AGREEMENT AND PLAN OF MERGER

Exhibit 2.1

AGREEMENT AND PLAN OF MERGER

among

COMMERCE BANCSHARES, INC.,

SOUTH TULSA FINANCIAL CORPORATION

and

CBI-KANSAS, INC.

Dated December 4, 2006

TABLE OF CONTENTS

INDEX OF DEFINED TERMS

      THIS AGREEMENT AND PLAN OF MERGER (this “Agreement”) is made and entered into as of December 4, 2006 among COMMERCE BANCSHARES, INC. , a Missouri corporation (“Commerce”), CBI-KANSAS, INC. , a Kansas corporation (“Sub”) and SOUTH TULSA FINANCIAL CORPORATION , an Oklahoma corporation (“Company”).

     WHEREAS, the Executive Committee of the Board of Directors of Commerce and the Board of Directors of Sub have approved this Agreement, declared it advisable and deem it advisable and in the best interests of their respective shareholders to consummate the transactions provided for herein in which, inter alia, Commerce and Company become affiliated through the merger of Company with and into Sub (the “Merger”);

     WHEREAS, the Board of Directors of Company has approved this Agreement and declared it advisable and deems it advisable and in the best interests of the shareholders of Company to consummate the Merger;

     WHEREAS, the Boards of Directors of Commerce, Sub and Company have each determined that the Merger and the other transactions contemplated by this Agreement are consistent with, and will contribute to the furtherance of, their respective business strategies and goals.

     NOW, THEREFORE, in consideration of the foregoing and the respective representations, warranties, covenants and agreements set forth herein, the parties hereto agree as follows:

ARTICLE I
THE MERGER

      1.1 Effective Time of the Merger . Subject to the terms and conditions of this Agreement, on the Closing Date (as hereinafter defined), the proper officers of Company and Sub shall execute and acknowledge the appropriate certificates of merger that shall be filed with the Kansas Secretary of State and the Oklahoma Secretary of State on the first Business Day following the Closing Date, all in accordance with the Kansas General Corporation Code (“KGCC”) and the Oklahoma General Corporation Act (“OGCA”), respectively. The Merger shall become effective on the first day of the first calendar month following the Closing Date (the “Effective Time”).

      1.2 Closing . The closing of the Merger (the “Closing”) will take place at 10 a.m., Kansas City time, on a day occurring not less than two (2) and not more than four (4) Business Days before the Effective Time and not later than thirty (30) days after the date on which the last of any condition precedent contained herein is waived or fulfilled, as specified in a notice delivered by Commerce to Company not less than three (3) Business Days prior to such Closing Date or on such other date as Company, Commerce and Sub shall mutually agree (the “Closing Date”). The Closing shall be held at the offices of Commerce Bank, N.A., 1000 Walnut, Kansas City, Missouri or at such other location as is agreed to in writing by the parties hereto. As used in this Agreement, “Business Day” shall mean any day that is not a Saturday, Sunday or other day on which banks are required or authorized by law to be closed in Missouri.

      1.3 Effects of the Merger .

          (a) At the Effective Time (i) Company shall be merged with and into Sub and the separate corporate existence of Company shall cease, (ii) the Articles of Incorporation of Sub as in effect immediately prior to the Effective Time shall be the Articles of Incorporation of the Surviving Corporation, (iii) the By-laws of Sub as in effect immediately prior to the Effective Time shall be the By-laws of the Surviving Corporation, (iv) the directors of Sub at the Effective Time shall be the directors of the Surviving Corporation and (v) the officers of Sub immediately prior to the Effective Time shall be the officers of the Surviving Corporation, until the earlier of their resignation or removal or until their respective successors are duly elected and qualified, as the case may be.

          (b) Subject to Oklahoma law, at the Effective Time, (i) Sub shall possess all assets and property of every description, and every interest therein, wherever located, and the rights, privileges, immunities, powers, franchises, and authority, of a public as well as of a private nature, of Company and all obligations belonging to or due each of Company and Sub shall be vested in Sub without further act or deed; (ii) title to any real estate or any interest therein vested in Company shall not revert or in any way be impaired by reason of the Merger; (iii) all rights of creditors and all liens on any property of Company shall be preserved unimpaired; (iv) Sub shall be liable for all the obligations of Company, and any claim existing, or action or proceeding pending, by or against either of Company or Sub, may be prosecuted to judgment with the right of appeal, as if the Merger had not taken place.

          (c) As used in this Agreement, “Surviving Corporation” shall mean Sub, at and after the Effective Time, as the surviving corporation in the Merger.

          (d) At and after the Effective Time, the Merger will have the effects set forth in the OGCA and the KGCC.

      1.4 Absence of Control . Subject to any specific provisions of this Agreement, it is the intent of the parties hereto that neither Sub nor Company by reason of this Agreement shall be deemed (until consummation of the transactions contemplated hereby) to control, directly or indirectly, the other party and shall not exercise, or be deemed to exercise, directly or indirectly, a controlling influence over the management or policies of such other party.

      1.5 Further Assurances . If at any time after the Effective Time, Sub shall consider it advisable that any further conveyances, agreements, documents, instruments or assurances of law or any other actions or things are necessary or desirable to vest, perfect, confirm, or record in Sub the title to any property, rights, privileges, powers, or franchises of Company, the Board of Directors and officers of Sub shall, and will be authorized to, execute and deliver in the name and on behalf of Company or otherwise, any and all proper conveyances, agreements, documents, instruments, and assurances of law and do all things necessary or proper to vest, perfect, or confirm title to such property, rights, privileges, powers and franchises in Sub, and otherwise to carry out the provisions of this Agreement.

      1.6 The Bank Merger . The parties understand and agree that it is the intention of Commerce and Sub, simultaneously with the Merger, to merge Company’s Subsidiary, Bank

South (“Bank”) with Commerce Bank, N.A., a wholly owned subsidiary of Sub (the “Bank Merger”). Company agrees to cooperate with Commerce and Sub and take all reasonable steps in order to effectuate the Bank Merger. All out of pocket expenses incurred by Company and Bank in consummating the Bank Merger, shall be paid by Sub.

      1.7 Tax Consequences . It is intended that the Merger shall constitute a reorganization within the meaning of Section 368(a) of the Internal Revenue Code of 1986 (the “Code”) and that this Agreement shall constitute a “plan of reorganization” for the purposes of Section 368(a) of the Code.

ARTICLE II
EFFECT OF THE MERGER ON THE CAPITAL STOCK OF COMPANY AND SUB; EXCHANGE OF CERTIFICATES

      2.1 Effect of Merger on Sub Stock . At the Effective Time of the Merger, each share of common stock, $1.00 par value per share, of Sub issued and outstanding immediately prior to the Effective Time shall remain issued and outstanding at the Effective Time and shall be unaffected by the Merger.

      2.2 Conversion of Company Shares in the Merger . At the Effective Time, by virtue of the Merger and without any action on the part of any holder thereof each outstanding share of common stock, $1.00 par value per share, of the Company (“Company Common Stock”) (but excepting Company Dissenting Shares) shall be converted as follows: each such share of Company Common Stock held by each shareholder of Company at the Effective Time shall be converted into such number of shares of common stock, $5.00 par value per share, of Commerce (“Commerce Common Stock”) as shall be equal to the quotient of $340.54 (the “Company Per Share Value”) divided by the Commerce Stock Price (as defined below and rounded to four decimal places) if the Commerce Stock Price is greater than or equal to $45.30 and less than or equal to $50.06; that number of shares of Commerce Common Stock equal to the Company Per Share Value divided by $45.30 if the Commerce Stock Price is less than $45.30; and that number of shares of Commerce Common Stock equal to the Company Per Share Value divided by $50.06 if the Commerce Stock Price is greater than $50.06 (such amount of stock as so determined being herein referred to as the “Stock Per Share Amount”). The figures of $45.30 and $50.06 referred to above are the “Collars.”

     “Commerce Stock Price” of Commerce Common Stock shall be the average of the daily closing price per share of Commerce Common Stock on The Nasdaq Stock Market, Inc. National Market System (as reported in The Wall Street Journal or, if not reported thereby, another alternative source as chosen by Commerce) for the ten (10) consecutive trading days ending on and including the fifth trading day prior to the Closing Date. The Collars shall be equitably adjusted to account for any intervening stock splits, stock dividends, combinations or exchanges pertaining to or affecting the Commerce Stock occurring after the date hereof, which stock split, stock dividend, combination or exchange has a record date (or, if no record date has been established, is effective) prior to the Effective Time.

      2.3 No Further Ownership Rights in Company Common Stock . All shares of Commerce Common Stock issued upon conversion of shares of Company Common Stock in

accordance with the terms hereof shall be deemed to represent all rights pertaining to such shares of Company Common Stock, and, after the Effective Time, there shall be no further registration of transfers on the stock transfer books of Company of the shares of Company Common Stock which were outstanding immediately prior to the Effective Time. If, after the Effective Time, certificates formerly representing shares of Company Common Stock are presented to Commerce for any reason, they shall be canceled and, if applicable, exchanged as provided in this ARTICLE II.

      2.4 Fractional Shares . Notwithstanding any other provision hereof, no fractional shares of Commerce Common Stock and no certificates or script therefor or other evidence of ownership thereof shall be issued to holders of shares of Company Common Stock. In lieu thereof, each such holder entitled to a fraction of a share of Commerce Common Stock (after taking into account all shares of Company Common Stock held at the Effective Time by such holder) shall receive from the Exchange Agent (as defined below), at the time of surrender of the certificates representing such holder’s Company Common Stock, an amount in cash equal to the product of such fraction and the Commerce Stock Price. No such holder shall be entitled to dividends, voting rights, interest on the value of, or any other rights in respect of a fractional share. Commerce, on behalf of Sub, shall make available to the Exchange Agent, as required from time to time, any cash necessary for this purpose.

      2.5 Surrender of Shares of Company Common Stock . Prior to the Effective Time, Commerce and Sub shall appoint Commerce Bank, N.A. or its successor, as exchange agent (the “Exchange Agent”) for the purpose of exchanging certificates representing Commerce Common Stock which are to be issued pursuant to Section 2.2. Commerce, on behalf of Sub, shall make available to Exchange Agent, at and after the Effective Time such number of shares of Commerce Common Stock as shall be issuable to the holders of Company Common Stock in accordance with Section 2.2 hereof. As soon as practicable after the Closing Date, Commerce on behalf of Exchange Agent shall mail to each holder of record of a certificate that immediately prior to the Closing Date represented outstanding shares of Company Common Stock (i) a form letter of transmittal and (ii) instructions for effecting the surrender of certificates of Company Common Stock for exchange into certificates of Commerce Common Stock.

      2.6 Appraisal Rights . Notwithstanding anything in this Agreement to the contrary, shares of Company Common Stock which are issued and outstanding immediately prior to the Effective Time and which are held by shareholders that have not voted such shares in favor of the Merger and have delivered a written demand for the payment of such shares in the manner provided in the laws of the State of Oklahoma (such shares, the “Company Dissenting Shares”) shall not be converted into or represent the right to receive Commerce Common Stock as provided in Section 2.2 and the holders thereof shall only be entitled to such rights as are granted by Section 1091 of the OGCA. Each holder of Company Dissenting Shares that becomes entitled to payment for such shares pursuant to Section 1091 of the OGCA shall receive payment therefor from the Surviving Corporation in accordance with the OGCA; provided, however, that if any such holder of Company Dissenting Shares shall fail to perfect or shall have effectively withdrawn or lost the right to dissent, such holder’s or holders’ (as the case may be) shares of Company Common Stock shall thereupon be deemed to have been converted, as of the Effective Time, into and represent the right to receive from the Surviving Corporation the shares of Commerce Common Stock and cash as provided in Sections 2.2 and 2.4 hereof. The Company

shall give Commerce prompt written notice of any demands received by the Company for appraisal of shares of Company Common Stock, and Commerce shall have the right to participate in all negotiations and proceedings with respect to such demands. The Company shall not, except with the prior written consent of Commerce, make any payment with respect to, or settle or offer to settle, any such demands.

      2.7 Shareholder Approval . Company agrees to submit this Agreement and the transactions contemplated hereby to its shareholders for approval to the extent required and as provided by law and the Certificate of Incorporation and By-laws of Company and in accordance with Section 5.2 hereof. A shareholders’ meeting of the Company shall be held and Company shall use its reasonable best efforts to take all steps as shall be required for said meeting to be held as soon as reasonably practicable after the effective date of the Registration Statement (as defined in Section 5.1(a) hereof). Company and its Board of Directors shall recommend, subject to the exercise of their fiduciary responsibilities, that the shareholders of the Company approve this Agreement and the transactions contemplated hereby and shall use their reasonable best efforts to secure such approval.

ARTICLE III
REPRESENTATIONS AND WARRANTIES

      3.1 Representations and Warranties of Company . Company hereby represents and warrants to Commerce and Sub as follows:

          (a) Organization, Standing and Power . Company is a bank holding company registered under the Bank Holding Company Act of 1956, as amended (the “BHC Act”). Company has one bank subsidiary, Bank South (“Bank”); Bank is a wholly owned Subsidiary of Company and is a bank organized under the laws of the State of Oklahoma. The deposit accounts of Bank are insured by the Deposit Insurance Fund of the Federal Deposit Insurance Corporation (“FDIC”) to the fullest extent permitted by law, and all premiums and assessments required in connection therewith have been paid when due. Company and each Subsidiary, as defined below, is a bank or corporation duly organized, validly existing and in good standing under the laws of its jurisdiction of incorporation or organization, has all requisite power and authority to own, lease and operate its properties and to carry on its business as now being conducted and is duly qualified and in good standing to do business in each jurisdiction in which the nature of its business or the ownership or leasing of its properties makes such qualification necessary, other than in such jurisdictions where the failure so to qualify would not, either individually or in the aggregate, have a Material Adverse Effect on Company. The Certificate of Incorporation and By-laws of each of Company, and each Subsidiary of Company, copies of which are attached to Schedule 3.1(a), are true, complete and correct. The minute books of Company and its Subsidiaries which have been made available to Commerce contain, in all material respects, a complete (except for certain portions thereof relating to the Merger and the transactions contemplated hereby) and accurate record of all meetings of the respective Boards of Directors (and committees thereof) and shareholders.

     As used in this Agreement,

               (i) the term “Subsidiary” when used with respect to any party means any corporation or other organization, whether incorporated or unincorporated, (x) of which such party or any other Subsidiary of such party is a general partner (excluding partnerships, the general partnership interests of which held by such party or any Subsidiary of such party do not have a majority of the voting interests in such partnership), or (y) at least a majority of the securities or other interests of which having by their terms ordinary voting power to elect a majority of the board of directors or others performing similar functions with respect to such corporation or other organization is directly or indirectly owned or controlled by such party or by any one or more of its Subsidiaries, or by such party and one or more of its Subsidiaries,

               (ii) any reference to any event, change or effect being “material” with respect to any entity means an event, change or effect which is material in relation to the condition (financial or otherwise), properties, assets, liabilities, businesses, results of operations or prospects of such entity and its Subsidiaries taken as a whole,

               (iii) the term “Material Adverse Effect” means, with respect to any entity, a material adverse effect (whether or not required to be accrued or disclosed under Statement of Financial Accounting Standards No. 5) (A) on the condition (financial or otherwise), properties, assets, liabilities, businesses or results of operations of such entity and its Subsidiaries taken as a whole (but does not include any such effect resulting from or attributable to any action or omission by Company, Commerce, Sub or any Subsidiary of any of them required to be taken under this Agreement or taken with the prior written consent of the other parties hereto, in contemplation of the transactions contemplated hereby), or (B) on the ability of such entity to perform its obligations under the Transaction Agreements (as defined below) on a timely basis; provided, that in determining whether a Material Adverse Effect has occurred, there shall be excluded the effect of: (i) general economic, regulatory or political conditions (including the outbreak or continuation of war, armed conflict or other hostilities), (ii) changes in interest rates and foreign currency exchange rates, (iii) circumstances that affect the industries in which the Company operates generally, (iv) changes in law, in GAAP or in any interpretation thereof, (v) the announcement or pendency of the transactions provided for in this Agreement, (vi) the disclosure of the fact that Commerce or Sub is the prospective acquirer of Company or (vii) any expenses incurred in connection with this Agreement or the transactions contemplated hereby.

               (iv) the term “Transaction Agreements” shall mean this Agreement and the Certificate of Merger to be filed pursuant to the KGCC and the OGCA,

               (v) the term “knowledge” or “to the best knowledge of” a party hereto means the actual knowledge of a director or executive officer or senior management of a party after reasonable inquiry under all the circumstances,

               (vi) the term “Affiliate” means, as to any person, a person which controls, is controlled by or is under common control with such person, and

               (vii) the term “person” shall mean an individual, corporation, partnership, limited liability company, joint venture, association, trust, unincorporated organization or other entity.

          (b) Capital Structure; Ownership of Company Common Stock .

               (i) The authorized capital stock of Company consists of 100,000 shares of Company Common Stock, par value $1.00 per share, of which as of the date hereof, 72,189 shares of Company Common Stock were outstanding. All outstanding shares of Company Common Stock have been duly authorized and validly issued and are fully paid and non-assessable and not subject to preemptive rights. As of the Closing Date, all outstanding shares of Company Common Stock will be duly authorized and validly issued and will be fully paid and non-assessable and not subject to preemptive rights. In addition to those shares of Company Common Stock currently outstanding, the Company has issued (i) options to purchase 4,000 shares of Company Common Stock having an exercise price of $108.00 per share and (ii) options to purchase 3,970 shares of Company Common Stock having an exercise price of $155.00 per share (collectively, the “Company Options” ) pursuant to that certain South Tulsa Financial Corporation Stock Option Plan (the “Company Stock Option Plan”) . All shares of the Company Common Stock subject to the Company Options shall, upon their issuance on the terms and conditions specified in the instruments pursuant to which they are issuable, will be duly authorized and validly issued and will be fully paid, non-assessable and not subject to preemptive rights, and will not be issued in violation of any preemptive rights.

               (ii) The authorized capital stock of Bank consists of 50,000 shares of common stock, $25.00 par value per share, of which 40,000 shares are outstanding (the “Bank Common Stock”). All outstanding shares of Bank Common Stock have been duly authorized and validly issued and are fully paid and, except as provided by Section 220 of the Oklahoma Banking Code, non-assessable and not subject to preemptive rights. The Company owns all of the issued and outstanding shares of its Subsidiaries free and clear of all liens, encumbrances, equities or claims.

               (iii) Except for this Agreement, the Company Options and any arrangements or agreements described in Section 3.1(b)(iii) of the disclosure schedule of Company delivered to Commerce and Sub on the date hereof (the “Company Disclosure Schedule”), (A) there are no outstanding options, warrants, calls, rights, commitments or agreements of any character to which Company or any of its Subsidiaries or Affiliates (as defined herein) is a party or by which any of the foregoing are bound obligating Company or any of its Subsidiaries, including Bank, or Affiliates to issue, deliver or sell, or cause to be issued, delivered or sold, additional shares of capital stock of Company or any of its Subsidiaries or obligating Company or any of its Subsidiaries or Affiliates to grant, extend or enter into any such option, warrant, call, right, commitment or agreement, (B) there are no outstanding contractual obligations of Company or any of its Subsidiaries or Affiliates to repurchase, redeem or otherwise acquire any shares of capital stock of Company or any of its Subsidiaries and (C) there are no outstanding securities of any kind convertible into or exchangeable for the capital stock of Company or any of its Subsidiaries (or any interest therein). Except for voting agreements entered into by certain stockholders of the Company (the “Voting Agreements”) in conjunction with the parties entering into this Agreement and as set forth in Section 3.1(b)(iii) of the

Company Disclosure Schedule, there is no agreement of any kind to which Company or Bank is a party that gives any person any right to participate in the equity, value or income of, or to vote (x) in the election of directors or officers of, or (y) otherwise with respect to the affairs of, Company or any of its Subsidiaries.

               (iv) Neither Company nor any of its Subsidiaries beneficially owns, directly or indirectly, any shares of capital stock of Commerce or Sub, securities of Commerce or Sub convertible into, or exchangeable for, such shares, or options, warrants or other rights to acquire such shares (regardless of whether such securities, options, warrants or other rights are then exercisable or convertible), nor is Company or any of such Subsidiaries a party to any agreement, arrangement or understanding for the purpose of acquiring, holding, voting or disposing of shares of capital stock of Commerce or Sub or any such other securities, options, warrants or other rights.

               (v) No shares of Company Common Stock are held directly or indirectly by Company or its Subsidiaries in trust accounts, managed accounts and the like or otherwise held in a fiduciary or nominee and no shares of Company Common Stock are held by Company or its Subsidiaries in respect of a debt previously contracted.

          (c) Authority; No Violation . Company has all requisite corporate power and authority to enter into this Agreement and the other Transaction Agreements and to consummate the transactions contemplated hereby and thereby. The execution and delivery of this Agreement, and, to the extent execution by the Company is required, the other Transaction Agreements and the consummation of the transactions contemplated hereby and thereby have been duly authorized by all necessary corporate action on the part of Company, other than the approval of this Agreement and the Merger by the holders of a majority of the outstanding shares of Company Common Stock entitled to vote (the “Company Shareholder Approval”). This Agreement has been duly executed and delivered by Company, and (assuming due authorization, execution and delivery by Commerce and Sub) constitutes the valid and binding obligations of Company, enforceable against Company in accordance with its terms, subject, as to enforceability, to bankruptcy, insolvency and other laws of general applicability relating to or affecting creditors’ rights and to general equity principles.

               (i) The Company Shareholder Approval is the only vote of any class or series of Company capital stock necessary to approve this Agreement and the consummation of the transactions contemplated hereby. Subject to Section 5.2, the Board of Directors of Company will direct that this Agreement and the transactions contemplated hereby be submitted to Company’s shareholders for approval at a meeting of such shareholders. Subject to Section 5.2, the Board of Directors of Company will recommend that the Company’s shareholders approve this Agreement and the transactions contemplated hereby and, if and to the extent applicable, will exempt the transaction from any applicable state takeover statutes.

               (ii) Except as set forth in Section 3.1(c)(ii) of the Company Disclosure Schedule, subject to approval by the appropriate regulatory agencies, the execution, delivery and performance of this Agreement and the other Transaction Agreements by Company do not, and the consummation of the transactions contemplated hereby will not, constitute (x) a breach or violation of, or a default under, any law, rule or regulation or any judgment, decree, order,

governmental permit or license, or agreement, indenture or instrument of Company or any of its Subsidiaries or to which Company or any of its Subsidiaries (or any of their respective properties) is subject, except where any such breach, violation or default would not have a Material Adverse Effect (y) a breach or violation of, or a default under, the certificate of incorporation, charter or bylaws of Company or any Subsidiary of Company, or (z) a breach or violation of, or a default under (or an event which with due notice or lapse of time or both would constitute a default under), or result in the 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 Company under any of the terms, conditions or provisions of any note, bond, indenture, deed of trust, loan agreement or other agreement, instrument or obligation to which Company is a party, or to which any of its respective properties or assets may be bound or affected except where any such breach, violation or default would not have a Material Adverse Effect.

               (iii) No consent, approval, order or authorization of, or registration, declaration or filing with, any court, administrative agency or commission or other governmental authority or instrumentality, domestic or foreign (a “Governmental Entity”), is required by or with respect to Company or any of its Subsidiaries in connection with the execution and delivery of this Agreement or the other Transaction Agreements or the consummation by Company of the transactions contemplated hereby or thereby, which, if not made or obtained, would have a Material Adverse Effect on Company or on the ability of Company to perform its obligations hereunder or thereunder on a timely basis, or on Commerce’s or Sub’s ability to own, possess or exercise the rights of an owner with respect to the business and assets of Company and its Subsidiaries, except for (A) the filing of applications and notices with the Board of Governors of the Federal Reserve System (the “Federal Reserve”) under the BHC Act and approval of same, (B) the filing by Commerce with the Securities and Exchange Commission (the “SEC”) of a Registration Statement (as defined in Section 5.1(a) hereof)) to register the Commerce Common Stock to be issued, (C) such applications, filings, authorizations, orders and approvals as may be required by the FDIC, the Missouri Division of Finance and the Oklahoma State Banking Department, (D) the filing with the Secretary of State of Kansas of the Certificate of Merger and (E) the filing with the Secretary of State of Oklahoma of the Certificate of Merger.

          (d) Financial Statements . Company has previously delivered to Commerce and Sub copies of (a) the consolidated financial statements of Company and its Subsidiaries, as of December 31, 2005, consisting of consolidated balance sheets as of December 31, 2004 and 2005 and the related consolidated statements of income, stockholders’ equity and cash flows for the years ended December 31, 2004 and 2005, inclusive, in each case accompanied by the report of BKD, LLP independent auditors with respect to Company (the consolidated financial statements of Company and its Subsidiaries referred to in this clause being hereinafter sometimes referred to as the “Company Consolidated Financial Statements”) and (b) the unaudited consolidating financial statements of Company and its Subsidiaries as of September 30, 2006, consisting of an unaudited consolidating balance sheet dated September 30, 2006 and an unaudited consolidating statement of income for the nine-month period ended September 30, 2006 (the unaudited consolidating financial statements of Company and its Subsidiaries referred to in this clause being sometimes hereinafter referred to as the “Company Interim Financial Statements”). Each of the financial statements referred to in this Section 3.1(d) (including the related notes, where applicable) fairly present (subject, in the cases of the Company Interim

Financial Statements, to normal recurring and year-end audit adjustments, none of which are expected to be material in nature or amount and the fact that the Company Interim Financial Statements do not contain footnotes), the results of the consolidated operations and changes in shareholders’ equity and consolidated financial condition of Company and its Subsidiaries as of the dates and for the respective periods therein set forth. Each of such statements (including the related notes, where applicable) has been prepared, in accordance with United States generally accepted accounting principles (“GAAP”) consistently applied during the periods involved, except in each case as indicated in such statements (including the Independent Accountants’ Report in the case of the Company Consolidated Financial Statements) or in the notes thereto; provided, that the Company Interim Financial Statements omit all footnote disclosures required by GAAP. The books and records of Company and its Subsidiaries have been, and are being, maintained where required in material compliance with GAAP and any other applicable legal and accounting requirements and, where such books and records purport to reflect any transactions, the transactions so reflected are actual transactions. Company has no material liabilities or obligations of a type which would be included in a balance sheet prepared in accordance with GAAP whether related to tax or non-tax matters, accrued or contingent, due or not yet due, liquidated or unliquidated, or otherwise, except as and to the extent disclosed or reflected in the balance sheet of Company as of December 31, 2005, or incurred since December 31, 2005, in the ordinary course of business.

          (e) Company Information Supplied . None of the information supplied or to be supplied by Company for inclusion in the (i) Registration Statement will, at the time the Registration Statement is filed with the SEC and at the time it becomes effective under the Securities Act of 1933, as amended, or any successor federal statute and the rules and regulations promulgated thereunder (the “Securities Act”), 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 therein not misleading, and (ii) the Proxy Statement (as defined in Section 5.1(a)) relating to the meeting of the shareholders of Company (the “Company Shareholders’ Meeting”) at which the Company Shareholder Approval will be sought will not, at the date of mailing to shareholders of Company and at the time of the Company Shareholders’ Meeting, 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, other than information supplied by Commerce or Sub.

          (f) Compliance with Applicable Laws . Company and its Subsidiaries hold, and at all relevant times have held, all material permits, licenses, variances, exemptions, orders, approvals, franchises and rights of all Governmental Entities necessary for the lawful operation of the businesses of Company and its Subsidiaries (the “Company Permits”). Company and its Subsidiaries are in compliance and have complied with the terms of the Company Permits, except where the failure so to comply, individually or in the aggregate, would not have a Material Adverse Effect on Company. The businesses of Company and its Subsidiaries are not being conducted in violation of any law, ordinance or regulation of any Governmental Entity, except for possible violations which, individually or in the aggregate, do not, and, insofar as reasonably can be foreseen, in the future will not, have a Material Adverse Effect on Company. Except for routine examinations by Federal or state Governmental Entities charged with the supervision or regulation of banks or bank holding companies or engaged in the insurance of bank deposits (“Bank Regulators”), no investigation by any Governmental Entity with respect to

Company or any of its Subsidiaries is pending or, to the knowledge of Company, threatened, and no proceedings by any Bank Regulator are pending or, to the knowledge of Company, threatened which seek to revoke or materially limit any of the Company Permits. Company and its Subsidiaries do not offer or sell insurance and/or securities products, including but not limited to annuity products, for their own account or the account of others.

          (g) Litigation . Except as set forth in Section 3.1(g) of the Company Disclosure Schedule, there is no suit, action, proceeding, arbitration or investigation (“Litigation”) pending to which Company or any Subsidiary of Company is a party or by which any of such persons or their respective assets may be bound or, to the knowledge of Company, threatened against or affecting Company or any Subsidiary of Company, or challenging the validity or propriety of the transactions contemplated hereby which, if adversely determined, would, individually or in the aggregate, have or reasonably be expected to have a Material Adverse Effect on Company or on the ability of Company to perform its obligations under this Agreement in a timely manner, nor is there any judgment, decree, injunction, rule or order of any Governmental Entity or arbitrator outstanding against Company or any Subsidiary of Company.

          (h) Taxes . Except as set forth in Section 3.1(h) of the Company Disclosure Schedule, each of the Company and its Subsidiaries has timely filed all Tax Returns (as defined below) required to be filed by them, and the Company and each of its Subsidiaries has timely paid and discharged all Taxes (as defined below) due in connection with or with respect to the filing of such Tax Returns and have timely paid all other Taxes as are due, except such as are being contested in good faith by appropriate proceedings and with respect to which the Company is maintaining reserves adequate for their payment. The liability for Taxes set forth on each such Tax Return adequately reflects the Taxes required to be reflected on such Tax Return. For purposes of this Agreement, “Tax” or “Taxes” shall mean taxes, charges, fees, levies, and other governmental assessments and impositions of any kind, payable to any federal, state, local or foreign governmental entity or taxing authority or agency, including, without limitation, (a) income, franchise, profits, gross receipts, estimated, ad valorem, value added, sales, use, service, real or personal property, capital stock, license, payroll, withholding, disability, employment, social security, workers compensation, unemployment compensation, utility, severance, production, excise, stamp, occupation, premiums, windfall profits, transfer and gains taxes, (b) custom duties, imposts, charges, levies or other similar assessments of any kind, and (c) interest, penalties and additions to tax imposed with respect thereto, and “Tax Returns” shall mean returns, reports, and information statements with respect to Taxes required to be filed with the United States Internal Revenue Service or any other governmental entity or taxing authority or agency, domestic or foreign, including, without limitation, consolidated, combined and unitary tax returns. Except as set forth in Section 3.1(h) of the Company Disclosure Schedule, to the knowledge of the Company, but such knowledge qualification shall only apply to (i), (ii) and (iii), below: (i) there are no liens with respect to Taxes (other than current Taxes not yet due and payable) upon any of the assets or properties of Company and its Subsidiaries, (ii) no material issue relating to Taxes of Company and its Subsidiaries has been raised in writing by any taxing authority in any audit or examination which can result in a proposed adjustment or assessment by a governmental authority in a taxable period (or portion thereof) ending on or before the Closing Date, (iii) Company and its Subsidiaries have duly and timely withheld from all payments (including employee salaries, wages and other compensation paid to independent contractors, creditors, stockholders or other third parties) and paid over to the appropriate taxing authorities

all amounts required to be so withheld and paid over for all periods for which the statute of limitations has not expired under all applicable laws and regulations and have complied with the applicable information reporting requirements under Part III, Subchapter A of Chapter 61 of the Code and similar state and local information reporting requirements, (iv) as of the Closing Date, none of Company nor any of its Subsidiaries shall be a party to, be bound by or have any obligation under, any tax sharing agreement or similar contract or arrangement or any agreement that obligates any of them to make any payment computed by reference to the income taxes, taxable income or taxable losses of any other person, (v) there is no contract or agreement, plan or arrangement by Company or any of its Subsidiaries covering any person that, individually, collectively, or together with this Agreement, could give rise to the payment of any material amount that would not be deductible by Company or any of its Subsidiaries by reason of section 280G of the Code, (vi) neither Company nor any of its Subsidiaries has been a United States real property holding corporation within the meaning of section 897(c)(2) of the Code during the applicable period specified in section 897(c)(1)(A)(ii) of the Code, (vii) none of Company nor any of its Subsidiaries (A) has been a member of an affiliated group (other than the group to which they are currently members) filing a consolidated federal income tax return or (B) has any liability for the income taxes of any person (other than the members of such current group) under Treasury Regulation section 1.1502-6(a) (or any similar provision of state, local or foreign law), as a transferee or successor, by contract, or otherwise, (viii) neither Company nor any of its Subsidiaries has waived any statute of limitations or agreed to any extension of time for assessment in respect of Taxes, (ix) neither Company nor any of its Subsidiaries has entered into any closing or other agreement with any taxing authority which affects any taxable year of Company or its Subsidiaries, (x) neither Company nor any of its Subsidiaries has applied for, been granted , or agreed to any accounting method change since December 31, 2005, and (xi) neither the Company nor any of its Subsidiaries has a consent in effect under Section 341(f) of the Code.

          (i) Certain Agreements . Section 3.1(i) of the Company Disclosure Schedule sets forth a listing of all of the following material contracts and other agreements, oral or written (which are currently in force or which may in the future be operative in any respect) to which Company or any of its Subsidiaries is a party or by or to which Company or any of its Subsidiaries or any of their respective assets or properties are bound or subject: (i) consulting agreements not terminable on six months or less notice involving the payment of more than $25,000 per annum, or union, guild or collective bargaining agreements covering any employees in the United States, (ii) agreements with any officer or other key employee of Company or any of its Subsidiaries (x) providing any term of employment or (y) the benefits of which are contingent, or the terms of which are materially altered, upon the occurrence of a transaction involving Company of the nature contemplated by this Agreement, (iii) any agreement or plan, any of the benefits of which will be increased, or the vesting of the benefits of which will be accelerated, by the occurrence of any of the transactions contemplated by this Agreement or the value of any of the benefits of which will be calculated on the basis of any of the transactions contemplated by this Agreement, (iv) contracts and other agreements for the sale or lease (other than where Company or any of its Subsidiaries is a lessor) of any assets or properties (other than in the ordinary course of business) or for the grant to any person (other than to Company or any of its Subsidiaries) of any preferential rights to purchase any assets or properties, (v) contracts and other agreements relating to the acquisition by Company or any of its Subsidiaries of any operating business or entity or any interest therein, (vi) contracts or other agreements under

which Company or any of its Subsidiaries agrees to indemnify any party, other than in the ordinary course of business, consistent with past practice, or to share a tax liability of any party, (vii) contracts and other agreements containing covenants restricting Company or any of its Subsidiaries from competing in any line of business or with any person in any geographical area or requiring Company or any of its Subsidiaries to engage in any line of business, (viii) contracts or other agreements (other than contracts in the ordinary course of their banking business) relating to the borrowing of money by Company or any of its Subsidiaries, or the direct or indirect guaranty by Company or any of its Subsidiaries of any obligation for, or an agreement by Company or any of its Subsidiaries to service, the repayment of borrowed money, or any other contingent obligations of Company or any of its Subsidiaries in respect of indebtedness of any other person, (ix) contracts or other agreements the termination of which by the Company or any of its Subsidiaries in advance of its stated termination date imposes a termination fee, penalty or similar payment requirement and the amount thereof; and (x) any other material contract or other agreement whether or not made in the ordinary course of business, but shall not include any contract or agreement made with Bank with respect to ordinary and customary deposit arrangements or loan agreements entered into by the Bank in the ordinary course of its business. There have been delivered or made available to Commerce true and complete copies of all of the contracts and other agreements set forth in Section 3.1(i) of the Company Disclosure Schedule and in any other Section of the Company Disclosure Schedule. Except as set forth in Section 3.1(i) of the Company Disclosure Schedule, each such contract and other agreement is in full force and effect and constitutes a legal, valid and binding obligation of Company or its Subsidiaries, as the case may be, and to the best knowledge of Company, each other party thereto, enforceable in accordance with its terms subject, as to enforceability, to bankruptcy, insolvency, and other laws of general applicability relating to or affecting creditors’ rights and to general equity principles. Neither Company nor any Subsidiary of Company has received any written, or, to the knowledge of the Company, any oral, notice of termination or intention to terminate from any other party to such contract or agreement. None of Company or any of its Subsidiaries or, to the best knowledge of Company, any other party to any such contract or agreement is in violation or breach of or default under any such contract or agreement (or with or without notice or lapse of time or both, would be in violation or breach of or default under any such contract or agreement), which violation, breach or default has had or would have, individually or in the aggregate, a Material Adverse Effect on Company.

          (j) Benefit Plans . Section 3.1(j) of the Company Disclosure Schedule lists all the employee benefit plans (as defined in Sections (3)(3) or 3(37) of the Employee Retirement Income Security Act of 1974 (“ERISA”)), health, welfare, supplemental unemployment benefit, bonus, pension, profit sharing, 401(k), deferred compensation, stock compensation, stock purchase, retirement, medical, dental, post-termination benefits (including, but not limited to, medical or dental or life insurance), legal, disability and similar plans or arrangements or practices relating to employees of the Company (“Employees”) or former Employees which Company or its Subsidiaries has established or maintained, or to which Company or its Subsidiaries have contributed or have had any obligation to contribute at any time during the five-year period ending on the date hereof (the “Employee Plans”). Schedule 3.1(j) includes (i) a copy of each written Employee Plan document (and, in the case of any unwritten Employee Plan, a description thereof), (ii) the most recent summary plan description for each Employee Plan if any such description was required, (iii) the most recent Form 5500s (if applicable), (iv) the most recent audited financial reports (if any), (v) any related trust agreements and all amendments

thereto, (vi) the most recent Internal Revenue Service determination letter for each Employee Plan intended to be qualified under Section 401(a) of the Code, and (vii) all other required reports and supporting schedules filed with any governmental agency in respect of the Employee Plans for the three most recent years.

          Except as set out in Schedule 3.1(j):

               (i) All of the Employee Plans are and have been established, registered, qualified, invested and administered, in all material respects, in accordance with their terms and all Laws applicable to the Employee Plans, including without limitation, ERISA, and each Employee Plan which is intended to be qualified under Section 401(a) of the Code satisfies the requirements for such qualification.

               (ii) All obligations regarding the Employee Plans have been satisfied and there are no outstanding defaults or violation of any requirement by any party to any Employee Plan and no Taxes, penalties or fees are owing under or with respect to any of the Employee Plans. No taxes, penalties or fees will become due after Closing based solely on facts in existence on or before Closing. Company and its Subsidiaries (each with respect to the Employee Plans), as well as the Employee Plans, have no material current or threatened liability of any kind to any person, including but not limited to any government agency, other than for payment of benefits in the ordinary course.

               (iii) All contributions or premiums required to be made by the Company or its Subsidiaries under the terms of each Employee Plan have been made in a timely fashion in accordance with ERISA and the terms of the Employee Plans.

               (iv) There have been no improper withdrawals, applications or transfers of assets from any Employee Plan or the trusts or other funding media relating thereto, and neither the Company nor any of its agents has been in breach of any fiduciary obligation with respect to the administration of the Employee Plans or the trusts or other funding media relating thereto.

               (v) No prohibited transaction within the meaning of Section 406 of ERISA or Section 4975 of the Code has occurred with respect to an Employee Plan or any trust created thereunder for which an exemption does not exist.

               (vi) To the knowledge of the Company no Employee Plan, nor any related trust or other funding medium thereunder, is subject to any pending investigation, examination or other proceeding, action or claim initiated by any governmental agency or instrumentality, or by any other party (other than routine claims for benefits), and there exists no state of facts which after notice or lapse of time or both could reasonably be expected to give rise to any such investigation, examination or other proceeding, action or claim.

               (vii) All material filings required by ERISA and the Code as to each Employee Plan have been timely filed, and all material notices and disclosures to participants in the Employee Plans required by ERISA or the Code have been timely provided.

               (viii) Neither the Company nor any other Person that, together with the Company, would be treated as a single employer under Section 414 of the Code, has ever established, maintained or been obligated to contribute to, or otherwise participated in, any multiemployer plan as defined in Section 3(37)(A) of Title I of ERISA and/or any pension plan as described in Section 3(2) of Title I of ERISA.

               (ix) None of the Employee Plans provides medical or other benefits not determinable in advance to Employees who have terminated employment with the Company or to the beneficiaries or dependents of such Employees, other than benefits required to be furnished under Part 6 of Title I of ERISA and/or Section 4980B of the Code.

               (x) No changes to any Employee Plan have been promised and no amendments or changes to an Employee Plan will be made or promised before the Effective Time, except as otherwise permitted by this Agreement or except to the extent agreed to by Commerce in writing.

               (xi) The Employee Plans and each fiduciary (as defined in Section 3(21) of ERISA) of the Employee Plans are in compliance in all material respects with all applicable requirements (including nondiscrimination requirements in effect as of the date hereof) of the Code, including, but not limited to, Sections 79, 105, 106, 125, 401, 501, and 4975 of the Code. For purposes of this Section 3.1(j), noncompliance with the Code or ERISA is material if such noncompliance could have a Material Adverse Effect on the condition of one or more of the Employee Plans or of Company or its Subsidiaries, either as of the Effective Time or upon discovery of the noncompliance.

               (xii) All assets of any retirement plan may be readily liquidated within five (5) business days without incurring any penalty or cost, other than ordinary sales commission expenses.

               (xiii) There is no impediment to termination of any Employee Plan by action of the Company’s board of directors.

          (k) Subsidiaries . Section 3.1(k) of the Company Disclosure Schedule lists all the Subsidiaries of Company. Except as listed on Section 3.1(k) of the Company Disclosure Schedule, Company owns, directly or indirectly, beneficially and of record 100% of the issued and outstanding voting securities of each such Subsidiary. All of the shares of capital stock of each of the Subsidiaries held by Company or by another of its Subsidiaries are fully paid and, except as provided by Section 220 of the Oklahoma Banking Code, nonassessable and are owned by Company or one of its Subsidiaries free and clear of any lien, claim or other encumbrance. Except as set forth in Section 3.1(k) of the Company Disclosure Schedule, neither Company nor any of its Subsidiaries owns any shares of capital stock or other equity securities of any person (other than, in the case of Company, the capital stock of its Subsidiaries and, in the case of such Subsidiaries, shares or equity securities acquired in satisfaction of debts previously contracted in good faith in the ordinary course of their banking business).

          (l) Agreements with Bank or Other Regulators . Except as set forth in Section 3.1(l) of the Company Disclosure Schedule, neither Company nor any Subsidiary of

Company is a party to any written agreement or memorandum of understanding with, or a party to any commitment letter or similar undertaking to, or is subject to any order or directive by, or is a recipient of any extraordinary supervisory letter from, or has adopted any board resolutions at the request of, any Bank Regulator which restricts materially the conduct by Company or its Subsidiaries of their businesses, or in any manner relates to their capital adequacy, credit policies, community reinvestment, loan underwriting or documentation or management, nor has Company or any such Subsidiary been advised by any Bank Regulator that it is contemplating issuing or requesting (or is considering the appropriateness of issuing or requesting) any such order, decree, agreement, memorandum of understanding, extraordinary supervisory letter, commitment letter or similar submission, or any such board resolutions.

          (m) Absence of Certain Changes or Events . Except as set forth in Section 3.1(m) of the Company Disclosure Schedule, since December 31, 2005 (i) there has not been any change, or any event involving a prospective change, in the business, financial condition or results of operations or, to the knowledge of the Company, prospects of Company or any of its Subsidiaries or in the relationship of Company or its Subsidiaries with respect to their employees, creditors, suppliers, distributors, customers or others with whom they have business relationships, which has had, or would be reasonably likely to have, a Material Adverse Effect on Company, (ii) Company and each of its Subsidiaries have conducted their respective businesses in the ordinary course consistent with their past practices and neither Company nor any of its Subsidiaries has taken any action or entered into any transaction, and, to the knowledge of Company, no event has occurred, that would have required Commerce or Sub’s consent pursuant to Section 4.1 of this Agreement if such action had been taken, transaction entered into or event had occurred, in each case, after the date of this Agreement, nor has Company or any of its Subsidiaries entered into any agreement, plan or arrangement to do any of the foregoing, (iii) there have been no dividends or other distributions declared, set aside or paid in respect of Company Common Stock, nor has any action with respect to Company Common Stock proscribed by Section 4.1 of this Agreement occurred or been taken, and (iv) Company and its Subsidiaries have not entered into any employment contract with any director, officer or salaried employee, paid any or made any accrual or arrangement for payment of bonuses or special compensation of any kind or any severance or termination pay to any of their officers, employees or director