WESTAMERICA BANCORPORATION
S-4, 1994-12-22
NATIONAL COMMERCIAL BANKS
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<PAGE>
 
     As filed with the Securities and Exchange Commission on December 22, 1994.

                                                    Registration No. 33-________
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                ________________

                                    FORM S-4
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                                ________________

                           WESTAMERICA BANCORPORATION
             (Exact name of registrant as specified in its charter)

   California                           6025                   94-2156203
(State or other                  (Primary Standard          (I.R.S. Employer
 jurisdiction of                    Industrial            Identification No.)
 incorporation or               Classification Code
 organization)                        Number)
 
                                ________________

        1108 Fifth Avenue, San Rafael, California 94901, (415) 257-8000
         (Address, including zip code, and telephone number, including
            area code, of registrant's principal executive offices)
                                ________________

                                 DAVID L. PAYNE
                Chairman, President and Chief Executive Officer
                           Westamerica Bancorporation
                               1108 Fifth Avenue
                          San Rafael, California 94901
                                 (415) 257-8000
               (Name, address, including zip code, and telephone
               number, including area code, of agent for service)
                                ________________

                                   Copies to:

       JONATHAN D. JOSEPH, ESQ.                   JAMES E. TOPINKA, ESQ.
     GABRIELLA A. LOMBARDI, ESQ.                   LAWRENCE B. LOW, ESQ.
      Pillsbury Madison & Sutro                       Pettit & Martin   
            P.O. Box 7880                          101 California Street
 San Francisco, California 94120-7880             San Francisco, CA 94111
            (415) 983-1000                             (415) 434-4000

    Approximate date of commencement of proposed sale of the securities to the
public:  As soon as practicable after this Registration Statement becomes
effective.

    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 to       Maximum Offering     Maximum Aggregate       Amount of    
 Securities to Be Registered    Be Registered(1)   Price Per Share       Offering Price       Registration Fee(2)
- ------------------------------------------------------------------------------------------------------------------- 
<S>                             <C>                <C>                  <C>                   <C>  
Common Stock,
without par value(3)             406,828 shares      Not Applicable        Not Applicable         $3,517.50
===================================================================================================================  
</TABLE>

(1)  This Registration Statement relates to securities of the Registrant
     issuable to holders of common stock of CapitolBank Sacramento, a California
     corporation ("CapitolBank"), in the proposed merger of CapitolBank with the
     Registrant.  Represents the approximate number of shares of Common Stock of
     the Registrant to be issued upon the consummation of the merger, based upon
     the number of shares of CapitolBank common stock outstanding on December
     16, 1994, all as provided in the Agreement and Plan of Reorganization
     attached as Annex A to the attached Proxy Statement/Prospectus.

(2)  Pursuant to Rule 457(f), the registration fee was computed on the basis of
     $10,200,755, the market value of the common stock of CapitolBank to be
     exchanged in the merger, computed in accordance with Rule 457(c) on the
     basis of the average of the bid and asked price per share of such stock as
     quoted on the "pink sheets" published by the National Quotation Bureau,
     Inc. on December 16, 1994.

(3)  Associated with and attached to each share of Common Stock are common stock
     purchase rights which will not be exercisable or evidenced separately from
     the Common Stock prior to the occurrence of certain events.
================================================================================
<PAGE>
 
                           WESTAMERICA BANCORPORATION

Cross-Reference Sheet pursuant to Item 501(b) of Regulation S-K showing the
location in the Proxy Statement/Prospectus of the information required by Part I
of Form S-4.


<TABLE>
<CAPTION>
         Form S-4 Caption                        Location in Proxy Statement/Prospectus
         ----------------                        --------------------------------------
<S>      <C>                                     <C> 
A.       INFORMATION ABOUT THE TRANSACTION.
         ---------------------------------
 
Item 1   Forepart of Registration Statement      Outside front cover page; facing page
         and Outside Front Cover Page of 
         Prospectus
 
Item 2   Inside Front and Outside Back           Available Information; Incorporation
         Cover Pages of Prospectus               of Certain Documents by Reference;
                                                 Table of Contents
 
Item 3   Risk Factors, Ratio of                  Summary; The Meeting; Certain
         Earnings to Fixed Charges and Other     Considerations; The Merger;
         Information                             Dissenters' Rights of Appraisal;
                                                 Market Price and Dividend Information
 
Item 4   Terms of the Transaction                Summary; The Meeting; The Merger;
                                                 Dissenters' Rights of Appraisal;
                                                 Market Price and Dividend
                                                 Information; Management's Discussion
                                                 and Analysis of Financial Condition
                                                 and Results of Operation of
                                                 CapitolBank; Certain Differences in
                                                 Rights of Shareholders; Description
                                                 of Westamerica Capital Stock and
                                                 Indebtedness; Description of
                                                 CapitolBank Capital Stock
 
Item 5   Pro Forma Financial                     Summary; Pro Forma Combined Financial
         Information                             Information
 
Item 6   Material Contracts with the             Summary; The Meeting; Certain
         Company Being Acquired                  Considerations; The Merger
 
Item 7   Additional Information                  Not Applicable
         Required for Reoffering by Persons
         and Parties Deemed to be Underwriters
 
Item 8   Interests of Named Experts              Not Applicable
         and Counsel
 
Item 9   Disclosure of Commission                Not Applicable
         Position on Indemnification for
         Securities Act Liabilities
 
B.       INFORMATION ABOUT THE REGISTRANT.
         --------------------------------
 
Item 10  Information with Respect to             Incorporation of Certain Documents by
         S-3 Registrants                         Reference
 
Item 11 Incorporation of Certain                 Incorporation of Certain Documents by
        Information by Reference                 Reference
 
</TABLE>
<PAGE>
 
<TABLE>
<CAPTION>
         Form S-4 Caption                        Location in Proxy Statement/Prospectus
         ----------------                        --------------------------------------
<S>      <C>                                     <C>  
Item 12  Information with Respect to             Not Applicable
         S-2 or S-3 Registrants                  
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
 
Item 13  Incorporation of Certain                Not Applicable
         Information by Reference
 
Item 14  Information with Respect to             Not Applicable
         Registrants Other Than S-3 or S-2
         Registrants
 
C.       INFORMATION ABOUT THE COMPANY BEING ACQUIRED.
         --------------------------------------------
 
Item 15  Information with Respect to             Not Applicable
         S-3 Companies
 
Item 16  Information with Respect to             Available Information; Incorporation
         S-2 or S-3 Companies                    of Certain Documents by Reference;
                                                 Summary; Information about
                                                 CapitolBank; Management's Discussion
                                                 and Analysis of Financial Condition
                                                 and Results of Operations of
                                                 CapitolBank; Supplemental Historical
                                                 Information; Market Price and
                                                 Dividend Information; Description of
                                                 CapitolBank Capital Stock; Index to
                                                 Financial Statements
 
Item 17  Information with Respect to             Not Applicable
         Companies Other Than S-2 or S-3
         Companies
 
D.       VOTING AND MANAGEMENT INFORMATION.
         ---------------------------------
 
Item 18  Information if Proxies, Consents        Incorporation of Certain Documents by
         or Authorizations are to be             Reference; Summary; Introduction;
         Solicited                               Information about Westamerica;
                                                 Information about CapitolBank; The
                                                 Meeting; The Merger; Dissenters'
                                                 Rights of Appraisal; Solicitation of
                                                 Proxies; Proposals of Security Holders
 
Item 19  Information if Proxies,                 Not Applicable
         Consents or Authorizations are not
         to be Solicited or in an Exchange
         Offer
</TABLE>
<PAGE>
 
                                                                January 20, 1995

   Dear Shareholder:

        You are cordially invited to attend a Special Meeting of the
   Shareholders of CapitolBank Sacramento ("CapitolBank") to be held at 300
   Capitol Mall, Sacramento, California, at 5:00 p.m. local time, on February
   23, 1995 (the "Meeting").

        At the Meeting, CapitolBank shareholders will be asked to consider and
   vote upon a proposal to approve and adopt an Agreement and Plan of
   Reorganization dated as of November 17, 1994 (the "Agreement"), by and
   between Westamerica Bancorporation ("Westamerica") and CapitolBank, an
   Agreement of Merger among Westamerica, CapitolBank and Westamerica Merger
   Subsidiary, a wholly-owned subsidiary of Westamerica ("Merger Sub"),
   (collectively, the "Agreements"), the merger of Merger Sub with and into
   CapitolBank (the "Merger"), and the transactions contemplated thereby as more
   fully described in the accompanying Proxy Statement/Prospectus.  Copies of
   the Agreements are attached to the Proxy Statement/Prospectus as Annex A.
   Shortly after the Merger, it is anticipated that CapitolBank will be merged
   with and into Westamerica Bank, a wholly owned subsidiary of Westamerica.  No
   other business is expected to be transacted at the Meeting other than matters
   incidental to the conduct of the Meeting.

        As a result of the Merger, each share of CapitolBank common stock
   ("CapitolBank Common Stock"), outstanding at the effective time of the Merger
   (other than shares with respect to which dissenters' rights are perfected)
   will be converted into .0938 of a share of Westamerica common stock, without
   par value ("Westamerica Common Stock"), subject to certain potential downward
   adjustments described in the Agreement and the accompanying Proxy
   Statement/Prospectus. No fractional shares of Westamerica Common Stock shall
   be issued to holders of shares of CapitolBank Common Stock, and, in lieu
   thereof, cash will be paid to CapitolBank shareholders in accordance with the
   Agreement.

        Under the California General Corporation Law, the approval and adoption
   of the Agreements and the transactions contemplated thereby requires the
   affirmative vote of the holders of a majority of the outstanding shares of
   CapitolBank Common Stock.  The proposed Merger is also subject to certain
   regulatory approvals and satisfaction of the conditions contained in the
   Agreement.

        THE CAPITOLBANK BOARD OF DIRECTORS, BY UNANIMOUS VOTE OF ALL DIRECTORS,
   HAS APPROVED THE AGREEMENTS, THE MERGER AND THE TRANSACTIONS CONTEMPLATED
   THEREBY AND RECOMMENDS THAT THE SHAREHOLDERS VOTE FOR APPROVAL AND ADOPTION
                                                     ---                      
   OF THE AGREEMENTS, THE MERGER AND THE TRANSACTIONS CONTEMPLATED THEREBY AT
   THE MEETING.

        The accompanying Notice and Proxy Statement/Prospectus describe the
   matters to be acted upon at the Meeting.  Shareholders are urged to review
   carefully the attached Proxy Statement/Prospectus, including the annexes
   thereto.  Such documents contain a detailed description of the Merger, its
   terms and conditions and the transactions contemplated thereby.

        Your continuing interest in the business of CapitolBank is appreciated,
   and we hope you will attend the Meeting in person.  It is important that your
   shares be represented at the Meeting.  Accordingly, whether or not you plan
   to attend the Meeting, please sign, date and mail the enclosed Proxy promptly
   in the postage-paid envelope that has been provided to you for your
   convenience.  If you wish to vote in accordance with the recommendation of
   your Board of Directors, it is not necessary to specify your choices; you may
   merely sign, date and return the enclosed Proxy.

                                       Sincerely,


                                       __________________________
                                       Thayer T. Prentice
                                       Vice Chairman of the Board
<PAGE>
 
                             CAPITOLBANK SACRAMENTO

                   NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
                        TO BE HELD ON FEBRUARY 23, 1995


        NOTICE IS HEREBY GIVEN that a Special Meeting of Shareholders of
   CapitolBank Sacramento ("CapitolBank") will be held at 300 Capitol Mall,
   Sacramento, California, on February 23, 1995 at 5:00 p.m., local time (the
   "Meeting"), for the following purposes, all of which are more fully described
   in the accompanying Proxy Statement/Prospectus:

        To consider and vote upon a proposal to adopt and approve the Agreement
        and Plan of Reorganization dated as of November 17, 1994 (the
        "Agreement"), by and between Westamerica Bancorporation ("Westamerica")
        and CapitolBank, an Agreement of Merger among Westamerica, CapitolBank
        and Westamerica Merger Subsidiary, a wholly-owned subsidiary of
        Westamerica ("Merger Sub") (collectively, the "Agreements"), the merger
        of Merger Sub with and into CapitolBank (the "Merger"), and the
        transactions contemplated thereby.

        The Agreements are set forth in Annex A to the accompanying Proxy
   Statement/Prospectus.

        No other business will be transacted at the Meeting other than matters
   incidental to the conduct of the Meeting.

               THE BOARD OF DIRECTORS OF CAPITOLBANK UNANIMOUSLY
               RECOMMENDS THAT YOU VOTE FOR THE MERGER. 
                                        ---                     

        The CapitolBank Board of Directors has fixed the close of business on
   January 13, 1995, as the record date for the Meeting.  Only CapitolBank
   shareholders of record at the close of business on such date are entitled to
   notice of and to vote at the Meeting.  Approval of the Merger requires the
   affirmative vote of the holders of not less than a majority of the
   outstanding shares of CapitolBank common stock.

        Your vote is important regardless of the number of shares you own.  Each
   shareholder, even though he or she may now plan to attend the Meeting in
   person, is requested to sign, date and return the enclosed Proxy without
   delay in the enclosed postage-paid envelope.  You may revoke your Proxy at
   any time prior to its exercise.  Any shareholder present in person at the
   Meeting or at any adjournments or postponements thereof may revoke his or her
   Proxy and vote personally on each matter brought before the Meeting.

                                            By Order of the Board of Directors,


                                            ___________________________
                                            Lawrence D. McGovern
                                            Corporate Secretary

   January 20, 1995
   Sacramento, California

                  PLEASE DATE AND SIGN THE ENCLOSED PROXY AND
           RETURN IT PROMPTLY IN THE ENCLOSED POSTAGE-PAID ENVELOPE.
<PAGE>

                SUBJECT TO COMPLETION, DATED DECEMBER __, 1994
 
                             CAPITOLBANK SACRAMENTO
                                PROXY STATEMENT
      For Special Meeting of Shareholders to be held on February 23, 1995
                                ________________
                           WESTAMERICA BANCORPORATION
                                   PROSPECTUS

     This Proxy Statement/Prospectus (the "Proxy Statement/Prospectus") is being
furnished to shareholders of CapitolBank Sacramento ("CapitolBank") in
connection with the solicitation of Proxies by the Board of Directors of
CapitolBank for use at the Special Meeting of Shareholders of CapitolBank to be
held at 300 Capitol Mall, Sacramento, California, on February 23, 1995 at 5:00
p.m., local time, and at any adjournments or postponements thereof (the
"Meeting").

      At the Meeting, the shareholders of record of CapitolBank common stock,
("CapitolBank Common Stock" or "CapitolBank Shares"), as of the close of
business on January 13, 1995, will consider and vote upon a proposal to approve
and adopt an Agreement and Plan of Reorganization dated as of November 17, 1994
(the "Agreement"), by and between Westamerica Bancorporation ("Westamerica") and
CapitolBank, an Agreement of Merger among Westamerica, CapitolBank and
Westamerica Merger Subsidiary, a wholly-owned subsidiary of Westamerica ("Merger
Sub") (collectively, the "Agreements"), the merger of Merger Sub with and into
CapitolBank (the "Merger") and the transactions contemplated thereby as more
fully described herein.  Copies of the Agreements are attached to this Proxy
Statement/Prospectus as Annex A.  Pursuant to the Agreements, upon consummation
of the Merger, each share of CapitolBank Common Stock outstanding at the
Effective Time (as defined herein) of the Merger (other than fractional shares
and shares with respect to which dissenters' rights have been perfected) will be
converted into .0938 of a share (the "Exchange Ratio") of common stock of
Westamerica, without par value (the "Westamerica Common Stock" or "Westamerica
Shares"), subject to potential downward adjustments under certain circumstances.
Shortly thereafter, it is anticipated that CapitolBank will be merged with and
into Westamerica's principal banking subsidiary, Westamerica Bank. The Exchange
Ratio will be adjusted downward pursuant to formulas set forth in the Agreement
if (i) the average of the closing price per share of Westamerica Common Stock
quoted on the Nasdaq National Market ("NNM") for the twenty consecutive trading
days prior to two business days prior to the effective date of the Merger (the
"Determination Date") (such average price, the "Average Price") is more than
$33.00; or (ii) certain Significant Liabilities (as defined herein under "The
Merger--Exchange Ratio; Conversion of Shares of CapitolBank Common Stock," and 
"--Possible Adjustments to Exchange Ratio or Termination of the Agreement")
arise prior to the Determination Date, in which case, a maximum adjustment not
to exceed .0077 of a Westamerica Share could result, as more fully described
herein. If the Average Price on the Determination Date is less than $30.20,
CapitolBank may accept the Exchange Ratio, as adjusted for Significant
Liabilities, or the parties have the right, but not the obligation, to
renegotiate the Exchange Ratio. Should CapitolBank fail to accept the Exchange
Ratio, as adjusted, and the parties fail to renegotiate the Exchange Ratio, the
Agreement may be terminated by CapitolBank.

     Based on the closing price on NNM of Westamerica Common Stock on ________,
1995 of $_____ per share, each holder of CapitolBank Common Stock would receive
the equivalent of $______ per share for each share of CapitolBank Common Stock,
assuming the Average Price on the Determination Date is $_____ if there is no
adjustment for Significant Liabilities, and $_____ per share if the maximum
Significant Liabilities adjustment occurs. See "Certain Considerations--Tyler v.
Wickland."

     This Proxy Statement/Prospectus and the accompanying letter of the Vice
Chairman, Notice of Special Meeting and form of Proxy are first being mailed to
shareholders of CapitolBank on or about January 20, 1995.

     This Proxy Statement/Prospectus also serves as a prospectus for Westamerica
under the Securities Act of 1933, as amended (the "Securities Act"), for the
issuance of shares of Westamerica Common Stock (including the associated
Westamerica Common Stock purchase rights described under "Description of
Westamerica Capital Stock and Indebtedness--Shareholder Rights Plan" with
respect to such shares) in the Merger. On ___________, 1995, the closing price
of Westamerica Common Stock on NNM was $_____ and the average of the bid and
asked price of CapitolBank Common Stock on the Pink Sheets (as defined herein)
was $_____.

THE ABOVE MATTERS ARE DISCUSSED IN DETAIL IN THIS PROXY STATEMENT/PROSPECTUS.
THE PROPOSED MERGER IS A COMPLEX TRANSACTION.  SHAREHOLDERS ARE STRONGLY URGED
TO READ AND CONSIDER CAREFULLY THIS PROXY STATEMENT/PROSPECTUS IN ITS ENTIRETY.
                        -------------------------------
THE SECURITIES TO BE ISSUED IN THE MERGER 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 PROXY STATEMENT/PROSPECTUS.  ANY
REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
                         -----------------------------
        The date of this Proxy Statement/Prospectus is January ___, 1995

Information contained herein is subject to completion or amendment. A 
registration statement relating to these securities has been filed with the 
Securities and Exchange Commission. These securities may not be sold nor may 
offers to buy be accepted prior to the time the registration statement becomes 
effective. This prospectus shall not constitute an offer to sell or the 
solicitation of an offer to buy nor shall there be any sale of these securities 
in any State in which such offer, solicitation or sale would be unlawful prior 
to registration or qualification under the securities laws of any such State.
<PAGE>
 
 
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                    Page 
                                    ----
<S>                                 <C>  
AVAILABLE INFORMATION..............   1
INCORPORATION OF CERTAIN DOCUMENTS
  BY REFERENCE.....................   2
SUMMARY............................   4
  Information about the Parties....   4
  The Meeting and Vote Required....   5
  Certain Considerations...........   5
  Reasons for the Merger;
   Recommendation of the Board of 
   Directors.......................   5
  Opinions of Financial Advisors...   6
  Effective Date of the Merger.....   6
  Exchange Ratio; Possible
   Adjustments to Exchange Ratio...   6
  Treatment of Stock Options.......   7
  Conditions and Regulatory          
   Approvals.......................   8
  Stock Option Agreement...........   8
  Noncompetition Agreements........   9
  Certain Tax Consequences.........   9
  Amendment and Termination........   9
  Expenses.........................  10
  Accounting Treatment.............  10
  Dissenters' Rights of Appraisal..  11
  Market Price and Dividend Data...  11
  Differences in Applicable Law
   and Rights of Shareholders......  12
  Selected Historical and Pro Forma 
   Financial Data..................  12
INTRODUCTION.......................  17
INFORMATION ABOUT WESTAMERICA......  17
  Pending Acquisitions.............  18
INFORMATION ABOUT CAPITOLBANK......  19
THE MEETING........................  19
  Matters to be Considered at the    
   Meeting.........................  19
  Certain Agreements...............  20
CERTAIN CONSIDERATIONS.............  20
  Tyler v. Wickland................  21
  Shares Eligible for Future Sale;   
   Dilution........................  21
  Interests of CapitolBank
   Officers and Directors in the 
   Merger..........................  22
  Real Estate Lending Activities;
   Nonperforming Assets............  22
  Organizational Structure and       
   Operations After the Merger.....  23
  Effect of Shareholder Rights 
   Plan............................  23
  Legislative and Regulatory         
   Environment.....................  23
THE MERGER.........................  24
  Background of the Merger.........  24
  Reasons for the Merger;
   Recommendation of the Board of 
   Directors.......................  25
  Opinions of CapitolBank's          
   Financial Advisors..............  26
  Effective Date of the Merger.....  37
  Exchange Ratio; Conversion of
   Shares of CapitolBank Common 
   Stock...........................  37
  Possible Adjustments to Exchange
   Ratio or Termination of the 
   Agreement.......................  37
  Exchange of CapitolBank Stock
   Certificates; Fractional 
   Interests.......................  39
  Treatment of Stock Options.......  40
  Covenants of Westamerica and
   CapitolBank; Conduct of Business 
   Prior to the Merger.............  41
  Management and Operations 
   Following the Merger............  42
  Representations and Warranties;       
   Conditions to the Merger........  43  
</TABLE>

<TABLE>
<CAPTION> 
                                    Page
                                    ----
<S>                                 <C>
  Required Regulatory Approvals....  44
  Trading Markets for Stock 
   Listing.........................  45
  Stock Option Agreement...........  45
  Noncompetition Agreements........  48
  Certain Tax Consequences.........  49
  Amendment; Termination...........  50
  Expenses.........................  52
  Accounting Treatment.............  52
  Resales of Westamerica Common 
   Stock...........................  52
DISSENTERS' RIGHTS OF APPRAISAL....  52
PRO FORMA COMBINED FINANCIAL
 INFORMATION.......................  54
SUPPLEMENTAL HISTORICAL
 INFORMATION.......................  63
MARKET PRICE AND DIVIDEND
 INFORMATION.......................  65
  Market Quotations................  65
  Dividends and Dividend Policy....  67
MANAGEMENT'S  DISCUSSION AND
 ANALYSIS OF FINANCIAL CONDITION
 AND RESULTS OF OPERATIONS OF   
 CAPITOLBANK.......................  68
  Results of Operations............  68
  Commitments and Letters of 
   Credit..........................  77
  Liquidity........................  78
  Interest Rate Sensitivity........  78
  Capital..........................  79
  Investment Securities............  80
  Deposits.........................  81
  Selected Ratios..................  81
CERTAIN DIFFERENCES IN RIGHTS OF
 SHAREHOLDERS......................  81
  General..........................  81
  Quorum Requirements..............  82
  Indemnification of Directors and
   Executive Officers..............  82
  Shareholder Meetings and Action 
   by Written Consent..............  84
  Amendment of Bylaws..............  84
  Meetings Called by the               
   Superintendent..................  85
  Filling Vacancies on the Board 
   of Directors....................  85
  Notice of Shareholder Business...  85
  Notice of Director Nominations...  86
  Westamerica "Interested Person"     
   Provision.......................  86
DESCRIPTION OF WESTAMERICA CAPITAL
 STOCK AND INDEBTEDNESS............  87
  Common Stock.....................  87
  Preferred Stock and Class B 
   Common Stock....................  87
  Debt Agreements..................  87
  Shareholder Rights Plan..........  88
DESCRIPTION OF CAPITOLBANK CAPITAL
 STOCK.............................  89
  Common Stock.....................  89
EXPERTS............................  90
LEGAL MATTERS......................  90
SOLICITATION OF PROXIES............  90
PROPOSALS OF SECURITY HOLDERS......  90
</TABLE>

 Annex A  Agreement and Plan of Reorganization and Agreements of Merger
 Annex B  Fairness Opinion of Hoefer & Arnett Incorporated
 Annex C  Fairness Opinion of Smith & Crowley Inc.
 Annex D  Stock Option Agreement
 Annex E  California General Corporation Law Chapter 13-Dissenters' Rights

                                      -i-

<PAGE>
 
        NO PERSON IS AUTHORIZED BY WESTAMERICA OR CAPITOLBANK TO GIVE ANY
      INFORMATION OR TO MAKE ANY REPRESENTATION, OTHER THAN ANY INFORMATION OR
      REPRESENTATION CONTAINED IN THIS PROXY STATEMENT/PROSPECTUS, IN CONNECTION
      WITH THE SOLICITATION AND THE OFFERING MADE BY THIS PROXY
      STATEMENT/PROSPECTUS AND, IF GIVEN OR MADE, SUCH INFORMATION OR
      REPRESENTATION SHOULD NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED. THIS
      PROXY STATEMENT/PROSPECTUS DOES NOT CONSTITUTE THE SOLICITATION OF A PROXY
      OR AN OFFER TO SELL, OR A SOLICITATION OF AN OFFER TO PURCHASE, ANY
      SECURITIES IN ANY JURISDICTION IN WHICH A SOLICITATION OR OFFERING MAY NOT
      LAWFULLY BE MADE.

        NEITHER THE DELIVERY OF THIS PROXY STATEMENT/PROSPECTUS NOR ANY
      DISTRIBUTION OF SECURITIES MADE HEREUNDER SHALL IMPLY THAT THERE HAS BEEN
      NO CHANGE IN THE INFORMATION SET FORTH HEREIN OR IN THE AFFAIRS OF
      WESTAMERICA OR CAPITOLBANK SINCE THE DATE HEREOF.


                             AVAILABLE INFORMATION

        Westamerica is subject to the informational requirements of the
      Securities Exchange Act of 1934, as amended (the "Exchange Act").  In
      accordance therewith, Westamerica files reports, proxy statements and
      other information with the Securities and Exchange Commission (the
      "Commission").  Such reports, proxy statements and other information filed
      by Westamerica with the Commission can be inspected and copied at the
      public reference facilities maintained by the Commission at 450 Fifth
      Street, N.W., Room 1024, Washington, D.C. and at the Chicago Regional
      Office, Northwestern Atrium Center, 500 West Madison Street, Suite 1400,
      Chicago, Illinois, and the New York Regional Office, Seven World Trade
      Center, 13th Floor, New York, New York.  Copies of such material also can
      be obtained from the Public Reference Section of the Commission, 450 Fifth
      Street, N.W., Washington, D.C. 20549 at prescribed rates.

        Westamerica, PV Financial, a bank holding company headquartered in 
      Modesto, California ("PV Financial"), and PV Financial's wholly-owned
      subsidiary, Pacific Valley National Bank, a national banking association
      ("Pacific Valley National Bank"), have entered into an Agreement and Plan
      of Reorganization (as amended) dated as of July 25, 1994, whereby the
      parties thereto agreed to merge PV Financial into Westamerica (the "PV
      Financial Merger"). It is anticipated that the PV Financial Merger will be
      consummated in the first quarter of 1995. PV Financial is subject to the
      informational requirements of the Exchange Act and, in accordance
      therewith, files reports, proxy statements and other information with the
      Commission. Such reports, proxy statements and other information filed by
      PV Financial with the Commission can be inspected and copied at the public
      reference facilities maintained by the Commission at the above addresses
      at prescribed rates.

        CapitolBank is subject to the informational requirements of the
      Exchange Act administered by the Federal Deposit Insurance Corporation
      (the "FDIC"). In accordance therewith, CapitolBank files reports, proxy
      statements and other information with the FDIC. Such reports, proxy
      statements and other information can be inspected and copies obtained from
      the Registration and Disclosure Section of the FDIC, 1176 F Street N.W.,
      Room 643, Washington, D.C., at prescribed rates. These documents may also
      be inspected at the Federal Reserve Bank of San Francisco, 101 Market
      Street, San Francisco, California. Westamerica has filed with the
      Commission a Current Report on Form 8-K which contains reports, proxy
      statements and other information about CapitolBank. Such reports, proxy
      statements and other information may be inspected and copied at the public
      reference facilities of the Commission listed above. Although to
      Westamerica's knowledge the information concerning CapitolBank included in
      such Current Report on Form 8-K is accurate, Westamerica has not verified
      either its accuracy or its completeness. Westamerica does not warrant that
      there have not occurred events, not yet publicly disclosed by CapitolBank,
      which would affect either the accuracy or the completeness of the
      information concerning CapitolBank included in such Current Report on Form
      8-K.

        Westamerica has filed with the Commission a Registration Statement on
      Form S-4 under the Securities Act of 1933, as amended relating to the
      shares of Westamerica Common Stock to be issued in connection with the
      Merger (together with any amendments thereto, the "Registration
      Statement"). This Proxy Statement/Prospectus also constitutes the
      Prospectus of Westamerica filed as part of the Registration Statement and
      does not contain all the information set forth in the Registration
      Statement and exhibits thereto. The Registration Statement and the
      exhibits thereto may be inspected and copied, at prescribed rates, at the
      public reference facilities maintained by the Commission at the addresses
      set forth above.

        Statements contained in this Proxy Statement/Prospectus or in any
      document incorporated by reference in this Proxy Statement/Prospectus
      relating to the contents of any contract or other 

                                      -1-
<PAGE>
 
      document referred to herein or therein are not necessarily complete, and
      in each instance reference is made to the copy of such contract or other
      document filed as an exhibit to the Registration Statement or such other
      document, each such statement being qualified in all respects by such
      reference.


                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

        THIS PROXY STATEMENT/PROSPECTUS INCORPORATES BY REFERENCE DOCUMENTS
      WHICH ARE NOT PRESENTED HEREIN OR DELIVERED HEREWITH.  THE DOCUMENTS
      INCORPORATED HEREIN BY REFERENCE BY WESTAMERICA (OTHER THAN CERTAIN
      EXHIBITS TO SUCH DOCUMENTS) ARE AVAILABLE WITHOUT CHARGE UPON REQUEST FROM
      M. KITTY JONES, CORPORATE SECRETARY, WESTAMERICA BANCORPORATION, 1108
      FIFTH AVENUE, SAN RAFAEL, CALIFORNIA 94901 (TELEPHONE (415) 257-8000).
      THE DOCUMENTS INCORPORATED HEREIN BY REFERENCE BY CAPITOLBANK (OTHER THAN
      CERTAIN EXHIBITS TO SUCH DOCUMENTS) ARE AVAILABLE WITHOUT CHARGE UPON
      REQUEST FROM LAWRENCE D. McGOVERN, CORPORATE SECRETARY, CAPITOLBANK, 300
      CAPITOL MALL, SACRAMENTO, CALIFORNIA 95814 (TELEPHONE (916) 449-8300).
      THE DOCUMENTS INCORPORATED HEREIN BY REFERENCE BY PV FINANCIAL (OTHER THAN
      CERTAIN EXHIBITS TO SUCH DOCUMENTS) ARE AVAILABLE WITHOUT CHARGE UPON
      REQUEST FROM SYLVIA J. RUDY, CORPORATE SECRETARY, PV FINANCIAL, 1524
      McHENRY AVENUE, MODESTO, CALIFORNIA 95350 (TELEPHONE (209) 575-2900).  IN
      ORDER TO ENSURE TIMELY DELIVERY OF THE DOCUMENTS IN ADVANCE OF THE MEETING
      TO WHICH THIS PROXY STATEMENT/PROSPECTUS RELATES, ANY REQUEST SHOULD BE
      MADE BY __________, 1995.

        The following documents of Westamerica are hereby incorporated by
      reference in this Proxy Statement/Prospectus and shall be deemed to be a
      part hereof from the date of filing of those documents: Westamerica's
      Annual Report on Form 10-K for the fiscal year ended December 31, 1993;
      Westamerica's Quarterly Report on Form 10-Q for the quarter ended March
      31, 1994; Westamerica's Quarterly Report on Form 10-Q for the quarter
      ended June 30, 1994; Westamerica's Quarterly Report on Form 10-Q for the
      quarter ended September 30, 1994; Westamerica's Current Report on Form 8-K
      dated July 29, 1994; Westamerica's Current Report on Form 8-K dated
      November 23, 1994; Westamerica's Current Report on Form 8-K dated December
      12, 1994; Westamerica's Current Report on Form 8-K dated December 19,
      1994; the audited financial statements of PV Financial as contained in
      Westamerica's Registration Statement on Form S-4 (33-55417) and all other
      reports and documents filed by Westamerica pursuant to Sections 13(a),
      13(c), 14 or 15(d) of the Exchange Act subsequent to the date of this
      Proxy Statement/Prospectus and prior to the termination of the offering of
      Westamerica Common Stock to which this Proxy Statement/Prospectus relates.

        The following documents of CapitolBank, filed with the Commission by
      Westamerica under cover of a Current Report on Form 8-K filed December 19,
      1994, are hereby incorporated by reference in this Proxy
      Statement/Prospectus and shall be deemed to be a part hereof from the date
      of filing of those documents:  CapitolBank's Annual Report on Form F-2 for
      the fiscal year ended December 31, 1993; CapitolBank's Quarterly Report on
      Form F-4 for the quarter ended March 31, 1994; CapitolBank's Quarterly
      Report on Form F-4 for the quarter ended June 30, 1994; CapitolBank's
      Quarterly Report on Form F-4 for the quarter ended September 30, 1994;
      CapitolBank's Proxy Statement, dated May 25, 1994; and all other reports
      and documents filed by CapitolBank with the FDIC pursuant to 12 C.F.R. 
      Part 335 et seq, and subsequently filed by Westamerica pursuant to
      Sections 13(a) and 15(d) of the Exchange Act subsequent to the date of
      this Proxy Statement/Prospectus and prior to the termination of the
      offering of Westamerica Common Stock to which this Proxy
      Statement/Prospectus relates.

        Any statement contained in a document incorporated or deemed to be
      incorporated by reference herein shall be deemed to be modified or
      superseded for purposes of this Proxy Statement/Prospectus to the extent
      that such statement is modified or replaced by a statement contained
      herein or in any other subsequently filed document that also is or is
      deemed to be incorporated by reference into this Proxy
      Statement/Prospectus. Any such statement so modified or superseded shall
      not be deemed, except as so modified or replaced, to constitute a part of
      this Proxy Statement/Prospectus.

        All information contained in this Proxy Statement/Prospectus relating to
      Westamerica has been supplied by Westamerica, and all information relating
      to CapitolBank has been supplied by CapitolBank.  Neither Westamerica nor
      CapitolBank warrants the accuracy or completeness of information relating
      to 

                                      -2-
<PAGE>
 
      the other party. Westamerica makes no representation as to the accuracy or
      completeness of any CapitolBank documents filed by Westamerica with the
      Commission pursuant to the Exchange Act.

                                      -3-
<PAGE>
 
                                    SUMMARY

         The following is a summary of certain information contained elsewhere
      in this Proxy Statement/Prospectus.  Reference is made to, and this
      Summary is qualified in its entirety by, the more detailed information
      contained elsewhere in this Proxy Statement/Prospectus, in the attached
      Annexes and in the documents incorporated herein by reference.
      Shareholders are urged to read carefully this Proxy Statement/Prospectus
      and the attached Annexes in their entirety.  Certain capitalized terms
      which are used but not defined in this Summary are defined elsewhere in
      this Proxy Statement/Prospectus.


      Information about the Parties

         Westamerica is a bank holding company, headquartered in San Rafael,
      California, incorporated under the laws of the State of California and
      registered under the Bank Holding Company Act of 1956, as amended (the
      "BHC Act").  Westamerica's banking subsidiaries, Westamerica Bank, Napa
      Valley Bank and Bank of Lake County, are California state-chartered banks
      insured by the Federal Deposit Insurance Corporation (the "FDIC").
      Westamerica Bank is also a member of the Federal Reserve System.
      Westamerica's subsidiary banks presently operate 48 banking offices in
      eleven counties in Northern California.  Westamerica's subsidiary,
      Community Banker Services Corporation ("CBSC"), provides centralized
      services to Westamerica's banking subsidiaries.  CBSC's subsidiary,
      Weststar Mortgage Corporation, a California corporation, also conducts
      mortgage servicing activities.  Westamerica also owns all of the capital
      stock of Westcore, an inactive California corporation ("Westcore").  The
      Federal Reserve Bank of San Francisco recently approved Westamerica's
      application to commence an employee benefit consulting business through
      Westcore.

         Westamerica, PV Financial, a bank holding company headquartered in
      Modesto, California with approximately $173 million in assets at September
      30, 1994 ("PV Financial"), and PV Financial's banking subsidiary, Pacific
      Valley National Bank, a national banking association ("Pacific Valley
      National Bank"), have entered into an Agreement and Plan of Reorganization
      (as amended) dated as of July 25, 1994, whereby the parties thereto agreed
      to merge PV Financial into Westamerica (the "PV Financial Merger") and
      Pacific Valley National Bank into Westamerica Bank.  The PV Financial
      Merger has received the approval of the PV Financial shareholders and the
      Board of Governors of the Federal Reserve System and, subject to
      satisfaction of certain other conditions, is presently anticipated to be
      consummated in the first quarter of 1995.

         On December 8, 1994, Westamerica, North Bay Bancorp, a bank holding
      company headquartered in Novato, California, with approximately $108
      million in assets at September 30, 1994 ("North Bay"), and North Bay's
      banking subsidiary, Novato National Bank, a national banking association
      ("Novato National Bank"), entered into an Agreement and Plan of
      Reorganization dated as of December 8, 1994, whereby the parties thereto
      agreed to merge North Bay into Westamerica (the "North Bay Merger").  The
      North Bay Merger is subject to regulatory and shareholder approval, and
      the satisfaction of certain other conditions.  It is anticipated that
      shortly after completion of the North Bay Merger, Novato National Bank
      will be merged with and into Westamerica Bank.

         At September 30, 1994, Westamerica had consolidated assets of
      approximately $2.05 billion, deposits of approximately $1.71 billion and
      shareholders' equity of approximately $163 million.  Westamerica's
      principal executive offices are located at 1108 Fifth Avenue, San Rafael,
      California 94901, and Westamerica's telephone number at that location is
      (415) 257-8000.

         CapitolBank is a California state-chartered bank, headquartered in
      Sacramento, California.  At September 30, 1994, CapitolBank had
      consolidated assets of approximately $138 million, deposits of
      approximately $126 million and shareholders' equity of approximately $9
      million. CapitolBank's principal executive offices are located at 300
      Capitol Mall, Sacramento, California 95814, and CapitolBank's telephone
      number at that location is (916) 449-8300.

                                      -4-
<PAGE>
 
      The Meeting and Vote Required

         The Meeting (including any adjournments or postponements thereof) will
      be held at 300 Capitol Mall, Sacramento, California, on February 23, 1995,
      at 5:00 p.m., local time.  At the Meeting, holders of CapitolBank Common
      Stock will consider and vote upon a proposal to adopt and approve the
      Agreements, the Merger and the transactions contemplated thereby.  Only
      holders of record of CapitolBank Common Stock at the close of business on
      January 13, 1995 (the "Record Date") will be entitled to notice of, and to
      vote at, the Meeting.  See "The Meeting."

         The approval of the Merger by the CapitolBank shareholders will
      constitute approval and adoption of the Agreements, the Merger and each of
      the transactions contemplated thereby as more fully described herein.  The
      affirmative vote of the holders of a majority of the outstanding shares of
      CapitolBank Common Stock entitled to vote at the Meeting is required to
      approve and adopt the Agreements, the Merger and the transactions
      contemplated thereby.  Such approval is a condition to, and required for,
      consummation of the Merger.  See "The Meeting" and "The Merger--
      Representations and Warranties; Conditions to the Merger."

         As of the Record Date, there were 4,080,302 shares of CapitolBank
      Common Stock outstanding, of which 1,029,459 shares were beneficially
      owned by directors of CapitolBank and their respective affiliates.  The
      directors of CapitolBank have agreed to vote the shares of CapitolBank
      Common Stock held by them (which includes all shares as to which the
      directors have sole or shared voting power) for the approval of the
      Merger.  To Westamerica's knowledge, as of the Record Date, directors and
      executive officers of Westamerica did not beneficially own any shares of
      CapitolBank Common Stock.  Accordingly, approval of the Merger at the
      Meeting is expected to require the affirmative vote of an additional
      1,010,693 shares of CapitolBank Common Stock outstanding on the Record
      Date voted by the remaining shareholders of CapitolBank.

         Approval of the Merger by Westamerica's shareholders is not required.

         A CapitolBank shareholder giving a Proxy has the power to revoke that
      Proxy prior to its exercise.  See "The Meeting--Matters to be Considered
      at the Meeting."


      Certain Considerations

         See "Certain Considerations" for a discussion of certain factors that
      should be carefully considered by CapitolBank shareholders in deciding
      whether to vote for approval of the Merger.  Such section discusses the
      Tyler v. Wickland lawsuit, Westamerica Shares eligible for future sale
      which may have a dilutive effect, interests of certain persons in the
      Merger, real estate lending activities, organizational structure and
      management, operations after the merger, the effect of the Westamerica
      shareholder rights plan and the legislative and regulatory environment.

         Certain directors of CapitolBank are defendants in a lawsuit, Tyler v.
      Wickland.  The potentially uninsured expenses of this lawsuit could 
      adversely affect the Exchange Ratio or cause a termination of the 
      Agreements.  See "The Merger--Possible Adjustments to Exchange Ratio or 
      Termination of the Agreement;" "--Representations and Warranties; 
      Conditions to the Merger;" and "--Regulatory Approvals."

         CapitolBank's Vice Chairman and Chief Executive Officer and President
      and Chief Operating Officer are parties to employment agreements with
      CapitolBank which provide that, in the event that such officers are
      terminated upon a reorganization of CapitolBank, CapitolBank shall be
      obligated to pay, among other things, their respective salaries through
      the date of termination, any bonus which was earned but not paid on the
      date of such termination and pay $150,000 to the Chief Executive Officer
      and $125,000 to the Chief Operating Officer, the equivalent of one year's
      salary for each.

         In addition, pursuant to their employment agreements, the Chief
      Executive Officer and the Chief Operating Officer were granted options to
      purchase shares of CapitolBank Common Stock exercisable at $1.50 per
      share. CapitolBank intends to permit the officers' options to vest
      immediately upon the Merger.

         CapitolBank maintains a directors' and officers' liability insurance
      policy covering all its directors and certain executive officers and has
      entered into separate indemnification agreements with each director and
      certain executive officers. See "Certain Differences in Rights of
      Shareholders -- Indemnification of Directors and Executive Officers."
      Pursuant to the Agreement, the CapitolBank directors and officers may
      obtain insurance coverage for claims made within one year after the
      Effective Date, arising from facts or events (other than Tyler v.
      Wickland) which occurred prior to such date. The ability of CapitolBank's
      directors and officers to obtain extended insurance coverage may be
      affected based upon whether CapitolBank's current policy is rescinded. See
      "Certain Considerations -- Tyler v. Wickland." Upon the merger of
      CapitolBank into Westamerica Bank, Westamerica Bank shall be deemed to
      assume the liabilities of CapitolBank under its director and officer
      indemnification agreements and shall be responsible and liable for all the
      liabilities and obligations of CapitolBank. See "Certain Considerations --
      Interests of CapitolBank Officers and Directors in the Merger."

      Reasons for the Merger; Recommendation of the Board of Directors

         The Board of Directors of CapitolBank believes that the Merger is in
      the best interests of the shareholders of CapitolBank and offers the best
      opportunity available for shareholders of CapitolBank to realize the value
      of their CapitolBank shares.

                                      -5-
<PAGE>
 
         In evaluating the recommendations of CapitolBank's Board of Directors,
      shareholders of CapitolBank should carefully consider the matters
      described under "Certain Considerations," "The Merger--Background of the
      Merger" and "--Reasons for the Merger; Recommendation of the Board of
      Directors."


      Opinions of Financial Advisors

         Each of CapitolBank's investment advisors has concluded that the
      Exchange Ratio, as it may be adjusted pursuant to the Agreement, is fair
      from a financial point of view to CapitolBank's shareholders.

         The texts of the fairness opinions, which set forth certain assumptions
      made, matters considered and limits on the review undertaken by Hoefer &
      Arnett Incorporated ("Hoefer") and Smith & Crowley Inc. ("Smith &
      Crowley") are attached to this Proxy Statement/Prospectus as Annexes B and
      C, respectively. CapitolBank shareholders are urged to read the fairness
      opinions in their entirety. The Agreement does not require that such
      fairness opinions be updated prior to the Effective Date. See "The 
      Merger--Opinions of CapitolBank's Financial Advisors," which also contains
      a discussion of the fees to be paid to Hoefer and Smith & Crowley. A
      significant portion of the fees to be paid to Hoefer are generally
      contingent upon consummation of the Merger.


      Effective Date of the Merger

         The Merger will be effective upon the date of the filing with the
      California Secretary of State of a duly executed Merger Agreement and the
      officers' certificates prescribed by Section 1103 of the California
      General Corporation Law (the "GCL") or upon any subsequent date specified
      in the Merger Agreement (the "Effective Time").  The date on which the
      Merger is effective as specified in the Merger Agreement is referred to
      herein as the "Effective Date."


      Exchange Ratio; Possible Adjustments to Exchange Ratio

         On the Effective Date, each issued and outstanding share of CapitolBank
      Common Stock (except for fractional shares and shares as to which
      dissenters' rights have been perfected) shall be converted into .0938 of a
      share (the "Exchange Ratio") of Westamerica Common Stock. Based on a
      closing price of Westamerica Common Stock of $_____ on January ___, 1995
      (and assuming this is the Average Price, as defined below) the Exchange
      Ratio would be .____ (the equivalent of $____ per share of CapitolBank
      Common Stock) if there is not an adjustment for Significant Liabilities,
      as defined below and .____ if the maximum adjustment for Significant
      Liabilities occurs.

         If, as of two business days preceding the Effective Date, the average
      of the closing price of Westamerica Common Stock quoted on NNM (calculated
      by taking an average of the closing prices quoted on NNM as reported in
      The Wall Street Journal on each of the twenty consecutive trading days
      prior to two business days prior to the Effective Date, rounded to four
      decimal places, whether or not trades occurred on those days) (the
      "Average Price") is below $30.20, CapitolBank may accept the Exchange
      Ratio as adjusted for any Significant Liabilities, or Westamerica and
      CapitolBank shall have the right but not the obligation to renegotiate the
      Exchange Ratio.  Should CapitolBank fail to accept the Exchange Ratio as
      described in the preceding sentence or should the parties fail to
      renegotiate the Exchange Ratio, CapitolBank may terminate the Agreement.

         The Exchange Ratio will be adjusted downward for any Significant
      Liabilities if in the aggregate these Significant Liabilities total more
      than $150,000.  As of the date hereof, certain expenses and costs
      associated with bonuses payable to CapitolBank employees and the Tyler v.
      Wickland litigation which would constitute Significant Liabilities
      totaled approximately $280,000.  See "Certain Considerations--Tyler v.
      Wickland."  "Significant Liabilities" means those liabilities or expenses
      (whether operating or capital in nature) relating to those categories and
      events described in the next sentence which have not been reflected as
      reductions to CapitolBank's consolidated book value pursuant to generally
      accepted accounting principles as of September 30, 1994; provided,
      however, that any individual component of the $150,000 aggregate amount
      must reasonably be estimated to exceed 

                                      -6-
<PAGE>
 
      $25,000. Significant Liabilities consists of the following categories or
      events to which Westamerica has not consented in writing: (i) new or
      extended contractual obligations; (ii) new or extended leases of real or
      personal property; (iii) acquisition of capital assets (or commitments to
      do so); (iv) new or expanded contingent liabilities based upon threatened
      or pending litigation or other proceedings or hazardous or toxic
      substances and legal fees and costs (whether actual or estimated) related
      thereto; (v) any expenses, fines, fees, penalties or similar obligations,
      except those which arose in the Ordinary Course of Business (as defined in
      the Agreement); (vi) any new, expanded or accelerated pension or other
      benefits including employment contracts and severance payments, whether or
      not vested; and (vii) the aggregate amount of the difference between the
      per share exercise price of any stock options or stock appreciation rights
      granted after June 30, 1994, by CapitolBank and $3.00.

         The amount of Significant Liabilities in the case of the arrangements
      described in (i), (ii), and (vi) above will equal (a) any payment that
      could be made as of the Effective Date that would terminate the
      arrangement without further liability or expense to CapitolBank or
      Westamerica, or (b) if the arrangement does not provide for such a
      payment, the present value of the amount of the remaining payments payable
      pursuant to the arrangement after the Effective Date using a discount rate
      equivalent to Westamerica's then current cost of funds.  The amount of
      Significant Liabilities in the case of (iii) above will equal the amount
      expended or required to be expended under binding commitments for a
      capital asset, minus the amount for which the capital asset could actually
      be sold on a liquidation basis.  Significant Liabilities do not include
      fees of CapitolBank's financial advisors or CapitolBank's legal fees
      directly attributable to this Merger.  Significant Liabilities shall not
      include approximately $200,000 already accrued for CapitolBank's 1994
      bonus pool, approximately $140,000 for CapitolBank's employee retention
      contracts and certain amounts payable to Thayer T. Prentice and William J.
      Martin totaling $150,000 and $125,000, respectively, pursuant to their
      respective employment agreements with CapitolBank.  As a result of any
      Significant Liabilities through the close of business on the day preceding
      the Effective Date, the Exchange Ratio shall be reduced by an amount
      calculated as follows, provided that not more than $1,000,000 of such
      Significant Liabilities shall be taken into account:

                                   (Significant Liabilities)
                          .0938 -  -------------------------
                                         $130 Million

           If the Average Price is above $33.00, the Exchange Ratio, as adjusted
      for any Significant Liabilities, will be decreased by one-half of the
      amount by which the Average Price is above $33.00, according to a formula
      provided in the Agreement.  Shareholders are urged to carefully review the
      description of the Merger under the captions "The Merger--Exchange Ratio;
      Conversion of Shares of CapitolBank Common Stock" and "--Possible
      Adjustments to Exchange Ratio or Termination of the Agreement" and the
      Agreements attached as Annex A hereto.

           Immediately following consummation of the Merger, based on the number
      of shares of Westamerica Common Stock and CapitolBank Common Stock
      outstanding on the Record Date, the former shareholders of CapitolBank
      will hold approximately 4% of the shares of the issued and outstanding
      common stock of Westamerica assuming the Exchange Ratio remains at .0938.
      Each share of Westamerica Common Stock issued and outstanding immediately
      prior to consummation of the Merger will remain outstanding and unchanged
      as a result of the Merger.  See "The Merger--Exchange Ratio; Conversion of
      Shares of CapitolBank Common Stock."

      Treatment of Stock Options

           As of September 30, 1994, options to purchase 319,167 shares of
      CapitolBank Common Stock are outstanding under the CapitolBank Sacramento
      1992 Stock Option Plan (the "CapitolBank Stock Option Plan"). Following
      the Effective Date, any then outstanding and unexercised options under the
      CapitolBank Stock Option Plan will be replaced by options for shares of
      Westamerica Common Stock in accordance with the terms of the Agreement.
      The Agreement provides that, following the Effective Date, all outstanding
      options under the CapitolBank Stock Option Plan will be replaced by
      options for an equivalent number of shares of Westamerica Common Stock
      with an equivalent exercise price, calculated in accordance with the
      Exchange Ratio, but otherwise on terms and conditions that are consistent
      with the terms and conditions of the existing CapitolBank Stock Option
      Plan options. See "The Merger--Treatment of Stock Options."

                                      -7-
<PAGE>
 
      Conditions and Regulatory Approvals

           The respective obligations of Westamerica and CapitolBank to effect
      the Merger are subject to various conditions described in "The Merger--
      Representations and Warranties; Conditions to the Merger."

           The Merger will occur only if all required governmental approvals are
      in effect or have been obtained (without the imposition of any materially
      burdensome conditions as determined by Westamerica in its reasonable
      judgment), the Agreements are approved by the majority of the outstanding
      shares of CapitolBank Common Stock, and the representations and warranties
      of the parties are true and correct in all material respects on and as of
      the Effective Date and certain other conditions are satisfied.

           Consummation of the Merger is subject to satisfaction of certain
      other conditions or the waiver of such conditions by the party entitled to
      do so.  Such conditions include, among other things, the following:  (i)
      the absence of a material adverse change since December 31, 1993, in the
      business, financial condition or results of operations of either party;
      (ii) the receipt of a letter from legal counsel to CapitolBank to the
      effect that CapitolBank will be reimbursed for expenses and other costs
      arising out of the Tyler v. Wickland lawsuit by its directors' and
      officers' liability insurer as discussed below; (iii) the absence of
      significant legal impediments to the Merger; (iv) the effectiveness of a
      registration statement with respect to the Westamerica Shares to be issued
      to former shareholders of CapitolBank as a result of the Merger; (v) the
      receipt of a tax opinion or ruling to the effect that, among other things,
      under federal and state tax laws, the Merger will not result in any
      unrecognized gain or loss to Westamerica or CapitolBank and, except for
      cash received in lieu of fractional shares or in payment pursuant to the
      exercise of dissenters' rights, no gain or loss will be recognized by
      holders of CapitolBank Common Stock who receive Westamerica Common Stock
      in exchange for the CapitolBank Common Stock which they hold; (vi) receipt
      of letters and reports from CapitolBank's independent public accountants
      relating to a registration statement; (vii) receipt by CapitolBank of a
      fairness opinion from each of its financial advisors; and (viii) receipt
      of a letter from Westamerica's independent public accountants to the
      effect that the Merger will qualify for the pooling of interests method of
      accounting in accordance with generally accepted accounting principles.

           Based on circumstances existing at the date hereof, legal counsel to
      CapitolBank would be unable to issue a letter to the effect that
      CapitolBank will be reimbursed for expenses and other costs arising out of
      the Tyler v. Wickland lawsuit by its directors' and officers' liability
      insurer. See "Certain Considerations--Tyler v. Wickland."

           In addition, certain other conditions must be satisfied, or must be
      waived by Westamerica, in order for Westamerica to be obligated to
      consummate the Merger, including but not limited to the conditions that
      (i) the aggregate number of shares of CapitolBank's Common Stock held by
      persons who have taken all of the steps required to perfect their right
      (if any) to be paid the fair market value of such shares as dissenting
      shares under the GCL shall not exceed 9% of the outstanding shares of
      CapitolBank Common Stock; (ii) CapitolBank has received all consents of
      third parties which are required to be received by it, if any; and (iii)
      at the month end immediately preceding the Effective Date and two days
      prior to the Effective Date, the percentage determined by dividing
      Classified Loans (as defined in the Agreement) by the sum of equity
      capital plus reserves for loan losses as of December 31, 1994 shall not be
      greater than 42%.


      Stock Option Agreement

           Immediately following the execution of the Agreement, CapitolBank, as
      a condition to, and in consideration for entering into, the Agreement,
      granted Westamerica an option, exercisable only in the event certain
      triggering events occur, to purchase 9.9% of the outstanding shares of
      CapitolBank Common Stock without giving effect to the issuance of shares
      pursuant to an exercise of such stock option and which, as of the Record
      Date, would involve the issuance of 403,949 fully paid and nonassessable
      shares of CapitolBank Common Stock at an exercise price of $2.27 per
      share.  See "The Merger--Stock Option Agreement."

                                      -8-
<PAGE>
 
      Noncompetition Agreements

           As a condition to consummation of the Merger under the Agreement, the
      nonemployee directors of CapitolBank (collectively, the "Directors") have
      each entered into a noncompetition agreement (collectively, the
      "Noncompetition Agreements") with Westamerica. Pursuant to the
      Noncompetition Agreements signed by J. Al Wickland, Jr. and John A.
      Wickland III, those Directors are not permitted, without Westamerica's
      written consent, to engage in activities which are similar to the
      activities of Westamerica, Westamerica Bank or CapitolBank within
      Sacramento County in the State of California. The Noncompetition
      Agreements signed by each of the other nonemployee Directors provide that
      each such Director will not engage in soliciting or making loans to or
      attracting or soliciting insured financial institution deposits from
      customers or otherwise contacting individuals or entities doing business
      with CapitolBank. The Noncompetition Agreements expire two years after the
      Effective Date.

           In addition, each of the Noncompetition Agreements requires the
      Directors to treat as confidential all information concerning the records,
      properties, books, contracts, commitments and affairs of Westamerica,
      CapitolBank or their respective subsidiaries, even if a Noncompetition
      Agreement is terminated.  See "The Merger--Noncompetition Agreements."


      Certain Tax Consequences

           It is anticipated that the principal federal income tax consequences
      of the Merger will be as follows: (a) the Merger will be part of a
      reorganization within the meaning of Section 368(a) of the Internal
      Revenue Code of 1986, as amended; (b) no gain or loss will be recognized
      by the shareholders of CapitolBank who receive Westamerica Common Stock in
      exchange for the CapitolBank Common Stock which they hold, except in
      respect of cash received for fractional shares; (c) the holding period of
      the Westamerica Common Stock in the hands of the former CapitolBank
      shareholders will generally include the holding period of their exchanged
      CapitolBank Common Stock; and (d) the tax basis of the shares of
      Westamerica Common Stock received by the shareholders of CapitolBank will
      be the same as the tax basis of their exchanged CapitolBank Common Stock.
      In order to satisfy one of the conditions to consummation of the Merger
      (see "The Merger--Representations and Warranties; Conditions to the
      Merger"), Westamerica and CapitolBank each expects to receive an opinion
      of Westamerica's legal counsel to the effect that the Merger will have the
      foregoing and certain other tax consequences. For a detailed discussion of
      the income tax consequences of the Merger, see "The Merger--Certain Tax
      Consequences." CapitolBank shareholders should consult their personal tax
      advisors as to the consequences of the Merger to them under United States
      federal, state or local law, or applicable foreign tax laws.


      Amendment and Termination

           The Agreement may be amended by Westamerica and CapitolBank at any
      time prior to the Effective Date without the approval of the shareholders
      of Westamerica or the shareholders of CapitolBank with respect to any of
      its terms except the terms relating to the form or amount of consideration
      to be delivered to the CapitolBank shareholders in the Merger.  The
      Agreements may be terminated by the mutual consent of the Boards of
      Directors of both Westamerica and CapitolBank at any time prior to the
      consummation of the Merger.

           The Agreements may be terminated by Westamerica as follows:  (i) on
      or after July 31, 1995, if (A) any of the conditions to which the
      obligations of Westamerica are subject has not been fulfilled, or (B) such
      conditions have been fulfilled or waived by Westamerica and CapitolBank
      shall have failed to complete the Merger; (ii) if (A) Westamerica has
      become aware of any facts or circumstances of which it was not aware on
      the date of the Agreement and which materially adversely affect
      CapitolBank or its properties, operations, financial condition or
      prospects, (B) a materially adverse change shall have occurred since
      December 31, 1993, in the business, financial condition, results of
      operations, properties or prospects of CapitolBank, (C) there has been a
      failure (including any anticipatory breach) on the part of CapitolBank to
      comply with its obligations under the Agreements, or any failure

                                      -9-
<PAGE>
 
      (including any anticipatory breach) to comply with any of the conditions
      to closing set forth in Section 7 of the Agreement, or (D) based on the
      continuing fiduciary duties of the CapitolBank Board of Directors to the
      shareholders of CapitolBank, CapitolBank fails to act or refrains from
      doing any act required of CapitolBank pursuant to the Agreement as a
      result of a bona fide offer for a Business Combination (as such term is
      defined in the Agreement); (iii) if Westamerica determines that it would
      be inadvisable or inexpedient to continue to carry out the terms of, or to
      attempt to consummate, the Merger by reason of any significant legal
      impediment to the Merger having arisen, or any material pending or
      threatened litigation, investigation or proceeding; or (iv) if any person
      (other than Westamerica or any subsidiary thereof) shall become the
      beneficial owner of 20% or more of the then outstanding shares of
      CapitolBank or any person (other than Westamerica or a subsidiary thereof)
      shall have commenced a bona fide tender offer or exchange offer to acquire
      at least 20% of the then outstanding shares of CapitolBank.

           The Agreements may be terminated by CapitolBank as follows:  (i) on
      or after July 31, 1995, if (A) any of the conditions to which the
      obligations of CapitolBank are subject have not been fulfilled, or (B)
      such conditions have been fulfilled or waived but Westamerica shall have
      failed to complete the Merger; provided, however, that if Westamerica is
      engaged at the time in litigation relating to an attempt to obtain one or
      more of the government approvals which are required to consummate the
      Merger or if Westamerica shall be contesting in good faith any litigation
      which seeks to prevent consummation of the Merger, such nonfulfillment
      shall not give CapitolBank the right to terminate the Agreements until the
      earlier of (X) 12 months after the date of the Agreement or (Y) 60 days
      after the completion of such litigation and of any further regulatory or
      judicial action pursuant thereto; or (ii) if on or before the Effective
      Date (A) CapitolBank has become aware of any facts or circumstances of
      which it was not aware on November 17, 1994 and which can or do materially
      adversely affect Westamerica and its subsidiaries (taken as a whole) or
      its properties, operations or financial condition, (B) a materially
      adverse change shall have occurred since December 31, 1993, in the
      business, financial condition, results of operations or assets of
      Westamerica and its subsidiaries (taken as a whole), (C) there has been
      failure (including any anticipatory breach) on the part of Westamerica to
      comply with its obligations under the Agreements or any failure (including
      any anticipatory breach) to comply with any condition set forth in Section
      8 of the Agreement, or (D) Westamerica shall make any offer to any third
      party or accept any offer from any third party regarding a Business
      Combination (as such term is defined in the Agreement) of Westamerica with
      any other entity that is not conditioned upon performance by Westamerica
      or its successor of the obligations of Westamerica under the Agreement, or
      (iii) the Average Price of Westamerica Common Stock is less than $30.20
      during the specified 20 business day period prior to the Effective Date.


      Expenses

           Westamerica and CapitolBank have each agreed to pay their own costs
      incurred incident to the performance of their obligations under the
      Agreements.  See "The Merger--Expenses" and "--Amendment; Termination."


      Accounting Treatment

           The Merger is expected to be accounted for as a pooling of interests,
      and it is a condition to Westamerica's obligation to consummate the Merger
      that Westamerica shall have received a letter from KPMG Peat Marwick LLP,
      Westamerica's independent public accountants, to the effect that the
      Merger will qualify for such accounting treatment.  Among other things,
      the Agreement provides that in the event the holders of 9% or more of the
      shares of CapitolBank Common Stock outstanding immediately prior to the
      Effective Date are then seeking to perfect dissenters' rights under the
      GCL with respect to such shares, the Merger will not be consummated if
      Westamerica is unable to receive, as a result of such action, a letter
      from its accountants to the effect that the Merger will qualify for
      pooling of interests accounting treatment.  See "The Merger--
      Representations and Warranties; Conditions to the Merger" and 
      "--Accounting Treatment."

                                      -10-
<PAGE>
 
      Dissenters' Rights of Appraisal

           Shareholders of CapitolBank Common Stock who exercise dissenters'
      rights with respect to the Merger in accordance with the statutory
      procedures prescribed in the GCL may be entitled to receive cash for their
      stock if such shareholders did not vote "FOR" approval and adoption of the
                                     ---                                        
      Agreements and the transactions contemplated thereby and otherwise act to
      perfect their rights as dissenting shareholders pursuant to the GCL.  For
      a description of dissenters' rights under the GCL and the method of
      perfecting such rights, see "The Meeting" and "Dissenters' Rights of
      Appraisal."


      Market Price and Dividend Data

           Westamerica Common Stock is listed and traded on NNM under the symbol
      "WABC."  CapitolBank Common Stock is traded in the over-the-counter market
      and quoted on the "pink sheets" published by the National Quotation
      Bureau, Inc. (the "Pink Sheets").

           The following table sets forth the average of the last reported bid
      and asked price per share for CapitolBank Common Stock as quoted on the
      Pink Sheets and the last reported sales price of Westamerica Common Stock
      on NNM, on November 17, 1994, the trading date prior to the public
      announcement of the Merger, and on _________, 1995, the latest practicable
      trading day before the printing of this Proxy Statement/Prospectus, and
      equivalent per share prices for CapitolBank Common Stock based on the
      prices of Westamerica Common Stock.

<TABLE> 
<CAPTION> 
                                                                 Equivalent
                                          Market Value            Pro Forma
                                           Per Share           Market Value(1)
                                   --------------------------  ---------------
                                    Historical    Historical
                                   CapitolBank    Westamerica    CapitolBank
                                   -----------    -----------  ---------------
      <S>                             <C>           <C>             <C> 
Last Trade Prior to:      
         November 17, 1994.......      $1.88        $30.50          $2.86
         ___________, 1995.......
</TABLE> 
- -----------------------------------

(1)  The equivalent pro forma market value per share of CapitolBank Common Stock
     represents the last reported sales price per share of Westamerica Common
     Stock multiplied by the Exchange Ratio of .0938. The Exchange Ratio is
     subject to adjustment as provided in the Agreement. See "The Merger--
     Possible Adjustments to Exchange Ratio or Termination of the Agreement."

     Following the Merger, no shares of CapitolBank Common Stock will be
outstanding, and Westamerica Common Stock will continue to be traded on NNM.

     Westamerica has paid quarterly cash dividends since it commenced
operations on January 1, 1973. Westamerica's Board of Directors considers the
advisability and amount of proposed dividends each quarter. Westamerica's
primary source of funds for the payment of dividends is its principal banking
subsidiary, Westamerica Bank, whose ability to pay dividends to Westamerica is
subject to various legal and regulatory restrictions. See "Market Price and
Dividend Information--Dividends and Dividend Policy." Westamerica is subject to
certain restrictions on its ability to pay dividends under the terms of certain
of its debt agreements. See "Description of Westamerica Capital Stock and
Indebtedness--Debt Agreements."

     CapitolBank was incorporated in 1975 and has not paid dividends since
1981. The ability of CapitolBank to pay dividends is subject to various legal
and regulatory restrictions, and CapitolBank is currently prohibited from paying
dividends. See "Market Price and Dividend Information--Dividends and Dividend
Policy."

                                      -11-
<PAGE>
 
Differences in Applicable Law and Rights of Shareholders

     Westamerica and CapitolBank are both organized under the GCL and
while similarities in rights exist for shareholders of Westamerica and
CapitolBank, there are significant differences in the laws applicable to each
company and in their respective charter documents. The primary difference is
that Westamerica is a bank holding company which principally operates within the
framework of the BHC Act and is regulated by the Federal Reserve System, while
CapitolBank is a commercial bank which operates within the framework of the
California Financial Code and the Federal Deposit Insurance Act. CapitolBank's
primary regulators are the California Superintendent of Banks and the FDIC. See
"Certain Considerations--Legislative and Regulatory Environment," and "Certain
Differences in Rights of Shareholders."


Selected Historical and Pro Forma Financial Data

     The following tables present selected historical and pro forma combined
consolidated financial information for Westamerica and CapitolBank. The
following financial data should be read in conjunction with the historical
consolidated financial statements, the unaudited interim historical consolidated
financial statements, and the unaudited pro forma combined consolidated
financial information and the notes to such statements, certain of which are
included elsewhere in this Proxy Statement/Prospectus or incorporated by
reference herein. The unaudited pro forma combined financial information
presents selected financial information based on the historical financial
statements of the parties, giving effect to the proposed Merger under the
pooling of interests method of accounting and the assumptions and adjustments
described in the notes thereto. See "Pro Forma Combined Financial Information."
The unaudited pro forma combined and pro forma equivalent financial statements
do not indicate the results or financial position that would have occurred if
the Merger had been in effect on the dates or for the periods indicated or that
may occur in the future.

                                      -12-
<PAGE>
 
                     Westamerica, PV Financial and North Bay
            Unaudited Historical Consolidated Financial Information
<TABLE>
<CAPTION>
 
                                             Nine Months Ended
                                               September 30,                           Year Ended December 31,
                                         ------------------------  ----------------------------------------------------------------
                                            1994         1993         1993         1992         1991          1990         1989
                                         -----------  -----------  -----------  -----------  -----------  ------------  -----------
<S>                                      <C>          <C>          <C>          <C>          <C>          <C>           <C>
                                                              (In thousands, except ratios and per share data)
Results of operations:
 Interest income.......................  $  117,636   $  119,151   $  158,155   $  175,686   $  202,589    $  214,036   $  206,059
 Interest expense......................      34,900       37,451       48,671       66,764       98,587       111,154      105,153
 Net interest income...................      82,735       81,700      109,484      108,922      104,002       102,882       99,906
 Provision for loan losses.............       5,149        8,567       10,431        8,015       11,578         8,663        8,588
 Noninterest income....................      16,571       20,929       26,828       26,713       26,454        25,258       21,466
 Noninterest expense...................      64,247       86,891      109,755      103,660       98,044        93,559       92,530
 Net income............................      20,285        5,512       11,728       14,993       13,806        18,010       14,111
 
Balance sheet (end of period):
 Total assets..........................  $2,363,042   $2,301,416   $2,304,969   $2,261,331   $2,262,481    $2,204,474   $2,147,032
 Net loans.............................   1,283,539    1,290,381    1,294,340    1,340,721    1,420,029     1,452,186    1,419,006
 Deposits..............................   1,993,432    2,000,144    2,000,338    2,040,633    2,053,357     1,976,076    1,949,953
 Other borrowed funds..................     134,824       73,533       71,798       14,559       13,375        38,589       24,853
 Shareholders' equity..................     191,131      171,664      179,144      168,451      154,443       143,169      128,171
 
Financial ratios:
 Total capital to
  risk-adjusted assets.................       14.81%       12.27%       14.19%       12.25%       11.10%        10.79%        9.52%
 Tier 1 capital to average
  total assets.........................        8.20         7.64         7.80         7.64         7.01          6.59         6.33
 Reserve for loan losses to
  total loans..........................        2.37         2.15         2.18         2.01         1.84          1.47         1.27
 Return on average assets..............        1.16         0.33         0.52         0.67         0.63          0.83         0.70
 Return on average equity..............       14.78         4.37         6.88         9.36         9.20         13.37        12.22
 Nonperforming assets to
  total assets.........................        1.03         1.61         1.31         2.42         2.54          1.94         1.43
 
Per share:
 Net income............................  $     2.10   $     0.57   $     1.21   $     1.58   $     1.47    $     1.94   $     1.54
 Book value............................  $    19.81   $    17.82   $    18.58   $    17.73   $    16.70    $    15.63   $    14.08
 Average shares outstanding............       9,643        9,605        9,656        9,486        9,384         9,264        9,155
</TABLE>

                                      -13-
<PAGE>
 
                                  CapitolBank
            Unaudited Historical Consolidated Financial Information
<TABLE>
<CAPTION>
 
                                          Nine Months Ended
                                            September 30,                     Year Ended December 31,
                                        --------------------  ------------------------------------------------------
                                           1994       1993       1993       1992        1991        1990       1989
                                        ---------  ---------  ---------  ----------  ---------  ---------  ---------
                                                       (In thousands, except ratios and per share data)     
<S>                                     <C>        <C>        <C>        <C>         <C>        <C>        <C>
      Results of operations:                                                            
        Interest income...............  $  7,500   $  6,622   $  8,951    $  9,125    $ 12,488   $ 13,290   $ 11,363
        Interest expense..............     1,868      2,037      2,671       3,281       5,337      6,453      5,609
        Net interest income...........     5,632      4,585      6,280       5,844       7,151      6,837      5,754
        Provision for loan losses.....       285        336        436         520       1,067        525        250
        Noninterest income............       778        975      1,213       1,290       1,671      2,121      1,222
        Noninterest expense...........     5,789      5,034      6,663       8,478       7,473      6,693      5,744
        Net income (loss).............       281        164        315      (1,864)        211      1,656        956
                                                                                     
      Balance sheet (end of period):                                                 
        Total assets..................  $137,969   $122,598   $123,393    $119,946    $148,762   $150,448   $129,845
        Net loans.....................    87,511     75,365     74,503      63,228      68,618     80,683     61,168
        Deposits......................   126,026    110,751    111,063     108,188     133,621    135,404    117,292
        Other borrowed funds..........     1,719      2,338      2,734       2,521       3,805      3,490      2,871
        Shareholders' equity..........     9,272      9,066      9,217       8,902      10,766     10,555      8,899
                                                                                     
      Financial ratios:                                                              
        Total capital to                                                             
         risk-adjusted assets.........     11.04%     12.38%     12.90%      14.58%      13.97%     12.84%     10.22%
        Tier 1 capital to average                                                    
         total assets.................      6.93       7.37       7.55        7.18        7.89       7.67       7.54
        Reserve for loan losses to                                                   
         total loans..................      2.01       1.72       1.83        1.80        1.61       1.42       1.29
        Return on average assets......      0.20       0.13       0.26       (1.50)       0.16       1.21       0.82
        Return on average equity......      3.03       2.11       3.57      (21.66)       1.95      18.29      11.65
        Nonperforming assets to                                                      
         total assets.................      1.64       0.72       1.10        2.98        2.36       1.63       2.29
                                                                                     
      Per share:                                                                     
        Net income (loss).............  $   0.07   $   0.04   $   0.08    $  (0.46)   $   0.05   $   0.41   $   0.23
        Book value....................  $   2.27   $   2.22   $   2.26    $   2.18    $   2.64   $   2.59   $   2.18
        Average shares outstanding....     4,080      4,080      4,080       4,080       4,080      4,080      4,080
</TABLE>

                                      -14-
<PAGE>
 
              Westamerica, PV Financial, North Bay and CapitolBank 
        Unaudited Pro Forma Combined Consolidated Financial Information
<TABLE>
<CAPTION>
 
                                                                        
                             Nine Months Ended                                       
                               September 30,                                  Year Ended December 31,
                         ------------------------      ---------------------------------------------------------------------
                          1994(1)        1993(1)        1993(1)        1992(1)        1991(1)        1990(1)        1989(1)
                         ---------      ---------      ---------      ---------      ---------      ---------      ---------
                                                  (In thousands, except ratios and per share data)
<S>                    <C>            <C>            <C>            <C>            <C>            <C>            <C>
Results of
operations:
  Interest income....  $  122,782     $  124,260     $  164,943     $  184,100     $  212,171     $  223,731     $  213,317
  Interest expense...      36,664         39,328         51,157         69,951        103,233        116,249        109,515
  Net interest income      86,118         84,932        113,786        114,149        108,938        107,482        103,802
  Provision for loan
   losses............       5,229          8,717         10,581          8,410         12,201          9,023          8,807
  Noninterest income.      20,330         26,233         34,863         31,710         29,283         26,279         22,238
  Noninterest expense      70,857         95,134        121,466        111,765        103,516         97,542         96,142
  Net income (loss)..      20,567          5,612         12,024         16,040         14,762         18,780         14,638

Balance sheet (end
 of period):
  Total assets.......  $2,470,602     $2,417,271     $2,428,848     $2,377,028     $2,366,830     $2,299,216     $2,230,880
  Net loans..........   1,338,975      1,363,047      1,363,543      1,407,612      1,487,691      1,526,019      1,481,204
  Deposits...........   2,085,828      2,112,274      2,109,514      2,141,800      2,144,991      2,061,216      2,026,137
  Other borrowed
   funds.............     140,143         77,411         76,297         19,056         16,973         39,638         25,858
  Shareholders'
   equity............     200,212        180,969        188,644        177,639        162,583        150,342        134,527

Financial ratios:
  Total capital to
   risk-adjusted
   assets............       14.88%         12.32%         14.13%         12.30%         11.18%         10.78%          9.54%
  Tier 1 capital to
   average total 
   assets............        8.22           7.66           7.83           7.67           7.05           6.64           6.41
  Reserve for loan
   losses to total 
   loans.............        2.36           2.13           2.15           2.03           1.85           1.46           1.26
  Return on average
   assets............        1.12           0.32           0.51           0.68           0.64           0.83           0.70
  Return on average
   equity............       14.23           4.27           6.72           9.49           9.35          13.26          12.05
  Nonperforming
   assets to total 
   assets............        1.03           1.58           1.29           2.38           2.52           1.86           1.38

Per share:(2)
  Net income (loss)..  $     2.05     $     0.57     $     1.20     $     1.62     $     1.51     $     1.95     $     1.53
  Book value.........  $    20.03     $    18.06     $    18.81     $    17.97     $    16.88     $    15.81     $    14.24
  Average shares
   outstanding.......      10,034          9,997         10,048          9,877          9,776          9,654          9,544

Equivalent pro forma
  CapitolBank per 
   share:(3)     
  Net income.........     $0.19            $0.05          $0.11          $0.15          $0.14          $0.18          $0.14
  Book value.........     $1.88            $1.69          $1.76          $1.69          $1.58          $1.48          $1.34 
</TABLE> 
(1)  The financial data for Westamerica, PV Financial and North Bay and for
     Westamerica, PV Financial, North Bay and CapitolBank (pro forma combined)
     reflects restatements for Westamerica's pending acquisitions of PV
     Financial and North Bay, which are expected to be completed in the first
     quarter of 1995 and the second half of 1995, respectively, on a pooling of
     interests basis.

                                      -15-
<PAGE>
 
(2)   The pro forma combined per share data for net income has been calculated
      using pro forma combined average shares outstanding. Westamerica, PV
      Financial and North Bay pro forma combined average shares outstanding has
      been calculated using the average number of shares of Westamerica Common
      Stock outstanding during the periods presented increased by the shares of
      Westamerica Common Stock expected to be issued to PV Financial and North
      Bay shareholders using exchange ratios of .5450 and .3600, respectively,
      of a share of Westamerica Common Stock for each of the average shares of
      PV Financial and North Bay common stock outstanding during each of the
      periods presented as if these shares were outstanding during each of the
      periods presented. Such Westamerica, PV Financial and North Bay pro forma
      per share data assumes no dissenting PV Financial or North Bay
      shareholders and no exercise of outstanding Westamerica, PV Financial or
      North Bay stock options or stock appreciation rights. The exchange ratios
      used in connection with the PV Financial Merger and North Bay Merger are
      subject to potential adjustments in certain circumstances as provided in
      the PV Financial and North Bay agreements.
      
      Westamerica, PV Financial, North Bay and CapitolBank pro forma combined
      average shares outstanding has been calculated using the average number of
      Westamerica, PV Financial and North Bay pro forma combined average shares
      outstanding during the periods presented increased by the shares of
      Westamerica Common Stock expected to be issued to CapitolBank shareholders
      using an Exchange Ratio of .0938 of a share of Westamerica Common Stock
      for each of the average shares of CapitolBank Common Stock outstanding
      during each of the periods presented as if these shares were outstanding
      during each of the periods presented. Such pro forma per share data
      assumes no dissenting CapitolBank shareholders and no exercise of
      outstanding CapitolBank stock options. The Exchange Ratio is subject to
      potential adjustments as provided in the Agreement.
 
      See "The Merger--Exchange Ratio; Conversion of Shares of CapitolBank
      Common Stock" and "--Possible Adjustments to Exchange Ratio or Termination
      of the Agreement." See also "Pro Forma Combined Financial Information."
 
(3)   The equivalent pro forma CapitolBank per share information has been
      calculated by multiplying the pro forma combined per share data by the
      Exchange Ratio.

                                      -16-
<PAGE>
 
                                  INTRODUCTION

           This Proxy Statement/Prospectus is being furnished to shareholders of
      CapitolBank Sacramento ("CapitolBank") in connection with the solicitation
      of Proxies by the CapitolBank Board of Directors for use at the special
      meeting of shareholders of CapitolBank to be held at 300 Capitol Mall,
      Sacramento, California, on February 23, 1995 at 5:00 p.m., local time, and
      at any adjournments or postponements thereof (the "Meeting").

           At the Meeting, the shareholders of record of CapitolBank common
      stock ("CapitolBank Common Stock" or "CapitolBank Shares"), as of the
      close of business on January 13, 1995 (the "Record Date") will consider
      and vote upon a proposal to approve and adopt the Agreement and Plan of
      Reorganization, dated as of November 17, 1994 (the "Agreement"), between
      Westamerica Bancorporation ("Westamerica") and CapitolBank, an Agreement
      of Merger (the "Merger Agreement") among Westamerica, CapitolBank and
      Westamerica Merger Subsidiary, a wholly-owned subsidiary of Westamerica
      ("Merger Sub") (collectively, the "Agreements"), the Merger and the
      transactions contemplated thereby.  Copies of the Agreements are attached
      as Annex A hereto and more fully described herein.  The Agreements
      provide, among other things, that Merger Sub will merge with and into
      CapitolBank (the "Merger") and, except as described herein, each share of
      CapitolBank Common Stock will be converted into .0938 (the "Exchange
      Ratio") of a fully paid and nonassessable share of Westamerica common
      stock, without par value ("Westamerica Common Stock" or "Westamerica
      Shares"), subject to certain potential downward adjustments as set forth
      in the Agreement. See "The Merger--Exchange Ratio; Conversion of Shares of
      CapitolBank Common Stock," "--Possible Adjustments to Exchange Ratio or
      Termination of the Agreement" and "--Treatment of Stock Options." Shortly
      after the Merger, it is anticipated that CapitolBank will merge with and
      into Westamerica Bank. The date on which this Proxy Statement/Prospectus
      is first being sent to shareholders of CapitolBank is on or about 
      January 20, 1995.

           This Proxy Statement/Prospectus also serves as a prospectus for
      Westamerica under the Securities Act of 1933, as amended (the "Securities
      Act"), for the Westamerica Common Stock and certain common stock purchase
      rights associated therewith to be issued in connection with consummation
      of the Merger.


                         INFORMATION ABOUT WESTAMERICA

           Westamerica is a bank holding company registered under the Bank
      Holding Company Act of 1956, as amended ("BHC Act"), and was incorporated
      in the State of California in 1972.  At September 30, 1994, Westamerica
      had total consolidated assets of approximately $2.05 billion, deposits of
      approximately $1.71 billion and shareholders' equity of approximately $163
      million.  Westamerica's banking subsidiaries, Westamerica Bank, Napa
      Valley Bank and Bank of Lake County, are California state-chartered banks,
      with 48 banking offices in eleven counties in Northern California.

           Westamerica was formed pursuant to a plan of reorganization among
      three previously unaffiliated banks: Bank of Marin, Bank of Sonoma County
      and First National Bank of Mendocino County (formerly First National Bank
      of Cloverdale). Subsequent to its incorporation, Westamerica acquired the
      Bank of Lake County (1974), Gold Country Bank (1979) and Vaca Valley Bank
      (1981). In 1983, Westamerica merged all of its banking subsidiaries into a
      single commercial bank known as "Westamerica Bank, N.A." In 1988,
      Westamerica created a new national bank called Bank of Lake County N.A.
      which it promptly sold to Napa Valley Bancorp, a bank holding company
      headquartered in Napa, California ("Napa Valley Bancorp"). In 1992,
      Westamerica acquired John Muir National Bank and merged it with and into
      Westamerica Bank. In 1993, Westamerica acquired by merger Napa Valley
      Bancorp and its wholly-owned banking subsidiaries Napa Valley Bank and
      Suisun Valley Bank, and Napa Valley Development, a California corporation
      which owned, developed and marketed real estate and provided real estate
      consulting services to Napa Valley Bancorp. Napa Valley Development's 
      activities have been discontinued. Suisun Valley Bank was subsequently
      merged with and into Westamerica Bank. In addition, as part of the Napa
      Valley Bancorp merger, Westamerica reacquired Bank of Lake County, N.A.
      and acquired a majority interest in Sonoma Valley Bank, which was
      subsequently sold. In 1993, Westamerica Bank, N.A. was converted to a
      California state-chartered bank and became a member of the Federal Reserve
      System. In 1994, Bank of Lake County, N.A. was converted to a California
      state-chartered bank.

            Westamerica's subsidiary, Community Banker Services Corporation
      ("CBSC"), provides centralized services to Westamerica's banking
      subsidiaries.  Through its subsidiary, Weststar Mortgage Corporation, CBSC

                                      -17-
<PAGE>
 
      conducts mortgage servicing activities.  Westamerica also owns all of the
      capital stock of Westcore, an inactive California corporation
      ("Westcore").  The Federal Reserve Bank of San Francisco (the "FRBSF") has
      recently approved Westamerica's application to commence an employee
      benefit consulting business through Westcore.  It is anticipated that
      Westcore will commence business during 1995.

           Westamerica, through its banking subsidiaries, provides checking and
      savings deposit services as well as commercial, real estate and personal
      loans.  In addition, most branches offer safe deposit facilities,
      automated teller units, collection services and other investment services.

           Westamerica's principal executive offices are located at 1108 Fifth
      Avenue, San Rafael, California 94901, and its telephone number is (415)
      257-8000.


      Pending Acquisitions

           Westamerica, PV Financial, a bank holding company headquartered in
      Modesto, California ("PV Financial"), and PV Financial's wholly-owned
      subsidiary, Pacific Valley National Bank, a national banking association
      ("Pacific Valley National Bank"), have entered into an Agreement and Plan
      of Reorganization (as amended) dated as of July 25, 1994, whereby the
      parties thereto agreed to merge PV Financial into Westamerica (the "PV
      Financial Merger"). The PV Financial Merger will be completed when PV
      Financial merges with and into Westamerica and the shares of PV Financial
      common stock, no par value, are converted into shares of Westamerica
      Common Stock. It is currently contemplated that shortly after the PV
      Financial Merger is completed, Pacific Valley National Bank will be merged
      with and into Westamerica Bank. At September 30, 1994, PV Financial had
      approximately $173 million in assets, $152 million in deposits and $19
      million of shareholders' equity. Pacific Valley National Bank operates
      five branches in the Central California cities of Modesto, Ceres, and
      Turlock. The merger will result in the issuance of approximately 1.2
      million new shares of Westamerica common stock. The PV Financial Merger
      was approved by 63% of the outstanding shares of PV Financial Common Stock
      on November 14, 1994. No approval of Westamerica's shareholders was
      required. On November 17, 1994, the Board of Governors of the Federal
      Reserve System (the "Federal Reserve Board") approved the PV Financial
      Merger. On December 8, 1994, the FRBSF approved the merger of Pacific
      Valley National Bank into Westamerica Bank. It is anticipated that the PV
      Financial Merger will be consummated in the first quarter of 1995.

           Pacific Valley National Bank, one of its directors and an employee
      thereof are defendants in a lawsuit, filed in the United States District
      Court, Eastern District of California, which claims that they and certain
      other defendants violated the Sherman Antitrust Act of 1890, as amended
      (the "Sherman Antitrust Act") and the federal RICO statute. Pacific Valley
      National Bank (and its director and employee) has denied all allegations
      by the plaintiffs and has advised Westamerica that it will vigorously
      defend against the claims. A motion by Pacific Valley National Bank to
      dismiss the Sherman Antitrust Act and RICO claims was denied by order
      dated April 14, 1993; however, by stipulation, the parties dismissed
      common law claims for fraud, intentional interference with a contractual
      relationship, unfair and deceptive trade practices and civil conspiracy in
      June of 1993. The plaintiffs are seeking compensatory damages, treble and
      punitive damages and attorneys' fees and costs. Pacific Valley National
      Bank has filed a motion for summary judgment which is scheduled to be
      heard by the court early in 1995. Under the merger agreement with PV
      Financial, the exchange ratio can be adjusted downward by up to .0275 of a
      share of Westamerica common stock for categories or events which satisfy
      certain criteria. The above-referenced lawsuit and legal fees and costs
      related thereto, would likely qualify as an event which could cause the
      exchange ratio to be so adjusted.

           On December 9, 1994, Westamerica announced the signing of a
      definitive agreement by and between Westamerica and North Bay Bancorp, a
      bank holding company headquartered in Novato, California ("North Bay"),
      whereby the parties thereto agreed to merge North Bay into Westamerica
      (the "North Bay Merger").  Upon completion of the North Bay Merger, the
      shares of North Bay common stock, no par value, will be converted into
      shares of Westamerica common stock.  At September 30, 1994, North Bay had
      approximately $108 million in assets, $92 million in deposits and $9.8
      million in shareholders' equity.  North Bay's wholly-owned subsidiary,
      Novato National Bank, operates 3 branches in Ignacio, Novato and Santa
      Rosa, California.  The North Bay Merger 

                                      -18-
<PAGE>
 
      will result in the issuance of approximately 386,000 new shares of
      Westamerica Common Stock. It is anticipated that the North Bay Merger will
      be consummated in the third quarter of 1995. Shortly after the North Bay
      Merger, it is anticipated that Novato National Bank will be merged with
      and into Westamerica Bank.

           For additional information relating to Westamerica and the combined
      company that would result from the Merger, see "The Merger--Management and
      Operations Following the Merger" and "Pro Forma Combined Financial
      Information."


                         INFORMATION ABOUT CAPITOLBANK

           CapitolBank was incorporated under the laws of the State of
      California on December 31, 1975, and was licensed by the California State
      Banking Department and commenced operations as a California state-
      chartered bank on April 22, 1976.  At September 30, 1994, CapitolBank had
      total assets of approximately $138 million, total deposits of
      approximately $126 million and shareholders' equity of approximately 
      $9 million.

           CapitolBank engages in commercial banking services, including the
      acceptance of checking and savings deposits and the making of commercial,
      real estate, home improvement, consumer and other installment and term
      loans.  Inventory and accounts receivable financing, fixture and equipment
      financing and short-term operating loans are also provided.  CapitolBank
      also offers a full service trust department, safe deposit, night
      depository, wire transfer and other customary bank services to its
      customers.  At September 30, 1994, CapitolBank's trust department had
      trust assets under management totaling approximately $179 million.

           At September 30, 1994, CapitolBank had 81 full-time-equivalent
      employees.

           CapitolBank's executive offices are located at 300 Capitol Mall,
      Sacramento, California 95814, and its telephone number is (916) 449-8300.


                                  THE MEETING

      Matters to be Considered at the Meeting

           At the Meeting, holders of record of CapitolBank Common Stock will
      consider and vote upon a proposal to approve and adopt the Agreements, the
      Merger and the transactions contemplated thereby.

           THE CAPITOLBANK BOARD OF DIRECTORS HAS UNANIMOUSLY APPROVED THE
      AGREEMENTS, THE MERGER AND THE TRANSACTIONS CONTEMPLATED THEREBY, AND
      RECOMMENDS THAT CAPITOLBANK SHAREHOLDERS VOTE "FOR" APPROVAL AND ADOPTION
      OF THE AGREEMENTS, THE MERGER AND THE TRANSACTIONS CONTEMPLATED THEREBY.

           Only holders of record of CapitolBank Common Stock at the close of
      business on the Record Date will be entitled to notice of, and to vote at,
      the Meeting. As of the Record Date, there were 4,080,302 shares of
      CapitolBank Common Stock outstanding. Each CapitolBank Share will entitle
      the holder thereof to one vote per share held.

           Under the California General Corporation Law (the "GCL"), the
      approval and adoption of the Agreements, the Merger and the transactions
      contemplated thereby requires the affirmative vote of the holders of a
      majority of the outstanding shares of CapitolBank Common Stock.  Holders
      of at least a majority of the outstanding shares of CapitolBank Common
      Stock must be represented, either in person or by proxy, at the Meeting
      for a quorum to be present.

           Each properly completed Proxy returned in time for voting at the
      Meeting, unless revoked by the CapitolBank shareholder, will be voted in
      accordance with the instructions indicated on the Proxy, or, if no
      instructions are provided, will be voted "FOR" approval and adoption of
      the Agreements and the transactions contemplated thereby.  No matters
      other than those referred to in this Proxy Statement/Prospectus will be
      brought 

                                      -19-
<PAGE>
 
      before the Meeting, except for matters incidental to the conduct of the
      Meeting. CapitolBank has agreed in the Agreement that neither CapitolBank
      nor any member of the CapitolBank Board of Directors will submit any other
      matters for approval at the Meeting, except with Westamerica's prior
      approval. The grant of a Proxy will also confer discretionary authority on
      the persons named in the Proxy to vote on matters incident to the conduct
      of the Meeting, including any adjournment or postponement thereof.

           A CapitolBank shareholder may revoke a Proxy at any time before it is
      exercised by filing with the Corporate Secretary of CapitolBank, 300
      Capitol Mall, Sacramento, California 95814, a written instrument revoking
      the Proxy, by submitting a duly executed Proxy bearing a later date or by
      attending the Meeting and voting in person.

           CapitolBank shares which abstain from voting and "broker nonvotes"
      (shares as to which brokerage firms have not received voting instructions
      from their clients and therefore do not have the authority to vote the
      shares at the Meeting) will be counted for purposes of determining a
      quorum.  Because the affirmative vote of at least a majority of the
      outstanding shares of CapitolBank Common Stock is required to approve the
      Merger, both abstentions and broker nonvotes will have the same legal
      effect as votes against the Merger.  See "Dissenters' Rights of
      Appraisal."

           CAPITOLBANK SHAREHOLDERS SHOULD NOT SEND STOCK CERTIFICATES WITH
      THEIR PROXIES.  A TRANSMITTAL FORM WITH INSTRUCTIONS WITH RESPECT TO THE
      SURRENDER OF CAPITOLBANK STOCK CERTIFICATES WILL BE MAILED TO EACH
      CAPITOLBANK SHAREHOLDER AS SOON AS PRACTICABLE AFTER THE EFFECTIVE DATE OF
      THE MERGER.

           On the Record Date, the directors of CapitolBank and their respective
      affiliates as a group beneficially owned an aggregate of 1,029,459 shares
      of the then outstanding shares of CapitolBank Common Stock, or
      approximately 25.23% of the shares of CapitolBank Common Stock then
      outstanding and entitled to vote at the Meeting.  Each CapitolBank
      director has entered into an agreement with Westamerica to vote all of the
      CapitolBank Common Stock as to which such director has sole or shared
      voting power for approval and adoption of the Agreements and the
      transactions contemplated thereby.  Accordingly, approval and adoption of
      the Agreements, the Merger and the transactions contemplated thereby at
      the Meeting is expected to require the affirmative vote of an additional
      1,010,693 shares of CapitolBank Common Stock, or approximately 24.78% of
      the shares of CapitolBank Common Stock outstanding on the Record Date,
      voted by the remaining shareholders of CapitolBank.


      Certain Agreements

           Pursuant to the Agreement, the members of CapitolBank's Board of
      Directors each have entered into agreements with Westamerica in which they
      have confirmed to Westamerica that they have voted in favor of the
      Agreements in their capacities as directors, agreed to use their
      reasonable efforts to cause the shareholders of CapitolBank to approve the
      transactions contemplated by the Agreements and agreed to vote all
      CapitolBank Shares as to which such director has sole or shared voting
      power in favor of the Merger.

           Westamerica has the right to terminate the Agreement and not complete
      the Merger if any of the directors of CapitolBank who signed such
      agreements fails to perform and comply in all material respects with all
      of the terms and conditions contained in such agreements.  See "The
      Merger--Amendment; Termination."


                             CERTAIN CONSIDERATIONS

           In deciding whether to approve the Merger, CapitolBank shareholders
      should carefully consider the following factors, in addition to the other
      matters set forth or incorporated by reference herein:

                                      -20-
<PAGE>
 
      Tyler v. Wickland

           Three directors of CapitolBank are defendants in a lawsuit pending in
      the Sacramento County Superior Court, by shareholders of CapitolBank
      claiming, among other things, that such directors breached their fiduciary
      duties by failing to approve an alleged cash offer to purchase CapitolBank
      in 1991 for approximately $3.50 a share. The three directors have denied
      all allegations of wrongdoing and have denied liability. Although
      CapitolBank is not a defendant in such litigation, pursuant to the
      CapitolBank Bylaws (as defined herein) and indemnification agreements
      between CapitolBank and the defendant directors entered into prior to the
      filing of the lawsuit, CapitolBank is obligated to indemnify such
      directors with respect to legal fees, expenses (including amounts paid in
      settlement) and judgments related to the claims made in the lawsuit,
      subject to certain limitations in the indemnification agreements and under
      applicable law, including but not limited to circumstances under which the
      directors are found to have acted in bad faith, engaged in intentional or
      reckless misconduct or derived an improper personal benefit. CapitolBank
      has made a claim under its directors' and officers' liability insurance
      policy for reimbursement for any payments made by it to the directors
      under its Bylaws and the relevant indemnification agreements arising out
      of the alleged acts that gave rise to the claims in the lawsuit. In
      connection with the insurer's reservation of its rights, the insurer has
      commenced an investigation into whether the application for CapitolBank's
      directors' and officers' liability policy was materially incomplete. The
      insurer has asserted that if the application was materially incomplete, it
      can rescind the policy. The insurer's investigation was not complete as of
      the date hereof. If the insurance policy does not cover the defendant
      directors or it is rescinded and if such directors' actions must
      nonetheless be indemnified by CapitolBank, payments made by CapitolBank on
      behalf of the directors may adversely affect CapitolBank's results of
      operations and financial condition and could constitute Significant
      Liabilities under the Agreement which would cause the Exchange Ratio to be
      adjusted downward. As of the date hereof, legal expenses incurred in
      connection with the Tyler v. Wickland litigation totaled approximately
      $220,000, which amount would constitute Significant Liabilities. These
      amounts could increase significantly prior to the Effective Date and
      result in the maximum adjustment for Significant Liabilities of .0077. In
      addition, one of the conditions to consummation of the Merger is a letter
      from legal counsel to CapitolBank to the effect that CapitolBank will be
      reimbursed for expenses and other costs arising out of the Tyler v.
      Wickland litigation under its directors' and officers' liability insurance
      policy. Based on circumstances existing as of the date hereof, legal
      counsel to CapitolBank would be unable to issue such a letter. In
      addition, if CapitolBank is not reimbursed by the insurance carrier
      pursuant to the directors' and officers' liability insurance policy for
      payments it makes to the directors pursuant to its Bylaws and the
      indemnification agreements, Westamerica may have the right to terminate
      the Agreements. See "The Merger--Possible Adjustments to Exchange Ratio or
      Termination of the Agreement," "--Representations and Warranties;
      Conditions to the Merger," and "--Amendment; Termination." See also
      "Certain Differences in Rights of Shareholders--Indemnification of
      Directors and Executive Officers."


      Shares Eligible for Future Sale; Dilution

           Shares of Westamerica common stock eligible for future sale could
      have a dilutive effect on the market for Westamerica common stock and
      could adversely affect the market price. The Articles of Incorporation of
      Westamerica authorize the issuance of 20,000,000 shares of common stock of
      which 8,074,857 shares were outstanding at September 30, 1994. Pursuant to
      its stock option plans, at September 30, 1994, Westamerica had outstanding
      restricted performance shares and options to purchase an aggregate of
      492,993 shares of Westamerica Common Stock. Such options have exercise
      prices of between $8.50 and $28.06 per share. As of September 30, 1994,
      167,209 shares of Westamerica Common Stock remained available for option
      grants under Westamerica's stock option plans. Sales of substantial
      amounts of Westamerica Common Stock in the public market following the
      Merger could adversely affect the market price of Westamerica Common
      Stock. There are no restrictions in the Agreement preventing Westamerica
      from issuing additional shares.

           Westamerica has previously announced its intention to pursue
      acquisitions of other financial institutions from time to time where such
      acquisitions are believed by Westamerica to enhance shareholder value or
      satisfy other strategic objectives of Westamerica, including its pending
      acquisition of PV Financial and its recently announced proposed
      acquisition of North Bay Bancorp. Westamerica is also engaged in active
      negotiations with several potential financial institution acquisition
      targets. Other acquisitions, if any, could be accomplished by the issuance
      of additional shares of Westamerica common stock (as is the case in
      Westamerica's proposed acquisitions of PV Financial, CapitolBank and North
      Bay Bancorp) or other securities convertible into or exercisable for such
      Westamerica common stock. See "Pro Forma Combined Financial Information"
      and "Description of Westamerica Capital Stock and Indebtedness."

                                      -21-
<PAGE>
 
           There can be no assurance given as to the market value of Westamerica
      Common Stock after the Merger which may be affected by future
      acquisitions, if any, and other factors, including but not limited to,
      general economic conditions and fluctuating interest rates.

      Interests of CapitolBank Officers and Directors in the Merger

           CapitolBank's Vice Chairman and Chief Executive Officer, Thayer T.
      Prentice, and President and Chief Operating Officer, William J. Martin,
      are parties to employment agreements with CapitolBank dated as of March
      30, 1994 and April 2, 1994, respectively. Under the terms of the
      employment agreements, in the event that Messrs. Prentice and Martin are
      terminated upon a reorganization of CapitolBank, CapitolBank will be
      obligated to pay Messrs. Prentice and Martin: (i) their respective
      salaries through the date of termination; (ii) any bonus which was earned
      but not paid on the date of such termination; (iii) an amount equal to all
      accrued but unused paid vacation through the date of such termination;
      (iv) their respective unreimbursed expenses; and (v) Mr. Prentice $150,000
      and Mr. Martin $125,000, the equivalent of one year's salary for each. As
      discussed below, the Merger is a reorganization as defined in the
      employment agreements and, therefore, CapitolBank will pay the foregoing
      to Messrs. Prentice and Martin.

           In addition, pursuant to their employment agreements, Messrs.
      Prentice and Martin were granted options to purchase 125,000 and 104,167
      shares, respectively, of CapitolBank Common Stock exercisable at $1.50 per
      share.  The options were granted under CapitolBank's 1992 Stock Option
      Plan (the "CapitolBank Stock Option Plan") and were evidenced by stock
      option agreements.  Under the terms of the CapitolBank Stock Option Plan,
      the Stock Option Committee of the CapitolBank Board of Directors (the
      "Committee") has the power to interpret the CapitolBank Stock Option Plan
      and agreements made thereunder and to accelerate the vesting schedule with
      the consent of the optionee. The Committee exercised its discretion under
      the CapitolBank Stock Option Plan to fully vest the options of Messrs.
      Martin and Prentice so that such options may be exercised in full, subject
      to the occurrence of the Merger on the Effective Date, using the share
      withholding method. When Messrs. Prentice and Martin exercise their
      options and the payment of taxes is made using the share withholding
      method, CapitolBank will hold the net remaining shares until the Effective
      Date, at which time the CapitolBank Shares will be exchanged for the
      appropriate number of Westamerica Shares based on the Exchange Ratio. The
      Westamerica Shares received by Messrs. Prentice and Martin may be resold
      subject to applicable securities laws but no earlier than thirty days
      after combined results of operations are released to the public.

           CapitolBank maintains a directors' and officers' liability insurance
      policy covering all its directors, including Messrs. Prentice and Martin,
      and certain executive officers and has entered into separate
      indemnification agreements with each director and certain executive
      officers. See "Certain Differences in Rights of Shareholders--
      Indemnification of Directors and Executive Officer." Pursuant to the
      Agreement, the CapitolBank directors and officers may also obtain
      insurance for claims made within one year after the Effective Date,
      arising from facts or events (other than Tyler V. Wickland) which occurred
      prior to such date. The ability of CapitolBank's directors and officers to
      obtain extended insurance coverage may be affected based upon whether
      CapitolBank's current policy is rescinded. See "--Tyler V. Wickland". Upon
      the merger of CapitolBank with and into Westamerica Bank, Westamerica Bank
      shall be deemed to assume the liabilities of CapitolBank under its
      director and officer indemnification agreements as well as other
      liabilities and obligations of CapitolBank.


      Real Estate Lending Activities; Nonperforming Assets

           Westamerica's and CapitolBank's loan portfolios are dependent on 
      real estate. At September 30, 1994, real estate served as the principal
      source of collateral with respect to approximately 71% of CapitolBank's
      loan portfolio, 58% of Westamerica's loan portfolio, as combined with PV
      Financial's loan portfolio, and 59% of pro forma combined Westamerica and
      CapitolBank's loan portfolio. A worsening of current economic conditions
      and rising interest rates could have an adverse effect on the demand for
      new loans, the ability of borrowers to repay outstanding loans and the
      value of real estate and other collateral securing loans as well as
      Westamerica's financial condition in general and the market value for its
      Common Stock. Acts of nature, including earthquakes, which may cause
      uninsured damage and other loss of value to real estate that secure these
      loans, may also negatively impact Westamerica's financial condition.

           CapitolBank's nonperforming assets were $2.3 million

                                      -22-
<PAGE>
 
      or 1.64% of total assets at September 30, 1994, as compared to $1.4
      million or 1.13% of total assets at December 31, 1993, $3.6 million or
      2.89% of total assets at December 31, 1992 and $3.5 million or 2.36% of
      total assets at December 31, 1991. Westamerica's nonperforming assets were
      $20.2 million or 0.98% of total assets at September 30, 1994, as compared
      to $27.3 million or 1.36% of total assets at December 31, 1993, $50.6
      million or 2.55% of total assets at December 31, 1992 and $52.9 million or
      2.69% of total assets at December 31, 1991. There are no assurances that
      nonperforming assets will not increase and adversely affect the financial
      condition of CapitolBank and/or Westamerica. The Agreement provides that a
      condition to Westamerica's obligation to consummate the Merger is that at
      the month end immediately preceding the Effective Date and two days prior
      to the Effective Date, the percentage determined by dividing Classified
      Loans (as defined in the Agreement) by the sum of equity capital
      (excluding adjustments required by Financial Accounting Standards Board
      Bulletin No. 115 ("FASB No. 115")) plus reserves for loan losses as of
      December 31, 1994 shall not be greater than 42%. There are no assurances
      that CapitolBank will be successful in satisfying this condition prior to
      the Effective Date. See "The Merger--Reasons for the Merger;
      Recommendation of the Board of Directors," "--Representations and
      Warranties; Conditions to the Merger," "Management's Discussion and
      Analysis of Financial Condition and Results of Operations of CapitolBank,"
      and "Incorporation of Certain Documents by Reference."


      Organizational Structure and Operations After the Merger

           Upon the consummation of the Merger, the separate corporate existence
      of Merger Sub will cease and Merger Sub will be merged with and into
      CapitolBank, and CapitolBank will be a subsidiary of Westamerica.  Subject
      to receipt of regulatory approvals, it is anticipated that shortly after
      the Effective Date, CapitolBank will be merged with and into Westamerica
      Bank.

           Westamerica anticipates that after the Effective Date, a significant
      percentage of CapitolBank's existing employees and customers will be
      retained. Messrs. Prentice and Martin will not continue as employees of
      Westamerica Bank following the merger of CapitolBank with and into
      Westamerica Bank. There are no assurances, however, that CapitolBank
      customers will not move their banking relationships to other financial
      institutions and that a greater than anticipated number of CapitolBank
      employees will not remain employed by Westamerica Bank after the Merger.
      In addition, while Westamerica expects to achieve operating cost savings
      through the consolidation of certain operations, the elimination of
      duplicative corporate and administrative expenses and the elimination of
      certain positions at CapitolBank, there can no assurance that Westamerica
      will be able to realize such cost savings. See "The Merger--Covenants of
      Westamerica and CapitolBank; Conduct of Business Prior to the Merger" and
      "--Management and Operations Following the Merger."


      Effect of Shareholder Rights Plan

           Westamerica has a Shareholder Rights Plan which is implemented
      pursuant to an Amended and Restated Rights Agreement (the "Amended and
      Restated Rights Agreement") that could discourage potential takeover
      attempts and which could eliminate the possibility that Westamerica
      shareholders might realize a premium of the kind which often results from
      actual or rumored takeover attempts.  The Amended and Restated Rights
      Agreement entitles the holders of each share of Westamerica Common Stock
      to the right (each, a "Right") to purchase from Westamerica one share of
      Westamerica Common Stock at a price of $65 per share, subject to
      adjustment in certain circumstances.  The Rights are attached to
      Westamerica Common Stock.  The Rights only become exercisable and trade
      separately from Westamerica Common Stock following the earlier of (i) a
      public announcement that a person or group of affiliated or associated
      persons has become the beneficial owner of Westamerica securities having
      15% or more of Westamerica's voting power (an "Acquiring Person") or (ii)
      10 days following the commencement of, or a public announcement of an
      intention to make, a tender or exchange offer which would result in any
      Acquiring Person having beneficial ownership of securities having 15% or
      more of such voting power.  See " Description of Westamerica Capital Stock
      and Indebtedness--Shareholder Rights Plan."

      Legislative and Regulatory Environment

           The banking and financial services businesses in which Westamerica
      and CapitolBank engage are highly regulated.  The laws and regulations
      affecting such businesses are under constant review by Congress and
      applicable regulatory agencies and may be changed dramatically in the
      future.  Such changes could affect the business of bank holding companies
      and banks.  For example, in September 1994, the President signed
      legislation amending the BHC Act, and the Federal Deposit Insurance Act 
      (the "FDI Act") to provide for interstate banking and branching. Such
      changes may affect the competitive environment in which Westamerica Bank
      and CapitolBank operate and may affect the amount of capital that banks
      and bank holding companies are required to maintain, the premiums paid for
      or the availability

                                      -23-
<PAGE>
 
      of deposit insurance or other matters directly affecting earnings. It is
      not certain what changes will occur or the effect that any such changes
      would have on the profitability of the combined company, its ability to
      achieve certain cost savings or compete effectively or its ability to take
      advantage of new opportunities after the Merger. See "The Merger--
      Management and Operations Following the Merger," "Supplemental Historical
      Information," "Management's Discussion and Analysis of Financial Condition
      and Results of Operations of CapitolBank--Results of Operations," and
      "Incorporation of Certain Documents by Reference."

           Westamerica and CapitolBank are both organized under the corporate
      law of California.  While similarities in rights exist for shareholders of
      Westamerica and CapitolBank, there are significant differences in the laws
      applicable to each company and in their respective charter documents.  The
      primary difference is that Westamerica is a bank holding company which
      principally operates within the framework of the BHC Act and is regulated
      by the Federal Reserve System, while CapitolBank is a commercial bank
      which operates within the framework of the California Financial Code and
      the FDI Act. CapitolBank's primary regulators are the Superintendent of
      Banks of the State of California (the "Superintendant") and the FDIC. See
      "Certain Differences in Rights of Shareholders."


                                   THE MERGER

      Background of the Merger

           The following is a brief summary of the events that led to the
      execution of the Agreement and the accompanying Stock Option Agreement
      between CapitolBank and Westamerica, dated as of November 17, 1994, which
      is attached to this Proxy Statement/Prospectus as Annex D (the "Stock
      Option Agreement").

           As reported to shareholders of CapitolBank at the last annual meeting
      of shareholders in May 1994, the CapitolBank Board of Directors has been
      considering various alternatives to increase the value of CapitolBank and
      provide a return to its shareholders.  CapitolBank has not paid a cash or
      stock dividend since 1981, and the stock of CapitolBank has been
      essentially illiquid with potential selling shareholders unable to sell
      their stock immediately.

           To assist in exploring possible alternatives for increasing the value
      of CapitolBank, the CapitolBank Board of Directors retained Hoefer &
      Arnett Incorporated ("Hoefer") in February 1994.  To execute the
      CapitolBank Board of Directors' plan to increase shareholder value, the
      CapitolBank Board of Directors hired new executive management, including
      Thayer T. Prentice, Chief Executive Officer, in March 1994.  The
      CapitolBank Board of Directors requested Mr. Prentice to explore possible
      merger candidates for CapitolBank.  At various times during the first half
      of 1994, Mr. Prentice met informally with numerous different local banks
      to discuss the feasibility of combining with CapitolBank.  The intent was
      to form a larger institution with a larger shareholder base and stronger
      competitive ability in order to create shareholder value and stock
      liquidity.  One of the institutions with which Mr. Prentice met delivered
      a letter dated July 11, 1994 expressing an interest in acquiring
      CapitolBank.

           After reviewing such letter, the CapitolBank Board of Directors
      requested that Hoefer investigate whether other financial institutions may
      have an interest in acquiring CapitolBank. Hoefer approached Westamerica
      regarding the possibility of acquiring CapitolBank. Westamerica expressed
      an interest in making a proposal to acquire CapitolBank and executed a
      confidentiality agreement dated July 26, 1994. On July 27, 1994, the other
      institution sent a proposed draft of a letter of intent to acquire
      CapitolBank. In response to the active interest of both institutions and
      its determination that a business combination with one of the prospective
      acquirors was in the best interest of CapitolBank and its shareholders,
      the CapitolBank Board of Directors met on August 4, 1994, appointed a
      committee to pursue negotiations (the "Negotiating Committee") and
      instructed Hoefer to continue negotiations with both institutions.

           In the weeks that followed the August 4, 1994 CapitolBank Board of
      Directors meeting, Hoefer continued to develop the terms of potential
      transactions with both Westamerica and the other institution.  During the
      week of August 15, 1994, Westamerica performed limited due diligence on
      CapitolBank.  On September 16, 1994, CapitolBank engaged Financial
      Institutions Analysts and Consultants, Inc. to perform due diligence on
      both possible 

                                      -24-
<PAGE>
 
      acquirors. During the third week of September, 1994, the Chairman and Vice
      Chairman of CapitolBank met with the Chairman of Westamerica to discuss
      terms of a potential agreement. At approximately the same time, Hoefer
      requested that the other institution perform on-site due diligence of
      CapitolBank.

           From August 4, to October 31, 1994, the Negotiating Committee met
      eight times and the CapitolBank Board of Directors met ten times to review
      the status of negotiations and to discuss the relative advantages of the
      proposals received. At its October 3, 1994 meeting, the CapitolBank Board
      of Directors decided to obtain a draft merger agreement from Westamerica,
      and on October 13, 1994, representatives of Westamerica and CapitolBank
      met to discuss and review a preliminary draft of a merger agreement. As a
      result of that meeting, a number of material issues remained unresolved,
      and the CapitolBank Board of Directors directed management and its
      advisors to solicit from both Westamerica and the other institution by
      November 4, 1994, final offers which addressed issues deemed important by
      the CapitolBank Board of Directors including price, break-up fees,
      conditions, termination provisions and treatment of the Tyler v. Wickland
      litigation.

           On November 4, 1994, CapitolBank received final offers from both
      institutions, and on November 7, 1994, the CapitolBank Board of Directors
      met to evaluate the offers in detail. Even though the other bidder offered
      cash and stock consideration with a potentially higher per share value
      than the consideration offered by Westamerica (based on the then current
      stock prices of such institutions), the CapitolBank Board of Directors
      concluded, based on advice from Hoefer, that the trading volume of such
      bidder's stock relative to that of Westamerica might not enhance the
      ability of the shareholders of CapitolBank to realize full value for their
      shares. The CapitolBank Board of Directors was also concerned that
      regulatory agreements applicable to such other bidder could significantly
      delay consummation of any transaction with it or make regulatory approval
      of such transaction impossible. To address such concern, the CapitolBank
      Board of Directors directed Hoefer to seek an agreement from the bidder to
      appropriately compensate CapitolBank for the risk it would assume that the
      transaction might be delayed or not close due to the regulatory
      agreements. While the bidder offered some compensation, it refused to
      agree to the compensation deemed appropriate by the CapitolBank Board of
      Directors to cover the risk. After attempting unsuccessfully to obtain
      further concessions to address other concerns, the CapitolBank Board of
      Directors decided to proceed to negotiate a definitive agreement with
      Westamerica.

           On November 10, 1994, CapitolBank engaged Smith & Crowley Inc.
      ("Smith & Crowley") to act as a second investment advisor and render a
      fairness opinion regarding the proposals to acquire it. On November 16,
      1994, the CapitolBank Board of Directors approved the Agreement and a
      Stock Option Agreement (see "--Stock Option Agreement") with Westamerica.
      On November 17, 1994, Hoefer rendered to the CapitolBank Board of
      Directors a fairness opinion to the effect that the Exchange Ratio in the
      proposed Westamerica offer was fair from financial point of view to the
      shareholders of CapitolBank. The Agreement and the Stock Option Agreement
      were executed on November 17, 1994.

           See "--Reasons for the Merger; Recommendation of the Board of
      Directors" and "--Opinions of CapitolBank's Financial Advisors."


      Reasons for the Merger; Recommendation of the Board of Directors

           The CapitolBank Board of Directors believes that the Merger is fair
      and in the best interests of the shareholders of CapitolBank.  In reaching
      its conclusion to approve the Merger, the CapitolBank Board of Directors
      considered numerous factors, including the following:

           (1)  the fact that CapitolBank management and Hoefer identified and
                contacted a number of banking organizations regarding a sale of
                CapitolBank; that of those contacted, only two expressed serious
                interest in proceeding within a reasonable time; that of the
                two, Westamerica had the best chance of receiving regulatory
                approval to consummate the transaction and offered the best
                opportunity for shareholders to realize the value of their
                CapitolBank Common Stock;

           (2)  the opinion of Hoefer and Smith & Crowley that the Exchange
                Ratio is fair from a financial point of view to the shareholders
                of CapitolBank; in this regard, the CapitolBank Board of
                Directors considered the premium represented by the
                consideration offered to shareholders in relation to the book
                value per share of CapitolBank Common Stock;

                                      -25-
<PAGE>
 
           (3)  the CapitolBank Board of Directors' review of the provisions of
                the Agreements and related documents with Hoefer and
                CapitolBank's legal advisors;

           (4)  the fact that the Merger will be tax-free for federal income tax
                purposes to the holders of CapitolBank Common Stock (other than
                in respect to cash paid in lieu of fractional shares and for
                dissenters' rights) whereas the other offer of part cash would
                have resulted in taxable income;

           (5)  the market liquidity and dividend history of Westamerica Common
                Stock; and

           (6)  the current financial condition and prospects of CapitolBank as
                an independent community bank.

      THE CAPITOLBANK BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS THAT THE
      AGREEMENTS, MERGER AND TRANSACTIONS CONTEMPLATED THEREBY BE ADOPTED AND
      APPROVED BY THE SHAREHOLDERS OF CAPITOLBANK.



      Opinions of CapitolBank's Financial Advisors

      Hoefer & Arnett

          The CapitolBank Board of Directors retained Hoefer to render financial
      advisory and investment banking services in connection with the Merger.
      Hoefer has rendered a written opinion (the "Fairness Opinion") to the
      CapitolBank Board of Directors to the effect that the Exchange Ratio in
      the Agreement, as it may be adjusted for Significant Liabilities (as
      defined herein), is fair to the holders of CapitolBank Common Stock from a
      financial point of view.  No limitations were imposed by the CapitolBank
      Board of Directors upon Hoefer with respect to the investigations made or
      procedures followed in rendering the Fairness Opinion.

          A copy of the Fairness Opinion, dated as of November 17, 1994 which
      sets forth certain assumptions made, matters considered and limits on the
      review undertaken by Hoefer, is attached hereto as Annex B. The
      shareholders of CapitolBank are urged to read the Fairness Opinion in its
      entirety. The following summary of the procedures and analysis performed
      and assumptions used by Hoefer is qualified in its entirety by reference
      to the text of such Fairness Opinion. Hoefer's Fairness Opinion is
      directed to the CapitolBank Board of Directors only and is directed only
      to the Exchange Ratio and does not constitute a recommendation to any
      shareholder of CapitolBank as to how such shareholder should vote at the
      Meeting.

          In arriving at its opinion, Hoefer reviewed and analyzed, among other
      things, the following:  (i) the Agreement; (ii) Annual Reports to
      Shareholders of CapitolBank and Westamerica and Annual Reports on Form 10-
      K of Westamerica for the three years ended December 31, 1993, December 31,
      1992 and December 31, 1991; (iii) Quarterly Reports on Form 10-Q of
      Westamerica and Federal Deposit Insurance Corporation ("FDIC") Call
      Reports for CapitolBank for the quarters ended March 31, 1994, June 30,
      1994 and September 30, 1994; (iv) certain other publicly available
      financial and other information concerning CapitolBank and Westamerica and
      the trading markets for the publicly traded securities of CapitolBank and
      Westamerica; (v) publicly available information concerning other banks and
      holding companies, the trading markets for their securities and the nature
      and terms of certain other merger transactions Hoefer believed relevant to
      its inquiry; and (vi) evaluations and analyses prepared and presented to
      the CapitolBank Board of Directors or a committee thereof in connection
      with the business combination with Westamerica.  Hoefer also held
      discussions with senior management of CapitolBank and of Westamerica
      concerning their past and current operations, financial condition and
      prospects, as well as the results of regulatory examinations.

          Hoefer reviewed with senior management of CapitolBank earnings
      projections for 1995 through 1998 prepared by CapitolBank for CapitolBank,
      assuming the Merger did not occur.  Hoefer reviewed with the senior
      management of Westamerica earnings projections for 1995 through 1998 for
      Westamerica as a stand-alone entity, assuming the Merger did not occur, as
      well as possible operating cost savings potentially attainable in each
      such year resulting from the Merger. Such projections were prepared by
      Hoefer based partially upon discussions with Westamerica senior
      management, and Hoefer's own assessment of the operating cost savings
      realizable in the

                                      -26-
<PAGE>
 
      Merger. Certain pro forma financial projections for the years 1995 through
      1998 for the combined entity were derived by Hoefer based upon the
      information discussed above, as well as Hoefer's assessment of general
      economic, market and financial conditions. In certain cases, such combined
      pro forma financial projections included the possible operating cost
      savings believed by Hoefer to be realizable in the Merger.

          In conducting its review and in arriving at its opinion, Hoefer relied
      upon and assumed the accuracy and completeness of the financial and other
      information provided to it or publicly available and did not attempt
      independently to verify the same. Hoefer relied upon the managements of
      CapitolBank and Westamerica as to the reasonableness of the financial and
      operating forecasts, projections and possible operating cost savings (and
      the assumptions and bases therefor) provided to it, and Hoefer assumed
      that such forecasts, projections and possible operating cost savings
      reflected the best currently available estimates and judgments of the
      applicable managements. Hoefer also assumed, without independent
      verification, that the aggregate allowances for loan losses for
      CapitolBank and Westamerica are adequate to cover such losses. Hoefer did
      not make or obtain any evaluations or appraisals of the properties of
      CapitolBank or Westamerica, nor did it examine any individual loan credit
      files. For purposes of its opinion, Hoefer assumed that the Merger will
      have the tax, accounting and legal effects (including, without limitation,
      that the Merger will be accounted for as a pooling of interest) described
      in the Agreement. Hoefer's opinion is limited to the fairness, from a
      financial point of view, to the holders of CapitolBank Common Stock of the
      Exchange Ratio, as it may be adjusted, in the Merger and does not address
      CapitolBank's underlying business decision to proceed with the Merger.

          As more fully discussed below, Hoefer considered such financial and
      other factors as Hoefer deemed appropriate under the circumstances,
      including among others the following:  (i) the historical and current
      financial position and results of operations of CapitolBank and
      Westamerica, including interest income, interest expense, net interest
      income, net interest margin, provision for loan losses, noninterest
      income, noninterest expense, earnings, dividends, internal capital
      generation, book value, intangible assets, return on assets, return on
      shareholders' equity, capitalization, the amount and type of nonperforming
      assets, loan losses and the allowance for loan losses, all as set forth in
      the financial statements for CapitolBank and for Westamerica; (ii) the
      assets and liabilities of CapitolBank and Westamerica, including the loan,
      investment and mortgage portfolios, deposits, other liabilities,
      historical and current liability sources and costs and liquidity; and
      (iii) the nature and terms of certain other merger transactions involving
      banks and bank holding companies.  Hoefer also took into account its
      assessment of general economic, market and financial conditions and its
      experience in other transactions, as well as its experience in securities
      valuation and its knowledge of the banking industry generally.  Hoefer's
      opinion is necessarily based upon conditions as they existed and could be
      evaluated on the date of the Fairness Opinion and the information made
      available to it through that date.

          In connection with rendering its Fairness Opinion to the CapitolBank
      Board of Directors, Hoefer performed certain financial analyses, which are
      summarized below. Hoefer believes that its analysis must be considered as
      a whole and that selecting portions of such analysis and the factors
      considered therein, without considering all factors and analysis, could
      create an incomplete view of the analysis and the processes underlying
      Hoefer's Fairness Opinion.  The preparation of a fairness opinion is a
      complex process involving subjective judgments and is not necessarily
      susceptible to partial analysis or summary description.  In its analyses,
      Hoefer made numerous assumptions with respect to industry performance,
      business and economic conditions, and other matters, many of which are
      beyond the control of CapitolBank and Westamerica.  Any estimates
      contained in Hoefer's analyses are not necessarily indicative of future
      results or values, which may be significantly more or less favorable than
      such estimates.  Estimates of values of companies do not purport to be
      appraisals or necessarily reflect the prices at which companies or their
      securities may actually be sold.  None of the financial analyses performed
      by Hoefer was assigned a greater significance by Hoefer than any other.

          Financial forecasts and projections of CapitolBank and Westamerica
      prepared by Hoefer were based on projections provided by the respective
      companies as well as Hoefer's own assessment of general economic, market
      and financial conditions.  All such information was reviewed with the
      respective managements of CapitolBank and Westamerica.  Neither
      CapitolBank nor Westamerica publicly discloses internal management
      financial forecasts and projections of the type provided to Hoefer in
      connection with its review of the proposed Merger.  Such forecasts and
      projections were not prepared with a view towards public disclosure.  The
      forecasts, projections, and possible operating cost savings prepared by
      Hoefer were based on numerous variables and assumptions which are

                                      -27-
<PAGE>
 
      inherently uncertain, including, without limitation, factors related to
      general economic and market conditions.  Accordingly, actual results could
      vary significantly from those set forth in such forecasts and projections.

          Set forth below is a brief summary of the analyses performed by Hoefer
      in preparation of the Fairness Opinion. Hoefer assumed for purposes of its
      opinion that the Merger will be accounted for as a pooling of interests
      transaction under generally accepted accounting principles. Unless
      otherwise noted in this summary, Hoefer used an Exchange Ratio of .0938
      times the level at which CapitolBank Common Stock would be exchanged if
      the Effective Time (as defined herein) were the same as the date of the
      Fairness Opinion. The Exchange Ratio and possible adjustments to the
      Exchange Ratio were developed pursuant to extensive negotiations between
      CapitolBank and Westamerica. Hoefer analyzed certain effects of the Merger
      assuming Exchange Ratios, among others, of .0938 and .0861, the latter
      representing the fully adjusted Exchange Ratio assuming the maximum
      adjustment for Significant Liabilities. The .0861 does not necessarily
      reflect the lowest possible Exchange Ratio under the terms of the
      Agreement, and there can be no assurance that the Exchange Ratio as
      finally determined in accordance with the Agreement will not be lower than
      .0861. The analysis also focused on core financial and operating
      projections and statistics which were not specifically adjusted for
      nonrecurring charges, unless otherwise stated.

          Pro Forma Merger and Contribution Analysis.  Hoefer compared the
      changes in the amount of earnings book value and dividends attributable to
      one share of CapitolBank Common Stock before the Merger with the amounts
      attributable to the shares of Westamerica Common Stock for which such
      shares of CapitolBank would be exchanged under the Agreement.  The
      following assumptions regarding earnings and dividends underlie the pro
      forma results.

          The analysis assumes, unless otherwise stated, Merger-related
      operating cost savings prepared by Hoefer based partially upon discussions
      with the senior management of Westamerica and Hoefer's own assessment of
      the cost savings realizable in the Merger, assuming the Merger is
      completed during the first half of 1995.  These possible operating cost
      savings represent approximately 20% of CapitolBank's projected noninterest
      expense in 1994 on a pre-tax basis.  The possible operating cost savings,
      expressed as a percentage of CapitolBank's projected noninterest expense,
      is within the range of operating cost savings, expressed as a percentage
      of the acquiree's projected noninterest expense announced in similar
      transactions reviewed by Hoefer.

          Hoefer performed pro forma merger analyses assuming the stated
      earnings projections for Westamerica and CapitolBank and the Merger-
      related projected operating cost savings by Westamerica. In addition,
      Hoefer analyzed certain pro forma merger scenarios in order to assess the
      impact on CapitolBank of different levels of projected earnings as well as
      various degrees of Merger-related projected operating cost savings.

          The impact on CapitolBank of volatility in Westamerica's earnings and
      the level of Merger-related operating cost savings was shown by
      calculating pro forma results assuming Westamerica's earnings as
      projected, as well as 75% and 125% of Westamerica's projected earnings.
      In order to measure the impact on CapitolBank of volatility of
      CapitolBank's earnings to the pro forma results, Hoefer also examined the
      earnings impact on CapitolBank resulting at those levels of Westamerica
      earnings if CapitolBank achieved 75% and 125% of its projected earnings.
      The .0938 Exchange Ratio was used to make the calculations in each case,
      unless otherwise stated.

          In order to assess the impact on CapitolBank shareholders of
      variability of the possible operating cost savings projected by Hoefer to
      be realizable in the Merger, Hoefer compared the earnings, book value and
      dividends attributable to one share of CapitolBank Common Stock before the
      Merger with the earnings, book value and dividends attributable to the
      shares of Westamerica Common Stock for which such shares of CapitolBank
      would be exchanged, assuming 75% and 50% of the possible operating cost
      savings are realized.  In general, failure to fully realize the projected
      operating cost savings in the Merger does not significantly affect the
      conclusions of the analysis, although the changes in earnings, book value
      and indicated dividends attributable to one share of CapitolBank Common
      Stock as a result of the Merger are less favorable than those shown for
      the analysis assuming full realization of the possible operating cost
      savings.

                                      -28-
<PAGE>
 
     Hoefer concluded that changes in earnings per share, dividends and book 
value attributable to one share of CapitolBank Common Stock as a result of the
Merger are favorable compared to those of CapitolBank as a stand-alone entity.

     The following table presents the results of an analysis of differences in 
earnings, book value and dividends attributable to one share of CapitolBank
Common Stock before the Merger and attributable to the portion of a share of
Westamerica Common Stock for which such shares of CapitolBank would be exchanged
using Exchange Ratios of .0938 and .0861, under the above described
methodologies:



            Projected Changes in Book Value and Earnings Per Share
                            (Exchange Ratio .0938)
<TABLE>
<CAPTION>
 
                                   Comparative changes in projected earnings
Percentage of Projected               (stand-alone compared to pro forma)
Earnings Achieved By:              ----------------------------------------
CapitolBank/Westamerica             1995        1996        1997      1998
- -----------------------            ------      ------      ------    ------
<S>                                <C>         <C>         <C>       <C>
100% / 100%
Change in book value                (6.24)%     (1.34)%      3.03%     6.72%
Change in earnings per share       172.24      149.56      126.87    110.06
Change in dividend                  $0.07       $0.08       $0.09     $0.09
 
75% / 125%
Change in book value                 1.66%      11.63%      21.89%    32.34%
Change in earnings per share       379.78      372.09      358.25    348.29
Change in dividend                  $0.07       $0.08       $0.09     $0.10
 
125% / 75%
Change in book value               (13.78)%     (13.30)%   (13.75)%  (15.17)%
Change in earnings per share        60.30        33.81      15.97      3.48
Change in dividend                  $0.07        $0.08      $0.08     $0.09
 
</TABLE>
            Projected Changes in Book Value and Earnings Per Share
                            (Exchange Ratio .0861)
<TABLE>
<CAPTION>
                                       Comparative changes in projected earnings and book values
Percentage of Projected                         (stand-alone compared to pro forma)             
Earnings Achieved By:                  ---------------------------------------------------------
CapitolBank/Westamerica                  1995            1996             1997             1998
- -----------------------                -------         -------          -------          -------
<S>                                    <C>             <C>              <C>              <C>    
100% / 100%                           
Change in book value                   (13.64)%          (9.12)%          (5.10)%         (1.70)%
Change in earnings per share           154.09           126.87           114.26           94.31
Change in dividend                      $0.07            $0.07            $0.08           $0.09
 
75% / 125%
Change in book value                    (6.37)%           2.82%           12.27%          21.90%
Change in earnings per share           341.90           328.18           320.06          306.78
Change in dividend                      $0.07            $0.07            $0.08           $0.09
 
125% / 75%
Change in book value                   (20.58)%         (20.15)%         (20.56)%        (21.86)%
Change in earnings per share            46.36            22.66             7.05           (7.22)
Change in dividend                      $0.07            $0.07            $0.08           $0.08
</TABLE>

                                      -29-
<PAGE>
 
    Analysis of Other Merger Transactions.  Hoefer analyzed other bank and bank 
holding company merger and acquisition transactions in California completed
during the period from January 1, 1988 to November 30, 1994 where the total
consideration paid had a value between $5 million and $100 million. Hoefer
compared price to earnings, price to book value and price to tangible book value
multiples of the assumed Exchange Ratio to the high, median and low multiples of
all transactions. California-specific transactions were reviewed due to the
difference in the economic climate between California and the rest of the
country; as a comparison with non-California transactions could be misleading.
Hoefer assumed a Westamerica stock price of $30.50, the closing market price at
November 17, 1994, and CapitolBank's annualized earnings and book value for or
at the period ended September 30, 1994.

     Set forth below is certain information relating to the Exchange Ratio
described above, and the high, median and low transaction multiples summarized 
above:

<TABLE>
<CAPTION>
                                                                            Proposed Westamerica/
                                    California Transactions greater          CapitolBank Merger
                                     than $5 million and less than               Conversion            Exchange
                              $100 million from 1988 to November 30, 1994       Ratio .0938x*         Ratio .0861x
                            -----------------------------------------------   ----------------      ----------------
<S>                             <C>              <C>           <C>                <C>                    <C> 
                                  High           Median          Low
                                 ------          ------        -------
Price to earnings                48.35x          16.13x        (2.94)x             32.00x                 23.82x
 
Price to book value               2.98            1.66          0.61                1.30                   1.15
 
Price less tangible book
  value to total deposits        14.82%           6.63%        (5.38)%              2.20%                  1.13%
 
</TABLE>
- ---------------------------------------

*    Not adjusted for potential Significant Liabilities as set forth in the 
     Agreement.

     The bank merger and acquisition transactions for the period from
January 1, 1988 to November 17, 1994 included in the above multiples are set 
forth below.  Except as otherwise noted, the acquiror and the acquiree are both 
located in the State of California.

         Acquiror                                  Acquiree          
- -----------------------------            -----------------------------

Westamerica Bancorp                      PV Financial                      
Comerica Inc. (Michigan)                 University National               
First Interstate Bancorp                 Levy Bancorp                      
Business & Prof. Bancorp                 Sacramento First National         
ValliCorp Holdings                       Bank One Fresno                   
Natl. Bank of the Redwoods               Codding Bank                      
ValliCorp Holdings                       Mineral King Bancorp              
SJNB Financial Corp.                     Business Bancorp                  
Mid Peninsula Bancorp                    San Mateo County Bancorp          
California Bancshares                    Bank of Livermore                 
California State Bank                    Bank of Anaheim                   
CVB Financial                            Western Industrial National Bank  
Trico Bancshares                         Country National Bank             
California Bancshares                    MBC Corp.                         
First Interstate Bancorp                 First State Bank of the Oaks      
First Interstate Bancorp                 Cal Rep Bancorp                   
Westamerica Bancorp                      Napa Valley Bancorp               
CVB Financial                            Fontana First National Bank       
ValliCorp Holdings                       Pacific Bancorporation            
Westamerica Bancorp                      John Muir National Bank           

                                      -30-
<PAGE>
 
         Acquiror                                  Acquiree          
- -----------------------------            -----------------------------

El Dorado Bancorp                        San Clemente Bancorp              
Wells Fargo & Co                         Citizens Holdings                 
Bank of Fresno                           Madera Valley Bank                
Home Interstate Bancorp                  Torrance National Bank            
Citicorp                                 DeAnza Bank                       
California State Bank                    Empire Bancorp                    
Comerica Inc. (Michigan)                 InBancshares                      
Security Pacific                         Santa Clarita National Bank       
City National                            Warner Center Bank                
Pacific Capital Bancorp                  Pajaro Valley Bancorp             
Security Pacific                         La Jolla Bancorp                  
Bank of the West                         Central Banking System            
Wells Fargo                              Torrey Pines Group. Inc.           
Wells Fargo                              Valley National Bank
Alameda Bancorp                          Westside Bank       
Commerce Bancorp                         California City Bank
Security Pacific                         Southwest Bank      
Commercial Bank of Pasadena              Bank of Redlands    
First Interstate                         Alex Brown Financial 

     Discounted Cash Flow Analysis.  Hoefer examined the results of a
discounted cash flow analysis designed to compare the present value, under
certain assumptions, of cash flows that would be attained if CapitolBank
remained independent through 1998, with the present value of the earnings
projected to be achieved by the combined entities during the same period. The
results produced in the analysis did not purport to be indicative of actual
values or expected values of CapitolBank or the shares of CapitolBank Common
Stock.

     In calculating the present values through the discounted cash flow 
analysis, Hoefer analyzed the effect of possible earnings variability and
possible Merger-related operating cost savings variability, among other items,
by assuming varying levels of projected earnings for CapitolBank and
Westamerica. The three cases examined were: CapitolBank earnings as projected
and Westamerica earnings as projected; CapitolBank earnings at 75% of projected
earnings and Westamerica earnings at 125% of projected earnings; and CapitolBank
earnings at 125% of projected earnings and Westamerica earnings at 75% of
projected earnings. Pro forma combined cash flows were calculated assuming the
combinations of the cash flows in each of these cases, and were compared to the
cash flows of CapitolBank on a stand-alone basis as well as to the cash flows of
CapitolBank acquired in 1998 by a larger financial institution. All cases were
analyzed assuming realization of the operating cost savings, prepared by Hoefer,
in the amounts and time periods previously indicated, unless otherwise stated.
See Pro Forma Merger and Contribution Analysis.

     The discount rates used ranged from 10.0% to 18.0%.  For the CapitolBank 
stand-alone analyses, the terminal price multiples applied to 1998 estimated
book value ranged from 1.00x to 2.00x. The lower levels of the price/book value
multiples range reflected an estimated future trading range of CapitolBank,
while the higher levels of the price/book value multiples range were more
indicative of a future sale of CapitolBank's stock to a larger financial
institution. For the pro forma combined analyses, the terminal price/book
multiples also ranged from 1.00x to 2.00x.

     For the CapitolBank stand-alone analyses, the cash flows were comprised of 
the projected stand-alone dividends per share in years 1994 through 1998 plus
the terminal value of CapitolBank's Common Stock at year-end 1998 (calculated by
applying each one of the assumed terminal price/book value multiples as stated
above to 1998 projected CapitolBank book value per share). For the pro forma
combined analyses, the cash flows were comprised of the projected pro forma
combined dividends per share in years 1994 through 1998 plus the terminal value
of the pro forma combined entity's stock at year-end 1998 (calculated by
applying each one of the assumed terminal price/book value multiples as stated
above to 1998 projected pro forma combined book value per share). 

                                      -31-
<PAGE>
 
The discount rates described above were then applied to these cash flows to 
obtain the present values per share of CapitolBank Common Stock.

     The following table presents the results of the discounted cash flow
analysis described above using a discount rate of 14%, the mid-point of the 
range of discount rates employed in the analysis:


               Projected Present Value of Discounted Cash Flows
                            (Exchange Ratio .0938)
<TABLE>
<CAPTION>
 
Percentage of Projected         Percentage of Possible Cost Savings Realized 
Earnings Achieved by          ------------------------------------------------
CapitolBank/Westamerica        1.50x Book Value              2.00x Book Value 
- -----------------------       ------------------            ------------------
<S>                           <C>                           <C>
 
100%/100%
   CapitolBank stand-alone          $2.32                         $3.09
   Pro forma combined                2.71                          3.54
   Percentage change
      in CapitolBank                16.81%                        14.56%
 
75%/125%
   CapitolBank stand-alone          $2.15                         $2.87
   Pro forma combined                3.09                          4.04
   Percentage change
      in CapitolBank                43.72%                        40.77%
 
125%/75%
   CapitolBank stand-alone          $2.52                         $3.36
   Pro forma combined                2.37                          3.08
   Percentage change
      in CapitolBank                (5.95)%                       (8.33)%

</TABLE>

                Projected Present Value of Discounted Cash Flows
                             (Exchange Ratio .0861)
<TABLE>
<CAPTION>
 


                                                                      
Percentage of Projected         Percentage of Possible Cost Savings Realized
Earnings Achieved by         ---------------------------------------------------
CapitolBank/Westamerica       1.50x Book Value                 2.00x Book Value
- -----------------------      ------------------               ------------------
<S>                          <C>                              <C>
100%/100%
   CapitolBank stand-alone          $2.32                           $3.09
   Pro forma combined                2.50                            3.26
   Percentage change
      in CapitolBank                 7.76%                           5.50%
 
75%/125%
   CapitolBank stand-alone          $2.15                           $2.87
   Pro forma combined                2.85                            3.72
   Percentage change
      in CapitolBank                32.56%                          29.62%
 
125%/75%
   CapitolBank stand-alone          $2.52                           $3.36
   Pro forma combined                2.18                            2.84
   Percentage change
      in CapitolBank               (13.49)%                        (15.48)%


</TABLE>

                                      -32-
<PAGE>
 
     The analysis showed that use of a higher (lower) level of projected
Westamerica earnings raised (lowered) the resulting present value for a given
level of CapitolBank earnings, on a pro forma combined basis. The analysis also
showed that use of a lower (higher) discount rate or a higher (lower) terminal
price/book value multiple raised (lowered) the calculated present values. In all
cases, for a given discount rate and a given price/book value multiple, the
analysis showed that the financial terms of the Merger offered a higher present
value per share of CapitolBank Common Stock than if CapitolBank remained
independent through 1998 or was acquired in 1998 by a larger financial
institution. However, the examples shown above do not necessarily indicate that
a direct comparison of the present values obtained using the same terminal
price/book value multiple and/or discount rate for the CapitolBank stand-alone,
CapitolBank acquired in 1998 by a larger financial institution, and pro forma
combined entity cash flows, are the only comparisons which can be made.

     Comparable Company Analysis.  Hoefer examined recent historical data on 
CapitolBank and Westamerica based upon information from the companies' 1993
Annual Reports to Shareholders and subsequent quarterly information. Hoefer
analyzed certain credit and operating statistics for CapitolBank and
Westamerica, comparing these statistics to data for a peer group of California
banks using the publicly published Hoefer California Independent Bank Index (the
"Index"), comprised of 48 institutions. Both Westamerica and CapitolBank are
participants in the Index. The comparisons made are as of or for the period
ending September 30, 1994, unless otherwise noted. The following table presents
the results of the comparable company analysis described above:

                          Comparable Company Analysis
                          (as of September 30, 1994)
<TABLE>
<CAPTION>
 
                                           Westamerica    CapitolBank   Index Median
                                           -----------    -----------   ------------
<S>                                         <C>             <C>            <C>
 
Total assets...........................     $2,052,084      $138,060       $230,517
Market capitalization..................        244,264       $10,201        $18,311
Price to tangible equity per share.....           1.50x         1.09x          0.95x
Tangible Equity to tangible assets.....           7.94%         6.78%          8.31%
Risk based capital ratio...............          15.17         11.04          13.55
Nonperforming assets to total assets...           0.98          1.64           1.69
Loan loss reserve to nonperforming
  assets...............................         136.75         79.89          69.79
Return on assets.......................           1.23          0.66           0.99
Return on equity.......................          15.65          9.53          11.45
Net interest margin....................           4.95          6.63           6.11
Noninterest expense to average earning
  assets...............................           3.43          5.92           4.73

</TABLE>

     Hoefer concluded based on the comparable company analysis that the
attributes of ownership of shares of Westamerica Common Stock as a result of the
Merger are more favorable than the attributes of ownership of shares CapitolBank
as a stand-alone entity.

     Hoefer is an investment banking firm continually engaged in the valuation 
of businesses and securities, including financial institutions and their
securities, in connection with mergers and acquisitions, negotiated
underwritings, private offerings of securities, secondary distributions of
listed and unlisted securities and valuations for estate, corporate and other
purposes.

      As a normal part of its business, Hoefer analyzes securities of financial
institutions for the purposes of providing, among other things, transactional
advice and assistance, investment research and capital financing activities.
Hoefer currently conducts dealer markets in the shares of more than 120
independent financial institutions, including Westamerica and CapitolBank. In
addition, the principals of Hoefer have substantial experience in investment and
commercial banking, some of which may be deemed applicable to the Fairness
Opinion. Hoefer has not previously provided services to either Westamerica or
CapitolBank, however, Hoefer and certain of its principals own approximately
0.1% of Westamerica's Common Stock.

                                      -33-
<PAGE>
 
     Financial Advisory Fees.  CapitolBank has agreed to pay Hoefer for merger 
advisory and other services, including its Fairness Opinion, as follows:

     (a)    $50,000 payable upon the signing of the Agreement;

     (b)    An additional fee equal to 1.50% of the aggregate consideration 
     paid; such additional fee to be reduced by the amount payable under the 
     immediately preceding clause (a).

     CapitolBank has also agreed to reimburse Hoefer for all out-of-pocket
expenses which may be incurred by it in connection with the rendering of the
Fairness Opinion, not to exceed $25,500 without the consent of CapitolBank, and
to indemnify Hoefer against certain liabilities. No portion of the fee is
contingent upon the conclusions reached in the Fairness Opinion.

Smith & Crowley

     Pursuant to an engagement letter dated November 10, 1994, CapitolBank
engaged Smith & Crowley to act as a financial advisor in connection with its
evaluation of strategic alternatives, including the possible merger of
CapitolBank with Westamerica or another potential purchaser. Smith & Crowley is
an investment banking firm specializing in commercial banks, savings and loan
associations, savings banks, and other financial intermediaries, and, as part of
its investment banking activities, is called upon to advise clients in mergers,
acquisitions, valuations and business activities involving financial
institutions. CapitolBank selected Smith & Crowley as its financial advisor on
the basis of this experience and the expertise of Smith & Crowley and its
principals in transactions similar to this Merger.

     Immediately prior to the November 17, 1994 meeting of the CapitolBank
Board of Directors, the management of CapitolBank presented the Exchange Ratio
to Smith & Crowley, upon which Smith & Crowley delivered its verbal opinion,
subsequently confirmed in writing as of the date hereof, that the Exchange
Ratio, including any adjustments thereto pursuant to the Agreements, is fair to
CapitolBank and its shareholders from a financial point of view. No limitations
were imposed by CapitolBank on Smith & Crowley with respect to the
investigations made or procedures followed in rendering its opinion. The full
text of Smith & Crowley's written opinion to the CapitolBank's Board of
Directors, which sets forth the assumptions made, matters considered, and
limitations of the review by Smith & Crowley, is attached hereto as Annex C and
is incorporated herein by reference and should be read carefully and in its
entirety in connection with this Proxy Statement/Prospectus. Smith & Crowley's
opinion is addressed to the CapitolBank Board of Directors only and does not
constitute a recommendation to any shareholder of CapitolBank as to how such
shareholder should vote at the Meeting.

     In connection with its opinion, Smith & Crowley, among other things:
(i) reviewed certain publicly available financial and other data with respect to
CapitolBank and Westamerica, including the annual audited consolidated financial
statements for 1989 through 1993, unaudited interim periods to September 30,
1994, and certain other relevant financial and operating data relating to
CapitolBank and Westamerica made available to Smith & Crowley from published
sources and from the internal records of CapitolBank and Westamerica; (ii)
reviewed the form of the Agreement and made inquiries regarding and discussed
the Merger, the Agreement and other matters related thereto with CapitolBank's
management and counsel; in addition, Smith & Crowley analyzed the Exchange Ratio
of .0938 and the effect of adjustments in the Exchange Ratio potentially
attributable to Significant Liabilities as defined in the Agreement, including
the effect of the maximum Significant Liabilities adjustment, which would reduce
the Exchange Ratio to .0861; (iii) compared CapitolBank and Westamerica from a
financial point of view with certain other companies and groups of companies in
the banking industry that Smith & Crowley deemed to be relevant; (iv) considered
the financial terms, to the extent publicly available, of selected recent
business combinations of companies in the banking industry, which Smith &
Crowley deemed to be comparable, in whole or in part, to the Merger; (v)
reviewed and discussed with representatives of the management of CapitolBank
certain information of a business and financial nature regarding CapitolBank,
furnished to Smith & Crowley by CapitolBank, including legal matters, lease
agreements, credit quality data, financial forecasts and related assumptions of
CapitolBank; (vi) reviewed and discussed with representatives of the management
of Westamerica certain information of a business and financial nature regarding
Westamerica, furnished to Smith & Crowley by Westamerica concerning the holding
company and its principal subsidiaries, 

                                      -34-
<PAGE>
 
including current financial condition, credit quality data, other pending 
transactions, and general business plans; (vii) reviewed the price history,
trading volume and valuation of Westamerica Common Stock and, subject to more
limited availability of information, that of CapitolBank as well; (viii) met
with various officers and other members of management of CapitolBank and
Westamerica to discuss the foregoing, as well as other matters Smith & Crowley
viewed as relevant to its analysis, and (ix) considered such other information,
financial data and analyses, and economic and market criteria and performed such
other analyses and examinations as Smith & Crowley deemed appropriate.

     In connection with its review, Smith & Crowley did not assume any 
responsibility for independent verification of any of the foregoing information,
and relied on all such information and assumed all such information was complete
and accurate in all material respects. With respect to financial forecasts for
CapitolBank provided to Smith & Crowley by CapitolBank's management, Smith &
Crowley assumed for purposes of its opinion that such forecasts were reasonably
prepared on bases reflecting the best available estimates and judgments of
CapitolBank's management at the time of preparation as to the future financial
performance of CapitolBank and provided a reasonable basis upon which Smith &
Crowley could form its opinion. Smith & Crowley also assumed that there were no
material changes in CapitolBank's assets, financial condition, results of
operations, business or prospects since the respective dates of the last
financial statements made available to Smith & Crowley. Smith & Crowley is not
expert in the evaluation of loan portfolios for purposes of assessing the
adequacy of the allowance for losses with respect thereto and assumed for
purposes of its opinion that such allowances for CapitolBank are in the
aggregate adequate to cover such losses. In addition, Smith & Crowley did not
review any individual credit files, did not make an independent evaluation,
appraisal or physical inspection of the assets or individual properties of
CapitolBank, and was not furnished with any such appraisals. Further, Smith &
Crowley's opinion was based on economic, monetary, market and other conditions
as in effect on, and the information made available to Smith & Crowley as of,
the date of the opinion, and on the assumption that the Merger will be
consummated in accordance with its terms, without any amendment thereto and
without waiver by Westamerica or CapitolBank of any of the conditions to their
obligations thereunder.

     Set forth below is a brief summary of the analysis made by Smith & Crowley 
in conjunction with its opinion, which has been delivered in written form as of
the date hereof and which is expected to be confirmed in writing as of the date
of the Meeting.

     Comparable Company Analysis.  Using public and other available 
information, including FDIC call report data, Smith & Crowley compared certain
financial ratios of CapitolBank (including the ratio of net income to average
total assets, "return on average assets" or "ROA," the ratio of net income to
average total equity, "return on average equity" or "ROE," certain capital
adequacy ratios, certain credit quality ratios, net interest margin, certain
cost control ratios and percentage dependence on certain large denomination
deposit sources) for 1992, 1993, the year-to-date ending June 30, 1994, to five
proxy groups:

     (a)  a representative sampling of the commercial banking industry 
          nationally;

     (b)  360 independent California banks;

     (c)  197 California banks with total assets of between $50 million
          and $200 million;

     (d)  89 Northern California banks with assets of $50 to $200 million;
          and

     (e)  10 Sacramento-based commercial banks.

Analysis of profitability (ROA and ROE) showed that CapitolBank trailed all
proxy group averages in all three time periods, except in 1993 when, because of
the weakness of the economy and bank profitability in Southern California,
CapitolBank's profitability (ROA of 0.26% and ROE of 3.57%) modestly exceeded
both the statewide average ROA and ROE of the 360 independent California banks
(ROA of 0.15% and ROE of 1.69%) and the similar statewide averages of 197
California banks with total assets of between $50 and $200 million (ROA of 0.07%
and ROE of 0.75%). However, its performance continued to lag the national proxy
group (ROA of 1.13% and ROE of 14.61%), the 89 Northern California bank group 
(ROA of 0.77% and ROE of 7.37%) and the 

                                      -35-
<PAGE>
 
Sacramento proxy group, in which it ranked 7th among 10 in both ROA and ROE.  
In terms of capital adequacy measures (Tier 1 Capital/Risk Assets, Total
Capital/Risk Assets, Leverage Ratio, and Average Equity/Average Capital),
CapitolBank's capital ratios were satisfactory, but slightly below the averages
for most proxy groups in most of the periods examined. Analysis of CapitolBank's
key credit quality ratios (the ratio of net loan loss charge-offs to average
loans, allowance for loan losses as a percentage of total loans, nonperforming
assets as a percent of total loans plus other real estate owned, and allowance
for loan losses as a percentage of loans on which interest is not being accrued)
showed CapitolBank to be comparable with the national proxy group and generally
better than the California proxy groups in most categories. An exception was
CapitolBank's below average comparison with the Sacramento proxy group in 1992.
CapitolBank's net interest margin was ahead of proxy group averages in 1993 and
year-to-date 1994, but lagged the other averages in 1992. Expense ratio
comparisons for all periods and against all proxy groups showed CapitolBank to
have quite high comparative noninterest expense ratios in the periods examined.
No company used in the analysis is identical to CapitolBank, and there are
differences between CapitolBank and the proxy groups. The analyses necessarily
involved complex considerations and judgments concerning differences in
financial and operating characteristics of the companies.

     Analysis of Selected Bank Merger Transactions.  Smith & Crowley  reviewed 
the consideration paid in recently announced transactions whereby certain banks
were acquired. While Smith & Crowley reviewed the median and average terms of
1,034 transactions involving acquisitions of banks in the United States
announced since year-end 1991 (the "National Bank Transactions") and of 86
transactions involving acquisitions of banks in the Western Region of the United
States ("Western Bank Acquisitions") announced since year-end 1991, Smith &
Crowley believes that factors unique to California, particularly the
comparatively weak economic, business and financial environment, have impacted
the value of bank merger transactions; therefore, Smith & Crowley placed
particular emphasis on 13 transactions involving acquisitions of California
banks, announced since year-end 1991 and subsequently completed or currently
pending, for which key financial terms are publicly disclosed (the "California
Bank Transactions"). For each bank acquired or to be acquired in such
transactions, Smith & Crowley compiled figures illustrating, among other things,
the ratio of the premium (i.e., purchase price in excess of book value) to core
deposits, purchase price to book value and purchase price to latest twelve-
months ("LTM") earnings.

     The figures for the National Bank Transactions, the Western Bank
Transactions and the California Bank Transactions produced: (i) a median
percentage of premium (purchase price in excess of book value) to core deposits
of 6.34%, 5.57% and 4.77%, respectively; (ii) an average purchase price to book
value of 164%, 163% and 130%, respectively; (iii) a median purchase price to LTM
earnings of 14.7x, 19.1x and 30.3x, respectively. In comparison, assuming as of
November 17, 1994, that the consideration to be paid in the Merger for each
share of CapitolBank Common Stock equals $2.91, Smith & Crowley determined that
the consideration to be received by the holders of the CapitolBank Common Stock
in the Merger represented a percentage premium to core deposits of 2.21%, a
purchase price to book value of 128% and a purchase price to LTM earnings of
27.5x.

     No other company or transaction used in the above analysis as a comparison 
is identical to CapitolBank or the Merger. Accordingly, any analysis of the
results of the foregoing is not mathematical; rather, it involves complex
considerations and judgments concerning differences in financial and operating
characteristics of the companies and other factors that could affect the public
trading value of the companies to which CapitolBank and the Merger are being
compared.

     The summary set forth above does not purport to be a complete description 
of the analyses performed by Smith & Crowley. The preparation of a fairness
opinion necessarily is not susceptible to partial analysis or summary
description. Smith & Crowley believes that its analyses and the summary set
forth above must be considered as a whole and that selecting a portion of these
analyses and factors would create an incomplete view of the process underlying
the analyses. In addition, Smith & Crowley may have given certain analyses more
or less weight than other analyses and may have deemed various assumptions more
or less probable than other assumptions, so that the ranges of valuations
resulting from any particular analysis described above should not be taken to be
Smith & Crowley's view of the actual value of CapitolBank or the combined
companies. The fact that any specific analysis has been referred to in the
summary above is not meant to indicate that such analysis was given greater
weight than any other analysis.

                                      -36-
<PAGE>
 
     In performing its analyses, Smith & Crowley made numerous assumptions with 
respect to industry performance, general business and economic conditions and
other matters, many of which are beyond the control of CapitolBank. The analyses
performed by Smith & Crowley are not necessarily indicative of actual values or
actual future results, which may be significantly more or less favorable than
suggested by such analyses. Such analyses were prepared solely as part of Smith
& Crowley's analysis of the consideration to be received by the CapitolBank
shareholders in the Merger. The analyses do not purport to be appraisals or to
reflect the prices at which shareholders of company might be sold or the prices
at which any securities may trade at the present time or any time in the future.

     As described above, Smith & Crowley's verbal fairness opinion received by 
the CapitolBank Board of Directors was among the many factors taken into
consideration by the CapitolBank Board of Directors in making its determination
to approve the Merger.

     CapitolBank has agreed to pay Smith & Crowley $17,500 for rendering its 
opinion as to the fairness of the Merger from a financial point of view to the
shareholders of CapitolBank. CapitolBank has also agreed to reimburse Smith &
Crowley for its reasonable out-of-pocket expenses and has agreed to indemnify
Smith & Crowley, its directors, officers, agents, employees and owners against
certain liabilities.

     Smith & Crowley has had no prior business relationships with either party 
to this transaction; however, certain principals of Smith & Crowley, in former
positions as senior officers of investment banking and commercial banking
companies, did, in the course of their activities in past years, have direct
contact with Westamerica, its management, and banks that were owned or were
subsequently acquired by Westamerica.


      Effective Date of the Merger

     The Agreement provides that the Merger will be effective upon the date of 
the filing with the California Secretary of State of a duly executed Merger
Agreement and officers' certificates prescribed by Section 1103 of the GCL or
upon any subsequent date set forth in the Merger Agreement (the "Effective
Time"). The date on which the Merger is effective as specified in the Merger
Agreement is referred to herein as the Effective Date. Although the parties have
not adopted any formal timetable, it is presently anticipated that the Merger
will be consummated on or prior to April 30, 1995, assuming all the conditions
set forth in the Agreement are theretofore satisfied or waived.


      Exchange Ratio; Conversion of Shares of CapitolBank Common Stock

     At the Effective Time, by virtue of the Merger and without any action on 
the part of the holders of CapitolBank Shares, each issued and outstanding
CapitolBank Share (other than fractional shares or any shares as to which
dissenters' rights have been perfected) will be converted into .0938 of a fully
paid, nonassessable and registered Westamerica Share, subject to certain
potential downward adjustments. See "--Possible Adjustments to Exchange Ratio or
Termination of the Agreement." All such CapitolBank Shares shall no longer be
outstanding and shall automatically be canceled and retired and shall cease to
exist, and each certificate previously representing any such shares shall
thereafter represent the Westamerica Shares into which such CapitolBank Shares
have been converted. Certificates previously representing CapitolBank Shares
shall be exchanged for certificates representing whole shares of Westamerica
Common Stock issued in consideration therefor upon the surrender of such
certificates. From and after the Effective Date, the holders of certificates
formerly representing CapitolBank Shares shall cease to have any rights with
respect thereto other than any dissenters' rights they may perfect pursuant to
Chapter 13 of the GCL.  See "Dissenters' Rights of Appraisal."


Possible Adjustments to Exchange Ratio or Termination of the Agreement

     The Agreement provides that the Exchange Ratio may be adjusted as more 
fully described below.  The effect of the adjustments would be to reduce the 
Exchange Ratio below .0938.

                                      -37-
<PAGE>
 
     If the average of the closing price of Westamerica Common Stock quoted on 
the Nasdaq National Market ("NNM") (calculated by taking an average of the
closing prices quoted on NNM as reported in The Wall Street Journal for each of
the twenty consecutive trading days prior to two business days prior to the
Effective Date, rounded to 4 decimal places, whether or not trades occurred on
those days (the "Average Price")) is above $33.00 (with no adjustment if the
Average Price is between $30.20 and $33.00), the Exchange Ratio will be adjusted
downward by one half of the amount by which the Average Price is above $33.00,
according to the following formula:


                                   (Average Price + $33.00)/2
                          .0938 x  --------------------------
                                         Average Price

     There is no ceiling in the Agreement which would limit the amount of the 
Average Price in the above formula. The following table illustrates a range of
possible Exchange Ratios assuming Average Prices of Westamerica Common Stock
between $33.00 and $36.00 per share.

<TABLE> 
<CAPTION> 
                  Average Price of
              Westamerica Common Stock            Exchange Ratio
              ------------------------            --------------
                      <S>                           <C> 
                      33.00                           .0938 
                      33.25                           .0934 
                      33.50                           .0931 
                      33.75                           .0928 
                      34.00                           .0924 
                      34.25                           .0921 
                      34.50                           .0918 
                      34.75                           .0914 
                      35.00                           .0911 
                      35.25                           .0908 
                      35.50                           .0905 
                      35.75                           .0902 
                      36.00                           .0899  
</TABLE>

     The Exchange Ratio shall be adjusted downward for any Significant
Liabilities (as defined below) if in the aggregate these Significant Liabilities
total more than $150,000. As of the date hereof, bonuses payable to CapitolBank
employees and the Tyler v. Wickland litigation, which would constitute
Significant Liabilities, totaled $280,000. "Significant Liabilities," as used in
the Agreement, means those liabilities or expenses (whether operating or capital
in nature) relating to those categories and events described in the next
sentence which have not been reflected as reductions to CapitolBank's
consolidated book value pursuant to generally accepted accounting principles as
of September 30, 1994; provided, however, that any individual component of the
$150,000 aggregate amount must reasonably be estimated to exceed $25,000.
Significant Liabilities consist of the following categories or events, provided
that Significant Liabilities will not include any of the following to which
Westamerica has consented in writing: (i) new or extended contractual
obligations; (ii) new or extended leases of real or personal property; (iii)
acquisition of capital assets (or commitments to do so); (iv) new or expanded
contingent liabilities based upon threatened or pending litigation or other
proceedings or hazardous or toxic substances and legal fees and costs (whether
actual or estimated) related thereto; (v) any expenses, fines, fees, penalties
or similar obligations, except those which arose in the Ordinary Course of
Business (as defined in Section 3.2(h)(i) of the Agreement); (vi) any new,
expanded or accelerated pension or other benefits, including employment
contracts and severance payments, whether or not vested; and (vii) the aggregate
amount of the difference between the per share exercise price of any stock
options or stock appreciation rights granted after June 30, 1994, by CapitolBank
and $3.00.

     The amount of the Significant Liabilities in the case of the arrangements 
described in (i), (ii), and (vi) above, shall (a) equal any payment that could
be made as of the Effective Date that would terminate the arrangement without
further liability or expense to CapitolBank or Westamerica or (b) if the
arrangement does not provide for such a payment, the present value of the amount
of the remaining payments payable pursuant to the arrangement after the
Effective Date using a discount rate equivalent to Westamerica's then current
cost of funds. The

                                      -38-
<PAGE>
 
amount of Significant Liabilities in the case of (iii) above will equal the
amount expended or required to be expended under binding commitments for a
capital asset, minus the amount for which the capital asset could actually be
sold on a liquidation basis. Significant Liabilities shall not include fees of
CapitolBank's financial advisors or CapitolBank's legal fees directly
attributable to this Merger. Significant Liabilities do not include
approximately $200,000 already accrued for CapitolBank's 1994 bonus pool,
approximately $140,000 for CapitolBank's employee retention contracts and all
amounts payable to Thayer T. Prentice and William J. Martin totaling $150,000
and $125,000, respectively, pursuant to their respective employment agreements
with CapitolBank dated as of March 30, 1994 and April 2, 1994. See "Certain
Considerations--Interests of CapitolBank Officers and Directors in the Merger."
As a result of any Significant Liabilities through the close of business on the
day preceding the Effective Date, the Exchange Ratio shall be reduced by an
amount calculated as follows, provided that not more than $1,000,000 of such
Significant Liabilities shall be taken into account:

                                       (Significant Liabilities)
                              .0938 -  -------------------------
                                             $130 Million

     It is anticipated that CapitolBank, as of the Effective Date, will have 
incurred an expense of $260,000 pursuant to its 1994 bonus pool ($60,000 more
than currently accrued and excluded from the definition of Significant
Liabilities). CapitolBank has also incurred other Significant Liabilities,
including new or expanded contingent liabilities based upon pending litigation
which, as of January __, 1995, aggregated $220,000. Such costs and expenses 
could rise considerably. See "Certain Considerations--Tyler v. Wickland." The
following table illustrates a range of possible Exchange Ratios assuming
Significant Liabilities between $150,000 and $1,000,000 and certain possible
Exchange Ratios from the above table.

<TABLE>
<CAPTION>
 
     Certain Possible                   Level of Significant Liabilities
      Exchange Ratios      -----------------------------------------------------
     From Above Table        $150,000  $362,500  $575,000  $787,500   $1,000,000
- -------------------------  ----------  --------  --------  --------   ----------
<S>                           <C>       <C>       <C>       <C>          <C> 
         .0938                .0938     .0910     .0894     .0877        .0861  
         .0934                .0934     .0906     .0890     .0873        .0857  
         .0931                .0931     .0903     .0887     .0870        .0854  
         .0928                .0928     .0900     .0884     .0867        .0851  
         .0924                .0924     .0896     .0880     .0863        .0847  
         .0921                .0921     .0893     .0877     .0860        .0844  
         .0918                .0918     .0890     .0874     .0857        .0841  
         .0914                .0914     .0886     .0870     .0853        .0837  
         .0911                .0911     .0883     .0867     .0850        .0834  
         .0908                .0908     .0880     .0864     .0847        .0831  
         .0905                .0905     .0877     .0861     .0844        .0828  
         .0902                .0902     .0874     .0858     .0841        .0825  
         .0899                .0899     .0871     .0855     .0838        .0822  
</TABLE>

     If the Average Price is below $30.20 as of two business days preceding the 
Effective Date, CapitolBank may accept the Exchange Ratio as adjusted for any
Significant Liabilities or Westamerica and CapitolBank will have the right, but
not the obligation, to renegotiate the Exchange Ratio. Should CapitolBank fail
to accept the Exchange Ratio as described in the preceding sentence or should
the parties fail to renegotiate the Exchange Ratio, CapitolBank may terminate
the Agreement. See "--Amendment; Termination."


Exchange of CapitolBank Stock Certificates; Fractional Interests

     Prior to the Effective Date, Westamerica has agreed to appoint Chemical 
Trust Company of California or its successor, or any other bank or trust company
(having capital of at least $50 million) mutually acceptable to CapitolBank and
Westamerica, as exchange agent (the "Exchange Agent") for the purpose of
exchanging certificates representing the CapitolBank Shares, and at and after
the Effective Date, Westamerica will issue and deliver to the Exchange Agent
certificates representing the Westamerica Shares, to be delivered to holders of
CapitolBank Shares. As soon as practicable after the Effective Date, each holder
of CapitolBank Shares, upon surrender to the 

                                      -39-
<PAGE>
 
Exchange Agent of one or more certificates for such CapitolBank Shares for
cancellation, will be entitled to receive a certificate representing the number
of Westamerica Shares into which such number of CapitolBank Shares will have
been converted and a payment in cash with respect to fractional shares, if any.
Each certificate representing Westamerica Shares will bear a notation
incorporating the terms of the Amended and Restated Rights Agreement by
reference and will evidence the Rights as set forth in and subject to the terms
of the Amended and Restated Rights Agreement. Certificates issued for the
Westamerica Shares shall be deemed to be certificates for Rights. For a
discussion of the Amended and Restated Rights Agreement, see "Description of
Westamerica Capital Stock and Indebtedness--Shareholder Rights Plan."

     No dividends or other distributions of any kind which are declared payable 
to shareholders of record of the Westamerica Shares on or after the Effective
Date will be paid to persons entitled to receive such certificates for
Westamerica Shares until such persons surrender their certificates representing
CapitolBank Shares. Upon surrender of certificates representing CapitolBank
Shares, the holder thereof shall be paid, without interest, any dividends or
other distributions with respect to the Westamerica Shares as to which the
record date and payment date occurred on or after the Effective Date and on or
before the date of surrender.

     If any certificate for Westamerica Shares is to be issued in a name other 
than that in which the certificate for CapitolBank Shares surrendered in
exchange therefor is registered, it shall be a condition of such exchange that
the person requesting such exchange shall pay to the Exchange Agent any transfer
costs, taxes or other expenses required by reason of the issuance of
certificates for such Westamerica Shares in a name other than the registered
holder of the certificate surrendered, or such persons shall establish to the
satisfaction of Westamerica and the Exchange Agent that such costs, taxes or
other expenses have been paid or are not applicable.

     All dividends or distributions, and any cash to be paid in lieu of
fractional shares, if held by the Exchange Agent for payment or delivery to the
holders of unsurrendered certificates representing CapitolBank Shares and
unclaimed at the end of one year from the Effective Date, shall (together with
any interest earned thereon) at such time be paid or redelivered by the Exchange
Agent to Westamerica, and after such time any holder of a certificate
representing CapitolBank Shares who has not surrendered such certificate to the
Exchange Agent shall, subject to applicable law, look as a general creditor only
to Westamerica for payment or delivery of such Westamerica Shares and dividends
or distributions or cash, as the case may be.

     No fractional shares of Westamerica Common Stock shall be issued to 
holders of CapitolBank Shares. In lieu thereof, each such holder entitled to a
fraction of a share of Westamerica Common Stock shall receive, at the time of
surrender of the certificate or certificates representing such holder's
CapitolBank Shares, an amount in cash equal to the Average Price multiplied by
the fraction of a share of Westamerica Common Stock to which such holder
otherwise would be entitled. No such holder shall be entitled to dividends,
voting rights, interest on the value of, or any other rights in respect of a
fractional share.


Treatment of Stock Options

     Each person holding one or more options to purchase CapitolBank Shares 
pursuant to the CapitolBank Sacramento 1992 Stock Option Plan (the "CapitolBank 
Stock Option Plan") will have the right, in his or her discretion, to:

            (i) exercise any vested options granted under the CapitolBank Stock
     Option Plan to acquire CapitolBank Shares prior to the Effective Date and
     CapitolBank will facilitate the exercise of those options by allowing the
     options to be exercised and taxes paid by CapitolBank withholding the
     appropriate number of shares from the shares subject to the options or by
     any other method permitted by applicable law; and/or

            (ii) have any options, whether or not vested, that are not 
     exercised converted into options to purchase shares of Westamerica Common 
     Stock.

     Following the Effective Date, shares of Westamerica Common Stock will be 
substituted under the options for CapitolBank Shares based on the Exchange Ratio
(as may be further adjusted for any Significant Liabilities), 

                                      -40-
<PAGE>
 
as applicable, in a form acceptable to Westamerica. Specifically, each option
will be deemed to continue as an option to purchase the number of shares of
Westamerica Common Stock equal to the Exchange Ratio, as adjusted, multiplied by
the number of CapitolBank Shares previously covered by such option at an option
exercise price for each such share of Westamerica Common Stock equal to the
previous option exercise price for each CapitolBank Share divided by the
Exchange Ratio. Each CapitolBank stock option will otherwise continue on terms
and conditions that are consistent with those that were applicable immediately
before the Effective Date.

     Notwithstanding the foregoing, the Option Plan Committee exercised its 
discretion under the CapitolBank Stock Option Plan to fully vest the options of
William J. Martin and Thayer T. Prentice so that such options may be exercised
in full, subject to the occurrence of the Merger on the Effective Date, using
the share withholding method. Following the exercise of the options and the
payment of taxes using the share withholding method, CapitolBank will hold the
net remaining shares until the Effective Date, at which time the CapitolBank
Shares will be exchanged for Westamerica Common Stock, based on the Exchange
Ratio. The Westamerica Common Stock will be delivered to Messrs. Martin and
Prentice with legends affixed with the resale restrictions of Rule 145 of the
Securities Act of 1933.

     Subsequent to the Effective Date, Westamerica intends to register the
CapitolBank Stock Option Plan under the Securities Act by filing a Form S-8
Registration Statement with the Securities and Exchange Commission. The
CapitolBank Stock Option Plan may be terminated as of the Effective Date, but
options granted pursuant to said Option Plan and outstanding on or prior to the
Effective Date which are converted into options to purchase Westamerica Shares
will continue to be governed by terms and conditions consistent with said
CapitolBank Stock Option Plan.

     As of the Record Date, options to acquire 319,467 shares of CapitolBank 
Common Stock were outstanding under the CapitolBank Stock Option Plan. See
"Certain Considerations--Interests of CapitolBank Officers and Directors in the
Merger."


Covenants of Westamerica and CapitolBank; Conduct of Business Prior to the 
Merger

     The Agreement contains covenants of Westamerica and CapitolBank
concerning, among other things, (i) the cooperation of each party to obtain all
necessary or appropriate government approvals in order to cause the Merger to be
consummated; (ii) the prompt notification by either party of any event which
would cause or constitute a breach of any of the representations and warranties
of that party; (iii) the right of each party to review the other party's books
and records and the delivery of financial statements; (iv) the cooperation by
both parties in the issuance of any press releases; (v) restrictions by either
party to enter into a merger, consolidation, or other takeover proposal
involving any third party; (vi) restrictions on the payment of dividends; (vii)
the merging of CapitolBank's employee welfare benefits plan into Westamerica's
employee welfare benefits plan; and (viii) the outsourcing of various
CapitolBank banking functions (which will include, but are not limited to, item
processing, data processing, loan documentation, facilities management,
investment portfolio management, loan review, internal audit and account
servicing) to Westamerica.

     The Agreement provides that CapitolBank shall conduct its business in the 
ordinary course as such business was conducted prior to entering into the
Agreement. The Agreement further provides that CapitolBank will not, without the
prior written consent of Westamerica, among other things, (i) commit to any loan
with a principal amount in excess of $50,000; (ii) purchase any investment
security with a maturity in excess of two years, or sell any investment security
in which a gain is recognized; (iii) issue any certificate of deposit with a
rate of interest in excess of 6%; (iv) commit to new capital commitments or
expenditures in excess of $25,000; (v) commit to any new contract or extend any
existing contract that would obligate CapitolBank for an aggregate amount over
time in excess of $25,000; (vi) accelerate the vesting of pension or other
benefits; (vii) grant any new stock options or accelerate the vesting of any
existing stock options; and (viii) make or approve any increase in the
compensation payable to any director, officer, employee or agent with an annual
salary in excess of $40,000.

     Except with the prior written consent of Westamerica, CapitolBank has
agreed to not amend its Articles of Incorporation or Bylaws; make any change in
its respective authorized, issued or outstanding capital stock or any other
equity security; issue, sell, pledge, assign or otherwise encumber or dispose
of, or purchase, redeem or 

                                      -41-
<PAGE>
 
otherwise acquire, any of its shares of capital stock or other equity securities
or enter into any agreement, call or commitment of any character to do so; grant
or issue any stock option relating to, right to acquire, or security convertible
into, shares of its capital stock or other equity security; purchase, redeem,
retire or otherwise acquire (other than in a fiduciary capacity) any shares of,
or any security convertible into, capital stock or other equity securities, or
agree to do any of the foregoing.

     CapitolBank has agreed to promptly notify Westamerica in writing upon
becoming aware of the occurrence of any of the following: (i) the classification
of any loan as substandard, doubtful or loss; (ii) the filing or commencement of
any legal action or other proceeding or investigation against CapitolBank (or
any director or executive officer); or (iii) the monthly pre-tax earnings of
CapitolBank are less than $50,000.

     Business Combination.  Subject to the fiduciary obligations of 
CapitolBank's Board of Directors, CapitolBank has agreed that it will not prior
to the Effective Time, make any offer to any third party or accept any offer
from any third party regarding a business combination ("Business Combination"),
acquire or agree to acquire any of their own capital stock or the capital stock
or assets of any other entity, or commence any proceedings for winding up and
dissolution affecting either of them other than the transactions explicitly
contemplated by the Agreements. In addition, neither CapitolBank nor any
officer, director or affiliate thereof, nor any investment banker, attorney,
accountant or other agent, advisor or representative retained by CapitolBank,
will (i) solicit or encourage or take any other actions to facilitate or enter
into any Business Combination; (ii) disclose any nonpublic information to any
corporation or entity concerning the business and properties of CapitolBank or
afford any such party access to the properties, books or records of CapitolBank;
or (iii) furnish or cause to be furnished any information concerning the
business, financial condition, operations, property or prospects of CapitolBank
to another person having any actual or prospective role with respect to any such
transaction. The Agreement also requires CapitolBank to notify Westamerica
within two business days of the receipt by it of any indication of interest in
any Business Combination, as such term is defined in the Agreement.

     In the event the Board of Directors of CapitolBank receives a bona fide 
offer for a Business Combination and reasonably determines that its duty to act
or refrain from acting pursuant to the Agreement is inconsistent with its
continuing fiduciary duties to the shareholders of CapitolBank, its duty to act
or refrain from acting pursuant to the Agreement is excused and will not
constitute a breach of the Agreement, or create any claim or cause of action
asserting any liability against any member of the Board of Directors of
CapitolBank. In the event CapitolBank fails to act or refrains from doing any
act as contemplated by the Agreement, Westamerica is entitled to terminate the
Agreement without any liability to CapitolBank and CapitolBank shall pay to
Westamerica, on demand, the sum of $600,000.

     CapitolBank has also agreed to make available to Westamerica, upon 
request, a list of its shareholders and their addresses, a list showing all
transfers of CapitolBank Common Stock and such other information as Westamerica
reasonably requests regarding both ownership and prior transfers of such stock.


Management and Operations Following the Merger

     On the Effective Date, CapitolBank will be merged with and into Merger 
Sub, at which time CapitolBank will become a wholly-owned subsidiary bank of
Westamerica. All rights, franchises and interests of Merger Sub will be assumed
by and vested in CapitolBank. The Articles of Incorporation and Bylaws of
CapitolBank in effect immediately prior to the Effective Date shall be and
continue to be the Articles of Incorporation and Bylaws of CapitolBank following
the Merger, and the directors and officers of Westamerica Bank prior to the
Effective Date will be the directors and officers of CapitolBank following the
Merger.

     As soon as practical following the Effective Date, Westamerica intends to 
merge CapitolBank into Westamerica Bank. Subject to regulatory approval, the
office of CapitolBank will become a branch of Westamerica Bank, and serve as the
Sacramento regional headquarters of Westamerica Bank. In furtherance of this
objective, Westamerica Bank intends to file applications with the Superintendent
and the FRBSF seeking permission to merge CapitolBank into Westamerica Bank.
Westamerica
                                      -42-
<PAGE>
 
Bank is a California state-chartered member of the Federal Reserve System. It is
expected that the Sacramento region will be managed by Westamerica's current
Regional Market Manager, Randall E. Reynoso.

     CapitolBank has agreed that CapitolBank's employee benefit plans, as
defined in section 3(3) of the Employee Retirement Income Security Act of 1974,
as amended, may be terminated, modified or merged into Westamerica's employee
benefit plans before, on or after the Effective Date, as determined by
Westamerica in its sole discretion. CapitolBank has also agreed that the
CapitolBank 401(k) Plan may be terminated, frozen, modified or merged into the
Westamerica 401(k) Plan immediately before, on or after the Effective Date, as
determined by Westamerica in its sole discretion, subject to compliance with
applicable law.

     It is expected that all data processing, check processing, bookkeeping, 
consumer lending, residential real estate lending, accounting, internal auditing
and all other administrative functions of CapitolBank, except for branch
functions and regional management functions described above, will be centralized
with Westamerica Bank's other similar functions.


Representations and Warranties; Conditions to the Merger

     The Agreement contains representations and warranties by Westamerica and 
CapitolBank regarding, among other things, their respective organization,
authorization to enter into the Agreements, corporate power to carry out the
terms of the Agreements, capitalization and the accuracy of their respective
financial statements. CapitolBank has made further representations and
warranties to Westamerica regarding regulatory proceedings, the timely filing of
tax returns, title to its real property, certain environmental liabilities,
employment contracts and benefits and various aspects of its loans and other
assets.

     The Merger will occur only if all required government approvals are in 
effect or have been obtained (without the imposition of any materially
burdensome conditions as determined by Westamerica in its reasonable judgment)
(see "--Required Regulatory Approvals"), the Agreements are approved by the
majority of the outstanding shares of CapitolBank Common Stock and the
representations and warranties of the parties are true and correct in all
material respects on and as of the Effective Date.

     Consummation of the Merger is subject to satisfaction of certain other 
conditions or the waiver of such conditions by the party entitled to do so. Such
conditions include, among other things, the following: (i) except as disclosed
to Westamerica in writing prior to November 17, 1994, the absence of a material
adverse change since December 31, 1993, in the business, financial condition or
results of operations of either party; (ii) a letter from counsel to CapitolBank
to the effect that CapitolBank will be reimbursed for expenses and other costs
arising out of the Tyler v. Wickland litigation (see "Certain Considerations--
Tyler v. Wickland"); (iii) the absence of significant legal impediments to the
Merger; (iv) the effectiveness of a registration statement with respect to the
Westamerica Common Stock to be issued to CapitolBank shareholders as a result of
the Merger; (v) the receipt, by Westamerica and CapitolBank, of opinions of
counsel to Westamerica to the effect that, among other things, under federal and
state tax laws, the Merger will not result in any recognized gain or loss to
Westamerica or CapitolBank and, except for any cash received in lieu of any
fractional shares, no gain or loss will be recognized by holders of CapitolBank
Common Stock who receive Westamerica Common Stock in exchange for the
CapitolBank Common Stock which they hold (see "--Certain Tax Consequences");
(vi) receipt of letters and reports from CapitolBank's independent public
accountants relating to the Registration Statement and CapitolBank's unaudited
financial statements; (vii) receipt by CapitolBank of a fairness opinion from
its financial advisors; and (viii) receipt of a letter from Westamerica's
independent public accountants to the effect that the Merger will qualify for
the pooling of interests method of accounting in accordance with generally
accepted accounting principles (see "--Accounting Treatment").

     Based on circumstances existing at the date hereof, counsel to CapitolBank 
would be unable to issue a letter regarding reimbursement for expenses and other
costs arising out of Tyler v. Wickland which would satisfy the above condition.
See "Certain Considerations--Tyler v. Wickland."

     In addition, certain other conditions must be satisfied, or be waived by 
Westamerica, in order for Westamerica to be obligated to consummate the Merger,
including the conditions that (i) the aggregate number of 

                                      -43-
<PAGE>
 
shares of CapitolBank Common Stock held by persons who have taken all of the
steps required to perfect their right (if any) to be paid the fair market value
of such shares under the GCL shall not exceed 9% of the outstanding shares of
CapitolBank Common Stock; (ii) CapitolBank has delivered to Westamerica an
opinion of its loan review examiner, acceptable to Westamerica, to the effect
that all loan losses in excess of $25,000 have been identified; (iii)
CapitolBank has received all consents of third parties which are required to be
received by it, if any; and (iv) the percentage determined by dividing
Classified Loans (as defined in the Agreement) by the sum of equity capital
(excluding adjustments required by FASB No. 115) plus reserves for loan losses
as of December 31, 1994, at the month end immediately preceding the Effective
Date and two business days prior to the Effective Date shall be no greater than
42%.


Required Regulatory Approvals

     The Merger must be approved by the Board of Governors of the Federal
Reserve System (the "Federal Reserve Board") pursuant to the provisions of the
Bank Holding Company Act of 1956, as amended (the "BHC Act"). This federal
statute provides that no transaction may be approved which would result in a
monopoly or which (i) 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, or (ii) whose effect in any section of the country may be
substantially to lessen competition, or to tend to create a monopoly, or which
in any manner would be in restraint of trade, unless the Federal Reserve Board
finds that the anticompetitive effects of the proposed transaction are clearly
outweighed in the public interest by the probable effect of the transaction in
meeting the convenience and needs of the community to be served. In conducting a
review of any application for a merger, the Federal Reserve Board is required to
consider the financial and managerial resources and future prospects of the
companies and the banks concerned, and the convenience and needs of the
community to be served. The Federal Reserve Board has the authority to deny an
application if it concludes that the requirements of the Community Reinvestment
Act of 1977, as amended, are not satisfied.

     Westamerica expects to file a final application to merge CapitolBank into 
Westamerica in January 1995 or January 1995. Receipt of final regulatory
approval by the Federal Reserve Board is a pre-condition to the consummation of
the Merger under the terms of the Agreement. See "--Representations and
Warranties; Conditions to the Merger." Westamerica expects that the Federal
Reserve Board will act on and approve its application in the first or second
quarter of 1995.

     A transaction approved by the Federal Reserve Board may not be consummated 
for 15 days after such approval. During such period, the Department of Justice
may commence a legal action challenging the transaction under federal antitrust
laws. If the Department of Justice does not commence a legal action during such
15-day period, it may not thereafter challenge the transaction except in an
action commenced under the antimonopoly provisions of Section 2 of the Sherman
Antitrust Act.

     The BHC Act provides for the publication of notice and the opportunity for 
administrative hearings relating to an application for approval under the BHC
Act and authorizes the Federal Reserve Board to permit interested parties to
intervene in the proceedings. If an interested party is permitted to intervene,
such intervention could substantially delay the regulatory approval required for
consummation of the Merger.

     Based on current precedents, the respective managements of Westamerica and 
CapitolBank believe that the Merger will be approved by the Federal Reserve
Board and the Merger will not be subject to challenge by the Department of
Justice under federal antitrust laws. However, no assurance can be provided that
the Federal Reserve Board or the Department of Justice will concur in this
assessment or that, in connection with the grant of any approval by the Federal
Reserve Board, any action taken, or statute, rule, regulation or order enacted,
entered, enforced or deemed applicable to the Merger, will not contain
conditions which are materially burdensome to Westamerica within the meaning of
the Agreement. If a materially burdensome condition is imposed in connection
with a government approval, a condition to Westamerica's obligation to
consummate the Merger will be deemed not to have occurred and Westamerica would
have the right to terminate the Agreement. If the Agreement is 

                                      -44-
<PAGE>
 
terminated by Westamerica due to a materially burdensome condition imposed in
connection with a government approval or because of a failure to obtain all
government approvals for whatever reason, upon demand and subject to
CapitolBank's cooperation in all reasonable respects to obtain the government
approvals, Westamerica will pay CapitolBank $1,200,000.


Trading Markets for Stock Listing

     The Westamerica Common Stock is listed on NNM.  Westamerica intends to 
cause the shares of Westamerica Common Stock to be issued in the Merger and the
shares of Westamerica Common Stock to be reserved for issuance upon the exercise
of existing CapitolBank stock options to be approved for listing on NNM, subject
to official notice of issuance, prior to the Effective Date.

     The CapitolBank Common Stock is currently traded on the over-the-counter 
market and quoted on the "pink sheets" published by the National Quotation
Bureau, Inc. (the "Pink Sheets"). If the Merger is consummated, Westamerica will
take appropriate action to cause the CapitolBank Common Stock to cease to be
quoted on the Pink Sheets and public trading of such shares will cease.


Stock Option Agreement

     The following is a summary of the material provisions of the Stock Option 
Agreement entered into between Westamerica and CapitolBank immediately following
the execution of the Agreement (the "Stock Option Agreement"), a copy of which
is attached as Annex D to this Proxy Statement/Prospectus and is incorporated
herein by reference. This summary is qualified in its entirety by reference to
the text of the Stock Option Agreement set forth in Annex D. Certain capitalized
terms which are used but not defined in this subsection are defined in the Stock
Option Agreement.

     Shares Subject to the Option.  The Stock Option Agreement provides for the 
purchase by Westamerica of up to 403,949 shares, subject to certain adjustments,
of CapitolBank Common Stock (the "Option Shares") at an exercise price, subject
to certain adjustments, of $2.27 per share, payable in cash (the "Stock
Option"). The Option Shares, if issued pursuant to the Stock Option Agreement,
would represent approximately 9.9% of the issued and outstanding shares of
CapitolBank's Common Stock without giving effect to the issuance of any shares
pursuant to an exercise of the Stock Option, and in no event will the number of
Option Shares exceed 9.9% of issued and outstanding shares of CapitolBank Common
Stock.

     Adjustment of Number of Shares Subject to the Option.  The number of 
shares of CapitolBank Common Stock subject to the Stock Option will be increased
to the extent that CapitolBank issues additional shares of CapitolBank Common
Stock (other than pursuant to an exercise of the Stock Option) such that the
number of Option Shares will continue to equal 9.9% of the then issued and
outstanding shares of CapitolBank Common Stock without giving effect to the
issuance of shares pursuant to an exercise of the Stock Option.

     Exercise of Option.  The Option is exercisable only if both an Initial 
Triggering Event and a Subsequent Triggering Event occur prior to the 
termination of the Option.

     "Initial Triggering Event" is defined as the occurrence of any of the
following events:

     (i) CapitolBank or any of its subsidiaries, without Westamerica's prior 
written consent, enters into an agreement with any person or group (other than
Westamerica or any subsidiary thereof) to engage in, or the CapitolBank Board of
Directors recommends that the shareholders of CapitolBank Common Stock approve
or accept (other than as contemplated by the Agreement) (x) a merger or
consolidation, or similar transaction, involving CapitolBank or any significant
subsidiary of CapitolBank, (y) the purchase, lease, or other acquisition
representing 15% or more of the consolidated assets of CapitolBank and its
subsidiaries, or (z) the purchase, lease or other acquisition (including by way
of merger, consolidation, share exchange or otherwise) of securities

                                      -45-
<PAGE>
 
representing 10% or more of the voting power of any class of securities of
CapitolBank (each of the transactions described in the preceding clauses (x),
(y) and (z) being referred to herein as an "Acquisition Transaction");

     (ii) CapitolBank or any of its subsidiaries, without having received
Westamerica's prior written consent, shall have authorized, recommended,
proposed or publicly announced its intention to authorize, recommend or propose,
an agreement to engage in an Acquisition Transaction with any person other than
Westamerica or a subsidiary thereof, or the CapitolBank Board of Directors shall
have publicly withdrawn or modified, or publicly announced its intent to
withdraw or modify, its recommendation that the shareholders of CapitolBank
approve the transactions contemplated by the Agreement;

     (iii)  any person or group (other than Westamerica, any subsidiary thereof 
or any CapitolBank subsidiary acting in a fiduciary capacity) shall acquire
beneficial ownership or the right to acquire beneficial ownership of 10% or more
of the outstanding shares of CapitolBank Common Stock;

     (iv) any person or group (other than Westamerica or any subsidiary 
thereof) shall make a bona fide proposal to CapitolBank or its shareholders by
public announcement or written communication, that is or becomes the subject of
public disclosure, to engage in an Acquisition Transaction;

     (v) a third party shall make a proposal to CapitolBank or its shareholders 
to engage in an Acquisition Transaction, followed by CapitolBank breaching any
covenant or obligation contained in the Agreement, such breach entitling
Westamerica to terminate the Agreement, and such breach shall not be cured prior
to the date that Westamerica sends notice of its exercise of the Stock Option to
CapitolBank; or

     (vi) any person or group (other than Westamerica or any subsidiary
thereof), other than in connection with a transaction to which Westamerica has
given its prior written consent, shall file an application or notice with the
Superintendent or the FDIC or other federal or state bank regulatory authority,
which application or notice has been accepted for processing for approval to
engage in an Acquisition Transaction.

     "Subsequent Triggering Event" is defined as either (A) the acquisition by 
any person or group of beneficial ownership of 20% or more of the then
outstanding shares of CapitolBank Common Stock, or (B) the occurrence of the
Initial Triggering Event described in clause (i) above, except that the
percentage referenced in subclause (z) thereof shall be 20%.

     Termination of the Option.  The Stock Option Agreement terminates (i) at 
the Effective Time of the Merger, (ii) upon termination of the Agreement in
accordance with the terms thereof if such termination occurs prior to the
occurrence of an Initial Triggering Event, or (iii) 12 months after termination
of the Agreement following the occurrence of an Initial Triggering Event
(provided that if an Initial Triggering Event occurs after or continues beyond
such termination, the Stock Option will terminate 12 months from the expiration
of the last Initial Triggering Event, but in no event more than 18 months after
such termination).

     Notwithstanding any other provision of the Stock Option Agreement, if a 
Holder, the owner of the Option Shares from time to time (the "Owner"), or
certain related parties offer or propose to engage in an Acquisition Transaction
(other than as contemplated by the Merger Agreement) without the prior written
consent of CapitolBank, then (i) in the case of a Holder or related party
thereof, the Stock Option held by it will immediately terminate and be of no
further force or effect and (ii) in the case of an Owner or any related party
thereof, the Option Shares held by it will be repurchasable by CapitolBank
immediately at the then applicable Stock Option exercise price.

     If the Stock Option terminates under certain circumstances as described 
in the Stock Option Agreement, Westamerica (or any subsequent Holder) may have
as many as 30 days subsequent to such termination to exercise the Stock Option
(or Substitute Option (as hereinafter defined)) in connection with the resale of
CapitolBank Common Stock or other securities pursuant to a registration
statement as provided in the Stock Option Agreement.

     Registration Rights.  Within 30 days (subject to extension as provided in 
the Stock Option Agreement) after a Subsequent Triggering Event and prior to the
termination of the Stock Option, Westamerica (on behalf of

                                      -46-
<PAGE>
 
      itself or any subsequent Holder) may demand that the Stock Option and the
      related Option Shares be registered under the Securities Act. Upon such
      demand, CapitolBank must promptly prepare, file and keep current with the
      Superintendent the equivalent of a shelf registration subject to certain
      exceptions. Westamerica is entitled to two such registrations so long as
      the second request is within 18 months of the first request.

           Repurchase at Option of Westamerica. Within 30 days (subject to
      extension as provided in the Stock Option Agreement) after a Subsequent
      Triggering Event and prior to an Exercise Termination Event, subject to
      regulatory approval and applicable law, CapitolBank is required (i) at the
      request of the Holder, to repurchase the Stock Option from the Holder at a
      price (the "Option Repurchase Price") equal to (A) the amount by which (x)
      the "market/offer price" (as hereinafter defined) exceeds (y) the then
      applicable Stock Option exercise price, multiplied by the number of shares
      for which the Stock Option may then be exercised plus (B) Westamerica's
      Out-of-Pocket Expenses (as hereinafter defined) to the extent not
      previously reimbursed; and (ii) at the request of the Owner, to repurchase
      such number of Option Shares from the Owner as the Owner designates at a
      price per share (the "Option Share Repurchase Price") equal to (A) the
      "market/offer price" multiplied by the number of Option Shares so
      designated plus (B) Westamerica's Out-of-Pocket Expenses to the extent
      said expenses exceed $600,000 and were not previously reimbursed. "Out-of-
      Pocket Expenses" means Westamerica's reasonable out-of-pocket expenses
      incurred in connection with the transactions contemplated by the Merger
      Agreement, including legal, accounting, and investment banking fees.
      "Market/offer price" means the highest of (C) the highest price per share
      of CapitolBank Common Stock at which a tender offer or exchange offer
      therefor has been made, (D) the price per share of CapitolBank Common
      Stock to be paid by any third party pursuant to an agreement with
      CapitolBank, (E) the highest closing price for shares of CapitolBank
      Common Stock quoted on the Pink Sheets or other principal trading market,
      if applicable, within the six-month period immediately preceding the date
      the Holder gives notice of the required repurchase of the Stock Option or
      the Owner gives notice of the required repurchase of Option Shares, as the
      case may be, or (F) in the event of a sale representing 15% or more of
      CapitolBank's net assets, the sum of the price paid in such sale for such
      assets and the current market value of the remaining assets of CapitolBank
      as determined by a nationally recognized investment banking firm, selected
      by the Holder or the Owner, as the case may be, divided by the number of
      shares of CapitolBank Common Stock outstanding at the time of such sale.

           Substitute Option.  In the event that, prior to an Exercise
      Termination Event, CapitolBank enters into an agreement (i) to consolidate
      with or merge into any entity other than Westamerica or any subsidiary
      thereof and shall not be the continuing or surviving corporation of such
      consolidation or merger, (ii) to permit any entity other than Westamerica
      or any subsidiary thereof to merge into CapitolBank with CapitolBank as
      the continuing or surviving corporation, but in connection therewith the
      then outstanding shares of CapitolBank are changed into or exchanged for
      stock or other securities of any other person or cash or any other
      property or the then outstanding shares of CapitolBank Common Stock after
      such merger represent less than 50% of the outstanding shares or share
      equivalents of the merged company, or (iii) to sell or transfer all or
      substantially all of its assets to any entity other than Westamerica or
      any subsidiary thereof, then the Stock Option will be converted into, or
      exchanged for, an option (a "Substitute Option") to purchase shares of
      common stock of, at the Holder's option, either the continuing or
      surviving corporation of a merger or a consolidation, the transferee of
      all or substantially all of CapitolBank's assets, or the person
      controlling such continuing or surviving corporation or transferee.  The
      number of shares subject to the Substitute Option and the exercise price
      per share will be determined in accordance with a formula in the Stock
      Option Agreement.  To the extent possible, the Substitute Option will
      contain other terms and conditions that are the same as those in the Stock
      Option Agreement (after giving effect to the provisions described in the
      following paragraph).

           Repurchase of Substitute Option or Shares.  Subject to regulatory
      approval and applicable law, the issuer of a Substitute Option will be
      required to repurchase such option at the request of the holder thereof
      and to repurchase any shares ("Substitute Shares") of such issuer's common
      stock ("Substitute Common Stock") issued upon exercise of a Substitute
      Option at the request of the owner thereof.  The repurchase price for a
      Substitute Option will equal the amount by which (A) the "Highest Closing
      Price" (as hereinafter defined) exceeds (B) the exercise price of the
      Substitute Option, multiplied by the number of shares of Substitute Common
      Stock for which the Substitute Option may be exercised, plus Westamerica's
      Out-of-Pocket Expenses to the extent said expenses exceed $600,000 and
      were not previously reimbursed.  The repurchase price for Substitute
      Shares shall equal the "Highest Closing Price" multiplied by the number of
      Substitute Shares to be repurchased, plus Westamerica's Out-

                                      -47-
<PAGE>
 
      of-Pocket Expenses to the extent said expenses exceed $600,000 and were
      not previously reimbursed. As used herein, "Highest Closing Price" means
      the highest closing price for shares of Substitute Common Stock within the
      six-month period immediately preceding the date the Holder gives notice of
      the required repurchase of the Substitute Option or the Owner gives notice
      of the required repurchase of Substitute Shares, as the case may be.

           Assignability.  Neither Westamerica nor CapitolBank may assign any of
      its respective rights and obligations under the Stock Option Agreement or
      the Stock Option to any other person without the other party's written
      consent, except that if a Subsequent Triggering Event occurs prior to
      termination of the Stock Option, within 30 days thereafter (subject to
      extension as provided in the Stock Option Agreement), Westamerica, subject
      to the Stock Option Agreement, may assign in whole or in part its rights
      and obligations thereunder.  In addition, until 30 days after the
      Superintendent or the FDIC approves an application by Westamerica to
      acquire the Option Shares, Westamerica may not assign its rights under the
      Stock Option except in (i) a widely dispersed public distribution, (ii) a
      private placement in which no one party acquires the right to purchase in
      excess of 2% of the voting shares of CapitolBank, (iii) an assignment to a
      single party for the purpose of conducting a widely dispersed public
      distribution on Westamerica's behalf, or (iv) any other manner approved by
      the Superintendent or the FDIC.

           Notice of Exercise.  In the event Westamerica (or any subsequent
      Holder) wishes to exercise the Stock Option, it must send to CapitolBank a
      written notice (the date of which is referred to as the "Notice Date")
      specifying (i) the total number of shares it will purchase pursuant to
      such exercise and (ii) a "Closing Date" not less than three nor more than
      60 days from the Notice Date.  If the purchase and sale of the Stock
      Option cannot be consummated because of an applicable judgment, decree,
      order, law or regulation, the period of time referred to in this paragraph
      shall run from the date that the restriction on consummation lapses.  If
      prior notification to or approval by the Superintendent or the FDIC is
      required, Westamerica (or any subsequent Holder) will promptly file the
      required notice or application.  In such a case, the period of time
      referred to in this paragraph will run from the date the notification
      period expires or any necessary approval is granted.

           The rights and obligations of Westamerica under the Stock Option
      Agreement are subject to receipt of any required regulatory approval.
      Generally, without the prior approval of the Federal Reserve Board,
      Westamerica may not acquire more than 5% of the outstanding Common Stock
      of CapitolBank.  Westamerica intends to file an application for such
      approval as soon as practicable.  See "--Required Regulatory Approvals."

           The Stock Option could have the effect of discouraging persons who
      now or prior to the Effective Time might be interested in acquiring all of
      or a significant interest in CapitolBank from considering or proposing
      such an acquisition, even if such persons were prepared to pay more
      consideration per share for CapitolBank Common Stock than the
      consideration per share payable under the Agreement.


      Noncompetition Agreements

           Each nonemployee director of CapitolBank has entered into a
      noncompetition agreement (collectively, the "Noncompetition Agreements")
      with Westamerica.  Under the Noncompetition Agreements signed by J. Al
      Wickland, Jr. and John A. Wickland III, as of the Effective Time, except
      as a director, officer or employee of Westamerica or any subsidiary
      thereof, J. Al Wickland, Jr. and John A. Wickland III have each agreed
      that, without the prior written consent of Westamerica, they will not at
      any time within the two-year period immediately following the consummation
      of the Merger (i) directly or indirectly, within Sacramento County in the
      State of California, whether or not for compensation, engage in, or have
      any material interest in, any person, firm, corporation, or business
      (whether as an employee, officer, director, agent, shareholder holding,
      directly or indirectly, 5% or more of the voting securities thereof,
      partner, consultant, adviser, holder of any substantial beneficial
      ownership interest or otherwise) that engages in any activity within
      Sacramento County which is the same as, similar to, or competitive with
      any activity now engaged in by CapitolBank as long as CapitolBank,
      Westamerica, or any transferee of all or substantially all of the assets
      of Westamerica, CapitolBank or their subsidiaries or any other successor
      thereof shall engage in such activity, except that nothing shall prohibit
      any of the CapitolBank directors from providing professional services,
      such as legal or accounting advice, to clients; or (ii) induce any
      employee of CapitolBank to leave the employ of Westamerica or any
      subsidiary thereof.  In addition, the Noncompetition Agreements signed by
      each of the other nonemployee directors provide that, without the prior

                                      -48-
<PAGE>
 
      written consent of Westamerica, each such director will not at any time
      within the two-year period immediately following the consummation of the
      Merger, directly or indirectly, within Sacramento County in the State of
      California, whether or not for compensation, engage in, or have any
      material interest in any person, firm, corporation or business which
      engages in soliciting or making loans to or attracting or soliciting
      insured financial institution deposits from customers of or otherwise
      contacting individuals or entities doing business with CapitolBank
      regarding CapitolBank's banking or trust business as of the date hereof as
      long as CapitolBank, Westamerica, or any transferee of all or
      substantially all of the assets of Westamerica, CapitolBank or their
      subsidiaries or any successor thereof shall engage in such activity.

           Each nonemployee director has also agreed to treat as confidential
      all information concerning the records, properties, books, contracts,
      commitments and affairs of Westamerica, CapitolBank or their respective
      subsidiaries including but not limited to, information regarding
      accounts, shareholders, finances, strategies, marketing, customers,
      customer lists and potential customers (their identities, preferences,
      likes and dislikes) and other information of a similar nature not
      available to the public.  If a Noncompetition Agreement is terminated or
      expires, each nonemployee director shall continue to treat all such
      information as confidential and shall return such documents and any
      electronic storage media containing such information as shall reasonably
      be requested by Westamerica.


      Certain Tax Consequences

           In order to satisfy one of the conditions to consummation of the
      Merger (see "--Representations and Warranties; Conditions to the Merger"),
      Westamerica and CapitolBank each expects to receive, with respect to
      United States federal income tax law and California state tax law, an
      opinion from Westamerica's counsel to the effect that, based upon the
      assumptions and understandings contained in the opinion, the Merger will
      be part of a reorganization within the meaning of section 368(a) of the
      Internal Revenue Code of 1986, as amended (the "IRC"), and that,
      accordingly, for United States federal income tax, California personal
      income and California franchise tax purposes:

                (i)  the Merger will not result in any recognized gain or loss
           to Westamerica or CapitolBank;

                (ii)  no gain or loss will be recognized by holders of
           CapitolBank Common Stock who receive solely Westamerica Common Stock
           in exchange for the CapitolBank Common Stock which they hold;

                (iii)  the holding period of Westamerica Common Stock exchanged
           for CapitolBank Common Stock will include the holding period of the
           CapitolBank Common Stock for which it is exchanged, assuming the
           shares of CapitolBank Common Stock are capital assets in the hands of
           the holder thereof at the Effective Date;

                (iv)  a holder of CapitolBank Common Stock receiving cash in the
           exchange in lieu of a fractional interest in Westamerica Common Stock
           will be treated as if such holder actually received such fractional
           share interest which was subsequently redeemed by Westamerica,
           resulting in the cash such holder receives in lieu of such fractional
           share interest being treated as having been received as full payment
           in exchange for stock redeemed as provided in section 302(a) of the
           IRC; and

                (v)  the basis of the Westamerica Common Stock received in the
           exchange will be the same as the basis of the CapitolBank Common
           Stock for which it was exchanged, less any basis attributable to
           fractional shares for which cash is received.

           Westamerica and CapitolBank believe that each person who holds an
      unexercised option to acquire CapitolBank Common Stock pursuant to the
      CapitolBank Stock Option Plan on the Effective Date and who receives
      an option to acquire Westamerica Common Stock in exchange therefor will
      not recognize any gain or loss 

                                      -49-
<PAGE>
 
      at the time of the exchange. In addition, Westamerica and CapitolBank
      believe that any such unexercised option to acquire CapitolBank Common
      Stock which was an "incentive stock option" prior to the Merger should
      remain an "incentive stock option" after its conversion into an option to
      acquire Westamerica Common Stock.

           In general, if the CapitolBank Common Stock is held as a capital
      asset on the Effective Date, a dissenting shareholder will recognize a
      capital gain or loss measured by the difference between the amount of cash
      received and the basis of the CapitolBank Common Stock.  However, if such
      dissenting shareholder owns, directly or constructively through
      application of section 318 of the IRC, any shares of CapitolBank Common
      Stock as to which dissenters' rights are not exercised and perfected, or
      otherwise directly or constructively holds Westamerica Common Stock, such
      shareholder may be treated as having received a dividend in the amount of
      cash paid to the shareholder in exchange for the shares as to which
      dissenters' rights are perfected. The constructive ownership rules of
      section 318 of the IRC apply in certain specified circumstances to
      attribute ownership of stock of a corporation from the shareholder
      actually owning the stock, whether an individual, a trust, a partnership
      or a corporation, to certain members of the individual's family or to
      certain individuals, trusts, partnerships or corporations in which that
      shareholder has an ownership or beneficial interest, or which have an
      ownership or beneficial interest in that shareholder; a shareholder is
      also considered under these rules to own any stock with respect to which
      that shareholder holds exercisable options. Each shareholder who intends
      to dissent from the Merger should consult such shareholder's own tax
      advisor with respect to the application of the constructive ownership
      rules to the shareholder's particular circumstances.

           THE UNITED STATES FEDERAL INCOME TAX, CALIFORNIA PERSONAL INCOME TAX
      AND CALIFORNIA FRANCHISE TAX DISCUSSION SET FORTH ABOVE IS BASED UPON
      CURRENT LAW AND IS INTENDED FOR GENERAL INFORMATION ONLY.  EACH
      CAPITOLBANK SHAREHOLDER IS URGED TO CONSULT HIS OR HER OWN TAX ADVISOR
      CONCERNING THE SPECIFIC TAX CONSEQUENCES OF THE MERGER TO SUCH
      SHAREHOLDER, INCLUDING THE APPLICABILITY AND EFFECT OF STATE, LOCAL AND
      OTHER TAX LAWS.


      Amendment; Termination

           The Agreements may be amended by Westamerica and CapitolBank at any
      time prior to the Effective Date without the approval of the shareholders
      of Westamerica and the shareholders of CapitolBank with respect to any of
      their terms except the terms relating to the form or amount of
      consideration to be delivered to the CapitolBank shareholders in the
      Merger.  The Agreements may be terminated by the mutual consent of the
      Boards of Directors of both Westamerica and CapitolBank at any time prior
      to the consummation of the Merger.

           The Agreement may be terminated by Westamerica as follows:  (i) on or
      after July 31, 1995, if (A) any of the conditions to which the obligations
      of Westamerica are subject has not been fulfilled, or (B) such conditions
      have been fulfilled or waived by Westamerica and CapitolBank shall have
      failed to complete the Merger; (ii) if (A) Westamerica has become aware of
      any facts or circumstances of which it was not aware on the date of the
      Agreement and which materially adversely affect CapitolBank or its
      properties, operations or financial condition taken as a whole, (B) a
      materially adverse change shall have occurred since December 31, 1993, in
      the business, financial condition, results of operations or properties of
      CapitolBank, (C) there has been failure (including any anticipatory
      breach) on the part of CapitolBank to comply with its obligations under
      the Agreements, or any failure (including any anticipatory breach) to
      comply with any of the conditions to closing set forth in Section 7 of the
      Agreement, or (D) based on the continuing fiduciary duties of the
      CapitolBank Board of Directors to the shareholders of CapitolBank,
      CapitolBank fails to act or refrains from doing any act required of
      CapitolBank pursuant to the Agreement as a result of a bona fide offer for
      a Business Combination; (iii) if Westamerica determines that it would be
      inadvisable or inexpedient to continue to carry out the terms of, or to
      attempt to consummate the transactions contemplated in the Agreement, by
      reason of any significant legal impediment to the Merger having arisen, or
      any material pending or threatened litigation, investigation or
      proceeding; or (iv) if any person (other than Westamerica or any
      subsidiary thereof) shall become the beneficial owner of 20% or more of
      the then outstanding shares of CapitolBank or any person (other than
      Westamerica or a subsidiary thereof) shall have commenced a bona fide
      tender offer or exchange offer to acquire at least 20% of the then
      outstanding shares of CapitolBank. See "Certain Considerations -- Tyler v
      Wickland;" and  "-- Real Estate Lending Activities; Nonperforming Assets,"
      for a discussion on certain circumstances that currently exist which
      would cause the conditions to Westamerica's obligations to consummate the
      Merger not to be fulfilled and therefore give Westamerica the right to 
      terminate the Aggreement.

                                      -50-
<PAGE>
 
           The Agreements may be terminated by CapitolBank as follows:  (i) on
      or after July 31, 1995, if (A) any of the conditions to which the
      obligations of CapitolBank are subject has not been fulfilled, or (B) such
      conditions have been fulfilled or waived but Westamerica shall have failed
      to complete the Merger; provided, however, that if Westamerica is engaged
      at the time in litigation relating to an attempt to obtain one or more of
      the government approvals or if Westamerica shall be contesting in good
      faith any litigation which seeks to prevent consummation of the Merger,
      such nonfulfillment shall not give CapitolBank the right to terminate the
      Agreements until the earlier of (X) 12 months after the date of the
      Agreement or (Y) 60 days after the completion of such litigation and of
      any further regulatory or judicial action pursuant thereto; or (ii) if on
      or before the Effective Date (A) CapitolBank has become aware of any facts
      or circumstances of which it was not aware on November 17, 1994 and which
      can or do materially adversely affect Westamerica and its subsidiaries
      (taken as a whole) or its properties, operations, financial condition or
      prospects (taken as a whole), (B) a materially adverse change shall have
      occurred since December 31, 1993, in the business, financial condition,
      results of operations or assets of Westamerica and its subsidiaries (taken
      as a whole), (C) there has been failure (including any anticipatory
      breach) on the part of Westamerica to comply with its obligations under
      the Agreement or any failure (including any anticipatory breach) to comply
      with any condition set forth in Section 8 of the Agreement, or (D)
      Westamerica shall make any offer to any third party or accept any offer
      from any third party regarding a Business Combination of Westamerica with
      any other entity that is not conditioned upon performance by Westamerica
      or its successor of the obligations of Westamerica under the Agreement; or
      (iii) the Average Price of Westamerica Common Stock is less than $30.20 on
      the Effective Date.

           The right to terminate the Agreement may be exercised by Westamerica
      or CapitolBank, as the case may be, only by giving written notice, signed
      on behalf of such party by its Chairman of the Board or President, to the
      other party.

           If there has been a material breach by either party in the
      performance of any obligations under the Agreement, which shall not have
      been cured within 10 business days after written notice thereof has been
      given to the defaulting party, the nondefaulting party will have the right
      to terminate the Agreement upon written notice to the other party.  In any
      event, the nondefaulting party will have no obligation to consummate any
      transaction or take any further steps toward such consummation
      contemplated under the Agreement until such breach is cured.

           Termination of the Agreement does not terminate or affect the
      obligations of Westamerica or CapitolBank to pay expenses (see 
      "--Expenses"), to maintain the confidentiality of the other party pursuant
      to the Agreement, to make certain termination payments as described below,
      or to comply with the notice, attorneys' fees, governing law and third
      party beneficiary provisions of the Agreement and shall not affect any
      agreement after such termination.

           CapitolBank shall pay to Westamerica, on demand, the sum of $600,000
      if the Agreement is terminated by Westamerica for reasons relating to a
      Business Combination by CapitolBank or the acquisition by a third party of
      20% or more of CapitolBank Common Stock, or if any of the events specified
      in Section 12(b)(iv) of the Agreement occurs within 12 months following
      termination of the Agreement (relating to the acquisition by a third party
      of 20% or more of CapitolBank Common Stock) for any of the reasons stated
      in Section 12(b) of the Agreement (provided that such termination for a
      reason stated in Section 12(b) of the Agreement results from the
      interference of a third party or group who thereafter attempts to acquire
      CapitolBank).

           If the Agreement is terminated by CapitolBank for reasons relating to
      a Business Combination by Westamerica, Westamerica will pay to
      CapitolBank, on demand, the sum of $600,000.  In addition, Westamerica
      shall pay to CapitolBank the sum of $1,200,000 if the Agreement is
      terminated by Westamerica pursuant to Section 12(b)(ii) of the Agreement
      or by CapitolBank pursuant to Section 12(b)(vi) of the Agreement because
      of a failure to satisfy the conditions set forth in Sections 7(i) or 8(h)
      of the Agreement relating to Westamerica's obtaining necessary government
      approvals, subject to CapitolBank's compliance with Section 3.2(c) of the
      Agreement relating to CapitolBank's cooperation with Westamerica to obtain
      such approvals.  See "--Amendment; Termination."

                                      -51-
<PAGE>
 
      Expenses

           Westamerica and CapitolBank have each agreed to pay, without right of
      reimbursement from the other party and whether or not the transactions
      contemplated by the Agreements shall be consummated, their own costs
      incurred incident to the performance of its obligations under the
      Agreements, including without limitation, costs incident to the
      preparation of the Agreements, this Proxy Statement/Prospectus (including
      the audited financial statements of CapitolBank contained herein) and
      incident to the consummation of the Merger and of the other transactions
      contemplated in the Agreements, including the fees and disbursements of
      counsel, accountants, consultants and financial advisers employed by such
      party in connection therewith. Notwithstanding the foregoing, Westamerica
      shall be solely responsible for all fees payable pursuant to state
      securities laws, fees related to obtaining a revenue ruling or tax opinion
      and the fee required to be paid to the Commission to register the
      Westamerica Shares.

           CapitolBank shall bear its own costs of printing and distributing
      (including postage) this Proxy Statement/Prospectus and other information
      relating to these transactions to its shareholders.


      Accounting Treatment

           CapitolBank and Westamerica expect that the Merger will qualify for
      pooling of interests accounting treatment.  Under this method of
      accounting, Westamerica's prior period financial statements will be
      restated on a combined basis with those of CapitolBank, with all
      intercompany accounts being eliminated and all expenses relating to the
      Merger being deducted from combined income.

           It is a condition to Westamerica's obligation to consummate the
      Merger that, among other things, Westamerica receive a letter from KPMG
      Peat Marwick LLP ("KPMG"), its independent public accountants, to the
      effect that KPMG believes that the Merger will qualify for the pooling of
      interests method of accounting in accordance with generally accepted
      accounting principles and all applicable rules, regulations and policies
      of the Commission.  In addition, it also is a condition to such obligation
      of Westamerica that no determination will have been made by any court,
      tribunal, regulatory agency or other governmental entity that the Merger
      fails or will fail to qualify for pooling of interests accounting
      treatment and holders of no more than 9% of the shares of CapitolBank
      Common Stock immediately prior to the Effective Date have sought to
      perfect dissenters' rights under the GCL with respect to their shares.

           Representatives of KPMG are expected to be present at the Meeting and
      are expected to be available to respond to questions.


      Resales of Westamerica Common Stock

           The Westamerica Common Stock issued pursuant to the Merger will be
      freely transferable under the Securities Act, except for shares issued to
      any CapitolBank shareholder who may be deemed to be an "affiliate" of
      Westamerica or CapitolBank for purposes of Rule 145 under the Securities
      Act.  Each director of CapitolBank is deemed to be such an affiliate.  It
      is expected that each such director and each other person deemed to be an
      affiliate will enter into an agreement with Westamerica providing that
      such person will not transfer any Westamerica Common Stock received in the
      Merger, except in compliance with the Securities Act and applicable rules
      thereunder.  See "--Representations and Warranties; Conditions to the
      Merger."


                        DISSENTERS' RIGHTS OF APPRAISAL

           If the Agreement is approved by the required vote of CapitolBank
      shareholders and is not abandoned or terminated, shareholders of
      CapitolBank who vote against the Merger may be entitled to certain
      dissenters' appraisal rights under Chapter 13 of the GCL.

           The following discussion is not a complete statement of the GCL
      relating to dissenters' rights, and is qualified in its entirety by
      reference to sections 1300 through 1312 of the GCL attached to this Proxy
      Statement/Prospectus as Annex E and incorporated herein by reference.
      This discussion and sections 1300 through 

                                      -52-
<PAGE>
 
      1312 of the GCL should be reviewed carefully by any CapitolBank
      shareholder who wishes to exercise statutory dissenters' rights or wishes
      to preserve the right to do so, since failure to comply with the required
      procedures will result in the loss of such rights.

           If the Merger is consummated, those shareholders of CapitolBank who
      elect to exercise their dissenters' rights and who in a timely and proper
      fashion perfect such rights will be entitled to receive the "fair market
      value" of their shares in cash.  Pursuant to section 1300(a) of the GCL,
      such "fair market value" would be determined as of the day before the
      first announcement of the terms of the Merger, excluding any appreciation
      or depreciation in consequence of the proposed Merger, but adjusted for
      any stock split, reverse stock split, or share dividend which becomes
      effective thereafter.  CapitolBank believes that such "fair market value"
      is equal to the average of the bid and asked prices of CapitolBank Common
      Stock as reported on the Pink Sheets for November 17, 1994, or $1.88.

           Shares of CapitolBank Common Stock must satisfy each of the following
      requirements to qualify as dissenting shares ("Dissenting Shares") under
      the GCL:  (i) the shares of CapitolBank Common Stock must have been
      outstanding on the Record Date (and, therefore, shares acquired after such
      Record Date upon exercise of options to purchase CapitolBank Common Stock
      may not constitute Dissenting Shares); (ii) the shares of CapitolBank
      Common Stock must not have been voted "FOR" approval and adoption of the
      Agreements, the Merger and the transactions contemplated thereby; and
      (iii) the holder of such shares of CapitolBank Common Stock must submit
      certificates for endorsement as described below.  If a holder of
      CapitolBank Common Stock votes "FOR" the approval and adoption of the
      Agreements, the Merger and the transactions contemplated thereby
      (including by executing and returning a proxy to CapitolBank with no
      voting instructions indicated thereon) such holder will lose any
      dissenters' rights that may exist with respect to the subject shares.

           If the Merger is approved at the Meeting, CapitolBank will, within 10
      days after such approval, mail to any shareholder who may have a right to
      require CapitolBank to purchase his or her shares for cash as a result of
      making such a demand, a notice that the required shareholder approval and
      adoption of the Agreements, the Merger and the transactions contemplated
      thereby was obtained (the "Notice of Approval") accompanied by a copy of
      sections 1300 through 1304 of the GCL.  The Notice of Approval will set
      forth the price determined by CapitolBank to represent the "fair market
      value" of any Dissenting Shares (which shall constitute an offer by
      CapitolBank to purchase such Dissenting Shares at such stated price), and
      will set forth a brief description of the procedures to be followed by
      such shareholders who wish to exercise their dissenters' rights.

           Within 30 days after the date on which the Notice of Approval was
      mailed:  (i) CapitolBank or its transfer agent must receive the demand of
      the dissenting shareholder which is required by law to contain a statement
      concerning the number and class of shares of CapitolBank Common Stock held
      of record by such dissenting shareholder which the dissenting shareholder
      demands that CapitolBank purchase, and a statement of what such dissenting
      shareholder claims to be the fair market value of the Dissenting Shares as
      of November 17, 1994, the day before the announcement of the proposed
      Merger (the statement of fair market value in such demand by the
      dissenting shareholder constitutes an offer by the dissenting shareholder
      to sell the Dissenting Shares at such price); and (ii) the dissenting
      shareholder must submit share certificate(s) representing the Dissenting
      Shares to CapitolBank at CapitolBank's principal office or at the office
      of its transfer agent.  The certificate(s) will be stamped or endorsed
      with a statement that the shares are Dissenting Shares or will be
      exchanged for certificates of appropriate denomination so stamped or
      endorsed.  If the price contained in the Notice of Approval is acceptable
      to the dissenting shareholder, the dissenting shareholder may demand the
      same price.  This would constitute an acceptance of the offer by
      CapitolBank to purchase the dissenting shareholder's stock at the price
      stated in the Notice of Approval.

           If CapitolBank and a dissenting shareholder agree upon the price to
      be paid for the Dissenting Shares, upon the dissenting shareholder's
      surrender of the certificates representing the Dissenting Shares, such
      price (together with interest thereon at the legal rate on judgments from
      the date of the agreement between CapitolBank and the dissenting
      shareholder) is required by law to be paid to the dissenting shareholder
      within 30 days after such agreement or within 30 days after any statutory
      or contractual conditions to the Merger are satisfied, whichever is later,
      subject to the surrender of the certificates therefor.

                                      -53-
<PAGE>
 
           If CapitolBank and a dissenting shareholder disagree as to the price
      for such Dissenting Shares or disagree as to whether such Dissenting
      Shares are entitled to be classified as Dissenting Shares, such holder
      may, within six months after the Notice of Approval is mailed, file a
      complaint in the Superior Court of the proper county requesting the court
      to make such determinations or, alternatively, may intervene in any
      pending action brought by any other dissenting shareholder.  Costs of such
      an action (including compensation of appraisers) are required to be
      assessed as the court considers equitable, but must be assessed against
      CapitolBank if the appraised value as determined by the court exceeds the
      price offered by CapitolBank.

           The court action to determine the fair market value of the shares
      will be suspended if litigation is instituted to test the sufficiency or
      regularity of the votes of the shareholders in authorizing the Merger.
      Furthermore, no shareholder who has appraisal rights under Chapter 13 of
      the GCL has any right to attack the validity of the Merger or to have the
      Merger set aside or rescinded except in an action to test whether the
      number of shares required to authorize or approve the Merger has been
      legally voted in favor of the Merger.

           Dissenting Shares may lose their status as such and the right to
      demand payment will terminate if (i) the Merger is abandoned (in which
      case CapitolBank shall pay on demand to any dissenting shareholder who has
      initiated proceedings in good faith as provided under Chapter 13 of the
      GCL all necessary expenses and reasonable attorneys' fees incurred in such
      proceedings); (ii) the Dissenting Shares are transferred before being
      submitted for endorsement or are surrendered for conversion into shares of
      another class; (iii) the dissenting shareholder and CapitolBank do not
      agree upon the status of the shares as Dissenting Shares or upon the price
      of such shares and the dissenting shareholder fails to file suit against
      CapitolBank or intervene in a pending action within six months following
      the date on which the Notice of Approval was mailed to the shareholder; or
      (iv) the dissenting shareholder withdraws his or her demand for the
      purchase of the Dissenting Shares with the consent of CapitolBank.


                    PRO FORMA COMBINED FINANCIAL INFORMATION

           The following Unaudited Pro Forma Combined Financial Statements give
      effect to the Merger on a pooling of interests basis.  Additionally, the
      Unaudited Pro Forma Combined Financial Statements give effect to
      Westamerica's pending acquisitions of PV Financial and North Bay on a
      pooling of interests basis.  See "Information About Westamerica--Pending
      Acquisitions."  The Unaudited Pro Forma Combined Statements of Income
      assume the Merger and Westamerica's pending acquisitions were effective as
      of the beginning of each of the nine months ended September 30, 1994 and
      1993 and each of the years ended December 31, 1993, 1992 and 1991.  The
      Unaudited Pro Forma Combined Balance Sheet assumes the Merger and
      Westamerica's pending acquisitions were effective September 30, 1994.  For
      a description of the pooling of interests accounting with respect to the
      Merger, see "The Merger--Accounting Treatment."  This pro forma financial
      data and the accompanying notes should be read in conjunction with and are
      qualified in their entirety by the historical consolidated financial
      statements of Westamerica, PV Financial, CapitolBank and North Bay,
      including the respective notes thereto, and the unaudited condensed
      consolidated historical and other pro forma financial information,
      including the notes thereto, appearing elsewhere in this Proxy
      Statement/Prospectus or incorporated herein by reference.

           As described in the Notes to Unaudited Pro Forma Combined Financial
      Statements, the effect of expenses incurred or expected to be incurred by
      Westamerica, PV Financial, CapitolBank and North Bay in connection with
      the Merger and pending acquisitions has been reflected in the Unaudited
      Pro Forma Combined Balance Sheet; however, since such expenses are
      nonrecurring, they have not been reflected in the Unaudited Pro Forma
      Consolidated Statements of Income.  The pro forma financial data do not
      give effect to any cost savings which might result from the Merger and
      pending acquisitions.

           The pro forma financial data are presented for illustrative purposes
      only and are not necessarily indicative of the future operating results or
      future financial position that would have occurred had the Merger and
      pending acquisitions been consummated as of the date or the beginning of
      the periods indicated or that may be obtained in the future.

                                      -54-
<PAGE>
 
           Summary Unaudited Pro Forma Combined Statements of Income
                     (In thousands, except per share data)

<TABLE>
<CAPTION>
                                                Nine Months
                                                   Ended
                                                September 30,                    Year Ended December 31,
                                           ------------------------  ---------------------------------------------
                                             1994(1)      1993(1)        1993(1)          1992(1)        1991(1)
                                           -----------  -----------  ----------------  --------------  -----------
<S>                                        <C>          <C>          <C>               <C>              <C>
      Interest Income
        Interest and fees on loans.......   $   88,619    $   93,171    $ 123,028        $  139,453     $  167,071
        Interest and dividends on                                                      
         investment securities...........       33,384        30,126       40,623            41,676         41,214
        Trading account interest.........            1             6            6                 4             54
        Other interest income............          778           957        1,286             2,967          3,832
                                            ----------    ----------    ---------        ----------     ----------
         Total interest income...........      122,782       124,260      164,943           184,100        212,171
                                                                                       
      Interest Expense                                                                 
        Interest on deposits.............       30,933        36,584       47,115            66,749         98,625
        Interest on funds purchased and                                                
         other short-term borrowings.....        3,670         1,248        2,026               840          1,997
        Interest on long-term debt.......        2,061         1,496        2,016             2,362          2,611
                                            ----------    ----------    ---------        ----------     ----------
         Total interest expense..........       36,664        39,328       51,157            69,951        103,233
                                            ----------    ----------    ---------        ----------     ----------
                                                                                       
      Net Interest Income................       86,118        84,932      113,786           114,149        108,938
      Loan loss provision................        5,224         8,717       10,581             8,410         12,201
                                            ----------    ----------    ---------        ----------     ----------
      Net Interest Income After Loan                                                   
        Loss Provision...................       80,889        76,215      103,205           105,739         96,737
                                                                                       
      Noninterest Income                                                               
        Service charges on deposit.......        9,775        10,458       13,939            13,562         13,094
        Net investment securities gains..          500           351          351             1,385          2,083
        Other............................       10,055        15,424       20,573            16,763         14,106
                                            ----------    ----------    ---------        ----------     ----------
         Total noninterest income........       20,330        26,233       34,863            31,710         29,283
                                                                                       
      Noninterest Expense                                                              
        Salaries and related benefits....       34,353        37,689       49,322            50,358         48,913
        Premises and equipment...........       12,015        14,863       19,397            17,731         17,388
        FDIC insurance and other                                                       
         assessments.....................        3,215         3,341        4,415             4,285          3,791
        Other............................       21,274        39,241       48,352            39,391         33,424
                                            ----------    ----------    ---------        ----------     ----------
         Total noninterest expense.......       70,857        95,134      121,466           111,765        103,516
                                            ----------    ----------    ---------        ----------     ----------
                                                                                       
      Income Before                                                                    
        Income Taxes.....................       30,362         7,314       16,602            25,684         22,504
        Provision for income taxes.......        9,795         1,702        4,578             9,661          7,872
                                            ----------    ----------    ---------        ----------     ----------
      Net Income Before                                                                
        Extraordinary Item...............       20,567         5,612       12,024            16,023         14,632
         Extraordinary items tax                                                       
         benefit on net operating loss                                                 
         carryforward....................            0             0            0                17            130
                                            ----------    ----------    ---------        ----------     ----------
      Net Income.........................   $   20,567    $    5,612    $  12,024        $   16,040     $   14,762
                                            ==========    ==========    =========        ==========     ==========
      Average shares outstanding(2)......       10,034         9,997       10,048             9,877          9,776
      Net income from continuing                                                       
        operations per share(2)..........   $     2.05    $     0.56    $    1.20        $     1.62     $     1.51
</TABLE>
         See Notes to Unaudited Pro Forma Combined Financial Statements

                                      -55-
<PAGE>
 
                Unaudited Pro Forma Combined Statements of Income
                     (In thousands, except per share data)
<TABLE>
<CAPTION>
                                                         Nine Months Ended September 30, 1994
                               -------------------------------------------------------------------------------------------------
                                                                                                                     Westamerica 
                                                               Westamerica               Westamerica,               PV Financial,
                                                                 and PV                  PV Financial                CapitolBank 
                                                                Financial               and CapitolBank             and North Bay
                                                  PV            Pro Forma                  Pro Forma                  Pro Forma  
                               Westamerica    Financial(1)     Combined(1)   CapitolBank   Combined(1)  North Bay(1)  Combined(1)
                               -----------    ------------    ------------   -----------   --------     ---------     --------    
<S>                           <C>            <C>              <C>           <C>           <C>          <C>           <C>      
Interest Income                                                                                                               
 Interest and fees on loans..  $    69,189   $     9,500      $    78,689     $   6,032    $  84,721   $   3,898      $ 88,619
 Interest and dividends on                                                                                                    
  investment securities......       30,676           478           31,154         1,275       32,429         955        33,384
 Trading account interest....            1             0                1             0            1           0             1
 Other interest income.......            0           291              291           193          484         294           778
                               -----------   -----------      -----------     ---------    ---------   ---------      -------- 
  Total interest income......       99,866        10,269          110,135         7,500      117,635       5,147       122,782
                                                                                                                              
Interest Expense                                                                                                              
 Interest on deposits........       24,659         2,744           27,403         1,827       29,230       1,703        30,933
 Interest on funds purchased                                                                                                  
  and other short-term                                                                                                        
  borrowings.................        3,568             0            3,568            41        3,609          61         3,670
 Interest on long-term debt..        2,061             0            2,061             0        2,061           0         2,061
                               -----------   -----------      -----------     ---------    ---------   ---------      -------- 
  Total interest expense.....       30,288         2,744           33,032         1,868       34,900       1,764        36,664
                               -----------   -----------      -----------     ---------    ---------   ---------      -------- 
                                                                                                                              
Net Interest Income..........       69,578         7,525           77,103         5,632       82,735       3,383        86,118
 Loan loss provision.........        4,680           184            4,864           285        5,149          80         5,229 
                               -----------   -----------      -----------     ---------    ---------   ---------      -------- 
Net Interest Income After                                                                                                     
 Loan                                                                                                                         
 Loss Provision..............       64,898         7,341           72,239         5,347       77,586       3,303        80,889
                                                                                                                              
Noninterest Income                                                                                                            
 Service charges on deposit..        8,909           498            9,407            74        9,481         294         9,775
 Net investment securities                                                                                                    
  gains (losses).............          539           (99)             440            82          522         (22)          500
 Other.......................        5,304           642            5,946           622        6,568       3,487        10,055
                               -----------   -----------      -----------     ---------    ---------   ---------      -------- 
  Total noninterest income...       14,752         1,041           15,793           778       16,571       3,759        20,330
                                                                                                                              
Noninterest Expense                                                                                                           
 Salaries and related                                                                                                         
  benefits...................       26,077         2,598           28,675         2,998       31,673       2,680        34,353
 Premises and equipment......        8,940           894            9,834         1,135       10,969       1,046        12,015
 FDIC insurance and other                                                                                                     
  assessments................        2,963           252            3,215                      3,215                     3,215
 Other.......................       15,130         1,603           16,733         1,656       18,389       2,885        21,274
                               -----------   -----------      -----------     ---------    ---------   ---------      -------- 
  Total noninterest expense..       53,110         5,347           58,457         5,789       64,246       6,611        70,857
                               -----------   -----------      -----------     ---------    ---------   ---------      -------- 
                                                                                                                              
Income Before Income Taxes...       26,540         3,035           29,575           336       29,911         451        30,362
  Provision for income taxes.        8,237         1,334            9,571            55        9,626         169         9,795 
                               -----------   -----------      -----------     ---------    ---------   ---------      -------- 
Net Income Before                                                                                                             
 Extraordinary Item..........       18,303         1,701           20,004           281       20,285         282        20,567
 Extraordinary item                                                                                                           
  Tax benefit on net operating                                                                                                
   loss carryforward.........            0             0                0             0            0           0             0
                               -----------   -----------      -----------     ---------    ---------   ---------      -------- 
Net Income...................  $    18,303   $     1,701      $    20,004     $     281    $  20,285   $     282      $ 20,567
                               ===========   ===========      ===========     =========    =========   =========      ======== 
Average shares outstanding(2).       8,075         2,175            9,260         4,080        9,643       1,087        10,034
Net income from continuing                                                                                                    
  operations per share(2)..... $      2.27   $      0.78      $      2.16     $    0.07    $    2.10   $    0.26      $   2.05 
</TABLE>

         See Notes to Unaudited Pro Forma Combined Financial Statements

                                      -56-
<PAGE>
 
         Unaudited Pro Forma Combined Consolidated Statements of Income
                     (In thousands, except per share data)
<TABLE>
<CAPTION>
                                                                     Nine Months Ended September 30, 1993
                                         ------------------------------------------------------------------------------------------
                                                                                                                       Westamerica
                                                                    Westamerica              Westamerica,             PV Financial,
                                                                      and PV                 PV Financial              CapitolBank
                                                                     Financial              and CapitolBank           and North Bay
                                                          PV         Pro Forma                 Pro Forma                Pro Forma  
                                        Westamerica   Financial(1)   Combined(1)  CapitolBank  Combined(1) North Bay(1) Combined(1)
                                       ------------- -------------  ------------  -----------  ----------- ------------ -----------
<S>                                     <C>            <C>           <C>           <C>          <C>        <C>          <C> 
 Interest Income                                                                                                                
  Interest and fees on loans...........   $ 75,902      $8,321        $ 84,223       $4,866     $ 89,089     $ 4,082    $ 93,171
  Interest and dividends on                                                                                                     
   investment securities...............     27,246         444          27,690        1,632       29,322         804      30,126
  Trading account interest.............          6           0               6            0            6           0           6
  Other interest income................        299         311             610          124          734         223         957
                                          --------      ------        --------       ------     --------     -------    --------
   Total interest income...............    103,453       9,076         112,529        6,622      119,151       5,109     124,260
                                                                                                                                
 Interest Expense                                                                                                               
  Interest on deposits.................     29,911       2,828          32,739        2,005       34,744       1,840      36,584
  Interest on funds purchased and                                                                                               
   other short-term borrowings.........      1,179           0           1,179           32        1,211          37       1,248
  Interest on long-term debt...........      1,496           0           1,496            0        1,496           0       1,496
                                          --------      ------        --------       ------     --------     -------    --------
   Total interest expense..............     32,586       2,828          35,414        2,037       37,451       1,877      39,328
                                          --------      ------        --------       ------     --------     -------    --------
                                                                                                                                
 Net Interest Income...................     70,867       6,248          77,115        4,585       81,700       3,232      84,932
  Loan loss provision..................      7,847         384           8,231          336        8,567         150       8,717 
                                          --------      ------        --------       ------     --------     -------    --------
 Net Interest Income After Loan                                                                                                 
  Loss Provision.......................     63,020       5,864          68,884        4,249       73,133       3,082      76,215
                                                                                                                                
 Noninterest Income                                                                                                             
  Service charges on deposit accounts..      9,627         417          10,044           97       10,141         317      10,458
  Net investment securities gains......         68           0              68          283          351           0         351
  Other................................      9,242         600           9,842          595       10,437       4,987      15,424
                                          --------      ------        --------       ------     --------     -------    -------- 
   Total noninterest income............     18,937       1,017          19,954          975       20,929       5,304      26,233
                                                                                                                                
 Noninterest Expense                                                                                                            
  Salaries and related benefits........     30,118       2,298          32,416        2,560       34,976       2,713      37,689
  Premises and equipment...............     11,673         817          12,490        1,053       13,543       1,320      14,863
  FDIC insurance and other                                                                                                      
   assessments.........................      3,089         252           3,341                     3,341                   3,341
  Other................................     32,273       1,337          33,610        1,421       35,031       4,210      39,241
                                          --------      ------        --------       ------     --------     -------    --------
   Total noninterest expense...........     77,153       4,704          81,857        5,034       86,891       8,243      95,134
                                          --------      ------        --------       ------     --------     -------    --------
                                                                                                                                
 Income Before Income Taxes............      4,804       2,177           6,981          190        7,171         143       7,314
 Income tax provision..................        730         903           1,633           26        1,659          43       1,702 
                                          --------      ------        --------       ------     --------     -------    --------
 Net Income Before                                                                                                              
  Extraordinary Item...................      4,074       1,274           5,348          164        5,512         100       5,612 
  Extraordinary item...................                                                                                         
   Tax benefit on net operating                                                                                                 
    loss carryforward..................          0           0               0            0            0           0           0
                                          --------      ------        --------       ------     --------     -------    --------
 Net Income............................   $  4,074      $1,274        $  5,348       $  164     $  5,512     $   100    $  5,612
                                          ========      ======        ========       ======     ========     =======    ========
 Average shares outstanding(2).........      8,051       2,150           9,222        4,080        9,605       1,089       9,997
 Net income from continuing                                                                                                     
  operations per share(2)..............   $   0.51      $ 0.59        $   0.58       $ 0.04     $   0.57     $  0.09    $   0.56 
</TABLE>
         See Notes to Unaudited Pro Forma Combined Financial Statements

                                      -57-
<PAGE>
 
         Unaudited Pro Forma Combined Consolidated Statements of Income
                     (In thousands, except per share data)
<TABLE>
<CAPTION>
                                                                 Year Ended December 31, 1993
                                  ------------------------------------------------------------------------------------------------
                                                                                                                       Westamerica
                                                                                                                      PV Financial,
                                                                  Westamerica               Westamerica,               CapitolBank
                                                                    and PV                  PV Financial                   and 
                                                                   Financial               and CapitolBank              North Bay
                                                        PV         Pro Forma                  Pro Forma                 Pro Forma
                                    Westamerica     Financial(1)   Combined(1)  CapitolBank  Combined(1)  North Bay(1)  Combined(1)
                                   -------------   -------------  ------------  -----------  -----------  ------------ ----------
<S>                                <C>              <C>           <C>           <C>          <C>          <C>           <C> 
 Interest Income                                                                                                       
  Interest and fees on loans.....    $ 99,607        $11,285        $110,892     $6,680      $117,572        $ 5,456    $123,028
  Interest and dividends on                                                                                            
   investment securities.........      37,005            584          37,589      1,988        39,577          1,046      40,623
  Trading account interest.......           6              0               6          0             6              0           6
  Other interest income..........         298            419             717        283         1,000            286       1,286
                                     --------        -------        --------     ------      --------        -------    --------
   Total interest income.........     136,916         12,288         149,204      8,951       158,155          6,788     169,943
                                                                                                                       
 Interest Expense                                                                                                      
  Interest on deposits...........      38,318          3,729          42,047      2,631        44,678          2,437      47,115
  Interest on funds purchased and                                                                                      
   other short-term borrowings...       1,937              0           1,937         40         1,977             49       2,026
  Interest on long-term debt.....       2,016              0           2,016          0         2,016              0       2,016
                                     --------        -------        --------     ------      --------        -------    --------
   Total interest expense........      42,271          3,729          46,000      2,671        48,671          2,486      51,157
                                     --------        -------        --------     ------      --------        -------    --------
                                                                                                                       
 Net Interest Income.............      94,645          8,559         103,204      6,280       109,484          4,302     113,786
  Loan loss provision............       9,452            543           9,995        436        10,431            150      10,581
                                     --------        -------        --------     ------      --------        -------    --------
 Net Interest Income After Loan                                                                                        
  Loss Provision.................      85,193          8,016          93,209      5,844        99,053          4,152     103,205
                                                                                                                       
 Noninterest Income                                                                                                    
  Service charges on deposit                                                                                           
   accounts......................      12,809            574          13,383        129        13,512            427      19,939
  Net investment securities gains          68              0              68        283           351              0         351
  Other..........................      11,069          1,095          12,164        802        12,966          7,607      20,573
                                     --------        -------        --------     ------      --------        -------    --------
   Total noninterest income......      23,946          1,669          25,615      1,214        26,829          8,034      34,863
                                                                                                                       
 Noninterest Expense                                                                                                   
  Salaries and related benefits..      39,007          3,175          42,182      3,379        45,561          3,761      49,322
  Premises and equipment.........      14,820          1,090          15,910      1,799        17,709          1,668      19,377
  FDIC insurance and other                                                                                             
   assessments...................       4,079            336           4,415          0         4,415                      4,415
  Other..........................      38,739          1,846          40,585      1,485        42,070          6,282      48,352
                                     --------        -------        --------     ------      --------        -------    --------
   Total noninterest expense.....      96,645          6,447         103,092      6,663       109,755         11,711     121,466
                                     --------        -------        --------     ------      --------        -------    --------
                                                                                                                       
 Income Before Income Taxes......      12,494          3,238          15,732        394        16,126            475      16,602
  Provision for income taxes.....       3,039          1,280           4,319         79         4,398            180       4,578 
                                     --------        -------        --------     ------      --------        -------    --------
 Net Income Before Extraordinary                                                                                       
  Item...........................       9,455         18,190          11,413        315        11,728            295      12,024
  Extraordinary item.............           0              0               0          0             0              0           0
                                     --------        -------        --------     ------      --------        -------    --------
 Net Income......................    $  9,455        $ 1,958        $ 11,413     $  315      $ 11,728        $   295    $ 12,024
                                     ========        =======        ========     ======      ========        =======    ========
 Average shares outstanding(2)...       8,054          2,237           9,273      4,080         9,656          1,089      10,048
 Net income from continuing                                                                                            
  operations per share(2)........    $   1.17        $  0.88        $   1.23     $ 0.08      $   1.21        $  0.27    $   1.20
</TABLE>
         See Notes to Unaudited Pro Forma Combined Financial Statements

                                      -58-
<PAGE>
 
         Unaudited Pro Forma Combined Consolidated Statements of Income
                     (In thousands, except per share data)
<TABLE>
<CAPTION>
                                                                     Year Ended December 31, 1992
                                  ------------------------------------------------------------------------------------------------
                                                                                                                       Westamerica
                                                                  Westamerica              Westamerica,               PV Financial,
                                                                    and PV                 PV Financial                CapitolBank
                                                                   Financial              and CapitolBank             and North Bay
                                                        PV         Pro Forma                 Pro Forma                  Pro Forma
                                    Westamerica     Financial(1)   Combined(1)  CapitolBank  Combined(1) North Bay(1)  Combined(1)
                                   -------------   -------------  ------------  -----------  ----------- ------------  -----------
<S>                                <C>              <C>           <C>           <C>          <C>         <C>           <C>
 Interest Income
  Interest and fees on loans.....   $115,357       $10,565         $125,922      $ 6,334    $132,256     $   7,197       $139,453
  Interest and dividends on
   investment securities.........     37,647           877           38,524        2,268      40,792           884         41,676
  Trading account interest.......          4             0                4            0           4             0              4
  Other interest income..........      1,745           366            2,111          523       2,634           333          2,967
                                    --------       -------         --------      -------    --------      --------       --------
   Total interest income.........    154,753        11,808          166,561        9,125     175,686         8,414        184,100

 Interest Expense
  Interest on deposits...........     55,832         4,560           60,392        3,240      63,632         3,117         66,749
  Interest on funds purchased and
   other short-term borrowings...        698            31              729           41         770            70            840
  Interest on long-term debt.....      2,362             0            2,362            0       2,362             0          2,362
                                    --------       -------         --------      -------    --------      --------       --------
   Total interest expense........     58,892         4,591           63,483        3,281      66,764         3,187         69,951
                                    --------       -------         --------      -------    --------      --------       --------

 Net Interest Income.............     95,861         7,217          103,078        5,844     108,922         5,227        114,149
  Loan loss provision............      7,005           490            7,495          520       8,015           345          8,410
                                    --------       -------         --------      -------    --------      --------       --------
 Net Interest Income After Loan
  Loss Provision.................     88,856         6,727           95,583        5,324     100,907         4,832        105,739

 Noninterest Income
  Service charges on deposit
   accounts......................     12,437           517           12,954          223      13,177           385         13,562
  Net investment securities gains      1,066            50            1,116          269       1,385             0          1,385
  Other..........................     10,324         1,029           11,353          798      12,151         4,612         16,763
                                    --------       -------         --------      -------    --------      --------       --------
   Total noninterest income......     23,827         1,596           25,423        1,290      26,713         4,997         31,710

 Noninterest Expense
  Salaries and related benefits..     40,826         2,853           43,679        3,360      47,039         3,319         50,358
  Premises and equipment.........     13,826         1,033           14,859        1,856      16,715         1,016         17,731
  FDIC insurance and other
   assessments...................      4,021           264            4,285                    4,285                        4,285
  Other..........................     30,931         1,428           32,359        3,262      35,621         3,770         39,391
                                    --------       -------         --------      -------    --------      --------       --------
   Total noninterest expense.....     89,604         5,578           95,182        8,478     103,660         8,105        111,765
                                    --------       -------         --------      -------    --------      --------       --------

 Income (Loss) Before Income
  Taxes..........................     23,079         2,745           25,824       (1,864)     23,960         1,724         25,684
  Provision for income taxes.....      7,874         1,110            8,984            0       8,984           677          9,661
                                    --------       -------         --------      -------    --------      --------       --------
 Net Income (Loss) Before
  Extraordinary Item.............     15,205         1,635           16,840       (1,864)     14,976         1,047         16,023
  Extraordinary item.............         17             0               17            0          17             0             17
                                    --------       -------         --------      -------    --------      --------       --------
 Net Income (Loss)...............   $ 15,222       $ 1,635         $ 16,857      $(1,864)   $ 14,993      $  1,047       $ 16,040
                                    ========       =======         ========      =======    ========      ========       ========
 Average shares outstanding(2)...      7,933         2,147            9,103        4,080       9,486         1,086          9,877
 Net income (loss) from
  continuing operations per
  share(2).......................      $1.92         $0.76            $1.85       $(0.46)      $1.58      $   0.96       $  1.62
</TABLE>

        See Notes to Unaudited Pro Forma Combined Financial Statements

                                      -59-
<PAGE>
 
         Unaudited Pro Forma Combined Consolidated Statements of Income
                     (In thousands, except per share data)
<TABLE>
<CAPTION>
 
                                                              Year Ended December 31, 1991                                         
                                  -------------------------------------------------------------------------------------------------
                                                                                                                       Westamerica
                                                                  Westamerica               Westamerica,              PV Financial,
                                                                    and PV                 PV Financial                CapitolBank
                                                                   Financial              and CapitolBank             and North Bay
                                                        PV         Pro Forma                 Pro Forma                  Pro Forma
                                    Westamerica     Financial(1)  Combined(1)   CapitolBank  Combined(1) North Bay(1)  Combined(1)
                                   -------------    ------------  -----------   -----------  ----------- ------------  -----------
<S>                                <C>              <C>           <C>           <C>          <C>         <C>           <C>       
Interest Income                                                                                                                  
  Interest and fees on loans......   $137,656       $11,966        $149,622      $ 8,881    $158,503     $  8,568       $167,071 
  Interest and dividends on                                                                                                      
   investment securities..........     36,651         1,384          38,035        2,739      40,774          440         41,214
  Trading account interest........         54             0              54            0          54            0             54 
  Other interest income...........      2,191           199           2,390          868       3,258          574          3,832 
                                     --------       -------        --------      -------    --------     --------       -------- 
   Total interest income..........    176,552        13,549         190,101       12,488     202,589        9,582        212,171 
                                                                                                                                 
Interest Expense                                                                                                                 
  Interest on deposits............     83,069         5,744          88,813        5,250      94,063        4,562         98,625 
  Interest on funds purchased and                                                                                                
   other short-term borrowings....      1,677           149           1,826           87       1,913           84          1,997 
  Interest on long-term debt......      2,611             0           2,611            0       2,611            0          2,611 
                                     --------       -------        --------      -------    --------     --------       -------- 
   Total interest expense.........     87,357         5,893          93,250        5,337      98,587        4,646        103,233  
                                     --------       -------        --------      -------    --------     --------       -------- 
Net Interest Income...............     89,195         7,656          96,851        7,151     104,002        4,936        108,938  
  Loan loss provision.............     10,418            93          10,511        1,067      11,578          623         12,201 
                                     --------       -------        --------      -------    --------     --------       -------- 
Net Interest Income After                                                                                                        
  Loan Loss Provision.............    606,595        46,447          86,340        6,084      92,424        4,313         96,737 
                                                                                                                                 
Noninterest Income                                                                                                               
  Service charges on deposit                                                                                                     
   accounts.......................     12,056           467          12,523          227      12,750          344         13,094 
  Net investment securities                                                                                                      
   gains (losses).................      1,742          (108)          1,634          449       2,083            0          2,083 
  Other...........................     10,178           448          10,626          995      11,621        2,485         14,106
                                     --------       -------        --------      -------    --------     --------       -------- 
   Total noninterest income.......     23,976           807          24,783        1,671      26,454        2,829         29,283 
                                                                                                                                 
Noninterest Expense                                                                                                              
  Salaries and related benefits...     40,252         3,007          43,259        3,186      46,445        2,468         48,913 
  Premises and equipment..........     13,923           893          14,816        1,764      16,580          808         17,388 
  FDIC insurance and other                                                                                                       
   assessments....................      3,545           246           3,791                    3,791                       3,791 
  Other...........................     27,223         1,479          28,702        2,523      31,225        2,199         33,424 
                                     --------       -------        --------      -------    --------     --------       -------- 
   Total noninterest expense......     84,943         5,625          90,568        7,473      98,041        5,475        103,516 
                                     --------       -------        --------      -------    --------     --------       -------- 
Income Before Income Taxes........     17,810         2,745          20,555          282      20,837        1,667         22,504
  Provision for income taxes......      5,919         1,127           7,046          115       7,161          711          7,872  
                                     --------       -------        --------      -------    --------     --------       -------- 
Net Income Before Extraordinary        
  Item............................     11,891        12,868          13,509          167      13,676          956         14,632  
  Extraordinary item..............         86             0              86           44         130            0            130 
                                     --------       -------        --------      -------    --------     --------       -------- 
Net Income........................   $ 11,977       $ 1,618        $ 13,595      $   211    $ 13,806     $    956       $ 14,762  
                                     ========       =======        ========      =======    ========     ========       ======== 
Average shares outstanding(2).....      7,855         2,103           9,001        4,080       9,384        1,089          9,776 
Net income from continuing                                                                                                       
  operations per share(2).........      $1.52         $0.77           $1.51        $0.05    $   1.47     $   0.88       $   1.51 
</TABLE>

           See Notes to Unaudited Pro Forma Combined Financial Statements

                                      -60-
<PAGE>
 
                   Unaudited Pro Forma Combined Balance Sheet
                                 (In thousands)
<TABLE>
<CAPTION>
 
                                                                                 At September 30, 1994
                                         ------------------------------------------------------------------------------------------
                                                                                                  
                                                                                                              
                                                                                        Westamerica              
                                                                                          and PV                 
                                                                                         Financial               
                                                               PV         Pro Forma      Pro Forma                   Pro Forma
                                           Westamerica     Financial(1) Adjustments(3)   Combined(1)  CapitolBank  Adjustments(4)
                                          -------------   ------------- --------------  ------------  -----------  --------------
<S>                                       <C>              <C>          <C>             <C>           <C>          <C> 
                                                                                                                 
Assets                                                                                                           
 Cash and cash equivalents........       $  115,532         $ 14,629                     $  130,161     $ 29,995 
 Interest bearing deposits in                                                                                    
  other banks.....................              250                0                            250            0 
 Trading account securities.......                0                0                              0            0 
 Investment securities available-                                                                                
  for-sale........................          169,807           14,182                        183,989       17,606 
 Investment securities held-to-                                                                                  
  maturity........................          618,523            6,996                        625,519            0 
 Loans, net of reserve for                                                                                       
  loan losses.....................        1,063,123          132,904                      1,196,027       87,511 
 Other real estate owned and                                                                                     
  loan collateral substantively                                                                                  
   foreclosed.....................           12,830              154                         12,984            0 
 Premises and equipment, net......           23,834            1,000                         24,834        1,294 
 Interest receivable and                                                                                         
  other assets....................           48,185            3,124                         51,309        1,563 
                                         ----------         --------     ----------      ----------     --------    ----------
   Total Assets...................       $2,052,084         $172,989     $        0      $2,225,073     $137,969    $        0
                                         ==========         ========     ==========      ==========     ========    ==========
                                                                                                                 
Liabilities                                                                                                      
 Deposits:                                                                                                       
  Noninterest bearing.............       $  374,705         $ 32,087                     $  406,792     $ 32,868 
  Interest bearing................        1,340,272          120,342                      1,460,614       93,158 
                                         ----------         --------                     ----------     -------- 
   Total deposits.................        1,714,977          152,429                      1,867,406      126,026 
 Funds purchased and other short-                                                                                
  term borrowings.................          133,654                0                        133,654        1,719 
 Other liabilities................           40,430            1,724            730          42,884          952           535
                                         ----------         --------     ----------      ----------     --------    ----------
  Total Liabilities...............        1,889,061          154,153            730       2,043,944      128,697           535
                                                                                                                 
Shareholders' Equity..............          163,023           18,836           (730)        181,129        9,272          (535)
                                         ----------         --------     ----------      ----------     --------    ----------
  Total Liabilities and                                                                                                       
   Shareholders' Equity...........       $2,052,084         $172,989     $        0      $2,225,073     $137,969    $        0
                                         ==========         ========     ==========      ==========     ========    ==========
</TABLE>

<TABLE> 
<CAPTION> 
                                                                                      Westamerica
                                                                                     PV Financial,
                                        Westamerica,                                  CapitolBank
                                        PV Financial                                      and
                                       and CapitolBank                                 North Bay
                                          Pro Forma                    Pro Forma       Pro Forma
                                         Combined(1)   North Bay(1)  Adjustments(5)   Combined(1)
                                         -----------   ------------  --------------   -----------
<S>                                    <C>             <C>           <C>             <C> 
                                                                             
Assets                                                                       
 Cash and cash equivalents........      $  160,156       $ 13,669                      $  173,825   
 Interest bearing deposits in                                                                       
  other banks.....................             250          3,563                           3,813   
 Trading account securities.......               0              0                               0   
 Investment securities available-                                                                   
  for-sale........................         201,595            501                         202,096   
 Investment securities held-to-                                                                     
  maturity........................         625,519         28,292                         653,811   
 Loans, net of reserve for                                                                          
  loan losses.....................       1,283,538         55,437                       1,338,975   
 Other real estate owned and                                                                        
  loan collateral substantively                                                                     
   foreclosed.....................          12,984              0                          12,984   
 Premises and equipment, net......          26,128          3,479                          29,607   
 Interest receivable and                                                                            
  other assets....................          52,872          2,619                          55,491   
                                        ----------       --------    ----------        ----------   
   Total Assets...................      $2,363,042       $107,560    $        0        $2,470,602   
                                        ==========       ========    ==========        ==========   
                                                                                                    
Liabilities                                                                                         
 Deposits:                                                                                          
  Noninterest bearing.............      $  439,660       $ 14,733                      $  454,393   
  Interest bearing................       1,553,772         77,663                       1,631,435   
                                        ----------       --------                      ----------   
   Total deposits.................       1,993,432         92,396                       2,085,828   
 Funds purchased and other short-                                                                   
  term borrowings.................         135,373          4,770                         140,143   
 Other liabilities................          44,371            583           490            45,444   
                                         ---------       --------    ----------        ----------   
  Total Liabilities...............       2,173,176         97,749           490         2,271,415   
                                                                                                    
Shareholders' Equity..............         191,131          9,811          (490)          199,187   
                                         ---------       --------    ----------        ----------   
  Total Liabilities and                                                                             
   Shareholders' Equity...........      $2,363,042       $107,560    $        0        $2,470,602   
                                        ==========       ========    ==========        ==========   
</TABLE> 
                           
         See Notes to Unaudited Pro Forma Combined Financial Statement

                                      -61-
<PAGE>
 
           Notes to Unaudited Pro Forma Combined Financial Statements

      (1)  Westamerica, PV Financial and Pacific Valley National Bank have
           entered into an Agreement and Plan of Reorganization (as amended)
           dated as of July 25, 1994 (the "PV Financial Merger Agreement"),
           whereby the parties agreed to merge PV Financial into Westamerica.
           Westamerica, North Bay and Novato National Bank have entered into an
           Agreement and Plan of Reorganization dated as of December 8, 1994,
           whereby the parties thereto agreed to merge North Bay into
           Westamerica (the "North Bay Merger"). Subsequent thereto, Novato
           National Bank, North Bay's banking subsidiary, will be merged with
           and into Westamerica Bank. See "Information About Westamerica--
           Pending Acquisitions." It is anticipated that the PV Financial Merger
           will be consummated in the first quarter of 1995 and the North Bay
           Merger will be consummated in the second half of 1995. The
           transactions will be accounted for as poolings of interests and,
           accordingly, the Unaudited Pro Forma Combined Consolidated Statements
           of Income include the results of PV Financial and North Bay for the
           periods presented and the Unaudited Pro Forma Combined Balance Sheet
           includes the financial condition of PV Financial and North Bay on
           September 30, 1994.

           The Unaudited Pro Forma Combined Statements of Income do not include
           any pro forma adjustments as none are necessary to account for the
           Merger and Westamerica's pending acquisitions on a pooling of
           interests basis.

      (2)  The pro forma combined per share data for net income has been
           calculated using pro forma combined average shares outstanding.
           Westamerica, PV Financial and North Bay pro forma combined average
           shares outstanding has been calculated using the average number of
           shares of Westamerica Common Stock outstanding during the periods
           presented increased by the shares of Westamerica Common Stock
           expected to be issued to PV Financial and North Bay shareholders
           using exchange ratios of .5450 and .3600, respectively, of a share of
           Westamerica Common Stock for each of the average shares of PV
           Financial and North Bay common stock outstanding during each of the
           periods presented as if these shares were outstanding during each of
           the periods presented. Such Westamerica, PV Financial and North Bay
           pro forma per share data assumes no dissenting PV Financial or North
           Bay shareholders and no exercise of outstanding Westamerica, PV
           Financial or North Bay stock options or stock appreciation rights.
           The exchange ratios used in connection with the PV Financial Merger
           and North Bay Merger are subject to potential adjustments in certain
           circumstances as provided in the PV Financial and North Bay
           agreements.
      
           Westamerica, PV Financial, North Bay and CapitolBank pro forma
           combined average shares outstanding has been calculated using the
           average number of Westamerica, PV Financial and North Bay pro forma
           combined average shares outstanding during the periods presented
           increased by the shares of Westamerica Common Stock expected to be
           issued to CapitolBank shareholders using an Exchange Ratio of .0938
           of a share of Westamerica Common Stock for each of the average shares
           of CapitolBank Common Stock outstanding during each of the periods
           presented as if these shares were outstanding during each of the
           periods presented. Such pro forma per share data assumes no
           dissenting CapitolBank shareholders and no exercise of outstanding
           CapitolBank stock options. The Exchange Ratio is subject to potential
           adjustments as provided in the Agreement.
 
           See "The Merger--Exchange Ratio; Conversion of Shares of CapitolBank
           Common Stock" and "--Possible Adjustments to Exchange Ratio or
           Termination of the Agreement." See also "Pro Forma Combined Financial
           Information."


                                      -62-
<PAGE>
 
      (3)  Reflects all remaining Westamerica and PV Financial estimated merger
           related expenses not accrued as of September 30, 1994.  Such
           estimated merger related expenses are summarized below on an after
           tax basis (in thousands):
<TABLE>
<CAPTION>
 
                                      Westamerica  PV Financial        Total
                                      -----------  ------------        -----
                <S>                   <C>          <C>                 <C>  
                                                                            
                Financial advisory..         $  0          $500         $500
                Professional fees...          110            90          200
                Printing and other..           20            10           30
                                             ----          ----         ----
                  Total.............         $130          $600         $730
                                             ----          ----         ---- 
</TABLE>
      (4)  Reflects all remaining Westamerica and CapitolBank estimated Merger
           related expenses not accrued as of September 30, 1994.  Such
           estimated Merger related expenses are summarized below on an after
           tax basis (in thousands):
<TABLE>
<CAPTION>
 
                                      Westamerica  CapitolBank         Total
                                      -----------  -----------         -----
                <S>                   <C>          <C>                 <C> 
                                                                           
                Financial advisory..         $  0         $225          $225
                Professional fees...          110          170           280
                Printing and other..           20           10            30
                                             ----         ----          ----
                  Total.............         $130         $405          $535
                                             ----         ----          ----
</TABLE>
      (5)  Reflects all remaining Westamerica and North Bay estimated merger
           related expenses not accrued as of September 30, 1994.  Such
           estimated merger related expenses are summarized below on an after
           tax basis (in thousands):
<TABLE>
<CAPTION>
 
                                      Westamerica  North Bay         Total
                                      -----------  ---------         -----
                <S>                   <C>          <C>               <C> 
                                                                         
                Financial advisory..         $  0       $230          $230
                Professional fees...          110        120           230
                Printing and other..           20         10            30
                                             ----       ----          ----
                  Total.............         $130       $360          $490
                                             ----       ----          ----
 
</TABLE>

                      SUPPLEMENTAL HISTORICAL INFORMATION

           The following unaudited tables provide certain additional historical
      and pro forma combined financial information for Westamerica and
      CapitolBank.  The unaudited pro forma combined financial information
      assumes that the Merger is accounted for as a pooling of interests and
      gives effect to the Merger as if the Merger had occurred on September 30,
      1994.  The information presented below should be read in conjunction with
      the financial information set forth in "Summary--Selected Historical and
      Pro Forma Financial Data," "Pro Forma Combined Financial Information," and
      the historical financial statements of Westamerica and CapitolBank and the
      notes thereto incorporated by reference or included elsewhere herein.
      This Supplemental Historical Information is presented for informational
      purposes only and should not be considered to be indicative of actual
      results or financial position after the Merger.

                                      -63-
<PAGE>
 
           On a pro forma basis at September 30, 1994, the loan portfolio of the
      combined entity is as follows:

                      Unaudited Pro Forma Types of Loans,
                           Net of Unearned Fee Income
                               September 30, 1994
<TABLE>
<CAPTION>
 
                                                                                       Westamerica,                Westamerica
                                                               Westamerica             PV Financial               PV Financial,
                                                                   and                     and                   CapitolBank and
                                                              PV Financial             CapitolBank                  North Bay
                                                               Pro Forma                Pro Forma                   Pro Forma
                                  Westamerica   PV Financial   Combined   CapitolBank   Combined     North Bay      Combined
                                  ------------  ------------  ----------  -----------  ----------    ---------   ---------------
                                                             (In thousands)
<S>                                <C>             <C>        <C>            <C>       <C>           <C>           <C> 
 
Commercial loans................    $  563,973      $ 84,351  $  648,324      $22,390  $  670,714     $26,952       $697,666
Real estate--construction.......        38,906         7,221      46,127       27,765      73,892       3,071         76,963
Real estate--residential 
 mortgage.......................       186,822         9,635     196,457       35,891     232,348      18,855        251,203
Installment and personal........       274,631         4,629     279,260            0     279,260       7,678        286,938
Agricultural....................        26,344        28,916      55,260        3,279      58,539           0         58,539
Lease financing.................             0             0           0            0           0           0              0
                                    ----------      --------  ----------      -------  ----------     -------     ----------
 Total loans....................     1,090,676       134,752   1,225,428       89,325   1,314,753      56,556      1,371,309 
Less:  Reserve for loan losses..        27,553         1,848      29,401        1,812      31,213       1,119         32,332
                                    ----------      --------  ----------      -------  ----------     -------     ----------
 Total loans, net...............    $1,063,123      $132,904  $1,196,027      $87,513  $1,283,540     $55,437     $1,338,977
                                    ==========      ========  ==========      =======  ==========     =======     ==========
</TABLE>
           At September 30, 1994, nonperforming assets for the combined entity
are shown in the following table on a pro forma basis:

                    Unaudited Pro Forma Nonperforming Assets
                              September 30, 1994
<TABLE>
<CAPTION>
                                                                                                             Westamerica,
                                                                                     Westamerica,            PV Financial,
                                                            Westamerica              PV Financial             CapitolBank         
                                                                and                      and                      and           
                                                           PV Financial              CapitolBank               North Bay   
                                                            Pro Forma                 Pro Forma                Pro Forma     
                               Westamerica    PV Financial   Combined   CapitolBank   Combined     North Bay    Combined     
                               -----------    -------------  ---------  ------------  ---------    ---------  ------------     
                                                          (In thousands)                                              
<S>                           <C>             <C>            <C>        <C>           <C>          <C>        <C>    
                                                                                                                     
Loans 90 or more days past                                                                                           
 due and still accruing                                                                                               
 interest.....................     $   146        $ 1,240    $ 1,386        $    0    $ 1,386       $     0     $  1,386
Nonaccrual loans:                                                                                                      
 Performing...................       2,132              0      2,132             0      2,132             0        2,132    
 Nonperforming................       5,040            570      5,610         2,164      7,774         1,095        8,869
                                   -------        -------    -------        ------    -------       -------     --------
  Total nonaccrual loans......       7,172            570      7,742         2,164      9,906         1,095       11,001 
                                   -------        -------    -------        ------    -------       -------     --------
 Total nonperforming loans....       7,318          1,810      9,128         2,164     11,292         1,095       12,387

Loan collateral substantively                                                                                         
 repossessed..................       2,006              0      2,006             0      2,006             0        2,006
Other real estate owned.......      10,824            154     10,978           103     11,081             0       11,081
                                   -------        -------    -------        ------    -------       -------     --------  
 Total nonperforming assets...     $20,148        $ 1,964    $22,112        $2,267    $24,379       $ 1,095     $ 25,474
                                   =======        =======    =======        ======    =======       =======     ========
Reserve for loan losses as                                                                                           
 a percentage of nonperforming                                                                                        
 loans........................      377.00%        102.00%    322.00%        84.00%    276.00%       102.00%      261.00%
Nonperforming loans as a                                                                                              
 percentage of total loans....        0.67           1.34       0.74          2.42       0.86          1.94         0.90
Nonperforming assets as a                                                                                             
 percentage of total assets...        0.98           1.14       0.99          1.64       1.03          1.02         1.03
</TABLE>

     The following tables present the actual regulatory capital positions of
each of Westamerica and CapitolBank as of September 30, 1994, and a pro forma
combined regulatory capital position giving effect to the Merger:

                                      -64-
<PAGE>
 
                Unaudited Pro Forma Regulatory Capital Position
                           As of September 30, 1994
<TABLE>
<CAPTION>
                                                                                 Westamerica                         Westamerica,
                                                                                     and                             PV Financial
                                                                                 PV Financial                      and CapitolBank
                                                                                  Pro Forma                            Pro Forma 
                               Westamerica              PV Financial              Combined         CapitolBank         Combined   
                        --------------------------  ----------------------  ------------------  ----------------  ------------------

                          Amount         Ratio       Amount      Ratio        Amount    Ratio    Amount   Ratio     Amount    Ratio
                        -----------  -------------  --------  ------------  ----------  ------  --------  ------  ----------  ------

                                                                       (In thousands)                                            
<S>                     <C>          <C>            <C>       <C>           <C>         <C>     <C>       <C>     <C>         <C>
                       
Tier 1 Capital.......   $  163,856         12.39%  $ 18,922        12.81%  $  182,778  12.44%  $  9,497   9.78%  $  192,275  12.27%
Minimum requirement..       52,880          4.00      5,906         4.00       58,786   4.00      3,886   4.00       62,672   4.00
                        ----------         -----   --------        -----   ----------  -----   --------  -----   ----------  -----
Excess...............   $  110,967          8.39%  $ 13,016         8.81%  $  123,992   8.44%  $  5,611   5.78%     129,603   8.27%
                        ==========         =====   ========        =====   ==========  =====   ========  =====   ==========  =====
                       
Total Capital........   $  200,517         15.17%  $ 20,768        14.07%  $  221,285  15.06%  $ 10,719  11.04%  $  232,004   4.81%
Minimum requirement..      105,759          8.00     11,813         8.00      117,572   8.00      7,771   8.00      125,343   8.00
                        ----------         -----   --------        -----   ----------  -----   --------  -----   ----------  -----
Excess...............   $   94,758          7.17%  $  8,955         6.07%  $  103,713   7.06%  $  2,948   3.04%     106,661   6.81%
                        ==========         =====   ========        =====   ==========  =====   ========  =====   ==========  =====
                       
Risk-adjusted assets.   $1,321,989                 $147,657                $1,469,646          $ 97,143          $1,566,789
                        ==========                 ========                ==========          ========          ==========
                       
Tier 1 Capital.......   $  163,856          7.98%  $ 18,922        11.15%  $  182,778   8.23%  $  9,497   6.93%  $  192,275   8.15%
Minimum leverage       
 requirement.........       82,092          4.00      6,786         4.00       88,878   4.00      5,485   4.00       94,363   4.00
                        ----------         -----   --------        -----   ----------  -----   --------  -----   ----------  -----
Excess...............   $   81,764          3.98%  $ 12,136         7.15%  $   93,900   4.23%  $  4,012   2.93%  $   97,912   4.15%
                        ==========         =====   ========        =====   ==========  =====   ========  =====   ==========  =====
                       
Average total assets.   $2,052,306                 $169,643                $2,221,949          $137,128          $2,359,077
                        ==========                 ========                ==========          ========          ==========
 
<CAPTION> 

                                                     Westamerica,
                                                    PV Financial,
                                                     CapitolBank
                                                    and North Bay
                                 North Bay        Pro Forma Combined
                            -----------------     ------------------

                            Amount      Ratio      Amount      Ratio
                            ------      -----      ------      -----

                                          (In thousands) 
<S>                         <C>        <C>         <C>         <C>  
                      
Tier 1 Capital.......       $9,811      15.28%     $202,086    12.39%   
Minimum requirement..        2,568       4.00        65,240     4.00 
                            ------      -----     ---------     ---- 
Excess...............       $7,243      11.28%     $136,846     8.39%
                            ======      =====     =========     ==== 
                      
Total Capital........      $10,617      16.54%     $242,621    14.88% 
Minimum requirement..        5,136       8.00       130,479     8.00
                            ------      -----     ---------     ---- 
Excess...............      $ 5,481       8.54%     $112,142     6.88%
                            ======      =====     =========     ==== 
                       
Risk-adjusted assets.      $64,206               $1,630,995
                            ======               ==========
                      
Tier 1 Capital.......      $ 9,811       8.72%     $202,086     8.18%
Minimum leverage      
 requirement.........        4,502       4.00        98,865     4.00
                            ------      -----     ---------     ---- 
Excess...............      $ 5,309       4.72%   $  103,221     4.18% 
                            ======      =====     =========     ==== 
                      
Average total assets.     $112,555               $2,471,632
                           =======                ========= 

</TABLE>
                     MARKET PRICE AND DIVIDEND INFORMATION

Market Quotations

     Westamerica Common Stock is listed and traded on NNM and CapitolBank Common
Stock is traded on the over-the-counter market and quoted on the Pink Sheets. As
of the Record Date, there were approximately ________ holders of record of
Westamerica Common Stock and approximately 1,071 holders of record of
CapitolBank Common Stock.

                                      -65-
<PAGE>
 
     The following table sets forth for Westamerica Common Stock the high and
low closing prices for the quarters indicated. The table sets forth for
CapitolBank Common Stock the approximate high and low bid prices of which
CapitolBank is aware, which prices reflect interdealer prices without retail
mark-up, mark-down or commissions and may not necessarily represent actual
transactions.

<TABLE>
<CAPTION>
                                       Westamerica           CapitolBank
                                       Common Stock          Common Stock
                                   --------------------  -------------------
                                    High       Low           High       Low
                                   ------  ------------  ------------  -----
       <S>                         <C>     <C>           <C>           <C>
 
      1992
         First Quarter...........  $20.63        $18.88         $2.50  $2.00
         Second Quarter..........   22.25         18.50          2.50   2.00
         Third Quarter...........   22.25         18.25          2.50   2.00
         Fourth Quarter..........   23.75         19.50          2.50   2.00
 
      1993
         First Quarter...........  $30.25        $22.13         $1.50  $1.25
         Second Quarter..........   28.75         23.88          1.50   1.25
         Third Quarter...........   28.50         25.13          1.75   1.25
         Fourth Quarter..........   28.50         25.75          1.75   1.50
 
      1994
         First Quarter...........  $29.00        $25.88         $1.75  $1.50
         Second Quarter..........   32.50         27.25          2.00   1.75
         Third Quarter...........   33.25         29.25          2.25   2.00
         Fourth Quarter through
            December ___, 1994
</TABLE>

     On November 17, 1994, the trading day prior to the first public
announcement of the Merger, the high, low and closing prices for Westamerica
Common Stock on NNM were $30.50, $29.75 and $30.50, respectively.

     On November 17, 1994, the last day on which trades in CapitolBank Common
Stock were quoted on the Pink Sheets prior to the first public announcement of
the Merger, the bid and asked prices for CapitolBank Common Stock, as quoted on
the Pink Sheets, were $1.75 and $2.00, respectively.

                                      -66-
<PAGE>
 
      Dividends and Dividend Policy

           The following table sets forth the per share cash dividends declared
      by Westamerica and CapitolBank during each quarter since January 1, 1992.
<TABLE>
<CAPTION>
 
                           Westamerica   CapitolBank
                           Common Stock  Common Stock
                           ------------  ------------
<S>                        <C>           <C>
 
      1992
         First Quarter...         $0.12         $0.00
         Second Quarter..          0.13          0.00
         Third Quarter...          0.13          0.00
         Fourth Quarter..          0.13          0.00
 
      1993
         First Quarter...         $0.14         $0.00
         Second Quarter..          0.14          0.00
         Third Quarter...          0.14          0.00
         Fourth Quarter..          0.15          0.00
 
      1994
         First Quarter...         $0.15         $0.00
         Second Quarter..          0.15          0.00
         Third Quarter...          0.17          0.00
         Fourth Quarter..          0.17          0.00
</TABLE>

           Westamerica has paid quarterly cash dividends since it commenced
      operations on January 1, 1973. Westamerica and CapitolBank are subject to
      certain regulatory and contractual restrictions on their respective
      ability to pay dividends.  Holders of Westamerica Common Stock and
      CapitolBank Common Stock are entitled to receive dividends as and when
      declared by the Board of Directors of Westamerica and CapitolBank,
      respectively, out of funds legally available therefor under the laws of
      the State of California.  The GCL provides that a corporation may make a
      distribution to its shareholders if the corporation's retained earnings
      equal at least the amount of the proposed distribution.  The GCL further
      provides that in the event sufficient retained earnings are not available
      for the proposed distribution a corporation may nevertheless make a
      distribution to its shareholders if, after giving effect to the
      distribution, it meets two conditions, which generally stated are as
      follows:  (i) the corporation's assets must equal at least 125% of its
      liabilities; and (ii) the corporation's current assets must equal at least
      its current liabilities or, if the average of the corporation's earnings
      before taxes on income and before interest expense for the two preceding
      fiscal years was less than the average of the corporation's interest
      expense for such fiscal years, then the corporation's current assets must
      equal at least 125% of its current liabilities.

           Westamerica is also subject to certain restrictions on its ability to
      pay dividends under the terms of a certain debt agreement.  See
      "Description of Westamerica Capital Stock and Indebtedness--Debt
      Agreements."

           Under the California Financial Code, CapitolBank may not pay cash
      dividends without the prior approval of the Superintendent until such time
      as the deficit in CapitolBank's undivided profits is restored and there
      are sufficient earnings to cover any proposed dividend.

           The Agreement prohibits Westamerica from paying any dividends other
      than its regular quarterly cash dividend in amounts substantially
      equivalent to dividends paid in the pattern of declarations and payments
      established in the 18 months prior to November 17, 1994.  A declaration by
      Westamerica of a quarterly dividend up to two cents per share per quarter
      higher (on a cumulative basis) than the most recent previous quarterly
      dividend will be deemed to meet this 18-month standard.  The Agreement
      also prohibits CapitolBank from paying any dividends.

                                      -67-
<PAGE>
 
                   MANAGEMENT'S  DISCUSSION AND ANALYSIS OF
          FINANCIAL CONDITION AND RESULTS OF OPERATIONS OF CAPITOLBANK

           The following analysis of CapitolBank's financial condition and
      results of operations for the years ended December 31, 1993, 1992 and 1991
      and the nine months ended September 30, 1994 and 1993 should be read in
      conjunction with CapitolBank's audited financial statements and related
      notes thereto and the unaudited interim historical financial statements of
      CapitolBank appearing elsewhere in this Proxy Statement/Prospectus and
      incorporated herein by reference.  Average balances, including balances
      used in calculating certain financial ratios, are generally comprised of
      average daily balances.  Amounts shown are consolidated unless stated
      otherwise.


      Results of Operations

      Net Income

           CapitolBank's net income was $315,121 for the year ended December 31,
      1993, representing earnings per share of $0.08.  This represents
      improvement over the 1992 loss of $1,863,569 ($0.46 loss per share) and a
      49.1% increase from 1991 earnings of $211,360 ($0.05 per share).  The
      increase in net income during 1993 when compared to 1992 was principally
      due to increases in the size of CapitolBank's loan portfolio, an
      improvement in the net interest margin due primarily to reduced interest
      expense while maintaining loan interest rates constant, and reductions in
      other real estate owned, legal fees and other expenses.  Results in 1992
      were also negatively impacted by a one-time charge to income of $1,060,000
      resulting from the divestiture of a real estate joint venture undertaken
      in 1990 by Capitol Commerce Development Company VI, a wholly-owned
      subsidiary of CapitolBank.

           Consolidated net income for the nine months ended September 30, 1994
      and 1993 were $281,000 and $164,000, respectively.  Net earnings per share
      for the nine months ended September 30, 1994 and 1993 were $0.07 and
      $0.04, respectively.  The increase in net income is primarily due to an
      increase in loan volume and a higher prime lending rate.

           Return on average equity for the years ended December 31, 1993, 1992
      and 1991 was 3.57%, (21.66%) and 1.95%, respectively.  CapitolBank's risk-
      based capital ratio at December 31, 1993 was 12.90% compared to 14.58% at
      December 31, 1992.  These ratios are in excess of the Federal Reserve
      Board's requirement of 8.00%.

      Net Interest Income

           Net interest income, the primary component of bank revenue, is the
      difference between interest and loan fees earned by CapitolBank on its
      earning assets and the interest expense paid on its interest-bearing
      deposit liabilities and other borrowed funds.  Net interest income,
      expressed as a percentage of average total earning assets, is referred to
      as net interest margin.

           CapitolBank's net interest income of $6,279,701 in 1993 represented a
      $435,607 (7.5%) increase when compared to 1992.  This increase resulted
      from the combination of a $3,936,000 (6.0%) increase in average loans, a
      $5,174,000 (24.1%) reduction in average time deposits and a 15.3% decrease
      in the average cost of funds. The decrease in time deposits is the result
      of CapitolBank's management's efforts to shift its deposit mix from time
      deposits to interest-bearing transaction accounts. The decrease in the
      average cost of funds resulted from the shift in the deposit mix combined
      with a general decline in deposit interest rates.

           During 1992, net interest income declined 18.28% to $5,844,094 from
      $7,151,037 in 1991.  This was due to a combination of decreasing interest
      rates and a decreasing loan portfolio.  The average prime rate for the
      year ended December 31, 1992 was 6.29% compared to 8.46% for the year
      ended December 31, 1991.  These two factors contributed to the decrease in
      the yield on interest-earning assets from 10.08% in 1991 to 8.17% in 1992.

           The rate paid on interest-bearing liabilities decreased from 5.54% in
      1991 to 3.67% in 1992.  This decrease was due primarily to repricing of
      deposits periodically throughout the year in response to decreases in
      CapitolBank's prime lending rate and market conditions affecting the
      financial industry.

                                      -68-
<PAGE>
 
           Net interest income increased to $5,632,000 for the nine months ended
      September 30, 1994, from $4,585,000 for the same period for 1993.  The net
      increase was composed of increased total interest income of $878,000 and
      decreased total interest expense of $169,000.  The increase in interest
      income is primarily due to the increase in loan volume and a higher prime
      rate.

           The tables below set forth consolidated average daily balances of
      each principal category of assets, liabilities and shareholders' equity,
      interest on interest earning assets, and interest on interest bearing
      liabilities, and the average yields earned or rates paid thereon for the
      periods indicated. The tables also show the net interest earnings and the
      net yield on average earning assets.

<TABLE> 
<CAPTION> 
                                                                   Consolidated Average Daily Balances
 
                                                                          Year Ended December 31,
                                        -------------------------------------------------------------------------------------------
                                                     1993                           1992                           1991
                                        -----------------------------  -----------------------------  -----------------------------
                                                   Interest   Rates               Interest   Rates               Interest   Rates
                                         Average   Income/   Earned/    Average   Income/   Earned/    Average   Income/   Earned/
                                         Balance   Expense     Paid     Balance   Expense     Paid     Balance   Expense     Paid
                                        ---------  --------  --------  ---------  --------  --------  ---------  --------  --------
                                                                               (In thousands)
<S>                                     <C>        <C>       <C>       <C>        <C>       <C>       <C>        <C>       <C>
 
Federal funds sold....................  $  5,910     $  162     2.7%   $  4,683     $  147     3.14%  $  4,121    $   248     6.02%
Interest bearing deposits with
 other financial institutions.........     3,023        121     4.00      5,706        377     6.61      8,490        620     7.30
Investment securities.................
 U.S. Treasury securities.............    24,375      1,548     6.35     23,241      1,575     6.78     21,729      1,660     7.64
 U.S. Government Agencies.............     6,045        390     6.45      5,728        445     7.77     10,507        904     8.60
 Other securities.....................     1,323         50     3.78      6,385        247     3.87      3,378        174     5.15
Loans(1)(2)...........................    69,954      6,680     9.55     66,018      6,334     9.59     75,638      8,882    11.74
                                        --------     ------            --------     ------            --------    -------
 
 Total Interest-Earning Assets........   110,630      8,951     8.09%   111,761      9,125     8.17%   123,863     12,488    10.08%
                                                     ------                         ------                        -------
 
 
Cash and due from banks...............     8,587                          8,664                          7,302
Furniture, fixtures and equipment.....     1,636                          1,982                          2,157
Interest receivable and other assets..     2,508                          3,536                          3,700
Allowance for loan losses.............    (1,268)                        (1,400)                        (1,306)
                                        --------                       --------                       --------
 
 Total Assets.........................  $122,093                       $124,543                       $135,716
                                        ========                       ========                       ========
 
Interest-bearing transaction
 accounts.............................    63,781      1,869     2.93%    62,670      2,090     3.33%    60,234      2,971     4.93%
Savings accounts......................     4,133        128     3.10      4,216        154     3.65      2,196        115     5.24
Time accounts.........................    16,324        634     3.88     21,498        996     4.63     31,897      2,164     6.78
Other borrowed funds..................     1,614         40     2.48      1,092         41     3.75      2,084         87     4.17
                                        --------     ------            --------     ------            --------    -------
 
 Total Interest-Bearing
 Liabilities..........................    85,852      2,671     3.11%    89,476      3,281     3.67%    96,411      5,337     5.54%
 
Demand accounts.......................    26,889                         25,444                         27,685
Accrued expenses and other
 liabilities..........................       527                          1,017                            781
Shareholders' equity..................     8,825                          8,606                         10,839
                                        --------                       --------                       --------
 
 Total Liabilities and
 Shareholders' Equity.................  $122,093                       $124,543                       $135,716
                                        ========                       ========                       ========
 
Net Interest Income...................               $6,280                         $5,844                        $ 7,151
                                                     ======                         ======                        =======
 
Net Interest Margin...................                          4.98%                          4.50%                          4.54%
 
</TABLE>
      (1)  Nonaccruing loans not yet charged off have been included in average
           loan balances.

                                      -69-
<PAGE>
 
      (2)  Loan fees of $808,000 in 1993, $741,000 in 1992, and $1,068,000 in
           1991 were included in interest income for loans.

                                           Consolidated Average Daily Balances
<TABLE>
<CAPTION>
                                                           Nine Months Ended September 30,
                                             -----------------------------------------------------------
                                                         1994                           1993
                                             -----------------------------  ----------------------------
                                                       Interest    Rates              Interest    Rates
                                              Average   Income/   Earned/    Average   Income/  Earned/
                                              Balance   Expense    Paid      Balance   Expense    Paid
                                             ---------  -------  ---------  ---------  -------  --------
                                                                   (In thousands)
      <S>                                    <C>        <C>      <C>        <C>        <C>      <C>
 
      Federal funds sold...................  $  6,123    $  193      4.16%  $  6,028    $  124     2.72%
      Interest bearing deposits in
        other banks........................       120         5      5.49      2,895       110     5.10
      Securities (taxable).................    30,613     1,270      5.47     32,374     1,522     6.20
      Loans(1)(2)..........................    79,964     6,032      9.95     66,103     4,866     9.84
                                             --------    ------     -----   --------    ------     ----
        Total Interest-Earning Assets......   116,820     7,500      8.47%   107,400     6,622     8.13%
 
      Cash and due from banks..............     9,080         0                9,873         0
      Allowance for loan losses............    (1,573)        0               (1,243)        0
      Premises & equipment.................     1,387         0                1,672         0
      Other assets.........................       958         0     3,684          0
                                             --------    ------     -----   --------
        Total Assets.......................  $126,672    $7,500             $121,386    $6,622
                                             ========    ======             ========    ======
 
      Interest bearing demand deposits.....  $ 65,092    $1,314      2.66%  $ 64,020    $1,421     2.93%
      Savings deposits.....................     4,228        95      2.96      4,201        98     3.13
      Other time deposits..................    14,864       418      3.71     16,262       475     3.85
      Federal funds purchased..............        11         1      4.44          0         0        0
      Short term debt......................     1,899        41      2.85      1,708        32     2.50
                                             --------    ------     -----   --------    ------     ----
        Total interest bearing
         liabilities.......................    86,094     1,869      2.86%    86,191     2,026     3.10%
 
      Non interest bearing deposits........    30,183                         26,533
      Other Liabilities....................     1,117                            904
      Shareholders' Equity.................     9,278                          7,758
                                             --------    ------             --------    ------    
 
      Total Liabilities and Shareholders'
        Equity.............................  $126,672                       $121,386
                                             ========                       ========
      Net Interest Income..................             $  5,631                        $4,596
                                                        ========                        ======
      Net Interest Margin..................                             5.61%                      5.03%
                                                                    ========                       ====
 
</TABLE>
     --------------------------------------
      (1)  Nonaccruing loans not yet charged off have been included in average
           loan balances.

      (2)  Loan fees of $854 for the nine months ended September 30, 1994 and
           $548 for the nine months ended September 30, 1993 were included in
           interest income for loans.

                                      -70-
<PAGE>
 
           Rate and Volume Variances.  The following table sets forth a summary
      of the changes in average assets and liability balances (volume) and
      changes in average interest rates (rate) for the periods indicated.
      Changes not solely attributable to volume or rate have been allocated to
      volume.

<TABLE>
<CAPTION>
                                  Nine Months 
                               Ended September 30,                            Year Ended December 31,
                             ------------------------  -----------------------------------------------------------------------------

                                  1994 over 1993                    1993 over 1992                         1992 over 1991
                             ------------------------  ---------------------------------------  ------------------------------------

                             Volume    Rate    Total     Volume      Rate          Total            Volume         Rate      Total
                             -------  ------  -------  ----------  ---------  ----------------  ---------------  --------  ---------

                                                                       (In thousands)
<S>                          <C>      <C>     <C>      <C>         <C>        <C>               <C>              <C>       <C>
Increase (decrease) in
 interest and
  fee income:
Federal funds sold.........   $  29   $  40   $   69        $ 39   $    (24)  $            15   $           34   $  (135)   $  (101)

Interest-bearing deposits
 with other financial
  institutions.............    (104)     (1)    (105)       (177)       (79)             (256)            (203)      (40)      (243)

Investment securities:
 U.S. Treasury securities..    (150)    (87)    (237)         77       (104)              (27)             116       (201)      (85)

 U.S. Government Agencies..      43     (45)      (2)         26        (80)              (54)            (411)      (49)      (460)

 Other securities..........     (26)     13      (13)       (197)        (1)             (198)             155       (81)        74
Loans......................     910     257     1167         378        (32)              346           (1,130)   (1,418)    (2,548)
                              -----   -----   ------        ----   --------   ---------------   --------------   -------   --------
 Total.....................     702     177      879         146       (320)             (174)          (1,439)   (1,924)    (3,363)

 
Increase (decrease) in
 interest expense:
Deposits:
Interest-bearing
 transaction
  accounts.................      22    (129)    (107)         37       (257)             (220)             120    (1,001)      (881)

Savings accounts...........       0      (3)      (3)         (3)       (23)              (26)             106       (68)        38
Time accounts..............     (39)    (28)     (67)       (240)      (123)             (363)            (705)     (462)    (1,167)

Other borrowed funds.......      (4)     (5)      (9)         20        (21)               (1)             (42)       (4)       (46)
                              -----   -----   ------        ----   --------   ---------------             ----   -------    -------
 Total.....................     (21)   (165)    (186)       (186)      (424)             (610)            (521)   (1,535)    (2,056)
                              -----   -----   ------   ---------   --------   ---------------   --------------   -------   --------
 
Changes in Net Interest
 Income....................   $ 723   $ 342   $1,065        $332   $    104   $           436   $         (918)  $  (389)   $(1,307)
                              =====   =====   ======        ====   ========   ===============   ==============   =======    =======
</TABLE>

      Allowance for Loan Losses

           The purpose of the allowance for loan losses is to provide a reserve
      sufficient in the view of management to cover loan losses which can
      reasonably be anticipated.  To determine the level of reserves needed,
      CapitolBank reviews, on a monthly basis, the quality of its loans, the
      general economic conditions, historical loan loss experience and other
      pertinent data.

           At September 30, 1994, the allowance for loan losses totaled
      $1,812,136 or 2.01% of gross loans.  This compares to $1,405,784 or 1.83%
      of total loans at December 31, 1993 and $1,170,174 or 1.80% of total loans
      at December 31, 1992.  The activity in the allowance for loan losses is
      summarized as follows:

<TABLE>
<CAPTION>
                             Nine Months Ended
                               September 30,         Year Ended December 31,
                             ----------------  --------------------------------------
                                  1994            1993         1992          1991
                             ----------------  -----------  -----------  ------------
<S>                          <C>               <C>          <C>          <C>
 
      Balance at beginning
       of period...........  $1,405,784        $1,170,174   $1,122,597   $ 1,161,245
      Provision for loan                
       losses..............     285,000           436,000      519,778     1,066,823
      Recoveries...........     135,866           160,959      207,617        44,209
      Loans charged off....     (14,514)         (361,349)    (679,818)   (1,149,680)
                             ----------        ----------   ----------   -----------
      Balance, end of year.  $1,812,136        $1,405,784   $1,170,174   $ 1,122,597
                             ==========        ==========   ==========   ===========
</TABLE>

           As of September 30, 1994, nonaccrual loans were $2,164,000.  As of
      December 31, 1993 and 1992, loans totaling approximately $138,000 and
      $2,449,000, respectively, were on nonaccrual status.

           The aggregate effect of nonaccrual loans was to reduce interest
      income by approximately $87,000, $159,000, and $248,000 for the years
      ended December 31, 1993, 1992 and 1991, respectively.  Interest income was
      reduced by $115,000 for nonaccrual loans for the nine months ended
      September 30, 1994.  The increase of interest 

                                      -71-
<PAGE>
 
      forgone on nonaccrual loans from December 31, 1993 to September 30, 1994
      is primarily due to one real estate loan of approximately $1,000,000. That
      real estate loan has a low loan to value ratio and full repayment is
      expected.

           Management continues to review the adequacy of the allowance for
      possible loan losses, keeping in mind economic factors, loan portfolio
      composition, industry strength, the general level of real estate values,
      the California recession, toxic waste and environmental clean up costs and
      other factors considered to be relevant by management.  At September 30,
      1994, management considered CapitolBank's allowance to be adequate as an
      allowance against foreseeable losses in its portfolio.


      Noninterest Income

           Noninterest income is composed of service charges on deposit
      accounts, securities gains, real estate joint venture revenue, trust fees
      and commissions, gains resulting from the disposition of other real estate
      owned and other income.  Noninterest income was $1,213,053 in 1993
      compared to $1,290,233 in 1992 and $1,670,837 in 1991.  For the nine
      months ended September 30, 1994 and September 30, 1993, noninterest income
      was $778,000 and $975,000, respectively.

           Trust services revenue decreased 2.3% during 1993 as compared to 1992
      and increased 8.8% during 1992 as compared to 1991.  During the first
      quarter of 1992, a major trust account was terminated.  The 2.3% decrease
      in trust revenue during 1993 as compared to 1992 was principally due to
      the loss of that account.  For the nine months ended September 30, 1994
      and September 30, 1993, trust services revenue was $547,000 and $501,000,
      respectively.

           Service charges on deposit accounts decreased $94,595 (42.4%) during
      1993 as compared to 1992.  The decrease is attributable to the loss of one
      account relationship.  CapitolBank's direct costs associated with the
      administration of this account were reduced by approximately $80,000,
      thereby resulting in an immaterial impact on the overall results of
      operations.  For the nine months ended September 30, 1994 and September
      30, 1993, service charges on deposit accounts were equal to $74,000 and
      $97,000, respectively.

           During 1993, CapitolBank reported gains of $49,197 on the sale of
      other real estate owned.  This was the result of CapitolBank selling other
      real estate owned with a carrying value of $893,000.

           Consistent with management's commitment to emphasize core banking
      revenue sources, during 1993, CapitolBank completely divested itself of
      all real estate joint venture activity.  Gross income from real estate
      development projects totaled $0, $28,000 and $130,797 during the years
      ended December 31, 1993, 1992 and 1991, respectively.

           The following reflects the components of noninterest income for the
      periods indicated:

<TABLE>
<CAPTION>
                                                                                                           
                              Nine Months Ended September 30,                              Year Ended December 31,                  
                           --------------------------------------     ------------------------------------------------------------- 
                                 1994                   1993                   1993                  1992                 1991      
                           --------------------------------------     ------------------------------------------------------------- 
                            Amount     %         Amount       %         Amount       %        Amount       %        Amount      %  
                           --------  -------   ----------  ------     ----------  -----   -------------  -----   ----------  ------
<S>                        <C>       <C>       <C>         <C>        <C>         <C>      <C>           <C>     <C>         <C>   
                                                                                                                                   
Noninterest income:                                                                                                                
Trust fees and                                                                                                                     
 commissions.............  $547,000   70.3%    $495,969    51.0%      $  689,221   56.8%   $  705,291     54.7%  $  648,418   38.8% 
Gains on securities                                                                                                                 
 transactions, net.......    82,000   10.5      282,729    29.0          282,729   23.3       268,619     20.8      448,694   26.9  
Service charges on                                                                                                                  
 deposit accounts........    74,000    9.5      120,842    12.4          128,711   10.6       223.306     17.3      227,427   13.6  
Gains on sale of other                                                                                                              
 real estate.............        --     --       49,197     5.0           49,197    4.1        16,960      1.3      149,195    8.9  
Real estate development                                                                                                             
 revenue.................        --     --            0     0.0               --     --        28,000      2.2      130,797    7.8  
Other income.............    75,000    9.7       25,346     2.6           63,195    5.2        48,057      3.7       66,306    4.0  
                           --------  -----     --------   -----       ----------   ----    ----------     ----   ----------   ----  
                                                                                                                                    
 Total...................  $778,000  100.0%    $974,083   100.0%      $1,213,053  100.0%   $1,290,233    100.0%  $1,670,837  100.0% 
                           ========  =====     ========   =====       ==========  =====    ==========    =====   ==========  =====
</TABLE>

                                      -72-
<PAGE>
 
      Noninterest Expense

           Noninterest expense includes salaries and benefits, occupancy costs,
      equipment and other expenses.  These costs represent not only the cost of
      on-going operations but, to some extent, an investment toward future
      growth and profitability.  The following table summarizes the significant
      components of noninterest expense for the periods indicated:

<TABLE>
<CAPTION>
                                                                                                              
                              Nine Months Ended September 30,                    Year Ended December 31,                 
                             --------------------------------      -----------------------------------------------  
                                 1994              1993                  1993             1992              1991      
                             --------------------------------      ----------   ---------------   ----------------  
      <S>                        <C>             <C>               <C>              <C>               <C>            
                                                                                                                     
      Salaries and benefits      $2,998,000      $2,560,133        $3,379,284        $3,359,829        $3,186,070    
      Occupancy............       1,135,000       1,052,935         1,402,170         1,439,257         1,371,807    
      Equipment............         288,000         300,587           396,701           417,270           391,793    
      Divestiture of joint                                                                                           
       venture                                                                                                       
        investment.........               0               0                 0         1,060,000                 0    
      Provision for loss                                                                                             
       on other real                                                                                                 
        estate.............               0               0            61,721           466,000                 0    
      Special shareholder                                                                                            
       meeting.............               0               0                 0                 0           712,822    
      Professional services         188,000         117,262           148,768           233,619           276,990    
      All other                                                                                                      
       noninterest expenses       1,180,000       1,003,075         1,274,489         1,502,143         1,533,756    
                                 ----------      ----------        ----------        ----------        ----------    
        Total..............      $5,789,000      $5,033,992        $6,663,133        $8,478,118        $7,473,238    
                                 ==========      ==========        ==========        ==========        ==========    
</TABLE>

           Noninterest expense decreased $1,814,985 (21.4%) to $6,663,133 in
      1993 from $8,478,118 in 1992.  Noninterest expense increased $1,004,880
      (13.5%) in 1992 as compared to 1991.

           Salaries and benefits increased $19,455 (0.58%) to $3,379,284 during
      1993 as compared to $3,359,829 in 1992.  Salaries and benefits totaled
      $3,186,070 during 1991.  The nominal increase during 1993 reflects the
      effects of the 1993 salary and hiring freeze.  The increase in 1992 is
      due, in part, to the hiring of additional senior level personnel.

           Occupancy costs decreased $37,087 (2.6%) to $1,402,170 during 1993 as
      compared to $1,439,257 in 1992 and $1,371,807 in 1991.  The decrease in
      1993 is due to a reduction in general operating costs on the CapitolBank
      building.  For the years ended December 31, 1993, 1992 and 1991,
      CapitolBank collected $190,054, $188,943 and $183,331, respectively, in
      rental payments pursuant to sublease agreements with unrelated third
      parties.  In accordance with the terms of the lease on the CapitolBank
      building, the rent increased on April 1, 1994 based upon the three year
      increase in the February 1991 Consumer Price Index.

           Occupancy costs on CapitolBank's main banking facility continue to
      have a negative effect on earnings.  The current monthly lease rate of
      $3.89 per square foot significantly exceeds current market rates.  The
      lease was initiated in 1985 and provides for an additional rent 
      escalation in 1997. To date, CapitolBank's landlord has been unwilling to
      renegotiate this lease.

           Equipment expense decreased by $20,569 (4.9%) in 1993 as compared to
      an increase of $25,477 in 1992 from 1991.  The increase in 1992 is
      attributable to an expansion of CapitolBank's computer system, including
      the addition of "CapitolAccess," a product which enables customers to
      access their accounts via their own personal computer.

           During 1992, CapitolBank divested itself of a real estate joint
      venture which resulted in a charge of $1,060,000 against income.

           The provision for loss on other real estate of $61,721 in 1993 and
      $466,000 in 1992 reflects the decline in the fair market value of real
      estate acquired through foreclosure.  Fair value is generally determined
      based upon periodic independent third party appraisals.

                                      -73-
<PAGE>
 
           During 1993, CapitolBank reduced the level of service provided by
      outside consultants which resulted in an $84,851 (36.3%) reduction in
      professional services.

           All other noninterest expenses decreased $227,654 (15.2%) to
      $1,274,489 during 1993 as compared to $1,502,143 in 1992 and $1,533,756 in
      1991.  A portion of the decrease in 1993 as compared to 1992 is
      attributable to an $80,000 reduction in expenses associated with the
      administration of one customer account that was terminated during 1992.
      The balance of the reductions are the result of cost control efforts
      initiated during mid-1992. For the nine months ended September 30, 1994
      and 1993, total noninterest expense was $5,789,000 and $5,034,000,
      respectively.  The net increase in 1994 was due to three factors: one-time
      payments made to the former president of CapitolBank in April 1994; the
      rent increase on the CapitolBank building in March 1994; and legal fees
      associated with the Tyler v. Wickland lawsuit.

           For the nine months ended September 30, 1994, legal fees
      associated with the Tyler v. Wickland litigation were $161,000.
      Subsequent to September 30, 1994, an additional $166,000 of legal fees
      associated with the lawsuit have been incurred for a total of $327,000 for
      the year.


      Loans

           CapitolBank is not involved in foreign lending.  CapitolBank
      generates loans primarily within the four-county Sacramento Metropolitan
      Statistical Area.  The principal types of loans are commercial loans and
      lines of credit, real estate construction and commercial real estate
      mortgage.

           The following table sets forth certain information regarding
      CapitolBank's loan portfolio.
<TABLE>
<CAPTION>
 
                                                                         
                              September 30,             December 31, 
                              ------------- ------------------------------------
                                  1994         1993         1992         1991
                              ------------- ----------  -----------  -----------
<S>                           <C>          <C>          <C>          <C> 
Real estate construction....  $27,872,888  $21,188,594  $12,439,932  $21,404,741
Real estate mortgage........   36,039,508   30,684,510   27,410,064   20,005,968
Commercial and agricultural.   23,008,074   21,637,422   21,437,041   23,069,280
Consumer installment........    2,155,588    2,196,718    2,863,165    4,359,783
Other.......................    1,123,942    1,041,009      688,221      920,915
                              -----------  -----------  -----------  -----------
Total loans.................  $90,200,000  $76,748,253  $64,838,423  $69,760,687
                              ===========  ===========  ===========  ===========
</TABLE>

           The following table sets forth cumulative maturity distributions as
      of the dates indicated for loans with fixed and floating interest rates.
      CapitolBank is unable to present the information by category of loan
      without undue burden and expense.

<TABLE>
<CAPTION>
 
                             December 31, 1993
                                 Maturing
            ----------------------------------------------------------
                            After one                                   
            One Year or   year through    Greater than                  
                Less        five years     five years         Total         
            -----------   ------------    ------------    ------------    
<S>         <C>           <C>             <C>             <C>  
 
Fixed.....  $ 1,556,000    $ 2,060,000     $ 3,041,000     $ 6,657,000
Floating..   33,669,263     28,137,813       8,284,177      70,091,253
            -----------    -----------     -----------     -----------
Total.....  $35,225,263    $30,197,813     $11,325,177     $76,748,253
            ===========    ===========     ===========     ===========
<CAPTION> 
                             September 30, 1994
                                 Maturing
            ----------------------------------------------------------
                            After one                                   
            One Year or   year through    Greater than                  
                Less        five years     five years         Total         
            -----------   ------------    ------------    ------------    
<S>         <C>           <C>             <C>             <C>  
                                                                        
Fixed.....  $ 1,369,000    $ 2,863,000     $ 2,432,000     $ 6,664,000  
Floating..   40,127,625     34,373,345       9,035,030      83,536,000  
            -----------    -----------     -----------     -----------  
Total.....  $41,496,625    $37,236,345     $11,467,030     $90,200,000  
            ===========    ===========     ===========     ===========   
</TABLE>

                                      -74-
<PAGE>
 
           The performance of loans, other than installment loans, is evaluated
      primarily on the basis of a review of each customer relationship over a
      period of time and the judgment of senior lending officers as to the
      ability of the borrowers to continue in business and to meet the repayment
      terms of the loans.  Installment loans are evaluated on the basis of
      underlying collateral and the ability of the borrowers to make scheduled
      payments.  The ongoing credit control process includes a risk rating
      system, combined with the development and monitoring of credit policies
      and procedures, as well as a loan review process.  The loan approval
      process is tied to the risk rating system and is subject to management's
      and the board's established guidelines on diversification.  On a quarterly
      basis, management employs an independent credit consultant whose sole
      purpose is to evaluate the loan portfolio with special emphasis on new
      credits and potentially troubled loans.

           Loans on which the borrowers fail to perform under the original terms
      of the obligation are considered nonperforming loans.  Nonperforming loans
      fall into two categories:  loans past due 90 days or more and still
      accruing interest and loans on nonaccrual status.  Loans on which
      principal or interest has been in default for a period of 90 days or
      longer must be well secured and in the process of collection, or they will
      be placed on nonaccrual status.  Loans are placed on nonaccrual status
      when it has been determined by management that there is reasonable doubt
      as to the collectibility of interest or principal.  When loans are placed
      on nonaccrual status, accrued and unpaid interest is reversed from
      earnings.

           The following table presents data regarding CapitolBank's loans more
      than 90 days past due and still accruing interest, nonaccrual loans, total
      nonperforming loans and total nonperforming assets, which includes
      nonperforming loans and other real estate owned ("OREO").

<TABLE>
<CAPTION>
 
                                     September 30,          December 31,
                                     --------------  --------------------------
                                          1994          1993          1992
                                     --------------  -----------  -------------
      <S>                               <C>          <C>            <C>
      Loans Past Due 90 Days or
       More and Still Accruing
       Interest....................     $        0   $1,151,570     $  160,000
      Nonaccrual Loans.............      2,164,542      138,129      2,449,000
                                        ----------   ----------     ----------
      Total Nonperforming Loans....      2,164,542    1,289,699      2,609,000
      OREO.........................        102,638       70,000        962,862
                                        ----------   ----------     ----------
      Total Nonperforming Assets...     $2,267,180   $1,359,699     $3,571,862
                                        ==========   ==========     ==========
      Nonperforming Assets as a
       Percentage of Loans and OREO           2.51%        1.77%          5.43%
      Nonperforming Assets as a
       Percentage of Total Assets..           1.64         1.10           2.98
</TABLE>

           The increase in nonaccrual loans from December 31, 1993 to September
      30, 1994 is primarily due to one real estate loan of approximately
      $1,000,000.  That loan has a low loan to value ratio and full repayment is
      expected.

           Loan reviews are performed using grading criteria similar to those
      used by bank regulatory agencies.  Loans receiving lesser grades are
      called "classified assets," which include all potential problem loans
      where known information about possible credit problems of borrowers causes
      management to have serious doubts as to the ability of such borrowers to
      comply with the present loan repayment terms and which may become
      nonperforming assets.

           Other than as disclosed in the table below, at September 30, 1994,
      management was not aware of any other material credits about which there
      was serious doubt regarding the ability of the borrower to repay according
      to the terms of the loan.  The following table sets forth data regarding
      classified loans.

           Total loans classified for regulatory purposes as loss, doubtful or
      substandard on the dates indicated were as follows:

                                      -75-
<PAGE>
 
<TABLE>
<CAPTION>
 
                                   September 30,             December 31, 
                             ------------------------  ------------------------
                                1994         1993         1993         1992
                             -----------  -----------  -----------  -----------
      <S>                    <C>          <C>          <C>          <C>
 
      Substandard..........  $3,250,976   $3,554,775   $4,115,060   $4,004,599
      Doubtful.............      34,494            0            0            0
      Loss.................           0            0            0            0
                             ----------   ----------   ----------   ----------
      Total Loans
       Classified..........  $3,285,470   $3,554,775   $4,115,060   $4,004,599
                             ==========   ==========   ==========   ==========
      Classified Loans as
       a Percentage
        of Total Loans.....        3.69%        4.64%        5.36%        6.18%
</TABLE>

           In May 1993, the Financial Accounting Standards Board ("FASB") issued
      Statement No. 114, Accounting by Creditors for Impairment of a Loan ("SFAS
      114"), which addresses the accounting treatment of certain impaired loans
      and amends FASB Statements No. 5 and No. 15. SFAS 114 does not address the
      overall adequacy of the allowance for loan losses.  SFAS 114 is effective
      January 1, 1995 but earlier implementation is encouraged. A loan is
      considered impaired when, based on current information and events, it is
      probable that a creditor will be unable to collect all amounts due
      according to the contractual terms of the loan agreement.  Under SFAS 114,
      impairment is measured based on the present value of the expected future
      cash flows discounted at the loan's effective interest rate.
      Alternatively, impairment may be measured by using the loan's observable
      market price or the fair value of the collateral if repayment is expected
      to be provided solely by the underlying collateral.

           CapitolBank intends to implement SFAS 114 on January 1, 1995.
      Management of CapitolBank believes that the impact of implementation of
      SFAS 114 on CapitolBank's financial statements will be insignificant.

           An analysis of the changes in the allowance for loan losses,
      including chargeoffs and recoveries stated by loan categories, is
      presented below.

<TABLE>
<CAPTION>
                                              Nine Months
                                                 Ended
                                              September 30,             December 31,
                                             ----------------  ---------------------------------
                                              1994     1993     1992     1991      1990    1989
                                             -------  -------  -------  -------  ------   ------
                                                                  (In thousands) 
      <S>                                    <C>      <C>      <C>      <C>      <C>      <C>
      Balance at beginning of period.......  $1,406   $1,170   $1,123   $1,161   $  801   $ 982
      Chargeoffs:                                                                
        Real estate construction...........       0        0        0        0        0       0
        Real estate mortgage...............       3      136        0      388      280     211
        Commercial and agricultural........      12      225      675      761        0     361
        Consumer installment...............       0        0        5        0        0       0
        Other..............................       0        0        0        0        0       0
                                             ------   ------   ------   ------   ------   -----
      Total loans charged off..............  $   15   $  361   $  680   $1,149   $  280   $ 572
                                                                                 
      Recoveries:                                                                
        Real estate construction...........  $    0   $    0   $    0   $    0   $    0   $   0
        Real estate mortgage...............       3        5        1        4       26     137
        Commercial and agricultural........     133      156      206       40       89       4
        Consumer installment...............       0        0        0        0        0       0
        Other..............................       0        0        0        0        0       0
                                             ------   ------   ------   ------   ------   -----
      Total loan recoveries................  $  136   $  161   $  207   $   44   $  115   $ 141
                                             ------   ------   ------   ------   ------   -----
                                                                                 
      Net charge-offs......................  $ (121)  $  200   $  473   $1,105   $  165   $ 431  
                                                                                 
      Allowance before provision                                                 
        for loan losses....................  $1,527   $  970   $  650   $   56   $  636   $ 551
      Provision charged to operations......     285      436      520    1,067      525     250
                                             ------   ------   ------   ------   ------   -----
      Balance end of period................  $1,812   $1,406   $1,170   $1,123   $1,161   $ 801
                                             ======   ======   ======   ======   ======   =====
      Ratio of allowance before provision                                        
        to average loans outstanding.......    1.91%    1.39%    0.98%    0.07%    0.87%   0.85%
      Ratio of net charge-offs to                                                
        average loans outstanding..........   (0.15)    0.29     0.72     1.46     0.23    0.66
      Allowance for possible loan                                                
        losses to total loans..............    2.01     1.83     1.80     1.61     1.42    1.29
</TABLE>

                                      -76-
<PAGE>
 
           The following table sets forth certain information regarding
      CapitolBank's allocation of the allowance for loan losses.

<TABLE>
<CAPTION>
                                      Nine Months                                                  
                                        Ended                                                      
                                     September 30,                                     December 31,
                                 ----------------------  ----------------------------------------------------------------------
                                         1994                    1993                     1992                    1991 
                                 ----------------------  ----------------------  ----------------------  ----------------------
                                                                         (In thousands)
                                            Percentage              Percentage              Percentage              Percentage
                                              of Loan                 of Loan                 of Loan                 of Loan
                                             Category                Category                Category                Category
                                            Outstanding             Outstanding             Outstanding             Outstanding
                                             to Total                to Total                to Total                to Total
                                 Allowance     Loans     Allowance     Loans     Allowance     Loans     Allowance     Loans
                                 ---------  -----------  ---------  -----------  ---------  -----------  ---------  -----------
<S>                                <C>         <C>        <C>          <C>         <C>         <C>         <C>         <C>
Real estate construction.....      $   562      31%        $   394      28%        $   222      19%        $   348      31%
Real estate mortgage.........          725      40             562      40             491      42             326      29
Commercial and
 agricultural................          471      26             394      28             386      33             371      33
Consumer installment.........           36       2              42       3              59       5              67       6
Other........................           18       1              14       1              12       1              11       1
                                   -------     ----        -------     ----        -------     ----        -------     ----
Total Reserves...............      $ 1,812     100%        $ 1,406     100%        $ 1,170     100%        $ 1,123     100%
                                   =======     ====        =======     ====        =======     ====        =======     ====
</TABLE>

      Investment in Real Estate Joint Venture

           During 1992, CapitolBank elected to divest itself of a real estate
      joint venture project initiated in 1990 through its wholly-owned
      subsidiary, Capitol Commerce Development Company VI.  Funding of this
      development project had been capitalized and included in other assets in
      prior periods on CapitolBank's Consolidated Balance Sheet. The expense
      associated with the elimination of this investment was charged to
      noninterest expense during the year ended December 31, 1992.  There is no
      financial statement impact of this investment in 1993 or 1994.


      Other Real Estate Owned

           Other real estate includes real estate acquired in full or partial
      settlement of loan obligations.  When property is acquired, any excess of
      CapitolBank's recorded investment in the loan balance and accrued interest
      income over the estimated fair market value of the property is charged
      against the allowance for loan losses.  Thereafter, it is carried at the
      lower of cost or fair value minus estimated selling costs.  Fair value is
      generally determined based upon periodic independent third party
      appraisals.  Subsequent gains or losses on sales or writedowns are
      recorded in other income or expense as incurred.

           Other real estate owned at September 30, 1994 consisted of three
      properties foreclosed upon during 1994.


      Commitments and Letters of Credit

           CapitolBank is a party to financial instruments with off-balance-
      sheet risk in the normal course of business to meet the financing needs of
      its customers.  These financial instruments include commitments to extend
      credit in the form of loans or through standby letters of credit, and
      involve, to varying degrees, elements of credit and interest rate risk in
      excess of the amount recognized in the balance sheet.

           CapitolBank's exposure to credit loss in the event of nonperformance
      by the other party to the financial instrument for commitments to extend
      credit and standby letters of credit is represented by the contractual
      amounts of those instruments.  CapitolBank uses the same credit policies
      in making commitments and conditional obligations as it does for on-
      balance-sheet instruments.

           Financial instruments whose contract amounts represent credit risk at
      September 30, 1994 were as follows:

                                      -77-
<PAGE>
 
<TABLE>
<CAPTION>
                                                               Value
                                                            -----------
      <S>                                                   <C>
      Undisbursed loan commitments........................  $28,558,000
      Reserve lines.......................................    1,060,000
      Letters of credit...................................      767,000
                                                            -----------
       Total..............................................  $30,385,000
                                                            ===========
</TABLE>

           Commitments to extend credit are agreements to lend to a customer as
      long as there is no violation of any condition established in the
      contract.  Commitments generally have fixed expiration dates or other
      termination clauses and may require payment of a fee.  Since many of the
      commitments are expected to expire without being drawn upon, the total
      commitment amounts do not necessarily represent future cash requirements.
      CapitolBank evaluates each customer's creditworthiness on a case-by-case
      basis.  The amount of collateral obtained, if deemed necessary by
      CapitolBank upon extension of credit, is based on management's credit
      evaluation.

           Standby letters of credit are conditional commitments issued by
      CapitolBank to guarantee the performance of a customer to a third party.
      The credit risk involved in issuing letters of credit is essentially the
      same as that involved in extending loan facilities to customers.


      Liquidity

           The objective of liquidity management is to maintain sufficient cash
      flow to satisfy both changes in loan demand and deposit fluctuations while
      maximizing the yield available from the instruments being used.  Liquidity
      is managed from both the asset and liability sides of the balance sheet.
      Liquid assets consist of cash and due from banks, interest bearing
      deposits in other financial institutions, federal funds sold, securities
      and maturing loans.  On the liability side of the balance sheet, liquidity
      is provided by core deposits, lines of credit, borrowings in the capital
      markets and other liabilities.

           CapitolBank's management monitors the liquidity position continuously
      and projects it based on the trends of loans and deposits.  Management
      attempts to adjust maturity distribution and interest rate sensitivity in
      response to these changes.

           CapitolBank has available a $3 million short-term Federal funds
      borrowing line with a major bank to meet short-term liquidity requirements
      should the need arise.

           Cash and cash equivalents equaled $29,995,000 at September 30, 1994
      and $11,276,000 at December 31, 1993.  Investment securities equaled
      $17,605,000 at September 30, 1994 and $34,342,000 at December 31, 1993.
      The net increase at September 30, 1994 of cash, cash equivalents and
      investment securities is equal to $1,982,000.  Deposits increased from
      $111,063,000 at December 31, 1993 to $126,025,000 at September 30, 1994.
      This funding source has been offset by the increase in outstanding loans 
      from $76,748,000 at December 1993 to $90,200,000 at September 30, 1994.
      Loan fundings increased by $14,292,000 for the nine months ended 
      September 30, 1994.


      Interest Rate Sensitivity

           The operating income and net income of CapitolBank depend to a
      substantial extent on "rate differentials," i.e., the difference between
      the income CapitolBank receives from loans, securities and other earning
      assets, and the interest expense it has on deposits and other liabilities.

           The interest rate sensitivity is measured over time and is based on
      CapitolBank's ability to reprice its assets and liabilities.  The
      opportunity to reprice assets in the same dollar amounts and at the same
      time as liabilities tends to minimize interest rate risk in any interest
      rate environment.  The difference between the amount of assets and
      liabilities repriced at the same time is referred to as the "gap."  This
      represents the risk, or opportunity, in repricing.  Fluctuation in
      interest rates in the market place exposes banks to potential gains and
      losses.  These market fluctuations have a two-fold effect upon banks:
      they influence the direction of future net 

                                      -78-
<PAGE>
 
      interest income either upward or downward and they determine the market
      value of CapitolBank's portfolio of rate sensitive assets and liabilities
      in a reciprocal direction. Because of the possible influence of
      unpredictable and uncontrollable external forces, management and the Board
      of Directors of CapitolBank have established limits of interest rate risk
      deemed acceptable and measure the current exposure against those limits.
      At September 30, 1994, management believed that CapitolBank's exposure to
      interest rate risk was within established limits.

           The asset/liability management process relies upon a periodic, in-
      depth analysis of balance sheet dynamics. The interest sensitivity
      analysis shown below provides a simplified representation of the exposure
      at September 30, 1994.

           The following table presents the interest rate sensitivity of
      CapitolBank's assets and liabilities at September 30, 1994:

<TABLE>
<CAPTION>
                                                                      Amounts Repriceable
                                                      ----------------------------------------------------
                                                                1 Day to 3   3 to 12    1 to 5    After 5
                                                       1 Day      Months     Months     Years      Years
                                                      --------   ---------  ---------  --------  ---------
                                                                         (In thousands)
<S>                                                   <C>        <C>        <C>        <C>        <C>
 
Interest earning assets
 Loans..................................              $ 81,372   $    510   $    859   $  2,863   $  2,432
 Securities.............................                21,500          0      3,510     13,337        985
                                                      --------   --------   --------   --------   --------
Total interest earning assets...........              $102,872   $    510   $  4,369   $ 16,200   $  3,417
                                                      ========   ========   ========   ========   ========
Interest bearing liabilities                                                                       
 Interest bearing checking accounts.....              $ 74,336   $      0   $      0   $      0   $      0
 Savings accounts.......................                 4,539          0          0          0          0
 Time deposits..........................                     0      8,076      6,366      1,558          3
                                                      --------   --------   --------   --------   --------
Total interest bearing liabilities......              $ 78,875   $  8,076   $  6,366   $  1,558   $      3
                                                      ========   ========   ========   ========   ========
Interest sensitivity gap per period.....              $ 23,997   $ (7,566)  $ (1,997)  $ 14,642   $  3,414
Cumulative interest sensitivity gap.....                23,997     16,431     14,434     29,076     32,490
Cumulative interest sensitivity                                                                    
 gap as a percentage of total                                                                      
 interest earning assets................                18.84%      12.90%     11.33%     22.83%     25.51%
Cumulative ratio of interest sensitive                                                             
 assets to interest sensitive                                                                      
 liabilities............................                 1.30        1.19       1.15       1.31       1.34

</TABLE>

           Floating rate loans are shown as maturing at the earliest repricing
      date.  Interest bearing checking accounts and savings accounts are shown
      as maturing immediately.  Noninterest bearing checking accounts, which are
      considered core deposits, tend not to be sensitive to changes in interest
      rates and are not included.  All other categories are repriced by maturity
      date.  Since the majority of CapitolBank's loans are priced on a floating
      rate basis, the current rising interest rate environment is expected to
      continue to have a positive effect on interest income.


      Capital

           The Federal Reserve Board, the Office of Comptroller of the Currency
      and FDIC have adopted guidelines designed to make capital requirements
      more sensitive to differences in risk among banking organizations,
      including off-balance-sheet exposures, and to make the definition of bank
      capital more uniform internationally.  Under these risk-based capital
      guidelines, a financial institution is required to maintain Tier I capital
      equal to at least 8% of its assets, weighted by risk.  Additionally, to be
      considered well capitalized, a financial institution must maintain total
      capital equal to at least 10% of risk adjusted assets.

           As of December 31, 1993 and 1992, CapitolBank's Tier I total risk-
      based capital ratio was 11.65% and 13.33%, respectively, and its total
      risk-based capital ratio was 12.9% and 14.58%, respectively. As of
      September 30, 1994, CapitolBank's Tier I total risk-based capital ratio
      was 9.78% and its total risk-based capital ratio was 11.04%.

                                      -79-
<PAGE>
 
      Investment Securities

           Investment securities available for sale are carried at estimated
      fair value with unrealized gains and losses reported as a separate
      component of shareholders' equity.  Investment securities held to maturity
      are carried at cost, adjusted for amortization of premium and accretion of
      discount.  Premiums and discounts are amortized and accreted using the
      interest method.  Gains or losses on the sale of securities are determined
      on the specific identification method and are shown separately in the
      consolidated statements of operations.  No allowance for market decline,
      if any, is provided as interest is current on the investment portfolio and
      management intends and has the ability to hold these investments until
      maturity.  Summary yield and maturity information regarding CapitolBank's
      investment securities available-for-sale and investment securities held-
      to-maturity portfolios at September 30, 1994 are set forth in the
      following table:

<TABLE>
<CAPTION>
 
                                                                            Maturing
                                 ----------------------------------------------------------------------------------------------- 
                                                             After 1 Year but       After 5 Years but
                                      Within 1 Year           Within 5 Years         Within 10 Years        After 10  Years
                                 -----------------------  ----------------------  ----------------------  ----------------------
                                   Amount       Yield       Amount      Yield       Amount      Yield      Amount       Yield
                                 ----------   ----------  ----------  ----------  ----------  ----------  ----------  ----------
<S>                              <C>          <C>         <C>         <C>        <C>          <C>         <C>          <C>
Securities Available-for-Sale:
  U.S. Government Agencies.....  $2,991,560       5.32%   $8,853,720      5.72%   $        0         0%    $       0           0%
  Repurchase Agreements........           0          0             0         0             0         0             0           0
  Mutual Funds.................           0          0             0         0             0         0             0           0
                                 ----------   ----------  ----------  ----------  ----------  ----------  ----------  ----------
   Estimated Fair Value........  $2,991,560       5.32%   $8,853,720      5.72%
                                 ==========   ==========  ==========  ==========  ==========  ==========  ==========  ==========

Securities Held-to-Maturity:
  U.S. Treasury................           0          0       997,638      5.19%            0         0             0           0
  U.S. Government Agencies.....     505,513       5.39%    3,022,426      5.78       984,778      5.68%            0           0
  Other........................     250,000       5.50             0         0             0         0             0           0
                                 ----------   ----------  ----------  ----------  ----------  ----------  ----------  ----------
   Carrying Value..............     755,513       5.44%    4,020,064      5.63%      984,778      5.68%            0           0
                                 ==========   ==========  ==========  ==========  ==========  ==========  ==========  ==========
   Estimated Fair Value........     745,787                3,687,510                 895,800                       0
                                 ==========               ==========              ==========              ==========
</TABLE>
    Prior to January 1, 1994, CapitolBank classified securities as securities
held for sale or held for investment securities. Investment securities were
recorded at amortized cost.

    The following table sets forth the carrying values and fair values of 
securities at December 31, 1993:

<TABLE>
<CAPTION>
 
                                    December 31, 1993
                                    -----------------
<S>                                 <C>
 
Securities:
  U.S. Treasury Securities........   $     25,162,828
  U.S. Government Agencies........          3,033,800
  Other Securities................          6,145,668
                                     ----------------
      Carrying Value..............   $     34,342,296
                                     ================
      Fair Value..................   $     35,217,000
                                     ================
</TABLE>


     The following table sets forth the carrying values and fair values of
securities at December 31, 1992:

<TABLE>
<CAPTION>
 
                                    December 31, 1992
                                    -----------------
<S>                                 <C>
 
Securities
  U.S. Treasury Securities........  $      27,325,384
  U.S. Government Agencies........          4,031,063
  Other Securities................          2,832,351
                                    -----------------
     Carrying Value...............  $      34,188,798
                                    =================
     Fair Value...................  $      35,146,000
                                    =================
</TABLE>

                                      -80-
<PAGE>
 
     Gross gains realized on sales of investment securities totaled $283,998, 
$305,560 and $449,543 in 1993, 1992 and 1991, respectively.  Gross losses of 
$1,269, $36,941 and $849 were realized on sales of investment securities in 
1993, 1992 and 1991, respectively.

     The book value of securities pledged to secure public deposits totaled 
$12,416,000 and $11,438,000 at December 31, 1993 and 1992, respectively.


Deposits

     The following table sets forth, by time remaining to maturity, 
CapitolBank's domestic time deposits in amounts of $100,000 or more.

<TABLE>
<CAPTION>
                                                       September 30,
                                                          1994
                                                      --------------
                                                      (In thousands)
<S>                                                  <C>
                                                 
Time remaining to maturity                       
 3 months or less...............................       $      5,044
 Over 3 through 12 months.......................              3,247
 Over 12 months.................................                405
                                                       ------------
   Total........................................       $      8,696
                                                       ============
</TABLE>

Selected Ratios

     The following table sets forth CapitolBank's return on average assets
and average equity, as well as CapitolBank's dividend payout ratio.

<TABLE>
<CAPTION>
 
 
                                             Nine Months
                                          Ended September 30,                  Year Ended December 31,
                                          --------------------       ---------------------------------------
                                            1994        1993           1993           1992            1991
                                          --------    --------       --------       --------        -------- 
<S>                                      <C>        <C>              <C>          <C>               <C>
Return on average assets..............      0.20%       0.23%           0.26%        (1.50)%           0.16%
Return on average equity..............      3.03        2.11            3.57        (21.66)            1.95
Dividend payout ratio.................         0           0               0             0                0
 
</TABLE>

                 CERTAIN DIFFERENCES IN RIGHTS OF SHAREHOLDERS

General

     Westamerica is incorporated under and subject to all of the provisions of 
the GCL.  CapitolBank is incorporated under and subject to all of the 
provisions of the California Financial Code (the "Financial Code") and the GCL.

     Upon consummation of the Merger, except for those persons, if any, who 
perfect dissenters' rights under the GCL (see "Dissenters' Rights of 
Appraisal"), the shareholders of CapitolBank will become shareholders of 
Westamerica.

     Westamerica and Westamerica Bank are California corporations and, 
accordingly, are governed by the GCL and by their respective Articles of
Incorporation (the "Westamerica Articles" and "Westamerica Bank Articles,"
respectively) and Bylaws (the "Westamerica Bylaws" and "Westamerica Bank
Bylaws," respectively). CapitolBank's Articles of Incorporation (the
"CapitolBank Articles") and Bylaws (the "CapitolBank Bylaws") differ in certain
material respects from the Westamerica Articles, Westamerica Bylaws, Westamerica
Bank Articles and 

                                      -81-
<PAGE>
 
Westamerica Bank Bylaws. In addition, unlike CapitolBank Common Stock, each 
outstanding share of Westamerica Common Stock is accompanied by Rights. See 
"Description of Westamerica Capital Stock and Indebtedness--Shareholder Rights 
Plan."

     The following is a general comparison of certain similarities and material
differences between the rights of Westamerica shareholders and the rights of
CapitolBank shareholders under their respective Articles of Incorporation and
Bylaws. This discussion is only a summary of certain provisions and does not
purport to be a complete description of such similarities and differences, and
is qualified in its entirety by reference to the GCL, the Financial Code, the
common law thereunder and the full text of the Westamerica Articles, Westamerica
Bylaws, Westamerica Bank Articles, Westamerica Bank Bylaws, CapitolBank Articles
and CapitolBank Bylaws.

     Some of the provisions in the Westamerica Articles and the Westamerica 
Bylaws discussed below may deter efforts to obtain control of Westamerica on a
basis which some shareholders might deem favorable. Such provisions are designed
to encourage any person attempting a change in control of Westamerica to enter
into negotiations with the Westamerica Board of Directors.


Quorum Requirements

     The Westamerica Bylaws provide that the presence in person or by proxy of
the holders of one-third of the shares entitled to vote at any meeting of the
shareholders shall constitute a quorum for the transaction of business. The
CapitolBank Bylaws require the presence in person or by proxy of the holders of
a majority of the shares entitled to vote for a quorum to exist.


Indemnification of Directors and Executive Officers

     Section 317 of the GCL ("Section 317") expressly grants to each 
California corporation the power to indemnify its directors, officers and agents
against certain liabilities and expenses incurred in the performance of their
duties. Rights to indemnification beyond those provided by Section 317 may be
valid to the extent that such rights are authorized in the corporation's
articles of incorporation. Indemnification may not be made, however, with
respect to liability incurred in connection with any of the following acts for
which the liability of directors may not be limited under case law interpreting
the GCL: (i) acts or omissions that involve intentional misconduct or a knowing
and culpable violation of law; (ii) acts or omissions that a director believes
to be contrary to the best interests of the corporation or its shareholders or
that involve the absence of good faith on the part of the director; (iii) any
transaction from which a director derived a personal benefit; (iv) acts or
omissions that show a reckless disregard for the director's duty to the
corporation or its shareholders in circumstances in which the director was
aware, or should have been aware, in the ordinary course of performing a
director's duties, of a risk of serious injury to the corporation or its
shareholders; (v) acts or omissions that constitute an unexcused pattern of
inattention that amounts to an abdication of the director's duty to the
corporation or its shareholders; (vi) acts or omissions arising out of certain
interested party transactions; or (vii) acts in connection with illegal
distributions, loans or guarantees.

     With respect to all proceedings other than shareholder derivative actions,
Section 317 permits a California corporation to indemnify any of its directors,
officers or other agents only if such person acted in good faith and in a manner
such person reasonably believed to be in the best interests of the corporation
and, in the case of a criminal proceeding, had no reasonable cause to believe
the conduct of such person was unlawful. In the case of derivative actions, a
California corporation may indemnify any of its directors, officers or agents
only if such person acted in good faith and in a manner such person believed to
be in the best interests of the corporation and its shareholders. Furthermore,
in derivative actions, no indemnification is permitted (i) with respect to any
matter with respect to which the person to be indemnified has been held liable
to the corporation, unless such indemnification is approved by the court; (ii)
of amounts paid in settling or otherwise disposing of a pending action without
court approval; or (iii) of expenses incurred in defending a pending action
which is settled or otherwise disposed of without court approval. To the extent
that a director, officer or agent of a corporation has been successful on the
merits in defense of any proceeding for which indemnification is permitted by
Section 317, a 

                                      -82-
<PAGE>
 
      corporation is obligated by Section 317 to indemnify such person against 
      expenses actually and reasonably incurred by him in connection with the 
      proceeding.

                The Westamerica Articles, Westamerica Bank Articles and
      CapitolBank Articles each eliminate the liability of their directors for
      monetary damages to the fullest extent permissible under California law
      and grant to Westamerica, Westamerica Bank and CapitolBank, respectively,
      the power to indemnify their directors, officers and agents through
      agreements with such persons or through bylaw provisions, or both, in
      excess of the indemnification otherwise permitted by Section 317, subject
      to applicable statutory prohibitions upon indemnification.

                The Westamerica Bylaws obligate Westamerica to indemnify its
      directors and provide that Westamerica has the right but not the
      obligation to indemnify its officers and other agents against liabilities
      and expenses incurred in the performance of their duties, subject to the
      prohibitions of the GCL.  The Westamerica Bank Bylaws and CapitolBank
      Bylaws obligate Westamerica Bank and CapitolBank, respectively, to
      indemnify their respective directors, officers and other agents against
      liabilities and expenses incurred in the performance of their duties,
      subject to the prohibitions of the GCL.

                Westamerica, Westamerica Bank and CapitolBank each maintain
      directors' and officers' liability insurance policies that indemnify their
      respective directors and officers against certain losses in connection
      with claims made against them for certain wrongful acts.  In addition,
      Westamerica, Westamerica Bank and CapitolBank each have entered into
      separate indemnification agreements with their respective directors and
      officers that require Westamerica, Westamerica Bank and CapitolBank,
      respectively, among other things, (i) to maintain directors' and officers'
      insurance in reasonable amounts in favor of such individuals; and (ii) to
      indemnify them against certain liabilities that may arise by reason of
      their status or service as agents of Westamerica, Westamerica Bank or
      CapitolBank, as the case may be, to the fullest extent permitted by
      California law.  See "Certain Considerations--Tyler v. Wickland."

                The Westamerica Bylaws, Westamerica Bank Bylaws and Westamerica
      and Westamerica Bank's respective indemnification agreements with their
      respective directors entitle the directors of Westamerica and Westamerica
      Bank to be indemnified against liabilities and reasonable expenses
      incurred in connection with any claims brought against them by reason of
      the fact that they are or were directors and are expressly stated to be
      contract rights.  Westamerica and Westamerica Bank directors have been
      granted the right to be paid by Westamerica and Westamerica Bank,
      respectively, the expenses incurred in defending the proceedings specified
      above in advance of their final disposition, but the agreements require
      the directors to undertake to return any amounts advanced to the extent
      that it is ultimately determined that they were not legally entitled to be
      indemnified by Westamerica and Westamerica Bank in the proceeding. The
      Westamerica Bylaws, Westamerica Bank Bylaws and Westamerica and
      Westamerica Bank's respective indemnification agreements both grant to the
      directors the right to bring suit against Westamerica and Westamerica
      Bank, respectively, to recover unpaid amounts claimed with respect to
      indemnification and any expenses incurred in bringing such an action. Both
      the Westamerica Bylaws, Westamerica Bank Bylaws and Westamerica and
      Westamerica Bank's respective indemnification agreements provide that,
      while it is a defense to such a suit that indemnification is prohibited by
      the GCL, the burden of proving such a defense is on Westamerica and
      Westamerica Bank, respectively.

                The Westamerica Bylaws, Westamerica Bank Bylaws and Westamerica
      and Westamerica's respective indemnification agreements obligate
      Westamerica and Westamerica Bank, respectively, to indemnify their
      respective directors except (i) where such indemnification is prohibited
      by law; (ii) with respect to settlements made by the directors without the
      prior approval of Westamerica and Westamerica Bank; and (iii) for any
      expenses or liabilities incurred in connection with proceedings brought by
      the directors against Westamerica and Westamerica Bank, other than actions
      brought to enforce its indemnification obligations.

                The CapitolBank Bylaws and indemnification agreements with the
      directors and officers entitle the directors and officers of CapitolBank
      to be indemnified against liabilities and expenses actually and reasonably
      incurred in connection with the defense or settlement of a claim brought
      against the directors or officers by reason of the fact that such person
      is or was a director or officer or is or was serving at the request of
      CapitolBank as an agent of another enterprise.  CapitolBank directors and
      officers have the right to be paid the expenses incurred in advance of the
      final disposition of such claim.  The indemnification agreements require,
      however, that the directors 

                                      -83-
<PAGE>
 
      and officers repay any advances if CapitolBank ultimately determines 
      under the terms of the indemnification agreements that the director or
      officer is not entitled to indemnification. Both the CapitolBank Bylaws
      and the indemnification agreements permit the directors and officers to
      bring suit against CapitolBank to recover the unpaid amount of the claim
      and, if successful, the expenses (including attorneys' fees) of bringing
      such action against CapitolBank. The CapitolBank Bylaws and the
      indemnification agreements provide that it shall be a defense to any such
      action that the director or officer has not met the standards of conduct
      which make it permissible under applicable law for CapitolBank to
      indemnify the director or officer for the amount claimed.

           The CapitolBank Bylaws and the indemnification agreements provide,
      among other things, that no indemnification shall be made to directors or
      officers (i) if such indemnification is unlawful; (ii) without
      CapitolBank's approval; (iii) if, in the instance of an action by or in
      the right of CapitolBank, the action was settled or otherwise disposed of
      without court approval; and (iv) if expenses and liabilities were incurred
      in connection with proceedings initiated or brought voluntarily by the
      directors or officers against CapitolBank, other than actions brought to
      enforce indemnification obligations.

           Federal law authorizes the FDIC to limit, by regulation or order, the
      payment of indemnification by insured banks or bank holding companies to
      their directors and officers. Pursuant to this authority, the FDIC has
      proposed a regulation that permits the payment of indemnification by banks
      and bank holding companies to institution-affiliated directors, officers
      and other parties only if certain requirements are satisfied. If adopted
      as presently written, this regulation would permit an institution to make
      an indemnification payment to, or for the benefit of, a director, officer
      or other party only if the institution's board of directors, in good
      faith, certifies that the individual has a substantial likelihood of
      prevailing on the merits and that the payment of indemnification will not
      adversely affect the institution's safety and soundness. Further, the
      board of directors must provide the FDIC and any other appropriate bank
      regulatory agency with prior written notice of any authorization of
      indemnification. In addition, indemnification payments (within the scope
      of the regulations) are limited to the payment or reimbursement of any
      liability or legal expense incurred in conjunction with the individual's
      involvement in an administrative proceeding or civil action instituted by
      any federal or state bank regulatory agency. Finally, the director,
      officer or other party must agree in writing to reimburse the institution
      for any indemnification payments received should the proceeding result in
      a final order being instituted against the individual assessing a civil
      money penalty, removing the individual from office, or requiring the
      individual to cease and desist from certain institutional activity.


           The drafters of the proposed regulation expressly state that the
      regulation is intended to apply to existing agreements between
      institutions and institution-affiliated parties to make indemnification
      payments in the future. If the proposed regulation is placed into effect,
      therefore, it may be applied retroactively to indemnification agreements
      presently existing between Westamerica, Westamerica Bank and CapitolBank
      and their respective directors and officers.


      Shareholder Meetings and Action by Written Consent

           The Westamerica Bylaws and the CapitolBank Bylaws are similar in
      their requirements for shareholder action by written consent, including
      the requirement for unanimous written consent for election of directors.
      The Westamerica Bylaws permit a director to be elected at any time to fill
      a vacancy on the board of directors that has not been filled by the
      directors by the written consent of the holders of a majority of the
      outstanding shares entitled to vote for the election of directors. The
      CapitolBank Bylaws have a similar provision except that an election by
      written consent to fill a vacancy created by removal of a director
      requires the unanimous written consent of the outstanding shares entitled
      to vote.


      Amendment of Bylaws

           Both the Westamerica Bylaws and the CapitolBank Bylaws may be amended
      or repealed by the affirmative vote or written consent of a majority of
      the outstanding shares entitled to vote. The Westamerica Bylaws require
      that if the Westamerica Articles set forth the number of authorized
      directors of Westamerica, the authorized number

                                      -84-
<PAGE>
 
      of directors may be changed only by an amendment of the articles of
      incorporation. The CapitolBank Bylaws allow for the change in the number
      of directors by the affirmative vote or written consent of a majority of
      the outstanding shares entitled to vote.

           Subject to the rights of shareholders to amend the bylaws, both the
      Westamerica Bylaws and the CapitolBank Bylaws provide that the bylaws may
      be adopted, amended or repealed by their respective Boards of Directors.


      Meetings Called by the Superintendent

           The Superintendent may call a meeting of the CapitolBank Board of
      Directors pursuant to section 684 of the Financial Code. A meeting of the
      CapitolBank Board of Directors called by the Superintendent shall be held
      upon four days notice by mail or 24 hours notice delivered personally or
      by telephone or telegraph. Such notice shall be given by the
      Superintendent or, if the Superintendent so orders, by an officer of the
      corporation. A meeting of the CapitolBank Board of Directors called by the
      Superintendent shall be held at such place within California as may be
      designated by the Superintendent and specified in the notice of such
      meeting.

           The expenses of a meeting of the Board of Directors called by the
      Superintendent shall be paid by CapitolBank.


      Filling Vacancies on the Board of Directors

           The Westamerica Bylaws provide that vacancies occurring on the
      Westamerica Board of Directors may be filled by a vote of a majority of
      the remaining directors, though less than a quorum, or by a sole remaining
      director, except that a vacancy created by the removal of a director by
      the shareholders or by court order may only be filled by the vote of a
      majority of the shares entitled to vote represented at a duly held meeting
      or by written consent of a majority of the outstanding shares entitled to
      vote. The Westamerica Bylaws also provide that the shareholders may elect
      a director at any time to fill any vacancy not filled by the directors,
      except that any election by written consent, other than to fill a vacancy
      created by removal of a director, requires the consent of a majority of
      the outstanding shares entitled to vote. In addition, the GCL provides
      that if, after the filling of any vacancy by the directors, the directors
      then in office who have been elected by the shareholders constitute less
      than a majority of the directors then in office, (i) any holder or holders
      of an aggregate of 5% or more of the total number of shares at the time
      outstanding having the right to vote for such directors may call a special
      meeting of shareholders; or (ii) the California Superior Court of the
      proper county shall, upon application of such shareholder or shareholders,
      summarily order a special meeting of shareholders, to be held to elect the
      entire Board of Directors.

           Except for a vacancy created by the removal of a director which may
      only be filled by approval of the shareholders, the CapitolBank Bylaws
      provide that vacancies on the board of directors may be filled by approval
      of the board of directors or, if the number of directors then in office is
      less than a quorum, by the unanimous written consent of the directors then
      in office, the affirmative vote of a majority of the remaining directors
      then in office, or by a sole remaining director. Each director so elected
      shall hold office until his successor is elected at an annual or special
      shareholders' meeting. The CapitolBank shareholders may elect a director
      at any time to fill any vacancy not filled by the directors. Any such
      election by written consent, other than to fill a vacancy created by
      removal, requires the consent of a majority of the outstanding shares
      entitled to vote. An election by written consent to fill a vacancy created
      by removal requires the unanimous consent of all shareholders entitled to
      vote.


      Notice of Shareholder Business

           Under the Westamerica Bylaws, a shareholder must give 14 to 50 days
      prior notice to Westamerica's Corporate Secretary of any business the
      shareholder wishes to bring before an annual meeting of shareholders,

                                      -85-
<PAGE>
 
      except that if less than 21 days notice of the date of the meeting is
      given to shareholders, a shareholder must provide notice to Westamerica
      within seven days of the date Westamerica mailed notice of the annual
      meeting.  The notice must contain a brief description of the business that
      the shareholder wishes to bring before the meeting, the reasons for
      conducting such business at the meeting, the name and residential address
      of the proposing shareholder, the number of shares the shareholder owns
      and any material interest of the shareholder in the business that the
      shareholder wishes to bring before the meeting.

           No comparable restrictions upon the right of CapitolBank shareholders
      to bring matters before the annual meeting of shareholders are contained
      in the CapitolBank Bylaws.


      Notice of Director Nominations

           Under the Westamerica Bylaws, a shareholder must give 14 to 50 days
      prior notice to Westamerica's Corporate Secretary if the shareholder
      wishes to nominate any person for election as a Westamerica director at
      any meeting called for the election of directors, except that if less than
      21 days notice of the meeting is given to shareholders, a shareholder must
      provide notice to Westamerica within seven days of the date Westamerica
      mailed notice of the meeting. The notice of the shareholder to nominate
      must contain the following information: the name and address of each
      proposed nominee; the principal occupation of each proposed nominee; the
      total number of shares of stock of Westamerica that the shareholder
      expects will be voted for each proposed nominee; the name and residence
      address of the shareholder; and the number of shares of stock of
      Westamerica owned by the shareholder.

           Under the CapitolBank Bylaws, a shareholder must give 21 to 60 days
      prior written notice delivered or mailed to the President of CapitolBank
      if the shareholder wishes to nominate any person for election as a
      CapitolBank director at any shareholders' meeting called for the election
      of directors, except that if less than 21 days notice of the meeting is
      given to shareholders, a shareholder must provide notice to CapitolBank's
      President within 10 days of the date CapitolBank mailed the notice of the
      meeting, and if notice of the meeting is sent to shareholders via third-
      class mail, no notice of intention to make nominations is required of the
      shareholders. The notice of the shareholder to nominate must contain the
      following information: the name and address of each proposed nominee; the
      principal occupation of each proposed nominee; the number of shares of
      capital stock of CapitolBank owned by each proposed nominee; the name and
      residence address of the notifying shareholder; and the number of shares
      of capital stock of CapitolBank owned by the notifying shareholder.


      Westamerica "Interested Person" Provision

           The Westamerica Articles contain an "interested person" provision
      which applies to transactions with persons or entities holding 10% or more
      of the outstanding shares of Westamerica Common Stock (an "Interested
      Person"). Subject to certain exceptions, the Interested Person provision
      requires that the affirmative vote of 80% of the outstanding shares of
      Westamerica Common Stock is required to authorize any of the following
      transactions with an Interested Person: (i) a merger or consolidation;
      (ii) the sale or disposition of all or a substantial part of Westamerica's
      assets to an Interested Person; (iii) the purchase or other acquisition by
      Westamerica of all or a substantial part of the assets of an Interested
      Person; or (iv) any other transaction with an Interested Person which
      requires the approval of the Westamerica shareholders pursuant to the GCL.

           The special approval requirements of the Interested Person provision
      do not apply if the transaction in question was (i) approved by the
      Westamerica Board of Directors before the other person or entity involved
      became an Interested Person; or (ii) approved by a majority of the
      Westamerica Board of Directors while the other person or entity was an
      Interested Person and the consideration to be received by Westamerica
      shareholders is not less per share than the highest price per share
      (including brokerage commissions and/or dealer fees) paid by the
      Interested Person for any shares of Westamerica stock from the time the
      Interested Person obtained beneficial ownership in excess of 5% of the
      outstanding shares of Westamerica Common Stock. This Interested Person
      provision may have the effect of deterring efforts to change control of
      Westamerica on a basis which some shareholders may deem favorable.

                                      -86-
<PAGE>
 
           The CapitolBank Articles do not contain an "interested person"
      provision or similar provision restricting the ability of any person to
      acquire control of CapitolBank.


           DESCRIPTION OF WESTAMERICA CAPITAL STOCK AND INDEBTEDNESS

           The authorized capital stock of Westamerica consists of 20,000,000
      shares of Common Stock, without par value, and 1,000,000 shares each of
      Class B Common Stock and Preferred Stock.  As of the Record Date,
      _________ shares of Westamerica Common Stock and no shares of either the
      Class B Common Stock or the Preferred Stock were outstanding and an
      additional _______ shares of the authorized Westamerica Common Stock were
      available for future grant and reserved for issuance to holders of
      outstanding stock options, stock appreciation rights and restricted
      performance shares under Westamerica's stock option plans.


      Common Stock

           Holders of Westamerica Common Stock are entitled to one vote for each
      share held of record on all matters submitted to a vote of shareholders,
      except that, upon giving the notice required by the Westamerica Bylaws,
      shareholders may cumulate their votes for the election of directors.
      Shareholders are entitled to receive ratably such dividends as may be
      legally declared by Westamerica's Board of Directors.  There are legal and
      regulatory restrictions on the ability of Westamerica to declare and pay
      dividends.  See "Market Price and Dividend Information--Dividends and
      Dividend Policy."  Westamerica is also subject to certain restrictions on
      its ability to pay dividends and the amount thereof under the terms of
      certain of its debt agreements.  See "--Debt Agreements." In the event of
      a liquidation, common shareholders are entitled to share ratably in all
      assets remaining after payment of liabilities and liquidation preferences
      for securities with a priority over the Westamerica Common Stock.
      Attached to each outstanding share of Westamerica Common Stock is a Right
      which entitles the holder to certain rights as set forth in the Amended
      and Restated Rights Agreement.  See "--Shareholder Rights Plan."
      Shareholders of Westamerica Common Stock have no preemptive or conversion
      rights.  Westamerica Common Stock is not subject to calls or assessments.
      The transfer agent and registrar for Westamerica Common Stock is Chemical
      Trust Company of California.


      Preferred Stock and Class B Common Stock

           The Westamerica Board of Directors is authorized to fix the rights,
      preferences, privileges and restrictions of the Preferred Stock and the
      Class B Common Stock and may establish series of such stock and determine
      the variations between series.  If and when any Preferred Stock is issued,
      the holders of Preferred Stock may have a preference over holders of
      Westamerica Common Stock upon the payment of dividends, upon liquidation
      of Westamerica, in respect of voting rights and in the redemption of the
      capital stock of Westamerica.  The Westamerica Articles provide that,
      except as otherwise provided by law or by the Westamerica Board of
      Directors, shares of Class B Common Stock shall have no voting rights.
      The issuance of any Preferred Stock or Class B Common Stock may have the
      effect of delaying, deferring or preventing a change in control of
      Westamerica without further action of its shareholders.  The issuance of
      such stock with voting and conversion rights may adversely affect the
      voting power of the holders of Westamerica Common Stock.  Westamerica has
      no present plans to issue any shares of Preferred Stock or Class B Common
      Stock.


      Debt Agreements

           Westamerica is a party to certain debt agreements containing
      restrictions on the payment of dividends and the amount thereof, as well
      as financial and other covenants, as described below.

           Westamerica entered into a Consolidated Note Agreement dated May 15,
      1984 (the "Consolidated Note Agreement") with certain institutional
      investors, pursuant to which one promissory note (the "Note") was
      outstanding with an aggregate principal amount of $1,100,000 as of
      September 30, 1994, which, among other 

                                      -87-
<PAGE>
 
      things, restricted Westamerica's ability to pay cash dividends.  In 
      October 1994, the Note was fully paid by Westamerica.

           Westamerica, as successor in interest to Napa Valley Bancorp, is
      party to that certain Note Purchase Agreement, dated as of May 25, 1988
      (the "NVBC Note Purchase Agreement"), with an institutional investor,
      pursuant to which Napa Valley Bancorp issued $5,000,000 aggregate
      principal amount of its 10.87% Senior Notes due June 30, 1995 (the "NVBC
      Notes").  As of September 30, 1994, the entire $5,000,000 aggregate
      principal amount of the NVBC Notes was outstanding.  The NVBC Note
      Purchase Agreement contains certain restrictions on, among other things,
      Westamerica's rights to (i) subject its property to liens; (ii) incur
      indebtedness; (iii) permit certain of its subsidiaries to incur
      indebtedness; (iv) enter into certain leases for real and personal
      property; (v) pay cash dividends on Westamerica Common Stock; and (vi)
      sell, lease, transfer or otherwise dispose of all or any part of its
      property if such transaction involves a substantial part of its property.
      In addition, the NVBC Note Purchase Agreement prohibits Westamerica from
      merging with any person unless the entity into which Westamerica is merged
      expressly assumes the due and punctual payment of the principal and
      interest on the NVBC Notes and certain additional conditions are
      satisfied.

           The Consolidated Note Agreement and the NVBC Note Purchase Agreement
      do not prohibit Westamerica from executing and delivering the Agreements
      or consummating the Merger.


      Shareholder Rights Plan

           On December 18, 1986, the Board of Directors of Westamerica adopted a
      "Shareholder Rights Plan" by declaring a dividend distribution of one
      Right for each outstanding share of Westamerica Common Stock, payable to
      shareholders of record on January 20, 1987 and future Westamerica Shares.
      The terms of the Rights were amended by the Westamerica Board of Directors
      on September 28, 1989. When exercisable, each Right entitles the holder to
      purchase from Westamerica one share of Westamerica Common Stock at a price
      of $65 per share (the "Exercise Price"), subject to adjustment in certain
      circumstances. The description and terms of the Rights are set forth in
      the Amended and Restated Rights Agreement. Pursuant to an Appointment and
      Acceptance Agreement effective May 25, 1992, Chemical Trust Company of
      California was substituted as the Rights Agent under the Amended and
      Restated Rights Agreement.

           Until a Distribution Date occurs, as described below, the Rights are
      not exercisable and remain attached to the shares of Westamerica Common
      Stock associated therewith.  The Rights will become exercisable and trade
      separately from the Westamerica Common Stock and a Distribution Date will
      occur on the tenth day (or such later date as a majority of the
      Westamerica Board of Directors may determine) following the earlier to
      occur of (i) a public announcement that an Acquiring Person has become the
      beneficial owner of securities having 15% or more of Westamerica's voting
      power; or (ii) 10 days (unless such date is extended by the Westamerica
      Board of Directors) following the commencement of, or a public
      announcement of an intention to make, a tender or exchange offer which
      would result in any Acquiring Person having beneficial ownership of
      securities having 15% or more of such voting power.

           Unless the Rights are earlier redeemed, in the event that a person or
      group of affiliated or associated persons becomes the beneficial owner of
      securities having 15% or more of the voting power of all then outstanding
      voting securities of Westamerica (unless pursuant to a tender or exchange
      offer for all outstanding shares of Westamerica Common Stock at a price
      and on terms determined by at least a majority of the members of the Board
      of Directors who are not officers of Westamerica to be in the best
      interests of Westamerica and its shareholders), then each holder of a
      Right (other than an Acquiring Person, whose rights will thereupon become
      null and void) will for at least a 60-day period thereafter have the right
      to receive upon exercise that number of shares of Westamerica Common Stock
      having a market value of twice the exercise price of the Right, to the
      extent available, and then (after all authorized and unreserved shares of
      Westamerica Common Stock have been issued). If a sufficient number of
      shares are not available, the holder will also receive a common stock
      equivalent (such as preferred stock or another equity security with at
      least the same economic value as the Westamerica Common Stock) which,
      together with the Westamerica Common Stock received, has an aggregate
      market value of twice the exercise price of the Right (the "Subscription
      Right").

                                      -88-
<PAGE>
 
           Unless the Rights are earlier redeemed, in the event that, after the
      first date of public announcement by Westamerica or an Acquiring Person
      that an Acquiring Person exists, (i) Westamerica is acquired in a merger
      or consolidation; (ii) any bank subsidiary of Westamerica is acquired in a
      merger or consolidation; or (iii) 50% or more of Westamerica's assets or
      earnings power are sold, then each holder of a Right (other than such
      Acquiring Person) will thereafter have the right to receive, upon exercise
      and payment of the exercise price of the Right, that number of shares of
      common stock of the surviving entity in the business combination, which at
      the time of such transaction would have a market value of at least two
      times the exercise price of the Right.

           At any time prior to a person becoming an Acquiring Person without
      Westamerica's consent, Westamerica may redeem the Rights in whole, but not
      in part, at a price of $0.05 per Right (the "Redemption Price").  The
      Rights may also be redeemed under certain circumstances:  (i) following an
      event giving rise to, and the expiration of the exercise period for, the
      Subscription Right if and for as long as an Acquiring Person beneficially
      owns securities having less than 15% of Westamerica's voting power and at
      the time of redemption there are no other persons who are Acquiring
      Persons; or (ii) in connection with a business combination involving
      Westamerica but not involving an Acquiring Person.

           Immediately upon the action of the Westamerica Board of Directors
      authorizing redemption of the Rights, the right to exercise the Rights
      will terminate and the only right of the holders of Rights will be to
      receive the Redemption Price.  Unless earlier redeemed by Westamerica, the
      Rights will expire at the close of business on December 31, 1999.  The
      foregoing description of the Amended and Restated Rights Agreement and the
      Rights is qualified in its entirety by reference to the Amended and
      Restated Rights Agreement and the Appointment Agreement.

           The Westamerica Shareholder Rights Plan may discourage or make more
      difficult or expensive certain mergers, tender offers or other purchases
      of Westamerica Common Stock.  The Westamerica Shareholder Rights Plan
      therefore may deprive shareholders in certain circumstances of an
      opportunity to sell some or all of their shares at a premium over then
      prevailing market prices.  Moreover, the Westamerica Shareholder Rights
      Plan may decrease the likelihood that a person or group would take control
      of Westamerica through such a tender offer, merger or other purchase of
      stock and remove incumbent management even if the holders of a majority of
      Westamerica's voting stock would favor such a change of control.  Dilution
      of stock interests under the Westamerica Shareholder Rights Plan generally
      would not result from a proxy contest to take control of Westamerica, even
      if the proxy contest were to be successful.  However, the Westamerica
      Shareholder Rights Plan will effectively limit to less than 15% the
      percentage of the Westamerica Common Stock outstanding which may be
      beneficially owned by the person or group soliciting proxies in opposition
      to the Westamerica Board of Directors.  This may discourage a person or
      group from waging, or decrease its prospects for winning, a proxy contest.

           CapitolBank does not have a plan comparable to the Westamerica
      Shareholder Rights Plan.


                    DESCRIPTION OF CAPITOLBANK CAPITAL STOCK

           The authorized capital stock of CapitolBank consists of 10,000,000
      shares of Common Stock, $1.5625 par value.  As of the Record Date,
      4,080,302 shares of CapitolBank Common Stock were issued and outstanding,
      an additional 180,533 shares of the authorized CapitolBank Common Stock
      were available for future grant, and 319,467 CapitolBank Shares were
      reserved for issuance to holders of outstanding and unexercised stock
      options under CapitolBank's Option Plan.


      Common Stock

           Holders of CapitolBank Common Stock are entitled to one vote for each
      share held of record on all matters submitted to a vote of shareholders,
      except that, upon giving the notice required by the CapitolBank Bylaws,
      shareholders may cumulate their votes for the election of directors.
      Shareholders are entitled to receive ratably such dividends as may be
      legally declared by CapitolBank's Board of Directors.  There are
      regulatory 

                                      -89-
<PAGE>
 
      restrictions on the ability of CapitolBank to declare and pay dividends, 
      and CapitolBank is currently prohibited from paying dividends. See 
      "Market Price and Dividend Information--Dividends and Dividend Policy."
      In the event of a liquidation, common shareholders are entitled
      to share ratably in all assets remaining after payment of liabilities and
      securities.  CapitolBank Common Stock is subject to assessments in
      accordance with  the California Financial Code.  The transfer agent and
      registrar for CapitolBank Common Stock is U.S. Stock Transfer Corporation.


                                    EXPERTS

           The Consolidated Financial Statements of Westamerica incorporated by
      reference in Westamerica's Annual Report on Form 10-K for the year ended
      December 31, 1993,  have been incorporated by reference herein and in the
      Registration Statement in reliance upon the report of KPMG, incorporated
      herein by reference, and upon the authority of said firm as experts in
      accounting and auditing.

           The Consolidated Financial Statements of CapitolBank as of and for
      the year ended December 31, 1993, included herein and elsewhere in this
      Proxy Statement/Prospectus have been included herein and in the
      Registration Statement in reliance upon the report of KPMG, independent
      certified public accountants, appearing elsewhere herein, and upon the
      authority of said firm as experts in accounting and auditing.

           The Consolidated Financial Statements of CapitolBank as of December
      31, 1992, and for each of the years in the two-year period ended December
      31, 1992, included herein and elsewhere in this Proxy Statement/Prospectus
      have been included herein and in the Registration Statement in reliance 
      upon the report of Arthur Andersen LLP, independent certified public 
      accountants, appearing elsewhere herein, and upon the authority of said 
      firm as experts in accounting and auditing.

           The Consolidated Financial Statements of PV Financial as of December
      31, 1993 and 1992, and for each of the years in the three-year period
      ended December 31, 1993 have been incorporated by reference herein and in
      the Registration Statement in reliance upon the report of Grant Thornton,
      independent certified public accountants, incorporated hereby by
      reference, and upon the authority of said firm as experts in accounting
      and auditing.


                                 LEGAL MATTERS

           The validity of the shares of Westamerica Common Stock offered hereby
      and certain legal matters in connection with the Merger will be passed
      upon for Westamerica by Pillsbury Madison & Sutro, San Francisco,
      California.


                            SOLICITATION OF PROXIES

           CapitolBank will bear the cost of the solicitation of proxies from
      its shareholders.  In addition to solicitation by mail, the directors,
      officers and employees of CapitolBank may solicit proxies from the
      shareholders by telephone or telegram or in person.  Such persons will not
      be additionally compensated, but will be reimbursed for reasonable out-of-
      pocket expenses incurred in connection with such solicitation.
      Arrangements will also be made with brokerage firms, nominees, fiduciaries
      and other custodians, for the forwarding of solicitation materials to the
      beneficial owners of shares held of record by such persons, and
      CapitolBank will reimburse such persons for their reasonable out-of-pocket
      expenses in connection therewith. CapitolBank has engaged the services of
      Corporate Investor Communications, Inc., a proxy solicitation firm, to
      assist it in the solicitation of proxies from its shareholders.


                         PROPOSALS OF SECURITY HOLDERS

           As specified in CapitolBank's Proxy Statement dated May 25, 1994, the
      deadline for shareholders to submit proposals for inclusion in the proxy
      statement and form of proxy for the 1995 Annual Meeting of Shareholders of
      CapitolBank was January 3, 1995.  If the Merger is consummated as
      contemplated by the Agreement, 

                                      -90-
<PAGE>
 
      CapitolBank will become a subsidiary of Westamerica and there will be no 
      CapitolBank 1995 Annual Meeting of Shareholders.

                                      -91-
<PAGE>
 
                         INDEX TO FINANCIAL STATEMENTS
 
 
CAPITOLBANK
 
Independent Auditors' Report (1993)........................................  F-2
 
Report of Independent Public Accountants (1992)............................  F-3
 
Consolidated Balance Sheets as of December 31, 1993 and 1992...............  F-4
 
Consolidated Statements of Operations for the Years Ended December 31, 
       1993, 1992 and 1991.................................................  F-5
 
Consolidated Statements of Shareholders' Equity for the Three Years Ended 
       December 31, 1993, 1992 and 1991....................................  F-6
 
Consolidated Statements of Cash Flows for the Years Ended December 31, 
       1993, 1992 and 1991.................................................  F-7
 
Notes to Consolidated Financial Statements.................................  F-8
 
Consolidated Balance Sheets as of September 30, 1994 (Unaudited) and 
       December 31, 1993................................................... F-18
 
Consolidated Statements of Operations for the Nine Months Ended 
       September 30, 1994 and 1993 (Unaudited)............................. F-19
 
Consolidated Statement of Changes in Stockholders' Equity for the Nine 
       Months Ended September 30, 1994 and 1993 (Unaudited) and the 
       Years Ended December 31, 1993 and 1992.............................. F-20
 
Consolidated Statements of Cash Flows for the Nine Months Ended 
       September 30, 1994 and 1993 (Unaudited)............................. F-21


                                      F-1
<PAGE>
 
                          INDEPENDENT AUDITORS' REPORT


      To the Shareholders and Board of Directors
      of CapitolBank Sacramento:


      We have audited the accompanying consolidated balance sheet of CapitolBank
      Sacramento and Subsidiaries as of December 31, 1993, and the related
      consolidated statements of operations, stockholders' equity and cash flows
      for the year then ended.  These consolidated financial statements are the
      responsibility of the Bank's management.  Our responsibility is to express
      an opinion on these consolidated financial statements based on our audit.
      The consolidated financial statements of CapitolBank Sacramento and
      Subsidiaries as of and for the years ended December 31, 1992 and 1991,
      were audited by other auditors whose report thereon dated February 19,
      1993, expressed an unqualified opinion on those consolidated statements.

      We conducted our audit 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 audit
      provides a reasonable basis for our opinion.

      In our opinion, the 1993 consolidated financial statements referred to
      above present fairly, in all material respects, the financial position of
      CapitolBank Sacramento and Subsidiaries as of December 31, 1993 and the
      results of their operations and their cash flows for the year then ended
      in conformity with generally accepted accounting principles.

      As discussed in Notes 1 and 7 to the consolidated financial statements,
      the Bank changed its method of accounting for income taxes in 1993 to
      adopt the provisions of the Financial Accounting Standards Board's
      Statement of Financial Accounting Standards No. 109, Accounting for Income
      Taxes.



                                          KPMG PEAT MARWICK LLP

      Sacramento, California
      February 25, 1994

                                      F-2
<PAGE>
 
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS


      To the Shareholders and Board of Directors
      of CapitolBank Sacramento:


      We have audited the accompanying consolidated balance sheet of CAPITOLBANK
      SACRAMENTO (a California state-chartered bank) AND SUBSIDIARIES as of
      December 31, 1992, and the related consolidated statements of operations,
      changes in stockholders' equity and cash flows for each of the two years
      in the period ended December 31, 1992.  These financial statements are the
      responsibility of the Bank'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 financial statements referred to above present fairly,
      in all material respects, the financial position of CapitolBank Sacramento
      and Subsidiaries as of December 31, 1992, and the results of their
      operations and their cash flows for each of the two years in the period
      ended December 31, 1992, in conformity with generally accepted accounting
      principles.



                                          ARTHUR ANDERSEN LLP

      Sacramento, California
      February 19, 1993

                                      F-3
<PAGE>
 
                             CAPITOLBANK SACRAMENTO
                          Consolidated Balance Sheets
<TABLE>
<CAPTION>
 
 
                                                           December 31,
                                                   ---------------------------
                                                       1993           1992
                                                   -------------  ------------
      <S>                                          <C>            <C>
      Assets
      Cash and due from banks....................  $  6,456,108   $  5,942,738
      Federal funds sold.........................     4,820,000      7,600,000
                                                   ------------   ------------
      Cash and cash equivalents..................    11,276,108     13,542,738
      Interest-bearing deposits with other banks.       398,000      4,470,000
      Investment securities at cost:
       Market values - $35,217,000 for 1993 and
        $35,146,000 for 1992.....................    34,342,296     34,188,798
      Loans, net of deferred fees and allowance
       for loan losses of $1,405,784 for 1993 
       and $1,170,174 for 1992...................    74,502,992     63,227,571
      Bank premises, leasehold improvements and
       equipment, net............................     1,484,333      1,784,846
      Other real estate owned....................        70,000        962,862
      Interest receivable and other assets.......     1,319,380      1,768,818
                                                   ------------   ------------
      Total Assets...............................  $123,393,109   $119,945,633
                                                   ============   ============
 
      Liabilities and Shareholders' Equity
      Deposits:
       Noninterest bearing.......................  $ 28,439,209   $ 25,198,108
       Interest bearing..........................    82,624,062     82,990,062
                                                   ------------   ------------
        Total deposits...........................   111,063,271    108,188,170
                                                   ------------   ------------
      Short-term borrowings......................     2,734,047      2,520,728
      Interest payable and other liabilities.....       378,305        334,370
                                                   ------------   ------------
        Total liabilities........................   114,175,623    111,043,268
                                                   ============   ============
 
      Commitments and contingent liabilities
       (Note 8)
 
      Shareholders' Equity
      Common stock-Par value $1.5625 per share;
       authorized 10,000,000 shares, issued 
       and outstanding 4,080,302 shares in 
       1993 and 1992.............................     6,375,472      6,375,472
      Paid in surplus............................     5,744,748      5,744,748
      Deficit....................................    (2,902,734)    (3,217,855)
                                                   ------------   ------------
        Total stockholders' equity...............     9,217,486      8,902,365
                                                   ------------   ------------
      Total Liabilities and Shareholders' Equity.  $123,393,109   $119,945,633
                                                   ============   ============
</TABLE>

      The accompanying notes are an integral part of these consolidated
      statements.

                                      F-4
<PAGE>
 
                             CAPITOLBANK SACRAMENTO
                     Consolidated Statements of Operations
<TABLE>
<CAPTION>
 
                                                  Years ended December 31,
                                           --------------------------------------
                                              1993         1992          1991
                                           ----------  -------------  -----------
<S>                                        <C>         <C>            <C>
      Interest income:
       Interest and fees on loans and
        leases...........................  $6,679,645    $6,333,944   $ 8,881,555
       Interest on federal funds sold....     162,284       146,688       247,673
       Interest on investment securities.   1,987,764     2,267,673     2,738,701
       Interest on deposits with other
        banks............................     121,149       376,801       620,120
                                           ----------    ----------   -----------
 
        Total interest income............   8,950,842     9,125,106    12,488,049
                                           ----------    ----------   -----------
 
      Interest expense:
       Interest on deposits..............   2,631,160     3,239,865     5,249,696
       Interest on short-term borrowings.      39,981        41,147        87,316
                                           ----------    ----------   -----------
 
        Total interest expense...........   2,671,141     3,281,012     5,337,012
                                           ----------    ----------   -----------
 
        Net interest income..............   6,279,701     5,844,094     7,151,037
      Provision for loan losses..........     436,000       519,778     1,066,823
                                           ----------    ----------   -----------
 
        Net interest income after
         provision for loan losses.......   5,843,701     5,324,316     6,084,214
                                           ----------    ----------   -----------
 
      Noninterest income:
       Service charges on deposit
        accounts.........................     128,711       223,306       227,427
       Trust fees and commissions........     689,221       705,291       648,418
       Gains on sale of other real
        estate owned.....................      49,197        16,960       149,195
       Gains on securities transactions,
        net..............................     282,729       268,619       448,694
       Real estate development revenue...          --        28,000       130,797
       Other income......................      63,195        48,057        66,306
                                           ----------    ----------   -----------
 
        Total noninterest income.........   1,213,053     1,290,233     1,670,837
                                           ----------    ----------   -----------
 
      Noninterest expense:
       Salaries and employee benefits....   3,379,284     3,359,829     3,186,070
       Net occupancy expense.............   1,402,170     1,439,257     1,371,807
       Equipment expense.................     396,701       417,270       391,793
       Divestiture of joint venture
        investment.......................          --     1,060,000            --
       Other operating expenses..........   1,484,978     2,201,762     2,523,568
                                           ----------    ----------   -----------
 
        Total noninterest expense........   6,663,133     8,478,118     7,473,238
                                           ----------    ----------   -----------
 
        Income (loss) before provision
         for income taxes
         and extraordinary item..........     393,621    (1,863,569)      281,813
      Provision for income taxes.........      78,500            --       114,453
                                           ----------    ----------   -----------
 
        Income (loss) before
         extraordinary item..............     315,121    (1,863,569)      167,360
 
      Extraordinary item, tax benefit of
       net operating loss carryforward...          --            --        44,000
                                           ----------    ----------   -----------
 
       Net income (loss).................  $  315,121   $(1,863,569)  $   211,360
                                           ==========    ==========   ===========
 
      Per share amounts:
       Income (loss) before
        extraordinary item...............  $     0.08    $    (0.46)  $      0.04
       Extraordinary item................          --            --          0.01
                                           ----------    ----------   -----------
        Net income (loss)................  $     0.08    $    (0.46)  $      0.05
                                           ==========    ==========   ===========
</TABLE>
      The accompanying notes are an integral part of these consolidated
      statements.

                                      F-5
<PAGE>
 
                             CAPITOLBANK SACRAMENTO
                Consolidated Statements of Shareholders' Equity
<TABLE>
<CAPTION>
 
 
                                        Common Stock
                                    ---------------------
                                    Number of               Paid in
                                     Shares      Amount     Surplus       Deficit         Total
                                    ---------  ----------  ----------  -------------  -------------
<S>                                 <C>        <C>         <C>         <C>            <C>
      Balance, December 31, 1990..  4,080,302  $6,375,472  $5,744,748   $(1,565,646)   $10,554,574

      Net income..................                                          211,360        211,360
                                    ---------  ----------  ----------    -----------   ----------- 

      Balance, December 31, 1991..  4,080,302   6,375,472   5,744,748    (1,354,286)    10,765,934

      Net loss....................                                       (1,863,569)    (1,863,569)
                                    ---------  ----------  ----------    -----------   ----------- 

      Balance, December 31, 1992..  4,080,302   6,375,472   5,744,748    (3,217,855)     8,902,365

      Net income..................                                          315,121        315,121
                                    ---------  ----------  ----------    -----------   ----------- 

      Balance, December 31, 1993..  4,080,302  $6,375,472  $5,744,748   $(2,902,734)   $ 9,217,486
                                    =========  ==========  ==========  ============    ===========
</TABLE>
      The accompanying notes are an integral part of these consolidated
      statements.

                                      F-6
<PAGE>
 
                             CAPITOLBANK SACRAMENTO
                     Consolidated Statements of Cash Flows
<TABLE>
<CAPTION>
                                                                              Years ended December 31,
                                                                  -----------------------------------------------
                                                                      1993             1992              1991
                                                                  -----------      ------------      ------------

<S>                                                               <C>              <C>               <C>
Cash Flows from Operating Activities:
 
Net income (loss)......................................           $   315,121      $ (1,863,569)     $    211,360
Adjustments to reconcile net income (loss) to net cash 
 provided by operating activities:
   Gain on sale on investment securities...............              (282,729)         (268,619)         (448,694)
   Amortization of discounts and premiums, net.........               148,845           128,049           (14,048)
   Provision for loan losses...........................               436,000           519,778         1,066,823
   Increase (decrease) in deferred loan fees, net......               401,536           116,662          (135,234)
   Depreciation and amortization.......................               375,045           408,732           420,949
   Provision for other real estate owned...............                61,721           466,000                --
   Gain on sale of other real estate owned.............               (49,197)          (16,960)         (149,195)
   Deferred taxes......................................                78,500                --                --
Net change in operating assets & liabilities:
   Interest receivable & other assets..................               370,938           954,321           545,687
   Interest payable & other liabilities................                43,935           188,613          (429,070)
                                                                  -----------      ------------      ------------
Net cash provided by operating activities..............             1,899,715           633,007         1,068,578
                                                                  -----------      ------------      ------------

Cash Flows from Investing Activities:
 
Purchase of certificates of deposit....................            (2,876,000)       (5,265,000)       (9,043,000)
Purchase of investment securities......................           (16,315,143)      (15,345,755)      (40,532,870)
Proceeds from maturity of certificates of deposit......             6,948,000         9,640,000         8,078,000
Proceeds from maturity of investment securities........             3,706,092        14,725,020        10,723,711
Proceeds from sale of investment securities............            12,589,437        13,569,444        17,890,737
Loans originated and principal collected, net..........           (13,386,732)        2,501,799         9,253,921
Additions to bank premises and equipment...............               (74,532)          (91,963)         (300,831)
Proceeds from sale of other real estate owned..........             2,154,113         1,305,958         1,138,068
                                                                  -----------      ------------      ------------
Net cash (used for) provided by investing activities...            (7,254,765)       21,039,503        (2,792,264)
                                                                  -----------      ------------      ------------

Cash Flows from Financing Activities:
 
Net increase (decrease) in deposits....................             2,875,101       (25,432,336)       (1,783,935)
Net increase (decrease) in short term borrowings.......               213,319        (1,284,746)          315,667
                                                                  -----------      ------------      ------------
Net cash provided by (used for) financing activities...             3,088,420       (26,717,082)       (1,468,268)
                                                                  -----------      ------------      ------------
Decrease in cash and cash equivalents..................            (2,266,630)       (5,044,572)       (3,191,954)
Cash and cash equivalents, at beginning of year........            13,542,738        18,587,310        21,779,264
                                                                  -----------      ------------      ------------

Cash and cash equivalents, at end of year..............           $11,276,108      $ 13,542,738      $ 18,587,310
                                                                  ===========      ============      ============

Supplemental Disclosures:
 Cash paid for interest................................           $ 2,642,819      $  3,385,533      $  5,493,347
 Cash paid for taxes...................................                21,500             8,000           271,651
 Total gross additions to other real estate............             1,273,775         1,827,860         1,878,873
</TABLE>

 The accompanying notes are an integral part of these consolidated statements.

                                      F-7
<PAGE>
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



      1.   Summary of Significant Accounting Policies

      The accounting and reporting policies of CapitolBank Sacramento and
      Subsidiaries conform with generally accepted accounting principles and
      prevailing practices within the banking industry.  The following is a
      summary of the significant accounting and reporting policies used in
      preparing the consolidated financial statements.

      Principles of Consolidation
      ---------------------------

      The consolidated financial statements include the accounts of CapitolBank
      Sacramento (the Bank) and its wholly-owned subsidiaries, Capitol Commerce
      Development Corporations VI and VII and Commerce Corporation.  All
      material intercompany accounts and transactions have been eliminated in
      consolidation.

      Cash and Cash Equivalents
      -------------------------

      For the purpose of the statement of cash flows, the Bank considers cash
      and amounts due from banks and Federal funds sold to be cash and cash
      equivalents.

      Investment Securities
      ---------------------

      Investment securities are carried at cost, adjusted for amortization of
      premium and accretion of discount.  Premiums and discounts are amortized
      and accreted using the interest method.  Gains or losses on the sale of
      securities are determined on the specific identification method and are
      shown separately in the consolidated statements of operations.  No
      allowance for market decline, if any, is provided as interest is current
      on the investment portfolio and management intends and has the ability to
      hold these investments until maturity.

      Allowance for Loan Losses
      -------------------------

      The allowance for loan losses is maintained at a level considered adequate
      to provide for losses that can reasonably be expected to occur.  Bank
      management makes continuous credit reviews of the loan portfolio and
      considers current economic conditions, historical loan loss experience and
      other factors in determining the adequacy of this allowance.  The
      evaluation process requires the use of current estimates which may vary
      from the ultimate losses.  As adjustments to these estimates become
      necessary, they are charged to operations in the periods when they become
      known.

      Material estimates relating to the determination of the allowance for loan
      losses are particularly susceptible to significant change in the near
      term.  Management believes that the allowance for loan losses is adequate.
      While management uses available information to recognize losses on loans,
      future additions to the allowance may be necessary based on changes in
      economic conditions.  In addition, the Federal Deposit Insurance
      Corporation (the FDIC), as an integral part of its examination process,
      periodically reviews the Bank's allowance for loan losses.  The FDIC may
      require the Bank to recognize additions to the allowance based on their
      judgment about information available to them at the time of their
      examination.

      Bank Premises, Leasehold Improvements and Equipment
      ---------------------------------------------------

      Bank premises, leasehold improvements and equipment are carried at cost.
      Depreciation is computed using the straight-line method over the estimated
      useful lives of the related assets.  Estimated useful lives of the
      premises and equipment are from three to ten years.  Leasehold
      improvements at the Bank's main office are amortized over twenty years,
      representing the term of the lease of fifteen years and one of three five-
      year renewal options.  Leasehold improvements at the Bank's auxiliary
      office are amortized over five years in accordance with the term of the
      lease.

      When assets are retired or otherwise disposed of, the cost and related
      accumulated depreciation are removed from the accounts and any resulting
      gain or loss is recognized in income for the period.  The cost of
      maintenance and repairs is charged to expense as incurred; significant
      renewals or betterments are capitalized.

                                      F-8
<PAGE>
 
      Real Estate Joint Venture Divestiture
      -------------------------------------

      During 1992, the Bank elected to divest itself of a real estate joint
      venture project initiated in 1990 through its wholly-owned subsidiary,
      Capitol Commerce Development Company VI.  Funding of this development
      project had been capitalized and included in Other Assets in prior periods
      on the Bank's Consolidated Balance Sheet.  The expense associated with the
      elimination of this investment was charged to Non-Interest Expense during
      the year ended December 31, 1992.

      Other Real Estate
      -----------------

      Other real estate includes real estate acquired in full or partial
      settlement of loan obligations.  When property is acquired, any excess of
      the Bank's recorded investment in the loan balance and accrued interest
      income over the estimated fair market value of the property is charged
      against the allowance for loan losses.  Thereafter, it is carried at the
      lower of cost or fair value minus estimated selling costs.  Fair value is
      generally determined based upon periodic independent third party
      appraisals.  Subsequent gains or losses on sales or writedowns are
      recorded in other income or expense as incurred.

      Interest and Fees on Loans
      --------------------------

      Interest on loans is calculated by using the simple interest method on the
      daily balance of the principal amount outstanding.  However, when, in the
      opinion of management, the future collectibility of interest and principal
      is in serious doubt, a loan is placed on nonaccrual status and the accrual
      of interest income is suspended.  Any interest accrued but unpaid is
      charged against income.  Interest accruals are resumed on such loans only
      when they are brought fully current with respect to interest and principal
      and when, in the judgment of management, the loans are estimated to be
      fully collectible as to both principal and interest.

      Substantially all loan origination fees, commitment fees, direct loan
      origination costs and discounts on loans are deferred and recognized as an
      adjustment of yield, to be amortized to interest income over the
      contractual term of the loan.  The unamortized balance of deferred fees
      and costs is reported as a component of net loans.

      Income Taxes
      ------------

      Effective January 1, 1993 the Bank adopted the provisions of Statement of
      Financial Accounting Standards No. 109, Accounting for Income Taxes (SFAS
                                                                          -----
      109).  The cumulative effect of that change in the method of accounting
      ---                                                                    
      for income taxes was not material.  Under the asset and liability method
      of SFAS 109, deferred tax assets and liabilities are recognized for the
         --------                                                            
      future tax consequences attributable to differences between the financial
      statement carrying amounts of existing assets and liabilities and their
      respective tax bases and operating loss and tax credit carryforwards.
      Deferred tax assets and liabilities are measured using enacted tax rates
      expected to apply to taxable income in the years in which those temporary
      differences are expected to be recovered or settled.  Under SFAS 109, the
                                                                  --------     
      effect on deferred tax assets and liabilities of a change in tax rates is
      recognized in income in the period that includes the enactment date.

      Pursuant to the deferred method under APB Opinion 11, which was applied in
      1992 and prior years, deferred income taxes are recognized for income and
      expense items that are reported in different years for financial reporting
      purposes and income tax purposes using the tax rate applicable for the
      year of the calculation.  Under the deferred method, deferred taxes are
      not adjusted for subsequent changes in tax rates.

      In the financial statements, deferred tax assets, net of deferred tax
      liabilities are included in interest receivable and other assets.

                                      F-9
<PAGE>
 
      Reclassifications
      -----------------

      Certain reclassifications have been made to prior years' balances to
      conform with classifications used in 1993.
 
      2.    Investment Securities

      The amortized cost and estimated market values of investment securities
      are as follows at December 31, 1993:

<TABLE>
<CAPTION>
                                            Gross        Gross       Estimated
                              Amortized   Unrealized   Unrealized      Market
                                Cost        Gains        Losses        Value
                             -----------  ----------  ------------  ------------
<S>                          <C>          <C>         <C>           <C>
 
U.S. Treasury..............  $25,162,828    $845,298       $14,126   $25,994,000
U.S. Agency................    3,033,800     100,200            --     3,134,000
Mortgage-backed............    5,643,687      19,229        76,916     5,586,000
Obligations of State and
 Political Subdivisions....      251,981       1,019            --       253,000
Other......................      250,000          --            --       250,000
                             -----------    --------       -------   -----------
                             $34,342,296    $965,746       $91,042   $35,217,000
                             ===========    ========       =======   ===========
</TABLE> 
 
      The amortized cost and estimated market values of investment securities
      are as follows at December 31, 1992:

<TABLE> 
<CAPTION> 
                                             Gross       Gross       Estimated
                              Amortized    Unrealized  Unrealized      Market
                                Cost         Gains       Losses        Value
                             -----------   ----------  -----------  ------------
<S>                          <C>           <C>        <C>           <C>
                                                      
U.S. Treasury..............  $27,325,384   $  827,914      $54,298   $28,099,000
U.S. Agency................    4,031,063      108,778        2,421     4,137,000
Mortgage-backed............    2,327,394       79,606           --     2,407,000
Obligations of State and                              
 Political Subdivisions....      254,957           --        2,377       253,000
Other......................      250,000           --           --       250,000
                             -----------   ----------      -------   -----------
                             $34,188,798   $1,016,298      $59,096   $35,146,000
                             ===========   ==========      =======   ===========
</TABLE>

      The amortized cost and estimated market value of investment securities at
      December 31, 1993 by contractual maturity are shown below.  Expected
      maturities will differ from contractual maturities because borrowers may
      have the right to call or prepay obligations with or without call or
      prepayment penalties.
<TABLE>
<CAPTION>
 
                                                       Estimated
                                           Amortized     Market
                                             Cost         Value
                                          -----------  -----------
<S>                                       <C>          <C>
 
Due in one year or less.................  $ 3,256,415  $ 3,342,000
Due after one year through five years...   23,431,980   24,195,000
Due after five years through ten years..    2,010,214    2,094,000
                                          -----------  -----------
 
                                           28,698,609   29,631,000
 
Mortgage-backed.........................    5,643,687    5,586,000
                                          -----------  -----------
 
                                          $34,342,296  $35,217,000
                                          ===========  ===========
</TABLE>

      Gross gains realized on sales of investment securities totaled $283,998,
      $305,560 and $449,543 in 1993, 1992 and 1991, respectively.  Gross losses
      of $1,269, $36,941 and $849 were realized on sales of investment
      securities in 1993, 1992 and 1991, respectively.

      The book value of securities pledged to secure public deposits totaled
      $12,416,000 and $11,438,000 at December 31, 1993 and 1992, respectively.

                                      F-10
<PAGE>
 
      3.   Loans and Allowance for Loan Losses

      Outstanding loans are summarized as follows:

<TABLE>
<CAPTION>
                                            December 31,
                                     --------------------------
                                         1993          1992
                                     ------------  ------------
      <S>                            <C>           <C>
 
      Real estate construction.....  $21,188,594   $12,439,932
      Real estate mortgage.........   30,684,510    27,410,064
      Commercial and agricultural..   21,637,422    21,437,041
      Consumer installment.........    2,196,718     2,863,165
      Other........................    1,041,009       688,221
                                     -----------   -----------
                                      76,748,253    64,838,423
 
      Unearned discount............      (13,274)      (16,011)
      Allowance for loan losses....   (1,405,784)   (1,170,174)
      Deferred loan fees...........     (826,203)     (424,667)
                                     -----------   -----------
                                     $74,502,992   $63,227,571
                                     ===========   ===========
</TABLE>

      Real estate loans totaling $0 and $490,000 were pledged to secure public
      deposits at December 31, 1993 and 1992, respectively.  Activity in the
      allowance for loan losses is summarized as follows:

<TABLE>
<CAPTION>
                                       1993         1992          1991
                                    -----------  -----------  ------------
      <S>                           <C>          <C>          <C>
 
      Balance, beginning of year..  $1,170,174   $1,122,597   $ 1,161,245
      Provision for loan losses...     436,000      519,778     1,066,823
      Recoveries..................     160,959      207,617        44,209
      Loans charged off...........    (361,349)    (679,818)   (1,149,680)
                                    ----------   ----------   -----------
      Balance, end of year........  $1,405,784   $1,170,174   $ 1,122,597
                                    ==========   ==========   ===========
</TABLE>

      At December 31, 1993 and 1992, loans totaling approximately $138,000 and
      $2,151,000 respectively were on non-accrual status.

      The aggregate effect of non-accrual loans was to reduce interest income by
      approximately $87,000, $159,000 and $248,000 for the years ended December
      31, 1993, 1992 and 1991, respectively.

      4.  Bank Premises, Leasehold Improvements and Equipment

      A summary of Bank premises, leasehold improvements and equipment is as
      follows:

<TABLE>
<CAPTION>
                                                      December 31,
                                           -----------------------------------
                                              1993                    1992
                                           -----------             -----------
      <S>                                  <C>                     <C>
 
      Bank premises and equipment.....     $ 2,054,105             $ 1,991,426
      Leasehold Improvements..........       1,955,240               1,955,967
                                           -----------             -----------
                                             4,009,345               3,947,393
      Less accumulated depreciation...      (2,525,012)             (2,162,547)
                                           -----------             -----------
                                           $ 1,484,333             $ 1,784,846
                                           ===========             ===========
</TABLE> 
 
      Depreciation charged to expense amounted to $375,045, $408,732 and
      $420,949 in 1993, 1992 and 1991, respectively.
       

                                      F-11
<PAGE>
 
      5.  Interest-Bearing Deposits
 
      Interest-bearing deposits consisted of the following:

<TABLE> 
<CAPTION>  
                                                       December 31,
                                           -----------------------------------
                                              1993                    1992
                                           -----------             -----------
      <S>                                  <C>                     <C> 

      Savings.....................         $ 4,017,207             $ 6,127,289
      Money Market................          46,618,981              42,168,853
      NOW Accounts................          16,600,870              17,095,435
      Time, $100,000 or More......           8,323,775               9,632,686
      Other Time..................           7,063,229               7,965,799
                                           -----------             -----------
                                           $82,624,062             $82,990,062
                                           ===========             -----------
</TABLE>

      Interest expense recognized on time deposits of $100,000 or more during
      the years ended December 31, 1993, 1992 and 1991 totaled $349,000,
      $540,000 and $1,259,000, respectively.

      6.   Short-Term Borrowings

      Short-term borrowings consist of treasury tax and loan deposits and
      generally mature within one to 120 days from the transaction date.

      The Bank has a $3 million unsecured Federal funds purchase agreement with
      one of its correspondent banks.  There were no borrowings outstanding
      under this agreement at December 31, 1993 and 1992.

      7.   Income Taxes

      As discussed in Note 1, the Bank adopted SFAS 109 as of January 1, 1993.
                                               --------                        
      The cumulative effect of that change in the method of accounting for
      income taxes was not material.  Prior years' consolidated financial
      statements have not been restated to apply the provisions of SFAS 109.
                                                                   -------- 

      The provision for income taxes for the years ended December 31, 1993, 1992
      and 1991 consists of the following:
<TABLE>
<CAPTION>
                              1993          1992          1991
                            --------      --------      --------
<S>                         <C>           <C>           <C> 
 
Current
 Federal............        $     --      $     --      $ 84,453
 State..............              --            --        30,000
                            --------      --------      --------
                            $     --      $     --      $114,453
                                                      
Deferred                                              
 Federal............          50,500            --            --
 State..............          28,000            --            --
                            --------      --------      --------
                            $ 78,500      $     --      $114,453
                            ========      ========      ========
</TABLE>

      Significant temporary differences and carryforwards that give rise to the
      deferred tax assets and liabilities as of December 31, 1993 are as
      follows:

<TABLE>
      <S>                                                 <C>
      Deferred tax assets:
       Allowance for loan losses...............           $   291,700
       Net operating loss carryforwards........             1,600,200
       General tax credit carryforwards........               226,800
       Other                                                   16,500
                                                          -----------
         Total gross deferred tax assets.......             2,135,200
         Less valuation reserve................            (1,827,000)
                                                          -----------
         Net deferred tax assets...............               308,200
                                                          -----------
 
      Deferred tax liabilities:
       Bank premises, leasehold improvements
        and equipment..........................              (104,100)
                                                          -----------
         Total gross deferred tax liabilities..              (104,100)
                                                          -----------
         Net deferred taxes....................           $   204,100
                                                          ===========
</TABLE>

                                      F-12
<PAGE>
 
      A valuation allowance has been provided for net operating loss
      carryforwards and the general tax credit carryforwards because of the
      uncertainty surrounding their realization.

      The provision for income taxes differs from the amounts computed by
      applying the statutory federal tax rates to income before taxes.  The
      reasons for the differences are as follows:

<TABLE>
<CAPTION>
                                             1993                 1992                1991
                                      -----------------     ----------------    ----------------
                                       Amount      Rate      Amount     Rate     Amount     Rate
                                      --------    -----     --------   -----    --------   -----
<S>                                   <C>         <C>       <C>        <C>      <C>        <C>
 
Federal income tax expense at
 statutory rates....................  $133,800     34.0%     (30,213)  (34.0%)  $ 95,816    34.0%
 
State franchise taxes, net of
 Federal income tax benefit.........    28,000      7.1     (131,400)   (7.1)     19,605     7.0
 
Tax benefit of loss carry-forwards..   (63,900)   (16.2)     761,613    41.1
 
Other, net..........................   (19,400)    (5.0)                            (968)   (0.3)
                                      --------    -----     --------   -----    --------   -----
                                      $ 78,500     19.9%    $     --      --%   $114,453    40.7%
                                      ========    =====     ========   =====    ========   =====
</TABLE>

      At December 31, 1993, the Bank has the following net operating loss (NOL)
      and tax credit carryforwards for tax return purposes:

<TABLE>
<CAPTION>
                                  Federal
    Expires                    Operating Loss   Tax Credit
 December 31,                   Carryforward   Carryforward
- ---------------                --------------  ------------
<S>                            <C>             <C>
               
     2001                                       $  227,000
     2002                          $  744,000
     2003                             390,000
     2005                              40,000
     2007                           4,465,000
     2008                              26,000
                                   ----------   ----------
                                   $5,665,000   $  227,000
                                   ==========   ==========
</TABLE>

      The Bank also has alternative minimum tax net operating loss carryforwards
      for tax purposes of approximately $6 million, which are available to
      reduce future alternative minimum taxable income.  These carryforwards
      expire in various years through December 31, 2007.

      The Internal Revenue Code imposes restrictions on a bank's ability to
      utilize net operating loss ("NOL") and tax credit carryforwards if a 50
      percent change in ownership occurs within a three-year period.  Changes in
      ownership are defined to include, among other things, ownership changes
      involving owners of 5 percent or more of a bank's common stock and public
      stock offerings.

      Certain events in the future, including the issuance of additional shares
      of the Bank's common stock or activities involving persons owning 5
      percent or more of the Bank's common stock, could occur that would trigger
      such a change in control. This may result in the loss of some or all of
      the Bank's NOL or tax credit carryforwards.

      8.   Commitments and Contingent Liabilities

      Financial Instruments with Off-Balance Sheet Risk
      -------------------------------------------------

      The Bank makes commitments to extend credit in the normal course of
      business to meet the financing needs of its customers.  Commitments to
      extend credit are agreements to lend to a customer as long as there is no
      violation of any condition established in the contract.  Commitments
      generally have fixed expiration dates or other termination clauses and may
      require payment of a fee.  Since many of the commitments are expected to
      expire without being drawn upon, the total commitment amount does not
      necessarily represent future cash requirements.

      The Bank is exposed to credit loss, in the event of nonperformance by the
      borrower, in the contract amount of the commitment.  The Bank uses the
      same credit policies in making commitments as it does for on-balance sheet
      instruments and evaluates each customer's creditworthiness on a case-by-
      case basis.  The amount of collateral 

                                      F-13
<PAGE>
 
      obtained, if deemed necessary by the Bank, is based on management's credit
      evaluation of the borrower. Collateral held varies but may include cash,
      accounts receivable, inventory, equipment and real estate property.

      The Bank also issues standby letters of credit which are unconditional
      commitments to guarantee the performance of a customer to a third party.
      These guarantees are primarily issued to support construction bonds,
      private borrowing arrangements and similar transactions.  Most of these
      guarantees are short-term commitments expiring in decreasing amounts
      through 1994 and are not expected to be drawn upon.  The credit risk
      involved in issuing letters of credit is essentially the same as that
      involved in extending loan facilities to customers.  The Bank holds
      collateral as deemed necessary, as described above.

      The contract amount of commitments not reflected on the balance sheet at
      December 31, 1993 and 1992 is as follows:

<TABLE>
<CAPTION>
                                           1993         1992
                                        -----------  -----------
      <S>                               <C>          <C>
      Loan Commitments................  $25,488,000  $13,459,000
      Standby Letters of Credit.......      974,000    2,609,000
</TABLE>

      Significant Concentration of Credit Risk
      ----------------------------------------

      The Bank accepts deposits and grants credit primarily within its local
      service area which the Bank has identified as the Greater Sacramento Area.
      That comprises the four counties of Sacramento, El Dorado, Placer and
      Yolo.  At year-end, the Bank had construction loans comprising 27.61% of
      the loan portfolio.  This comprises 17.2% of total assets at December 31,
      1993.

      Although the Bank has a diversified loan portfolio, a substantial portion
      of its portfolio is secured by commercial and residential real estate.

      Federal Reserve Requirements
      ----------------------------

      Banks are required to maintain reserves with the Federal Reserve Bank
      equal to a percentage of their reservable deposits.  The reserve balances
      held with the Federal Reserve Bank totaled $1,013,000 and $901,000 as of
      December 31, 1993 and 1992, respectively.

      Operating Leases
      ----------------

      The Bank has executed a non-cancelable operating lease for its main office
      space.  The lease provides for an initial term of fifteen years, three
      five-year renewal options, and a market value adjustment at the end of 10
      years.  In addition, the Bank has executed a non-cancelable operating
      lease for its auxiliary office space.  The lease provides for a term of
      five years.  Both operating leases are included in the following schedule
      of future minimum lease payments as of December 31, 1993:

<TABLE>
<CAPTION>

      Year Ending
      December 31,
      ------------
        <S>                 <C>
          1994              $1,377,000
          1995               1,408,000
          1996               1,386,000
          1997               1,339,000
          1998               1,339,000
        1999-2000            1,674,000
                            ----------
                            $8,523,000
                            ==========
</TABLE>

      Rental expense under operating leases totaled  $1,239,000, $1,230,000 and
      $1,165,000 in 1993, 1992 and 1991, respectively.

      Legal Actions
      -------------

      The Bank is involved in litigation of a routine nature which is being
      defended in the ordinary course of the Bank's business.  In the opinion of
      management, the resolution of this litigation will have no material impact
      on the Bank's financial position.

                                      F-14
<PAGE>
 
      9.   Shareholders' Equity

      Capital Adequacy
      ----------------

      The Federal Deposit Insurance Corporation has specified guidelines for
      purposes of evaluating a Bank's capital adequacy.  Banks are required to
      satisfy two separate capital requirements.

      First, banks must meet a minimum leverage capital ratio ranging from three
      to five percent based upon the bank's CAMEL (capital adequacy, asset
      quality, management, earnings and liquidity) rating.  At December 31,
      1993, the Bank's leverage capital ratio was 7.54%.

      Second, banks must meet a minimum risk-based capital ratio of 8.0%.  Risk-
      based capital guidelines vary from leverage capital guidelines by
      redefining the components of capital, categorizing assets into different
      risk classes, and including certain off-balance sheet items in the
      calculation of the capital ratio.  The effect of the risk-based capital
      guidelines is that banks with high risk exposure will be required to raise
      additional capital while institutions with low risk exposure could, with
      the concurrence of regulatory authorities, be permitted to operate with
      lower capital ratios.  The Bank's risk-based capital ratio at December 31,
      1993 was 12.90%.

      Earnings Per Share
      ------------------

      Earnings per share amounts were computed on the basis of the weighted
      average number of shares of common stock outstanding during the year.
      There were no dilutive common stock equivalents outstanding during 1993,
      1992 or 1991.  The number of shares used for the computations was
      4,080,302 in all three years.

      Dividend Restrictions
      ---------------------

      Under California banking laws, the Bank may not pay cash dividends without
      prior approval until such time as the deficit in undivided profits is
      restored and there are sufficient earnings to cover the dividends.

      Stock Options
      -------------

      During June 1992, the Board of Directors adopted an incentive stock option
      plan (the Plan).  Final approval of the Plan was subject to the Bank
      obtaining the approval of the State Banking Department and the
      stockholders.  The State Banking Department approved the Plan in July 1992
      and the stockholders approved the Plan at the 1993 annual stockholders'
      meeting.

      Under the terms of the Plan, 306,023 shares of common stock have been
      reserved for issuance to employees of the Bank. The Plan requires that the
      option price of all options granted may not be less than the fair market
      value of the stock at the date the option is granted, and that the stock
      must be paid for in full at the time the option is exercised. All options
      expire on a date determined by the Board of Directors, but not later than
      ten years from the date of the grant.

      The following summarizes the activity under the Plan:

<TABLE>
      <S>                                    <C>
                                
      Balance January 1, 1992.............        --
        Options Granted...................   141,608
                                             -------
      Balance December 31, 1992...........   141,608
        Options Canceled..................   (26,400)
                                             -------
      Balance December 31, 1993...........   115,208
                                             =======
</TABLE>

      Stock options granted during 1992 were not exercisable until the Plan was
      approved by the stockholders.  At December 31, 1993, stock options for
      24,801 shares were exercisable at a price of $2.00 per share.

      10.  Other Expenses

      Other expenses consisted of the following:

                                      F-15
<PAGE>
 
<TABLE>
<CAPTION>
                                                 1993        1992        1991
                                              ----------  ----------  ----------
<S>                                           <C>         <C>         <C>
 
      FDIC Assessment.......................  $  279,721  $  258,058  $  257,779
      Legal fees............................     211,117     226,312     192,184
      Professional services.................     148,768     233,619     276,990
      Stationery, printing and supplies.....     101,210     100,895     114,744
      Data processing.......................      76,300      78,699     156,891
      Provision for loss on other real
       estate...............................      61,721     466,000          --
      Client data processing................      18,477      97,909     145,236
      Special stockholder meeting...........          --          --     712,822
      Other.................................     587,664     740,270     666,922
                                              ----------  ----------  ----------
                                              $1,484,978  $2,201,762  $2,523,568
                                              ==========  ==========  ==========
</TABLE>

      11.  Related Party Transactions

      In the normal course of business, the Bank enters into transactions with
      related parties, including directors, principal shareholders and their
      affiliates.  The transactions are on substantially the same terms and
      conditions as those prevailing for comparable transactions with unrelated
      parties.  It is the Bank's policy not to make loans to Directors; and
      accordingly, no loans were outstanding to Directors at December 31, 1993
      and 1992, respectively.

      12.  Tax Deferred Investment Plan

      The Bank established a trusteed tax deferred investment plan (the "Plan")
      for all eligible employees during 1988.  The Plan permits each employee to
      contribute up to 15% of compensation on a pre-tax basis up to a specified
      maximum, which for calendar year 1993, was $8,994.  The Bank provides a
      matching contribution of $1.00 for every $1.00 of compensation deferred by
      the employee with a maximum matching contribution of 3% of the employee's
      annual compensation.  The Bank's Plan expense totaled $54,000, $54,400 and
      $56,900 for the years ending December 31, 1993, 1992 and 1991,
      respectively.

      13.  Regulatory Agreements

      On February 24, 1993, the Bank entered into a Memorandum of Understanding
      (the "Memorandum") with the Federal Deposit Insurance Corporation (the
      "FDIC") and the California State Banking Department (the "State") as a
      result of a joint examination of the Bank by the FDIC and the State.

      The FDIC performed a subsequent examination of the Bank as of November 15,
      1993.  Based upon the results of the examination, on February 7, 1994, the
      FDIC, along with the State, terminated the existing Memorandum.

      14.  Prospective Accounting Pronouncements

      Impairment of Loans
      -------------------

      In May of 1993, the Financial Accounting Standards Board issued Statement
      of Financial Accounting Standards No. 114, Accounting by Creditors for
      Impairment of a Loan.  This statement applies to financial statements for
      fiscal years beginning after December 15, 1994.  It requires that impaired
      loans be measured based on the present value of expected  future cash
      flows discounted at the loan's effective interest rate or, as a practical
      expedient, at the loan's observable market price or the fair value of the
      collateral if the loan is collateral dependent.  Initial adoption of this
      statement is required to be reflected prospectively.  The Bank has not
      completed the analysis necessary to determine the impact, if any, of this
      statement on its financial position or results of operations.

      Investments
      -----------

      In May of 1993, the Financial Accounting Standards Board issued Statement
      of Financial Accounting Standards No. 115, Accounting for Certain
      Investments in Debt and Equity Securities.  This statement applies to
      financial statements for fiscal years beginning after December 15, 1993
      and is to be applied as of the beginning of an enterprise's fiscal year.
      Initial adoption of this statement is required to be reflected
      prospectively.  The statement requires that investments of equity
      securities that have readily determinable fair values and all investments
      in debt securities be classified in these categories and accounted for as
      follows:

           .    Debt securities that the enterprise has the positive intent and
                ability to hold to maturity are classified as held-to-maturity
                securities and reported at amortized cost.

                                      F-16
<PAGE>
 
           .    Debt and equity securities that are bought and held principally
                for the purpose of selling them in the near term are classified
                as trading securities and reported at fair value, with
                unrealized gains and losses included in earnings.

           .    Debt and equity securities not classified as either held-to-
                maturity securities or trading securities are classified as
                available-for-sale securities and reported at fair value, with
                unrealized gains and losses excluded from earnings and reported
                in a separate component of stockholders' equity.

      The Bank adopted this statement as of January 1, 1994.  If the provisions
      of the statement would have been applied as of December 31, 1993,
      stockholders' equity would have been increased by approximately $220,000.

      Fair Value Disclosures
      ----------------------

      In December 1991, the Financial Accounting Standards Board issued
      Statement of Financial Accounting Standards No. 107 "Disclosures about
      Fair Value of Financial Instruments."  The provisions of Statement 107 are
      effective for financial statements issued for years ending after December
      15, 1992 for entities whose total assets exceed $150 million.  For those
      entities whose total assets are less than $150 million at December 15,
      1992, the provisions of Statement 107 are effective for years ended after
      December 15, 1995.  Statement 107 requires the disclosure of the fair
      value of financial instruments for which it is practicable to estimate
      that value.  Most loan and deposit instruments issued by financial
      institutions will be subject to Statement 107.  These disclosures apply to
      off-balance sheet financial instruments as well as those recorded on the
      balance sheet.

                                      F-17
<PAGE>
 
                             CAPITOLBANK SACRAMENTO
                          Consolidated Balance Sheets

<TABLE>
<CAPTION>
                                                   September 30,
                                                       1994       December 31,
                                                    (unaudited)       1993
                                                    -----------  --------------
                                                          (In thousands)
      <S>                                           <C>          <C>
      Assets:
      Cash and due from banks.....................    $  8,495        $  6,456
      Interest-bearing deposits in banks..........           0             398
      Investment securities.......................      17,606          34,342
      Federal funds sold..........................      21,500           4,820
      Loans, net of reserve for loan losses.......      87,511          74,503
      Premises and equipment, net.................       1,294           1,484
      Interest receivable and other assets........       1,563           1,390
                                                      --------        --------
        Total assets..............................    $137,969        $123,393
                                                      ========        ========
 
      Liabilities:
      Deposits:
       Demand accounts............................    $ 32,868        $ 28,439
       Money market accounts......................      72,616          63,219
       Time and savings accounts..................      20,542          19,405
                                                      --------        --------
        Total deposits............................     126,026         111,063
 
      Short-term borrowings.......................       1,719           2,734
      Other liabilities...........................         952             378
                                                      --------        --------
        Total liabilities.........................     128,697         114,175
 
      Shareholders' Equity:
      Common stock, par value $1.5625
       Authorized - 10,000,000 shares
       Issued and outstanding - 4,080,302 shares
        in 1994 and 4,080,302 in 1993.............       6,375           6,375
      Paid in surplus.............................       5,745           5,745
      Securities valuation adjustment.............        (227)              0
      Undivided profits...........................      (2,621)         (2,902)
                                                      --------        --------
        Total shareholder's equity................       9,272           9,218
                                                      --------        --------
 
      Total Liabilities and Shareholders' Equity..    $137,969        $123,393
                                                      ========        ========
</TABLE>

                                      F-18
<PAGE>
 
                             CAPITOLBANK SACRAMENTO
                     Consolidated Statements of Operations
                                  (Unaudited)
<TABLE>
<CAPTION>
 
                                             Nine months ended September 30,
                                             -------------------------------
                                              1994                     1993
                                             ------                   ------
                                         (In thousands except per share amounts)
<S>                                          <C>                      <C>
                                                       
Interest income:                                       
Interest and fees on loans.............      $6,032                   $4,866
Interest on federal funds sold.........         193                      124
Interest on investment securities......       1,275                    1,632
                                             ------                   ------
  Total interest income................       7,500                    6,622
                                             ------                   ------
                                                                   
Interest expense:                                                  
Interest on deposits...................       1,827                    2,005
Interest on short-term borrowings......          41                       32
                                             ------                   ------
  Total interest expense...............       1,868                    2,037
                                             ------                   ------
                                                                   
Net interest income....................       5,632                    4,585
Provision for loan losses..............         285                      336
                                             ------                   ------
                                                                   
 Net interest income after provision                               
  for loan losses......................       5,347                    4,249
                                             ------                   ------
                                                                   
Noninterest income:                                                
Income from fiduciary activity.........         547                      496
Service charges on deposit accounts....          74                       97
Other revenue..........................          75                       99
                                             ------                   ------
  Total noninterest income.............         696                      692
                                             ------                   ------
                                                                   
Gains on securities transactions.......          82                      283
                                                                   
Noninterest expense:                                               
Salaries and related expenses..........       2,998                    2,560
Net occupancy..........................       1,135                    1,053
Other expense..........................       1,656                    1,421
                                             ------                   ------
  Total noninterest expense............       5,789                    5,034
                                                                   
Income before income taxes.............         336                      190
                                                                   
Income tax expense.....................          55                       26
                                             ------                   ------
                                                                   
Net income.............................      $  281                   $  164
                                             ======                   ======
                                                                   
Net income per share...................      $ 0.07                   $ 0.04
                                             ======                   ======
</TABLE>

                                      F-19
<PAGE>
 
                             CAPITOLBANK SACRAMENTO
           Consolidated Statement of Changes in Shareholders' Equity
                                  (Unaudited)

<TABLE>
<CAPTION>
                            Common Stock              
                        --------------------                   Securities 
                        Number of                Paid-in       Valuation     Undivided
                         Shares     Amount       Surplus       Adjustment     Profits     Total
                        ---------  ---------  --------------  -------------  ---------  -----------
                                                      (In thousands)
<S>                     <C>        <C>        <C>             <C>            <C>        <C>
 
Balance,
 December 31, 1992....      4,080  $   6,375  $        5,745  $           0  $  (3,218) $     8,902
Net Income............                                                             164          164
Securities Valuation
 Adjustment...........                                                                            0
                        ---------  ---------  --------------  -------------  ---------  -----------
Balance,
 September 30, 1993...      4,080  $   6,375  $        5,745  $           0  $  (3,054) $     9,066
                        =========  =========  ==============  =============  =========  ===========
<CAPTION>
                            Common Stock              
                        --------------------                   Securities 
                        Number of                Paid-in       Valuation     Undivided
                         Shares     Amount       Surplus       Adjustment     Profits     Total
                        ---------  ---------  --------------  -------------  ---------  -----------
                                                      (In thousands)
<S>                     <C>        <C>        <C>             <C>            <C>        <C> 
 
Balance,
 December 31, 1993....      4,080  $   6,375  $        5,745  $           0  $  (2,902) $     9,218
Net Income............                                                             281          281
Securities Valuation
 Adjustment...........                                                 (227)                   (227)
                        ---------  ---------  --------------  -------------  ---------  -----------
Balance,
 September 30, 1994...      4,080  $   6,375  $        5,745  $        (227) $  (2,621) $     9,272
                        =========  =========  ==============  =============  =========  ===========
</TABLE>

                                      F-20
<PAGE>
 
                             CAPITOLBANK SACRAMENTO
                     Consolidated Statements of Cash Flows
                                  (Unaudited)

<TABLE>
<CAPTION>
                                                                      Nine months ended September 30,
                                                                      -------------------------------
                                                                          1994               1993
                                                                        --------           --------
     <S>                                                                <C>                <C>

      Cash Flows from Operating Activities:

      Reconciliation of net income to net cash
       provided by operating activities:

      Net income..................................................       $   281           $    164
      Adjustments to reconcile net income to net cash provided
       by operating activities:
        Provision for possible loan losses........................           285                336
        Depreciation and amortization.............................           302                284
        Net change in operating assets and liabilities:
         Interest receivable and other assets.....................          (141)               301
         Interest payable and other liabilities...................           574                106
                                                                        --------           --------
      Total adjustments...........................................         1,020              1,027

      Net cash provided by operating activities...................         1,301              1,191

      Cash Flows from Investing Activities:

      Maturity (purchase) of investment securities................        16,509            (12,226)
      Proceeds from sale or maturity of investment securities.....           398             20,103
      Loans originated and principal collected, net...............       (13,293)           (12,473)
      Additions to premises and equipment.........................          (111)               (58)
      Net change in other real estate owned.......................           (33)               324
                                                                        --------           --------
      Net cash provided by investing activities...................         3,470             (4,330)

      Cash Flows from Financing Activities:

      Net increase in deposits....................................        14,963              2,564
      Net (decrease) in short-term borrowings.....................        (1,015)              (182)
                                                                        --------           --------
      Net cash provided by financing activities...................        13,948              2,382
                                                                        --------           --------

      Increase (decrease) in cash and cash equivalents............        18,719               (757)
      Cash and cash equivalents, at beginning of period...........        11,276             13,542
                                                                        --------           --------

      Cash and cash equivalents, at end of period.................      $ 29,995           $ 12,785
                                                                        ========           ========

      Supplemental Disclosures:
       Cash paid for interest.....................................      $  1,868           $  2,012
       Cash paid for taxes........................................      $     55           $      8
       Total gross additions to other real estate.................      $     63           $  1,359
       Securities valuation adjustment............................          (227)                 0
</TABLE>

                                      F-21
<PAGE>
 
                                                                         ANNEX A


================================================================================



                      AGREEMENT AND PLAN OF REORGANIZATION


                                    between


                           WESTAMERICA BANCORPORATION


                                      and



                             CAPITOLBANK SACRAMENTO



                         DATED AS OF NOVEMBER 17, 1994



================================================================================
<PAGE>
 
<TABLE> 
<CAPTION> 

                                              TABLE OF CONTENTS
                                              -----------------

                                                                                                           Page
<S>                                                                                                        <C>  
1.   THE MERGER............................................................................................  1
     1.1    Effective Time.................................................................................  1
     1.2    Effect of the Merger...........................................................................  1

2.   CONVERSION AND CANCELLATION OF SHARES.................................................................  2
     2.1    Conversion of Common Stock of Capitol..........................................................  2
     2.2    Fractional Shares..............................................................................  4
     2.3    Surrender of Capitol Shares....................................................................  4
     2.4    No Further Transfers of Capitol Shares.........................................................  5
     2.5    Adjustments....................................................................................  5
     2.6    Treatment of Stock Options.....................................................................  5

3.   COVENANTS OF THE PARTIES..............................................................................  5
     3.1    Covenants of Westamerica.......................................................................  5
            (a)    Reservation, Issuance and Registration of Westamerica Common Stock......................  5
            (b)    Government Approvals....................................................................  6
            (c)    Notification of Breach of Representations, Warranties and Covenants.....................  6
            (d)    Financial Statements....................................................................  6
            (e)    Press Releases..........................................................................  7
            (f)    Business Combinations...................................................................  7
            (g)    Director & Officer Liability............................................................  7
            (h)    Extraordinary Dividends.................................................................  7
     3.2    Covenants of Capitol...........................................................................  8
            (a)    Approval by Capitol Shareholders........................................................  8
            (b)    Shareholder Lists and Other Information.................................................  8
            (c)    Government Approvals....................................................................  8
            (d)    Capital Commitments and Expenditures....................................................  8
            (e)    Notification of Breach of Representations, Warranties and Covenants.....................  8
            (f)    Financial Statements....................................................................  9
            (g)    Compensation............................................................................  9
            (h)    Conduct of Business in the Ordinary Course.............................................. 10
            (i)    Press Releases.......................................................................... 12
            (j)    No Merger or Solicitation............................................................... 12
            (k)    Capitol 401(k) Plan..................................................................... 13
            (l)    Outsourcing to Westamerica.............................................................. 13
            (m)    Changes in Capital Stock................................................................ 13
            (n)    Dividends............................................................................... 13
            (o)    Accounting Methods...................................................................... 13
            (p)    Affiliates.............................................................................. 14
            (q)    Additional Agreements................................................................... 14
            (r)    Access to Properties, Books and Records; Confidentiality................................ 14
            (s)    Employee Welfare Benefit Plans.......................................................... 14
            (t)    Execution and Delivery of Stock Option Agreement........................................ 14
            (u)    Noncompetition Agreements............................................................... 14
            (v)    Litigation Developments................................................................. 14
            (w)    Net Operating Loss Carryforward......................................................... 14
     3.3    Covenants of the Parties....................................................................... 14

4.   REPRESENTATIONS AND WARRANTIES OF CAPITOL............................................................. 15
            (a)    Corporate Status and Power to Enter Into Agreements..................................... 15

</TABLE> 

                                       -i-
         
<PAGE>
 
<TABLE>

<S>                                                                                                         <C>
          (b)    Articles, Bylaws, Books and Records......................................................  15
          (c)    Compliance With Laws, Regulations and Decrees............................................  15
          (d)    Capitalization...........................................................................  16
          (e)    Equity Interests.........................................................................  16
          (f)    Financial Statements, Regulatory Reports.................................................  16
          (g)    Tax Returns..............................................................................  17
          (h)    Material Adverse Change..................................................................  17
          (i)    No Undisclosed Liabilities...............................................................  17
          (j)    Properties and Leases....................................................................  18
          (k)    Material Contracts.......................................................................  19
          (l)    Classified Loans.........................................................................  19
          (m)    Restrictions on Investments..............................................................  19
          (n)    Employment Contracts and Benefits........................................................  19
          (o)    Compliance With ERISA....................................................................  21
          (p)    Collective Bargaining and Employment Agreements..........................................  21
          (q)    Compensation of Officers and Employees...................................................  21
          (r)    Legal Actions and Proceedings............................................................  21
          (s)    Execution and Delivery of the Agreement..................................................  22
          (t)    Retention of Broker or Consultant........................................................  22
          (u)    Insurance................................................................................  22
          (v)    Loan Loss Reserves.......................................................................  22
          (w)    Transactions With Affiliates.............................................................  23
          (x)    Information in Westamerica Registration Statement........................................  23
          (y)    Accuracy of Representations and Warranties...............................................  23
          (z)    No Brokered Deposits.....................................................................  23

5.   REPRESENTATIONS AND WARRANTIES OF WESTAMERICA........................................................  24
          (a)    Corporate Status and Power to Enter Into Agreement.......................................  24
          (b)    Corporate Status and Power of Westamerica................................................  24
          (c)    Certificate, Bylaws, Books and Records...................................................  24
          (d)    Compliance With Laws, Regulations and Decrees............................................  24
          (e)    Financial Statements.....................................................................  24
          (f)    Material Adverse Change..................................................................  25
          (g)    Execution and Delivery of the Agreement..................................................  25
          (h)    Information in Westamerica Registration Statement........................................  26
          (i)    Accuracy of Representations and Warranties...............................................  26
          (j)    Capitalization...........................................................................  26
          (k)    Tax Returns..............................................................................  26

6.   SECURITIES ACT OF 1933; SECURITIES EXCHANGE ACT OF 1934..............................................  27
          (a)    Preparation and Filing of Registration Statement.........................................  27
          (b)    Effectiveness of Registration Statement..................................................  27
          (c)    Sales and Resales of Common Stock........................................................  27
          (d)    Rule 145.................................................................................  27

7.   CONDITIONS TO THE OBLIGATIONS OF WESTAMERICA.........................................................  28
          (a)    Representations and Warranties...........................................................  28
          (b)    Compliance and Performance Under Agreement...............................................  28
          (c)    Material Adverse Change..................................................................  28
          (d)    Approval of Agreement....................................................................  28
          (e)    Officer's Certificate....................................................................  28
          (f)    Opinion of Counsel.......................................................................  28
          (g)    Absence of Legal Impediment..............................................................  28
          (h)    Effectiveness of Registration Statement..................................................  29
</TABLE>
                                          -ii-
<PAGE>
 
<TABLE>

<S>                                                                                                         <C>
         (i)    Government Approvals......................................................................  29
         (j)    Tax Opinion or Ruling.....................................................................  29
         (k)    Accountant's Letter.......................................................................  29
         (l)    Dissenting Shares.........................................................................  29
         (m)    Unaudited Financials......................................................................  30
         (n)    Letter Regarding Insurance Coverage.......................................................  30
         (o)    Closing Documents.........................................................................  30
         (p)    Consents..................................................................................  30
         (q)    Fairness Opinions.........................................................................  30
         (r)    Losses in Investment and Loan Portfolios..................................................  30
         (s)    Satisfaction of Spending or Other Commitments.............................................  31
         (t)    Pooling-of-Interests Accounting Treatment; Dissenters' Rights.............................  31
         (u)    Compliance Examinations...................................................................  31
         (v)    Opinion of Loan Review Examiner...........................................................  31
         (w)    Regulatory Examination....................................................................  31
         (x)    Stock Option Agreement....................................................................  31
         (y)    Classified Loans..........................................................................  31
         (z)    Noncompetition Agreements and Certificate.................................................  31
         (aa)   Resignation of Directors and Certain Executive Officers...................................  31

8.   CONDITIONS TO THE OBLIGATIONS OF CAPITOL.............................................................  32
         (a)    Representations and Warranties............................................................  32
         (b)    Compliance and Performance Under Agreement................................................  32
         (c)    Material Adverse Change...................................................................  32
         (d)    Officer's Certificate.....................................................................  32
         (e)    Approval of Agreement.....................................................................  32
         (f)    Opinion of Counsel........................................................................  32
         (g)    Effectiveness of Registration Statement...................................................  32
         (h)    Government Approvals......................................................................  32
         (i)    Tax Opinion or Ruling.....................................................................  32
         (j)    Closing Documents.........................................................................  33
         (k)    Absence of Legal Impediment...............................................................  33
         (l)    Fairness Opinion..........................................................................  33
         (m)    Pooling-of-Interests Accounting Treatment.................................................  33

9.   CLOSING..............................................................................................  33
         (a)    Closing Date..............................................................................  33
         (b)    Delivery of Documents.....................................................................  33
         (c)    Filings...................................................................................  33

10.  POST-CLOSING MATTERS.................................................................................  33

11.  EXPENSES.............................................................................................  33

12.  AMENDMENT; TERMINATION...............................................................................  34
         (a)    Amendment.................................................................................  34
         (b)    Termination...............................................................................  34
         (c)    Notice....................................................................................  35
         (d)    Breach of Obligations.....................................................................  35
         (e)    Termination and Expenses..................................................................  35
         (f)    Special Westamerica Rights of Termination.................................................  36

13.  MISCELLANEOUS........................................................................................  36
         (a)    Notices...................................................................................  36

</TABLE>

                                         -iii-
  
<PAGE>
 
<TABLE>

<S>                                                                                                         <C>
          (b)    Binding Agreement........................................................................  37
          (c)    No Survival of Representations and Warranties............................................  37
          (d)    Governing Law............................................................................  37
          (e)    Attorneys' Fees..........................................................................  37
          (f)    Entire Agreement; Severability...........................................................  37
          (g)    Counterparts.............................................................................  37
          (h)    Waivers..................................................................................  37

  
SCHEDULE OF EXHIBITS
- --------------------
 
Exhibit A-1   -  Merger Sub Merger Agreement
Exhibit A-2   -  Westamerica Bank Merger Agreement
Exhibit B     -  Noncompetition Agreement for Capitol Nonemployee
                 Directors (Wickland)
Exhibit B-1   -  Noncompetition Agreement for Capitol Nonemployee
                 Directors
Exhibit C     -  Certificate and Agreement of Capitol Directors
Exhibit D     -  Opinion of Capitol Counsel
Exhibit E     -  Certificate of Affiliates
Exhibit F     -  Schedule of Noncompetition Agreement Signatories
Exhibit G     -  Letter Regarding Insurance Coverage
Exhibit H     -  Opinion of Westamerica Counsel

</TABLE>

                                         -iv-
<PAGE>
 
                     AGREEMENT AND PLAN OF REORGANIZATION
                     ------------------------------------


     THIS AGREEMENT AND PLAN OF REORGANIZATION, dated as of November 17, 1994
("Agreement"), is between WESTAMERICA BANCORPORATION, a California corporation
                          --------------------------                          
("Westamerica"), and CAPITOLBANK SACRAMENTO, a California banking corporation
                     ----------------------                                  
("Capitol").

                             W I T N E S S E T H:

     A.   The Boards of Directors of Westamerica and Capitol deem it advisable
and in the best interests of Westamerica, Capitol and their respective
shareholders to consummate the business combination provided for herein whereby
Westamerica would acquire Capitol and the goodwill associated therewith through
the merger of Capitol with a Westamerica subsidiary (the "Merger") such that on
the effective date of the Merger, Capitol will either be a wholly-owned
subsidiary of Westamerica or merged into Westamerica's Westamerica Bank
subsidiary (it being the intent of the parties that in any event Capitol will
ultimately be merged into Westamerica Bank).

     B.   This Agreement and the Merger Agreement, as defined herein, have been
approved by the Boards of Directors of Westamerica and Capitol, and will be
submitted for approval of the shareholders of Capitol at a special meeting of
its shareholders.

     C.   The Merger is intended to qualify as a tax-free reorganization within
the meaning of the provisions of Section 368 of the Internal Revenue Code of
1986, as amended (the "IRC").

     D.   Pursuant to the Merger and subject to the terms and conditions herein,
each holder of common stock of Capitol will receive, in exchange for common
stock of Capitol, Westamerica common stock in the ratio of .0938 of a share of
Westamerica common stock for each share of Capitol common stock, subject to
adjustment as more fully set forth in this Agreement.

     E.   As a condition and inducement to Westamerica's willingness to enter
into this Agreement, Westamerica and Capitol are entering into immediately after
the execution and delivery hereof a Stock Option Agreement dated as of the date
hereof (the "Stock Option Agreement") pursuant to which Capitol shall grant
Westamerica an option to purchase shares of the common stock of Capitol.

     NOW, THEREFORE, in consideration of the foregoing and the respective
representations, warranties, covenants and agreements provided for or contained
herein, the parties hereto agree as follows:


     1.   THE MERGER.
          ---------- 

     1.1   Effective Time.  Subject to the terms and conditions of this
           --------------                                              
Agreement, upon the filing with the California Secretary of State of a duly
executed Merger Agreement substantially in the form attached hereto as Exhibit
A-1 (the "Merger Agreement") and officers' certificates prescribed by Section
1103 of the California General Corporation Law ("GCL") or at such time
thereafter as is provided in the Merger Agreement (the "Effective Time") the
Merger shall become effective.  The date on which the merger is effective as
specified in the Merger Agreement shall be referred to herein as the "Effective
Date."

     1.2   Effect of the Merger.
           -------------------- 

     (a)   Subject to the terms and conditions of this Agreement and the Merger
Agreement, at the Effective Time on the Effective Date, Capitol shall be merged
with a wholly-owned subsidiary of Westamerica (the "Merger Sub") and Capitol
shall be the surviving corporation (the "Surviving Corporation") in the Merger.
All assets, rights, goodwill, privileges, immunities, powers, franchises and
interests of Capitol and the Merger Sub in and to every type of property (real,
personal and mixed) and chooses in action, as they

                                      -1-
<PAGE>
 
exist as of the Effective Date, including appointments, designations and
nominations and all other rights and interests as trustee, executor,
administrator, registrar of stocks and bonds, guardian of estate, assignee,
receiver and in every other fiduciary capacity, shall pass and be transferred to
and vest in the Surviving Corporation by virtue of the Merger at the Effective
Time without any deed, conveyance or other transfer; the separate existence of
the Merger Sub shall cease and the corporate existence of Capitol as the
Surviving Corporation shall continue unaffected and unimpaired by the Merger;
and the Surviving Corporation shall be deemed to be the same entity as each of
Capitol and the Merger Sub and shall be subject to all of their duties and
liabilities of every kind and description. The Surviving Corporation shall be
responsible and liable for all the liabilities and obligations of each of
Capitol and the Merger Sub; and any claim existing or action or proceeding
pending by or against Capitol may be prosecuted as if the Merger had not taken
place, or the Surviving Corporation may be substituted in its place. Neither the
rights of creditors nor any liens upon the property of either Capitol or the
Merger Sub shall be impaired by reason of the Merger.

     (b)   Westamerica agrees to cause Westamerica Bank to merge with the
Surviving Corporation as soon as practicable following the Effective Date
pursuant to a duly executed agreement of merger substantially in the form
attached hereto as Exhibit A-2 whereby Westamerica Bank will be the surviving
corporation succeeding to all the rights and liabilities set forth in Section
1.2(a) above pursuant to applicable law, and the Surviving Corporation will be
the disappearing corporation (the "WAB Merger Agreement").

     (c)   Notwithstanding anything in this Agreement to the contrary, the
parties understand and agree that the final form of the transaction contemplated
herein will depend upon Westamerica's further investigation of the tax and other
circumstances pertaining to Capitol. Accordingly, Capitol agrees that should
Westamerica determine in its sole discretion that Capitol should be merged with
and into Westamerica Bank on and as of the Effective Date nothing in this
Agreement shall preclude Westamerica from accomplishing such a result provided
that the condition in section 7(j) herein is satisfied. In the event Westamerica
exercises its right to merge Capitol into Westamerica Bank on and as of the
Effective Date pursuant to this section 1.2(c), all references in this Agreement
to the Merger Agreement shall be deemed to refer to the WAB Merger Agreement and
Westamerica Bank shall succeed to all of the rights and liabilities of the
Surviving Corporation set forth in Section 1.2(a) above pursuant to applicable
law. The parties acknowledge that appropriate modifications to Exhibit A-2 would
be required.


     2.    CONVERSION AND CANCELLATION OF SHARES.
           ------------------------------------- 

     2.1   Conversion of Common Stock of Capitol.  At the Effective Time, by
           -------------------------------------                            
virtue of the Merger and without any action on the part of the holder of any
common stock of Capitol (a "Capitol Share" or "Capitol Shares"):

     (a)   Each issued and outstanding Capitol Share (other than fractional
shares or any shares as to which dissenters' rights have been perfected) shall
be converted into .0938 of a fully paid and nonassessable share of the
registered common stock, without par value, of Westamerica (the "Westamerica
Common Stock" or "Westamerica Shares"), subject to adjustment as specified in
subsections (b) and (c) herein (the "Exchange Ratio"). All such Capitol Shares
shall no longer be outstanding and shall automatically be canceled and retired
and shall cease to exist, and each certificate previously representing any such
shares shall thereafter represent the Westamerica Shares into which such Capitol
Shares have been converted. Certificates previously representing Capitol Shares
shall be exchanged for certificates representing whole shares of Westamerica
Common Stock issued in consideration therefor upon the surrender of such
certificates in accordance with Section 2.3.

     (b)   The Exchange Ratio shall be adjusted downward for any Significant
Liabilities (as defined below) if in the aggregate these Significant Liabilities
total more than $150,000.  "Significant Liabilities", as used in this Agreement,
shall mean those liabilities or expenses (whether operating or capital in
nature) relating to those categories and events described in the next sentence
which have not been reflected as reductions to Capitol's consolidated book value
pursuant to generally accepted accounting principles as of 

                                      -2-
<PAGE>
 
September 30, 1994, provided, however, that any individual component of said
                    -----------------
aggregate amount must reasonably be estimated to exceed $25,000. Significant
Liabilities shall consist of the following categories or events, provided that
Significant Liabilities shall not include any of the following to which
Westamerica has consented in writing: (i) new or extended contractual
obligations; (ii) new or extended leases of real or personal property; (iii)
acquisition of capital assets (or commitments to do so); (iv) new or expanded
contingent liabilities based upon threatened or pending litigation or other
proceedings or hazardous or toxic substances and legal fees and costs (whether
actual or estimated) related thereto; (v) any expenses, fines, fees, penalties
or similar obligations, except those which arose in the Ordinary Course of
Business as defined in Section 3.2(h)(i); (vi) any new, expanded or accelerated
pension or other benefits including employment contracts and severance payments,
whether or not vested; and (vii) the aggregate amount of the difference between
the exercise price of any stock options or stock appreciation rights granted
after June 30, 1994, by Capitol and $3.00 per share.

     The amount of the Significant Liabilities in the case of the arrangements
described in (i), (ii), and (vi) above, shall equal (a) any payment that could
be made as of the Effective Date that would terminate the arrangement without
further liability or expense to Capitol or Westamerica or (b) if the arrangement
does not provide for such a payment, the present value of the amount of the
remaining payments payable pursuant to the arrangement after the Effective Date
using a discount rate equivalent to Westamerica's then current cost of funds.
The amount of Significant Liabilities in the case of (iii) above shall equal the
amount expended or required to be expended under binding commitments for a
capital asset, minus the amount for which the capital asset could actually be
sold on a liquidation basis.  Significant Liabilities shall not include fees of
Capitol's financial advisors or Capitol's legal fees directly attributable to
this Merger.  Significant Liabilities shall not include approximately $200,000
already accrued for Capitol's 1994 bonus pool, approximately $140,000 for
Capitol's employee retention contracts and all amounts payable to Thayer T.
Prentice and William J. Martin pursuant to Sections 3.4 and 3.5 of each of the
aforementioned's employment agreement with Capitol dated as of March 30, 1994
and April 2, 1994, respectively.  As a result of any Significant Liabilities
totaling more than $150,000 in the aggregate through the close of business on
the day preceding the Effective Date, the Exchange Ratio shall be reduced by an
amount calculated as follows, provided that not more than $1,000,000 of such
Significant Liabilities shall be taken into account:

                       .0938 - (Significant Liabilities)
                               -------------------------
                                      $130 Million

     (c)   If, as of two business days preceding the Effective Date, the average
of the closing price of Westamerica Common Stock quoted on the Nasdaq National
Market ("Nasdaq") (calculated by taking an average of the closing prices quoted
on Nasdaq as reported in The Wall Street Journal on each of the twenty
                         -----------------------                      
consecutive trading days prior to two business days prior to the Effective Date,
rounded to 4 decimal places, whether or not trades occurred on those days (the
"Average Price")) is above $33.00 or below $30.20 (with no adjustment if the
Average Price is between $30.20 and $33.00), the Exchange Ratio will be adjusted
as follows, rounded to 4 decimal places:

          (1)   If the Average Price is below $30.20, Capitol may accept the
     Exchange Ratio calculated solely in accordance with Sections 2.1(a) and (b)
     hereof or Westamerica and Capitol shall have the right, but not the
     obligation, to renegotiate the Exchange Ratio. Should Capitol fail to
     accept the Exchange Ratio as described in the preceding sentence or should
     the parties fail to renegotiate the Exchange Ratio, Capitol may terminate
     this Agreement pursuant to the provisions of Section 12(b).

          (2)   If the Average Price is above $33.00, the Exchange Ratio as
     adjusted pursuant to Section 2.1(b), will be adjusted downward by one half
     of the amount by which the Average Price is above $33.00, according to the
     following formula:

                              (Average Price + $33.00)/2
                     .0938 x  --------------------------
                                     Average Price

                                      -3-
<PAGE>
 
     (d)   From and after the Effective Time, the holders of certificates
formerly representing Capitol Shares shall cease to have any rights with respect
thereto other than any dissenters' rights they have perfected pursuant to
Chapter 13 of the GCL.

     2.2   Fractional Shares.  Notwithstanding any other provision hereof, no
           -----------------                                                 
fractional shares of Westamerica Common Stock shall be issued to holders of
Capitol Shares.  In lieu thereof, each such holder entitled to a fraction of a
share of Westamerica Common Stock shall receive, at the time of surrender of the
certificate or certificates representing such holder's Capitol Shares, an amount
in cash equal to the Average Price (defined in Section 2.1(c)) multiplied by the
fraction of a share of Westamerica Common Stock to which such holder otherwise
would be entitled.  No such holder shall be entitled to dividends, voting
rights, interest on the value of, or any other rights in respect of a fractional
share.

     2.3   Surrender of Capitol Shares.
           --------------------------- 

     (a)   Prior to the Effective Date, Westamerica shall appoint Chemical Trust
Company of California or its successor, or any other bank or trust company
(having capital of at least $50 million) mutually acceptable to Capitol and
Westamerica, as exchange agent (the "Exchange Agent") for the purpose of
exchanging certificates representing the Westamerica Shares and at and after the
Effective Date, Westamerica shall issue and deliver to the Exchange Agent
certificates representing the Westamerica Shares, as shall be required to be
delivered to holders of Capitol Shares pursuant to Section 2.1 of this
Agreement.  As soon as practicable after the Effective Date, each holder of
Capitol Shares converted pursuant to Section 2.1, upon surrender to the Exchange
Agent of one or more certificates for such Capitol Shares for cancellation, will
be entitled to receive a certificate representing the number of Westamerica
Shares determined in accordance with Section 2.1 and a payment in cash with
respect to fractional shares, if any, determined in accordance with Section 2.2.
Each certificate representing Westamerica Shares will bear a notation
incorporating the Amended Rights Agreement (as that term is defined in Section
5(j) herein), by reference and certificates representing the Westamerica Shares
will evidence and entitle the holders thereof to certain rights as set forth in
and subject to the terms of the Amended Rights Agreement ("Rights").
Certificates issued for the Westamerica Shares shall be deemed to be
certificates for said Rights.

     (b)   No dividends or other distributions of any kind which are declared
payable to shareholders of record of the Westamerica Shares after the Effective
Date will be paid to persons entitled to receive such certificates for
Westamerica Shares until such persons surrender their certificates representing
Capitol Shares.  Upon surrender of such certificate representing Capitol Shares,
the holder thereof shall be paid, without interest, any dividends or other
distributions with respect to the Westamerica Shares as to which the record date
and payment date occurred on or after the Effective Date and on or before the
date of surrender.

     (c)   If any certificate for Westamerica Shares is to be issued in a name
other than that in which the certificate for Capitol Shares surrendered in
exchange therefor is registered, it shall be a condition of such exchange that
the person requesting such exchange shall pay to the Exchange Agent any transfer
costs, taxes or other expenses required by reason of the issuance of
certificates for such Westamerica Shares in a name other than the registered
holder of the certificate surrendered, or such persons shall establish to the
satisfaction of Westamerica and the Exchange Agent that such costs, taxes or
other expenses have been paid or are not applicable.

     (d)   All dividends or distributions, and any cash to be paid pursuant to
Section 2.2 in lieu of fractional shares, if held by the Exchange Agent for
payment or delivery to the holders of unsurrendered certificates representing
Capitol Shares and unclaimed at the end of one year from the Effective Date,
shall (together with any interest earned thereon) at such time be paid or
redelivered by the Exchange Agent to Westamerica, and after such time any holder
of a certificate representing Capitol Shares who has not surrendered such
certificate to the Exchange Agent shall, subject to applicable law, look as a
general creditor only to Westamerica for payment or delivery of such dividends
or distributions or cash, as the case may be.

                                      -4-
<PAGE>
 
     2.4   No Further Transfers of Capitol Shares.  At the Effective Date, the
           --------------------------------------                             
stock transfer books of Capitol shall be closed and no transfer of Capitol
Shares theretofore outstanding shall thereafter be made.

     2.5   Adjustments.  If, between the date of this Agreement and the
           -----------        
Effective Date, the outstanding shares of Westamerica common stock shall have
been changed into a different number of shares or a different class by reason of
any reclassification, recapitalization, split up, combination, exchange of
shares or readjustment, or a stock dividend thereon shall be declared with a
record date within such period, the number of Westamerica Shares to be issued
and delivered in the Merger in exchange for each outstanding Capitol Share shall
be correspondingly adjusted with the result that the holders of Capitol Shares
shall receive the same economic benefit set forth in Section 2.1 above.

     2.6   Treatment of Stock Options.  Each person holding one or more options
           --------------------------                                          
to purchase Capitol Shares pursuant to the 1992 Stock Option Plan (the "Option
Plan"), shall have the right, in his or her discretion, to:

     (a)   Exercise any vested options granted under the Option Plan to acquire
Capitol Shares prior to the Effective Date and Capitol will facilitate the
exercise of those options by allowing the options to be exercised and taxes paid
by Capitol withholding the appropriate number of shares from the shares subject
to the options or by any other method permitted by applicable law; and/or

     (b)   Have any options whether or not vested that are not exercised
converted into options to purchase shares of Westamerica common stock.

     Following the Effective Date, shares of Westamerica common stock shall be
substituted under the options for Capitol Shares based on the Exchange Ratio in
a form acceptable to Westamerica.  Specifically, each option shall be deemed to
continue as an option to purchase the number of shares of Westamerica common
stock equal to the Exchange Ratio multiplied by the number of Capitol Shares
previously covered by such option at an option exercise price for each such
share of Westamerica common stock equal to the previous option exercise price
for each Capitol Share divided by the Exchange Ratio.  Each Capitol stock option
shall otherwise continue on terms and conditions that are consistent with those
that were applicable immediately before the Effective Date.


     3.    COVENANTS OF THE PARTIES.
           ------------------------ 

     3.1   Covenants of Westamerica.
           ------------------------ 

     (a)   Reservation, Issuance and Registration of Westamerica Common Stock.
           ------------------------------------------------------------------  
Westamerica shall reserve and make available for issuance in connection with the
Merger and in accordance with the terms of this Agreement (i) the Westamerica
Shares; and (ii) the maximum number of shares of common stock of Westamerica to
which the option holders of Capitol may be entitled pursuant to Section 2.6
above at or after the Effective Date. All Westamerica Shares will, when issued
and delivered pursuant to and in accordance with the terms of this Agreement be
duly authorized, validly issued, fully paid and nonassessable. Westamerica shall
file and cause to be declared effective pursuant to the Securities Act of 1933,
as amended (the "1933 Act") one or more registration statements covering all
such shares and shall cause all such shares to be issued in compliance with the
1933 Act and in compliance with all applicable state securities laws and
regulations.

     (b)   Government Approvals.  Prior to the Effective Date, Westamerica, with
           --------------------                                                 
the cooperation of Capitol, shall use its best efforts in good faith to take or
cause to be taken as promptly as practicable all such steps as shall be
necessary to obtain (i) the prior approval of the Merger by the Board of
Governors of the Federal Reserve System (the "FRB") under the Bank Holding
Company Act of 1956, as amended ("BHC Act"), and (ii) all other consents and
approvals of government agencies as are required by law or otherwise, and shall
do any and all acts deemed by Westamerica to be necessary or appropriate in
order to cause the 

                                      -5-
<PAGE>
 
Merger to be consummated on the terms provided in this Agreement as promptly as
practicable. All approvals referred to in clauses (i) and (ii) of this Section
3.1(b) are hereinafter referred to as the "Government Approvals." Subject to
Capitol's compliance with its obligations under Section 3.2(c) herein, in the
event this Agreement is terminated by either party pursuant to Section 12(b)
because the FRB or other government agency whose consent or approval is required
by law in order to consummate the Merger disapproves or otherwise informs
Westamerica that it will not approve the Merger or imposes conditions that cause
Westamerica not to proceed with the Merger, upon demand, Westamerica shall pay
Capitol $1,200,000. In the event this Agreement is terminated by either party
pursuant to the preceding sentence and Section 12(b) herein, upon payment of
$1,200,000 to Capitol neither Westamerica nor any agent thereof shall have any
further liability to Capitol.

     (c)   Notification of Breach of Representations, Warranties and Covenants.
           -------------------------------------------------------------------  
Westamerica shall promptly give written notice to Capitol upon becoming aware of
the occurrence or impending or threatened occurrence of any event which would
cause or constitute a breach of any of the representations, warranties or
covenants of Westamerica contained or referred to in the Merger Agreement or
this Agreement and shall use its best efforts to prevent the same or remedy the
same promptly.

     (d)   Financial Statements.
           -------------------- 

          (i)   Westamerica has delivered or shall deliver to Capitol prior
     to the Effective Date true and correct copies of consolidated
     statements of income, changes in shareholders' equity and statements
     of cash flows for the three (3) months ended March 31, 1994, June 30,
     1994, September 30, 1994, any subsequent quarter ends, and for the
     years ended December 31, 1993, 1992, 1991, 1990 and 1989, and
     consolidated balance sheets at March 31, 1994, June 30, 1994,
     September 30, 1994, any subsequent quarter ends, December 31, 1993,
     1992, 1991 and 1990. Such consolidated financial statements at and for
     the years ended December 31, 1993, 1992, 1991, 1990 and 1989 have been
     audited by KPMG Peat Marwick ("KPMG") and include an opinion of such
     accounting firm to the effect that such financial statements have been
     prepared in accordance with Generally Accepted Accounting Principles
     ("GAAP") and present fairly, in all material respects, the
     consolidated financial position, results of operations and cash flow
     of Westamerica at the dates indicated and for the periods then ending.
     The opinions of such accounting firm do not and shall not contain any
     qualifications.

          (ii)   Westamerica has provided or shall provide to Capitol at or
     prior to the Effective Date copies of all financial statements and
     proxy statements, issued or to be issued to Westamerica's shareholders
     and/or directors after December 31, 1993 and at or prior to the
     Effective Date.

          (iii)   Westamerica has provided or shall provide to Capitol prior
     to the Effective Date copies of (a) its Annual Report on Form 10-K for
     the years ended December 31, 1993 and 1992 as filed with the
     Securities and Exchange Commission (the "Commission"); (b) all
     periodic reports required to be filed by it pursuant to Sections 13(a)
     or 15(d) of the Securities Exchange Act of 1934, as amended (the "1934
     Act") since December 31, 1991; and (c) all proxy statements, annual
     reports and other written materials furnished to Westamerica
     shareholders since December 31, 1991, all other material reports
     relating to Westamerica filed by Westamerica or any of its
     subsidiaries with the California Superintendent of Banks
     ("Superintendent"), the FRB or the Commission during 1992, 1993, 1994
     and in 1995 prior to the Effective Date. As of their respective dates,
     each of the documents provided hereunder complied or will comply in
     all material respects with all legal and regulatory requirements
     applicable thereto.

     (e)   Press Releases.  Westamerica shall not issue any press release or
           --------------                                                   
written statement for general circulation to the public relating to the Merger,
this Agreement or the Merger Agreement unless 

                                      -6-
<PAGE>
 
previously provided to Capitol for review and approval (which approval will not
be unreasonably withheld or delayed) and shall cooperate with Capitol in the
development and distribution of all news releases and other public information
disclosures with respect to this Agreement or the Merger; provided that
Westamerica may, without the consent of Capitol, make any disclosure with regard
to this Agreement or the Merger that it determines is required under any
applicable law or regulation and shall provide a copy thereof to Capitol.

     (f)   Business Combinations.  Westamerica shall not make any offer to any
           ---------------------                                              
third party or accept any offer from any third party regarding a Business
Combination of Westamerica with any other entity unless such offer is expressly
conditioned upon the performance by Westamerica or its successor in interest of
all Westamerica's obligations under this Agreement.  In the event Westamerica
fails to comply with the provisions of this Section 3.1(f), Capitol shall be
entitled to terminate this Agreement without any liability to Westamerica or any
agent thereof pursuant to Section 12(b), provided, however, that the obligations
and liabilities of Westamerica set forth in Section 12(e) hereof shall continue
in full force and effect.  As used in this Agreement, "Business Combination"
shall mean any tender or exchange offer, proposal for a merger, consolidation,
or other takeover proposal involving any party hereto (except as explicitly
contemplated in this Agreement) or any offer or proposal to acquire in any
manner a 10% or greater equity interest in, or a substantial portion of any
party hereto other than transactions contemplated hereunder.

     (g)   Director & Officer Liability.  Upon the Effective Date, any Capitol
           ----------------------------                                       
executive officer who becomes an officer of Westamerica (including any
subsidiaries thereof) shall be included in Westamerica's Director & Officer
insurance policy.  Prior to the Effective Date, Capitol may purchase tail
insurance coverage under its current policies of directors' and officers'
liability insurance with respect to claims arising from facts or events which
occurred prior to the Effective Date, excluding Tyler v. Wickland and any
                                                -----------------        
related litigation; provided, however, that the total premium payment for such
insurance shall not exceed an amount which is reasonably acceptable to
Westamerica.  Upon the merger of Capitol into Westamerica Bank, Westamerica Bank
shall be deemed to assume the liabilities of Capitol under its director and
officer indemnification agreements.

     (h)   Extraordinary Dividends.  Prior to the Effective Date, Westamerica
           -----------------------                                           
shall not declare, set aside or pay any dividend or other distribution in
respect of its common stock (including, without limitation, any stock dividend
or distribution) other than regular quarterly dividends on its common stock in
amounts substantially equivalent to dividends paid in the pattern of
declarations and payments established in the 18 months prior to the date hereof
(it being understood that declaration of a quarterly dividend up to 2 cents per
share per quarter higher (on a cumulative basis) than the most recent previous
quarterly dividend will be deemed to meet this standard).  Nothing herein shall
prohibit the issuance of shares pursuant to Westamerica's Dividend Reinvestment
Plan or Amended Rights Agreement (as defined in Section 5(j) herein).

     3.2   Covenants of Capitol.
           --------------------

     (a)   Approval by Capitol Shareholders. Capitol shall cause the Merger, 
           --------------------------------
this Agreement and the Merger Agreement to be submitted promptly for the
approval of its shareholders at a special meeting to be called and held in
accordance with applicable laws. Subject to its continuing fiduciary duties to
the shareholders of Capitol, the Board of Directors of Capitol, in authorizing
the execution and delivery of this Agreement by Capitol, shall recommend that
this Agreement and the Merger be approved. Capitol shall use its best efforts to
cause such meeting of its shareholders to take place not later than March 1,
1995, subject to effectiveness of the Westamerica Registration Statement (as
defined in Section 6(a)(i)). In connection with the call of such meeting,
Capitol shall cause such proxy materials, with any amendments thereto that may
in the judgment of its counsel be necessary or desirable, to be mailed to its
shareholders (the proxy materials, together with any amendments or supplements
thereto, being herein referred to as the "Proxy Statement"). Subject to its
continuing fiduciary duties to the shareholders of Capitol, the Board of
Directors of Capitol shall at all times prior to and during such meeting of
Capitol shareholders recommend that the transactions contemplated hereby be
adopted and approved, and, subject to such fiduciary duties, use its best
efforts to cause such adoption and approval. Within 15 business days after the
time of execution and delivery of this Agreement, members of the Board of
Directors of Capitol shall deliver to Westamerica undertakings in the
                                      -7-
<PAGE>
 
form attached hereto as Exhibit C confirming such directors' approval of the
transactions contemplated hereby, setting forth such directors' commitment to
vote his shares of Capitol stock in favor of the transactions contemplated
hereby, setting forth such director's agreement pursuant to Section 3.1(g)
herein and setting forth such directors' commitment to use his best efforts to
cause the shareholders of Capitol to adopt and approve the transactions
contemplated hereby, subject to their above-mentioned continuing fiduciary
duties to the shareholders of Capitol. Except with the prior approval of
Westamerica, neither Capitol nor any member of its Board of Directors shall, at
the Capitol shareholders' meeting, submit any other matters for approval of its
shareholders, other than matters incidental to the conduct of such meeting.

     (b)   Shareholder Lists and Other Information.  After execution hereof,
           ---------------------------------------                          
Capitol shall from time to time make available to Westamerica, upon request, a
list of its shareholders and their addresses, a list showing all transfers of
the Capitol common stock and such other information as Westamerica shall
reasonably request regarding both the ownership and prior transfers of the
Capitol common stock.

     (c)   Government Approvals.  Capitol shall cooperate in all reasonable
           --------------------                                            
respects with Westamerica in its undertaking pursuant to Section 3.1(b) to
obtain the Government Approvals and Capitol further agrees, subject to the
continuing fiduciary duties of the Board of Directors of Capitol to the
shareholders of Capitol, to take such actions as may be reasonably requested by
Westamerica to cause the Merger to be consummated on the terms provided in the
Merger Agreement and this Agreement as promptly as is practicable.

     (d)   Capital Commitments and Expenditures.  After the execution of this
           ------------------------------------                              
Agreement, no new capital commitments in excess of $25,000 shall be entered
into, and no capital expenditures in excess of $25,000 shall be made by Capitol.
Capitol shall not create any new branches or, except as permitted pursuant to
Section 3.2(h), enter into any acquisitions or leases of real property,
including both new leases and lease extensions without the prior approval of
Westamerica.

     (e)   Notification of Breach of Representations, Warranties and Covenants.
           -------------------------------------------------------------------  
Capitol shall promptly give written notice to Westamerica upon becoming aware of
the occurrence or impending or threatened occurrence of any event which would
cause or constitute a breach of any of the representations, warranties or
covenants of Capitol contained or referred to in this Agreement and shall use
its best efforts to prevent the same or remedy the same promptly.

     (f)   Financial Statements.
           -------------------- 

          (i)    Capitol has delivered or shall deliver to Westamerica prior
     to the Effective Date true and correct copies of consolidated
     statements of income, changes in shareholders' equity and statements
     of cash flows for the three months ended March 31, 1994, June 30,
     1994, September 30, 1994, any subsequent quarter ends, and for the
     fiscal years ended December 31, 1993, 1992, 1991, 1990 and 1989 and
     consolidated balance sheets at March 31, 1994, June 30, 1994,
     September 30, 1994 and any subsequent quarter ends, December 31, 1993,
     1992, 1991, 1990 and 1989. Such consolidated financial statements at
     December 31, 1993, 1992, 1991, 1990 and 1989 and for the fiscal years
     ended December 31, 1993, 1992, 1991, 1990, and 1989 (and for the
     fiscal year ending December 31, 1994) have been or shall be audited by
     KPMG or Arthur Andersen in each case as independent public accountants
     for Capitol during the relevant periods, and include or shall include
     an opinion of such accounting firm to the effect that such financial
     statements have been prepared in accordance with GAAP and present
     fairly, in all material respects, the consolidated financial position,
     results of operations and cash flows of Capitol at the dates indicated
     and for the periods then ending. The opinions of such accounting firm
     do not and shall not contain any qualifications.

          (ii)    Capitol shall provide to Westamerica, at or prior to the
     Effective Date, copies of all financial statements and proxy statements
     issued or to be issued to Capitol's shareholders and/or directors after
     December 31, 1993, and at or prior to the Effective Date.

                                      -8-
<PAGE>
 
          (iii)  Capitol has delivered or shall deliver, to Westamerica true and
     complete copies of Capitol's Annual Report to Shareholders for the years
     ended December 31, 1989, 1990, 1991, 1992, 1993 and 1994, all periodic
     reports required to be filed by it pursuant to Section 13(a) or 15(d) of
     the 1934 Act since December 31, 1988, all proxy statements and other
     written material furnished to Capitol's shareholders since December 31,
     1988, and all other material reports, including call reports, relating to
     Capitol filed by Capitol with the Federal Deposit Insurance Corporation
     ("FDIC") or the Superintendent during 1990 through 1993 and in 1994 and
     1995 prior to the Effective Date. As of their respective dates, each of the
     documents described in the preceding sentence complied or shall comply in
     all material respects with all legal and regulatory requirements applicable
     thereto.

          (iv)   Capitol shall cause to be delivered to Westamerica letters of
     KPMG, Capitol's independent auditors, dated a date no more than two
     business days prior to the date on which the Westamerica Registration
     Statement shall become effective and two business days before the Closing
     and addressed to Westamerica, in form and substance reasonably satisfactory
     to Westamerica, and in scope and substance consistent with applicable
     professional standards for letters delivered by independent public
     accountants in connection with registration statements similar to the
     Westamerica Registration Statement.

   (g)    Compensation.  Capitol shall not make or approve any increase in the
          ------------                                                        
compensation payable or to become payable by Capitol to any of their directors,
officers, employees or agents with annual salaries in excess of $40,000 at the
date hereof (including but not limited to compensation through any profit
sharing, pension, retirement, severance, incentive or other employee benefit
program or arrangement), nor shall any bonus payment or any agreement or
commitment to make a bonus payment be made (except with Westamerica's prior
approval which shall not be unreasonably withheld), nor shall any stock option,
warrant or other right to acquire capital stock be granted, or employment
agreement (other than any such employment agreement that may arise by operation
of law upon the hiring of any new employee) or consulting agreement be entered
into by Capitol with any such directors, officers, employees or agents unless
Westamerica has given its prior written consent. Nothing herein shall prevent
the payment to Capitol employees (with salaries of $40,000 or less at the date
hereof) of regular salary increases, consistent with past practices in
connection with regular salary reviews consistent with past practices, as
heretofore disclosed to Westamerica. Without the prior consent of Westamerica,
Capitol shall not hire any new employee at an annual rate in excess of current
customary practice or, in any event, in excess of $40,000 per year, except with
the prior written consent of Westamerica.

   (h)    Conduct of Business in the Ordinary Course.  Prior to the Effective
          ------------------------------------------                         
          Time:

          (i)    Capitol shall conduct its businesses in the ordinary course as
     heretofore conducted. For purposes of this Agreement, the "Ordinary Course
     of Business" shall consist of the banking and related businesses as
     presently conducted by Capitol and permitted under the California Financial
     Code, the Federal Deposit Insurance Act and other applicable laws. Unless
     Westamerica has given its previous written consent to any act or omission
     to the contrary, Capitol shall, through the Effective Date, cause their
     respective officers to:

          A.    use their best efforts to preserve its business and business
     organizations intact;

          B.    use their best efforts to preserve the goodwill of customers
     and others having business relations with it and take no action that would
     materially impair the benefit to Westamerica of the goodwill of Capitol, or
     the other benefits of the Merger;

          C.    consult with Westamerica as to the making of any decisions or
     the taking of any actions in matters other than in the Ordinary Course of
     Business;

                                      -9-
<PAGE>
 
           D.    maintain its properties in customary repair, working order and
     condition (reasonable wear and tear excepted);

           E.    comply in all material respects with all laws, regulations and
     decrees applicable to the conduct of its business;

           F.    keep in force at not less than its present limits all policies
     of insurance (including deposit insurance of the FDIC) to the extent
     reasonably practicable in light of the prevailing market conditions in the
     insurance industry;

           G.    use its best efforts, subject to Section 3.2(g), to keep
     available to Westamerica the services of its present officers and employees
     (it being understood that Capitol shall have the right to terminate the
     employment of any officer or employee in accordance with its established
     employment procedures);

           H.    comply with all orders, agreements and memoranda of
     understanding made by or with the FDIC, the State Banking Department
     ("SBD"), or any other regulatory authority of competent jurisdiction, and
     promptly forward to Westamerica all communications received from any such
     authority that are not prohibited by such authority from being so disclosed
     and inform Westamerica of any material restrictions imposed by any
     governmental authority on the business of Capitol;

           I.    file in a timely manner (taking into account any extensions
     duly obtained) all reports, tax returns and other documents required to be
     filed with federal, state, local and other authorities;

           J.    conduct a phase I environmental audit prior to foreclosure on
     any real property concerning which Capitol has knowledge that asbestos or
     asbestos-containing materials, PCB's or PCB-contaminated materials, any
     petroleum product, or hazardous substance or waste (as defined under any
     applicable environmental laws) was or is present, manufactured, recycled,
     reclaimed, released, stored, treated, or disposed of, and provide the
     results of such audit to and consult with Westamerica regarding the
     significance of the audit prior to the foreclosure on any such property;

           K.    not sell, lease, pledge, assign, encumber or otherwise dispose
     of any of its assets except in the Ordinary Course of Business, for
     adequate value, without recourse and consistent with its customary
     practice;

           L.    with respect to any extension of credit in excess of $10,000,
     not waive or release any right or collateral or cancel or compromise any
     debt or claim, except in the Ordinary Course of Business;

           M.    not make, renegotiate, renew, increase, extend or purchase any
     loans, advances or loan commitments, in each case to any of its officers,
     directors or any affiliated or related persons of such directors or
     officers except in the Ordinary Course of Business consistent with its
     established loan procedures and in compliance with FRB Regulation O;

           N.    not take any action to create, relocate or terminate the
     operations of any banking office or branch, or to form any new subsidiary
     or affiliated entity;

           O.    not settle or otherwise take any action to release or reduce
     any of its rights with respect to any litigation involving a claim of more
     than $10,000 in which it is a party;

                                     -10-
<PAGE>
 
           P.    consult with Westamerica on problem loan workout strategies,
     and obtain Westamerica's concurrence on any loan loss in excess of $25,000
     or any writedown of other real estate owned.

           (ii)  Capitol shall not, without first having obtained the written
     consent of Westamerica, cause the officers of Capitol to:

           A.    commit to any loan with a principal amount in excess of $50,000
     provided that Westamerica's consent shall be deemed given unless it objects
     and states the basis of its objection in writing, or verbally with prompt
     written confirmation, within two business days after receipt of written
     notice directed to authorized Westamerica personnel, together with
     sufficient supporting information to allow Westamerica to make an informed
     judgment, and Westamerica shall not unreasonably withhold its consent;
     provided, further, that any consent given by Westamerica shall be binding
     only if given by Westamerica personnel identified on a list signed by
     Westamerica's President;

           B.    purchase any investment security with a maturity in excess of
     two years, or sell any investment security in which a gain is recognized;

           C.    issue any certificate of deposit with a rate of interest in
     excess of 6%;

           D.    commit to new capital commitments or expenditures in excess of
     $25,000;

           E.    commit to any new contract or extend any existing contract that
     would obligate Capitol for an aggregate amount over time in excess of
     $25,000 except pursuant to Section 3.2(l), (including data processing,
     servicing or any other agreement or contract);

           F.    accelerate the vesting of pension or other benefits;

           G.    grant any new stock options or accelerate the vesting of any
     existing stock options; or

           H.    Fail to promptly notify Westamerica in writing upon becoming
     aware of the occurrence of any of the following:

                 (1)   the classification of any loan as substandard, doubtful
          or loss;

                 (2)   the filing or commencement of any legal action or other
          proceeding or investigation against Capitol (or any director or
          executive officer); or

                 (3)   the monthly pretax earnings of Capitol are less than
          $50,000.

     (i)   Press Releases.  Capitol shall not issue any press release or written
           --------------                                                       
statement for general circulation relating to this Agreement or the Merger
unless previously provided to Westamerica for review and approval (which
approval will not be unreasonably withheld or delayed) and shall cooperate with
Westamerica in the development and distribution of all news releases and other
public information disclosures with respect to this Agreement or the Merger;
provided that Capitol may, without the consent of Westamerica, make any
disclosure with regard to this Agreement or the Merger that it determines is
required under any applicable law or regulation and shall provide a copy thereof
to Westamerica.

                                     -11-










<PAGE>
 
 
     (j)  No Merger or Solicitation.
          ------------------------- 

          (i)    Subject to the continuing fiduciary duties of the Board of
     Directors of Capitol to the shareholders of Capitol, prior to the Effective
     Time, Capitol shall not effect or agree to effect any Business Combination
     (as defined in Section 3.1(f)), acquire or agree to acquire any of its own
     capital stock or the capital stock (except in a fiduciary capacity) or
     assets (except in the Ordinary Course of Business) of any other entity, or
     commence any proceedings for winding up and dissolution affecting either of
     them.

          (ii)   Subject to the continuing fiduciary duties of the Board of
     Directors of Capitol to the shareholders of Capitol, prior to the Effective
     Date, neither Capitol, nor any officer, director or affiliate of Capitol,
     nor any investment banker, attorney, accountant or other agent, advisor or
     representative retained by Capitol shall (A) solicit or encourage, directly
     or indirectly, any inquiries, discussions or proposals for, continue,
     propose or enter into discussions or negotiations looking toward, or enter
     into any agreement or understanding providing for, any Business
     Combination; or (B) disclose, directly or indirectly, any nonpublic
     information to any corporation, partnership, person or other entity or
     group concerning the business and properties of Capitol or afford any such
     party access to the properties, books or records of Capitol or otherwise
     assist or encourage any such party in connection with the foregoing, or (C)
     furnish or cause to be furnished any information concerning the business,
     financial condition, operations, properties or prospects of Capitol to
     another person, having any actual or prospective role with respect to any
     such transaction; provided, however, that with respect to any investment
     banker, Capitol shall use its best efforts to ensure that said investment
     banker complies with the foregoing.

          (iii)  Capitol shall notify Westamerica of the details of any
     indication of interest of any person, corporation, firm, association or
     group to acquire by any means a controlling interest in Capitol or engage
     in any Business Combination with Capitol within two business days of any
     such indication of interest.

          (iv)   In the event the Board of Directors of Capitol receives a bona
     fide offer for a Business Combination with another entity, and reasonably
     determines, upon advice of counsel, that as a result of such offer, any
     duty to act or to refrain from doing any act pursuant to this Agreement is
     inconsistent with the continuing fiduciary duties of said Board of
     Directors to the shareholders of Capitol, such failure to act or refrain
     from doing any act shall not constitute the failure of any condition,
     breach of any covenant or otherwise constitute any breach of this
     Agreement, provided, however, that any such failure to act or refrain from
     doing any act shall entitle Westamerica to terminate this Agreement
     pursuant to Section 12(b) and provided further, that the obligations and
     liabilities of Capitol set forth in Section 12(e) hereof shall continue in
     full force and effect but neither Capitol nor its officers, directors or
     agents shall have any further liability with regard thereto for any failure
     to act or omission of any act pursuant to this subsection (iv).

     (k)  Capitol 401(k) Plan.  Capitol agrees the Capitol 401(k) Plan (the
          -------------------                                              
"Plan") may be terminated, frozen, modified or merged into the Westamerica
401(k) Plan immediately before, on or after the Effective Date, as determined by
Westamerica in its sole discretion, subject to compliance with applicable law.

     (l)  Outsourcing to Westamerica.  Capitol shall endeavor to, and cooperate
          --------------------------                                           
with Westamerica to, outsource various Capitol banking functions to Westamerica,
provided that such outsourcing does not impair the independence of Capitol.
These functions include, but are not limited to, item processing, data
processing, loan documentation, facilities management, investment portfolio
management, loan review, internal audit and account servicing.  Arm's-length
contracts between Capitol and Westamerica to document these outsourcing
arrangements shall include appropriate compensation for services provided, as
well as provisions to terminate the contracts as appropriate, for example, if
this Agreement is terminated.  In the event of termination, 

                                     -12-
<PAGE>
 
Westernamercia agrees to cooperate in an orderly transition back to a 
satisfactory operating condition of these functions by Capitol.
 
     (m)   Changes in Capital Stock.  At or after the date hereof and at or 
           ------------------------
prior to the Effective Time, except with the prior written consent of
Westamerica, Capitol shall not amend its Articles of Incorporation or Bylaws;
make any change in its authorized, issued or outstanding capital stock or any
other equity security; issue, sell, pledge, assign or otherwise encumber or
dispose of, or purchase, redeem or otherwise acquire, any of its shares of
capital stock or other equity securities or enter into any agreement, call or
commitment of any character so to do; grant or issue any stock option relating
to, right to acquire, or security convertible into, shares of its capital stock
or other equity security; purchase, redeem, retire or otherwise acquire (other
than in a fiduciary capacity) any shares of, or any security convertible into,
its capital stock or other equity securities, or agree to do any of the
foregoing, except that nothing herein shall prohibit the execution of the Stock
Option Agreement or issuance of shares pursuant to the Option Plan with respect
to options outstanding at the date of this Agreement (except as limited in
Section 2.6).

     (n)   Dividends. Capitol shall not declare, set aside or pay any dividend
           ---------
or other distribution in respect of its common stock (including, without
limitation, any stock dividend or distribution).

     (o)   Accounting Methods. Capitol shall not change its methods of        
           ------------------ 
accounting in effect at December 31, 1993, except as required by changes 
in GAAP as concurred in by its independent auditors. 

     (p)   Affiliates.  On the date hereof and at least 40 days prior to the
           ----------                                                       
Closing, Capitol shall deliver to Westamerica a letter identifying all persons
who are "affiliates" of Capitol for purposes of Rule 145 under the 1933 Act.
Capitol shall use all reasonable efforts to cause each person named in the
letter delivered by it to deliver to Westamerica prior to the Closing a written
"affiliates" agreement, in substantially the form attached hereto as Exhibit E,
providing that such person shall dispose of the Westamerica Common Stock to be
received by such person in the Merger only in accordance with applicable law
and, in addition, in such agreement, such affiliate shall represent that they
have no present plan or intention to dispose of any such shares of Westamerica
Common Stock.

     (q)   Additional Agreements.  In case at any time after the Effective Time
           ---------------------                                               
any further action is necessary or desirable to carry out the purposes of this
Agreement or to vest the Surviving Corporation with full title to all
properties, assets, rights, approvals, immunities and franchises of Capitol, the
proper officers and directors of each party to this Agreement shall take all
such necessary or appropriate action.

     (r)   Access to Properties, Books and Records; Confidentiality. Prior     
           --------------------------------------------------------  
to the Effective Time, Capitol shall give Westamerica and its counsel and
accounts full access, during normal business hours and upon reasonable request,
accounts its properties, books, contracts, commitments and records including,
but not limited to, the corporate, financial and operational records, papers,
reports, instructions, procedures, tax returns and filings tax settlement
letters, material contracts or commitments, regulatory examinations and
correspondence and shall allow Westamerica to make copies of such materials (to
the extent not legally prohibited) and shall furnish Westamerica with all such
information concerning its affairs as Westamerica may reasonably request.
Capitol shall also use its best efforts to cause KPMG to make available to
Westamerica, its accountants, counsel and other agents, to the extent reasonably
requested in connection with such review, KPMG's work papers and documentation
relating to its work papers and its audits of the books and records of Capitol.

     (s)   Employee Welfare Benefit Plans. Capitol agrees that Capitol's 
           ------------------------------
employee welfare benefit plans, as defined in Section 3(1) of Employee
Retirement Income Security Act of 1974, as amended ("ERISA"), may be terminated,
modified or merged into Westamerica's welfare benefit plans before, on or after
the Effective Date, as determined by Westamerica in its sole discretion, subject
to compliance with applicable law.

                                     -13-
<PAGE>
 
    (t)   Execution and Delivery of Stock Option Agreement.  The parties agree
          ------------------------------------------------                    
that the Stock Option Agreement shall be executed and delivered immediately
following the execution and delivery of this Agreement.

    (u)   Noncompetition Agreements.  Capitol shall use its best efforts to have
          -------------------------                                             
each nonofficer director listed on Exhibit F hereto execute a noncompetition
agreement substantially in the form attached hereto as Exhibits B or B-1.

    (v)   Litigation Developments. Capitol agrees to promptly advise Westamerica
          -----------------------                                              
with respect to any and all material legal actions or other proceedings or
investigations and to promptly advise Westamerica with respect to any
significant developments arising in connection with said actions, proceedings or
investigations including but not limited to information concerning the matter
known as Tyler v. Wickland.
         ----------------- 

    (w)   Net Operating Loss Carryforward.  Capitol shall cooperate with
          -------------------------------                               
Westamerica and use its reasonable efforts to cause Capitol's independent
auditor to cooperate with Westamerica in order to allow Westamerica to obtain,
to the extent possible, any of Capitol's net operating loss carryforwards and
tax credit carryforwards.

    3.3   Covenants of the Parties.  Each party shall use its best efforts to
          ------------------------                                           
cause its officers, directors, employees, auditors, agents, and attorneys to
cooperate with the other in the reasonable requests for information by the other
parties hereto. Each party shall treat as confidential all such information in
the same manner as each party treats similar confidential information of its
own, and if this Agreement is terminated, each party shall continue to treat all
such information as confidential and to cause its employees to keep all such
information confidential and shall return such documents theretofore delivered
by the other party as the other party shall request, and shall use such
information, or cause it to be used, solely for the purposes of evaluating and
completing the transactions contemplated hereby; provided that each party may
disclose any such information to the extent required by federal or state
securities laws or otherwise required by any governmental agency or authority,
or by generally accepted accounting principles. The foregoing confidentiality
obligations shall not apply in respect of any information publicly available or
to any information previously known to the party in question, the use of which
is not otherwise restricted.


    4.    REPRESENTATIONS AND WARRANTIES OF CAPITOL.
          ----------------------------------------- 

     Capitol represents and warrants to Westamerica, except with respect to
subsections (c), (d), (f), (g), (i), (j), (k), (l), (m), (n), (o), (p), (q), (u)
and (w) of this Section 4 if disclosed to Westamerica in writing within 10 days
after the date hereof (the "Capitol Disclosure Statement"), that:

    (a)   Corporate Status and Power to Enter Into Agreements.  Capitol (i) is a
          ---------------------------------------------------                   
state chartered bank duly incorporated, validly existing and in good standing
under the laws of California, (ii) subject to the approval of this Agreement and
the transactions contemplated hereby by the shareholders of Capitol, the SBD and
the FDIC, it has all necessary corporate power to enter into this Agreement and
to carry out all of the terms and provisions hereof and thereof to be carried
out by it, (iii) holds a currently valid license issued by the SBD to engage in
the commercial banking business in California at its banking offices, and (iv)
is not subject to any directive, order (formal or informal) or agreement, of the
FDIC, the SBD or any other regulatory authority having jurisdiction over its
business or any of its assets or properties, and (iv) is in full compliance with
any agreements, understandings or orders of the SBD, the FDIC, or any other
regulatory authority having jurisdiction over its business or any of its assets
or properties.  Neither the scope of the business of Capitol nor the location of
its properties requires it to be licensed to do business in any jurisdiction
other than the State of California.

    (b)   Articles, Bylaws, Books and Records.  The copies of the Articles of
          -----------------------------------                                
Incorporation and Bylaws of Capitol to be delivered to Westamerica prior to the
date hereof are complete and accurate copies thereof as in effect on the date
hereof.  The minute books of Capitol made available to Westamerica contain a

                                     -14-
<PAGE>
 
complete and accurate record of all meetings of the Board of Directors (and
committees thereof) and shareholders.  The corporate books and records
(including financial statements) of Capitol fairly reflect the material
transactions to which Capitol is a party or by which its properties are subject
or bound, and such books and records have been properly kept and maintained.
The Articles of Incorporation and Bylaws of Capitol and all amendments thereto
have been duly approved by all requisite corporate action and by the appropriate
regulatory authority to the extent required by law.

    (c)   Compliance With Laws, Regulations and Decrees.  Capitol (i) has the
          ---------------------------------------------                      
corporate power to own or lease its properties and to conduct its business as
currently conducted, (ii) has complied with, and is not in default of any laws,
regulations, ordinances, orders or decrees applicable to the conduct of its
business and the ownership of its properties, including but not limited to all
federal and state laws (including but not limited to the Bank Secrecy Act),
rules and regulations relating to the offer, sale or issuance of securities, and
the operation of a commercial bank, other than where such noncompliance or
default is not likely to result in a material limitation on the conduct of its
business or is not likely to otherwise have a material adverse effect on Capitol
taken as a whole (iii) has not failed to file with the proper federal, state,
local or other authorities any material report or other document required to be
so filed, (iv) has all material approvals, authorizations, consents, licenses,
clearances and orders of, and have currently effective all registrations with,
all governmental and regulatory authorities which are necessary to the business
and operations of Capitol as now being conducted, and (v) has received no
notification, formally or informally, from any agency or department of any
federal, state or local government or any regulatory agency or the staff thereof
(A) asserting that Capitol is not in material compliance with any of the
statutes, regulations or ordinances which such government or regulatory
authority enforces, or (B) threatening to revoke any licenses, franchise, permit
or governmental authorization of Capitol.

    (d)   Capitalization.  The authorized capital stock of Capitol consists of
          --------------                                                      
10,000,000 shares of Capitol common stock, no par value, of which 4,080,302 are
duly authorized, validly issued, fully paid and nonassessable and currently
outstanding.  Said stock has been issued in compliance with all applicable
registration or qualification provisions of state and federal securities laws.
No other equity securities of Capitol have been issued or are outstanding.
There are currently outstanding options to purchase 319,467 shares of Capitol
common stock, at a weighted average exercise price of $1.58 per share, issued
pursuant to the Option Plan.  Said options were issued and, upon issuance in
accordance with the terms of the outstanding options said shares shall be
issued, in compliance with all applicable securities laws.  Other than the Stock
Option Agreement contemplated hereby there are no outstanding (i) options,
agreements, calls or commitments of any character which would obligate Capitol
to issue, sell, pledge, assign or otherwise encumber or dispose of, or to
purchase, redeem or otherwise acquire, any Capitol common stock or any other
equity security of Capitol, or (ii) warrants or options relating to, rights to
acquire, or debt or equity securities convertible into, shares of Capitol common
stock or any other equity security of Capitol.  Attached to the Capitol
Disclosure Statement is a list of all option holders and the number of vested
and unvested options as of September 30, 1994.  The outstanding common stock of
Capitol has been duly and validly registered with the Commission pursuant to the
1934 Act, to the extent required thereunder.

    (e)   Equity Interests.  Except as listed below or as collateral for
          ----------------                                              
outstanding loans held in its loan portfolio, Capitol does not own, directly or
indirectly, any equity interest in any bank, corporation, or other entity.


             -None-


    (f)   Financial Statements, Regulatory Reports.  No financial statement or
          ----------------------------------------                            
other document provided or to be provided to Westamerica as required by Section
3.2(f) hereof, as of the date of such document, contained, or as to documents to
be delivered after the date hereof, will contain, any untrue statement of a
material fact, or, at the date thereof, omitted or will omit to state a material
fact necessary in order to make the statements contained therein, in light of
the circumstances under which such statements were or will be made, not
misleading; provided, however, that information as of a later date shall be
deemed to modify information as of any earlier date.  Capitol has filed all
material documents and reports relating to

                                     -15-
<PAGE>
 
Capitol required to be filed by it with the SBD, the Commission, the FDIC, or
any other governmental authority having jurisdiction over its business or any of
its assets or properties. All such reports conform in all material respects with
the requirements promulgated by such regulatory agencies. All compliance or
corrective action relating to Capitol required by governmental authorities and
regulatory agencies having jurisdiction over Capitol have been taken. Capitol
has not received notification, formally or informally, from any agency or
department of any federal, state or local government or any regulatory agency or
the staff thereof (A) asserting that Capitol is not in compliance with any of
the statutes, regulations or ordinances which such government or regulatory
authority enforces, or (B) threatening to revoke any license, franchise, permit
or governmental authorization of Capitol. Capitol is not subject to any order,
agreement or written directive with any regulatory authority with respect to its
assets or business except for matters of general application. Capitol has paid
all assessments made or imposed by any governmental agency. Capitol shall
deliver to Westamerica copies of all annual management letters and opinions, and
shall make available to Westamerica for inspection all reviews, correspondence
and other documents in the files of Capitol prepared by KPMG or any other
certified public accountant engaged by Capitol and delivered to Capitol since
January 1, 1988. The consolidated financial records of Capitol have been, and
are being and shall be, maintained in all material respects in accordance with
all applicable legal and accounting requirements sufficient to insure that all
transactions reflected therein are, in all material respects, executed in
accordance with management's general or specific authorization and recorded in
conformity with GAAP at the time in effect. The data processing equipment,
data transmission equipment, related peripheral equipment and software used by
Capitol in the operation of its business to generate and retrieve its financial
records are adequate for the current needs of Capitol.

     (g)  Tax Returns.
          ----------- 

          (i)     Capitol has timely filed all federal, state, county, local and
     foreign tax returns required to be filed by it, including, without
     limitation, estimated tax, use tax, excise tax, real property and personal
     property tax reports and returns, employer's withholding tax returns, other
     withholding tax returns and Federal Unemployment Tax Returns, and all other
     reports or other information required or requested to be filed by each of
     them, and each such return, report or other information was, when filed,
     complete and accurate in all material respects.  Capitol has paid all
     taxes, fees and other governmental charges, including any interest and
     penalties thereon, when they have become due and payable, except those that
     are being contested in good faith, which contested matters have been
     disclosed in writing to Westamerica.  Capitol has not requested to give or
     has given any currently effective waivers extending the statutory period of
     limitation applicable to any tax return required to be filed by either of
     them for any period.  There are no claims pending against Capitol for any
     alleged deficiency in the payment of any taxes, and no pending or
     threatened audits, investigations or claims for unpaid taxes or relating to
     any liability in respect of any taxes.  There have been no events,
     including a change in ownership, that would result in a reappraisal and
     establishment of a new base-year full value for purposes of Articles XIII.A
     of the California Constitution, of any real property owned in whole or in
     part by Capitol or to the best of Capitol's knowledge, of any real property
     leased by Capitol.

          (ii)   Capitol shall deliver to Westamerica when available, copies of
     all its and its subsidiaries' tax returns with respect to taxes payable to
     the United States of America and the State of California for the fiscal
     years ended December 31, 1994, 1993, 1992, 1991 and 1990.

          (iii)  No consent has been filed relating to Capitol pursuant to
     Section 341(f) of the IRC.

     (h)  Material Adverse Change.  Except as reflected on Capitol's financial
          -----------------------                                             
statements issued prior to the date hereof and delivered to Westamerica or as
otherwise disclosed in writing by Capitol to Westamerica prior to the date
hereof, since December 31, 1993, there has been (i) no material adverse change

                                     -16-
<PAGE>
 
in the business, assets, licenses, permits, franchises, results of operations or
financial condition of Capitol taken as a whole (whether or not in the ordinary
course of business), (ii) no change in any of the assets, licenses, permits or
franchises of Capitol or that has had or, to Capitol's knowledge, can reasonably
be expected to have a material adverse effect on any of the items listed in
clause (h)(i) above, (iii) no damage, destruction, or other casualty loss
(whether or not covered by insurance) that has had or can reasonably be expected
to have a material adverse effect on any of the items listed in clause (h)(i)
above, (iv) no amendment, modification, or termination of any existing, or
entering into of any new, contract, agreement, plan, lease, license, permit or
franchise that is material to the business, financial condition, assets,
liabilities or operations of Capitol taken as a whole, except in the Ordinary
Course of Business; (v) no disposition by Capitol of one or more assets that,
individually or in the aggregate, are material to Capitol taken as a whole,
except sales of assets in the Ordinary Course of Business.

     (i)   No Undisclosed Liabilities.  Except for items for which reserves have
           --------------------------                                           
been established in the unaudited consolidated balance sheets of Capitol as of
September 30, 1994, since such date Capitol has not incurred or discharged, and
is not legally obligated with respect to, any indebtedness, liability
(including, without limitation, a liability arising out of an indemnification,
guarantee, hold harmless or similar arrangement) or obligation (accrued or
contingent, whether due or to become due, and whether or not subordinated to the
claims of its general creditors), other than as a result of operations in the
Ordinary Course of Business.  No agreement pursuant to which any loans or other
assets have been or will be sold by Capitol entitle the buyer of such loans or
other assets, unless there is material breach of a representation or covenant by
Capitol, to cause Capitol to repurchase such loan or other asset or to pursue
any other form of recourse against Capitol.  Capitol has not knowingly made nor
shall make any representations or covenants in any such agreement that contained
or shall contain any untrue statement of a material fact or omitted or shall
omit to state a material fact necessary in order to make the statements
contained therein, in light of the circumstances under which such
representations and/or covenants were made or shall be made, not misleading.  No
cash, stock or other dividend or any other distribution with respect to the
stock of Capitol has been declared, set aside or paid, nor have any shares of
the stock of Capitol been purchased, redeemed or otherwise acquired, directly or
indirectly, by Capitol since September 30, 1994.

     (j)   Properties and Leases.
           --------------------- 

            (i)     Capitol has good and marketable title, free and clear of all
     liens and encumbrances and the right of possession, subject to existing
     leaseholds, to all real properties and good title to all other property and
     assets, tangible and intangible, reflected in the Capitol consolidated
     balance sheet as of September 30, 1994 (except property held as lessee
     under leases entered into since September 30, 1994 and disclosed in writing
     prior to the date hereof and except personal property sold or otherwise
     disposed of since September 30, 1994 in the Ordinary Course of Business),
     except (a) liens for taxes or assessments not delinquent, (b) such other
     liens and encumbrances and imperfections of title as do not materially
     affect the value of such property as reflected in the Capitol consolidated
     balance sheet as of September 30, 1994, or as currently shown on the books
     and records of Capitol and which do not interfere with or impair the
     present and continued use, or (c) immaterial exceptions disclosed in title
     reports and preliminary title reports, copies of which shall be provided to
     Westamerica. All tangible properties of Capitol conform in all material
     respects with all applicable ordinances, regulations and zoning laws. All
     material tangible properties of Capitol are in a good state of maintenance
     and repair and are adequate for the current business of Capitol. No
     properties of Capitol and, to the best of Capitol's knowledge, no
     properties in which it holds a collateral or contingent interest or
     purchase option, are the subject of any pending or to the best of Capitol's
     knowledge, threatened investigation, claim or proceeding relating to the
     use, storage or disposal on such property of or contamination of such
     property by any toxic or hazardous waste material or substance. To
     Capitol's knowledge, Capitol does not own, possess or have a collateral or
     contingent interest or purchase option in any properties or other assets
     which contain or have located within or thereon any hazardous or toxic
     
                                     -17-
<PAGE>
 
     waste material or substance unless the location of such hazardous or toxic
     waste material or other substance or its use thereon conforms in all
     material respects with all federal, state and local laws, rules,
     regulations or other provisions regulating the discharge of materials into
     the environment.  As to any asset not owned or leased by Capitol, to the
     best of Capitol's knowledge, Capitol has not controlled, directed or
     participated in the operation or management of any such asset or any
     facilities or enterprise conducted thereon, such that it has become an
     owner or operator of such asset under applicable environmental laws.

          (ii)   All properties held by Capitol under leases are held under
     valid, binding and enforceable leases, with such exceptions as are not
     material and do not interfere with the conduct of the business of Capitol,
     and Capitol enjoys quiet and peaceful possession of such leased property.
     Capitol is not in default in any material respect under any material lease,
     agreement or obligation regarding its properties to which it is a party or
     by which it is bound. 

          (iii)   Except as disclosed to Westamerica in the Capitol Disclosure
     Statement, all of Capitol's rights and obligations under the leases
     referred to in Section 4(j)(ii) above do not require the consent of any
     other party to the transaction contemplated by this Agreement. Where
     required, Capitol shall use its best efforts to obtain, prior to the
     Effective Date, the consent of all parties to any such transactions.

     (k)  Material Contracts.  Except as disclosed to Westamerica in the Capitol
          ------------------                                                    
Disclosure Statement and excluding loans, lines of credit, loan commitments or
letters of credit to which Capitol is a party, Capitol is not a party to or
bound by any contract or other agreement made in the Ordinary Course of Business
which involves aggregate future payments by or to it of more than $50,000 and
which is made for a fixed period expiring more than one year from the date
hereof, and Capitol is not a party to or bound by any agreement not made in the
Ordinary Course of Business which is to be performed at or after the date
hereof.  Each of the contracts and agreements disclosed to Westamerica pursuant
to this Section 4(k) is a legal and binding obligation (subject to applicable
bankruptcy, insolvency and similar laws affecting creditors' rights generally
and subject, as to enforceability, to equitable principles of general
applicability), and no material breach or default (and no condition which, with
notice or passage of time, or both, could become a breach or default) exists
with respect thereto.  No power of attorney or similar authorization given
directly or indirectly by Capitol is currently outstanding.

     (l)  Classified Loans.  Except as disclosed to Westamerica in the Capitol
          ----------------                                                    
Disclosure Statement, there are no loans presently owned by Capitol that have
been classified by any bank examiner, outside loan reviewer, accountant or the
management of Capitol as "Other Loans Especially Mentioned," "Substandard,"
"Doubtful," or "Loss" or classified using categories with similar import and all
loans or portions thereof classified "Loss" have been charged off.
Notwithstanding the above, Capitol shall be under no obligation to disclose to
Westamerica any such classification by any bank examiner where such disclosure
would violate any obligation of confidentiality of Capitol imposed by the SBD,
the FDIC, or any other bank regulator.  Capitol regularly reviews and
appropriately classifies loans in accordance with all applicable legal and
regulatory requirements and generally accepted banking practices.  All loans and
investments of Capitol are legal, valid and binding obligations enforceable in
accordance with their respective terms and are not subject to any setoffs,
counterclaims or disputes (subject to applicable bankruptcy, insolvency and
similar laws affecting creditors' rights generally and subject, as to
enforceability, to equitable principles of general applicability), except as
disclosed to Westamerica in the Capitol Disclosure Statement or reserved for in
the unaudited consolidated balance sheet of Capitol as of September 30, 1994,
and were duly authorized under and made in material compliance with applicable
federal and state laws and regulations.  Capitol does not have any extensions of
credit, investments, guarantees, indemnification agreements or commitments for
the same (including without limitation commitments to issue letters of credit,
to create acceptances, or to repurchase securities, federal funds or other
assets) other than those documented on the books and records of Capitol.

     (m)  Restrictions on Investments.  Except for pledges to secure public and
          ---------------------------                                          
trust deposits and repurchase agreements in the Ordinary Course of Business,
none of the investments reflected in the Capitol 

                                     -18-

<PAGE>
 

consolidated balance sheet as of September 30, 1994, and none of the investments
made by Capitol since September 30, 1994, is subject to any restriction, whether
contractual or statutory, which materially impairs the ability of Capitol freely
to dispose of such investment at any time.

     (n)  Employment Contracts and Benefits.
          --------------------------------- 

          (i)   Capitol has delivered to Westamerica an accurate list setting
     forth all bonus, incentive compensation, profit-sharing, pension,
     retirement, stock purchase, stock option, deferred compensation, severance,
     hospitalization, medical, dental, vision, group insurance, death benefits,
     disability and other fringe benefit plans, trust agreements, arrangements
     and commitments of Capitol (including but not limited to such plans,
     agreements, arrangements and commitments applicable to former employees or
     retired employees, or for which such persons are eligible), if any,
     together with copies of all such plans, agreements, arrangements and
     commitments that are documented, any and all contracts of employment and
     has made available to Westamerica any Board of Directors' minutes (or
     committee minutes) from meetings held within the five-year period ending as
     of the Closing authorizing, approving or guaranteeing such plans and
     contracts.

          (ii)   With respect to each employee benefit plan (as defined in
     Section 3(3) of ERISA) which is listed in Subsection (n) and which is
     subject to the reporting, disclosure and record retention requirements set
     forth in the IRC and Part 1 of Subtitle B of Title I of ERISA and the
     regulations thereunder, each of such requirements has been fully met on a
     timely basis.

          (iii)   With respect to each employee benefit plan (as defined in
     Section 3(3) of ERISA) which is listed in Subsection (n) and which is
     subject to Part 4 of Subtitle B of Title I of ERISA, none of the following
     now exists or has existed within the six-year period ending on the date
     hereof:

          (1)     Any act or omission constituting a material violation of
     Section 402 of ERISA;

          (2)     Any act or omission constituting a violation of Section 403 of
     ERISA;

          (3)     Any act or omission by Capitol or any of its subsidiaries, or
     by any director, officer or employee thereof, constituting a violation of
     Sections 404 and 405 of ERISA;

          (4)     To the best of Capitol's knowledge, any act or omission by any
     other person constituting a violation of Sections 404 or 405 of ERISA;

          (5)     Any act or omission which constitutes a material violation of
     Sections 406 or 407 of ERISA and is not exempted by Section 408 of ERISA or
     which constitutes a violation of Section 4975(c) of the IRC and is not
     exempted by Section 4975(d) of the IRC; or

          (6)     Any act or omission constituting a violation of Sections 503,
     510 or 511 of ERISA.

          (iv)    All contributions, premiums or other payments due from Capitol
     and its subsidiaries to (or under) any plan listed in subsection (n) have
     been fully paid or adequately provided for on the Audited Financials for
     the year ended December 31, 1993 and period ended June 30, 1994. All
     accruals thereon (including, where appropriate, proportional 

                                     -19-
<PAGE>
 
     accruals for partial periods) have been made in accordance with GAAP
     consistently applied on a reasonable basis.

          (v)     Each plan listed in subsection (n) complies in all material
     respects with all applicable requirements of (A) the Age Discrimination in
     Employment Act of 1967, as amended, and the regulations thereunder and (B)
     Title VII of the Civil Rights Act of 1964, as amended, and the regulations
     thereunder.

          (vi)    Each plan listed in subsection (n) complies in all material
     respects with all applicable requirements of (A) the health care
     continuation coverage provisions of the Consolidated Omnibus Budget
     Reconciliation Act of 1985, and the regulations thereunder.

          (vii)   Capitol shall disclose in writing to Westamerica the names of
     each director, officer and employee of Capitol and the Bank.

     (o)     Compliance With ERISA.  Capitol has not, since its inception, 
             ---------------------
either maintained or contributed to an employee pension benefit plan, as defined
in Section 3(2) of ERISA, including multiemployer plans, other than the Plan and
a true and accurate copy of which has been provided to Westamerica. With respect
to the Plan and its related trust (the "Trust"), as of the Effective Time, (i)
the Plan will in all material respects be (and currently is) in compliance with
all the applicable requirements of Section 401(a) of the IRC, and the Trust will
be exempt from income tax under Section 501(a) of the IRC; (ii) the Plan
represents the adoption of a standardized prototype plan that received a
favorable opinion letter ("Opinion Letter") from the Internal Revenue Service
("IRS") as to its form dated April 1, 1992; (iii) Capitol relies on such Opinion
Letter as authorized under IRS Revenue Procedure 89-9 as support for the fact
that the Plan is qualified under section 401(a) of the IRC; (iv) no
contributions have exceeded the limitations set forth in Section 415 of the IRC;
(v) all required and necessary filings with the IRS, Department of Labor and any
other governmental agencies with respect to the Plan and the Trust for all
periods ending at or prior to the Effective Time will have been made on a timely
basis by Capitol and the plan administrator; (vi) there shall have been no
material violation of Parts 1 and 4 of Subtitle B of Title I of ERISA or of
Section 4975 of the IRC; and (vii) there shall have been no action, claim or
demand of any kind known to Capitol brought or threatened by any potential
claimant or representative of such claimant under the Plan or Trust where
Capitol may be either (A) liable directly on such action, claim or demand, or
(B) obligated to indemnify any person, group of persons or entity with respect
to such action, claim or demand, unless such action, claim or demand is covered
by adequate reserves reflected in Capitol's June 30, 1994 financial statements
or an insurer of Capitol has agreed to defend against and pay the amount of any
resulting liability without reservation.

     (p)     Collective Bargaining and Employment Agreements. Except as 
             -----------------------------------------------
provided in this Agreement or as disclosed to Westamerica in the Capitol
Disclosure Statement, Capitol does not have any union or collective bargaining
or written employment agreements, contracts or other agreements with any labor
organization or with any member of management, or any management or consultation
agreement not terminable at will by Capitol without liability and no such
contract or agreement has been requested by, or is under discussion by
management with, any group of employees, any member of management or any other
person. There are no material controversies pending between Capitol and any
current or former employees, and to the best of their knowledge, there are no
efforts presently being made by any labor union seeking to organize any of such
employees.

     (q)     Compensation of Officers and Employees.  Except as disclosed to
            --------------------------------------                         
Westamerica in the Capitol Disclosure Statement and except as otherwise provided
in this Agreement, (i) no officer or employee of Capitol is receiving aggregate
direct remuneration at a rate exceeding $40,000 per annum, and (ii) the
consummation of the transactions contemplated by this Agreement will not (either
alone or upon the occurrence of any additional or further acts or events) result
in any payment (whether of severance pay or otherwise) becoming due from
Capitol, or Westamerica to any employee of Capitol.


                                     -20-
<PAGE>
 
     (r)     Legal Actions and Proceedings.  Except as disclosed to Westamerica
             -----------------------------       
in writing prior to the date hereof, Capitol is not a party to, nor threatened
with, any legal action or other proceeding or investigation before any court,
any arbitrator of any kind or any government agency, and to the best of
Capitol's knowledge, Capitol is not subject to any potential adverse claim, the
outcome of which could involve the payment or receipt by Capitol of any amount
in excess of $50,000, unless an insurer of Capitol has agreed to defend against
and pay the amount of any resulting liability without reservation, or, if any
such legal action, proceeding, investigation or claim will not involve the
payment by Capitol of a monetary amount, which could materially adversely affect
Capitol or its business or property or the transactions contemplated hereby.
Capitol has no knowledge of any pending or threatened claims or charges under
the Community Reinvestment Act, before the Equal Employment Opportunity
Commission, the California Department of Fair Housing & Economic Development,
the California Unemployment Appeals Board, or any human relations commission.
There is no labor dispute, strike, slow-down or stoppage pending or, to the best
of the knowledge of Capitol, threatened against Capitol.

     (s)     Execution and Delivery of the Agreement.
             --------------------------------------- 

             (i)     The execution and delivery of this Agreement has been duly
     authorized by the Board of Directors of Capitol and, when this Agreement
     and the Merger have been duly approved by the affirmative vote of the
     holders of a majority of the outstanding shares of Capitol common stock at
     a meeting of shareholders duly called and held, this Agreement and the
     Merger will be duly and validly authorized by all necessary corporate
     action on the part of Capitol.

             (ii)    This Agreement has been duly executed and delivered by
     Capitol and (assuming due execution and delivery by and enforceability
     against Westamerica) constitutes the legal and binding obligations of
     Capitol.

             (iii)   The execution and delivery by Capitol of this Agreement and
     the consummation of the transactions herein (A) do not violate any
     provision of the Articles of Incorporation or Bylaws of Capitol, any
     provision of federal or state law or any governmental rule or regulation
     (assuming (1) receipt of the Government Approvals, (2) receipt of the
     requisite Capitol shareholder approval referred to in Section 4(s)(i)
     hereof, (3) due registration of the Westamerica Shares under the 1933 Act,
     (4) receipt of appropriate permits or approvals under applicable state
     securities laws, and (5) accuracy of the representations of Westamerica set
     forth herein), and (B) do not require any consent of any person under,
     conflict with or result in a breach of, or accelerate the performance
     required by any of the terms of, any material debt instrument, lease,
     license, covenant, agreement or understanding to which Capitol is a party
     or by which it is bound or any order, ruling, decree, judgment, arbitration
     award or stipulation to which Capitol is subject, or constitute a material
     default thereunder or result in the creation of any lien, claim, security
     interest, encumbrance, charge, restriction or similar right of any third
     party upon any of the properties or assets of Capitol.

     (t)     Retention of Broker or Consultant.  No broker, agent, finder,
             ---------------------------------                            
consultant or other party (other than legal, compliance, loan auditors and
accounting advisors) has been retained by Capitol or is entitled to be paid
based upon any agreements, arrangements or understandings made by Capitol in
connection with any of the transactions contemplated by this Agreement, except
that Capitol has engaged the firms of Hoefer & Arnett, Incorporated and Smith &
Crowley to act as its financial advisors and to render opinions regarding the
fairness of the Merger and Financial Institutions Analysts & Consultants, Inc.
("FIAC") to perform limited due diligence services. Capitol shall provide
Westamerica with true and accurate copies of its agreements with Hoefer &
Arnett, Incorporated, Smith & Crowley and FIAC.

     (u)     Insurance.  Capitol is and continuously since its inception has 
             ---------                             
been, insured with reputable insurers against all risks normally insured against
by banks, and all of the insurance policies and bonds

                                     -21-
<PAGE>
 
maintained by Capitol are in full force and effect, Capitol is not in default
thereunder and all material claims thereunder have been filed in due and timely
fashion. In the best judgment of the management of Capitol, such insurance
coverage is adequate for Capitol. Since December 31, 1990, there has not been
any damage to, destruction of, or loss of any assets of Capitol not covered by
insurance that could materially and adversely affect the business, financial
condition, properties, assets or results of operations of Capitol.

     (v)     Loan Loss Reserves.  The reserve for loan losses in the Capitol
             ------------------                                             
consolidated balance sheets dated December 31, 1993, March 31, 1994, June 30,
1994 and September 30, 1994, each subsequent period end prior to the Effective
Date and as of the Effective Date are or will be adequate in all material
respects under the requirements of all applicable state and federal laws and
regulations to provide for possible loan losses on outstanding loans, net of
recoveries, but in no event will be less than sufficient to reserve for
Nonperforming Loans outstanding. For purposes of this Agreement, Nonperforming
Loans means the sum of all accruing loans over 90 days past due in the payment
of principal or interest plus any loans no longer accruing interest.
Nonperforming Loans does not include Other Real Estate Owned or Loan Collateral
Substantively Repossessed. Capitol has disclosed to Westamerica in writing prior
to the date hereof, and will promptly inform Westamerica of the amounts of all
loans, leases, other extensions of credit or commitments, or other interest-
bearing assets of Capitol, that have been classified as of the date hereof or
hereafter by any internal bank examiner or any bank regulatory agency as "Other
Loans Especially Mentioned", "Substandard", "Doubtful", "Loss", or words of
similar import in the case of loans (or that would have been so classified, in
the case of other assets, had they been loans). Notwithstanding the above,
Capitol shall be under no obligation to disclose to Westamerica any such
classification by any bank regulatory agency where such disclosure would violate
any obligation of confidentiality of Capitol imposed by such bank regulatory
agency. Capitol has furnished and will continue to furnish to Westamerica true
and accurate information concerning the loan portfolio of Capitol, and no
material information with respect to the loan portfolio has been or will be
withheld from Westamerica.

     (w)     Transactions With Affiliates.  Except as may arise in the Ordinary
             ----------------------------                                      
Course of Business, Capitol has not extended credit, committed to extend credit,
or transferred any asset to or assumed or guaranteed any liability of the
employees or directors of Capitol, or any spouse or child of any of them, or to
any of their "affiliates" or "associates" as such terms are defined in Rule 405
under Regulation C of the 1933 Act. Capitol has not entered into any other
transactions with the employees or directors of Capitol or any spouse or child
of any of them, or any of their affiliates or associates, except as disclosed in
writing to Westamerica in the Capitol Disclosure Statement. Any such
transactions have been on terms no less favorable than those which would prevail
in an arm's-length transaction with an independent third party.

     (x)     Information in Westamerica Registration Statement.  The information
             -------------------------------------------------                  
pertaining to Capitol which will be furnished to Westamerica for or on behalf of
Capitol for inclusion in the Westamerica Registration Statement, the Prospectus
or the Proxy Statement (each as hereinafter defined), or in the applications to
be filed to obtain the Government Approvals (the "Applications"), will not
contain any untrue statement of any material fact or omits or will omit to state
any material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances under which they are made, not
misleading; provided, however, that information of a later date shall be deemed
to modify information as of an earlier date. All financial statements of Capitol
included in the Prospectus and Proxy Statement will present fairly the financial
condition and results of operations of Capitol at the dates and for the periods
covered by such statements in accordance with GAAP consistently applied
throughout the periods covered by such statements. Capitol shall promptly advise
Westamerica in writing if prior to the Effective Time Capitol shall obtain
knowledge of any facts that would make it necessary to amend the Westamerica
Registration Statement, the Proxy Statement or any Application, or to supplement
the Prospectus, in order to make the statements therein not misleading or to
comply with applicable law.

     (y)     Accuracy of Representations and Warranties.  No representation or
             ------------------------------------------                       
warranty by Capitol, and no statement by Capitol in any certificate, agreement,
schedule or other document furnished in connection with the transactions
contemplated by this Agreement, contains or will contain any untrue statement of
a material fact or omits or will omit to state any material fact necessary to
make such representation, warranty or

                                     -22-
<PAGE>
 
statement not misleading to Westamerica; provided, however, that information as
of a later date shall automatically modify information as of an earlier date.

     (z)     No Brokered Deposits.  Capitol does not now have and shall not 
             --------------------                               
accept prior to or have on the Effective Date any "brokered deposits" as such
deposits are defined by the FDIC.

     5.      REPRESENTATIONS AND WARRANTIES OF WESTAMERICA.
             --------------------------------------------- 

     Westamerica represents and warrants to Capitol that:

     (a)     Corporate Status and Power to Enter Into Agreement. Westamerica 
             --------------------------------------------------
(i) is a corporation duly incorporated, validly existing and in good standing
under California law and is a registered bank holding company under the BHC Act
(ii) subject to the approval of this Agreement and the transactions contemplated
hereby by the FRB, has all necessary corporate power to enter into this
Agreement and to carry out all of the terms and provisions hereof and thereof to
be carried out by it, (iii) Westamerica Bank holds a currently valid license
issued by the Superintendent to engage in the commercial banking business in
California at the offices in which such business is conducted (iv) neither
Westamerica nor any of its subsidiaries is subject to any directive or order
(formal or informal) of the FRB or FRBSF, the Superintendent or any other
regulatory authority having jurisdiction over its or their business or any of
its or their assets or properties.

     (b)     Corporate Status and Power of Westamerica.  Prior to and as of the
             -----------------------------------------                         
Effective Time, Westamerica will be a corporation duly incorporated, validly
existing and in good standing under California law and will have the corporate
power to enter into the Merger Agreement and to carry out all of the terms and
provisions thereof to be carried out by it.

     (c)     Certificate, Bylaws, Books and Records.  The copies of the Articles
             --------------------------------------              
of Incorporation and Bylaws of Westamerica to be delivered to Capitol promptly
after the date hereof are complete and accurate copies thereof as in effect on
the date hereof. The minute books of Westamerica made available to Capitol
contain a complete and accurate record of all meetings of Westamerica's Board of
Directors (and committees thereof) and shareholders. The corporate books and
records (including financial statements) of Westamerica fairly reflect the
material transactions to which Westamerica or any of its subsidiaries is a party
or by which any of their properties are subject or bound, and such books and
records have been properly kept and maintained. The Articles of Incorporation
and Bylaws of Westamerica and all amendments thereto have been duly approved by
all requisite corporate action and said Certificate of Incorporation and all
amendments thereto have been duly filed with the California Secretary of State.

     (d)     Compliance With Laws, Regulations and Decrees. Westamerica and 
             ---------------------------------------------
each of its subsidiaries each (i) has the corporate power to own or lease its
properties and to conduct its business as currently conducted, (ii) has complied
with, and is not in default of any laws, regulations, ordinances, orders or
decrees applicable to the conduct of its business and the ownership of its
properties, including but not limited to all federal and state laws (including
but not limited to the Bank Secrecy Act), rules and regulations relating to the
offer, sale or issuance of securities, and the operation of its subsidiary
commercial banks, other than where such noncompliance or default is not likely
to result in a material limitation on the conduct of the business of Westamerica
or its subsidiaries taken as a whole or is not likely to otherwise have a
material adverse effect on Westamerica and its subsidiaries taken as a whole,
(iii) has not failed to file with the proper federal, state, local or other
authorities any material report or other document required to be so filed, (iv)
has all material approvals, authorizations, consents, licenses, clearances and
orders of, and has currently effective all registrations with, all governmental
and regulatory authorities which are necessary in all material respects to the
respective businesses and operations of Westamerica and its subsidiaries (taken
as a whole) as they are now being conducted, and (v) has received no
notification, formally or informally, from any agency or department of any
federal, state or local government or any regulatory agency or the staff thereof
(A) asserting that Westamerica and its subsidiaries (taken as a whole) are not
in material compliance with any of the statutes, regulations or ordinances which
such government or regulatory authority enforces, or

                                     -23-
<PAGE>
 
(B) threatening to revoke any material licenses, franchise, permit or
governmental authorization of Westamerica and its subsidiaries (taken as a
whole).

     (e)     Financial Statements.  No financial statement or other document
             --------------------                                           
provided or to be provided to Capitol as required by Section 3.1(d) hereof, as
of the date of such document, contained, or as to documents delivered after the
date hereof, will contain, any untrue statement of a material fact, or, at the
date thereof, omitted or will omit to state a material fact necessary in order
to make the statements contained therein, in light of the circumstances under
which such statements were or will be made, not misleading; provided, however,
that information as of a later date shall be deemed to modify information as of
any earlier date. Westamerica has filed all material documents and reports
relating to Westamerica or its subsidiaries required to be filed by it with the
FDIC, the FRB, the SBD or any other governmental authority having jurisdiction
over its business or any of its assets or properties. All such reports conform
in all material respects with the requirements promulgated by such regulatory
agencies. All compliance or corrective action relating to Westamerica or its
subsidiaries required by governmental authorities and regulatory agencies having
jurisdiction over Westamerica or its subsidiaries has been taken. Except as
disclosed in writing to Capitol, Westamerica and its subsidiaries have received
no notification, formally or informally, from any agency or department of any
federal, state or local government or any regulatory agency or the staff thereof
(A) asserting that Westamerica or its subsidiaries are not in compliance with
any of the statutes, regulations or ordinances which such government or
regulatory authority enforces, or (B) threatening to revoke any license,
franchise, permit or governmental authorization of Westamerica or its
subsidiaries. Except as disclosed in writing to Capitol, neither Westamerica nor
any of its subsidiaries is subject to any order, agreement, or written directive
with any regulatory authority with respect to its assets or business except for
matters of general application. Westamerica and its subsidiaries have paid all
assessments made or imposed by any governmental agency. Westamerica shall
deliver to Capitol copies of all annual management letters and opinions, and
shall make available to Capitol for inspection all reviews, correspondence and
other documents in the files of Westamerica prepared by KPMG, or any other
certified public accountant engaged by Westamerica, and delivered to Westamerica
since January 1, 1990. The financial records of Westamerica have been, and are
being and shall be, maintained in all material respects in accordance with all
applicable legal and accounting requirements sufficient to insure that all
transactions reflected therein are, in all material respects, executed in
accordance with management's general or specific authorization and recorded in
conformity with GAAP at the time in effect.

     (f)     Material Adverse Change.  There has been no material adverse 
             -----------------------                                      
change in the financial condition, results of operation or assets of Westamerica
from the financial condition, results of operation or assets indicated in the
financial statements of Westamerica at September 30, 1994, which financial
statements have been heretofore provided to Capitol.

     (g)     Execution and Delivery of the Agreement.
             --------------------------------------- 

             (i)     The execution and delivery of this Agreement has been duly
     and validly authorized by the Board of Directors of Westamerica and this
     Agreement will be duly and validly authorized by all necessary corporate
     action on the part of Westamerica.

             (ii)    This Agreement has been duly executed and delivered by
     Westamerica and (assuming due execution and delivery by and enforceability
     against Capitol) constitutes a legal and binding obligation of Westamerica.

             (iii)   The execution and delivery by Westamerica of this Agreement
     and the consummation of the transactions herein contemplated (A) do not and
     will not violate any provision of the Articles of Incorporation or Bylaws
     of Westamerica, any provision of federal or state law or any governmental
     rule or regulation (assuming (1) receipt of the Government Approvals, (2)
     due registration of the Westamerica Shares under the 1933 Act, (3) receipt
     of appropriate permits or approvals under applicable state securities laws,
     and (4) accuracy of the representations of Capitol set forth herein, and
     (B) do not require any

                                     -24-
<PAGE>
 
     consent of any person under, conflict with or result in a breach of, or
     accelerate the performance required by any of the terms of, any material
     debt instrument, lease, license, covenant, agreement or understanding to
     which Westamerica is a party or by which it is bound or any order, ruling,
     decree, judgment, arbitration award or stipulation to which Westamerica is
     subject, or constitute a material default thereunder or result in the
     creation of any lien, claim, security interest, encumbrance, charge,
     restriction or right of any third party of any kind whatsoever upon any of
     the properties or assets of Westamerica.

     (h)     Information in Westamerica Registration Statement.  The information
             -------------------------------------------------                  
pertaining to Westamerica and each of its subsidiaries which will appear in the
Westamerica Registration Statement, the Prospectus or the Proxy Statement, in
the form filed with the Commission, or in the Applications, will contain no
untrue statement of any material fact or omit to state any material fact
required to be stated therein or necessary to make the statements therein, in
the light of the circumstances under which they are made, not misleading;
provided, however, that the information as of a later date shall be deemed to
modify information as of an earlier date. All financial statements of
Westamerica included in the Prospectus or the Proxy Statement will present
fairly the consolidated financial condition and results of operations of
Westamerica and its consolidated subsidiaries at the dates and for the periods
covered by such statements in accordance with GAAP consistently applied
throughout the periods covered by such statements. Westamerica shall promptly
advise Capitol in writing if prior to the Effective Time Westamerica shall
obtain knowledge of any facts that would make it necessary to amend the
Westamerica Registration Statement, the Proxy Statement or any Application, or
to supplement the Prospectus, in order to make the statements therein not
misleading or to comply with applicable law.

     (i)     Accuracy of Representations and Warranties.  No representation or
             ------------------------------------------                       
warranty by Westamerica and no statement by Westamerica in any certificate,
agreement, schedule or other document furnished in connection with the
transactions contemplated by this Agreement or the Merger Agreement, contains or
will contain any untrue statement of material fact or omits or will omit to
state any material fact necessary to make such representation, warranty or
statement not misleading to Capitol; provided, however, that information as of a
later date shall be deemed to modify information as of an earlier date.

     (j)     Capitalization. As of September 30, 1994, the authorized capital 
             --------------
stock of Westamerica consisted of 1,000,000 shares of Class B Common Stock and
1,000,000 shares of preferred stock, without par value, of which no Class B or
preferred shares were issued or outstanding, and 20,000,000 shares of common
stock, without par value, of which 8,074,851 shares were duly authorized, fully
paid, validly issued, nonassessable and are currently outstanding. Attached to
each outstanding share of Common Stock is a Common Stock Purchase Right which
entitles the holder of each Westamerica Share to certain Rights as set forth in
the Amended Rights Agreement between Westamerica and Chemical Trust Company of
California, dated September 28, 1989 ("Amended Rights Agreement").

     (k)     Tax Returns.  Westamerica has timely filed all federal and state
             -----------                                                     
returns required to be filed by it or its subsidiaries, including, without
limitation, estimated tax, use tax, excise tax, real property and personal
property tax reports and returns, employer's withholding tax returns,
withholding tax returns and Federal Unemployment Tax Act returns, and all other
reports or other information required or requested to be filed by each of them,
and each such return, report or other information was, when filed, complete and
accurate in all material respects. Westamerica and each of its subsidiaries has
paid all taxes, fees and other governmental charges, including any interest and
penalties thereon, when they have become due and payable, except those that are
being contested in good faith, which contested matters shall be disclosed to
Capitol. Except as disclosed in writing to Capitol, neither Westamerica nor any
of its subsidiaries has been requested to give or has given any currently
effective waivers extending the statutory period of limitation applicable to any
tax return required to be filed by any of them for any period. Except as
disclosed in writing to Capitol, there are no material claims pending against
Westamerica or any of its subsidiaries for any alleged deficiency in the payment
of any taxes, and neither Westamerica nor any of its subsidiaries knows of any
pending or threatened audits, investigations or claims for unpaid taxes or
relating to any liability in respect of any taxes. Westamerica shall make
available to Capitol, when available, copies of all of its and its subsidiaries'
tax

                                     -25-
<PAGE>
 
returns with respect to taxes payable to the United States of America and the
State of California for the fiscal years ended December 31, 1992, 1993 and 1994.


     6.      SECURITIES ACT OF 1933; SECURITIES EXCHANGE ACT OF 1934.
             ------------------------------------------------------- 

     (a)     Preparation and Filing of Registration Statement.  Westamerica 
             ------------------------------------------------             
shall promptly prepare and file with the Commission (i) a registration statement
on the appropriate form (the "Westamerica Registration Statement") under and
pursuant to the provisions of the 1933 Act for the purpose of registering the
Westamerica Shares and, (ii) shall prepare and file, as soon as practicable, one
or more registration statements or amendments to existing registration
statements under the 1933 Act for the purpose of registering the maximum number
of shares of common stock of Westamerica to which the option holders of Capitol
may be entitled pursuant to Section 2.6 above at or after the Effective Date.
Westamerica and Capitol shall promptly prepare a proxy statement (the "Proxy
Statement") for the purpose of submitting this Agreement and the Merger to the
shareholders of Capitol for approval. Capitol shall cooperate in all reasonable
respects with regard to the preparation of the Proxy Statement. The Proxy
Statement in definitive form is expected to serve as the prospectus (the
"Prospectus") to be included in the Westamerica Registration Statement.
Westamerica and Capitol shall each provide promptly to the other such
information concerning its business and financial condition and affairs as may
be required or appropriate for inclusion in the Westamerica Registration
Statement, the Prospectus or the Proxy Statement, and shall cause its counsel
and auditors to cooperate with the other's counsel and auditors in the
preparation of the Westamerica Registration Statement, the Prospectus and the
Proxy Statement.

     (b)     Effectiveness of Registration Statement. Westamerica and Capitol 
             ---------------------------------------
shall use their best efforts to have the Westamerica Registration Statement and
any amendments or supplements thereto declared effective under the 1933 Act as
soon as practicable, and thereafter Capitol shall distribute at its cost the
Proxy Statement to holders of its common stock in accordance with applicable
laws and its Articles of Incorporation and Bylaws. Capitol shall not mail or
otherwise furnish the Proxy Statement to its shareholders unless and until
Westamerica shall have received a letter from KPMG dated no more than two
business days prior to the effective date of the Westamerica Registration
Statement, as provided in Section 3.2(f)(iv) hereof.

     (c)     Sales and Resales of Common Stock.  Westamerica shall not be 
             ---------------------------------                        
required to maintain the effectiveness of the Westamerica Registration Statement
for the purpose of sale or resale of the Westamerica Shares by any person.

     (d)     Rule 145.  Securities representing Westamerica Shares issued to
             --------                                                       
affiliates of Capitol (as determined by counsel to Westamerica) under Rule 145
of the Rules and Regulations under the 1933 Act pursuant to the Merger Agreement
may be subject to stop transfer orders and may bear a restrictive legend in
substantially the following form:

     The security represented by this instrument has been issued or transferred
     to the registered holder as the result of a transaction to which Rule 145
     under the 1933 Act applies.  The security represented by this instrument
     may not be sold, hypothecated, transferred or assigned, and the issuer
     shall not be required to give effect to any attempted sale, hypothecation,
     transfer or assignment, except (i) pursuant to a then current effective
     registration under the 1933 Act, or (ii) in a transaction which, in the
     opinion of counsel satisfactory to the issuer is not required to be
     registered under the 1933 Act.

Should any opinion of counsel described in clause (ii) of the foregoing legend
indicate that the legend and any stop transfer order then in effect with respect
to the shares may be removed, Westamerica will upon request substitute
unlegended securities and remove any stop transfer orders. Westamerica shall
timely file annual and quarterly reports pursuant to all applicable securities
laws.

                                     -26-
<PAGE>
 
     7.      CONDITIONS TO THE OBLIGATIONS OF WESTAMERICA.
             -------------------------------------------- 

     The obligations of Westamerica under this Agreement are, at its option,
subject to fulfillment at or prior to the Effective Date of each of the
following conditions; provided, however, that any one or more of such conditions
may be waived by the Board of Directors of Westamerica at any time at or prior
to the Effective Time:

     (a)     Representations and Warranties.  The representations and 
             ------------------------------                           
warranties in Section 4 hereof shall be true and correct in all material
respects on the date hereof and as of the Effective Date, with the same effect
as though such representations and warranties had been made on and as of such
date except as to any representation or warranty which specifically relates to a
specified date and not contain any material inaccuracies or omissions the
circumstances as to which either individually or in the aggregate have, or
reasonably could be expected to have, a material adverse effect on Capitol.

     (b)     Compliance and Performance Under Agreement.  Capitol  shall have
             ------------------------------------------                      
performed and complied in all material respects with all terms of this Agreement
required to be performed or complied with by it at or prior to the Effective
Date. Each of the directors of Capitol also shall have performed and complied in
all material respects with all of the terms and conditions of the undertaking
referred to in Section 3.2(a) above. Capitol acknowledges that its failure to
obtain Westamerica's prior written approval for any material transaction
pursuant to this Agreement and not in the Ordinary Course of Business shall be
within the scope of this paragraph.

     (c)     Material Adverse Change. Except as disclosed to Westamerica in 
             -----------------------
writing prior to the date hereof, no materially adverse change shall have
occurred since December 31, 1993, in the business, financial condition or
results of operations of Capitol and Capitol shall not be a party to or, so far
as Capitol is aware, threatened with, and to Capitol's knowledge there is no
reasonable basis for, any legal action or other proceeding before any court, any
arbitrator of any kind or any government agency if, in the reasonable judgment
of Westamerica, such legal action or proceeding could materially adversely
affect Capitol, or its business, financial condition, results of operations or
prospects taken as a whole.

     (d)     Approval of Agreement.  This Agreement and the Merger shall have 
             ---------------------                                          
been duly approved by the affirmative vote of the holders of a majority of the
outstanding shares of Capitol common stock at the meeting of shareholders duly
called and held after distributing the Proxy Statement to all shareholders
entitled to vote at such meeting as required by Section 6 hereof.

     (e)     Officer's Certificate.  Westamerica shall have received a 
             ---------------------                                     
certificate, dated the Effective Date, signed on behalf of Capitol by its Chief
Executive Officer and by its Chief Financial Officer, to the effect that the
conditions in Sections 7(a)-(d) have been satisfied.

     (f)     Opinion of Counsel.  Capitol shall have delivered to Westamerica 
             ------------------                                          
such documents as may reasonably be requested by Westamerica to evidence
compliance by Capitol with the provisions of this Agreement including an opinion
or opinions of counsel which opinion or opinions shall in the aggregate cover
all of the opinions contained in and be substantially in the form attached
hereto as Exhibit D.

     (g)     Absence of Legal Impediment.  No significant legal impediment to 
             ---------------------------                              
the Merger shall have arisen and no litigation, proceeding or investigation
shall be pending or threatened before any court or government agency relating to
the transactions contemplated by this Agreement which affords a material basis
for a determination that it would be inadvisable or inexpedient to continue to
carry out the terms of, or to attempt to consummate the transactions
contemplated by this Agreement.

     (h)     Effectiveness of Registration Statement.  The Westamerica 
             ---------------------------------------               
Registration Statement and any amendments or supplements thereto shall have
become effective under the 1933 Act, no stop order suspending the effectiveness
of such Registration Statement shall be in effect and no proceedings for such
purpose shall have been initiated or threatened by or before the Commission. All
state securities permits or approvals

                                     -27-
<PAGE>
 
required by applicable state securities laws to consummate the transactions
contemplated by this Agreement shall have been received and remain in effect.

     (i)     Government Approvals. All Government Approvals shall be in effect, 
             --------------------
and all conditions or requirements prescribed by law or by any such Government
Approval shall have been satisfied; provided, however, that no Government
Approval shall be deemed to have been received if it shall require the
divestiture or cessation of any of the present businesses or operations
conducted by either of the parties hereto or shall impose any other condition or
requirement, which divestiture, cessation, condition or requirement Westamerica
in its reasonable judgment shall deem to be materially burdensome (in which case
Westamerica shall promptly notify Capitol); and provided further, however, that
the failure to obtain all Government Approvals for whatever reason shall entitle
Capitol to the termination payment specified in Section 12(e). For purposes of
this Agreement no condition shall be deemed to be "materially burdensome" if
such condition does not materially differ from conditions regularly imposed by
the FRB in orders approving transactions of the type contemplated by this
Agreement and compliance with such condition would not (A) require the taking of
any action materially inconsistent with the manner in which Westamerica or
Capitol has conducted its business previously, (B) have a material adverse
effect upon the business, financial condition or results of operations of
Westamerica or Capitol, or (C) preclude satisfaction of any of the material
conditions to consummation of the transactions contemplated by this Agreement.

     (j)     Tax Opinion or Ruling.  Westamerica and Capitol shall have received
             ---------------------                                              
either a ruling from the IRS under federal income tax law and an equivalent
ruling from the California Franchise Tax board, or, to the extent such rulings
have not been sought or received on or before the Effective Date, an opinion of
Westamerica's counsel, subject to assumptions and exceptions normally included,
in form and substance reasonably satisfactory to Westamerica and its counsel,
substantially to the effect that under federal income tax law and California
income and franchise tax law:

             (i)     The Merger will not result in any recognized gain or loss
     to Westamerica or Capitol;

             (ii)    Except for any cash received in lieu of any fractional
     share, no gain or loss will be recognized by holders of Capitol Shares who
     receive Westamerica Shares in exchange for the Capitol Shares which they
     hold;

             (iii)   The holding period of Westamerica Shares exchanged for
     Capitol Shares will include the holding period of the Capitol Shares for
     which it is exchanged, assuming the shares of Capitol Shares are capital
     assets in the hands of the holder thereof at the Effective Date; and

             (iv)    The basis of the Westamerica Shares received in the
     exchange will be the same as the basis of the Capitol Shares for which it
     was exchanged, less any basis attributable to fractional shares for which
     cash is received.

     (k)     Accountant's Letter. Westamerica shall have received letters 
             -------------------
addressed to Westamerica from KPMG prepared pursuant to the provisions of
Section 3.2(f)(iv).

     (l)     Dissenting Shares.  The aggregate number of shares of Capitol 
             -----------------                                          
common stock held by persons who have taken all of the steps required at or
prior to the shareholders' meeting referenced in Section 3.2(a) to perfect their
right (if any) to be paid the value of such shares under the GCL ("Dissenting
Shares") shall not exceed 9% of the outstanding shares of Capitol common stock.

     (m)     Unaudited Financials.  Not later than three business days prior 
             --------------------                                           
to the Effective Date, Capitol shall have furnished Westamerica a copy of its
most recently prepared unaudited year-to-date consolidated financial statements,
including a balance sheet and year-to-date statement of income and statement of
cash flows of Capitol, each prepared in accordance with GAAP. At least five
business days prior to the Effective

                                     -28-
<PAGE>
 
Time, all attorneys, accountants, investment bankers and other advisors and
agents for Capitol shall have submitted to Capitol (with a copy to Westamerica)
estimates of their fees and expenses for all services rendered in any respect in
connection with the transactions contemplated hereby to the extent not already
paid, and based on such estimates, Capitol shall have prepared and submitted to
Westamerica a summary of such fees and expenses for the transaction which shall
be reflected in the foregoing financial statement. At the Effective Time, (i)
such advisors shall have submitted their final bills for such fees and expenses
to Capitol for services rendered, with a copy to be delivered to Westamerica,
and based on such summary, Capitol shall have prepared and submitted to
Westamerica a final calculation of such fees and expenses, (ii) Capitol shall
have accrued and paid the amount of such fees and expenses as calculated above
after Westamerica has been given an opportunity to review all such bills and
calculation of such fees and expenses, and (iii) such advisors shall have
released Westamerica from liability for any fees and expenses.

     (n)     Letter Regarding Insurance Coverage.  Thirty (30) days prior to
             -----------------------------------                            
Closing, a law firm reasonably acceptable to Westamerica shall have delivered a
letter dated as of a date no more than 30 days before the Closing addressed to
Westamerica, which letter shall be in substantially the form attached hereto as
Exhibit G. Such law firm shall also deliver to Westamerica two business days
prior to the Closing a letter dated as of a date no more than two business days
before the Closing, which is in substantially the form attached hereto as
Exhibit G, or otherwise confirms that the views expressed in its earlier letter
are unchanged.

     (o)     Closing Documents.  Westamerica shall have received such 
             -----------------                                        
certificates and other closing documents as counsel for Westamerica shall
reasonably request.

     (p)     Consents.  Capitol shall have received, or Westamerica shall have
             --------                                                         
satisfied itself that Capitol will receive, all consents of other parties to and
required by material mortgages, notes, leases, franchises, agreements, licenses
and permits applicable to Capitol, in each case in form and substance reasonably
satisfactory to Westamerica, and no such consent or license or permit shall have
been withdrawn or suspended.

     (q)     Fairness Opinions.  The Board of Directors of Capitol shall have
             -----------------                                               
received an opinion of each of Hoefer & Arnett, Incorporated and Smith &
Crowley, each dated within three business days of the effective date of the
Westamerica Registration Statement to the effect that the terms of the Merger
are fair, from a financial point of view, to Capitol and its shareholders.

     (r)     Losses in Investment and Loan Portfolios.  At and as of the 
             ----------------------------------------              
Effective Date, losses actually realized by Capitol from the sale of securities
held in Capitol's investment portfolios after September 30, 1994 and prior to
the Effective Date shall be reflected in the financial statements of Capitol as
of the last day of the calendar month preceding the calendar month in which the
Effective Date occurs. Additionally, the aggregate amount of loans on the books
of Capitol which are classified by any bank examiner, Capitol or Westamerica or
any loan review consultant engaged by Capitol or Westamerica for the purpose of
examining loans (using standard banking practice) as "Loss" shall have been
charged off. Capitol shall also have an allowance for loan losses that is
satisfactory to reserve for all nonperforming loans, as reflected in the
financial statements of Capitol as of the last day of the calendar month and the
last day of the calendar quarter preceding the calendar month in which the
Effective Date occurs and, within 30 days of the Effective Date, Capitol shall
have recognized any credit losses that Westamerica reasonably determines are
appropriate in the Bank's loan and asset portfolios, and utilized Westamerica's
standards, methodology and system in determining the adequacy of Capitol's loan
loss reserves as of and for the month end preceding the Effective Date.

     (s)     Satisfaction of Spending or Other Commitments.  There shall have 
             ---------------------------------------------                  
been no failure by Capitol to perform the obligations or satisfy the conditions
set forth in Sections 2.6, 3.2(d) and 3.2(h)(ii) of this Agreement and the
undertakings required from each Capitol director pursuant to section 3.2(a)
shall have been delivered within 15 business days after the execution and
delivery of this Agreement.

                                     -29-
<PAGE>
 
     (t)     Pooling-of-Interests Accounting Treatment; Dissenters' Rights.
             -------------------------------------------------------------  
Westamerica shall have received a letter from KPMG to the effect that the Merger
shall qualify for the pooling-of-interests method of accounting in accordance
with GAAP and all applicable rules, regulations and policies of the Commission.
In addition, there shall have been no determination by any court, tribunal,
regulatory agency or other governmental entity, that the Merger fails or will
fail to qualify for pooling-of-interests accounting treatment and no more than
nine (9%) percent of Capitol's Shares shall have the right to dissent under the
GCL.

     (u)     Compliance Examinations.  Prior to the Effective Date, Capitol 
             -----------------------                                      
shall have taken all corrective action recommended by or resulting from its most
recent compliance examinations and any significant regulatory compliance
violations shall have been corrected by Capitol prior to the Effective Date.

     (v)     Opinion of Loan Review Examiner.  Capitol shall have delivered to
             -------------------------------                                  
Westamerica an opinion of its loan review examiner, which opinion shall be
acceptable to Westamerica, to the effect that all loan losses in excess of
$25,000 have been identified with respect to loans and related assets on the
books of Capitol and its subsidiaries as of a date no earlier than four months
preceding the Effective Date.

     (w)     Regulatory Examination.  Prior to the Effective Date, Capitol 
             ----------------------                                       
shall be in compliance with all requirements arising from its most recent safety
and soundness regulatory examination.

     (x)     Stock Option Agreement.  Immediately following the execution and
             ----------------------                                          
delivery of this Agreement, Capitol and Westamerica shall have executed and
delivered the Stock Option Agreement.

     (y)     Classified Loans.  The percentage determined by dividing Classified
             ----------------                                                   
Loans by the sum of equity capital (excluding adjustments required by FASB 115)
plus reserves for loan losses as of December 31, 1994, the month end immediately
preceding the Effective Date and two business days prior to the Effective Date
shall be no greater than 42%. For purposes of this section, Classified Loans is
the sum of all loans classified according to current regulatory standards as
"Substandard", "Doubtful", or "Loss", but excludes real estate owned.

     (z)     Noncompetition Agreements and Certificate.  Within 15 business 
             -----------------------------------------                    
days of the execution of this Agreement, Westamerica shall have received
executed noncompetition agreements substantially in the form attached hereto as
Exhibit B or B-1 from each nonofficer director of Capitol listed on Exhibit F
hereto.

     (aa)    Resignation of Directors and Certain Executive Officers.  At least
             -------------------------------------------------------           
three days prior to Closing, Westamerica shall have received a letter from (i)
each director of Capitol tendering his or her resignation from the Board of
Directors effective at the Effective Time and (ii) from each of Thayer T.
Prentice and William J. Martin tendering his resignation as Vice Chairman and
Chief Executive Officer and President, respectively, of Capitol effective at the
time Capitol is merged into Westamerica Bank.

     8.      CONDITIONS TO THE OBLIGATIONS OF CAPITOL.
             ---------------------------------------- 

     The obligations of Capitol under this Agreement are, at its option, subject
to the fulfillment at or prior to the Effective Time of each of the following
conditions provided, however, that any one or more of such conditions may be
waived by the Board of Directors of Capitol at any time at or prior to the
Effective Time:

     (a)     Representations and Warranties.  The representations and 
             ------------------------------                         
warranties of Westamerica in Section 5 hereof shall be true and correct in all
material respects on the date hereof and as of the Effective Date, with the same
effect as though such representations and warranties had been made on and as of
such date except as to any representation or warranty which specifically relates
to a specified date and does not contain any inaccuracies or omissions the
circumstances as to which either individually or in the aggregate have, or
reasonably could be expected to have, a material adverse effect on Westamerica.

                                     -30-
<PAGE>
 
     (b)     Compliance and Performance Under Agreement.  Westamerica and its
             ------------------------------------------                      
subsidiaries shall have performed and complied in all material respects with all
of the terms of this Agreement required to be performed or complied with by them
at or prior to the Effective Time.

     (c)     Material Adverse Change.  No materially adverse change shall have
             -----------------------                                          
occurred since December 31, 1993, in the business, financial condition, results
of operations or properties of Westamerica and its subsidiaries taken as a
whole, and Westamerica shall not be engaged in, or a party to or so far as
Westamerica is aware, threatened with, and to Westamerica's knowledge there is
no reasonable basis for, any legal action or other proceeding before any court,
any arbitrator of any kind or any government agency which, in the reasonable
judgment of Capitol, could materially adversely affect Westamerica or its
business, financial condition, results of operations or assets.

     (d)     Officer's Certificate.  Capitol shall have received a certificate,
             ---------------------                                             
dated the Effective Date, signed on behalf of Westamerica by its President and
Chief Executive Officer and Chief Financial Officer, certifying to the
fulfillment of the conditions stated in Sections 8(a)-(c) hereof.

     (e)     Approval of Agreement.  This Agreement and the Merger shall have 
             ---------------------                                            
been duly approved by the affirmative vote of a majority of the outstanding
shares of Capitol common stock at a meeting of shareholders duly called and
held.

     (f)     Opinion of Counsel.  Westamerica shall have delivered to Capitol 
             ------------------                                               
such documents as may reasonably be requested by Capitol to evidence compliance
by Westamerica with the provisions of this Agreement including an opinion of its
counsel in substantially the form attached hereto as Exhibit H.

     (g)     Effectiveness of Registration Statement.  The Westamerica 
             ---------------------------------------                   
Registration Statement and any amendments or supplements thereto shall have
become effective under the 1933 Act. No stop order suspending the effectiveness
of the Westamerica Registration Statement shall be in effect and no proceedings
for such purpose shall have been initiated or threatened by or before the
Commission. All state securities and "blue sky" permits or approvals required by
applicable state securities laws to consummate the transactions contemplated by
this Agreement and the Merger Agreement shall have been received and remain in
effect.

     (h)     Government Approvals.  The Government Approvals shall have been
             --------------------                                           
received and shall be in effect, and all conditions or requirements prescribed
by law or by any such approval shall have been satisfied.

     (i)     Tax Opinion or Ruling. Westamerica and Capitol shall have received
             ---------------------
the opinions or tax rulings referred to in Section 7(j) hereof which opinions or
rulings shall meet the requirements of such Section.

     (j)     Closing Documents.  Capitol shall have received such certificates 
             -----------------                                             
and other closing documents as counsel for Capitol shall reasonably request.

     (k)     Absence of Legal Impediment.  No significant legal impediment to 
             ---------------------------                                      
the Merger shall have arisen and no litigation, proceeding or investigation
shall be pending or threatened before any court or government agency relating to
the transactions contemplated by this Agreement which affords a material basis
for a determination that it would be inadvisable or inexpedient to continue to
carry out the terms of, or to attempt to consummate the transactions
contemplated by this Agreement.

     (l)     Fairness Opinions.  The Board of Directors of Capitol shall have
             -----------------                                               
received an opinion of each of Hoefer & Arnett, Incorporated and Smith &
Crowley, each dated within three business days of the effective date of the
Westamerica Registration Statement to the effect that the terms of the Merger
are financially fair, from a financial point of view, to Capitol and its
shareholders.

     (m)     Pooling-of-Interests Accounting Treatment.  Westamerica shall have
             -----------------------------------------                         
received a letter from KPMG to the effect that the Merger shall qualify for the
pooling-of-interests method of accounting in accordance with GAAP and all
applicable rules, regulations and policies of the Commission. In addition,

                                     -31-
<PAGE>
 
there shall have been no determination by any court, tribunal, regulatory agency
or other governmental entity, that the Merger fails or will fail to qualify for
pooling-of-interests accounting treatment.


     9.      CLOSING.
             ------- 

     (a)     Closing Date.  The closing (the "Closing") shall, unless another 
             ------------                                                    
date, time or place is agreed to in writing by Westamerica and Capitol, be held
at the offices of Pillsbury Madison & Sutro, 235 Montgomery Street, San
Francisco, California on the Effective Date.

     (b)     Delivery of Documents.  At the Closing, the opinions, certificates
             ---------------------                                   
and other documents required to be delivered by this Agreement shall be
delivered.

     (c)     Filings.  At the Closing, Westamerica and Capitol shall instruct 
             -------                                                        
their respective representatives to make or confirm such filings as shall be
required in the opinion of counsel to Westamerica and Capitol to give effect to
the Merger.


     10.     POST-CLOSING MATTERS.
             -------------------- 

     Westamerica will cause Westamerica Bank and Capitol to merge (with
Westamerica Bank being the surviving corporation) as soon as practicable
following the Effective Date. Westamerica will prepare and file with the
Commission on the appropriate form as soon as practicable the results of
combined operations of Westamerica and Capitol for the first full calendar month
after the Effective Date as contemplated in Exhibit E.


     11.     EXPENSES.
             -------- 

     Westamerica and Capitol hereto agree to pay, without right of reimbursement
from the other party and whether or not the transactions contemplated by this
Agreement or the Merger Agreement shall be consummated, the costs incurred by
each such party incident to the performance of its obligations under this
Agreement and the Merger Agreement, including without limitation, costs incident
to the preparation of this Agreement, the Westamerica Registration Statement,
Prospectus and the Proxy Statement (including the audited financial statements
of the parties contained therein) and incident to the consummation of the Merger
and of the other transactions contemplated herein and in the Merger Agreement,
including the fees and disbursements of counsel, accountants, consultants and
financial advisers employed by such party in connection therewith.
Notwithstanding the foregoing, Westamerica shall be solely responsible for all
fees payable pursuant to state securities laws, fees related to obtaining a
revenue ruling or tax opinion and the fee required to be paid to the Commission
to register the Westamerica Shares.

     Capitol shall bear its own costs of printing and distributing (including
postage) the Proxy Statement to its shareholders and other information relating
to these transactions.


     12.     AMENDMENT; TERMINATION.
             ---------------------- 

     (a)     Amendment.  This Agreement and the Merger Agreement may be amended
             ---------                                                  
by Westamerica and Capitol at any time prior to the Effective Time without the
approval of the shareholders of Westamerica and shareholders of Capitol with
respect to any of their terms except the terms relating to the form or amount of
consideration to be delivered to the Capitol shareholders in the Merger.

     (b)     Termination. This Agreement and the Merger Agreement may be 
             -----------
terminated as follows:

                                     -32-
<PAGE>
 
          (i)     By the mutual consent of the Boards of Directors of both
     Westamerica and Capitol at any time prior to the consummation of the
     Merger.

          (ii)    By the Board of Directors of Westamerica on or after July 31,
     1995, if (A) any of the conditions in Section 7 to which the obligations of
     Westamerica are subject have not been fulfilled, or (B) such conditions
     have been fulfilled or waived by Westamerica and Capitol shall have failed
     to complete the Merger.

          (iii)   By the Board of Directors of Westamerica if (A) after the date
     of Capitol's Disclosure Statement Westamerica has become aware of any facts
     or circumstances of which it was not previously aware and which materially
     adversely affect Capitol or its respective properties, operations,
     financial condition or prospects, (B) a materially adverse change shall
     have occurred since December 31, 1993, in the business, financial
     condition, results of operations or properties of Capitol, (C) there has
     been failure (including any anticipatory breach) on the part of Capitol to
     comply with its obligations under this Agreement, or any failure (including
     any anticipatory breach) to comply with any of the conditions set forth in
     Section 7 hereof, or (D) the provisions of Section 3.2(j)(iv) become
     operable.

          (iv)    By Westamerica if, after the date hereof, any person (other
     than Westamerica or any subsidiary thereof) shall become the beneficial
     owner of 20% or more of the then outstanding shares of Capitol Shares or
     any person (other than Westamerica or a subsidiary thereof) shall have
     commenced a bona fide tender offer or exchange offer to acquire at least
     20% of the then outstanding shares of Capitol.

          (v)     By the Board of Directors of Westamerica if it determines that
     it would be inadvisable or inexpedient to continue to carry out the terms
     of, or to attempt to consummate the transactions contemplated by this
     Agreement, by reason of any significant legal impediment to the Merger
     having arisen, or any material pending or threatened litigation,
     investigation or proceeding, including, but not limited to any of the
     preceding that relate to the transactions contemplated by this Agreement
     which affords a material basis for such determination.

          (vi)    By the Board of Directors of Capitol on or after July 31,
     1995, if (A) any of the conditions contained in Section 8 to which the
     obligations of Capitol are subject have not been fulfilled, or (B) such
     conditions have been fulfilled or waived but Westamerica shall have failed
     to complete the Merger; provided, however, that if Westamerica is engaged
     at the time in litigation (including an administrative appeal procedure)
     relating to an attempt to obtain one or more of the Governmental Approvals
     or if Westamerica shall be contesting in good faith any litigation which
     seeks to prevent consummation of the transactions contemplated hereby, such
     nonfulfillment shall not give Capitol the right to terminate this Agreement
     until the earlier of (A) twelve (12) months after the date of this
     Agreement and (B) sixty (60) days after the completion of such litigation
     and of any further regulatory or judicial action pursuant thereto,
     including any further action by a governmental agency as a result of any
     judicial remand, order or directive or otherwise or any waiting period with
     respect thereto.

          (vii)   By the Board of Directors of Capitol if (A) it has become
     aware of any facts or circumstances of which it was not aware on the date
     hereof and which can or do materially adversely affect Westamerica and its
     subsidiaries (taken as a whole) or their properties, operations, financial
     condition or prospects (taken as a whole), (B) a materially adverse change
     shall have occurred since December 31, 1993 in the business, financial
     condition, results of operations or assets (of Westamerica and its
     subsidiaries taken as a whole), (C) there has been failure (including any
     anticipatory breach) on the part of Westamerica to comply with its
     obligations under this Agreement or any failure (including

                                     -33-
<PAGE>
 
     any anticipatory breach) to comply with any condition set forth in Section
     8, (D) the Average Price of Westamerica Common Stock pursuant to Section
     2.1(c) is less than $30.20, or (E) Westamerica fails to comply with the
     provisions of Section 3.1(f).

     (c)     Notice.  The power of termination hereunder may be exercised by
             ------                                                         
Westamerica or Capitol, as the case may be, only by giving written notice,
signed on behalf of such party by its Chairman of the Board or President, to the
other party.

     (d)     Breach of Obligations.  If there has been a material breach by 
             ---------------------                                       
either party in the performance of any of the obligations herein which shall not
have been cured within ten business days after written notice thereof has been
given to the defaulting party, the nondefaulting party shall have the right to
terminate this Agreement upon written notice to the other party. In any event,
the nondefaulting party shall have no obligation to consummate any transaction
or take any further steps toward such consummation contemplated hereunder until
such breach is cured.

     (e)     Termination and Expenses.  Termination of this Agreement shall not
             ------------------------                                          
terminate or affect the obligations of the parties to pay expenses as provided
in Section 11, to maintain the confidentiality of the other party's information
pursuant to Section 3.3, or the provisions of this Section 12(e) or of Sections
13(a), (d) or (e) or the second sentence of Section 13(b) below and shall not
affect any agreement after such termination. If this Agreement shall be
terminated by Westamerica pursuant to Section 12(b)(iii)(D) or Section
12(b)(iv), or if any of the events specified in Section 12(b)(iv) occurs within
twelve (12) months following termination of this Agreement pursuant to Section
12(b) as a result of the interference of a third party or group who thereafter
attempts to acquire Capitol, Capitol shall pay to Westamerica, on demand, the
sum of $600,000. If this Agreement shall be terminated by Capitol pursuant to
Section 12(b)(vii)(E) by reason of a Business Combination, Westamerica shall pay
to Capitol, on demand, the sum of $600,000. If this Agreement shall be
terminated by Westamerica pursuant to Section 12(b)(ii) or Capitol pursuant to
Section 12(b)(vi) because of a failure to satisfy the conditions set forth in
Sections 7(i) or 8(h), upon demand and subject to Capitol's compliance with
Section 3.2(c), Westamerica shall pay Capitol $1,200,000. Any payment required
pursuant to the preceding three sentences shall be paid no more than two
business days after demand by the party entitled to make such demand by wire
transfer of immediately available federal funds. Except as provided in Section
3.1(b), Section 3.1(f) or Section 3.2(j)(iv), Capitol and Westamerica agree that
any termination of this Agreement shall not in any manner release or be
construed as so releasing the nonterminating party or parties from any liability
or damage to the other party or parties arising out of, in connection with or
otherwise relating to, directly or indirectly, such parties' failure in
performance of any of its covenants or agreements hereunder.

     (f)     Special Westamerica Rights of Termination.  Capitol shall deliver 
             -----------------------------------------                      
to Westamerica all remaining portions of the Capitol Disclosure Statement not
heretofore delivered to Westamerica as promptly as practicable after the date
hereof and in no event more than 10 days after the date hereof. Notwithstanding
any investigation made by or information known to Westamerica prior to the date
hereof and notwithstanding anything to the contrary herein, and in recognition
of the fact that Westamerica, as of the date hereof, has not had an opportunity
to complete its due diligence review of Capitol and that Capitol may not have,
as of the date hereof, delivered to Westamerica all portions of the Capitol
Disclosure Statement, in addition to the termination rights set forth above and
notwithstanding the provisions of Section 12(b)(iii), Westamerica shall have the
following rights (the "Special Termination Rights"): at any time after the date
of this Agreement through and including the date that is 30 days after the date
Capitol delivers to Westamerica all remaining portions of the Capitol Disclosure
Statement in form and detail of presentation reasonably satisfactory to
Westamerica, to terminate this Agreement if Westamerica shall identify any
circumstance which, in the reasonable business judgment of the Board of
Directors (which includes a committee thereof) of Westamerica, acting in good
faith and with due regard for principles of fair dealing, could (w) materially
and adversely impact the reasonably expected financial or business benefits to
Westamerica of the transactions contemplated by this Agreement, (x) be
inconsistent in any material and adverse respect with any of the representations
and warranties of Capitol contained in this Agreement, (y) materially and
adversely affect the business, operations, properties, financial condition,
results of operations or prospects of Capitol or (z) deviate materially and

                                     -34-
<PAGE>
 
adversely from Capitol's financial statements for the year or the quarter ended
December 31, 1993. Westamerica may exercise the Special Termination Rights by
written notice to Capitol.


     13.     MISCELLANEOUS.
             ------------- 

     (a)     Notices. Any notice or other communication required or permitted 
             -------
under this Agreement shall be effective only if it is in writing and delivered
personally, or by overnight express or by facsimile or sent by first class
United States mail, postage prepaid, registered or certified mail, addressed as
follows:

     To WESTAMERICA:                              To CAPITOL:

     David L. Payne, President &                  J. Al Wickland
      Chief Executive Officer                       Chairman of the Board
     Westamerica Bancorporation                   CapitolBank Sacramento
     1108 Fifth Avenue                            300 Capitol Mall
     San Rafael, CA 94901                         Sacramento, CA 95814

     With a copy to:                              With a copy to:

     Jonathan D. Joseph, Esq.                     James E. Topinka, Esq.
     Pillsbury Madison & Sutro                    Pettit & Martin
     P.O. Box 7880                                101 California Street
     San Francisco, CA 94120                      San Francisco, CA 94111

or to such other address as either party may designate by notice to the other,
and shall be deemed to have been given upon receipt.

     (b)     Binding Agreement.  This Agreement is binding upon and is for the
             -----------------                                                
benefit of Westamerica and Capitol and their respective successors and permitted
assigns. This Agreement is not made for the benefit of any person, firm,
corporation or association not a party hereto (except as provided in Section
3.1(g)), and no other person, firm, corporation or association shall acquire or
have any right under or by virtue of this Agreement. No party may assign this
Agreement or any of its rights, privileges, duties or obligations hereunder
without the prior written consent of the other party to this Agreement.

     (c)     No Survival of Representations and Warranties.  No investigation by
             ---------------------------------------------                      
Westamerica or Capitol made before or after the date of this Agreement shall
affect the representations and warranties which are contained in this Agreement
and such representations and warranties shall survive such investigation,
provided that, except with respect to covenants and agreements to be performed
in whole or in part subsequent to the Effective Date (as to which the related
representations and warranties shall survive until their performance) which
covenants and agreements shall survive the Closing, the representations,
warranties, covenants and agreements of Westamerica and Capitol contained in
this Agreement shall not survive the Closing.

     (d)     Governing Law.  This Agreement shall be governed by and construed 
             -------------                                                  
in accordance with the substantive laws of the State of California.

     (e)     Attorneys' Fees. In any action at law or suit in equity in 
             ---------------
relation to this Agreement, the prevailing party in such action or suit shall be
entitled to receive a reasonable sum for its attorneys' fees and all other
reasonable costs and expenses incurred in such action or suit.

     (f)     Entire Agreement; Severability.  This Agreement and the documents,
             ------------------------------                                    
certificates, agreements, letters, schedules and exhibits attached or required
to be delivered pursuant hereto set forth the entire agreement and understanding
of the parties in respect of the transactions contemplated hereby, and supersede
all prior agreements, arrangements and understandings relating to the subject
matter hereof. Each

                                     -35-
<PAGE>
 
provision of this Agreement shall be interpreted in a manner to be effective and
valid under applicable law, but if any provision hereof shall be prohibited or
ruled invalid under applicable law, the validity, legality and enforceability of
the remaining provisions shall not, except as otherwise required by law, be
affected or impaired as a result of such prohibition or ruling. KPMG shall be
the sole arbiter of any disagreement about the application of GAAP pursuant to
this Agreement.

     (g)     Counterparts.  This Agreement may be executed in several 
             ------------                                            
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

     (h)     Waivers.  Prior to or at the Effective Time, each of Westamerica 
             -------                                                        
and Capitol shall have the right to waive any default in the performance of any
term of this Agreement by the other, to waive or extend the time for the
compliance or fulfillment by the other of any and all of the other's obligations
under this Agreement and to waive any or all of the conditions precedent to its
obligations under this Agreement, except any condition which, if not satisfied,
would result in the violation of any law or applicable governmental regulation.
No failure to exercise and no delay in exercising any right, remedy or power
hereunder shall operate as a waiver thereof, nor shall any single or partial
exercise of any right, remedy or power hereunder preclude any other or further
exercise thereof or the exercise of any other right, remedy or power provided
herein or by law or in equity. The waiver by any party of the time for
performance of any act or condition hereunder does not constitute a waiver of
the act or condition itself. Any requests for waivers or waivers granted
pursuant to this Section 13(i) shall be in accordance with the provisions of
Section 13(a) hereof.

     IN WITNESS WHEREOF, Westamerica and Capitol have each caused this Agreement
and Plan of Reorganization to be signed by its Chairman of the Board and its
corporate seal to be hereunto affixed and attested by the signature of its
Secretary all as of the day and year first above written.

ATTEST:                                  WESTAMERICA BANCORPORATION
 


/s/M. Kitty Jones                        /s/David L. Payne
- ------------------------------           -----------------------------------
Secretary


ATTEST:                                  CAPITOLBANK SACRAMENTO



/s/Lawrence D. McGovern                  /s/Thayer T. Prentice
- ------------------------------           -----------------------------------
Secretary                                Vice-Chairman and Chief Executive 
                                         Officer


                                     -36-
<PAGE>
 
                                                                     Exhibit A-1

                          Form of Agreement of Merger


          THIS AGREEMENT OF MERGER, dated as of             , 1995 (this "Merger
                                                ------------
Agreement"), is made and entered into by and between CAPITOLBANK SACRAMENTO, a
                                                     ----------------------   
California banking corporation ("Capitol"), WESTAMERICA BANCORPORATION, a
                                            --------------------------   
California corporation ("Westamerica"), and WESTAMERICA MERGER SUBSIDIARY, a
                                            -----------------------------   
California corporation ("Merger Sub").

                              W I T N E S S E T H:

          A. The Boards of Directors of Westamerica and Capitol have approved,
and deem it advisable and in the best interests of Westamerica, Capitol and
their respective shareholders, that Westamerica and Capitol consummate the
business transaction provided for herein in which Merger Sub, a wholly-owned
subsidiary of Westamerica, would merge with and into Capitol (the "Merger").

          B.     Westamerica and Capitol have entered into an Agreement and Plan
of Reorganization, dated as of November 17, 1994 (the "Agreement"), providing,
among other things, for the execution and filing of this Merger Agreement and
the consummation of the Merger.

          NOW, THEREFORE, in consideration of the promises and mutual agreements
contained in this Merger Agreement and in the Agreement, the parties to this
Merger Agreement hereby agree that Merger Sub shall be merged with and into
Capitol in accordance with the provisions of the laws of the State of California
upon the terms and subject to the conditions set forth as follows:


          1.     The Merger.
                 ---------- 

          1.1 The Merger shall be pursuant to the provisions of, and with the
effect provided in, the Federal Deposit Insurance Act, the Federal Reserve Act
and the California Financial Code, and the Merger shall become effective on the
date (the "Effective Date") a copy of this Agreement certified by the Secretary
of the State of California is filed with the Superintendent of Banks of the
State of California (the "Superintendent").

          1.2 On the Effective Date, Merger Sub shall be merged with and into
Capitol and Capitol shall be the surviving corporation (the "Surviving
Corporation") in the Merger in accordance with the terms and provisions of this
Agreement.  Capitol shall thereupon succeed, without other transfer, to all
rights and properties of, and shall be subject to all the debts and liabilities
of, Merger Sub and the separate existence of Capitol as a California
corporation, with all its purposes, objects, rights, powers, privileges,
liabilities, obligations and franchises shall continue unaffected and unimpaired
by the Merger.

          2.     Corporate Governance Matters.
                 ---------------------------- 

          2.1 From and after the Effective Date and until thereafter amended as
provided by law:  (a) the Articles of Incorporation of Capitol as in effect
immediately prior to the Effective Date shall be and continue to be the Articles
of Incorporation of the Surviving Corporation; and (b) the Bylaws of Capitol as
in effect immediately prior to the Effective Date shall be and continue to be
the Bylaws of the Surviving Corporation.

          2.2 On the Effective Date: (a) the directors of the Surviving
Corporation shall be [name between 7 to 13 directors]; and (b) the officers of
the Surviving Corporation shall be those persons who are the officers of Capitol
at the Effective Date. Additional members of the Board of Directors and officers
of the Surviving Corporation may be elected or appointed subsequent to the
Effective Date pursuant to the terms of the Agreement and in accordance with the
Bylaws of the Surviving Corporation. Such directors and officers shall continue
to hold office from and after the Effective Date until they shall have resigned
or shall have been legally removed or until their respective successors shall
have been elected and qualified. Removal

                                      -1-
<PAGE>
 
and replacement of such directors and officers, subject to any contractual
rights they may have, shall be governed by the Bylaws of the Surviving
Corporation and the General Corporation Law of the State of California. If, at
the Effective Date, a vacancy shall exist on the Board of Directors or in the
officers of Capitol, such vacancy may be filled in the manner provided in the
Bylaws of the Surviving Corporation.

          3.     Effect of Conversion of Shares.
                 ------------------------------ 

          3.1 Conversion of Shares of Constituent Corporations. As of the
              ------------------------------------------------
Effective Date, by virtue of the Merger and without any action on the part of
the holder of any common stock of Capitol (a "Capitol Share" or "Capitol Common
Stock") or common stock of Merger Sub:

                 (a)     Each issued and outstanding Capitol Share (other than
          fractional shares, or any shares as to which dissenters' rights have
          been perfected) shall be converted into [.0938] shares of the common
          stock, without par value, of Westamerica ("Westamerica Common Stock"
          or a "Westamerica Share").

                 (b)     Each issued and outstanding share of common stock of
          Merger Sub shall at the time of the Merger be converted into and
          become one share of the common stock of the Surviving Corporation.

                 (c)     From and after the Effective Date, the holders of
          certificates formerly representing Capitol Shares shall cease to have
          any rights with respect thereto other than any dissenters' rights they
          have perfected pursuant to Chapter 13 of the California General
          Corporation Law.

          3.2    Fractional Shares. Notwithstanding any other provision hereof,
                 -----------------
no fractional shares of Westamerica Common Stock shall be issued to holders of
Capitol Shares. In lieu thereof, each such holder entitled to a fraction of a
share of Westamerica Common Stock shall receive, at the time of surrender of the
certificate or certificates representing such holder's Capitol Shares, an amount
in cash equal to the market value per share of the Common Stock of Westamerica,
calculated by taking the average of the closing price quoted on the Nasdaq, as
reported in The Wall Street Journal, for each of the twenty consecutive trading
days prior to two business days prior to the Effective Date, rounded to 4
decimal places, (whether or not there were any trades in Westamerica Common
Stock on such days), multiplied by the fraction of a share of Westamerica Common
Stock to which such holder otherwise would be entitled. No such holder shall be
entitled to dividends, voting rights, interest on the value of, or any other
rights in respect of, a fractional share.

          3.3    Surrender of Capitol Shares.
                 --------------------------- 

          (a)    Prior to the Effective Date, Westamerica shall appoint Chemical
Trust Company of California or its successor, or any other bank or trust company
(having capital of at least $50 million) mutually acceptable to Capitol and
Westamerica, as exchange agent (the "Exchange Agent") for the purpose of
exchanging certificates representing the Westamerica Common Stock and at and
after the Effective Date, Westamerica shall issue and deliver to the Exchange
Agent certificates representing the Westamerica Common Stock, as shall be
required to be delivered to holders of Capitol Shares pursuant to Section 3.1 of
this Merger Agreement. As soon as practicable after the Effective Date, each
holder of Capitol Shares converted pursuant to Section 3.1, upon surrender to
the Exchange Agent of one or more certificates for such Capitol Shares for
cancellation, will be entitled to receive a certificate representing the number
of shares of Westamerica Common Stock determined in accordance with Section 3.1
and a payment in cash with respect to fractional shares, if any, determined in
accordance with Section 3.2. Each certificate representing Westamerica Common
Stock will bear a notation incorporating the Amended Rights Agreement (as that
term is defined in Section 5(j) of the Agreement) by reference and certificates
representing the Westamerica Common Stock will evidence and entitle the holders
thereof to certain rights as set forth in and subject to the terms of the 

                                      -2-
<PAGE>
 
Amended Rights Agreement ("Rights"). Certificates issued for the Westamerica
Common Stock shall be deemed to be certificates for said Rights.

          (b)    No dividends or other distributions of any kind which are
declared payable to shareholders of record of the Westamerica Common Stock after
the Effective Date will be paid to persons entitled to receive such certificates
for Westamerica Common Stock until such persons surrender their certificates
representing Capitol Shares. Upon surrender of such certificates representing
Capitol Shares, the holder thereof shall be paid, without interest, any
dividends or other distributions with respect to the Westamerica Common Stock as
to which the record date and payment date occurred on or after the Effective
Date and on or before the date of surrender.

          (c)    If any certificate for a Westamerica Share is to be issued in a
name other than that in which the certificate for a Capitol Share surrendered in
exchange therefor is registered, it shall be a condition of such exchange that
the person requesting such exchange shall pay to the Exchange Agent any transfer
costs, taxes or other expenses required by reason of the issuance of
certificates for such Westamerica Share in a name other than the registered
holder of the certificate surrendered, or such persons shall establish to the
satisfaction of Westamerica and the Exchange Agent that such costs, taxes or
other expenses have been paid or are not applicable.

          (d)    All dividends or distributions, and any cash to be paid
pursuant to Section 3.2 in lieu of fractional shares, if held by the Exchange
Agent for payment or delivery to the holders of unsurrendered certificates
representing Capitol Shares and unclaimed at the end of one year from the
Effective Date, shall (together with any interest earned thereon) at such time
be paid or redelivered by the Exchange Agent to Westamerica, and after such time
any holder of a certificate representing a Capitol Share who has not surrendered
such certificate to the Exchange Agent shall, subject to applicable law, look as
a general creditor only to Westamerica for payment or delivery of such dividends
or distributions or cash, as the case may be. Westamerica shall not be liable to
any holder of a share of Capitol Common Stock for such share (or dividends or
distributions with respect thereto) delivered to a public official pursuant to
any applicable abandoned property, escheat or similar law.

          4.     Termination and Amendment.
                 ------------------------- 

          4.1 The obligations of the parties to effect the Merger shall be
subject to all the terms and conditions contained in the Agreement.
Notwithstanding the approval of this Merger Agreement by the shareholders of
Capitol, this Merger Agreement shall terminate forthwith in the event that the
Agreement shall be terminated as therein provided.

          4.2 This Merger Agreement may be amended by Westamerica and Capitol at
any time prior to the Effective Date without the approval of the shareholders of
Capitol with respect to any of its terms except the terms relating to the form
or amount of consideration to be delivered to the Capitol shareholders in the
Merger. This Merger Agreement may not be amended, except by an instrument in
writing signed on behalf of each of the parties hereto.

                                      -3-
<PAGE>
 
          4.3 This Merger Agreement may be signed in any number of counterparts,
each of which shall be deemed an original, and all of which shall be deemed but
one and the same instrument.

          IN WITNESS WHEREOF, the parties have duly executed this Merger
Agreement as of the date first written above.

                                       WESTAMERICA BANCORPORATION



                                       By 
                                          ----------------------------
                                          DAVID L. PAYNE, President



                                       By 
                                          ----------------------------
                                          M. KITTY JONES, Secretary



                                       WESTAMERICA MERGER SUBSIDIARY



                                       By 
                                          ----------------------------
                                          DAVID L. PAYNE, President


                                       By 
                                          ----------------------------
                                          M. KITTY JONES, Secretary



                                       CAPITOLBANK SACRAMENTO



                                       By 
                                          ----------------------------
                                          THAYER PRENTICE, Vice-Chairman and
                                          Chief Executive Officer



                                       By 
                                          ----------------------------
                                          LAWRENCE D. McGOVERN, Secretary

                                      -4-
<PAGE>
 
                             OFFICERS' CERTIFICATE


          Thayer Prentice and Lawrence D. McGovern, hereby certify that:

          1.     They are the President and Secretary, respectively, of
CapitolBank Sacramento, a corporation organized under the laws of the State of
California.

          2.     The Merger Agreement in the form attached was duly approved by
the Board of Directors and shareholders of the corporation.

          3.     The shareholder approval was by the holders of a number of
outstanding shares which equaled or exceeded the vote required.  The percentage
vote required was more than 50% of the outstanding shares.

          4.     There is only one class of shares and the number of shares
outstanding is                 .
               ----------------                     

                                       ---------------------------
                                       THAYER PRENTICE, Vice-Chairman and
                                       Chief Executive Officer



                                       ----------------------------
                                       LAWRENCE D. MCGOVERN, Secretary


          The undersigned declare under penalty of perjury under the laws of the
State of California that they have read the foregoing certificate and know the
contents thereof and that the same is true of their own knowledge.  Executed at
Sacramento, Sacramento County, California on                   , 1995.
                                             --------------- --

                                       ----------------------------
                                       THAYER PRENTICE, Vice-Chairman and
                                       Chief Executive Officer



                                       ----------------------------
                                       LAWRENCE D. McGOVERN, Secretary

                                      -5-
<PAGE>
 
                             OFFICERS' CERTIFICATE


          David L. Payne and M. Kitty Jones hereby certify that:

          1.     They are the President and Secretary, respectively, of
Westamerica Merger Subsidiary, a corporation organized under the laws of the
State of California.

          2.     The Merger Agreement in the form attached was duly approved by
the Board of Directors of the corporation.

          3.     The Merger Agreement was entitled to be and was approved by the
Board of Directors alone under the provisions of Section 1201 of the California
General Corporation Law.

          4.     No vote of the shareholders of Westamerica Bancorporation, the
parent of Westamerica Merger Subsidiary, was required.


                                       ---------------------------
                                       DAVID L. PAYNE, President



                                       ----------------------------
                                       M. KITTY JONES, Secretary


          The undersigned declare under penalty of perjury under the laws of the
State of California that they have read the foregoing certificate and know the
contents thereof and that the same is true of their own knowledge.  Executed at
San Rafael, Marin County, California on                  , 1995.
                                        ------------ ----


                                       ----------------------------
                                       DAVID L. PAYNE



                                       ----------------------------
                                       M. KITTY JONES

                                      -6-
<PAGE>
 
                                                                     Exhibit A-2



                          Form of Agreement of Merger


          THIS AGREEMENT OF MERGER dated as of        , 1995, between
                                               -------
CAPITOLBANK SACRAMENTO, a California state-chartered banking corporation
(hereinafter referred to as "Disappearing Corporation"), and WESTAMERICA BANK, a
California state-chartered banking corporation (hereinafter referred to as
"Surviving Corporation").

                              W I T N E S S E T H:

          WHEREAS, Westamerica Bancorporation, Surviving Corporation and
Disappearing Corporation are parties to an Agreement and Plan of Reorganization
(the "Reorganization Agreement") dated as of November 17, 1994 providing for the
merger (the "Merger") of Disappearing Corporation with and into Surviving
Corporation, which is a wholly-owned subsidiary of Westamerica Bancorporation,
in the manner and with the effect set forth in the Federal Deposit Insurance
Act, the Federal Reserve Act, the California Financial Code and this Agreement.

          NOW, THEREFORE, in consideration of the premises and the mutual
agreements contained herein and in the Reorganization Agreement, the parties
hereto agree as follows:

          1.    The Merger.  On the Effective Date (as hereinafter defined)
                ----------                                                 
Disappearing Corporation shall be merged with and into Surviving Corporation in
accordance with the terms and provisions of this Agreement.  The Merger shall be
pursuant to the provisions of, and with the effect provided in, the Federal
Deposit Insurance Act, the Federal Reserve Act and the California Financial
Code, and the Merger shall become effective on the date (the "Effective Date") a
copy of this Agreement certified by the Secretary of State of California is
filed with the Superintendent of Banks of the State of California (the
"Superintendent").

          2.    Articles of Incorporation and By-laws.  The Articles of
                -------------------------------------                  
Incorporation and By-laws, respectively, of Surviving Corporation in effect
immediately prior to the Effective Date shall be and remain the Articles of
Incorporation and By-laws, respectively, of the Surviving Corporation until
amended as provided by law.

          3.    Officers and Directors. From and after the Effective Date of the
                ----------------------      
Merger, the directors and officers of Surviving Corporation shall be those
persons who are the directors and officers of Surviving Corporation at the
Effective Date of the Merger, and they shall continue to hold office from and
after the Effective Date of the Merger until they shall have resigned or shall
have been legally removed or until their respective successors shall have been
elected and qualified.

          4.    Effect of the Merger.  (a) All assets, rights, privileges,
                --------------------                                      
immunities, powers, franchises and interests of Disappearing Corporation and
Surviving Corporation in and to every type of property (real, personal and
mixed) and choses in action, as they exist as of the Effective Date, including
appointments, designations and nominations and all other rights and interests as
trustee, executor, administrator, registrar of stocks and bonds, guardian of
estates, assignee, receiver and in every other fiduciary capacity, shall pass
and be transferred to and vest in Surviving Corporation by virtue of the Merger
on the Effective Date without any deed, conveyance or other transfer; the
separate existence of Disappearing Corporation shall cease and the corporate
existence of Surviving Corporation as a state-chartered banking corporation
shall continue unaffected and unimpaired by the Merger; and Surviving
Corporation shall be deemed to be the same entity as each of Disappearing
Corporation and Surviving Corporation and shall be subject to all of their
obligations and liabilities of every kind and description.

                                      -1-
<PAGE>
 
          (b)   The Surviving Corporation shall be responsible and liable for
all the liabilities and obligations of each of Surviving Corporation and
Disappearing Corporation; and any claim existing or action or proceeding pending
by or against Surviving Corporation or Disappearing Corporation may be
prosecuted as if the Merger had not taken place, or the Surviving Corporation
may be substituted in its place. Neither the rights of creditors nor any liens
upon the property of either Surviving Corporation or Disappearing Corporation
shall be impaired by reason of the Merger.

          5.    Effect of Merger on Outstanding Shares.
                -------------------------------------- 

          (a) Surviving Corporation.  Each share of the common and preferred
              ---------------------                                         
stock of Surviving Corporation issued and outstanding immediately prior to the
Effective Date shall continue to be issued and outstanding after the Effective
Date.

          (b) Disappearing Corporation.  On the Effective Date, by virtue of
              ------------------------                                      
the Merger and without any action on the part of the holder of any capital stock
of Disappearing Corporation, each issued and outstanding share of the common
stock of Disappearing Corporation shall be cancelled without consideration.

          6.      Conditions. The obligations of the parties to effect the
                  ----------
Merger shall be subject to all of the terms and conditions contained in the
Reorganization Agreement.

          7.      Termination.  This Agreement may be terminated by the mutual
                  -----------                                                 
consent of the Boards of Directors of Disappearing Corporation, Westamerica
Bancorporation and Surviving Corporation, and may be amended by the mutual
consent of Disappearing Corporation, Westamerica Bancorporation and Surviving
Corporation at any time prior to the Effective Date without the approval of the
shareholders of Disappearing Corporation or Surviving Corporation with respect
to any of its terms.  This Agreement shall terminate automatically upon the
termination of the Reorganization Agreement.

          8.      Further Assurances.  From time to time as and when requested
                  ------------------                                   
by the Surviving Corporation and to the extent permitted by law, the officers
and directors of Disappearing Corporation and Surviving Corporation last in
office shall execute and deliver such assignments, deeds and other instruments
and shall take or cause to be taken such further or other action as shall be
necessary in order to vest or perfect in or to confirm of record or otherwise to
Surviving Corporation title to, and possession of, all of the assets, rights,
franchises and interests of Disappearing Corporation and Surviving Corporation
in and to every type of property (real, personal and mixed) and chooses in
action, and otherwise to carry out the purposes of this Agreement; and the
proper officers and directors of Surviving Corporation are fully authorized to
take any and all such action in the name of Disappearing Corporation or
Surviving Corporation or otherwise.

                                      -2-
<PAGE>
 
          9.      Counterparts.  This Agreement may be executed in several
                  ------------                                            
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

          IN WITNESS WHEREOF, the parties have duly executed this Merger
          ------------------
Agreement as of the date first written above.


ATTEST:                                                              
                                   WESTAMERICA BANK   
                                                                     
                                                                     
                                   By     
- ------------------------------        ------------------------------------------
                                       David L. Payne              
          Secretary                    President 
                                             


 
ATTEST:                            CAPITOLBANK SACRAMENTO
 
 
 
                                             
                                   By                              
- ------------------------------        ------------------------------------------
          Secretary                   Thayer Prentice              
                                      Vice-Chairman and Chief Executive Officer

                                      -3-
<PAGE>
 


                             OFFICERS' CERTIFICATE


          Thayer Prentice and                hereby certify that:
                             ---------------
          1.       They are the President and Secretary, respectively, of
CAPITOLBANK SACRAMENTO, a banking corporation organized under the laws of the
United States.

          2.       The Merger Agreement in the form attached was duly approved
by the Board of Directors of the corporation.

          3.       The Merger Agreement in the form attached was duly approved
by the holder of all of the outstanding shares of the corporation.



                                       -------------------------
                                       THAYER PRENTICE, Vice-Chairman and Chief
                                       Executive Officer


                                       -------------------------
                                       LAWRENCE D.MCGOVERN, Secretary


          The undersigned declare under penalty of perjury under the laws of the
State of California that they have read the foregoing certificate and know the
contents thereof and that the same is true of their own knowledge.  Executed at
Sacramento, Sacramento County, California on                 , 1995.
                                            ------------ ----


                                       ------------------------- 
                                       THAYER PRENTICE,Vice Chairman and Chief
                                       Executive Officer



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

                                      -4-
<PAGE>
 
                             OFFICERS' CERTIFICATE


          David L. Payne and M. Kitty Jones hereby certify that:

          1.  They are the President and Secretary, respectively, of WESTAMERICA
BANK, a banking corporation organized under the laws of the State of California.

          2.  The Merger Agreement in the form attached was duly approved by the
Board of Directors of the corporation.

          3.  The Merger Agreement was entitled to be and was approved by the
Board of Directors alone under the provisions of Section 1201 of the California
General Corporation Law.

                                      -----------------------------
                                      DAVID L. PAYNE, President


                                      ------------------------------
                                      M. KITTY JONES, Secretary 
   
The undresigned declare under penalty of purjury under the laws of the state of
California that they have read the foregoing certificate and know the contents
thereof and that the same is true of their own knowledge. Executed at San
Rafael, Marin County, California on                , 1995.
                                    ------------ --

                                      
                                      ----------------------------
                                      DAVID L. PAYNE


                                      
                                      ----------------------------
                                      M. KITTY JONES

                                               

                                      -5-
<PAGE>
 
                                                                         ANNEX B

November 17, 1994

Members of the Board of Directors
CapitolBank Sacramento
300 Capitol Mall
Sacramento, CA 95814

Members of the Board:

You have requested our opinion as investment bankers as to the fairness, from a
financial point of view, to the shareholders of CapitolBank Sacramento of the
Exchange Ratio, as defined in the Agreement and Plan of Reorganization, dated as
of November 17, 1994 (the "Agreement"), in the proposed merger (the "Merger") of
CapitolBank with and into Westamerica Bancorporation, pursuant to the Agreement
and subject to the terms and conditions therein, each holder of common stock of
CapitolBank will receive, in exchange for common stock of CapitolBank,
Westamerica common stock in the ratio of .0938 of a share of Westamerica common
stock for each share of CapitolBank common stock, subject to adjustment as more
fully set forth in the Agreement, including adjustment for Significant 
Liabilities as defined in Section 2.1(b) of the agreement.  

We have acted for CapitolBank and for the Board of Directors as financial
advisor in connection with this transaction and will receive a fee for our
services. We have not previously provided investment banking and financial
advisory services to CapitolBank. We currently are a market maker in
CapitolBank's Common Shares and have been since 1990. We are currently a market
maker in Westamerica Bancorporation's Common Stock and have been since 1994.

In arriving at our opinion, we have reviewed and analyzed, among other things,
the following: (i) the Agreement and the Amendments; (ii) Annual Reports to
Shareholders of CapitolBank and Westamerica Bancorporation and Annual Reports on
Form 10-K of Westamerica Bancorporation for the three years ended December 31,
1991, 1992 and 1993; (iii) Quarterly Reports on Form 10-Q of Westamerica
Bancorporation and quarterly FDIC Call reports for the quarters ended March 31,
1994, June 30, 1994 and September 30, 1994; (iv) certain other publicly
available financial and other information concerning CapitolBank and Westamerica
Bancorporation and the trading markets for the publicly traded securities of
CapitolBank and Westamerica Bancorporation; (v) publicly available information
concerning other banks and holding companies, the trading markets for their
securities and the nature and terms of certain other merger transactions we
believe relevant to our inquiry; and (vi) evaluations and analyses prepared and
presented to the Board of Directors of CapitolBank or a committee thereof in
connection with this business combination with Westamerica Bancorporation. We
have held discussions with senior management of CapitolBank and of Westamerica
Bancorporation concerning their past and current operations, financial condition
and prospects, as well as the results of regulatory examinations.

We have reviewed with senior management of CapitolBank earnings projections for
1995 through 1998 for CapitolBank as a stand-alone entity, assuming the Merger
does not occur, prepared by CapitolBank. We reviewed with the senior management
of Westamerica Bancorporation earnings projections for 1995 through 1998 for
Westamerica Bancorporation as a stand-alone entity, assuming the Merger does not
occur, as well as projected operating cost savings expected to be achieved in
each such years resulting from the Merger. Such projections were prepared by
Westamerica Bancorporation senior management. Certain pro forma financial
projections for the years 1995 through 1998 for the combined entity were derived
by us based partially upon the projections discussed above, as well as our own
assessment of general economic, market and financial conditions. In certain
cases, such combined pro forma financial projections included projected
operating cost savings derived by us partially based upon the projections
discussed above to be realizable in the Merger.

In conducting our review and in arriving at our opinion, we have relied upon and
assumed the accuracy and completeness of the financial and other information
provided to us or publicly available and have not

                                      -1-
<PAGE>
 
attempted independently to verify the same. We have relied upon the managements
of CapitolBank and Westamerica Bancorporation as to the reasonableness of the
financial and operating forecasts, projections and projected operating cost
savings (and the assumptions and bases therefor) provided to us, and we have
assumed that such forecasts, projections and projected operating cost savings
reflect the best currently available estimates and judgments of the applicable
managements. We have also assumed, without independent verification, that the
aggregate allowances for loan losses for CapitolBank and Westamerica
Bancorporation are adequate to cover such losses. We have not made or obtained
any evaluations or appraisals of the property of CapitolBank or Westamerica
Bancorporation, nor have we examined any individual loan credit files. For
purposes of this opinion, we have assumed that the Merger will have the tax,
accounting and legal effects (including, without limitation, that the Merger
will be accounted for as a pooling-of-interest) described in the Agreement and
the Amendments and assumed the accuracy of the disclosures set forth in the
Agreement and the Amendments. Our opinion as expressed herein is limited to the
fairness, from a financial point of view, to the holders of the Common Shares of
CapitolBank of the Exchange Ratio in the Merger and does not address
CapitolBank's underlying business decision to proceed with the Merger.

We have considered such financial and other factors as we have deemed
appropriate under the circumstances, including among others the following: (i)
the historical and current financial position and results of operations of
CapitolBank and Westamerica Bancorporation, including interest income, interest
expense, net interest income, net interest margin, provision for loan losses,
non-interest income, non-interest expense, earnings, dividends, internal capital
generation, book value, intangible assets, return on assets, return on
shareholders' equity, capitalization, the amount and type of nonperforming
assets, loan losses and the reserve for loan losses, all as set forth in the
financial statements for CapitolBank and for Westamerica Bancorporation; (ii)
the assets and liabilities of CapitolBank and Westamerica Bancorporation,
including the loan, investment and mortgage portfolios, deposits, other
liabilities, historical and current liability sources and costs and liquidity;
and (iii) the nature and terms of certain other merger transactions involving
banks and bank holding companies. We have also taken into account our assessment
of general economic, market and financial conditions and our experience in other
transactions, as well as our experience in securities valuation and our
knowledge of the banking industry generally. Our opinion is necessarily based
upon conditions as they exist and can be evaluated on the date hereof and the
information made available to us through the date hereof.

It is understood that this letter is for the information of the Board of
Directors of CapitolBank only and may not be relied upon by any other person or
used for any other purpose without our prior written consent. This letter does
not constitute a recommendation to the Board of Directors or to any shareholder
of CapitolBank with respect to any approval of the Merger.

Based upon and subject to the foregoing, we are of the opinion as investment
bankers that, as of the date hereof, the Exchange Ratio in the Merger is fair,
from a financial point of view, to the holders of the Common Shares of
CapitolBank.

Very truly yours,

/s/ Hoefer & Arnett Incorporated                       

HOEFER & ARNETT INCORPORATED

                                      -2-
<PAGE>
 
                                                                         ANNEX C


CAPITOLBANK SACRAMENTO
- ----------------------
November 16, 1994




Board of Directors
CapitolBank Sacramento
300 CapitolBank Mall
Sacramento, California 95814


Members of the Board

     We understand that CapitolBank Sacramento, a California banking corporation
("CapitolBank"), and Westamerica Bancorporation, a California corporation
("Westamerica"), have entered into an Agreement and Plan of Reorganization (the
"Agreement"), pursuant to which Westamerica will acquire CapitolBank and the
goodwill associated therewith through the merger of CapitolBank with a
Westamerica subsidiary (the "Merger"). Pursuant to the Merger and subject to the
terms and conditions more fully described in the Agreement, we understand that
each holder of common stock, $1.5625 par value, of CapitolBank will receive, in
exchange for common stock of CapitolBank, Westamerica common stock in the ratio
of .0938 of a share of Westamerica common stock for each share of CapitolBank
common stock, subject to adjustment as more fully set forth in the Agreement
(the "Consideration").

     Smith & Crowley Inc. ("SCI") is an investment banking firm specializing in
commercial banks, savings and loan associations, savings banks, and other
financial intermediaries, and, as part of its investment banking activities, is
called upon to advise clients in mergers, acquisitions, valuations, and business
activities involving financial institutions.  SCI has had no prior business
relationships with either party to this transaction; however, certain principals
of SCI, in former positions as senior officers of investment banking and
commercial banking companies, did, in the course of their activities in past
years, have direct contact with Westamerica, its management, and banks that were
owned or were subsequently acquired by Westamerica.  SCI will receive a fee from
CapitolBank for rendering this opinion.

     You have asked for our opinion as to whether the Consideration to be
received by the stockholders of CapitolBank pursuant to the Merger is fair to
such stockholders of CapitolBank from a financial point of view, as of the date
hereof.

     In connection with our opinion, we have, among other things:

     (i)     reviewed certain publicly available financial and other data with
             respect to CapitolBank and Westamerica, including the annual
             audited consolidated financial statements for 1989 through 1993,
             unaudited interim periods to September 30, 1994, and certain other
             relevant financial and operating data relating to CapitolBank and
             Westamerica made available to us from published sources and from
             the internal records of CapitolBank and Westamerica;

     (ii)    reviewed the form of the Merger Agreement and made inquiries
             regarding and discussed the Merger, the Merger Agreement and other
             matters related thereto with CapitolBank's management and counsel;
             we also analyzed the effect of adjustments in the Merger Exchange
             Ratio potentially attributable to Significant Liabilities as
             defined in the Agreement, including the effect of the maximum
             Significant Liabilities adjustment, which would reduce the Exchange
             Ratio to .0861;

     (iii)   compared CapitolBank and Westamerica from a financial point of view
             with certain other companies and groups of companies in the banking
             industry that we deemed to be relevant;

                                      -1-
<PAGE>
 
     (iv)    considered the financial terms, to the extent publicly available,
             of selected recent business combinations of companies in the
             banking industry, which we deemed to be comparable, in whole or in
             part, to the Merger;

     (v)     reviewed and discussed with representatives of the management of
             CapitolBank certain information of a business and financial nature
             regarding CapitolBank, furnished to us by them, including legal 
             matters, lease agreements, credit quality data, financial 
             forecasts and related assumptions of CapitolBank;

     (vi)    reviewed and discussed with representatives of the management of
             Westamerica certain information of a business and financial nature
             regarding Westamerica, furnished to us by them concerning the
             holding company and its principal subsidiaries, including current
             financial condition, credit quality data, other pending
             transactions, and general business plans;

     (vii)   reviewed the price history, trading volume and valuation of
             Westamerica common stock and, subject to more limited availability 
             of information, that of CapitolBank as well;

     (viii)  met with various officers and other members of management of
             CapitolBank and Westamerica to discuss the foregoing, as well as
             other matters we believe relevant to our analysis; and

     (ix)    considered such other information, financial data and analyses, and
             economic and market criteria and performed such other analyses and
             examinations as we have deemed appropriate.

     In connection with our review, we have not assumed any responsibility for
independent verification of any of the foregoing information and have relied on
all such information and assumed that all such information provided by
CapitolBank and Westamerica is complete and accurate in all material respects.
With respect to the financial forecasts of CapitolBank provided to us by
CapitolBank's management, we have assumed for purposes of our opinion that such
forecasts have been reasonably prepared on bases reflecting the best available
estimates and judgments of CapitolBank's management at the time of preparation
as to the future financial performance of CapitolBank, and that they provide a
reasonable basis upon which we can form our opinion. We have also assumed that
there have been no material changes in CapitolBank's assets, financial
condition, results of operations, business or prospects since the date of the
last financial statements made available to us, including without limitation
those arising out of any claims that may be made or are pending or threatened
by, against or for the benefit of CapitolBank. We have relied on advice of
counsels to CapitolBank as to all legal matters with respect to CapitolBank, the
Merger and the Agreement. We are not experts in the evaluation of loan
portfolios for purposes of assessing the adequacy of the allowance for losses
with respect thereto and have assumed, with your consent, that such allowances
for CapitolBank and Westamerica are in the aggregate adequate to cover such
losses. In addition, we have not assumed any responsibility for reviewing any
individual credit files or making an independent evaluation, appraisal or
physical inspection of the assets or individual properties of CapitolBank or
Westamerica. Finally, our opinion is based on economic, monetary, market and
other conditions as in effect on, and the information made available to us as
of, the date hereof.

     We have further assumed, with your consent, that the Merger will be
consummated in accordance with the terms described in the form of the Agreement
provided to us, without any amendments thereto and without waiver by CapitolBank
of any of the conditions to its obligations thereunder.

     Based on the foregoing and in reliance thereon, it is our opinion that the
Consideration to be received by the stockholders of CapitolBank pursuant to the
Merger is fair to such stockholders from a financial point of view, as of the
date hereof.

                                      -2-
<PAGE>
 
       This opinion is furnished pursuant to our engagement letter dated 
November 10, 1994.  Except as provided in such engagement letter, 
this opinion may not be used or referred to by CapitolBank, or quoted or 
disclosed to any person in any manner without our prior written consent.  
This opinion is not intended to be and shall not be deemed to be a 
recommendation to any stockholder of CapitolBank as to how such stockholder 
should vote in respect to the Merger.


Respectfully submitted,



SMITH & CROWLEY INC.


By: 
    ----------------------
    Donald K. Crowley
    Managing Director

                                      -3-
<PAGE>
 
                                                                         ANNEX D

                            STOCK OPTION AGREEMENT


     THIS STOCK OPTION AGREEMENT, dated as of November 17, 1994, between
WESTAMERICA BANCORPORATION, a California corporation ("Grantee"), and
CAPITOLBANK SACRAMENTO, a California corporation ("Issuer").

                              W I T N E S S E T H:

     WHEREAS, Grantee and Issuer have entered into an Agreement and Plan of
Reorganization of even date herewith (the "Reorganization Agreement"), which
agreement has been executed by the parties hereto immediately prior to this
Agreement; and

     WHEREAS, as a condition to Grantee's entering into the Reorganization
Agreement and in consideration therefor, Issuer has agreed to grant Grantee the
Option (as hereinafter defined):

     NOW, THEREFORE, in consideration of the foregoing and the mutual covenants
and agreements set forth herein and in the Reorganization Agreement, the parties
hereto agree as follows:

     1.     (a)     Issuer hereby grants to Grantee an unconditional,
irrevocable option (the "Option") to purchase, subject to the terms hereof, up
to 403,949 fully paid and nonassessable shares of Issuer's Common Stock, no par
value per share ("Common Stock"), at a price of $2.27 per share; provided,
                                                                 ---------
however, that in the event Issuer issues or agrees to issue any shares of 
- --------
Common Stock (other than as permitted under the Reorganization Agreement) at a
price less than $2.27 per share (as adjusted pursuant to subsection (b) of
Section 5), such price shall be equal to such lesser price (such price, as
adjusted if applicable, the "Option Price"); provided further that in no event
                                             ----------------  
shall the number of shares for which this Option is exercisable exceed 9.9% of
the Issuer's issued and outstanding common shares. The number of shares of
Common Stock that may be received upon the exercise of the Option and the Option
Price are subject to adjustment as herein set forth.

     (b)     In the event that any additional shares of Common Stock are issued
or otherwise become outstanding after the date hereof (or any treasury shares
held by Issuer have been or are sold after November 17, 1994) (other than
pursuant to this Agreement), the number of shares of Common Stock subject to the
Option shall be increased so that, after such issuance, it equals 9.9% of the
number of shares of Common Stock then issued and outstanding without giving
effect to any shares subject to or issued pursuant to the Option. Nothing
contained in this Section 1(b) or elsewhere in this Agreement shall be deemed to
authorize Issuer or Grantee to breach any provision of the Reorganization
Agreement.

     2.     (a)     The Holder (as hereinafter defined) may exercise the Option,
in whole or part, and from time to time, if, but only if, both an Initial
Triggering Event (as hereinafter defined) and a Subsequent Triggering Event (as
hereinafter defined) shall have occurred prior to the occurrence of an Exercise
Termination Event (as hereinafter defined), provided that the Holder shall have
                                            --------                           
sent the written notice of such exercise (as provided in subsection (e) of this
Section 2) within 30 days following such Subsequent Triggering Event. Each of
the following shall be an Exercise Termination Event: (i) the Effective Time of
the Merger; (ii) termination of the Reorganization Agreement in accordance with
the provisions thereof if such termination occurs prior to the occurrence of an
Initial Triggering Event; or (iii) the passage of 12 months after termination of
the Reorganization Agreement if such termination follows the occurrence of an
Initial Triggering Event (provided that if an Initial Triggering Event continues
                          --------                                              
or occurs beyond such termination, the Exercise Termination Event shall be 12
months from the expiration of the Last Triggering Event but in no event more
than 18 months after such termination). The "Last Triggering Event" shall mean
the last Initial Triggering Event to occur. The term "Holder" shall mean the
holder or holders of the Option.


<PAGE>
 
     (b)     The term "Initial Triggering Event" shall mean any of the following
events or transactions occurring after the date hereof:


             (i)     Issuer or any of its Subsidiaries (each an "Issuer
     Subsidiary"), without having received Grantee's prior written consent,
     shall have entered into an agreement to engage in an Acquisition
     Transaction (as hereinafter defined) with any person (the term "person" for
     purposes of this Agreement having the meaning assigned thereto in Sections
     3(a)(9) and 13(d)(3) of the Securities and Exchange Act of 1934 (the
     "Exchange Act"), and the rules and regulations thereunder) other than
     Grantee or any of its Subsidiaries (each a "Grantee Subsidiary") or the
     Board of Directors of Issuer shall have recommended that the shareholders
     of Issuer approve or accept any Acquisition Transaction other than as
     contemplated by the Reorganization Agreement. For purposes of this
     Agreement, "Acquisition Transaction" shall mean (x) a merger or
     consolidation, or any similar transaction, involving Issuer or any
     Significant Subsidiary (as defined in Rule 1-02 of Regulation S-X
     promulgated by the Securities and Exchange Commission (the "SEC") of
     Issuer, (y) a purchase, lease or other acquisition representing 15% or more
     of the consolidated assets of Issuer and its Subsidiaries, or (z) a
     purchase or other acquisition (including by way of merger, consolidation,
     share exchange or otherwise) of securities representing 10% or more of the
     voting power of any class of securities of Issuer or any Significant
     Subsidiary of Issuer;

             (ii)    Issuer or any Issuer Subsidiary, without having received
     Grantee's prior written consent, shall have authorized, recommended,
     proposed or publicly announced its intention to authorize, recommend or
     propose, an agreement to engage in an Acquisition Transaction with any
     person other than Grantee or a Grantee Subsidiary, or the Board of
     Directors of Issuer shall have publicly withdrawn or modified, or publicly
     announced its interest to withdraw or modify, its recommendation that the
     shareholders of Issuer approve the transactions contemplated by the
     Reorganization Agreement;

             (iii)   Any person other than Grantee, any Grantee Subsidiary or
     any Issuer Subsidiary acting in a fiduciary capacity shall have acquired
     beneficial ownership or the right to acquire beneficial ownership of 10% or
     more of the outstanding shares of Common Stock (the term "beneficial
     ownership" for purposes of this Agreement having the meaning assigned
     thereto in Section 13(d) of the Exchange Act, and the rules and regulations
     thereunder);

             (iv)    Any person other than Grantee or any Grantee Subsidiary
     shall have made a bona fide proposal to Issuer or its shareholders by
     public announcement or written communication that is or becomes the subject
     of public disclosure to engage in an Acquisition Transaction;

             (v)     After a proposal is made by a third party to Issuer or its
     shareholders to engage in an Acquisition Transaction, Issuer shall have
     breached any covenant or obligation contained in the Reorganization
     Agreement and such breach (x) would entitle Grantee to terminate the
     Reorganization Agreement and (y) shall not have been cured prior to the
     Notice Date (as defined below); or

             (vi)    Any person other than Grantee or any Grantee Subsidiary,
     other than in connection with a transaction to which Grantee has given its
     prior written consent, shall have filed an application or notice with the
     Superintendent of Banks of the State of California (the "Superintendent")
     or the Federal Deposit Insurance Corporation (the "FDIC"), or any other
     federal or state bank regulatory authority, which application or notice has
     been accepted for processing, for approval to engage in an Acquisition
     Transaction.

                                      -2-
<PAGE>
 
     (c)     The term "Subsequent Triggering Event" shall mean either of the
following events or transactions occurring after the date hereof:

             (i)     The acquisition by any person of beneficial ownership of
     20% or more of the then outstanding Common Stock; or

             (ii)    The occurrence of the Initial Triggering Event described in
     clause (i) of subsection (b) of this Section 2, except that the percentage
     referred to in clause (z) shall be 20%.

     (d)     Issuer shall notify Grantee promptly in writing of the occurrence
of any Initial Triggering Event or Subsequent Triggering Event (together, a
"Triggering Event"), it being understood that the giving of such notice by
Issuer shall not be a condition to the right of the Holder to exercise the
Option.

     (e)     In the event the Holder is entitled to and 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 shares it
will purchase pursuant to such exercise and (ii) a place and date not earlier
than three business days nor later than 60 business days from the Notice Date
for the closing of such purchase (the "Closing Date"); provided, that if the
                                                       --------             
closing of the purchase and sale pursuant to the Option (the "Closing") cannot
be consummated by reason of any applicable judgment, decree, order, law or
regulation, the period of time that otherwise would run pursuant to this
sentence shall run instead from the date on which such restriction on
consummation has expired or been terminated; and provided further, without
                                                 ----------------         
limiting the foregoing, that if prior notification to or approval of the
Superintendent and the FDIC or any other regulatory agency is required in
connection with such purchase, the Holder shall promptly file the required
notice or application for approval and shall expeditiously process the same and
the period of time that otherwise would run pursuant to this sentence shall run
instead from the date on which any required notification periods have expired or
been terminated or such approvals have been obtained and any requisite waiting
period or periods shall have passed.  Any exercise of the Option shall be deemed
to occur on the Notice Date relating thereto.  In the event (i) Grantee receives
official notice that an approval of the Superintendent or the FDIC or any other
regulatory authority required for the purchase of Option Shares (as hereinafter
defined) would not be issued or granted, or (ii) Holder (or Substitute Holder)
shall have the right pursuant to the last sentence of Section 7 (or Section 9)
to exercise the Option (or Substitute Option), Grantee shall nevertheless be
entitled to exercise its right as set forth in Section 7 and Grantee or Holder
(or Substitute Holder) shall be entitled to exercise the Option (or Substitute
Option) in connection with the resale of Issuer's Common Stock or other
securities pursuant to a registration statement as provided in Section 6.

     (f)     At the Closing referred to in subsection (e) of this Section 2, the
Holder shall pay to Issuer the aggregate purchase price for the shares of Common
Stock purchased pursuant to the exercise of the Option in immediately available
funds by wire transfer to a bank account designated by Issuer, provided that
                                                               --------     
failure or refusal of Issuer to designate such a bank account shall not preclude
the Holder from exercising the Option.

     (g)     At such Closing, simultaneously with the delivery of immediately
available funds as provided in subsection (f) of this Section 2, Issuer shall
deliver to the Holder a certificate or certificates representing the number of
shares of Common Stock purchased by the Holder and, if the Option should be
exercised in part only, a new Option evidencing the rights of the Holder thereof
to purchase the balance of the shares purchasable hereunder, and the Holder
shall deliver to Issuer a copy of this Agreement and a letter agreeing that the
Holder will not offer to sell or otherwise dispose of such shares in violation
of applicable law or the provisions of this Agreement.

     (h)     Certificates for Common Stock delivered at a closing hereunder may
be endorsed with a restrictive legend that shall read substantially as follows:

     "The transfer of the shares represented by this certificate is subject to
     certain provisions of an agreement between the registered holder hereof and
     Issuer and to resale restrictions 

                                      -3-
<PAGE>
 
     arising under the Securities Act of 1933, as amended. A copy of such
     agreement is on file at the principal office of Issuer and will be provided
     to the holder hereof without charge upon receipt by Issuer of a written
     request therefor."

It is understood and agreed that:  (i) the reference to the resale restrictions
of the Securities Act of 1933 (the "Securities Act") in the above legend shall
be removed by delivery of substitute certificate(s) without such reference if
the Holder shall have delivered to Issuer a copy of a letter from the staff of
the SEC, or an opinion of counsel, in form and substance reasonably satisfactory
to Issuer, to the effect that such legend is not required for purposes of the
Securities Act; (ii) the reference to the provisions of this Agreement in the
above legend shall be removed by delivery of substitute certificate(s) without
such reference if the shares have been sold or transferred in compliance with
the provisions of this Agreement and under circumstances that do not require the
retention of such reference; and (iii) the legend shall be removed in its
entirety if the conditions in the preceding clauses (i) and (ii) are both
satisfied.  In addition, such certificates shall bear any other legend as may be
required by law.

     (i)     Upon the giving by the Holder to Issuer of the written notice of
exercise of the Option provided for under subsection (e) of this Section 2 and
the tender of the applicable purchase price in immediately available funds, the
Holder shall be deemed to be the holder of record of the shares of Common Stock
issuable upon such exercise, notwithstanding that the stock transfer books of
Issuer shall then be closed or that certificates representing such shares of
Common Stock shall not then be actually delivered to the Holder or the Issuer
shall have failed or refused to designate the bank account described in
subsection (f) of this Section 2.  Issuer shall pay all expenses, and any and
all United States federal, state and local taxes and other charges that may be
payable in connection with the preparation, issuance and delivery of stock
certificates under this Section 2 in the name of the Holder or its assignee,
transferee or designee.

     3.      Issuer agrees:  (i) that it shall at all times maintain, free from
preemptive rights, sufficient authorized but unissued or treasury shares of
Common Stock (and other securities issuable pursuant to Section 5(a)) so that
the Option may be exercised without additional authorization of Common Stock (or
such other securities) after giving effect to all other options, warrants,
convertible securities and other rights to purchase Common Stock (or such other
securities); (ii) that it will not, by charter amendment or through
reorganization, consolidation, merger, dissolution or sale of assets, or by any
other voluntary act, avoid or seek to avoid the observance or performance of any
of the covenants, stipulations or conditions to be observed or performed
hereunder by Issuer; (iii) promptly to take all action as may from time to time
be required (including (x) complying with all premerger notification, reporting
and waiting period requirements specified in 15 U.S.C. (S) 18a and regulations
promulgated thereunder and (y) in the event, under the Bank Holding Company Act
of 1956, as amended ("BHCA"), or the Change in Bank Control Act of 1978, as
amended, or any state banking law, prior approval of or notice to the
Superintendent or the FDIC or to any state regulatory authority is necessary
before the Option may be exercised, cooperating fully with the Holder in
preparing such applications or notices and providing such information to the
Superintendent or the FDIC or such state regulatory authority as they may
require) in order to permit the Holder to exercise the Option and the Issuer
duly and effectively to issue shares of Common Stock pursuant hereto; and (iv)
promptly to take all action provided herein to protect the rights of the Holder
against dilution.

     4.      This Agreement (and the Option granted hereby) are exchangeable,
without expense, at the option of the Holder, 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,
on the same terms and subject to the same conditions as are set forth herein, in
the aggregate the same number of shares of Common Stock purchasable hereunder.
The terms "Agreement" and "Option" as used herein include any Stock Option
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

                                      -4-
<PAGE>
 
delivered shall constitute an additional contractual obligation on the part of
Issuer, whether or not the Agreement so lost, stolen, destroyed or mutilated
shall at any time be enforceable by anyone.

     5.     In addition to the adjustment in the number of shares of Common
Stock that are purchasable upon exercise of the Option pursuant to Section 1 of
this Agreement, the number of shares of Common Stock purchasable upon the
exercise of the Option shall be subject to adjustment from time to time as
provided in this Section 5.

            (a)     In the event of any change in Common Stock by reason of
     stock dividends, split-ups, mergers, recapitalizations, combinations,
     subdivisions, conversions, exchanges of shares or the like, the type and
     number of shares of Common Stock purchasable upon exercise hereof shall be
     appropriately adjusted so that Grantee shall receive upon exercise of the
     Option and payment of the aggregate Option Price hereunder the number and
     class of shares or other securities or property that Grantee would have
     received in respect of Common Stock if the Option had been exercised in
     full immediately prior to such event, or the record date therefor, as
     applicable.

            (b)     Whenever the number of shares of Common Stock purchasable
     upon exercise hereof is adjusted as provided in this Section 5, the Option
     Price shall be adjusted by multiplying the Option Price by a fraction, the
     numerator of which shall be equal to the number of shares of Common Stock
     purchasable prior to the adjustment and the denominator of which shall be
     equal to the number of shares of Common Stock purchasable after the
     adjustment.

     6.     Upon the occurrence of a Subsequent Triggering Event that occurs
prior to an Exercise Termination Event (or as otherwise provided in the last
sentence of Section 2(e)), Issuer shall, at the request of Grantee delivered
within 30 days after such Subsequent Triggering Event (or such trigger date as
is provided in the last sentence of Section 2(e)) (whether on its own behalf or
on behalf of any subsequent holder of this Option (or part thereof) or any of
the shares of Common Stock issued pursuant hereto), promptly prepare, file and
keep current with the Superintendent the equivalent of a shelf registration
statement under the Securities Act covering any shares issued and issuable
pursuant to this Option and shall use its best efforts to cause such
registration statement to become effective and remain current in order to permit
the sale or other disposition of any shares of Common Stock issued upon total or
partial exercise of this Option ("Option Shares") in accordance with any plan of
disposition requested by Grantee. Issuer will use its best efforts to cause such
registration statement first to become effective and then to remain effective
for such period not in excess of 180 days from the day such registration
statement first becomes effective or such shorter time as may be reasonably
necessary to effect such sales or other dispositions. Grantee for a period of 18
months following such first request shall have the right to demand a second such
registration if reasonably necessary to effect such sales or dispositions. The
foregoing notwithstanding, if, at the time of any request by Grantee for
registration of Option Shares as provided above, Issuer is in registration with
respect to an underwritten public offering of shares of Common Stock, and if in
the good faith judgment of the managing underwriter or managing underwriters,
or, if none, the sole underwriter or underwriters, of such offering the
inclusion of the Holder's Option or Option Shares would interfere with the
successful marketing of the shares of Common Stock offered by Issuer, the number
of Option Shares otherwise to be covered in the registration statement
contemplated hereby may be reduced; and provided, however, that after any such
                                        -----------------                     
required reduction the number of Option Shares to be included in such offering
for the account of the Holder shall constitute at least 25% of the total number
of shares to be sold by the Holder and Issuer in the aggregate; and provided
                                                                    --------
further, however, that if such reduction occurs, then the Issuer shall file a
- -------                                                                      
registration statement for the balance as promptly as practical and no reduction
shall thereafter occur (and such registration shall not be charged against the
Holder).  Each such Holder shall provide all information reasonably requested by
Issuer for inclusion in any registration statement to be filed hereunder.  If
requested by any such Holder in connection with such registration, Issuer shall
become a party to any underwriting agreement relating to the sale of such
shares, but only to the extent of obligating itself in respect of
representations, warranties, indemnities and other agreements customarily
included in such underwriting agreements for the Issuer.  Upon receiving any
request 

                                      -5-
<PAGE>
 
under this Section 6 from any Holder, Issuer agrees to send a copy thereof to
any other person known to Issuer to be entitled to registration rights under
this Section 6, in each case by promptly mailing the same, postage prepaid, to
the address of record of the persons entitled to receive such copies.

     7.     (a)     Upon the occurrence of a Subsequent Triggering Event that
occurs prior to an Exercise Termination Event, (i) at the request of the Holder,
delivered within 30 days after such occurrence (or such later period as provided
in Section 10 or the last sentence of Section 2(e)), Issuer (or any successor
thereto) shall repurchase the Option from the Holder at a price (the "Option
Repurchase Price") equal to (x) the amount by which (A) the market/offer price
(as defined below) exceeds (B) the Option Price, multiplied by the number of
shares for which this Option may then be exercised plus (y) Grantee's Out-of-
Pocket Expenses (as defined below) (to the extent said Expenses exceed $600,000
and were not previou sly reimbursed) and (ii) at the request of the owner of
Option Shares from time to time (the "Owner"), delivered within 30 days after
such occurrence (or such later period as provided in Section 10), Issuer shall
repurchase such number of the Option Shares from the Owner as the Owner shall
designate at a price (the "Option Share Repurchase Price") equal to (x) the
market/offer price multiplied by the number of Option Shares so designated plus
(y) Grantee's Out-of-Pocket Expenses (to the extent said Expenses exceed
$600,000 and were not previously reimbursed).  The term "Out-of-Pocket Expenses"
shall mean Grantee's reasonable out-of-pocket expenses incurred in connection
with the transactions contemplated by the Reorganization Agreement, including,
without limitation, legal, accounting and investment banking fees.  The term
"market/offer price" shall mean the highest of (i) the highest price per share
of Common Stock at which a tender offer or exchange offer therefor has been
made, (ii) the price per share of Common Stock to be paid by any third party
pursuant to an agreement with Issuer, (iii) the highest bid price per share as
quoted on the National Association of Securities Dealers Automated Quotation
Systems ("Nasdaq"), (or, if the shares of Common Stock are not quoted thereon,
on the principal trading market on which such shares are traded as reported by a
recognized source) within the six-month period immediately preceding the date
the Holder gives notice of the required repurchase of Option Shares, as the case
may be, or (iv) in the event of a sale of assets representing 15% or more of the
consolidated assets of Issuer and its Subsidiaries, the sum of the price paid in
such sale for such assets and the current market value of the remaining assets
of Issuer as determined by a nationally recognized investment banking firm
selected by the Holder or the Owner, as the case may be, divided by the number
of shares of Common Stock of Issuer outstanding at the time of such sale.  In
determining the market/offer price, the value of consideration other than cash
shall be determined by a nationally recognized investment banking firm selected
by the Holder or Owner, as the case may be.

     (b)    The Holder and the Owner, as the case may be, may exercise its right
to require Issuer to repurchase the Option and any Option Shares pursuant to
this Section 7 by surrendering for such purpose to Issuer, at its principal
office, a copy of this Agreement or certificates for Option Shares, as
applicable, accompanied by a written notice or notices stating that the Holder
or the Owner, as the case may be, elects to require Issuer to repurchase this
Option and/or the Option Shares in accordance with the provisions of this
Section 7. As promptly as practicable, and in any event within five business
days after the surrender of the Option and/or certificates representing Option
Shares and the receipt of such notice or notices relating thereto, Issuer shall
deliver or cause to be delivered to the Holder the Option Repurchase Price
and/or to the Owner the Option Share Repurchase Price therefor or the portion
thereof that Issuer is not then prohibited under applicable law and regulation
from so delivering.

     (c)    To the extent that Issuer is prohibited under applicable law or
regulation, or as a consequence of administrative policy, from repurchasing the
Option and/or the Option Shares in full, Issuer shall immediately so notify the
Holder and/or the Owner and thereafter deliver or cause to be delivered, from
time to time, to the Holder and/or the Owner, as appropriate, the portion of the
Option Repurchase Price and the Option Share Repurchase Price, respectively,
that it is no longer prohibited from delivering, within five business days after
the date on which Issuer is no longer so prohibited; provided, however, that if
                                                     -----------------
Issuer at any time after delivery of a notice of repurchase pursuant to
paragraph (b) of this Section 7 is prohibited under applicable law or
regulation, or as a consequence of administrative policy, from delivering to the
Holder and/or the Owner, as appropriate, the Option Repurchase Price and the
Option Share Repurchase Price, respectively, in full (and Issuer hereby
undertakes to use its best efforts to obtain all required regulatory and

                                      -6-
<PAGE>
 
legal approvals and to file any required notices as promptly as practicable in
order to accomplish such repurchase), the Holder or Owner may revoke its notice
of repurchase of the Option or the Option Shares either in whole or to the
extent of the prohibition, whereupon, in the latter case, Issuer shall promptly
(i) deliver to the Holder and/or the Owner, as appropriate, that portion of the
Option Repurchase Price or the Option Share Repurchase Price that Issuer is not
prohibited from delivering; and (ii) deliver, as appropriate, either (A) to the
Holder, a new Stock Option Agreement evidencing the right of the Holder to
purchase that number of shares of Common Stock obtained by multiplying the
number of shares of Common Stock for which the surrendered Stock Option
Agreement was exercisable at the time of delivery of the notice of repurchase by
a fraction, the numerator of which is the Option Repurchase Price less the
portion thereof theretofore delivered to the Holder and the denominator of which
is the Option Repurchase Price, or (B) to the Owner, a certificate for the
Option Shares it is then so prohibited from repurchasing. If an Exercise
Termination Event shall have occurred prior to the date of the notice by Issuer
described in the first sentence of this subsection (c), or shall be scheduled to
occur at any time before the expiration of a period ending on the thirtieth day
after such date, the Holder shall nonetheless have the right to exercise the
Option until the expiration of such 30 day period.

     8.     (a)     In the event that prior to an Exercise Termination Event,
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 Common Stock shall
be changed into or exchanged for stock or other securities of any other person
or cash or any other property or the then outstanding shares of Common Stock
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 provision 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 the Holder, of either (x) the Acquiring Corporation
(as hereinafter defined) or (y) any person that controls the Acquiring
Corporation.

     (b)    The following terms have the meanings indicated:

            (1)     "Acquiring Corporation" shall mean (i) the continuing or
     surviving corporation of a consolidation or merger with Issuer (if other
     than Issuer), (ii) Issuer in a merger in which Issuer is the continuing or
     surviving person, and (iii) the transferee of all or substantially all of
     Issuer's assets.

            (2)     "Substitute Common Stock" shall mean the common stock issued
     by the issuer of the Substitute Option upon exercise of the Substitute
     Option.

            (3)     "Assigned Value" shall mean the market/offer price, as
     defined in Section 7.

            (4)     "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 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 person merging into
     Issuer or by any company which controls or is controlled by such person, as
     the Holder may elect.

     (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 

                                      -7-
<PAGE>
 
possible and in no event less advantageous to the Holder. The issuer of the
Substitute Option shall also enter into an agreement with the then Holder or
Holders of the Substitute Option in substantially the same form as this
Agreement (after giving effect for such purpose to the provisions of Section 9),
which agreement shall be applicable to the Substitute Option.

     (d)     The Substitute Option shall be exercisable for such number of
shares of Substitute Common Stock as is equal to the Assigned Value multiplied
by the number of shares of Common Stock for which the Option is then
exercisable, divided by the Average Price. The exercise price of the Substitute
Option per share of Substitute Common Stock shall then be equal to the Option
Price multiplied by a fraction, the numerator of which shall be the number of
shares of Common Stock for which the Option is then exercisable and the
denominator of which shall be the number of shares of Substitute Common Stock
for which the Substitute Option is exercisable.

     (e)     In no event, pursuant to any of the foregoing paragraphs, shall the
Substitute Option be exercisable for more than 9.9% of the shares of Substitute
Common Stock outstanding prior to exercise of the Substitute Option.  In the
event that the Substitute Option would be exercisable for more than 9.9% of the
shares of Substitute Common Stock outstanding prior to exercise but for this
clause (e), the issuer of the Substitute Option (the "Substitute Option Issuer")
shall make a cash payment to Holder equal to the excess of (i) the value of the
Substitute Option without giving effect to the limitation in this clause (e)
over (ii) the value of the Substitute Option after giving effect to the
limitation in this clause (e).  This difference in value shall be determined by
a nationally recognized investment banking firm selected by the Holder.

     (f)     Issuer shall not enter into any transaction described in subsection
(a) of this Section 8 unless the Acquiring Corporation and any person that
controls the Acquiring Corporation assume in writing all the obligations of
Issuer hereunder.

     9.      (a)     At the request of the holder of the Substitute Option (the
Substitute Option Holder"), the issuer of the Substitute Option (the "Substitute
Option Issuer") shall repurchase the Substitute Option from the Substitute
Option Holder at a price (the "Substitute Option Repurchase Price") equal to (x)
the amount by which (i) the Highest Closing Price (as hereinafter defined)
exceeds (ii) the exercise price of the Substitute Option, multiplied by the
number of shares of Substitute Common Stock for which the Substitute Option may
then be exercised plus (y) Grantee's Out-of-Pocket Expenses (to the extent said
Expenses exceed $600,000 and were not previously reimbursed), and at the request
of the owner (the "Substitute Share Owner") of shares of Substitute Common Stock
(the "Substitute Shares"), the Substitute Option Issuer shall repurchase the
Substitute Shares at a price (the "Substitute Share Repurchase Price") equal to
(x) the Highest Closing Price multiplied by the number of Substitute Shares so
designated plus (y) Grantee's Out-of-Pocket Expenses (to the extent said
expenses exceed $600,000 and were not previously reimbursed).  The term "Highest
Closing Price" shall mean the highest closing price for shares of Substitute
Common Stock within the six-month period immediately preceding the date the
Substitute Option Holder gives notice of the required repurchase of the
Substitute Option or the Substitute Share Owner gives notice of the required
repurchase of the Substitute Shares, as applicable.

     (b)     The Substitute Option Holder and the Substitute Share Owner, as the
case may be, may exercise its respective right to require the Substitute Option
Issuer to repurchase the Substitute Option and the Substitute Shares pursuant to
this Section 9 by surrendering for such purpose to the Substitute Option Issuer,
at its principal office, the agreement for such Substitute Option (or, in the
absence of such an agreement, a copy of this Agreement) and certificates for
Substitute Shares accompanied by a written notice or notices stating that the
Substitute Option Holder or the Substitute Share Owner, as the case may be,
elects to require the Substitute Option Issuer to repurchase the Substitute
Option and/or the Substitute Shares in accordance with the provision of this
Section 9. As promptly as practicable, and in any event within five business
days after the surrender of the Substitute Option and/or certificates
representing Substitute Shares and the receipt of such notice or notices
relating thereto, the Substitute Option Issuer shall deliver or cause to be
delivered to the Substitute Option Holder the Substitute Option Repurchase Price
and/or to the Substitute Share Owner the 

                                      -8-
<PAGE>
 
Substitute Share Repurchase Price therefor or the portion thereof which the
Substitute Option Issuer is not then prohibited under applicable law and
regulation from so delivering.

     (c)     To the extent that the Substitute Option Issuer is prohibited under
applicable law or regulation, or as a consequence of administrative policy, from
repurchasing the Substitute Option and/or the Substitute Shares in part or in
full, the Substitute Option Issuer shall immediately so notify the Substitute
Option Holder and/or the Substitute Share Owner and thereafter deliver or cause
to be delivered, from time to time, to the Substitute Option Holder and/or the
Substitute Share Owner, as appropriate, the portion of the Substitute Share
Repurchase Price, respectively, which it is no longer prohibited from
delivering, within five business days after the date on which the Substitute
Option Issuer is no longer so prohibited; provided, however, that if the
                                          -----------------             
Substitute Option Issuer is at any time after delivery of a notice of repurchase
pursuant to subsection (b) of this Section 9 prohibited under applicable law or
regulation, or as a consequence of administrative policy, from delivering to the
Substitute Option Holder and/or the Substitute Share Owner, as appropriate, the
Substitute Option Repurchase Price and the Substitute Share Repurchase Price,
respectively, in full (and the Substitute Option Issuer shall use its best
efforts to receive all required regulatory and legal approvals as promptly as
practicable in order to accomplish such repurchase), the Substitute Option
Holder or Substitute Share Owner may revoke its notice of repurchase of the
Substitute Option or the Substitute Shares either in whole or to the extent of
the prohibition, whereupon, in the latter case, the Substitute Option Issuer
shall promptly (i) deliver to the Substitute Option Holder or Substitute Share
Owner, as appropriate, that portion of the Substitute Option Repurchase Price or
the Substitute Share Repurchase Price that the Substitute Option Issuer is not
prohibited from delivering; and (ii) deliver, as appropriate, either (A) to the
Substitute Option Holder, a new Substitute Option evidencing the right of the
Substitute Option Holder to purchase that number of shares of the Substitute
Common Stock obtained by multiplying the number of shares of the Substitute
Common Stock for which the surrendered Substitute Option was exercisable at the
time of delivery of the notice of repurchase by a fraction, the numerator of
which is the Substitute Option Repurchase Price less the portion thereof
theretofore delivered to the Substitute Option Holder and the denominator of
which is the Substitute Option Repurchase Price, or (B) to the Substitute Share
Owner, a certificate for the Substitute Option Shares it is then so prohibited
from repurchasing.  If an Exercise Termination Event shall have occurred prior
to the date of the notice by the Substitute Option Issuer described in the first
sentence of this subsection (c), or shall be scheduled to occur at any time
before the expiration of a period ending on the thirtieth day after such date,
the Substitute Option Holder shall nevertheless have the right to exercise the
Substitute Option until the expiration of such 30 day period.

     10.     The 30-day period for exercise of certain rights under Sections 2,
6, 7, 9 and 13 shall be extended: (i) to the extent necessary to obtain all
regulatory approvals for the exercise of such rights, and for the expiration of
all statutory waiting periods; and (ii) to the extent necessary to avoid
liability under Section 16(b) of the Exchange Act by reason of such exercise.

     11.     Issuer hereby represents and warrants to Grantee as follows:

     (a)     Issuer has full corporate power and authority to execute and
deliver this Agreement and to consummate the transactions contemplated hereby.
The execution and delivery of this Agreement and the consummation of the
transactions contemplated hereby have been duly and validly authorized by the
Board of Directors of Issuer and no other corporate proceedings on the part of
Issuer are necessary to authorize this Agreement or to consummate the
transactions so contemplated. This Agreement has been duly and validly executed
and delivered by Issuer. This Agreement is the valid and legally binding
obligation of Issuer, enforceable against Issuer in accordance with its terms.

     (b)     Issuer has taken all necessary corporate action to authorize and
reserve and to permit it to issue, and at all times from the date hereof through
the termination of this Agreement in accordance with its terms will have
reserved for issuance upon the exercise of the Option, that number of shares of
Common Stock equal to the maximum number of shares of Common Stock at any time
and from time to time issuable hereunder, and all such shares, upon issuance
pursuant hereto, will be duly authorized, validly issued, fully 

                                      -9-
<PAGE>
 
paid, nonassessable, and will be delivered free and clear of all claims, liens,
encumbrance and security interests and not subject to any preemptive rights.

     (c)     Except as disclosed pursuant to the Reorganization Agreement, the
execution and delivery of this Agreement does not, and the consummation of the
transactions contemplated hereby will not, conflict with, or result in any
violation pursuant to any provisions of the Articles of Incorporation or by-laws
of Issuer or any Subsidiary of Issuer or, subject to obtaining any approvals or
consents contemplated hereby, result in any violation of any loan or credit
agreement, note, mortgage, indenture, lease, plan or other agreement,
obligation, instrument, permit, concession, franchise, license, judgment, order,
decree, statute, law, ordinance, rule or regulation applicable to Issuer or any
Subsidiary of Issuer or their respective properties or assets which violation
would have a material adverse effect on Issuer.

     12.     Grantee hereby represents and warrants that it is acquiring the
Option for its own account and not with a view to or for sale in connection with
any distribution.

     13.     Neither of the parties hereto may assign any of its rights or
obligations under this Option Agreement or the Option created hereunder to any
other person, without the express written consent of the other party, except
that in the event a Subsequent Triggering Event shall have occurred prior to an
Exercise Termination Event, Grantee, subject to the express provisions hereof,
may assign in whole or in part its rights and obligations hereunder within 30
days following such Subsequent Triggering Event (or such later period as
provided in Section 10); provided, however, that until the date 30 days
                         -----------------                             
following the date on which the Superintendent or the FDIC approve an
application by Grantee under the BHCA or any change in bank control laws to
acquire the shares of Common Stock subject to the Option, Grantee may not assign
its rights under the Option except in (i) a widely dispersed public
distribution, (ii) a private placement in which no one party acquires the right
to purchase in excess of 2% of the voting shares of Issuer, (iii) an assignment
to a single party (e.g., a broker or investment banker) for the purpose of
conducting a widely dispersed public distribution on Grantee's behalf, or (iv)
any other manner approved by the Superintendent or the FDIC.

     14.     Each of Grantee and Issuer will use its best efforts to make all
filings with, and to obtain consents of, all third parties and governmental
authorities necessary to the consummation of the transactions contemplated by
this Agreement, including without limitation making application to list the
shares of Common Stock issuable hereunder on Nasdaq upon official notice of
issuance and applying to the Superintendent or the FDIC under the BHCA or any
change in bank control laws for approval to acquire the shares issuable
hereunder, but Grantee shall not be obligated to apply to state banking
authorities for approval to acquire the shares of Common Stock issuable
hereunder until such time, if ever, as it deems appropriate to do so.

     15.     Notwithstanding anything to the contrary herein, in the event that
the Holder or Owner or any Related Person thereof is a person making without the
prior written consent of Issuer an offer or proposal to engage in an Acquisition
Transaction (other than the transaction contemplated by the Reorganization
Agreement), then (i) in the case of a Holder or any Related Person thereof, the
Option held by it shall immediately terminate and be of no further force or
effect, and (ii) in the case of an Owner or any Related Person thereof, the
Option Shares held by it shall be immediately repurchasable by Issuer at the
Option Price. A Related Person of a Holder or Owner means any Affiliate (as
defined in Rule 12b-2 of the rules and regulations under the Exchange Act) of
the Holder or Owner and any person that is the beneficial owner of 20% or more
of the voting power of the Holder or Owner, as the case may be.

     16.     The parties hereto acknowledge that damages would be an inadequate
remedy for a breach of this Agreement by either party hereto and that the
obligations of the parties hereto shall be enforceable by either party hereto
through injunctive or other equitable relief.

     17.     If any term, provision, covenant or restriction contained in this
Agreement is held by a court or a federal or state regulatory agency of
competent jurisdiction to be invalid, void or unenforceable, the remainder of
the terms, provisions and covenants and restrictions contained in 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 

                                      -10-
<PAGE>
 
regulatory agency determines that the Holder or Substitute Option Holder is not
permitted to acquire, or Issuer or Substitute Option Issuer is not permitted to
repurchase pursuant to Section 7 or Section 9, as the case may be, the full
number of shares of Common Stock provided in Section 1(a) hereof (as adjusted
pursuant to Section 1(b) or Section 5 hereof), it is the express intention of
Issuer to allow the Holder to acquire or to require Issuer to repurchase such
lesser number of shares as may be permissible, without any amendment or
modification hereof.

     18.     All notices, requests, claims, demands and other communications
hereunder shall be deemed to have been duly given when delivered in person, by
cable, telegram, telecopy or telex, or by registered or certified mail (postage
prepaid, return receipt requested) at the respective addresses of the parties
set forth in the Reorganization Agreement.

     19.     This Agreement shall be governed by and construed in accordance
with the laws of the State of California, regardless of the laws that might
otherwise govern under applicable principles of conflicts of laws thereof.

     20.     This Agreement may be executed in two or more counterparts, each of
which shall be deemed to be an original, but all of which shall constitute one
and the same agreement.

     21.     Except as otherwise expressly provided herein or in the
Reorganization Agreement, 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.

     22.     Except as otherwise expressly provided herein or in the
Reorganization Agreement, this Agreement contains the entire agreement between
the parties with respect to the transactions contemplated hereunder and
supersedes all prior arrangements or understandings with respect thereof,
written or oral. The terms and conditions of this Agreement shall inure to the
benefit of and be binding upon the parties hereto and their respective
successors and permitted assigns. Nothing in this Agreement, expressed or
implied, is intended to confer upon any party, other than the parties hereto,
and their respective successors except as assigns, any rights, remedies,
obligations or liabilities under or by reason of this Agreement, except as
expressly provided herein. Any provision of this Agreement may be waived at any
time 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.

     23.     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.

     24.     Capitalized terms used in this Agreement and not defined herein
shall have the meanings assigned thereto in the Reorganization Agreement.

                                      -11-
<PAGE>
 
         IN WITNESS WHEREOF, Grantee and Issuer have caused this Agreement to be
signed by their respective officers thereunto duly authorized, all as of the
date first written above.

                                       WESTAMERICA BANCORPORATION



                                       By: /s/David L. Payne
                                           -------------------------------------

                                       Name:  David L. Payne
                                              ---------------------------------

Attest: /s/M. Kitty Jones              Title: Chairman, President & CEO
        ----------------------------          ----------------------------------

Name:   M. Kitty Jones
        --------------------------- 

Title:  Secretary
        -----------------------


                                       CAPITOLBANK SACRAMENTO



                                       By: /s/Thayer T. Prentice
                                           -------------------------------------

                                       Name:  Thayer T. Prentice
                                              ---------------------------------

Attest: /s/Lawrence D. McGovern        Title: Vice-Chairman & CEO
        ----------------------------          ----------------------------------

Name:   Lawrence D. McGovern
        ----------------------

Title: Senior Vice President/CFO/Secretary
       -----------------------------------

                                      -12-
<PAGE>
 
                                                                         ANNEX E


                       CALIFORNIA GENERAL CORPORATION LAW


(S) 1300.  REORGANIZATION OR SHORT-FORM MERGER; DISSENTING SHARES; CORPORATION
PURCHASE AT FAIR MARKET VALUE; DEFINITIONS

          (a) If the approval of the outstanding shares (Section 152) of a
corporation is required for a reorganization under subdivisions (a) and (b) or
subdivision (e) or (f) of Section 1201, each shareholder of the corporation
entitled to vote on the transaction and each shareholder of a subsidiary
corporation in a short-form merger may, by complying with this chapter, require
the corporation in which the shareholder holds shares to purchase for cash at
their fair market value the shares owned by the shareholder which are dissenting
shares as defined in subdivision (b).  The fair market value shall be determined
as of the day before the first announcement of the terms of the proposed
reorganization or short-form merger, excluding any appreciation or depreciation
in consequence of the proposed action, but adjusted for any stock split, reverse
stock split, or share dividend which becomes effective thereafter.

          (b) As used in this chapter, "dissenting shares" means shares which
come within all of the following descriptions:

          (1) Which were not immediately prior to the reorganization or short-
form merger either (A) listed on any national securities exchange certified by
the Commissioner of Corporations under subdivision (o) of Section 25100 or (B)
listed on the list of OTC margin stocks issued by the Board of Governors of the
Federal Reserve System, and the notice of meeting of shareholders to act upon
the reorganization summarizes this section and Sections 1301, 1302, 1303 and
1304; provided, however, that this provision does not apply to any shares with
respect to which there exists any restriction on transfer imposed by the
corporation or by any law or regulation; and provided, further, that this
provision does not apply to any class of shares described in subparagraph (A) or
(B) if demands for payment are filed with respect to 5 percent or more of the
outstanding shares of that class.

          (2) Which were outstanding on the date for the determination of
shareholders entitled to vote on the reorganization and (A) were not voted in
favor of the reorganization or, (B) if described in subparagraph (A) or (B) of
paragraph (1) (without regard to the provisos in that paragraph), were voted
against the reorganization, or which were held of record on the effective date
of a short-form merger; provided, however, that subparagraph (A) rather than
subparagraph (B) of this paragraph applies in any case where the approval
required by Section 1201 is sought by written consent rather than at a meeting.

          (3) Which the dissenting shareholder has determined that the
corporation purchase at their fair market value, in accordance with Section
1301.

          (4) Which the dissenting shareholder has submitted for endorsement, in
accordance with Section 1302.

          (c) As used in this chapter, "dissenting shareholder" means the
recordholder of dissenting shares and includes a transferee of record.

(S) 1301.  NOTICE TO HOLDERS OF DISSENTING SHARES IN REORGANIZATIONS; DEMAND FOR
PURCHASE; TIME; CONTENTS.

          (a) If, in the case of a reorganization, any shareholders of a
corporation have a right under Section 1300, subject to compliance with
paragraphs (3) and (4) of subdivision (b) thereof, to require the corporation to
purchase their shares for cash, such corporation shall mail to each such
shareholder a notice of the approval of the reorganization by its outstanding
shares (Section 152) within 10 days after the date of such approval, accompanied
by a copy of Sections

                                      -1-
<PAGE>
 
1300, 1302, 1303, 1304 and this section, a statement of the price determined by
the corporation to represent the fair market value of the dissenting shares, and
a brief description of the procedure to be followed if the shareholder desires
to exercise the shareholder's right under such sections.  The statement of price
constitutes an offer by the corporation to purchase at the price stated any
dissenting shares as defined in subdivision (b) of Section 1300, unless they
lose their status as dissenting shares under Section 1309.

          (b) Any shareholder who has a right to require the corporation to
purchase the shareholder's shares for cash under Section 1300, subject to
compliance with paragraphs (3) and (4) of subdivision (b) thereof, and who
desires the corporation to purchase such shares shall make written demand upon
the corporation for the purchase of such shares and payment to the shareholder
in cash of their fair market value.  The demand is not effective for any purpose
unless it is received by the corporation or any transfer agent thereof (1) in
the case of shares described in clause [(A)] or [(B)] of paragraph (1) of
subdivision (b) of Section 1300 (without regard to the provisos in that
paragraph), not later than the date of the shareholders' meeting to vote upon
the reorganization, or (2) in any other case within 30 days after the date on
which the notice of the approval by the outstanding shares pursuant to
subdivision (a) or the notice pursuant to subdivision (i) of Section 1110 was
mailed to the shareholder.

          (c) The demand shall state the number and class of the shares held of
record by the shareholder which the shareholder demands that the corporation
purchase and shall contain a statement of what such shareholder claims to be the
fair market value of those shares as of the day before the announcement of the
proposed reorganization or short-form merger.  The statement of fair market
value constitutes an offer by the shareholder to sell the shares at such price.

(S) 1302.  SUBMISSION OF SHARE CERTIFICATES FOR ENDORSEMENT; UNCERTIFICATED
SECURITIES

          Within 30 days after the date on which notice of the approval by the
outstanding shares or the notice pursuant to subdivision (i) of Section 1110 was
mailed to the shareholder, the shareholder shall submit to the corporation at
its principal office or at the office of any transfer agent thereof, (a) if the
shares are certificated securities, the shareholder's certificates representing
any shares which the shareholder demands that the corporation purchase, to be
stamped or endorsed with a statement that the shares are dissenting shares or to
be exchanged for certificates of appropriate denomination so stamped or endorsed
or (b) if the shares are uncertificated securities, written notice of the number
of shares which the shareholder demands that the corporation purchase.  Upon
subsequent transfers of the dissenting shares on the books of the corporation,
the new certificates, initial transaction statement, and other written
statements issued therefor shall bear a like statement, together with the name
of the original dissenting holder of the shares.

(S) 1303.  PAYMENT OF AGREED PRICE WITH INTEREST; AGREEMENT FIXING FAIR MARKET
VALUE; FILING; TIME OF PAYMENT

          (a) If the corporation and the shareholder agree that the shares are
dissenting shares and agree upon the price of the shares, the dissenting
shareholder is entitled to the agreed price with interest thereon at the legal
rate on judgments from the date of the agreement.  Any agreements fixing the
fair market value of any dissenting shares as between the corporation and the
holders thereof shall be filed with the secretary of the corporation.

          (b) Subject to the provisions of Section 1306, payment of the fair
market value of dissenting shares shall be made within 30 days after the amount
thereof has been agreed or within 30 days after any statutory or contractual
conditions to the reorganization are satisfied, whichever is later, and in the
case of certificated securities, subject to surrender of the certificates
therefor, unless provided otherwise by agreement.

                                      -2-
<PAGE>
 
(S) 1304.  ACTION TO DETERMINE WHETHER SHARES ARE DISSENTING SHARES OR FAIR
MARKET VALUE; LIMITATION; JOINDER; CONSOLIDATION; DETERMINATION OF ISSUES;
APPOINTMENT OF APPRAISERS

          (a) If the corporation denies that the shares are dissenting shares,
or the corporation and the shareholder fail to agree upon the fair market value
of the shares, then the shareholder demanding purchase of such shares as
dissenting shares or any interested corporation, within six months after the
date on which notice of the approval by the outstanding shares (Section 152) or
notice pursuant to subdivision (i) of Section 1110 was mailed to the
shareholder, but not thereafter, may file a complaint in the superior court of
the proper county praying the court to determine whether the shares are
dissenting shares or the fair market value of the dissenting shares or both or
may intervene in any action pending on such a complaint.

          (b) Two or more dissenting shareholders may join as plaintiffs or be
joined as defendants in any such action and two or more such actions may be
consolidated.

          (c) On the trial of the action, the court shall determine the issues.
If the status of the shares as dissenting shares is in issue, the court shall
first determine that issue.  If the fair market value of the dissenting shares
is in issue, the court shall determine, or shall appoint one or more impartial
appraisers to determine, the fair market value of the shares.

(S) 1305.  REPORT OF APPRAISERS; CONFIRMATION; DETERMINATION BY COURT; JUDGMENT;
PAYMENT; APPEAL; COSTS

          (a) If the court appoints an appraiser or appraisers, they shall
proceed forthwith to determine the fair market value per share.  Within the time
fixed by the court, the appraisers, or a majority of them, shall make and file a
report in the office of the clerk of the court.  Thereupon, on the motion of any
party, the report shall be submitted to the court and considered on such
evidence as the court considers relevant.  If the court finds the report
reasonable, the court may confirm it.

          (b) If a majority of the appraisers appointed fail to make and file a
report within 10 days from the date of their appointment or within such further
time as may be allowed by the court or the report is not confirmed by the court,
the court shall determine the fair market value of the dissenting shares.

          (c) Subject to the provisions of Section 1306, judgment shall be
rendered against the corporation for payment of an amount equal to the fair
market value of each dissenting share multiplied by the number of dissenting
shares which any dissenting shareholder who is a party, or who has intervened,
is entitled to require the corporation to purchase, with interest thereon at the
legal rate from the date on which judgment was entered.

          (d) Any such judgment shall be payable forthwith with respect to
uncertificated securities and, with respect to certificated securities, only
upon the endorsement and delivery to the corporation of the certificates for the
shares described in the judgment.  Any party may appeal from the judgment.

          (e) The costs of the action, including reasonable compensation to the
appraisers to be fixed by the court, shall be assessed or apportioned as the
court consideres equitable, but, if the appraisal exceeds the price offered by
the corporation, the corporation shall pay the costs (including in the
discretion of the court attorneys' fees, fees of expert witnesses and interest
at the legal rate on judgments from the date of compliance with Sections 1300,
1301 and 1302 if the value awarded by the court for the shares is more than 125
percent of the price offered by the corporation under subdivision (a) of Section
1301).

(S) 1306.  PREVENTION OF IMMEDIATE PAYMENT; STATUS AS CREDITORS; INTEREST

          To the extent that the provisions of Chapter 5 prevent the payment to
any holders of dissenting shares of their fair market value, they shall become
creditors of the corporation for

                                      -3-
<PAGE>
 
the amount thereof together with interest at the legal rate on judgments until
the date of payment, but subordinate to all other creditors in any liquidation
proceeding, such debt to be payable when permissible under the provisions of
Chapter 5.

(S) 1307.  DIVIDENDS ON DISSENTING SHARES

          Cash dividends declared and paid by the corporation upon the
dissenting shares after the date of approval of the reorganization by the
outstanding shares (Section 152) and prior to payment for the shares by the
corporation shall be credited against the total amount to be paid by the
corporation therefor.

(S) 1308.  RIGHTS OF DISSENTING SHAREHOLDERS PENDING VALUATION; WITHDRAWAL OF
DEMAND FOR PAYMENT

          Except as expressly limited in this chapter, holders of dissenting
shares continue to have all the rights and privileges incident to their shares,
until the fair market value of their shares is agreed upon or determined.  A
dissenting shareholder may not withdraw a demand for payment unless the
corporation consents thereto.

(S) 1309.  TERMINATION OF DISSENTING SHARE AND SHAREHOLDER STATUS

          Dissenting shares lose their status as dissenting shares and the
holders thereof cease to be dissenting shareholders and cease to be entitled to
require the corporation to purchase their shares upon the happening of any of
the following:

          (a) The corporation abandons the reorganization.  Upon abandonment of
the reorganization, the corporation shall pay on demand to any dissenting
shareholder who has initiated proceedings in good faith under this chapter all
necessary expenses incurred in such proceedings and reasonable attorneys' fees.

          (b) The shares are transferred prior to their submission for
enforcement in accordance with Section 1302 or are surrendered for conversion
into shares of another class in accordance with the articles.

          (c) The dissenting shareholder and the corporation do not agree upon
the status of the shares as dissenting shares or upon the purchase price of the
shares, and neither files a complaint or intervenes in a pending action as
provided in Section 1304, within six months after the date on which notice of
the approval by the outstanding shares or notice pursuant to subdivision (i) of
Section 1110 was mailed to the shareholder.

          (d) The dissenting shareholder, with the consent of the corporation,
withdraws the shareholder's demand for purchase of the dissenting shares.

(S) 1310.  SUSPENSION OF RIGHT TO COMPENSATION OR VALUATION PROCEEDINGS;
LITIGATION OF SHAREHOLDERS' APPROVAL

          If litigation is instituted to test the sufficiency or regularity of
the votes of the shareholders in authorizing a reorganization, any proceedings
under Sections 1304 and 1305 shall be suspended until final determination of
such litigation.

(S) 1311.  EXEMPT SHARES

          This chapter, except Section 1312, does not apply to classes of shares
whose terms and provisions specifically set forth the amount to be paid in
respect to such shares in the event of a reorganization or merger.

                                      -4-
<PAGE>
 
(S) 1312.  RIGHT OF DISSENTING SHAREHOLDER TO ATTACK, SET ASIDE OR RESCIND
MERGER OR REORGANIZATION; RESTRAINING ORDER OR INJUNCTION; CONDITIONS

          (a) No shareholder of a corporation who has a right under this chapter
to demand payment of cash for the shares held by the shareholder shall have any
right at law or in equity to attack the validity of the reorganization or short-
form merger, or to have the reorganization or short-form merger set aside or
rescinded, except in an action to test whether the number of shares required to
authorize or approve the reorganization have been legally voted in favor
thereof; but any holder of shares of a class whose terms and provisions
specifically set forth the amount to be paid in respect to them in the event of
a reorganization or short-form merger is entitled to payment in accordance with
those terms and provisions or, if the principal terms of the reorganization are
approved pursuant to subdivision (b) of Section 1202, is entitled to payment in
accordance with the terms and provisions of the approved reorganization.

          (b) If one of the parties to a reorganization or short-form merger is
directly or indirectly controlled by, or under common control with, another
party to the reorganization or short-form merger, subdivision (a) shall not
apply to any shareholder of such party who has not demanded payment of cash for
such shareholder's shares pursuant to this chapter; but if the shareholder
institutes any action to attack the validity of the reorganization or short-form
merger or to have the reorganization or short-form merger set aside or
rescinded, the shareholder shall not thereafter have any right to demand payment
of cash for the shareholder's shares pursuant to this chapter.  The court in any
action attacking the validity of the reorganization or short-form merger or to
have the reorganization or short-form merger set aside or rescinded shall not
restrain or enjoin the consummation of the transaction except upon 10 days'
prior notice to the corporation and upon a determination by the court that
clearly no other remedy will adequately protect the complaining shareholder or
the class of shareholders of which such shareholder is a member.

          (c) If one of the parties to a reorganization or short-form merger is
directly or indirectly controlled by, or under common control with, another
party to the reorganization or short-form merger, in any action to attack the
validity of the reorganization or short-form merger or to have the
reorganization or short-form merger set aside or rescinded, (1) a party to a
reorganization or short-form merger which controls another party to the
reorganization or short-form merger shall have the burden of proving that the
transaction is just and reasonable as to the shareholders of the controlled
party, and (2) a person who controls two or more parties to a reorganization
shall have the burden of proving that the transaction is just and reasonable as
to the shareholders of any party so controlled.

                                      -5-
<PAGE>
 
                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

      Item 20. Indemnification of Directors and Officers.

           Section 317 of the California Corporations Code authorizes a court to
      award, or a corporation's Board of Directors to grant, indemnity to
      directors, officers, employees and other agents of the corporation
      ("Agents") in terms sufficiently broad to permit such indemnification
      under certain circumstances for liabilities (including reimbursement for
      expenses incurred) arising under the Securities Act of 1933, as amended.

           Article VII of the Registrant's Restated Articles of Incorporation,
      as amended, authorizes the Registrant to indemnify its Agents, through
      bylaw provisions, agreements, votes of shareholders or disinterested
      directors or otherwise, in excess of the indemnification otherwise
      permitted by Section 317 of the California Corporations Code, subject to
      the applicable limits set forth in Section 204 of the California
      Corporations Code with respect to actions for breach of duty to the
      Registrant and its shareholders.  Article VII also authorizes the
      Registrant to provide insurance for Agents provided that, in cases where
      the Registrant owns all or a portion of the shares of the company issuing
      the insurance policy, such company and/or the policy must meet certain
      conditions set forth in Section 317.  Article V of the Registrant's Bylaws
      provides for mandatory indemnification of each director of the Registrant
      except as prohibited by law.

           The Registrant maintains a directors' and officers' liability
      insurance policy that indemnifies the Registrant's directors and officers
      against certain losses in connection with claims made against them for
      certain wrongful acts.  In addition, the Registrant has entered into
      separate indemnification agreements with its directors and officers that
      require the Registrant, among other things, (i) to maintain directors' and
      officers' insurance in reasonable amounts in favor of such individuals,
      and (ii) to indemnify them against certain liabilities that may arise by
      reason of their status or service as Agents of the Registrant to the
      fullest extent permitted by California law.

      Item 21.  Exhibits and Financial Statement Schedules.

           Note:  Exhibits marked with a + are incorporated by reference to the
      Registrant's Registration Statement on Form S-4 (No. 33-52146).  Each such
      Exhibit had the number in parentheses immediately following the
      description of the Exhibit herein.

           (A)  Exhibits.

          Exhibit
          Number
          -------

           2.1     Agreement and Plan of Reorganization among the Registrant and
                   CapitolBank, dated as of November 17, 1994 (included as Annex
                   A to the Proxy Statement/Prospectus (without certain
                   exhibits)).

           4.1+    Specimen of the Registrant's Common Stock certificate with
                   Rights Legend.  (4.1)

           4.2+    Amended and Restated Rights Agreement, dated as of September
                   28, 1989, between the Registrant and Bank of America, NT&SA,
                   as amended by the Appointment and Acceptance Agreement, dated
                   as of May 25, 1992, between the Registrant and Chemical Trust
                   Company of California.  (4.2)

           4.3     The Registrant and certain of its consolidated subsidiaries
                   have outstanding certain long-term debt.  None of such debt
                   exceeds 10% of the total assets of the Registrant and its
                   consolidated subsidiaries; therefore, copies of the
                   constituent instruments defining the rights of the holders of
                   such debt are not included as exhibits to this Registration
                   Statement. The Registrant agrees to furnish copies of such
                   instruments to the SEC upon request.

           5.1     Opinion of Pillsbury Madison & Sutro.

                                      II-1
<PAGE>
 
        Exhibit
        Number
        -------

         10.1    Stock Option Agreement, dated as of November 17, 1994,
                 between the Registrant and CapitolBank (included as Annex D
                 to the Proxy Statement/Prospectus).

         23.1    Consent of KPMG Peat Marwick LLP (Westamerica) (see Page II-6).

         23.2    Consent of KPMG Peat Marwick LLP (CapitolBank) 
                 (see Page II-7).

         23.3    Consent of Arthur Andersen LLP (see Page II-8).

         23.4    Consent of Pillsbury Madison & Sutro (included in Exhibit
                 5.1).

         23.5    Consent of Hoefer & Arnett Incorporated

         23.6    Consent of Smith & Crowley Inc.

         23.7    Consent of Grant Thornton

         99.1    Form of proxy to be used in soliciting shareholders of
                 CapitolBank for its Special Meeting.

         (B)  Financial Statement Schedules:  Not applicable.

    Item 22.  Undertakings.

         (1)  The undersigned Registrant hereby undertakes:  (a) 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; (b) 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 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;
    (c) 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.

         (2)  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.

         (3)  The undersigned Registrant hereby undertakes as follows:  that
    prior to any public reoffering of the securities registered hereunder
    through use of a prospectus which is a part of this registration
    statement, by any person or party who is deemed to be an underwriter
    within the meaning of Rule 145(c), the issuer undertakes that such
    reoffering prospectus will contain 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.

         (4)  The Registrant undertakes that every prospectus (i) that is
    filed pursuant to paragraph (3) immediately preceding, or (ii) that
    purports to meet the requirements of section 10(a)(3) of the Securities
    Act of 1933 and is used in connection with an offering of securities
    subject to Rule 415, will be filed as a part of an amendment to the
    registration statement and will not be used until such amendment is
    effective, and that, for purposes of determining any liability under the
    Securities Act of 1933, each such post-effective amendment shall be deemed
    to be a new registration statement relating to the securities offered
    therein, and the offering of such securities at that time shall be deemed
    to be the initial bona fide offering thereof.

                                      II-2
<PAGE>
 
           (5)  Insofar as indemnification for liabilities arising under the
      Securities Act of 1933 may be permitted to directors, officers and
      controlling persons of the Registrant pursuant to the foregoing
      provisions, or otherwise, the Registrant has been advised that in the
      opinion of the Securities and Exchange Commission such indemnification is
      against public policy as expressed in the Act and is, therefore,
      unenforceable.  In the event that a claim for indemnification against such
      liabilities (other than the payment by the Registrant of expenses incurred
      or paid by a director, officer or controlling person of the Registrant in
      the successful defense of any action, suit or proceeding) is asserted by
      such director, officer or controlling person in connection with the
      securities being registered, the Registrant will, unless in the opinion of
      its counsel the matter has been settled by controlling precedent, submit
      to a court of appropriate jurisdiction the question whether such
      indemnification by it is against public policy as expressed in the Act and
      will be governed by the final adjudication of such issue.

           (6)  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 of the registration statement through the date of
      responding to the request.

                (7)  The undersigned Registrant hereby undertakes to supply by
      means of a post-effective amendment all information concerning a
      transaction, and the company being acquired involved therein, that was not
      the subject of and included in the registration statement when it became
      effective.

                                      II-3
<PAGE>
 
                                   SIGNATURES

           Pursuant to the requirements of the Securities Act of 1933, the
      Registrant has duly caused this Registration Statement to be signed on its
      behalf by the undersigned, thereunto duly authorized, in the City of San
      Rafael, State of California, on the 21st day of December, 1994.

                                     WESTAMERICA BANCORPORATION



                                     By         /s/ David L. Payne
                                        -------------------------------------
                                                    David L. Payne
                                               Chairman, President and
                                               Chief Executive Officer


           Pursuant to the requirement of the Securities Act of 1933, this
      Registration Statement has been signed by the following persons in the
      capacities and on the dates indicated.

<TABLE>
<CAPTION>

          Signature                   Title                          Date
         -----------                  -----                          ----
<S>                               <C>                          <C> 


      /s/ Etta Allen              Director                     December 21, 1994
- --------------------------------
          Etta Allen



     /s/ James M. Barnes          Executive Vice President     December 21, 1994
- --------------------------------  and Chief Financial 
         James M. Barnes          Officer (Principal 
                                  Financial Officer)



   /s/ Louise E. Bartolini        Director                     December 21, 1994
- --------------------------------
       Louis E. Bartolini



 /s/ Charles I. Daniels, Jr.      Director                     December 21, 1994
- --------------------------------
     Charles I. Daniels, Jr.



       /s/ Don Emerson            Director                     December 21, 1994
- --------------------------------
           Don Emerson



   /s/ Dennis R. Hansen           Senior Vice President and    December 21, 1994
- --------------------------------  Controller (Principal 
       Dennis R. Hansen           Accounting Officer)
 



    /s/ Arthur C. Latno           Director                     December 21, 1994
- --------------------------------
        Arthur C. Latno



    /s/ Patrick D. Lynch          Director                     December 21, 1994
- --------------------------------
        Patrick D. Lynch

</TABLE> 

                                      II-4
<PAGE>
 
<TABLE>
<CAPTION>

          Signature                   Title                          Date
         -----------                  -----                          ----
<S>                               <C>                          <C> 

  /s/ Catherine Cope MacMillan    Director                     December 21, 1994
- --------------------------------
      Catherine Cope MacMillan



   /s/ James A. Maggetti          Director                     December 21, 1994
- --------------------------------
       James A. Maggetti



 /s/ Dwight H. Murray, Jr., M.D.  Director                     December 21, 1994
- --------------------------------
   Dwight H. Murray, Jr., M.D.



    /s/ Ronald A. Nelson          Director                     December 21, 1994
- --------------------------------
        Ronald A. Nelson



      /s/ Carl R. Otto            Director                     December 21, 1994
- --------------------------------
          Carl R. Otto
 


     /s/ David L. Payne           Chairman of the Board,       December 21, 1994
- --------------------------------  President and Chief 
         David L. Payne           Executive Officer
 



  /s/ Edward B. Sylvester         Director                     December 21, 1994
- --------------------------------
      Edward B. Sylvester

</TABLE> 

                                      II-5
<PAGE>
 
                        CONSENT OF INDEPENDENT AUDITORS


The Board of Directors
Westamerica Bancorporation:

We consent to incorporation by reference in the registration statement (relating
to securities of Westamerica Bancorporation issuable to holders of CapitolBank
Sacramento in the proposed merger of CapitolBank Sacramento with Westamerica
Bancorporation) on Form S-4 of Westamerica Bancorporation of our report dated
January 25, 1994 relating to the consolidated balance sheets of Westamerica
Bancorporation and subsidiaries as of December 31, 1993 and 1992, and the
related consolidated statements of income, changes in shareholders' equity, and
cash flows for each of the years in the three-year period ended December 31,
1993, which report appears in the December 31, 1993 annual report on Form 10-K
of Westamerica Bancorporation. In addition, we consent to the reference to our
firm under the heading "Experts" in the Joint Proxy Statement/Prospectus which
is included in the Registration Statement on Form S-4.

San Francisco, California
December 22, 1994
                                       /s/ KPMG Peat Marwick LLP


                                     II-6
<PAGE>
 
              [LETTERHEAD OF KPMG PEAT MARWICK LLP APPEARS HERE]





To the Board of Directors
of CapitolBank Sacramento:


We consent to the use of our report included herein and to the reference to our 
firm under the heading "Experts" in the prospectus.

                                 /s/ KPMG Peat Marwick LLP


Sacramento, California
December 21, 1994


                                     II-7
<PAGE>
 
                      [LETTERHEAD OF ARTHUR ANDERSEN LLP]




                   Consent of Independent Public Accountants


As independent public accountants, we hereby consent to the use of our report 
(and to all references to our Firm) included in or made a part of this 
registration statement.

                                /s/ Arthur Andersen LLP


Sacramento, California
December 15, 1994


                                     II-8
<PAGE>
 
                                 EXHIBIT INDEX

      Note:  Exhibits marked with a + are incorporated by reference to the
      Registrant's Registration Statement on Form S-4 (No. 33-52146).  Each such
      Exhibit had the number in parentheses immediately following the
      description of the Exhibit herein.

 
       Exhibit 
       Number    Document Description                                      Page
       -------   --------------------                                      ----

        2.1      Agreement and Plan of Reorganization among the
                 Registrant and CapitolBank, dated as of November 17,
                 1994 (included as Annex A to the Proxy
                 Statement/Prospectus (without certain exhibits)).

       4.1+      Specimen of the Registrant's Common Stock certificate
                 with Rights Legend.  (4.1)

       4.2+      Amended and Restated Rights Agreement, dated as of
                 September 28, 1989, between the Registrant and Bank of
                 America, NT&SA, as amended by the Appointment and
                 Acceptance Agreement, dated as of May 25, 1992, between
                 the Registrant and Chemical Trust Company of California.
                 (4.2)

        4.3      The Registrant and certain of its consolidated
                 subsidiaries have outstanding certain long-term debt.
                 None of such debt exceeds 10% of the total assets of the
                 Registrant and its consolidated subsidiaries; therefore,
                 copies of the constituent instruments defining the
                 rights of the holders of such debt are not included as
                 exhibits to this Registration Statement.  The Registrant
                 agrees to furnish copies of such instruments to the SEC
                 upon request.

        5.1      Opinion of Pillsbury Madison & Sutro.

       10.1      Stock Option Agreement, dated as of November 17, 1994,
                 between the Registrant and CapitolBank (included as
                 Annex D to the Proxy Statement/Prospectus).

       23.1      Consent of KPMG Peat Marwick LLP (Westamerica) (see Page II-6).

       23.2      Consent of KPMG Peat Marwick LLP (CapitolBank) (see Page II-7).

       23.3      Consent of Arthur Andersen LLP (see Page II-8).

       23.4      Consent of Pillsbury Madison & Sutro (included in
                 Exhibit 5.1).

       23.5      Consent of Hoefer & Arnett Incorporated

       23.6      Consent of Smith & Crowley Inc.

       23.7      Consent of Grant Thornton.

       99.1      Form of proxy to be used in soliciting shareholders of
                 CapitolBank for its Special Meeting.

                                      II-9

<PAGE>

                                                                     EXHIBIT 5.1
 
            [LETTERHEAD OF PILLSBURY MADISON & SUTRO APPEARS HERE]

                               December 21, 1994




Westamerica Bancorporation
1108 Fifth Avenue
San Rafael, California 94901

Ladies and Gentlemen:

     With reference to the Registration Statement on Form S-4 filed by 
Westamerica Bancorporation, a California corporation ("WABC"), with the 
Securities and Exchange Commission in connection with the registration under the
Securities Act of 1933, as amended, of 406,828 shares of WABC Common Stock, no 
par value (the "Shares"), to be issued in connection with the merger 
contemplated by the Agreement and Plan of Reorganization dated as of 
November 17, 1994 (the "Agreement") by and between WABC and CapitolBank
Sacramento, a California state chartered nonmember bank ("CapitolBank"), and
related Agreement of Merger among WABC, CapitolBank and Westamerica Merger
Subsidiary, a wholly owned subsidiary of WABC (the "Merger Agreement," and
collectively with the Agreement, the "Agreements") which Agreements are
described therein and filed as an exhibit thereto:

     We are of the opinion that the Shares have been duly authorized and, when 
issued in accordance with the Agreements, will be legally issued, fully paid and
nonassessable.

     We hereby consent to the filing of this opinion as Exhibit 5.1 to the 
Registration Statement and to the use of our name under the caption "Legal 
Matters" in the Registration Statement and in the Proxy Statement/Prospectus 
included therein.

                               Very truly yours,


                               /s/ PILLSBURY MADISON & SUTRO

<PAGE>
 
                                                                    EXHIBIT 23.5





                   CONSENT OF HOEFER & ARNETT, INCORPORATED

We consent to the inclusion in the Westamerica Bancorporation and CapitolBank 
Sacramento Registration Statement/Proxy Statement on Form S-4, and any 
amendments thereto, of our Fairness Opinion, and reference to our names and the 
statements with respect to us, as appearing under the heading "Opinions of 
CapitolBank's Financial Advisors."


San Francisco, California
December 21, 1994

                                 Hoefer & Arnett, Incorporated

                                        By: /s/ Hoefer & Arnett, Incorporated
                                           ----------------------------------

<PAGE>

                                                                    EXHIBIT 23.6

                     [LETTERHEAD OF SMITH & CROWLEY INC.]


                        CONSENT OF SMITH & CROWLEY INC.

We consent to the inclusion in the Westamerica Bancorporation and CapitolBank
Sacramento Registration Statement/Proxy Statement on Form S-4, and any
amendments thereto, of our Fairness Opinion, and reference to our names and the
statements with respect to us, as appearing under the heading "Opinions of
CapitolBank's Financial Advisors."

San Francisco, California
December 21, 1994

                                       Smith & Crowley Inc.

                                       By:  /s/ Donald K. Crowley
                                          ------------------------------


<PAGE>
 
                                                                    EXHIBIT 23.7




              CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS
              ---------------------------------------------------


We consent to the incorporation by reference in this Registration Statement on 
Form S-4, our report dated January 14, 1994, appearing in the Westamerica/PV 
Financial Registration Statement on Form S-4 (File No. 33-55417) filed on 
October 5, 1994 with the Securities and Exchange Commission pursuant to the 
Securities Act of 1933.

                                           /s/ Grant Thornton

Stockton, California
December 21, 1994

<PAGE>
 
                                                                    EXHIBIT 99.1

                            CAPITOLBANK SACRAMENTO
          THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

     The undersigned hereby appoints Thayer T. Prentice, Vice Chairman of the 
Board & Chief Executive Officer, and Bernard Rao, Senior Vice President & Chief 
Administrative Officer, and each of them, with full power of substitution, as 
proxies of the undersigned, to attend the Special Meeting of Shareholders of 
CapitolBank Sacramento ("CapitolBank") to be held at 300 Capitol Mall, 
Sacramento, California, on Thursday, February 23, 1994 at 5:00 p.m. and any 
adjournment or postponement thereof, and to vote the number of shares the 
undersigned would be entitled to vote if personally present upon the following 
items and to vote according to their discretion on any other matter which may 
properly be presented for action at said meeting or any adjournment or 
postponement thereof:

     1. TO ADOPT AND APPROVE THE AGREEMENT AND PLAN OF REORGANIZATION DATED AS
        OF NOVEMBER 17, 1994, BY AND BETWEEN WESTAMERICA BANCORPORATION
        ("WESTAMERICA") AND CAPITOLBANK, AN AGREEMENT OF MERGER AMONG
        WESTAMERICA, CAPITOLBANK AND WESTAMERICA MERGER SUBSIDIARY, A WHOLLY-
        OWNED SUBSIDIARY OF WESTAMERICA ("MERGER SUB"), THE MERGER OF MERGER SUB
        WITH AND INTO CAPITOLBANK AND THE TRANSACTIONS CONTEMPLATED THEREBY.

           [ ] FOR               [ ] AGAINST          [ ] ABSTAIN

               (To be completed and signed on the reverse side)



<PAGE>
 
                          (Continued from other side)

     THIS PROXY WILL BE VOTED AS SPECIFIED, OR IF NO CHOICE IS SPECIFIED, THIS 
PROXY WILL BE VOTED "FOR" THE PROPOSAL SET FORTH. Please sign exactly as name 
appears. When shares are held by joint tenants, both should sign. When signing 
as attorney, executor, administrator, trustee or guardian, please give full 
title as such. If a corporation, please sign in full corporate name by president
or other authorized officer. If a partnership, please sign in a partnership name
by authorized person.

                                Dated:_____________________,1994

                                Signature______________________________________

                                Signature, if held jointly_____________________

     SHAREHOLDERS ARE URGED TO MARK, DATE, SIGN AND RETURN THIS PROXY IN THE 
ENVELOPE PROVIDED, WHICH REQUIRES NO POSTAGE IF MAILED IN THE UNITED STATES.


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