CVB FINANCIAL CORP
8-K, 1999-05-21
STATE COMMERCIAL BANKS
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<PAGE>   1

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                    FORM 8-K


                             CURRENT REPORT PURSUANT
                          TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

         DATE OF REPORT (DATE OF EARLIEST EVENT REPORTED): MAY 18, 1999


                               CVB FINANCIAL CORP.
             (Exact name of registrant as specified in its charter)



                 CALIFORNIA                               95-3629339
     (State or other jurisdiction of                   (I.R.S. employer
      incorporation or organization)                 identification number)


                         COMMISSION FILE NUMBER: 1-10394


                             701 NORTH HAVEN AVENUE
                            ONTARIO, CALIFORNIA 91764
              (Address of principal executive offices and zip code)


       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (909) 980-4030


                                 NOT APPLICABLE
          (Former name or former address, if changed since last report)



<PAGE>   2


ITEM 1. CHANGES IN CONTROL OF REGISTRANT

               NOT APPLICABLE

ITEM 2. ACQUISITION OR DISPOSITION OF ASSETS

               NOT APPLICABLE

ITEM 3  BANKRUPTCY OR RECEIVERSHIP

               NOT APPLICABLE

ITEM 4. CHANGES IN REGISTRANT'S CERTIFYING ACCOUNTANT

               NOT APPLICABLE


ITEM 5. OTHER EVENTS

               On May 18, 1999, CVB Financial Corp. and Orange National Bancorp
entered into an Agreement and Plan of Reorganization providing for the merger of
Orange National Bancorp into CVB Financial Corp. The merger will be immediately
followed by the merger of Orange National Bank into Citizens Business Bank, a
subsidiary of CVB Financial Corp. The merger is subject to, among other
conditions,

                      -- receipt of regulatory approvals;

                      -- receipt of all necessary third party consents; and

                      -- approval, as necessary, of the shareholders of Orange
                         National Bancorp and CVB Financial Corp.


               In the merger, CVB Financial Corp. will issue 1.5 shares of its
common stock for each outstanding share of Orange National Bancorp common stock.
CVB Financial Corp. estimates that it will issue approximately 3,000,300 shares
of common stock in the merger, and that current Orange National Bancorp
shareholders will hold approximately 16% of CVB Financial Corp.'s outstanding
common stock following the merger. CVB Financial Corp. will convert options to
purchase Orange National Bancorp common stock into options to purchase CVB
Financial Corp. common stock.

               Orange National Bancorp has also granted CVB Financial Corp. an
option to purchase shares equal to 19.9% of the outstanding shares of Orange
National Bancorp common stock. The option is exercisable upon the occurrence of
certain events, including Orange National Bancorp's acquisition by someone other
than CVB Financial Corp.


<PAGE>   3

               CVB Financial Corp. has also announced that it has terminated its
stock repurchase plan. Between August 21, 1998 and May 18, 1999, CVB repurchased
234,473 shares of its common stock. CVB had originally authorized the repurchase
of up to 500,000 shares or $9 million of its common stock.

               CVB Financial Corp. has attached to this Report on Form 8-K as
Exhibits 2.1 and 10.1 copies of the executed Reorganization Agreement and the
Stock Option Agreement, respectively. Exhibit 99.1, the CVB Financial Corp. May
18, 1999 press release, contains additional information about the Reorganization
Agreement and the termination of the stock repurchase plan.

ITEM 6. RESIGNATIONS OF REGISTRANT'S DIRECTORS

               NOT APPLICABLE

ITEM 7. FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS.

               (a)    FINANCIAL STATEMENTS

                      NOT APPLICABLE

               (b)    PRO FORMA FINANCIAL INFORMATION

                      NOT APPLICABLE

               (c)    EXHIBITS

                      2.1     Agreement and Plan of Reorganization by and
                              between CVB Financial Corp. and Orange National
                              Bancorp, dated as of May 18, 1999.

                      10.1    Stock Option Agreement between CVB Financial Corp.
                              and Orange National Bancorp, dated as of May 18,
                              1999.

                      99.1    Press Release relating to the Agreement and Plan
                              of Reorganization.

ITEM 8. CHANGE IN FISCAL YEAR

               NOT APPLICABLE

ITEM 9. SALES OF EQUITY SECURITIES PURSUANT TO REGULATION S

               NOT APPLICABLE



<PAGE>   4


                                   SIGNATURES


               Pursuant to the requirements of the Securities Exchange Act of
1934, the registrant has duly caused this report to be signed on its behalf by
the undersigned hereunto duly authorized.



                                     CVB FINANCIAL CORP.
                                     (Registrant)



Date:  May 19, 1999                  By     /s/ D. Linn Wiley
                                         ------------------------------------
                                            D. Linn Wiley
                                            President and
                                            Chief Executive Officer


<PAGE>   5


                                  Exhibit Index


2.1            Agreement and Plan of Reorganization, dated May 18, 1999

10.1           Stock Option Agreement, dated May 18, 1999

99.1           Press Release, dated May 18, 1999




<PAGE>   1


                                   EXHIBIT 2.1

                      AGREEMENT AND PLAN OF REORGANIZATION












<PAGE>   2
















                      AGREEMENT AND PLAN OF REORGANIZATION


                                 BY AND BETWEEN


                               CVB FINANCIAL CORP.


                                       AND


                             ORANGE NATIONAL BANCORP









                                  MAY 18, 1999




<PAGE>   3

                      AGREEMENT AND PLAN OF REORGANIZATION



                                TABLE OF CONTENTS


<TABLE>
                                                                                          PAGE
                                                                                          ----
<S>                                                                                        <C>
ARTICLE 1.        DEFINITIONS...............................................................1

ARTICLE 2.        TERMS OF MERGER AND BANK MERGER...........................................7

        2.2    Stock of ONB.................................................................8

               2.2.1  Conversion of ONB Stock...............................................8

               2.2.2  ONB Perfected Dissenting Shares.......................................8

               2.2.3  Shares Held by CVB or CBB.............................................8

               2.2.4  Dividends, Splits Etc.................................................8

        2.3    Effect on CVB Stock..........................................................8

        2.4    Fractional Shares............................................................9

        2.5    Exchange Procedures..........................................................9

        2.6    Directors of Surviving Corporation..........................................11

        2.7    Executive Officers of Surviving Corporation.................................11

        2.8    Effect of Bank Merger and Surviving Bank....................................11

        2.9    Directors of Surviving Bank.................................................11

        2.10   Executive Officers of Surviving Bank........................................11

ARTICLE 3.        THE CLOSING..............................................................11

        3.1    Closing Date................................................................11

        3.2    Execution of Agreements.....................................................12

        3.3    Further Assurances..........................................................12

ARTICLE 4.        REPRESENTATIONS AND WARRANTIES OF ONB....................................12

        4.1    Incorporation, Standing and Power...........................................12

        4.2    Capitalization..............................................................12

        4.3    Subsidiaries................................................................13

        4.4    Financial Statements........................................................13

        4.5    Reports and Filings.........................................................14

        4.6    Authority of ONB............................................................14

        4.7    Insurance...................................................................15

        4.8    Personal Property...........................................................15

        4.9    Real Estate.................................................................15

        4.10   Litigation..................................................................16

</TABLE>





                                       i

<PAGE>   4


                                TABLE OF CONTENTS
                                   (CONTINUED)


<TABLE>
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                                                                                          ----
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        4.11   Taxes.......................................................................16

        4.12   Compliance with Laws and Regulations........................................18

        4.13   Performance of Obligations..................................................20

        4.14   Employees...................................................................20

        4.15   Brokers and Finders.........................................................20

        4.16   Material Contracts..........................................................20

        4.17   Certain Material Changes....................................................22

        4.20   Employee Benefit Plans......................................................23

        4.21   Corporate Records...........................................................26

        4.22   Accounting Records..........................................................26

        4.23   Offices and ATMs............................................................26

        4.24   Operating Losses............................................................26

        4.25   Loan Portfolio..............................................................26

        4.26   Investment Securities.......................................................27

        4.27   Power of Attorney...........................................................27

        4.28   Facts Affecting Regulatory Approvals........................................27

        4.29   Accounting and Tax Matters..................................................27

        4.30   Indemnification.............................................................27

        4.31   Community Reinvestment Act..................................................27

        4.32   Derivative Transactions.....................................................27

        4.33   Trust Administration........................................................28

        4.34   Disclosure Documents and Applications.......................................28

        4.35   Intellectual Property.......................................................28

        4.36   Year 2000...................................................................28

        4.37   Insider Loans; Other Transactions...........................................29

        4.38   Registration Obligation.....................................................29

        4.39   SBA Lending.................................................................29

        4.40   Accuracy and Currentness of Information Furnished...........................29

ARTICLE 5.        REPRESENTATIONS AND WARRANTIES OF CVB....................................29

        5.1    Incorporation, Standing and Power...........................................29

</TABLE>





                                       ii
<PAGE>   5


                                TABLE OF CONTENTS
                                   (CONTINUED)


<TABLE>
                                                                                          PAGE
                                                                                          ----
<S>                                                                                        <C>

        5.2    Capitalization..............................................................30

        5.3    Financial Statements........................................................30

        5.4    Reports and Filings.........................................................30

        5.5    Authority...................................................................31

        5.6    Subsidiaries................................................................31

        5.7    Brokers and Finders.........................................................32

        5.8    Insurance...................................................................32

        5.9    Certain Material Changes....................................................32

        5.10   Licenses and Permits........................................................32

        5.11   Compliance with Laws and Regulations........................................33

        5.12   Corporate Records...........................................................33

        5.13   Accounting Records..........................................................33

        5.14   Facts Affecting Regulatory Approvals........................................33

        5.15   Accounting and Tax Matters..................................................33

        5.16   Disclosure Documents and Applications.......................................33

        5.17   AMEX Listing................................................................33

        5.18   Employees...................................................................34

        5.19   Year 2000...................................................................34

        5.20   Litigation..................................................................34

        5.21   Taxes.......................................................................34

        5.22   Performance of Obligations..................................................35

        5.23   Employee Benefit Plans......................................................35

        5.24   Community Reinvestment Act..................................................36

        5.25   Derivative Transactions.....................................................36

        5.26   Intellectual Property.......................................................36

        5.27   Accuracy and Currentness of Information Furnished...........................36

ARTICLE 6.        COVENANTS OF ONB PENDING EFFECTIVE TIME OF THE MERGER....................36

        6.1    Limitation on Conduct Prior to Effective Time of the Merger.................36

        6.2    Affirmative Conduct Prior to Effective Time of the Merger...................40

</TABLE>





                                      iii

<PAGE>   6


                                TABLE OF CONTENTS
                                   (CONTINUED)


<TABLE>
                                                                                          PAGE
                                                                                          ----
<S>                                                                                        <C>

        6.3    Access to Information.......................................................41

        6.4    Review by Accountants.......................................................42

        6.5    Filings.....................................................................42

        6.6    Notices; Reports............................................................42

        6.7    ONB Shareholders' Meeting...................................................43

        6.8    Certain Loans and Other Extensions of Credit................................43

        6.9    Applications................................................................44

        6.10   Affiliate Agreements........................................................44

        6.11   Coordination of Dividends...................................................44

        6.12   Bank Merger.................................................................44

        6.13   Mortgage Brokerage..........................................................44

ARTICLE 7.        COVENANTS OF CVB PENDING EFFECTIVE TIME OF THE MERGER....................45

        7.1    Limitation on Conduct Prior to Effective Time of the Merger.................45

        7.2    Affirmative Conduct of CVB and Subsidiaries Prior to Effective Time of
               the Merger..................................................................45

        7.3    Access to Information.......................................................45

        7.4    Filings.....................................................................46

        7.5    Applications................................................................46

        7.6    Blue Sky....................................................................47

        7.7    Notices; Reports............................................................47

        7.8    Removal of Conditions.......................................................47

        7.9    Stock Options...............................................................47

        7.10   Reservation, Issuance and Registration of CVB Stock.........................48

        7.11   AMEX Listing................................................................48

        7.12   CVB Shareholders' Meeting...................................................48

ARTICLE 8.        ADDITIONAL COVENANTS.....................................................48

        8.1    Best Efforts................................................................48

        8.2    Public Announcements........................................................49

        8.3    Environmental Assessment and Remediation....................................49

        8.4    Execution of Stock Option Agreement.........................................49
</TABLE>





                                       iv
<PAGE>   7


                                TABLE OF CONTENTS
                                   (CONTINUED)


<TABLE>
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                                                                                          ----
<S>                                                                                        <C>

ARTICLE 9.        CONDITIONS PRECEDENT TO THE MERGER.......................................50

        9.1    Shareholder Approval........................................................50

        9.2    No Judgments or Orders......................................................50

        9.3    Regulatory Approvals........................................................50

        9.4    Securities Laws.............................................................50

        9.5    Listing.....................................................................50

        9.6    Tax Opinions................................................................50

        9.7    Pooling of Interests........................................................50

ARTICLE 10.       CONDITIONS PRECEDENT TO THE OBLIGATIONS OF ONB...........................51

        10.1   Legal Opinion...............................................................51

        10.2   Representations and Warranties; Performance of Covenants....................51

        10.3   Authorization of Merger.....................................................51

        10.4   Absence of Certain Changes..................................................51

        10.5   Officers' Certificate.......................................................52

        10.6   Fairness Opinion............................................................52

ARTICLE 11.       CONDITIONS PRECEDENT TO OBLIGATIONS OF CVB...............................52

        11.1   Legal Opinion...............................................................52

        11.2   Representations and Warranties; Performance of Covenants....................52

        11.3   Authorization of Mergers....................................................53

        11.4   Third-Party Consents........................................................53

        11.5   Absence of Certain Changes..................................................53

        11.6   Officers' Certificate.......................................................53

        11.7   Fairness Opinion............................................................53

        11.8   Shareholder's Agreements....................................................53

        11.9   Agreements Not to Compete...................................................53

        11.10  Affiliates Agreements.......................................................53

        11.11  Employee Benefit Plans......................................................54

        11.12  Dissenting Shares...........................................................54

        11.13  Resignations................................................................54

ARTICLE 12.       EMPLOYEE BENEFITS........................................................54
</TABLE>





                                       v

<PAGE>   8


                                TABLE OF CONTENTS
                                   (CONTINUED)


<TABLE>
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                                                                                          ----
<S>                                                                                        <C>

        12.1   Employee Benefits...........................................................54

ARTICLE 13.       TERMINATION..............................................................54

        13.1   Termination.................................................................54

        13.2   Termination Date............................................................55

        13.3   Effect of Termination.......................................................56

        13.4   Force Majeure...............................................................56

ARTICLE 14.       MISCELLANEOUS............................................................56

        14.1   Expenses....................................................................56

        14.2   Notices.....................................................................57

        14.3   Successors and Assigns......................................................57

        14.4   Counterparts................................................................57

        14.5   Effect of Representations and Warranties....................................58

        14.6   Third Parties...............................................................58

        14.7   Lists; Exhibits; Integration................................................58

        14.8   Knowledge...................................................................58

        14.9   Governing Law...............................................................58

        14.10  Captions....................................................................58

        14.11  Severability................................................................58

        14.12  Waiver and Modification; Amendment..........................................58

        14.13  Attorneys' Fees.............................................................59
</TABLE>



<PAGE>   9

               THIS AGREEMENT AND PLAN OF REORGANIZATION ("Agreement") is made
and entered into as of the 18th day of May 1999, by and between CVB FINANCIAL
CORP., a California corporation ("CVB"), and ORANGE NATIONAL BANCORP, a
California corporation ("ONB").

               WHEREAS, the Boards of Directors of CVB and ONB deem advisable
and in the best interests of their respective shareholders the merger of ONB
with and into CVB (the "Merger") upon the terms and conditions set forth herein
and in accordance with the California General Corporation Law (the "CGCL") (CVB,
following the effectiveness of the Merger, being hereinafter sometimes referred
to as the "Surviving Corporation");

               WHEREAS, the Boards of Directors of CVB and ONB have approved the
Merger pursuant to this Agreement and the Agreement of Merger by and between CVB
and ONB (the "Agreement of Merger"), in substantially the form of Exhibit A
attached hereto, pursuant to which ONB will merge with and into CVB and each
outstanding share of ONB common stock, no par value ("ONB Stock"), excluding any
ONB Perfected Dissenting Shares (as defined below), will be converted into the
right to receive a specified amount of CVB common stock, no par value ("CVB
Stock"), upon the terms and subject to the conditions set forth herein; and

               WHEREAS, the Boards of Directors of CVB and ONB deem advisable
and in the best interests of their respective shareholders that immediately
following the Merger, upon the terms and conditions set forth in the Agreement
of Bank Merger, substantially in the form of Exhibit B attached hereto, and in
accordance with the CGCL and the California Financial Code (the "CFC"), that
Orange National Bank, a national banking association ("Orange"), be merged (the
"Bank Merger") with, and into, Citizens Business Bank, a California banking
corporation ("CBB") (Citizens Business Bank, following the effectiveness of the
Bank Merger, being hereinafter sometimes referred to as the "Surviving Bank");

               WHEREAS, the Merger and the Bank Merger are each 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 "Code").

               NOW, THEREFORE, on the basis of the foregoing recitals and in
consideration of the mutual covenants, agreements, representations and
warranties contained herein, the parties hereto do covenant and agree as
follows:


                                   ARTICLE 1.

                                   DEFINITIONS

               Except as otherwise expressly provided for in this Agreement, or
unless the context otherwise requires, as used throughout this Agreement the
following terms shall have the respective meanings specified below:

               "Affiliate" of, or a person "Affiliated" with, a specific
person(s) is a person that directly or indirectly, through one or more
intermediaries, controls, or is controlled by, or is under common control with,
the person(s) specified.


<PAGE>   10

               "Affiliated Group" means, with respect to any entity, a group of
entities required or permitted to file consolidated, combined or unitary Tax
Returns (as defined herein).

               "Agreement of Merger" has the meaning set forth in the second
recital of this Agreement.

               "Agreement of Bank Merger" has the meaning set forth in the third
recital of this Agreement.

               "AMEX" means the American Stock Exchange or any successor
thereto.

               "Average Closing Price" means the average of the daily closing
price of a share of CVB Stock reported on the American Stock Exchange during the
15 consecutive trading days ending at the end of the fifth trading day
immediately preceding the Effective Time of the Merger (as defined herein).

               "Bank Merger" means the merger of Orange with and into CBB.

               "Benefit Arrangements" has the meaning set forth in Section
4.20.2.

               "BHC Act" means the Bank Holding Company Act of 1956, as amended.

               "Business Day" means any day other than a Saturday, Sunday or day
on which a bank chartered under the laws of the State of California is closed.

               "CBB" means Citizens Business Bank, a wholly owned subsidiary of
CVB.

               "CFC" means California Financial Code.

               "CGCL" has the meaning set forth in the second recital of this
Agreement.

               "CVB" means CVB Financial Corp.

               "Certificates" has the meaning set forth in Section 2.5.2.

               "Classified Credits" has the meaning set forth in Section 6.8.

               "Closing" means the consummation of the Merger and the Bank
Merger provided for in Article 2 of this Agreement on the Closing Date (as
defined herein) at the offices of Manatt, Phelps & Phillips, LLP, 11355 West
Olympic Boulevard, Los Angeles, California 90064, or at such other place as the
parties may agree upon.

               "Closing Date" means the date which is the first Friday, or such
other day mutually agreed to by the parties hereto, which follows the last to
occur of (i) the approval of this Agreement and the transactions contemplated
hereby by the shareholders of ONB and CVB, as necessary, (ii) the receipt of all
permits, authorizations, approvals and consents specified in Section 9.3 hereof,
and (iii) the expiration of all applicable notice and waiting periods under the
law; provided, however, that if the Closing shall not have occurred by December
15, 1999, CVB



<PAGE>   11

shall have the discretion to delay the Closing until the first Friday after
January 15, 2000 following the last to occur of (i), (ii) and (iii) above.

               "Code" shall have the meaning set forth in the fourth recital of
this Agreement.

               "Commissioner" means the Commissioner of the Department of
Financial Institutions of the State of California.

               "Competing Transaction" has the meaning set forth in Section
6.1.14.

               "Comptroller" means the Comptroller of the Currency.

               "Conversion Ratio" has the meaning set forth in Section 2.2.1.

               "Covered Person" has the meaning set forth in Section 4.30.

               "CVB 401(k) Plan" means the CVB Financial Corp. 401(k) Profit
Sharing Plan.

               "CVB Conflicts and Consents List" has the meaning set forth in
Section 5.5.

               "CVB Derivatives List" has the meaning set forth in Section 5.25.

               "CVB Dissenting Shares" means any shares of CVB Stock held by
"dissenting shareholders" within the meaning of Chapter 13 of the CGCL.

               "CVB Filings" has the meaning set forth in Section 5.4.

               "CVB Intellectual Property List" has the meaning set forth in
Section 5.26.

               "CVB Litigation List" has the meaning set forth in Section 5.20.

               "CVB Perfected Dissenting Shares" means any CVB Dissenting Shares
which the holders thereof have not withdrawn or caused to lose their status as
CVB Dissenting Shares.

               "CVB Shareholders Meeting" means the meeting of CVB's
shareholders referred to in 7.12.

               "CVB Stock" has the meaning set forth in the second recital of
this Agreement.

               "CVB Stock Option Plan" means the CVB Financial Corp. 1991 Stock
Option Plan, as amended.

               "CVB Supplied Information" has the meaning set forth in Section
5.16.

               "CVB Tax List" has the meaning set forth in Section 5.21.

               "Deloitte & Touche" means Deloitte & Touche, LLP, CVB's
independent accountants.




<PAGE>   12


               "DFI" means the Department of Financial Institutions of the State
of California.

               "Effective Time of the Merger" means the date upon which the
Merger is consummated and the Agreement of Merger is filed with the Secretary of
State of the State of California.

               "Effective Time of the Bank Merger" means the date upon which the
Bank Merger is consummated and the Agreement of Bank Merger, bearing the
certification of the California Secretary of State, is filed with the
Commissioner of Financial Institutions.

               "Employee Plans" has the meaning set forth in Section 4.20.1.

               "Encumbrance" shall mean any option, pledge, security interest,
lien, charge, encumbrance or restriction (whether on voting or disposition or
otherwise), whether imposed by agreement, understanding, law or otherwise.

               "Environmental Regulations" has the meaning set forth in Section
4.12.2.

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

               "ERISA Affiliates" has the meaning set forth in Section 4.20.1.

               "Exchange Act" means the Securities Exchange Act of 1934, as
amended.

               "Exchange Agent" means ChaseMellon Shareholder Services, LLC or
such other agent(s) designated by CVB.

               "Exchange Fund" has the meaning set forth in Section 2.5.1
hereof.

               "FDIC" means the Federal Deposit Insurance Corporation

               "Financial Statements of CVB" means (i) the audited consolidated
financial statements of CVB consisting of the consolidated balance sheets as of
December 31, 1995, 1996, 1997 and 1998, and the related consolidated statements
of operations, shareholders' equity and cash flows for the years then ended and
the related notes thereto and related opinions thereon for the years then ended,
and (ii) the unaudited consolidated balance sheet as of March 31, 1999, and the
related consolidated statements of operations, shareholders' equity and cash
flows for the period then ended, and the related notes thereto.

               "Financial Statements of ONB" means (i) the audited consolidated
financial statements of ONB consisting of the consolidated statements of
condition as of December 31, 1995, 1996, 1997 and 1998, and the related
statements of operations, stockholders' equity and cash flows for the years s
then ended and the related notes thereto and related opinions thereon for the
periods then ended; and (ii) the unaudited consolidated balance sheet as of
March 31, 1999, and the related consolidated statements of operations,
shareholders' equity and cash flows for the period then ended, and the related
notes thereto.




<PAGE>   13


               "FRB" means the Board of Governors of the Federal Reserve System.

               "Governmental Entity" shall mean any court or tribunal with
jurisdiction over the relevant party or any United States federal, state,
municipal, domestic, foreign or other administrative authority or
instrumentality.

               "Hazardous Materials" has the meaning set forth in Section
4.12.2.

               "Immediate Family" means a person's spouse, parents, in-laws,
children and siblings.

               "Investment Security" means any equity security or debt security
as defined in Statement of Financial Accounting Standards No. 115.

               "IRS" means the Internal Revenue Service.

               "M&P" means McGladry and Pullen, LLP, ONB's independent
accountants.

               "Mortgage Brokerage" means ONB Mortgage Corporation, a California
corporation and wholly owned subsidiary of ONB.

               "OCC" means the Office of the Comptroller of the Currency.

               "ONB 401(k) Plan" means the Orange National Bancorp 401(k) Plan.

               "ONB Conflicts and Consents List" has the meaning set forth in
Section 4.6.

               "ONB Contract List" has the meaning set forth in Section 4.16.

               "ONB Derivatives List" has the meaning set forth in Section 4.32.

               "ONB Dissenting Shares" means any shares of ONB Stock held by
"dissenting shareholders" within the meaning of Chapter 13 of the CGCL.

               "ONB Employee Plan List" has the meaning set forth in Section
4.20.

               "ONB Environmental Compliance List" has the meaning set forth in
Section 4.12.2.

               "ONB Filings" has the meaning set forth in Section 4.5.

               "ONB Filings List" has the meaning set forth in Section 4.5.

               "ONB Indemnification List" has the meaning set forth in Section
4.30.

               "ONB Insurance List" has the meaning set forth in Section 4.7.

               "ONB Intellectual Property List" has the set forth in Section
4.35.




<PAGE>   14


               "ONB Investment Securities List" has the meaning set forth in
Section 4.26.

               "ONB List" means any list required to be furnished by ONB to CVB
herewith.

               "ONB Litigation List" has the meaning set forth in Section 4.10.

               "ONB Loan List" has the meaning set forth in Section 4.25.

               "ONB Offices List" has the meaning set forth in Section 4.23.

               "ONB Operating Losses List" has the meaning set forth in Section
4.24.

               "ONB Perfected Dissenting Shares" means ONB Dissenting Shares
which the holders thereof have not withdrawn or caused to lose their status as
ONB Dissenting Shares.

               "ONB Personal Property List" has the meaning set forth in Section
4.8.

               "ONB Real Property List" has the meaning set forth in Section
4.9.

               "ONB Shareholders' Meeting" means the meeting of ONB's
shareholders referred to in Section 6.7.

               "ONB Stock" has the meaning set forth in the second recital of
this Agreement.

               "ONB Stock Option" means any option issued pursuant to the ONB
Stock Option Plans.

               "ONB Stock Option Plans" means the Orange National Bancorp 1993
and 1997 Stock Option Plans, as amended.

               "ONB Supplied Information" has the meaning set forth in Section
4.34.

               "ONB Tax List" has the meaning set forth in Section 4.11.

               "ONB Undisclosed Liabilities List" has the meaning set forth in
Section 4.19.

               "Operating Loss" has the meaning set forth in Section 4.24.

               "Person" means any individual, corporation, association,
partnership, limited liability company, trust, joint venture, other entity,
unincorporated body, government or governmental department or agency.

               "Proxy Statement and Prospectus" means the Joint Proxy Statement
and Prospectus that is included as part of the Registration Statement on Form
S-4 (as defined herein) and used to solicit proxies for the ONB Shareholders'
Meeting and the CVB Shareholder's Meeting, as necessary, and to offer and sell
the shares of CVB Stock to be issued in connection with the Merger.




<PAGE>   15


               "Related Group of Persons" means Affiliates, members of an
Immediate Family or Persons the obligations of whom would be attributed to
another Person pursuant to the regulations promulgated by the SEC (as defined
herein).

               "Registration Statement on Form S-4" means the Registration
Statement on Form S-4, and such amendments thereto, that is filed with the SEC
to register the shares of CVB Stock to be issued in the Merger under the
Securities Act and includes the Proxy Statement and Prospectus in connection
with the ONB Shareholders' Meeting and CVB Shareholder's Meeting, as necessary,
pursuant to the regulations promulgated under the Exchange Act.

               "Scheduled Contracts" has the meaning set forth in Section 4.16.

               "SEC" means the Securities and Exchange Commission.

               "Securities Act" means the Securities Act of 1933, as amended.

               "Surviving Bank" has the meaning set forth in the fourth recital
of this Agreement.

               "Surviving Corporation" has the meaning set forth in the second
recital of this Agreement.

               "Tanks" has the meaning set forth in Section 4.12.2.

               "Tax Returns" means all returns, declarations, reports,
estimates, information returns and statements required to be filed in respect of
any Taxes.

               "Taxes" means (i) all federal, state, local or foreign taxes,
charges, fees, imposts, levies or other assessments, including, without
limitation, all net income, gross receipts, capital, sales, use, ad valorem,
value added, transfer, franchise, profits, inventory, capital stock, license,
withholding, payroll, employment, social security, unemployment, excise,
severance, stamp, occupation, property, corporation and estimated taxes, custom
duties, fees, assessments and charges of any kind whatsoever; (ii) all interest,
penalties, fines, additions to tax or additional amounts imposed by any taxing
authority in connection with any item described in clause (i); and (iii) any
transferred liability in respect of any items described in clauses (i) and/or
(ii).

               "Understanding" means any contract, agreement, understanding,
commitment or offer, whether oral or written, which may become a binding
obligation if accepted by another Person.


                                   ARTICLE 2.

                         TERMS OF MERGER AND BANK MERGER

        2.1 Effect of Merger and Surviving Corporation. At the Effective Time of
the Merger, ONB will be merged with and into CVB pursuant to the terms,
conditions and provisions of the Agreement of Merger and in accordance with the
applicable provisions of the CGCL. By virtue of the Merger, all the rights,
privileges, powers and franchises and all property




<PAGE>   16

and assets of every kind and description of ONB and CVB shall be vested in and
be held and enjoyed by the Surviving Corporation, without further act or deed,
and all the interests of every kind of ONB and CVB, including all debts due to
either of them on whatever account, shall be the property of the Surviving
Corporation as they were of ONB and CVB and the title to any interest in real
property and any interest in personal property vested by deed or otherwise in
either ONB or CVB shall not revert or be in any way impaired by reason of the
Merger; and all rights of creditors and liens upon any property of ONB and CVB
shall be preserved unimpaired and all debts, liabilities and duties of ONB and
CVB shall be debts, liabilities and duties of the Surviving Corporation and may
be enforced against it to the same extent as if said debts, liabilities and
duties had been incurred or contracted by it.

        2.2 Stock of ONB. Subject to Section 2.4, each share of ONB Stock issued
and outstanding immediately prior to the Effective Time of the Merger shall,
without any further action on the part of ONB or the holders of such shares, be
treated on the basis set forth herein.

            2.2.1 Conversion of ONB Stock. At the Effective Time of the Merger,
pursuant to the Agreement of Merger, each outstanding share of ONB Stock
excluding any ONB Perfected Dissenting Shares or shares of ONB Stock held by CVB
or CBB (other than those held in a fiduciary capacity or as a result of debts
previously contracted) shall, without any further action on the part of ONB or
the holders of any such shares, be automatically cancelled and cease to be an
issued and outstanding share of ONB Stock and be converted into one and one-half
(1 1/2) shares of CVB Stock (the "Conversion Ratio").

            2.2.2 ONB Perfected Dissenting Shares. ONB Perfected Dissenting
Shares shall not be converted into shares of CVB Stock, but shall, after the
Effective Time of the Merger, be entitled only to such rights as are granted
them by Chapter 13 of the CGCL. Each dissenting shareholder who is entitled to
payment for his shares of ONB Stock shall receive such payment in an amount as
determined pursuant to Chapter 13 of the CGCL.

            2.2.3 Shares Held by CVB or CBB. Shares of ONB Stock held by CVB or
CBB, if any (other than those held in a fiduciary capacity or as a result of
debts previously contracted), shall be canceled and no consideration shall be
issued in exchange therefor.

            2.2.4 Dividends, Splits Etc. If, prior to the Effective Time of the
Merger, CVB shall declare a stock dividend or stock distribution upon or
subdivide, split up, reclassify or combine the CVB Stock, or make a distribution
on the CVB Stock in any security convertible into CVB Stock, with a record date
prior to the Effective Time of the Merger, the Conversion Ratio will be adjusted
so that the shareholders of ONB will own the same percentage of the Surviving
Corporation that they would have owned if no such event had occurred.

        2.3 Effect on CVB Stock. On the Effective Time of the Merger, each
outstanding share of CVB Stock, excluding any CVB Perfected Dissenting Shares,
shall remain an outstanding share of CVB Stock and shall not be converted or
otherwise affected by the Merger.

            CVB Perfected Dissenting Shares shall, after the Effective Time of
the Merger, be entitled only to such rights as are granted them by Chapter 13 of
the CGCL. Each dissenting



<PAGE>   17


shareholder who is entitled to payment for his shares of CVB Stock shall receive
such payment in an amount as determined pursuant to Chapter 13 of the CGCL.

        2.4 Fractional Shares. No fractional shares of CVB Stock shall be issued
in the Merger. In lieu thereof, each holder of ONB Stock who would otherwise be
entitled to receive a fractional share shall receive an amount in cash equal to
the product (calculated to the nearest hundredth) obtained by multiplying (a)
the Average Closing Price times (b) the fraction of the share of CVB Stock to
which such holder would otherwise be entitled. No such holder shall be entitled
to dividends or other rights in respect of any such fraction.

        2.5 Exchange Procedures.

            2.5.1 As of the Effective Time of the Merger, CVB shall have
deposited with the Exchange Agent for the benefit of the holders of shares of
ONB Stock, for exchange in accordance with this Section 2.5 through the Exchange
Agent, certificates representing the shares of CVB Stock issuable pursuant to
Section 2.2 in exchange for shares of ONB Stock outstanding immediately prior to
the Effective Time of the Merger, and funds in an amount not less than the
amount of cash payable in lieu of fractional shares of CVB Stock which would
otherwise be issuable in connection with Section 2.2 hereof but for the
operation of Section 2.4 of this Agreement (collectively, the "Exchange Fund").

            2.5.2 CVB shall use its best efforts to ensure the Exchange Agent
will mail, promptly after the Effective Time of the Merger, to each holder of
record of a certificate or certificates which immediately prior to the Effective
Time of the Merger represented outstanding shares of ONB Stock (the
"Certificates") whose shares were converted into the right to receive shares of
CVB Stock pursuant to Section 2.2 hereof, (i) a letter of transmittal (which
shall specify that delivery shall be effected, and risk of loss and title to the
Certificates shall pass, only upon delivery of the Certificates to the Exchange
Agent and shall be in such form and have such other provisions as CVB and ONB
may reasonably specify), and (ii) instructions for use in effecting the
surrender of the Certificates in exchange for certificates representing shares
of CVB Stock. Upon surrender of a Certificate for cancellation to the Exchange
Agent, together with such letter of transmittal, duly executed, the holder of
such Certificate shall be entitled to receive in exchange therefor a certificate
representing that number of whole shares of CVB Stock and cash in lieu of
fractional shares which such holder has the right to receive pursuant to
Sections 2.2 and 2.4 hereof, and the Certificate so surrendered shall forthwith
be canceled. In the event a certificate is surrendered representing ONB Stock,
the transfer of ownership of which is not registered in the transfer records of
ONB, a certificate representing the proper number of shares of CVB Stock may be
issued to a transferee if the Certificate representing such ONB Stock is
presented to the Exchange Agent, accompanied by all documents required to
evidence and effect such transfer and by evidence that any applicable stock
transfer taxes have been paid. Until surrendered as contemplated by this Section
2.5, each Certificate shall be deemed at any time after the Effective Time of
the Merger to represent only the right to receive upon such surrender the
certificate representing shares of CVB Stock and cash in lieu of any fractional
shares of stock as contemplated by this Section 2.5. Notwithstanding anything to
the contrary set forth herein, if any holder of shares of ONB should be unable
to surrender the Certificates for such shares, because they have been lost or
destroyed, such holder may deliver in lieu thereof such bond in form and
substance and with surety reasonably satisfactory to CVB and shall be entitled
to



<PAGE>   18


receive the certificate representing the proper number of shares of CVB Stock
and cash in lieu of fractional shares in accordance with Sections 2.2 and 2.4
hereof.

            2.5.3 No dividends or other distributions declared or made with
respect to CVB Stock with a record date after the Effective Time of the Merger
shall be paid to the holder of any unsurrendered Certificate with respect to the
shares of CVB Stock represented thereby and no cash payment in lieu of
fractional shares shall be paid to any such holder pursuant to Section 2.4 until
the holder of record of such Certificate shall surrender such Certificate.
Subject to the effect of applicable laws, following surrender of any such
Certificate, there shall be paid to the record holder of the certificates
representing whole shares of CVB Common Stock issued in exchange thereof,
without interest, (i) at the time of such surrender, the amount of any cash
payable in lieu of a fractional share of CVB Stock to which such holder is
entitled pursuant to Section 2.4 and the amount of dividends or other
distributions with a record date after the Effective Time of the Merger
theretofore paid with respect to such whole shares of CVB Stock, and (ii) at the
appropriate payment date, the amount of dividends or other distributions with a
record date after the Effective Time of the Merger but prior to surrender and a
payment date subsequent to surrender payable with respect to such whole shares
of CVB Stock.

            2.5.4 All shares of CVB Stock issued upon the surrender for exchange
of ONB Stock in accordance with the terms hereof (including any cash paid
pursuant to Section 2.4) shall be deemed to have been issued in full
satisfaction of all rights pertaining to such shares of ONB Stock, and there
shall be no further registration of transfers on the stock transfer books of the
Surviving Corporation of the shares of ONB Stock which were outstanding
immediately prior to the Effective Time of the Merger. If, after the Effective
Time of the Merger, Certificates are presented to CVB for any reason, they shall
be canceled and exchanged as provided in this Agreement.

            2.5.5 Any portion of the Exchange Fund which remains undistributed
to the shareholders of ONB following the passage of six months after the
Effective Time of the Merger shall be delivered to CVB, upon demand, and any
shareholders of ONB who have not theretofore complied with this Section 2.5
shall thereafter look only to CVB for payment of their claim for CVB Stock, any
cash in lieu of fractional shares of CVB Stock and any dividends or
distributions with respect to CVB Stock.

            2.5.6 Neither CVB nor ONB shall be liable to any holder of shares of
ONB Stock for such shares (or dividends or distributions with respect thereto)
or cash from the Exchange Fund delivered to a public official pursuant to any
applicable abandoned property, escheat or similar law.

            2.5.7 The Exchange Agent shall not be entitled to vote or exercise
any rights of ownership with respect to the shares of CVB Stock held by it from
time to time hereunder, except that it shall receive and hold all dividends or
other distributions paid or distributed with respect to such shares of CVB Stock
for the account of the Persons entitled thereto.

            2.5.8 Certificates surrendered for exchange by any Person
constituting an "Affiliate" of ONB for purposes of Rule 144(a) under the
Securities Act shall not be exchanged



<PAGE>   19


for certificates representing whole shares of CVB Stock until CVB has received a
written agreement from such person as provided in Section 6.10.

        2.6 Directors of Surviving Corporation. Immediately after the Effective
Time of the Merger, the Board of Directors of the Surviving Corporation shall be
comprised of the persons serving as directors of CVB immediately prior to the
Effective Time of the Merger and, subject to the approval of the Board of
Directors of CVB, Mr. San Vaccaro. Such persons shall serve until the earlier of
their resignation or removal or until their respective successors are duly
elected and qualified.

        2.7 Executive Officers of Surviving Corporation. Immediately after the
Effective Time of the Merger, the executive officers of the Surviving
Corporation shall be comprised of the persons serving as executive officers of
CVB immediately prior to the Effective Time of the Merger. Such persons shall
serve until the earlier of their resignation or termination.

        2.8 Effect of Bank Merger and Surviving Bank. At the Effective Time of
the Bank Merger, Orange will be merged with and into CBB pursuant to the terms,
conditions and provisions of the Agreement of Bank Merger and in accordance with
the applicable provisions of the CGCL and the CFC. By virtue of the Bank Merger,
all the rights, privileges, powers and franchises and all property and assets of
every kind and description of Orange and CBB shall be vested in and be held by
the Surviving Bank, without further act or deed, and all the interests of every
kind of Orange and CBB, including all debts due to either of them on whatever
account, shall be the property of the Surviving Bank as they were of Orange and
CBB and the title to any interest in real property and any interest in personal
property vested by deed or otherwise in Orange and CBB shall not revert or be in
any way impaired by reason of the Bank Merger; and all rights of creditors and
liens upon any property of Orange and CBB shall be preserved unimpaired and all
debts, liabilities and duties of Orange and CBB shall be preserved unimpaired
and all debts, liabilities and duties of Orange and CBB shall be debts,
liabilities and duties of the Surviving Bank and may be enforced against it to
the same extent as if said debts, liabilities and duties had been incurred or
contracted by it.

        2.9 Directors of Surviving Bank. Immediately after the Effective Time of
the Bank Merger, the Board of Directors of the Surviving Bank shall be comprised
of the persons serving as directors of CBB immediately prior to the Effective
Time of the Bank Merger, and, subject to the approval of the Board of Directors
of CBB, Mr. San Vaccaro. Such persons shall serve until the earlier of their
expiration or removal or until their successors are duly elected and qualified.

        2.10 Executive Officers of Surviving Bank. Immediately after the
Effective Time of the Bank Merger, the executive officers of the Surviving Bank
shall be comprised of the persons serving as executive officers of CBB
immediately prior to the Effective Time of the Bank Merger. Such persons shall
serve until the earlier of their resignation or termination.


                                   ARTICLE 3.

                                   THE CLOSING

        3.1 Closing Date. The Closing shall take place on the Closing Date.



<PAGE>   20


        3.2 Execution of Agreements. As soon as practicable after execution of
this Agreement, the Agreement of Merger and the Agreement of Bank Merger
together with all other agreements necessary to consummate the transactions
described herein shall be executed by the parties thereto. On the Closing Date,
the Agreement of Merger, together with all requisite certificates, shall be duly
filed with the Secretary of State of the State of California as required by
applicable law and regulations. On the Closing Date, the Agreement of Bank
Merger, together with all requisite certificates, shall be duly filed with the
California Secretary of State and the Commissioner, as required by applicable
law and regulations.

        3.3 Further Assurances. At the Closing, the parties hereto shall
deliver, or cause to be delivered, such documents or certificates as may be
necessary in the reasonable opinion of counsel for any of the parties, to
effectuate the transactions contemplated by this Agreement. From and after the
Effective Time of the Merger, each of the parties hereto covenants and agrees,
without the necessity of any further consideration whatsoever, to execute,
acknowledge and deliver any and all other documents and instruments and take any
and all such other action as may be reasonably necessary or desirable to more
effectively carry out the intent and purpose of this Agreement, the Agreement of
Merger and the Agreement of Bank Merger.


                                   ARTICLE 4.

                      REPRESENTATIONS AND WARRANTIES OF ONB

            ONB represents and warrants to CVB as follows:

        4.1 Incorporation, Standing and Power. ONB has been duly organized, is
validly existing and in good standing as a corporation under the laws of the
State of California and is registered as a bank holding company under the BHC
Act. Orange is a national bank duly organized, validly existing and in good
standing under the laws of the United States and is authorized by the OCC to
conduct a general banking business. Mortgage Brokerage has been duly organized,
is validly existing and in good standing as a corporation under the laws of the
State of California. Orange's deposits are insured by the FDIC in the manner and
to the fullest extent provided by law. Each of ONB, Orange and Mortgage
Brokerage has all requisite corporate power and authority to own, lease and
operate its respective properties and assets and to carry on its business as
presently conducted. Neither the scope of the business of ONB, Orange or
Mortgage Brokerage nor the location of any of their respective properties
requires that either ONB, Orange or Mortgage Brokerage be licensed to do
business in any jurisdiction other than the State of California where the
failure to be so licensed would, individually or in the aggregate, have a
material adverse effect on the business, financial condition, results of
operations or prospects of ONB on a consolidated basis. ONB has delivered to CVB
true and correct copies of its, Orange's and Mortgage Brokerage's Articles of
Incorporation, Articles of Association, and Bylaws, as amended, and in effect as
of the date hereof.

        4.2 Capitalization.

            4.2.1 As of the date of this Agreement, the authorized capital stock
of ONB consists of 20,000,000 shares of ONB Stock, of which 2,000,171 shares are
outstanding. All of the outstanding shares of ONB Stock are duly authorized,
validly issued, fully paid and




<PAGE>   21


nonassessable. Except for ONB Options covering 232,283 shares of ONB Stock
granted pursuant to the ONB Stock Option Plans, there are no outstanding
options, warrants or other rights in or with respect to the unissued shares of
ONB Stock nor any securities convertible into such stock, and ONB is not
obligated to issue any additional shares of its common stock or any additional
options, warrants or other rights in or with respect to the unissued shares of
such stock or any other securities convertible into such stock. ONB has
furnished CVB a list (the "ONB Option List") setting forth the name of each
holder of a ONB Option, the number of shares of ONB Stock covered by each such
option, the vesting schedule of such option, the exercise price per share and
the expiration date of each such option.

            4.2.2 As of the date of this Agreement, the authorized capital stock
of Orange consists of 1,325,000 shares of common stock, $1.25 par value, of
which 1,002,920 shares are outstanding and all of which are owned of record and
beneficially by ONB. All of the outstanding shares of such common stock are duly
authorized, validly issued, fully paid, nonassessable and free and clear of all
Encumbrances. There are no outstanding options, warrants or other rights in or
with respect to the unissued shares of such common stock or any other securities
convertible into such stock, and Orange is not obligated to issue any additional
shares of its common stock or any options, warrants or other rights in or with
respect to the unissued shares of its common stock or any other securities
convertible into such stock.

            4.2.3 As of the date of this Agreement, the authorized capital stock
of Mortgage Brokerage consists of 100,000 shares of common stock, of which
10,000 shares are outstanding and all of which are owned of record and
beneficially by ONB, and there are no shares of preferred stock outstanding. All
of the outstanding shares of such common stock are duly authorized, validly
issued, fully paid, nonassessable and free and clear of all Encumbrances. There
are no outstanding options, warrants or other rights in or with respect to the
unissued shares of such common stock or any other securities convertible into
such stock, and Mortgage Brokerage is not obligated to issue any additional
shares of its common stock or any options, warrants or other rights in or with
respect to the unissued shares of its common stock or any other securities
convertible into such stock.

        4.3 Subsidiaries. Other than Orange and Mortgage Brokerage, ONB does not
own, directly or indirectly, the outstanding stock or equity or other voting
interest in any Person. Orange does not own, directly or indirectly, the
outstanding stock or equity or other voting interest in any Person. The
operations of Mortgage Brokerage are not material to the business or financial
condition of ONB, on a consolidated basis.

        4.4 Financial Statements. ONB has previously furnished to CVB a copy of
the Financial Statements of ONB. The Financial Statements of ONB: (a) present
fairly the consolidated financial condition of ONB as of the respective dates
indicated and its consolidated results of operations and statements of cash
flows, for the respective periods then ended, subject, in the case of the
unaudited interim financial statements, to normal recurring adjustments; (b)
have been prepared in accordance with generally accepted accounting principles
and/or applicable regulatory accounting principles or banking regulations
consistently applied (except as otherwise indicated therein); and (c) are based
upon the books and records of ONB.




<PAGE>   22


        4.5 Reports and Filings. Except as set forth in a list (the "ONB Filings
List"), since January 1, 1996, each of ONB, Orange and Mortgage Brokerage has
filed all reports, returns, registrations and statements (such reports and
filings referred to as "ONB Filings"), together with any amendments required to
be made with respect thereto, that were required to be filed with (a) the FDIC,
(b) the OCC, (c) the FRB, (d) the SEC and (e) any other applicable Governmental
Entity, including taxing authorities, except where the failure to file such
reports, returns, registrations or statements has not had and is not reasonably
expected to have a material adverse effect on the business, financial condition,
results of operations or prospects of ONB on a consolidated basis. No
administrative actions have been taken or orders issued in connection with such
ONB Filings. As of their respective dates, each of such ONB Filings (y) complied
in all material respects with all laws and regulations enforced or promulgated
by the Governmental Entity with which it was filed (or was amended so as to be
in compliance promptly following discovery of any such noncompliance); and (z)
did not contain any untrue statement of a material fact or omit to state a
material fact required to be stated therein or necessary to make the statements
therein, in light of the circumstances under which they were made, not
misleading. Any financial statement contained in any of such ONB Filings fairly
presented the financial position of ONB on a consolidated basis, ONB alone and
Orange alone, as the case may be, and was prepared in accordance with generally
accepted accounting principles or banking regulations consistently applied,
except as stated therein, during the periods involved, and except (other than
for those financial statements filed with the SEC) where any misstatement or
omission would not make the statements therein, in light of the circumstances
under which they were made, misleading. ONB has furnished CVB with true and
correct copies of all ONB Filings filed by ONB since January 1, 1996.

        4.6 Authority of ONB. The execution and delivery by ONB of this
Agreement and the Agreement of Merger and by Orange of the Agreement of Bank
Merger, subject to the requisite approval of the shareholders of ONB of this
Agreement and the transactions contemplated thereby and by ONB of the Agreement
of Bank Merger, the consummation of the transactions contemplated hereby and
thereby have been duly and validly authorized by all necessary corporate action
on the part of ONB and Orange. This Agreement is, and the Agreement of Merger
and Agreement of Bank Merger will be, upon due execution and delivery by the
respective parties thereto, a valid and binding obligation of ONB and Orange, as
the case may be, enforceable in accordance with their respective terms, except
as the enforceability thereof may be limited by bankruptcy, liquidation,
receivership, conservatorship, insolvency, moratorium or other similar laws
affecting the rights of creditors generally and by general equitable principles.
Except as set forth in a list furnished by ONB to CVB (the "ONB Conflicts and
Consents List"), neither the execution and delivery by ONB of this Agreement and
the Agreement of Merger, nor by Orange of the Agreement of Bank Merger, the
consummation of the transactions contemplated herein or therein, nor compliance
by ONB or Orange with any of the provisions hereof or thereof, will: (a)
conflict with or result in a breach of any provision of its or Orange's Articles
of Incorporation, as amended, Articles of Association, as amended, or Bylaws, as
amended of Orange and ONB; (b) constitute a breach of or result in a default (or
give rise to any rights of termination, cancellation or acceleration, or any
right to acquire any securities or assets) under any of the terms, conditions or
provisions of any note, bond, mortgage, indenture, franchise, license, permit,
agreement or other instrument or obligation to which ONB or Orange is a party,
or by which ONB or Orange or any of their respective properties or assets are
bound; (c) result in the creation or imposition of any Encumbrance on any of the
properties



<PAGE>   23


or assets of ONB or Orange; or (d) violate any order, writ, injunction, decree,
statute, rule or regulation applicable to ONB or Orange or any of their
respective properties or assets. Except as set forth in the ONB Conflicts and
Consents List, no consent of, approval of, notice to or filing with any
Governmental Entity having jurisdiction over any aspect of the business or
assets of ONB or Orange, and no consent of, approval of or notice to any other
Person, is required in connection with the execution and delivery by ONB of this
Agreement and the Agreement of Merger, and by Orange of the Agreement of Bank
Merger, or the consummation by ONB of the Merger and by Orange of the Bank
Merger or the transactions contemplated hereby or thereby, except (i) the
approval of this Agreement and the Agreement of Merger and the transactions
contemplated hereby and thereby by the shareholders of ONB and of the Agreement
of Bank Merger by ONB; (ii) such approvals as may be required by the FRB, the
FDIC and the DFI; (iii) the filing and the effectiveness of the Proxy Statement
and Prospectus and Registration Statement on Form S-4 with the SEC; and (iv) the
filing and acceptance of the Agreement of Merger with the Secretary of State and
the Agreement of Bank Merger with the Secretary of State and the DFI.

        4.7 Insurance. Each of ONB, Orange and Mortgage Brokerage has policies
of insurance and bonds with respect to its assets and business against such
casualties and contingencies and in such amounts, types and forms as are
customarily appropriate for its business, operations, properties and assets. All
such insurance policies and bonds are in full force and effect. Except as set
forth in a list furnished by ONB to CVB (the "ONB Insurance List"), no insurer
under any such policy or bond has canceled or indicated an intention to cancel
or not to renew any such policy or bond or generally disclaimed liability
thereunder. Except as set forth in the ONB Insurance List, neither ONB, Orange
or Mortgage Brokerage is in default under any such policy or bond and all
material claims thereunder have been filed in a timely fashion. Set forth in the
ONB Insurance List is a list of all policies of insurance carried and owned by
ONB, Orange or Mortgage Brokerage showing the name of the insurance company, the
nature of the coverage, the policy limit, the annual premiums and the expiration
dates. There has been delivered to CVB a copy of each such policy of insurance.

        4.8 Personal Property. Each of ONB, Orange and Mortgage Brokerage has
good and marketable title to all its material properties and assets, other than
real property, owned or stated to be owned by ONB, Orange or Mortgage Brokerage,
free and clear of all Encumbrances except: (a) as set forth in the Financial
Statements of ONB; (b) for Encumbrances for current taxes not yet due; (c) for
Encumbrances incurred in the ordinary course of business; (d) for Encumbrances
that are not substantial in character, amount or extent and that do not
materially detract from the value, or interfere with present use, of the
property subject thereto or affected thereby, or otherwise materially impair the
conduct of business of ONB, Orange or Mortgage Brokerage; or (e) as set forth in
a list furnished by ONB to CVB (the "ONB Personal Property List").

        4.9 Real Estate. ONB has furnished CVB a list of real property,
including leaseholds and all other interests in real property (other than
security interests), owned by ONB, Orange and Mortgage Brokerage (the "ONB Real
Property List"). Each of ONB, Orange and Mortgage Brokerage has duly recorded or
caused to be recorded, in the appropriate county, all recordable interests in
the real property described in the ONB Real Property List. ONB, Orange and
Mortgage Brokerage have good and marketable title to their respective real
property, and valid




<PAGE>   24


leasehold interests in the leaseholds, described in the ONB Real Property List,
free and clear of all Encumbrances, except (a) for rights of lessors, co-lessees
or sublessees in such matters that are reflected in the lease; (b) for current
taxes not yet due and payable; (c) for such Encumbrances, if any, as do not
materially detract from the value of or materially interfere with the present
use of such property; and (d) as described in the ONB Real Property List. ONB
has furnished CVB with true and correct copies of all leases included in the ONB
Real Property List, all title insurance policies and all documents evidencing
recordation of all recordable interests in real property included in the ONB
Real Property List.

        4.10 Litigation. Except as set forth in a list furnished by ONB to CVB
(the "ONB Litigation List"), there is no private or governmental suit, claim,
action or proceeding pending, nor to ONB's knowledge threatened, against ONB,
Orange or Mortgage Brokerage or against any of their respective directors,
officers or employees relating to the performance of their duties in such
capacities or against or affecting any properties of ONB, Orange or Mortgage
Brokerage which, if adversely determined, would have, individually or in the
aggregate, a material adverse effect upon the business, financial condition or
results of operations of ONB on a consolidated basis, or the transactions
contemplated hereby, or which may involve a judgment against ONB, Orange or
Mortgage Brokerage in excess of $25,000. Also, except as disclosed in the ONB
Litigation List, there are no material judgments, decrees, stipulations or
orders against ONB, Orange or Mortgage Brokerage or enjoining their respective
directors, officers or employees in respect of, or the effect of which is to
prohibit, any business practice or the acquisition of any property or the
conduct of business in any area.

        4.11 Taxes.

             (a) Except as set forth in a list furnished by ONB to CVB (the "ONB
Tax List"), (A) all material Tax Returns required to be filed by or on behalf of
ONB, Orange or any of their subsidiaries or the Affiliated Group(s) of which any
of them is or was a member have been duly and timely filed with the appropriate
taxing authorities in all jurisdictions in which such Tax Returns are required
to be filed (after giving effect to any valid extensions of time in which to
make such filings), and all such Tax Returns were true, complete and correct in
all material respects; (B) all Taxes due and payable by or on behalf of ONB,
Orange or any of their subsidiaries, either directly, as part of an Affiliated
Group Tax Return, or otherwise, have been fully and timely paid, except to the
extent adequately reserved therefor in accordance with generally accepted
accounting principles and/or applicable regulatory accounting principles or
banking regulations consistently applied on the ONB balance sheet, and adequate
reserves or accruals for Taxes have been provided in the ONB balance sheet with
respect to any period through the date thereof for which Tax Returns have not
yet been filed or for which Taxes are not yet due and owing; and (C) no
agreement, waiver or other document or arrangement extending or having the
effect of extending the period for assessment or collection of Taxes (including,
but not limited to, any applicable statute of limitation) has been executed or
filed with any taxing authority by or on behalf of ONB, Orange or any of their
subsidiaries, or any Affiliated Group(s) of which any of them is or was a
member.

             (b) ONB, Orange and Mortgage Brokerage have complied in all
material respects with all applicable laws, rules and regulations relating to
the payment and withholding



<PAGE>   25


of Taxes and have duly and timely withheld from employee salaries, wages and
other compensation and have paid over to the appropriate taxing authorities all
amounts required to be so withheld and paid over for all periods under all
applicable laws.

             (c) CVB has received complete copies of (i) all material income or
franchise Tax Returns of ONB and Orange relating to the taxable periods since
January 1, 1996 and (ii) any audit report issued within the last three years
relating to any material Taxes due from or with respect to ONB and Orange with
respect to their respective income, assets or operations.

             (d) Except as set forth in the ONB Tax List, no claim has been made
by a taxing authority in a jurisdiction where ONB or Orange do not file an
income or franchise Tax Return such that ONB and Orange are or may be subject to
taxation by that jurisdiction.

             (e) Except as set forth in the ONB Tax List: (i) all deficiencies
asserted or assessments made as a result of any examinations by any taxing
authority of the Tax Returns of or covering or including ONB and Orange have
been fully paid, and there are no other audits or investigations by any taxing
authority in progress, nor have ONB and Orange received any notice from any
taxing authority that it intends to conduct such an audit or investigation; (ii)
no requests for a ruling or a determination letter are pending with any taxing
authority; and (iii) no issue has been raised in writing by any taxing authority
in any current or prior examination which, by application of the same or similar
principles, could reasonably be expected to result in a proposed deficiency
against ONB or Orange for any subsequent taxable period that could be material.

             (f) Except as set forth in the ONB Tax List, neither ONB, Orange
nor any other Person on behalf of ONB or Orange has (i) filed a consent pursuant
to Section 341(f) of the Code or agreed to have Section 341(f)(2) of the Code
apply to any disposition of a subsection (f) asset (as such term is defined in
Section 341(f)(4) of the Code) owned by ONB, Orange or any of their subsidiaries
(ii) agreed to or is required to make any adjustments pursuant to Section 481(a)
of the Code or any similar provision of state, local or foreign law by reason of
a change in accounting method initiated by ONB, Orange or any of their
subsidiaries or has any knowledge that the Internal Revenue Service has proposed
any such adjustment or change in accounting method, or has any application
pending with any taxing authority requesting permission for any changes in
accounting methods that relate to the business or operations of ONB, Orange or
any of their subsidiaries or (iii) executed or entered into a closing agreement
pursuant to Section 7121 of the Code or any predecessor provision thereof or any
similar provision of state, local or foreign law with respect to ONB, Orange or
any of their subsidiaries.

             (g) Except as set forth in the ONB Tax List, no property owned by
ONB or Orange is (i) property required to be treated as being owned by another
Person pursuant to provisions of Section 168(f)(8) of the Internal Revenue Code
of 1954, as amended and in effect immediately prior to the enactment of the Tax
Reform Act of 1986, (ii) constitutes "tax-exempt use property" within the
meaning of Section 168(h)(1) of the Code or (iii) is "tax-exempt bond financed
property" within the meaning of Section 168(g) of the Code.




<PAGE>   26


             (h) Neither ONB (except with Orange) nor Orange (except with ONB)
is a party to any Tax Sharing Agreement or similar agreement or arrangement
(whether written or not written) pursuant to which it will have any obligation
to make any payments after the Closing.

             (i) Except as set forth in the ONB Tax List, there is no contract,
agreement, plan or arrangement covering any Person that, individually or
collectively, could give rise to the payment of any amount that would not be
deductible by ONB, Orange or any of their subsidiaries or their respective
affiliates by reason of Section 280G of the Code, or would constitute
compensation in excess of the limitation set forth in Section 162(m) of the
Code.

             (j) There are no liens as a result of any unpaid Taxes upon any of
the assets of ONB or Orange.

             (k) Except as set forth in the ONB Tax List, ONB, Orange or any of
their subsidiaries have no elections in effect for federal income tax purposes
under Sections 108, 168, 338, 441, 472, 1017, 1033, or 4977 of the Code.

             (l) Except as set forth in the ONB Tax list, none of the members
of ONB's Affiliated Group has any net operating loss carryovers.

             (m) ONB agrees, and agrees to cause Orange, to cooperate with tax
counsel in furnishing reasonable and customary written tax representations to
tax counsel for purposes of supporting tax counsel's opinion that each of the
Merger and the Bank Merger qualify as a tax-deferred reorganization within the
meaning of Section 368(a) of the Code as contemplated in Section 9.6 hereof.

        4.12 Compliance with Laws and Regulations.

             4.12.1 Neither ONB, Orange or Mortgage Brokerage is in default
under or in breach or violation of (i) any provision of its respective Articles
of Incorporation, as amended, Articles of Association, as amended, or Bylaws, as
amended, or (ii) law, ordinance, rule or regulation promulgated by any
Governmental Entity, except, with respect to this clause (ii), for such
defaults, breaches or violations as would not have, individually or in the
aggregate, a material adverse effect on the business, financial condition,
results of operations or prospects of ONB on a consolidated basis.

             4.12.2 Except as set forth on a list furnished by ONB to CVB (the
"ONB Environmental Compliance List"), to the best of ONB's knowledge (i) each of
ONB, Orange and Mortgage Brokerage is in compliance with all Environmental
Regulations; (ii) there are no Tanks on or about ONB Property; (iii) there are
no Hazardous Materials on, below or above the surface of, or migrating to or
from ONB Property in concentrations above de minimis levels that would require
remedial action; (iv) neither ONB, Orange or Mortgage Brokerage has loans
outstanding secured by real property that is not in compliance with
Environmental Regulations or which has a leaking Tank or upon which there are
Hazardous Materials on or migrating to or from, in concentrations above de
minimis levels that would require remedial action, ONB Property; and (v) without
limiting Section 4.10 or the foregoing representations and warranties contained
in clauses (i) through (iv), as of the date of this Agreement, there is no
written claim, action, suit, or proceeding or notice thereof before any
Governmental Entity pending against




<PAGE>   27

ONB or Orange or Mortgage Brokerage or concerning property securing ONB or
Orange or Mortgage Brokerage loans and there is no outstanding judgment, order,
writ, injunction, decree, or award against or affecting ONB Property or property
securing ONB or Orange loans, relating to the foregoing representations (i) -
(iv), in each case the noncompliance with which, or the presence of which would
have a material adverse effect on the business, financial condition, results of
operations or prospects of ONB on a consolidated basis. For purposes of this
Section 4.12.2, the term "Environmental Regulations" shall mean all applicable
statutes, regulations, rules, and ordinances of all Governmental Entities and
all applicable judicial, administrative, and regulatory decrees, judgments, and
orders relating to the protection of human health or the environment, including,
without limitation: all requirements, including, but not limited to those
pertaining to reporting, licensing, permitting, investigation, and remediation
of emissions, discharges, releases, or threatened releases of Hazardous
Materials, into the air, surface water, groundwater, or land, or relating to the
manufacture, processing, distribution, use, treatment, storage, disposal,
transport, or handling of Hazardous Materials whether solid, liquid, or gaseous
in nature and all requirements pertaining to the protection of the health and
safety of employees or the public. "ONB Property" shall mean real estate
currently owned, or leased, or in which ONB, Orange or Mortgage Brokerage has an
investment or security interest (by mortgage, deed of trust, sale or
lease-back), including, without limitation, properties under foreclosure and
properties held by ONB or Orange in its capacity as a trustee. "Tank" shall mean
treatment or storage tanks, whether above ground or below ground, gas or oil
wells and associated piping transportation devices. "Hazardous Materials" shall
mean any substance which is defined as a hazardous waste, hazardous substance,
hazardous material, used oil, pollutant or contaminant under any federal, state
or local statute, regulation, rule or ordinance or amendments thereto including,
without limitation, the Comprehensive Environmental Response, Compensation and
Liability Act (42 U.S.C. Section 9601, et seq.); the Resource Conservation and
Recovery Act (42 U.S.C. Section 6901, et seq.); the Clean Air Act, as amended
(42 U.S.C. Section 7401, et seq.); the Federal Water Pollution Control Act, as
amended (33 U.S.C. Section 1251, et seq.); the Toxic Substances Control Act, as
amended (15 U.S.C. Section 9601, et seq.); the Occupational Safety and Health
Act, as amended (29 U.S.C. Section 651; the Emergency Planning and Community
Right-to-Know Act of 1986 (42 U.S.C. Section 11001, et seq.); the Safe Drinking
Water Act (42 U.S.C. Section 300f, et seq.); and all comparable state and local
laws, including without limitation, the Carpenter-Presley-Tanner Hazardous
Substance Account Act (State Superfund), the Porter-Cologne Water Quality
Control Act, Section 25140, 25501(j) and (k), 25501.1,25281 and 25250.1 of the
California Health and Safety Code and/or Article I of Title 22 of the California
Code of Regulations, Division 4, Chapter 30; laws of other jurisdictions or
orders and regulations; or the presence of which causes or threatens to cause a
nuisance, trespass or other common law tort upon real property or adjacent
properties or poses or threatens to pose a hazard to the health or safety of
persons or including without limitation, gasoline, diesel fuel or other
petroleum hydrocarbons; polychlorinated biphenyls (PCBs), asbestos or urea
formaldehyde foam insulation.

             4.12.3 ONB has provided to CVB phase I environmental assessments
with respect to each interest in real property set forth on the ONB Real
Property List as to which such a phase I environmental investigation has been
prepared by or on behalf of ONB or Orange. The ONB Real Property list shall
disclose each such property as to which such an assessment has not been prepared
on behalf of ONB or Orange.




<PAGE>   28


        4.13 Performance of Obligations. Each of ONB, Orange and Mortgage
Brokerage has performed in all material respects all of the obligations required
to be performed by it to date and is not in default under or in breach of any
term or provision of any covenant, contract, lease, indenture or any other
covenant to which it is a party, is subject or is otherwise bound, and no event
has occurred that, with the giving of notice or the passage of time or both,
would constitute such default or breach, where such default or breach would
have, individually or in the aggregate, a material adverse effect on the
business, financial condition, results of operations or prospects of ONB on a
consolidated basis. Except for loans and leases made by ONB, Orange or Mortgage
Brokerage in the ordinary course of business, to ONB's knowledge, no party is in
breach of a material agreement with ONB, Orange or Mortgage Brokerage which
breach has had or reasonably should be expected to have a material adverse
effect on the business, financial condition, results of operations or prospects
of ONB, Orange or Mortgage Brokerage.

        4.14 Employees. There are no controversies pending or threatened between
either ONB, Orange or Mortgage Brokerage and any of its employees that are
likely to have a material adverse effect on the business, financial condition,
results of operations or prospects of ONB on a consolidated basis. Neither ONB,
Orange nor Mortgage Brokerage is a party to any collective bargaining agreement
with respect to any of its employees or any labor organization to which its
employees or any of them belong.

        4.15 Brokers and Finders. Except for the obligation to First Security -
Van Kasper, pursuant to a letter dated October 16, 1998, a copy of which has
been furnished to CVB, neither ONB, Orange or Mortgage Brokerage is a party to
or obligated under any agreement with any broker or finder relating to the
transactions contemplated hereby, and neither the execution of this Agreement
nor the consummation of the transactions provided for herein will result in any
liability to any broker or finder.

        4.16 Material Contracts. Except as set forth in a list furnished by ONB
to CVB (the "ONB Contract List") hereto (all items listed or required to be
listed in such ONB Contract List being referred to herein as "Scheduled
Contracts"), neither ONB, Orange or Mortgage Brokerage is a party or otherwise
subject to:

             4.16.1 any employment, deferred compensation, bonus or consulting
contract that (i) has a remaining term, as of the date of this Agreement, of
more than one year in length of obligation on the part of ONB, Orange or
Mortgage Brokerage and is not terminable by ONB or Orange or Mortgage Brokerage
within one year without penalty or (ii) requires payment by ONB or Orange of
$25,000 or more per annum;

             4.16.2 any advertising, brokerage, licensing, dealership,
representative or agency relationship or contract requiring payment by ONB,
Orange or Mortgage Brokerage of $25,000 or more per annum;

             4.16.3 any contract or agreement that restricts ONB, Orange or
Mortgage Brokerage (or would restrict any Affiliate of ONB or Orange or the
Surviving Corporation or the Surviving Bank (including CVB and its subsidiaries)
after the Effective Time of the Merger and Effective Time of the Bank Merger)
from competing in any line of business with any Person or using or employing the
services of any Person;




<PAGE>   29


             4.16.4 any lease of real or personal property providing for annual
lease payments by or to ONB, Orange or Mortgage Brokerage in excess of $25,000
per annum other than (A) financing leases entered into in the ordinary course of
business in which ONB, Orange or Mortgage Brokerage is lessor and (B) leases of
real property presently used by Orange, Mortgage Brokerage as banking offices;

             4.16.5 any mortgage, pledge, conditional sales contract, security
agreement, option, or any other similar agreement with respect to any interest
of ONB, Orange or Mortgage Brokerage (other than as mortgagor or pledgor in the
ordinary course of its banking business or as mortgagee, secured party or deed
of trust beneficiary in the ordinary course of its business) in personal
property having a value of $25,000 or more;

             4.16.6 other than as described in the ONB Filings or as set forth
in the ONB Employee Plan List, any stock purchase, stock option, stock bonus,
stock ownership, profit sharing, group insurance, bonus, deferred compensation,
severance pay, pension, retirement, savings or other incentive, welfare or
employment plan or material agreement providing benefits to any present or
former employees, officers or directors of ONB, Orange or Mortgage Brokerage;

             4.16.7 any agreement to acquire equipment or any commitment to make
capital expenditures of $25,000 or more;

             4.16.8 other than agreements entered into in the ordinary course of
business, including sales of other real estate owned, any agreement for the sale
of any property or assets in which ONB, Orange or Mortgage Brokerage has an
ownership interest or for the grant of any preferential right to purchase any
such property or asset;

             4.16.9 any agreement for the borrowing of any money (other than
liabilities or interbank borrowings made in the ordinary course of its banking
business and reflected in the financial records of ONB or Orange);

             4.16.10 any restrictive covenant contained in any deed to or lease
of real property owned or leased by ONB, Orange or Mortgage Brokerage (as
lessee) that materially restricts the use, transferability or value of such
property;

             4.16.11 any guarantee or indemnification which involves the sum of
$25,000 or more, other than letters of credit or loan commitments issued in the
normal course of business;

             4.16.12 any supply, maintenance or landscape contracts not
terminable by ONB, Orange or Mortgage Brokerage without penalty on 30 days' or
less notice and which provides for payments in excess of $25,000 per annum;

             4.16.13 other than as disclosed with reference to Section 4.16.11
of this Section 4.16, any material agreement which would be terminable other
than by ONB, Orange or Mortgage Brokerage as a result of the consummation of the
transactions contemplated by this Agreement;




<PAGE>   30


             4.16.14 any contract of participation with any other bank in any
loan in excess of $25,000 or any sales of assets of ONB, Orange or Mortgage
Brokerage with recourse of any kind to ONB, Orange or Mortgage Brokerage except
the sale of mortgage loans, servicing rights, repurchase or reverse repurchase
agreements, securities or other financial transactions in the ordinary course of
business;

             4.16.15 any agreement providing for the sale or servicing of any
loan or other asset which constitutes a "recourse arrangement" under applicable
regulation or policy promulgated by a Governmental Entity (except for agreements
for the sale of guaranteed portions of loans guaranteed in part by the U. S.
Small Business Administration and related servicing agreements);

             4.16.16 any contract relating to the provision of data processing
services to ONB or Orange; or

             4.16.17 any other agreement of any other kind which involves future
payments or receipts or performances of services or delivery of items requiring
payment of $25,000 or more to or by ONB, Orange or Mortgage Brokerage other than
payments made under or pursuant to loan agreements, participation agreements and
other agreements for the extension of credit in the ordinary course of their
business.

             True copies of all Scheduled Contracts, including all amendments
and supplements thereto, have been delivered to CVB.

             4.17 Certain Material Changes. Except as specifically required,
permitted or effected by this Agreement, since December 31, 1998, there has not
been, occurred or arisen any of the following (whether or not in the ordinary
course of business unless otherwise indicated):

             4.17.1 Any change in any of the assets, liabilities, permits,
methods of accounting or accounting practices, business, or manner of conducting
business, of ONB, Orange or Mortgage Brokerage or any other event or development
that has had or may reasonably be expected to have, individually or in the
aggregate, a material adverse effect on the assets, liabilities, permits,
business, financial condition, results of operations or prospects of ONB on a
consolidated basis;

             4.17.2 Any damage, destruction or other casualty loss (whether or
not covered by insurance) that has had or may reasonably be expected to have a
material adverse effect on the assets, liabilities, business, financial
condition, results of operations or prospects of ONB on a consolidated basis or
that may involve a loss of more than $25,000 in excess of applicable insurance
coverage;

             4.17.3 Any amendment, modification or termination of any existing,
or entry into any new, material contract or permit that has had or may
reasonably be expected to have a material adverse effect on the assets,
liabilities, business, financial condition, results of operations or prospects
of ONB on a consolidated basis;

             4.17.4 Any disposition by ONB, Orange or Mortgage Brokerage of an
asset the lack of which has had or may reasonably be expected to have a material
adverse effect on the


<PAGE>   31

assets, liabilities, business, financial condition, results of operations or
prospects of ONB on a consolidated basis; or

             4.17.5 Any direct or indirect redemption, purchase or other
acquisition by ONB, Orange or Mortgage Brokerage of any equity securities or any
declaration, setting aside or payment of any dividend (except, in the case of
the declaration, setting aside or payment of a cash dividend, as disclosed in
the Financial Statements of ONB) or other distribution on or in respect of ONB
Stock whether consisting of money, other personal property, real property or
other things of value.

        4.18 Licenses and Permits. Each of ONB, Orange and Mortgage Brokerage
has all material licenses and permits that are necessary for the conduct of its
respective business, and such licenses are in full force and effect, except for
any failure to be in full force and effect that would not, individually or in
the aggregate, have a material adverse effect on the business, financial
condition, results of operations or prospects of ONB on a consolidated basis.
The respective properties, assets, operations and businesses of ONB and Orange
are and have been maintained and conducted, in all material respects, in
compliance with all applicable licenses and permits. The respective properties
and operations of ONB and Orange are and have been maintained and conducted, in
all material respects, in compliance with all applicable laws and regulations.

        4.19 Undisclosed Liabilities. Neither ONB, Orange or Mortgage Brokerage
has any liabilities or obligations, either accrued or contingent, that are
material to ONB and that have not been: (a) reflected or disclosed in the
Financial Statements of ONB; (b) incurred subsequent to December 31, 1998 in the
ordinary course of business consistent with past practices; or (c) disclosed in
a list furnished by ONB to CVB (the "Undisclosed Liabilities List") or on any
other ONB List. ONB does not know of any basis for the assertion against it or
Orange of any liability, obligation or claim (including, without limitation,
that of any regulatory authority) that is likely to result in or cause a
material adverse change in the business, financial condition, results of
operations or prospects of ONB on a consolidated basis that is not fairly
reflected in the Financial Statements of ONB or otherwise disclosed in this
Agreement.

        4.20 Employee Benefit Plans.

             4.20.1 ONB has previously made available to CVB copies of each
"employee benefit plan," as defined in Section 3(3) of ERISA, of which ONB or
any member of the same controlled group of corporations, trades or businesses as
ONB within the meaning of Section 4001(a)(14) of ERISA ("ERISA Affiliates") is a
sponsor or participating employer or as to which ONB or any of its ERISA
Affiliates makes contributions or is required to make contributions and which is
subject to any provision of ERISA and covers any employee, whether active or
retired, of ONB or any of its ERISA Affiliates, together with all amendments
thereto, all currently effective and related summary plan descriptions (to the
extent one is required by law), the determination letter from the IRS, the
annual reports for the most recent three years (Form 5500 including, if
applicable, Schedule B thereto) and the summary of material modifications
prepared in connection with any such plan. Such plans are hereinafter referred
to collectively as the "Employee Plans." ONB does not participate in an employee
benefit pension plan that is a "multiemployer plan" within the meaning of
Section 3(37) of ERISA that would subject ONB or




<PAGE>   32

any of its ERISA Affiliates to a material amount of liability with respect to
any such plan. No event has occurred that will subject such Employee Plans to a
material amount of tax under Section 511 of the Code. All amendments required to
bring each Employee Plan into conformity with all of the applicable provisions
of ERISA, the Code and all other applicable laws have been made, other than the
requirement to make amendments for which the regulatory remedial amendment
period has not expired. As disclosed in a list furnished by ONB to CVB of all of
ONB's Employee Plans, (the "ONB Employee Plan List"), all Employee Plans were in
effect for substantially all of 1998, and there has been no material amendment
thereof (other than amendments required to comply with applicable law) or
material increase in the cost thereof or benefits thereunder on or after January
1, 1998.

             4.20.2 ONB has previously made available to CVB copies or
descriptions of each plan or arrangement maintained or otherwise contributed to
by ONB or any of its ERISA Affiliates which is not an Employee Plan and which
(exclusive of base salary and base wages) provides for any form of current or
deferred compensation, bonus, stock option, stock awards, stock-based
compensation or other forms of incentive compensation or post-termination
insurance, profit sharing, retirement, group health or insurance, disability,
workers' compensation, welfare or similar plan or arrangement for the benefit of
any employee or class of employees, whether active or retired, of ONB or any of
its ERISA Affiliates (such plans and arrangements being collectively referred to
herein as "Benefit Arrangements"). As disclosed in the ONB Employee Plan List
hereto, which includes a list of all Benefit Arrangements, all Benefit
Arrangements which are in effect were in effect for substantially all of 1998
and there has been no material amendment thereof or material increase in the
cost thereof or benefits payable thereunder since January 1, 1998. Except as set
forth in the ONB Employee Plan List, there has been no material increase in the
compensation of or benefits payable to any senior executive employee of ONB
since December 31, 1998, nor any employment, severance or similar contract
entered into with any such employee, nor any material amendment to any such
contract, since December 31, 1998. There is no contract, agreement or benefit
arrangement covering any employee of ONB which individually or collectively
could give rise to the payment of any amount which would constitute an "excess
parachute payment," as such term is defined in Section 280G of the Code, or
would constitute compensation that is not deductible by reason of the limitation
set forth in Section 162(m) of the Code.

             4.20.3 With respect to all Employee Plans and Benefit Arrangements,
ONB and its ERISA Affiliates are in material compliance with their terms (other
than noncompliance the cost or liability for which is not material) with the
requirements prescribed by any and all statutes, governmental or court orders,
or governmental rules or regulations currently in effect, including but not
limited to ERISA and the Code, applicable to such plans or arrangements. All
material government reports and filings required by law have been properly and
timely filed and all information required to be distributed to participants or
beneficiaries has been distributed with respect to each Employee Plan. ONB and
its ERISA Affiliates have performed all of their obligations under all such
Employee Plans and Benefit Arrangements in all material aspects. There is no
pending or, to the knowledge of ONB, threatened legal action, proceeding or
investigation against or involving any Employee Plan or Benefit Arrangement
which could result in a material amount of liability of ONB or an ERISA
Affiliate to such Employee Plan. No condition exists that could constitute
grounds for the termination of any Employee Plan under Section 4042 of ERISA; no
"prohibited transaction," as defined in Section 406 of ERISA and




<PAGE>   33


Section 4975 of the Code, has occurred with respect to any Employee Plan, or any
other employee benefit plan maintained by ONB or any of its ERISA Affiliates
which is covered by Title I of ERISA, which could subject ONB directly or
indirectly responsible to a material amount of liability under Title I of ERISA
or to the imposition of a material amount of tax under Section 4975 of the Code
which could have a material adverse effect on the business, assets, financial
condition, results of operations or prospects of ONB on a consolidated basis;
nor has any Employee Plan subject to Part III of Subtitle B of Title I of ERISA
or Section 412 of the Code, or both, incurred any "accumulated funding
deficiency," as defined in Section 412 of the Code, whether or not waived, nor
has ONB failed to make any material contribution or pay any material amount due
and owing as required by the terms of any Employee Plan or Benefit Arrangement.
No "reportable event" as defined in ERISA, except reportable events for which
the 30-day notice requirement has been waived, has occurred with respect to any
of the Employee Plans. Neither ONB nor any of its ERISA Affiliates has not
incurred nor expects to incur, directly or indirectly, a material amount of
liability under Title IV or ERISA arising in connection with the termination of,
or a complete or partial withdrawal from, any plan covered or previously covered
by Title IV of ERISA which could constitute a liability of CVB or of any of its
Affiliates (including ONB and Orange) at or after the Effective Time of the
Merger.

             4.20.4 Neither ONB nor any of its ERISA Affiliates has provided or
is required to provide security to any Employee Plan pursuant to Section
401(a)(29) of the Code. Each of the Employee Plans which is intended to be a
qualified plan under Section 401(a) of the Code has received a favorable
determination letter from the Internal Revenue Service and neither ONB nor
Orange knows of any fact which could adversely affect the qualified status of
any such Employee Plan other than the requirement to make amendments for which
the regulatory remedial amendment period has not expired. The Financial
Statements of ONB properly reflect all amounts required to be accrued as
liabilities to date under each of the Employee Plans.

             4.20.5 Except for Scheduled Contracts set forth in the ONB Contract
List or as set forth in the ONB Employee Plan List, as the case may be, each
Employee Plan or Benefit Arrangement and each personal services contract, fringe
benefit, consulting contract or similar arrangement with or for the benefit of
any officer, director, employee or other person can be terminated by ONB within
a period of 30 days following the Effective Time of the Merger, without payment
of any amount as a penalty, bonus, premium, severance pay or other compensation
for such termination.

             4.20.6 All group health plans of ONB have been operated in
compliance with the group health plan continuation coverage requirements of
Section 4980B of the Code in all material respects.

             4.20.7 Neither ONB nor Orange utilizes or has utilized the services
of workers (including workers provided by third parties, independent contractors
and temporary employees) who might reasonably be classified as employees (or
permanent employees) of either, such that, were such employees so reclassified,
it could reasonably be expected to result in the disqualification of any of the
Employee Plans or result in the imposition of material penalties or excise taxes
by the IRS, the Department of Labor, the Pension Benefit Guaranty Corporation or
any other Governmental Entity. Neither ONB nor Orange utilized or has utilized
the services of



<PAGE>   34


leased employees under circumstances that might reasonably result in such a
disqualification or imposition of material penalties or excise taxes.

             4.20.8 Except as set forth in the ONB Employee Plan List, with
respect to each Employee Plan that is funded wholly or partially through an
insurance policy, neither ONB or Orange has been notified that there will be
liability of ONB or Orange, as of the Closing Date, under any such insurance
policy or ancillary agreement with respect to such insurance policy in the
nature of a retroactive rate adjustment, loss sharing arrangement or other
actual or contingent liability arising wholly or partially out of events
occurring prior to the Closing Date.

        4.21 Corporate Records. The minute books of each of ONB, Orange and
Mortgage Brokerage accurately reflect all material actions taken by the
respective shareholders, board of directors and committees of each of ONB,
Orange and Mortgage Brokerage.

        4.22 Accounting Records. Each of ONB, Orange and Mortgage Brokerage
maintain accounting records which fairly and validly reflect, in all material
respects, its transactions and accounting controls exist sufficient to provide
reasonable assurances that such transactions are, in all material respects, (i)
executed in accordance with its management's general or specific authorization,
and (ii) recorded as necessary to permit the preparation of financial statements
in conformity with generally accepted accounting procedures. Such records, to
the extent they contain important information pertaining to ONB, Orange and
Mortgage Brokerage which is not easily and readily available elsewhere, have
been duplicated, and such duplicates are stored safely and securely.

        4.23 Offices and ATMs. ONB has furnished to CVB a list (the "ONB Offices
List") setting forth the headquarters of each of ONB, Orange and Mortgage
Brokerage (identified as such) and each of the offices and automated teller
machines ("ATMs") maintained and operated by ONB or Orange (including, without
limitation, representative and loan production offices and operations centers)
and the location thereof. Except as set forth on the ONB Offices List, neither
ONB, Orange or Mortgage Brokerage maintains any other office or ATM or conducts
business at any other location, and neither ONB, Orange or Mortgage Brokerage
has applied for or received permission to open any additional branch or operate
at any other location.

        4.24 Operating Losses. ONB has furnished to CVB a list (the "ONB
Operating Losses List") setting forth any Operating Loss (as herein defined)
which has occurred at ONB during the period after December 31, 1998 to the date
of the Agreement. No action has been taken or omitted to be taken by any
employee of ONB that has resulted in the incurrence by ONB of an Operating Loss
or that might reasonably be expected to result in the incurrence of any
individual Operating Loss which, net of any insurance proceeds payable in
respect thereof, would exceed $25,000 on an individual basis or in the
aggregate. For purposes of this section "Operating Loss" means any loss
resulting from cash shortages, lost or misposted items, disputed clerical and
accounting errors, forged checks, payment of checks over stop payment orders,
counterfeit money, wire transfers made in error, theft, robberies, defalcations,
check kiting, fraudulent use of credit cards or ATMs, civil money penalties,
fines, litigation or claims.

        4.25 Loan Portfolio. ONB has furnished to CVB a list (the "ONB Loan
List") that sets forth as of April 30, 1999, a description of, (a) by type and
classification, if any, each loan, lease,



<PAGE>   35

other extension of credit or commitment to extend credit by ONB, Orange or
Mortgage Brokerage; (b) by type and classification, all loans, leases, other
extensions and commitments to extend credit of ONB, Orange or Mortgage Brokerage
that have been classified by its bank examiners or auditors (external or
internal) as "Watch List," "Substandard," "Doubtful," "Loss" or any comparable
classification; and (c) all consumer loans due to ONB, Orange or Mortgage
Brokerage as to which any payment of principal, interest or any other amount is
90 days or more past due.

        4.26 Investment Securities. ONB has furnished to CVB a list (the "ONB
Investment Securities List") setting forth a description of each Investment
Security held by ONB, Orange or Mortgage Brokerage on April 30, 1999. The ONB
Investment Securities List sets forth, with respect to each such Investment
Security: (i) the issuer thereof; (ii) the outstanding balance or number of
shares; (iii) the maturity, if applicable; (iv) the title of issue; and (v) the
classification under SFAS No. 115. Neither ONB nor Orange has any Investment
Security classified as trading.

        4.27 Power of Attorney. Neither ONB, Orange or Mortgage Brokerage has
granted any Person a power of attorney or similar authorization that is
presently in effect or outstanding.

        4.28 Facts Affecting Regulatory Approvals. To the best knowledge of ONB,
there is no fact, event or condition applicable to ONB, Orange or Mortgage
Brokerage which will, or reasonably could be expected to, adversely affect the
likelihood of securing the requisite approvals or consents of any Governmental
Entity to the Merger, the Bank Merger and the transactions contemplated by this
Agreement.

        4.29 Accounting and Tax Matters. Neither ONB, Orange or Mortgage
Brokerage has through the date hereof taken or agreed to take any action that
would prevent CVB from accounting for the business combination to be effected by
the Merger and the Bank Merger as a pooling-of-interests or would prevent the
Merger and the Bank Merger from qualifying as a tax-free reorganization under
the Code.

        4.30 Indemnification. Other than pursuant to the provisions of their
respective Articles of Incorporation or Bylaws, neither ONB, Orange or Mortgage
Brokerage is a party to any indemnification agreement with any of its present
officers, directors, employees, agents or other persons who serve or served in
any other capacity with any other enterprise at the request of ONB or Orange (a
"Covered Person"), and to the best knowledge of ONB, there are no claims for
which any Covered Person would be entitled to indemnification by ONB, Orange or
Mortgage Brokerage if such provisions were deemed in effect, except as set forth
in a list furnished by ONB to CVB (the "ONB Indemnification List").

        4.31 Community Reinvestment Act. Orange has received a rating of
"Satisfactory" in its most recent Community Reinvestment Act examination. Orange
has not been advised of any supervisory concerns regarding its or ONB's
compliance with the Community Reinvestment Act.

        4.32 Derivative Transactions. Except as set forth in a list furnished by
ONB to CVB (the "ONB Derivatives List"), neither ONB, Orange or Mortgage
Brokerage is a party to or has agreed to enter into an exchange traded or
over-the-counter equity, interest rate, foreign



<PAGE>   36


exchange or other swap, forward, future, option, cap, floor or collar or any
other contract that is not included on the balance sheet and is a derivative
contract (including various combinations thereof) or owns securities that are
referred to generically as "structured notes," "high risk mortgage derivatives,"
"capped floating rate notes," or "capped floating rate mortgage derivatives."

        4.33 Trust Administration. Orange does not presently exercise trust
powers, including, but not limited to, trust administration, and neither it nor
any predecessor has exercised such trust powers for a period of at least three
years prior to the date hereof. The term "trusts" as used in this Section 4.33
includes (i) any and all common law or other trusts between an individual,
corporation or other entities and Orange or a predecessor, as trustee or
co-trustee, including, without limitation, pension or other qualified or
nonqualified employee benefit plans, compensation, testamentary, inter vivos,
and charitable trust indentures; (ii) any and all decedents' estates where
Orange or a predecessor is serving or has served as a co-executor or sole
executor, personal representative or administrator, administrator de bonis non,
administrator de bonis non with will annexed, or in any similar fiduciary
capacity; (iii) any and all guardianships, conservatorships or similar positions
where Orange or a predecessor is serving or has served as a co-grantor or a sole
grantor or a conservator or co-conservator of the estate, or any similar
fiduciary capacity; and (iv) any and all agency and/or custodial accounts and/or
similar arrangements, including plan administrator for employee benefit
accounts, under which Orange or a predecessor is serving or has served as an
agent or custodian for the owner or other party establishing the account with or
without investment authority.

        4.34 Disclosure Documents and Applications. None of the information
supplied or to be supplied by or on behalf of ONB ("ONB Supplied Information")
for inclusion in (a) the Registration Statement on Form S-4 and the Proxy
Statement and Prospectus to be mailed to the shareholders of ONB and CVB in
connection with obtaining the approval of the shareholders of ONB and CVB of
this Agreement, as required and (b) any other documents to be filed with the
SEC, the FRB, the FDIC, the DFI or any other Governmental Entity in connection
with the transactions contemplated in this Agreement, will, at the respective
times such documents are filed or become effective, or with respect to the Proxy
Statement and Prospectus when mailed, contain any untrue statement of a material
fact, or omit to state any material fact required to be stated therein or
necessary in order to make the statements therein, in light of the circumstances
under which they were made, not misleading.

        4.35 Intellectual Property. Except as set forth in a list furnished by
ONB to CVB (the "ONB Intellectual Property List"), ONB, Orange and Mortgage
Brokerage own or possess valid and binding licenses and other rights to use
without payment all material patents, copyrights, trade secrets, trade names,
service marks and trademarks used in their respective businesses; and neither
ONB, Orange or Mortgage Brokerage has received any notice with respect thereto
that asserts the rights of others. ONB, Orange and Mortgage Brokerage have in
all material respects performed all the obligations required to be performed by
them, and are not in default in any material respect under any license,
contract, agreement, arrangement or commitment relating to any of the foregoing.

        4.36 Year 2000. The mission critical computer software operated by ONB
and Orange is currently capable of providing, or is being adapted to provide,
uninterrupted millennium



<PAGE>   37


functionality to record, store, process and present calendar dates falling on or
after January 1, 2000 in substantially the same manner and with the same
functionality as such mission critical software records, stores, processes and
presents such calendar dates falling on or before December 31, 1999. The costs
of the adaptations referred to in this clause will not have a material adverse
effect on the business, financial condition, results of operations or prospects
of ONB on a consolidated basis. Neither ONB nor Orange has received, or
reasonably expects to receive, a "Year 2000 Deficiency Notification Letter" (as
such term is employed by the FDIC). ONB has disclosed to CVB a complete and
accurate copy of its plan, including an estimate of the anticipated associated
costs, for addressing the issues set forth in all Federal Financial Institutions
Examination Council Interagency Statements as such issues affect ONB and Orange.
Between the date of this Agreement and the Effective Time, ONB shall use
commercially practicable efforts to implement such plan.

        4.37 Insider Loans; Other Transactions. ONB has previously provided CVB
with a listing, current as of April 30, 1999, of all extensions of credit made
by ONB, Orange and Mortgage Brokerage to each of its executive officers and
directors and their related interests (all as defined under Federal Reserve
Board Regulation O), all of which have been made in compliance with Regulation
O, and Section 23B under the Federal Reserve Act which listing is true, correct
and complete in all material respects. Neither ONB, Orange or Mortgage Brokerage
owes any amount to, or has any contract or lease with or commitment to, any of
the present executive officers or directors of ONB, Orange or Mortgage Brokerage
(other than for compensation for current services not yet due and payable,
reimbursement of expenses arising in the ordinary course of business, options or
awards available under the ONB Stock Option Plan or any amounts due pursuant to
ONB's Employee Plans).

        4.38 Registration Obligation. Neither ONB, Orange or Mortgage Brokerage
is under any obligation, contingent or otherwise, to register any of their
respective securities under the Securities Act or rules and regulation of the
OCC.

        4.39 SBA Lending. Orange is a [certified preferred lender] with respect
to the Small Business Administration and maintains a program for lending with
the Small Business Administration.

        4.40 Accuracy and Currentness of Information Furnished. The
representations and warranties made by ONB hereby or in the ONB Lists or
schedules hereto do not contain any untrue statement of a material fact or omit
to state any material fact which is necessary under the circumstances under
which they were made to prevent the statements contained herein or in such
schedules from being misleading.


                                   ARTICLE 5.

                      REPRESENTATIONS AND WARRANTIES OF CVB

            CVB represents and warrants to ONB as follows:

        5.1 Incorporation, Standing and Power. CVB has been duly organized, is
validly existing and in good standing as a corporation under the laws of the
State of California and is



<PAGE>   38

registered as a bank holding company under the BHC Act. CBB is a California
state chartered bank duly organized, validly existing and in good standing under
the laws of the State of California and is authorized by the DFI to conduct a
general banking business. CBB's deposits are insured by the FDIC in the manner
and to the fullest extent provided by law. Each of CVB and CBB has all requisite
corporate power and authority to own, lease and operate their respective
properties and assets and to carry on their businesses as presently conducted.
CVB and CBB are duly qualified and in good standing as foreign corporations, and
are authorized to do business, in all states or other jurisdictions in which
such qualification or authorization is necessary, except where the failure to be
so qualified or authorized would not, individually or in the aggregate, have a
material adverse effect on the business, financial condition, results of
operations or prospects of CVB and CBB on a consolidated basis. True and correct
copies of the Articles of Incorporation and Bylaws of CVB and CBB have been
delivered to ONB. Such Articles of Incorporation and Bylaws are in full force
and effect as of the date hereof.

        5.2 Capitalization. As of the date of this Agreement, the authorized
capital stock of CVB consists of 50,000,000 shares of common stock, no par
value, of which 16,563,771 shares are outstanding and 20,000,000 shares of
preferred stock, no par value, of which no shares are outstanding. All of the
outstanding shares of CVB Stock are duly authorized, validly issued, fully paid
and nonassessable. The CVB Stock to be used in the Merger will be duly
authorized, validly issued, fully paid and nonassessable.

        5.3 Financial Statements. CVB has previously furnished to ONB a copy of
the Financial Statements of CVB. The Financial Statements of CVB: (a) present
fairly the consolidated financial condition of CVB as of the respective dates
indicated and its consolidated results of operations and statements of cash
flows, as applicable, for the respective periods then ended, subject, in the
case of the unaudited consolidated interim financial statements, to normal
recurring adjustments; (b) have been prepared in accordance with generally
accepted accounting principles and/or applicable regulatory accounting
principles or banking regulations consistently applied (except as otherwise
indicated therein); and (c) are based upon the books and records of CVB and its
subsidiaries.

        5.4 Reports and Filings. Since January 1, 1996, CVB has filed all
reports, returns, registrations and statements (such reports and filings
referred to as "CVB Filings"), together with any amendments required to be made
with respect thereto, that were required to be filed with (a) the SEC, (b) the
FRB, and (c) any other applicable Governmental Entity, including taxing
authorities, except where the failure to file such reports, returns,
registrations or statements has not had and is not reasonably expected to have a
material adverse effect on the business, financial condition, results of
operations or prospects of CVB on a consolidated basis. No administrative
actions have been taken or orders issued in connection with such CVB Filings. As
of their respective dates, each of such CVB Filings (y) complied in all material
respects with all laws and regulations enforced or promulgated by the
Governmental Entity with which it was filed (or was amended so as to be in such
compliance promptly following discovery of any such noncompliance); and (z) did
not contain any untrue statement of a material fact or omit to state a material
fact required to be stated therein or necessary to make the statements therein,
in light of the circumstances under which they were made, not misleading. Any
financial statement contained in any of such CVB Filings that was intended to
present the financial position of CVB on a consolidated basis fairly presented
the financial position of CVB on a consolidated basis




<PAGE>   39

and was prepared in accordance with generally accepted accounting principles or
banking regulations consistently applied, except as stated therein, during the
periods involved and except (other than for those financial statements filed
with the SEC), where any misstatement or omission would not make the statements
therein, in light of the circumstances under which they were made, misleading.

        5.5 Authority. The execution and delivery by CVB of this Agreement and
the Agreement of Merger and by CBB of the Agreement of Bank Merger, subject to
the required approval of the shareholders of CVB of this Agreement and the
transactions contemplated hereby, and the consummation of the transactions
contemplated hereby and thereby have been duly and validly authorized by all
necessary corporate action on the part of CVB and CBB, as appropriate. This
Agreement is, and the Agreement of Merger and the Agreement of Bank Merger will
be, upon due execution and delivery by the respective parties thereto, valid and
binding obligations of CVB and CBB, as the case may be, enforceable in
accordance with their respective terms, except as the enforceability thereof may
be limited by bankruptcy, liquidation, receivership, conservatorship,
insolvency, moratorium or other similar laws affecting the rights of creditors
generally and by general equitable principles. Except as set forth in a list
furnished by CVB to ONB (the "CVB Conflicts and Consents List"), neither the
execution and delivery by CVB of this Agreement or the Agreement of Merger or by
CBB of the Agreement of Bank Merger, the consummation of the transactions
contemplated herein, nor compliance by CVB or CBB with any of the provisions
hereof or thereof, will: (a) conflict with or result in a breach of any
provision of their respective Articles of Incorporation, as amended, or Bylaws,
as amended; (b) constitute a breach of or result in a default (or give rise to
any rights of termination, cancellation or acceleration, or any right to acquire
any securities or assets) under any of the terms, conditions or provisions of
any note, bond, mortgage, indenture, franchise, license, permit, agreement or
other instrument or obligation to which CVB or any subsidiary of CVB is a party,
or by which CVB or any subsidiary of CVB or any of their respective properties
or assets is bound; (c) result in the creation or imposition of any Encumbrance
on any of the properties or assets of CVB or any subsidiary; or (d) violate any
order, writ, injunction, decree, statute, rule or regulation applicable to CVB
or any subsidiary of CVB or any of their respective properties or assets. Except
as set forth in the "CVB Conflicts and Consents List," no consent of, approval
of, notice to or filing with any Governmental Entity having jurisdiction over
any aspect of the business or assets of CVB or CBB, and no consent of, approval
of or notice to any other Person, is required in connection with the execution
and delivery by CVB of this Agreement or the Agreement of Merger, or the
consummation by CVB of the Merger or the transactions contemplated hereby or
thereby, or by CBB of the Agreement of Bank Merger and the transactions
contemplated thereby, except (i) such approvals as may be required by the SEC,
the FRB, FDIC and the DFI; (ii) the approval of the shareholders of CVB, if
required; (iii) filing of the Agreement of Merger with the Secretary of State of
the State of California and the Agreement of Bank Merger with the Secretary of
State and the Commissioner; and (iv) such approvals as may be required to
approve for inclusion on AMEX of the CVB Stock to be issued in the Merger.

        5.6 Subsidiaries. As of the date of this Agreement, CVB owns all of the
outstanding stock of CBB. As of the date of this Agreement, and except for its
investments in CBB, Chino Valley Bancorp, Community Trust Deed Services, and CVB
Ventures, Inc., CVB does not own, directly or indirectly (except as a pledgee
pursuant to loans or upon acquisition in satisfaction of



<PAGE>   40

debt previously contracted), the outstanding stock or equity or other voting
interest in any other Person. CBB is the only subsidiary material to the
business or financial condition of CVB on a consolidated basis.

        5.7 Brokers and Finders. CVB is not a party to or obligated under any
agreement with any broker or finder relating to the transactions contemplated
hereby, and neither the execution of this Agreement nor the consummation of the
transactions provided for herein will result in any liability to any broker or
finder.

        5.8 Insurance. Each of CVB and CBB have policies of insurance and bonds
with respect to their respective assets and business against such casualties and
contingencies and in such amounts, types and forms as are customarily
appropriate. All such insurance policies and bonds are in full force and effect.

        5.9 Certain Material Changes. Except as specifically required, permitted
or effected by this Agreement or as disclosed in any CVB Filings, since December
31, 1998, there has not been, occurred or arisen any of the following (whether
or not in the ordinary course of business unless otherwise indicated):

            5.9.1 Any change in any of the assets, liabilities, permits, methods
of accounting or accounting practices, business, or manner or conducting
business, of CVB or its subsidiaries or any other event or development that has
had or may reasonably be expected to have a material adverse effect on the
assets, liabilities, permits, business, financial condition, results of
operations or prospects of CVB on a consolidated basis;

            5.9.2 Any damage, destruction or other casualty loss (whether or not
covered by insurance) that has had or may reasonably be expected to have a
material adverse effect on the assets, liabilities, permits, business, financial
condition, results of operations or prospects of CVB on a consolidated basis;

            5.9.3 Any amendment, modification or termination of any existing, or
entry into any new, material contract or permit that has had or may reasonably
be expected to have a material adverse effect on the assets, liabilities,
permits, business, financial condition, results of operations or prospects of
CVB on a consolidated basis; or

            5.9.4 Any disposition by CVB of an asset the lack of which has had
or may reasonably be expected to have a material adverse effect on the assets,
liabilities, permits, business, financial condition, results of operations or
prospects of CVB on a consolidated basis.

       5.10 Licenses and Permits. CVB and CBB have all material licenses and
permits that are necessary for the conduct of their respective businesses, and
such licenses are in full force and effect, except for any failure to be in full
force and effect that would not, individually or in the aggregate, have a
material adverse effect on the business, financial condition, results of
operations or prospects of CVB on a consolidated basis. The properties, assets,
operations and businesses of CVB and CBB are and have been maintained and
conducted, in all material respects, in compliance with all applicable licenses
and permits. The properties and operations of CVB and CBB are and have been
maintained and conducted, in all material respects, in compliance with all
applicable laws and regulations.




<PAGE>   41

        5.11 Compliance with Laws and Regulations. Neither CVB or CBB is in
default under or in breach or violation of (i) any provision of its respective
Articles or Incorporation, as amended, or Bylaws, as amended, or (ii) law, rule
or regulation promulgated by any Governmental Entity, except, with respect to
clause (ii) for such defaults, breaches or violations as would not have,
individually or in the aggregate, a material adverse effect on the business,
financial condition, results of operations or prospects of CVB on a consolidated
basis.

        5.12 Corporate Records. The minute books of CVB and CBB reflect all
material actions taken to this date by its respective shareholders, boards of
directors and committees.

        5.13 Accounting Records. CVB and CBB maintain accounting records which
fairly and validly reflect, in all material respects, their transactions and
accounting controls exist sufficient to provide reasonable assurances that such
transactions are, in all material respects, (i) executed in accordance with
their management's general or specific authorization, and (ii) recorded as
necessary to permit the preparation of financial statements in conformity with
generally accepted accounting procedures. Such records, to the extent they
contain important information pertaining to CVB and CBB. which is not easily and
readily available elsewhere, have been duplicated, and such duplicates are
stored safely and securely.

        5.14 Facts Affecting Regulatory Approvals. To the best knowledge of CVB,
there is no fact, event or condition applicable to CVB or any of its
subsidiaries which will, or reasonably could be expected to, adversely affect
the likelihood of securing the requisite approvals or consents of any
Governmental Entity to the Merger, the Bank Merger and the transactions
contemplated by this Agreement.

        5.15 Accounting and Tax Matters. CVB and CBB have not through the date
hereof taken or agreed to take any action that would prevent it from accounting
for the business combination to be effected by the Merger and the Bank Merger as
a pooling-of-interests or would prevent the Merger and the Bank Merger from
qualifying as a tax-free reorganization under the Code.

        5.16 Disclosure Documents and Applications. None of the information
supplied or to be supplied by or on behalf of CVB or any of its subsidiaries
("CVB Supplied Information") for inclusion in (a) the Registration Statement on
Form S-4 and the Proxy Statement and Prospectus to be mailed to the shareholders
of ONB and CVB in connection with obtaining the approval of the shareholders of
ONB and CVB of this Agreement, the Merger and the other transactions
contemplated hereby, and (b) any other documents to be filed with the SEC, the
FRB, the FDIC, the DFI or any other Governmental Entity in connection with the
transactions contemplated in this Agreement, will, at the respective times such
documents are filed or become effective, or with respect to the Proxy Statement
and Prospectus when mailed, contain any untrue statement of a material fact, or
omit to state any material fact required to be stated therein or necessary in
order to make the statements therein, in light of the circumstances under which
they were made, not misleading.

        5.17 AMEX Listing. As of the date hereof, CVB Stock is listed on the
American Stock Exchange. CVB has taken no action to delist CVB Stock and, to the
best of CVB's




<PAGE>   42


knowledge, there are no existing orders nor pending investigations by a
Governmental Entity or any stock exchange which might lead to the delisting of
CVB Stock.

        5.18 Employees. There are no controversies pending or threatened between
either CVB or CBB and any of its employees that are likely to have a material
adverse effect on the business, financial condition, results of operations or
prospects of CVB on a consolidated basis. Neither CVB nor CBB is a party to any
collective bargaining agreement with respect to any of its employees or any
labor organization to which its employees or any of them belong.

        5.19 Year 2000. The mission-critical computer software operated by CVB
and CBB is currently capable of providing, or is being adapted to provide,
uninterrupted millennium functionality to record, store, process and present
calendar dates falling on or after January 1, 2000 in substantially the same
manner and with the same functionality as such mission critical software
records, stores, processes and presents such calendar dates falling on or before
December 31, 1999. The costs of the adaptations referred to in this clause will
not have a material adverse effect on the business, financial condition, results
of operations or prospects of CVB on a consolidated basis. CVB has not received,
and reasonably expects that it will not receive, a "Year 2000 Deficiency
Notification Letter" (as such term is employed by the FDIC).

        5.20 Litigation. Except as set forth in a list furnished by CVB to ONB
(the "CVB Litigation List") there is no private or governmental suit, claim,
action or proceeding pending, nor to CVB's knowledge threatened, against CVB or
CBB or against any of their respective directors, officers or employees relating
to the performance of their duties in such capacities or against or affecting
any properties of CVB or CBB which, if adversely determined, would have,
individually or in the aggregate, a material adverse effect upon the business,
financial condition or results of operations of CVB on a consolidated basis, or
which may involve a judgment against CVB or CBB in excess of $250,000. Also,
except as disclosed in the CVB Litigation List, there are no material judgments,
decrees, stipulations or orders against CVB or CBB in respect of, or the effect
of which is to prohibit, any business practice or the acquisition of any
property or the conduct of business in any area.

        5.21 Taxes. Except as set forth in a list furnished by CVB to ONB (the
"CVB Tax List"), (A) all material Tax Returns required to be filed by or on
behalf of CVB or CBB, have been duly and timely filed with the appropriate
taxing authorities in all jurisdictions in which such Tax Returns are required
to be filed (after giving effect to any valid extensions of time in which to
make such filings), and all such Tax Returns were true, complete and correct in
all material respects; (B) all Taxes due and payable by or on behalf of CVB, CBB
or any of their subsidiaries, either directly, as part of an Affiliated Group
Tax Return, or otherwise, have been fully and timely paid, except to the extent
adequately reserved therefor in accordance with generally accepted accounting
principles and/or applicable regulatory accounting principles or banking
regulations consistently applied on the CVB balance sheet, and adequate reserves
or accruals for Taxes have been provided in the CVB balance sheet with respect
to any period through the date thereof for which Tax Returns have not yet been
filed or for which Taxes are not yet due and owing; and (C) no agreement, waiver
or other document or arrangement extending or having the effect of extending the
period for assessment or collection of Taxes (including, but not limited to, any
applicable statute of limitation) has been executed or filed with



<PAGE>   43

any taxing authority by or on behalf of CVB, CBB or any of their subsidiaries,
or any Affiliated Group(s) of which any of them is or was a member.

        5.22 Performance of Obligations. Each of CVB and CBB has performed in
all material respects all of the obligations required to be performed by it to
date and is not in default under or in breach of any term or provision of any
covenant, contract, lease, indenture or any other covenant to which it is a
party, is subject or is otherwise bound, and no event has occurred that, with
the giving of notice or the passage of time or both, would constitute such
default or breach, where such default or breach would have, individually or in
the aggregate, a material adverse effect on the business, financial condition,
results of operations or prospects of CVB on a consolidated basis.

        5.23 Employee Benefit Plans. CVB has previously made available to ONB
copies of each "employee benefit plan," as defined in Section 3(3) of ERISA, of
which CVB or any member of the same controlled group of corporations, trades or
businesses as CVB within the meaning of Section 4001(a)(14) of ERISA ("ERISA
Affiliates") is a sponsor or participating employer or as to which CVB or any of
its ERISA Affiliates makes contributions or is required to make contributions
and which is subject to any provision of ERISA and covers any employee, whether
active or retired, of CVB or any of its ERISA Affiliates, together with all
amendments thereto, all currently effective and related summary plan description
(to the extent one is required by law), the determination letter from the IRS,
the annual reports for the most recent three years (Form 5500 including, if
applicable, Schedule B thereto) and the summary of material modifications
prepared in connection with any such plan. Such plans are hereinafter referred
to collectively as the "Employee Plans." CVB does not participate in an employee
benefit pension plan that is a "multiemployer plan" within the meaning of
Section 3(37) of ERISA that would subject CVB or any of its ERISA Affiliates to
a material amount of withdrawal liability upon withdrawal from any such plan. No
event has occurred that will subject such Employee Plans to a material amount of
tax under Section 511 of the Code. All amendments required to bring each
Employee Plan into conformity with all of the applicable provisions of ERISA,
the Code and all other applicable laws have been made other than to make
amendments for which the regulatory remedial amendment period has not expired.
As disclosed in a list furnished by CVB to ONB (the "CVB Employee Plan List"),
all Employee Plans were in effect for substantially all of 1998, and there has
been no material amendment thereof (other than amendments required to comply
with applicable law) or material increase in the cost thereof or benefits
thereunder on or after January 1, 1998.

             With respect to all Employee Plans and Benefit Arrangements, CVB
and its ERISA Affiliates are in material compliance with their terms and (other
than noncompliance the cost or liability of which is not material) with the
requirements prescribed by any and all statutes, governmental or court orders,
or governmental rules or regulations currently in effect, including but not
limited to ERISA and the Code, applicable to such plans or arrangements. Each of
the Employee Plans which is intended to be a qualified plan under Section 401(a)
of the Code has received a favorable determination letter from the Internal
Revenue Service and neither CVB nor CBB knows of any fact which could adversely
affect the qualified status of any such Employee Plan other than the requirement
to make amendments for which the regulatory remedial amendment period has not
expired.




<PAGE>   44

        5.24 Community Reinvestment Act. CBB has received a rating of
"Satisfactory" in its most recent examination with respect to the Community
Reinvestment Act. CBB has not been advised of any supervisory concerns regarding
CBB's compliance with the Community Reinvestment Act.

        5.25 Derivative Transactions. Except as set forth in a list furnished by
CVB to ONB (the "CVB Derivatives List"), neither CVB or CBB is a party to or has
agreed to enter into an exchange traded or over-the-counter equity, interest
rate foreign exchange or other swap, forward, future, option, cap, floor or
collar or any other contract that is not included on the balance sheet and is a
derivative contract (including various combinations thereof) or owns securities
that are referred to generically as "structured notes," "high risk mortgage
derivatives," "capped floating rate notes," or "capped floating rate mortgage
derivatives."

        5.26 Intellectual Property. Except as set forth in a list furnished by
CVB to ONB (the "CVB Intellectual Property List"), CVB and CBB own or possess
valid and binding licenses and other rights to use without payment all material
patents, copyrights, trade secrets, trade names, service marks and trademarks
used in their respective businesses, and neither CVB nor CBB has received any
notice with respect thereto that asserts the rights of others. CVB and CBB have
in all material respects performed all the obligations required to be performed
by them, and are not in default in any material respect under any license,
contract, agreement, arrangement or commitment relating to any of the foregoing.

        5.27 Accuracy and Currentness of Information Furnished. The
representations and warranties made by CVB hereby or in the CVB Lists or
Schedules hereto do not contain any untrue statement of material fact or omit to
state any material fact which is necessary under the circumstances under which
they were made to prevent the statements contained herein or in such schedules
from being misleading.


                                   ARTICLE 6.

              COVENANTS OF ONB PENDING EFFECTIVE TIME OF THE MERGER

            ONB covenants and agrees with CVB as follows:

        6.1 Limitation on Conduct Prior to Effective Time of the Merger. Between
the date hereof and the Effective Time of the Merger, except as contemplated by
this Agreement and subject to requirements of law and regulation, ONB agrees to
conduct its business (and to cause Orange and Mortgage Brokerage to conduct
their respective businesses) in the ordinary course in substantially the manner
heretofore conducted and in accordance with sound banking practices, and ONB,
Orange and Mortgage Brokerage shall not, without the prior written consent of
CVB, which consent shall not be unreasonably withheld:

            6.1.1 issue, sell or grant any ONB Stock (except pursuant to the
exercise of ONB Options outstanding as of the date hereof), any other securities
(including long-term debt) of ONB, Orange or Mortgage Brokerage, or any rights,
stock appreciation rights, options or securities to acquire any ONB Stock, or
any other securities (including long-term debt) of ONB, Orange or Mortgage
Brokerage;




<PAGE>   45

            6.1.2 declare, set aside or pay any dividend or make any other
distribution upon or split, combine or reclassify any shares of capital stock or
other securities of ONB, Orange or Mortgage Brokerage, provided, however, that
subject to Section 6.11, ONB may pay to its shareholders between the date hereof
and the Effective Time of Merger one cash dividend for each fiscal quarter
commencing with the quarter beginning July 1, 1999 in an amount which shall not
exceed $0.15 per share and in a manner and with a record date and payment date
consistent with past practices;

            6.1.3 purchase, redeem or otherwise acquire any capital stock or
other securities of ONB, Orange or Mortgage Brokerage or any rights, options, or
securities to acquire any capital stock or other securities of ONB, Orange or
Mortgage Brokerage;

            6.1.4 except as may be required to effect the transactions
contemplated herein, amend its Articles of Incorporation, Articles of
Association or Bylaws;

            6.1.5 grant any general or uniform increase in the rate of pay of
employees or employee benefits, except in the ordinary course of business
consistent with past practice, provided, however, that nothing herein shall be
construed to prevent the payment in cash, and in a manner and amount consistent
with past practice, of directors' fees for services provided in the normal and
ordinary course of business;

            6.1.6 grant any increase in salary, incentive compensation or
employee benefits or pay any bonus to any Person except in the ordinary course
of business consistent with past practice, and pursuant to any written
contractual obligations as of the date hereof, or voluntarily accelerate the
vesting of any employee benefits, and except as provided in Article XII of this
Agreement;

            6.1.7 make any capital expenditure or commitments with respect
thereto in excess of $25,000 in the aggregate, except for ordinary repairs,
renewals and replacements;

            6.1.8 compromise or otherwise settle or adjust any assertion or
claim of a deficiency in taxes (or interest thereon or penalties in connection
therewith), extend the statute of limitations with any tax authority or file any
pleading in court in any tax litigation or any appeal from an asserted
deficiency, or file or amend any federal, foreign, state or local tax return, or
make any tax election;

            6.1.9 grant, renew or commit to grant or renew any extension of
credit if such extension of credit, together with all other credit then
outstanding to the same Person and all Affiliated Persons, would exceed the
greater of $100,000 or Orange's individual branch manager's lending limit
(consent shall be deemed granted if within one business day of written notice
delivered to CVB's Chief Lending Officer, notice of objection is not received by
ONB);

            6.1.10 change its tax or accounting policies and procedures or any
method or period of accounting unless required by generally accepted accounting
principles or a Governmental Entity;

            6.1.11 grant or commit to grant any extension of credit or amend the
terms of any such credit outstanding on the date hereof to any executive
officer, director or holder of 10%



<PAGE>   46

or more of the outstanding ONB Stock, or any Affiliate of such Person, if such
credit would exceed $100,000 (consent shall be deemed granted if within one
business day of written notice delivered to CVB's Chief Lending Officer, notice
of objection is not received by ONB);

            6.1.12 close any offices at which business is conducted or open any
new offices;

            6.1.13 adopt or enter into any new employment agreement or other
employee benefit plan or arrangement or amend or modify any employment agreement
or employee benefit plan or arrangement of any such type except for such
amendments as are required by law;

            6.1.14 initiate, solicit or encourage (including by way of
furnishing information or assistance), or take any other action intended to
facilitate, any inquiries or the making of any proposal which constitutes, or
may reasonably be expected to lead to, any Competing Transaction (as such term
is defined below), or negotiate with any person in furtherance of such inquiries
or to obtain a Competing Transaction, or agree to or endorse any Competing
Transaction, or authorize or permit any of its or Orange's officers, directors
or employees or any investment banker, financial advisor, attorney, accountant
or any other representative retained by it or any of its Affiliates to take any
such action, and ONB shall promptly notify CVB (orally and in writing) of all of
the relevant details relating to all inquiries and proposals which it may
receive relating to any of such matters. For purposes of this Agreement,
"Competing Transaction" shall mean any of the following involving ONB or Orange:
any merger, consolidation, share exchange or other business combination; a sale,
lease, exchange, mortgage, pledge, transfer or other disposition of assets of
ONB or Orange representing 10% or more of the consolidated assets of ONB; a sale
of shares of capital stock (or securities convertible or exchangeable into or
otherwise evidencing, or any agreement or instrument evidencing, the right to
acquire capital stock), representing 10% or more of the voting power of ONB or
Orange; a tender offer or exchange offer for at least 10% of the outstanding
shares; a solicitation of proxies in opposition to approval of the Merger by
ONB's shareholders; or a public announcement of an unsolicited bona fide
proposal, plan, or intention to do any of the foregoing. Notwithstanding any
other provision in this Section 6.1.14 or elsewhere in this Agreement, (a)
nothing herein shall prevent ONB's Board of Directors from disclosing to ONB's
shareholders a position with respect to a tender offer pursuant to Rule 14d-9
and 14e-2 promulgated under the Exchange Act and (b) this Agreement shall not
restrict ONB from taking any action if the Board of Directors of ONB concludes
in good faith based upon consultation with its outside legal counsel, that such
action is required in order for the Board of Directors of ONB to avoid a
substantial risk of liability with respect to its fiduciary obligations to the
ONB shareholders under applicable law; provided, however, that nothing herein
shall prohibit CVB from terminating this Agreement pursuant to Section 13.1.8
hereof.

            6.1.15 make any material change in any basic policies and practices
with respect to liquidity management and cash flow planning, marketing, deposit
origination, lending, budgeting, profit and tax planning, personnel practices or
any other material aspect of ONB's or Orange's business or operations, except
such changes as may be required in the opinion of ONB's or Orange's management
to respond to economic or market conditions or as may be required by any
Governmental Entity;




<PAGE>   47

            6.1.16 grant any Person a power of attorney or similar authority;

            6.1.17 make any investment by purchase of stock or securities
(including an Investment Security), contributions to capital, property transfers
or otherwise in any other Person, except for federal funds or obligations of the
United States Treasury or an agency of the United States Government the
obligations of which are entitled to or implied to have the full faith and
credit of the United States government and which have an original maturity not
in excess of one year, or bank qualified investment grade municipal bonds, in
any case, in the ordinary course of business consistent with past practices and
which are not designated as trading;

            6.1.18 amend or modify any Scheduled Contract or enter into any
agreement or contract that would be a Scheduled Contract under Section 4.16;

            6.1.19 sell, transfer, mortgage, encumber or otherwise dispose of
any assets or release or waive any claim, except in the ordinary course of
business and consistent with past practices;

            6.1.20 take any action which would or is reasonably likely to (i)
adversely affect the ability of CVB, CBB, ONB or Orange to obtain any necessary
approval of any Governmental Entity required for the transactions contemplated
hereby; (ii) adversely affect ONB's ability to perform its covenants and
agreements under this Agreement; or (iii) result in any of the conditions to the
performance of CVB's or ONB's obligations hereunder, as set forth in Articles 9
or 10 herein not being satisfied;

            6.1.21 make any special or extraordinary payments to any Person in
an aggregate amount to that Person which is excess of $10,000, provided,
however, payments pursuant to this Section 6.1.21 may not be made to any
employee of ONB or Orange;

            6.1.22 reclassify any Investment Security from hold-to-maturity or
available for sale to trading;

            6.1.23 sell any security other than in the ordinary course of
business, or engage in gains trading;

            6.1.24 take title to any real property without conducting prior
thereto an environmental investigation, which investigation shall disclose the
absence of any suspected environmental contamination;

            6.1.25 take or cause to be taken any action which would disqualify
either the Merger or the Bank Merger as a "reorganization" within the meaning of
Section 368 of the Code or prevent CVB from accounting for the business
combination to be effected by the Merger and the Bank Merger as a
pooling-of-interests;

            6.1.26 settle any claim, action or proceeding involving any material
liability for monetary damages or enter into any settlement agreement containing
material obligations;




<PAGE>   48


            6.1.27 make, acquire a participation in, or reacquire an interest in
a participation sold of, any loan that is not in compliance with its normal
credit underwriting standards, policies and procedures as in effect on December
31, 1998; or renew, extend the maturity of, or alter any of the material terms
of any such loan for a period of greater than six months;

            6.1.28 incur any indebtedness for borrowed money or assume,
guaranty, endorse or otherwise as an accommodation become responsible for the
obligations of any other person, except for (i) in connection with banking
transactions with banking customers in the ordinary course of business, or (ii)
short-term borrowings made at prevailing market rates and terms; or

            6.1.29 agree or make any commitment to take any actions prohibited
by this Section 6.1.

        6.2 Affirmative Conduct Prior to Effective Time of the Merger. Between
the date hereof and the Effective Time of the Merger, ONB shall (and shall cause
Orange and Mortgage Brokerage to):

            6.2.1 use its commercially reasonable efforts consistent with this
Agreement to maintain and preserve intact its present business organization and
to maintain and preserve its relationships and goodwill with account holders,
borrowers, employees and others having business relationships with ONB, Orange
or Mortgage Brokerage;

            6.2.2 use its commercially reasonable efforts to keep in full force
and effect all of the existing material permits and licenses of ONB, Orange and
Mortgage Brokerage;

            6.2.3 use its commercially reasonable efforts to maintain insurance
coverage at least equal to that now in effect on all properties for which it is
responsible and on its business operations;

            6.2.4 perform its material contractual obligations and not become in
material default on any such obligations;

            6.2.5 duly observe and conform in all material respects to all
lawful requirements applicable to its business;

            6.2.6 maintain its assets and properties in good condition and
repair, normal wear and tear excepted;

            6.2.7 promptly upon learning of such information, advise CVB in
writing of any event or any other transaction within its knowledge whereby any
Person or Related Group of Persons acquires, directly or indirectly, record or
beneficial ownership or control (as defined in Rule 13d-3 promulgated by the SEC
under the Exchange Act) of 5% or more of the outstanding ONB Stock prior to the
record date fixed for the ONB Shareholders' Meeting or any adjourned meeting
thereof to approve this Agreement and the transactions contemplated herein;

            6.2.8 promptly notify CVB regarding receipt from any tax authority
of any notification of the commencement of an audit, any request to extend the
statute of limitations,



<PAGE>   49


any statutory notice of deficiency, any revenue agent's report, any notice of
proposed assessment, or any other similar notification of potential adjustments
to the tax liabilities of ONB, or any actual or threatened collection
enforcement activity by any tax authority with respect to tax liabilities of
ONB;

            6.2.9 make available to CVB monthly unaudited balance sheets and
income statements of ONB within 25 days after the close of each calendar month;

            6.2.10 not later than the 30th day of each calendar month, amend or
supplement the ONB Lists prepared and delivered pursuant to Article 4 to ensure
that the information set forth in the ONB Lists accurately reflects the
then-current status of ONB and Orange. ONB shall further amend or supplement the
ONB Lists as of the Closing Date if necessary to reflect any additional
information that needs to be included in the ONB Lists;

            6.2.11 use its commercially reasonable efforts to obtain any
third-party consent with respect to any contract, agreement, lease, license,
arrangement, permit or release that is material to the business of ONB or Orange
or that is contemplated in this Agreement as required in connection with the
Merger or the Bank Merger;

            6.2.12 maintain an allowance for loan and lease losses consistent
with practices and methodology as in effect on the date of the execution of this
Agreement;

            6.2.13 furnish to Manatt, Phelps & Phillips, LLP promptly upon its
written request written representations and certificates as deemed reasonably
necessary or appropriate for purposes of enabling Manatt, Phelps & Phillips, LLP
to render the tax opinion referred to in Section 9.6 hereof.

        6.3 Access to Information.

            6.3.1 ONB will afford, upon reasonable request, to CVB and its
representatives, counsel, accountants, agents and employees reasonable access
during normal business hours to all of their business, operations, properties,
books, files and records and will do everything reasonably necessary to enable
CVB and its representatives, counsel, accountants, agents and employees to make
a complete examination of the financial statements, business, assets and
properties of ONB and Orange and the condition thereof and to update such
examination at such intervals as CVB shall deem appropriate. Such examination
shall be conducted in cooperation with the officers of ONB and Orange and in
such a manner as to minimize any disruption of, or interference with, the normal
business operations of ONB and Orange. Upon the request of CVB, ONB will request
M&P to provide reasonable access to representatives of Deloitte & Touche working
on behalf of CVB to auditors' work papers with respect to the business and
properties of ONB and Orange, including tax accrual work papers prepared for ONB
and Orange during the preceding 60 months, other than (a) books, records and
documents covered by the attorney-client privilege, or that are attorneys' work
product, and (b) books, records and documents that ONB or Orange is legally
obligated to keep confidential. No examination or review conducted under this
section shall constitute a waiver or relinquishment on the part of CVB of the
right to rely upon the representations and warranties made by ONB herein;
provided, that CVB shall disclose to ONB any fact or circumstance it may
discover




<PAGE>   50


which CVB believes renders any representation or warranty made by ONB hereunder
incorrect in any respect. CVB covenants and agrees that it, its subsidiaries,
and their respective representatives, counsel, accountants, agents and employees
will hold in strict confidence all documents and information concerning ONB and
Orange so obtained from any of them (except to the extent that such documents or
information are a matter of public record or require disclosure in the Proxy
Statement and Prospectus or any of the public information of any applications
required to be filed with any Governmental Entity to obtain the approvals and
consents required to effect the transactions contemplated hereby), and if the
transactions contemplated herein are not consummated, such confidence shall be
maintained and all such documents shall be returned to ONB.

            6.3.2 A representative of CVB, selected by CVB in its sole
discretion, shall be authorized and permitted to review each loan, lease, or
other credit funded or renewed by ONB or Orange after the date hereof, and all
information associated with such loan, lease or other credit within three
Business Days of such funding or renewal, such review to take place, if
possible, on ONB's premises.

            6.3.3 A representative of CVB, selected by CVB in its sole
discretion, shall be permitted by ONB and Orange to attend all regular and
special Board of Directors' and committee meetings of ONB and Orange from the
date hereof until the Effective Time of the Merger; provided, however, that the
attendance of such representative shall not be permitted at any meeting, or
portion thereof, for the purpose of discussing the transactions contemplated or
affected by this Agreement or the obligations of ONB under this Agreement.

        6.4 Review by Accountants. Promptly upon request of CVB, ONB will
request M&P to permit representatives of Deloitte & Touche working on behalf of
CVB to review and examine the work papers of M&P relating to ONB and Orange and
the Financial Statements of ONB and to review and examine the work papers of M&P
relating to any future completed audits or completed reviews of ONB and Orange.

        6.5 Filings. ONB agrees that through the Effective Time of the Merger,
each of ONB's or Orange's reports, registrations, statements and other filings
required to be filed with any applicable Governmental Entity will comply in all
material respects with all the applicable statutes, rules and regulations
enforced or promulgated by the Governmental Entity with which it will be filed
and none will contain any untrue statement of material fact or omit to state a
material fact required to be stated therein or necessary to make the statements
therein, in light of the circumstances under which they were made, not
misleading. Any financial statement contained in any such report, registration,
statement or other filing that is intended to present the financial position of
the entity to which it relates will fairly present the financial position of
such entity and will be prepared in accordance with generally accepted
accounting principles or applicable banking regulations consistently applied
during the periods involved, except where any misstatement or omission (other
than for financial statements filed with the SEC) would not make the statements
therein, in light of the circumstances under which they were made, misleading.

        6.6 Notices; Reports. ONB will promptly notify CVB of any event of which
ONB obtains knowledge which has had or may reasonably be expected to have a
material adverse



<PAGE>   51

effect on the financial condition, operations, business or prospects of ONB on a
consolidated basis, or in the event that ONB determines that it is unable to
fulfill any of the conditions to the performance of CVB's obligations hereunder,
as set forth in Articles 9 or 11 herein, and ONB will furnish CVB (i) as soon as
available, and in any event within one Business Day after it is mailed or
delivered to the Board of Directors of ONB or Orange or committees thereof, any
report by ONB or Orange for submission to the Board of Directors of ONB or
Orange or committees thereof, provided, however, that ONB need not furnish to
CVB communications of ONB's legal counsel regarding ONB's rights and obligations
under this Agreement or the transactions contemplated hereby, or books, records
and documents covered by confidentiality agreements or the attorney-client
privilege, or which are attorneys' work product, (ii) as soon as available, all
proxy statements, information statements, financial statements, reports, letters
and communications sent by ONB to its shareholders or other security holders,
and all reports filed by ONB or Orange with the FRB, the FDIC, the OCC or the
DFI, and (iii) such other existing reports as CVB may reasonably request
relating to ONB or Orange.

        6.7 ONB Shareholders' Meeting. Promptly after the execution of this
Agreement, ONB will take action necessary in accordance with applicable law and
its Articles of Incorporation and Bylaws to convene a meeting of its
shareholders to consider and vote upon this Agreement and the transactions
contemplated hereby so as to permit the consummation of the transactions
contemplated hereby. The Board of Directors of ONB shall, subject to its
fiduciary duties, recommend that its shareholders approve this Agreement and the
transactions contemplated hereby, and the Board of Directors of ONB shall,
subject to its fiduciary duties, use its best efforts to obtain the affirmative
vote of the holders of the largest possible percentage of the outstanding ONB
Stock to approve this Agreement and the transactions contemplated hereby.

        6.8 Certain Loans and Other Extensions of Credit. ONB will promptly
inform CVB of the amounts and categories of any loans, leases or other
extensions of credit that have been classified by any bank regulatory authority
or by any unit of ONB or Orange or by any other Person as "Criticized,"
"Specially Mentioned," "Substandard," "Doubtful," "Loss" or any comparable
classification ("Classified Credits"). ONB will furnish CVB, as soon as
practicable, and in any event within 20 days after the end of each calendar
month, schedules including the following: (a) Classified Credits (including with
respect to each credit its classification category and the originating unit);
(b) nonaccrual credits (including the originating unit); (c) accrual exception
credits that are delinquent 90 or more days and have not been placed on
nonaccrual status (including its originating unit); (d) credits delinquent as to
payment of principal or interest (including its originating unit), including an
aging into current-to-29, 30-59, 60-89, and 90+ day categories; (e)
participating loans and leases, stating, with respect to each, whether it is
purchased or sold and the originating unit; (f) loans or leases (including any
commitments) by ONB or Orange to any ONB or Orange director, officer at or above
the senior vice president level, or shareholder holding 10% or more of the
capital stock of ONB, including with respect to each such loan or lease the
identity and, to the knowledge of ONB, the relation of the borrower to ONB or
Orange, and the outstanding and undrawn amounts; (g) letters of credit
(including the originating unit); (h) loans or leases wholly or partially
charged off during the previous month (including with respect to each loan or
lease, the originating amount, the write-off amount and its originating unit);
and (i) other real estate or assets acquired in satisfaction of debt.




<PAGE>   52


        6.9 Applications. Subject to Section 7.5, ONB will promptly prepare or
cause to be prepared the portions of the Proxy Statement and Prospectus as it
pertains to ONB or Orange and any other applications necessary to consummate the
transactions contemplated hereby, and further agrees to provide any information
requested by CVB for the preparation of any applications necessary to consummate
the transactions contemplated hereby. ONB shall afford CVB a reasonable
opportunity to review the portions of the Proxy Statement and Prospectus
pertaining to ONB or Orange and all such applications and all amendments and
supplements thereto before the filing thereof. ONB covenants and agrees that,
with respect to the information relating to ONB or Orange, the Proxy Statement
and Prospectus will comply in all material respects with the provisions of
applicable law, and will not contain any untrue statement of material fact or
omit to state any material fact required to be stated therein or necessary to
make the statements contained therein, in light of the circumstances under which
they were made, not misleading. ONB will use its commercially reasonable efforts
to obtain all regulatory approvals or consents necessary to effect the Merger
and the transactions contemplated herein.

        6.10 Affiliate Agreements. Concurrently with the execution of this
Agreement, (a) ONB shall deliver to CVB a letter identifying all persons who are
then "affiliates" of ONB for purposes of Rule 145 under the Securities Act and
(b) ONB shall advise the persons identified in such letter of the resale
restrictions imposed by applicable securities laws and shall use reasonable
efforts to obtain from each person identified in such letter a written agreement
substantially in the form attached hereto as Exhibit C. ONB shall use reasonable
efforts to obtain from any person who becomes an affiliate of ONB after ONB's
delivery of the letter referred to above, and on or prior to the date of the ONB
Shareholders' Meeting to approve this Agreement, a written agreement
substantially in the form attached as Exhibit C hereto as soon as practicable
after obtaining such status.

        6.11 Coordination of Dividends. ONB shall coordinate with CVB the
declaration of any dividends that may be allowed pursuant to Section 6.1.2
hereof, and the record date and the payment dates relating thereto, it being the
intention of the parties that holders of ONB Stock shall not receive two
dividends, or fail to receive one dividend, for any applicable dividend period
with respect to their shares of ONB Stock and any shares of CVB Stock any such
holder will receive in exchange therefor in the Merger.

        6.12 Bank Merger. ONB and Orange shall, at the request of CVB, (i) take
all necessary corporate and other action, to adopt and approve the Bank Merger,
(ii) execute, deliver, and, where appropriate, file any and all documents
necessary or desirable to permit the Bank Merger immediately following the
Merger, and (iii) take and cause to be taken any other action to permit the
consummation of transactions contemplated in connection with the Bank Merger.
Neither ONB nor Orange shall take any action that would prevent performance.

        6.13 Mortgage Brokerage. At the request of CVB, ONB shall promptly take
all action necessary to merge Mortgage Brokerage into Orange or dissolve
Mortgage Brokerage as a corporation.




<PAGE>   53


                                   ARTICLE 7.

              COVENANTS OF CVB PENDING EFFECTIVE TIME OF THE MERGER

            CVB covenants and agrees with ONB as follows:

        7.1 Limitation on Conduct Prior to Effective Time of the Merger. Between
the date hereof and the Effective Time of the Merger, except as contemplated by
this Agreement and subject to requirements of law and regulation generally
applicable to bank holding companies and banks, each of CVB and its subsidiaries
shall not, without the prior written consent of ONB, which consent shall not be
unreasonably withheld:

            7.1.1 take any action which would or is reasonably likely to (i)
adversely affect the ability of CVB to obtain any necessary approvals of any
Governmental Entity required for the transactions contemplated hereby; (ii)
adversely affect CVB's ability to perform its covenants and agreements under
this Agreement; or (iii) result in any of the conditions to the performance of
CVB's obligations hereunder, as set forth in Articles 9 or 11 herein not being
satisfied;

            7.1.2 take or cause to be taken any action which would disqualify
the Merger as a "reorganization" within the meaning of Section 368 of the Code
or prevent CVB from accounting for the business combination to be effected by
the Merger as a pooling-of-interests;

            7.1.3 amend its articles of incorporation in any respect which would
materially and adversely affect the rights and privileges attendant to the CVB
Stock; or

            7.1.4 agree or make any commitment to take any actions prohibited by
this Section 7.1.

        7.2 Affirmative Conduct of CVB and Subsidiaries Prior to Effective Time
of the Merger. Between the date hereof and the Effective Time of the Merger, CVB
shall:

            7.2.1 duly observe and conform in all material respects to all
lawful requirements applicable to the business of CVB or any subsidiary of CVB;

            7.2.2 use its commercially reasonable efforts to obtain any third
party consent with respect to any contract, agreement, lease, license,
arrangement, permit or release that is material to the business of CVB on a
consolidated basis and that is contemplated in this Agreement as required in
connection with the Merger; and

            7.2.3 not later than the 20th day of each calendar month, amend or
supplement the CVB Lists prepared and delivered pursuant to Article 5 to ensure
that the information set forth in the CVB Lists accurately reflects the
then-current status of CVB and its subsidiaries. CVB shall further amend or
supplement the CVB Lists as of the Closing Date if necessary to reflect any
additional information that needs to be included in the CVB Lists.

        7.3 Access to Information. Upon reasonable request by ONB, CVB shall (i)
make its Chief Operating Officer/Chief Financial Officer and Controller
available to discuss with ONB



<PAGE>   54

and its representatives CVB's operations; and (ii) shall provide ONB with
written information which is (a) similar to the written information that ONB
reviewed in connection with this Agreement, and (b) related to CVB's business
condition, operations and prospects on a consolidated basis. No examination or
review conducted under this section shall constitute a waiver or relinquishment
on the part of ONB of the right to rely upon the representations and warranties
made by CVB herein; provided, that ONB shall disclose to CVB any fact or
circumstance it may discover which ONB believes renders any representation or
warranty made by CVB hereunder incorrect in any respect. ONB covenants and
agrees that it and its representatives, counsel, accountants, agents and
employees will hold in strict confidence all documents and information
concerning CVB so obtained (except to the extent that such documents or
information are a matter of public record or require disclosure in the Proxy
Statement and Prospectus or any of the public information of any applications
required to be filed with any Governmental Entity to obtain the approvals and
consents required to effect the transactions contemplated hereby), and if the
transactions contemplated herein are not consummated, such confidence shall be
maintained and all such documents shall be returned to CVB. CVB shall promptly
provide ONB with copies of as soon as available, of all proxy statements,
information statements, financial statements, reports, letters and
communications sent by CVB to its shareholders or other security holders, and
all public reports filed by CVB or CBB with the FRB, FDIC, OCC or the DFI.

        7.4 Filings. CVB agrees that through the Effective Time of the Merger,
each of its reports, registrations, statements and other filings required to be
filed with any applicable Governmental Entity will comply in all material
respects with all the applicable statutes, rules and regulations enforced or
promulgated by the Governmental Entity with which it will be filed and none will
contain any untrue statement of a material fact or omit to state a material fact
required to be stated therein or necessary to make the statements therein, in
light of the circumstances under which they were made, not misleading. Any
financial statement contained in any such report, registration, statement or
other filing that is intended to present the financial position of the entities
or entity to which it relates will fairly present the financial position of such
entities or entity and will be prepared in accordance with generally accepted
accounting principles or applicable banking regulations consistently applied
during the periods involved except where any misstatement or omission (other
than for those filed financial statements with the SEC) would not make the
statements therein, in light of the circumstances under which they were made,
misleading.

            The Board of Directors of the Surviving Corporation shall reasonably
consider the filing of a Form 8-K as soon as practicable following 30 days of
combined results of operations of the Surviving Corporation.

        7.5 Applications. CVB will promptly prepare and file or cause to be
prepared and filed (i) an application for approval of the Merger with the FDIC,
FRB and the DFI; (ii) an application for approval of the Bank Merger with the
FDIC and the DFI; (iii) in conjunction with and using its best efforts to
cooperate with, ONB, the Registration Statement on Form S-4 and the Proxy
Statement and Prospectus as it pertains to CVB; and (iv) any other applications
necessary to consummate the transactions contemplated hereby. CVB shall afford
ONB a reasonable opportunity to review the Proxy Statement and Prospectus and
all such applications and all amendments and supplements thereto before the
filing thereof. CVB covenants and




<PAGE>   55

agrees that the Registration Statement on Form S-4 and the Proxy Statement and
Prospectus and all applications to the appropriate regulatory agencies for
approval or consent to the Merger, with respect to information relating to CVB
or its subsidiaries, will comply in all material respects with the provisions of
applicable law, and will not contain any untrue statement of material fact or
omit to state any material fact required to be stated therein or necessary to
make the statements contained therein, in light of the circumstances under which
they were made, not misleading. CVB will use its commercially reasonable efforts
to obtain all regulatory approvals or consents necessary to effect the Merger
and the Bank Merger.

        7.6 Blue Sky. CVB agrees to use commercially reasonable efforts to have
the shares of CVB Stock to be issued in connection with the Merger qualified or
registered for offer and sale, to the extent required, under the securities laws
of each jurisdiction in which shareholders of ONB reside.

        7.7 Notices; Reports. CVB will promptly notify ONB of any event of which
CVB obtains knowledge which has had or may have a material adverse affect on the
financial condition, operations, business or prospects of CVB on a consolidated
basis or in the event that CVB determines that it is unable to fulfill any of
the conditions to the performance of ONB's obligations hereunder, as set forth
in Articles 9 or 10 herein.

        7.8 Removal of Conditions. In the event of the imposition of a condition
to any regulatory approvals which CVB deems to materially adversely affect it or
to be materially burdensome, CVB shall use its commercially reasonable efforts
for purposes of obtaining the removal of such condition.

        7.9 Stock Options.

            7.9.1 At and as of the Effective Time of the Merger, CVB shall
assume each and every outstanding option to purchase shares of ONB Stock ("ONB
Stock Option") and all obligations of ONB under the ONB Stock Option Plans. Each
and every ONB Stock Option so assumed by CVB under this Agreement shall continue
to have, and be subject to, the same terms and conditions set forth in the ONB
Stock Option Plans and in the other documents governing such ONB Stock Option
immediately prior to the Effective Time of the Merger, except that: (i) such ONB
Stock Option shall be exercisable for that number of whole shares of CVB Stock
equal to the product of (A) the number of shares of ONB Stock that were
purchasable under such ONB Stock Option immediately prior to the Effective Time
of the Merger multiplied by (B) the Conversion Ratio, rounded down to the
nearest whole number of shares of CVB Stock; and (ii) the per share exercise
price for the shares of CVB Stock issuable upon exercise of such ONB Stock
Option shall be equal to the quotient determined by dividing (A) the exercise
price per share of ONB Stock at which such ONB Stock Option was exercisable
immediately prior to the Effective Time of the Merger by (B) the Conversion
Ratio. Prior to the Effective Time of the Merger, CVB shall issue to each holder
of an outstanding ONB Stock Option a document evidencing the assumption of such
ONB Stock Option by CVB pursuant to this Section 7.9.

            7.9.2 CVB shall comply with the terms of the ONB Stock Option Plan
and use its reasonable best efforts so that, to the extent required by, and
subject to the provisions of, such




<PAGE>   56


Plans, ONB Stock Options which qualify as incentive stock options prior to the
Effective Time of the Merger qualify as incentive stock options of CVB after the
Effective Time of the Merger.

            7.9.3 At or prior to the Effective Time of the Merger, CVB shall
take all corporate action necessary to reserve for issuance a sufficient number
of shares of CVB Stock for delivery upon exercise of CVB Stock Options assumed
by it in accordance with this Section 7.9. At the Effective Time, or as soon as
practicable thereafter, CVB shall, if necessary, file a registration statement
on Form S-8, as the case may be (or any successor or other appropriate forms);
or another appropriate form with respect to the shares of CVB Common Stock
subject to such options and shall use all reasonable efforts to maintain the
effectiveness of such registration statement (and maintain the current status of
the prospectus or prospectuses contained therein) for so long as such options
remain outstanding.

        7.10 Reservation, Issuance and Registration of CVB Stock. CVB shall
reserve and make available for issuance in connection with the Merger and in
accordance with the terms and conditions of this Agreement such number of shares
of CVB Stock to be issued to the shareholders of ONB in the Merger pursuant to
Article 2 hereof.

        7.11 AMEX Listing. CVB shall use its commercially reasonable efforts to
cause the shares of CVB Stock to be issued in the Merger to be approved for
listing on the American Stock Exchange, subject to official notice of issuance,
prior to the Effective Time of the Merger.

        7.12 CVB Shareholders' Meeting. Promptly after the execution of this
Agreement, CVB will take action necessary in accordance with applicable law and
its Articles of Incorporation and Bylaws to convene a meeting of its
shareholders, if required by applicable law, to consider and vote upon the
Agreement and the transactions contemplated hereby so as to permit the
consummation of the transactions contemplated hereby. The Board of Directors of
CVB shall, subject to its fiduciary duties, recommend that its shareholders
approve this Agreement and the transactions contemplated hereby. The Board of
Directors of CVB shall further execute shareholders' agreements within 15
business days of the date hereof agreeing to vote their shares in favor of the
Merger.


                                   ARTICLE 8.

                              ADDITIONAL COVENANTS

            The parties hereto hereby mutually covenant and agree with each
other as follows:

        8.1 Best Efforts. Subject to the terms and conditions of this Agreement,
each party will use its best efforts to take, or cause to be taken, all actions
and to do, or cause to be done, all things necessary, proper or advisable under
applicable laws and regulations to consummate the transactions contemplated by
this Agreement as promptly as practical, including cooperation in preparation of
the Applications identified in Section 7.5 of this Agreement and including using
their respective best efforts to qualify the Merger and the Bank Merger for
pooling of interests accounting treatment. Each party will use its best efforts
to resolve and correct all typographical or other administrative errors which
may arise in or relating to this Agreement or in the other documents prepared or
executed in connection herewith.




<PAGE>   57


        8.2 Public Announcements. No press release or other public disclosure of
matters related to this Agreement or any of the transactions contemplated hereby
shall be made by CVB or ONB unless the other party shall have provided its prior
consent to the form and substance thereof; provided, however, that nothing
herein shall be deemed to prohibit any party hereto, following notice to the
other party, from making any disclosure which its counsel deems necessary or
advisable in order to fulfill such party's disclosure obligations imposed by
law.

        8.3 Environmental Assessment and Remediation. CVB may cause to be
prepared at CVB's sole cost and expense within 45 days of the date of this
Agreement one or more phase I environmental investigations with respect to the
Real Property set forth on the ONB Real Property List. In the event any such
phase I environmental investigation report, or any such report which ONB or
Orange has already obtained on any of the Real Property set forth on ONB's Real
Property List, discloses facts which, in the sole discretion of CVB, warrant
further investigation, CVB shall provide written notice to ONB, and ONB shall be
required to cause to be completed within 60 days of such written notice, at the
sole cost and expense of CVB, a phase II environmental investigation and report
with respect to such property. The consultant engaged by ONB to conduct such
investigation and provide such report shall be acceptable to CVB. CVB shall have
10 days from the receipt of such investigation report to object thereto, which
objection shall be by written notice. In the event of any such objection, CVB
shall engage an environmental consultant satisfactory to ONB who shall provide
an estimate of the cost of taking any remedial action recommended or suggested
in such phase II environmental investigation report, or which is required by
law, or which is determined to be prudent by CVB, in its sole discretion, and,
unless the estimated cost of such Remediation for which an independent
third-party consultant, jointly selected by ONB and CVB, would determine ONB or
Orange would be responsible for paying is in excess of $250,000 (and written
notice thereof provided by ONB to CVB) ONB shall immediately commence such
Remediation, all at the sole cost and expense of ONB. In the event such
environmental consultant determines that the estimated cost of such remediation
for which an independent third party consultant, jointly selected by ONB and CVB
would determine ONB or Orange would be responsible for paying is in excess of
$250,000, CVB shall have the right to terminate the Agreement pursuant to
Section 13.1.9 hereof before the expiration of 21 days from the date of such
written notice.

            CVB agrees to keep confidential and not to disclose any nonpublic
information obtained in the course of such environmental investigation relating
to environmental contamination or suspected contamination of any property on the
ONB Real Property List, except as required by law.

        8.4 Execution of Stock Option Agreement. Simultaneously with the
execution of this Agreement and as a condition thereto, ONB and CVB shall have
executed and delivered a stock option agreement which grants CVB an option to
acquire up to 19.9% of the issued and outstanding shares of ONB stock upon the
occurrence of certain circumstances, substantially in the form attached hereto
as Exhibit D.




<PAGE>   58


                                   ARTICLE 9.

                       CONDITIONS PRECEDENT TO THE MERGER

            The obligations of each of the parties hereto to consummate the
transactions contemplated herein are subject to the satisfaction, on or before
the Closing Date, of the following conditions:

        9.1 Shareholder Approval. The Agreement and the transactions
contemplated hereby shall have received all requisite approvals of the
shareholders of ONB and CVB.

        9.2 No Judgments or Orders. No judgment, decree, injunction, order or
proceeding shall be outstanding or threatened by any Governmental Entity which
prohibits or restricts the effectuation of, or threatens to invalidate or set
aside, the Merger or the Bank Merger substantially in the form contemplated by
this Agreement, unless counsel to the party against whom such action or
proceeding was instituted or threatened renders to the other parties hereto an
opinion that such judgment, decree, injunction, order or proceeding is without
merit.

        9.3 Regulatory Approvals. To the extent required by applicable law or
regulation, all approvals or consents of any Governmental Entity, including,
without limitation, those of the FRB, the FDIC and the DFI shall have been
obtained or granted for the Merger and the Bank Merger and the transactions
contemplated hereby and the applicable waiting period under all laws shall have
expired. All other statutory or regulatory requirements for the valid completion
of the transactions contemplated hereby shall have been satisfied.

        9.4 Securities Laws. The Registration Statement on Form S-4 shall have
been declared effective by the SEC and shall not be the subject of any stop
order or proceedings seeking or threatening a stop order. CVB shall have
received all state securities or "Blue Sky" permits and other authorizations
necessary to issue the CVB Stock to consummate the Merger.

        9.5 Listing. The CVB Stock issuable in the Merger shall have been
included for listing on AMEX.

        9.6 Tax Opinions. CVB and ONB shall have received from Manatt, Phelps &
Phillips, LLP an opinion reasonably satisfactory to CVB and ONB to the effect
that the Merger and the Bank Merger shall not result in the recognition of gain
or loss for federal income tax purposes to CVB, CBB, ONB or Orange, nor shall
the issuance of the CVB Stock result in the recognition of gain or loss by the
holders of ONB Stock who receive such stock in connection with the Merger, dated
prior to the date the Proxy Statement and Prospectus is first mailed to the
shareholders of ONB and CVB and such opinions shall not have been withdrawn or
modified in any material respect.

        9.7 Pooling of Interests. Immediately prior to the Effective Time of the
Merger, CVB shall have received from Deloitte & Touche a written confirmation
that the Merger and the Bank Merger will qualify for pooling-of-interests
accounting treatment. In making its determination that the Merger and the Bank
Merger will qualify for such treatment, Deloitte & Touche shall be entitled to
assume that cash will be paid with respect to all shares held of record by any
holder of ONB and CVB Dissenting Shares. Immediately prior to the Effective Time
of the Merger, CVB




<PAGE>   59

and Deloitte & Touche shall have received from McGladry & Pullen a written
confirmation that ONB and Orange qualify for pooling of interests accounting
treatment in the Merger and Bank Merger.


                                  ARTICLE 10.

                 CONDITIONS PRECEDENT TO THE OBLIGATIONS OF ONB

             All of the obligations of ONB to effect the transactions
contemplated hereby shall be subject to the satisfaction, on or before the
Closing Date, of the following conditions, any of which may be waived in writing
by ONB:

        10.1 Legal Opinion. ONB shall have received the opinion of Manatt,
Phelps & Phillips, LLP, dated as of the Closing Date, and in form and substance
satisfactory to the counsel of ONB and Orange, to the effect that: (i) CVB is a
corporation validly existing under the laws of the State of California with full
corporate power and authority to enter into this Agreement and to consummate the
transactions contemplated hereby; (ii) all corporate proceedings on the part of
CVB necessary to be taken in connection with the Merger in order to make the
same effective have been duly and validly taken; (iii) this Agreement and the
Agreement of Merger have been duly and validly authorized, executed and
delivered on behalf of CVB and constitute (subject to standard exceptions of
enforceability arising from the bankruptcy laws and rules of equity) valid and
binding agreements of CVB; and (iv) the shares of CVB Stock to be issued in the
Merger will, when issued, be duly authorized, validly issued, fully paid and
nonassessable.

        10.2 Representations and Warranties; Performance of Covenants. All the
covenants, terms and conditions of this Agreement to be complied with and
performed by CVB on or before the Closing Date shall have been complied with and
performed in all material respects. Each of the representations and warranties
of CVB contained in Article 5 hereof shall have been true and correct in all
material respects (except that where any statement in a representation or
warranty expressly includes a standard of materiality, such statement shall be
true and correct in all respects) on and as of the date of this Agreement and
(except to the extent such representations and warranties speak as of an earlier
date or for changes expressly contemplated by this Agreement) on and as of the
Closing Date, with the same effect as though such representations and warranties
had been made on and as of the Closing Date. It is understood and acknowledged
that the representations being made on and as of the Closing Date shall be made
without giving effect to any update with respect to the CVB Lists in accordance
with Section 7.2.3.

        10.3 Authorization of Merger. All actions necessary to authorize the
execution, delivery and performance of this Agreement and the Agreement of
Merger by CVB and the consummation of the transactions contemplated hereby and
thereby shall have been duly and validly taken by the Board of Directors of CVB,
as required by applicable law, and CVB shall have full power and right to merge
pursuant to the Agreement of Merger.

        10.4 Absence of Certain Changes. Between the date of this Agreement and
the Effective Time of the Merger, there shall not have occurred any event that
has had or could reasonably be expected to have a material adverse effect on the
business, financial condition, results of operations or prospects of CVB on a
consolidated basis, whether or not such event,



<PAGE>   60


change or effect is reflected in the CVB Lists as amended or supplemented after
the date of this Agreement.

        10.5 Officers' Certificate. There shall have been delivered to ONB on
the Closing Date a certificate executed by the Chief Executive Officer and the
Chief Financial Officer of CVB certifying, to the best of their knowledge,
compliance with all of the provisions of Sections 10.2, 10.3 and 10.4.

        10.6 Fairness Opinion. ONB shall have received a letter from First
Security--Van Kasper, or such other nationally recognized advisory firm
reasonably selected by ONB, dated as of a date within five Business Days of the
mailing of the Proxy Statement and Prospectus to the shareholders of ONB, to the
effect that the transactions contemplated by this Agreement are fair from a
financial point of view to the shareholders of ONB.


                                  ARTICLE 11.

                   CONDITIONS PRECEDENT TO OBLIGATIONS OF CVB

             All of the obligations of CVB to effect the transactions
contemplated hereby shall be subject to the satisfaction, on or before the
Closing Date, of the following conditions, any of which may be waived in writing
by CVB:

        11.1 Legal Opinion. CVB shall have received the opinion of Brobeck,
Phleger & Harrison, LLP, attorneys for ONB, and in form and substance
satisfactory to the counsel of CVB, to the effect that: (i) ONB is a corporation
duly incorporated and validly existing under the laws of the State of California
with full corporate power and authority to enter into this Agreement and the
Agreement of Merger and to consummate the transactions contemplated hereby and
thereby; (ii) Orange is a national association duly incorporated and validly
existing under the laws of the United States with full corporate power and
authority to enter into the Agreement of Bank Merger and to consummate the
transactions contemplated thereby; (iii) all corporate proceedings on the part
of ONB necessary to be taken in connection with the Merger and by Orange in
connection with the Bank Merger in order to make the same effective have been
duly and validly taken; and (iv) this Agreement and the Agreement of Merger and
the Agreement of Bank Merger have been duly and validly authorized, executed and
delivered on behalf of ONB and Orange, and constitute (subject to standard
exceptions of enforceability arising from the bankruptcy laws and rules of
equity) valid and binding agreements of ONB and Orange, as applicable.

        11.2 Representations and Warranties; Performance of Covenants. All the
covenants, terms and conditions of this Agreement to be complied with and
performed by ONB at or before the Closing Date shall have been complied with and
performed in all material respects. Each of the representations and warranties
of ONB contained in Article 4 hereof shall have been true and correct in all
material respects (except that where any statement in a representation or
warranty expressly includes a standard of materiality, such statement shall be
true and correct in all respects) on and as of the date of this Agreement and
(except to the extent such representations and warranties speak as of an earlier
date or for changes expressly contemplated by this




<PAGE>   61

Agreement) on and as of the Closing Date, with the same effect as though such
representations and warranties had been made on and as of the Closing Date. It
is understood and acknowledged that the representations being made on and as of
the Closing Date shall be made without giving effect to any update with respect
to the ONB Lists in accordance with Section 6.2.10.

        11.3 Authorization of Mergers. All actions necessary to authorize the
execution, delivery and performance of this Agreement and the Agreement of
Merger by ONB and of the Agreement of Bank Merger by Orange, and the
consummation of the transactions contemplated hereby and thereby shall have been
duly and validly taken by the Board of Directors and shareholders of ONB and
Orange, and ONB and Orange shall have full power and right to merge pursuant to
the Agreement of Merger and the Agreement of Bank Merger, respectively.

        11.4 Third-Party Consents. ONB, Orange and Mortgage Brokerage shall have
obtained all consents of other parties to their respective mortgages, notes,
leases, franchises, agreements, licenses and permits as may be necessary to
permit the Merger and the Bank Merger and the transactions contemplated herein
to be consummated without a material default, acceleration, breach or loss of
rights or benefits thereunder.

        11.5 Absence of Certain Changes. Between the date of this Agreement and
the Effective Time of the Merger, there shall not have occurred any event that
has had or could reasonably be expected to have a material adverse effect on the
business, financial condition, results of operations or prospects of ONB on a
consolidated basis whether or not such event, change or effect is reflected in
the ONB Lists as amended or supplemented after the date of this Agreement.

        11.6 Officers' Certificate. There shall have been delivered to CVB on
the Closing Date a certificate executed by the Chief Executive Officer and the
Chief Financial Officer of ONB certifying, to the best of their knowledge,
compliance with all of the provisions of Sections 11.2, 11.3, 11.4 and 11.5.

        11.7 Fairness Opinion. CVB shall have received a letter from Bank
Advisory Group, Inc., or such other nationally recognized advisory firm
reasonably selected by CVB, dated as of a date within five Business Days of the
mailing of the Proxy Statement and Prospectus to the shareholders of CVB, to the
effect that the transactions contemplated by this Agreement are fair from a
financial point of view to the shareholders of CVB.

        11.8 Shareholder's Agreements. Concurrently with the execution of this
Agreement, each director of ONB and Orange shall have executed and delivered to
CVB agreements substantially in the form of Exhibit E hereto.

        11.9 Agreements Not to Compete. Concurrently with the execution of this
Agreement, the directors of ONB and Orange shall have executed and delivered to
CVB agreements substantially in the form of Exhibit F hereto.

        11.10 Affiliates Agreements. Concurrently with the execution of this
Agreement, CVB shall have received from each person named in the letter or
otherwise referred to in Section 6.10 an executed copy of an agreement
substantially in the form of Exhibit C hereto.




<PAGE>   62

        11.11 Employee Benefit Plans. CVB shall have received satisfactory
evidence that ONB has cooperated with CVB and taken such action as CVB shall
reasonably request with respect to all the ONB's employee benefit plans,
programs and arrangements, including, without limitation, the ONB 401(k) Plan,
as provided in Article 12 of this Agreement.

        11.12 Dissenting Shares. The number of shares of ONB Stock and CVB Stock
for which demand is made to be ONB Perfected Dissenting Shares and CVB Perfected
Dissenting Shares shall not exceed an amount which, when combined with other
amounts payable in connection with the Merger and the Bank Merger, would result
in the Merger and the Bank Merger being disqualified from pooling of interests
accounting treatment.

        11.13 Resignations. At the request of CVB, ONB shall use its best
efforts to deliver resignations of all the directors and executive officers of
ONB and Mortgage Brokerage, effective as of the Effective Time of the Merger
and, if requested by CVB, ONB shall use its best efforts to deliver the
resignations of all of the directors and executive officers of Orange effective
as of the Effective Time of the Bank Merger. In the event ONB is not able to
deliver the resignations of all of the directors and executive officers of ONB,
Mortgage Brokerage or Orange, ONB shall take such other action as CVB shall
request.


                                  ARTICLE 12.

                                EMPLOYEE BENEFITS

        12.1 Employee Benefits.

             Except as otherwise provided in this Agreement or pursuant to the
terms of such Employee Plans, all Employee Plans of ONB and Orange will be
discontinued or merged into CVB plans, in the discretion of CVB, and employees
of ONB and Orange shall become eligible for the employee benefit plans of CVB on
the same terms as such plans and benefits are generally offered from time to
time to employees of CVB and its subsidiaries in comparable positions with CVB
or its subsidiaries. For purposes of determining such employment eligibility and
vesting under the employee benefit plans of CVB (other than for the CVB 401(k)
and Profit Sharing Plan), CVB shall recognize such employees' years of service
with ONB or Orange beginning on the date such employees commenced employment
with ONB or Orange through the Effective Time of the Merger.

             The parties hereto further agree that certain other matters
respecting employee benefits shall be dealt with in a letter, dated the date
hereof, between the parties and hereby incorporated by reference and made a part
hereof.


                                  ARTICLE 13.

                                   TERMINATION

        13.1 Termination. This Agreement may be terminated at any time prior to
the Effective Time of the Merger upon the occurrence of any of the following:

             13.1.1 By mutual agreement of the parties, in writing;




<PAGE>   63

             13.1.2 By ONB (unless ONB's Board of Directors shall have withdrawn
or modified in a manner adverse to CVB in any respect its recommendation of the
Merger to the holders of ONB Stock) or CVB immediately upon the failure of the
shareholders of ONB or CVB to give the requisite approval of this Agreement;

             13.1.3 By ONB immediately upon expiration of 30 days from delivery
of written notice by ONB to CVB of CVB's breach of or failure to satisfy any
covenant or agreement contained herein resulting in a material impairment of the
benefit reasonably expected to be derived by ONB from the performance or
satisfaction of such covenant or agreement (provided that such breach has not
been waived by ONB or cured by CVB prior to expiration of such 30-day period);

             13.1.4 By CVB immediately upon expiration of 30 days from delivery
of written notice by CVB to ONB of ONB's breach of or failure to satisfy any
covenant or agreement contained herein resulting in a material impairment of the
benefit reasonably expected to be derived by CVB from the performance or
satisfaction of such covenant or agreement (provided that such breach has not
been waived by CVB or cured by ONB prior to expiration of such 30-day period);

             13.1.5 By ONB or CVB upon the expiration of 30 days after any
Governmental Entity denies or refuses to grant any approval, consent or
authorization required to be obtained in order to consummate the transactions
contemplated by this Agreement unless, within said 30-day period after such
denial or refusal, all parties hereto agree to submit the application to the
regulatory authority that has denied, or refused to grant the approval, consent
or qualification requested;

             13.1.6 By ONB or CVB if any conditions set forth in Article 9 shall
not have been met by March 31, 2000; provided, however, that this Agreement
shall not be terminated pursuant to this Section 13.1.6 if the relevant
condition shall have failed to occur as a result of any act or omission of the
party seeking to terminate.

             13.1.7 By ONB if any of the conditions set forth in Article 10
shall not have been met, or by CVB if any of the conditions set forth in Article
11 shall not have been met, by March 31, 2000, or such earlier time as it
becomes apparent that such condition shall not be met, provided, however, that
this Agreement shall not be terminated pursuant to this Section 13.1.7 if the
relevant condition shall have failed to occur as a result of any act or omission
of the party seeking to terminate;

             13.1.8 By CVB if ONB shall have breached Section 6.1.14; or

             13.1.9 By CVB under the circumstances set forth in Section 8.3.

        13.2 Termination Date. This Agreement shall be terminated if the Closing
Date shall not have occurred by March 31, 2000, unless extended in writing by
the parties, provided, however, that this Agreement shall not terminate by
operation of this Section 13.2 as a result of any act or omission of the party
seeking to terminate.




<PAGE>   64

        13.3 Effect of Termination. In the event of termination of this
Agreement by either ONB or CVB as provided in Section 13.1, neither ONB nor CVB
shall have any further obligation or liability to the other party except (a)
with respect to the last sentences of each of Section 6.3.1, Section 7.3 and
Section 8.3, (b) with respect to Sections 14.1 and 14.2, (c) to the extent such
termination results from a party's willful and material breach of the warranties
and representations made by it, or willful and material failure in performance
of any of its covenants, agreements or obligations hereunder; and (d) as
provided in the Stock Option Agreement, attached hereto as Exhibit A, which is
governed by its own terms as to termination.

        13.4 Force Majeure. ONB and CVB agree that, notwithstanding anything to
the contrary in this Agreement, in the event this Agreement is terminated as a
result of a failure of a condition, which failure is due to a natural disaster
or other act of God, or an act of war, and provided neither party has materially
failed to observe the obligations of such party under this Agreement, neither
party shall be obligated to pay to the other party to this Agreement any
expenses or otherwise be liable hereunder.


                                  ARTICLE 14.

                                  MISCELLANEOUS

        14.1 Expenses.

             14.1.1 CVB hereby agrees that if this Agreement is terminated by
ONB pursuant to Section 13.1.3, CVB shall promptly and in any event within 10
days after such termination pay ONB all Expenses (as defined in Section 14.1.4
below) of ONB, but not to exceed $225,000.

             14.1.2 ONB hereby agrees that if the Agreement is terminated by CVB
or ONB pursuant to Section 13.1.2 with respect to the failure of ONB
shareholders to approve the Agreement and the transactions contemplated hereby,
or by CVB pursuant to Section 13.1.4, Section 13.1.8 or Section 13.1.9, ONB
shall promptly and in any event within 10 days after such termination pay CVB
all Expenses of CVB, but not to exceed $300,000.

             14.1.3 Except as otherwise provided herein, all Expenses incurred
by CVB and ONB in connection with or related to the authorization, preparation
and execution of this Agreement, the solicitation of shareholder approvals and
all other matters related to the closing of the transactions contemplated
hereby, including, without limitation of the generality of the foregoing, all
fees and expenses of agents, representatives, counsel and accountants employed
by either such party or its affiliates, shall be borne solely and entirely by
the party which has incurred the same. Notwithstanding the foregoing, CVB and
ONB shall share equally the cost of printing the Proxy Statement and Prospectus.

             14.1.4 "Expenses" as used in this Agreement shall include all
reasonable out-of-pocket expenses (including all fees and expenses of attorneys,
accountants, investment bankers, experts and consultants to the party and its
affiliates) incurred by the party or on its behalf in connection with the
consummation of the transactions contemplated by this Agreement.




<PAGE>   65


        14.2 Notices. Any notice, request, instruction or other document to be
given hereunder by any party hereto to another shall be in writing and delivered
personally or by confirmed facsimile transmission or sent by registered or
certified mail, postage prepaid, with return receipt requested, addressed as
follows:

               To CVB:                 CVB Financial Corp.
                                       701 North Haven Avenue
                                       Ontario, California  91764
                                       Attention:  D. Linn Wiley
                                       Facsimile Number:  (909) 481-2130

               With a copy to:         Manatt, Phelps & Phillips, LLP
                                       11355 West Olympic Boulevard
                                       Los Angeles, California 90064
                                       Attention:  William T. Quicksilver, Esq.
                                       Facsimile Number:  (310) 312-4224

               To ONB:                 Orange National Bancorp
                                       1201 East Katella Avenue
                                       Orange, California  92867
                                       Attention:  Kenneth J. Cosgrove
                                       Facsimile Number:  (714) 289-2310

               With a copy to:         Brobeck, Phleger & Harrison, LLP
                                       Spear Street Tower
                                       One Market
                                       Attention:  J. Michael Shepherd, Esq.
                                       Facsimile Number:  (415) 442-1010

             Any such notice, request, instruction or other document shall be
deemed received (i) on the date delivered personally or delivered by confirmed
facsimile transmission, (ii) on the next Business Day after it was sent by
overnight courier, postage prepaid; or (iii) on the third Business Day after it
was sent by registered or certified mail, postage prepaid. Any of the persons
shown above may change its address for purposes of this section by giving notice
in accordance herewith.

        14.3 Successors and Assigns. All terms and conditions of this Agreement
shall be binding upon and shall inure to the benefit of the parties hereto and
their respective transferees, successors and assigns; provided, however, that
this Agreement and all rights, privileges, duties and obligations of the parties
hereto may not be assigned or delegated by any party hereto and any such
attempted assignment or delegation shall be null and void.

        14.4 Counterparts. This Agreement and any exhibit hereto may be executed
in one or more counterparts, all of which, taken together, shall constitute one
original document and shall become effective when one or more counterparts have
been signed by the appropriate parties and delivered to each party hereto.




<PAGE>   66

        14.5 Effect of Representations and Warranties. The representations and
warranties contained in this Agreement or in any List shall terminate
immediately after the Effective Time of the Merger.

        14.6 Third Parties. Each party hereto intends that this Agreement shall
not benefit or create any right or cause of action to any person other than
parties hereto. As used in this Agreement the term "parties" shall refer only to
CVB and ONB as the context may require.

        14.7 Lists; Exhibits; Integration. Each List, exhibit and letter
delivered pursuant to this Agreement shall be in writing and shall constitute a
part of the Agreement, although Lists and letters need not be attached to each
copy of this Agreement. This Agreement, together with such Lists, exhibits and
letters, constitutes the entire agreement between the parties pertaining to the
subject matter hereof and supersedes all prior agreements and understandings of
the parties in connection therewith.

        14.8 Knowledge. Whenever any statement herein or in any list,
certificate or other document delivered to any party pursuant to this Agreement
is made "to the knowledge" or "to the best knowledge" of any party or another
Person, such party or other Person shall make such statement only after
conducting an investigation reasonable under the circumstances of the subject
matter thereof, and each such statement shall constitute a representation that
such investigation has been conducted.

        14.9 Governing Law. This Agreement is made and entered into in the State
of California, except to the extent that the provisions of federal law are
mandatorily applicable, and the laws of the State of California shall govern the
validity and interpretation hereof and the performance of the parties hereto of
their respective duties and obligations hereunder.

        14.10 Captions. The captions contained in this Agreement are for
convenience of reference only and do not form a part of this Agreement and shall
not affect the interpretation hereof.

        14.11 Severability. If any portion of this Agreement shall be deemed by
a court of competent jurisdiction to be unenforceable, the remaining portions
shall be valid and enforceable only if, after excluding the portion deemed to be
unenforceable, the remaining terms hereof shall provide for the consummation of
the transactions contemplated herein in substantially the same manner as
originally set forth at the date this Agreement was executed.

        14.12 Waiver and Modification; Amendment. No waiver of any term,
provision or condition of this Agreement and the Agreement of Bank Merger,
whether by conduct or otherwise, in any one or more instances, shall be deemed
to be or construed as a further or continuing waiver of any such term, provision
or condition of this Agreement. Except as otherwise required by law, this
Agreement and the Agreement of Merger and the Agreement of Bank Merger, when
executed and delivered, may be modified or amended by action of the Boards of
Directors of CVB and ONB, and by CBB and Orange, respectively, without action by
their respective shareholders. This Agreement may be modified or amended only by
an instrument of equal formality signed by the parties or their duly authorized
agents.




<PAGE>   67


        14.13 Attorneys' Fees. If any legal action or any arbitration upon
mutual agreement is brought for the enforcement of this Agreement or because of
an alleged dispute, controversy, breach, or default in connection with this
Agreement, the prevailing party shall be entitled to recover reasonable
attorneys' fees and other costs and expenses incurred in that action or
proceeding, in addition to any other relief to which it may be entitled.

             IN WITNESS WHEREOF, the parties to this Agreement have duly
executed this Agreement as of the day and year first above written.



ATTEST:                                 CVB FINANCIAL CORP


                                        By  /s/ D. Linn Wiley
- ------------------------                   -----------------------------------
                                        D. Linn Wiley
Secretary                               President and Chief Executive Officer



ATTEST:                                 ORANGE NATIONAL BANCORP


                                        By  /s/ Kenneth Cosgrove
- ------------------------                   -----------------------------------
                                        Kenneth Cosgrove
Secretary                               President and Chief Executive Officer


<PAGE>   68


                                  EXHIBIT LIST



A       AGREEMENT OF MERGER

B       AGREEMENT OF BANK MERGER

C       FORM OF AFFILIATE'S AGREEMENT

D       STOCK OPTION AGREEMENT

E       FORM OF NONCOMPETITION AGREEMENT

F       FORM OF SHAREHOLDER'S AGREEMENT




<PAGE>   1


                                  EXHIBIT 10.1




                             STOCK OPTION AGREEMENT
                        THE TRANSFER OF THIS AGREEMENT IS
                     SUBJECT TO CERTAIN PROVISIONS CONTAINED
                   HEREIN AND TO RESALE RESTRICTIONS UNDER THE
                     SECURITIES ACT OF 1933, AS AMENDED, AND
                        APPLICABLE STATE SECURITIES LAWS


                             STOCK OPTION AGREEMENT


               This Stock Option Agreement, dated as of May 18, 1999 (the
"Agreement"), is made by and between Orange National Bancorp, a California
corporation ("Issuer"), and CVB Financial Corp., a California corporation
("Grantee").

               WHEREAS, Grantee and Issuer have entered into an Agreement and
Plan of Reorganization dated May 18, 1999 (the "Reorganization Agreement"),
providing for, among other things, the merger of Issuer with and into Grantee
(the "Merger"), with Grantee being the surviving corporation; and

               WHEREAS, as a condition and inducement to Grantee's execution of
the Reorganization Agreement, Issuer has agreed to grant to Grantee the Option
(as defined below).

               NOW, THEREFORE, in consideration of the foregoing and the
respective representations, warranties, covenants and agreements set forth
herein and in the Reorganization Agreement, and intending to be legally bound
hereby, Issuer and Grantee agree as follows:

        1. Defined Terms. Capitalized terms which are used but not defined
herein shall have the meanings ascribed to such terms in the Reorganization
Agreement. As used in this Agreement, the following terms shall have the
meanings indicated:

                             (a) "Exchange Act" means the Securities Exchange
               Act of 1934, as amended.

                             (b) "Federal Reserve Board" means the Board of
               Governors of the Federal Reserve System.

                             (c) "Holder" means Grantee and, to the extent
               Grantee has assigned its rights and obligations under this
               Agreement as permitted herein, any subsidiary or direct or
               indirect transferee of Grantee.




<PAGE>   2


                             (d) "Person" shall have the meaning specified in
               Sections 3(a)(9) and 13(d)(3) of the Exchange Act and the rules
               and regulations thereunder.

                             (e) "Securities Act" means the Securities Act of
               1933, as amended.

        2. Grant of Option. Subject to the terms and conditions set forth
herein, Issuer hereby grants to Grantee an irrevocable option (the "Option") to
purchase up to 399,834 shares (the "Option Shares") of Common Stock, no par
value ("Issuer Common Stock"), of Issuer at a purchase price per Option Share of
$ 27.00 (the "Purchase Price"), but in no event shall the number of Option
Shares exceed 19.9% of the issued and outstanding shares of Issuer Common Stock.
The Purchase Price and the number of Option Shares that may be received upon the
exercise of the Option are subject to adjustment as set forth below.

        3. Exercise of Option.

                             (a) The Holder may exercise the Option, in whole or
               in part, at any time and from time to time but only following the
               occurrence of a Purchase Event (as defined below); provided that
               the Option shall terminate and be of no further force and effect
               upon the earliest to occur of (such earliest date the "Expiration
               Date"):

                                           (i) the Effective Time of the Merger;
                             or

                                           (ii) 15 months after the first
                             occurrence of a Purchase Event; or

                                           (iii) 15 months after the termination
                             of the Reorganization Agreement on or following the
                             occurrence of a Preliminary Purchase Event (as
                             defined below) or Purchase Event or a termination
                             by Grantee pursuant to Section 13.1.4 or 13.1.8 of
                             the Reorganization Agreement; or

                                           (iv) termination of the
                             Reorganization Agreement in accordance with the
                             terms thereof prior to the occurrence of a Purchase
                             Event or a Preliminary Purchase Event other than a
                             termination by Grantee pursuant to Section 13.1.4
                             or 13.1.8 of the Reorganization Agreement.

Notwithstanding anything to the contrary contained herein, any purchase of
shares upon exercise of the Option shall be subject to compliance with
applicable law, including, without limitation, the Bank Holding Company Act of
1956, as amended.

                             (b) As used herein, a "Purchase Event" means any of
               the following events:




<PAGE>   3

                                            (i) The Board of Directors of Issuer
                             shall have approved, or recommended to the Issuer's
                             shareholders that they approve, a proposal received
                             by Issuer from a person (other than Grantee or any
                             subsidiary of Grantee) to effect an Acquisition
                             Transaction (as defined below), Tender Offer (as
                             defined below) or Exchange Offer (as defined
                             below); or

                                            (ii) Issuer, without having received
                             Grantee's prior written consent, shall have entered
                             into an agreement with any person (other than
                             Grantee or any subsidiary of Grantee) to effect an
                             Acquisition Transaction; or

                                            (iii) any person (other than Grantee
                             or any subsidiary of Grantee) shall have acquired
                             beneficial ownership (as such term is defined in
                             Rule 13d-3 promulgated under the Exchange Act) of
                             or the right to acquire beneficial ownership of, or
                             any "group" (as such term is defined under the
                             Exchange Act and the rules and regulations
                             promulgated thereunder) shall have been formed
                             which beneficially owns or has the right to acquire
                             beneficial ownership of twenty percent (20%) or
                             more of the then outstanding shares of Issuer
                             Common Stock.

As used herein, the term "Acquisition Transaction" shall mean (A) a merger,
consolidation or similar transaction involving Issuer or any of its subsidiaries
(other than internal mergers, reorganizations, consolidations or dissolutions
involving only Issuer and/or existing subsidiaries and other than a merger,
consolidation or similar transaction in which the common shareholders of Issuer
immediately prior thereto in the aggregate own at least seventy-five percent
(75%) of the common stock of the surviving or successor corporation immediately
after the consummation thereof), (B) the disposition, by sale, lease, exchange
or otherwise, of twenty (20%) or more of the consolidated assets or deposit
liabilities of Issuer and its subsidiaries, or (C) a purchase or other
acquisition (including by way of merger, consolidation, share exchange or any
similar transaction), other than by Issuer or its subsidiaries, of securities
representing twenty percent (20%) or more of the voting power of Issuer or any
of its subsidiaries.

                             (c) As used herein, a "Preliminary Purchase Event"
               means any of the following events:

                                            (i) any person (other than Grantee
                             or any subsidiary of Grantee) shall have acquired
                             beneficial ownership of, or the right to acquire
                             beneficial ownership of, or any "group" (as defined
                             under the Exchange Act and the rules and
                             regulations thereunder) shall have been formed
                             which beneficially owns or has the right to acquire
                             beneficial ownership of, ten percent (10%) or more
                             of the then outstanding shares of Issuer Common
                             Stock; or

                                            (ii) any person (other than Grantee
                             or any subsidiary of Grantee) shall have commenced
                             (as such term is



<PAGE>   4

                             defined in Rule 14d-2 under the Exchange Act), or
                             shall have filed a registration statement under the
                             Securities Act with respect to, a tender offer or
                             exchange offer to purchase any shares of Issuer
                             Common Stock such that, upon consummation of such
                             offer, such person would own or control ten percent
                             (10%) or more of the then outstanding shares of
                             Issuer Common Stock (such an offer being referred
                             to herein as a "Tender Offer" or an "Exchange
                             Offer", respectively); or

                                            (iii) Issuer, without having
                             received Grantee's prior written consent, shall
                             have entered into an agreement with any person
                             (other than Grantee or any subsidiary of Grantee)
                             with respect to, or the Board of Directors of
                             Issuer shall have recommended that the shareholders
                             of Issuer approve or accept, a purchase or other
                             acquisition (including by way of merger,
                             consolidation, share exchange or any similar
                             transaction), other than by Issuer or its
                             subsidiaries, representing ten percent (10%) or
                             more of the voting power of Issuer or any of its
                             subsidiaries; or

                                            (iv) any person (other than Grantee
                             or any subsidiary of Grantee) shall have filed an
                             application or notice with the Federal Reserve
                             Board or other federal or state regulatory
                             authority, which application or notice has been
                             accepted for processing, for approval to engage in
                             an Acquisition Transaction; or

                                            (v) the holders of Issuer Common
                             Stock shall not have approved the Reorganization
                             Agreement at the meeting of such shareholders held
                             for the purpose of voting on the Reorganization
                             Agreement, such meeting shall not have been held or
                             shall have been canceled prior to termination of
                             the Reorganization Agreement, or Issuer's Board of
                             Directors shall have withdrawn or modified in a
                             manner adverse to Grantee the recommendation of
                             Issuer's Board of Directors with respect to the
                             Reorganization Agreement, in each case after it
                             shall have been publicly announced that any person
                             (other than Grantee or any subsidiary of Grantee)
                             shall have (A) made or disclosed an intention to
                             make a proposal to engage in an Acquisition
                             Transaction or (B) commenced a Tender Offer or
                             filed a registration statement under the Securities
                             Act with respect to an Exchange Offer.

                             (d) Issuer shall notify Grantee promptly in writing
               of the occurrence of any Purchase Event or Preliminary Purchase
               Event; provided, however, such notice shall not be a condition to
               the right of the Holder to exercise the Option.




<PAGE>   5

                             (e) In the event Holder wishes to exercise the
               Option, it shall send to Issuer a written notice (dated the date
               on which it is sent to Issuer, which date is referred to as the
               "Notice Date") specifying (i) the total number of Option Shares
               it intends to purchase pursuant to such exercise and (ii) a date
               not earlier than three (3) business days nor later than fifteen
               (15) business days from the Notice Date for the closing (the
               "Closing") of such purchase (the "Closing Date"). The Closing
               shall be held at the Issuer's principal office or at such other
               place as Issuer and Holder may agree. If prior notification to or
               approval of the Federal Reserve Board or any other regulatory
               authority is required as a condition precedent to such purchase,
               then (A) Holder shall promptly file and process the required
               notice or application for approval; (B) Issuer shall cooperate
               with Holder in the filing of the required notice or application
               for approval and the obtaining of any such approval; and (C) the
               Closing Date shall be subject to extension for such period of
               time, not to exceed six (6) months, as may be necessary to permit
               the Holder to submit such filing to, and, if necessary, to obtain
               such approval from, the Federal Reserve Board or other applicable
               regulatory authority; provided, however, that the notice of
               Option exercise and such governmental filing must be made, and
               the Notice Date must be, no later than the date on which the
               Option would otherwise terminate. Any exercise of the Option
               shall be deemed to have occurred on the Notice Date.

            4. Payment and Delivery of Certificates.

                             (a) On each Closing Date, Holder shall (i) pay to
               Issuer, in immediately available funds by wire transfer to a bank
               account designated by Issuer, an amount equal to the Purchase
               Price multiplied by the number of Option Shares to be purchased
               on such Closing Date and (ii) present and surrender this
               Agreement to the Issuer at the address of the Issuer specified in
               Section 12(g) hereof.

                             (b) At each Closing, simultaneously with the
               delivery of immediately available funds and surrender of this
               Agreement as provided in Section 4(a), (i) Issuer shall deliver
               to Holder (A) a certificate or certificates representing the
               Option Shares to be purchased at such Closing, which Option
               Shares shall be free and clear of all liens, claims, charges and
               encumbrances of any kind whatsoever, and (B) if the Option is
               exercised in part only, an executed new agreement with the same
               terms as this Agreement evidencing the right to purchase the
               balance of the shares of Issuer Common Stock purchasable
               hereunder; and (ii) Holder shall deliver to Issuer a letter
               agreeing that Holder shall not offer to sell or otherwise dispose
               of such Option Shares in violation of the provisions of this
               Agreement or applicable state and federal securities laws.

                             (c) Certificates for the Option Shares delivered at
               each Closing shall be endorsed with a restrictive legend which
               shall read substantially as follows:




<PAGE>   6


               THE SECURITIES EVIDENCED BY THIS CERTIFICATE HAVE NOT BEEN
               REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE
               "ACT") OR QUALIFIED OR REGISTERED UNDER THE SECURITIES LAWS OF
               ANY STATE. THEY MAY NOT BE SOLD OR TRANSFERRED EXCEPT PURSUANT TO
               AN EFFECTIVE REGISTRATION STATEMENT UNDER THE ACT AND UNTIL THEY
               HAVE BEEN QUALIFIED OR REGISTERED UNDER APPLICABLE STATE
               SECURITIES LAWS, UNLESS THE ISSUER RECEIVES AN OPINION OF COUNSEL
               FOR THE HOLDER OF THESE SECURITIES, REASONABLY SATISFACTORY TO
               THE ISSUER, STATING THAT SUCH SALE OR TRANSFER IS EXEMPT FROM THE
               REGISTRATION AND PROSPECTUS DELIVERY REQUIREMENTS OF THE ACT AND
               ANY APPLICABLE STATE SECURITIES LAWS. THE TRANSFER OF THE
               SECURITIES REPRESENTED BY THIS CERTIFICATE IS ALSO SUBJECT TO
               RESALE RESTRICTIONS ARISING UNDER THE TERMS OF A STOCK OPTION
               AGREEMENT DATED AS OF MAY 18, 1999, A COPY OF WHICH IS AVAILABLE
               FOR INSPECTION AT THE OFFICE OF THE SECRETARY OF THE ISSUER.

It is understood and agreed that the above legend shall be removed by delivery
of substitute certificate(s) without such legend if 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 and its counsel, to the
effect that such legend is not required for purposes of the Securities Act or
applicable state securities laws.

        5. Representations and Warranties and Covenants of Issuer. Issuer hereby
represents and warrants to Grantee as follows:

                             (a) Due Authorization. Issuer has all requisite
               corporate power and authority to enter into this Agreement and,
               subject to any approvals referred to herein, to consummate the
               transactions contemplated hereby. The execution and delivery of
               this Agreement and the consummation of the transactions
               contemplated hereby have been duly authorized by all necessary
               corporate action on the part of Issuer. This Agreement has been
               duly executed and delivered by Issuer and constitutes a binding
               agreement of Issuer enforceable against Issuer in accordance with
               its terms, except as the enforceability hereof may be limited by
               bankruptcy, insolvency, moratorium or other similar laws
               affecting the rights of creditors generally or by equitable
               principles, whether such enforcement is sought in law or equity.

                             (b) Authorized Stock. 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 until the
               obligation to deliver Issuer Common Stock upon the exercise of
               the Option terminates, will have reserved for issuance, upon
               exercise of the




<PAGE>   7

               Option, shares of Issuer Common Stock necessary for Holder to
               exercise the Option, and Issuer will take all necessary corporate
               action to authorize and reserve for issuance all additional
               shares of Issuer Common Stock or other securities which may be
               issued pursuant to Section 7 upon exercise of the Option. The
               shares of Issuer Common Stock to be issued upon due exercise of
               the Option, including all additional shares of Issuer Common
               Stock or other securities which may be issuable pursuant to
               Section 7, upon issuance pursuant hereto, shall be duly and
               validly issued, fully paid and nonassessable, and shall be
               delivered free and clear of all liens, claims, charges and
               encumbrances of any kind or nature whatsoever, including any
               preemptive rights of any stockholder of Issuer.

                             (c) No Conflict The execution and delivery by
               Issuer of this Agreement and the consummation of the transactions
               contemplated hereby do not and will not violate or conflict with
               Issuer's Articles of Incorporation or Bylaws, or any statute,
               regulation, judgment, order, writ, decree or injunction
               applicable to Issuer (other than as may be effected by Grantee's
               ownership of Issuer Common Stock exceeding certain limits set
               forth by statute or regulation) or its properties or assets and
               do not and will not violate, conflict with, result in a breach
               of, constitute a default (or an event which with due notice
               and/or lapse of time would constitute a default) under, result in
               a termination of, accelerate the performance required by, or
               result in the creation of any lien, pledge, security interest,
               charge or other encumbrance upon any of the properties or assets
               of Issuer under the terms, conditions or provisions of any note,
               bond, mortgage, indenture, deed of trust, or loan agreement or
               other agreement, instrument or obligation to which Issuer is a
               party, or by which Issuer or any of its properties or assets may
               be bound or affected.

                             (d) Observance of Covenants. Issuer agrees that it
               will not, by amendment of its Articles of Incorporation 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.

                             (e) Compliance. Issuer shall promptly take all
               action as may from time to time be required (including, complying
               with all premerger notification, reporting and waiting period
               requirements of any federal or state regulatory authority, as
               necessary, before the Option may be exercised, and cooperating
               fully with Holder in preparing such applications or notices and
               providing such information to the Federal Reserve Board, the
               Office of the Comptroller of the Currency, the Federal Deposit
               Insurance Corporation, the Department of Financial Institutions
               or any other regulatory authority as they may require) in order
               to permit Grantee to exercise the Option and Issuer duly and
               effectively to issue shares of Common Stock pursuant hereto, and
               to protect the rights of Grantee against dilution.

        6. Representations and Warranties of Grantee. Grantee hereby represents
and warrants to Issuer that:




<PAGE>   8

                      Purchase Not for Distribution. This Option is not being,
                      and any Option Shares or other securities acquired by
                      Grantee upon exercise of the Option will not be, acquired
                      with a view to the public distribution thereof and will
                      not be transferred or otherwise disposed of except in a
                      transaction registered or exempt from registration under
                      the Securities Act and applicable state securities laws.

            7. Adjustment Upon Changes in Capitalization, etc.

                             (a) In the event of any change in Issuer Common
               Stock by reason of a stock dividend, stock split, split-up,
               recapitalization, combination, exchange of shares or similar
               transaction, the type and number of shares or securities subject
               to the Option, and the Purchase Price therefor, shall be adjusted
               appropriately, and proper provision shall be made in the
               documentation pertaining to such transaction so that Holder shall
               receive, upon exercise of the Option, the number and class of
               shares or other securities or property that Holder would have
               received in respect of Issuer Common Stock if the Option had been
               exercised immediately prior to such event, or the record date
               therefor, as applicable. If any additional shares of Issuer
               Common Stock are issued after the date of this Agreement (whether
               upon exercise of stock options or otherwise but excluding any
               issuance pursuant to an event described in the first sentence of
               this Section 7(a)), the number of shares of Issuer Common Stock
               subject to the Option shall be adjusted so that, after such
               issuance, such number of shares, together with any shares of
               Issuer Common Stock previously issued pursuant hereto, equals
               nineteen and nine-tenths percent (19.9%) of the number of shares
               of Issuer Common Stock then issued and outstanding, without
               giving effect to any shares subject to or issued pursuant to the
               Option (with any fractional share being rounded up to the next
               full share). Issuer agrees that in no event shall the number of
               shares of Issuer Common Stock issued after the date of this
               Agreement pursuant to the preceding sentence, together with the
               number of shares of Issuer Common Stock subject to the Option,
               adjusted as aforesaid, exceed the number of available authorized
               but unissued and unreserved shares of Issuer Common Stock.
               Nothing contained in this Section 7(a) or elsewhere in this
               Agreement shall be deemed to authorize Issuer to issue shares in
               breach of any provision of the Reorganization Agreement.

                             (b) In the event that Issuer shall, prior to the
               occurrence of an event set forth in Section 3(a) terminating the
               Holder's right to exercise the Option, enter into an agreement
               (i) to consolidate with or merge into any person, other than
               Grantee or one of its subsidiaries, and shall not be the
               continuing or surviving corporation of such consolidation or
               merger, (ii) to permit any person, other than Grantee or one of
               its subsidiaries, to merge into Issuer and Issuer shall be the
               continuing or surviving corporation, but, in connection with such
               merger, the then outstanding shares of Issuer Common Stock shall
               be changed into or exchanged for stock or other securities of
               Issuer or any other person or cash or any other property or the
               outstanding shares of Issuer Common Stock immediately prior to
               such merger shall after such merger represent less than fifty




<PAGE>   9

               percent (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 consolidated assets or deposit
               liabilities to any person other than Grantee or one of its
               subsidiaries, then, and in each such case, the agreement
               governing such transaction shall make proper provisions so that
               the Option shall, upon the consummation of any such transaction
               and upon the terms and conditions set forth herein, be converted
               into, or exchanged for, an option (the "Substitute Option"), at
               the, election of Grantee, of either (A) the Acquiring Corporation
               (as defined below), (B) any person that controls the Acquiring
               Corporation, (such person being referred to as the "Substitute
               Option Issuer"), or (C) in the case of a merger described in
               clause (ii), Issuer.

                             (c) The Substitute Option shall have the same terms
               as the Option, provided that if the terms of the Substitute
               Option cannot, for legal reasons, be the same as the Option, such
               terms shall be as similar as possible and in no event less
               advantageous to Grantee. The Substitute Option Issuer shall also
               enter into an agreement with the then holder or holders of the
               Substitute Option in substantially the same form as this
               Agreement (after giving effect for such purposes to the
               provisions of this Agreement), which shall be applicable to the
               Substitute Option.

                             (d) The Substitute Option shall be exercisable for
               such number of shares of the Substitute Common Stock (as is
               hereinafter defined) as is equal to the Assigned Value (as is
               hereinafter defined) multiplied by the number of shares of the
               Issuer Common Stock for which the Option was theretofore
               exercisable, divided by the Average Price (as is hereinafter
               defined). The exercise price of the Substitute Option per share
               of the Substitute Common Stock (the "Substitute Purchase Price")
               shall then be equal to the Purchase Price multiplied by a
               fraction in which the numerator is the number of shares of the
               Issuer Common Stock for which the Option was theretofore
               exercisable and the denominator is the number of shares of the
               Substitute Common Stock for which the Substitute Option is
               exercisable.

                             (e) As used herein, the following terms have the
               meanings indicated:

                                            (i) "Acquiring Corporation" shall
                             mean (A) the continuing or surviving corporation of
                             a consolidation or merger with Issuer (if other
                             than Issuer), (B) Issuer in a merger in which
                             Issuer is the continuing or surviving person, and
                             (C) the transferee of all or any substantial part
                             of the Issuer's assets (or the assets of its
                             subsidiaries).

                                            (ii) "Substitute Common Stock" shall
                             mean the common stock issued by the Substitute
                             Option Issuer upon exercise of the Substitute
                             Option.




<PAGE>   10

                                            (iii) "Assigned Value" shall mean
                             the highest of (A) the price per share of the
                             Issuer Common Stock at which a Tender Offer or
                             Exchange Offer therefor has been made by any person
                             (other than Grantee or a subsidiary of Grantee),
                             (B) the price per share of the Issuer Common Stock
                             to be paid by any person (other than Grantee or a
                             subsidiary of Grantee) pursuant to an agreement
                             with Issuer, and (C) the highest closing price per
                             share of Issuer Common Stock as quoted on the
                             Nasdaq National Market (or if Common Stock is not
                             quoted on the Nasdaq National Market, the highest
                             bid price per share on any day as quoted on the
                             principal trading market or securities exchange on
                             which such shares are traded as reported by a
                             recognized source chosen by Grantee and reasonably
                             acceptable to Issuer) within the six-month period
                             immediately preceding the agreement governing the
                             transaction described in Section 7(b) which gave
                             rise to the Substitute Option; provided, however,
                             that in the event of a sale of less than all of
                             Issuer's consolidated assets or deposit
                             liabilities, the Assigned Value shall be the sum of
                             the price paid in such sale for such assets or
                             deposit liabilities and the current market value of
                             the remaining consolidated net assets of Issuer as
                             determined by a nationally recognized investment
                             banking firm selected by the Holder (or by a
                             majority in interest of the Holders if there shall
                             be more than one Holder (a "Holder Majority")) and
                             reasonably acceptable to Issuer, divided by the
                             number of shares of the Issuer Common Stock
                             outstanding at the time of such sale. In the event
                             that an exchange offer is made for the Issuer
                             Common Stock or an agreement is entered into for a
                             merger or consolidation involving consideration
                             other than cash, the value of the securities or
                             other property issuable or deliverable in exchange
                             for the Issuer Common Stock shall be determined by
                             a nationally recognized investment banking firm
                             selected by Holder (or a Holder Majority) and
                             reasonably acceptable to Issuer.

                                            (iv) "Average Price" shall mean the
                             average closing price of the Substitute Common
                             Stock for the one year immediately preceding the
                             effective date of the consolidation, merger or sale
                             in question, but in no event higher than the
                             closing price of the shares of the Substitute
                             Common Stock on the day preceding such
                             consolidation, merger or sale; provided that if
                             Issuer is the issuer of the Substitute Option, the
                             Average Price shall be computed with respect to a
                             share of common stock issued by Issuer, the person
                             merging into Issuer or by any company which
                             controls or is controlled by such merging person,
                             as Holder may elect.

                             (f) In no event, pursuant to any of the foregoing
               paragraphs, shall the Substitute Option be exercisable for more
               than nineteen and nine-tenths



<PAGE>   11

               percent (19.9%) of the aggregate of the shares of the Substitute
               Common Stock outstanding prior to exercise of the Substitute
               Option (with any fractional share being rounded up to the next
               full share). In the event that the Substitute Option would be
               exercisable for more than 19.9% of the aggregate of the shares of
               the Substitute Common Stock but for this clause (f), the
               Substitute Option Issuer shall make a cash payment to Grantee
               equal to the excess of (i) the value of the Substitute Option
               without giving effect to the limitation in this clause (f) over
               (ii) the value of the Substitute Option after giving effect to
               the limitation in this clause (f). The difference in value shall
               be determined by a nationally recognized investment banking firm
               selected by Grantee and reasonably acceptable to the Substitute
               Option Issuer, whose determination shall be conclusive and
               binding on the parties.

                             (g) Issuer shall not enter into any transaction
               described in subsection (b) of this Section 7 unless the
               Acquiring Corporation and any person that controls the Acquiring
               Corporation assume in writing all the obligations of Issuer
               hereunder and take all other actions that may be necessary so
               that the provisions of this Section 7 are given full force and
               effect (including, without limitation, any action that may be
               necessary so that the shares of Substitute Common Stock are in no
               way distinguishable from or have lesser economic value than other
               shares of common stock issued by the Substitute Option Issuer).

                             (h) At the written request of Holder delivered to
               the Substitute Option Issuer prior to the occurrence of an event
               set forth in Section 3(a) above terminating the Substitute
               Option, the Substitute Option Issuer shall repurchase from Holder
               (i) the Substitute Option and/or (ii) all Substitute Common Stock
               theretofore purchased by Holder pursuant hereto with respect to
               which Holder then has beneficial ownership. The date on which
               Holder exercises its rights under this Section 7(h) is referred
               to as the "Substitute Option Request Date." Such repurchase shall
               be at an aggregate price (the "Substitute Option Repurchase
               Consideration") equal to the sum of (A) the excess, if any, of
               (1) the Highest Closing Price (as defined below) for each share
               of Substitute Common Stock over (2) the Substitute Purchase Price
               per share of Substitute Common Stock, multiplied by the number of
               shares of Substitute Common Stock for which the Substitute Option
               may then be exercised and as to which Holder has exercised its
               repurchase right hereunder, plus (B) the Highest Closing Price
               for each share of Substitute Common Stock, multiplied by the
               number of shares of Substitute Common Stock previously acquired
               by Holder upon exercise of the Option or Substitute Option and as
               to which Holder has exercised its repurchase right hereunder. The
               term "Highest Closing Price" shall mean the highest closing price
               per share of Substitute Common Stock on the Nasdaq National
               Market (or, if Substitute Common Stock is not quoted on the
               Nasdaq National Market, the highest bid price per share on any
               day as quoted on the principal trading market or securities
               exchange on which such shares are traded as reported by a
               recognized source chosen by Grantee and reasonably acceptable to
               Issuer) or, if such shares are not traded in a trading market or
               listed on an exchange, as quoted by the brokerage firms acting as
               market makers for the Substitute Common Stock prior




<PAGE>   12

               to the trading or listing of the Substitute Common Stock on any
               national securities exchange and thereafter as reported by the
               principal trading market or securities exchange on which such
               shares are traded, during the sixty (60) business days preceding
               the Substitute Option Request Date.

                             (i) The provisions of Sections 8(b), 8(c), 11 and
               12 shall apply, with appropriate adjustments, to any securities
               for which the Option becomes exercisable pursuant to this Section
               7 and as applicable, references in such sections to "Issuer",
               "Option", "Purchase Price", "Issuer Common Stock", "Repurchase
               Consideration", and "Request Date" shall be deemed to be
               references to "Substitute Option Issuer", "Substitute Option",
               "Substitute Purchase Price", "Substitute Common Stock",
               "Substitute Option Repurchase Consideration", and "Substitute
               Option Request Date", respectively.

            8. Repurchase at the Option of Grantee.

                             (a) At any time after the first occurrence of a
               Repurchase Event (as defined in Section 8(e) below), at the
               written request of Holder delivered to Issuer prior to the
               occurrence of an event set forth in Section 3(a) above
               terminating the Option, Issuer shall repurchase from Holder (i)
               the Option and (ii) all Option Shares theretofore purchased by
               Holder pursuant hereto with respect to which Holder then has
               beneficial ownership. The date on which Holder exercises its
               rights under this Section 8 is referred to as the "Request Date."
               Such repurchase shall be at an aggregate price (the "Repurchase
               Consideration") equal to the sum of:

                                            (i) the aggregate Purchase Price
                             paid by Holder for any Option Shares acquired
                             pursuant to the Option with respect to which Holder
                             then has beneficial ownership;

                                            (ii) the excess, if any, of (A) the
                             Applicable Price (as defined below) for each Option
                             Share over (B) the Purchase Price per Option Share
                             (subject to adjustment pursuant to Section 7(a)),
                             multiplied by the number of Option Shares with
                             respect to which the Option has not been exercised;
                             and

                                            (iii) the excess, if any, of the
                             Applicable Price over the Purchase Price (subject
                             to adjustment pursuant to Section 7(a)) paid (or,
                             in the case of Option Shares with respect to which
                             the Option has been exercised but the Closing Date
                             has not occurred, payable) by Holder for each
                             Option Share with respect to which the Option has
                             been exercised and with respect to which Holder
                             then has beneficial ownership, multiplied by the
                             number of such shares.

                             (b) If Holder exercises its rights under this
               Section 8, Issuer shall, within ten (10) business days after the
               Request Date, pay the Repurchase



<PAGE>   13

               Consideration to Holder in immediately available funds, and
               Holder shall surrender to Issuer the Option and the certificates
               evidencing the Option Shares purchased thereunder with respect to
               which Holder then has beneficial ownership and has designated to
               be repurchased, and Holder shall warrant that it has sole record
               and beneficial ownership of such shares and that the same are
               then free and clear of all liens, claims, charges and
               encumbrances of any kind whatsoever.

                             (c) Notwithstanding the provisions hereof to the
               contrary, to the extent that Issuer is prohibited under
               applicable law, regulation or administrative policy from
               repurchasing all or any portion of the Option or Option Shares,
               then (i) Issuer shall promptly give notice of such fact to
               Holder; (ii) Issuer shall, from time to time subject to the last
               sentence of this Section 8(c), deliver to Holder that portion of
               the Repurchase Consideration that it is not then so prohibited
               from paying; (iii) at Holder's request, Issuer shall promptly
               file any required notice or application for approval and
               expeditiously process the same. After Holder's receipt of such
               notice from Issuer, Issuer shall not be in breach of its
               repurchase obligation hereunder to the extent it is or remains,
               despite reasonable efforts to obtain any required approvals,
               legally prohibited from repurchasing the Option or Option Shares.
               Holder shall have the right (A) to revoke its request for
               repurchase with respect to the portion of the Option or Option
               Shares that Issuer is prohibited from repurchasing, (B) to
               require Issuer to deliver to Holder the Option and/or Option
               Shares Issuer is prohibited from repurchasing, and (C) to
               exercise the Option as to the number of Option Shares for which
               the Option was exercisable at the Request Date less the number of
               such Option Shares in respect of which the Repurchase
               Consideration has been lawfully paid. Notwithstanding anything
               herein to the contrary, Issuer shall not be obligated to
               repurchase all or any part of the Option or Option Shares
               pursuant to more than one written request from Holder, except
               that Issuer shall be obligated to repurchase, pursuant to more
               than one written request, any Option or Option Shares in the
               event that Holder (1) has revoked its request for repurchase in
               accordance with the provisions of this Section 8 prior to the
               occurrence of an event set forth in Section 3(a) terminating the
               Holder's right to exercise the Option and (2) has delivered,
               prior to such event, a new written notice requesting a
               repurchase. If an event set forth in Section 3(a) terminating the
               Holder's right to exercise the Option occurs prior to, or is
               scheduled to occur within, sixty (60) days after the date of the
               notice by Issuer described in clause 8(c)(i) above, then,
               notwithstanding the occurrence of such terminating event, Holder
               shall have the right to receive the Repurchase Consideration to
               the extent Issuer is or becomes, within a sixty (60) day period
               from the date of such notice by Issuer, legally permitted to
               repurchase. Except as set forth in the preceding sentence,
               Holder's repurchase rights under this Agreement shall terminate
               concurrently with the termination of Holder's right to exercise
               the Option, pursuant to Section 3(a).

                             (d) For purposes of this Agreement, the "Applicable
               Price" means the highest of (i) the highest price per share of
               Issuer Common Stock paid for any such share by the person or
               groups described in Section 8(e)(i), (ii) the price per share of
               Issuer Common Stock received by holders of Issuer Common




<PAGE>   14

               Stock in connection with any merger or other business combination
               transaction described in Section 7(b)(i), 7(b)(ii) or 7(b)(iii),
               or (iii) the highest bid price per share of Issuer Common Stock
               on the Nasdaq National Market or other principal trading market
               or securities exchange on which such shares are traded as
               reported by a recognized source selected by Holder during the
               sixty (60) business days preceding the Request Date; provided,
               however, that in the event of a sale of less than all of Issuer's
               assets, the Applicable Price shall be the sum of the price paid
               in such sale for such assets or deposit liabilities and the
               current market value of the remaining consolidated net assets of
               Issuer as determined by a nationally recognized investment
               banking firm selected by Holder (or the Holder Majority) and
               reasonably acceptable to Issuer, divided by the number of shares
               of the Issuer Common Stock outstanding at the time of such sale.
               If the consideration to be offered, paid or received pursuant to
               either of the foregoing clauses (i) or (ii) shall be other than
               in cash, the value of such consideration shall be determined in
               good faith by an independent nationally recognized investment
               banking firm selected by Holder (or the Holder Majority) and
               reasonably acceptable to Issuer, which determination shall be
               conclusive for all purposes of this Agreement.

                             (e) As used herein, a "Repurchase Event" shall
               occur if (i) any person (other than Grantee or any subsidiary of
               Grantee) shall have acquired beneficial ownership of (as such
               term is defined in Rule 13d-3 promulgated under the Exchange Act)
               or the right to acquire beneficial ownership of, or any "group"
               (as such term is defined under the Exchange Act and the rules and
               regulations promulgated thereunder) shall have been formed which
               beneficially owns, or has the right to acquire beneficial
               ownership of, fifty percent (50%) or more of the then outstanding
               shares of Issuer Common Stock or (ii) any of the transactions
               described in Section 7(b)(i), 7(b)(ii) or 7(b)(iii) shall be
               consummated.

            9. Registration Rights.

                             (a) Demand Registration Rights. Issuer shall,
               subject to the conditions of Section 9(c) below, if requested by
               any Holder, including Grantee and any permitted transferee
               ("Selling Shareholder"), after exercise of the Option and prior
               to an Expiration Date, expeditiously prepare and file, a
               registration statement under the Securities Act if such
               registration is necessary in order to permit the sale or other
               disposition of any or all shares of Issuer Common Stock or other
               securities that have been acquired by or are issuable to the
               Selling Shareholder upon exercise of the Option in accordance
               with the intended method of sale or other disposition stated by
               the Selling Shareholder in such request, including without
               limitation a "shelf" registration statement under Rule 415 under
               the Securities Act or any successor provision, and Issuer shall
               use its best efforts to qualify such shares or other securities
               for sale under any applicable state securities laws.

                             (b) Additional Registration Rights. If Issuer at
               any time after the exercise of the Option proposes to register
               any shares of Issuer Common Stock under the Securities Act in
               connection with an underwritten public offering




<PAGE>   15

               of such Issuer Common Stock, Issuer will promptly give written
               notice to the Holders of its intention to do so and, upon the
               written request of any Holder given within thirty (30) days after
               receipt of any such notice (which request shall specify the
               number of shares of Issuer Common intended to be included in such
               underwritten public offering by the Holder), Issuer will cause
               all such shares for which a Holder requests participation in such
               registration, to be so registered and included in such
               underwritten public offering; provided, however, that Issuer may
               elect to not cause any such shares to be so registered (i) if the
               underwriters in good faith object for valid business reasons, or
               (ii) in the case of a registration solely to implement an
               employee benefit plan or a registration filed on Form S-4 of the
               Securities Act or any successor form, provided, further, however,
               that such election pursuant to (i) may be only made one time. If
               some but not all the shares of Issuer Common Stock, with respect
               to which Issuer shall have received requests for registration
               pursuant to this Section 9(b), shall be excluded from such
               registration, Issuer shall make appropriate allocation of shares
               to be registered among the Holders desiring to register their
               shares pro rata in the proportion that the number of shares
               requested to be registered by each such Holder bears to the total
               number of shares requested to be registered by all such Holders
               then desiring to have Issuer Common Stock registered for sale.

                             (c) Conditions to Required Registration. Issuer
               shall use all reasonable efforts to cause each registration
               statement referred to in Section 9(a) above to become effective
               and to obtain all consents or waivers of other parties which are
               required therefor and to keep such registration statement
               effective; provided, however, that Issuer may delay any
               registration of Option Shares required pursuant to Section 9(a)
               above for a period not exceeding 90 days if Issuer determines, in
               the good faith exercise of its reasonable business judgment, that
               such registration and offering could adversely effect or
               interfere with bona fide financing plans of Issuer or would
               require disclosure of information, the premature disclosure of
               which could adversely affect Issuer or any transaction under
               active consideration by Issuer. Notwithstanding anything to the
               contrary stated herein, Issuer shall not be required to register
               Option Shares under the Securities Act pursuant to Section 9(a)
               above:

                                            (i) on more than one occasion during
                             any calendar year;

                                            (ii) within 90 days after the
                             effective date of a registration referred to in
                             Section 9(b) above pursuant to which the Holders
                             concerned were afforded the opportunity to register
                             or qualify such shares under the Securities Act and
                             such shares were registered or qualified as
                             requested, and

                                            (iii) unless a request therefor is
                             made to Issuer by Holders that hold at least 25% or
                             more of the aggregate number of Option Shares
                             (including shares of Issuer Common Stock issuable
                             upon exercise of the Option) then outstanding.




<PAGE>   16

In addition to the foregoing, Issuer shall not be required to maintain the
effectiveness of any registration statement after the expiration of nine (9)
months from the effective date of such registration statement. Issuer shall use
all reasonable efforts to make any filings, and take all steps, under all
applicable state securities laws to the extent necessary to permit the sale or
other disposition of the Option Shares so registered in accordance with the
intended method of distribution for such shares; provided, however, that Issuer
shall not be required to consent to the general jurisdiction or qualify to do
business in any state where it is not otherwise required to so consent to such
jurisdiction or to so qualify to do business.

                             (d) Expenses. Except where applicable state law
               prohibits such payments, Issuer will pay the costs of such
               registration or qualification expenses, including without
               limitation registration fees, qualification fees, blue sky fees
               and expenses, Issuer's legal expenses, costs of special audits or
               "cold comfort" letters, expenses of underwriters, excluding
               discounts and commissions, and the reasonable fees and expenses
               of any necessary special experts in connection with each
               registration pursuant to Section 9(a) or (b) above (including the
               related offerings and sales by holders of Option Shares) and all
               other qualifications, notifications, or exemptions pursuant to
               Section 9(a) or 9(b) above.

                             (e) Indemnification. In connection with any
               registration under Section 9(a) or 9(b) above, Issuer hereby
               indemnifies the Selling Shareholders, and each underwriter
               thereof, including each person, if any, who controls such holder
               or underwriter within the meaning of Section 15 of the Securities
               Act, against all expenses, losses, claims, damages and
               liabilities caused by any untrue, or alleged untrue, statement of
               a material fact contained in any registration statement or
               prospectus or notification or offering circular (including any
               amendments or supplements thereto) or any preliminary prospectus,
               or caused by any omission, or alleged omission, to state therein
               a material fact required to be stated therein or necessary to
               make the statements therein not misleading, except insofar as
               such expenses, losses, claims, damages or liabilities of such
               indemnified party are caused by any untrue statement or alleged
               untrue statement that was included by Issuer in any such
               registration statement or prospectus or notification or offering
               circular (including any amendments or supplements thereto) in
               reliance upon, and in conformity with, information furnished in
               writing to Issuer by such indemnified party or any underwriter
               expressly for use therein, and Issuer and each officer, director
               and controlling person of Issuer shall be indemnified by such
               Selling Shareholders, or by such underwriter, as the case may be,
               for all such expenses, losses, claims, damages and liabilities
               caused by any untrue, or alleged untrue, statement, that was
               included by Issuer in any such registration statement or
               prospectus or notification or offering circular (including any
               amendments or supplements thereto) in reliance upon, and in
               conformity with, information furnished in writing to Issuer by
               such holder or such underwriter, as the case may be, expressly
               for such use.

        Promptly upon receipt by a party indemnified under this Section 9(e) of
notice of the commencement of any action against such indemnified party in
respect of which indemnity or reimbursement may be sought against any
indemnifying party under this Section 9(e), such



<PAGE>   17

indemnified party shall notify the indemnifying party in writing of the
commencement of such action, but the failure so to notify the indemnifying party
shall not relieve it of any liability which it may otherwise have to any
indemnified party under this Section 9(e). In case notice of commencement of any
such action shall be given to the indemnifying party as above provided, the
indemnifying party shall be entitled to participate in and, to the extent it may
wish, jointly with any other indemnifying party similarly notified, to assume
the defense of such action at its own expense, with counsel chosen by it and
satisfactory to such indemnified party. The indemnified party shall have the
right to employ separate counsel in any such action and participate in the
defense thereof, but the fees and expenses of such counsel (other than
reasonable costs of investigation) shall be paid by the indemnified party unless
(i) the indemnifying party either agrees to pay the same, (ii) the indemnifying
party fails to assume the defense of such action with counsel reasonably
satisfactory to the indemnified party, or (iii) the indemnified party has been
advised by counsel that one or more legal defenses may be available to the
indemnified party that may be contrary to the interest of the indemnifying
party. No indemnifying party shall be liable for any settlement entered into
without its consent, which consent may not be unreasonably withheld.

        If the indemnification provided for in this Section 9(e) is unavailable
to a party otherwise entitled to be indemnified in respect of any expenses,
losses, claims, damages or liabilities referred to herein, then the indemnifying
party, in lieu of indemnifying such party otherwise entitled to be indemnified,
shall contribute to the amount paid or payable by such party to be indemnified
as a result of such expenses, losses, claims, damages or liabilities in such
proportion as is appropriate to reflect the relative benefits received by
Issuer, the Selling Shareholders and the underwriters from the offering of the
securities and also the relative fault of Issuer, the Selling Shareholders and
the underwriters in connection with the statements or omissions which resulted
in such expenses, losses, claims, damages or liabilities, as well as any other
relevant equitable considerations. The amount paid or payable by a party as a
result of the expenses, losses, claims, damages and liabilities referred to
above shall be deemed to include any legal or other fees or expenses reasonably
incurred by such party in connection with investigating or defending any action
or claim, provided, however, that in no case shall any Selling Shareholder be
responsible, in the aggregate, for any amount in excess of the net offering
proceeds attributable to its Option Shares included in the offering. No person
guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of
the Securities Act) shall be entitled to contribution from any person who was
not guilty of such fraudulent misrepresentation. Any obligation by any holder to
indemnify shall be several and not joint with other holders.

        In connection with any registration pursuant to Section 9(a) or 9(b)
above, Issuer and each Selling Shareholder (other than Grantee) shall enter into
an agreement containing the indemnification provisions of this Section 9(e).

                             (f) Miscellaneous Reporting. Issuer shall comply
               with all reporting requirements and will do all such other things
               as may be necessary to permit the expeditious sale at any time of
               any Option Shares by the Selling Shareholders thereof in
               accordance with and to the extent permitted by any rule or
               regulation promulgated by the SEC from time to time. Issuer shall
               at its expense provide the Selling Shareholders with any
               information necessary in connection with the completion and
               filing of any reports or forms required to be filed by them




<PAGE>   18

               under the Securities Act or the Exchange Act, or required
               pursuant to any state securities laws or the rules of any stock
               exchange.

           10. Listing. If Issuer Common Stock or any other securities to be
acquired upon exercise of the Option are not then authorized for quotation on
the Nasdaq National Market or any securities exchange, Issuer, upon the request
of Holder, will promptly file an application to authorize for quotation the
shares of Issuer Common Stock or other securities to be acquired upon exercise
of the Option on the Nasdaq National Market and will use its best efforts to
obtain approval of such listing as soon as practicable.

           11. Division of Option. This Agreement (and the Option granted
hereby) are exchangeable, without expense, at the option of Holder, upon
presentation and surrender of this Agreement at the principal office of Issuer
for other agreements providing for other options of different denominations
entitling the holder thereof to purchase in the aggregate the same number of
shares of Issuer Common Stock purchasable hereunder. The terms "other
agreements" and "other options" as used in the preceding sentence mean any other
agreements and related options for which this Agreement (and the Option granted
hereby) may be exchanged. Upon receipt by Issuer of evidence reasonably
satisfactory to it of the loss, theft, destruction or mutilation of this
Agreement, and (in the case of loss, theft or destruction) of reasonably
satisfactory indemnification, and upon surrender and cancellation of this
Agreement, if mutilated, Issuer will execute and deliver a new Agreement of like
tenor and date. Any such new Agreement executed and delivered shall constitute
an additional contractual obligation on the part of Issuer, whether or not the
Agreement so lost, stolen, destroyed or mutilated shall at any time be
enforceable by anyone.

           12. Limitation on Total Profit and Notional Total Profit.

                             (a) Notwithstanding anything to the contrary
               contained herein, in no event shall Grantee's Total Profit (as
               defined below in Section 12(c) hereof) exceed $3.2 million and,
               if it otherwise would exceed such amount, Grantee, at its sole
               election, shall either (i) reduce the number of shares of Issuer
               common stock subject to the Option, (ii) pay cash to Issuer, or
               (iii) any combination thereof, so that Grantee's actually
               realized Total Profit shall not exceed $3.2 million after taking
               into account the foregoing actions.

                             (b) Notwithstanding anything to the contrary
               contained herein, the Option may not be exercised for a number of
               shares as would, as of the date of exercise, result in a Notional
               Total Profit (as defined below in Section 12(d) hereof) of more
               than $3.2 million; provided, that nothing in this sentence shall
               restrict any exercise of the Option permitted hereby on any
               subsequent date on which the Notional Total Profit would be less
               than $3.2 million..

                             (c) As used herein, the term "Total Profit" shall
               mean the aggregate amount (before taxes) of the following: (i)
               the amount received by Grantee pursuant to Issuer's repurchase of
               the Option (or any portion thereof) pursuant to Section 8 hereof,
               (ii) (x) the amount received by Grantee or any affiliate of
               Grantee pursuant to Issuer's repurchase of Option Shares pursuant
               to



<PAGE>   19

               Section 8 hereof, less (y) Grantee's or any affiliate of
               Grantee's purchase price for such Option Shares, (iii) (x) the
               net cash amounts received by Grantee or any affiliate of Grantee
               pursuant to the sale of Option Shares (or any other securities
               into which such Option Shares shall be converted or exchanged) to
               any unaffiliated party, less (y) Grantee's or any affiliate of
               Grantee's purchase price of such Option Shares, and (iv) any
               equivalent amounts with respect to the Substitute Option.

                             (d) As used herein, the term "Notional Total
               Profit" with respect to any number of shares as to which Grantee
               or any affiliate of Grantee may propose to exercise the Option
               shall be the Total Profit determined as of the date of such
               proposed exercise assuming that the Option were exercised on such
               date for such number of shares and assuming that such shares,
               together with all other Option Shares held by Grantee or any
               affiliate of Grantee as of such date, were sold for cash at the
               closing market price for the Issuer Common Stock as of the close
               of business on the preceding trading day (less customary
               brokerage commissions).

                             (e) Grantee agrees, promptly following any exercise
               of all or any portion of the Option, and subject to its rights
               under Section 8 hereof, to use and cause any wholly owned
               Subsidiary of Grantee to use commercially reasonable efforts
               promptly to maximize the value of Option Shares purchased taking
               into account market conditions, the number of Option Shares, the
               potential negative impact of substantial sales on the market
               price for Issuer Common stock, and the availability of an
               effective registration statement to permit public sale of Option
               Shares.

           13. Miscellaneous.

                             (a) Expenses. Except as otherwise provided in
               Section 9, each of the parties hereto and any Holder shall bear
               and pay all costs and expenses incurred by it or on its behalf in
               connection with the transactions contemplated hereunder,
               including, without limitation, fees and expenses of its own
               financial consultants, investment bankers, accountants and
               counsel.

                             (b) Waiver and Amendment. 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.

                             (c) Entire Agreement; No Third-Party Beneficiary.
               This Agreement, together with the Reorganization Agreement and
               the other documents and instruments referred to herein and
               therein (i) constitutes the entire agreement and supersedes all
               prior agreements and understandings, both written and oral,
               between the parties with respect to the subject matter hereof and
               (ii) is not intended to confer upon any person other than the
               parties hereto, and their




<PAGE>   20

               respective successors and assigns, any rights or remedies
               hereunder, except as expressly provided in this Agreement.

                             (d) Severability. If any term, provision, covenant
               or restriction of this Agreement is held by a court or a federal
               or state regulatory authority of competent jurisdiction to be
               invalid, void or unenforceable, such invalid, void or
               unenforceable term, provision, covenant or restriction shall, if
               it is so susceptible, be deemed modified to the minimum extent
               necessary to render the same valid and enforceable and, in all
               events, the remainder of the terms, provisions, covenants and
               restrictions of this Agreement shall remain in full force and
               effect and shall in no way be affected, impaired or invalidated.
               Without limiting the foregoing, if for any reason such court or
               regulatory authority determines that Holder may not legally
               acquire, or Issuer may not legally repurchase, the full number of
               shares of Issuer Common Stock as provided in Sections 3 and 8 (as
               adjusted pursuant to Section 7), it is the express intention of
               Issuer to allow Holder to acquire or to require Issuer to
               repurchase the maximum number of shares as may be legally
               permissible without any amendment or modification hereof.

                             (e) Governing Law. This Agreement shall be governed
               and construed in accordance with the laws of the State of
               California without regard to any applicable conflicts of law
               rules.

                             (f) Descriptive Headings. The descriptive headings
               contained herein are for convenience of reference only and shall
               not affect in any way the meaning or interpretation of this
               Agreement.

                             (g) Notices. All notices, requests, claims, demands
               and other communications under this Agreement shall be in writing
               and shall be given (and shall be deemed to have been duly
               received if so given) by personal delivery, by telecopy (provided
               that copy is concurrently sent by first class U.S. mail, postage
               prepaid), or by mail (registered or certified mail, postage
               prepaid, return receipt requested) to the parties as follows:

               If to Issuer:        Orange National Bancorp
                                    1201 E. Katella Avenue
                                    Orange, California 92867
                                    Attn:  Kenneth Cosgrove, President
                                    Fax No.: (714) 289-2310

               With a copy to:      Brobeck, Phleger & Harrison, LLP
                                    One Market Plaza
                                    San Francisco, California 94105
                                    Attn: J. Michael Shepherd
                                    Fax No.: (415) 442-1010




<PAGE>   21

               If to Grantee:       CVB Financial Corp.
                                    701 N. Haven Avenue
                                    Ontario, California 91423
                                    Attn:  D. Linn Wiley, President
                                    Fax No.: (909) 481-2130

               With a copy to:      Manatt, Phelps & Phillips
                                    11355 West Olympic Boulevard
                                    Los Angeles, California 90064
                                    Attn:  William T. Quicksilver
                                    Fax No.: (310) 312-4224

or to such other address as a party may have furnished to the others in writing
in accordance with this paragraph, except that notices of change of address
shall only be effective upon receipt. Any notice, demand or other communication
given pursuant to the provisions of this Section 11(g) shall be deemed to have
been given on the date actually delivered or on the third day following the date
mailed, whichever first occurs.

                             (h) Counterparts. This Agreement and any amendments
               hereto may be executed in two counterparts, each of which shall
               be considered one and the same agreement and shall become
               effective when both counterparts have been signed, it being
               understood that both parties need not sign the same counterpart.

                             (i) Assignment. Neither this Agreement nor any of
               the rights, interests or obligations hereunder or under the
               Option shall be assigned by any of the parties hereto without the
               prior written consent of the other party, except that Grantee may
               assign this Agreement to a wholly-owned subsidiary of Grantee and
               at any time after a Purchase Event occurs, Holder may assign or
               transfer its rights and obligations hereunder, in whole or in
               part, to any Person or Persons, subject to compliance with
               applicable laws. In order to effectuate the foregoing, Grantee
               shall be entitled to surrender this Agreement to Issuer in
               exchange for two or more Agreements entitling the holders thereof
               to purchase in the aggregate the same number of shares of Common
               Stock as may be purchasable hereunder. Subject to the preceding
               sentence, this Agreement shall be binding upon, inure to the
               benefit of, and be enforceable by the parties and their
               respective successors and permitted assigns.

                             (j) Further Assurances. In the event of any
               exercise of the Option by Holder, Issuer and Holder 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.

                             (k) Specific Performance. The parties hereto agree
               that this Agreement may be enforced by either party through
               specific performance, injunctive relief and other equitable
               relief. Both parties further agree to waive any requirement for
               the securing or posting of any bond in connection with the
               obtaining of any such equitable relief and that this provision is
               without prejudice



<PAGE>   22

               to any other rights that the parties hereto may have for any
               failure to perform this Agreement.

               IN WITNESS WHEREOF, Issuer and Grantee have caused this Stock
Option Agreement to be signed by their respective officers thereunto duly
authorized, all as of the day and year first written above.



CVB FINANCIAL CORP.                          ORANGE NATIONAL BANCORP



By  /s/ D. Linn Wiley                        By  /s/ Kenneth Cosgrove
   ------------------------------               ------------------------------
    D. Linn Wiley                                Kenneth Cosgrove
    President                                    President






<PAGE>   1














                                  EXHIBIT 99.1

                                  PRESS RELEASE




<PAGE>   2


PRESS RELEASE    

                 CONTACT:   D. LINN WILEY               KENNETH J. COSGROVE
                            PRESIDENT AND               PRESIDENT AND
                            CHIEF EXECUTIVE OFFICER     CHIEF EXECUTIVE OFFICER
                            (909) 980-4030              (714) 771-4000



FOR IMMEDIATE RELEASE


    CVB FINANCIAL CORP. AND ORANGE NATIONAL BANCORP JOINTLY ANNOUNCE MERGER.
           CVB FINANCIAL CORP. TO TERMINATE ITS STOCK REPURCHASE PLAN.

ONTARIO, CALIFORNIA, May 18, 1999 - D. Linn Wiley, President and Chief Executive
Officer of CVB Financial Corp. and its principal subsidiary, Citizens Business
Bank, and Kenneth J. Cosgrove, President and Chief Executive Officer of Orange
National Bancorp and its principal subsidiary, Orange National Bank, jointly
announced today that the two financial institutions have executed a definitive
agreement and plan for reorganization. This agreement provides for Orange
National Bancorp to merge with and into CVB Financial Corp., and for Orange
National Bank to merge with and into Citizens Business Bank. CVB Financial and
Citizens Business Bank will represent the continuing operation.

The definitive agreement provides that the shareholders of Orange National
Bancorp will receive one and one-half shares of CVB Financial Corp. stock for
each share of Orange National Bancorp stock. The merger will be accounted for as
a pooling of interest for accounting purposes. Orange National Bancorp has
granted CVB Financial Corp. an option to purchase up to 19.9% of the outstanding
shares of Orange National Bancorp which is exercisable upon the occurrence of
certain events including the acquisition of Orange National by a party other
than CVB Financial Corp. The transaction is subject to shareholder and
regulatory approval. The transaction is expected to be completed in the third
quarter or early in the fourth quarter of 1999.

Wiley stated, "We are delighted to have this opportunity to associate with an
outstanding banking organization, and to increase our presence in Orange County.
Orange National Bank is an excellent complement to our existing franchise and
our business and professional banking strategy."

Orange National Bank has six offices located in Orange, Laguna Hills and Laguna
Beach. The Bank had total assets of $279 million, total deposits of $252
million, total loans of $146 million and stockholders' equity of $24.1 million
as of March 31, 1999.

Citizens Business Bank has 24 offices located throughout the Inland Empire, San
Gabriel Valley and North Orange County. CVB Financial Corp. had total assets of
$1.53 billion, total deposits



<PAGE>   3

of $1.17 billion, total loans of $698.8 million and stockholders' equity of
$117.5 million as of March 31, 1999.

Cosgrove said that, "Our Board of Directors is pleased to join with Citizens
Business Bank. They are a premier performing bank with an outstanding record for
serving their customers. Citizens Business Bank will be an outstanding addition
to the Orange County business community."

The Board of Directors of CVB Financial Corp. also voted to discontinue the
program to repurchase its shares of common stock. This rescinds the earlier
decision to repurchase up to 500,000 shares or $9.0 million in the Company stock
announced August 21, 1998. CVB had repurchased 234,473 shares between August 21,
1998 and the date of this release.

Citizens Business Bank is the largest bank with headquarters in the Inland
Empire region of California. CVB Financial is traded on the American Stock
Exchange under the ticker symbol CVB. Orange National Bancorp is traded on the
Nasdaq National Market System under the symbol OGNB.

This press release contains statements which constitute forward looking
statements (within the meaning of the Private Securities Litigation Reform Act
of 1995) that involve risks and uncertainties. Actual results may differ
materially from the results discussed in these forward looking statements.
Factors that might cause such a difference include, but are not limited to,
expected cost savings from the merger not being fully realized, revenues
following the merger being lower than expected and costs or difficulties related
to the integration of CVB Financial Corp. and Orange National Bancorp being
greater than expected.








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