
ACCOUNTING TREATMENT
 
     The merger of InterWest into BancGroup will be treated as a
"pooling-of-interests" transaction by BancGroup for accounting purposes. See
"The Merger -- Accounting Treatment."
 
                                        6
<PAGE>   15
 
RECENT PER SHARE MARKET PRICES
 
     InterWest.  There is no established public trading market for the InterWest
Common Stock. The shares of InterWest Common Stock are not actively traded, and
such trading activity, as it occurs, takes place in privately negotiated
transactions. Management of InterWest is unaware of any transactions in shares
of InterWest that have occurred since January 1, 1996. The following table sets
forth the dividends paid on InterWest Common Stock since January 1, 1996:
 
<TABLE>
<CAPTION>
                                                              DIVIDENDS
                                                                 PER
                                                                SHARE
                                                              ---------
<S>                                                           <C>
1996
  First Quarter.............................................   $    0
  Second Quarter............................................        0
  Third Quarter.............................................        0
  Fourth Quarter............................................        0
1997
  First Quarter.............................................      .06
  Second Quarter............................................        0
  Third Quarter.............................................        0
  Fourth Quarter............................................        0
1998
  First Quarter.............................................      .02
  Second Quarter............................................        0
  Third Quarter (through             , 1998)................        0
</TABLE>
 
     BancGroup.  BancGroup Common Stock is listed for trading on the NYSE under
the symbol "CNB." The following table indicates the high and low closing prices
of the BancGroup Common Stock as reported on the NYSE since January 1, 1996.
 
<TABLE>
<CAPTION>
                                                              PRICE PER SHARE OF
                                                                COMMON STOCK(1)
                                                              -------------------
                                                               HIGH          LOW
                                                              ------        -----
<S>                                                           <C>           <C>
1996
  First Quarter.............................................    $ 9 1/8      $ 7 1/2
  Second Quarter............................................      9 1/16       7 13/16
  Third Quarter.............................................      9            7 13/16
  Fourth Quarter............................................     10 1/16       8 11/16
1997
  First Quarter.............................................     12            9 1/3
  Second Quarter............................................     12 7/16      11
  Third Quarter.............................................     14 5/8       12 1/8
  Fourth Quarter............................................     17 9/16      14 1/2
1998
  First Quarter.............................................     18 1/8       15 3/4
  Second Quarter............................................     18 13/16     14 3/4
  Third Quarter (through             , 1998)................
</TABLE>
 
- ---------------
 
(1) Restated to reflect the impact of the two-for-one stock splits effected in
    the form of a 100% stock dividend paid February 11, 1997 and August 14,
    1998.
 
                                        7
<PAGE>   16
 
     On June 16, 1998, the business day immediately prior to the public
announcement of the Merger, the closing price of the BancGroup Common Stock on
the NYSE was $29.50 per share. Giving retroactive effect to the Stock Split,
that price would have been $14.75 per share. The following table presents the
market value per share of BancGroup Common Stock on that date, and the market
value and equivalent per share value of InterWest Common Stock on that date
(giving effect to the Stock Split):
 
<TABLE>
<CAPTION>
                                                          BANCGROUP   INTERWEST   EQUIVALENT
                                                           COMMON      COMMON     PRICE PER
                                                            STOCK       STOCK     INTERWEST
                                                             (1)         (2)       SHARE(3)
                                                          ---------   ---------   ----------
<S>                                                       <C>         <C>         <C>
Comparative Market Value................................   $14.75       $2.52       $33.74
</TABLE>
 
- ---------------
 
(1) Closing price as reported by the NYSE on June 16, 1998 after giving effect
    to the Stock Split.
(2) There is no established public trading market for the shares of InterWest
    Common Stock. The value shown is the June 30, 1998 book value of a share of
    InterWest Common Stock. Management of InterWest is unaware of any
    transactions of InterWest Common Stock that have occurred since January 1,
    1996.
(3) The ten-day average of the closing price of BancGroup Common Stock,
    calculated in the same manner as the Market Value will be calculated, was
    $15.90625 on June 16, 1998. Therefore, if the Merger had closed on June 16,
    1998, and giving effect to the Stock Split, .4714 shares of BancGroup Common
    Stock would have been exchanged for each share of InterWest Common Stock.
 
     See "Comparative Market Prices and Dividends."
 
CERTAIN LEGAL RESTRICTIONS ON ACQUISITIONS OF CONTROL
 
     Certain restrictions under Delaware law prevent a person who beneficially
owns 15% or more of the BancGroup Common Stock from engaging in a "business
combination" with BancGroup unless certain conditions are satisfied. Also, the
Change in Bank Control Act of 1978 prohibits a person from acquiring "control'
of BancGroup unless certain notice requirements of the Federal Reserve have been
satisfied.
 
     BancGroup's Restated Certificate of Incorporation (the "BancGroup
Certificate") and its Bylaws (the "BancGroup Bylaws") also contain provisions
which may deter or prevent a takeover of BancGroup that is not supported by
BancGroup's Board of Directors. These provisions include: (1) a classified board
of directors, (2) supermajority voting requirements for certain "business
combinations" that exceed the provisions of Delaware law described above, (3)
flexibility for the board to consider non-economic and other factors in
evaluating a "business combination," (4) inability of shareholders to call
special meetings and act by written consent, and (5) certain advance notice
provisions for the conduct of business at shareholder meetings.
 
     See "BancGroup Capital Stock and Debentures" and "Comparative Rights of
Shareholders."
 
                                        8
<PAGE>   17
 
PER SHARE DATA
 
     The table below presents on a per share basis the book value, cash
dividends and income from continuing operations of BancGroup and InterWest on a
historical basis and on a pro forma equivalent basis assuming consummation of
the Merger. Certain information from the table has been taken from the condensed
pro forma statements of condition and income included elsewhere in this
document. The table should be read in conjunction with these pro forma
statements.
 
<TABLE>
<CAPTION>
                                                                           SIX MONTHS
                                                           SIX MONTHS         ENDED       YEAR    YEAR     YEAR
                                                              ENDED         JUNE 30,      ENDED   ENDED   ENDED
          BANCGROUP-HISTORICAL (AS RESTATED):             JUNE 30, 1998       1997*       1997    1996     1995
          -----------------------------------             -------------   -------------   -----   -----   ------
<S>                                                       <C>             <C>             <C>     <C>     <C>
Net Income
     Basic(1)...........................................      $0.43           $0.42       $0.89   $0.66   $ 0.64
     Diluted(1).........................................       0.43            0.41        0.86    0.63     0.59
Book value at end of period(1)..........................       6.13            5.27        5.76    5.12     4.69
Dividends per share:
     Common Stock(1)....................................       0.17            0.15        0.30    0.27   0.1688
     Common A**(1)......................................                                                  0.0563
     Common B**(1)......................................                                                  0.0313
INTERWEST
Net Income
  Historical:
     Basic..............................................       0.18            0.08        0.22    0.33     0.34
     Diluted............................................       0.18            0.08        0.22    0.33     0.34
  Pro forma equivalent assuming combination with
     InterWest and completed business combination(a):
     Basic..............................................       0.21            0.20        0.41    0.31     0.30
     Diluted............................................       0.20            0.19        0.40    0.30     0.28
  Pro forma equivalent assuming combination with
     InterWest, completed business combination and other
     probable business combinations(a):
     Basic..............................................       0.20            0.19        0.41    0.31     0.29
     Diluted............................................       0.20            0.19        0.40    0.30     0.27
Book value at end of period
  Historical............................................       2.52            2.23        2.37    2.22     1.89
  Pro forma equivalent assuming combination with
     InterWest and completed business combination(a)....       2.87             N/A         N/A     N/A      N/A
  Pro forma equivalent assuming combination with
     InterWest, completed business combination and other
     probable business combinations(a)..................       2.80             N/A         N/A     N/A      N/A
Dividends per share
  Historical............................................         --              --          --      --       --
  Pro forma equivalent assuming combination with
     InterWest and completed business combination(a)....       0.08            0.07        0.14    0.13     0.11
  Pro forma equivalent assuming combination with
     InterWest, completed business combination and other
     probable business combinations(b)..................       0.08            0.07        0.14    0.13     0.11
</TABLE>
 
                                        9
<PAGE>   18
 
<TABLE>
<CAPTION>
                                                                           SIX MONTHS
                                                           SIX MONTHS         ENDED       YEAR    YEAR     YEAR
                                                              ENDED         JUNE 30,      ENDED   ENDED   ENDED
          BANCGROUP-HISTORICAL (AS RESTATED):             JUNE 30, 1998       1997*       1997    1996     1995
          -----------------------------------             -------------   -------------   -----   -----   ------
<S>                                                       <C>             <C>             <C>     <C>     <C>
BANCGROUP-PRO FORMA COMBINED (INTERWEST AND COMPLETED
  BUSINESS COMBINATION):
Net Income
     Basic..............................................       0.44            0.42        0.87    0.66     0.63
     Diluted............................................       0.43            0.41        0.85    0.64     0.59
Book value at end of period.............................       6.08             N/A         N/A     N/A      N/A
BANCGROUP PRO FORMA COMBINED (INTERWEST, COMPLETED
  BUSINESS COMBINATION AND OTHER PROBABLE BUSINESS
  COMBINATIONS):
Net Income
     Basic..............................................       0.43            0.41        0.86    0.65     0.61
     Diluted............................................       0.42            0.40        0.84    0.63     0.58
Book value at end of period.............................       5.94             N/A         N/A     N/A      N/A
</TABLE>
 
- ---------------
 
<TABLE>
<C>  <S>
(1)  Restated to reflect the impact of a two-for-one stock split
     effected in the form of a 100% stock dividend paid August
     14, 1998.
  *  Restated to give effect to the June 1998
     pooling-of-interests method business combination with
     Commercial Bank of Nevada.
 **  Before February 21, 1995, BancGroup had two classes of
     common stock outstanding, Class A and Class B. Class B was
     not publicly. Class A was traded on the NASDAQ National
     Market System under the symbol of "CLBGA" until February 24,
     1995. On February 21, 1995, the Class A and Class B common
     stock were reclassified into the BancGroup Common Stock.
     Trading on the NYSE commenced on February 24, 1995.
N/A  Not applicable due to pro forma balance sheet being
     presented only at June 30, 1998 which assumes the
     transaction consummated on the latest balance sheet data in
     accordance with Rule 11.02(b) of Regulation S-X.
(a)  Pro forma equivalent per share amounts are calculated by
     multiplying the pro forma combined total income per share
     and the pro forma combined total book value per share of
     BancGroup by the conversion ratio so that the per share
     amounts are equated to the respective values for one share
     of InterWest. For these pro forma equivalent per share
     amounts, a .4714 BancGroup common stock conversion ratio is
     utilized.
(b)  Pro forma equivalent dividends per share are shown at
     BancGroup's Common Stock dividend per share rate multiplied
     by the .4714 conversion ratio per share of InterWest common
     stock (see note (a)). BancGroup presently contemplates that
     dividends will be declared in the future. However, the
     payment of cash dividends is subject to BancGroup's actual
     results of operations as well as certain other internal and
     external factors. Accordingly, there is no assurance that
     cash dividends will either be declared and paid in the
     future, or, if declared and paid, that such dividends will
     approximate the pro forma amounts indicated.
</TABLE>
 
                                       10
<PAGE>   19
 
                              THE SPECIAL MEETING
 
GENERAL
 
     This Prospectus is being furnished to the shareholders of InterWest in
connection with the solicitation of proxies by the Board of Directors of
InterWest for use at the Special Meeting and at any adjournments or
postponements thereof. The purpose of the Special Meeting is to consider and
vote upon the Agreement which provides for the proposed Merger of InterWest with
and into BancGroup. BancGroup will be the surviving corporation in the Merger.
 
     THE BOARD OF DIRECTORS OF INTERWEST BELIEVES THAT THE MERGER IS IN THE BEST
INTERESTS OF INTERWEST SHAREHOLDERS AND UNANIMOUSLY RECOMMENDS THAT SHAREHOLDERS
VOTE "FOR" THE AGREEMENT (ITEM 1 ON THE PROXY CARD).
 
     This Prospectus is also furnished by BancGroup in connection with the offer
of shares of BancGroup Common Stock to be issued in the Merger. No vote of
BancGroup shareholders is required to approve the Merger.
 
RECORD DATE; SHARES ENTITLED TO VOTE; VOTE REQUIRED FOR THE MERGER
 
     The Board of Directors of InterWest has fixed the close of business on
                 , 1998, as the Record Date for determination of shareholders
entitled to vote at the Special Meeting. There were 22 record holders of
InterWest Common Stock and 3,088,145 shares of InterWest Common Stock
outstanding, each entitled to one vote per share, as of the Record Date.
InterWest is obligated to issue up to an additional 80,500 shares of InterWest
Common Stock upon the exercise of outstanding InterWest Options.
 
     The presence at the Special Meeting, in person or by proxy, of the holders
of a majority of the outstanding shares of InterWest Common Stock on the Record
Date is necessary to constitute a quorum for the transaction of business at the
Special Meeting. In the absence of a quorum, the Special Meeting may be
postponed from time to time until InterWest shareholders holding the requisite
number of shares of InterWest Common Stock are represented in person or by
proxy. If a quorum is present, the affirmative vote of the holders of at least a
majority of the outstanding shares of InterWest Common Stock is required to
approve the Agreement. Broker non-votes and abstentions will not be counted as
votes cast "FOR" or "AGAINST" the proposal to approve the Agreement, and, as a
result, such non-votes will have the same effect as votes cast "AGAINST" the
Agreement. Each holder of record of shares of InterWest Common Stock is entitled
to cast, for each share registered in his or her name, one vote on the Agreement
as well as on each other matter presented to a vote of shareholders at the
Special Meeting.
 
     As of the Record Date, directors of InterWest and holders of 5% or more of
the outstanding InterWest Common Stock owned 3,053,880 shares of InterWest
Common Stock representing approximately 99% of the outstanding shares. These
individuals have agreed with BancGroup, subject to the effectiveness of the
Registration Statement of which this prospectus forms a part, to vote their
shares in favor of the Merger.
 
     If the Agreement is approved at the Special Meeting, InterWest is expected
to merge with and into BancGroup promptly after the other conditions to the
Agreement are satisfied. See "The Merger -- Conditions of Consummation of the
Merger."
 
     THE BOARD OF DIRECTORS OF INTERWEST URGES THE SHAREHOLDERS OF INTERWEST TO
EXECUTE AND RETURN THE ENCLOSED PROXY CARD AS SOON AS POSSIBLE AND UNANIMOUSLY
RECOMMENDS THAT THE SHARES REPRESENTED BY THE PROXY BE VOTED IN FAVOR OF THE
AGREEMENT.
 
SOLICITATION, VOTING AND REVOCATION OF PROXIES
 
     In addition to soliciting proxies by mail, directors, officers and other
employees of InterWest, without receiving special compensation therefor, may
solicit proxies from InterWest's shareholders by telephone, by telegram or in
person. Arrangements will also be made with brokerage firms and other
custodians, nominees
 
                                       11
<PAGE>   20
 
and fiduciaries, if any, to forward solicitation materials to any beneficial
owners of shares of InterWest Common Stock.
 
     InterWest will bear the cost of assembling and mailing this Prospectus and
other materials furnished to shareholders of InterWest. It will also pay all
other expenses of solicitation, including the expenses of brokers, custodians,
nominees, and other fiduciaries who, at the request of InterWest, mail material
to, or otherwise communicate with, beneficial owners of the shares held by them.
BancGroup will pay all expenses incident to the registration of the BancGroup
Common Stock to be issued in connection with the Merger.
 
     Shares of InterWest Common Stock represented by a proxy properly signed and
received at or prior to the Special Meeting, unless properly revoked, will be
voted in accordance with the instructions on the proxy. If a proxy is signed and
returned without any voting instructions, shares of InterWest Common Stock
represented by the proxy will be voted "FOR" the proposal to approve the
Agreement and in accordance with the determination of the majority of the Board
of Directors of InterWest as to any other matter which may properly come before
the Special Meeting, including any adjournment or postponement thereof. A
shareholder may revoke any proxy given pursuant to this solicitation by: (i)
delivering to the Secretary of InterWest, prior to or at the Special Meeting, a
written notice revoking the proxy; (ii) delivering to the Secretary of
InterWest, at or prior to the Special Meeting, a duly executed proxy relating to
the same shares and bearing a later date; or (iii) voting in person at the
Special Meeting. Attendance at the Special Meeting will not, in and of itself,
constitute a revocation of a proxy. All written notices of revocation and other
communications with respect to the revocation of InterWest's proxies should be
addressed to:
 
                               InterWest Bancorp
                           2330 South Virginia Street
                               Reno, Nevada 89502
       Attention: Richard Martucci, President and Chief Executive Officer
 
     Proxies marked as abstentions and shares held in street name which have
been designated by brokers on proxy cards as not voted will not be counted as
votes cast. Such proxies will, however, be counted for purposes of determining
whether a quorum is present at the Special Meeting.
 
     The Board of Directors of InterWest is not aware of any business to be
acted upon at the Special Meeting other than consideration of the Agreement and
the Merger described herein. If, however, other matters are properly brought
before the Special Meeting, or any adjournments or postponements thereof, the
persons appointed as proxies will have the discretion to vote or act on such
matters according to their best judgment. Proxies voted in favor of the approval
of the Agreement, or proxies as to which no voting instructions are given, will
be voted to adjourn the Special Meeting, if necessary, in order to solicit
additional proxies in favor of the approval of the Agreement. Proxies voted
against the approval of the Agreement and abstentions will not be voted for an
adjournment. See "Adjournment of the Special Meeting."
 
EFFECT OF MERGER ON OUTSTANDING BANCGROUP COMMON STOCK
 
     Assuming that no dissenters' rights of appraisal are exercised in the
Merger, that no InterWest Options are exercised prior to the Effective Date,
that no InterWest Options are exchanged in the Cashless Exchange, and the Market
Value of BancGroup Common Stock is between $15.00 and $20.00 per share on the
Effective Date (as of             , 1998, the ten-day closing price average
calculated in the same manner as the Market Value will be calculated was
$          ), BancGroup will issue approximately 1,455,752 shares of BancGroup
Common Stock to the shareholders of InterWest pursuant to the Merger. Based on
those assumptions, the 1,455,752 shares of BancGroup Common Stock will represent
approximately 1.46% of the total number of shares of BancGroup Common Stock
outstanding following the Merger, not counting any additional shares BancGroup
may issue, including shares to be issued pursuant to other pending acquisitions.
 
                                       12
<PAGE>   21
 
                                   THE MERGER
 
     The following sets forth a summary of the material provisions of the
Agreement and the transactions contemplated thereby. The description does not
purport to be complete and is qualified in its entirety by reference to the
Agreement, a copy of which is attached hereto as Appendix A, and certain
provisions of Nevada law relating to the rights of dissenting shareholders, a
copy of which is attached hereto as Appendix B. All InterWest shareholders are
urged to read the Agreement and the Appendices in their entirety.
 
GENERAL
 
     The Agreement provides that, subject to approval by the shareholders of
InterWest, receipt of necessary regulatory approvals and satisfaction of certain
other conditions described below at "Conditions to Consummation of the Merger,"
InterWest will merge with and into BancGroup. Upon completion of the Merger, the
corporate existence of InterWest will cease, and BancGroup will succeed to the
business formerly conducted by InterWest.
 
BACKGROUND OF THE MERGER
 
     In April of 1998, members of InterWest's Board of Directors (the "Board")
met for the purpose of analyzing the Bank's current and expected capital
position and the projected growth of the Bank's assets. The analysis showed that
the increase in capital of the Bank through retained earnings would not be
sufficient to sustain the Bank's current asset growth rate. The Board also
determined that there were insufficient assets of InterWest available to inject
capital into the Bank. The Board concluded that in order for the Bank to
continue its current asset growth rate, a stock offering or merger of InterWest
should be considered.
 
     In early May of 1998, representatives of BancGroup were referred to Mr.
Richard Martucci, President of InterWest, by a representative from another
banking institution in Nevada. Thereafter, Mr. Martucci met on May 8, 1998 with
Mr. P.L. "Mac" McLeod, Jr., President of BancGroup. On May 11, 1998, W. Flake
Oakley, IV, CFO of BancGroup, contacted Mr. Martucci and requested financial
information on InterWest and its subsidiaries for the purpose of performing
financial analyses. Between May 14, 1998 and May 20, 1998 Mr. Oakley and Mr.
Martucci had several conversations regarding a possible merger, exchange ratios,
prices per share and income requirements for Mr. and Mrs. Martucci. The
aggregate value of the proposed exchange would be approximately $26.0 million,
given BancGroup's per share price at that time of approximately $35 per share.
Each share of InterWest Common Stock would be exchanged for .2357 shares of
BancGroup Common Stock (adjusted to .4714 shares subsequent to the agreement as
a result of the Stock Split.) The proposal would be subject to a satisfactory
due diligence and approval of the Board of Directors of InterWest, a majority of
the shares of InterWest Common Stock outstanding and BancGroup.
 
INTERWEST'S BOARD OF DIRECTOR'S REASONS FOR APPROVING THE MERGER
 
     Mr. Martucci presented BancGroup's offer to the Board of Directors of
InterWest on May 14, 1998. InterWest's Board of Directors considered a number of
factors in deciding to approve the Merger and recommend the terms of the
Agreement to InterWest's shareholders. These factors included, among other
things: (i) the growth constraints that InterWest Bank had been facing would no
longer be a limiting factor if the Merger were consummated; (ii) the
consideration to be received by the shareholders of InterWest upon the
consummation of the Merger; (iii) the Merger would generally not result in the
recognition of taxable gain to InterWest shareholders who received BancGroup
Common Stock in the Merger (except to the extent that cash or property is
received by shareholders); (iv) the Merger would enable the shareholders of
InterWest to exchange their InterWest Common Stock (for which there is no
established public trading market) for BancGroup Common Stock, which is listed
on a national exchange and in which there has been an active trading market; (v)
the appeal of the BancGroup's philosophy of maintaining the community-oriented
style of banking among its acquired banks, including BancGroup's history of
maintaining local management and allowing local management a high level of
autonomy, particularly as to loan decisions; (vi) the prospect of minimal job
displacement among the Bank's and the Mortgage Company's employees; and (vii)
the impact of the Merger on the Bank and the Mortgage Company's customers and
the communities they serve.
 
                                       13
<PAGE>   22
 
     Mr. Martucci provided information on other recent mergers of financial
institutions of similar size and performance results, which supported a
conclusion that the exchange ratio being offered would be a fair price to the
shareholders of InterWest from a financial point of view. Mr. Martucci offered
validation of the price from discussions with investment advisors and published
reports of investment banking firms. Mr. Martucci also offered financial
statements of BancGroup for the Board of Director's review that revealed it's
dividend policies and payment histories. Based upon the review, the Board of
Directors of InterWest concluded that Mr. Martucci should be authorized to
proceed with finalizing the terms of the Merger Agreement.
 
RECOMMENDATION OF THE BOARD OF DIRECTORS OF INTERWEST
 
     The Board of Directors of InterWest has determined that the Merger is in
the best interest of InterWest shareholders. THE BOARD OF DIRECTORS UNANIMOUSLY
RECOMMENDS THAT THE SHAREHOLDERS OF INTERWEST VOTE IN FAVOR OF THE APPROVAL AND
ADOPTION OF THE MERGER AND THE AGREEMENT.
 
BANCGROUP'S REASONS FOR THE MERGER
 
     The Board of Directors of BancGroup has unanimously approved the Merger and
the Agreement. BancGroup recently acquired Commercial Bank of Nevada in Las
Vegas and has been seeking to expand its banking operations elsewhere in Nevada.
The acquisition of InterWest will provide BancGroup with a presence in the Reno
market area, the second largest market in Nevada and should better position
BancGroup to benefit from the rapidly expanding economy of Nevada.
 
     In approving the Merger and the Agreement, the Board of Directors of
BancGroup took into account, among other things: (i) the financial performance
and condition of InterWest, including its capital and asset quality; (ii)
similarities in the philosophies of BancGroup and InterWest, including
InterWest's commitment to delivering high quality personalized financial
services to its customers; (iii) the recent growth of the Nevada economy; and
(iv) InterWest's management's knowledge of, and experience in, the Nevada
market.
 
INTERESTS OF CERTAIN PERSONS IN THE MERGER
 
     As of the Record Date, InterWest has granted options to certain employees
of the Bank and the Mortgage Company (the "InterWest Options") which entitle the
holders thereof to acquire up to 80,500 shares of InterWest Common Stock.
Subject to terms of the InterWest stock option agreements under which such
options were issued, the Agreement provides that, no later than five days prior
to the Effective Date, the holders of InterWest Options that have vested for
such holders may provide written notice to InterWest (in form and substance
reasonably satisfactory to BancGroup) that they wish to surrender their
InterWest Options to BancGroup, effective at the Effective Date, and to receive
in exchange therefor an amount of BancGroup Common Stock equal in value to the
difference between (i) the total value of the shares of BancGroup Common Stock
to be issued pursuant to such InterWest Options (based upon the number of shares
of BancGroup Common Stock issuable pursuant to the InterWest Options multiplied
by the Market Value) and (ii) the aggregate exercise price of such InterWest
Options at the Effective Date, divided by the Market Value (the "Cashless
Exchange"). No fractions of shares will be issued and the value of fractional
shares will be paid in cash at the Market Value. Any InterWest Options that have
not vested at the Effective Date will terminate. See " -- Treatment of InterWest
Options."
 
     As a condition precedent to BancGroup's obligation to consummate the
Merger, on or before the Effective Date, each of Richard Martucci, the President
and Chief Executive Officer of InterWest, his wife, Carol Martucci, the
Secretary of InterWest, and John Donovan, the President of the Bank shall have
entered into an employment agreement with Colonial Bank. Mr. Martucci's
employment agreement will provide, among other things, that he will serve as an
executive officer of Colonial Bank's Reno Regional Bank or its western area
mortgage loan production office, or both, for a term of three years. For the
remainder of 1998 after the Effective Date, Mr. Martucci will continue to
receive a salary equal to that he currently receives from InterWest. Beginning
on January 1, 1999, Mr. Martucci will receive annual compensation of $250,000
per year. He will be entitled to receive adjustments in salary and such
discretionary bonuses as Colonial Bank may
 
                                       14
<PAGE>   23
 
grant from time to time. He will also be permitted to participate in benefit
plans of Colonial Bank for which executive officers are eligible. Mr. Martucci
will also receive a one-time payment of $250,000 to be paid in part as an
inducement for him to enter into the employment agreement and in part as
separate consideration for his agreement not to compete with Colonial Bank or
BancGroup as set forth in the employment agreement.
 
     Mrs. Martucci's employment agreement will provide that she will serve for a
period of three years as Vice President, Human Resources of Colonial Bank's Reno
Regional Bank. For the remainder of 1998 after the Effective Date, Mrs. Martucci
will continue to receive a salary equal to that she currently receives from
InterWest. Beginning on January 1, 1999, Mrs. Martucci will receive an annual
salary of $50,000. Mr. Donovan's employment agreement will provide that he will
receive $125,000 per year for a period of one year to serve as Executive Vice
President of Colonial Bank's Reno Regional Bank.
 
     Each of Richard Martucci, Carol Martucci, John Donovan and Tom Springer,
the Executive Vice President of the Mortgage Company will be entitled to
purchase the car currently provided to him or her by InterWest. The purchase
price of each car will be the greater of InterWest's then current basis in each
car or its then current wholesale "Blue Book" value.
 
     On the Effective Date, and subject to the agreements described above, all
employees of InterWest will, at BancGroup's option, either become employees of
BancGroup or its subsidiaries or be entitled to severance benefits in accordance
with Colonial Bank's severance policy as of the date of the Agreement. All
employees of InterWest who become employees of BancGroup or its subsidiaries on
the Effective Date will be entitled, to the extent permitted by applicable law,
to participate in all benefit plans of BancGroup to the same extent as
BancGroup's employees.
 
CONVERSION OF INTERWEST COMMON STOCK
 
     The Agreement provides for the Merger of InterWest with and into BancGroup,
with BancGroup to be the surviving corporation. Upon the date of consummation of
the Merger (the "Effective Date"), each outstanding share of InterWest Common
Stock (except shares as to which dissenters' rights are perfected) will be
converted by operation of law and without any action by any holder thereof into
shares of BancGroup Common Stock, provided that the "Market Value" of BancGroup
Common Stock (as defined below) is neither less than $15.00 per share nor more
than $20.00 per share. The "Market Value" of BancGroup Common Stock shall be the
average of the closing prices of BancGroup Common Stock as reported on the NYSE
on each of the ten trading days ending on the day that is the fifth trading day
immediately preceding the Effective Date. If the Market Value is less than
$15.00 per share, then each share of InterWest Common Stock will be converted
into a number of shares of BancGroup Common Stock equal to the quotient obtained
by dividing the Market Value into the product of $15.00 and .4714 (($15.00 X
 .4714) / Market Value). If the Market Value is greater than $20.00 per share,
then each share of InterWest Common Stock will be converted into a number of
shares of BancGroup Common Stock equal to the quotient obtained by dividing the
Market Value into the product of $20.00 and .4714 (($20.00 X .4714) / Market
Value). Assuming (i) 3,088,145 shares of InterWest Common Stock outstanding on
the Effective Date, (ii) a Market Value between $15.00 and $20.00 per share,
(iii) that no InterWest shareholders exercise dissenters' rights in the Merger
and (iv) that no InterWest Options are exercised before the Effective Date and
no shares of BancGroup Common Stock are issued in the Cashless Exchange,
approximately 1,455,752 shares of BancGroup Common Stock will be issued in the
Merger. (The per-share values and ratios disclosed herein have been adjusted,
pursuant to the terms of the Agreement, to give effect to the Stock Split.) The
number of shares of BancGroup Common Stock to be issued in the Merger will
increase proportionally with each share of InterWest Common Stock issued
pursuant to the exercise of InterWest Options and will further increase
depending upon the number of shares of BancGroup Common Stock issued pursuant to
a Cashless Exchange. See " -- Treatment of InterWest Options". No fractional
shares of BancGroup Common Stock will be issued in connection with the Merger.
Each shareholder of InterWest otherwise entitled to receive a fractional share
of BancGroup Common Stock will receive instead a cash payment (without interest)
equal to such fractional interest multiplied by the Market Value.
 
                                       15
<PAGE>   24
 
     As an example, if the Market Value is $          (which was the Market
Value calculated as of          , 1998), then each share of InterWest Common
Stock will be converted on the Effective Date into 0.4714 shares of BancGroup
Common Stock. As a result, a shareholder of InterWest who owns 500 shares of
InterWest Common Stock would be entitled to receive 235.7 shares of BancGroup
Common Stock (500 X 0.4714) and would actually receive 235 shares of BancGroup
Common Stock, with the .70 of a share paid in cash equal to $          (.70 X
$          ).
 
     The closing sales price on the NYSE of the BancGroup Common Stock on
          , 1998 was $     per share. Shareholders are advised to obtain current
market quotations for BancGroup Common Stock. The market price of BancGroup
Common Stock at the Effective Date, or on the date on which certificates
representing such shares are received by InterWest shareholders, may be higher
or lower than the market price of BancGroup Common Stock as of the Record Date
or at the time of the Special Meeting.
 
     The Agreement provides that if, prior to the Effective Date, BancGroup
Common Stock is changed into a different number of shares or a different class
of shares by reason of any recapitalization or reclassification, stock dividend,
combination, stock split, or reverse stock split of the BancGroup Common Stock,
an appropriate and proportionate adjustment will be made in the number of shares
of BancGroup Common Stock into which the InterWest Common Stock will be
converted in the Merger.
 
SURRENDER OF INTERWEST COMMON STOCK CERTIFICATES
 
     On the Effective Date and subject to the conditions described at
"Conditions to Consummation of the Merger," InterWest's shareholders (except
those shareholders who perfect dissenters' rights under applicable law) will
automatically, and without further action by such shareholders or by BancGroup,
become owners of BancGroup Common Stock, as described herein. Outstanding
certificates representing shares of the InterWest Common Stock will represent
shares of BancGroup Common Stock. Thereafter, upon surrender of the certificates
formerly representing shares of InterWest Common Stock, the holders will be
entitled to receive certificates for the BancGroup Common Stock. Dividends on
the shares of BancGroup Common Stock will accumulate without interest and will
not be distributed to any former shareholder of InterWest unless and until such
shareholder surrenders for cancellation his certificate for InterWest Common
Stock. SunTrust Bank, Atlanta, Atlanta, Georgia, transfer agent for BancGroup
Common Stock, will act as the Exchange Agent with respect to the shares of
InterWest Common Stock surrendered in connection with the Merger. The Exchange
Agent will mail a detailed explanation of these arrangements to InterWest
shareholders promptly following the Effective Date. Stock certificates should
not be sent to the Exchange Agent until such notice is received.
 
CERTAIN FEDERAL INCOME TAX CONSEQUENCES
 
     The Merger is intended to qualify as a "reorganization" for federal income
tax purposes under Section 368(a)(1)(A) of the Internal Revenue Code of 1986, as
amended (the "Code"). The obligation of each of InterWest and BancGroup to
consummate the Merger is conditioned on the receipt of an opinion from
PricewaterhouseCoopers LLP, BancGroup's independent public accountant, to the
effect that the Merger will constitute such a reorganization. The opinion has
been delivered to BancGroup. In delivering its opinion, PricewaterhouseCoopers
LLP, has received and relied upon certain representations contained in
certificates of officers of BancGroup and InterWest and certain other
information, data, documentation and other materials as it deemed necessary. The
tax opinion is based upon customary assumptions contained therein, including the
assumption that InterWest has no knowledge of any plan or intention on the part
of the InterWest shareholders to sell or dispose of BancGroup Common Stock that
would reduce their holdings to the number of shares having in the aggregate a
fair market value of less than 50% of the total fair market value of the
InterWest Common Stock outstanding immediately upon consummation of the Merger.
 
     Neither InterWest nor BancGroup intends to seek a ruling from the IRS as to
the federal income tax consequences of the Merger. InterWest's shareholders
should be aware that the opinion will not be binding on the IRS or the courts.
InterWest's shareholders also should be aware that some of the tax consequences
of the Merger are governed by provisions of the Code as to which there are no
final regulations and little or no
 
                                       16
<PAGE>   25
 
judicial or administrative guidance. There can be no assurance that future
legislation, administrative rulings, or court decisions will not adversely
affect the accuracy of the statements contained herein.
 
     The tax opinion states that, provided the assumptions stated therein are
satisfied, the Merger will constitute a reorganization as defined in Section
368(a) of the Code, and the following federal income tax consequences will
result to InterWest's shareholders who exchange their shares of InterWest Common
Stock for shares of BancGroup Common Stock:
 
          (i) No gain or loss will be recognized by InterWest's shareholders on
     the exchange of shares of InterWest Common Stock for shares of BancGroup
     Common Stock;
 
          (ii) The aggregate basis of BancGroup Common Stock received by each
     InterWest shareholder (including any fractional shares of BancGroup Common
     Stock deemed received, but not actually received), will be the same as the
     aggregate tax basis of the shares of InterWest Common Stock surrendered in
     exchange therefor;
 
          (iii) The holding period of the shares of BancGroup Common Stock
     received by each InterWest shareholder will include the period during which
     the shares of InterWest Common Stock exchanged therefor were held, provided
     that the shares of InterWest Common Stock were a capital asset in the
     holder's hands as of the Effective Date;
 
          (iv) Cash payments received by each InterWest shareholder in lieu of a
     fractional share of BancGroup Common Stock will be treated for federal
     income tax purposes as if the fractional share had been issued in the
     exchange and then redeemed by BancGroup. Gain or loss will be recognized on
     the redemption of the fractional share and generally will be capital gain
     or loss if the InterWest Common Stock is a capital asset in the hands of
     the holder;
 
          (v) No gain or loss will be recognized by InterWest upon the transfer
     of its assets and liabilities to BancGroup. No gain or loss will be
     recognized by BancGroup upon the receipt of the assets and liabilities of
     InterWest;
 
          (vi) The basis of the assets of InterWest acquired by BancGroup will
     be the same as the basis of the assets in the hands of InterWest
     immediately prior to the Merger;
 
          (vii) The holding period of the assets of InterWest in the hands of
     BancGroup will include the period during which such assets were held by
     InterWest;
 
          (viii) The Cashless Exchange will result in the InterWest Option
     holders recognizing ordinary income equal to the fair market value of
     BancGroup stock received in the exchange; and
 
          (ix) An InterWest shareholder who dissents and receives only cash
     pursuant to dissenters, rights will recognize gain or loss. Such gain or
     loss will, in general, be treated as capital gain or loss, measured by the
     difference between the amount of cash received and the tax basis of the
     shares of InterWest Common Stock converted, if the shares of InterWest
     Common Stock were held as capital assets. However, an InterWest shareholder
     who receives only cash may need to consider the effects of Section 302 and
     318 of the Code in determining the federal income tax consequences of the
     transaction.
 
     Each InterWest shareholder will be required to report on such shareholder's
federal income tax return for the fiscal year of such shareholder in which the
Merger occurs that such shareholder has received BancGroup Common Stock in a
reorganization.
 
     THE FOREGOING DISCUSSION IS INTENDED ONLY AS A SUMMARY OF MATERIAL FEDERAL
INCOME TAX CONSEQUENCES OF THE MERGER TO THE SHAREHOLDERS OF INTERWEST, TO
INTERWEST AND TO BANCGROUP AND DOES NOT PURPORT TO BE A COMPLETE DESCRIPTION OF
ALL POTENTIAL TAX EFFECTS OF THE MERGER. THE DISCUSSION DOES NOT ADDRESS THE TAX
CONSEQUENCES THAT MAY BE RELEVANT TO A PARTICULAR SHAREHOLDER SUBJECT TO SPECIAL
TREATMENT UNDER CERTAIN FEDERAL INCOME TAX LAWS, SUCH AS DEALERS IN SECURITIES,
BANKS, INSURANCE COMPANIES, TAX-EXEMPT ORGANIZATIONS, NON-UNITED STATES PERSONS,
STOCK-
                                       17
<PAGE>   26
 
HOLDERS WHO DO NOT HOLD THEIR SHARES OF INTERWEST COMMON STOCK AS "CAPITAL
ASSETS" WITHIN THE MEANING OF SECTION 1221 OF THE CODE, AND SHAREHOLDERS WHO
ACQUIRED THEIR SHARES OF INTERWEST COMMON STOCK PURSUANT TO THE EXERCISE OF
OPTIONS OR OTHERWISE AS COMPENSATION, NOR ANY CONSEQUENCES ARISING UNDER THE
LAWS OF ANY STATE, LOCALITY OR FOREIGN JURISDICTION. THE DISCUSSION IS BASED
UPON THE CODE, TREASURY REGULATIONS THEREUNDER AND ADMINISTRATIVE RULINGS AND
COURT DECISIONS AS OF THE DATE HEREOF. ALL OF THE FOREGOING IS SUBJECT TO
CHANGE, AND ANY SUCH CHANGE COULD AFFECT THE CONTINUING VALIDITY OF THIS
DISCUSSION. INTERWEST SHAREHOLDERS ARE URGED TO CONSULT THEIR OWN TAX ADVISORS
CONCERNING THE PARTICULAR FEDERAL, STATE, LOCAL AND FOREIGN TAX CONSEQUENCES OF
THE MERGER TO THEM.
 
OTHER POSSIBLE CONSEQUENCES
 
     If the Merger is consummated, the shareholders of InterWest, a Nevada
corporation, will become shareholders of BancGroup, a Delaware business
corporation. For a discussion of the differences, if any, in the rights,
preferences, and privileges attaching to InterWest Common Stock as compared with
BancGroup Common Stock, see "Comparative Rights of Shareholders."
 
CONDITIONS TO CONSUMMATION OF THE MERGER
 
     The parties' respective obligations to consummate the Merger are subject to
the satisfaction (or waiver, to the extent permitted by law) of various
conditions set forth in the Agreement.
 
     The obligations of InterWest and BancGroup to consummate the Merger are
conditioned upon, among other things, (i) the approval of the Agreement by the
holders of at least a majority of the outstanding shares of InterWest Common
Stock; (ii) the approval of the Merger by the Federal Reserve and the Nevada
Division, and approval of the Bank Merger by the Alabama Department, the Nevada
Division, and the Federal Reserve; (iii) the absence of pending or threatened
litigation with a view to restraining or prohibiting consummation of the Merger
or to obtain divestiture, rescission or damages in connection with the Merger;
(iv) the absence of any investigation by any governmental agency which might
result in any such proceeding; (v) consummation of the Merger no later than
January 15, 1999; and (vi) receipt of opinions of counsel regarding certain
matters.
 
     The obligation of InterWest to consummate the Merger is further subject to
several other conditions, including: (i) the absence of any material adverse
change in the financial condition or affairs of BancGroup; (ii) the shares of
BancGroup Common Stock to be issued under the Agreement shall have been approved
for listing on the NYSE; and (iii) the accuracy in all material respects of the
representations and warranties of BancGroup contained in the Agreement and the
performance by BancGroup of all of its covenants and agreements under the
Agreement.
 
     The obligation of BancGroup to consummate the Merger is subject to several
other conditions, including: (i) the absence of any material adverse change in
the financial condition or affairs of InterWest; (ii) the number of shares as to
which holders of InterWest Common Stock exercise dissenters' rights not
exceeding 10% of the outstanding shares of InterWest Common Stock; (iii) the
receipt of a letter from PricewaterhouseCoopers LLP concurring with the
conclusions of BancGroup's and InterWest's management that no conditions exist
with respect to each company which would preclude accounting for the Merger as a
pooling of interests; (iv) the accuracy in all material respects of the
representations and warranties of InterWest contained in the Agreement, and the
performance by InterWest of all of its covenants and agreements under the
Agreement; (v) InterWest's having (A) purchased or redeemed outstanding shares
of the Minority Stock and owned of record by the Minority Shareholders, (B)
entered into definitive agreements with the Minority Shareholders for the
purchase of the Minority Shares on or before the Effective Date, or (C) taken or
having caused the Bank to have taken all necessary and appropriate steps as
permitted under applicable law to ensure that InterWest will, as of the
Effective Date, own 100% of the outstanding capital
 
                                       18
<PAGE>   27
 
stock of the Bank; and (vi) the receipt by BancGroup of certain undertakings
from holders of InterWest Common Stock who may be deemed to be "affiliates" of
InterWest pursuant to the rules of the Commission. See " -- Repurchase of
Minority Shares."
 
     It is anticipated that the foregoing conditions, as well as certain other
conditions contained in the Agreement, such as the receipt of certificates of
officers of each party as to compliance with the Agreement and satisfaction of
each party of all representations, warranties and covenants, will be satisfied.
The Agreement provides that each of InterWest and BancGroup may waive all
conditions to its respective obligation to consummate the Merger, other than the
receipt of the requisite approvals of regulatory authorities and approval of the
Agreement by the shareholders of InterWest. In making any decision regarding a
waiver of one or more conditions to consummation of the Merger or an amendment
of the Agreement, the Boards of Directors of InterWest and BancGroup would be
subject to the fiduciary duty standards imposed upon such boards by relevant law
that would require such boards to act in the best interests of their respective
shareholders.
 
REPURCHASE OF MINORITY SHARES
 
     The Articles of Incorporation of the Bank authorize 250,000 shares of
common stock, without par value, of which 206,580 shares are issued and
outstanding. InterWest holds 177,802 shares or 86.07% of the issued and
outstanding common stock of the Bank. The remaining 28,778 shares or 13.93% (the
"Minority Shares") of the issued and outstanding common stock are owned by 75
individuals or trusts (the "Minority Shareholders").
 
     The Agreement contemplates a merger of subsidiaries whereby the Bank will
merge with and into Colonial Bank, a subsidiary of BancGroup, (the "Bank
Merger"). Although the timing and structure of the Bank Merger have not been
finalized, as a condition to the Merger, InterWest is required to own 100% of
the issued and outstanding stock of the Bank.
 
     TASG, Inc., dba The Alford-Spencer Financial Group of Fair Oaks,
California, was engaged by InterWest to issue an opinion on the fair value of
the Bank's common stock. In issuing its opinion, The Alford-Spencer Financial
Group considered the Merger and the effect thereof on the fair value of the
Bank's common stock. In connection with the opinion, The Alford-Spencer
Financial Group analyzed, among other things, (i) audited financial statements
for InterWest and subsidiaries for the three fiscal years ended December 31,
1997; (ii) Annual Reports to shareholders of InterWest and subsidiaries for the
period ending December 31, 1997; (iii) certain other publicly available
financial and other information concerning InterWest and subsidiaries; (iv) the
trading market for the traded securities of InterWest; and (v) publicly
available information concerning other bank and bank holding companies, the
trading market for their securities and the nature and terms of certain other
merger transactions believed relevant.
 
     In the opinion of David A. Alford, principal of The Alford-Spencer
Financial Group, the estimated value per share of the Minority Shares is $22.40
per share. The opinion of The Alford-Spencer financial Group is expressed in a
Valuation of 28,778 Shares of Capital Stock of InterWest Bank, Reno, Nevada,
dated July 10, 1998; a copy of which may be reviewed upon request at the
principal office of InterWest.
 
     Although the Bank is desirous of entering into written agreements with the
Minority Shareholders for the purchase of the Minority Shares at the fair value
established by The Alford-Spencer Financial Group, the Bank has experienced
previous communication difficulties. Many of the Minority Shareholders have
failed or refused to respond to notices or other matters. Future response or
cooperation cannot be anticipated.
 
     The Board of Directors of the Bank believes that it is in the best interest
of the Bank to consummate the Merger which will require, under the terms of the
Agreement, ownership by InterWest of 100% of the issued and outstanding stock of
the Bank. Recognizing the business purpose of the Merger, the requirements of
the Agreement, the need to act expediently to permit completion of the Merger
and the lack of communication by certain Minority Shareholders, the Board of
Directors of the Bank has resolved that, in fairness to all shareholders of the
Bank, the number of authorized shares of the common stock of the Bank should be
decreased at the ratio of 10,000 to one (the "Decrease"). The Minority
Shareholders holding fractional shares
 
                                       19
<PAGE>   28
 
of the Bank stock after the Decrease becomes effective shall receive cash in the
amount of the fair value ("Fair Value") of the Minority Shares as determined by
the Alford-Spencer Financial Group. The Decrease must be approved by the holders
of a majority of the outstanding stock of the Bank. Any Minority Shareholder who
disagrees with the Fair Value for his or her Minority Shares may dissent to the
Fair Value in accordance with NRS 92A.300 to 92A.500. See "The Merger -- Rights
of Dissenting Shareholders."
 
AMENDMENT OR TERMINATION OF AGREEMENT
 
     To the extent permitted by law, the Agreement may be amended by a
subsequent writing signed by each of the parties upon the approval of the Boards
of Directors of each of the parties. However, under applicable law after
adoption of the Agreement and the approval of Merger by the holders of InterWest
Common Stock, no amendment decreasing the consideration to be received by
InterWest shareholders may be made without the further approval of such
shareholders. The Agreement may be terminated at any time prior to or on the
Effective Date, whether before or after adoption of the Agreement by the
shareholders of InterWest, by the mutual consent of the respective Boards of
Directors of InterWest and BancGroup or by the Board of Directors of either
BancGroup or InterWest under certain circumstances including, but not limited
to: (i) a material breach which cannot or has not been cured within 30 days of
notice of such breach being given by the non-breaching party; (ii) failure to
consummate the transactions contemplated under the Agreement by January 15,
1999, provided that such failure to consummate is not caused by any breach of
the Agreement by the party electing to terminate; and (iii) without further
action by either party, upon the execution by InterWest of a legally binding
agreement between InterWest and any third party with respect to any Acquisition
Proposal, provided that BancGroup will have the right to demand payment of
liquidated damages. See "-- Related Transaction -- Stock Option."
 
REGULATORY APPROVALS
 
     Applications will be filed with the Federal Reserve pursuant to Section 3
of the BHCA and the regulations promulgated pursuant thereto, and with the
Nevada Division for their prior approval of the Merger. In addition, a
notification of the Merger will be filed with the Federal Reserve pursuant to
Section 4 of the BHCA and the regulations promulgated pursuant thereto for its
prior approval of the Merger. The approval of the Federal Reserve, the Alabama
Department, and the Nevada Division must be obtained prior to consummation of
the Bank Merger. Applications were filed with the Federal Reserve, the Alabama
Department, and the Nevada Division, and a notification was filed with Federal
Reserve, on               . The regulatory approval process is expected to take
approximately three months from this date.
 
     Federal Reserve Approval.  Pursuant to Section 3 of the BHCA, and the
regulations promulgated pursuant thereto, the approval of the Federal Reserve
must be obtained prior to the Merger. The Federal Reserve must withhold approval
of the Merger if it finds that the transaction will result in a monopoly or 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. In
addition, the Federal Reserve may not approve the Merger if it finds that the
effect thereof may be substantially to lessen competition in any section of the
country, or tend to create a monopoly, or would in any other manner be in
restraint of trade, unless it finds that the anti-competitive effects of the
Merger are clearly outweighed by the probable effect of the Merger in meeting
the convenience and needs of the communities to be served. The Federal Reserve
will also take into consideration the financial condition and managerial
resources of BancGroup, its subsidiaries, any banks related to BancGroup through
common ownership or management, and the Bank. Finally, the Federal Reserve will
consider the compliance records of BancGroup's subsidiaries under the Community
Reinvestment Act.
 
     In addition, the Federal Reserve is expressly permitted to approve
applications under Section 3 of the BHCA for a bank holding company that is
adequately capitalized and adequately managed to acquire control of a bank
located in a state other than the home state of such bank holding company (an
"Interstate Acquisition"), without regard to whether such transaction is
prohibited under the law of any state. However, if the law of the state in which
the target bank is located requires the target bank to have been in existence
for some minimum period of time, the Federal Reserve is prohibited from
approving an application by a bank
 
                                       20
<PAGE>   29
 
holding company to acquire such target bank if such target bank does not satisfy
this state law requirement, so long as the state law specifying such minimum
period of time does not specify a period of more than five years.
 
     Also, the Federal Reserve is prohibited from approving an Interstate
Acquisition if the acquiring bank holding company controls, or upon consummation
of the acquisition, would control, more than 10% of the total amount of deposits
of insured depository institutions in the United States. Finally, subject to
certain exceptions, the Federal Reserve may not approve an application
pertaining to an Interstate Acquisition if, among other things, the bank holding
company, upon consummation of the acquisition, would control 30% or more of the
total amount of deposits of insured depository institutions in the state where
the target bank is located.
 
     The BHCA provides for the publication of notice and public comment on the
application and authorizes the Federal Reserve to permit interested parties to
intervene in the proceedings. If an interested party is permitted to intervene,
such intervention could delay the regulatory approvals required for consummation
of the Merger. Section 11 of the BHCA imposes a waiting period which prohibits
the consummation of the Merger, in ordinary circumstances, for a period ranging
from 15 to 30 days following the Federal Reserve's approval of the Merger.
During such period, the United States Department of Justice, should it object to
the Merger for antitrust reasons, may challenge the consummation of the Merger.
 
     As the result of the Merger, BancGroup will acquire 100% of the outstanding
stock of the Mortgage Company, currently owned by InterWest, which engages in
permissible non-banking activities. BancGroup must file a notice of this
proposed acquisition with the Federal Reserve, and approval of the Federal
Reserve must be obtained pursuant to Section 4 of the BHCA, and regulations
promulgated pursuant thereto, prior to the Merger and BancGroup's acquisition of
the Mortgage Company which will result therefrom.
 
     The Federal Reserve is required to consider whether performance of the
activity by a bank holding company or a subsidiary of such company can
reasonably be expected to produce benefits to the public, such as greater
convenience, increased competition, or gains in efficiency, that outweigh
possible adverse effects, such as undue concentration of resources, decreased or
unfair competition, conflicts of interests, or unsound banking practices. The
Federal Reserve's consideration of these factors includes an evaluation of the
financial and managerial resources of the notificant, including its subsidiaries
and any company to be acquired, the effect of the proposed transaction on those
resources, and the management expertise, internal control and risk-management
systems, and capital of the entity conducting the activity.
 
     Pursuant to Section 18(c) of the Federal Deposit Insurance Act (the "Bank
Merger Act"), the Federal Reserve's prior approval of the Bank Merger must be
obtained. The Federal Reserve is prohibited from approving the Bank Merger if it
would result in a monopoly or would 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. In addition, the Federal Reserve is prohibited
from approving the Bank Merger if its effect, in any section of the country,
would be substantially to lessen competition, or to tend to create a monopoly,
or which in any other manner would be in restraint of trade, unless it finds
that the anti-competitive effects of the Bank Merger are clearly outweighed in
the public interest by the probable effect of the Bank Merger in meeting the
convenience and needs of the community to be served. The Federal Reserve is
required to take into consideration the financial and managerial resources and
future prospects of the existing and proposed institutions, and the con venience
and needs of the community to be served.
 
     In that the Bank Merger constitutes an interstate bank merger, certain
additional requirements are applicable to the Bank Merger. For example, the
Federal Reserve is prohibited from approving the Bank Merger if the bank
resulting from the Bank Merger, including all insured depository institutions
which are affiliates of such resulting bank, upon consummation of the
transaction, would control more than 10% of the total amount of deposits of
insured depository institutions in the United States. The Federal Reserve is
also prohibited from approving the Bank Merger if either party to the Bank
Merger has a branch in any state in which any other bank involved in the Bank
Merger has a branch, and the resulting bank, upon consummation of the Bank
Merger, would control 30% or more of the total amount of deposits of insured
depository institutions in any such state. Finally, the Federal Reserve may
approve the interstate bank merger only if each bank involved in the transaction
is adequately capitalized as of the date the application is filed, and the
Federal
                                       21
<PAGE>   30
 
Reserve determines that the resulting bank will continue to be adequately
capitalized and adequately managed upon consummation of the Bank Merger.
 
     The Bank Merger Act imposes a waiting period which prohibits consummation
of the Bank Merger, in ordinary circumstances, for a period ranging from 15 to
30 days following the Federal Reserve's approval of the Bank Merger. During such
period, the United States Department of Justice, should it object to the Merger
for antitrust reasons, may challenge the consummation of the Merger.
 
     Alabama Department Approval.  The Bank Merger must be approved by the
Alabama Department pursuant to applicable provisions of the Alabama Banking
Code. If the Superintendent of the Alabama Department finds that (1) the
proposed transaction will not be detrimental to the safety and soundness of the
bank resulting from the Bank Merger, (2) any new officers and directors of the
resulting bank are qualified by character, experience, and financial
responsibility to direct and manage the resulting bank, and (3) the proposed
Bank Merger is consistent with the convenience and needs of the communities to
be served by the resulting bank in the State of Alabama and is otherwise in the
public interest, the Bank Merger shall be approved by the Superintendent.
 
     Nevada Commissioner Approval.  Applicable provisions of the Nevada banking
statutes provide that the Merger must be approved by the Commissioner of the
Financial Institutions Division of the State of Nevada (the "Nevada Division").
In the application for approval of the Merger, the Commissioner of the Nevada
Division is required to consider BancGroup's record of compliance with the
Community Reinvestment Act of 1977, and whether the Merger will meet the needs
of those counties whose populations are less than 100,000 and whose residents
are not being adequately served by existing financial institutions. In addition,
the Commissioner is required to disapprove the Merger if he finds (a) that the
Merger would be detrimental to the safety and soundness of BancGroup, to any
institution which is a party to the Merger, or to a subsidiary or affiliate of
that institution; (b) BancGroup or its executive officers, directors or
principal stockholders have not established a record of sound performance,
efficient management, financial responsibility and integrity so that it would be
against the interest of the depositors, other customers, creditors or
stockholders of an institution, or the public to authorize the Merger; (c) the
financial condition of BancGroup or any other institution which is a participant
in the Merger might jeopardize the financial stability of BancGroup or the other
institution(s), or prejudice the interests of depositors or other customers of
BancGroup or the other institution(s); (d) the consummation of the Merger will
tend to lessen competition substantially, unless the Commissioner finds that the
anticompetitive effects of the Merger are clearly outweighed by the benefit of
meeting the convenience and needs of the relevant market to be served; or (e)
BancGroup has not established a record of meeting the needs for credit of the
communities which it or its subsidiary depository institution serves.
 
     The Nevada banking statutes also provide that the approval of the
Commissioner must be obtained prior to the Bank Merger. Upon receipt of an
application for approval of the Bank Merger, the Commissioner is required to
determine (a) whether the interests of the depositors, creditors and
stockholders or members of each depository institution are protected; (b) that
the Bank Merger is in the public interest; (c) that the Bank Merger is made for
legitimate purposes; and (d) whether Colonial Bank and the Bank have good
records of compliance with the Community Reinvestment Act of 1977. The
Commissioner is required to disapprove the Bank Merger if he finds (a) that the
Bank Merger would be detrimental to the safety and soundness of Colonial Bank,
to any institution which is a party to the Bank Merger, or to a subsidiary or
affiliate of that institution; (b) Colonial Bank or its executive officers,
directors or principal stockholders have not established a record of sound
performance, efficient management, financial responsibility and integrity so
that it would be against the interest of the depositors, other customers,
creditors, stockholders or members of an institution, or the general public to
authorize the Bank Merger; (c) the financial condition of Colonial Bank or any
other institution which is a participant in the Bank Merger might jeopardize the
financial stability of Colonial Bank or Bank, or prejudice the interests of
depositors or other customers of Colonial Bank or the Bank; (d) the consummation
of the Bank Merger will tend to lessen competition substantially, unless the
Commissioner finds that the anticompetitive effects of the Bank Merger are
clearly outweighed by the benefit of meeting the convenience and needs of the
relevant market to be served; or (e) Colonial Bank has not established a record
of meeting the needs for credit of the communities which it or its subsidiary
depository institution serves.
 
                                       22
<PAGE>   31
 
     The Agreement provides that the obligation of each of BancGroup and
InterWest to consummate the Merger is conditioned upon the receipt of all
necessary regulatory approvals. There can be no assurance that the applications
necessary for BancGroup to consummate the Merger with InterWest will be
approved, and, if such approvals are received, that such approvals will not be
conditioned upon terms and conditions that would cause the parties to abandon
the Merger.
 
     Any approval received from bank regulatory agencies reflects only their
view that the Merger does not contravene applicable competitive standards
imposed by law, and that the Merger is consistent with regulatory policies
relating to safety and soundness. THE APPROVAL OF THE BANK REGULATORY AGENCIES
IS NOT AN ENDORSEMENT OR RECOMMENDATION OF THE MERGER.
 
     BancGroup is not aware of any governmental approvals or actions that may be
required for consummation of the Merger except for the Federal Reserve, Alabama
Department and Nevada Division approvals described above. Should any such
approval or action be required, it is presently contemplated that such approval
or action would be sought.
 
CONDUCT OF BUSINESS PENDING THE MERGER
 
     The Agreement contains certain restrictions on the conduct of the business
of InterWest pending consummation of the Merger. The Agreement prohibits
InterWest from taking, without the prior written consent of BancGroup, any of
the following actions, prior to the Effective Date, subject to certain limited
exceptions previously agreed to by BancGroup and InterWest:
 
          (i) Issuing, delivering or agreeing to issue or deliver any stock,
     bonds or other corporate securities (whether authorized and unissued or
     held in the treasury), except shares of InterWest Common Stock issued upon
     the exercise of InterWest Options;
 
          (ii) Borrowing or agreeing to borrow any funds or incurring or
     becoming subject to, any liability (absolute or contingent) except
     borrowings, obligations and liabilities incurred in the ordinary course of
     business and consistent with past practice;
 
          (iii) Paying any material obligation or liability (absolute or
     contingent) other than current liabilities reflected in or shown on the
     most recent balance sheet and current liabilities incurred since that date
     in the ordinary course of business and consistent with past practice;
 
          (iv) Declaring or making or agreeing to declare or make, any payment
     of dividends or distributions of any assets of any kind whatsoever to
     shareholders, or purchasing or redeeming or agreeing to purchase or redeem,
     any of its outstanding securities except that, if the Effective Date does
     not occur before October 30, 1998, InterWest may declare and pay a cash
     dividend equal to such dividend as the Board of Directors of BancGroup may
     declare at its regular meeting presently set for October 21, 1998
     multiplied by the Exchange Ratio, as defined in the Agreement. In no event
     shall the shareholders of InterWest be entitled to payment of a dividend
     from InterWest and from BancGroup in the quarter in which the Effective
     Date occurs.
 
          (v) Except in the ordinary course of business, selling or transferring
     or agreeing to sell or transfer, any of its assets, property or rights or
     canceling, or agreeing to cancel, any debts or claims;
 
          (vi) Except in the ordinary course of business, entering or agreeing
     to enter into any agreement or arrangement granting any preferential rights
     to purchase any of its assets, property or rights or requiring the consent
     of any party to the transfer and assignment of any of its assets, property
     or rights;
 
          (vii) Waiving any rights of value which in the aggregate are material;
 
          (viii) Except in the ordinary course of business, making or permitting
     any amendment or termination of any contract, agreement or license to which
     it is a party if such amendment or termination is material considering its
     business as a whole;
 
                                       23
<PAGE>   32
 
          (ix) Except in accordance with past practice, making any accrual or
     arrangement for or payment of bonuses or special compensation of any kind
     or any severance or termination pay to any present or former officer or
     employee;
 
          (x) Except in accordance with past practice, increasing the rate of
     compensation payable to or to become payable to any of its officers or
     employees or making any material increase in any profit-sharing, bonus,
     deferred compensation, savings, insurance, pension, retirement or other
     employee benefit plan, payment or arrangement made to, for or with any of
     its officers or employees;
 
          (xi) Failing to operate its business in the ordinary course so as to
     preserve its business intact and to preserve the goodwill of its customers
     and others with whom it has business relations; and
 
          (xii) Entering into any other material transaction other than in the
     ordinary course of business.
 
     The Agreement provides that prior to the Effective Date, no director or
officer of InterWest or any of its subsidiaries shall, directly or indirectly,
own, manage, operate, join, control, be employed by or participate in the
ownership, proposed ownership, management, operation or control of or be
connected in any manner with, any business, corporation or partnership which is
competitive to the business of InterWest or its subsidiaries.
 
     The Agreement also provides that (i) at the request of BancGroup, InterWest
will consult with BancGroup and advise BancGroup in advance of all loan requests
outside the ordinary course of business or in excess of $100,000 that are not
single-family residential loan requests; and (ii) InterWest will consult with
BancGroup respecting business issues that InterWest believes should be brought
to the attention of BancGroup.
 
RELATED TRANSACTIONS -- STOCK OPTION
 
     InterWest and BancGroup have entered into a stock option agreement dated as
of June 16, 1998 (the "Option Agreement") whereby InterWest has granted to
BancGroup an option to purchase up to 614,541 shares, or 19.9% of InterWest
Common Stock at a purchase price of $8.25 per share. The Option Agreement is
attached hereto as Appendix C. Both the number of shares subject to the option
and the purchase price per option share are subject to adjustment in certain
circumstances. The Option Agreement was entered into as an inducement for, and
as a condition to, BancGroup's execution of the Agreement. The Option Agreement
is intended to increase the likelihood that the Merger will be consummated by
making it more difficult and expensive for a third party to acquire control of
InterWest.
 
     The option granted under the Option Agreement may be exercised by
BancGroup, in whole or in part, in the event a "Purchase Event" precedes the
termination of the Agreement. If the option becomes exercisable, InterWest may
be required to repurchase the option or any shares issued thereunder at a price
calculated in accordance with the Option Agreement. In addition, under certain
circumstances, the option may be converted into a similar option to acquire
shares of an entity engaging in certain transactions with InterWest.
 
     The term "Purchase Event" is defined in the Option Agreement to include:
(i) InterWest's agreement, without BancGroup's prior written consent, to effect
an "Acquisition Transaction" with any person other than BancGroup, or
InterWest's authorization, recommendation, or public proposal of (or public
announcement of its intention to authorize, recommend, or propose) such an
agreement; or (ii) the acquisition by any person of beneficial ownership of 25%
or more of the outstanding shares of InterWest Common Stock. The term
"Acquisition Transaction" is defined to include: (i) a merger, consolidation, or
other business combination involving InterWest; (ii) the disposition, by sale,
exchange, lease, or otherwise, of substantially all of the consolidated assets
of InterWest; or (iii) the issuance of securities representing 25% or more of
the voting power of InterWest.
 
     The Option Agreement and the option granted thereunder terminate upon the
earliest to occur of: (i) the Effective Date; (ii) termination of the Agreement
in accordance with its terms prior to the occurrence of a Purchase Event or a
"Preliminary Purchase Event" (generally, a tender offer or exchange offer by a
third party to acquire more than 25% of the outstanding shares of InterWest
Common Stock or the failure of InterWest's shareholders to approve the Agreement
following the public announcement of a proposed
 
                                       24
<PAGE>   33
 
Acquisition Transaction or tender offer); (iii) termination of the Agreement by
BancGroup prior to the occurrence of a Purchase Event or a Preliminary Purchase
Event for reasons other than a breach of the Agreement by InterWest or the
failure to occur of certain conditions precedent to the Merger; or (iv) the
passage of eighteen months after termination of the Agreement by BancGroup
because of a material breach of the Agreement by InterWest or the failure to
occur of certain conditions precedent to the consummation of the Merger.
 
     To the knowledge of InterWest, no event that would permit the exercise of
the option has occurred as of the date hereof. The rights and obligations of
InterWest and BancGroup under the Option Agreement are subject to receipt of any
required regulatory approval, including approval by the Federal Reserve under
the BHCA.
 
     The Option Agreement, together with InterWest's agreement not to negotiate
or entertain any proposals for the sale of InterWest or its subsidiaries to
another party (see "The Merger -- Commitments with Respect to Other Offers"),
have the effect of discouraging persons who might now, or prior to the Effective
Date, be interested in acquiring all or a significant interest in InterWest from
considering or proposing such an acquisition, even if such persons were prepared
to pay a higher price per share for the InterWest Common Stock than the price
per share to be paid by BancGroup in the Merger. The option granted to BancGroup
under the Option Agreement will become exercisable in the event of the
occurrence of certain proposals to acquire InterWest. The possibility that
BancGroup might exercise the option, and thus acquire a substantial block of
InterWest Common Stock, might deter offers of other persons or entities
interested in such an acquisition.
 
RIGHTS OF DISSENTING SHAREHOLDERS
 
     A holder of shares of InterWest is entitled to exercise the rights of a
dissenting shareholder under NRS 92A.300 et seq., to object to the Agreement and
Plan of Merger and make written demand that BancGroup pay in cash the fair value
of the shares of InterWest Stock held as determined in accordance with all
pertinent provisions of InterWest's Articles of Incorporation, Bylaws and
statutory provisions.
 
     In order to exercise dissenters' rights, a dissenting shareholder of
InterWest (a "Dissenting Shareholder") must strictly comply with the statutory
procedures of NRS 92A.300 et seq., which are summarized below. A copy of the
text provisions of these statutes is attached hereto as Appendix B. Shareholders
of InterWest are urged to read these statutes in their entirety and to consult
with their legal advisors. Nevada law requires that holders of InterWest Stock
follow certain prescribed procedures in the exercise of their statutory right to
dissent in connection with the Merger. The failure to follow such procedures on
a timely basis and in the precise manner required by Nevada law may result in a
loss of a shareholder's dissenters' rights. Pursuant to Nevada law and assuming
the Merger is consummated, a Dissenting Shareholder will be entitled to receive
for each share of InterWest Common Stock as to which dissenters' rights are
perfected the fair value thereof defined as the value of the shares immediately
before the Special Meeting approving the Merger, excluding any appreciation or
depreciation in anticipation of the Merger unless exclusion would be inequitable
(NRS 92A.320) together with interest computed from the effective date of the
Merger until the date of payment, at the average rate currently paid by
InterWest on its loans or at a rate that is fair and equitable under all the
circumstances (NRS 92A.340). The following summary does not purport to be a
complete statement of the dissenters rights provision of Nevada law and is
qualified in its entirety by reference to the full text provisions of the NRS
pertaining to dissenters rights attached hereto as Appendix B.
 
     Overview.  Holders of InterWest Common Stock have the right under Nevada
law to dissent from the Merger and obtain payment of the fair value of his or
her shares. Fair value means the value of the shares immediately before the
Special Meeting, excluding any appreciation or depreciation in anticipation of
the corporate action unless exclusion would be inequitable. If BancGroup and a
Dissenting Shareholder are not able to agree on a fair value, BancGroup must
petition a court in Washoe County, Nevada, for a determination of fair value.
 
     Procedure for Dissenting.  A shareholder wishing to dissent from the Merger
must deliver to InterWest, before the Special meeting, written notice of his or
her intent to demand payment for his or her shares if the
                                       25
<PAGE>   34
 
Merger is consummated. The written notice should be sent to InterWest at 2330
South Virginia Street, Reno, Nevada 89502, Attn: Mr. Richard Martucci, Sr., so
that InterWest receives it before the Special Meeting. A shareholder wishing to
dissent may not vote in favor of the Merger. If a shareholder's written notice
of intent to demand payment is not received by InterWest before the Special
Meeting, or if the shareholder votes in favor of the Merger, such shareholder
will not have the right to dissent and will be required to participate in the
Merger.
 
     Within 10 days after the Special Meeting, InterWest will deliver to each
Dissenting Shareholder a written notice instructing the Dissenting Shareholder
to demand payment and send his or her InterWest Common Stock certificates to
InterWest. The notice will include a copy of NRS 92A.300 et seq. and a form for
demanding payment and will show the deadline for submitting the payment demand
form and the InterWest Common Stock certificates. The form will also show the
date that the Merger was first announced to the news media or the shareholders,
and the Dissenting Shareholder will be required to state whether or not he or
she acquired his or her shares before that date.
 
     The Dissenting Shareholder must then properly complete and sign the payment
demand form, and submit it to InterWest along with his or her InterWest Common
Stock certificates by the deadline shown in the notice from InterWest. If the
payment demand form and the InterWest Common Stock certificates are not
submitted by the deadline, the shareholder will no longer be a Dissenting
Shareholder and will not be entitled to receive payment of the fair value of his
or her shares. Such a shareholder will be required to participate in the Merger.
The payment demand form and InterWest Common Stock certificate should be sent to
InterWest at 2330 South Virginia Street, Reno, Nevada 895012, Attn: Mr. Richard
Martucci, Sr.
 
     Payment for Shares.  Within 30 days after receiving a Dissenting
Shareholder's payment demand form and InterWest Common Stock certificates,
BancGroup will pay such Dissenting Shareholder, in accordance with Nevada law,
BancGroup's estimate of the fair value of the InterWest Common Stock for which
certificates were submitted, plus accrued interest. Accompanying the payment
will be financial information for InterWest as of the end of a fiscal year
ending not more than 16 months before the date of payment, and for the year then
ended, as well as the latest available interim financial information. Also
accompanying the payment will be a statement of BancGroup's estimate of the fair
value of the shares, an explanation of how the interest was calculated, a
statement of the Dissenting Shareholder's rights to demand additional payment
and a copy of the relevant Nevada statutes. BancGroup's obligation to pay fair
value may be enforced by a court. However, if the Dissenting Shareholder did not
own the shares before the date the Merger was first announced to the news media
or to the shareholders, BancGroup will have the right to withhold payment, and
instead to offer to pay BancGroup's estimate of the fair value of the shares.
Such an offer will be accompanied by a statement of BancGroup's estimate of the
fair value of the shares, an explanation of how the interest was calculated and
a statement of the Dissenting Shareholder's rights to demand payment.
 
     If a Dissenting Shareholder estimates the fair value of his or her shares
and the amount of accrued interest to be higher than the amount paid by
BancGroup, the Dissenting Shareholder may send a notice to BancGroup demanding
payment of the difference between the Dissenting Shareholder's estimate and the
amount paid by BancGroup. Or, if the Dissenting Shareholder was only entitled to
receive BancGroup's offer to pay fair value, the Dissenting Shareholder may
reject the offer and demand payment of the Dissenting Shareholder's estimate of
the fair value of his or her shares and accrued interest. If a Dissenting
Shareholder does not send a notice demanding payment within 30 days after
BancGroup has made its payment or offer, the Dissenting Shareholder will not
have the right to receive any amount in excess of the fair value plus interest
already paid or offered by BancGroup.
 
     Court Proceeding to Determine Fair Value.  If a demand for payment remains
unsettled for 60 days following InterWest's receipt of the demand, BancGroup
will petition a court in Washoe County to determine the fair value of the shares
and accrued interest. Court costs will be paid by BancGroup unless the court
finds that one or more Dissenting Shareholders acted arbitrarily, vexatiously or
not in good faith in demanding payment, in which case some or all court costs
may be allocated to such Dissenting Shareholder or Shareholders. Attorneys' and
experts' fees may be assessed against BancGroup if the court finds that
BancGroup did not comply with the applicable statute or acted arbitrarily,
vexatiously or not in good faith, or
 
                                       26
<PAGE>   35
 
such fees may be assessed against one or more Dissenting Shareholders if the
same acted arbitrarily, vexatiously or not in good faith.
 
     Holders of InterWest Common Stock considering seeking appraisal by
exercising their dissenters' rights should be aware that the fair value of their
InterWest Common Stock determined pursuant to Nevada law could be more than, the
same as, or less than the value of the securities that they are entitled to
receive pursuant to the Merger Agreement if they do not seek appraisal of their
InterWest Common Stock.
 
     THE FOREGOING DOES NOT PURPORT TO BE A COMPLETE STATEMENT OF THE PROCEDURES
TO BE FOLLOWED BY HOLDERS OF INTERWEST COMMON STOCK DESIRING TO EXERCISE
APPRAISAL RIGHTS, AND, IN VIEW OF THE FACT THAT EXERCISE OF SUCH RIGHTS REQUIRES
STRICT ADHERENCE TO THE RELEVANT PROVISIONS OF THE NEVADA GENERAL CORPORATION
LAWS, EACH SHAREHOLDER WHO MAY DESIRE TO EXERCISE APPRAISAL RIGHTS IS ADVISED
INDIVIDUALLY TO CONSULT THE LAW (AS SET FORTH IN APPENDIX B HERETO) AND COMPLY
WITH THE PROVISIONS THEREOF.
 
     HOLDERS OF THE INTERWEST COMMON STOCK WISHING TO EXERCISE DISSENTERS'
RIGHTS ARE ADVISED TO CONSULT THEIR OWN COUNSEL TO ENSURE THAT THEY FULLY AND
PROPERLY COMPLY WITH THE REQUIREMENTS OF NEVADA LAW.
 
     The foregoing discussion is only a summary of the provisions of Nevada law,
does not purport to be complete and is qualified in its entirety by reference to
NRS 92A.300 et seq., which is attached hereto as Appendix B. Any shareholder who
intends to dissent from the Merger should review the text of NRS 92A.300 et seq.
carefully and should also consult with his or her attorney. Any shareholder who
fails to follow strictly the procedures set forth in said statute will forfeit
dissenters' rights.
 
     Any Dissenting Shareholder who perfects his or her right to be paid the
value of his or her shares will recognize gain or loss, if any, for federal
income tax purposes upon the receipt of cash for such shares. The amount of gain
or loss and its character as ordinary or capital gain or loss will be determined
in accordance with applicable provisions of the code. See " -- Certain Federal
Income Tax Consequences."
 
     BECAUSE OF THE COMPLEXITY OF THE PROVISIONS OF THE NEVADA LAW RELATING TO
DISSENTERS' APPRAISAL RIGHTS, SHAREHOLDERS WHO ARE CONSIDERING DISSENTING FROM
THE MERGER ARE URGED TO CONSULT WITH THEIR OWN LEGAL ADVISERS.
 
     Any Dissenting Shareholder who perfects his or her right to be paid the
value of his or her shares will recognize gain or loss, if any, for federal
income tax purposes upon the receipt of cash for such shares. The amount of gain
or loss and its character as ordinary or capital gain or loss will be determined
in accordance with applicable provisions of the Code. See "-- Certain Federal
Income Tax Consequences."
 
     BECAUSE OF THE COMPLEXITY OF THE PROVISIONS OF THE NEVADA LAW RELATING TO
DISSENTERS' APPRAISAL RIGHTS, SHAREHOLDERS WHO ARE CONSIDERING DISSENTING FROM
THE MERGER ARE URGED TO CONSULT THEIR OWN LEGAL ADVISERS.
 
RESALE OF BANCGROUP COMMON STOCK ISSUED IN THE MERGER
 
     The issuance of the shares of BancGroup Common Stock pursuant to the Merger
(including any shares to be issued pursuant to InterWest Options) has been
registered under the Securities Act of 1933 (the "Securities Act"). As a result,
shareholders of InterWest who are not "affiliates" of InterWest (as such term is
defined under the Securities Act) may resell, without restriction, all shares of
BancGroup Common Stock which they receive in connection with the Merger. Under
the Securities Act, only affiliates of InterWest are subject to restrictions on
the resale of the BancGroup Common Stock which they receive in the Merger.
 
     The BancGroup Common Stock received by affiliates of InterWest who do not
also become affiliates of BancGroup after the consummation of the Merger may not
be sold except pursuant to an effective registration statement under the
Securities Act covering such shares or in compliance with Rule 145 under the
Securities Act or another applicable exemption from the registration
requirements of the Securities Act. Generally,
                                       27
<PAGE>   36
 
Rule 145 permits BancGroup Common Stock held by such shareholders to be sold in
accordance with certain provisions of Rule 144 under the Securities Act. In
general, these provisions of Rule 144 permit a person to sell on the open market
in brokers or certain other transactions within any three-month period a number
of shares that does not exceed the greater of 1% of the then outstanding shares
of BancGroup Common Stock or the average weekly trading volume in BancGroup
Common Stock reported on the NYSE during the four calendar weeks preceding such
sale. Sales under Rule 144 are also subject to the availability of current
public information about BancGroup. The restrictions on sales will cease to
apply under most circumstances once the former InterWest affiliate has held the
BancGroup Common Stock for at least one year. BancGroup Common Stock held by
affiliates of InterWest who become affiliates of BancGroup, if any, will be
subject to additional restrictions on the ability of such persons to resell such
shares.
 
     InterWest will provide BancGroup with such information as may be reasonably
necessary to determine the identity of those persons (primarily officers,
directors and principal shareholders) who may be deemed to be affiliates of
InterWest. InterWest will also obtain from each such person a written
undertaking to the effect that no sale or transfer will be made of any shares of
BancGroup Common Stock by such person except pursuant to Rule 145 or pursuant to
an effective registration statement or an exemption from registration under the
Securities Act. Receipt of such an undertaking is a condition to BancGroup's
obligation to close the Merger. The undertaking also will require each affiliate
to agree that such person will not sell or otherwise reduce risk relative to any
shares of BancGroup Common Stock received in the Merger until financial results
concerning at least 30 days of post-Merger combined operations have been
published by BancGroup within the meaning of Section 201.01 of the Commission's
Codification of Financial Reporting Policies. If such undertakings are not
received and BancGroup waives receipt of such condition, the certificates for
the shares of BancGroup Common Stock to be issued to such person will contain an
appropriate restrictive legend and appropriate stock transfer orders will be
given to BancGroup's stock transfer agent.
 
ACCOUNTING TREATMENT
 
     BancGroup will account for the Merger as a pooling-of-interests transaction
in accordance with generally accepted accounting principles, which, among other
things, require that the number of shares of InterWest Common Stock acquired for
cash pursuant to the exercise of dissenters' rights or in lieu of fractional
shares not exceed 10% of the outstanding shares of InterWest Common Stock. Under
this accounting treatment, assets and liabilities of InterWest would be added to
those of BancGroup at their recorded book values, and the shareholders' equity
of the two companies would be combined in BancGroup's consolidated balance
sheet. Financial statements of BancGroup issued after the Effective Date of the
Merger may be restated to reflect the consolidated operations of BancGroup and
InterWest as if the Merger had taken place prior to the periods covered by the
financial statements.
 
NYSE REPORTING OF BANCGROUP COMMON STOCK ISSUED IN THE MERGER
 
     Sales of BancGroup Common Stock to be issued in the Merger in exchange for
InterWest Common Stock will be reported on the NYSE.
 
TREATMENT OF INTERWEST OPTIONS
 
     As of the Record Date, InterWest had granted options to certain employees
of the Bank and the Mortgage Company which entitled the holders thereof to
acquire up to 80,500 shares of InterWest Common Stock. The Agreement provides
that, no later than five days prior to the Effective Date, the holders of
InterWest Options that have vested for such holders may provide written notice
to InterWest (in form and substance reasonably satisfactory to BancGroup) that
they wish to surrender their InterWest Options to BancGroup, effective at the
Effective Date and to receive in exchange therefor an amount of BancGroup Common
Stock equal in value to the difference between (i) the total value of the shares
of BancGroup Common Stock to be issued pursuant to such InterWest Options (based
upon the number of shares of BancGroup Common Stock issuable pursuant to the
InterWest Options multiplied by the Market Value) and (ii) the aggregate
exercise price of such InterWest Options at the Effective Date, divided by the
Market Value. (the "Cashless Exchange"). No fractions of shares will be issued
and fractions will be paid in cash at
                                       28
<PAGE>   37
 
the Market Value. Any InterWest Options that have not been exercised or
exchanged as provided above at the Effective Date will terminate.
 
     The InterWest Options are issued pursuant to InterWest's Incentive Stock
Option Plan (the "Option Plan"). The Option Plan is not qualified under Section
401 of the Code, nor is it subject to the Employee Retirement Income Security
Act of 1974. InterWest Options are not transferable except under the laws of
descent and distribution. No further options will be granted under the InterWest
Option Plan after the Merger. A total of 18 persons currently hold InterWest
Options.
 
     Options issued under the Option Plan may qualify as "Incentive Stock
Options," under Section 422 of the Code. If such options so qualify under the
Code, no income will result to a grantee of any such option upon the exercise of
an option, and BancGroup will not be entitled to a tax deduction by reason of
such exercise. If, after exercising the option, the employee holds the stock
obtained through exercise for at least two years after the date of option grant
and at least one year after the stock was obtained, the employee's gain (if any)
on selling the stock will generally be treated as a long term capital gain.
Generally, the employee's alternative minimum taxable income for minimum tax
purposes will be increased by the difference between the option price and the
fair market value of the stock on the date of exercise.
 
     If the holding period requirements set forth above are not met, then any
gain on the sale of the stock will be taxed partly or entirely at ordinary
income rates. If the stock is held for less than the required holding periods,
then the difference between the option exercise price and the fair market value
of the stock on the date of exercise will be taxed at ordinary income tax rates.
The gain equal to the increase in the fair market value of the stock after the
date of exercise of the option will generally be taxed as capital gain. It
should be understood that the holding periods discussed above relate only to
federal income tax treatment and not to any securities law restrictions that may
apply to the sale of shares obtained through an option.
 
     As discussed under "-- Certain Federal Income Tax Consequences," employees
who utilize the Cashless Exchange will recognize ordinary income equal to the
fair market value of BancGroup stock received in the exchange. See "-- Certain
Federal Income Tax Consequences."
 
                    COMPARATIVE MARKET PRICES AND DIVIDENDS
 
INTERWEST
 
     There is no established public trading market for the InterWest Common
Stock. The shares of InterWest Common Stock are not actively traded, and such
trading activity, as it occurs, takes place in privately negotiated
transactions.
 
                                       29
<PAGE>   38
 
Management of InterWest is not aware of any transactions in shares of InterWest
that have occurred since January 1, 1996. The following table sets forth the
dividends paid on InterWest Common Stock since January 1, 1996:
 
<TABLE>
<CAPTION>
                                                             PRICE PER SHARE OF
                                                                COMMON STOCK
                                                             -------------------   DIVIDENDS
                                                               HIGH       LOW      PER SHARE
                                                             --------   --------   ----------
<S>                                                          <C>        <C>        <C>
1996
  First Quarter............................................                          $    0
  Second Quarter...........................................                               0
  Third Quarter............................................                               0
  Fourth Quarter...........................................                               0
1997
  First Quarter............................................                             .06
  Second Quarter...........................................                               0
  Third Quarter............................................                               0
  Fourth Quarter...........................................                               0
1998
  First Quarter............................................                             .02
  Second Quarter...........................................                               0
  Third Quarter (through             , 1998)...............                               0
</TABLE>
 
     BancGroup.  BancGroup Common Stock is listed for trading on the NYSE under
the symbol "CNB." The following table indicates the high and low closing prices
of the BancGroup Common Stock as reported on the NYSE since January 1, 1996.
 
<TABLE>
<CAPTION>
                                                                  PRICE PER
                                                                  SHARE OF
                                                               COMMON STOCK(1)
                                                              -----------------      DIVIDENDS
                                                               HIGH        LOW       PER SHARE
                                                              ------      -----      ----------
<S>                                                           <C>         <C>        <C>
1996
  First Quarter.............................................    $ 9 1/8   $ 7 1/2      $.068
  Second Quarter............................................      9 1/16    7 13/16     .068
  Third Quarter.............................................      9         7 13/16     .068
  Fourth Quarter............................................     10 1/16    8 11/16     .068
1997
  First Quarter.............................................     12         9 1/3       .075
  Second Quarter............................................     12 7/16   11           .075
  Third Quarter.............................................     14 5/8    12 1/8       .075
  Fourth Quarter............................................     17 9/16   14 1/2       .075
1998
  First Quarter.............................................     18 1/8    15 3/4       .085
  Second Quarter............................................     18 13/16  14 3/4       .085
  Third Quarter (through             , 1998)................
</TABLE>
 
- ---------------
 
(1) Restated to reflect the impact of the two-for-one stock splits effected in
    the form of a 100% stock dividend paid February 11, 1997 and August 14,
    1998.
 
     On June 16, 1998, the business day immediately prior to the public
announcement of the Merger, the closing price of the BancGroup Common Stock on
the NYSE was $14.75 per share after giving effect to the Stock Split.
 
     At December 31, 1997, BancGroup's subsidiaries accounted for approximately
98% of BancGroup's consolidated assets. BancGroup derives substantially all of
its income from dividends received from its subsidiaries. Various statutory
provisions and regulatory policies limit the amount of dividends the subsidiary
 
                                       30
<PAGE>   39
 
banks may pay without regulatory approval. In addition, federal statutes
restrict the ability of subsidiary banks to make loans to BancGroup, and
regulatory policies may also restrict such dividends.
 
                     BANCGROUP CAPITAL STOCK AND DEBENTURES
 
     BancGroup's authorized capital stock consists of 200,000,000 shares of
BancGroup Common Stock, par value $2.50 per share, and 1,000,000 shares of its
Preference Stock, par value $2.50 per share. As of June 30, 1998, and giving
effect to the Stock Split, there were issued and outstanding a total of
98,232,266 shares of BancGroup Common Stock. No shares of Preference Stock are
issued and outstanding. BancGroup issued in 1986 $28,750,000 in principal amount
of its 7 1/2% Convertible Subordinated Debentures due 2011 (the "1986
Debentures") of which $3,845,672 were outstanding as of June 30, 1998 and
convertible at any time into 549,382 shares of BancGroup Common Stock, subject
to adjustment. As of June 30, 1998 there were 3,858,122 shares of BancGroup
Common Stock subject to issue upon exercise of options under BancGroup's stock
option plans. In addition to BancGroup Common Stock to be issued in the Merger,
BancGroup will issue additional shares of BancGroup Common Stock in pending
business combinations. On January 20, 1997, BancGroup issued, through a special
purpose trust, $70 million of Trust Preferred Securities, all of which was
outstanding at June 30, 1998.
 
     The following statements with respect to BancGroup Common Stock and
Preference Stock are brief summaries of material provisions of Delaware law, the
Restated Certificate of Incorporation (the "BancGroup Certificate"), as amended,
and Bylaws of BancGroup, do not purport to be complete and are qualified in
their entirety by reference to the foregoing.
 
BANCGROUP COMMON STOCK
 
     Dividends.  Subject to the rights of holders of Preference Stock, if any,
to receive certain dividends prior to the declaration of dividends on shares of
BancGroup Common Stock, when and as dividends, payable in cash, stock or other
property, are declared by the BancGroup Board of Directors, the holders of
BancGroup Common Stock are entitled to share ratably in such dividends.
 
     Voting Rights.  Each holder of BancGroup Common Stock has one vote for each
share held on matters presented for consideration by the stockholders.
 
     Preemptive Rights.  The holders of BancGroup Common Stock have no
preemptive rights to acquire any additional shares of BancGroup.
 
     Issuance of Stock.  The BancGroup Certificate authorizes the Board of
Directors of BancGroup to issue authorized shares of BancGroup Common Stock
without stockholder approval. However, BancGroup's Common Stock is listed on the
NYSE, which requires stockholder approval of the issuance of additional shares
of BancGroup Common Stock under certain circumstances.
 
     Liquidation Rights.  In the event of liquidation, dissolution or winding-up
of BancGroup, whether voluntary or involuntary, the holders of BancGroup Common
Stock will be entitled to share ratably in any of its assets or funds that are
available for distribution to its stockholders after the satisfaction of its
liabilities (or after adequate provision is made therefor) and after preferences
of any outstanding Preference Stock.
 
PREFERENCE STOCK
 
     The Preference Stock may be issued from time to time as a class without
series, or if so determined by the Board of Directors of BancGroup, either in
whole or in part in one or more series. The voting rights, and such
designations, preferences and relative, participating, optional or other special
rights, if any, and the qualifications, limitations or restrictions thereof, if
any, including, but not limited to, the dividend rights, conversion rights,
redemption rights and liquidation preferences, if any, of any wholly unissued
series of
 
                                       31
<PAGE>   40
 
Preference Stock (or of the entire class of Preference Stock if none of such
shares has been issued), the number of shares constituting any such series and
the terms and conditions of the issue thereof may be fixed by resolution of the
Board of Directors of BancGroup. Preference Stock may have a preference over the
BancGroup Common Stock with respect to the payment of dividends and the
distribution of assets in the event of the liquidation or winding-up of
BancGroup and such other preferences as may be fixed by the Board of Directors
of BancGroup.
 
1986 DEBENTURES
 
     BancGroup issued the 1986 Debentures in the total principal amount of
$28,750,000. The 1986 Debentures were issued under a trust indenture (the "1986
Indenture") between BancGroup and SunTrust Bank, Atlanta, Atlanta, Georgia, as
trustee.
 
     The 1986 Debentures will mature on March 31, 2011, and are convertible at
any time into shares of BancGroup Common Stock at the option of a holder
thereof, at the conversion price of $7 principal amount of the 1986 Debentures
for each share of BancGroup Common Stock. The conversion price is, however,
subject to adjustment upon the occurrence of certain events as described in the
1986 Indenture. In the event all of the outstanding 1986 Debentures are
converted into shares of BancGroup Common Stock in accordance with the 1986
Indenture, as of June 30, 1998 approximately 549,382 shares of such BancGroup
Common Stock will be issued. The 1986 Debentures are redeemable, in whole or in
part, at the option of BancGroup at certain premiums until 1996, when the
redemption price shall be equal 100% of the face amount of the 1986 Debentures
plus accrued interest. The payment of principal and interest on the 1986
Debentures is subordinate, to the extent provided in the 1986 Indenture, to the
prior payment when due of all Senior Indebtedness of BancGroup. "Senior
Indebtedness" is defined as any indebtedness of BancGroup for money borrowed, or
any indebtedness incurred in connection with an acquisition or with a merger or
consolidation, outstanding on the date of execution of the 1986 Indenture as
originally executed, or thereafter created, incurred or assumed, and any
renewal, extension, modification or refunding thereof, for the payment of which
BancGroup (which term does not include BancGroup's consolidated or
unconsolidated subsidiaries) is at the time of determination responsible or
liable as obligor, guarantor or otherwise. Senior Indebtedness does not include
(i) indebtedness as to which, in the instrument creating or evidencing the same
or pursuant to which the same is outstanding, it is provided that such
indebtedness is subordinate in right of payment to any other indebtedness of
BancGroup, and (ii) indebtedness which by its terms states that such
indebtedness is subordinate to or equally subordinate with the 1986 Debentures.
 
     At December 31, 1997, BancGroup's Senior Indebtedness as defined in the
1986 Indenture aggregated approximately $1.1 billion. Such debt includes all
short-term debt consisting of federal funds purchased, securities purchased
under repurchase agreements and borrowings with the Federal Home Loan Bank but
excludes all federally-insured deposits. BancGroup may from time to time incur
additional indebtedness constituting Senior Indebtedness. The 1986 Indenture
does not limit the amount of Senior Indebtedness which BancGroup may incur, nor
does such indenture prohibit BancGroup from creating liens on its property for
any purpose.
 
OTHER INDEBTEDNESS
 
     On January 29, 1997, BancGroup issued, through a special purpose trust, $70
million of Trust Preferred Securities. The securities bear interest at 8.92% and
are subject to redemption in whole or in part any time after January 2007
through January 2027. It is unlikely that redemption will occur prior to
maturity. The securities are subordinated to substantially all of BancGroup's
indebtedness. In BancGroup's consolidated statement of condition, these
securities are shown as long-term debt.
 
     On February 5, 1998, BancGroup consummated a merger with ASB Bancshares,
Inc., a Delaware corporation ("ASB"). As part of the consideration for the
common stock of ASB, BancGroup issued debentures to three ASB shareholders. The
aggregate principal amount of these debentures is $7,724,813. The debentures pay
a rate of interest equal to the New York Prime Rate minus 1% (but in no event
less than 7% per annum) and are due and payable ten years from the date of
issuance. They are senior to the BancGroup
 
                                       32
<PAGE>   41
 
Common Stock upon liquidation, but are subordinate to BancGroup's Senior
Indebtedness. See "-- BancGroup Capital Stock and Debentures." The debentures
are redeemable by BancGroup with the consent of the holders thereof. A holder of
a debenture may, subject to BancGroup's right to decline, request redemption of
any or all of the debentures held by him or her.
 
CHANGES IN CONTROL
 
     Certain provisions of the BancGroup Certificate and the BancGroup Bylaws
may have the effect of preventing, discouraging or delaying any change in
control of BancGroup. The authority of the BancGroup Board of Directors to issue
BancGroup Preference Stock with such rights and privileges, including voting
rights, as it may deem appropriate may enable BancGroup's Board of Directors to
prevent a change in control despite a shift in ownership of the BancGroup Common
Stock. See "General" and "Preference Stock." In addition, the power of
BancGroup's Board of Directors to issue additional shares of BancGroup Common
Stock may help delay or deter a change in control by increasing the number of
shares needed to gain control. See "BancGroup Common Stock." The following
provisions also may deter any change in control of BancGroup.
 
     Classified Board.  BancGroup's Board of Directors is classified into three
classes, as nearly equal in number as possible, with the members of each class
elected to three-year terms. Thus, one-third of BancGroup's Board of Directors
is elected by stockholders each year. With this provision, two annual elections
are required in order to change a majority of the Board of Directors. There are
currently 23 directors of BancGroup. This provision of the BancGroup Certificate
also stipulates that (i) directors can be removed only for cause upon a vote of
80% of the voting power of the outstanding shares entitled to vote in the
election of directors, voting as a class, (ii) vacancies in the Board of
Directors may only be filled by a majority vote of the directors remaining in
office, (iii) the maximum number of directors shall be fixed by resolution of
the Board of Directors, and (iv) the provisions relating to the classified Board
of Directors can only be amended by the affirmative vote of the holders of at
least 80% of the voting power of the outstanding shares entitled to vote in the
election of directors, voting as a class.
 
     Business Combinations.  Certain "Business Combinations" of BancGroup with a
"Related Person" may only be undertaken with the affirmative vote of at least
75% of the outstanding shares of "Voting Stock," plus the affirmative vote of at
least 67% of the outstanding shares of Voting Stock, not counting shares owned
by the Related Person, unless the Continuing Directors of BancGroup approve such
Business Combination. A "Related Person" is a person, or group, who owns or
acquires 10% or more of the outstanding shares of BancGroup Common Stock,
provided that no person shall be a Related Person if such person would have been
a Related Person on the date of approval of this provision by BancGroup's Board
of Directors, i.e., April 20, 1994. An effect of this provision may be to
exclude Robert E. Lowder, the current Chairman and Chief Executive Officer of
BancGroup, and certain members of his family from the definition of Related
Person. A "Continuing Director" is a director who was a member of the Board of
Directors immediately prior to the time a person became a Related Person. This
provision may not be amended without the affirmative vote of the holders of at
least 75% of the outstanding shares of Voting Stock, plus the affirmative vote
of the outstanding shares of at least 67% of the outstanding Voting Stock,
excluding shares held by a Related Person. This provision may have the effect of
giving the incumbent Board of Directors a veto over a merger or other Business
Combination that could be desired by a majority of BancGroup's stockholders. As
of June 30, 1998, the Board of Directors of BancGroup owned approximately 10.06%
of the outstanding shares of BancGroup Common Stock.
 
     Board Evaluation of Mergers.  The BancGroup Certificate permits the Board
of Directors to consider certain factors such as the character and financial
stability of the other party, the projected social, legal, and economic effects
of a proposed transaction upon the employees, suppliers, regulatory agencies and
customers and communities of BancGroup, and other factors when considering
whether BancGroup should undertake a merger, sale of assets, or other similar
transaction with another party. This provision may not be amended except by the
affirmative vote of at least 80% of the outstanding shares of BancGroup Common
Stock. This provision may give greater latitude to the Board of Directors in
terms of the factors which the board may consider in recommending or rejecting a
merger or other Business Combination of BancGroup.
                                       33
<PAGE>   42
 
     Director Authority.  The BancGroup Certificate prohibits stockholders from
calling special stockholders' meetings and acting by written consent. It also
provides that only BancGroup's Board of Directors has the authority to undertake
certain actions with respect to governing BancGroup such as appointing
committees, electing officers, and establishing compensation of officers, and it
allows the Board of Directors to act by majority vote.
 
     Bylaw Provisions.  The BancGroup Bylaws provide that stockholders wishing
to propose nominees for the Board of Directors or other business to be taken up
at an annual meeting of BancGroup shareholders must comply with certain advance
written notice provisions. These bylaw provisions are intended to provide for
the more orderly conduct of stockholders' meetings but could make it more
difficult for shareholders to nominate directors or introduce business at
shareholders' meetings.
 
     Delaware Business Combination Statute.  Subject to some exceptions,
Delaware law prohibits BancGroup from entering into certain "business
combinations" (as defined) involving persons beneficially owning 15% or more of
the outstanding BancGroup Common Stock (or who is an affiliate of BancGroup and
has over the past three years beneficially owned 15% or more of such stock)
(either, for the purpose of this paragraph, an "Interested Stockholder"), unless
the Board of Directors has approved either (i) the business combination or (ii)
prior to the stock acquisition by which such person's beneficial ownership
interest reached 15% (a "Stock Acquisition"), the Stock Acquisition. The
prohibition lasts for three years from the date of the Stock Acquisition.
Notwithstanding the preceding, Delaware law allows BancGroup to enter into a
business combination with an Interested Stockholder if (i) the business
combination is approved by BancGroup's Board of Directors and authorized by an
affirmative vote of at least 66 2/3% of the outstanding voting stock of
BancGroup which is not owned by the Interested Stockholder or (ii) upon
consummation of the transaction which resulted in the shareholder becoming an
Interested Stockholder, such shareholder owned at least 85% of the outstanding
BancGroup Common Stock (excluding BancGroup Common Stock held by officers and
directors of BancGroup or by certain BancGroup stock plans). These provisions of
Delaware law apply simultaneously with the provisions of the BancGroup
Certificate relating to business combinations with a related person, described
above at "Business Combinations," but they are generally less restrictive than
the BancGroup Certificate.
 
     Control Acquisitions.  As it relates to BancGroup, the Change in Bank
Control Act of 1978 prohibits a person or group of persons from acquiring
"control" of a bank holding company unless the Federal Reserve has been given 60
days' prior written notice of such proposed acquisition and within that time
period the Federal Reserve has not issued a notice disapproving the proposed
acquisition or extending for up to another 30 days the period during which such
a disapproval may be issued. An acquisition may be made prior to the expiration
of the disapproval period if the Federal Reserve issues written notice of its
intent not to disapprove the action. Under a rebuttable presumption established
by the Federal Reserve, the acquisition of more than 10% of a class of voting
stock of a bank holding company with a class of securities registered under
Section 12 of the Exchange Act, such as BancGroup, would, under the
circumstances set forth in the presumption, constitute the acquisition of
control. The receipt of revocable proxies, provided the proxies terminate within
a reasonable time after the meeting to which they relate, is not included in
determining percentages for change in control purposes.
 
                       COMPARATIVE RIGHTS OF SHAREHOLDERS
 
     If the Merger is consummated, shareholders of InterWest (except those
perfecting dissenters' rights) will become holders of BancGroup Common Stock.
The rights of the holders of the InterWest Common Stock who become holders of
BancGroup Common Stock following the Merger will be governed by the BancGroup
Certificate and the BancGroup Bylaws, as well as the laws of Delaware, the state
in which BancGroup is incorporated.
 
     The following summary compares the rights of the holders of InterWest
Common Stock with the rights of the holders of the BancGroup Common Stock. For a
more detailed description of the rights of the holders of BancGroup Common
Stock, including certain features of the BancGroup Certificate and the Delaware
 
                                       34
<PAGE>   43
 
General Corporate Law (the "DGCL") that might limit the circumstances under
which a change in control of BancGroup could occur, see "BancGroup Capital Stock
and Debentures."
 
     The following information is qualified in its entirety by the BancGroup
Certificate and the BancGroup Bylaws, and InterWest's Articles of Incorporation
and Bylaws, the DGCL and the [NEVADA STATUTE].
 
DIRECTOR ELECTIONS
 
     InterWest.  InterWest's Directors are elected annually by a plurality of
the votes cast by the shareholders of its Common Stock. InterWest's shareholders
do not have cumulative voting rights in the election of Directors.
 
     BancGroup.  BancGroup's directors are elected to terms of three years with
approximately one-third of the Board to be elected annually. There is no
cumulative voting in the election of directors. See "BancGroup Capital Stock and
Debentures -- Changes in Control -- Classified Board."
 
REMOVAL OF DIRECTORS
 
     InterWest.  At any special meeting of InterWest's shareholders called for
the purpose, shareholders representing not less than two-thirds of the issued
and outstanding stock entitled to voting power, by vote or by written consent,
may remove any one or all of the Board of Directors, with or without cause, in
which event the vacancy or vacancies so created shall be filled by a vote of the
shareholders or, if no action is taken to fill such vacancy or vacancies by the
shareholders, by the surviving Directors as provided in Section 2 of Article III
of InterWest's Bylaws. Such election, if by the shareholders, would be by
plurality vote.
 
     BancGroup.  The BancGroup Certificate provides that a director may be
removed from office, but only for cause and by the affirmative vote of the
holders of at least 80% of the voting shares then entitled to vote at an
election of directors.
 
VOTING
 
     InterWest.  Each shareholder of InterWest is entitled to one vote for each
share of InterWest Common Stock held, and such holders are not entitled to
cumulative voting rights for the election of Directors.
 
     BancGroup.  Each stockholder of BancGroup is entitled to one vote for each
share of BancGroup Common Stock held, and such holders are not entitled to
cumulative voting rights in the election of directors.
 
PREEMPTIVE RIGHTS
 
     InterWest.  Holders of InterWest Common Stock have no preemptive rights to
acquire any additional shares of InterWest Common Stock.
 
     BancGroup.  The holders of BancGroup Common Stock have no preemptive rights
to acquire any additional shares of BancGroup Common Stock or any other shares
of BancGroup capital stock.
 
DIRECTORS' LIABILITY
 
     InterWest.  No provision is made in the Articles of Incorporation or Bylaws
of InterWest with regard to Director's Liability. The Articles of Incorporation
and Bylaws do provide for indemnification of Directors. Nevada law imposes
liability upon directors for (i) acts or omissions which involve intentional
misconduct, fraud or knowing violation of law, or (ii) payment of unlawful
distributions or dividends in violation of NRS, Section 78.300.
 
     BancGroup.  The BancGroup Certificate provides that a director of BancGroup
will have no personal liability to BancGroup or its stockholders for monetary
damages for breach of fiduciary duty as a director except (i) for any breach of
the director's duty of loyalty to the corporation or its stockholders, (ii) for
acts or omissions not in good faith or that involve intentional misconduct or a
knowing violation of law, (iii) for the payment of certain unlawful dividends
and the making of certain stock purchases or redemptions, or (iv) for
 
                                       35
<PAGE>   44
 
any transaction from which the director derived an improper personal benefit.
This provision would absolve directors of personal liability for negligence in
the performance of duties, including gross negligence. It would not permit a
director to be exculpated, however, for liability for actions involving
conflicts of interest or breaches of the traditional "duty of loyalty" to
BancGroup and its stockholders, and it would not affect the availability of
injunctive or other equitable relief as a remedy.
 
INDEMNIFICATION
 
     InterWest.  InterWest's Articles of Incorporation and Bylaws direct that
InterWest shall, to the fullest extent permitted by Nevada law, advance expenses
to and indemnify any of its directors, officers or any other person serving at
the request of InterWest against expenses, judgments, fines, settlements, and
other amounts actually and reasonably incurred in connection with any action,
suit or proceeding arising because such person is or was a director, officer or
agent of InterWest. A "Person" is defined to include a director, officer,
employee or other agent of InterWest who is or was serving at the request of
InterWest or a predecessor corporation as a director, officer, employee or agent
of another corporation, partnership, joint venture, trust or other enterprise.
The character of expenses subject to indemnification or advancement include
attorneys' fees, costs, judgments, fines, and amounts paid in settlement
actually and reasonably incurred by the Person in connection with the
litigation, but excluding judgments against any Person determined by a court of
competent jurisdiction, after all appeals, to be liable to InterWest unless such
court, considering all the circumstances determines that such Person is fairly
and reasonably entitled to indemnify for all such expenses. InterWest's Bylaws
would be interpreted to provide that InterWest shall indemnify the costs of
Persons incurred in litigation, regardless of the conduct of the person, unless
a final adjudication established that the person's acts or omissions involved
intentional misconduct, fraud or knowing violation of the law and was material
to the cause of action.
 
     BancGroup.  The BancGroup Certificate provides that directors, officers,
employees and agents of BancGroup shall be indemnified to the full extent
permitted under the DGCL. Section 145 of the DGCL contains detailed and
comprehensive provisions providing for indemnification of directors and officers
of Delaware corporations against expenses, judgments, fines and settlements in
connection with litigation. Under the DGCL, other than an action brought by or
in the right of BancGroup, such indemnification is available if it is determined
that the proposed indemnity acted in good faith and in a manner he or she
reasonably believed to be in or not opposed to the best interests of BancGroup
and, with respect to any criminal action or proceeding, had no reasonable cause
to believe his conduct was unlawful. In actions brought by or in the right of
BancGroup, such indemnification is limited to expenses (including attorneys'
fees) actually and reasonably incurred in the defense or settlement of such
action if the indemnity acted in good faith and in a manner he or she reasonably
believed to be in or not opposed to the best interests of BancGroup and except
that no indemnification shall be made in respect of any claim, issue or matter
as to which such person has been adjudged to be liable to BancGroup unless and
only to the extent that the Delaware Court of Chancery or the court in which the
action was brought determines upon application that in view of all the
circumstances of the case, such person is fairly and reasonably entitled to
indemnity for such expenses as the court deems proper.
 
     To the extent that the proposed indemnity has been successful on the merits
or otherwise in defense of any action, suit or proceeding (or any claim, issue
or matter therein), he or she must be indemnified against expenses (including
attorneys' fees) actually and reasonably incurred by him in connection
therewith.
 
     BancGroup maintains an officers' and directors' insurance policy and a
separate indemnification agreement pursuant to which officers and directors of
BancGroup would be entitled to indemnification against certain liabilities,
including reimbursement of certain expenses that extends beyond the minimum
indemnification provided by Section 145 of the DGCL.
 
SPECIAL MEETINGS OF SHAREHOLDERS; ACTION WITHOUT A MEETING
 
     InterWest.  Pursuant to the Articles of Incorporation of InterWest, a
Special Meeting of InterWest shareholders may be called by the President or the
Board of Directors. In addition thereto, the Bylaws of InterWest permit a
Special Meeting of the shareholders to be called at the request, in writing, of
the holders of a majority of the issued and outstanding common stock of
InterWest. Nevada law, and the Bylaws of
 
                                       36
<PAGE>   45
 
InterWest, provide that any action required or permitted to be taken at a
meeting of the shareholders may be taken without a meeting if a written consent
thereto is signed by the shareholders holding at least a majority vote of the
voting power.
 
     BancGroup.  Under the BancGroup Certificate, a special meeting of
BancGroup's stockholders may only be called by a majority of the BancGroup Board
of Directors or by the chairman of the Board of Directors of BancGroup. Holders
of BancGroup Common Stock may not call special meetings or act by written
consent.
 
MERGERS, SHARE EXCHANGES AND SALES OF ASSETS
 
     InterWest.  Pertinent provisions of the Nevada Revised Statutes provide
that mergers and sales of substantially all of the assets of Nevada corporations
must be approved by a majority of the outstanding stock of the corporation
entitled to vote thereon. Except as described below, the InterWest Articles of
Incorporation and Bylaws have no provisions governing voting approval for
extraordinary corporate transactions.
 
     Nevada Revised Statutes, Sections 78.411 to 78.444, inclusive, prohibit
business combinations or mergers between Nevada corporations and certain
interested stockholders for a period of three years after the interested
stockholder's date of acquiring shares unless the combination or the purchase of
the shares made by the interested stockholder is approved by the Board of
Directors. These Nevada statutes also prohibit such business combinations after
the expiration of three years after the interested stockholder's date of
acquiring shares unless the combination meets certain statutory requirements.
The Nevada statute defines interested stockholders to include persons who, along
or together with affiliates, beneficially own 10% the outstanding stock of the
corporation.
 
     Under the Nevada Control Shares statute, NRS Sections 78.378 to 78.3793, a
corporation denies voting rights to a stockholder who acquires a controlling
interest in a Nevada corporation, unless such voting rights are approved by a
majority of the voting powers of the corporation.
 
     BancGroup.  The DGCL provides that mergers and sales of substantially all
of the assets of Delaware corporations must be approved by a majority of the
outstanding stock of the corporation entitled to vote thereon. The DGCL also
provides, however, that the stockholders of the corporation surviving a merger
need not approve the transaction if: (i) the agreement of merger does not amend
in any respect the certificate of incorporation of such corporation; (ii) each
share of stock of such corporation outstanding immediately prior to the
effective date of the merger is to be an identical outstanding or treasury share
of the surviving corporation after the effective date of the merger; and (iii)
either no shares of common stock of the surviving corporation and no shares,
securities or obligations convertible into such stock are to be issued or
delivered under the plan of merger, or the authorized unissued shares or the
treasury shares of common stock of the surviving corporation to be issued or
delivered under the plan of merger plus those initially issuable upon conversion
of any other shares, securities or obligations to be issued or delivered under
such plan do not exceed 20% of the shares of common stock of such corporation
outstanding immediately prior to the effective date of the merger. See also
"BancGroup Capital Stock and Debentures -- Changes in Control" for a description
of the statutory provisions and the provisions of the BancGroup Certificate
relating to changes of control of BancGroup. See "Antitakeover Statutes" for a
description of additional restrictions on business combination transactions.
 
AMENDMENT OF CERTIFICATE OF INCORPORATION AND BYLAWS
 
     InterWest.  Pursuant to the Articles of Incorporation, and under Nevada
law, the Articles of Incorporation of InterWest may be amended by the
affirmative vote of the holders of a majority of the issued and outstanding
Common Stock. The Bylaws of InterWest authorized an amendment thereto by the
shareholders or Board of Directors provided notice of such amendment is given as
provided by the Articles of Incorporation and Nevada law.
 
     BancGroup.  Under the DGCL, a Delaware corporation's certificate of
incorporation may be amended by the affirmative vote of the holders of a
majority of the outstanding shares entitled to vote thereon, and a majority of
the outstanding stock of each class entitled to vote as a class, unless the
certificate requires the vote
 
                                       37
<PAGE>   46
 
of a larger portion of the stock. The BancGroup Certificate requires
"super-majority" Stockholder approval to amend or repeal any provision of, or
adopt any provision inconsistent with, certain provisions in the BancGroup
Certificate governing (i) the election or removal of directors, (ii) business
combinations between BancGroup and a Related Person, and (iii) board of
directors evaluation of business combination procedures. See "BancGroup Capital
Stock and Debentures -- Changes in Control."
 
     As is permitted by the DGCL, the Certificate gives the Board of Directors
the power to adopt, amend or repeal the BancGroup Bylaws. The stockholders
entitled to vote have concurrent power to adopt, amend or repeal the BancGroup
Bylaws.
 
RIGHTS OF DISSENTING STOCKHOLDERS
 
     InterWest.  Sections 92A.300 to 92A.500 of the Nevada Revised Statutes
provide statutory appraisal rights to shareholders dissenting from certain
corporate reorganizations such as mergers or sales of all or substantially all
of the corporation's assets which would include the Merger. A Dissenting
Shareholder will be entitled to receive for each share of InterWest Common Stock
as to which dissenters' rights are perfected the fair value of his or her
shares. See "The Merger -- Rights of Dissenting Shareholders."
 
     BancGroup.  Under the DGCL, a stockholder has the right, in certain
circumstances, to dissent from certain corporate transactions and receive the
fair value of his or her shares in cash in lieu of the consideration he or she
otherwise would have received in the transaction. For this purpose, "fair value"
may be determined by all generally accepted techniques of valuation used in the
financial community, excluding any element of value arising from the
accomplishment or expectation of the transaction, but including elements of
future value that are known or susceptible of proof. Such fair value is
determined by the Delaware Court of Chancery, if a petition for appraisal is
timely filed. Appraisal rights are not available, however, to stockholders of a
corporation (i) if the shares are listed on a national securities exchange (as
is BancGroup Common Stock) or quoted on the Nasdaq NMS, or held of record by
more than 2,000 stockholders (as is BancGroup Common Stock), and (ii)
stockholders are permitted by the terms of the merger or consolidation to accept
in exchange for their shares (a) shares of stock of the surviving or resulting
corporation, (b) shares of stock of another corporation listed on a national
securities exchange or held of record by more than 2,000 stockholders, (c) cash
in lieu of fractional shares of such stock, or (d) any combination thereof.
Stockholders are not permitted appraisal rights in a merger if such corporation
is the surviving corporation and no vote of its stockholders is required.
 
PREFERRED STOCK
 
     InterWest.  The Articles of Incorporation of InterWest do not authorize the
issuance of any preferred stock.
 
     BancGroup.  The BancGroup Certificate authorizes the issuance of 1,000,000
shares of Preference Stock from time to time by resolution of the Board of
Directors of BancGroup. Currently, no shares of Preference Stock are issued and
outstanding. See "BancGroup Capital Stock and Debentures -- Preference Stock."
 
EFFECT OF THE MERGER ON INTERWEST SHAREHOLDERS
 
     As of                , InterWest had 22 shareholders of record and
3,088,145 outstanding shares of common stock. As of June 30, 1998 and giving
effect to the Stock Split, there were 98,232,266 shares of BancGroup Common
Stock outstanding held by 8,910 stockholders of record.
 
     Assuming that no dissenters' rights of appraisal are exercised in the
Merger, that no InterWest Options are exercised prior to the Effective Date,
that no InterWest Options are exchanged in the Cashless Exchange, and the Market
Value of BancGroup Common Stock is between $15.00 and $20.00 per share on the
Effective Date, an aggregate number of approximately 1,455,752 shares of
BancGroup Common Stock will be issued to the shareholders of InterWest pursuant
to the Merger. These shares would represent approximately 1.46% of
 
                                       38
<PAGE>   47
 
the total shares of BancGroup Common Stock outstanding after the Merger, not
counting any shares of BancGroup Common Stock to be issued in other pending
acquisitions.
 
     The issuance of the BancGroup Common Stock pursuant to the Merger will
reduce the percentage interest of the BancGroup Common Stock currently held by
each principal stockholder and each director and officer of BancGroup. Based
upon the foregoing assumptions, as a group, the directors and officers of
BancGroup who own approximately 10.06% of BancGroup's outstanding shares would
own approximately 9.91% after the Merger. See "Business of BancGroup -- Voting
Securities and Principal Stockholders."
 
     BancGroup has entered into agreements pursuant to which additional shares
of BancGroup Common Stock will be issued. See "Business of BancGroup -- Recently
Completed and Other Proposed Business Combinations."
 
                                       39
<PAGE>   48
 
                 THE COLONIAL BANCGROUP, INC. AND SUBSIDIARIES
             CONDENSED PRO FORMA STATEMENT OF CONDITION (UNAUDITED)
                                 (IN THOUSANDS)
 
     The following summary includes (i) the condensed consolidated statement of
condition of BancGroup and subsidiaries as of June 30, 1998, (ii) the condensed
consolidated statement of condition of CNB Holding Company ("CNB") as of June
30, 1998, (iii) adjustments to give effect to the completed pooling-of-interests
method business combination with CNB (iv) the condensed statement of condition
of InterWest Bancorp ("InterWest") as of June 30, 1998, (v) adjustments to give
effect to the proposed pooling-of-interests method business combination with
InterWest, (vi) combined presentation of the condensed statements of condition
of the other probable business combinations with FirstBank, First Macon Bank &
Trust and Prime Bank of Central Florida ("Other Probable Business Combinations")
as of June 30, 1998, (vii) adjustments to give effect to the proposed
pooling-of-interests method business combinations with the Other Probable
Business Combinations, (viii) the pro forma combined condensed statement of
condition of BancGroup and subsidiaires as if such combinations had occurred on
June 30, 1998.
 
     The pro forma statement of condition excludes the effect of an immaterial
pending business combination with Texas Bank & Trust located in Dallas, Texas.
 
     These pro forma statements should be read in conjunction with the
accompanying notes and the separate consolidated statements of condition of
BancGroup and subsidiaries, incorporated by reference herein. The pro forma
information provided below may not be indicative of future results.
 
                                       40
<PAGE>   49
<TABLE>
<CAPTION>
                                                                       JUNE 30, 1998
                                    -----------------------------------------------------------------------------------
                                    CONSOLIDATED    COMPLETED
                                      COLONIAL      BUSINESS     ADJUSTMENTS/                ADJUSTMENTS/
                                     BANCGROUP     COMBINATION   (DEDUCTIONS)    INTERWEST   (DEDUCTIONS)     SUBTOTAL
                                    ------------   -----------   ------------    ---------   ------------    ----------
<S>                                 <C>            <C>           <C>             <C>         <C>             <C>
ASSETS
Cash and due from banks...........   $  344,388      $ 3,491                     $  6,088      $   (645)(2)  $  353,322
Interest-bearing deposits in
 banks............................       20,630        7,024                       22,896                        50,550
Securities available for sale.....    1,117,946       15,216                          297                     1,133,459
Investment securities.............      235,297        1,993                                                    237,290
Mortgage loans held for sale......      532,140                                                                 532,140
Loans, net of unearned income.....    6,027,489       58,594                       95,535                     6,181,618
Less: Allowance for possible loan
 losses...........................      (72,782)        (430)                        (950)                      (74,162)
                                     ----------      -------       -------       --------      --------      ----------
Loans, net........................    5,954,707       58,164            --         94,585            --       6,107,456
Premises and equipment, net.......      156,618        3,274                        4,735                       164,627
Excess of cost over tangible and
 identified intangible assets
 acquired, net....................       78,688                                                                  78,688
Mortgage servicing rights.........      174,693                                                                 174,693
Other real estate owned...........       10,624           62                                                     10,686
Accrued interest and other
 assets...........................      146,802          562                        1,853                       149,217
                                     ----------      -------       -------       --------      --------      ----------
      Total Assets................   $8,772,533      $89,786       $             $130,454      $   (645)     $8,992,128
                                     ==========      =======       =======       ========      ========      ==========
LIABILITIES AND SHAREHOLDERS'
 EQUITY
Deposits..........................   $6,193,818      $81,107                     $115,728                    $6,390,653
FHLB short-term borrowings........      640,000                                                                 640,000
Other short-term borrowings.......      453,482                                     5,216                       458,698
Subordinated debt.................       12,716                                                                  12,716
Trust preferred securities........       70,000                                                                  70,000
FHLB long-term debt...............      448,422                                                                 448,422
Other long-term debt..............      200,075                                        26                       200,101
Other liabilities.................      152,249          209       $   649            791      $  1,018(2)      154,916
                                     ----------      -------       -------       --------      --------      ----------
      Total liabilities...........    8,170,762       81,316           649        121,761         1,018       8,375,506
Minority interest.................                                                    936          (936)(2)          --
Preferred Stock
Common Stock(1)...................      245,581          153          (153)(1)      1,547        (1,547)(2)     253,624
                                                                     4,419(1)                     3,624(2)
Additional paid in capital(1).....      115,958          762          (762)(1)         --        (2,077)(2)     109,948
                                                                    (4,224)(1)                      291(2)
Retained earnings.................      238,996        8,236          (649)         6,210        (1,018)(2)     251,775
Treasury Stock....................                      (720)          720
Unearned compensation.............       (3,282)          --                                                     (3,282)
Unrealized gain (loss) on
 securities available for sale,
 net of taxes.....................        4,518           39            --              0                         4,557
                                     ----------      -------       -------       --------      --------      ----------
      Total shareholders'
       equity.....................      601,771        8,470          (649)         7,757          (727)        616,622
                                     ----------      -------       -------       --------      --------      ----------
      Total liabilities and
       equity.....................   $8,772,533      $89,786       $    --       $130,454      $   (645)     $8,992,128
                                     ==========      =======       =======       ========      ========      ==========
Capital Ratios:
 Capital Ratio....................         7.77%
 Tangible Leverage Ratio..........         7.15
 Tier One Capital Ratio*..........         9.40
 Total Capital Ratio*.............        10.76
 
<CAPTION>
                                                  JUNE 30, 1998
                                    ------------------------------------------
                                    OTHER PROBABLE                  PRO FORMA
                                       BUSINESS      ADJUSTMENTS/    COMBINED
                                     COMBINATIONS    (DEDUCTIONS)     TOTAL
                                    --------------   ------------   ----------
<S>                                 <C>              <C>            <C>
ASSETS
Cash and due from banks...........     $ 30,949                     $  384,271
Interest-bearing deposits in
 banks............................       60,716                        111,266
Securities available for sale.....       18,468                      1,151,927
Investment securities.............       76,572                        313,862
Mortgage loans held for sale......                                     532,140
Loans, net of unearned income.....      232,033                      6,413,651
Less: Allowance for possible loan
 losses...........................       (2,876)                       (77,038)
                                       --------        --------     ----------
Loans, net........................      229,157              --      6,336,613
Premises and equipment, net.......        9,035                        173,662
Excess of cost over tangible and
 identified intangible assets
 acquired, net....................           39                         78,727
Mortgage servicing rights.........                                     174,693
Other real estate owned...........           49                         10,735
Accrued interest and other
 assets...........................        3,654                        152,871
                                       --------        --------     ----------
      Total Assets................     $428,639        $     --     $9,420,767
                                       ========        ========     ==========
LIABILITIES AND SHAREHOLDERS'
 EQUITY
Deposits..........................     $374,448                     $6,765,101
FHLB short-term borrowings........        5,000                        645,000
Other short-term borrowings.......       13,378                        472,076
Subordinated debt.................                                      12,716
Trust preferred securities........                                      70,000
FHLB long-term debt...............                                     448,422
Other long-term debt..............           --                        200,101
Other liabilities.................        3,888        $    380(3)     160,170
                                                            624(4)
                                                            362(5)
                                       --------        --------     ----------
      Total liabilities...........      396,714           1,366      8,773,586
Minority interest.................                                          --
Preferred Stock
Common Stock(1)...................        2,638          (1,700)(3)    272,286
                                                           (538)(4)
                                                           (400)(5)
                                                          6,555(3)
                                                          9,520(4)
                                                          2,587(5)
Additional paid in capital(1).....       20,317          (4,940)(3)    114,241
                                                        (11,606)(4)
                                                         (3,771)(5)
                                                             85(3)
                                                          2,624(4)
                                                          1,584(5)
Retained earnings.................        8,692            (380)(3)    259,101
                                                           (624)(4)
                                                           (362)(5)
Treasury Stock....................                                          --
Unearned compensation.............                                      (3,282)
Unrealized gain (loss) on
 securities available for sale,
 net of taxes.....................          278                          4,835
                                       --------        --------     ----------
      Total shareholders'
       equity.....................       31,925          (1,366)       647,181
                                       --------        --------     ----------
      Total liabilities and
       equity.....................     $428,639        $     --     $9,420,767
                                       ========        ========     ==========
Capital Ratios:
 Capital Ratio....................                                        7.77%
 Tangible Leverage Ratio..........                                        7.17
 Tier One Capital Ratio*..........                                        9.45
 Total Capital Ratio*.............                                       10.79
</TABLE>
 
- ---------------
 
  * Based on risk-weighted assets.
(1) Restated to reflect the impact of a two-for-one stock split in the form of a
    100% stock dividend paid August 14, 1998.
 
                                       41
<PAGE>   50
 
                         COMPLETED BUSINESS COMBINATION
 
CNB HOLDING COMPANY
  (pooling of interests)
 
(1) (A) To record the issuance of 1,767,601 shares of BancGroup Common Stock in
        exchange for all of the outstanding shares of CNB Holding Company
 
<TABLE>
<S>                                                           <C>        <C>
     CNB Holding Company outstanding shares.................   147,935
     Conversion ratio.......................................   11.9485
                                                              --------
     BancGroup shares to be issued..........................              1,767,601
     Par value of 1,767,601 shares issued at $2.50 per
      share.................................................             $    4,419
     Shares issued at par value.............................  $  4,419
     Total capital stock of CNB Holding Company.............       195
                                                              --------
     Excess recorded as a decrease to contributed capital...                 (4,224)
                                                                         ----------
                                                                                195
     To eliminate CNB Holding Company
       Common stock, at par value...........................             $     (153)
       Contributed capital..................................                   (762)
       Treasury stock.......................................                    720
                                                                         ----------
                                                                               (195)
                                                                         ----------
          Net change in equity..............................             $       --
                                                                         ==========
     (B) To record possible nonrecurring charges associated
         with severence payable to terminated employees,
         contract buy-outs, noncompete agreements, fixed
         assets write-offs and other nonrecurring one-time
         restructuring charges, net of taxes................             $     (649)
                                                                         ==========
</TABLE>
 
                         PENDING BUSINESS COMBINATIONS
 
INTERWEST BANCORP
  (pooling of interests)
 
(2) (A) To record the issuance of 1,449,590 shares of BancGroup Common Stock in
        exchange for all of the outstanding shares of InterWest
 
<TABLE>
<S>                                                           <C>          <C>
     InterWest outstanding shares...........................   3,075,075
     Conversion ratio.......................................      0.4714
                                                              ----------
     BancGroup shares to be issued..........................                1,449,590
     Par value of 1,449,590 shares issued at $2.50 per
      share.................................................               $    3,624
     Shares issued at par value.............................  $    3,624
     Total capital stock InterWest..........................       1,547
                                                              ----------
     Excess recorded as a decrease to contributed capital...                   (2,077)
                                                                           ----------
                                                                                1,547
     To eliminate InterWest
       Common stock, at par value...........................               $   (1,547)
       Contributed capital..................................                       --
                                                                               (1,547)
                                                                           ----------
          Net change in equity..............................               $       --
                                                                           ==========
     (B) To record purchase of minority interest by
         InterWest Bank prior to the merger of InterWest
         with BancGroup
          Minority interest.................................               $     (936)
          Additional paid in capital........................                      291
                                                                           ----------
          Total purchase price to be paid in cash...........               $     (645)
                                                                           ==========
     (C) To record possible nonrecurring charges associated
         with retention and compensation agreements, stock
         options, fixed assets write-offs and other
         nonrecurring one-time restructuring charges, net of
         taxes..............................................               $   (1,018)
                                                                           ==========
</TABLE>
 
                                       42
<PAGE>   51
 
FIRSTBANK
  (pooling of interests)
 
(3) (A) To record the issuance of 2,621,944 shares of BancGroup Common Stock in
        exchange for all of the outstanding shares of FirstBank
 
<TABLE>
<S>                                                           <C>          <C>
     FirstBank outstanding shares...........................     340,000
     Conversion ratio.......................................      7.7116
                                                              ----------
     BancGroup shares to be issued..........................                2,621,944
     Par value of 2,621,944 shares issued at $2.50 per
      share.................................................               $    6,555
     Shares issued at par value.............................  $    6,555
     Total capital stock of FirstBank.......................       6,640
                                                              ----------
     Excess recorded as an increase to contributed
      capital...............................................                       85
                                                                           ----------
                                                                                6,640
     To eliminate FirstBank
       Common stock, at par value...........................               $   (1,700)
       Contributed capital..................................                   (4,940)
                                                                           ----------
                                                                               (6,640)
                                                                           ----------
          Net change in equity..............................               $       --
                                                                           ==========
     (B) To record possible nonrecurring charges associated
         with professional fees, employee retention bonuses
         and fixed asset write-offs, net of taxes...........               $     (380)
                                                                           ==========
</TABLE>
 
FIRST MACON BANK & TRUST
  (pooling of interests)
 
(4) (A) To record the issuance of 3,808,056 shares of BancGroup Common Stock in
        exchange for all of the outstanding shares of First Macon Bank & Trust
 
<TABLE>
<S>                                                           <C>          <C>
     First Macon Bank & Trust outstanding shares............   1,076,604
     Conversion ratio.......................................      3.5371
                                                              ----------
     BancGroup shares to be issued..........................                3,808,056
     Par value of 3,808,056 shares issued at $2.50 per
      share.................................................               $    9,520
     Shares issued at par value.............................  $    9,520
     Total capital stock of First Macon Bank & Trust........      12,144
                                                              ----------
     Excess recorded as an increase to contributed
      capital...............................................                    2,624
                                                                           ----------
                                                                               12,144
     To eliminate First Macon Bank & Trust
       Common stock, at par value...........................               $     (538)
       Contributed capital..................................                  (11,606)
                                                                           ----------
                                                                              (12,144)
                                                                           ----------
          Net change in equity..............................               $       --
                                                                           ==========
     (B) To record possible nonrecurring charges associated
         with severence payable to terminated employees,
         professional fees, contract buy-outs, fixed assets
         write-offs and other nonrecurring one-time
         restructuring charges, net of taxes................               $     (624)
                                                                           ==========
</TABLE>
 
                                       43
<PAGE>   52
 
PRIME BANK OF CENTRAL FLORIDA
  (pooling of interests)
 
(5) (A) To record the issuance of 1,034,800 shares of BancGroup Common Stock in
        exchange for all of the outstanding shares of Prime Bank of Central
        Florida
 
<TABLE>
<S>                                                           <C>        <C>
     Prime Bank of Central Florida outstanding shares.......   400,000
     Conversion ratio.......................................    2.5870
                                                              --------
     BancGroup shares to be issued..........................              1,034,800
     Par value of 1,034,800 shares issued at $2.50 per
      share.................................................             $    2,587
     Shares issued at par value.............................  $  2,587
     Total capital stock of Prime Bank of Central Florida...     4,171
                                                              --------
     Excess recorded as an increase to contributed
      capital...............................................                  1,584
                                                                         ----------
                                                                              4,171
     To eliminate Prime Bank of Central Florida
       Common stock, at par value...........................             $     (400)
       Contributed capital..................................                 (3,771)
                                                                         ----------
                                                                             (4,171)
                                                                         ----------
          Net change in equity..............................  $                  --
                                                                         ==========
     (B) To record possible nonrecurring charges associated
         with severence payable to terminated employees,
         professional fees, contract buy-outs, fixed assets
         write-offs and other nonrecurring one-time
         restructuring charges, net of taxes................             $     (362)
                                                                         ==========
</TABLE>
 
                                       44
<PAGE>   53
 
                 THE COLONIAL BANCGROUP, INC. AND SUBSIDIARIES
 
              CONDENSED PRO FORMA STATEMENTS OF INCOME (UNAUDITED)
                                 (IN THOUSANDS)
 
    The following summary includes (i) the condensed consolidated statements of
income of BancGroup and subsidiaries on a historical basis for the six months
ended June 30, 1998 and 1997 and for the years ended December 31, 1997, 1996 and
1995,(ii) CNB Holding Company for the six months ended June 30, 1998 and 1997
and for the years ended December 31, 1997, 1996, 1995, and the condensed
consolidated statements of income Commercial Bank of Nevada for the years ended
December 31, 1997, 1996 and 1995 and (iii) adjustments to give effect to the
completed pooling-of-interests method business combinations with Commercial Bank
of Nevada and CNB Holding Company, (iv) the condensed consolidated statements of
income of InterWest for the six months ended June 30, 1998 and 1997 and for the
years ended December 31, 1997, 1996 and 1995, (v) adjustments to give effect to
the proposed pooling-of-interests method business combination with InterWest,
(vi) the combined presentation of the condensed statements of income of
FirstBank, First Macon Bank & Trust and Prime Bank of Central Florida ("Other
Probable Business Combinations") for the six months ended June 30, 1998 and 1997
and for the years ended December 31, 1997, 1996 and 1995, (vii) adjustments to
give effect to the proposed pooling-of-interests method business combinations
with the Other Probable Business Combinations, (viii) the pro forma statements
of income of BancGroup and subsidiaries as if such business combinations had
occurred on January 1, 1995.
 
    The pro forma statements of income exclude the effect of an immaterial
pending business combination with Texas Bank & Trust located in Dallas, Texas.
 
    These pro forma statements should be read in conjunction with the
accompanying notes and the separate consolidated statements of income of
BancGroup and subsidiaries, incorporated by reference herein. The pro forma
information provided may not necessarily be indicative of future results.
<TABLE>
<CAPTION>
                                                              SIX MONTHS ENDED JUNE, 1998
                         -----------------------------------------------------------------------------------------------------
                         CONSOLIDATED    COMPLETED                                                              OTHER PROBABLE
                           COLONIAL      BUSINESS     ADJUSTMENTS/                ADJUSTMENTS/                     BUSINESS
                          BANCGROUP     COMBINATION   (DEDUCTIONS)   INTERWEST    (DEDUCTIONS)     SUBTOTAL      COMBINATIONS
                         ------------   -----------   ------------   ----------   ------------   ------------   --------------
<S>                      <C>            <C>           <C>            <C>          <C>            <C>            <C>
Interest income........  $    306,662   $    3,415     $       --    $    8,500   $        --    $    318,577     $   15,682
Interest expense.......       153,441        1,275             --         2,199            --         156,915          6,918
                         ------------   ----------     ----------    ----------   -----------    ------------     ----------
Net interest income....       153,221        2,140             --         6,301            --         161,662          8,764
Provision for possible
 loan losses...........         7,543           12                          126                         7,681            236
                         ------------   ----------     ----------    ----------   -----------    ------------     ----------
Net interest income
 after provision for
 loan losses...........       145,678        2,128             --         6,175            --         153,981          8,528
                         ------------   ----------     ----------    ----------   -----------    ------------     ----------
Noninterest income.....        57,420          284             --           233            --          57,937          1,148
Noninterest expense....       134,850        1,362             --         5,544            --         141,756          5,032
                                                               --
                         ------------   ----------     ----------    ----------   -----------    ------------     ----------
Income before income
 taxes.................        68,248        1,050             --           864            --          70,162          4,644
Applicable income
 taxes.................        25,837          101             --           319                        26,257            902
                         ------------   ----------     ----------    ----------   -----------    ------------     ----------
Net income.............  $     42,411   $      949     $       --    $      545   $        --    $     43,905     $    3,742
                         ============   ==========     ==========    ==========   ===========    ============     ==========
Average basic shares
 outstanding(1)........    97,682,000      145,142       (145,142)    3,027,431    (3,027,431)    100,843,360      1,813,854
                                                        1,734,229                   1,427,131
Average diluted shares
 outstanding(1)........   100,292,000      148,270       (148,270)    3,027,431    (3,027,431)    103,520,292      1,813,854
                                                        1,771,604                   1,456,688
Earnings per share:
   Basic(1)............  $       0.43                                                            $       0.44
   Diluted(1)..........  $       0.43                                                            $       0.43
 
<CAPTION>
                         SIX MONTHS ENDED JUNE, 1998
                         ----------------------------
                                          PRO FORMA
                         ADJUSTMENTS/      COMBINED
                         (DEDUCTIONS)       TOTAL
                         ------------    ------------
<S>                      <C>             <C>
Interest income........  $        --     $    334,259
Interest expense.......           --          163,833
                         -----------     ------------
Net interest income....           --          170,426
Provision for possible
 loan losses...........                         7,917
                         -----------     ------------
Net interest income
 after provision for
 loan losses...........           --          162,509
                         -----------     ------------
Noninterest income.....                        59,085
Noninterest expense....           --          146,788
                                  --
                         -----------     ------------
Income before income
 taxes.................           --           74,806
Applicable income
 taxes.................          732(1)        27,891
                         -----------     ------------
Net income.............  $      (732)    $     46,915
                         ===========     ============
Average basic shares
 outstanding(1)........   (1,813,854)     108,298,422
                           7,455,062
Average diluted shares
 outstanding(1)........   (1,813,854)     110,975,354
                           7,455,062
Earnings per share:
   Basic(1)............                  $       0.43
   Diluted(1)..........                  $       0.42
</TABLE>
 
- ---------------
 
(1) Restated to reflect the impact of a two-for-one stock split in the form of a
    100% stock dividend paid August 14, 1998.
 
                                       45
<PAGE>   54
<TABLE>
<CAPTION>
                                                  SIX MONTHS ENDED JUNE 30, 1997
                       ------------------------------------------------------------------------------------
                       CONSOLIDATED
                         COLONIAL      COMPLETED
                        BANCGROUP      BUSINESS     ADJUSTMENTS/                ADJUSTMENTS/
                       (RESTATED)*    COMBINATION   (DEDUCTIONS)   INTERWEST    (DEDUCTIONS)     SUBTOTAL
                       ------------   -----------   ------------   ----------   ------------   ------------
<S>                    <C>            <C>           <C>            <C>          <C>            <C>
Interest income......  $   263,403     $  3,238      $       --    $    6,376   $        --    $    273,017
Interest expense.....      129,788        1,217              --         1,346            --         132,351
                       -----------     --------      ----------    ----------   -----------    ------------
Net interest
 income..............      133,615        2,021              --         5,030            --         140,666
Provision for
 possible loan
 losses..............        7,288           56              --           150         7,494              --
                       -----------     --------      ----------    ----------   -----------    ------------
Net interest income
 after provision for
 loan losses.........      126,327        1,965              --         4,880            --         133,172
                       -----------     --------      ----------    ----------   -----------    ------------
Noninterest income...       42,524          254              --           232            --          43,010
Noninterest
 expense.............      106,163        1,124              --         4,733            --         112,020
                       -----------     --------      ----------    ----------   -----------    ------------
Income before income
 taxes...............       62,688        1,095              --           379            --          64,162
Applicable income
 taxes...............       23,008          409              --           145            --          23,562
                       -----------     --------      ----------    ----------   -----------    ------------
Net income...........  $    39,680     $    686      $       --    $      234   $        --    $     40,600
                       ===========     ========      ==========    ==========   ===========    ============
Average basic shares
 outstanding(1)......   93,788,000      147,451        (147,451)    2,997,080    (2,997,080)     96,962,642
                                                      1,761,818                   1,412,824
Average diluted
 shares
 outstanding(1)......   97,064,000      151,324        (151,324)    2,997,080    (2,997,080)    100,312,137
                                                      1,808,095                   1,440,043
Earnings per share:
   Basic(1)..........  $      0.42                                                             $       0.42
   Diluted(1)........  $      0.41                                                             $       0.41
 
<CAPTION>
                              SIX MONTHS ENDED JUNE 30, 1997
                       --------------------------------------------
 
                       OTHER PROBABLE                   PRO FORMA
                          BUSINESS      ADJUSTMENTS/     COMBINED
                        COMBINATIONS    (DEDUCTIONS)      TOTAL
                       --------------   ------------   ------------
<S>                    <C>              <C>            <C>
Interest income......    $   12,355     $        --    $    285,372
Interest expense.....         5,191              --         137,542
                         ----------     -----------    ------------
Net interest
 income..............         7,164              --         147,830
Provision for
 possible loan
 losses..............           279              --           7,773
                         ----------     -----------    ------------
Net interest income
 after provision for
 loan losses.........         6,885              --         140,057
                         ----------     -----------    ------------
Noninterest income...         1,018                          44,028
Noninterest
 expense.............         4,392              --         116,412
                         ----------     -----------    ------------
Income before income
 taxes...............         3,511              --          67,673
Applicable income
 taxes...............           981              --          24,543
                         ----------     -----------    ------------
Net income...........    $    2,530     $        --    $     43,130
                         ==========     ===========    ============
Average basic shares
 outstanding(1)......     1,814,211      (1,814,211)    104,471,215
                                          7,508,573
Average diluted
 shares
 outstanding(1)......     1,814,211      (1,814,211)    107,820,711
                                          7,508,573
Earnings per share:
   Basic(1)..........                                  $       0.41
   Diluted(1)........                                  $       0.40
</TABLE>
 
- ---------------
 
* Restated to give retroactive effect to the June 1998 pooling-of-interests
  business combination with Commercial Bank of Nevada.
<TABLE>
<CAPTION>
                                                        YEAR ENDED DECEMBER 31, 1997
                            -------------------------------------------------------------------------------------
                            CONSOLIDATED    COMPLETED
                              COLONIAL       BUSINESS     ADJUSTMENTS/                ADJUSTMENTS/
                             BANCGROUP     COMBINATIONS   (DEDUCTIONS)   INTERWEST    (DEDUCTIONS)     SUBTOTAL
                            ------------   ------------   ------------   ----------   ------------   ------------
<S>                         <C>            <C>            <C>            <C>          <C>            <C>
Interest income...........  $   540,699      $ 15,036      $       --    $   14,134   $        --    $    569,869
Interest expense..........      267,084         5,889              --         2,920            --         275,893
                            -----------      --------      ----------    ----------   -----------    ------------
Net interest income.......      273,615         9,147              --        11,214            --         293,976
Provision for possible
 loan losses..............       14,860           945              --           270            --          16,075
                            -----------      --------      ----------    ----------   -----------    ------------
Net interest income after
 provision for loan
 losses...................      258,755         8,202              --        10,944            --         277,901
                            -----------      --------      ----------    ----------   -----------    ------------
Noninterest income........       92,550         1,063              --           287            --          93,900
Noninterest expense.......      220,232         5,442              --        10,161            --         235,835
                                                                   --
                            -----------      --------      ----------    ----------   -----------    ------------
Income before income
 taxes....................      131,073         3,823              --         1,070            --         135,966
Applicable income taxes...       48,557         1,388              --           417            --          50,362
                            -----------      --------      ----------    ----------   -----------    ------------
Net income................  $    82,516      $  2,435      $       --    $      653   $        --    $     85,604
                            ===========      ========      ==========    ==========   ===========    ============
Average basic shares
 outstanding(1)...........   93,072,000       989,270        (989,270)    3,006,139    (3,006,139)     97,931,188
                                                            3,442,094                   1,417,094
Average diluted shares
 outstanding(1)...........   96,316,000       992,693        (992,693)    3,006,139    (3,006,139)    101,239,678
                                                            3,482,993                   1,440,685
Earnings per share:
   Basic(1)...............  $      0.89                                                              $       0.87
   Diluted(1).............  $      0.86                                                              $       0.85
 
<CAPTION>
                                    YEAR ENDED DECEMBER 31, 1997
                            ---------------------------------------------
                            OTHER PROBABLE                    PRO FORMA
                               BUSINESS      ADJUSTMENTS/      COMBINED
                             COMBINATIONS    (DEDUCTIONS)       TOTAL
                            --------------   ------------    ------------
<S>                         <C>              <C>             <C>
Interest income...........    $   27,038     $        --     $    596,907
Interest expense..........        11,491              --          287,384
                              ----------     -----------     ------------
Net interest income.......        15,547              --          309,523
Provision for possible
 loan losses..............           317              --           16,392
                              ----------     -----------     ------------
Net interest income after
 provision for loan
 losses...................        15,230              --          293,131
                              ----------     -----------     ------------
Noninterest income........         2,201              --           96,101
Noninterest expense.......         9,272              --          245,107
                                                      --
                              ----------     -----------     ------------
Income before income
 taxes....................         8,159              --          144,125
Applicable income taxes...         1,934             913(2)        53,209
                              ----------     -----------     ------------
Net income................    $    6,225     $      (913)    $     90,916
                              ==========     ===========     ============
Average basic shares
 outstanding(1)...........     1,813,785      (1,813,785)     105,428,017
                                               7,496,829
Average diluted shares
 outstanding(1)...........     1,813,785      (1,813,785)     108,736,507
                                               7,496,829
Earnings per share:
   Basic(1)...............                                   $       0.86
   Diluted(1).............                                   $       0.84
</TABLE>
 
- ---------------
 
(1) Restated to reflect the impact of a two-for-one stock split in the form of a
    100% stock dividend paid August 14, 1998.
 
                                       46
<PAGE>   55
<TABLE>
<CAPTION>
                                                    YEAR ENDED DECEMBER 31, 1996
                        ------------------------------------------------------------------------------------
                        CONSOLIDATED    COMPLETED
                          COLONIAL       BUSINESS     ADJUSTMENTS/                ADJUSTMENTS/
                         BANCGROUP     COMBINATIONS   (DEDUCTIONS)   INTERWEST    (DEDUCTIONS)    SUBTOTAL
                        ------------   ------------   ------------   ----------   ------------   -----------
<S>                     <C>            <C>            <C>            <C>          <C>            <C>
Interest income.......  $   444,082      $10,214       $       --    $   11,648    $       --    $   465,944
Interest expense......      219,494        3,562               --         2,550            --        225,606
                        -----------      -------       ----------    ----------    ----------    -----------
Net interest income...      224,588        6,652               --         9,098            --        240,338
Provision for possible
 loan losses..........       13,564          402                             60                       14,026
                        -----------      -------       ----------    ----------    ----------    -----------
Net interest income
 after provision for
 loan losses..........      211,024        6,250               --         9,038            --        226,312
                        -----------      -------       ----------    ----------    ----------    -----------
Noninterest income....       74,860          724               --           437            --         76,021
Noninterest expense...      198,971        3,904               --         7,947            --        210,822
                        -----------      -------       ----------    ----------    ----------    -----------
Income before income
 taxes................       86,913        3,070               --         1,528            --         91,511
Applicable income
 taxes................       30,631          940               --           556                       32,127
                        -----------      -------       ----------    ----------    ----------    -----------
Net income............  $    56,282      $ 2,130       $       --    $      972    $       --    $    59,384
                        ===========      =======       ==========    ==========    ==========    ===========
Average basic shares
 outstanding(1).......   85,678,000      805,524         (805,524)    2,962,146    (2,962,146)    90,148,549
                                                        3,074,194                   1,396,356
Average diluted shares
 outstanding(1).......   89,552,000      809,510         (809,510)    2,962,146    (2,962,146)    94,145,015
                                                        3,189,897                   1,403,119
Earnings per share:
   Basic(1)...........  $      0.66                                                              $      0.66
   Diluted(1).........  $      0.63                                                              $      0.64
 
<CAPTION>
                                YEAR ENDED DECEMBER 31, 1996
                        --------------------------------------------
                        OTHER PROBABLE                   PRO FORMA
                           BUSINESS      ADJUSTMENTS/     COMBINED
                         COMBINATIONS    (DEDUCTIONS)      TOTAL
                        --------------   ------------   ------------
<S>                     <C>              <C>            <C>
Interest income.......    $   21,717      $       --    $    487,661
Interest expense......         8,887              --         234,493
                          ----------      ----------    ------------
Net interest income...        12,830              --         253,168
Provision for possible
 loan losses..........           474                          14,500
                          ----------      ----------    ------------
Net interest income
 after provision for
 loan losses..........        12,356              --         238,668
                          ----------      ----------    ------------
Noninterest income....         1,991              --          78,012
Noninterest expense...         8,676              --         219,498
                          ----------      ----------    ------------
Income before income
 taxes................         5,671              --          97,182
Applicable income
 taxes................         1,802              --          33,929
                          ----------      ----------    ------------
Net income............    $    3,869      $       --    $     63,253
                          ==========      ==========    ============
Average basic shares
 outstanding(1).......     1,808,926      (1,808,926)     97,642,332
                                           7,493,783
Average diluted shares
 outstanding(1).......     1,808,926      (1,808,926)    101,638,798
                                           7,493,783
Earnings per share:
   Basic(1)...........                                  $       0.65
   Diluted(1).........                                  $       0.63
</TABLE>
<TABLE>
<CAPTION>
                                                     YEAR ENDED DECEMBER 31, 1995
                         ------------------------------------------------------------------------------------
                         CONSOLIDATED    COMPLETED
                           COLONIAL       BUSINESS     ADJUSTMENTS/                ADJUSTMENTS/
                          BANCGROUP     COMBINATIONS   (DEDUCTIONS)   INTERWEST    (DEDUCTIONS)    SUBTOTAL
                         ------------   ------------   ------------   ----------   ------------   -----------
<S>                      <C>            <C>            <C>            <C>          <C>            <C>
Interest income........  $   371,985      $ 7,178       $       --    $   11,850    $       --    $   391,013
Interest expense.......      182,441        2,474               --         2,306            --        187,221
                         -----------      -------       ----------    ----------    ----------    -----------
Net interest income....      189,544        4,704               --         9,544            --        203,792
Provision for possible
 loan losses...........       10,180          207               --            70            --         10,457
                         -----------      -------       ----------    ----------    ----------    -----------
Net interest income
 after provision for
 loan losses...........      179,364        4,497               --         9,474            --        193,335
                         -----------      -------       ----------    ----------    ----------    -----------
Noninterest income.....       63,479          557               --           166            --         64,202
Noninterest expense....      164,739        3,276               --         7,927            --        175,942
                         -----------      -------       ----------    ----------    ----------    -----------
Income before income
 taxes.................       78,104        1,778               --         1,713            --         81,595
Applicable income
 taxes.................       27,462          744               --           733            --         28,939
                         -----------      -------       ----------    ----------    ----------    -----------
Net income.............  $    50,642      $ 1,034       $       --    $      980    $       --    $    52,656
                         ===========      =======       ==========    ==========    ==========    ===========
Average basic shares
 outstanding(1)........   79,574,000      655,606         (655,606)    2,923,880    (2,923,880)    83,731,112
                                                         2,778,795                   1,378,317
Average diluted shares
 outstanding(1)........   87,298,000      657,358         (657,358)    2,923,880    (2,923,880)    91,476,046
                                                         2,799,729                   1,378,317
Earnings per share:
   Basic(1)............  $      0.64                                                              $      0.63
   Diluted(1)..........  $      0.59                                                              $      0.59
 
<CAPTION>
                                YEAR ENDED DECEMBER 31, 1995
                         -------------------------------------------
                         OTHER PROBABLE                   PRO FORMA
                            BUSINESS      ADJUSTMENTS/    COMBINED
                          COMBINATIONS    (DEDUCTIONS)      TOTAL
                         --------------   ------------   -----------
<S>                      <C>              <C>            <C>
Interest income........    $   18,376                    $   409,389
Interest expense.......         7,478              --        194,699
                           ----------      ----------    -----------
Net interest income....        10,898              --        214,690
Provision for possible
 loan losses...........           547              --         11,004
                           ----------      ----------    -----------
Net interest income
 after provision for
 loan losses...........        10,351              --        203,686
                           ----------      ----------    -----------
Noninterest income.....         1,619              --         65,821
Noninterest expense....         7,260              --        183,202
                           ----------      ----------    -----------
Income before income
 taxes.................         4,710              --         86,305
Applicable income
 taxes.................         1,476              --         30,415
                           ----------      ----------    -----------
Net income.............    $    3,234      $       --    $    55,890
                           ==========      ==========    ===========
Average basic shares
 outstanding(1)........     1,777,392      (1,777,392)    91,132,346
                                            7,401,234
Average diluted shares
 outstanding(1)........     1,777,392      (1,777,392)    98,877,280
                                            7,401,234
Earnings per share:
   Basic(1)............                                  $      0.61
   Diluted(1)..........                                  $      0.58
</TABLE>
 
- ---------------
 
(1) Restated to reflect the impact of a two-for-one stock split in the form of a
    100% stock dividend paid August 14, 1998.
 
                                       47
<PAGE>   56
 
                             PRO FORMA ADJUSTMENTS
 
ADJUSTMENTS APPLICABLE TO THE POOLING-OF-INTERESTS BUSINESS COMBINATION WITH
FIRSTBANK
 
     1) To record a provision for income taxes for FirstBank as if FirstBank had
merged with BancGroup on January 1, 1995. Subsequent to its S-Corporation
election as of January 1, 1997, FirstBank does not include a provision for
income taxes in their 1998 and 1997 financial statements.
 
                              NONRECURRING CHARGES
                                 (IN THOUSANDS)
 
     The following table reflects the primary components of the nonrecurring
charges and related tax effect which will result directly from the business
combinations and which will be included in BancGroup's results. These charges
are not reflected in the condensed pro forma statements of income but are
reflected in the condensed pro forma statement of condition. (Please refer to
BancGroup's Current Report on Form 8-K dated March 16, 1998 and incorporated by
reference herein.)
 
COMPLETED BUSINESS COMBINATION
 
(1) Possible charges applicable to the pooling-of-interests method business
combination with CNB Holding Company:
 
<TABLE>
   <S>                                                           <C>
   Increase in expense:
     Write-off of fixed assets.................................  $  (199)
     Potential severence to terminated employees...............      (52)
     Non-compete agreements....................................     (183)
     Contract buy-outs.........................................     (570)
     Write-off of other assets.................................      (34)
                                                                 -------
   Net decrease in income before taxes.........................   (1,038)
   Tax effect of the pro forma adjustment......................      389
                                                                 -------
        Net decrease in income.................................  $  (649)
                                                                 =======
</TABLE>
 
PENDING BUSINESS COMBINATIONS
 
(2) Possible charges applicable to the pooling-of-interests method business
combination with InterWest:
 
<TABLE>
   <S>                                                           <C>
   Increase in expense:
     Write-off of fixed assets.................................  $  (480)
     Retention bonus agreements................................     (250)
     Stock option compensation expense adjustment..............     (727)
     Other miscellaneous adjustments...........................      (40)
                                                                 -------
   Net decrease in income before taxes.........................   (1,497)
   Tax effect of the pro forma adjustment......................      479
                                                                 -------
        Net decrease in income.................................  $(1,018)
                                                                 =======
</TABLE>
 
                                       48
<PAGE>   57
 
(3) Possible charges applicable to the pooling-of-interests method business
combination with FirstBank:
 
<TABLE>
   <S>                                                           <C>
   Increase in expense:
     Professional fees.........................................  $(100)
     Retention bonus agreements................................   (500)
     Write-off of fixed assets.................................     (8)
                                                                 -----
   Net decrease in income before tax...........................   (608)
   Tax effect of the pro forma adjustment......................    228
                                                                 -----
        Net decrease in income.................................  ($380)
                                                                 =====
</TABLE>
 
(4) Possible charges applicable to the pooling-of-interests method business
combination with First Macon:
 
<TABLE>
   <S>                                                           <C>
   Increase in expense:
     Contract buy-outs.........................................  $(153)
     Potential severence payable to terminated employees.......   (162)
     Professional fees.........................................   (305)
     Write-off of other assets.................................    (51)
     Write-off of fixed assets.................................   (328)
                                                                 -----
   Net decrease in income before tax...........................   (999)
   Tax effect of the pro forma adjustments.....................    375
                                                                 -----
        Net decrease in income.................................  ($624)
                                                                 =====
</TABLE>
 
(5) Possible adjustments applicable to the pooling-of-interests method business
combination with Prime Bank:
 
<TABLE>
   <S>                                                           <C>
   Increase in expense:
     Contract buy-outs.........................................  $  (92)
     Potential severence payable to terminated employees.......     (35)
     Professional fees.........................................    (180)
     Other noncompete, salary continuation agreements..........    (124)
     Deferred tax and interest adjustments.....................      50
     Write-off of other assets.................................     (88)
     Write-off of fixed assets.................................    (128)
   Net decrease in income before tax...........................    (597)
   Tax effect of the pro forma adjustments.....................     235
                                                                 ------
        Net decrease in income.................................  ($ 362)
                                                                 ======
</TABLE>
 
                                       49
<PAGE>   58
 
                 THE COLONIAL BANCGROUP, INC. AND SUBSIDIARIES
                  SELECTED FINANCIAL AND OPERATING INFORMATION
 
     The following tables present certain financial information for BancGroup on
a historical basis and pro forma basis. The first table presents historical and
pro forma information for the six months ended June 30, 1998 and 1997. The
second table presents historical and pro forma income statements for the years
ended December 31, 1997, 1996 and 1995 as well as historical for the years ended
December 31, 1994 and 1993. The final table presents proforma and historical
statements of condition as June 30, 1998 as well as historical for the years
ended December 31, 1997, 1996, 1995, 1994 and 1993.
 
     The pro forma information includes consolidated BancGroup and subsidiaries
and InterWest Bancorp, Commercial Bank of Nevada, CNB Holding Company,
FirstBank, First Macon Bank and Trust and Prime Bank of Central Florida. The pro
forma balance sheet data gives effect to the combinations as if they had
occurred on June 30, 1998 and the pro forma operating data gives effect to the
combinations as if they occurred at the beginning of the earliest period
presented.
 
     The following selected financial information should be read in conjunction
with the discussion set forth in "Management's Discussion and Analysis of
Financial Condition and Results of Operations," and all financial statements
included elsewhere in this Prospectus and incorporated by reference. The pro
forma information provided below may not be indicative of future results.
 
<TABLE>
<CAPTION>
                                                                  SIX MONTHS ENDED JUNE 30,
                                                       -----------------------------------------------
                                                       BANCGROUP   BANCGROUP    BANCGROUP   BANCGROUP
                                                       PRO FORMA   HISTORICAL   PRO FORMA   HISTORICAL
                                                         1998         1998        1997        1997*
                                                       ---------   ----------   ---------   ----------
<S>                                                    <C>         <C>          <C>         <C>
STATEMENT OF INCOME
Interest income......................................  $334,259     $306,662    $285,372     $263,403
Interest expense.....................................   163,833      153,441     137,542      129,788
                                                       --------     --------    --------     --------
Net interest income..................................   170,426      153,221     147,830      133,615
Provision for possible loan losses...................     7,917        7,543       7,773        7,288
                                                       --------     --------    --------     --------
Net interest income after provision for loan
  losses.............................................   162,509      145,678     140,057      126,327
Noninterest income...................................    59,085       57,420      44,028       42,524
Noninterest expense..................................   136,194      124,256     113,778      103,529
Acquisition and restructuring costs and Year 2000
  expenses...........................................    10,594       10,594       2,634        2,634
                                                       --------     --------    --------     --------
Income before income taxes...........................    74,806       68,248      67,673       62,688
Applicable income taxes..............................    27,891       25,837      24,543       23,008
                                                       --------     --------    --------     --------
Net income...........................................  $ 46,915     $ 42,411    $ 43,130     $ 39,680
                                                       ========     ========    ========     ========
Income excluding acquisition and restructuring costs
  and Year 2000 expenses.............................  $ 53,942     $ 49,438    $ 45,237     $ 41,787
                                                       ========     ========    ========     ========
EARNINGS PER SHARE
Income excluding acquisition and restructuring costs
  and Year 2000 expenses:
  Basic(1)...........................................  $   0.50     $   0.51    $   0.43     $   0.45
  Diluted(1).........................................  $   0.49     $   0.49    $   0.42     $   0.43
Net income:
  Basic(1)...........................................  $   0.43     $   0.43    $   0.41     $   0.42
  Diluted(1).........................................  $   0.42     $   0.43    $   0.40     $   0.41
Average shares outstanding
  Basic(1)...........................................   108,298       97,682     104,471       93,788
  Diluted(1).........................................   110,975      100,292     107,821       97,064
Cash dividends:
  Common(1)..........................................  $   0.17     $   0.17    $   0.15     $   0.15
</TABLE>
 
                                       50
<PAGE>   59
 
<TABLE>
<CAPTION>
                                   YEAR ENDED DECEMBER 31,                           YEAR ENDED DECEMBER 31,
                              ---------------------------------   --------------------------------------------------------------
                              BANCGROUP   BANCGROUP   BANCGROUP   BANCGROUP    BANCGROUP    BANCGROUP    BANCGROUP    BANCGROUP
                              PRO FORMA   PRO FORMA   PRO FORMA   HISTORICAL   HISTORICAL   HISTORICAL   HISTORICAL   HISTORICAL
                                1997        1996        1995         1997         1996         1995         1994         1993
                              ---------   ---------   ---------   ----------   ----------   ----------   ----------   ----------
<S>                           <C>         <C>         <C>         <C>          <C>          <C>          <C>          <C>
STATEMENT OF INCOME
Interest income.............  $596,907    $487,661    $409,389     $540,699     $444,082     $371,985     $278,223     $224,209
Interest expense............   287,384     234,493     194,699      267,084      219,494      182,441      113,715       88,568
                              --------    --------    --------     --------     --------     --------     --------     --------
Net interest income.........   309,523     253,168     214,690      273,615      224,588      189,544      164,508      135,641
Provision for possible loan
  losses....................    16,392      14,500      11,004       14,860       13,564       10,180        8,943       14,437
Net interest income after
  provision for loan
  losses....................   293,131     238,668     203,686      258,755      211,024      179,364      155,565      121,204
Noninterest income..........    96,101      78,012      65,821       92,550       74,860       63,479       56,567       53,655
Noninterest expense.........   238,644     202,826     181,464      213,769      182,588      163,001      154,083      135,471
SAIF special assessment.....        --       4,754          --           --        4,465           --           --           --
Acquisition and
  restructuring costs.......     6,463      11,918       1,738        6,463       11,918        1,738        1,348          960
                              --------    --------    --------     --------     --------     --------     --------     --------
Income before income
  taxes.....................   144,125      97,182      86,305      131,073       86,913       78,104       56,701       38,428
Applicable income taxes.....    53,209      33,929      30,415       48,557       30,631       27,462       18,610       12,216
                              --------    --------    --------     --------     --------     --------     --------     --------
Income before extraordinary
  items.....................    90,916      63,253      55,890       82,516       56,282       50,642       38,091       26,212
Extraordinary items.........        --          --          --           --           --           --           --         (396)
Cumulative effect of a
  change in accounting......        --          --          --           --           --           --           --        3,890
                              --------    --------    --------     --------     --------     --------     --------     --------
Net income..................  $ 90,916    $ 63,253    $ 55,890     $ 82,516     $ 56,282     $ 50,642     $ 38,091     $ 29,706
                              ========    ========    ========     ========     ========     ========     ========     ========
Income excluding SAIF
  special assessment and
  acquisition and
  restructuring costs.......  $ 96,086    $ 75,877    $ 57,280     $ 87,686     $ 68,719     $ 52,032     $ 39,169     $ 26,980
                              ========    ========    ========     ========     ========     ========     ========     ========
EARNINGS PER SHARE
Income excluding SAIF
  special assessment and
  acquisition and
  restructuring costs:
  Basic(1)..................  $   0.91    $   0.78    $   0.63     $   0.94     $   0.80     $   0.65     $   0.52     $   0.40
  Diluted(1)................      0.88        0.75        0.58         0.91         0.77         0.61         0.49         0.38
Income before extraordinary
  items:
  Basic(1)..................      0.86        0.65        0.61         0.89         0.66     $   0.64     $   0.51     $   0.39
  Diluted(1)................      0.84        0.63        0.58         0.86         0.63         0.59         0.48         0.37
Net income:
  Basic(1)..................      0.86        0.65        0.61         0.89         0.66         0.64         0.51         0.44
  Diluted(1)................      0.84        0.63        0.58         0.86         0.63         0.59         0.48         0.42
Average shares outstanding
  Basic(1)..................   105,428      97,642      91,132       93,072       85,678       79,574       74,722       67,024
  Diluted(1)................   108,737     101,639      98,877       96,316       89,552       87,298       81,986       74,930
Cash dividends:
    Common**(1).............  $   0.30    $   0.27    $ 0.1688     $   0.30     $   0.27     $ 0.1688     $     --     $     --
    Class A**(1)............        --          --      0.0563           --           --       0.0563        0.200        0.178
    Class B**(1)............        --          --      0.0313           --           --       0.0313        0.100        0.078
</TABLE>
 
- ---------------
 
* Restated to give retroactive effect to the June 1998 pooling-of-interests
  business combination with Commercial Bank of Nevada.
** The pro forma cash dividends are equal to the historical BancGroup cash
   dividends.
(1) Restated to reflect the impact of a two-for-one stock split in the form of a
    100% stock dividend paid August 14, 1998.
 
                                       51
<PAGE>   60
 
<TABLE>
<CAPTION>
                                    JUNE 30,                                    DECEMBER 31,
                             -----------------------   --------------------------------------------------------------
                             BANCGROUP    BANCGROUP    BANCGROUP    BANCGROUP    BANCGROUP    BANCGROUP    BANCGROUP
                             PRO FORMA    HISTORICAL   HISTORICAL   HISTORICAL   HISTORICAL   HISTORICAL   HISTORICAL
                                1998         1998         1997         1996         1995         1994         1993
                             ----------   ----------   ----------   ----------   ----------   ----------   ----------
<S>                          <C>          <C>          <C>          <C>          <C>          <C>          <C>
STATEMENT OF CONDITION DATA
At period end:
Total assets............... $9,421,412   $8,772,533   $7,442,661   $6,165,691   $5,370,361   $4,214,492    $4,022,477
  Loans, net of unearned
    income.................  6,413,651    6,027,489    5,585,901    4,558,780    3,924,785    2,959,565     2,468,564
  Mortgage loans held for
    sale...................    532,140      532,140      225,331      157,966      116,688       61,556       368,515
  Deposits.................  6,765,101    6,193,818    5,771,702    4,728,896    4,223,539    3,378,252     3,252,771
  Long-term debt...........    731,239      731,213      315,252       39,092       48,688       89,040        57,397
  Shareholders' equity.....    647,826      601,771      543,262      443,391      388,770      298,812       279,300
Average daily balances
  Total assets.............  8,638,491    8,023,494    6,911,648    5,742,474    4,756,418    4,028,482     3,308,106
  Interest-earning
    assets.................  7,821,868    7,247,199    6,325,872    5,253,921    4,347,437    3,645,499     2,945,172
  Loans, net of unearned
    income.................  6,202,619    5,826,532    5,184,653    4,240,554    3,371,192    2,669,363     1,988,563
  Mortgage loans held for
    sale...................    327,638      327,638      149,309      135,135       98,785      135,046       248,502
  Deposits.................  6,560,651    6,030,070    5,442,818    4,463,015    3,787,613    3,280,208     2,666,025
  Shareholders' equity.....    620,714      580,931      504,739      423,289      339,734      292,892       220,802
Book value per share(3)....  $    5.94    $    6.13    $    5.76    $    5.12    $    4.69    $    3.94    $     3.83
Tangible book value per
  share(3).................       5.23         5.33         5.02         4.77         4.33         3.68          3.61
SELECTED RATIOS
Income excluding SAIF
  special assessment,
  acquisition and
  restructuring costs and
  Year 2000 expenses to:
  Average assets...........       1.26%        1.24%        1.27%        1.20%        1.09%        0.97%         0.82%
  Average stockholders'
    equity.................      17.50        17.16        17.37        16.23        15.32        13.37         12.22
Income before extraordinary
  items and the cumulative
  effect of a change in
  accounting for income
  taxes to:
  Average assets...........       1.18         1.13         1.19         0.98         1.06         0.95          0.79
  Average stockholders'
    equity.................      16.37        15.64        16.35        13.30        14.91        13.01         11.87
Net income to:
  Average assets...........       1.18         1.13         1.19         0.98         1.06         0.95          0.90
  Average stockholders'
    equity.................      16.37        15.64        16.35        13.30        14.91        13.01         13.45
Efficiency ratio(1)(2).....      61.46        58.60        57.94        60.46        63.89        69.00         71.23
Dividend payout............      39.53        39.53        33.90        41.22        35.43        39.22         39.89
Average equity to average
  assets...................       7.19         7.24         7.30         7.37         7.14         7.27          6.67
Allowance for possible loan
  losses to total loans
  (Net of unearned
  income)..................       1.20%        1.21%        1.21%        1.27%        1.29%        1.54%         1.59%
</TABLE>
 
- ---------------
 
(1) Legislation approving a one-time special assessment to recapitalize the
    Savings Association Insurance Fund ("SAIF") resulted in $4,754,000 in
    expense before income taxes and $3,090,000 net of applicable income taxes in
    1996.
(2) Acquisition expenses reflect one-time costs and related restructuring
    expense of business combinations.
(3) Restated to reflect the impact of a two-for-one stock split in the form of a
    100% stock dividend paid August 14, 1998.
 
                                       52
<PAGE>   61
 
                               INTERWEST BANCORP
 
                            SELECTED FINANCIAL DATA
 
<TABLE>
<CAPTION>
                                    AT AND FOR THE SIX MONTHS
                                              ENDED                                 AT AND FOR THE YEAR ENDED
                                  -----------------------------   --------------------------------------------------------------
                                  JUNE 30, 1998   JUNE 30, 1997      1997         1996         1995         1994         1993
                                  -------------   -------------   ----------   ----------   ----------   ----------   ----------
                                                          (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                               <C>             <C>             <C>          <C>          <C>          <C>          <C>
At Period End:
  Cash and cash equivalents.....   $   28,984      $    7,297     $   14,722   $   11,313   $   11,223   $    9,520   $    8,941
  Investment securities.........          297             207            399          153          775        1,552        4,011
  Loans, net....................       94,585          65,034         77,867       57,202       50,387       38,628       35,449
  Other assets..................        6,588           6,222          6,171        6,118        2,546        3,025        2,324
                                   ----------      ----------     ----------   ----------   ----------   ----------   ----------
        Total assets............   $  130,454      $   78,760     $   99,159   $   74,786   $   64,931   $   52,725   $   50,725
                                   ==========      ==========     ==========   ==========   ==========   ==========   ==========
  Deposits......................   $  115,728      $   67,997     $   89,314   $   62,548   $   43,778   $   40,137   $   34,011
  Other liabilities.............        6,033           3,225          1,819        4,826       14,930        7,453       11,619
  Minority interest.............          936             818            871          779          695          588          511
  Stockholder's Equity..........        7,757           6,720          7,155        6,633        5,528        4,547        4,584
                                   ----------      ----------     ----------   ----------   ----------   ----------   ----------
        Total liabilities,
          minority interest and
          stockholders'
          equity................   $  130,454      $   78,760     $   99,159   $   74,786   $   64,931   $   52,725   $   50,725
                                   ==========      ==========     ==========   ==========   ==========   ==========   ==========
For the Period:
  Total interest income.........   $    4,555      $    3,200     $    7,024   $    5,633   $    5,170   $    4,001   $    3,813
  Total interest expense........        2,199           1,346          2,920        2,550        2,306        1,432        1,740
                                   ----------      ----------     ----------   ----------   ----------   ----------   ----------
        Net interest income.....        2,356           1,854          4,104        3,083        2,864        2,569        2,073
  Provision for loan losses.....          126             150            270           60           70           60          (77)
                                   ----------      ----------     ----------   ----------   ----------   ----------   ----------
        Net interest income
          after provision for
          loan losses...........        2,230           1,704          3,834        3,023        2,794        2,509        2,150
  Noninterest income............        4,178           3,408          7,397        6,451        6,846        4,755        9,077
  Noninterest expense...........        5,474           4,684         10,054        7,821        7,773        7,053        8,345
                                   ----------      ----------     ----------   ----------   ----------   ----------   ----------
    Income (loss) before income
      taxes.....................          934             428          1,177        1,653        1,867          211        2,882
  Income taxes..................          319             145            416          556          733           69          998
                                   ----------      ----------     ----------   ----------   ----------   ----------   ----------
        Net income (loss) before
          minority interest.....          615             283            761        1,097        1,134          142        1,884
  Minority interest in income of
    subsidiary..................           70              49            108          125          154          130          103
                                   ----------      ----------     ----------   ----------   ----------   ----------   ----------
        Net income (loss).......          545             234            653          972          980           12        1,781
                                   ==========      ==========     ==========   ==========   ==========   ==========   ==========
  Net income (loss) per share...   $     0.18      $     0.08     $     0.22   $     0.33   $     0.34   $     0.00   $     0.61
                                   ==========      ==========     ==========   ==========   ==========   ==========   ==========
  Weighted average number of
    shares outstanding..........    3,027,431       2,997,080      3,005,791    2,961,549    2,923,880    2,923,880    2,923,880
                                   ==========      ==========     ==========   ==========   ==========   ==========   ==========
Actual shares outstanding at end
  of period                         3,075,075       3,013,721      3,020,021    2,992,256    2,923,880    2,923,880    2,923,880
                                   ==========      ==========     ==========   ==========   ==========   ==========   ==========
Book value per share............   $     2.52      $     2.23     $     2.37   $     2.22   $     1.89   $     1.56   $     1.57
                                   ==========      ==========     ==========   ==========   ==========   ==========   ==========
Ratios and Other Data:
  Return on average assets......         0.49%           0.32%          0.82%        1.44%        1.67%        0.02%        3.37%
  Return on average equity......         7.22            3.54           9.51        15.43        19.56         0.26        44.57
  Average equity to average
    earning assets..............         7.52           10.31           9.91        10.75         9.33        10.76         8.51
  Net yield on average earning
    assets......................         9.14           10.06          10.14         9.61         9.63         9.17         8.12
  Average earning assets to
    average interest-bearing
    liabilities.................         1.16            1.12           1.15         1.14         1.14         1.15         1.09
  Noninterest expense to average
    assets......................         4.90            6.33          12.69        11.63        13.27        14.65        15.81
  Nonperforming assets as a
    percent of total assets.....         1.03            2.30           0.96         0.95         1.27         0.92         1.42
  Allowance for loan losses to
    total loans.................         0.99            1.07           1.04         1.01         1.05         1.18         1.13
</TABLE>
 
                                       53
<PAGE>   62
 
                               INTERWEST BANCORP
 
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
GENERAL
 
     InterWest's results of operations are primarily dependent upon the results
of operations of the Bank, its subsidiary bank, and secondarily upon the results
of operations of the Mortgage Company, its subsidiary mortgage company.
 
     The Bank conducts commercial banking business consisting of attracting
deposits from the general public and applying those funds to the origination of
commercial, consumer and real estate loans (including commercial loans
collateralized by real estate). The Bank's profitability depends primarily on
net interest income, which is the excess of interest income generated from
interest-bearing assets (i.e., loans, investments and federal funds sold) over
interest expense incurred on interest-bearing liabilities (i.e., customer
deposits and borrowed funds). Net interest income is affected by the relative
amounts of interest-earning assets and interest-bearing liabilities, and the
interest rate earned and paid on these balances. Net interest income is
dependent upon the Bank's interest-rate spread which is the excess of average
yield earned on its interest-earning assets over the average rate paid on its
interest-bearing liabilities. When interest-earning assets approximate or exceed
interest-bearing liabilities, any positive interest rate spread will generate
net interest income. The interest-rate spread is impacted by interest rates and
the amounts of deposits and loans. Additionally, the Bank's profitability is
affected by such factors as the level of non-interest income and expenses and
the provision for credit losses. Non-interest income consists primarily of
service fees on deposit accounts. Non-interest expense consists primarily of
compensation, employee benefits, occupancy and equipment expenses, professional
fees, data processing costs, deposit insurance premiums paid to the FDIC and
other operating expenses.
 
     The Mortgage Company conducts mortgage banking business consisting of
originating, marketing and servicing residential real estate loans. The Mortgage
Company originates and sells loans in the secondary market without recourse and
retains servicing on a nominal portion. The loans are sold to approved investors
including, but not limited to, FNMA and FHLMC. The Mortgage company's funding
needs are met through a revolving line of credit at U.S. Bank N.A. The Mortgage
Company also sells pre-approved loans to the Bank under the terms of a Mortgage
Loan Purchase Agreement. Loans that are not pre-committed to the secondary
market are hedged as a means to control interest rate risk exposure and to offer
borrowers more competitive rates. The Mortgage Company's profitability depends
on its ability to originate a sufficient volume of residential real estate loans
on an on-going basis. The Mortgage Company's income is fee based and includes
origination fees, marketing gains, servicing premiums and servicing fees.
Expenses consist primarily of compensation, employee benefits, occupancy and
equipment expenses and other operating expenses.
 
     Management's discussion of earnings and analysis of earnings and related
financial data are presented herein to assist investors in understanding the
financial condition of InterWest at, and the results of operations of InterWest
for the six months ended, June 30, 1998 and 1997, and the years ended December
31, 1997, 1996 and 1995. This discussion should be read in conjunction with the
consolidated financial statements and related footnotes of InterWest presented
elsewhere herein.
 
LIQUIDITY
 
     Liquidity management involves the ability to meet the cash flow
requirements of customers who may be depositors wanting to withdraw their funds
or borrowers needing assurance that sufficient funds will be available to meet
their credit needs. In the ordinary course of business, the Bank's cash flows
are generated from interest and fee income as well as from loan repayments. In
addition to cash and due from banks, the Bank considers federal funds sold as
the primary source and a line of credit with the Federal Home Loan Bank of San
Francisco as a secondary source of asset liquidity. Many factors affect the
ability to accomplish these liquidity objectives successfully, including the
economic environment, and the asset/liability mix within the balance sheet, as
well as the Bank's reputation in the community. At December 31, 1997 and June
30, 1998,
                                       54
<PAGE>   63
 
the Bank had unused lines of credit and commitments to fund loans totaling $23.6
million, and $32.5 million, respectively. In addition, scheduled maturities of
certificates of deposit during the year following December 31, 1997 and the 12
months following June 30, 1998 totaled $31.7 million and $46.6 million,
respectively. Management believes that the Bank has adequate resources to fund
all of its commitments, that substantially all of its existing commitments will
be funded within 12 months and, if so desired, that the Bank can adjust the
rates and terms on certificates of deposit and other deposit accounts to retain
deposits in a changing interest rate environment.
 
     The Mortgage Company's cash flows are generated from fee income and the
sale of loans. Once the Mortgage Company's loans are funded, they are
subsequently financed by drawing down on the warehouse line of credit with U.S.
Bank N.A. or by selling the loans on the same day they are funded to the Bank.
 
CAPITAL RESOURCES
 
     InterWest's total stockholders' equity was $7.155 and $6.633 million as of
December 31, 1997 and 1996, respectively, which represents an increase of $522
thousand. This increase was the result of 1997's net income of $653 thousand,
$62 thousand received from stock options exercised, offset by payment of
dividends in the amount of $193 thousand.
 
     The Federal banking regulatory authorities have adopted certain "prompt
corrective action" rules with respect to depository institutions. The rules
establish five capital tiers: "well capitalized", "adequately capitalized",
"undercapitalized", "significantly undercapitalized" and "critically
undercapitalized". The various federal bank regulatory agencies have adopted
regulations to implement the capital rules by, among other things, defining the
relevant capital measures for the five capital categories. An institution is
deemed to be "well capitalized" if it has a total risk-based capital ratio of
10% or greater, a Tier I risked based capital ratio of 6% or greater, a Tier I
leverage ratio of 5% or greater and is not subject to a regulatory order,
agreement, or directive to meet and maintain a specific capital level. At
December 31, 1997 and June 30, 1998, the Bank met the capital ratios of an
"adequately capitalized" financial institution with a total risk-based capital
ratio of 9.10% and 8.34%, respectively, a Tier I risk-based capital ratio of
8.03% and 7.31%, respectively, and a Tier I leverage ratio of 7.07% and 6.38%,
respectively. Depository institutions which fall below the "adequately
capitalized" category generally are prohibited from making any capital
distribution, are subject to growth limitations, and are required to submit a
capital restoration plan. There are a number of requirements and restrictions
that may be imposed on institutions treated as "significantly undercapitalized'
and, if the institution is "critically undercapitalized", the banking regulatory
agencies have the right to appoint a receiver or conservator.
 
                                       55
<PAGE>   64
 
     In accordance with risk capital guidelines issued by the FDIC, the Bank is
required to maintain a minimum standard of total capital to risk-weighted assets
of 8%. Additionally, the FDIC requires banks to maintain a minimum
leverage-capital ratio Tier 1 capital (as defined) to total assets. The
leverage-capital ratio ranges from 3% to 5% based on the bank's rating under the
regulatory rating system. The required leverage-capital ratio for the Bank at
December 31, 1997 was 4.0%. The following table summarizes the regulatory
capital levels and ratios for the Bank:
 
<TABLE>
<CAPTION>
                                                              ACTUAL RATIOS
                                                              -------------
                                                                  BANK        REGULATORY
                                                               SUBSIDIARY     REQUIREMENT
                                                              -------------   -----------
<S>                                                           <C>             <C>
At June 30, 1998:
  Total capital to risk-weighted assets.....................       8.34%         8.00%
  Tier 1 capital to risk-weighted assets....................       7.31          4.00
  Tier 1 capital to total assets -- leverage ratio..........       6.38          4.00
At December 31, 1997:
  Total capital to risk-weighted assets.....................       9.10%         8.00%
  Tier 1 capital to risk-weighted assets....................       8.03          4.00
  Tier 1 capital to total assets -- leverage ratio..........       7.07          4.00
At December 31, 1996:
  Total capital to risk-weighted assets.....................      11.09%         8.00%
  Tier 1 capital to risk-weighted assets....................      10.03          4.00
  Tier 1 capital to total assets -- leverage ratio..........       9.34          4.00
At December 31, 1995:
  Total capital to risk-weighted assets.....................      14.11%         8.00%
  Tier 1 capital to risk-weighted assets....................      12.87          4.00
  Tier 1 capital to total assets -- leverage ratio..........      10.52          4.00
</TABLE>
 
                                       56
<PAGE>   65
 
RESULTS OF OPERATIONS
 
  General
 
     InterWest's net income before taxes was $545,060 or $.18 per share for the
six months ended June 30, 1998, as compared to $233,562 or $.08 per share for
the six months ended June 30, 1997, an increase of $311,498. InterWest's net
income for the year ended December 31, 1997 was $652,881 as compared to net
income for the year ended December 31, 1996 of $971,761 a decrease of $318,880
or 32.8%.
 
     The following table presents information regarding (i) the total dollar
amount of InterWest's interest income from interest-earning assets and the
resulting average yield; (ii) the total dollar amount of interest expense on
interest-bearing liabilities and the resulting average cost, (iii) net interest
income; (iv) net interest spread, and (v) net interest margin, for the periods
indicated:
 
<TABLE>
<CAPTION>
                                                                SIX MONTHS ENDED JUNE 30,
                                             ---------------------------------------------------------------
                                                          1998                             1997
                                             ------------------------------    -----------------------------
                                             AVERAGE                 YIELD/    AVERAGE                YIELD/
                                             BALANCE     INTEREST     RATE     BALANCE    INTEREST     RATE
                                             --------    --------    ------    -------    --------    ------
                                                                 (DOLLARS IN THOUSANDS)
<S>                                          <C>         <C>         <C>       <C>        <C>         <C>
ASSETS (4):
Interest-earning assets
    Loans(1).............................    $ 87,812     $4,209      9.67%    $57,901     $3,032     10.56%
    Investments..........................         362         12      6.68         173          5      5.83
    Federal funds sold...................      12,289        334      5.48       6,046        163      5.44
                                             --------     ------      ----     -------     ------     -----
         Total earning assets............     100,463      4,555      9.14      64,120      3,200     10.06
                                                          ------      ----                 ------     -----
Non-earning assets.......................      11,294                            9,864
                                             --------                          -------
         Total Assets....................    $111,757                          $73,984
                                             ========                          =======
LIABILITIES, MINORITY INTEREST AND
  STOCKHOLDER'S EQUITY (4):
    Savings and NOW accounts.............    $ 35,647     $  769      4.35%    $30,745     $  663      4.35%
    Money market deposits................       4,650         87      3.77       3,530         61      3.48
    Certificates of deposit..............      41,495      1,198      5.82      19,849        536      5.45
    Borrowings...........................       4,760        145      6.14       3,003         86      5.78
                                             --------     ------      ----     -------     ------     -----
         Total interest-bearing
           liabilities...................      86,552      2,199      5.12      57,127      1,346      4.75
                                                          ------      ----                 ------     -----
Non-interest bearing liabilities.........      16,739                            9,443
Minority Interest........................         915                              802
Stockholder's equity.....................       7,551                            6,612
                                             --------                          -------
         Total liabilities, minority
           interest and stockholder's
           equity........................    $111,757                          $73,984
                                             ========                          =======
Spread and Interest Differential:
Net interest income......................                 $2,356                           $1,854
                                                          ======                           ======
Interest-rate spread(2)..................                             4.02%                            5.31%
                                                                      ====                            =====
Net interest margin(3)...................                             4.73%                            5.83%
                                                                      ====                            =====
Ratio of average earning assets to
  average interest-bearing liabilities...        1.16                             1.12
                                             ========                          =======
</TABLE>
 
- ---------------
 
(1) Includes loans on non-accrual status.
(2) Interest-rate spread represents the excess of the average yield on
    interest-earning assets over the average cost of interest-bearing
    liabilities.
(3) Net interest margin represents net interest income (annualized) divided by
    average interest-earning assets.
(4) Average balances are based upon average daily balances for the Bank,
    month-end balances for the Mortgage Company (as daily balances are
    unavailable), and quarter-end balances for InterWest (as daily or monthly
    balances are unavailable).
 
                                       57
<PAGE>   66
 
<TABLE>
<CAPTION>
                                                 YEAR ENDED DECEMBER 31,        YEAR ENDED DECEMBER 31,
                                                          1997                           1996
                                               ---------------------------    ---------------------------
                                               AVERAGE              YIELD/    AVERAGE              YIELD/
                                               BALANCE   INTEREST    RATE     BALANCE   INTEREST    RATE
                                               -------   --------   ------    -------   --------   ------
                                                                 (DOLLARS IN THOUSANDS)
<S>                                            <C>       <C>        <C>       <C>       <C>        <C>
ASSETS(4):
Interest-earning assets
  Loans(1)...................................  $64,369    $6,755    10.49%    $51,290    $5,252    10.24%
     Investments.............................      250        14     5.60         476        14     2.94
     Federal funds sold......................    4,633       255     5.50       6,840       367     5.37
                                               -------    ------    -----     -------    ------    -----
          Total earning assets...............   69,252     7,024    10.14      58,606     5,633     9.61
                                                          ------    -----                ------    -----
Non-earning assets...........................   10,000                          8,670
                                               -------                        -------
          Total Assets.......................  $79,252                        $67,276
                                               =======                        =======
LIABILITIES, MINORITY INTEREST AND
  STOCKHOLDER'S EQUITY(4):
     Savings and NOW accounts................  $32,224    $1,413     4.38%    $14,251    $  481     3.38%
     Money market deposits...................    3,606       128     3.55       3,889       132     3.39
     Certificates of deposit.................   20,728     1,158     5.59      24,697     1,377     5.58
     Borrowings..............................    3,550       221     6.23       8,766       560     6.39
                                               -------    ------    -----     -------    ------    -----
          Total interest-bearing
            liabilities......................   60,108     2,920     4.86      51,603     2,550     4.94
                                                          ------    -----                ------    -----
Non-interest bearing liabilities.............   11,446                          8,621
Minority interest............................      833                            754
Stockholder's equity.........................    6,865                          6,298
                                               -------                        -------
          Total liabilities, minority
            interest and stockholder's
            equity...........................  $79,252                        $67,276
                                               =======                        =======
Spread and Interest Differential:
Net interest income..........................             $4,104                         $3,083
                                                          ======                         ======
Interest-rate spread(2)......................                        5.28%                          4.67%
                                                                    =====                          =====
Net interest margin(3).......................                        5.93%                          5.26%
                                                                    =====                          =====
Ratio of average earning assets to average
  interest-bearing liabilities...............     1.15                           1.14
                                               =======                        =======
</TABLE>
 
                                       58
<PAGE>   67
 
<TABLE>
<CAPTION>
                                YEAR ENDED DECEMBER 31,        YEAR ENDED DECEMBER 31,        YEAR ENDED DECEMBER 31,
                                         1995                           1994                           1993
                              ---------------------------    ---------------------------    ---------------------------
                              AVERAGE              YIELD/    AVERAGE              YIELD/    AVERAGE              YIELD/
                              BALANCE   INTEREST    RATE     BALANCE   INTEREST    RATE     BALANCE   INTEREST    RATE
                              -------   --------   ------    -------   --------   ------    -------   --------   ------
                                                               (DOLLARS IN THOUSANDS)
<S>                           <C>       <C>        <C>       <C>       <C>        <C>       <C>       <C>        <C>
ASSETS(4):
Interest-earning assets
  Loans(1)..................  $45,672    $4,728    10.35%    $36,049    $3,758    10.42%    $39,815    $3,629     9.11%
    Investments.............      810         6     0.74       2,797        53     1.89       2,710        55     2.03
    Federal funds sold......    7,218       436     6.04       4,801       190     3.96       4,441       129     2.90
                              -------    ------    -----     -------    ------    -----     -------    ------     ----
         Total earning
           assets...........   53,700     5,170     9.63      43,647     4,001     9.17      46,966     3,813     8.12
                                         ------    -----     -------              -----     -------               ----
Non-earning assets..........    4,878                          4,511                          5,833
                              -------                        -------                        -------
         Total Assets.......  $58,578                        $48,158                        $52,799
                              =======                        =======                        =======
LIABILITIES, MINORITY
  INTEREST AND STOCKHOLDER'S
  EQUITY(4):
    Savings and NOW
      accounts..............  $ 9,301    $  218     2.34%    $11,079    $  263     2.37%    $ 9,626    $  243     2.52%
    Money market deposits...    3,545       110     3.10       5,055       133     2.63       5,072       151     2.98
    Certificates of
      deposit...............   23,479     1,351     5.75      14,389       594     4.13      14,383       609     4.23
    Borrowings..............   10,694       627     5.86       7,270       442     6.08      14,189       737     5.19
                              -------    ------    -----     -------    ------    -----     -------    ------     ----
         Total
           interest-bearing
           liabilities......   47,019     2,306     4.90      37,793     1,432     3.79      43,270     1,740     4.02
                                         ------    -----     -------              -----     -------               ----
Non-interest bearing
  liabilities...............    5,893                          5,116                          5,049
Minority interest...........      657                            554                            484
Stockholder's equity........    5,009                          4,695                          3,996
                              -------                        -------                        -------
         Total liabilities,
           minority interest
           and stockholder's
           equity...........  $58,578                        $48,158                        $52,799
                              =======                        =======                        =======
Spread and Interest
  Differential:
Net interest income.........             $2,864                         $2,569                         $2,073
                                         ======                         ======                         ======
Interest-rate spread(2).....                        4.73%                          5.38%                         4.10%
                                                   =====                          =====                           ====
Net interest margin(3)......                        5.33%                          5.89%                         4.41%
                                                   =====                          =====                           ====
Ratio of average earning
  assets to average
  interest-bearing
  liabilities...............     1.14                           1.15                           1.09
                              =======                        =======                        =======
</TABLE>
 
- ---------------
 
(1) Includes loans on non-accrual status.
(2) Interest-rate spread represents the excess of the average yield on
    interest-earning assets over the average cost of interest-bearing
    liabilities.
(3) Net interest margin represents net interest income (annualized) divided by
    average interest-earning assets.
(4) Average balances are based upon average daily balances for the Bank,
    month-end balances for the Mortgage Company (as daily balances are
    unavailable), and quarter-end balances for InterWest (as daily or monthly
    balances are unavailable).
 
                                       59
<PAGE>   68
 
  Net Interest Income
 
     Net interest income, which constitutes the principal source of income for
InterWest, represents the excess of interest income on interest-earning assets
over interest expense on interest-bearing liabilities. The principal interest
earning assets are federal funds sold, investment securities and loans
receivable. Interest-bearing liabilities primarily consist of time deposits,
interest-bearing checking accounts ("NOW accounts"), savings deposits and money
market accounts. Funds attracted by these interest-bearing liabilities are
invested in interest earning assets. Accordingly, net interest income depends
upon the volume of average interest-earning assets and average interest-bearing
liabilities and the interest rates earned or paid on them.
 
     The following table sets forth certain information regarding changes in
InterWest's interest income and interest expense during the year ended December
31, 1997 as compared to the year ended December 31, 1996, and for the six months
ended June 30, 1998 as compared to the six months ended June 30, 1997. For each
category of interest-earning assets and interest-bearing liabilities,
information is provided on changes attributable to (1) changes in interest rate
(change in rate multiplied by prior volume), (2) changes in volume (change in
volume multiplied by prior rate) and (3) changes in rate-volume (changes in rate
multiplied by change in volume).
 
<TABLE>
<CAPTION>
                                                            SIX MONTHS ENDED JUNE 30,           YEAR ENDED DECEMBER 31,
                                                                  1998 VS. 1997                      1997 VS. 1996
                                                         --------------------------------   -------------------------------
                                                            INCREASE (DECREASE) DUE TO        INCREASE (DECREASE) DUE TO
                                                         --------------------------------   -------------------------------
                                                                          RATE/                             RATE/
                                                         RATE    VOLUME   VOLUME   TOTAL    RATE   VOLUME   VOLUME   TOTAL
                                                         -----   ------   ------   ------   ----   ------   ------   ------
                                                                               (DOLLARS IN THOUSANDS)
<S>                                                      <C>     <C>      <C>      <C>      <C>    <C>      <C>      <C>
Interest-earning assets:
  Loans................................................  $(257) $1,567    $(133)   $1,177   $131  $1,339    $  33    $1,503
  Investments..........................................      1       5        1         7     13      (7)      (6)        0
  Federal funds sold...................................      1     168        2       171      9    (118)      (3)     (112)
                                                         -----   ------   -----    ------   ----   ------   -----    ------
        Total interest-earning assets..................   (255)  1,740     (130)    1,355    153   1,214       24     1,391
                                                         -----   ------   -----    ------   ----   ------   -----    ------
Interest-bearing liabilities:
  Savings and NOW accounts.............................      0     106        0       106    144     607      181       932
  Money market deposits................................      5      19        2        26      6     (10)       0        (4)
  Certificates of deposit..............................     37     585       40       662      3    (221)      (1)     (219)
  Borrowings...........................................      6      50        3        59    (15)   (333)       9      (339)
                                                         -----   ------   -----    ------   ----   ------   -----    ------
        Total interest-bearing liabilities.............     48     760       45       853    138      43      189       370
                                                         -----   ------   -----    ------   ----   ------   -----    ------
Net change in net-interest income......................  $(303)  $ 980    $(175)   $  502   $ 15  $1,171    $(165)   $1,021
                                                         =====   ======   =====    ======   ====   ======   =====    ======
</TABLE>
 
     InterWest's net interest income was $2.3 million for the six months ended
June 30, 1998 compared to $1.8 million for the six months ended June 30, 1997,
an increase of $.5 million or 27.1%. The change resulted primarily from an
increase in earning assets of $36.3 million or 56.7%. Net interest income was
$4.1 million for the year ended December 31, 1997 compared with $3.1 million for
the year ended December 31, 1996, an increase of $1.0 million or 33.1%.
 
     During the six month period ended June 30, 1998, interest income on loans
increased by $1.2 million from the six month period ended June 30, 1997. This
increase was attributable primarily to an increase of $29.9 million in average
balances of loans from $57.9 million for the six months ended June 30, 1997 to
$87.8 million for the six months ended June 30, 1998. Interest income on loans
for the period was affected negatively by a declining interest rate environment
resulting from increased competition. Interest income on loans increased $1.5
million from the year ended December 31, 1996 to year ended December 31, 1997.
Most of this increase was attributable to an increase in average balances of
loans. During the six month period ended June 30, 1998, interest income on
investments and federal funds sold increased by $178 thousand from the six month
period ended June 30, 1997. This increase was attributable almost entirely to an
increase of $6.4 million in average balances of investments and federal funds
sold from $6.2 million for the six months ended June 30, 1997 to $12.6 million
for the six months ended June 30, 1998. Interest income on investments and
federal funds sold decreased $112 thousand from the year ended December 31, 1996
to year ended December 31, 1997. Most of this decrease was attributable to a
decrease in investable federal fund balances.
 
                                       60
<PAGE>   69
 
     During the six months ended June 30, 1998, interest expense on interest
bearing liabilities increased by $853 thousand over the six month period ended
June 30, 1997. Most of this increase was attributable to an increase of $29.4
million in average interest bearing liabilities from $57.1 million for the six
months ended June 30, 1997, to $86.5 million for six months ended June 30, 1998.
Interest expense on interest bearing liabilities increased $370 thousand from
$2.5 million for the year ended December 31, 1996, to $2.9 million for the year
ended December 31, 1997. This increase was primarily attributable to an increase
in NOW account rates paid. A NOW account type titled "Gold Account" provided
extremely competitive rates for high minimum balance accounts with the objective
of increasing deposits. NOW accounts as a group became a higher yielding
interest bearing liability as a result of the introduction of "GOLD Accounts"
and their sudden growth.
 
  Provision for Loan Losses
 
     The provision for loan losses is charged to earnings to bring the allowance
for loan losses to a level deemed appropriate by management and is based upon
historical experience, the volume and type of lending conducted by the Bank, the
amounts of non-performing loans, general economic conditions, particularly as
they relate to the Bank's market area, and other factors related to the
collectibility of the Bank's loan portfolio. For the six months ended June 30,
1998, the provision for loan losses was $126,000, as compared to $150,000 for
the six months ended June 30, 1997. This decrease of $24,000 was attributable
solely to management's desire to maintain reserves at an appropriate level. For
the year ended December 31, 1997, the provision for loan losses was $270,000 as
compared to $60,000 for the year ended December 31, 1996, an increase of
$210,000.
 
  Noninterest Income
 
     Noninterest income is primarily composed of mortgage origination fees and
deposit service charges and fees. Noninterest income was $4.2 million for the
six months ended June 30, 1998 versus $3.4 million for the six months ended June
30, 1997, for an increase of $.8 million, or 22.6%. This increase was
attributable primarily to an increase of $.7 million in Mortgage Company fee
income. During the year ended December 31, 1997, noninterest income increased to
$7.4 million from $6.4 million during the year ended December 31, 1996, an
increase of $1.0 million, or 14.7%. This increase was attributable primarily to
an increase of $1.0 million in Mortgage Company fee income. The Mortgage Company
is a volume based fee income generator and management believes that fee income
should be shown separate of interest income. The following table details income
from loans separating interest income on loan balances from fee income generated
by the Mortgage Company.
 
<TABLE>
<CAPTION>
                                       SIX MONTHS
                                     ENDED JUNE 30,               YEAR ENDED DECEMBER 31,
                                     ---------------   ----------------------------------------------
                                      1998     1997     1997      1996      1995      1994     1993
                                     ------   ------   -------   -------   -------   ------   -------
                                                          (DOLLARS IN THOUSANDS)
<S>                                  <C>      <C>      <C>       <C>       <C>       <C>      <C>
Loan Income
  Included in interest income:
     Interest income including late
       charges and amortization of
       fees on loans with
       outstanding balances........  $4,209   $3,032   $ 6,755   $ 5,252   $ 4,728   $3,758   $ 3,629
  Included in other income:
     Fee income on mortgage loans
       originated and then sold in
       the secondary market
       including origination fees,
       servicing released premiums,
       marketing gain/loss and
       servicing fees..............   3,945    3,176     7,110     6,014     6,681    4,420     8,860
                                     ------   ------   -------   -------   -------   ------   -------
          Total loan income........  $8,154   $6,208   $13,865   $11,266   $11,409   $8,178   $12,289
                                     ======   ======   =======   =======   =======   ======   =======
</TABLE>
 
                                       61
<PAGE>   70
 
  Noninterest Expenses
 
     During the six months ended June 30, 1998, noninterest expenses increased
to $5.5 million from $4.7 million during the six months ended June 30, 1997, or
an increase of 16.9%. During the year ended December 31, 1997, noninterest
expenses increased to $10.0 million from $7.8 million during the year ended
December 31, 1996, an increase of $2.2 million, or 28.6%. The following sets
forth additional information on certain noninterest expense categories which had
significant changes.
 
     During the six months ended June 30, 1998, compensation and benefits were
$3.4 million compared to $3.0 million for the six months ended June 30, 1997, an
increase of $.4 million, or 14.0%. During the year ended December 31, 1997,
compensation and benefits increased to $6.5 million from $5.0 million during the
year ended December 31, 1996, an increase of $1.5 million or 30.6%. These
changes were primarily due to an increase in the number of employees at the Bank
commensurate with the growth of the Bank, increased commissions paid to Mortgage
Company's loan officers, an overall increase in wages due to the Mortgage
Company only reflecting ten months of expenses in 1996, and annual compensation
and benefit increases for employees.
 
     Occupancy and related furniture and equipment expenses were $589 thousand
during the six months ended June 30, 1998 compared to $554 thousand during the
six months ended June 30, 1997, an increase of $35 thousand or 6.3%. For the
year ended December 31, 1997, occupancy and related furniture and equipment
expenses increased to $1.0 million compared to $.8 million for the period ending
December 31, 1996, an increase of $.2 million or 27.7%. The reason for the
increase in occupancy related expenses for the year to date periods ended
December 31, 1997 and December 31, 1996 was because of the Bank's expansion into
the new main branch in the 2nd quarter 1996, a third branch in the fourth
quarter 1996 and a fourth branch in the 4th quarter 1997.
 
  Other Noninterest Expense
 
     For the six months ended June 30, 1998, other noninterest expense increased
to $1.5 million from $1.2 million for June 30, 1997, an increase of $.3 million,
or 29.1%. For the year ended December 31, 1997, other noninterest expense
increased to $2.5 million from $2.0 million at December 31, 1996, an increase of
$.5 million or 23.8%. The cause for the increase was increases in expenses
associated with an increased number of loan originations at the Mortgage
Company, increased amortization of mortgage servicing rights capitalized at the
Mortgage Company, and increased costs of data processing at the Bank due to
larger numbers of items processed, more ATM's to support and process, and a
larger ATM card base to support.
 
  Income Tax Provision
 
     During the six months ended June 30, 1998 the income tax provision
increased to $319 thousand from $145 thousand for the six month period ended
June 30, 1997, an increase of $174 thousand, or 120.0%. For the year ended
December 31, 1997, the income tax provision decreased to $416 thousand from $555
thousand, or 25.1%. The increases and decreases in the income tax provision are
commensurate with the increases and decreases in net income before taxes for the
comparable periods.
 
  Asset/Liability Management
 
     A principal objective of the Bank's asset/liability management strategy is
to minimize its exposure to changes in interest rates by matching the maturity
and repricing horizons of interest-earning assets and interest-bearing
liabilities. The strategy is overseen in part through the direction of the
Bank's Asset and Liability Committee (the "ALCO Committee") which establishes
policies and monitors results to control interest rate sensitivity.
 
     Management evaluates interest rate risk and then formulates guidelines
regarding asset generation and repricing, funding sources and pricing, and
off-balance sheet commitments in order to maintain interest rate risk within
target levels for the appropriate level of risk determined by the ALCO
Committee.
 
                                       62
<PAGE>   71
 
     As a part of the Bank's interest-rate risk management policy, the ALCO
Committee examines the extent to which its assets and liabilities are
"interest-rate sensitive" and monitors the Bank's interest-rate sensitivity
"gap". An asset or liability is considered to be interest-rate sensitive if it
will reprice or mature within the time period analyzed, usually one year or
less. The interest-rate sensitivity gap is the difference between interest-
earning assets and interest-bearing liabilities scheduled to mature or reprice
within such time period. A gap is considered positive when the amount of
interest-rate sensitive assets exceeds the amount of interest-rate sensitive
liabilities. A gap is considered negative when the amount of interest rate
sensitive liabilities exceeds interest rate sensitive assets. During a period of
rising interest rates, a negative gap would tend to adversely affect net
interest income. During a period of falling interest rates, a negative gap would
tend to result in an increase of net interest income, while a positive gap would
tend to adversely affect net interest income. A simple interest rate "gap"
analysis by itself may not be an accurate indicator of how net interest income
will be affected by changes in interest rates. Accordingly, the ALCO Committee
also evaluates how the repayment of particular assets and liabilities is
impacted by changes in interest rates. Income associated with interest-earning
assets and costs associated with interest-bearing liabilities may not be
affected uniformly by changes in interest rates. In addition the magnitude and
duration of changes in interest rates may have a significant impact on net
interest income. For example, although certain assets and liabilities have
similar maturities or periods of repricing, they may react in different degrees
to changes in market interest rates. Interest rates on certain types of assets
and liabilities fluctuate in advance of changes in general market interest
rates, while interest rates on other types may lag behind changes in general
market rates. In addition, certain assets, such as adjustable-interest rate
mortgage loans, have features (generally referred to as "interest rate caps")
which limit changes in interest rates on a short-term basis and over the life of
the asset. In the event of a change in interest rates, repayments (on loans and
mortgage-backed securities) and early withdrawal (of deposit accounts) levels
also could deviate significantly from those assumed in calculating the interest
gap. The ability of many borrowers to service their debts also may decrease in
the event of an interest rate increase.
 
     Management's strategy is to maintain a relatively balanced interest-rate
risk position to protect its net interest margin from market fluctuations. To
this end, the ALCO Committee reviews, on a monthly basis, the maturity and
repricing of assets and liabilities.
 
     Management believes that the type and the amount of the Bank's interest
rate sensitive liabilities may reduce the potential impact that a rise in
interest rates might have on the Bank's net interest income. The Bank seeks to
maintain a core deposit base by providing quality services to its customers
without significantly increasing its cost of funds or operating expenses. The
Bank also maintains a portfolio of liquid assets in order to reduce its overall
exposure to changes in market interest rates. At December 31, 1997 and June 30,
1998, the InterWest's liquidity ratios were 15.25% and 22.45%, respectively. The
Bank also maintains a "floor", or minimum rate, on certain of its floating or
prime based loans. These floors allow the Bank to continue to earn a higher rate
when the floating rate falls below the established floor rate.
 
                                       63
<PAGE>   72
 
     The following table sets forth certain information on InterWest's
interest-earning assets and interest bearing liabilities at June 30, 1998 that
are estimated to mature or are scheduled to reprice within the periods shown.
 
<TABLE>
<CAPTION>
                                                                                            MORE
                                                                           ONE YEAR TO      THAN
                                 0 TO 30 DAYS   31-90 DAYS   91-365 DAYS   FIVE YEARS    FIVE YEARS    TOTAL
                                 ------------   ----------   -----------   -----------   ----------   --------
                                                            (DOLLARS IN THOUSANDS)
<S>                              <C>            <C>          <C>           <C>           <C>          <C>
Earning Assets:
  Loans........................    $55,611       $  4,622     $ 11,029       $18,715      $ 4,903     $ 94,880
  Investments..................        297              0            0             0            0          297
  Federal Funds Sold...........     22,896              0            0             0            0       22,896
                                   -------       --------     --------       -------      -------     --------
          Total
            Interest-Earning
            Assets.............     78,804          4,622       11,029        18,715        4,903      118,073
                                   -------       --------     --------       -------      -------     --------
Interest-Bearing Liabilities:
  Savings and NOW accounts.....          0         33,066            0         3,497            0       36,563
  Money Market Accounts........          0          4,737            0             0            0        4,737
  Certificate of deposits......      3,878         10,976       31,715         2,744            0       49,313
  Borrowings...................      5,217              1            5            19            0        5,242
                                   -------       --------     --------       -------      -------     --------
          Total
            Interest-Bearing
            Liabilities........      9,095         48,780       31,720         6,260            0       95,855
                                   -------       --------     --------       -------      -------     --------
Rate Sensitivity GAP...........    $69,709       $(44,158)    $(20,691)      $12,455      $ 4,903     $ 22,218
                                   =======       ========     ========       =======      =======     ========
Cumulative Rate Sensitivity
  GAP..........................    $69,709       $ 25,551     $  4,860       $17,315      $22,218
                                   =======       ========     ========       =======      =======
Rate Sensitivity GAP Ratio.....      59.04%        -37.40%      -17.52%        10.55%        4.15%
                                   =======       ========     ========       =======      =======
Cumulative Rate Sensitivity GAP
  Ratio........................      59.04%         21.64%        4.12%        14.66%       18.82%
                                   =======       ========     ========       =======      =======
Ratio of Cumulative GAP to
  Total Assets.................      53.44%         19.59%        3.73%        13.27%       17.03%
                                   =======       ========     ========       =======      =======
</TABLE>
 
- ---------------
 
(1) In preparing the table above, adjustable-interest rate loans were included
    in the period in which the interest rates are next scheduled to adjust
    rather than in the period in which the loans mature. Fixed interest rate
    loans were scheduled according to their contractual maturities.
(2) In preparing the table above, loans available for sale were scheduled
    according to their anticipated settlement date with the secondary investor;
    the majority of the loans are scheduled to settle in 30 days or less.
(3) Time deposits were scheduled according to their contractual maturities.
(4) Loans on non-accrual have been excluded.
 
     The Mortgage Company's interest-rate risk may occur at two different
intervals. The first would occur when a borrower locks in a particular yield on
a loan with the Mortgage Company and that loan is either then committed at a
comparable yield with a secondary market investor or hedged until the time a
secondary investor actually purchases the loan. The risk would be that market
yields change dramatically in a short period of time and a difference occurs in
the commitment price a secondary investor is willing to pay for committed loans.
There is also the risk that the hedging process would be inadequate and
offsetting securities gains would not be sufficient to offset yield differences
in hedged loans sold at a loss at a later date. In these circumstances, the
result would be an immediate loss reflected when the loans are either committed
or sold. Management is of the opinion that the procedures for committing loans
to investors and for hedging loans in the secondary market is sufficient and
does limit the risk of loss to a minimum. The second risk would be the pricing
difference between the rate it receives on its loans outstanding and the rate
it's charged on its borrowings on the line of credit with U.S. Bank N.A. The
individual amounts borrowed on the line of credit
 
                                       64
<PAGE>   73
 
are collateralized by the individual loans outstanding and do not exceed 100% of
the individual loan balances outstanding.
 
FINANCIAL CONDITION
 
  Lending Activities
 
     A significant source of InterWest's income is the interest earned on its
loan portfolio. The following table shows the relationship of loans to total
assets for the Bank as of the dates indicated:
 
<TABLE>
<CAPTION>
                                                                       AT DECEMBER 31,
                                                       AT JUNE 30,    ------------------
                                                          1998         1997       1996
                                                       -----------    -------    -------
                                                            (DOLLARS IN THOUSANDS)
<S>                                                    <C>            <C>        <C>
Total Assets.........................................   $130,454      $99,159    $74,786
Total Loans, net.....................................     94,585       77,867     57,202
Loans as a % of Total Assets.........................      72.50%       78.53%     76.49%
</TABLE>
 
     Lending activities are conducted pursuant to a written policy which has
been adopted by the Bank. Each loan officer has defined lending authority beyond
which loans, depending upon their type and size, must be reviewed and approved
by a loan committee comprised of certain officers and directors of the Bank.
Lending activities by the Mortgage Company are conducted pursuant to industry
guidelines and investor requirements. The majority of Mortgage Company lending
decisions are approved by underwriters within the Mortgage Company who have met
the industry requirements for direct endorsement lending.
 
     The composition of InterWest's loan portfolio was as follows at the dates
indicated:
 
<TABLE>
<CAPTION>
                                                                AS OF JUNE 30,
                                                      -----------------------------------
                                                            1998               1997
                                                      ----------------   ----------------
                                                                 % OF               % OF
                                                      AMOUNT    TOTAL    AMOUNT    TOTAL
                                                      -------   ------   -------   ------
                                                            (DOLLARS IN THOUSANDS)
<S>                                                   <C>       <C>      <C>       <C>
Commercial..........................................  $14,972    15.61%  $ 6,359     9.63%
Construction........................................   21,299    22.21    20,326    30.78
Real Estate.........................................   55,547    57.92    37,058    56.12
Consumer and other..................................    4,084     4.26     2,287     3.47
                                                      -------   ------   -------   ------
          Total loans receivable....................   95,902   100.00%   66,030   100.00%
                                                                ======             ======
Less:
  Unearned income and fees..........................     (367)              (292)
  Allowance for loan losses.........................     (950)    0.99%     (704)    1.07%
                                                      -------   ======   -------   ======
  Loans, net........................................  $94,585            $65,034
                                                      =======            =======
</TABLE>
 
<TABLE>
<CAPTION>
                                                                        AS OF DECEMBER 31,
                                 ------------------------------------------------------------------------------------------------
                                       1997                1996                1995                1994                1993
                                 ----------------    ----------------    ----------------    ----------------    ----------------
                                            % OF                % OF                % OF                % OF                % OF
                                 AMOUNT    TOTAL     AMOUNT    TOTAL     AMOUNT    TOTAL     AMOUNT    TOTAL     AMOUNT    TOTAL
                                 -------   ------    -------   ------    -------   ------    -------   ------    -------   ------
                                                                      (DOLLARS IN THOUSANDS)
<S>                              <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>
Commercial.....................  $10,064    12.73%   $ 4,129     7.11%   $ 2,454     4.80%   $ 3,133     7.97%   $ 2,800     7.76%
Construction...................   20,556    26.01     18,423    31.71     16,974    33.20     14,792    37.65      9,378    26.02
Real Estate....................   45,970    58.17     33,637    57.91     29,995    58.67     20,045    51.02     22,255    61.74
Consumer and other.............    2,441     3.09      1,897     3.27      1,703     3.33      1,318     3.36      1,614     4.48
                                 -------   ------    -------   ------    -------   ------    -------   ------    -------   ------
   Total loans receivable......   79,031   100.00%    58,086   100.00%    51,126   100.00%    39,288   100.00%    36,047   100.00%
                                           ======              ======              ======              ======              ======
Less:
 Unearned income and fees......     (341)               (300)               (201)               (196)               (191)
 Allowance for loan losses.....     (823)    1.04%      (584)    1.01%      (538)    1.05%      (464)    1.18%      (407)    1.13%
                                 -------   ======    -------   ======    -------   ======    -------   ======    -------   ======
 Loans, net....................  $77,867             $57,202             $50,387             $38,628             $35,449
                                 =======             =======             =======             =======             =======
</TABLE>
 
                                       65
<PAGE>   74
 
     As of June 30, 1998, the maturities and interest rate sensitivities of the
InterWest's loan portfolio, based on remaining scheduled principal repayments,
were as follows:
 
<TABLE>
<CAPTION>
                                                              DUE AFTER
                                                 DUE IN ONE    ONE YEAR
                                                  YEAR OR      THROUGH     DUE AFTER
                                                    LESS      FIVE YEARS   FIVE YEARS    TOTAL
                                                 ----------   ----------   ----------   -------
                                                             (DOLLARS IN THOUSANDS)
<S>                                              <C>          <C>          <C>          <C>
Commercial.....................................   $10,945      $ 3,189       $  838     $14,972
Construction...................................    20,205          906          188      21,299
Real Estate....................................    38,469       13,509        3,569      55,547
Consumer and other.............................     2,666        1,415            3       4,084
                                                  -------      -------       ------     -------
          Total loans receivable...............   $72,285      $19,019       $4,598     $95,902
                                                  =======      =======       ======     =======
Loans with maturities over one year:
  Fixed interest rate..........................                $16,705       $3,712     $20,417
  Variable interest rate.......................                  2,314          886       3,200
                                                               -------       ------     -------
          Total maturities greater than one
            year...............................                $19,019       $4,598     $23,617
                                                               =======       ======     =======
</TABLE>
 
ASSET QUALITY
 
     Management seeks to maintain asset quality through sound underwriting and
sound lending practices. The largest category of loans in the InterWest's loan
portfolio are collateralized by real estate mortgages. As of June 30, 1998 and
December 31, 1997, 80.13%, and 84.18%, respectively, of the total loan portfolio
were collateralized by real estate. The level of delinquent loans and other real
estate owned also is relevant to the credit quality of a loan portfolio.
 
     The real estate mortgage loans in the Bank's portfolio consist of fixed-and
adjustable-interest rate loans which were originated at prevailing market
interest rates. The Bank's policy has been to originate real estate mortgage
loans predominantly in its primary market area. Real estate mortgage loans are
generally made in amounts that do not exceed a percentage of the appraised value
of the property securing the loan. Loan to appraised values can range from 50%
to 90% of the appraised value of the property securing the loan depending upon
the kind of transaction financed. The Bank's limits are set within the
guidelines of FDIC regulation 12CFR 365, Real Estate Lending Standards. The Bank
also purchases real estate loans from the Mortgage Company with loan to
appraised values that conform to accepted FHA and VA standards. In marketing
real estate loans, the Bank primarily considers the financial resources and
"debt to income ratio" of the borrower, the marketability of the collateral and
the Banks lending experience with the borrower.
 
     The Bank provides its real estate loans on the basis of the borrower's
ability to make repayment from his or her employment and other income, and which
are collateralized by real property whose value tends to be more readily
ascertainable.
 
     Commercial loans typically are underwritten on the basis of borrower's
ability to make repayment from the cash flow of his or her business and,
generally, are collateralized by business assets, such as accounts receivable,
equipment and inventory. As a result, the availability of funds for the
repayment of commercial loans may be substantially dependent on the success of
the business itself, which is subject to adverse conditions in the economy.
Commercial loans also entail certain additional risks since they usually involve
large loan balances to single borrowers or a related group of borrowers,
resulting in a more concentrated loan portfolio. Further, the collateral
underlying the loans may depreciate over time, cannot be appraised with as much
precision as residential real estate, and may fluctuate in value based on the
success of the business.
 
     Loan concentrations are defined as amounts loaned to a number of borrowers
engaged in similar activities which would cause them to be similarly impacted by
economic or other conditions. The Bank monitors these concentrations on a
quarterly basis in order to consider adjustments in its lending practices to
reflect economic conditions, loan to deposit ratio, and industry trends.
Management believes as of June 30, 1998 and December 31, 1997, that the Bank had
a significant concentration in real estate secured loans. Bank loan
 
                                       66
<PAGE>   75
 
customers are principally closely-held businesses and residents concentrated in
Nevada and, as such, the debtors' ability to honor their contract is
substantially dependent upon the general economic conditions of the region. Most
of the Bank's business activity is with customers located in Nevada.
 
     The Bank concentrates its efforts and resources, and that of its senior
management and lending officers, on loan review and underwriting procedures.
Internal controls include ongoing reviews of loans made to monitor documentation
and the existence and valuations of collateral. In addition, management of the
Bank has established a review process with the objective of identifying,
evaluating, and initiating necessary corrective action for marginal loans. The
goal of the loan review process is to identify and address classified and
non-performing loans as early as possible.
 
CLASSIFICATION OF ASSETS
 
     Generally, interest on loans accrues and is credited to income based upon
the principal balance outstanding. It is management's policy to discontinue the
accrual of interest income and classify a loan in nonaccrual status when in the
opinion of management, principal or interest is not likely to be paid in
accordance with the terms and obligation or when principal or interest is past
due 90 days, unless in the determination of management, the principal and
interest on the loan are well collateralized and in the process of collection.
Consumer installment loans are generally charged-off when a loss is realized
unless adequately collateralized and in the process of collection. Loans are not
returned to accrual status until principal and interest payments are brought
current and future payments appear reasonably certain. Interest accrued and
unpaid at the time a loan is placed on non-accrual status is charged against
interest income.
 
     Real estate acquired by InterWest as a result of foreclosure or by deed in
lieu of foreclosure is classified as other real estate owned ("OREO"). OREO
properties are recorded at the lower of cost or fair value less estimated
selling costs, and the estimated loss, if any, is charged to the allowance for
credit losses at the time it is transferred to OREO. Further write-downs in OREO
are recorded at the time management believes additional deterioration in value
has occurred and are charged to non-interest expense.
 
     Commercial loans, unlike residential mortgage loans, which, generally, are
made on the basis of the borrower's ability to make repayment from his or her
employment and other income, and which are collateralized by real property whose
value tends to be more readily ascertainable, typically are underwritten on the
basis of borrower's ability to make repayment from the cash flow of his or her
business and, generally, are collateralized by business assets, such as accounts
receivable, equipment and inventory. As a result, the availability of funds for
the repayment of commercial loans may be substantially dependent on the success
of the business itself, which is subject to adverse conditions in the economy.
Commercial loans also entail certain additional risks since they usually involve
large loan balances to single borrowers or a related group of borrowers,
resulting in a more concentrated loan portfolio. Further, the collateral
underlying the loans may depreciate over time, cannot be appraised with as much
precision as residential real estate, and may fluctuate in value based on the
success of the business.
 
                                       67
<PAGE>   76
 
     Loans on non-accrual status and other real estate owned, the ratio of such
loans and real estate owned to total assets, and certain other related
information was as follows at the dates indicated:
 
<TABLE>
<CAPTION>
                                       AT AND FOR THE SIX
                                          MONTHS ENDED          AT AND FOR THE YEAR ENDED
                                       -------------------   --------------------------------
                                       06/30/98   06/30/97   1997   1996   1995   1994   1993
                                       --------   --------   ----   ----   ----   ----   ----
                                                       (DOLLARS IN THOUSANDS)
<S>                                    <C>        <C>        <C>    <C>    <C>    <C>    <C>
Loans on non-accrual status:
  Commercial.........................   $    0     $    2    $  1   $  3   $ 62   $  8   $ 10
  Construction.......................    1,022      1,153     636      0    260      0      0
  Real Estate........................        0        107       0     86    224    293    451
  Installment........................        0          0       0     10      0      0     17
                                        ------     ------    ----   ----   ----   ----   ----
          Total loans on non-accrual
            status...................    1,022      1,262     637     99    546    301    478
Accruing loans over 90 days
  delinquent.........................        0          0       0      0      0      0      0
                                        ------     ------    ----   ----   ----   ----   ----
          Total non-performing
            loans....................    1,022      1,262     637     99    546    301    478
Other real estate owned:.............      317        551     317    614    276    184    242
                                        ------     ------    ----   ----   ----   ----   ----
          Total non-performing
            assets...................   $1,339     $1,813    $954   $713   $822   $485   $720
                                        ======     ======    ====   ====   ====   ====   ====
As a percentage of total assets:
          Total non-performing
            loans....................     0.78%      1.60%   0.64%  0.13%  0.84%  0.57%  0.94%
                                        ======     ======    ====   ====   ====   ====   ====
          Total non-performing
            assets...................     1.03%      2.30%   0.96%  0.95%  1.27%  0.92%  1.42%
                                        ======     ======    ====   ====   ====   ====   ====
</TABLE>
 
     As of June 30, 1998 and December 31, 1997, loans on non-accrual status
totaled $1.02 million and $.63 million, respectively. Additionally, as of June
30, 1998, there were no loans over 30 days delinquent and on accrual.
 
ALLOWANCE FOR LOAN LOSSES
 
     In originating loans, the Bank recognizes that credit losses will be
experienced and that the risk of loss will vary with, among other things, the
type of loan being made, the credit worthiness of the borrower over the term of
the loan and, in the case of a collateralized loan, the quality of the
collateral for the loan, as well as general economic conditions. As a matter of
policy, the Bank maintains an allowance for loan losses. The amount provided for
loan losses during any period is based on an evaluation by management of the
amount needed to maintain the allowance at a level sufficient to cover
anticipated losses and the inherent risk of losses in the loan portfolio. In
determining the amount of the allowance, management considers the dollar amount
of loans outstanding, its assessment of known or potential problem loans,
current economic conditions, the risk characteristics of the various
classifications of loans, the credit record of its borrowers, the fair market
value of underlying collateral and other factors. Specific allowances are
provided for individual loans when the ultimate collection is considered
questionable by management after reviewing the current status of loans which are
contractually past due and considering the fair value of the underlying
collateral for each loan.
 
     Management continues to actively monitor the Bank's asset quality and to
charge-off loans against the allowance for loan losses when appropriate or to
provide specific loss allowances when necessary. Although management believes
that it uses the best information available at the time to make determinations
with respect to allowance for loan losses, subsequent adjustments to the
allowance for loan losses may be necessary if future economic conditions or
other facts differ from the assumptions used in making the initial
determinations or if regulatory policies change.
 
     The Mortgage Company's historical loan losses are nominal, at most. A loan
loss allowance has not been established at the Mortgage Company because of this
fact.
 
     At the six month period ended June 30, 1998, the allowance for loan losses
was $950 thousand, compared to $823 thousand at the year ended December 31,
1997, or an increase of $127 thousand. Total charged off loans, net of
recoveries, were $31 thousand for 1997 and $14 thousand for 1996. During the six
months ended June 30, 1998, total charged off loans, net of recoveries, were
($1) thousand.
 
                                       68
<PAGE>   77
 
     The activity in the Bank's allowance for loan losses was as follows for the
periods indicated:
 
<TABLE>
<CAPTION>
                             AT AND FOR THE SIX
                                MONTHS ENDED                  AT AND FOR THE YEAR ENDED
                             -------------------   -----------------------------------------------
                             06/30/98   06/30/97    1997      1996      1995      1994      1993
                             --------   --------   -------   -------   -------   -------   -------
                                                    (DOLLARS IN THOUSANDS)
<S>                          <C>        <C>        <C>       <C>       <C>       <C>       <C>
Allowance at beginning of
  period...................  $   823    $   584    $   584   $   538   $   464   $   407   $   458
Loans charged off:
  Commercial...............        0          0          0         4         0         2        10
  Construction.............        0          0          0         0         0         0         0
  Real Estate..............        0          0          0         0         0         0         0
  Installment..............        1         32         35        14         4        16        15
                             -------    -------    -------   -------   -------   -------   -------
         Total loans
           charged off.....        1         32         35        18         4        18        25
                             -------    -------    -------   -------   -------   -------   -------
Recoveries:
  Commercial...............        0          0          0         1         3         9        31
  Construction.............        0          0          0         0         0         0         0
  Real Estate..............        0          0          0         0         0         0         0
  Installment..............        2          2          4         3         5         6        20
                             -------    -------    -------   -------   -------   -------   -------
         Total
           recoveries......        2          2          4         4         8        15        51
                             -------    -------    -------   -------   -------   -------   -------
  Net loans charged off....        1        (30)       (31)      (14)        4        (3)       26
                             -------    -------    -------   -------   -------   -------   -------
Provision for loan losses
  charged to expense.......      126        150        270        60        70        60       (77)
                             -------    -------    -------   -------   -------   -------   -------
Allowance at end of
  period...................  $   950    $   704    $   823   $   584   $   538   $   464   $   407
                             =======    =======    =======   =======   =======   =======   =======
Net charge-offs as a
  percentage of average
  loans outstanding........     0.00%     -0.05%     -0.05%    -0.03%     0.01%    -0.01%     0.07%
                             =======    =======    =======   =======   =======   =======   =======
Allowance to period-end
  loans receivable.........     1.00%      1.08%      1.06%     1.02%     1.07%     1.20%     1.15%
                             =======    =======    =======   =======   =======   =======   =======
Average loans
  outstanding..............  $87,812    $57,901    $64,369   $51,290   $45,672   $36,049   $39,815
                             =======    =======    =======   =======   =======   =======   =======
Period-end total loans
  receivable...............  $94,585    $65,034    $77,867   $57,202   $50,387   $38,628   $35,449
                             =======    =======    =======   =======   =======   =======   =======
</TABLE>
 
INVESTMENT SECURITIES
 
     The total investment portfolio increased to $399 thousand as of December
31, 1997, from $153 thousand as of December 31, 1996, an increase of $246
thousand. The increase in investment securities in 1997 was due to changes in
the minimum amount of Federal Home Loan Bank stock required by membership. From
December 31, 1997 to June 30, 1998, the total investment portfolio decreased
$102 thousand due to changes in the minimum amount of Federal Home Loan Bank
stock required by membership.
 
     The following table sets forth the carrying value of the Bank's investment
portfolio at the dates indicated:
 
<TABLE>
<CAPTION>
                                                                         DECEMBER 31,
                                                              JUNE 30,   -------------
                                                                1998     1997    1996
                                                              --------   -----   -----
                                                               (DOLLARS IN THOUSANDS)
<S>                                                           <C>        <C>     <C>
Securities Available for Sale:
  Federal Home Loan Bank of San Francisco...................    $297     $399    $153
                                                                ====     ====    ====
</TABLE>
 
     The Bank has adopted Statement of Financial Accounting Standards No. 115
("FAS 115"), which requires companies to classify investments securities as
either held-to-maturity, available-for-sale, or trading securities. Securities
classified as held-to-maturity are carried at amortized cost. Securities
classified as available-for-sale are reported at fair value, with unrealized
gains and losses, net of tax effect, reported as a separate component of
stockholders' equity. Securities classified as trading securities are recorded
at fair value, with unrealized gains and losses included in earnings.
 
                                       69
<PAGE>   78
 
     The maturity distribution and certain other information pertaining to
investment securities was as follows at June 30, 1998:
 
<TABLE>
<CAPTION>
                                                              AMORTIZED   ESTIMATED
                                                                COST      FAIR VALUE   YIELD
                                                              ---------   ----------   -----
<S>                                                           <C>         <C>          <C>
Securities Available for Sale:
  Federal Home Loan Bank of San Francisco...................    $297         $297      6.68%
                                                                ====         ====      ====
</TABLE>
 
DEPOSIT ACTIVITIES
 
     Deposits are the major source of the Bank's funds for lending and other
investments purposes. Deposits are attracted principally from within the Bank's
primary market area through the offering of a broad variety of deposit
instruments including checking accounts, money market accounts, regular savings
accounts, term certificate accounts (including "jumbo" certificates in
denominations of $100,000 or more) and retirement savings plans.
 
     The distribution by type of the Bank's deposit accounts was as follows at
the dates indicated:
 
<TABLE>
<CAPTION>
                                     AS OF JUNE 30,                           AS OF DECEMBER 31,
                                   -------------------   ------------------------------------------------------------
                                          1998                  1997                 1996                 1995
                                   -------------------   ------------------   ------------------   ------------------
                                                % OF                 % OF                 % OF                 % OF
                                    AMOUNT    DEPOSITS   AMOUNT    DEPOSITS   AMOUNT    DEPOSITS   AMOUNT    DEPOSITS
                                   --------   --------   -------   --------   -------   --------   -------   --------
                                                                  DOLLARS IN THOUSANDS
<S>                                <C>        <C>        <C>       <C>        <C>       <C>        <C>       <C>
Demand Deposits..................  $ 25,115     21.70%   $17,795     19.92%   $ 8,739     13.97%   $ 5,373     12.27%
NOW accounts.....................    33,066     28.57     30,966     34.67     22,068     35.28      5,715     13.06
Money market accounts............     4,737      4.09      3,708      4.15      4,049      6.47      3,788      8.65
Savings accounts.................     3,497      3.02      3,268      3.66      3,809      6.09      3,303      7.55
Time deposits:
  Under $100,000.................    27,433     23.71     23,739     26.58     16,196     25.90     18,616     42.52
  $100,000 and over..............    21,880     18.91      9,838     11.02      7,687     12.29      6,983     15.95
                                   --------    ------    -------    ------    -------    ------    -------    ------
        Total deposits...........  $115,728    100.00%   $89,314    100.00%   $62,548    100.00%   $43,778    100.00%
                                   ========    ======    =======    ======    =======    ======    =======    ======
</TABLE>
 
     Time deposits included individual retirement accounts ("IRAs") totaling
$1.8 million, $1.7 million and $1.5 million at June 30, 1998 and December 31,
1997 and 1996, respectively, all of which were in the form of certificates of
deposit.
 
     The Bank's deposits increased to $89.3 million as of December 31, 1997,
from $62.5 million as of December 31, 1996, an increase of $26.8 million or
42.8%. This growth can be attributed to providing deposit products at
competitive prices.
 
     Maturity terms, service fees and withdrawal penalties are established by
the Bank on a periodic basis. The determination of rates and terms is predicated
on funds acquisition and liquidity requirements, rates paid by competitors,
growth goals and federal regulations.
 
     FDIC regulations limit the ability of certain insured depository
institutions to accept, renew, or rollover deposits by offering rates of
interest which are significantly higher than the prevailing rates of interest on
deposits offered by other insured depository institutions having the same type
of charter in such depository institutions' normal market area. Under these
regulations, "well capitalized" depository institutions may accept, renew, or
roll over deposits at such rates without restriction, "adequately capitalized"
depository institutions may accept, renew or roll over deposits at such rates
with a waiver from the FDIC (subject to certain restrictions on payments of
rates), and "undercapitalized" depository institutions may not accept, renew or
roll over deposits at such rates. As of December 31, 1997 and June 30, 1998, the
Bank met the definition of an "adequately capitalized" depository institution.
The Bank maintained, as of December 31, 1997 and June 30, 1998, "brokered
deposits" in the amount $10.7 million and $7.7 million, respectively. A waiver
of the restriction on accepting or renewing "brokered deposits" was obtained. It
is anticipated that all of the "brokered deposits" will mature and be redeemed
prior to the expiration of the waiver. Bank management believes the Bank does
not have a concentration of deposits from any one source, the loss of which
would have a material adverse effect. Management believes that, with the
exception of the above mentioned "brokered deposits", substantially all of the
Bank's depositors are residents in its primary market area.
 
                                       70
<PAGE>   79
 
     Time deposits of $100,000 and over, and other large deposit accounts tend
to be short-term in nature and more sensitive to changes in interest rates than
other types of deposits and, therefore, may be a less stable source of funds. In
the event that existing short-term deposits are not renewed, the resulting loss
of the deposited funds could adversely affect the Bank's liquidity. In a rising
interest rate market, such short-term deposits may prove to be a costly source
of funds because their short-term nature facilitates renewal at increasingly
higher interest rates, which may adversely affect the Bank's earnings. However,
the converse is true in a falling interest-rate market where such short-term
deposits would be more favorable.
 
     Time deposits of $100,000 and over mature as follows at the dates
indicated:
 
<TABLE>
<CAPTION>
                                                           JUNE 30, 1998   DECEMBER 31, 1997
                                                           -------------   -----------------
                                                                (DOLLARS IN THOUSANDS)
<S>                                                        <C>             <C>
Due in three months or less..............................     $ 5,226           $2,687
Due from three months to six months......................       7,608            2,780
Due from six months to one year..........................       7,521            3,866
Due over one year........................................       1,525              505
                                                              -------           ------
          Total time deposits $100,000 and over..........     $21,880           $9,838
                                                              =======           ======
</TABLE>
 
IMPACT OF INFLATION AND CHANGING PRICES
 
     The financial statements and related data concerning InterWest have been
prepared in accordance with generally accepted accounting principles which
require the measurement of financial position and operating results in terms of
historical dollars without considering changes in the relative purchasing power
of money over time due to inflation. The principal element of InterWest's
earnings is interest income which may be significantly affected by the level of
inflation and by government monetary and fiscal policies adopted in response to
inflationary or deflationary pressures.
 
     Inflation affects the reported financial condition and results of
operations of all companies. However, the majority of assets and liabilities of
financial institutions are monetary in nature and therefore differ greatly from
most commercial and industrial companies that have significant investments in
fixed assets or inventories. Inflation does have an important impact on the
growth of total assets and the resulting need to increase equity capital at
higher than normal rates in order to maintain an appropriate equity to assets
ratio. Inflation also is a factor which may influence interest rates, yet the
frequency and magnitude of interest rate fluctuations do not necessarily
coincide with changes in the general inflation rate. In an effort to cope with
the effects of inflation, InterWest attempts to monitor its interest-rate
sensitivity gap position, as discussed above. In addition, a periodic review of
banking services and products is conducted to adjust pricing in view of current
costs.
 
                                       71
<PAGE>   80
 
                             BUSINESS OF BANCGROUP
 
GENERAL
 
     BancGroup is a bank holding company registered under the BHCA. It was
organized in 1974 under the laws of Delaware and has operated under its current
name and management since 1981. BancGroup operates Colonial Bank as its wholly
owned commercial banking subsidiary in the states of Alabama, Georgia, Florida
and Tennessee. Colonial Bank, an Alabama banking corporation, conducts a full
service banking business through 134 branches in Alabama, five branches in
Tennessee, 14 branches in Georgia, three branches in Nevada and 79 branches in
Florida. Colonial Mortgage Company, a subsidiary of Colonial Bank in Alabama, is
a mortgage banking company which services approximately $14.7 billion in
residential loans and which originates mortgages in 34 states through four
divisional offices. At June 30, 1998, BancGroup had consolidated total assets of
$8.8 billion and consolidated stockholders' equity of $601.8 million.
BancGroup's commercial banking loan portfolio is comprised primarily of
commercial real estate loans (28%) and residential real estate loans (42%), a
significant portion of which is located within the State of Alabama. BancGroup's
growth in loans over the past several years has been concentrated in commercial
and residential real estate loans.
 
RECENTLY COMPLETED AND OTHER PROPOSED BUSINESS COMBINATIONS
 
     Since June 30, 1998, BancGroup has acquired one banking institution, CNB
Holding Company, with aggregate assets and stockholders' equity acquired of
$89.8 million and $8.5 million, respectively.
 
     On May 5, 1998, BancGroup entered into a definitive agreement with
FirstBank ("FirstBank"). FirstBank is located in Dallas, Texas. CBG Acquisition
Corp., a subsidiary of BancGroup, will be merged into FirstBank, and FirstBank
will become a banking subsidiary of BancGroup. Giving effect to the Stock Split,
BancGroup expects to issue approximately 2,400,000 shares of its Common Stock to
the shareholders of FirstBank. This transaction is subject to, among other
things, approval by the shareholders of FirstBank and by the appropriate
regulatory authorities and is expected to be accounted for as a pooling of
interests. At June 30, 1998, 1998, FirstBank had assets of $172.9 million,
deposits of $149.5 million and stockholders' equity of $9.4 million.
 
     On May 14, 1998, BancGroup entered into a definitive agreement with First
Macon Bank & Trust Company ("First Macon"). First Macon is located in Macon,
Georgia. First Macon will merge with BancGroup's existing subsidiary bank,
Colonial Bank. Giving effect to the Stock Split, BancGroup expects to issue a
maximum of 3,689,000 shares of its Common Stock to the shareholders of First
Macon. This transaction is subject to, among other things, approval by the
shareholders of First Macon and by the appropriate regulatory authorities and is
expected to be accounted for as a pooling of interests. At June 30, 1998, First
Macon had assets of $199.1 million, deposits of $175.5 million and stockholders'
equity of $15.8 million.
 
     On May 21, 1998, BancGroup entered into a definitive agreement with Prime
Bank of Central Florida ("Prime Bank"). Prime Bank is located in Titusville,
Florida. Prime Bank will merge with Colonial Bank. Giving effect to the Stock
Split, BancGroup expects to issue a maximum of 1,173,120 shares of BancGroup
Common Stock to the shareholders of Prime Bank. This transaction is subject to,
among other things, approval by the shareholders of Prime Bank and by the
appropriate regulatory authorities and is expected to be accounted for as a
pooling of interests. At June 30, 1998, Prime Bank had assets of $71.6 million,
deposits of $64.4 million and stockholders' equity of $6.8 million.
 
     On August 6, 1998, BancGroup entered into a definitive agreement with TB&T,
Inc. ("TB&T") to merge TB&T with and into BancGroup. TB&T is located in Dallas,
Texas. In connection with this transaction, giving effect to the Stock Split,
BancGroup expects to issue approximately 2,369,002 shares of BancGroup Common
Stock to the shareholders of TB&T. This transaction is subject to, among other
things, approval by the shareholders of TB&T and by the appropriate regulatory
authorities, and is expected to be accounted for as a pooling of interest. At
April 30, 1998, TB&T had assets of $100 million, deposits of $90.6 million, and
stockholders equity of $8.4 million.
                                       72
<PAGE>   81
 
YEAR 2000 COMPLIANCE
 
     Most computer software programs and processing systems, including those
used by BancGroup and its subsidiaries in their operations, have not been
designed to accommodate entries beyond the year 1999 in date fields. Failure to
address the anticipated consequences of this design deficiency could have
material adverse effects on the business and operations of any business,
including BancGroup, that relies on computers and associated technologies. In
response to the challenges of addressing such consequences in the banking
industry, bank regulatory agencies, including the Federal Reserve, BancGroup's
primary regulator, have established a Year 2000 Supervision Program and
published guidelines for implementing procedures to bring the computer software
programs and processing systems into year 2000 compliance.
 
     In compliance with the guidelines of the Federal Reserve, BancGroup has
established a full time Year 2000 task force to address all Year 2000 compliance
issues as well as enhancements to computer and communications systems resulting
from upgrades initiated in response to Year 2000 issues. Currently BancGroup is
in the process of implementing its plans to bring all major computer systems
into Year 2000 compliant status by December 31, 1998, allowing the full year
1999 for testing of any systems changes. The major computer systems involved
are:
 
          - Colonial Bank's mainframe based systems:  These systems are provided
            by third party vendors of national stature. Upgrades to these
            systems are in progress which will bring the systems into Year 2000
            compliant status and provide enhancements to current capabilities.
            The costs associated with these upgrades are part of BancGroup's
            ongoing operating costs.
 
          - Colonial Mortgage Company's (CMC) servicing and production
            systems:  CMC's systems are primarily in-house systems and are
            currently being rewritten to Year 2000 compliant status. The cost of
            the rewrites is estimated to be $1.0 million and is incremental to
            the Company's ongoing operating costs. In addition, CMC's computer
            hardware is being upgraded to Year 2000 compliant status. This
            upgrade will also provide additional capacity for the servicing
            systems as well as an enhanced capability for the servicing systems
            and an enhanced capability for production. The additional annual
            costs of the mainframe upgrade (approximately $240,000) are expected
            to be absorbed through growth in the servicing portfolio and through
            increased production. CMC expects to maintain an average servicing
            cost per loan below $48.00 in 1998 and future years.
 
          - Branch automation operating systems:  Colonial Bank's branch
            automation operating systems are being converted to Windows NT from
            OS/2. This conversion along with establishment of any intranet and
            increased capacity of communication lines is the most cost effective
            method of bringing the operating system to Year 2000 compliant
            status while allowing for more efficient flow of information to and
            from the branches and provided the highest assurance of continuing
            vendor support for the Company's branch automation solution. The
            incremental operating cost for these upgrades (approximately
            $400,000 annually) is expected to be absorbed through operational
            efficiencies and increased revenue. The Company will incur a
            one-time pretax charge of approximately $2.0 million to write off
            the remaining book value of the current branch automation equipment
            that is not Windows NT compatible.
 
     BancGroup expects to incur additional third party costs totaling
approximately $300,000 related to assessing the status of the Company's systems
and defining its strategy to bring all systems in to Year 2000 compliance. These
costs have been and will continue to be expensed as incurred and are not
significant to BancGroup's on-going operating costs. The costs to bring other
miscellaneous systems into Year 2000 compliance are not expected to be material.
 
     The above reflects management's current assessment and estimates. Various
factors could cause actual results to differ materially from those contemplated
by such assessments, estimates and forward-looking statements. Some of these
factors may be beyond the control of BancGroup, including but not limited to,
vendor representation, technological advancements, economic factors and
competitive considerations.
 
                                       73
<PAGE>   82
 
     Management's evaluation of Year 2000 compliance and technological upgrades
is an on-going process involving continual evaluation. Unanticipated problems
could develop and alternative solutions may be available that could cause
current solutions to be more difficult or costly than currently anticipated.
 
VOTING SECURITIES AND PRINCIPAL STOCKHOLDERS
 
     As of June 30, 1998, BancGroup had issued and outstanding 98,232,266 shares
of BancGroup Common Stock with 8,910 stockholders of record. Each such share is
entitled to one vote. In addition, as of that date, 3,858,122 shares of
BancGroup Common Stock were subject to issue upon exercise of options pursuant
to BancGroup's stock option plans and up to 549,382 shares of BancGroup Common
Stock were issuable upon conversion of BancGroup's 1986 Debentures. There are
currently 200,000,000 shares of BancGroup Common Stock authorized.
 
     The following table shows those persons who are known to BancGroup to be
beneficial owners as of February 27, 1998 of more than five percent of
outstanding BancGroup Common Stock.
 
<TABLE>
<CAPTION>
                                                                            PERCENTAGE
                                                               COMMON        OF CLASS
                      NAME AND ADDRESS                          STOCK     OUTSTANDING(1)
                      ----------------                        ---------   --------------
<S>                                                           <C>         <C>
Robert E. Lowder(2).........................................  5,813,590(3)      5.87%
  Post Office Box 1108
  Montgomery, AL 36101
</TABLE>
 
- ---------------
 
(1) Percentages are calculated for each person assuming the issuance of shares
    of BancGroup Common Stock pursuant to BancGroup's stock option plans, if
    any, that are held by such person.
(2) Robert E. Lowder is the brother of James K. and Thomas H. Lowder. Robert E.
    Lowder disclaims any beneficial ownership interest in the shares owned by
    his brothers.
(3) Includes 382,040 shares of BancGroup Common Stock subject to options under
    BancGroup's stock option plans.
 
                                       74
<PAGE>   83
 
SECURITY OWNERSHIP OF MANAGEMENT
 
     The following table indicates for each director, executive officer, and all
executive officers and directors of BancGroup as a group the number of shares of
outstanding Common Stock of BancGroup beneficially owned as of June 30, 1998.
 
                     SHARES OF BANCGROUP BENEFICIALLY OWNED
 
<TABLE>
<CAPTION>
                                                                                PERCENTAGE
                                                                                 OF CLASS
                       DIRECTORS NAME                         COMMON STOCK      OUTSTANDING
                       --------------                         ------------      -----------
<S>                                                           <C>               <C>
Lewis Beville...............................................       3,632               *
Young J. Boozer.............................................      33,786(1)            *
William Britton.............................................      31,232               *
Jerry J. Chesser............................................     299,272               *
Augustus K. Clements, III...................................      39,542               *
Robert S. Craft.............................................      35,442               *
Patrick F. Dye..............................................      61,920(2)            *
James L. Hewitt.............................................     901,384(3)            *
Clinton O. Holdbrooks.......................................     552,800(4)            *
D. B. Jones.................................................      45,178(5)            *
Harold D. King..............................................     297,162               *
Robert E. Lowder............................................   5,813,590(6)         5.87%
John Ed Mathison............................................      59,762               *
Milton E. McGregor..........................................           0               *
John C.H. Miller, Jr........................................      76,704(7)            *
Joe D. Mussafer.............................................      42,058               *
William E. Powell, III......................................      28,706               *
J. Donald Prewitt...........................................     439,142(8)            *
Jack H. Rainer..............................................       5,380               *
Jimmy Rane..................................................       2,700(9)            *
Frances E. Roper............................................     735,030               *
Simuel Sippial..............................................       8,868               *
Ed V. Welch.................................................      62,722               *
CERTAIN EXECUTIVE OFFICERS WHO ARE NOT ALSO DIRECTORS
Young J. Boozer, III........................................     143,330(1)(10)        *
Michelle Condon.............................................      38,196(10)           *
P.L. ("Mac") McLeod, Jr.....................................     125,052(10)           *
W. Flake Oakley, IV.........................................      84,714(10)           *
All Executive Officers & Directors as a Group...............   9,967,304           10.06%
</TABLE>
 
- ---------------
 
   * Represents less than 1%.
 (1) Includes 2,000 shares of Common Stock out of 4,000 shares owned by Young J.
     Boozer, and Young J. Boozer, III EX U/W Phyllis C. Boozer. Mr. Boozer
     resigned as of July 15, 1998 and currently serves as a Director Emeritus.
 (2) Includes 50,000 shares of Common Stock subject to options exercisable under
     BancGroup's stock option plans.
 (3) Includes 105,364 shares of Common Stock subject to stock options.
 (4) Includes 128,996 shares held by Mr. Holdbrooks as trustee.
 (5) Mr. Jones holds power to vote 41,466 of these shares as trustee.
 (6) Includes 382,040 shares of Common Stock subject to options under
     BancGroup's stock option plans.
 (7) Includes 40,000 shares of Common Stock subject to options under BancGroup's
     stock option plans.
 (8) Includes 127,208 shares of Common Stock subject to stock options.
 
                                       75
<PAGE>   84
 
 (9) Mr. Rane's Keogh Plan owns 1,000 shares of BancGroup Common Stock.
(10) Young J. Boozer, III, Michelle M. Condon, P.L. ("Mac") McLeod, Jr. and W.
     Flake Oakley hold options respecting 50,000, 18,490, 56,000 and 36,000
     shares of Common Stock, respectively, pursuant to BancGroup's stock option
     plans, not counting options that are not exercisable within 60 days due to
     vesting requirements.
 
MANAGEMENT INFORMATION
 
     Certain information regarding the biographies of the directors and
executive officers of BancGroup, executive compensation and related party
transactions is included in (i) BancGroup's Annual Report on Form 10-K for the
fiscal year ending December 31, 1997, at item 10 and (ii) BancGroup's Proxy
Statement for its 1998 Annual Meeting, at items 10, 11 and 13.
 
                                       76
<PAGE>   85
 
                             BUSINESS OF INTERWEST
 
GENERAL
 
     InterWest is a bank holding company within the meaning of the BHCA and was
incorporated on March 1, 1991. InterWest owns 86.07% of the outstanding shares
of the Bank and 100% of the outstanding shares of the Mortgage Company. The Bank
operates four branches, one in each of Sparks and Fallon, and two in Reno,
Nevada. The Bank operates under the regulations of the State of Nevada and is a
member of the Federal Reserve Bank and a member of the Federal Homes Loan Bank.
InterWest Mortgage operates full service mortgage loan origination offices in
Portland, Oregon, Idaho Falls, Idaho, and in Las Vegas, Carson City and Reno,
Nevada.
 
     The Bank provides a range of consumer and commercial banking services to
individuals, businesses and industries. The basic services offered by the Bank
include; demand interest bearing and non-interest bearing accounts, money market
deposit accounts, NOW accounts, time deposits, safe deposit services, direct
deposits, notary services, money orders, night depository, travelers' checks,
cashiers' checks, domestic collections, savings bonds, bank drafts, and drive-in
tellers. In addition, the Bank makes secured and unsecured commercial, real
estate, real estate construction, and consumer loans and issues standby letters
of credit. The Bank operates three automated teller machines ("ATM's") and
provides ATM cards, as a part of the CIRRUS ATM network, thereby permitting
customers to utilize the convenience of larger ATM networks. The Bank does not
have trust powers and, accordingly, provides no trust services.
 
     The revenues of the Bank are primarily derived from interest on, and fees
received in connection with, real estate and other loans, and from interest from
short-term investments. The principal sources of funds for the Bank's lending
activities are its deposits, repayments of loans. The principal expenses of the
Bank are the interest paid on deposits, and operating and general administrative
expenses.
 
     The revenues of the Mortgage Company are primarily derived from origination
fees charged on mortgage loan originations, service released premiums on those
mortgages sold in the secondary market, and loan servicing fees on the loans
serviced for investors. The Mortgage Company also has a warehouse line of credit
at U.S. Bank in the amount of $9 million for the purpose of funding mortgage
loan originations.
 
     As is the case with banking institutions generally, the Bank and Mortgage
Company operations are materially and significantly influenced by general
economic conditions and by related monetary and fiscal policies of financial
institution regulatory agencies, including the Federal Reserve and the FDIC.
Deposit flows and costs of funds are influenced by interest rates on competing
investments and general market conditions. Lending activities are affected by
the demand for financing of real estate and other types of loans, which in turn
are affected by the interest rates at which such financing may be offered and
other factors affecting local demand and availability of funds. The Bank faces
strong competition in the attraction of deposits (its primary source of lendable
funds) and in the origination of loans.
 
DEPOSIT ACTIVITIES
 
     Deposits are the major source of the Bank's funds for lending and other
investment activities. The Bank considers the majority of its regular savings,
demand, NOW and money market deposit accounts to be core deposits. These
accounts comprised 57.6% of the Bank's total deposits at June 30, 1998. At June
30, 1998, 42.4% of the Bank's deposits were certificates of deposit. Generally,
the Bank attempts to maintain the rates paid on its deposits at a competitive
level. Time deposits of $100,000 and over made up 18.8% of the Bank's total
deposits at June 30, 1998. The majority of the deposits of the Bank are
generated in the Washoe and Churchill Counties of Nevada. For additional
information on the Bank's deposits activities, see "InterWest
Bancorp -- Management's Discussion and Analysis of Financial Condition and
Results of Operations -- Financial Condition -- Deposit Activities".
 
                                       77
<PAGE>   86
 
LENDING ACTIVITIES
 
     The Bank offers a range of lending services, including real estate,
consumer and commercial loans, to individuals and small business and other
organizations that are located in, or conduct a substantial portion of their
business in, the Bank's market area, which is considered to be all areas where
the Bank or the Mortgage Company has an office. The Bank's loans receivable, net
at June 30, 1998 were $89.2 million, or 72.28% of total assets. The interest
rates charged on loans vary with the degree of risk, maturity, and amount of the
loan, and are further subject to competitive pressures, deposit rates,
availability of funds, and government regulations. The Bank has no foreign
loans.
 
     The Mortgage Company originates FHA/VA and Conventional one- to four-family
real estate loans. These loans are all sold in the secondary market or brokered
to institutional investors, and the Mortgage Company hedges its loans and
commitments to avoid losses due to the interest rate and terms that have been
agreed to with individual borrowers. The Mortgage Company also originates single
family construction loans. These loans are approved and funded by the Bank. The
Mortgage Company services $83.9 million of first mortgage loans for secondary
market investors as of June 30, 1998.
 
     The Bank's loans are concentrated in three major areas: real estate loans,
commercial loans, and consumer loans. As of June 30, 1998, 79.0% of the Bank's
loan portfolio consisted of loans secured by mortgages on real estate and 16.5%
of the loan portfolio consisted of commercial loans. At the same date, 4.5% of
the Bank's loan portfolio consisted of consumer loans and other loans.
 
     The Bank's real estate loans are secured by mortgages and consist primarily
of loans to individuals and businesses for the purchase, improvement of or
investment in real estate and for the construction of single family residential
units or the development of single-family residential building lots. These real
estate loans may be made at fixed- or variable-interest rates. The Bank
generally does not make fixed-interest rate commercial real estate loans with
maturities exceeding five years. The Bank purchases residential real estate
loans from the Mortgage Company on a short term basis. These loans have all been
sold in the secondary market.
 
     The Bank's commercial loans include loans to individuals and
small-to-medium sized businesses located primarily in Washoe and Churchill
Counties for working capital, equipment purchases, and various other business
purposes. A majority of the Bank's commercial loans are secured by business
assets, but these loans may also be made on an unsecured basis. Commercial loans
may be made at variable- or fixed-interest rates. Commercial lines of credit are
typically granted on a one-year basis, with loan covenants and monetary
thresholds. Other commercial loans with terms or amortization schedules of
longer than one year will normally carry interest rates which vary with the
prime lending rate and with maturities of three to five years.
 
     The Bank's consumer loan portfolio consists primarily of loans to
individuals for various consumer purposes, which are payable on an installment
basis. The majority of these loans are for terms of five years or less and are
secured by liens on various personal assets of the borrowers, but consumer loans
may also be made on an unsecured basis. Consumer loans are generally made at
fixed-rates.
 
     For additional information on the Bank's lending activities, see "InterWest
Bancorp -- Management's Discussion and Analysis of Financial Condition and
Results of Operations -- Financial Condition -- Lending Activities", and "Asset
Quality".
 
INVESTMENTS
 
     The Bank has not historically purchased securities, but has kept its
liquidity in Federal Funds and owns some Federal Home Loan Bank stock. The
Bank's liquidity is managed in relation to loan demand and deposit growth. The
Mortgage Company maintained a security portfolio through 1995, which was
comprised of marketable equity securities traded on a regular basis. Subsequent
to 1995, the Mortgage Company no longer maintains a security portfolio.
 
                                       78
<PAGE>   87
 
EMPLOYEES
 
     As of June 30, 1998, the Bank employed 44 full-time employees and nine
part-time employees. The Mortgage Company has 101 full-time employees and four
part-time employees. The employees are not represented by a collective
bargaining unit. InterWest considers relations with employees to be good.
 
PROPERTIES
 
     The main office of the Bank is located at 2330 South Virginia Street, Reno,
Nevada 89502, in a three story building of approximately 24,000 square feet,
which is owned by the Bank.
 
     The Bank also has banking offices as follows: the Fallon Office is located
at 200 South Maine Street, Fallon, Nevada 89406, the Sparks Office is located at
690 East Prater Way, Sparks, Nevada 89431. These two buildings are also owned by
the Bank. The McCarran Landing Branch is located at 4999 Longley Lane, Reno,
Nevada 89502, which is a leased facility.
 
     The Mortgage Company leases space from the Bank at its 2330 South Virginia
Street, Reno, Nevada facility. The other Reno Mortgage Branch is located at 6880
South McCarran Blvd. #A11, Reno, Nevada 89509. The Mortgage Company has a
satellite office located at 116 East 7th Street, Carson City, Nevada 89701. The
Idaho Falls Branch is located at 1275 East 17th Street, Idaho Falls, Idaho
83404. The Portland Branch is located at 10121 S.E. Sunnyside, Suite 215,
Clackamas, Oregon 97015, and has a satellite office at 3000 Market Street Plaza
N.E., Suite #101, Salem, Oregon 97301. The Las Vegas Branch is located at 770
East Warm Springs Road, Suite 160, Las Vegas, Nevada 89119. The Mortgage Company
leases all of its facilities.
 
YEAR 2000 ISSUES
 
     In the next two years, many companies, including financial institutions
such as InterWest, will face potentially serious issues associated with the
inability of existing data processing hardware and software to appropriately
recognize calendar dates beginning in the year 2000. Many computer programs that
can only distinguish the final two digits of the year entered may read entries
for the year 2000 as the year 1900 and compute payment, interest or delinquency
based on the wrong date, or are expected to be unable to compute payment,
interest or delinquency. In 1997, InterWest began the process of identifying the
many software applications and hardware devices expected to be impacted by this
issue. InterWest has also formulated and begun implementation of a plan to
address issues related its "Mission Critical" computer hardware, software, and
applications which complies with Federal Financial Institutions Examination
Council Year 2000 compliance guidelines as promulgated by InterWest's principal
regulatory agency. The Bank purchases most of its software applications from
third party vendors. The Bank believes that its vendors and its significant
customers are actively addressing the problems associated with the "Year 2000"
issue. The Bank, in cooperation with its service providers and vendors, has met
all applicable regulatory deadlines and intends to meet the remaining regulatory
deadlines promulgated by the Bank's principal regulatory agency. However, there
can be no assurance that InterWest Bank will not be adversely affected by the
failure of such third party vendors or significant customers of the Bank to
become Year 2000 compliant.
 
     The Mortgage Company also began the process of identifying software and
hardware issues in 1997 along with the Bank and followed the same guidelines.
The Mortgage Company purchases most of its software applications from third
party vendors. The Mortgage Company believes that its vendors and information
suppliers, as well as the agencies and investors that purchase its loans, are
addressing the problems associated with the Year 2000 issue on a timely basis.
The Mortgage Company has also implemented its plan to address issues related to
mission critical items and will begin testing prior to September 1, 1998. The
Mortgage Company intends to meet the remaining regulatory deadlines; however,
full preparedness for Year 2000 will rely somewhat upon the success of its third
party vendors and services.
 
                                       79
<PAGE>   88
 
LEGAL PROCEEDINGS
 
     The Bank is periodically a party to or otherwise involved in legal
proceedings arising in the normal course of business, such as claims to enforce
liens, claims involving the making and servicing of real property loans, and
other issues incident to its business. Management does not believe that there is
any pending or threatened proceeding against InterWest, the Bank, or the
Mortgage Company which, if determined adversely, would have a material adverse
effect on InterWest's consolidated financial position.
 
PRINCIPAL HOLDERS OF COMMON STOCK
 
     The following table sets forth information as of the Record Date, regarding
the ownership of InterWest Common Stock by each director of InterWest, and by
all directors and executive officers as a group. Unless otherwise indicated, all
persons shown in the table have sole voting and investment power with regard to
the shares shown.
 
<TABLE>
<CAPTION>
                                                                      SHARES            PERCENTAGE
                            NAME                              BENEFICIALLY OWNED (1)   OF OWNERSHIP
                            ----                              ----------------------   ------------
<S>                                                           <C>                      <C>
Richard L. Martucci, Sr.(2).................................        1,163,278             37.67
Carol T. Martucci(2)........................................        1,163,278             37.67
Richard L. Martucci, Jr.....................................           91,456              2.76
John N. Donovan.............................................          326,536             10.57
Thomas Springer.............................................          247,472              8.01
Marlene Rimington...........................................           34,116              1.10
Alan L. Horner..............................................           27,744               .90
All Executive Officers and Directors as a Group.............        3,053,880             98.89
</TABLE>
 
- ---------------
 
(1) Information related to beneficial ownership is based upon information
    available to InterWest and uses "beneficial ownership" concepts set forth in
    rules of the Commission under the Securities Exchange Act of 1934, as
    amended. Under such rules, more than one person may be deemed to be a
    beneficial owner of the same securities, and a person may be deemed to be a
    beneficial owner of the same securities, and a person may be deemed to be a
    beneficial owner of securities as to which he may disclaim any beneficial
    interest. Accordingly, directors are named as beneficial owners of shares as
    to which they may disclaim any beneficial interest. Except as otherwise
    indicated in the notes to this table, the individuals possessed sole voting
    and investment power as to all shares of InterWest Common Stock set forth
    opposite their names.
(2) Shares of Richard L. Martucci, Sr. and Carol T. Martucci are owned jointly.
 
                        ADJOURNMENT OF SPECIAL MEETINGS
 
     Approval of the Agreement by InterWest shareholders requires the
affirmative vote of at least a majority of the outstanding shares of InterWest
Common Stock. In the event there are an insufficient number of shares of
InterWest Common Stock present in person or by proxy at the Special Meeting to
approve the Agreement, InterWest's Board of Directors intends to adjourn the
Special Meeting to a later date provided a majority of the shares present and
voting on the motion have voted in favor of such adjournment. The place and date
to which the Special Meeting would be adjourned would be announced at the
Special Meeting. Proxies voted against the Agreement and abstentions will not be
voted to adjourn the Special Meeting. Abstentions and broker non-votes will not
be voted on this matter but will not count as "no votes." If it is necessary to
adjourn the Special Meeting and the adjournment is for a period of not more than
30 days from the original date of this Special Meeting, no notice of the time
and place of the adjourned meeting need be given the shareholders, other than an
announcement made at the Special Meeting.
 
     The affect of any such adjournment would be to permit InterWest to solicit
additional proxies for approval of the Agreement. While such an adjournment
would not invalidate any proxies previously filed as long as the record date for
the adjourned meeting remained the same, including proxies filed by shareholders
 
                                       80
<PAGE>   89
 
voting against the Agreement, an adjournment would afford InterWest the
opportunity to solicit additional proxies in favor of the Agreement.
 
                                 OTHER MATTERS
 
     The board of directors of InterWest is not aware of any business to come
before the Special Meeting other than those matters described above in this
Prospectus. If, however, any other matters not now known should properly come
before the Special Meeting, the proxy holders named in the accompany proxy will
vote such proxy on such matters as determined by a majority of the Board of
Directors of InterWest.
 
             DATE FOR SUBMISSION OF BANCGROUP STOCKHOLDER PROPOSALS
 
     In order to be eligible for inclusion in BancGroup's proxy solicitation
materials for its 1999 annual meeting of stockholders, any stockholder proposal
to take action at such meeting must be received at BancGroup's main office at
One Commerce Street Post Office Box 1108, Montgomery, Alabama 36101, no later
than 120 calendar days in advance of the date of March 21, 1999.
 
                                 LEGAL MATTERS
 
     Certain legal matter regarding the shares of BancGroup Common Stock of
BancGroup offered hereby are being passed upon by the law firm of Miller,
Hamilton, Snider & Odom, L.L.C., Mobile, Alabama, of which John C. H. Miller,
Jr., a director of BancGroup, is a partner. Such firm received fees for legal
services performed in 1997 of $1,659,399. John C. H. Miller, Jr., as of June 30,
1998, beneficially owned 76,704 shares of Common Stock. Mr. Miller also received
employee-related compensation from BancGroup in 1997 of $43,485. Certain legal
matters relating to the Merger are being passed upon for InterWest by the law
firm of Lyle & Murphy, L.L.P.
 
                                    EXPERTS
 
     PricewaterhouseCoopers LLP serves as the independent accountants for
BancGroup. The consolidated financial statements of BancGroup as of December 31,
1997 and 1996 and for each of the three years ended December 31, 1997 are
incorporated by reference in this Prospectus in reliance upon the report of such
firm, given on the authority of that firm as experts in accounting and auditing.
It is not expected that a representative of such firm will be present at the
Special Meeting.
 
     Kafoury, Armstrong & Co. serves as the independent accountants for
InterWest. InterWest's consolidated financial statements as of December 31, 1997
and 1996 and for each of the three years ended December 31, 1997 are included in
this Prospectus in reliance upon the report of such firm, given on the authority
of that firm as experts in accounting and auditing. It is not expected that a
representative of such firm will be present at the Special Meeting.
 
                                       81
<PAGE>   90
 
                       INTERWEST BANCORP AND SUBSIDIARIES
 
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
AUDITED FINANCIAL STATEMENTS
INDEPENDENT AUDITOR'S REPORT................................   F-2
  Consolidated Statements of Financial Condition............   F-3
  Consolidated Statements of Income.........................   F-4
  Consolidated Statements of Changes in Stockholders'
     Equity.................................................   F-5
  Consolidated Statements of Cash Flows.....................   F-6
  Notes to Consolidated Financial Statements................   F-7
UNAUDITED CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
  Consolidated Condensed Balance Sheets, June 30, 1998 and
     1997...................................................  F-19
  Consolidated Condensed Statements of Income for the Six
     Months Ended June 30, 1998 and 1997....................  F-20
  Consolidated Condensed Statements of Cash Flows for the
     Six Months Ended June 30, 1998 and 1997................  F-21
  Notes to Unaudited Consolidated Condensed Financial
     Statements for the Six Months Ended June 30, 1998 and
     1997...................................................  F-22
</TABLE>
 
                                       F-1
<PAGE>   91
 
                                  [LETTERHEAD]
 
                          INDEPENDENT AUDITOR'S REPORT
 
To the Board of Directors of
  InterWest Bancorp and Subsidiaries
 
     We have audited the accompanying consolidated statements of financial
condition of InterWest Bancorp and Subsidiaries as of December 31, 1997 and
1996, and the related consolidated statements of income, changes in
stockholders' equity, and cash flows for each of the three years in the period
ended December 31, 1997. These financial statements are the responsibility of
the Bancorp's management. Our responsibility is to express an opinion on these
financial statements based on our audits.
 
     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
     In our opinion, the consolidated financial statements referred to above
present fairly, in all material respects, the financial position of InterWest
Bancorp and Subsidiaries as of December 31, 1997 and 1996, and the results of
its operations and cash flows for each of the three years in the period ended
December 31, 1997, in conformity with generally accepted accounting principles.
 
                                          /s/  Kafoury, Armstrong & Co.
 
Carson City, Nevada
July 21, 1998
 
                                       F-2
<PAGE>   92
 
                       INTERWEST BANCORP AND SUBSIDIARIES
 
                 CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION
                           DECEMBER 31, 1997 AND 1996
 
<TABLE>
<CAPTION>
                                                                 1997          1996
                                                              -----------   -----------
<S>                                                           <C>           <C>
                                        ASSETS
Cash and due from banks.....................................  $ 6,572,762   $ 4,085,786
Federal funds sold..........................................    8,149,000     7,227,000
Loans held for sale -- Note 4...............................   13,341,023     9,958,989
Loans, net of allowance for credit losses of $822,957 and
  $583,624 for 1997 and 1996, respectively -- Notes 4 and
  5.........................................................   64,526,115    47,243,487
Premises and equipment, net -- Note 6.......................    4,760,297     4,701,586
Deferred tax asset -- Note 7................................      144,241       101,909
Other assets -- Note 8......................................    1,665,731     1,466,848
                                                              -----------   -----------
          Total Assets......................................  $99,159,169   $74,785,605
                                                              ===========   ===========
                         LIABILITIES AND STOCKHOLDERS' EQUITY
Deposits:
  Demand deposits...........................................  $17,795,242   $ 8,739,063
  Savings, NOW and money market accounts....................   37,942,143    29,926,154
  Time deposits, $100,000 and over..........................    9,837,512     7,687,231
  Other time deposits.......................................   23,739,483    16,195,647
                                                              -----------   -----------
          Total Deposits....................................   89,314,380    62,548,095
                                                              -----------   -----------
Accrued expenses and other liabilities......................      660,953       514,772
Long-term debt..............................................       28,964            --
Warehouse notes payable -- Note 9...........................    1,129,070     4,310,280
                                                              -----------   -----------
          Total Liabilities.................................   91,133,367    67,373,147
                                                              -----------   -----------
Minority interest...........................................      871,356       779,108
                                                              -----------   -----------
Stockholders' equity:
  Common stock -- no par value, authorized 3,500,000 shares,
     issued and outstanding 3,020,021 shares and 2,992,256
     shares at December 31, 1997 and 1996, respectively.....    1,414,328     1,352,812
  Retained earnings.........................................    5,740,118     5,280,538
                                                              -----------   -----------
          Total Stockholders' Equity........................    7,154,446     6,633,350
                                                              -----------   -----------
          Total Liabilities, Minority Interest, and
            Stockholders' Equity............................  $99,159,169   $74,785,605
                                                              ===========   ===========
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                       F-3
<PAGE>   93
 
                       INTERWEST BANCORP AND SUBSIDIARIES
 
                       CONSOLIDATED STATEMENTS OF INCOME
             FOR THE YEARS ENDED DECEMBER 31, 1997, 1996, AND 1995
 
<TABLE>
<CAPTION>
                                                             1997          1996          1995
                                                          -----------   -----------   -----------
<S>                                                       <C>           <C>           <C>
INTEREST INCOME
  Interest and fees on loans............................  $13,865,280   $11,266,182   $11,408,500
  Interest on federal funds sold........................      254,934       366,959       435,791
  Interest on deposits with banks.......................       13,789        14,345         5,823
                                                          -----------   -----------   -----------
          Total Interest Income.........................   14,134,003    11,647,486    11,850,114
                                                          -----------   -----------   -----------
INTEREST EXPENSE
  Interest on deposits..................................    2,801,357     1,989,680     1,679,388
  Interest on long-term debt............................           --        61,468       114,298
  Interest on warehouse notes payable...................      118,352       498,713       512,560
                                                          -----------   -----------   -----------
          Total Interest Expense........................    2,919,709     2,549,861     2,306,246
                                                          -----------   -----------   -----------
          Net Interest Income...........................   11,214,294     9,097,625     9,543,868
Provision for credit losses -- Note 5...................     (270,000)      (60,000)      (70,000)
                                                          -----------   -----------   -----------
          Net Interest Income After Provision for Credit
            Losses......................................   10,944,294     9,037,625     9,473,868
                                                          -----------   -----------   -----------
OTHER INCOME
  Service charges on deposits...........................      213,558       187,323       178,128
  Unrealized gain (loss) on trading securities..........           --       477,754      (130,919)
  Realized gain (loss) on trading securities............           --      (281,542)        1,766
  Other income..........................................       73,405        53,271       117,123
                                                          -----------   -----------   -----------
                                                              286,963       436,806       166,098
                                                          -----------   -----------   -----------
OTHER EXPENSES
  Salaries and employee benefits........................    6,496,058     4,974,121     4,642,858
  Occupancy expense.....................................      693,602       578,859       603,122
  Equipment expense.....................................      350,996       239,090       218,580
  Loan origination expense..............................      927,777       756,618       898,157
  Office supplies and postage...........................      403,580       355,578       335,650
  Other expense.........................................    1,182,010       917,283     1,074,570
                                                          -----------   -----------   -----------
                                                           10,054,023     7,821,549     7,772,937
                                                          -----------   -----------   -----------
          Income Before Income Taxes....................    1,177,234     1,652,882     1,867,029
                                                          -----------   -----------   -----------
Provision for income tax expense:
  Current...............................................  $   453,709   $   504,016   $   706,129
  Deferred..............................................      (37,610)       51,536        27,320
                                                          -----------   -----------   -----------
                                                              416,099       555,552       733,449
                                                          -----------   -----------   -----------
          Net Income Before Minority Interest...........      761,135     1,097,330     1,133,580
Minority interest in income of subsidiary...............      108,254       125,569       153,498
                                                          -----------   -----------   -----------
          Net Income....................................  $   652,881   $   971,761   $   980,082
                                                          ===========   ===========   ===========
Basic earnings per share................................  $      0.22   $      0.33   $      0.34
                                                          ===========   ===========   ===========
Average shares outstanding..............................    3,006,139     2,962,146     2,923,880
                                                          ===========   ===========   ===========
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                       F-4
<PAGE>   94
 
                       INTERWEST BANCORP AND SUBSIDIARIES
 
           CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY
             FOR THE YEARS ENDED DECEMBER 31, 1997, 1996, AND 1995
 
<TABLE>
<CAPTION>
                                                       COMMON STOCK                         TOTAL
                                                  ----------------------    RETAINED    STOCKHOLDERS'
                                                   SHARES       AMOUNT      EARNINGS       EQUITY
                                                  ---------   ----------   ----------   -------------
<S>                                               <C>         <C>          <C>          <C>
BALANCE, December 31, 1994......................  2,923,880   $1,218,752   $3,328,695    $4,547,447
  Net income....................................         --           --      980,082       980,082
                                                  ---------   ----------   ----------    ----------
BALANCE, December 31, 1995......................  2,923,880    1,218,752    4,308,777     5,527,529
  Net income....................................         --           --      971,761       971,761
  Issuance of shares under stock option plans...     68,376      134,060           --       134,060
                                                  ---------   ----------   ----------    ----------
BALANCE, December 31, 1996......................  2,992,256    1,352,812    5,280,538     6,633,350
  Net income....................................         --           --      652,881       652,881
  Dividends paid................................         --           --     (193,301)
  Issuance of shares under stock option plans...     27,765       61,516           --        61,516
                                                  ---------   ----------   ----------    ----------
BALANCE, December 31, 1997......................  3,020,021   $1,414,328   $5,740,118    $7,154,446
                                                  =========   ==========   ==========    ==========
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                       F-5
<PAGE>   95
 
                       INTERWEST BANCORP AND SUBSIDIARIES
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
             FOR THE YEARS ENDED DECEMBER 31, 1997, 1996, AND 1995
 
<TABLE>
<CAPTION>
                                                                  1997           1996          1995
                                                              ------------   ------------   -----------
<S>                                                           <C>            <C>            <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net income................................................  $    652,881   $    971,761   $   980,082
  Adjustments to reconcile net income to net cash provided
    by operating activities:
    Depreciation and amortization...........................       398,098        262,990       218,958
    Minority interest in income of subsidiary...............       108,254        125,569       153,498
    Provision for credit (recoveries) losses................       270,000         60,000        70,000
    Provisions for losses on other real estate owned........        18,353         18,353        26,088
    (Gain) loss on sale of other real estate owned..........       (57,154)         2,941       (49,556)
    (Gain) loss on sale of fixed assets.....................       (27,612)       (13,516)       (1,364)
    (Gain) loss on sale of trading securities...............        (1,079)       281,542        (1,766)
    Proceeds from sale of trading securities................         1,079        833,782       603,914
    Unrealized (gain) loss on trading securities............            --       (477,754)      130,919
    Unrealized (gain) loss on hedged securities.............        (8,281)            --            --
    Unrealized (gain) loss on mortgage servicing rights.....          (213)           213            --
    Unrealized (gain) loss on purchase of subsidiary's
      stock.................................................        (1,876)            --            --
    (Increase) decrease in:
      Loans held for sale...................................    (3,382,034)     3,781,420    (8,478,657)
      Deferred income tax asset.............................      (105,717)        50,754        23,056
      Other assets..........................................      (222,803)      (403,663)      411,165
    Increase (decrease) in:
      Accrued expenses and other liabilities................       146,181        (59,655)      179,500
      Warehouse note payable................................    (3,181,210)    (8,656,398)    8,110,543
                                                              ------------   ------------   -----------
        Net Cash Provided (Used) by Operating Activities....    (5,393,133)    (3,221,661)    2,376,380
                                                              ------------   ------------   -----------
CASH FLOWS FROM INVESTING ACTIVITIES
  Sale of Federal Reserve Bank stock........................            --             --        63,000
  Purchase of Federal Home Loan Bank stock..................      (245,600)       (16,200)      (18,700)
  Purchase of subsidiary's stock............................        (3,624)            --            --
  Net (increase) decrease in loans..........................   (17,552,628)   (10,596,968)   (3,354,837)
  Sale of other real estate owned...........................       798,643        647,109        38,258
  Acquisition of other real estate owned....................      (441,474)    (1,005,626)           --
  Acquisition of premises and equipment, net................      (380,138)    (3,414,299)     (176,856)
  (Increase) decrease in deposits...........................        (7,433)        (9,152)       (3,026)
  Purchase of other investments.............................       (18,594)            --            --
  Proceeds from sale of other investments...................            --        209,906            --
                                                              ------------   ------------   -----------
        Net Cash Provided (Used) by Investing Activities....   (17,850,848)   (14,185,230)   (3,452,161)
                                                              ------------   ------------   -----------
CASH FLOWS FROM FINANCING ACTIVITIES:
  Net increase (decrease) in:
    Demand deposits.........................................  $  9,056,179   $  3,009,753   $   372,453
    Savings and NOW deposits................................     8,015,989     17,477,288    (1,338,937)
    Time deposits -- $100,000 and over......................     2,150,281        704,624     1,703,964
    Other time deposits.....................................     7,543,836     (2,421,264)    2,729,551
  Payments on note payable..................................            --     (1,060,000)     (190,000)
  Payments on long-term debt................................            --         (8,382)     (310,424)
  Payments on short-term debt...............................            --       (297,113)     (316,400)
  Proceeds of long-term debt................................        28,964             --            --
  Dividends paid by subsidiary to minority stockholders.....       (10,507)       (42,025)      (46,225)
  Dividends paid to stockholders............................      (193,301)            --            --
  Sale of stock.............................................        61,516        134,060            --
                                                              ------------   ------------   -----------
        Net Cash Provided (Used) by Financing Activities....    26,652,957     17,496,941     2,603,982
                                                              ------------   ------------   -----------
        Net Increase (Decrease) in Cash and Cash
          Equivalents.......................................     3,408,976         90,050     1,528,201
CASH AND CASH EQUIVALENTS, Beginning........................    11,312,786     11,222,736     9,694,535
                                                              ------------   ------------   -----------
CASH AND CASH EQUIVALENTS, Ending...........................  $ 14,721,762   $ 11,312,786   $11,222,736
                                                              ============   ============   ===========
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
  Cash paid during the year for:
    Interest................................................  $  2,865,595   $  2,544,255   $ 2,300,794
                                                              ============   ============   ===========
    Income taxes............................................  $    420,401   $    487,446   $   699,437
                                                              ============   ============   ===========
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                       F-6
<PAGE>   96
 
                       INTERWEST BANCORP AND SUBSIDIARIES
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                       DECEMBER 31, 1997, 1996, AND 1995
 
NOTE 1 -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
PRINCIPLES OF CONSOLIDATION
 
     On March 1, 1991, InterWest Bancorp (the "Bancorp") acquired InterWest Bank
(the "Bank") in a business combination accounted for as a pooling of interest.
InterWest Bank became an 85.67% subsidiary of the Bancorp through the exchange
of 1,769,840 shares of the Bancorp's common stock for 85.67% of the outstanding
stock of InterWest Bank. Significant intercompany accounts and transactions are
eliminated in the consolidation.
 
     Since March 1, 1991, the Bancorp has acquired more shares of the stock and
now holds 85.9725% of the outstanding shares of the stock of InterWest Bank.
 
     Minority interest, reported in these financial statements, represents the
remaining shares of common stock of InterWest Bank owned by minority
stockholders.
 
     On August 1, 1996, the Bancorp acquired InterWest Mortgage in a business
combination accounted for as a pooling of interest. InterWest Mortgage, which
engages in mortgage banking activities, became a wholly-owned subsidiary of the
company through the exchange of 1,154,040 shares of the company's common stock
for all of the outstanding stock of InterWest Mortgage. The accompanying
financial statements for 1996 are based on the assumption that the companies
were combined for the full year, and financial statements of prior years have
been restated to give effect to the combination. All significant intercompany
transactions have been eliminated in the consolidation. Prior to the
acquisition, InterWest Mortgage had a fiscal year end of February 29 and changed
its year end to conform with the year end of InterWest Bancorp for the year
ended December 31, 1996. Therefore, the accompanying financial statements
include ten months of operations for InterWest Mortgage in the 1996 amounts and
twelve months of operations for InterWest Mortgage for the 1997 and 1995
amounts.
 
BUSINESS OPERATIONS
 
     InterWest Bank is a Nevada State Chartered Bank. The Bank provides a
variety of financial services to individuals and corporate customers through its
branches in Reno, Sparks, and Fallon, Nevada. The Bank's primary deposit
products are non-interest-bearing and interest-bearing checking accounts,
savings, money market, NOW accounts, and certificates of deposit. Its primary
lending products are commercial loans related to the development of single
family homes and commercial properties, and single family residential loans.
Accordingly, its revenues are derived primarily from these products.
 
     InterWest Mortgage is engaged in mortgage banking operations and is a
Nonsupervised Mortgagee under approval of the U.S. Department of Housing and
Urban Development (HUD). The company originates, markets and services
residential real estate mortgage loans to borrowers primarily in the areas where
its offices are located (Nevada, Oregon, and Idaho).
 
USE OF ESTIMATES
 
     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates.
 
     Material estimates that are particularly susceptible to significant change
relate to the determination of the allowance for credit losses on loans and the
valuation of real estate acquired in connection with foreclosures or
 
                                       F-7
<PAGE>   97
                       INTERWEST BANCORP AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
in satisfaction of loans. In connection with the determination of the allowances
for losses on loans and foreclosed real estate, management obtains independent
appraisals for significant properties.
 
     While management uses available information to recognize losses on loans
and foreclosed real estate, future additions to the allowances may be necessary
based on changes in local economic conditions or growth in the loan portfolio.
In addition, regulatory agencies, as an integral part of their examination
process, periodically review the Bank's allowances for losses on loans and
foreclosed real estate. Such agencies may require the Bank to recognize
additions to the allowances based on their judgments about information available
to them at the time of their examination. Because of these factors, it is
reasonably possible that the allowances for losses on loans and foreclosed real
estate may change materially in the near term.
 
STATEMENT OF CASH FLOWS
 
     For purposes of reporting cash flows, cash and cash equivalents include
cash on hand, amounts due from banks and federal funds sold. Generally, federal
funds are purchased and sold for one-day periods.
 
LOANS
 
     Loans are stated at the principal amount outstanding. Interest is accrued
on a simple interest basis. Related loan fees in excess of the estimate of
management of the cost of processing the loan are generally amortized into
income over the applicable loan periods.
 
     Loans are generally placed on nonaccrual status when management determines
full collectibility is uncertain, which is generally when they are past due
ninety days as to either interest or principal. However, loans that are in the
process of renewal in the normal course of business or are adequately secured
and in the process of legal collection may not be placed, at the judgment of
senior credit management, on nonaccrual status. Generally, when a loan is placed
on nonaccrual status, previously accrued interest is charged back against
interest income on loans. A nonaccrual loan may be restored to an accrual basis
when interest and principal payments are current and when the Bank is satisfied
that the loan is fully collectible.
 
     Loans held for sale are carried at the lower of cost or market. Market is
estimated based on quoted market prices for similar loans.
 
ALLOWANCE FOR CREDIT LOSSES
 
     The allowance for credit losses is maintained at a level considered
adequate based on management's overall evaluation of the inherent risks in the
loan portfolio and detailed evaluations of the collectibility of specific loans.
 
PREMISES AND EQUIPMENT
 
     Buildings, leasehold improvements, furniture, fixtures and equipment are
stated at cost less accumulated depreciation and amortization. Provisions for
depreciation and amortization included in operating expenses are computed
according to the straight-line method over the estimated useful lives of the
assets.
 
OTHER REAL ESTATE OWNED
 
     Other real estate owned from foreclosure on property is valued at the lower
of fair market value or the Bank's recorded investment in the related loan.
Valuations are periodically performed by management, and valuation allowances
are established by a charge to allowance for loss on other real estate owned if
the carrying value of a property exceeds its estimated net realizable value.
 
                                       F-8
<PAGE>   98
                       INTERWEST BANCORP AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
LOAN SERVICING
 
     The mortgage company earns fees for servicing first mortgage loans. The
fees are generally based on a percentage of the outstanding principal balances
of the loans serviced and are recorded as income as the loan payments are
collected.
 
     The cost of mortgage servicing rights is amortized in proportion to, and
over the period of, estimated net servicing revenues. Impairment of mortgage
servicing rights is assessed based on the fair value of those rights. Fair
values are estimated using quoted market prices of mortgage backed securities
with similar terms which approximates discounted cash flows based on current
market interest rates. The amount of impairment recognized is the amount by
which the capitalized mortgage servicing rights exceed its fair value.
 
INCOME TAXES
 
     Deferred tax provisions/benefits are calculated for certain transactions
and events because of differing treatments under generally accepted accounting
principles and the currently enacted tax laws of the federal government. The
results of these differences on a cumulative basis, known as temporary
differences, result in the recognition and measurement of deferred tax assets
and liabilities in the accompanying statement of financial condition.
 
     The Bancorp and Subsidiaries file a consolidated income tax return. Each
provides for income tax expense based on its contribution to taxable income of
the consolidated group.
 
NET INCOME PER SHARE OF COMMON STOCK
 
     Net income per share of common stock is computed by dividing net income by
the weighted average number of shares of common stock outstanding during the
period.
 
DIVIDENDS
 
     In accordance with Nevada Revised Statutes, the company's dividend policy
prohibits payments of dividends in excess of its retained earnings.
 
ADVERTISING COSTS
 
     The company expenses all advertising costs when incurred.
 
RECLASSIFICATION
 
     Certain amounts in the 1996 and 1995 financial statements have been
reclassified to conform to the current year's presentation. These
reclassifications have no effect on the net income, stockholders' equity or
total cash flow balances previously reported.
 
NOTE 2 -- LOAN FUNDING AND SERVICING
 
     During 1997, 1996, and 1995, InterWest Mortgage funded, and subsequently
sold, mortgage loans of $242,772,119, $204,985,077, and $209,002,029
respectively.
 
     The mortgage company's loan servicing portfolios at December 31 were as
follows:
 
<TABLE>
<CAPTION>
                                                     1997          1996          1995
                                                  -----------   -----------   -----------
<S>                                               <C>           <C>           <C>
Number of mortgage loans........................        1,037         1,002           961
                                                  ===========   ===========   ===========
Unpaid principal balance of mortgage loans......  $85,915,490   $81,741,259   $80,403,249
                                                  ===========   ===========   ===========
</TABLE>
 
                                       F-9
<PAGE>   99
                       INTERWEST BANCORP AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     Following is a reconciliation of the net mortgage servicing rights included
in other assets on the statements of financial condition at December 31:
 
<TABLE>
<CAPTION>
                                                                1997      1996     1995
                                                              --------   -------   ----
<S>                                                           <C>        <C>       <C>
Beginning balance...........................................  $ 63,952   $    --    $--
Amount capitalized, net.....................................   148,724    71,641     --
Amortization................................................   (37,515)   (7,476)    --
Valuation allowance.........................................        --      (213)    --
                                                              --------   -------    ---
          Net Amount........................................  $175,161   $63,952    $--
                                                              ========   =======    ===
</TABLE>
 
NOTE 3 -- FUNDS HELD IN TRUST
 
     Funds held in trust represent funds collected by the mortgage company from
mortgagors for insurance premiums, real estate taxes and principal and interest
collections that will be forwarded to insurance carriers, taxing authorities or
permanent investors. The funds held in trust which are not included on the
statements of financial condition in these financial statements are $826,559 and
$811,561 as of December 31, 1997 and 1996, respectively.
 
NOTE 4 -- LOANS
 
     Details of loans held for sale as of December 31 were as follows:
 
<TABLE>
<CAPTION>
                                                                 1997          1996
                                                              -----------   ----------
<S>                                                           <C>           <C>
Loans secured by real estate................................  $13,341,023   $9,958,989
                                                              ===========   ==========
</TABLE>
 
     Details of loan balances as of December 31 are summarized below:
 
<TABLE>
<CAPTION>
                                                                 1997          1996
                                                              -----------   -----------
<S>                                                           <C>           <C>
Commercial loans............................................  $11,865,677   $ 5,047,432
Loans secured by real estate................................   51,312,224    41,205,983
Consumer installment loans..................................    2,200,368     1,781,349
Lease financing.............................................      224,945        80,384
All other loans.............................................       86,128        11,851
                                                              -----------   -----------
                                                               65,689,342    48,126,999
Deferred loan fees..........................................     (311,652)     (283,722)
Allowance for credit losses.................................     (822,957)     (583,624)
Unearned income.............................................      (28,618)      (16,166)
                                                              -----------   -----------
                                                              $64,526,115   $47,243,487
                                                              ===========   ===========
</TABLE>
 
NOTE 5 -- ALLOWANCE FOR CREDIT LOSSES
 
     The following schedule shows the changes in the allowance for credit
losses:
 
<TABLE>
<CAPTION>
                                                           1997       1996       1995
                                                         --------   --------   --------
<S>                                                      <C>        <C>        <C>
BALANCE, Beginning of Year.............................  $583,624   $538,049   $463,749
  Provision charged to operating expense...............   270,000     60,000     70,000
  Recoveries of loans previously charged off...........     4,072      3,867      7,810
  Loans charged off....................................   (34,739)   (18,292)    (3,510)
                                                         --------   --------   --------
BALANCE, End of Year...................................  $822,957   $583,624   $538,049
                                                         ========   ========   ========
</TABLE>
 
                                      F-10
<PAGE>   100
                       INTERWEST BANCORP AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     Impairment of loans having carrying values of $637,452 and $99,204 at
December 31, 1997 and 1996, respectively, has been recognized in conformity with
FASB Statement No. 114, Accounting by Creditors for Impairment of a Loan. The
total allowance for credit losses related to those loans was $63,745 and $9,904.
For impairment recognized in conformity with FASB Statement No. 114, the entire
change in present value of expected cash flows is reported as provision for
credit losses in the same manner in which impairment initially was recognized or
as a reduction in the amount of provision for credit losses that otherwise would
be reported.
 
     During 1997 and 1996, the average recorded investment in impaired loans was
$368,328 and $194,810, respectively. The amount of interest income recognized
during 1997 and 1996 on impaired loans was approximately $0, since cash receipts
on impaired loans are recognized as a reduction of the loan investment.
 
     The risk of loss varies with the type of loan being made and the financial
condition of the borrower throughout the term of the loan.
 
NOTE 6 -- PREMISES AND EQUIPMENT
 
     Premises and equipment owned consisted of the following at December 31:
 
<TABLE>
<CAPTION>
                                                                 1997         1996
                                                              ----------   ----------
<S>                                                           <C>          <C>
Land........................................................  $1,184,096   $1,184,096
Building and improvements...................................   2,911,093    2,902,241
Furniture, fixtures, and equipment..........................   2,535,077    2,354,958
                                                              ----------   ----------
                                                               6,630,266    6,441,295
  Less: Accumulated depreciation and amortization...........   1,869,969    1,739,709
                                                              ----------   ----------
                                                              $4,760,297   $4,701,586
                                                              ==========   ==========
</TABLE>
 
     Depreciation and amortization expense for the years 1997, 1996, and 1995
amounted to $398,098, $262,990, and $218,958, respectively.
 
NOTE 7 -- INCOME TAXES
 
     A reconciliation of income tax at the statutory rate to the Company's
effective rate is as follows:
 
<TABLE>
<CAPTION>
                                                           1997       1996      1995
                                                           -----     ------     -----
<S>                                                        <C>       <C>        <C>
Statutory rate...........................................   34.0%     34.0%      34.0%
Capital loss carryforward with no expected future
  benefit................................................    0.0       0.0        4.6
Benefit of capital loss carryforward.....................    0.0      (1.1)       0.0
Nondeductible expenses...................................    1.3        .5         .3
          Other, net.....................................    0.0        .2         .3
                                                           -----     -----      -----
                                                            35.3%     33.6%      39.3%
                                                           =====     =====      =====
</TABLE>
 
                                      F-11
<PAGE>   101
                       INTERWEST BANCORP AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     Deferred income taxes result from temporary differences in the basis of
assets and liabilities for financial reporting and income taxes. The source of
these temporary differences and their resulting effect on income tax expense is
as follows:
 
<TABLE>
<CAPTION>
                                                           1997       1996       1995
                                                         --------   --------   --------
<S>                                                      <C>        <C>        <C>
Provision for loan losses..............................  $(91,800)  $(20,400)  $(23,800)
Provision for other real estate owned losses...........    (6,240)    (1,856)    (8,870)
Mortgage servicing rights..............................    36,747     21,744         --
Sale of assets.........................................    15,914      3,911       (375)
Unrealized gain/loss on securities.....................        --     44,236     44,512
Other, net.............................................     7,769      3,901     15,853
                                                         --------   --------   --------
                                                         $(37,610)  $ 51,536   $ 27,320
                                                         ========   ========   ========
</TABLE>
 
     Significant components of the deferred tax liabilities and assets at
December 31 are as follows:
 
<TABLE>
<CAPTION>
                                                                1997       1996
                                                              --------   --------
<S>                                                           <C>        <C>
Deferred tax liabilities:
  Depreciation..............................................  $ 99,338   $ 80,512
  Mortgage servicing rights.................................    59,555     21,816
                                                              --------   --------
                                                               158,893    102,328
                                                              --------   --------
Deferred tax assets:
  Loan loss reserve.........................................   233,883    142,083
  Other real estate owned reserve...........................    46,419     40,179
  Other.....................................................    22,832     21,975
                                                              --------   --------
                                                               303,134    204,237
                                                              --------   --------
Net deferred tax asset......................................  $144,241   $101,909
                                                              ========   ========
</TABLE>
 
NOTE 8 -- OTHER ASSETS
 
     Other assets consist of the following at December 31:
 
<TABLE>
<CAPTION>
                                                                 1997         1996
                                                              ----------   ----------
<S>                                                           <C>          <C>
Interest receivable.........................................  $  394,352   $  332,117
Other receivables...........................................     199,023      128,569
Federal Home Loan Bank stock................................     398,900      153,300
Other real estate owned, net of valuation allowance of
  $136,527 and $118,174, respectively.......................     316,988      613,668
Mortgage servicing rights...................................     175,161       63,952
Other.......................................................     181,307      175,242
                                                              ----------   ----------
                                                              $1,665,731   $1,466,848
                                                              ==========   ==========
</TABLE>
 
NOTE 9 -- WAREHOUSE NOTES PAYABLE
 
     The mortgage company finances the funding of mortgage loans through
short-term warehouse lines of credit. Such borrowings are collateralized by
mortgage loans with a carrying amount of $1,160,346 and $4,741,957 at December
31, 1997 and 1996, respectively. Interest is charged at rates of .375% to 1.00%
above each bank's prime interest rate. The U.S. Bank agreement provided for a
line of credit in the amount of $7,000,000 and matures on May 31, 1999. The
agreement with Franklin Federal Bancorp provided for a line of credit in the
amount of $8,500,000. The agreement terminated during 1997 at its maturity.
 
                                      F-12
<PAGE>   102
                       INTERWEST BANCORP AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     Warehouse notes payable consist of the following at December 31:
 
<TABLE>
<CAPTION>
                                                                 1997         1996
                                                              ----------   ----------
<S>                                                           <C>          <C>
U.S. Bank...................................................  $1,129,070   $1,370,145
Franklin Federal Bancorp....................................          --    2,940,135
                                                              ----------   ----------
                                                              $1,129,070   $4,310,280
                                                              ==========   ==========
</TABLE>
 
NOTE 10 -- CREDIT ARRANGEMENT
 
     The Bank subsidiary had a credit line with the Federal Home Loan Bank of
San Francisco (FHLB), whereby the Bank could borrow certain amounts based on the
amount of collateral pledged. This credit line required the Bank to maintain
certain collateral maintenance, credit, and other requirements as set forth by
FHLB. The line was secured by mortgage loans with a carrying value of $9,917,000
as of December 31, 1996, which gave the Bank the ability to borrow $6,257,650.
There were no borrowings on this line during 1996. The Bank closed this line of
credit during 1997 because of a change in reporting requirements for FHLB.
 
NOTE 11 -- COMMITMENTS AND CONTINGENT LIABILITIES
 
     The Bancorp's financial statements do not reflect various commitments and
contingent liabilities which arise in the normal course of business and which
involve elements of credit risk, interest rate risk, and liquidity risk. These
commitments and contingent liabilities are commitments to extend credit,
commercial letters of credit, and standby letters of credit. A summary of the
Bank's commitments and contingent liabilities at December 31 is as follows:
 
<TABLE>
<CAPTION>
                                                     1997          1996          1995
                                                  -----------   -----------   -----------
<S>                                               <C>           <C>           <C>
Commitments to extend credit....................  $23,625,798   $17,403,265   $12,074,000
Letters of credit...............................    1,535,810     1,209,489       477,264
                                                  -----------   -----------   -----------
                                                  $25,161,608   $18,612,754   $12,551,264
                                                  ===========   ===========   ===========
</TABLE>
 
     Commitments to extend credit and letters of credit include exposure to some
credit loss in the event of nonperformance of the customer. The Bank's credit
policies and procedures for credit commitments and financial guarantees are the
same as those for extension of credit that are recorded on the statements of
condition. Because these instruments have fixed maturity dates, and because many
of them expire without being drawn upon, they do not generally present any
significant liquidity risk to the Bank. The Bank has not been required to
perform on any financial guarantees during the past three years. The Bank did
not incur any significant losses on its commitments in 1997, 1996 or 1995.
 
     The Bancorp is involved in ongoing litigation arising in the normal course
of business. Management, after consultation with legal counsel, believes that
the liabilities, if any, arising from such litigation and claims will not be
material to the Bancorp's financial condition.
 
NOTE 12 -- LEASE COMMITMENTS
 
     The companies rent office space and equipment under various operating
leases. Substantially all rental expense reported in the accompanying statements
of income is attributable to minimum rent under such leases.
 
                                      F-13
<PAGE>   103
                       INTERWEST BANCORP AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     Future minimum payments by year under operating leases with initial or
remaining noncancellable terms of one year or more, consisted of the following
at December 31, 1997:
 
<TABLE>
<S>                                                           <C>
1998........................................................  $  373,140
1999........................................................     273,740
2000........................................................     215,815
2001........................................................     210,812
2002........................................................     198,215
Future years................................................     455,777
                                                              ----------
          Total Minimum Future Rental Payments..............  $1,727,499
                                                              ==========
</TABLE>
 
     Total rental expense included in the statements of income for 1997, 1996,
and 1995 was $332,410, $291,979, and $435,303, respectively.
 
NOTE 13 -- RELATED PARTY TRANSACTIONS
 
     Certain directors and officers of InterWest Bancorp and Subsidiaries and
their associates were customers of, and had transactions with, the Bank in the
ordinary course of business during 1997, 1996, and 1995.
 
NOTE 14 -- CONCENTRATION OF CREDIT RISK
 
     The Bank grants residential loans and other types of loans to customers
throughout Nevada. Although the Bank has a diversified loan portfolio, a
substantial portion of its debtors' abilities to honor their contracts is
dependent on the economic conditions in Nevada.
 
     The mortgage company originates residential mortgage loans to customers in
Nevada, Idaho, and Oregon. Accordingly, the company's ability to originate
additional loans is dependent on the economic conditions in these areas.
 
NOTE 15 -- EMPLOYEE BENEFIT PLANS
 
     The company has a Profit Sharing and Thrift Plan (including Section 401(k)
provisions of the Internal Revenue Code). The Plan is available to all employees
who meet certain service requirements. The Profit Sharing and Thrift Plan
contains a matching provision, whereby the company can partially match employee
contributions to the 401(k) Plan. Contributions to the Plan for 1997, 1996, and
1995 were not material.
 
NOTE 16 -- STOCK OPTION PLAN
 
     During 1996, the company adopted a key employee stock option plan. The
exercise price of each option is equal to the market price of the company's
stock on the date of exercise of the option. Since the strike price of the
option is the same as the fair value of the stock, no compensation cost is
recorded in accordance with FASB Statement No. 123. The maximum term of the
options is five years, and they vest immediately upon issuance. During 1996,
130,000 options were issued, 68,376 options were exercised at strike prices
ranging from $1.88 to $2.18 per share. There were 61,624 options outstanding at
December 31, 1996.
 
     During 1997, 174,000 options were issued and 18,765 were exercised at
strike prices ranging from $2.17 to $2.35 per share. All unexercised options at
December 31, 1997 that were issued during 1997, expired on December 31, 1997. In
addition, 9,000 options issued in 1996 were exercised during 1997 at strike
prices ranging from $2.17 to $2.35 per share.
 
     There were 52,624 options outstanding at December 31, 1997.
 
                                      F-14
<PAGE>   104
                       INTERWEST BANCORP AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
NOTE 17 -- REGULATORY MATTERS
 
     The Bancorp's subsidiary (InterWest Bank) is subject to various regulatory
capital requirements administered by the federal banking agencies. Failure to
meet minimum capital requirements can initiate certain mandatory and possibly
additional discretionary actions by regulators that, if undertaken, could have a
direct material effect on the Bank's financial statements. Under capital
adequacy guidelines and the regulatory framework for prompt corrective action,
the Bank must meet specific capital guidelines that involve quantitative
measures of the Bank's assets, liabilities, and certain off-balance-sheet items
as calculated under regulatory accounting practices. The Bank's capital amounts
and classification are also subject to qualitative judgments by the regulators
about components, risk weightings, and other factors.
 
     Quantitative measures established by regulation to ensure capital adequacy
require the Bank to maintain minimum amounts and ratios (set forth in the table
below) of total and Tier I capital (as defined in the regulations) to
risk-weighted assets (as defined), and of Tier I capital (as defined) to average
assets (as defined). Management believes, as of December 31, 1997, that the Bank
meets all capital adequacy requirements to which it is subject.
 
     As of December 31, 1997, the most recent notification from the federal
banking agencies categorized the Bank as adequately capitalized under the
regulatory framework for prompt corrective action. To be categorized as
adequately capitalized, the Bank must maintain minimum total risk-based, Tier I
risk-based, and Tier I leverage ratios as set forth in the table. There are no
conditions or events since that notification that management believes have
changed the institution's category.
 
     The Bank's actual capital amounts and ratios are presented below.
 
<TABLE>
<CAPTION>
                                                                                      TO BE WELL
                                                                                   CAPITALIZED UNDER
                                                              FOR CAPITAL          PROMPT CORRECTIVE
                                           ACTUAL          ADEQUACY PURPOSES       ACTION PROVISIONS
                                     ------------------   -------------------     -------------------
                                       AMOUNT     RATIO     AMOUNT      RATIO       AMOUNT      RATIO
                                     ----------   -----   -----------   -----     -----------   -----
<S>                                  <C>          <C>     <C>           <C>       <C>           <C>
As of December 31, 1997:
  Total Capital
     (to Risk Weighted Assets).....  $7,036,000    9.1%   >=$6,187,000   >=8.0%   >=$7,734,000   >=10.0%
  Tier I Capital
     (to Risk Weighted Assets).....   6,213,000    8.0     >=3,094,000   >=4.0     >=4,641,000    >=6.0
  Tier I Capital
     (to Average Assets)...........   6,213,000    7.1     >=3,318,000   >=4.0     >=4,148,000    >=5.0
As of December 31, 1996:
  Total Capital
     (to Risk Weighted Assets).....  $6,099,000   11.1%   >=$4,398,000   >=8.0%   >=$5,498,000   >=10.0%
  Tier I Capital
     (to Risk Weighted Assets).....   5,515,000   10.0     >=2,199,000   >=4.0     >=3,299,000    >=6.0
  Tier I Capital
     (to Average Assets)...........   5,515,000    9.3     >=2,360,000   >=4.0     >=2,950,000    >=5.0
</TABLE>
 
NOTE 18 -- FAIR VALUE OF FINANCIAL INSTRUMENTS
 
     SFAS No. 107, "Disclosures about Fair Values of Financial Instruments,"
requires disclosure of information about the fair value of financial instruments
for which it is practicable to estimate a value, whether or not recognized in
the statement of condition. Whenever possible, quoted market prices are used to
estimate fair values. In cases where quoted market prices are not available,
fair values are based on estimates using present value or other valuation
techniques. Those techniques are significantly affected by the assumptions used,
including the discount rate and estimates of future cash flows. Therefore, in
many cases, the estimated fair values may not be realized in an immediate sale
of the instruments.
 
                                      F-15
<PAGE>   105
                       INTERWEST BANCORP AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     SFAS No. 107 excludes certain financial instruments and all non-financial
instruments from its disclosure requirements. Accordingly, the aggregate of the
estimated fair value amounts is not intended to represent the underlying value
of the Bancorp.
 
     The carrying amounts and the estimated fair values are as follows:
 
<TABLE>
<CAPTION>
                                                                  DECEMBER 31, 1997
                                                              -------------------------
                                                               CARRYING      ESTIMATED
                                                                AMOUNT      FAIR VALUE
                                                              -----------   -----------
<S>                                                           <C>           <C>
Assets:
  Cash and cash equivalents.................................  $14,721,762   $14,721,762
  Federal Home Loan Bank Stock..............................      398,900       398,900
  Loans receivable..........................................   77,867,138    77,945,604
                                                              -----------   -----------
          Total Asset Financial Instruments.................  $92,987,800   $93,066,266
                                                              ===========   ===========
Liabilities:
  Deposits..................................................  $89,314,380   $89,336,585
  Long-term debt............................................       28,964        28,964
  Warehouse note payable....................................    1,129,070     1,129,070
                                                              -----------   -----------
          Total Liability Financial Instruments.............  $90,472,414   $90,494,619
                                                              ===========   ===========
</TABLE>
 
<TABLE>
<CAPTION>
                                                                  DECEMBER 31, 1996
                                                              -------------------------
                                                               CARRYING      ESTIMATED
                                                                AMOUNT      FAIR VALUE
                                                              -----------   -----------
<S>                                                           <C>           <C>
Assets:
  Cash and cash equivalents.................................  $11,312,786   $11,312,786
  Federal Home Loan Bank Stock..............................      153,300       153,300
  Loans receivable..........................................   57,202,476    57,253,200
                                                              -----------   -----------
          Total Asset Financial Instruments.................  $68,668,562   $68,719,286
                                                              ===========   ===========
Liabilities:
  Deposits..................................................  $62,548,095   $62,563,889
  Warehouse notes payable...................................    4,310,280     4,310,280
                                                              -----------   -----------
          Total Liability Financial Instruments.............  $66,858,375   $66,874,169
                                                              ===========   ===========
</TABLE>
 
     The following methods and assumptions were used by the Bancorp in
estimating its fair value disclosures for financial instruments.
 
CASH AND CASH EQUIVALENTS
 
     The carrying amounts reported in the statement of financial condition for
cash and cash equivalents approximate those assets' fair values.
 
FEDERAL HOME LOAN BANK STOCK
 
     Fair value for Federal Home Loan Bank stock is based on its par value since
it is redeemable at par.
 
LOANS RECEIVABLE
 
     For variable-rate loans that re-price frequently and with no significant
change in credit risk, fair values are based on carrying amounts. The fair
values of fixed-rate mortgage loans are based on quoted market prices of similar
loans sold, adjusted for differences in loan characteristics. The fair values of
other fixed-rate loans are
 
                                      F-16
<PAGE>   106
                       INTERWEST BANCORP AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
estimated using discounted cash flow analysis, at interest rates currently being
offered for loans with similar terms to borrowers of similar credit quality.
 
DEPOSIT LIABILITIES
 
     The carrying amounts for interest-bearing and non-interest-bearing demand,
savings, money market, and NOW accounts approximate those liabilities' fair
values. Fair values for fixed-rate certificates of deposit are estimated using a
discounted cash flow calculation that applies interest rates currently being
offered on certificates to a schedule of aggregated expected monthly maturities
on time deposits.
 
LONG-TERM DEBT
 
     The fair value of long-term debt is calculated based on the discounted
value of contracted cash flows. The discount rate is estimated using the rates
currently available for similar debt with similar maturities.
 
WAREHOUSE NOTES PAYABLE
 
     The carrying value of the warehouse note payable approximates its fair
value because of the relatively short-term nature of the instrument.
 
NOTE 19 -- PARENT COMPANY STATEMENTS
 
<TABLE>
<CAPTION>
                                                              DECEMBER 31,   DECEMBER 31,
                                                                  1997           1996
                                                              ------------   ------------
<S>                                                           <C>            <C>
Condensed Balance Sheets:
  Assets:
     Cash...................................................   $   74,569     $  132,855
     Due from subsidiaries..................................           --          1,420
     Investment in bank subsidiary..........................    5,340,861      4,735,829
     Investment in non-bank subsidiary......................    1,731,597      1,752,650
     Other assets...........................................       79,491         39,096
                                                               ----------     ----------
          Total Assets......................................   $7,226,518     $6,661,850
                                                               ==========     ==========
Liabilities and Stockholders' Equity:
  Liabilities:
     Due to subsidiaries....................................   $   72,145     $   28,046
     Other liabilities......................................           --            454
                                                               ----------     ----------
                                                                   72,145         28,500
  Stockholders' equity......................................    7,154,373      6,633,350
                                                               ----------     ----------
          Total Liabilities and Stockholders' Equity........   $7,226,518     $6,661,850
                                                               ==========     ==========
</TABLE>
 
<TABLE>
<CAPTION>
                                                                        DECEMBER 31,
                                                             -----------------------------------
                                                               1997         1996         1995
                                                             ---------   -----------   ---------
<S>                                                          <C>         <C>           <C>
Condensed Statements of Income:
  Cash dividends from bank subsidiary......................  $  63,863   $   255,450   $ 255,228
  Cash dividends from non-bank subsidiary..................     14,670       847,600          --
  Interest income..........................................      2,421         1,664       1,468
  Other income.............................................      1,876            --          --
  Expenses.................................................     (8,502)      (48,954)    (80,412)
                                                             ---------   -----------   ---------
  Income before equity in undistributed net income of
     subsidiaries..........................................     74,328     1,055,760     176,284
</TABLE>
 
                                      F-17
<PAGE>   107
                       INTERWEST BANCORP AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
<TABLE>
<CAPTION>
                                                                        DECEMBER 31,
                                                             -----------------------------------
                                                               1997         1996         1995
                                                             ---------   -----------   ---------
<S>                                                          <C>         <C>           <C>
  Equity in undistributed net income loss of
     subsidiaries..........................................  $ 578,553   $   (83,999)  $ 803,798
                                                             ---------   -----------   ---------
          Net Income.......................................  $ 652,881   $   971,761   $ 980,082
                                                             =========   ===========   =========
Condensed Statements of Cash Flows:
  Cash flows from operating activities:
     Net income............................................  $ 652,881   $   971,761   $ 980,082
     Adjustments to reconcile net income to net cash
       provided by operating activities:
       Equity in undistributed net income of
          subsidiaries.....................................   (578,553)       83,999    (803,798)
          Amortization.....................................         --           691       4,104
          Unrealized (gain) on purchase of subsidiary's
            stock..........................................     (1,873)           --          --
          Change in due from subsidiaries..................      1,420         7,889      41,718
          Change in other assets...........................    (40,395)      (27,344)    (11,752)
          Change in due to subsidiaries....................     44,099        28,046          --
          Change in other liabilities......................       (455)      (17,851)    (57,062)
                                                             ---------   -----------   ---------
          Net Cash Provided (Used) by Operating
            Activities.....................................     77,124     1,047,191     153,292
                                                             ---------   -----------   ---------
Cash Flows from Investing Activities:
  Purchase of subsidiary stock.............................     (3,624)           --          --
                                                             ---------   -----------   ---------
          Net Cash Provided (Used) by Investing
            Activities.....................................     (3,624)           --          --
                                                             ---------   -----------   ---------
Cash Flows from Financing Activities:
  Sale of stock............................................     61,516       134,060          --
  Dividends paid...........................................   (193,302)           --          --
  Payments on note payable.................................         --    (1,060,000)   (190,000)
                                                             ---------   -----------   ---------
          Net Cash Provided (Used) by Financing
            Activities.....................................   (131,786)     (925,940)   (190,000)
                                                             ---------   -----------   ---------
          Net Increase (Decrease) in Cash..................    (58,286)      121,251     (36,708)
Cash, beginning of year....................................    132,855        11,604      48,312
                                                             ---------   -----------   ---------
Cash, end of year..........................................  $  74,569   $   132,855   $  11,604
                                                             =========   ===========   =========
</TABLE>
 
NOTE 20 -- SUBSEQUENT EVENTS
 
     During June of 1998, Colonial Bancgroup, Inc. announced its plan to acquire
InterWest Bancorp. In the transaction, each share of InterWest Bancorp stock
will be exchanged for .2357 shares of Colonial Bancgroup, Inc. stock. The
acquisition is contingent upon approval by the stockholders of both companies
and the applicable regulatory agencies.
 
                                      F-18
<PAGE>   108
 
                       INTERWEST BANCORP AND SUBSIDIARIES
 
                UNAUDITED CONSOLIDATED CONDENSED BALANCE SHEETS
 
<TABLE>
<CAPTION>
                                                                   JUNE 30,
                                                              ------------------
                                                                1998      1997
                                                              --------   -------
                                                                (IN THOUSANDS)
<S>                                                           <C>        <C>
                                     ASSETS
Cash and due from banks.....................................  $  6,088   $ 4,723
Federal funds sold..........................................    22,896     2,574
Investment securities available for sale....................       297       207
Loans receivable (net of allowance for loan losses, deferred
  loan fees and unearned discounts of $1,317 in 1998 and
  $996 in 1997).............................................    94,585    65,034
Premises and equipment, net.................................     4,735     4,694
Other assets................................................     1,853     1,528
                                                              --------   -------
          Total assets......................................  $130,454   $78,760
                                                              ========   =======
                                  LIABILITIES
Deposits:
  Non-interest bearing demand deposits......................  $ 25,116   $14,683
  Savings, NOW and money market accounts....................    41,299    36,710
  Time deposits, $100,000 and over..........................    21,880     5,739
  Other time deposits.......................................    27,433    10,865
                                                              --------   -------
          Total deposits....................................   115,728    67,997
Accrued expenses and other liabilities......................       791       540
Long-term debt..............................................        26        32
Warehouse notes payable.....................................     5,216     2,653
                                                              --------   -------
          Total liabilities.................................   121,761    71,222
                                                              --------   -------
Minority interest...........................................       936       818
                                                              --------   -------
Stockholders' equity:
  Common stock -- no par value, authorized 3,500,000 shares,
     issued and outstanding 3,075,075 shares and 3,013,721
     shares at June 30, 1998 and 1997, respectively.........     1,547     1,399
  Retained earnings.........................................     6,210     5,321
                                                              --------   -------
          Total Stockholders Equity.........................     7,757     6,720
                                                              --------   -------
          Total Liabilities, Minority Interest, and
           Stockholders Equity..............................  $130,454   $78,760
                                                              ========   =======
</TABLE>
 
See accompanying notes to unaudited consolidated condensed financial statements.
 
                                      F-19
<PAGE>   109
 
                       INTERWEST BANCORP AND SUBSIDIARIES
 
             UNAUDITED CONSOLIDATED CONDENSED STATEMENTS OF INCOME
 
<TABLE>
<CAPTION>
                                                              SIX MONTHS ENDED JUNE 30,
                                                              -------------------------
                                                                 1998          1997
                                                              -----------   -----------
                                                                   (IN THOUSANDS)
<S>                                                           <C>           <C>
INTEREST INCOME
  Interest and fees on loans................................  $    8,154    $    6,208
  Interest on federal funds sold............................         334           163
  Interest on deposits with banks...........................          12             5
                                                              ----------    ----------
          Total Interest Income.............................       8,500         6,376
                                                              ----------    ----------
INTEREST EXPENSE
  Interest on deposits......................................       2,054         1,260
  Interest on long-term debt................................           1             7
  Interest on warehouse notes payable.......................         144            79
                                                              ----------    ----------
          Total Interest Expense............................       2,199         1,346
                                                              ----------    ----------
     Net Interest Income....................................       6,301         5,030
Provision for credit losses.................................         126           150
                                                              ----------    ----------
     Net Interest Income After Provision for Credit
      Losses................................................       6,175         4,880
                                                              ----------    ----------
OTHER INCOME
  Service Charges on deposits...............................         105           107
  Realized gain (loss) on trading securities................           0             1
  Other income..............................................         128           124
                                                              ----------    ----------
          Total Noninterest Income..........................         233           232
                                                              ----------    ----------
OTHER EXPENSES
  Salaries and employee benefits............................       3,368         2,955
  Occupancy and equipment expense...........................         589           554
  Other expense.............................................       1,517         1,175
                                                              ----------    ----------
          Total Noninterest Expense.........................       5,474         4,684
                                                              ----------    ----------
     Income Before Income Taxes.............................         934           428
Provision for income tax expense............................         319           145
                                                              ----------    ----------
          Net Income Before Minority Interest...............         615           283
Minority Interest in income of subsidiary...................          70            49
                                                              ----------    ----------
          Net Income........................................  $      545    $      234
                                                              ==========    ==========
Earnings per share..........................................  $     0.18    $     0.08
                                                              ==========    ==========
Weighted average number of common shares outstanding........   3,027,431     2,997,080
                                                              ==========    ==========
</TABLE>
 
See accompanying notes to unaudited consolidated condensed financial statements.
 
                                      F-20
<PAGE>   110
 
                       INTERWEST BANCORP AND SUBSIDIARIES
 
           UNAUDITED CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                               SIX MONTHS ENDED
                                                                   JUNE 30,
                                                              ------------------
                                                                1998      1997
                                                              --------   -------
                                                                (IN THOUSANDS)
<S>                                                           <C>        <C>
CASH FLOWS FROM OPERATING ACTIVITIES
  Net Income................................................  $    545   $   234
  Adjustments to reconcile net income to net cash provided
     by operating activities:
     Depreciation and amortization..........................       223       202
     Minority interest in income of subsidiary..............        70        49
     Provision for credit (recoveries) losses...............       126       150
     (Gain) loss on sale of fixed assets....................       (10)      (14)
     (Increase) decrease in:
       Loans held for sale..................................    (5,439)   (1,628)
       Other assets.........................................      (296)     (132)
     Increase (decrease) in:
       Accrued expenses and other liabilities...............       152        24
       Warehouse note payable...............................     4,087    (1,657)
                                                              --------   -------
          Net Cash Provided (Used) by Operating
           Activities.......................................      (542)   (2,772)
                                                              --------   -------
CASH FLOWS FROM INVESTING ACTIVITIES
  Purchase (Sale) of Federal Home Loan Bank stock...........       102       (54)
  Purchase of subsidiary stock..............................        (3)        0
  Net (increase) decrease in loans..........................   (11,620)   (6,425)
  Sale of other real estate owned...........................         0       182
  Acquisition of other real estate owned....................         0      (119)
  Acquisition of premises and equipment, net................      (153)     (163)
  (Increase) decrease in deposits...........................        11        11
                                                              --------   -------
          Net Cash Provided (Used) by Investing
           Activities.......................................   (11,663)   (6,568)
                                                              --------   -------
CASH FLOWS FROM FINANCING ACTIVITIES
  Net increase (decrease) in:
     Demand deposits........................................     7,321     5,944
     Savings, NOW and Money Market deposits.................     3,357     6,784
     Time Deposits -- $100,000 and over.....................    12,042    (1,949)
     Other time deposits....................................     3,693    (5,330)
  Net proceeds (payments) on long term debt.................        (3)       32
  Dividends paid by subsidiary to minority stockholders.....         0       (11)
  Dividends paid to stockholders............................       (76)     (193)
  Sale of stock.............................................       133        47
                                                              --------   -------
          Net Cash Provided (Used) by Financing
           Activities.......................................    26,467     5,324
                                                              --------   -------
          Net Increase (Decrease) in Cash and Cash
           Equivalents......................................    14,262    (4,016)
CASH AND CASH EQUIVALENTS, Beginning........................    14,722    11,313
                                                              --------   -------
CASH AND CASH EQUIVALENTS, Ending...........................  $ 28,984   $ 7,297
                                                              ========   =======
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
     Cash paid during the period for:
       Interest.............................................  $  2,128   $ 1,357
                                                              ========   =======
       Income Taxes.........................................  $    267   $   167
                                                              ========   =======
</TABLE>
 
See accompanying notes to unaudited consolidated condensed financial statements.
 
                                      F-21
<PAGE>   111
 
                       INTERWEST BANCORP AND SUBSIDIARIES
 
         NOTES TO UNAUDITED CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                    SIX MONTHS ENDED JUNE 30, 1998 AND 1997
 
1. BASIS OF PRESENTATION
 
     The accompanying unaudited condensed consolidated financial statements have
been prepared in accordance with the instructions for interim financial
statements and do not include all of the information and footnotes required by
generally accepted accounting principles for complete financial statements.
These unaudited condensed consolidated financial statements should be read in
conjunction with the audited consolidated financial statements and notes thereto
for the years ended December 31, 1997 and 1996. In the opinion of the Company,
the financial statements reflect all adjustments which are of a normal recurring
nature and which are necessary to present fairly the financial position of the
Company as of June 30, 1998 and the results of operations for the six months
ended June 30, 1998 and 1997, and cash flows for the six months ended June 30,
1998 and 1997. The results of operations for the six months ended June 30, 1998
are not necessarily indicative of the results which may be expected for the
entire fiscal year.
 
2. STOCK OPTIONS
 
     In April, 1998, 33,000 non-qualified stock options were issued to employees
at an exercise price to be determined based upon book value information
available at each quarter end. As of June 30, 1998, 27.27% were vested. No
compensation expense has been recorded as it is assumed that book value is the
equivalent of market value due to the lack of trading.
 
                                      F-22
<PAGE>   112
 
                                                                      APPENDIX C
 
                             STOCK OPTION AGREEMENT
 
     STOCK OPTION AGREEMENT, dated as of June 16, 1998 (the "Agreement"), by and
between InterWest Bancorp, a Nevada corporation ("Issuer"), and The Colonial
BancGroup, Inc., a Delaware corporation ("Grantee").
 
     WHEREAS, Grantee and Issuer have entered into an Agreement and Plan of
Merger dated as of June 16, 1998 (the "Merger Agreement"), providing for, among
other things, the merger of Issuer with and into Grantee, with Grantee as the
surviving corporation; and
 
     WHEREAS, as a condition and inducement to Grantee's execution of the Merger
Agreement, Grantee has required that Issuer agree, and Issuer has agreed, to
grant Grantee the Option (as defined below);
 
     NOW THEREFORE, in consideration of the foregoing and the respective
representations, warranties, covenants, and agreements set forth herein and in
the Merger Agreement, and intending to be legally bound hereby, Issuer and
Grantee agree as follows:
 
          1. Defined Terms.  Capitalized terms which are used but not defined
     herein shall have the meanings ascribed to such terms in the Merger
     Agreement.
 
          2. Grant of Option.  Subject to the terms and conditions set forth
     herein, Issuer hereby grants to Grantee an irrevocable option (the
     "Option") to purchase from time to time up to 605,709 shares (as adjusted
     as set forth herein) (the "Option Shares"), of Common Stock, without par
     value ("Issuer Common Stock"), of Issuer at a purchase price per Option
     Share (the "Purchase Price") equal to $8.25; provided, however, that in no
     event shall the number of shares for which this option is exercisable
     exceed 19.9% of the outstanding shares of Issuer Common Stock.
 
          3. Exercise of Option.  (a) Provided that (i) Grantee shall not be in
     material breach of the agreements or covenants contained in this Agreement
     or the Merger Agreement, and (ii) no preliminary or permanent injunction or
     other order against the delivery of shares covered by the Option issued by
     any court of competent jurisdiction in the United States shall be in
     effect, Grantee may exercise the Option, in whole or in part, at any time
     and from time to time following the occurrence of a Purchase Event (as
     defined below); provided that the Option shall terminate and be of no
     further force or effect upon the earliest to occur of (A) the Effective
     Date, or (B) termination of the Merger Agreement in accordance with the
     terms thereof prior to the occurrence of a Purchase Event or a Preliminary
     Purchase Event, (C) termination of the Merger Agreement in accordance with
     the terms thereof after the occurrence of a Purchase Event or a Preliminary
     Purchase Event (other than a termination of the Merger Agreement by Grantee
     due to a material breach by Issuer in accordance with Section 13.2(b) of
     the Merger Agreement or a termination due to the failure to fulfill
     conditions set forth in Sections 8.1, 10.1, 10.3, 10.4, 10.6, 10.7, 10.9 or
     10.11 of the Merger Agreement), or (D) eighteen months after termination of
     the Merger Agreement following the occurrence of a Purchase Event or a
     Preliminary Purchase Event, provided that the termination of the Merger
     Agreement was due to one of the reasons listed in the parenthetical of
     Clause (C) above; and provided further, that any purchase of shares upon
     exercise of the Option shall be subject to compliance with applicable law
     including, without limitation, the Bank Holding Company Act of 1956, as
     amended (the "BHC Act"). The rights set forth in Section 8 shall terminate
     when the right to exercise the Option terminates (other than as a result of
     a complete exercise of the Option) as set forth herein.
 
     (b) As used herein, a "Purchase Event" means any of the following events:
 
          (i) Without Grantee's prior written consent, Issuer shall have
     authorized, recommended, publicly proposed, or publicly announced an
     intention to authorize, recommend, or propose, or shall have entered into
     any agreement with any person (other than Grantee or any subsidiary of
     Grantee) to effect an Acquisition Transaction (as defined below). As used
     herein, the term Acquisition Transaction shall mean (A) a merger,
     consolidation, or other business combination involving Issuer, (B) the
     disposition, by sale,
                                       C-1
<PAGE>   113
 
     lease, exchange, or otherwise, of assets of Issuer or any of its
     subsidiaries representing in either case all or substantially all of the
     consolidated assets of Issuer, or (C) the issuance, sale, or other
     disposition of (including by way of merger, consolidation, share exchange,
     or any similar transaction) securities representing 25% or more of the
     voting power of Issuer; or
 
          (ii) any person (other than Grantee or any subsidiary of Grantee)
     shall have acquired beneficial ownership (as such term is defined in Rule
     13d-3 promulgated under the Securities Exchange Act of 1934 (the "1934
     Act")) of or the right to acquire beneficial ownership of, or any "group"
     (as such term is defined under the 1934 Act) shall have been formed which
     beneficially owns or has the right to acquire beneficial ownership of, 25%
     or more of the then outstanding shares of Issuer Common Stock.
 
     (c) As used herein, a "Preliminary Purchase Event" means any of the
following events:
 
          (i) any person (other than Grantee or any subsidiary of Grantee) shall
     have commenced (as such term is defined in Rule 14d-2 under the 1934 Act),
     or shall have filed a registration statement under the 1933 Act with
     respect to, a tender offer or exchange offer to purchase any shares of
     Issuer Common Stock such that, upon consummation of such offer, such person
     would own or control 25% or more of the then outstanding shares of Issuer
     Common Stock (such an offer being referred to herein as a "Tender Offer" or
     an "Exchange Offer," respectively); or
 
          (ii) (1) the holders of Issuer Common Stock shall not have approved
     the Merger Agreement at the meeting of such stockholders held for the
     purpose of voting on the Merger Agreement, (2) such meeting shall not have
     been held or shall have been canceled prior to termination of the Merger
     Agreement, (3) the Issuer's Board of Directors or any person representing
     such Board shall have commenced negotiations with any person other than
     Grantee regarding an Acquisition Transaction, or (4) Issuer's Board of
     Directors shall have withdrawn or modified in a manner adverse to Grantee
     the recommendation of Issuer's Board of Directors with respect to the
     Merger Agreement, in each case after it shall have been publicly announced
     (or otherwise disclosed to the Issuer prior to such public announcement)
     that any person (other than Grantee or any subsidiary of Grantee) shall
     have (A) made, or disclosed to Issuer an intention to make, a proposal to
     engage in an Acquisition Transaction, (B) commenced a Tender Offer or filed
     a registration statement under the 1933 Act with respect to an Exchange
     Offer, or (C) filed an application (or given a notice), whether in draft or
     final form, under the BHC Act, the Bank Merger Act, or the Change in Bank
     Control Act of 1978, or other appropriate banking agency, for approval to
     engage in an Acquisition Transaction.
 
As used in this Agreement, "person" shall have the meaning specified in Sections
3(a)(9) and 13(d)(3) of the 1934 Act.
 
     (d) In the event Grantee wishes to exercise the Option, it shall send to
Issuer a written notice (the date of which being herein referred to as the
"Notice Date") specifying (i) the total number of Option Shares it intends to
purchase pursuant to such exercise and (ii) a place and date not earlier than
three business days nor later than 15 business days from the Notice Date for the
closing (the "Closing") of such purchase (the "Closing Date"). If prior
notification to or approval of the Board of Governors of the Federal Reserve
System (the "Federal Reserve Board") or any other regulatory authority is
required in connection with such purchase, Issuer shall cooperate with Grantee
in the filing of the required notice or application for approval and the
obtaining of such approval and the Closing shall occur immediately following
such regulatory approvals (and any mandatory waiting periods).
 
     4. Payment and Delivery of Certificates.  (a) On each Closing Date, Grantee
shall (i) pay to Issuer, in immediately available funds by wire transfer to a
bank account designated by Issuer, an amount equal to the Purchase Price
multiplied by the number of Option Shares to be purchased on such Closing Date,
and (ii) present and surrender this Agreement to the Issuer at the address of
the Issuer specified in Section 11(f) hereof.
 
     (b) At each Closing, simultaneously with the delivery of immediately
available funds and surrender of this Agreement as provided in Section 4(a), (i)
Issuer shall deliver to Grantee (A) a certificate or certificates representing
the Option Shares to be purchased at such Closing, which Option Shares shall be
free and clear
                                       C-2
<PAGE>   114
 
of all liens, claims, charges, and encumbrances of any kind whatsoever and
subject to no pre-emptive rights, and (B) if the Option is exercised in part
only, an executed new agreement with the same terms as this Agreement evidencing
the right to purchase the balance of the shares of Issuer Common Stock
purchasable hereunder, and (ii) Grantee shall deliver to Issuer a letter
agreeing that Grantee shall not offer to sell or otherwise dispose of such
Option Shares in violation of applicable federal and state law or of the
provisions of this Agreement.
 
     (c) In addition to any other legend that is required by applicable law,
certificates for the Option Shares delivered at each Closing shall be endorsed
with a restrictive legend which shall read substantially as follows:
 
     THE STOCK REPRESENTED BY THIS CERTIFICATE HAS NOT BEEN REGISTERED UNDER THE
     SECURITIES ACT OF 1933 OR ANY STATE LAW AND THE TRANSFER OF THE STOCK
     REPRESENTED BY THIS CERTIFICATE IS SUBJECT TO RESTRICTIONS ARISING UNDER
     THE SECURITIES ACT OF 1933, AS AMENDED, AND PURSUANT TO THE TERMS OF A
     STOCK OPTION AGREEMENT DATED AS OF JUNE 16, 1998. A COPY OF SUCH AGREEMENT
     WILL BE PROVIDED TO THE HOLDER HEREOF WITHOUT CHARGE UPON RECEIPT BY THE
     ISSUER OF A WRITTEN REQUEST THEREFOR.
 
It is understood and agreed that: (i) the reference to restrictions arising
under the 1933 Act in the above legend shall be removed by delivery of
substitute certificate(s) without such reference if Grantee shall have delivered
to Issuer a copy of a letter from the staff of the United States Securities and
Exchange Commission ("SEC"), or an opinion of counsel in form and substance
reasonably satisfactory to Issuer and its counsel, to the effect that such
legend is not required for purposes of the 1933 Act; and (ii) the reference to
restrictions pursuant to this Agreement in the above legend shall be removed by
delivery of a substitute certificate without such reference if the Option Shares
evidenced by such certificate containing such reference have been sold or
transferred in compliance with the provisions of this Agreement under
circumstances that do not require the retention of such reference.
 
     5. Representations and Warranties of Issuer.  Issuer hereby represents and
warrants to Grantee as follows:
 
          (a) Issuer has all requisite corporate power and authority to enter
     into this Agreement and, subject to any approvals referred to herein, to
     consummate the transactions contemplated hereby. The execution and delivery
     of this Agreement and the consummation of the transactions contemplated
     hereby have been duly authorized by all necessary corporate action on the
     part of Issuer. This Agreement has been duly executed and delivered by
     Issuer.
 
          (b) Issuer has taken all necessary corporate and other action to
     authorize and reserve and to permit it to issue (and at all times from the
     date hereof until the obligation to deliver Issuer Common Stock upon the
     exercise of the Option terminates, will have reserved for issuance), upon
     exercise of the Option, the number of shares of Issuer Common Stock
     necessary for Grantee to exercise the Option, and Issuer will take all
     necessary corporate action to authorize and reserve for issuance all
     additional shares of Issuer Common Stock or other securities which may be
     issued pursuant to Section 7 upon exercise of the Option. The shares of
     Issuer Common Stock to be issued upon due exercise of the Option, including
     all additional shares of Issuer Common Stock or other securities which may
     be issuable pursuant to Section 7, upon issuance pursuant hereto, shall be
     duly and validly issued, fully paid and nonassessable, and shall be
     delivered free and clear of all liens, claims, charges, and encumbrances of
     any kind or nature whatsoever, including any statutory preemptive rights of
     any stockholder of Issuer.
 
     6. Representations and Warranties of Grantee.  Grantee hereby represents
and warrants to Issuer that:
 
          (a) Grantee has all requisite corporate power and authority to enter
     into this Agreement and, subject to any approvals or consents referred to
     herein, to consummate the transactions contemplated hereby. The execution
     and delivery of this Agreement and the consummation of the transactions
     contemplated hereby have been duly authorized by all necessary corporate
     action on the part of Grantee. This Agreement has been duly executed and
     delivered by Grantee.
 
                                       C-3
<PAGE>   115
 
          (b) This Option is not being, and any Option Shares or other
     securities acquired by Grantee upon exercise of the Option will not be,
     acquired with a view to the public distribution thereof and will not be
     transferred or otherwise disposed of except in a transaction registered or
     exempt from registration under the 1933 Act.
 
     7. Adjustment upon Changes in Capitalization, etc.  (a) In the event of a
change in Issuer Common Stock by reason of a stock dividend, stock split,
split-up, recapitalization, combination, exchange of shares, or similar
transaction, the type and number of shares or securities subject to the Option,
and the Purchase Price therefor, shall be adjusted appropriately, subject to the
limitation set forth in Section 2 hereof, and proper provision shall be made in
the agreements governing such transaction so that Grantee shall receive, upon
exercise of the Option, the number and class of shares or other securities or
property that Grantee would have received in respect of Issuer Common stock if
the Option had been exercised immediately prior to such event, or the record
date therefor, as applicable. If any additional shares of Issuer Common Stock
are issued after the date of this Agreement (other than pursuant to an event
described in the first sentence of this Section 7(a) or a sale of the Issuer
Common Stock for cash at its fair market value), the number of shares of Issuer
Common Stock subject to the Option shall be adjusted so that, after such
issuance, the shares of Issuer Common Stock subject to the Option, together with
any shares of Issuer Common Stock previously issued pursuant hereto, equal 19.9%
of the number of shares of Issuer Common Stock then issued and outstanding.
 
     (b) In the event that Issuer shall enter into an agreement: (i) to
consolidate with or merge into any person, other than Grantee or one of its
subsidiaries, and shall not be the continuing or surviving corporation of such
consolidation or merger; (ii) to permit any person, other than Grantee or one of
its subsidiaries, to merge into Issuer and Issuer shall be the continuing or
surviving corporation, but, in connection with such merger, the then-outstanding
shares of Issuer Common Stock shall be changed into or exchanged for stock or
other securities of the Issuer or any other person or cash or any other property
or the outstanding shares of Issuer Common Stock immediately prior to such
merger shall after such merger represent less than 50% of the outstanding shares
and share equivalents of the merged company; or (iii) to sell or otherwise
transfer all or substantially all of its assets to any person, other than
Grantee or one of its subsidiaries, then, and in each such case, the agreement
governing such transaction shall make proper provisions so that the Option
shall, upon the consummation of any such transaction and upon the terms and
conditions set forth herein, be converted into, or exchanged for, an option (the
"Substitute Option"), at the election of Grantee, of either (x) the Acquiring
Corporation (as defined below), (y) any person that controls the Acquiring
Corporation, or (z) in the case of a merger described in clause (ii), the Issuer
(in each case, such person being referred to as the "Substitute Option Issuer").
 
     (c) The Substitute Option shall have the same terms as the Option, provided
that, if the terms of the Substitute Option cannot, for legal reasons, be the
same as the Option, such terms shall be as similar as possible and in no event
less advantageous to Grantee. The Substitute Option Issuer shall also enter into
an agreement with the then-holder or holders of the Substitute Option in
substantially the same form as this Agreement, which shall be applicable to the
Substitute Option.
 
     (d) The Substitute Option shall be exercisable for such number of shares of
the Substitute Common Stock (as hereinafter defined) as is equal to the Assigned
Value (as hereinafter defined) multiplied by the number of shares of the Issuer
Common Stock for which the Option was theretofore exercisable, divided by the
Average Price (as hereinafter defined). The exercise price of the Substitute
Option per share of the Substitute Common Stock (the "Substitute Purchase
Price") shall then be equal to the Purchase Price multiplied by a fraction in
which the numerator is the number of shares of the Issuer Common Stock for which
the Option was theretofore exercisable and the denominator is the number of
shares for which the Substitute Option is exercisable.
 
     (e) The following terms have the meanings indicated:
 
          (i) "Acquiring Corporation" shall mean (x) the continuing or surviving
     corporation of a consolidation or merger with the Issuer (if other than the
     Issuer), (y) the Issuer in a merger in which the Issuer is the continuing
     or surviving person, and (z) the transferee of all or substantially all of
     the Issuer's assets.
 
                                       C-4
<PAGE>   116
 
          (ii) "Substitute Common Stock" shall mean the common stock issued by
     the Substitute Option Issuer upon exercise of the Substitute Option.
 
          (iii) "Assigned Value" shall mean the highest of (x) the price per
     share of the Issuer Common Stock at which a Tender Offer or Exchange Offer
     therefor has been made by any person after the date hereof (other than
     Grantee), (y) the price per share of the Issuer Common Stock to be paid by
     any person (other than the Grantee) pursuant to an agreement with the
     Issuer, or (z) the highest closing sales price per share of Issuer Common
     Stock quoted on the National Association of Securities Dealers Automated
     Quotation National Market System ("NASDAQ/NMS") (or if Issuer Common Stock
     is not quoted on the NASDAQ/NMS, the highest bid price per share on any day
     as quoted on the principal trading market or securities exchange on which
     such shares are traded as reported by a recognized source chosen by Grantee
     or, if there is no such information available, the value of such shares as
     determined by a nationally recognized investment banking firm compensated
     and selected by Grantee) within the six-month period immediately preceding
     the Agreement; provided, however, that in the event of a sale of all or
     substantially all of the Issuers' assets, the Assigned Value shall be the
     sum of the price paid in such sale for such assets and the current market
     value of the remaining assets of the Issuer as determined by a nationally
     recognized investment banking firm selected by Grantee (or by a majority in
     interest of the Grantees if there shall be more than one Grantee (a
     "Grantee Majority")), divided by the number of shares of the Issuer Common
     Stock outstanding at the time of such sale.
 
          (iv) "Average Price" shall mean the average closing price of a share
     of the Substitute Common Stock for the one year immediately preceding the
     consolidation, merger or sale in question, but in no event-higher than the
     closing price of the shares of the Substitute Common Stock on the day
     preceding such consolidation, merger, or sale, provided that if Issuer is
     the issuer of the Substitute Option, the Average Price shall be computed
     with respect to a share of common stock issued by the Issuer, the person
     merging into the Issuer or by any company which controls or is controlled
     by such merger person, as Grantee may elect, and provided further that if
     there is no such trading information available, the price of such shares
     shall be determined by a nationally recognized investment banking firm
     selected by Grantee.
 
     (f) In no event pursuant to any of the foregoing paragraphs shall the
Substitute Option be exercisable for more than 19.9% of the aggregate of the
shares of the Substitute Common Stock outstanding prior to exercise of the
Substitute Option. In the event that the Substitute Option would be exercisable
for more than 19.9% of the aggregate of the shares of Substitute Common Stock
but for this clause (f), the Substitute Option Issuer shall make a cash payment
to Grantee equal to the excess of (i) the value of the Substitute Option without
giving effect to the limitation in this clause (f) over (ii) the value of the
Substitute Option after giving effect to the limitation in this clause (f). This
difference in value shall be determined by a nationally recognized investment
banking firm selected by Grantee (or a Grantee Majority).
 
     (g) Issuer shall not enter into any transaction described in subsection (b)
of this Section 7 unless the Acquiring Corporation and any person that controls
the Acquiring Corporation assumes in writing all the obligations of Issuer
hereunder and takes all other actions that may be necessary so that the
provisions of this Section 7 are given full force and effect (including, without
limitation, any action that may be necessary so that the shares of Substitute
Common Stock are in no way distinguishable from or have lesser economic value
than other shares of common stock issued by the Substitute Option Issuer) (other
than any diminution in value resulting from the fact that the shares of
Substitute Common Stock are restricted securities as defined in Rule 144 under
the 1933 Act or any successor provision).
 
     (h) The provisions of Sections 8, 9, and 10 shall apply, with appropriate
adjustments, to any securities for which the Option becomes exercisable pursuant
to this Section 7 and, as applicable, references in such sections to "Issuer,"
"Option," "Purchase Price," and "Issuer Common Stock" shall be deemed to be
references to "Substitute Option Issuer," "Substitute Option," "Substitute
Purchase Price," and "Substitute Common Stock," respectively.
 
     8. Repurchase at the Option of Grantee.  (a) Subject to the last sentence
of Section 3(a), at the request of Grantee at any time commencing upon the first
occurrence of a Repurchase Event (as defined in Section 8(d)) and ending 30 days
immediately thereafter, Issuer shall, to the extent permitted by applicable
                                       C-5
<PAGE>   117
 
law, repurchase from Grantee the Option and all shares of Issuer Common Stock
purchased by Grantee pursuant hereto with respect to which Grantee then has
beneficial ownership. The date on which Grantee exercises its right under this
Section 8 is referred to as the "Request Date". Such repurchase shall be at an
aggregate price (the "Section 8 Repurchase Consideration") equal to the sum of:
 
          (i) the aggregate Purchase Price paid by Grantee for any shares of
     Issuer Common Stock acquired pursuant to the Option with respect to which
     Grantee then has beneficial ownership;
 
          (ii) The excess, if any, of (x) the Applicable Price (as defined
     below) for each share of Issuer Common Stock over (y) the Purchase Price
     (subject to adjustment pursuant to Section 7), multiplied by the number of
     shares of Issuer Common Stock with respect to which the Option has not been
     exercised; and
 
          (iii) the excess, if any, of the Applicable Price over the Purchase
     Price (subject to adjustment pursuant to Section 7) paid (or, in the case
     of Option Shares with respect to which the Option has been exercised but
     the Closing Date has not occurred, payable) by Grantee for each share of
     Issuer Common Stock with respect to which the Option has been exercised and
     with respect to which Grantee then has beneficial ownership, multiplied by
     the number of such shares.
 
     (b) If Grantee exercises its right under this Section 8, Issuer shall, to
the extent permitted by applicable law, within 10 business days after the
Request Date, pay the Section 8 Repurchase Consideration to Grantee in
immediately available funds, and contemporaneously with such payment Grantee
shall surrender to Issuer the Option and the certificates evidencing the shares
of Issuer Common Stock purchased thereunder with respect to which Grantee then
has beneficial ownership, and Grantee shall warrant that it has sole record and
beneficial ownership of such shares and that the same are then free and clear of
all liens, claims, charges, and encumbrances of any kind whatsoever.
Notwithstanding the foregoing, to the extent that prior notification to or
approval of the Board of Governors of the Federal Reserve System or other
regulatory authority is required in connection with the payment of all or any
portion of the Section 8 Repurchase Consideration, Grantee shall have the
ongoing option to revoke its request for repurchase pursuant to this Section 8,
in whole or in part, or to require that Issuer deliver from time to time that
portion of the Section 8 Repurchase Consideration that it is not then so
prohibited from paying and promptly file the required notice or application for
approval and expeditiously process the same (and each party shall cooperate with
the other in the filing of any such notice or application and the obtaining of
any such approval). If the Board of Governors of the Federal Reserve System or
any other regulatory authority disapproves of any part of Issuer's proposed
repurchase pursuant to this Section 8, Issuer shall promptly give notice of such
fact to Grantee. If the Board of Governors of the Federal Reserve System or
other agency prohibits the repurchase in part but not in whole, then Grantee
shall have the right (i) to revoke the repurchase request, or (ii) to the extent
permitted by the Board of Governors of the Federal Reserve System or other
agency, determine whether the repurchase should apply to the Option and/or
Option Shares and to what extent to each, and Grantee shall thereupon have the
right to exercise the Option as to the number of Options Shares for which the
Option was exercisable at the Request Date less the sum of the number of shares
covered by the Option in respect of which payment has been made pursuant to
Section 8(a)(ii) and the number of shares covered by the portion of the Option
(if any) that has been repurchased. Grantee shall notify Issuer of its
determination under the preceding sentence within five (5) days of receipt of
notice of disapproval of the repurchase.
 
     Notwithstanding anything herein to the contrary, all of the Grantee's
rights under this Section 8 shall terminate on the date of termination of this
Option pursuant to Section 3(a).
 
     (c) For purposes of this Agreement, the "Applicable Price" means the
highest of (i) the highest price per share of Issuer Common Stock paid for any
such share by the person or groups described in Section 8(d)(i); (ii) the price
per share of Issuer Common Stock received by holders of Issuer Common Stock in
connection with any merger or other business combination transaction described
in Section 7(b)(i), 7(b)(ii) or 7(b)(iii); or (iii) the highest closing sales
per share of Issuer Common Stock quoted on the NASDAQ/NMS (or if Issuer Common
Stock is not quoted on the market or securities exchange on which such shares
are traded as reported by a recognized source chosen by Grantee and reasonably
acceptable to Issuer) during the 60 business days preceding the Request Date;
provided, however, that in the event of a sale of less than all of Issuer's
assets, the Applicable Price shall be the sum of the price paid in such sale for
such
 
                                       C-6
<PAGE>   118
 
assets and the current market value of the remaining assets of Issuer as
determined by a nationally recognized investment banking firm selected by
Grantee, divided by the number of shares of the Issuer Common Stock outstanding
at the time of such sale. If the consideration to be offered, paid or received
pursuant to either of the foregoing clauses (i) or (ii) shall be other than in
cash, the value of such consideration shall be determined in good faith by an
independent nationally recognized investment banking firm selected by Grantee
and reasonably acceptable to Issuer, which determination shall be conclusive for
all purposes of the Agreement.
 
     (d) As used herein, "Repurchase Event" shall occur if (i) any person (other
than Grantee or any subsidiary of Grantee) shall have acquired beneficial
ownership of (as such term is defined in Rule 13d-3 promulgated under the 1934
Act), or the right to acquire beneficial ownership of, or any "group" (as such
term is defined under the 1934 Act) shall have been formed which beneficially
owns or has the right the acquire beneficial ownership of, 50% or more of the
then outstanding shares of Issuer Common Stock, or (ii) any of the transactions
described in Section 7(b)(i), 7(b)(ii), or 7(b)(iii) shall be consummated.
 
     (e) In connection with the application of the provisions of this Section 8,
Grantee acknowledges that Issuer's ability to fund the Section 8 Repurchase
Consideration in accordance with the provisions of this Section 8 may be
dependant upon the ability of Issuer to obtain the prior approval of the Board
of Governors of the Federal Reserve System and applicable provisions of Nevada
law and that, unless there has been an agreement of the type described in
Section 7(b), Issuer's obligations under this Section 8 do not impose on the
Issuer an obligation to otherwise finance the payment of the Section 8
Repurchase Consideration through the incurrence of indebtedness or the issuance
of capital instruments or securities by Issuer in either case sufficient in
amount to satisfy the payment of the Section 8 Repurchase Consideration.
Accordingly, Issuer shall not be deemed to be in breach of this Section 8 if,
after making its best efforts to obtain regulatory authorization for a capital
distribution required to pay the Section 8 Repurchase Consideration, it is
unable to do so.
 
     9. Quotation: Listing.  If the Issuer Common Stock or any other securities
to be acquired upon exercise of the Option are then authorized for quotation or
trading or listing on the NASDAQ/NMS or any securities exchange, Issuer, upon
the request of Grantee, will promptly file an application, if required, to
authorize for quotation or trading or listing shares of Issuer Common Stock or
other securities to be acquired upon exercise of the Option on the NASDAQ/NMS or
such other securities exchange and will use its best efforts to obtain approval,
if required, of such quotation or listing as soon as practicable.
 
     10. Division of Option.  This Agreement (and the Option granted hereby) are
exchangeable, without expense, at the Option of the Grantee, upon presentation
and surrender of this Agreement at the principal office of Issuer for other
Agreements providing for Options of different denominations entitling the holder
thereof to purchase in the aggregate the same number of shares of Issuer Common
Stock purchasable hereunder. The terms "Agreement" and "Option" as used herein
include any other Agreements and related Options for which this Agreement (and
the Option granted hereby) may be exchanged. Upon receipt by Issuer of evidence
reasonably satisfactory to it of the loss, theft, destruction, or mutilation of
this Agreement, and (in the case of loss, theft, or destruction) of reasonably
satisfactory indemnification, and upon surrender and cancellation of this
Agreement, if mutilated, Issuer will execute and deliver a new Agreement of like
tenor and date. Any such new Agreement executed and delivered shall constitute
an additional contractual obligation on the part of the Issuer, whether or not
the Agreement so lost, stolen, destroyed or mutilated shall at any time be
enforceable by anyone.
 
     11. Miscellaneous.  (a) Expenses.  Each of the parties hereto shall bear
and pay all costs and expenses incurred by it or on its behalf in connection
with the transactions contemplated hereunder, including fees and expenses of its
own financial consultants, investment bankers, accountants and counsel.
 
     (b) Waiver and Amendments.  Any provision of this Agreement may be waived
at any time in writing by the party that is entitled to the benefits of such
provision. This Agreement may not be modified, amended, altered, or supplemented
except upon the execution and delivery of a written agreement executed by the
parties hereto.
 
                                       C-7
<PAGE>   119
 
     (c) Entire Agreement: No Third-Party Beneficiary: Severability.  This
Agreement, together with the Merger Agreement and the other documents and
instruments referred to herein and therein, between Grantee and Issuer (a)
constitutes the entire agreement and supersedes all prior agreements and
understandings, both written and oral, between the parties with respect to the
subject matter hereof and (b) is not intended to confer upon any person other
than the parties hereto (other than any transferee of the Option Shares or any
permitted transferee of this Agreement pursuant to Section 11(h)) any rights or
remedies hereunder. If any terms, provision, covenant, or restriction of this
Agreement is held by a court of competent jurisdiction or a federal or state
regulatory agency to be invalid, void or unenforceable, the remainder of the
terms, provisions, covenants, and restrictions of this Agreement shall remain in
full force and effect and shall in no way be affected, impaired, or invalidated.
If for any reason such court or regulatory agency determines that the Option
does not permit Grantee to Acquire, or does not require Issuer to repurchase,
the full number of shares of Issuer Common Stock as provided in Sections 3 and 8
(as adjusted pursuant to Section 7), it is the express intention of Issuer to
allow Grantee to Acquire or to require Issuer to repurchase such lesser number
of shares as may be permissible without any amendment or modification hereof.
 
     (d) Governing Law.  This Agreement shall be governed and construed in
accordance with the laws of the State of Alabama without regard to any
applicable conflicts of law rules.
 
     (e) Descriptive Headings.  The description headings contained herein are
for convenience of reference only and shall not affect in any way the meaning or
interpretation of this Agreement.
 
     (f) Notices.  All notices and other communications hereunder shall be in
writing and shall be deemed given if delivered personally, telecopied (with
confirmation), or mailed by registered or certified mail (return receipt
requested) to the parties at the following addresses (or at such other address
for a party as shall be specified by like notice):
 
If to Issuer to:       InterWest Bancorp
                       2330 South Virginia Street
                       Reno, Nevada 89502
                       Telecopy Number: (702) 827-7267
 
                       Attention:  Richard Martucci
                                 President and CEO
 
with a copy to:        Lyle & Murphy, L.L.P.
                       245 East Liberty Street, 3rd Floor
                       Reno, Nevada 89515
                       Telecopy Number: (702) 348-5000
 
                       Attention:  Marvin W. Murphy
 
If to Grantee to:      The Colonial BancGroup, Inc.
                       P.O. Box 1108
                       Montgomery, Alabama 36101
                       Telecopy Number: (334) 240-5069
 
                       Attention:  W. Flake Oakley, IV
                                 Chief Financial Officer
 
with a copy to:        William A. McCrary
                       Vice President & Legal Counsel
                       One Commerce Street
                       Montgomery, Alabama 36104
                       Telecopy Number: (334) 240-5315
 
                                       C-8
<PAGE>   120
 
     (g) Counterparts.  This Agreement and all amendments hereto may be executed
in two counterparts, each of which shall be considered one and the same
agreement and shall become effective when both counterparts have been signed, it
being understood that both parties need not sign the same counterpart.
 
     (h) Assignment.  Neither this Agreement nor any of the rights, interests,
or obligations hereunder or under the Option shall be assigned by any of the
parties hereto (whether by operation of law or otherwise) without the prior
written consent of the other party, except that Grantee may assign this
Agreement to a wholly owned subsidiary of Grantee. Subject to the preceding
sentence, this Agreement shall be binding upon, inure to the benefit of and be
enforceable by the parties and their respective successors and assigns.
 
     (i) Further Assurances.  In the event of any exercise of the Option by
Grantee, Issuer and Grantee shall execute and deliver all other documents and
instruments and take all other action that may be reasonably necessary in order
to consummate the transactions provided for by such exercise.
 
     (j) Specific Performance.  The parties hereto agree that this Agreement may
be enforced by either party through specific performance, injunctive relief, and
other equitable relief. Both parties further agree to waive any requirement for
the securing or posting of any bond in connection with the obtaining of any such
equitable relief and that this provision is without prejudice to any other
rights that the parties hereto may have for any failure to perform this
Agreement.
 
     IN WITNESS WHEREOF, Issuer and Grantee have caused this agreement to be
signed by their respective officers thereunto duly authorized, all as of the day
and year first written above.
 
<TABLE>
<S>                                                    <C>
 
ATTEST:                                                INTERWEST BANCORP
 
By:                                                    By:
  -------------------------------------------------      -------------------------------------------------
                      Secretary                                          Richard Martucci
                                                                         President and CEO
 
[CORPORATE SEAL]
 
ATTEST:                                                THE COLONIAL BANCGROUP, INC.
 
By:                                                    By:
  -------------------------------------------------      -------------------------------------------------
                 Assistant Secretary                                    W. Flake Oakley, IV
                                                                      Chief Financial Officer
 
[CORPORATE SEAL]
</TABLE>
 
                                       C-9
<PAGE>   121

                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 20.       INDEMNIFICATION OF DIRECTORS AND OFFICERS.

        Pursuant to section 145 of the Delaware General Corporation Law, as
amended, and the Restated Certificate of Incorporation of the Registrant,
officers, directors, employees, and agents of the Registrant are entitled to
indemnification against liabilities incurred while acting in such capacities on
behalf of the Registrant, including reimbursement of certain expenses. In
addition, the Registrant maintains an officers and directors insurance policy
pursuant to which certain officers and all directors of the Registrant are
entitled to indemnification against certain liabilities, including reimbursement
of certain expenses, and the Registrant has indemnity agreements
("Indemnification Agreements") with certain officers and all of its directors
pursuant to which such persons may be indemnified by the Registrant against
certain liabilities, including expenses.

        The Indemnification Agreements are intended to provide additional
indemnification to directors and officers of BancGroup beyond the specific
provisions of the Delaware General Corporation Law. Under the Delaware General
Corporation Law, a company may indemnify its directors and officers in
circumstances other than those under which indemnification and the advance of
expenses are expressly permitted by applicable statutory provisions.

        Under the Delaware General Corporation Law, a director, officer,
employee or agent of a corporation (i) must be indemnified by the corporation
for all expenses incurred by him (including attorneys' fees) when he is
successful on the merits or otherwise in defense of any action, suit or
proceeding brought by reason of the fact that he is or was a director, officer,
employee or agent of the corporation, (ii) may be indemnified by the corporation
against expenses (including attorneys' fees), judgments, fines and amounts paid
in settlement of any such proceeding (other than a proceeding by or in the right
of the corporation) even if he is not successful on the merits if he acted in
good faith and in a manner he reasonably believed to be in or not opposed to the
best interest of the corporation (and, in the case of a criminal proceeding, had
no reasonable cause to believe his conduct was unlawful), and (iii) may be
indemnified by the corporation for expenses (including attorneys' fees) incurred
by him in the defense or settlement of a proceeding brought by or in the right
of the corporation, if he acted in good faith and in a manner he reasonably
believed to be in or not opposed to the best interests of the corporation;
provided that no indemnification may be made under the circumstances described
in clause (iii) if the director, officer, employee or agent is adjudged liable
to the corporation, unless a court determines that, despite the adjudication of
liability but in view of all of the circumstances, he is fairly and reasonably
entitled to indemnification for the expenses which the court shall deem proper.
The indemnification described in clauses (ii) and (iii) above (unless ordered by
a court) may be made only as authorized in a specific case upon determination by
(i) a majority of a quorum of disinterested directors, (ii) independent legal
counsel in a written opinion, or (iii) the stock holders, that indemnification
is proper in the circumstances because the applicable standard of conduct has
been met. Expenses (including attorneys' fees) incurred by an officer or
director in defending a proceeding may be advanced by the corporation prior to
the final disposition of the proceeding upon receipt of an undertaking by or on
behalf of the director or officer to repay the advance if it is ultimately
determined that he is not entitled to be 


<PAGE>   122


indemnified by the corporation. Expenses (including attorneys' fees) incurred by
other employees and agents may be advanced by the corporation upon terms and
conditions deemed appropriate by the board of directors.

        The indemnification provided by the Delaware General Corporation Law has
at least two limitations that are addressed by the Indemnification Agreements:
(i) BancGroup is under no obligation to advance expenses to a director or
officer, and (ii) except in the case of a proceeding in which a director or
officer is successful on the merits or otherwise, indemnification of a director
or officer is discretionary rather than mandatory.

        The Indemnification Agreements, therefore, cover any and all expenses
(including attorneys' fees and all other charges paid or payable in connection
therewith) incurred in connection with investigating, defending, being a witness
or participating in (including an appeal), or preparing to defend, be a witness
in or participate in, any threatened, pending or completed action, suit or
proceeding, or any inquiry or investigation, whether civil, criminal,
administrative or otherwise, related to the fact that such director or officer
is or was a director, officer, employee or agent of BancGroup or is or was
serving at the request of BancGroup as a director, officer, employee, agent,
partner, committee member or fiduciary of another corporation, partnership,
joint venture, employee benefit plan, trust or other enterprise, or by reason of
anything done or not done by such director or officer in any such capacity.

        The Indemnification Agreements also provide for the prompt advancement
of all expenses incurred in connection with any proceeding and obligate the
director or officer to reimburse BancGroup for all amounts so advanced if it is
subsequently determined, as provided in the Indemnification Agreements, that the
director or officer is not entitled to indemnification.

        The Indemnification Agreements further provide that the director or
officer is entitled to indemnification for, and advancement of, all expenses
(including attorneys' fees) incurred in any proceeding seeking to collect from
BancGroup an indemnity claim or advancement of expenses under the
Indemnification Agreements, BancGroup's Certificate of Incorporation, or the
Delaware General Corporation Law, regardless of whether the director or officer
is successful in such proceeding.

        The Indemnification Agreements impose upon BancGroup the burden of
proving that the director or officer is not entitled to indemnification in any
particular case, and the Indemnification Agreements negate certain presumptions
which might otherwise be drawn against a director or officer in certain
circumstances. Further, the Indemnification Agreements provide that if BancGroup
pays a director or officer pursuant to an Indemnification Agreement, BancGroup
will be subrogated to such director's or officer's rights to recover from third
parties.

        The Indemnification Agreements stipulate that a director's or officer's
rights under such contracts are not exclusive of any other indemnity rights a
director or officer may have; however, the Indemnification Agreements prevent
double payment. The Indemnification Agreements require the maintenance of
directors' and officers' liability insurance if such insurance can be maintained
on terms, including rates, satisfactory to BancGroup.


                                      II-2
<PAGE>   123

        The benefits of the Indemnification Agreements would not be available if
(i) the action with respect to which indemnification is sought was initiated or
brought voluntarily by the officer or director (other than an action to enforce
the right to indemnification under the Indemnification Agreements); (ii) the
officer or director is paid for such expense or liability under an insurance
policy; (iii) the proceeding is for an accounting of profits pursuant to Section
16(b) of the Securities Exchange Act of 1934, as amended; (iv) the conduct of
the officer or director is adjudged as constituting an unlawful personal
benefit, or active or deliberate dishonesty or willful fraud or illegality; or
(v) a court determines that indemnification or advancement of expenses is
unlawful under the circumstances.

        The Indemnification Agreements would provide indemnification for
liabilities arising under the Securities Act of 1933, as amended. BancGroup has
been advised that in the opinion of the Securities and Exchange Commission such
indemnification is against public policy as expressed in such act and is,
therefore, unenforceable.

ITEM 21.       EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.

        (a)    The following is a list of exhibits that are included in Part II
               of the Registration Statement. Such exhibits are separately
               indexed elsewhere in the Registration Statement.

                                   DESCRIPTION

Exhibit 2      Plan of acquisition, reorganization, arrangement, liquidation of
               successor:

        2.1    Agreement and Plan of Merger by and between The Colonial
               BancGroup, Inc. and InterWest Bancorp, dated as of June 16, 1998,
               included in the Prospectus portion of this Registration Statement
               at Appendix A and incorporated herein by reference.

        2.2    Stock Option Agreement by and between The Colonial BancGroup,
               Inc. and InterWest Bancorp, dated as of June 16, 1998, included
               in the Prospectus portion of this Registration Statement at
               Appendix C and incorporated herein by reference.

Exhibit 4      Instruments defining the rights of security holders:

        4.1    Article 4 of the Restated Certificate of Incorporation of the
               Registrant filed as Exhibit 4.1 to the Registrant's Current
               Report on Form 8-K, dated February 21, 1995, and incorporated
               herein by reference.

        4.2    Amendment to Article 4 of Registrant's Restated Certificate of
               Incorporation, dated May 15, 1998, filed as Exhibit 4.2 to the
               Registrant's Registration Statement on Form S-4 (File No.
               333-56241) effective June 22, 1998, and incorporated herein by
               reference.

        4.3    Article II of the Bylaws of the Registrant filed as Exhibit 4.2
               to the 


                                      II-3
<PAGE>   124

               Registrant's Current Report on Form 8-K, dated February 21, 1995,
               and incorporated herein by reference.

        4.4    Dividend Reinvestment and Class A Common Stock Purchase Plan of
               the Registrant dated January 15, 1986, and Amendment No. 1
               thereto dated as of June 10, 1986, filed as Exhibit 4(C) to the
               Registrant's Registration Statement on Form S-4 (File No.
               33-07015), effective July 15, 1986, and incorporated herein by
               reference.

        4.5    Trust Indenture dated as of March 25, 1986, included as Exhibit 4
               to the Registrant's Amendment No. 1 to Registration Statement on
               Form S-2, file number 33-4004, effective March 25, 1986, and
               incorporated herein by reference.

        4.6    All other instruments defining the rights of holders of long-term
               debt of the Registrant and its subsidiaries - not filed pursuant
               to clause 4(iii) of Item 601(b) of Regulation S-K, to be
               furnished upon request of the Commission.

Exhibit 5      Opinion of Miller, Hamilton, Snider & Odom, L.L.C. as to
               certain Delaware law issues of the securities being registered.

Exhibit 8      Tax Opinion of PricewaterhouseCoopers LLP

Exhibit 23     Consents of experts and counsel:

        23.1   Consents of PricewaterhouseCoopers LLP

        23.2   Consent of Kafoury, Armstrong & Co.

        23.3   Consent of Miller, Hamilton, Snider & Odom, L.L.C.

        23.4   Consent of TASG, Inc.

Exhibit 24     Power of Attorney

Exhibit 99     Additional exhibits:

        99.1   Form of Proxy of InterWest Bancorp

        (b)    Financial Statement Schedules

               The financial statement schedules required to be included
               pursuant to this Item are not included herein because they are
               not applicable or the required information is shown in the
               financial statements or notes thereto.


                                      II-4
<PAGE>   125

ITEM 22.       UNDERTAKINGS.

        (a)    The undersigned hereby undertakes as follows as required by Item
               512 of Regulation S-K:

               (1)    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), 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.

               (2)    That every prospectus (i) that is filed pursuant to
                      paragraph (1) immediately above, 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 such
                      securities offered therein, and the offering of such
                      securities at that time shall be deemed to be the initial
                      bona fide offering thereof.

               (3)    Insofar as indemnification for liabilities arising under
                      the Act may be permitted to directors, officers, and
                      controlling persons of the Registrant, 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.

        (b)    The undersigned Registrant hereby undertakes to respond to
               requests for information that is incorporated by reference into
               the prospectus pursuant to Items 4, 10(b), 11, or 13 of Form S-4,
               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 


                                      II-5
<PAGE>   126

               of the Registration Statement through the date of responding to
               the request.

        (c)    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.

        (d)    The undersigned Registrant hereby undertakes:

               (1)    To file, during any period in which offers or sales are
                      being made, a post-effective amendment to this
                      Registration Statement:

                      (i)    To include any prospectus required by section
                             10(a)(3) of the Securities Act of 1933;

                      (ii)   To reflect in the prospectus any facts or events
                             arising after the effective date of the
                             Registration Statement (or the most recent
                             post-effective amendment thereof) which,
                             individually or in the aggregate, represent a
                             fundamental change in the information set forth in
                             the Registration Statement;

                      (iii)  To include any material information with respect to
                             the plan of distribution not previously disclosed
                             in the Registration Statement or any material
                             change to such information in the Registration
                             Statement;

               (2)    That, for the purpose of determining any liability under
                      the Securities Act of 1933, each such post-effective
                      amendment shall be deemed to be a new registration
                      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.

               (3)    To remove from registration by means of a post-effective
                      amendment any of the securities being registered which
                      remain unsold at the termination of the offering.

        (e)    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 section 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.


                                      II-6
<PAGE>   127



                                   SIGNATURES

        Pursuant to the requirements of the Securities Act of 1933, the
Registrant has duly caused this registration statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of Montgomery,
Alabama, on the 19th day of August, 1998.


                                            THE COLONIAL BANCGROUP, INC.



                                            By:  /s/ Robert E. Lowder
                                               --------------------------------
                                                   Robert E. Lowder
                                                   Its Chairman of the Board
                                                   of Directors and Chief
                                                   Executive Officer

        Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed below by the following persons in the
capacities and on the dates indicated.

<TABLE>
<CAPTION>

SIGNATURES                                  TITLE                              DATE
- ----------                                  -----                              ----

<S>                                         <C>                                <C>
/s/ Robert E. Lowder                        Chairman of the Board              **
- ---------------------------                 of Directors and Chief
Robert E. Lowder                            Executive Officer                         


/s/ W. Flake Oakley, IV                     Chief Financial                    **
- ---------------------------                 Officer, Secretary      
W. Flake Oakley, IV                         and Treasurer (Principal
                                            Financial Officer and   
                                            Principal Accounting    
                                            Officer)

        *                                   Director                           **
- ----------------------------
Lewis Beville


        *                                   Director                           **
- ----------------------------
William Britton
</TABLE>



                                      II-7
<PAGE>   128

<TABLE>

<S>                                         <C>                                <C>
        *                                   Director                           **
- ----------------------------
Jerry J. Chesser


        *                                   Director                           **
- ----------------------------
Augustus K. Clements, III


        *                                   Director                           **
- ----------------------------
Robert C. Craft


        *                                   Director                           **
- ----------------------------
Patrick F. Dye


        *                                   Director                           **
- ----------------------------
James Hewitt


        *                                   Director                           **
- ----------------------------
Clinton O. Holdbrooks


        *                                   Director                           **
- ----------------------------
D. B. Jones


        *                                   Director                           **
- ----------------------------
Harold D. King


        *                                   Director                           **
- ----------------------------
John Ed Mathison
</TABLE>


                                      II-8
<PAGE>   129

<TABLE>

<S>                                         <C>                                <C>
        *                                   Director                           **
- ----------------------------
Milton E. McGregor


        *                                   Director                           **
- ----------------------------
John C. H. Miller, Jr.


        *                                   Director                           **
- ----------------------------
Joe D. Mussafer


        *                                   Director                           **
- ----------------------------
William E. Powell


        *                                   Director                           **
- ----------------------------
J. Donald Prewitt


        *                                   Director                           **
- ----------------------------
Jack H. Rainer


        *                                   Director                           **
- ----------------------------
Jimmy Rane


        *                                   Director                           **
- ----------------------------
Frances E. Roper


        *                                   Director                           **
- ----------------------------
Simuel Sippial


        *                                   Director                           **
- ----------------------------
Ed V. Welch
</TABLE>



                                      II-9
<PAGE>   130

*       The undersigned, acting pursuant to a power of attorney, has signed this
        Registration Statement on Form S-4 for and on behalf of the persons
        indicated above as such persons' true and lawful attorney-in-fact and in
        their names, places and stead, in the capacities indicated above and on
        the date indicated below.


/s/ W. Flake Oakley, IV
- ------------------------------
W. Flake Oakley, IV
Attorney-in-Fact

**  Dated: August 19, 1998





























                                     II-10
<PAGE>   131



                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549




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





                                   EXHIBITS TO

                                    FORM S-4


                             REGISTRATION STATEMENT

                                      UNDER

                           THE SECURITIES ACT OF 1933





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






                          THE COLONIAL BANCGROUP, INC.

             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)


                                  EXHIBIT INDEX


                                     II-11
<PAGE>   132

<TABLE>
<CAPTION>

EXHIBIT                                                                              PAGE
- -------                                                                              ----
<S>            <C>                                                                   <C>
Exhibit 2      Plan of acquisition, reorganization, arrangement, liquidation
               of successor:

        2.1    Agreement and Plan of Merger by and between The Colonial
               BancGroup, Inc. and InterWest Bancorp, dated as of June 16, 1998,
               included in the Prospectus portion of this Registration Statement
               at Appendix A and incorporated herein by reference.

        2.2    Stock Option Agreement by and between The Colonial BancGroup,
               Inc. and InterWest Bancorp, dated as of June 16, 1998, included
               in the Prospectus portion of this Registration Statement at
               Appendix C and incorporated herein by reference.

Exhibit 4      Instruments defining the rights of security holders:

        4.1    Article 4 of the Restated Certificate of Incorporation of the
               Registrant filed as Exhibit 4.1 to the Registrant's Current
               Report on Form 8-K, dated February 21, 1995, including the
               amendment to Article 4 noted at Exhibit 4(B) above, and
               incorporated herein by reference.

        4.2    Amendment to Article 4 of Registrant's Restated Certificate of
               Incorporation, dated May 15, 1998, filed as Exhibit 4.2 to the
               Registrant's Registration Statement on Form S-4 (File No.
               333-56241) effective June 22, 1998, and incorporated herein by
               reference.

        4.3    Article II of the Bylaws of the Registrant filed as Exhibit 4.2
               to the Registrant's Current Report on Form 8-K, dated February
               21, 1995, and incorporated herein by reference.

        4.4    Dividend Reinvestment and Class A Common Stock Purchase Plan of
               the Registrant dated January 15, 1986, and Amendment No. 1
               thereto dated as of June 10, 1986, filed as Exhibit 4(C) to the
               Registrant's Registration Statement on Form S-4 (File No.
               33-07015), effective July 15, 1986, and incorporated herein by
               reference.

        4.5    Trust Indenture dated as of March 25, 1986, included as Exhibit 4
               to the Registrant's Amendment No. 1 to Registration Statement on
               Form S-2, file number 33-4004, effective March 25, 1986, and
               incorporated herein by reference.

        4.6    All other instruments defining the rights of holders of long-term
               debt of the Registrant and its subsidiaries - not filed pursuant
               to clause 4(iii) of Item 601(b) of Regulation S-K to be furnished
               upon request of the Commission.
</TABLE>


                                     II-12
<PAGE>   133

<TABLE>

<S>            <C>                                                                   <C>
Exhibit 5      Opinion of Miller, Hamilton, Snider & Odom, L.L.C. as to
               certain Delaware law issues of the securities being registered.

Exhibit 8      Tax Opinion of PricewaterhouseCoopers LLP

Exhibit 23     Consents of experts and counsel:

        23.1   Consents of PricewaterhouseCoopers LLP

        23.2   Consent of Kafoury, Armstrong & Co.

        23.3   Consent of Miller, Hamilton, Snider & Odom, L.L.C.

        23.4   Consent of TASG, Inc.

Exhibit 24     Power of Attorney

Exhibit 99     Additional exhibits:

        99.1   Form of Proxy of InterWest Bancorp
</TABLE>





















                                     II-13

<PAGE>   1


                                                                       EXHIBIT 5



           OPINION AS TO CERTAIN DELAWARE LAW ISSUES OF THE SECURITIES
                                BEING REGISTERED


<PAGE>   2



                                August 18, 1998

                                                               Montgomery Office

The Colonial BancGroup, Inc.
P. O. Box 1108
Montgomery, AL  36101

        Re:    Registration Statement on Form S-4 relating to the issuance of
               shares of Common Stock of The Colonial BancGroup, Inc., in
               connection with the acquisition by merger of InterWest Bancorp
               (the "Merger")

Gentlemen:

        We are familiar with the proceedings taken and proposed to be taken by
The Colonial BancGroup, Inc., a Delaware corporation (the "Company"), in
connection with the proposed issuance by the Company of shares of its Common
Stock, par value of $2.50 per share, in connection with the Merger and in
accordance with an Agreement and Plan of Merger, dated as of June 16, 1998 (the
"Agreement"), by and between the Company and InterWest Bancorp. We have also
acted as counsel for the Company in connection with the preparation and filing
with the Securities and Exchange Commission under the Securities Act of 1933, of
the Registration Statement on Form S-4 referred to in the caption above. In this
connection we have reviewed such documents and matters of law as we have deemed
relevant and necessary as a basis for the opinions expressed herein.

        Upon the basis of the foregoing, we are of the opinion that:

        (i) The Company is a corporation duly organized and existing under the
laws of the State of Delaware;

        (ii) The shares of Common Stock of the Company referred to above, to the
extent actually 

<PAGE>   3

The Colonial BancGroup
August 18, 1998
Page 2


issued pursuant to the Agreement will, when so issued, be duly and validly
authorized and issued and will be fully paid and nonassessable shares of Common
Stock of the Company;

        (iii) Under the laws of the State of Delaware, no personal liability
attaches to the ownership of the shares of Common Stock of the Company.

        We hereby consent to the filing of this opinion as an exhibit to the
above-referenced registration statement. In consenting to the inclusion of our
opinion in the Registration Statement, we do not thereby admit that we are a
person whose consent is required pursuant to Section 7 of the Securities Act of
1933, as amended.

                                    Sincerely yours,

                                    MILLER, HAMILTON, SNIDER & ODOM, L.L.C.




                                    /s/ Miller, Hamilton, Snider & Odom, L.L.C.

WHH/jvb



<PAGE>   1



                                                                       EXHIBIT 8


                                   Tax Opinion


<PAGE>   2

(PRICEWATERHOUSECOOPERS LETTERHEAD AND LOGO)


August 14, 1998

Mr. Flake Oakley
Chief Financial Officer
Colonial BancGroup, Inc.
P.O. Box 1109
Montgomery, AL  36101

Dear Mr. Oakley:

For various business reasons, InterWest Bancorp (Acquired Corporation) and The
Colonial BancGroup, Inc. (BancGroup) have entered into an Agreement and Plan of
Merger (Agreement) on June 16, 1998. Pursuant to your request, our letter
addresses the federal income tax consequences of the proposed transaction as
outlined below. We will address whether the merger will qualify as
reorganization within the meaning of Section 368(a) of the Internal Revenue Code
of 1986 (I.R.C.). We will also address additional federal income tax
consequences to Acquired Corporation, BancGroup, and shareholders. This letter
is not a comprehensive analysis of the income tax consequences to Acquired
Corporation shareholders. Acquired Corporation shareholders should consult their
own tax advisors regarding the income tax consequences of the merger.

BACKGROUND

Acquired Corporation operates as a bank holding company for its 86.11% owned
subsidiary, InterWest Bank (Bank) and its wholly owned subsidiary InterWest
Mortgage (Mortgage Company). BancGroup, a Delaware corporation, is a bank
holding company with a wholly owned subsidiary, Colonial Bank. Colonial Bank
currently operates in Alabama, Florida, Georgia, Nevada, Tennessee, and Texas.

CERTAIN TERMS OF THE MERGER

At the effective date of the merger, Acquired Corporation will merge with and
into BancGroup, with BancGroup as the surviving corporation. Pursuant to the
terms of the transaction, each share of common stock of Acquired Corporation
outstanding and held by Acquired Corporation's shareholders other than shares
held by shareholders who perfect their dissenter's rights, will be converted by
operation of law and without any action on the part of the parties or the
holders thereof into 0.2357 shares of BancGroup common stock as provided in the
Agreement.

The holders of Acquired Corporation options may provide written notice, no later
than five days prior to the effective date of the merger, to Acquired
Corporation that they wish to surrender their Acquired Corporation options to
BancGroup in exchange for BancGroup common stock. The amount of BancGroup common
stock issued in exchange for Acquired Corporation options will be equal to the
difference between the total value of the shares of BancGroup common stock to be
issued pursuant to 

<PAGE>   3


such Acquired Corporation options less the aggregate exercise price of such
Acquired Corporation options divided by the market value.

No fractional shares of BancGroup common stock will be issued. Instead, each
holder of shares of Acquired Corporation stock having a fractional interest
arising upon the conversion of such shares into shares of BancGroup common stock
shall, at the time of surrender of the certificates previously representing
Acquired Corporation stock, be paid by BancGroup an amount in cash. Any
shareholder of Acquired Corporation who does not vote in favor of the Agreement
and who complies with certain procedures relating to the rights of dissenting
shareholders will be entitled to receive payment for the fair value of his or
her Acquired Corporation stock.

Prior to the effective date of the merger, Acquired Corporation will have
redeemed or purchased the minority interest in Bank. This opinion does not
address the tax consequences to Bank shareholders whose shares are redeemed or
purchased prior to the merger.

Further, after consummation of the merger, BancGroup and Acquired Corporation
anticipate merging the two bank subsidiaries, the Bank and Colonial Bank.
Colonial Bank will be the surviving entity.

REPRESENTATIONS OF PARTIES

  - BancGroup and Acquired Corporation intend that the merger will qualify for
    federal income tax purposes as a "reorganization" within the meaning of
    I.R.C. Section 368(a) of the Code.

  - The fair market value of the BancGroup stock received by each shareholder
    of Acquired Corporation pursuant to the terms of the Agreement will be
    approximately equal to the fair market value of Acquired Corporation stock
    surrendered in the exchange. The terms of the Agreement are the result of
    arm's-length negotiations between unrelated parties.

  - There is no plan or intention by the shareholders of Acquired Corporation
    to sell, exchange, or otherwise dispose of a number of shares of BancGroup
    stock received in the transaction that will reduce the Acquired Corporation
    shareholders' ownership of BancGroup stock to a number of shares having a
    value, as of the date of the transaction, of less than fifty percent of the
    value of all of the formerly outstanding stock of Acquired Corporation as of
    the same date. For purposes of this representation, shares of Acquired stock
    exchanged for cash, and surrendered by dissenters, or exchanged for cash in
    lieu of fractional shares of BancGroup stock will be treated as outstanding
    Acquired Corporation stock on the date of the transaction. Shares of
    Acquired stock and shares of BancGroup stock held by Acquired Corporation
    shareholders and otherwise sold, redeemed or disposed of prior or subsequent
    to the transaction will be considered in making this representation.

<PAGE>   4


  - Following the merger, BancGroup will continue the historic business of
    Acquired Corporation or use a significant portion of Acquired Corporation's
    historic business assets in a business.

  - Acquired Corporation, BancGroup and Acquired Shareholders will pay their
    respective expenses, if any, incurred in connection with the transaction.

  - No part of the consideration received by the Acquired Corporation
    shareholders will be received by them in their capacity as debtor, creditor,
    employee, or any way other than as shareholder.

  - The fair market value of the assets of Acquired Corporation transferred to
    BancGroup will equal or exceed the sum of the liabilities assumed by
    BancGroup plus the amount of liabilities, if any, to which the assets
    transferred are subject.

  - The total adjusted basis of the assets of Acquired Corporation transferred
    to BancGroup will equal or exceed the sum of the liabilities assumed by
    BancGroup plus the amount of liabilities, if any, to which the assets
    transferred are subject.

  - If nonqualified stock options to purchase Acquired Corporation common stock
    are exchanged for nonqualified stock options to purchase BancGroup common
    stock, then the difference between the option price and fair market value of
    BancGroup common stock subject to options immediately after the exchange
    will be equal to (or greater than) the difference between the option price
    and the fair market value of Acquired Corporation common stock subject to
    options immediately before the exchange. All other terms of the BancGroup
    nonqualified stock options will be the same as those of Acquired
    Corporation's nonqualified stock options.

  - Any incentive stock options acquired from Acquired Bank as a part of the
    merger and reissued by BancGroup will be issued at substantially the same
    terms, so as not to create material modification as defined in I.R.C.
    Section 424.

  - The compensation to be paid by BancGroup or Acquired Bank to the officers
    and employees of Acquired Bank under any stock option, employment, or
    noncompete agreement will be at a rate equal to the fair market value of the
    services actually performed and will be commensurate with amounts paid to
    third parties bargaining at arm's length for similar services. In addition
    none of the compensation to be received by the shareholder-employees of
    Acquired Bank will be part of the consideration for their target stock.

  - At the time of the merger, Acquired Bank will not have outstanding any
    warrants, convertible securities, or any other right pursuant to which any
    person could acquire stock in Acquired Bank except for the 178,112 shares of
    Acquired Bank stock subject to the Stock Option Agreement.

<PAGE>   5

TAX CONSEQUENCES TO ACQUIRED CORPORATION AND BANCGROUP

The merger of Acquired Corporation with and into BancGroup will constitute a
merger within the meaning of I.R.C. Section 368(a)(1)(A), provided that the
merger qualifies as a statutory merger pursuant to state law. Acquired
Corporation and BancGroup will each be "a party to the reorganization" within
the meaning of I.R.C. Section 368(b) of the Code. Based upon I.R.C. Sections
357(a) and 361(a), Acquired Corporation will recognize no gain or loss when it
transfers its assets to BancGroup in a constructive exchange solely for
BancGroup's stock and the assumption of Acquired Corporation's liabilities by
BancGroup. Acquired Corporation will also not recognize any gain or loss upon
the receipt of cash in the exchange if it distributes such property as part of
the plan of reorganization under I.R.C. Section 361(b).

IRS Regulation Section 1.368-1(b) requires a continuity of interest therein on
the part of those persons who, directly or indirectly, were the owners of the
enterprise prior to the reorganization. The "continuity of interest" requirement
will be satisfied if there is a continuing interest through stock ownership in
BancGroup on the part of the former shareholders of the Acquired Corporation
which is equal in value, as of the effective date of the reorganization, to at
least 50% of the value of all the formerly outstanding stock of the Acquired
Corporation as of the same date.

Pursuant to I.R.C. Section 1032 of the Code, no gain or loss will be recognized
by BancGroup upon the acquisition by BancGroup of the assets of Acquired
Corporation in exchange for BancGroup common stock and the assumption of
Acquired Corporation's liabilities. BancGroup's basis in the assets acquired in
the transaction will be equal to the basis of the assets in the hands of
Acquired Corporation immediately before the transaction under I.R.C. Section
362(b). I.R.C. Section 1223(2) provides that BancGroup's holding period for each
Acquired Corporation asset received in the merger will include the period during
which the asset was held by Acquired Corporation immediately before the
transaction.

Pursuant to I.R.C. Section 381(a), BancGroup will succeed to and take into
account the items of Acquired Corporation described in I.R.C. Section 381(c),
subject to the conditions and limitations of I.R.C. Sections 381, 382, 383, 384,
and 1502 and the regulations thereunder. BancGroup will succeed to and take into
account the earnings and profits, or deficit in earnings and profits, of
Acquired Corporation as provided by I.R.C. Section 382(c)(2) of the Code and
Section 1.381(c)(2)-1 of the Regulations.

TAX CONSEQUENCES TO BANK AND COLONIAL BANK

The merger of Bank with and into Colonial Bank will constitute a merger within
the meaning of I.R.C. Section 368(a)(1)(A), provided that the merger qualifies
as a statutory merger pursuant to state law. Bank and Colonial Bank will each be
"a party to the reorganization" within the meaning of I.R.C. Section 368(b) of
the Code. Based upon I.R.C. Sections 357(a) and 361(a), Bank will recognize no
gain or loss 

<PAGE>   6


when it transfers its assets to Colonial Bank in a constructive exchange solely
for Colonial Bank's stock and the assumption of Bank's liabilities by Colonial
Bank. Bank will also not recognize any gain or loss upon the receipt of cash in
the exchange if it distributes such property as part of the plan of
reorganization under I.R.C. Section 361(b).

Pursuant to I.R.C. Section 1032 of the Code, no gain or loss will be recognized
by Colonial Bank upon the acquisition by Colonial Bank of the assets of Bank in
exchange for Colonial Bank's common stock and the assumption of Bank's
liabilities. Colonial Bank's basis in the assets acquired in the transaction
will be equal to the basis of the assets in the hands of Bank immediately before
the transaction per I.R.C. Section 362(b). I.R.C. Section 1223(2) provides that
Colonial Bank's holding period for each Bank asset received in the merger will
include the period during which the asset was held by Bank immediately before
the transaction.

Pursuant to I.R.C. Section 381(a), Colonial Bank's will succeed to and take into
account the items of Bank described in I.R.C. Section 381(c), subject to the
conditions and limitations of I.R.C. Sections 381, 382, 383, 384, and 1502 and
the regulations thereunder. Colonial Bank will succeed to and take into account
the earnings and profits, or deficit in earnings and profits, of Bank as
provided by I.R.C. Section 382(c)(2) of the Code and Section 1.381(c)(2)-1 of
the Regulations.

TAX CONSEQUENCES TO ACQUIRED CORPORATION SHAREHOLDERS

I.R.C. Section 354 states that a shareholder who receives solely BancGroup
common stock in exchange for Acquired Corporation common stock will recognize no
gain or loss on the exchange, except with respect to cash received in lieu of a
fractional interest in BancGroup common stock. I.R.C. Section 358 of the Code
provides that the shareholder's tax basis in the BancGroup common stock received
in the exchange will be the same as the basis of the Acquired Corporation common
stock surrendered, decreased by the amount of cash (if any) received by the
shareholder and increased by the amount of gain (if any) recognized in the
exchange. I.R.C. Section 1223 of the Code provides that such shareholder will
include the period during which Acquired Corporation stock was held in his
holding period for the BancGroup common stock received in the exchange.

The payment of cash in lieu of fractional shares of BancGroup common stock will
be treated as if the fractional shares were issued as part of the exchange and
then redeemed by BancGroup. These cash payments will be treated as having been
received as distributions in full payment in exchange for the stock redeemed as
provided in I.R.C. Section 302(a) of the Code. Generally, any gain or loss
recognized upon such exchange will be capital gain or loss, provided the
fractional share constitutes a capital asset in the hands of the exchanging
shareholder. The shareholders will recognize capital gain or loss equal to the
difference between the cash received and the basis of the fractional share
interest that would have been issued.

<PAGE>   7


Holders of shares of Acquired Corporation common stock who receive cash upon the
exercise of any appraisal rights will be subject to a taxable transaction for
federal income tax purposes. Such a shareholder will recognize gain or loss
measured by the difference between the tax basis for his or her shares and the
amount of cash received pursuant to I.R.C. Section 1012 of the Code (unless the
receipt of cash is treated as a dividend, as described below).

In certain circumstances, the receipt of solely cash by an Acquired Corporation
shareholder could be treated as a dividend under Section 302(a) (to the extent
of the shareholder's ratable share of applicable earnings and profits) if the
shareholder constructively owns shares of Acquired Corporation Common Stock that
are exchanged for BancGroup Common Stock in the Merger. Generally, a shareholder
constructively owns stock that is owned by members of the shareholder's family,
and by certain controlled or related partnerships, estates, trusts and
corporations, pursuant to the constructive ownership rules of I.R.C. Section 318
of the Code, as well as any shares that the shareholder has an option to
acquire.

The receipt of solely cash by an Acquired Corporation shareholder in exchange
for his stock will not be treated as a dividend if such exchange or receipt
results in a meaningful reduction or a substantially disproportionate reduction
in the shareholder's ownership interest or results in a complete termination of
the shareholder's interest, taking into account, in each case, the constructive
ownership rules described above. A complete termination of a shareholder's
interest will occur if, after the receipt of cash in exchange for stock, the
shareholder owns no shares of stock in BancGroup. Thus, a shareholder who
receives solely cash for all of the stock actually owned by him will generally
qualify for capital gain treatment under the complete termination test if none
of the shares constructively owned by him are exchanged in the merger for
BancGroup Common Stock and the shareholder does not otherwise own, actually or
constructively, any shares of BancGroup Common Stock after the merger.

Where the complete termination of interest test is not satisfied with respect to
a particular shareholder (because, for example, Acquired Corporation shares
owned by a related party are exchanged for BancGroup Common Stock in the
merger), that shareholder will nonetheless generally be entitled to capital gain
treatment if the receipt of cash in exchange for his shares results in a
"substantially disproportionate" reduction or a "meaningful" reduction in his
ownership interest. I.R.C. Section 302 of the Code provides that a shareholder's
reduction in ownership interest should normally be "substantially
disproportionate," and capital gain treatment should normally result, if (1) the
shareholder owns less than 50% of the total combined voting power of all classes
of stock immediately after the merger, and (2) the shareholder's proportionate
stock interest in BancGroup immediately after the merger is 20% or more below
what his proportionate interest in BancGroup would have been if he had received
solely BancGroup Common Stock in the merger.

<PAGE>   8


Acquired Corporation shareholders who constructively own stock in Acquired
Corporation should consult a tax advisor regarding the characterization of cash
payments received in the reorganization in exchange for Acquired Corporation
stock as either capital gain income or dividend income.

CONVERSION OF ACQUIRED CORPORATION OPTIONS INTO BANCGROUP STOCK

        INCENTIVE STOCK OPTIONS

The shareholders of Acquired Corporation can elect to receive shares of
BancGroup common stock for the difference between the exercise price of Acquired
Corporation options and the fair market value of BancGroup stock at the
effective date of the Agreement. This election, if made, is effectively a
"cashless exercise" of an incentive stock option (i.e., the option holder is
treated as exercising all of the options and remitting a portion of the
BancGroup stock to Acquired Corporation in satisfaction of the exercise price
("foregone stock")). The cashless exercise of Acquired Corporation incentive
stock options will result in the option holder recognizing ordinary income equal
to the amount of the bargain purchase element of the BancGroup stock foregone.
In addition, if Acquired Corporation's incentive stock plan does not have a
cashless exercise feature, the cashless exercise of an incentive stock option by
an option holder could be interpreted as a material modification under I.R.C.
Section 424. If the cashless exercise feature constitutes a material
modification, such modifications will result in the deemed granting of new
options to all holders of incentive stock options. The new options will be
subject to the requirements of I.R.C. Section 424 at the date of material
modification. The exercise of a disqualified incentive stock option will entitle
Acquired Corporation to a compensation deduction when the option is exercised.

        NONQUALIFIED STOCK OPTIONS

The shareholders of Acquired Corporation can elect to receive shares of
BancGroup common stock for the difference between the exercise price of Acquired
Corporation options and the fair market value of BancGroup stock at the
effective date of the Agreement. The cashless exercise of nonqualified stock
options does not alter the timing or character of income recognition. The
shareholders of Acquired Corporation will recognize ordinary income for the fair
market value of the stock received in conjunction with the exercise of the
options (i.e., the difference between the fair market value of BancGroup stock
and the exercise price). Acquired Corporation is entitled to a corresponding
compensation deduction in the same amount.

SUMMARY

The merger of BancGroup and Acquired Corporation will qualify as a tax-free
reorganization within the meaning of I.R.C. Section 368(a)(1)(A). BancGroup's
basis 

<PAGE>   9


in Acquired Corporation's assets will be the same as Acquired Corporation's
basis in its assets before the merger. The merger of Colonial Bank and Bank will
also qualify as a tax-free reorganization within the meaning of I.R.C. Section
368(a)(1)(A). Colonial Bank's basis in Bank's assets will be the same as Bank's
basis in its assets before the merger. Acquired Corporation shareholders will
retain a substituted basis in the shares of BancGroup stock received in the
merger decreased by the amount of cash received and increased by the amount of
gain recognized in the transaction. The only taxable consequences will be to
those shareholders who receive cash in lieu of fractional shares and those
shareholders who receive solely cash in the exchange upon perfecting their
dissenter's rights. Shareholders receiving cash must examine their actual and
constructive ownership of Acquired Corporation and BancGroup stock for purposes
of determining the tax consequences of the cash payments.

The conversion of Acquired Corporation incentive stock options directly into
BancGroup stock will result in the incentive stock option holders recognizing
ordinary income equal to the bargain purchase element of the BancGroup stock
foregone. In addition, if Acquired Corporation's incentive stock option plan
does not have a cashless exercise feature, the conversion of Acquired
Corporation incentive stock options directly into BancGroup stock could be
treated as a material modification of Acquired Corporation's incentive stock
option plan. I.R.C. Section 424 states that a material modification of an
incentive stock option plan results in the deemed granting of new options to all
incentive stock option holders subject to the requirements of I.R.C. Section 424
at the date of the material modification. The conversion of Acquired Corporation
nonqualified stock options directly into BancGroup stock will result in the
nonqualified option holders recognizing ordinary income equal to the fair market
value of BancGroup stock received. Acquired Corporation will be entitled to a
corresponding compensation deduction equal to the amount of ordinary income
recognized by Acquired Corporation option holders on the "cashless exercise" of
both incentive stock options and nonqualified stock options.

If you have any questions or comments, please call Thomas Lee or Mark Borden at
(205) 252-8400.

Very truly yours,


/s/ PricewaterhouseCoopers LLP


PricewaterhouseCoopers LLP


<PAGE>   1


                                                                    EXHIBIT 23.1



                       CONSENT OF INDEPENDENT ACCOUNTANTS

We consent to the incorporation by reference in this registration statement on
Form S-4 of our report dated March 10, 1998 on our audits of the consolidated
financial statements of The Colonial BancGroup, Inc., as of December 31, 1997
and 1996 and for the three years in the period ended December 31, 1997. We also
consent to the reference to our firm under the caption "experts".

/s/ PricewaterhouseCoopers LLP

Montgomery, Alabama
August 18, 1998

                           CONSENT OF TAX ACCOUNTANTS

        We consent to the reference in this registration statement on Form S-4
of our firm under the caption "The Merger -- Certain Federal income Tax
Consequences," and to the inclusion of our opinion at Exhibit 8 of this
Registration Statement.

/s/ PricewaterhouseCoopers LLP

Birmingham, Alabama
August 18, 1998



<PAGE>   1



                                                                    EXHIBIT 23.2



                       CONSENT OF INDEPENDENT ACCOUNTANTS

We consent to the incorporation by reference in this Registration Statement on
Form S-4 of our report dated July 21, 1998, on our audit of the financial
statements of InterWest Bancorp, and to the reference to our firm under the
caption "experts".

/s/ Kafoury, Armstrong & Co.

Carson City, Nevada
August 18, 1998



<PAGE>   1





                                                                    EXHIBIT 23.3


               Consent of Miller, Hamilton, Snider & Odom, L.L.C.






                               CONSENT OF COUNSEL

The Colonial BancGroup, Inc.

        We hereby consent to use in this Form S-4 Registration Statement of The
Colonial BancGroup, Inc., of our name in the Prospectus, which is a part of such
Registration Statement, under the heading "LEGAL MATTERS," to the summarization
of our opinion referenced therein, and to the inclusion of our opinion at
Exhibit 5 of the Registration Statement.

/s/ MILLER, HAMILTON, SNIDER & ODOM, L.L.C.

August 18, 1998



<PAGE>   1



                                                                    EXHIBIT 23.4




                          CONSENT OF FINANCIAL ADVISOR


We hereby consent to the discussion relative to our opinion delivered to the
Boards of Directors of Interwest Bancorp and Interwest Bank in connection with
the proposed reorganization of Interwest Bank in order to become a wholly
owned subsidiary of Interwest Bancorp; in the Proxy Statement and Prospectus
included in the Colonial BancGroup, Inc.'s Registration Statement on Form S-4
under the caption "The Merger - Repurchase of Minority Shares" and to the
reference to our firm in such Proxy Statement and Prospectus.



/s/ David A. Alford
Principal               




TASG, Inc.
Dba The Alford - Spencer Financial Group
August 19, 1998



<PAGE>   1




                                                                      EXHIBIT 24

                                POWER OF ATTORNEY


<PAGE>   2




                                                                      EXHIBIT 24

                                POWER OF ATTORNEY

        KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears
below constitutes and appoints Robert E. Lowder, P. L. McLeod, Jr., and W. Flake
Oakley, IV, and each of them, his or her true and lawful attorney-in-fact and
agent, with full power of substitution and resubstitution, for him or her and in
his or her name, place and stead, to sign any reports or other filings which may
be required to be filed with the Securities and Exchange Commission on behalf of
The Colonial BancGroup, Inc. (the "Registrant"), in relation to the Registrant's
acquisition by merger of (i) InterWest Bancorp, Reno, Nevada pursuant to the
terms of the certain Agreement and Plan of Merger by and between the Registrant
and InterWest Bancorp and (ii) other financial institutions or related holding
companies upon terms and conditions approved by the Chairman of the Board and
Chief Executive Officer (the "Acquisitions"); to sign any registration statement
of the Registrant on Form S-4 or other appropriate form and any amendments
thereto for the purpose of registering under the Securities Act of 1933, as
amended, shares to be offered and sold by the Registrant in relation to the
Acquisitions; to file such other reports or other filings, such registration
statements and amendments thereto, with all exhibits thereto, and any documents
in connection therewith with the Securities and Exchange Commission; and to file
such notices, reports or registration statements (and amendments thereto) with
any such securities authority of any state which may be necessary to register or
qualify for an exemption from registration any securities offered or sold by
BancGroup in such states in relation to the Acquisitions, granting unto said
attorneys-in-fact and agents full power and authority to do and perform each and
every act and thing requisite to be done in connection with the Acquisitions as
fully and to all intents and purposes as he or she might or could do in person,
hereby ratifying and confirming all that said attorneys-in-fact and agents, or
their substitutes, may lawfully do or cause to be done by virtue hereof.

        Done this 15th day of April, 1998, in Montgomery, Alabama.




                [The rest of this page intentionally left blank]


<PAGE>   3



/s/ Robert E. Lowder                                      Chairman of the Board
- ------------------------------                            and Chief Executive
Robert E. Lowder                                          Officer            


/s/ Lewis Beville                                         Director
- ------------------------------
Lewis Beville


/s/ Young J. Boozer, Jr.                                  Director
- ------------------------------
Young J. Boozer, Jr.


/s/ William Britton                                       Director
- ------------------------------
William Britton


/s/ Jerry J. Chesser                                      Director
- ------------------------------
Jerry J. Chesser


/s/ Augustus K. Clements, III                             Director
- ------------------------------
Augustus K. Clements, III


/s/ Robert Craft                                          Director
- ------------------------------
Robert Craft


/s/ Patrick F. Dye                                        Director
- ------------------------------
Patrick F. Dye


/s/ James L. Hewitt                                       Director
- ------------------------------
James L. Hewitt


/s/ Clinton Holdbrooks                                    Director
- ------------------------------
Clinton Holdbrooks


/s/ D. B. Jones                                           Director
- ------------------------------
D. B. Jones


/s/ Harold D. King                                        Director
- ------------------------------
Harold D. King


<PAGE>   4


/s/ John Ed Mathison                                      Director
- ------------------------------
John Ed Mathison


/s/ Milton McGregor                                       Director
- ------------------------------
Milton McGregor


/s/ John C. H. Miller, Jr.                                Director
- ------------------------------
John C. H. Miller, Jr.


/s/ Joe D. Mussafer                                       Director
- ------------------------------
Joe D. Mussafer


/s/ William E. Powell, III                                Director
- ------------------------------
William E. Powell, III


/s/ J. Donald Prewitt                                     Director
- ------------------------------
J. Donald Prewitt


/s/ Jack H. Rainer                                        Director
- ------------------------------
Jack H. Rainer


/s/ Jimmy Rane                                            Director
- ------------------------------
Jimmy Rane


/s/ Frances E. Roper                                      Director
- ------------------------------
Frances E. Roper


/s/ Simuel Sippial                                        Director
- ------------------------------
Simuel Sippial


/s/ Ed V. Welch                                           Director
- ------------------------------
Ed V. Welch



<PAGE>   1



                                                                    EXHIBIT 99.1

                       Form of Proxy of InterWest Bancorp


<PAGE>   2
 
          PROXY FOR SPECIAL SHAREHOLDERS MEETING OF INTERWEST BANCORP
 
    KNOW ALL MEN BY THESE PRESENTS, that I, the undersigned shareholder of
InterWest Bancorp ("InterWest"), do hereby nominate, constitute, and appoint,
            and             , or any one of them (with full power and
substitution for me and in my name, place and stead) to vote all the common
stock of InterWest standing in my name on its books on         , 1998 at the
Special Meeting of its shareholders to be held at             , on         ,
1998 at             .m., local time, or any adjournments thereof with all the
powers the undersigned would possess if personally present as follows:
 
1.  To ratify, confirm, approve and adopt an Agreement and Plan of Merger dated
    as of June 16, 1998 (the "Agreement"), by and between InterWest and The
    Colonial BancGroup, Inc. ("BancGroup"), with such agreement providing for,
    among other things, the merger of InterWest with and into BancGroup, with
    BancGroup to be the surviving corporation. Each outstanding share of
    InterWest common stock will be converted into common shares of BancGroup in
    accordance with the terms of the Agreement.
 
            [ ]  FOR            [ ]  AGAINST            [ ]  ABSTAIN
 
2.  To transact such other business as may properly come before the meeting or
    any adjournment thereof.
 
    This proxy confers authority to vote "FOR" the propositions listed above
unless "AGAINST" or "ABSTAIN" is indicated. If any business is presented at said
meeting, this proxy shall be voted in accordance with the recommendations of
management. All shares represented by properly-executed proxies will be voted as
directed.
 
    The Board of Directors recommends a vote "FOR" the propositions. THIS PROXY
IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS and may be revoked prior to its
exercise by either written notice or personally at the meeting or by a
subsequently-dated proxy.
 
                                                  Date:                   , 1998
                                                     ----------------------
 
                                                  ------------------------------
 
                                                  ------------------------------
                                                  (Signature of Shareholder(s))
 
                                                  (WHEN SIGNING AS ATTORNEY,
                                                  EXECUTOR, ADMINISTRATOR,
                                                  TRUSTEE OR GUARDIAN, PLEASE
                                                  GIVE FULL TITLE. IF MORE THAN
                                                  ONE TRUSTEE, ALL SHOULD SIGN.
                                                  ALL JOINT OWNERS MUST SIGN.)


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