FIRST FINANCIAL BANCORPORATION /IA/
8-K, 1998-05-18
STATE COMMERCIAL BANKS
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                                    FORM 8-K

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 25049


                                 CURRENT REPORT


                       Pursuant to Section 13 or 15(d) of
                           the Securities Act of 1934

Date of Report (Date of earliest event reported): May 7, 1998.


                         First Financial Bancorporation
             ------------------------------------------------------

             (Exact name of registrant as specified in its charter)


        Iowa                       0-14280                   42-1259867
- -----------------------------   ---------------       --------------------------
(State or other jurisdiction   (Commission file       RS Employer Identification
 of incorporation)                 Number)                    Number)

204 East Washington Street, Iowa City, Iowa      52244-1880
- -------------------------------------------     -----------
(Address of principal executive offices)          Zip Code

Registrant's telephone number, including area code:  (319) 356-9000
                                                     --------------

                   Not applicable
- ------------------------------------------------------------
(Former name or former address, if changed since last report)


                                        1

<PAGE>

     On May 7, 1998, First Financial Bancorporation, a corporation organized and
existing under the laws of the State of Iowa ("First Financial"), and Mercantile
Bancorporation, a corporation organized and existing under the laws of the State
of Missouri ("Mercantile"),  and each registered as a bank holding company under
the Bank Holding Company Act of 1956, as amended,  entered into an Agreement and
Plan of Merger (the "Merger Agreement"),  pursuant to which First Financial will
be merged  with  Ameribanc,  Inc.,  a Missouri  corporation  and a wholly  owned
subsidiary  of  Mercantile  (the  "Merger").  The  Board of  Directors  of First
Financial approved the Merger at its meeting held on May 4, 1998.

     In  accordance  with the terms of the Merger  Agreement,  (i) each share of
First Financial common stock, par value $1.25 per share ("First Financial Common
Stock"),  outstanding immediately prior to the effective time of the Merger (the
"Effective  Time") will be  converted  into the right to receive 0.88 of a share
(the  "Exchange  Ratio") of Mercantile  common stock,  par value $5.00 per share
("Mercantile Common Stock"),  and the associated preferred share purchase rights
under Mercantile's Rights Agreement, dated May 23, 1988.

     The Merger is intended to  constitute a tax-free  reorganization  under the
Internal Revenue Code of 1986, as amended,  and to be accounted for as a pooling
of interests.

     Consummation of the Merger is subject to various conditions, including: (i)
receipt of  approval  by the  shareholders  of First  Financial  of  appropriate
matters  relating  to the  Merger  Agreement  and the  Merger;  (ii)  receipt of
requisite  regulatory  approvals  from the  Board of  Governors  of the  Federal
Reserve system and other federal and state regulatory  authorities as necessary;
(iii)  receipt  of an opinion  of  counsel  as to the tax  treatment  of certain
aspects of the Merger;  (iv)  registration  of the shares of  Mercantile  Common
Stock to be issued in the Merger under the  Securities  Act of 1933,  as amended
(the  "1933  Act");  and (v)  satisfaction  of  certain  other  conditions.  The
directors of First  Financial have agreed with  Mercantile to vote all shares of
First  Financial  Common  Stock owned by them for the approval of the Merger and
not to sell  any of such  shares  other  than  pursuant  to the  Merger  without
Mercantile's consent.

     The Merger  Agreement  and the  transactions  contemplated  thereby will be
submitted  for  approval at a meeting of the  shareholders  of First  Financial.
Prior to such meeting,  Mercantile  will file a registration  statement with the
Securities and Exchange Commission registering under the 1933 Act the Mercantile
stock to be issued  in the  Merger.  Such  shares of  Mercantile  stock  will be
offered to First Financial  shareholders pursuant to a prospectus that will also
serve as a proxy statement for the shareholder's meeting.

     The preceding description of the Merger Agreement is qualified its entirety
by reference to the copy of the Merger Agreement  included as Exhibit 2.1 hereto
and which is hereby incorporated herein by reference.

     In connection  with the Merger  Agreement,  First  Financial and Mercantile
entered  into a Stock  Option  Agreement,  dated May 7, 1998 (the "Stock  Option
Agreement"),  pursuant  to  which  First  Financial  granted  to  Mercantile  an
irrevocable  option to  purchase,  under  certain  circumstances,  up to 707,189
shares  of First  Financial  Common  Stock at a price of $37.75  per share  (the
"Mercantile


                                        2

<PAGE>

Option"). The Mercantile Option, if exercised, would equal, before giving effect
to the exercise of the Mercantile Option, 19.9% of the total number of shares of
First Financial Common Stock issued and outstanding at the time of exercise. The
Mercantile  Option was granted by First  Financial as a condition and inducement
to Mercantile's  willingness to enter into the Merger  Agreement.  Under certain
circumstances,  First  Financial  may be required to repurchase  the  Mercantile
Option or the shares acquired pursuant to the exercise of the Mercantile Option.

     The preceding description of the Stock Option Agreement is qualified in its
entirety by  reference  to the copy of the Stock  Option  Agreement  included as
Exhibit 2.2 hereto and which is hereby incorporated herein by reference.


                                        3
<PAGE>



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

        (a) -- (b) Not applicable.

        (c)    Exhibits.

              2.1   Agreement and Plan of Merger dated as of May 7, 1998,  among
                    Mercantile  Bancorporation,  Inc., Ameribanc, Inc. and First
                    Financial Bancorporation.

              2.2   Stock Purchase  Agreement  dated as of May 7, 1998,  between
                    Mercantile  Bancorporation,  Inc.,  as  grantee,  and  First
                    Financial Bancorporation, as issuer.

             99.1   Text of press  release  dated May 8,  1998,  issued by First
                    Financial Bancorporation.





                                        4

<PAGE>



                                    SIGNATURE

        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.

                                                 FIRST FINANCIAL BANCORPORATION


Date:  May 15, 1998                              By:\\Robert M. Sierk
       ------------                                 --------------------
                                                      Robert M. Sierk
                                                      President and
                                                      Chief Executive Officer



                                        5

<PAGE>


                                  EXHIBIT INDEX
                                                                    Sequentially
Exhibit                                                               Numbered
Number     Description of Exhibit                                       Page

2.1        Agreement and Plan of Merger dated as of May 7,                12
           1998 among Mercantile Bancorporation, Inc.,
           Ameribanc, Inc. and First Financial Bancorporation.

2.2        Stock Purchase Agreement dated as of May 7, 1998 among         56
           Mercantile Bancorporation, Inc., as grantee, and First
           Financial Bancorporation, as issuer.

99.1       Text of press release dated May 8, 1998, issued by First       64
           Financial Bancorporation.



















































                                        6
<PAGE>
                                   EXHIBIT 2.1

                          AGREEMENT AND PLAN OF MERGER

                                      among

                         MERCANTILE BANCORPORATION INC.,
                             a Missouri corporation

                                       and

                                AMERIBANC, INC.,
                             a Missouri corporation

                                       and

                         FIRST FINANCIAL BANCORPORATION,
                               an Iowa corporation




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



                                   May 7, 1998
























                                       7

<PAGE>

                                TABLE OF CONTENTS

                                                                          Page 
Recitals....................................................................12

                                    ARTICLE I
                                    ---------
                                   THE MERGER
    1.01   The Merger.......................................................12
           ----------                                                     
    1.02   Closing..........................................................12
           -------                                                        
    1.03   Effective Time...................................................12
           --------------                                                 
    1.04   Additional Actions...............................................13
           ------------------                                             
    1.05   Articles of Incorporation and By-Laws............................13
           -------------------------------------                          
    1.06   Board of Directors and Officers..................................13
           -------------------------------                                
    1.07   Conversion of Securities.........................................13
           ------------------------                                       
    1.08   Exchange Procedures..............................................14
           -------------------                                            
    1.09   No Fractional Shares.............................................15
           --------------------                                           
    1.10   Dissenting Shares................................................15
           -----------------                                              
    1.11   Closing of Stock Transfer Books..................................15
           -------------------------------                                
    1.12   Anti-Dilution....................................................16
           -------------                                                  
    1.13   Reservation of Right to Revise Transaction.......................16
           ------------------------------------------                     
    1.14   Material Adverse Effect..........................................16
           -----------------------                                        
    1.15   Knowledge........................................................16
           ---------                                                      
                                   ARTICLE II
                                   ----------
                    REPRESENTATIONS AND WARRANTIES OF SELLER

    2.01   Organization and Authority.......................................17
           --------------------------                                     
    2.02   Subsidiaries.....................................................17
           ------------                                                   
    2.03   Capitalization...................................................17
           --------------                                                 
    2.04   Authorization....................................................18
           -------------                                                  
    2.05   Seller Financial Statements......................................19
           ---------------------------                                    
    2.06   Seller Reports...................................................19
           --------------                                                 
    2.07   Title to and Condition of Assets.................................20
           --------------------------------                               
    2.08   Real Property....................................................20
           -------------                                                 
    2.09   Taxes............................................................21
           -----                                                         
    2.10   Material Adverse Effect..........................................22
           -----------------------                                       
    2.11   Loans, Commitments and Contracts.................................22
           --------------------------------                              
    2.12   Absence of Defaults..............................................24
           -------------------                                           
    2.13   Litigation and Other Proceedings.................................24
           --------------------------------                              

                                        8

<PAGE>
                                                                         Page
    2.14   Directors' and Officers' Insurance..............................24
           ----------------------------------                              
    2.15   Compliance with Laws............................................24
           --------------------                                            
    2.16   Labor...........................................................26
           -----                                                           
    2.17   Material Interests of Certain Persons...........................26
           -------------------------------------                           
    2.18   Allowance for Loan and Lease Losses;
           ------------------------------------
           Non-Performing Assets; Financial Assets.........................26
           ---------------------------------------
    2.19   Employee Benefit Plans..........................................27
           ----------------------                                          
    2.20   Conduct of Seller to Date.......................................28
           -------------------------                                       
    2.21   Absence of Undisclosed Liabilities..............................29
           ----------------------------------                              
    2.22   Proxy Statement, Etc............................................29
           ---------------------                                           
    2.23   Registration Obligations........................................30
           ------------------------                                         
    2.24   Tax, Regulatory and Accounting Matters..........................30
           --------------------------------------                          
    2.25   Brokers and Finders.............................................30
           -------------------                                             
    2.26   Interest Rate Risk Management Instruments.......................30
           -----------------------------------------                       
    2.27   Accuracy of Information.........................................30
           -----------------------                                         
    2.28   Year 2000 Compliant.............................................30
           -------------------                                             

                                   ARTICLE III
                  REPRESENTATIONS AND WARRANTIES OF THE BUYERS

    3.01   Organization and Authority......................................31
           --------------------------                                      
    3.02   Capitalization of Mercantile....................................31
           ----------------------------                                    
    3.03   Authorization...................................................32
           -------------                                                   
    3.04   Mercantile Financial Statements.................................32
           -------------------------------                                 
    3.05   Mercantile Reports..............................................33
           ------------------                                              
    3.06   Material Adverse Effect.........................................33
           -----------------------                                         
    3.07   Registration Statement, Etc.....................................33
           ---------------------------                                    
    3.08   Brokers and Finders.............................................33
           -------------------                                             
    3.09   Accuracy of Information.........................................33
           -----------------------                                        
 
                                   ARTICLE IV
                CONDUCT OF BUSINESSES PRIOR TO THE EFFECTIVE TIME

    4.01   Conduct of Businesses Prior to the Effective Time...............33
           -------------------------------------------------               
    4.02   Forbearances of Seller..........................................33
           ----------------------                                          
    4.03   Forbearances of the Buyers......................................35
           --------------------------
                                    
                                    ARTICLE V
                              ADDITIONAL AGREEMENTS

    5.01   Access and Information; Due Diligence...........................36
           -------------------------------------                          
               
                                       9
<PAGE>
                                                                         Page
    5.02   Registration Statement; Regulatory Matters......................36
           ------------------------------------------ 
    5.03   Shareholder Approval............................................37
           --------------------   
    5.04   Current Information.............................................37
           -------------------                                             
    5.05   Conforming Entries..............................................37
           ------------------      
    5.06   Environmental Reports...........................................38
           ---------------------                                           
    5.07   Agreements of Affiliates........................................38
           ------------------------                                        
    5.08   Expenses........................................................38
           --------                                                        
    5.09   Miscellaneous Agreements and Consents...........................39
           -------------------------------------                           
    5.10   Employee Agreements and Benefits................................39
           --------------------------------                                
    5.11   Press Releases..................................................40
           --------------                                                  
    5.12   State Takeover Statutes.........................................40
           -----------------------                                         
    5.13   Directors' and Officers' Indemnification........................40
           ----------------------------------------                        
    5.14   Tax Opinion Certificates........................................40
           ------------------------                                        
    5.15   Employee Stock Options..........................................40
           ----------------------                                          
    5.16   Best Efforts to Insure Pooling..................................41
           ------------------------------
                                   ARTICLE VI
                                   CONDITIONS
    6.01   Conditions to Each Party's Obligation To Effect the Merger......41
           ----------------------------------------------------------      
    6.02   Conditions to Obligations of Seller.............................41
           -----------------------------------                             
    6.03   Conditions to Obligations of the Buyers.........................41
           ---------------------------------------                        
                                   ARTICLE VII
                        TERMINATION, AMENDMENT AND WAIVER
    7.01   Termination.....................................................43
           -----------                                                     
    7.02   Effect of Termination...........................................43
           ---------------------                                           
    7.03   Amendment.......................................................43
           ---------                                                       
    7.04   Waiver..........................................................43
           ------                                                        
                                  ARTICLE VIII
                               GENERAL PROVISIONS
    8.01   Non-Survival of Representations, Warranties and Agreements......44
           ----------------------------------------------------------      
    8.02   Indemnification.................................................44
           ---------------                                                 
    8.03   No Assignment; Successors and Assigns...........................44
           -------------------------------------                           
    8.04   Severability....................................................44
           ------------                                                    
    8.05   No Implied Waiver...............................................45
           -----------------                                               
    8.06   Headings........................................................45
           --------                                                        
    8.07   Entire Agreement................................................45
           ----------------                                                
    8.08   Counterparts....................................................45
           ------------                                                    
    8.09   Notices.........................................................45
           -------                                                         
    8.10   Governing Law...................................................46
           -------------                                                   
                                       10

<PAGE>


                                                                         

LIST OF EXHIBITS                                                         Page

Exhibit A - Affiliate Letter                                               47 
Exhibit B - Director/Officer Certificate                                   49
Exhibit C - Legal Opinion of Buyers' Counsel                               50
Exhibit D - Legal Opinion of Seller's Counsel                              53


LIST OF SCHEDULES

Schedule 2.01         Articles/Bylaws                                      --   
Schedule 2.02         Subsidiaries/Equity Securities                       --
Schedule 2.03         Seller Stock Plans                                   --
Schedule 2.04(b)      Authorizations                                       --   
Schedule 2.05(a)      Seller Financial Statements                          --   
Schedule 2.08(a)      Owned Real Property/Leased Real Property             --
Schedule 2.08(c)      Interests in Real Property                           --
Schedule 2.09         Taxes                                                --
Schedule 2.11(a)      Deposits/Commitments                                 --
Schedule 2.11(b)      Contracts                                            --
Schedule 2.11(c)      Insurance                                            --
Schedule 2.11(f)      Loans                                                --
Schedule 2.13         Litigation                                           --
Schedule 2.15(c)      Compliance with Laws                                 --
Schedule 2.18(c)      Real Estate Acquired through Foreclosure and
                      Repossession                                         --
Schedule 2.18(f)      Investment Securities                                --
Schedule 2.19(a)      Employee Benefit Plans                               --
Schedule 2.19(d)      Post-Retirement Health and Medical Benefits          --
Schedule 2.19(f)      Change in Control Payments                           --
Schedule 2.20         Conduct of Seller                                    --
Schedule 2.26(a)      Derivative Securities                                --
Schedule 2.28         Material Computer Software, Firmware and Hardware    --
Schedule 4.02         Forbearances of Seller                               --
Schedule 5.07         Affiliates                                           --















                                       11
<PAGE>

                                   

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

     This AGREEMENT AND PLAN OF MERGER (this "Agreement"), made and entered into
as of May 7,  1998 by and  among  Mercantile  Bancorporation  Inc.,  a  Missouri
corporation  ("Mercantile"),  Ameribanc,  Inc., a Missouri  corporation ("Merger
Sub" and,  collectively,  with  Mercantile,  the "Buyers"),  and First Financial
Bancorporation ("First Financial"), an Iowa corporation ("Seller").

     WHEREAS, Merger Sub is a wholly owned subsidiary of Mercantile, and each of
Mercantile  and Merger Sub is a registered  bank holding  company under the Bank
Holding Company Act of 1956, as amended (the "BHCA"); and

     WHEREAS, Seller is registered as a bank holding company under the BHCA; and

     WHEREAS,  the  respective  Boards of Directors of Seller and Merger Sub and
the Executive  Committee of the Board of Directors of  Mercantile  have approved
the merger (the  "Merger")  of Seller  with and into Merger Sub  pursuant to the
terms and subject to the conditions contained in this Agreement; and

     WHEREAS,  the parties desire to provide certain  undertakings,  conditions,
representations,  warranties and covenants in connection  with the  transactions
contemplated by this Agreement.

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

                                    ARTICLE I
                                    ---------
                                   THE MERGER

     1.01 The Merger.  Subject to the terms and  conditions  of this  Agreement,
Seller shall be merged with and into Merger Sub in  accordance  with Chapter 351
of the Missouri Revised  Statutes (the "Missouri  Statute") and Section 490.1106
of the Iowa Business  Corporation Act (the "IBCA"),  and the separate  corporate
existence of Seller shall cease.  Merger Sub shall be the surviving  corporation
in the Merger (sometimes hereinafter referred to as the "Surviving Corporation")
and shall continue to be governed by the laws of the State of Missouri.

     1.02 Closing. The closing (the "Closing") of the Merger, unless the parties
hereto  shall  otherwise  mutually  agree,  shall take  place at the  offices of
Mercantile in St. Louis, Missouri, at 10:00 am, local time, on the date that the
Effective Time (as defined in Section 1.03) occurs (the "Closing Date").

     1.03  Effective  Time. The Merger shall become  effective  (the  "Effective
Time")  upon the later of (i) the  issuance  of a  Certificate  of Merger by the
Office of the Secretary of State of the State of Missouri and (ii) the filing of
Articles of Merger  with the Office of the  Secretary  of State of Iowa.  Unless
otherwise mutually agreed in writing by Buyers and Seller,  subject to the terms
and conditions of this Agreement, the Effective Time shall occur on such date as
Buyers shall notify  Seller in writing (such notice to be at least five business
days in advance of the Effective Time) but (A) not earlier than the satisfaction
of all conditions set forth in Section 6.01(a) and 6.01(b) (the "Approval Date")
and (B) not later than the first  business day of the first full calendar  month
commencing at least five  business days after the Approval  Date. On the Closing
Date,  the parties  hereto will cause the Merger to be consummated by delivering
to the Secretary of State of the State of Missouri and the Secretary of State of
the State of Iowa, for filing,  Articles of Merger, in such form as required by,
and executed and acknowledged in accordance with, the relevant provisions of the
Missouri Statute and the IBCA.

                                       12
<PAGE>

     1.04  Additional  Actions.  If, at any time after the Effective  Time,  the
Surviving  Corporation  shall  consider or be advised  that any  further  deeds,
assignments or assurances in law or any other acts are necessary or desirable to
(a)  vest,  perfect  or  confirm,  of  record  or  otherwise,  in the  Surviving
Corporation  its right,  title or  interest  in, to or under any of the  rights,
properties  or assets of Seller or Merger  Sub, or (b)  otherwise  carry out the
purposes of this  Agreement,  Seller and its  officers  and  directors  shall be
deemed to have granted to the  Surviving  Corporation  an  irrevocable  power of
attorney to execute and deliver all such deeds, assignments or assurances in law
and to do all acts necessary or proper to vest,  perfect or confirm title to and
possession of such rights, properties or assets in the Surviving Corporation and
otherwise  to carry out the  purposes of this  Agreement,  and the  officers and
directors of the Surviving  Corporation  are authorized in the name of Seller or
otherwise to take any and all such action.

     1.05 Articles of Incorporation  and By-Laws.  The Articles of Incorporation
and  By-Laws of Merger Sub in effect  immediately  prior to the  Effective  Time
shall be the Articles of Incorporation  and ByLaws of the Surviving  Corporation
following the Merger, unless otherwise repealed or amended.

     1.06 Board of Directors and Officers.  At the Effective Time, the directors
and officers of Merger Sub immediately  prior to the Effective Time shall be the
directors and officers, respectively, of the Surviving Corporation following the
Merger, and such directors and officers shall hold office in accordance with the
Surviving Corporation's By-Laws and applicable law.

     1.07  Conversion of  Securities.  At the  Effective  Time, by virtue of the
Merger and without any action on the part of the Buyers, Seller or the holder of
any of the following securities:

          (a) Each share of the  common  stock,  $1.00 par value,  of Merger Sub
     that is issued and  outstanding  immediately  prior to the  Effective  Time
     shall remain  outstanding and shall be unchanged after the Merger and shall
     thereafter  constitute all of the issued and  outstanding  capital stock of
     the Surviving Corporation; and

          (b)  Subject to Sections  1.09,  1.10 and 1.12  hereof,  each share of
     common stock, $1.25 par value, of Seller ("Seller Common Stock") issued and
     outstanding  immediately prior to the Effective Time, other than Dissenting
     Shares (as defined in Section 1.10 hereof),  shall cease to be  outstanding
     and shall be  converted  into and become the right to receive  0.88  shares
     (the "Exchange Ratio") of common stock, $0.01 par value, and the associated
     "Rights"  under the  "Rights  Agreement,"  as those  terms are  defined  in
     Section  3.02  hereof,  of  Mercantile  (collectively,  "Mercantile  Common
     Stock");  provided,  however,  that any Seller Common Stock held by Seller,
     Mercantile or any of their  respective  Subsidiaries (as defined in Section
     2.02  hereof),  in each case other  than in a  fiduciary  capacity  or as a
     result of debts previously  contracted,  shall be canceled and shall not be
     exchanged for shares of Mercantile  Common  Stock.  The Exchange  Ratio was
     computed by (i) aggregating (A) the total number of shares of Seller Common
     Stock that were issued and  outstanding  on the date of this  Agreement (as
     set forth in Section  2.03  hereof)  with (B) the total number of shares of
     Seller  Common Stock that are reserved for issuance  pursuant to options or
     other rights relating to Seller Common Stock and outstanding as of the date
     of this  Agreement  (as set forth in Section 2.03 hereof) and dividing such
     number of shares of Seller Common Stock  (computed by  aggregating  (A) and
     (B) hereof (the "Fully Diluted Shares")) into (ii) 3,194,844, the aggregate
     number of shares of Mercantile Common Stock to be issued in the Merger.

                                       13
<PAGE>
     1.08 Exchange Procedures.
          -------------------

          (a) As soon as practicable  following the Effective  Time,  Mercantile
     shall  mail or cause to be mailed  to  holders  of  record of  certificates
     formerly  representing  Seller  Common  Stock  (the   "Certificates"),   as
     identified on the Seller  Shareholder List (as provided pursuant to Section
     1.11(b) hereof),  letters advising them of the  effectiveness of the Merger
     and  instructing  them to tender such  Certificates  to  Mercantile's  duly
     appointed exchange agent (the "Exchange Agent"),  or in lieu thereof,  such
     evidence of lost, stolen or mutilated  Certificates and such surety bond or
     other security as the Exchange Agent may reasonably  require (the "Required
     Documentation").

          (b)  Subject  to  Sections  1.09,  1.10 and  1.12  hereof,  after  the
     Effective Time, each previous holder of a Certificate  that surrenders such
     Certificate or in lieu thereof, the Required Documentation, to the Exchange
     Agent,  with a properly  completed and executed letter of transmittal  with
     respect  to  such  Certificate,  will  be  entitled  to  a  certificate  or
     certificates  representing  the number of full shares of Mercantile  Common
     Stock into which the  Certificate so surrendered  shall have been converted
     pursuant to this Agreement,  and any distribution  theretofore declared and
     not yet paid with respect to such shares of Mercantile Common Stock and any
     amount  due  with   respect  to   fractional   shares,   without   interest
     (collectively,  the  "Merger  Consideration").  Such  shares of  Mercantile
     Common  Stock,  any amount due with  respect to  fractional  shares and any
     distribution  shall be delivered by the Exchange  Agent to each such holder
     as promptly as practicable after such surrender.

          (c)  Each  outstanding  Certificate,  until  duly  surrendered  to the
     Exchange  Agent,  shall be  deemed  to  evidence  ownership  of the  Merger
     Consideration   into  which  the  stock  previously   represented  by  such
     Certificate shall have been converted pursuant to this Agreement.

          (d) After the Effective Time,  holders of Certificates  shall cease to
     have  rights  with  respect  to the stock  previously  represented  by such
     Certificates,  and their sole rights shall be to exchange such Certificates
     for the  Merger  Consideration  to which the  shareholder  may be  entitled
     pursuant to the provisions of Section 1.07 hereof. After the closing of the
     transfer  books as  described  in Section  1.11  hereof,  there shall be no
     further  transfer  on the  records of Seller of  Certificates,  and if such
     Certificates  are presented to Seller for transfer,  they shall be canceled
     against  delivery  of the  Merger  Consideration.  Neither  Buyers  nor the
     Exchange Agent shall be obligated to deliver the Merger Consideration until
     such  holder   surrenders  the   Certificates  or  furnishes  the  Required
     Documentation  as provided herein.  No dividends or distributions  declared
     after the Effective  Time  (including  any  redemption by Mercantile of the
     Rights  associated  therewith)  on the  Mercantile  Common  Stock  will  be
     remitted to any person  entitled to receive  Mercantile  Common Stock under
     this Agreement until such person  surrenders the  Certificate  representing
     the right to receive such Mercantile Common Stock or furnishes the Required
     Documentation,  at which  time such  dividends  or  distributions  shall be
     remitted to such person,  without interest and less any taxes that may have
     been imposed thereon. Certificates surrendered for exchange by an affiliate
     shall not be exchanged until Buyers have received a written  agreement from
     such  affiliate as required  pursuant to Section  5.07 hereof.  Neither the
     Exchange  Agent nor any party to this  Agreement nor any affiliate  thereof
     shall be liable to any holder of stock  represented by any  Certificate for
     any Merger Consideration  issuable or payable in the Merger that is paid to
     a public official  pursuant to applicable  abandoned  property,  escheat or
     similar laws.


                                       14
<PAGE>


     1.09 No  Fractional  Shares.  Notwithstanding  any other  provision of this
Agreement,  neither  certificates nor scrip for fractional  shares of Mercantile
Common Stock shall be issued in the Merger.  Each holder of Seller  Common Stock
who  otherwise  would have been  entitled to a fraction of a share of Mercantile
Common  Stock shall  receive (by check from the  Exchange  Agent,  mailed to the
shareholder  with the  certificate(s)  for  Mercantile  Common  Stock which such
holder is to receive  pursuant to the  Merger) in lieu  thereof,  cash  (without
interest) in an amount  determined by multiplying the fractional  share interest
to which such holder would  otherwise be entitled by the closing  stock price of
Mercantile  Common Stock on the New York Stock  Exchange (the "NYSE")  Composite
Tape as reported in The Wall Street  Journal on the Closing Date. No such holder
shall be entitled to dividends,  voting rights or any other rights in respect of
any fractional share.

     1.10 Dissenting Shares.
          ------------------

          (a)  "Dissenting  Shares" means any shares of Seller Common Stock held
     by any holder  who  becomes  entitled  to payment of the fair value of such
     shares under  Division XIII of the IBCA.  Any holders of Dissenting  Shares
     shall be entitled  to payment for such shares only to the extent  permitted
     by and in accordance  with the provisions of the IBCA;  provided,  however,
     that if, in accordance with the IBCA, any holder of Dissenting Shares shall
     forfeit such right to payment of the fair value of such Dissenting  Shares,
     such shares shall  thereupon be deemed to have been  converted  into and to
     have  become  exchangeable  for,  as of the  Effective  Time,  the right to
     receive the Merger Consideration.

          (b) Seller shall give to  Mercantile  (i) prompt notice of any written
     objections to the Merger and/or any written  demands for the payment of the
     fair  value of any  shares  of Seller  Common  Stock,  withdrawals  of such
     demands,  and any other instruments served pursuant to Division XIII of the
     IBCA received by Seller,  and (ii) the  opportunity  to  participate in all
     negotiations  and proceedings  with respect to such demands under the IBCA.
     Seller shall not  voluntarily  make any payment with respect to demands for
     payment  of fair  value and shall  not,  except  with the prior  consent of
     Mercantile, settle or offer to settle any such demands.

     1.11 Closing of Stock Transfer Books.

          (a) The stock  transfer  books of Seller shall be closed at the end of
     business on the business day immediately preceding the Closing Date. In the
     event of a  transfer  of  ownership  of  Seller  Common  Stock  that is not
     registered  in the  transfer  records  prior to the  closing of such record
     books,  the Merger  Consideration  issuable or payable with respect to such
     stock  may  be  delivered  to  the   transferee,   if  the  Certificate  or
     Certificates  representing  such stock is presented  to the Exchange  Agent
     accompanied by all documents  required to evidence and effect such transfer
     and all applicable stock transfer taxes are paid.

          (b) At the Effective Time, Seller shall provide Buyers with a complete
     and verified list of  registered  holders of Seller Common Stock based upon
     its stock  transfer  books or  corporate  records as of the closing of said
     transfer  books,  including  the names,  addresses,certificate  numbers and
     taxpayer  identification  numbers of such holders (the "Seller  Shareholder
     List").  Buyers shall be entitled to rely upon the Seller  Shareholder List
     to establish the identity of those  persons  entitled to receive the Merger
     Consideration,  which list shall be conclusive with respect thereto. In the
     event of a dispute with respect to  ownership of stock  represented  by any
     Certificate,  Buyers shall be entitled to deposit any Merger  Consideration
     represented   thereby  in  escrow  with  an  independent  third  party  and
     thereafter be relieved with respect to any claims thereto.

                                       15
<PAGE>

     1.12 Anti-Dilution. If between the date of this Agreement and the Effective
Time a share of Mercantile Common Stock shall be changed into a different number
of shares of Mercantile Common Stock or a different class of shares by reason of
reclassification, recapitalization, split-up, combination, exchange of shares or
readjustment,  or if a stock  dividend  thereon  shall be declared with a record
date within such  period,  then  appropriate  and  proportionate  adjustment  or
adjustments  will be made to the Exchange  Ratio such that each holder of Seller
Common  Stock shall be entitled to receive  such number of shares of  Mercantile
Common  Stock  or other  securities  as such  shareholder  would  have  received
pursuant  to such  reclassification,  recapitalization,  split-up,  combination,
exchange of shares or readjustment or as a result of such stock dividend had the
record date therefor been immediately following the Effective Time.

     1.13  Reservation  of Right to Revise  Transaction.  Buyers may at any time
change the method of effecting the  acquisition of Seller by Buyers  (including,
without  limitation,  the  provisions  of this  Article  I) if and to the extent
Buyers deem such  change to be  desirable,  including,  without  limitation,  to
provide for (i) a merger of Merger Sub with and into Seller,  in which Seller is
the surviving corporation,  or (ii) a merger of Seller directly into Mercantile,
in which Mercantile is the surviving  corporation;  provided,  however,  that no
such  change  shall  (A)  alter  or  change  the  amount  or kind of the  Merger
Consideration  to be  received  by the  holders  of  Seller  Common  Stock,  (B)
adversely  affect  the  tax  treatment  to  Seller  shareholders,  as  generally
described in Section 6.01(e) hereof,  (C) materially  impede or delay receipt of
any  approvals  referred  to in  Section  6.01(b)  or  the  consummation  of the
transactions  contemplated  by this  Agreement,  or (D)  prevent  or impede  the
transactions   contemplated  hereby  from  qualifying  for  pooling-of-interests
accounting  treatment unless Buyers first waive Seller's  covenants set forth in
Sections  5.02(b) and 5.16 hereof and the  condition  to Buyers'  obligation  to
consummate the Merger set forth in Section 6.03(f) hereof.

     1.14 Material Adverse Effect. As used in this Agreement, the term "Material
Adverse Effect" with respect to an entity means any condition,  event, change or
occurrence  that has or may  reasonably  be expected to have a material  adverse
effect on the  condition  (financial  or  otherwise),  properties,  business  or
results of  operations,  of such  entity  and its  Subsidiaries  (as  defined in
Section  2.02(a)),  taken  as a  whole  as  reflected  in the  Seller  Financial
Statements  (as  defined  in  Section  2.05(b))  or  the  Mercantile   Financial
Statements (as defined in Section 3.04), as the case may be; it being understood
that a Material Adverse Effect shall not include:  (i) a change with respect to,
or effect on, such entity and its  Subsidiaries  resulting from a change in law,
rule,  regulation,   generally  accepted  accounting  principles  or  regulatory
accounting principles;  (ii) a change with respect to, or effect on, such entity
and its  Subsidiaries  resulting  from any  other  matter  affecting  depository
institutions  generally  including,  without  limitation,   changes  in  general
economic  conditions and changes in prevailing interest and deposit rates; (iii)
a  change  disclosed  in the  Seller  Financial  Statements  or  the  Mercantile
Financial  Statements,  as the case may be; (iv) any charges taken by Mercantile
in  connection  with pending or completed  acquisitions  or the  disposition  of
certain  businesses  or lines of  business;  or (v) in the case of  Seller,  any
financial  change  resulting from  adjustments  made pursuant to Section 5.05 or
5.09(b) hereof.

     1.15 Knowledge.  As used in this Agreement,  the term  "knowledge" or "best
knowledge"  shall mean those facts known by the executive  officers of Buyers or
Seller, as the case may be.

                                       16
<PAGE>
                                   ARTICLE II
                                   ----------
                    REPRESENTATIONS AND WARRANTIES OF SELLER

               Seller hereby represents and warrants to the Buyers as follows:

     2.01  Organization  and Authority.  Seller is a corporation duly organized,
validly  existing and in good  standing  under the laws of the State of Iowa, is
duly qualified to do business and is in good standing in all jurisdictions where
its ownership or leasing of property or the conduct of its business  requires it
to be so  qualified,  except where the failure of Seller to so qualify would not
have a Material Adverse Effect on Seller and the Seller Subsidiaries (as defined
in Section 2.02(a)), taken as a whole, and has the corporate power and authority
to own its properties and assets and to carry on its business as it is now being
conducted.  Seller is  registered  as a bank  holding  company with the Board of
Governors of the Federal Reserve System (the "Federal  Reserve Board") under the
BHCA. True and complete copies of the Articles of  Incorporation  and By-Laws of
Seller and the Articles of  Association  and By-Laws of First National Bank Iowa
("FNBI"),  a national  banking  association  and a wholly  owned  Subsidiary  of
Seller, each as in effect on the date of this Agreement,  are attached hereto as
Schedule 2.01. 

     2.02 Subsidiaries.
          -------------

          (a)  Schedule  2.02 sets forth a complete  and correct  list of all of
     Seller's  "Subsidiaries"  (as  defined  in  Rule  1-02  of  Regulation  S-X
     promulgated by the Securities and Exchange  Commission (the "SEC");  each a
     "Seller Subsidiary" and, collectively, the "Seller Subsidiaries"),  and all
     outstanding  Equity  Securities (as defined in Section 2.03) of each Seller
     Subsidiary, all of which are owned directly or indirectly by Seller. Except
     as disclosed in Schedule  2.02,  all of the  outstanding  shares of capital
     stock of the Seller Subsidiaries owned directly or indirectly by Seller are
     validly issued,  fully paid and  nonassessable and are owned free and clear
     of any lien,  claim,  charge,  option,  encumbrance,  agreement,  mortgage,
     pledge,  security  interest or restriction (a "Lien") with respect thereto.
     Each of the Seller Subsidiaries is a corporation, bank or savings bank duly
     incorporated  or  organized  and  validly  existing  under  the laws of its
     jurisdiction of incorporation or organization,  and has corporate power and
     authority  to own or lease its  properties  and  assets and to carry on its
     business as it is now being conducted.  Each of the Seller  Subsidiaries is
     duly qualified to do business in each  jurisdiction  where its ownership or
     leasing of  property or the  conduct of its  business  requires it so to be
     qualified, except where the failure to so qualify would not have a Material
     Adverse  Effect on Seller  and the Seller  Subsidiaries,  taken as a whole.
     Except  as set  forth in  Schedule  2.02,  neither  Seller  nor any  Seller
     Subsidiary  owns  beneficially,  directly or indirectly,  any shares of any
     class of  Equity  Securities  (as  defined  in  Section  2.03)  or  similar
     interests  of  any  corporation,   bank,  business  trust,  association  or
     organization,  or any  interest in a  partnership  or joint  venture of any
     kind, other than those  identified as Seller  Subsidiaries in Schedule 2.02
     hereof.

          (b) FNBI is a national banking  association duly organized and validly
     existing under the laws of the United States of America.

     2.03  Capitalization.  The authorized  capital stock of Seller consists of:
(i) 15,000,000  shares of Seller Common Stock,  of which,  as of March 31, 1998,
3,553,717 shares were issued and outstanding.  As of March 31, 1998,  Seller had
reserved 297,738 shares of Seller Common Stock for issuance under Seller's stock
option and incentive plans (including grants reflected in the Board minutes),  a
list of which is set forth on Schedule 2.03 (the "Seller Stock Plans"), pursuant
to which options  ("Seller  Employee Stock  Options")  covering 76,788 shares of
Seller Common Stock were outstanding as of March 31, 1998. Since March 31, 1998,
no Equity  Securities  of Seller have been  issued,  other than shares of Seller
Common  Stock  which may have been  issued  upon the  exercise  of Seller  Stock

                                       17
<PAGE>
Options.  "Equity  Securities"  of an issuer means capital stock or other equity
securities of such issuer,  options,  warrants,  scrip,  rights to subscribe to,
calls or commitments of any character  whatsoever  relating to, or securities or
rights  convertible into, shares of any capital stock or other equity securities
of such issuer,  or contracts,  commitments,  understandings  or arrangements by
which  such  issuer is or may  become  bound to issue  additional  shares of its
capital stock or other equity securities of such issuer,  or options,  warrants,
scrip or rights to purchase,  acquire, subscribe to, calls on or commitments for
any shares of its capital stock or other equity securities.  Except as set forth
above,  there are no other Equity Securities of Seller  outstanding.  All of the
issued and outstanding  shares of Seller Common Stock are validly issued,  fully
paid and nonassessable,  and have not been issued in violation of any preemptive
right of any shareholder of Seller. Neither Seller nor any Seller Subsidiary has
taken  or  agreed  to take  any  action  or has  any  knowledge  of any  fact or
circumstance  and neither Seller nor any Seller  Subsidiary will take any action
that would  prevent  the Merger  from  qualifying  for  pooling-of-interests  ac
counting treatment. 

     2.04 Authorization.
          -------------

          (a) Seller has the  corporate  power and  authority to enter into this
     Agreement   and,   subject  to  the  approval  of  this  Agreement  by  the
     shareholders  of Seller  and the  Regulatory  Authorities  (as  defined  in
     Section 2.06), to carry out its obligations hereunder. The only shareholder
     vote required for Seller to approve this Agreement is the affirmative  vote
     of the holders of at least two thirds of the  outstanding  shares of Seller
     Common Stock  entitled to vote at a meeting  called for such  purpose.  The
     execution,  delivery and  performance  of this  Agreement by Seller and the
     consummation  by  Seller  of  the  transactions   contemplated   hereby  in
     accordance  with and subject to the terms of this  Agreement have been duly
     authorized by the Board of Directors of Seller.  Subject to the approval of
     Seller's  shareholders  and subject to the receipt of such approvals of the
     Regulatory  Authorities as may be required by statute or  regulation,  this
     Agreement is a valid and binding obligation of Sell er enforceable  against
     Seller in accordance with its terms.

          (b) Except as disclosed on Schedule 2.04(b), neither the execution nor
     delivery nor performance by Seller of this Agreement,  nor the consummation
     by Seller of the transactions contemplated hereby, nor compliance by Seller
     with any of the  provisions  hereof,  will (i) violate,  conflict  with, or
     result in a breach of any  provisions  of, or  constitute  a default (or an
     event  which,  with  notice or lapse of time or both,  would  constitute  a
     default)  under,  or  result  in the  termination  of,  or  accelerate  the
     performance   required  by,  or  result  in  a  right  of   termination  or
     acceleration  of, or result in the  creation  of,  any Lien upon any of the
     properties or assets of Seller or any of the Seller  Subsidiaries under any
     of the terms,  conditions or provisions of (x) its  Certificate or Articles
     of  Incorporation,  charter  or By-Laws  or (y) any note,  bond,  mortgage,
     indenture,  deed of trust, license, lease, agreement or other instrument or
     obligation to which Seller o any of the Seller  Subsidiaries  is a party or
     by  which  it  may be  bound,  or to  which  Seller  or  any of the  Seller
     Subsidiaries  or any of the  properties  or  assets of Seller or any of the
     Seller  Subsidiaries may be subject,  other than those as to which any such
     violation,  conflict, breach, event, termination,  acceleration or creation
     would  not  have a  Material  Adverse  Effect  on  Seller  and  the  Seller
     Subsidiaries,  taken as a whole,  or (ii)  subject to  compliance  with the
     statutes  and  regulations  referred to in  subsection  (c) of this Section
     2.04,  violate any  judgment,  ruling,  order,  writ,  injunction,  decree,
     statute,  rule or  regulation  applicable  to Seller  or any of the  Seller
     Subsidiaries or any of their respective properties or assets.

                                       18
<PAGE>

          (c) Other than in connection or in compliance  with the  provisions of
     the Missouri Statute, the IBCA, the Securities Act of 1933, as amended, and
     the rules and regulations thereunder (collectively,  the "Securities Act"),
     the  Securities  Exchange  Act of  1934,  as  amended,  and the  rules  and
     regulations  thereunder  (the "Exchange  Act"),  the securities or blue sky
     laws of the various states or filings, consents,  reviews,  authorizations,
     approvals or exemptions  required unde the BHCA, or any required  approvals
     of the Federal Reserve Board,  the FDIC or other  governmental  agencies or
     governing  boards  having  regulatory  authority  over Seller or any Seller
     Subsidiary,  no  notice  to,  filing  with,  exemption  or  review  by,  or
     authorization,  consent or  approval  of, any public body or  authority  is
     necessary for the consummation by Seller of the  transactions  contemplated
     by this Agreement. 

     2.05 Seller Financial Statements.
          ----------------------------

          (a)  Attached  hereto as Schedule  2.05(a) are copies of the  Seller's
     Annual  Report to  Shareholders  for the year ended  December  31,  1997.

          (b) The financial  statements contained in the documents referenced in
     Schedule  2.05(a) are  referred to  collectively  as the "Seller  Financial
     Statements."  The  Seller  Financial   Statements  have  been  prepared  in
     accordance with generally accepted  accounting  principles  ("GAAP") during
     the  periods  involved,  and  present  fairly  the  consolidated  financial
     position of Seller and the Seller Subsidiaries at the dates thereof and the
     consolidated  results of operations,  changes r in shareholders' equity and
     cash flows, as applicable,  of Seller and the Seller  Subsidiaries  for the
     periods stated therein.

          (c) Seller and the Seller  Subsidiaries  have each prepared,  kept and
     maintained  through the date hereof true,  correct and  complete  financial
     books and records  which  fairly  reflect in all  material  respects  their
     respective  financial  conditions,   results  of  operations,   changes  in
     shareholders' equity and cash flows.

     2.06 Seller  Reports.  Since January 1, 1995, each of Seller and the Seller
Subsidiaries has timely filed any and all material  reports,  registrations  and
statements,  together with any required amendments thereto, that it was required
to file with (i) the SEC, including, but not limited to, Forms 10-K, Forms 10-Q,
Forms 8-K and proxy statements,  (ii) the Federal Reserve Board,  (iii) the FDIC
and (iv) any federal, state, municipal or local government, securities, banking,
savings and loan, environmental,  insurance and other governmental or regulatory
authority,  and the agencies and staffs  thereof (the  entities in the foregoing
clauses  (i)  through  (iv)  being  referred  to  herein   collectively  as  the
"Regulatory Authorities" and individually as a "Regulatory  Authority"),  having
jurisdiction  over the affairs of it. All such material  reports and  statements
filed with any such Regulatory Authority are collectively  referred to herein as
the "Seller  Reports." As of each of their respective  dates, the Seller Reports
complied in all material respects with all the rules and regulations promulgated
by the  applicable  Regulatory  Authority.  With respect to Seller Reports filed
with the  Regulatory  Authorities,  there is no material  unresolved  violation,
criticism or exception by any Regulatory Authority with respect to any report or
statement  filed  by,  or any  examinations  of,  Seller  or  any of the  Seller
Subsidiaries. 

                                       19
<PAGE>

     2.07 Title to and Condition of Assets. 
          --------------------------------

          (a) Except as may be reflected in the Seller Financial  Statements and
     with the exception of all "Real Property"  (which is the subject of Section
     2.08 hereof),  Seller and the Seller  Subsidiaries have, and at the Closing
     Date will have,  good and  marketable  title to their owned  properties and
     assets,  including,  without  limitation,  those  reflected  in the  Seller
     Financial  Statements  (except those disposed of in the ordinary  course of
     business  since the date  thereof),  fre and clear of any Lien,  except for
     Liens for (i) taxes,  assessments  or other  governmental  charges  not yet
     delinquent,  (ii)  as  set  forth  or  described  in the  Seller  Financial
     Statements  or any  subsequent  Seller  Financial  Statements  delivered to
     Buyers prior to the Effective  Time,  and (iii) pledges to secure  deposits
     and other Liens incurred in the ordinary course of business. 

          (b) No material  properties  or assets that are  reflected as owned by
     Seller or any of the Seller Subsidiaries in the Seller Financial Statements
     as of December 31, 1997, have been sold, leased,  transferred,  assigned or
     otherwise  disposed of since such date,  except in the  ordinary  course of
     business.

          (c) All  furniture,  fixtures,  vehicles,  machinery and equipment and
     computer  software  owned or used by  Seller  or the  Seller  Subsidiaries,
     including any such items leased as a lessee (taken as a whole as to each of
     the foregoing with no single item deemed to be of material  importance) are
     in good  working  order and free of known  defects,  subject only to normal
     wear and tear. The operation by Seller or the Seller  Subsidiaries  of such
     properties and assets is in compliance in all material  respects with all
     applicable  laws,  ordinances and rules and regulations of any governmental
     authority having jurisdiction over such use.

          2.08 Real Property. 
               -------------

               (a) A list of each parcel of real property owned by Seller or any
          of the Seller  Subsidiaries  (other  than real  property  acquired  in
          foreclosure  or in lieu of foreclosure in the course of the collection
          of  loans  and  being  held  by  Seller  or a  Seller  Subsidiary  for
          disposition as required by law) is set forth in Schedule 2.08(a) under
          the heading  "Owned Real  Property"  (such real property  being herein
          referred  to as the "Owned Real  Property").  A list of each parcel of
          real property  leased by Seller or any of the Seller  Subsidiaries  is
          also set forth in  Schedule  2.08(a)  under the heading  "Leased  Real
          Property"  (such real property being herein referred to as the "Leased
          Real Property").  Seller shall update Schedule 2.08(a) within ten (10)
          days of acquiring  any Owned Real  Property or leasing any Leased Real
          Property after the date hereof. Collectively,  the Owned Real Property
          and the  Leased  Real  Property  are herein  referred  to as the "Real
          Property." 

               (b) There is no  pending  action  involving  Seller or any of the
          Seller  Subsidiaries as to the title of or the right to use any of the
          Real Property. 

               (c) Except as disclosed on Schedule  2.08(c),  neither Seller nor
          any of the Seller  Subsidiaries  has any interest in any real property
          other than as described above in Section 2.08(a) except interests as a
          mortgagee,  any real property  acquired in  foreclosure  or in lieu of
          foreclosure  and being held for  disposition  as  required  by law and
          property held by any Seller  Subsidiary in its fiduciary  capacity.  

                                       20
<PAGE>
               (d) To the  best  knowledge  of  Seller,  none of the  buildings,
          structures  or  other  improvements   located  on  the  Real  Property
          encroaches  upon or over any  adjoining  parcel of real  estate or any
          easement or  right-of-way  or "setback"  line and all such  buildings,
          structures and  improvements are located and constructed in conformity
          with all applicable zoning ordinances and building codes.

               (e) None of the buildings,  structures or improvements located on
          the Owned Real  Property are the subject of any official  complaint or
          notice by any  governmental  authority of violation of any  applicable
          zoning  ordinance or building code, and there is no zoning  ordinance,
          building code, use or occupancy  restriction or condemnation action or
          proceeding pending,  or, to the best knowledge of Seller,  threatened,
          with respect to any such building, structure or improvement. The Owned
          Real Property is in generally good condition for its intended purpose,
          ordinary wear and tear excepted, and has been maintained in accordance
          with  reasonable  and prudent  business  practices  applicable to like
          facilities.

               (f) Except as may be reflected in the Seller Financial Statements
          or with respect to such easements,  Liens,  defects or encumbrances as
          do not  individually or in the aggregate  materially  adversely affect
          the use or value of the parcel of Owned Real Property,  Seller and the
          Seller  Subsidiaries have, and at the Closing Date will have, good and
          marketable title to their respective Owned Real Properties.

               (g) Neither Seller nor any of the Seller  Subsidiaries has caused
          or allowed the generation,  treatment, storage, disposal or release at
          any Real Property of any Toxic Substance,  except in accordance in all
          material  respects with all applicable  federal,  state and local laws
          and  regulations.  "Toxic  Substance"  means any  hazardous,  toxic or
          dangerous  substance,  pollutant,  waste, gas or material,  including,
          without limitation,  petroleum and petroleum products, metals liquids,
          semi-solids or solids, that are regulated under any federal,  state or
          local statute,  ordinance, rule, regulation or other law pertaining to
          environmental protection,  contamination, quality, waste management or
          cleanup.  There are no  underground  storage  tanks  located on, in or
          under any Owned Real Property or Leased Real Property.

     2.09 Taxes.  Seller and each Seller  Subsidiary  have timely  filed or will
timely file (including extensions) all material tax returns required to be filed
at or prior to the  Closing  Date  ("Seller  Returns").  Each of Seller  and the
Seller  Subsidiaries  has  paid,  or  set up  adequate  reserves  on the  Seller
Financial  Statements  for the  payment  of,  all taxes  required  to be paid in
respect of the periods  covered by such  Seller  Returns and has set up adequate
reserves on the most recent Seller  Financial  Statements for the payment of all
taxes  anticipated  to be payable in respect of all periods up to and  including
the latest period covered by such Seller  Financial  Statements.  Neither Seller
nor any  Seller  Subsidiary  has any  material  liability  for any such taxes in
excess of the  amounts  so paid or  reserves  so  established,  and no  material
deficiencies for any tax,  assessment or governmental charge have been proposed,
asserted or assessed in writing  (tentatively  or definitely)  against Seller or
any of the  Seller  Subsidiaries  which  have not been  settled  or would not be
covered by existing reserves.  Neither Seller nor any of the Seller Subsidiaries
is  delinquent in the payment of any material  tax,  assessment or  governmental
charge,  nor has it requested any extension of time within which to file any tax
returns in  respect  of any  fiscal  year which have not since been filed and no
requests  for waivers of the time to assess any tax are  pending.  Except as set
forth on Schedule  2.09,  no federal or state income tax return of Seller or any
Seller Subsidiaries has been audited by the Internal Revenue Service (the "IRS")
or any state tax authority for the seven most recent full calendar years. Except
as set forth on Schedule 2.09,  there is no deficiency or refund  litigation or,
to the best knowledge of Seller,  matter in  controversy  with respect to Seller
Returns.  Except as set forth on Schedule 2.09 hereof, neither Seller nor any of
the Seller Subsidiaries has extended or waived any statute of limitations on the
assessment of any ta x due that is currently in effect. 

                                       21
<PAGE>

     2.10 Material  Adverse Effect.  Since December 31, 1997,  there has been no
Material Adverse Effect on Seller and the Seller Subsidiaries, taken as a whole.

     2.11 Loans, Commitments and Contracts. 
          --------------------------------

          (a) Schedule 2.11(a) contains a complete and accurate  listing,  as of
     December 31, 1997, of all  contracts  entered into with respect to deposits
     and  repurchase  agreements of  $1,000,000 or more, by account,  and, as of
     December  31,  1997,  all  loan  agreements,  notes,  security  agreements,
     bankers'   acceptances,   outstanding  letters  of  credit,   participation
     agreements,  and other  documents  relating to or involving  extensions  of
     credit by Seller or any of the Seller  Subsidiarie  and, as of December 31,
     1997, all loan  commitments  and commitments to issue letters of credit and
     other  commitments  to extend  credit  with  respect  to any one  entity or
     related group of entities in excess of $1,000,000 to which Seller or any of
     the Seller Subsidiaries is a party or by which it is bound, by account. 

          (b) Except for the contracts and  agreements  required to be listed on
     Schedule  2.11(a) and the loans required to be listed on Schedule  2.11(f),
     and except as  otherwise  listed on Schedule  2.11(b),  as of December  31,
     1997, neither Seller nor any of the Seller Subsidiaries is a party to or is
     bound by any:

               (i) agreement, contract, arrangement, understanding or commitment
          with any labor union;

               (ii) material franchise or license agreement,  excluding software
          license agreements entered into in the ordinary course of business; s

               (iii) written  employment,  severance,  termination  pay, agency,
          consulting  or similar  agreement or commitment in respect of personal
          services; 

               (iv) material  agreement,  arrangement or commitment (A) not made
          in the ordinary  course of business,  and (B) pursuant to which Seller
          or any of the Seller Subsidiaries is or may become obligated to invest
          in or  contribute  to any Seller  Subsidiary  other than  pursuant  to
          Seller Employee Plans (as that term is defined in Section 2.19 hereof)
          or agreements  relating to joint ventures or partnerships set forth in
          Schedule 2.02,  true and complete  copies of which have been furnished
          to Buyers;

               (v) agreement, indenture or other instrument not disclosed in the
          Seller  Financial  Statements  relating to the  borrowing  of money by
          Seller or any of the Seller Subsidiaries or the guarantee by Seller or
          any of the Seller  Subsidiaries  of any such  obligation  (other  than
          trade payables or instruments related to transactions  entered into in
          the  ordinary  course  of  business  by  Seller  or any of the  Seller
          Subsidiaries,  such as deposits,  Federal Home Loan Bank  ("FHLB") and
          Federal  Funds  borrowings  and  repurchase  and  reverse   repurchase
          agreements),  other than such  agreements,  indentures or  instruments
          providing for annual payments of less than $200,000; 

               (vi)  contract  containing  covenants  which limit the ability of
          Seller or any of the  Seller  Subsidiaries  to  compete in any line of
          business or with any person or which involves any  restrictions on the
          geographical  area in which, or method by which,  Seller or any of the
          Seller  Subsidiaries may carry on their respective  businesses  (other
          that  as  may  be  required  by  law  or  any  applicable   Regulatory
          Authority); 

               (vii) contract or agreement which is a "material contract" within
          the meaning of Item 601(b)(10) of Regulation S-K as promulgated by the
          SEC to be performed after the date of this Agreement that has not been
          filed or incorporated by reference in the Seller Reports; 

                                       22
<PAGE>
               (viii) lease with annual rental payments  aggregating $100,000 or
          more;

               (ix) loans or other obligations  payable or owing to any officer,
          director or employee except (A) salaries, wages and directors' fees or
          other  compensation  incurred  and accrued in the  ordinary  course of
          business and (B) obligations due in respect of any depository accounts
          maintained  by any of the  foregoing  with Seller or any of the Seller
          Subsidiaries in the ordinary course of business; or 

               (x) other  agreement,  contract,  arrangement,  understanding  or
          commitment  involving  an  obligation  by Seller or any of the  Seller
          Subsidiaries  of more than  $250,000 and  extending  beyond six months
          from the date hereof that cannot be canceled  without  cost or penalty
          upon notice of 30 days or less,  other than contracts  entered into in
          respect of deposits, loan agreements and commitments,  notes, security
          agreements,  repurchase and reverse  repurchase  agreements,  bankers'
          acceptances,  outstanding  letters of credit and  commitments to issue
          letters  of  credit,  participation  agreements  and  other  documents
          relating to  transactions  entered into by Seller or any of the Seller
          Subsidiaries  in the  ordinary  course of business  and not  involving
          extensions  of credit with respect to any one entity or related  group
          of entities in excess of $1,000,000.

          (c) Seller and/or the Seller  Subsidiaries carry property,  liability,
     director and officer  errors and  omissions,  products  liability and other
     insurance  coverage  as set forth in  Schedule  2.11(c)  under the  heading
     "Insurance."

          (d) True,  correct and complete copies of the  agreements,  contracts,
     leases  and  other  documents  referred  to in  Section  2.11(b)  have been
     included with Schedule 2.11(b) hereto. True, correct and complete copies of
     the agreements,  contracts,  leases, insurance policies and other documents
     referred to in Schedules 2.11(a) and (c) have been or shall be furnished or
     made available to Buyers.

          (e)  To  the  best  knowledge  of  Seller,  each  of  the  agreements,
     contracts,  leases,  insurance  policies and other documents referred to in
     Schedules  2.11  (a),  (b)  and (c) is a  valid,  binding  and  enforceable
     obligation  of the  parties  sought  to be  bound  thereby,  except  as the
     enforceability  thereof  against the parties  thereto (other than Seller or
     any of the Seller  Subsidiaries) may be limited by bankruptcy,  insolvency,
     reorganization,  moratorium  and  other  laws now or  hereafter  in  effect
     relating to the enforcement of creditors' rights generally, and except that
     equitable  principles may limit the right to obtain specific performance or
     other equitable remedies.

          (f)  Schedule  2.11(f)  under the  heading  "Loans"  contains  a true,
     correct and complete listing,  as of December 31, 1997, by account,  of (i)
     all loans in excess of $500,000 of Seller or any of the Seller Subsidiaries
     that have been  accelerated  during the past twelve  months;  (ii) all loan
     commitments or lines of credit of Seller or any of the Seller  Subsidiaries
     in excess of $500,000  which have been  terminated  by Seller or any of the
     Seller  Subsidiaries  during the past twelve months by reason of default or
     adverse  developments  in the  condition of the borrower or other events or
     circumstances affecting the credit of the borrower;  (iii) all loans, lines
     of credit and loan commitments in excess of $500,000, as to which Seller or
     any of the Seller  Subsidiaries  has given written  notice of its intent to
     terminate during the past twelve months;  (iv) with respect to all loans in
     excess  of   $500,000   all   notification   letters   and  other   written
     communications  from  Seller or any of the  Seller  Subsidiaries  to any of
     their  respective  borrowers,  customers or other  parties  during the past
     twelve  months  wherein  Seller  or  any  of the  Seller  Subsidiaries  has
     requested or demanded that actions be taken to correct existing defaults or
     facts or  circumstances  which  may  become  defaults;  (v) each  borrower,
     customer  or other  party  which has  notified  Seller or any of the Seller
     Subsidiaries  during the past  twelve  months of, or has  asserted  against

                                       23
<PAGE>

     Seller or any of the  Seller  Subsidiaries,  in each case in  writing,  any
     "lender  liability" or similar claim, and, to the best knowledge of Seller,
     each borrower, customer or other party which has given Seller or any of the
     Seller  Subsidiaries  any oral  notification  of, or orally  asserted to or
     against Seller or any of the Seller  Subsidiaries,  any such claim; or (vi)
     all loans in excess of $250,000 (A) that are contractually past due 90 days
     or more in the  payment  of  principal  and/or  interest,  (B)  that are on
     non-accrual status, (C) that have been classified "doubtful," "loss" or the
     equivalent  thereof by any  Regulatory  Authority,  (D) where a  reasonable
     doubt exists as to the timely  future  collectibility  of principal  and/or
     interest,  whether or not  interest  is still  accruing or the loan is less
     than 90 days past due, (E) the interest rate terms have been reduced and/or
     the maturity  dates have been extended  subsequent  to the agreement  under
     which  the  loan was  originally  created  due to  concerns  regarding  the
     borrower's  ability to pay in accordance  with such initial  terms,  or (F)
     where a specific reserve allocation exists in connection therewith.

     2.12 Absence of Defaults. Neither Seller nor any of the Seller Subsidiaries
is in  violation  of its charter  documents  or By-Laws or in default  under any
material agreement,  commitment,  arrangement,  lease, insurance policy or other
instrument, whether entered into in the ordinary course of business or otherwise
and whether written or oral, and there has not occurred any event that, with the
lapse of time or  giving of notice or both,  would  constitute  such a  default,
except in all cases where such default would no t have a Material Adverse Effect
on Seller and its Subsidiaries, taken as a whole.

     2.13 Litigation and Other Proceedings. Except as set forth on Schedule 2.13
or otherwise  disclosed in the Seller Financial  Statements,  neither Seller nor
any of the  Seller  Subsidiaries  is a party  to any  pending  or,  to the  best
knowledge  of  Seller,   threatened  claim,  action,   suit,   investigation  or
proceeding,  or is subject to any order,  judgment or decree, except for matters
which, in the aggregate,  will not have, or reasonably  could not be expected to
have, a Material Adverse Effect on Seller and the Seller Subsidiaries,  taken as
a whole. Without limiting the generality of the foregoing, there are no actions,
suits or  proceedings  pending or, to the best  knowledge of Seller,  threatened
against  Seller or any of the  Seller  Subsidiaries  or any of their  respective
officers  or  directors  by any  shareholder  of  Seller  or  any of the  Seller
Subsidiaries  (or  any  former  shareholder  of  Seller  or any  of  the  Seller
Subsidiaries) or involving claims under the Community  Reinvestment Act of 1977,
as amended,  the Bank Secrecy A ct, the fair  lending laws or any other  similar
laws.

     2.14  Directors'  and  Officers'  Insurance.  Each of Seller and the Seller
Subsidiaries  has taken or will take all requisite  action  (including,  without
limitation,  the  making of claims and the giving of  notices)  pursuant  to its
directors'  and  officers'  liability  insurance  policy or policies in order to
preserve all rights  thereunder  with respect to all matters (other than matters
arising in  connection  with this  Agreement and the  transactions  contemplated
hereby) occurring prior to the Effective Time that are kno wn to Seller.

     2.15 Compliance with Laws

          (a) To the best  knowledge  of  Seller,  Seller and each of the Seller
     Subsidiaries  have  all  permits,  licenses,  authorizations,   orders  and
     approvals  of, and have made all filings,  applications  and  registrations
     with, all Regulatory  Authorities that are required in order to permit them
     to own or lease  their  respective  properties  and  assets and to carry on
     their  respective  businesses  as presently  conducted;  all such  permits,
     licenses, certificates of authority, orders and approvals are in full force
     and  effect  and,  to the  best  knowledge  of  Seller,  no  suspension  or
     cancellation  of  any  of  them  is  threatened;   and  all  such  filings,
     applications  and  registrations  are  current;  in each  case  except  for
     permits, licenses, authorizations, orders, approvals, filings, applications
     and  registrations  the  failure  to have (or have  made)  would not have a
     Material Adverse Effect on Seller and the Seller  Subsidiaries,  taken as a
     whole.

                                       24
<PAGE>
          (b) (i) Each of Seller and the Seller  Subsidiaries  has complied with
     all laws,  regulations and orders (including,  without  limitation,  zoning
     ordinances,  building codes, the Employee Retirement Income Security Act of
     1974, as amended  ("ERISA"),  and  securities,  tax,  environmental,  civil
     rights, and occupational health and safety laws and regulations  including,
     without limitation,  in the case of Seller or any Seller Subsidiary that is
     a bank or savings association, banking organization, banking corporation or
     trust  company,  all statutes,  rules,  regulations  and policy  statements
     pertaining to the conduct of a banking, deposit-taking,  lending or related
     business,  or to the exercise of trust  powers) and  governing  instruments
     applicable  to it and to the  conduct  of its  business,  and (ii)  neither
     Seller nor any of the Seller Subsidiaries is in default under, and no event
     has occurred which,  with the lapse of time or notice or both, could result
     in the default  under,  the terms of any  judgment,  order,  writ,  decree,
     permit, or license of any Regulatory  Authority or court,  whether federal,
     state,  municipal or local, and whether at law or in equity,  except in the
     case of subparts (i) and (ii) where such failure to comply or default would
     not have a Material  Adverse Effect on Seller and the Seller  Subsidiaries,
     taken as a whole.

          (c) Except as set forth on Schedule 2.15(c), neither Seller nor any of
     the  Seller  Subsidiaries  is subject  to or  reasonably  likely to incur a
     liability as a result of its ownership,  operation,  or use of any Property
     (as defined below) of Seller (whether directly or, to the best knowledge of
     Seller,  as a consequence of such Property being acquired in foreclosure or
     in lieu of foreclosure or being part of the investment  portfolio of Seller
     or any of the Seller  Subsidiaries) (A) that is contaminated by or contains
     any Toxic  Substance  (as  defined in  Section  2.08),  including,  without
     limitation,  petroleum and petroleum products,  asbestos, PCBs, pesticides,
     herbicides  and any other  substance  or waste that is  hazardous  to human
     health or the environment and regulated by federal,  state or local law, or
     (B) on which any Toxic  Substance  has been stored,  disposed of, placed or
     used at the Property or in the  construction  of  structures  thereon;  and
     which in each case, reasonably could be expected to have a Material Adverse
     Effect on Seller and the Seller Subsidiaries,  taken as a whole. "Property"
     shall include all property (real or personal, tangible or intangible) owned
     or  controlled  by Seller  or any of the  Seller  Subsidiaries,  including,
     without  limitation,  property  acquired  under  foreclosure  or in lieu of
     foreclosure,  property  in which any  venture  capital or  similar  unit of
     Seller or any of the Seller  Subsidiaries  has an interest and, to the best
     knowledge  of  Seller,  property  held  by  Seller  or any  of  the  Seller
     Subsidiaries  in its  capacity  as a  trustee.  No claim,  action,  suit or
     proceeding is pending or, to the best knowledge of Seller,  threatened, and
     no material  claim has been  asserted  against  Seller or any of the Seller
     Subsidiaries   relating  to  Property  of  Seller  or  any  of  the  Seller
     Subsidiaries before any court or other Regulatory  Authority or arbitration
     tribunal  relating to Toxic Substances,  pollution or the environment,  and
     there is no outstanding judgment, order, writ, injunction,  decree or award
     against or affecting Seller or any of the Seller  Subsidiaries with respect
     to the same.

          (d) Neither Seller nor any of the Seller Subsidiaries has received any
     notification or  communication  that has not been finally resolved from any
     Regulatory  Authority  (i)  asserting  that the Seller or any of the Seller
     Subsidiaries  or any Property is not in substantial  compliance with any of
     the statutes,  regulations  or ordinances  that such  Regulatory  Authority
     enforces,  except with  respect to matters  which  reasonably  could not be
     expected  to have a  Material  Adverse  Effect on the Seller and the Seller
     Subsidiaries,  taken as a whole,  (ii)  threatening  to revoke any license,
     franchise,  permit or governmental  authorization  that reasonably could be
     expected  to have a  Material  Adverse  Effect on the Seller and the Seller
     Subsidiaries,  taken  as  a  whole,  including,  without  limitation,  such
     company's status as an insured depository institution under the FDI Act, or
     (iii)  requiring  or  threatening  to  require  Seller or any of the Seller
     Subsidiaries,  or indicating that Seller or any of the Seller  Subsidiaries
     may be  required,  to enter into a cease and  desist  order,  agreement  or

                                       25
<PAGE>
     memorandum of understanding or any other agreement  restricting or limiting
     or purporting to direct,  restrict or limit in any manner the operations of
     Seller or any of the Seller  Subsidiaries,  including,  without limitation,
     any  restriction  on the  payment  of  dividends.  No such cease and desist
     order,  agreement or  memorandum  of  understanding  or other  agreement is
     currently in effect.

          (e) Neither Seller nor any of the Seller  Subsidiaries  is required by
     Section  32 of the FDI Act to give  prior  notice  to any  federal  banking
     agency of the proposed  addition of an individual to its board of directors
     or the employment of an individual as a senior executive officer.

     2.16  Labor.  No  work  stoppage  involving  Seller  or any  of the  Seller
Subsidiaries is pending or, to the best knowledge of Seller, threatened.  Except
as set forth on Schedule 2.13, neither Seller nor any of the Seller Subsidiaries
is involved in, or, to the best knowledge of Seller, threatened with or affected
by, any labor dispute,  arbitration,  lawsuit or administrative  proceeding that
reasonably could be expected to have a Material Adverse Effect on the Seller and
the Seller  Subsidiaries,  taken as a whole.  None of the employees of Seller or
the Seller  Subsidiaries  are  represented  by any labor union or any collective
bargaining organization. 

     2.17 Material Interests of Certain Persons. Except as set forth in Seller's
proxy  statement  for its 1998  Annual  Meeting of  Shareholders,  no officer or
director of Seller or any of the Seller  Subsidiaries,  or any  "associate"  (as
such term is defined in Rule 14a-1 under the  Exchange  Act) of any such officer
or director,  has any  interest in any  contract or property  (real or personal,
tangible or  intangible),  used in, or  pertaining to the business of, Seller or
any of the  Seller  Subsidiaries,  which in the case of  Seller  and each of the
Seller  Subsidiaries would be required to be disclosed by Item 404 of Regulation
S-K promulgated by the SEC.

     2.18 Allowance for Loan and Lease Losses;  Non-Performing Assets; Financial
Assets.

          (a)  All of  the  accounts,  notes  and  other  receivables  that  are
     reflected in the Seller  Financial  Statements as of December 31, 1997 were
     acquired in the ordinary course of business and were collectible in full in
     the ordinary course of business,  except for possible loan and lease losses
     that are adequately provided for in the allowance for loan and lease losses
     reflected  in  such  Seller  Financial   Statements,   and  the  collection
     experience of Seller and the Seller Subsidiaries since December 31, 1997 to
     the date hereof,  has not deviated in any material and adverse  manner from
     the credit and collection experience of Seller and the Seller Subsidiaries,
     taken as a whole, for the six months ended December 31, 1997.

          (b) The allowances for loan losses  contained in the Seller  Financial
     Statements  were  established  in  accordance  with the past  practices and
     experiences  of Seller and the Seller  Subsidiaries,  and the allowance for
     loan and lease losses shown on the consolidated balance sheet of Seller and
     the Seller  Subsidiaries  as of December  31,  1997,  were  adequate in all
     material respects under the requirements of GAAP, or regulatory  accounting
     principles, as the case may be, to provide for possible losses on loans and
     leases (including,  without  limitation,  accrued interest  receivable) and
     credit  commitments  (including,  without  limitation,  stand-by letters of
     credit) as of the date of such balance sheet.

          (c) Schedule  2.18(c) sets forth as of the date of this  Agreement all
     assets classified by Seller as real estate acquired through  foreclosure or
     repossession, including foreclosed assets.

          (d)  As  of  December  31,   1997,   the   aggregate   amount  of  all
     Non-Performing  Assets  (as  defined  below) on the books of Seller and the
     Seller  Subsidiaries  did not exceed  $3,266,356.  "Non-Performing  Assets"
     shall  mean (i) all  loans (A) that are  contractually  past due 90 days or
     more  in  the  payment  of  principal  and/or  interest,  (B)  that  are on
     nonaccrual status, (C) that have been classified  "doubtful," "loss" or the
     equivalent  thereof by any Regulatory Agency or (D) where the interest rate
     terms have been  reduced  and/or  the  maturity  dates  have been  extended
     subsequent to the agreement under which the loan was originally created due
     to concerns regarding the borrower's ability to pay in accordance with such
     initial  terms,  and (ii) all assets  classified  by Seller as real  estate

                                       26
<PAGE>
     acquired  through   foreclosure  or  in  lieu  of  foreclosure,   including
     in-substance   foreclosures,   and  all  other  assets   acquired   through
     foreclosure or in lieu of foreclosure.

          (e) All loans  receivable  (including  discounts) and accrued interest
     entered on the books of Seller and the Seller  Subsidiaries,  to the extent
     unpaid  on  the  Closing  Date,   arose  out  of  bona  fide   arm's-length
     transactions, were made for good and valuable consideration in the ordinary
     course  of  Seller's  or the  appropriate  Seller  Subsidiary's  respective
     business,  and the notes or other evidences of indebtedness with respect to
     such loans or  discounts  are true and genuine and are what they purport to
     be. The loans, discounts and the accrued interest reflected on the books of
     Seller and the Seller Subsidiaries are subject to no defenses,  set-offs or
     counterclaims  (including,  without limitation,  those afforded by usury or
     truth-in-lending laws), except as may be provided by bankruptcy, insolvency
     or  similar  laws  affecting  creditors'  rights  generally  or by  general
     principles of equity. All such loans are owned by Seller or the appropriate
     Seller   Subsidiary  free  and  clear  of  any  lien  s,   restrictions  or
     encumbrances. 

          (f) The notes and other evidences of indebtedness evidencing the loans
     described in Section 2.18(e) above,  and all pledges,  mortgages,  deeds of
     trust and other  collateral  documents  or  security  instruments  relating
     thereto are and will be, in all material respects, valid, true, genuine and
     enforceable,  and what they  purport  to be.  Seller and each of the Seller
     Subsidiaries has good and valid title to the investment securities shown on
     the Seller Financial  Statements and all securities entered on the books of
     Seller or the  appropriate  Seller  Subsidiary  subsequent  to December 31,
     1997, except for those sold or redeemed in the ordinary course of business.
     A complete and accurate list of such  investment  securities as of December
     31, 1997 is attached as Schedule  2.18(f).  Such list shall be updated each
     month in writing until the Closing.

     2.19 Employee Benefit Plans.
          ----------------------

          (a)  Schedule  2.19(a)  lists all  pension,  retirement,  supplemental
     retirement,  stock option, stock purchase, stock ownership,  savings, stock
     appreciation  right,  profit sharing,  deferred  compensation,  consulting,
     bonus,  medical,   disability,   workers'  compensation,   vacation,  group
     insurance,  severance  and other  employee  benefit,  incentive and welfare
     policies,  contracts,  plans and  arrangements,  and all  trust  agreements
     related  thereto,  maintained by or  contributed to by Seller or any of the
     Seller  Subsidiaries in respect of any of the present or former  directors,
     officers,  or other employees of and/or consultants to Seller or any of the
     Seller  Subsidiaries  (collectively,  "Seller Employee Plans").  Seller has
     furnished  Buyers with the following  documents with respect to each Seller
     Employee  Plan:  (i) a true  and  complete  copy of all  written  documents
     comprising such Seller  Employee Plan (including  amendments and individual
     agreements  relating thereto) or, if there is no such written document,  an
     accurate and complete  description of the Seller  Employee  Plan;  (ii) the
     most  recently  filed Form 5500 or Form 5500-C/R  (including  all schedules
     thereto),  if applicable;  (iii) the most recent  financial  statements and
     actuarial reports,  if any; (iv) the summary plan description  currently in
     effect and all  material  modifications  thereof,  if any; and (v) the most
     recent IRS determination letter, if any.

          (b) All Seller Employee Plans have been maintained and operated in all
     material   respects  in  accordance  with  their  terms  and  the  material
     requirements  of  all  applicable   statutes,   orders,   rules  and  final
     regulations, including, without limitation, to the extent applicable, ERISA
     and the  Internal  Revenue  Code of 1986,  as  amended  (the  "Code").  All
     contributions  required to be made to Seller  Employee Plans have been made
     or reserved.

          (c) With  respect  to each of the  Seller  Employee  Plans  which is a
     pension plan (as defined in Section 3(2) of ERISA) (the  "Pension  Plans"):
     (i) each  Pension  Plan  which is  intended  to be  "qualified"  within the
     meaning  of  Section  401(a)  of the  Code  has  been  determined  to be so
     qualified  by the IRS and such  determination  letter  may  still be relied
     upon,  and each related trust is exempt from taxation  under Section 501(a)

                                       27
<PAGE>

     of the Code; (ii) the present value of all benefits vested and all benefits
     accrued  under each  Pension Plan which is subject to Title IV of ERISA did
     not, in each case,  as of the last  applicable  annual  valuation  date (as
     indicated  on  Schedule  2.19(a)),  exceed  the value of the  assets of the
     Pension Plan allocable to such vested or accrued benefits;  (iii) there has
     been no "prohibited  transaction,"  as such term is defined in Section 4975
     of the Code or Section 406 of ERISA,  which could  subject any Pension Plan
     or associated  trust, or Seller or any of the Seller  Subsidiaries,  to any
     material tax or penalty;  (iv) no defined benefit Pension Plan or any trust
     created thereunder has been terminated,  nor has there been any "reportable
     events"  with  respect  to any  Pension  Plan,  as that term is  defined in
     Section 4043 of ERISA since January 1, 1990; and (v) no Pension Plan or any
     trust created thereunder has incurred any "accumulated funding deficiency,"
     as such term is defined in Section 302 of ERISA (whether or not waived). No
     Pension Plan is a "multiemployer  plan," as that term is defined in Section
     3(37) of ERISA.

          (d) Except as  disclosed  in Schedule  2.19(d) or as  reflected on the
     Seller Financial Statements or the notes thereto, neither Seller nor any of
     the Seller Subsidiaries has any liability for any  post-retirement  health,
     medical or similar  benefit of any kind  whatsoever,  except as required by
     statute or regulation.

          (e) Neither Seller nor any of the Seller Subsidiaries has any material
     liability  under  ERISA or the Code as a result  of its being a member of a
     group described in Sections 414(b), (c), (m) or (o) of the Code.

          (f) Except as disclosed in Schedule 2.19(f), neither the execution nor
     delivery of this Agreement, nor the consummation of any of the transactions
     contemplated  hereby,  will (i) result in any payment  (including,  without
     limitation,   severance,  unemployment  compensation  or  golden  parachute
     payment)  becoming  due to any director or employee of Seller or any of the
     Seller  Subsidiaries  from any of such entities,  (ii) increase any benefit
     otherwise payable under any of the Seller Employee Plans or (iii) result in
     the  acceleration of the time of payment of any such benefit.  Seller shall
     use its best  efforts to insure that no amounts  paid or payable by Seller,
     the Seller  Subsidiaries  or Buyers to or with  respect to any  employee or
     former employee of Seller or any of the Seller Subsidiaries will fail to be
     deductible for federal income tax purposes by reason of Section 280G of the
     Code.

     2.20  Conduct of Seller to Date.  From and after  December 31, 1997 through
the  date of  this  Agreement,  except  as set  forth  in the  Seller  Financial
Statements and the Seller Reports:  (i) Seller and the Seller  Subsidiaries have
conducted  their  respective   businesses  in  the  ordinary  and  usual  course
consistent  with past  practices;  (ii) except upon the exercise of Seller Stock
Options,  neither Seller nor any of the Seller  Subsidiaries  has issued,  sold,
granted,  conferred or awarded any of its Equity  Securities,  or any  corporate
debt  securities  which would be classified  under GAAP as long-term debt on the
balance  sheets of Seller  or the  Seller  Subsidiaries;  (iii)  Seller  has not
effected  any stock  split or  adjusted,  combined,  reclassified  or  otherwise
changed its capitalization;  (iv) Seller has not declared, set aside or paid any
dividend (other than its regular quarterly  dividends) or other  distribution in
respect of its capital stock, or purchased,  redeemed,  retired,  repurchased or
exchanged, or otherwise acquired or disposed of, directly or indirectly,  any of
its Equity  Securities,  whether pursuant to the terms of such Equity Securities
or otherwise; (v) neither Seller nor any of the Seller Subsidiaries has incurred
any  obligation  or  liability  (absolute  or  contingent),  except  liabilities
incurred  in  the  ordinary  course  of  business  or  in  connection  with  the
transactions  contemplated  by this  Agreement,  or subjected to Lien any of its
assets or properties  other than in the ordinary  course of business  consistent
with past practice;  (vi) neither Seller nor any of the Seller  Subsidiaries has
discharged or satisfied any Lien or paid any  obligation or liability  (absolute
or  contingent),  other than in the ordinary  course of business;  (vii) neither
Seller  nor any of the  Seller  Subsidiaries  has sold,  assigned,  transferred,
leased,  exchanged,  or otherwise  disposed of any of its  properties  or assets
other than for a fair  consideration in the ordinary course of business;  (viii)
except as  required by  contract  or law,  neither  Seller nor any of the Seller

                                       28
<PAGE>
Subsidiaries  has (A) increased the rate of  compensation  of, or paid any bonus
to, any of its directors,  officers,  or other  employees,  except in accordance
with existing  policy,  (B) entered into any new, or amended or supplemented any
existing, employment, management, consulting, deferred compensation,  severance,
or other  similar  contract,  (C) entered  into,  terminated,  or  substantially
modified  any of the  Seller  Employee  Plans  or  (D)  agreed  to do any of the
foregoing;  (ix)  neither  Seller nor any Seller  Subsidiary  has  suffered  any
material damage, destruction, or loss, whether as the result of fire, explosion,
earthquake,  accident,  casualty,  labor  trouble,  requisition,  or  taking  of
property by any Regulatory Authority,  flood,  windstorm,  embargo, riot, act of
God or the enemy,  or other  casualty  or event,  and  whether or not covered by
insurance; (x) neither Seller nor any of the Seller Subsidiaries has canceled or
compromised any debt,  except for debts charged off or compromised in accordance
with the past practice of Seller and the Seller  Subsidiaries;  and (xi) neither
Seller  nor  any of the  Seller  Subsidiaries  has  entered  into  any  material
transaction, contract or commitment outside the ordinary course of its business,
except in connection with the transactions contemplated by this Agreement.

     2.21 Absence of Undisclosed Liabilities.

          (a) As of  December  31,  1997,  neither  Seller nor any of the Seller
     Subsidiaries  has  any  debts,  liabilities  or  obligations  equal  to  or
     exceeding  $50,000,  individually  or  $100,000 in the  aggregate,  whether
     accrued,  absolute,  contingent  or otherwise  and whether due or to become
     due,  which  would be  required  to be  reflected  in the Seller  Financial
     Statements or the notes thereto in accordance with GAAP except:

          (i)  debts,   liabilities  or  obligations  reflected  on  the  Seller
     Financial Statements and the notes thereto;

          (ii) operating leases reflected on Schedule 2.11(b); and

          (iii) debts,  liabilities or  obligations  incurred since December 31,
     1997 in the ordinary and usual course of their respective businesses,  none
     of  which  are  for  breach  of  contract,   breach  of  warranty,   torts,
     infringements  or lawsuits and none of which have a Material Adverse Effect
     on Seller and the Seller Subsidiaries, taken as a whole.

          (b)  Neither  Seller  nor  any of the  Seller  Subsidiaries  was as of
     December  31, 1997,  or since such date to the date hereof,  a party to any
     contract  or  agreement,   excluding   deposits,   loan   agreements,   and
     commitments, notes, security agreements,  repurchase and reverse repurchase
     agreements,  bankers'  acceptances,   outstanding  letters  of  credit  and
     commitments to issue letters of credit,  participation agreements and other
     documents  relating to  transactions  entered  into by Seller or any of the
     Seller  Subsidiaries in the ordinary  course of business,  that had, has or
     may be reasonably  expected to have a Material Adverse Effect on Seller and
     the Seller Subsidiaries, taken as a whole.

     2.22 Proxy Statement,  Etc. None of the information regarding Seller or any
of the Seller Subsidiaries to be supplied by Seller for inclusion or included in
(i)  the  Registration  Statement  on  Form  S-4 to be  filed  with  the  SEC by
Mercantile for the purpose of registering the shares of Mercantile  Common Stock
to be exchanged  for Seller  Common  Stock  pursuant to the  provisions  of this
Agreement (the "Registration Statement"),  (ii) the Proxy Statement to be mailed
to Seller's shareholders in connection with the meeting to be called to consider
this  Agreement  and the  Merger  (the  "Proxy  Statement")  or (iii)  any other
documents  to be filed with any  Regulatory  Authority  in  connection  with the
transactions  contemplated  hereby will, at the respective  times such documents
are filed with any  Regulatory  Authority  and, in the case of the  Registration
Statement,  when it becomes  effective and, with respect to the Proxy Statement,
when mailed, be false or misleading with respect to any material fact, o omit to
state any material fact  necessary in order to make the  statements  therein not
misleading  or, in the case of the Proxy  Statement or any amendment  thereof or
supplement thereto, at the time of the meeting of Seller's shareholders referred
to in Section 5.03, be false or misleading with respect to any material fact, or
omit to state any  material  fact  necessary  to correct  any  statement  in any

                                       29
<PAGE>
earlier  communication  with respect to the  solicitation  of any proxy for such
meeting.  All  documents  which r Seller or any of the  Seller  Subsidiaries  is
responsible  for filing with any  Regulatory  Authority in  connection  with the
Merger will comply as to form in all material  respects  with the  provisions of
applicable law.

     2.23  Registration  Obligations.  Neither  Seller  nor  any of  the  Seller
Subsidiaries  is under any  obligation,  contingent  or  otherwise,  which  will
survive  the  Effective  Time  by  reason  of  any  agreement  to  register  any
transaction  involving  any  of its  securities  under  the  Securities  Act.

     2.24 Tax, Regulatory and Accounting Matters.  Neither Seller nor any of the
Seller  Subsidiaries has taken or agreed to take any action or has any knowledge
of any fact or circumstance that would (i) prevent the transactions contemplated
hereby from qualifying as a reorganization  within the meaning of Section 368 of
the Code, (ii) materially impede or delay receipt of any approval referred to in
Section  6.01(b) or the  consummation of the  transactions  contemplated by this
Agreement or (iii) prevent or impede the transactions  contemplated  hereby from
qualifying for pooling-of-interests accounting treatment.

     2.25 Brokers and Finders. Except for ABN AMRO Incorporated,  neither Seller
nor  any of the  Seller  Subsidiaries  nor  any of  their  respective  officers,
directors  or  employees  has  employed  any  broker or finder or  incurred  any
liability  for any financial  advisory  fees,  brokerage  fees,  commissions  or
finder's  fees,  and no broker or finder has acted  directly or  indirectly  for
Seller or any of the Seller  Subsidiaries  in connection  with this Agreement or
the transactions contemplated hereby.

     2.26 Interest Rate Risk Management Instruments

          (a) Set forth on  Schedule  2.26(a) is a list as of the date hereof of
     all  interest  rate swaps,  caps,  floors and option  agreements  and other
     interest rate risk  management  arrangements  to which Seller or any of the
     Seller  Subsidiaries  is a party or by which  any of  their  properties  or
     assets may be bound.

          (b) All such interest rate swaps,  caps,  floors and option agreements
     and other interest rate risk management arrangements to which Seller or any
     of the Seller  Subsidiaries is a party or by which any of their  properties
     or assets may be bound were entered into in the ordinary course of business
     and, to the best knowledge of Seller,  in accordance  with prudent  banking
     practice and  applicable  rules,  regulations  and  policies of  Regulatory
     Authorities and with counterparties  believed to be financially responsible
     at the time and are legal,  valid and  binding  obligations  of Seller or a
     Seller Subsidiary and are in full force and effect.  Seller and each of the
     Seller  Subsidiaries has duly performed in all material respects all of its
     obligations  thereunder to the extent that such obligations to perform have
     accrued,  and to the  best  knowledge  of  Seller,  there  are no  material
     breaches,  violations or defaults or  allegations  or assertions of such by
     any party thereunder.

     2.27 Accuracy of Information.  The statements  contained in this Agreement,
the  Schedules and any other  written  document  executed and delivered by or on
behalf of Seller pursuant to the terms of this Agreement are true and correct as
of the date hereof or as of the date  delivered  in all material  respects,  and
such  statements  and documents do not omit any material fact  necessary to make
the statements contained therein not misleading.

     2.28 Year 2000 Compliant.  To the best knowledge of Seller, both Seller and
the Seller  Subsidiaries have complied with regulatory  bulletins issued through
February 28, 1998 by the Federal Financial  Institutions  Examination Council on
the subject of Year 2000  Compliance.  Seller and the Seller  Subsidiaries  have
exercised ordinary care in assessing Year 2000 Compliance status of all material
computer software, firmware and hardware used in the ordinary course of business
as set forth o Schedule 2.28, which is a Y2K Inventory & Risk Assessment Matrix.
Seller and the Seller  Subsidiaries  shall continue to work through Closing with
its vendors to renovate or replace non-compliant computer software, firmware and
hardware in order to ensure that the testing of renovated  or replaced  items is
substantially underway by December 31, 1998.

                                       30
<PAGE>
                                   ARTICLE III
                                   -----------
                 REPRESENTATIONS AND WARRANTIES OF THE BUYERS 

     As an inducement to Seller to enter into and perform its obligations  under
this Agreement,  and  notwithstanding any examinations,  inspections,  audits or
other  investigations made by Seller, the Buyers hereby represent and warrant to
Seller as follows: 

     3.01  Organization  and  Authority.  Mercantile  and  Merger  Sub are  each
corporations  duly  organized,  validly  existing and in good standing under the
laws of the State of Missouri, are each qualified to do business and are each in
good standing in all jurisdictions where its ownership or leasing of property or
the conduct of its  business  requires it to be so  qualified,  except where the
failure  to be so  qualified  would  not  have  a  Material  Adverse  Effect  on
Mercantile and its  Subsidiaries,  taken as a whole, and has corporate power and
authority to own its properties and assets and to carry on its business as it is
now being  conducted.  Each of Mercantile and Merger Sub is registered as a bank
holding company with the Federal Reserve Board under the BHCA.

     3.02  Capitalization  of  Mercantile.   The  authorized  capital  stock  of
Mercantile  consists of (i)  400,000,000  shares of Mercantile  Common Stock, of
which, as of April 23, 1998,  134,960,625  shares were issued and  [133,115,227]
were  outstanding  and (ii) 5,000,000  shares of preferred  stock,  no par value
("Mercantile  Preferred  Stock"),  issuable  in series,  of which as of the date
hereof,  no shares  were  issued  and  outstanding.  Mercantile  has  designated
2,000,000 shares of Mercantile Preferred Stock as "Series A Junior Participating
Preferred Stock" and has reserved such shares under a Rights Agreement dated May
23, 1988 between Mercantile and Mercantile Bank National Association,  as Rights
Agent (the "Rights Agreement" and, the rights to be issued pursuant thereto, the
"Rights").  As of March 31, 1998, Mercantile had reserved: (i) 13,836,802 shares
of  Mercantile  Common  Stock  for  issuance  under   Mercantile's   Shareholder
Investment  Plan (the  "Investment  Plan") and various  employee and/or director
stock  option,   incentive  and/or  benefit  plans  (collectively,   "Mercantile
Employee/Director  Stock Grants");  (ii) 2,077,000  shares of Mercantile  Common
Stock for issuance upon the acquisition of Financial Services Corporation of the
Midwest ("FSCM") pursuant to the Agreement and Plan of Merger, dated as of April
13, 1998, by and among  Mercantile,  Merger Sub and FSCM; (iii) 5,400,000 shares
of Mercantile  Common Stock for issuance upon the acquisition of CBT Corporation
("CBT")  pursuant to the Agreement  and Plan of Merger,  dated as of January 10,
1998, by and among Mercantile, Merger Sub and CBT; and (iv) 13,800,000 shares of
Mercantile  Common  Stock for  issuance  upon the  acquisition  of  Firstbank of
Illinois ("Firstbank") pursuant to the Agreement and Plan of Merger, dated as of
January 30, 1998, by and among Mercantile,  Merger Sub and Firstbank. From March
31, 1998  through the date of this  Agreement,  no shares of  Mercantile  Common
Stock have been issued,  excluding  any such shares which may have been issued i
connection  with the  Investm  ent Plan or  Mercantile  Employee/Director  Stock
Grants. 

     Mercantile continually evaluates possible acquisitions and may prior to the
Effective  Time  enter  into  one or  more  agreements  providing  for,  and may
consummate,  the  acquisition by it of another bank,  association,  bank holding
company,  savings  and loan  holding  company  or other  company  (or the assets
thereof) for  consideration  that may include  Equity  Securities.  In addition,
prior to the Effective Time,  Mercantile may, depending on market conditions and
other  factors,  otherwise  determine to issue  equity,  equity-linked  or other
securities  for  financing   purposes  or  repurchase  its  outstanding   Equity
Securities. Notwithstanding the foregoing, neither Mercantile nor any Mercantile
Subsidiary  has taken or agreed to take any action or has any  knowledge  of any
fact or circumstance and neither  Mercantile nor Merger Sub will take any action
that would (i) prevent the transactions contemplated hereby from qualifying as a
reorganization  within the meaning of Section 368 of the Code,  (ii)  materially
impede or delay  receipt of any approval  referred to in Section  6.01(b) or the
consummation of the transactions contemplated by this Agreement or (iii) prevent
or  impede  the  Merger  from  qualifying  for  pooling-of-interests  accounting
treatment.  Except as set forth above,  there are no other Equity  Securities of

                                       31
<PAGE>
Mercantile  outstanding.  All of the issued and outstanding shares of Mercantile
Common Stock are validly  issued,  fully paid, and  nonassessable,  and have not
been  issued  in  violation  of  any  preemptive  right  of any  shareholder  of
Mercantile.  At the Effective Time, the Mercantile  Common Stock to be issued in
the  Merger  will  be  duly   authorized,   validly   issued,   fully  paid  and
nonassessable,  will not be issued in violation of any  preemptive  right of any
shareholder of Mercantile. 

     3.03 Authorization.
          --------------

          (a)  Mercantile  and  Merger  Sub each  has the  corporate  power  and
     authority to enter into this  Agreement  and to carry out their  respective
     obligations  hereunder.  The  execution,  delivery and  performance of this
     Agreement by Mercantile and Merger Sub and the  consummation  by Mercantile
     and  Merger  Sub of the  transactions  contemplated  hereby  have been duly
     authorized by all requisite  corporate action of Mercantile and Merger Sub.
     Subject to the receipt of such approvals of the  Regulatory  Authorities as
     may be required by statute or  regulation,  this  Agreement  is a valid and
     binding obligation of Mercantile and Merger Sub enforceable against each in
     accordance with its terms. 

          (b) Neither the execution,  delivery and performance by Mercantile and
     Merger Sub of this Agreement, nor the consummation by Mercantile and Merger
     Sub of the transactions  contemplated  hereby, nor compliance by Mercantile
     and  Merger  Sub  with any of the  provisions  hereof,  will  (i)  violate,
     conflict with or result in a breach of any  provisions  of, or constitute a
     default (or an event  which,  with  notice or lapse of time or both,  would
     constitute a default) or result in f the  termination of, or accelerate the
     performance   required  by,  or  result  in  a  right  of   termination  or
     acceleration  of, or result in the  creation  of,  any Lien upon any of the
     properties  or assets of  Mercantile  or Merger Sub under any of the terms,
     conditions or provisions of (x) their respective  Articles of Incorporation
     or By-Laws,  or (y) any note,  bond,  mortgage,  indenture,  deed of trust,
     license,  lease,  agreement  or other  instrument  or  obligation  to which
     Mercantile  or Merger Sub is a party or by which  they may be bound,  or to
     which  Mercantile  or Merger Sub or any of their  respective  properties or
     assets may be subject,  or (ii) subject to compliance with the statutes and
     regulations referred to in subsection (c) of this Section 3.03, violate any
     judgment,  ruling,  order,  writ,  injunction,  decree,  statute,  rule  or
     regulation  applicable  to  Mercantile  or  Merger  Sub  or  any  of  their
     respective   properties  or  assets;  other  than  violations,   conflicts,
     breaches,  defaults,  terminations,  accelerations or Liens which would not
     have a Material Adverse Effect on Mercantile and its Subsidiaries, taken as
     a whole.

          (c) Other than in connection with or in compliance with the provisions
     of the Missouri  Statute,  the IBCA, the Securities  Act, the Exchange Act,
     the securities or blue sky laws of the various states or filings, consents,
     reviews,  authorizations,  approvals or exemptions required under the BHCA,
     the FDI Act or any required approvals of any other Regulatory Authority, no
     notice to, filing with,  exemption or review by, or authorization,  consent
     or  approval  of,  any  public  body  or  authority  is  necessary  for the
     consummation by Mercantile and Merger Sub of the transactions  contemplated
     by this Agreement.

     3.04 Mercantile  Financial  Statements.  The consolidated balance sheets of
Mercantile  and its  Subsidiaries  as of December  31,  1997,  1996 and 1995 and
related consolidated  statements of income,  changes in shareholders' equity and
cash flows for each of the three years in the period  ended  December  31, 1997,
together with the notes thereto, audited by KPMG Peat Marwick LLP, as filed with
the SEC on Form 10-K for the year ended  December  31, 1997  (collectively,  the
"Mercantile Financial Statements"),  have been prepared in accordance with GAAP,
present  fairly  the  consolidated  financial  position  of  Mercantile  and its
Subsidiaries  at the dates thereof and the  consolidated  results of operations,
changes  in   shareholders'   equity  and  cash  flows  of  Mercantile  and  its
Subsidiaries  for the periods  stated therein and are derived from the books and
records of Mercantile and its  Subsidiaries,  which are complete and accurate in
all material  respects and have been maintained in accordance with good business
practices.  Neither  Mercantile  nor any of its  Subsidiaries  has any  material
contingent  liabilities  that  are not  described  in the  Mercantile  Financial
Statements.

                                       32
<PAGE>
     3.05 Mercantile Reports.  Since January 1, 1995, each of Mercantile and its
Subsidiaries  has  filed  any and all  reports,  registrations  and  statements,
together with any required amendments thereto, that it was required to file with
any Regulatory  Authority.  All such reports and statements  filed with any such
Regulatory  Authority  are  collectively  referred to herein as the  "Mercantile
Reports." As of its respective  date,  each  Mercantile  Report  complied in all
material  respects  with  all  the  rules  and  regulations  promulgated  by the
applicable  Regulatory  Authority and did not contain any untrue  statement of a
material fact or omit to state a 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.

     3.06 Material  Adverse Effect.  Since December 31, 1997,  there has been no
Material  Adverse Effect on Mercantile and its  Subsidiaries,  taken as a whole.

     3.07  Registration  Statement,  Etc.  None  of  the  information  regarding
Mercantile or any of its  Subsidiaries to be supplied by Buyers for inclusion or
included in (i) the Registration  Statement,  (ii) the Proxy Statement, or (iii)
any other documents to be filed with any Regulatory Authority in connection with
the  transactions  contemplated  hereby  will,  at  the  respective  times  such
documents  are  filed  with any  Regulatory  Authority  and,  in the case of the
Registration Statement, when it becomes effective and, with respect to the Proxy
Statement,  when  mailed,  be false or  misleading  with respect to any material
fact,  or omit to  state  any  material  fact  necessary  in  order  to make the
statements  therein not misleading or, in the case of the Proxy Statement or any
amendment thereof or supplement  thereto, at the time of the meeting of Seller's
shareholders referred to in Section 5.03, be false or misleading with respect to
any material  fact, or omit to state any material fact  necessary to correct any
statement in any earlier  communication  with respect to the solicitation of any
proxy for such  meeting.  All  documents  which  Mercantile  or  Merger  Sub are
responsible  for filing with any  Regulatory  Authority in  connection  with the
Merger will comply as to form in all material  respects  with the  provisions of
applicable law.

     3.08 Brokers and Finders.  Neither Mercantile,  Merger Sub nor any of their
respective officers, directors or employees has employed any broker or finder or
incurred  any  liability  for  any  financial  advisory  fees,  brokerage  fees,
commissions  or  finder's  fees,  and no broker or finder has acted  directly or
indirectly for Mercantile or Merger Sub in connection with this Agreement or the
transactions contemplated hereby.

     3.09 Accuracy of  Information.  The statements  contained in this Agreement
and any other written document  executed and delivered by or on behalf of Buyers
pursuant  to the terms of this  Agreement  are true and  correct  as of the date
hereof in all material  respects,  and such statements and documents do not omit
any  material  fact  necessary  to make the  statements  contained  therein  not
misleading.

                                   ARTICLE IV
                                   ----------
                CONDUCT OF BUSINESSES PRIOR TO THE EFFECTIVE TIME

     4.01 Conduct of Businesses  Prior to the Effective Time.  During the period
from the date of this  Agreement to the Effective  Time,  Seller and each of the
Seller Subsidiaries shall conduct their businesses according to the ordinary and
usual course consistent with past and current practices and shall use their best
efforts to maintain and preserve  their  business  organization,  employees  and
advantageous  business  relationships  and retain the services of their officers
and key employees. 

     4.02  Forbearances  of Seller  Except as set forth in  Schedule  4.02,  and
except to the extent  required by law,  regulation or Regulatory  Authority,  or
with the prior written consent of Buyers (unless otherwise specifically noted in
this  Section  4.02),  during the period from the date of this  Agreement to the
Effective  Time,  Seller  shall  not and  shall  not  permit  any of the  Seller
Subsidiaries to:

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<PAGE>
          (a) declare,  set aside or pay any  dividends or other  distributions,
     directly  or  indirectly,  in  respect of its  capital  stock  (other  than
     dividends  from any of the Seller  Subsidiaries  to Seller or to another of
     the Seller  Subsidiaries),  except  that Seller may declare and pay regular
     quarterly  cash  dividends of not more than $0.2725 per share on the Seller
     Common  Stock;  provided,  however,  that Seller shall not declare or pay a
     quarterly  dividend  for any  quarter in whic Seller  shareholders  will be
     entitled  to  receive  a  regular  quarterly  dividend  on  the  shares  of
     Mercantile Common Stock to be issued in the Merger;

          (b) enter into or amend any employment, severance or similar agreement
     or arrangement with any director, officer or employee, or materially modify
     any of the Seller  Employee  Plans or grant any salary or wage  increase or
     materially  increase any  employee  benefit  (including  incentive or bonus
     payments),  except (i)  normal  individual  increases  in  compensation  to
     employees  consistent  with  past  practice,  (ii)  as  required  by law or
     contract,  (iii) such increases of which Seller  notifies Buyers in writing
     and which  Buyers do not  disapprove  within 10 days of the receipt of such
     notice and (iv) pursuant to the provisions of Section 5.10 hereof;

          (c)  authorize,   recommend,  propose  or  announce  an  intention  to
     authorize,  recommend  or propose,  or enter into an agreement in principle
     with respect to, any merger,  consolidation or business  combination (other
     than the  Merger),  any  acquisition  of a  material  amount  of  assets or
     securities, any disposition of a material amount of assets or securities or
     any release or relinquishment of any material contract rights;

          (d) propose or adopt any  amendments to its Articles of  Incorporation
     or other charter document or By-Laws;

          (e) issue, sell, grant,  confer or award any of its Equity Securities,
     except  that the  Seller  may  issue  shares of Seller  Common  Stock  upon
     exercise  of the  Seller  Stock  Options  outstanding  on the  date of this
     Agreement  and pursuant to the option  granted to  Mercantile in connection
     with the transaction  contemplated  by this Agreement,  or effect any stock
     split or adjust, combine, reclassify or otherwise change its capitalization
     as it existed on the date of this Agreement;

          (f) purchase,  redeem,  retire,  repurchase or exchange,  or otherwise
     acquire  or  dispose  of,  directly  or  indirectly,   any  of  its  Equity
     Securities,  whether  pursuant  to the terms of such Equity  Securities  or
     otherwise;

          (g) without first consulting with and obtaining the written consent of
     Mercantile,  cause or permit FNBI to enter into, renew or increase any loan
     or credit commitment  (including  stand-by letters of credit) to, or invest
     or agree to invest in any  person or entity or modify  any of the  material
     provisions  or renew or otherwise  extend the maturity date of any existing
     loan or credit commitment  (collectively,  "Lend to") in an amount equal to
     or in excess of $1,000,000 or in any amount which, when aggregated with any
     and all loans or credit  commitments of Seller and the Seller  Subsidiaries
     to such  person or  entity,  would be equal to or in excess of  $1,000,000;
     provided,  however,  that Seller or any of the Seller Subsidiaries may make
     any such loan or credit  commitment  in the event (A)  Seller or any Seller
     Subsidiary  has delivered to Buyers or their  designated  representative  a
     notice of its intention to make such loan and such information as Buyers or
     their designated  representative  may reasonably require in respect thereof
     and (B) Buyers or their designated representative shall not have reasonably
     objected  to such  loan by  giving  written  or  facsimile  notice  of such
     objection  within two (2) business days following the delivery to Buyers or
     their designated  representative of the notice of intention and information
     as aforesaid;  provided  further,  however,  that nothing in this paragraph
     shall  prohibit   Seller  or  any  Seller   Subsidiary  from  honoring  any
     contractual  obligation  in  existence  on  the  date  of  this  Agreement.
     Notwithstanding  this Section 4.02(g),  Seller shall be authorized  without
     first consulting with Buyers or obtaining Buyers' prior written consent, to
     cause or  permit  FNBI to  increase  the  aggregate  amount  of any  credit
     facilities theretofore established in favor of any person or entity (each a
     "Pre-Existing Facility"), provided that the aggregate amount of any and all
     such  increases  shall  not be in  excess  of  the  lesser  of 10% of  such
     Pre-Existing Facilities or $50,000;

                                       34
<PAGE>
          (h) directly or indirectly (including through its officers, directors,
     employees or other representatives) (i) initiate,  solicit or encourage any
     discussions,  inquiries  or  proposals  with any third  party  (other  than
     Buyers)  relating  to the  disposition  of any  significant  portion of the
     business  or  assets of Seller  or any of the  Seller  Subsidiaries  or the
     acquisition   of  Equity   Securities  of  Seller  or  any  of  the  Seller
     Subsidiaries or the merger of Seller or any of the Seller Subsidiaries with
     any person  (other  than  Buyers)  or any  similar  transaction  (each such
     transaction being referred to herein as an "Acquisition Transaction"), (ii)
     provide any such person with  information  or assistance or negotiate  with
     any such  person with  respect to an  Acquisition  Transaction,  and Seller
     shall promptly notify Buyers orally of all the relevant details relating to
     all inquiries,  indications of interest and proposals  which it may receive
     with respect to any Acquisition Transaction;

          (i) take any action that would (i) prevent or impede the  transactions
     contemplated hereby from qualifying as a reorganization  within the meaning
     of  Section  368  of  the  Code,  (ii)  materially   impede  or  delay  the
     consummation  of the  transactions  contemplated  by this  Agreement or the
     ability  of  Buyers or Seller to  obtain  any  approval  of any  Regulatory
     Authority  required for the transactions  contemplated by this Agreement or
     to perform its  covenants and  agreements  under this  Agreement,  or (iii)
     prevent or impede  the  Merger  from  qualifying  for  pooling-of-interests
     accounting treatment;

          (j) other than in the ordinary course of business consistent with past
     practice,  incur any indebtedness for borrowed money or assume,  guarantee,
     endorse or otherwise as an accommodation  become  responsible or liable for
     the obligations of any other individual, corporation or other entity;

          (k)  materially   restructure  or  change  its  investment  securities
     portfolio,  through purchases,  sales or otherwise,  or the manner in which
     the portfolio is classified or reported,  or execute individual  investment
     transactions  for its own  account  of  greater  than  $1,000,000  for U.S.
     Treasury or Federal Agency Securities and $250,000 for all other investment
     instruments;

          (l) agree in writing or otherwise to take any of the foregoing actions
     or engage in any activity, enter into any transaction or intentionally take
     or omit to take any other act which  would make any of the  representations
     and warranties in Article II of this  Agreement  untrue or incorrect in any
     material  respect if made anew after  engaging in such  activity,  entering
     into such transaction, or taking or omitting such other act; or

          (m)  enter  into,  increase  or renew  any loan or  credit  commitment
     (including  standby letters of credit) to any executive officer or director
     of Seller or any of the Seller  Subsidiaries,  any holder of 10% or more of
     the outstanding  shares of Seller Common Stock,  or any entity  controlled,
     directly  or  indirectly,  by  any  of  the  foregoing  or  engage  in  any
     transaction with any of the foregoing which is of the type or nature sought
     to be regulated in 12 U.S.C.  ss. 371c and 12 U.S.C.  ss.  371c-1,  without
     first  obtaining the prior written  consent of Buyers,  which consent shall
     not  be  unreasonably  withheld.  For  purposes  of  this  subsection  (m),
     "control" shall have the meaning  associated with that term under 12 U.S.C.
     ss. 371c.

     4.03  Forbearances  of the Buyers.  During the period from the date of this
Agreement to the Closing Date,  the Buyers shall not,  without the prior consent
of Seller,  agree in writing or otherwise to engage in any activity,  enter into
any    transaction    or   take   or   omit   to   take   any   other    action:

          (a) that would (i)  prevent or impede  the  transactions  contemplated
     hereby from  qualifying as a  reorganization  within the meaning of Section
     368 of the Code,  (ii) materially  impede or delay the  consummation of the
     transactions contemplated by this Agreement or the ability of Mercantile or
     Seller  to obtain  any  necessary  approvals  of any  Regulatory  Authority
     required for the transactions  contemplated by this Agreement or to perform
     its  covenants and  agreements  under this  Agreement,  or (iii) prevent or
     impede the  Merger  from  qualifying  for  pooling-of-interests  accounting
     treatment; or

                                       35
<PAGE>
          (b) which  would make any of the  representations  and  warranties  of
     Article III of this Agreement  untrue or incorrect in any material  respect
     if  made  anew  after  engaging  in  such  activity,   entering  into  such
     transaction, or taking or omitting such other action.

                                    ARTICLE V
                                    ---------
                              ADDITIONAL AGREEMENTS

     5.01 Access and  Information;  Due Diligence.  Buyers and Seller shall each
afford  to  the  other,  and to  the  other's  accountants,  counsel  and  other
representatives,  full access during normal  business  hours,  during the period
prior  to  the  Effective  Time,  to all  their  respective  properties,  books,
contracts,  commitments and records and, during such period,  each shall furnish
promptly to the other (i) a copy of each  report,  schedule  and other  document
filed or  received by it during such  period  pursuant  to the  requirements  of
federal and state securities laws and (ii) all other information  concerning its
business,  properties  and personnel as the other may reasonably  request.  Each
party  shall,  and shall cause its  advisors  and  representatives  to, (A) hold
confidential  all  information  obtained  in  connection  with  any  transaction
contemplated  hereby with respect to the other party and its Subsidiaries  which
is not otherwise  public  knowledge,  (B) in the event of a termination  of this
Agreement,  return all documents  (including copies thereof) obtained  hereunder
from the  other  party or any of its  Subsidiaries  to such  other  party or its
Subsidiaries  and (C) use its best  efforts  to cause all  information  obtained
pursuant  to this  Agreement  or in  connection  with  the  negotiation  of this
Agreement to be treated as confidential  and not use, or knowingly permit others
to use, any such information unless such information becomes generally available
to the public.

     5.02 Registration Statement; Regulatory Matters.

          (a) Mercantile shall prepare and, subject to the review and consent of
     Seller with  respect to matters  relating to Seller,  file with the SEC the
     Registration  Statement (or the equivalent in the form of preliminary proxy
     materials)  with  respect to the shares of  Mercantile  Common  Stock to be
     issued in the Merger and the exercise of the Seller Stock Options after the
     Effective  Time.  Mercantile  shall  promptly  prepare and,  subject to the
     review and  consent of Seller with  respect to matters  relating to Seller,
     use its  best  efforts  to file as  soon as is  reasonably  practicable  an
     application for approval of the Merger with the Federal Reserve Board,  and
     such additional regulatory  authorities as may require an application,  and
     shall use its best  efforts to cause the  Registration  Statement to become
     effective. Mercantile shall also take any action required to be taken under
     any  applicable  state blue sky or securities  laws in connection  with the
     issuance of such shares and the  exercise of such  options,  and Seller and
     the Seller Subsidiaries shall furnish Mercantile all information concerning
     Seller  and  the  Seller  Subsidiaries  and  the  shareholders  thereof  as
     Mercantile may reasonably request in connection with any such action.

          (b) Seller and Buyers shall  cooperate and use their  respective  best
     efforts to prepare all  documentation,  to effect all filings and to obtain
     all permits,  consents,  approvals and  authorizations of all third parties
     and  Regulatory   Authorities  necessary  to  consummate  the  transactions
     contemplated  by this Agreement  and, as and if directed by Mercantile,  to
     consummate such other transactions by and among  Mercantile's  Subsidiaries
     and the Seller  Subsidiaries  concurrently  with or following the Effective
     Time,  provided,  however,  that such actions do not: (i) prevent or impede
     the  transactions  contemplated  hereby from qualifying as a reorganization
     within the meaning of Section 368 of the Code;  (ii)  materially  impede or
     delay the receipt of any  approval  referred to in Section  6.01(b);  (iii)
     prevent or impede the transactions  contemplated hereby from qualifying for
     pooling-of-interests   accounting   treatment  unless  Buyers  first  waive
     Seller's covenants in Sections 5.02(b) and 5.16 hereof and the condition to
     Buyers'  obligation to consummate  the Merger set forth in Section  6.03(f)
     hereof;  or  (iv)  materially  impede  or  delay  the  consummation  of the
     transactions contemplated by this Agreement.

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<PAGE>
          5.03 Shareholder Approval.  Seller shall call a special meeting of its
     shareholders  to be held as soon as is reasonably  possible for the purpose
     of voting  upon this  Agreement  and the Merger  and  related  matters.  In
     connection  with such meeting,  Mercantile  shall  prepare,  subject to the
     review and consent of Seller,  the Proxy Statement  (which shall be part of
     the Registration Statement to be filed with the SEC by Mercantile) and mail
     the same to the  shareholders  of Seller.  The Board of Directors of Seller
     shall submit for approval of Seller's  shareholders the matters to be voted
     upon at such  meeting.  The Board of Directors  of Seller  hereby does and,
     subject to the  fiduciary  duties of the Seller's  Board of  Directors,  as
     advised by outside legal  counsel,  will  recommend  this Agreement and the
     transactions  contemplated hereby to the shareholders of Seller and use its
     reasonable  best  efforts  to  obtain  any  vote of  Seller's  shareholders
     necessary for the approval of this Agreement. 

          5.04  Current  Information.  During the  period  from the date of this
     Agreement to the Closing  Date,  (i) each party will  promptly  furnish the
     other with copies of all monthly and other interim financial  statements as
     the same become  available  and shall  cause one or more of its  designated
     representatives   to  confer  on  a  regular   and   frequent   basis  with
     representatives  of the other  party  and (ii)  Mercantile  shall  promptly
     furnish to the Seller copies of all filings by Mercantile  with each of the
     Federal  Reserve  Board and the SEC. Each party shall  promptly  notify the
     other  party of the  following  events  immediately  upon  learning  of the
     occurrence thereof, describing the same and, if applicable, the steps being
     taken by the affected party with respect thereto: (a) the occurrence of any
     event which could cause any representation or warranty of such party or any
     schedule, statement, report, notice, certificate or other writing furnished
     by such party to be untrue or misleading in any material  respect;  (b) any
     Material   Adverse  Effect;   (c)  the  issuance  or  commencement  of  any
     governmental  and/or regulatory agency complaint,  investigation or hearing
     or any communications  indicating that the same may be contemplated and, as
     to  any  such  matter  which  shall  now or  hereafter  be in  effect,  any
     communications  pertaining thereto; or (d) the institution or the threat of
     any material litigation involving such party.

     5.05 Conforming Entries.

          (a)  Notwithstanding  that  Seller  believes  that  Seller  and Seller
     Subsidiaries  have  established  all reserves and taken all  provisions for
     possible  loan  losses  required  by GAAP and  applicable  laws,  rules and
     regulations, Seller recognizes that Buyers may have adopted different loan,
     accrual and reserve policies (including loan  classifications and levels of
     reserves  for  possible  loan  losses).  From  and  after  the date of this
     Agreement,  Seller and Buyers shall consult and  cooperate  with each other
     with respect to conforming the loan, accrual and reserve policies of Seller
     and the Seller  Subsidiaries  to those policies of Buyers,  as specified in
     each  case in  writing  to  Seller,  based  upon such  consultation  and as
     hereinafter provided.

          (b) In addition, from and after the date of this Agreement, Seller and
     Buyers  shall  consult  and  cooperate  with each  other  with  respect  to
     determining appropriate Seller accruals,  reserves and charges to establish
     and take in respect of excess equipment  write-off or write-down of various
     assets and other appropriate charges and accounting adjustments taking into
     account the parties'  business plans following the Merger,  as specified in
     each case in  writing  to  Seller,  based  upon such  consultati  on and as
     hereinafter provided.

          (c) Seller and Buyers shall consult and cooperate with each other with
     respect to  determining  the amount  and the  timing  for  recognizing  for
     financial  accounting  purposes  Seller's  expenses  of the  Merger and the
     restructuring  charges,  if any, related to or to be incurred in connection
     with the Merger.

                                       37
<PAGE>
          (d) With respect to clauses (a) through (c) of this Section  5.05,  it
     is the objective of  Mercantile  and Seller that such  reserves,  accruals,
     charges and  divestitures,  if any, to be taken  shall be  consistent  with
     GAAP.

     5.06  Environmental  Reports.  Buyers may  perform,  as soon as  reasonably
practicable,  but not later than ninety (90) days after the date hereof, a phase
one  environmental   investigation   and/or  asbestos  survey  by  Environmental
Operations,  Inc. or any other firm designated by Buyers, or any of them, on all
real  property  owned,  leased  or  operated  by  Seller  or any  of the  Seller
Subsidiaries  as of the date hereof (but  excluding  space in retail and similar
establishments  leased by Seller for  automatic  teller  machines or leased bank
branch  facilities  where the space leased  comprises less than 20% of the total
space leased to all tenants of such property) and within fifteen (15) days after
being  notified  by Sellers  of the  acquisition  or lease of any real  property
acquired  or leased by Seller or any of the Seller  Subsidiaries  after the date
hereof  (but  excluding  space in retail and  similar  establishments  leased by
Seller for automatic  teller machines or leased bank facilities  where the space
leased  comprises less than 20% of the total space leased to all tenants of such
property).  If the results of the phase one investigation  indicate,  in Buyers'
reasonable  opinion,  that  additional  investigation  is warranted,  Buyers may
perform,   at  Buyers'  expense,   a  phase  two  subsurface   investigation  or
investigations by Environmental Operations, Inc. on properties deemed to warrant
such additional study.  Buyers shall perform any such phase two investigation as
soon as reasonably practicable after receipt of the phase one report(s) for such
properties and, in any event, shall notify Seller and Environmental  Operations,
Inc.  within  fifteen  (15) days  after  receipt  of the phase one  report  that
Environmental  Operations,  Inc.  should  promptly  commence  any such phase two
investigation.  Should  the cost of  taking  all  remedial  or other  corrective
actions and measures  (i)  required by  applicable  law or (ii)  recommended  by
Environmental  Operations,  Inc. in such phase one or two report or reports,  in
the  aggregate,  t  exceed  the sum of  $500,000,  as  reasonably  estimated  by
Environmental  Operations,  Inc.,  or if the cost of such  actions  or  measures
cannot be so reasonably estimated by Environmental  Operations,  Inc. to be such
amounts or less with any reasonable  degree of certainty,  Buyers shall have the
right pursuant to Section 7.01(e) hereof,  for a period of fifteen (15) business
days following receipt from Environmental  Operations,  Inc. of such estimate or
indication  that the cost of such actions and measures  cannot be so  reasonably
estimated, to terminate this Agreement.

     5.07 Agreements of Affiliates.  Set forth as Schedule 5.07 is a list (which
includes all  individual and  beneficial  ownership and also  identifies how all
such  beneficially  owned  shares are  registered  on the stock  record  book of
Seller) of all persons  whom Seller  believes to be  "affiliates"  of Seller for
purposes  of Rule 145  under  the  Securities  Act and for  pooling-of-interests
accounting treatment. Seller shall use its best efforts to cause each person who
is  identified  as an "  affiliate"  to  deliver to  Mercantile,  as of the date
hereof,   or  as  soon  as  practicable   hereafter,   a  written  agreement  in
substantially  the form set forth as Exhibit A to this Agreement  providing that
each such person will agree not to sell,  pledge,  transfer or otherwise dispose
of the shares of  Mercantile  Common  Stock to be received by such person in the
Merger during the period  designated in such letter and thereafter in compliance
with the applicable provisions of the Securities Act. Prior to the Closing Date,
and via letter, Seller shall amend and supplement Schedule 5.07 and use its best
efforts to cause each  additional  person who is identified as an "affiliate" to
execute a written agreement as provided in this Section 5.07.

     5.08  Expenses.  Each party hereto shall bear its own expenses  incident to
preparing, entering into and carrying out this Agreement and to consummating the
Merger;  provided,   however,  that  any  and  all  fees  (excluding  reasonable
out-of-pocket  expenses) paid by Seller to its legal  counsel,  Sidley & Austin,
related  to the  preparation  of this  Agreement  and all other  agreements  and
documentation   in  connection  with  the   consummation  of  the   transactions
contemplated herein, shall not exceed $100,000;  provided further, however, that
Buyers shall pay all printing  expenses and filing fees  incurred in  connection
with this Agreement, the Registration Statement and the Proxy Statement.

                                       38
<PAGE>
     5.09 Miscellaneous Agreements and Consents.

          (a) Subject to the terms and conditions  herein provided,  each of the
     parties hereto agrees to use its respective  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  and  make  effective  the  transactions  contemplated  by  this
     Agreement as  expeditiously  as possible,  including,  without  limitation,
     using its  respective  best  efforts to lift or rescind any  injunction  or
     restraining  order or other order  adversely  affecting  the ability of the
     parties to consummate  the  transactions  contemplated  hereby.  Each party
     shall, and shall cause each of its respective Subsidiaries to, use its best
     efforts to obtain consents of all third parties and Regulatory  Authorities
     necessary or, in the opinion of Buyers,  desirable for the  consummation of
     the transactions contemplated by this Agreement.

          (b)  Seller,  prior to the  Effective  Time,  shall  (i)  consult  and
     cooperate with Buyers  regarding the  implementation  of those policies and
     procedures  established  by  Buyers  for  its  governance  and  that of its
     Subsidiaries   and  not  otherwise   referenced  in  Section  5.05  hereof,
     including,  without limitation,  policies and procedures  pertaining to the
     accounting,  asset/liability  management,  audit,  credit, human resources,
     treasury and legal functions,  and (ii) at the reasonabl request of Buyers,
     conform  Seller's  existing  policies  and  procedures  in  respect of such
     matters  to  Buyers'  policies  and  procedures  or, in the  absence of any
     existing Seller policy or procedure regarding any such function,  introduce
     Buyers'  policies or procedures in respect  thereof,  unless to do so would
     cause  Seller or any of the Seller  Subsidiaries  to be in violation of any
     law, rule or regulation or requirement of any Regulatory  Authority  having
     jurisdiction over Seller and/or the Seller Subsidiary affected thereby.

     5.10 Employee Agreements and Benefits. 

          (a)  Following the  Effective  Time,  Buyers shall cause the Surviving
     Corporation  to  honor in  accordance  with  their  terms  all  employment,
     severance and other  compensation  contracts set forth on Schedule  2.11(b)
     between Seller, any of the Seller  Subsidiaries,  and any current or former
     director, officer, employee or agent thereof, and all provisions for vested
     benefits or other vested  amounts  earned or accrued  through the Effective
     Time under the Seller Employee Plans.

          (b) Subject to Section 5.15,  the provisions of the Seller Stock Plans
     and any other plan,  program or  arrangement  providing for the issuance or
     grant of any other  interest in respect of the Equity  Securities of Seller
     or any of the Seller Subsidiaries shall be deleted and terminated as of the
     Effective Time.

          (c) Except as set forth in Section 5.10(b) hereof, the Seller Employee
     Plans shall not be  terminated  by reason of the Merger but shall  continue
     thereafter  as plans of the  Surviving  Corporation  until such time as the
     employees  of  Seller  and the  Seller  Subsidiaries  are  integrated  into
     Mercantile's  employee  benefit plans that are available to other employees
     of Mercantile  and its  Subsidiaries,  subject to the terms and  conditions
     specified in such plans and to such changes  therein as may be necessary to
     reflect the consummation of the Merger. Mercantile shall take such steps as
     are  necessary  or required to  integrate  the  employees of Seller and the
     Seller  Subsidiaries into Mercantile's  employee benefit plans available to
     other  employees of Mercantile and its  Subsidiaries as soon as practicable
     after the  Effective  Time,  with (i) full  credit for prior  service  with
     Seller or any of the  Seller  Subsidiaries  for  purposes  of  vesting  and
     eligibility  for  participation  and  benefit  allocation  (but not benefit
     accruals under any defined benefit plan),  and co-payments and deductibles,
     (ii)  waiver  of  all  waiting   periods,   evidence  of  insurability  and
     pre-existing  condition exclusions or penalties,  and (iii) full credit for
     claims  arising  prior to the Effective  Time for purposes of  deductibles,
     out-of-pocket maximums,  benefit maximums and all other similar limitations
     for the applicable plan year in which the Merger is consummated.

                                       39
<PAGE>
     5.11 Press  Releases.  Except to the extent  disclosure  may be required by
applicable  law,  Seller and the Buyers shall  consult with each other as to the
form and  substance  of any  proposed  press  release or other  proposed  public
disclosure  of matters  related  to this  Agreement  or any of the  transactions
contemplated hereby.

     5.12 State  Takeover  Statutes.  Seller  will take all steps  necessary  to
exempt  the  transactions  contemplated  by this  Agreement  and  any  agreement
contemplated  hereby  from,  and if  necessary  challenge  the  validity of, any
applicable state takeover law.

     5.13 Directors' and Officers'  Indemnification.  Mercantile agrees that the
Merger  shall not  affect or  diminish  any of the  duties  and  obligations  of
indemnification of Seller or any of the Seller  Subsidiaries  existing as of the
Effective Time in favor of employees, agents, directors or officers of Seller or
any  of  the  Seller   Subsidiaries   arising  by  virtue  of  its  Articles  of
Incorporation,  Charter  or  By-Laws  in the form in  effect at the date of this
Agreement or arising by  operation of law or arising by virtue of any  contract,
resolution  or  other  agreement  or  document  existing  at the  date  of  this
Agreement,  and Mercantile  shall  continue such duties and  obligations in full
force  and  effect  for so long as they  would  (but for the  Merger)  otherwise
survive  and  continue in full force and  effect.  To the extent  that  Seller's
existing  directors'  and  officers'  liability  insurance  policy would provide
coverage  for any action or  omission  occurring  prior to the  Effective  Time,
Seller agrees to give proper  notice to the insurance  carrier and to Mercantile
of any  potential  claim  thereunder so as to preserve  Seller's  rights to such
insurance  coverage.  Mercantile  represents  that the  directors' and officers'
liability  insurance  policy  maintained  by it provides  for coverage of "prior
acts" for  directors and officers of entities  acquired by Mercantile  including
Seller and the Seller  Subsidiaries on and after the Effective  Time.  After the
Effective Time, Mercantile will provide, or cause to be provided,  such coverage
to the  officers  and  directors  of Seller to the same  extent as  provided  to
officer and directors of Mercantile's other Subsidiaries.

     5.14 Tax Opinion  Certificates.  Seller  shall cause such of its  executive
officers and  directors  as may be  reasonably  requested by Thompson  Coburn to
timely execute and deliver to Thompson Coburn a certificate substantially in the
form of Exhibit B hereto.

     5.15 Employee Stock Options.

          (a) At the  Effective  Time,  all rights with respect to Seller Common
     Stock  pursuant  to  Seller  Stock  Options  that  are  outstanding  at the
     Effective Time,  whether or not then  exercisable,  shall be converted into
     and become rights with respect to Mercantile  Common Stock,  and Mercantile
     shall assume all Seller Stock Options in  accordance  with the terms of the
     Seller  Stock Plan under  which it was issued and the Seller  Stock  Option
     Agreement by which it is evidenced.  From and after the Effective Time, (i)
     each Seller Stock Option  assumed by Mercantile  shall be exercised  solely
     for  shares  of  Mercantile  Common  Stock,  (ii) the  number  of shares of
     Mercantile  Common Stock subject to each Seller Stock Option shall be equal
     to the number of shares of Seller Common Stock subject to such Seller Stock
     Option  immediately  prior to the Effective Time multiplied by the Exchange
     Ratio and (iii) the per share exercise price under each Seller Stock Option
     shall be adjuste by dividing the per share exercise price under such Seller
     Stock Option by the Exchange  Ratio and rounding  down to the nearest cent;
     provided,  however,  that the terms of each Seller Stock Option  shall,  in
     accordance with its terms, be subject to further  adjustment as appropriate
     to reflect  any stock  split,  stock  dividend,  recapitalization  or other
     similar  transaction  subsequent to the Effective Time. It is intended that
     the  foregoing  assumption  shall be undertaken in a manner that will d not
     constitute a "modification"  as defined in the Code, as to any Seller Stock
     Option that is an "incentive stock option" as defined under the Code.

          (b) The shares of Mercantile  Common Stock covered by the Seller Stock
     Options shall be covered by an effective  registration  statement  filed on
     Form S-8 with the SEC and shall be duly  authorized,  validly issued and in
     compliance with all applicable  federal and state  securities  laws,  fully
     paid and nonassessable and not subject to or in violation of any preemptive

                                       40
<PAGE>

     rights.  Mercantile shall maintain the  effectiveness of such  registration
     statement (and maintain current status of the prospectus contained therein)
     for as long as such options  remain  outstanding.  Mercantile  shall at and
     after the  Effective  Time have  reserved  sufficient  shares of Mercantile
     Common Stock for issuance  with respect to such options.  Mercantile  shall
     also take any action  required to be taken under any applicable  state blue
     sky or securities laws in connection with the issuance of such shares.

     5.16  Best  Efforts  to  Insure  Pooling.  Each of  Mercantile  and  Seller
undertakes and agrees to use its best efforts to cause the Merger to qualify for
pooling-of-interests accounting treatment. 

                                  ARTICLE VI
                                  ----------
                                  
                                  CONDITIONS

     6.01  Conditions  to Each  Party's  Obligation  To Effect the  Merger.  The
respective  obligations  of each party to effect the Merger  shall be subject to
the  fulfillment  or waiver at or prior to the  Effective  Time of the following
conditions:

          (a)  Shareholder  Approval.  The  approval of this  Agreement  and the
     Merger shall have received the requisite vote of  shareholders of Seller at
     the special meeting of shareholders called pursuant to Section 5.03 hereof.

          (b)  Regulatory   Approval.   This  Agreement  and  the   transactions
     contemplated  hereby shall have been approved by the Federal  Reserve Board
     and any other federal  and/or state  regulatory  agencies whose approval is
     required for consummation of the transactions  contemplated  hereby and all
     requisite  waiting periods  imposed by the foregoing shall have expired.

          (c)   Effectiveness  of  Registration   Statement.   The  Registration
     Statement shall have been declared  effective and shall not be subject to a
     stop order or any threatened stop order.

          (d) No Judicial Prohibition. Neither Seller, Mercantile nor Merger Sub
     shall be subject to any order, decree or injunction of a court or agency of
     competent  jurisdiction  which enjoins or prohibits the consummation of the
     Merger.

          (e) Tax Opinion.  Each of Buyers and Seller shall have  received  from
     Thompson  Coburn an opinion (which opinion shall not have been withdrawn at
     or  prior  to the  Effective  Time)  reasonably  satisfactory  in form  and
     substance  to  it  to  the  effect  that  the  Merger  will   constitute  a
     reorganization  within the meaning of Section  368 of the Code,  and to the
     effect that,  as a result of the Merger,  except with respect to fractional
     share  interests  and assuming  that such Seller  Common Stock is a capital
     asset in the hands of the holder thereof at the Effective Time, (i) holders
     of Seller  Common Stock who receive  Mercantile  Common Stock in the Merger
     will not  recognize  gain or loss for  federal  income tax  purposes on the
     receipt of such stock,  (ii) the basis of such Mercantile Common Stock will
     equal the basis of the Seller Common Stock for which it is  exchanged,  and
     (iii) and the holding period of such  Mercantile  Common Stock will include
     the holding period of the Seller Common Stock for which it is exchanged.

     6.02  Conditions to  Obligations  of Seller.  The  obligations of Seller to
effect the Merger shall be subject to the  fulfillment  or waiver at or prior to
the Effective Time of the following additional conditions:

          (a) Representations and Warranties. The representations and warranties
     of Buyers  set forth in  Article  III of this  Agreement  shall be true and
     correct in all material respects as of the date of this Agreement and as of
     the Effective Time (as though made on and as of the Effective Time,  except
     (i) to the extent such  representations and warranties are by their express
     provisions  made as of a  specified  date or  period,  (ii) where the facts
     which  caused the failure of any  representation  or warranty to be so true

                                       41
<PAGE>
     and correct have not resulted,  and are not likely to result, in a Material
     Adverse Effect on Mercantile and its  Subsidiaries,  taken as a whole,  and
     (iii) for the effect of transactions  contemplated by this Agreement),  and
     Seller shall have received a certificate of any Executive Vice President of
     Mercantile,  signing solely in his capacity as an officer of Mercantile, to
     such effect.

          (b)  Performance  of  Obligations.  Buyers shall have performed in all
     material respects all obligations required to be performed by it under this
     Agreement  prior to the  Effective  Time,  and Seller shall have received a
     certificate of any Executive  Vice President of Mercantile,  signing solely
     in his capacity as an officer of Mercantile, to that effect.

          (c) Permits,  Authorizations,  etc. Buyers shall have obtained any and
     all  material  permits,  authorizations,  consents,  waivers and  approvals
     required for the lawful consummation of the Merger.

          (d) No  Material  Adverse  Effect.  Since the date of this  Agreement,
     there  shall have been no Material  Adverse  Effect on  Mercantile  and its
     Subsidiaries, taken as a whole.

          (e) Opinion of Counsel.  Mercantile  shall have delivered to Seller an
     opinion of Mercantile's  counsel dated as of the Closing Date or a mutually
     agreeable  earlier date in substantially the form set forth as Exhibit C to
     this Agreement.

     6.03 Conditions to Obligations of the Buyers. The obligations of the Buyers
to effect the Merger  shall be  subject  to the  fulfillment  at or prior to the
Effective Time of the following additional conditions:


          (a) Representations and Warranties. The representations and warranties
     of  Seller  set forth in  Article  II of this  Agreement  shall be true and
     correct in all material respects as of the date of this Agreement and as of
     the Effective Time (as though made on and as of the Effective Time,  except
     (i) to the extent such  representations and warranties are by their express
     provisions made as of a specific date or period, (ii) where the facts which
     caused the  failure of any  representation  or  warranty  to be so true and
     correct  have not  resulted,  and are not likely to  result,  in a Material
     Adverse Effect on Seller and its Subsidiaries,  taken as a whole, and (iii)
     for the effect of  transactions  contemplated by this Agreement) and Buyers
     shall have received a certificate of the Chief Executive  Officer and Chief
     Financial Officer of Seller, signing solely in their capacities as officers
     of Seller, to such effect.

          (b)  Performance  of  Obligations.  Seller shall have performed in all
     material respects all obligations required to be performed by it under this
     Agreement  prior to the  Effective  Time,  and Buyers shall have received a
     certificate of the Chief  Executive  Officer and Chief  Financial  Officer,
     signing solely in their capacities as officers of Seller, to that effect.

          (c) Permits,  Authorizations,  etc. Seller shall have obtained any and
     all  material  permits,  authorizations,  consents,  waivers and  approvals
     required for the lawful consummation by it of the Merger.

          (d) No  Material  Adverse  Effect.  Since the date of this  Agreement,
     there shall have been no Material  Adverse  Effect on Seller and the Seller
     Subsidiaries, taken as a whole. 

          (e)  Opinion of  Counsel.  Seller  shall have  delivered  to Buyers an
     opinion of  Seller's  counsel  dated as of the  Closing  Date or a mutually
     agreeable  earlier date in substantially the form set forth as Exhibit D to
     this Agreement.

          (f)  Pooling  Letter.  The  Buyers  shall  have  received  as  soon as
     practicable  after the date of this Agreement a letter of KPMG Peat Marwick
     LLP,  reasonably  satisfactory in form and substance to the Buyers,  to the
     effect that the Merger will  qualify  for  pooling-of-interests  accounting
     treatment, which letter shall have not been withdrawn. 

                                       42
<PAGE>
                                   ARTICLE VII
                                   -----------
                        TERMINATION, AMENDMENT AND WAIVER

     7.01 Termination. This Agreement may be terminated at any time prior to the
Closing Date, whether before or after approval by the shareholders of Seller:

          (a) by  mutual  consent  by the  Executive  Committee  of the Board of
     Directors of Mercantile and by the Board of Directors of Seller;

          (b) by the Executive Committee of the Board of Directors of Mercantile
     or the Board of  Directors  of Seller at any time  after May 1, 1999 if the
     Merger  shall not  theretofore  have been  consummated  (provided  that the
     terminating  party is not then in  material  breach of any  representation,
     warranty, covenant or other agreement contained herein);

          (c) by the Executive Committee of the Board of Directors of Mercantile
     or the Board of Directors of Seller if (i) the Federal Reserve Board or any
     other federal and/or state regulatory agency whose approval is required for
     the  consummation  of  the  transactions  contemplated  hereby  has  denied
     approval of the Merger and such denial has become  final and  nonappealable
     or (ii) the  shareholders  of Seller shall not have approved this Agreement
     at the meeting referred to in Section 5.03;

          (d)  by  the  Executive   Committee  of  the  Board  of  Directors  of
     Mercantile, on the one hand, or by the Board of Directors of Seller, on the
     other hand, in the event of a material volitional breach by the other party
     to this Agreement of any  representation,  warranty,  covenant or agreement
     contained  herein,  which breach is not cured within 30 days after  written
     notice thereof is given to the breaching party by the  non-breaching  party
     or is not waived by the non-breaching party during such period; or

          (e) by the Executive Committee of the Board of Directors of Mercantile
     pursuant to and in accordance with the provisions of Section 5.06 hereof.

     7.02 Effect of  Termination.  In the event of termination of this Agreement
as provided in Section 7.01 above,  this Agreement shall  forthwith  become void
and  there  shall be no  liability  on the part of  Buyers  or  Seller  or their
respective  officers or directors  except as set forth in the second sentence of
Section 5.01 and in Sections 5.08 and 8.02,  and except that no  termination  of
this Agreement  pursuant to Section 7.01(d) shall relieve the breaching party of
any liability to the non- breaching  party hereto arising from the  intentional,
deliberate  or  willful  breach of any  representation,  warranty,  covenant  or
agreement  contained herein,  after giving notice to such breaching party and an
opportunity to cure as set forth in Section 7.01(d).

     7.03 Amendment.  This Agreement,  the Exhibits and the Schedules hereto may
be  amended  by the  parties  hereto,  by  action  taken by or on  behalf of the
Executive  Committee of the Board of Directors of Mercantile  and the respective
Boards  of  Directors  of  Merger  Sub or  Seller,  at any time  before or after
approval of this Agreement by the  shareholders  of Seller;  provided,  however,
that after any such approval by the shareholders of Seller no such  modification
shall (A)  alter or change  the  amount  or kind of Merger  Consideration  to be
received by holders of Seller Common Stock as provided in this  Agreement or (B)
adversely affect the tax treatment to holders of Seller Common Stock as a result
of the receipt of the Merger Consideration. This Agreement, the Exhibits and the
Schedules hereto may not be amended except by an instrument in writing signed on
behalf of each of Buyers and Seller.

     7.04 Waiver.  Any term,  condition or  provision of this  Agreement  may be
waived in writing at any time by the party  which is, or whose  shareholders  or
stockholders, as the case may be, are, entitled to the benefits thereof.

                                       43
<PAGE>
                                  ARTICLE VIII
                                  ------------
                               GENERAL PROVISIONS

     8.01  Non-Survival  of  Representations,   Warranties  and  Agreements.  No
investigation  by the parties hereto made  heretofore or hereafter  shall affect
the representations and warranties of the parties which are contained herein and
each such representation and warranty shall survive such  investigation.  Except
as set forth below in this Section 8.01,  all  representations,  warranties  and
agreements in this Agreement of Buyers and Seller or in any instrument delivered
by Buyers or Seller  pursuant  to or in  connection  with this  Agreement  shall
expire at the Effective Time or upon termination of this Agreement in accordance
with its terms.  In the event of  consummation  of the  Merger,  the  agreements
contained in or referred to in Sections 1.05-1.11, 5.02(b), 5.08, 5.10, 5.13 and
5.15 shall  survive the  Effective  Time.  In the event of  termination  of this
Agreement in accordance with its terms, the agreements  contained in or referred
to in the second sentence of Section 5.01 and Sections 5.08, 7.02 and 8.02 shall
survive such termination. 

     8.02  Indemnification.  Buyers and Seller  (hereinafter,  in such  capacity
being  referred to as the  "Indemnifying  Party")  agree to  indemnify  and hold
harmless each other and their officers,  directors and controlling persons (each
such  other  party  being   hereinafter   referred   to,   individually   and/or
collectively,  as the "Indemnified  Party") against any and all losses,  claims,
damages or liabilities,  joint or several,  to which the  Indemnified  Party may
become  subject under the Securities , Act, the Exchange Act or other federal or
state law or  regulation,  at common law or  otherwise,  insofar as such losses,
claims,  damages or  liabilities  (or  actions in  respect  thereof):  (a) arise
primarily  out of any  information  furnished  to the  Indemnified  Party by the
Indemnifying  Party and included in the  Registration  Statement  as  originally
filed or in any  amendment  therefor  and  supplement  thereof,  or in the Proxy
Statement,  or in any  amendment  therefor or supplement  thereof,  or are based
primarily upon any untrue  statement or alleged  untrue  statement of a material
fact  contained  in the  Registration  Statement as  originally  filed or in any
amendment therefor and supplement thereof, or in the Proxy Statement,  or in any
amendment therefor or supplement thereof,  and provided for inclusion thereof by
the Indemnifying Party or (b) arise primarily out of or are based primarily upon
the  omission  or alleged  omission  by the  Indemnifying  Party to state in the
Registration  Statement as  originally  filed or in any  amendment  therefor and
supplement thereof, or in the Proxy Statement,  or in any amendment therefor and
supplement  thereof,  a material fact required to be stated therein or necessary
to make the statements made therein not misleading, and agrees to reimburse each
such Indemnified Party, as incurred,  for any legal or other expenses reasonably
incurred by them in connection  with  investigating  or defending any such loss,
claim, damage, liability or action.

     8.03 No Assignment; Successors and Assigns. This Agreement shall be binding
upon and  inure to the  benefit  of the  parties  hereto  and  their  respective
successors  (including any corporation  deemed to be a successor  corporation of
any of the parties by operation of law) and assigns,  but neither this Agreement
nor any right or obligation set forth in any provision hereof may be transferred
or assigned  (except by operation of law) by any party hereto  without the prior
written consent of all other parties,  and any purported  transfer or assignment
in violation  of this  Section 8.03 shall be void and of no effect.  There shall
not be any  third  party  beneficiaries  of any  provisions  hereof  except  for
Sections  1.09,  1.10,  1.11,  5.10,  5.13,  5.15 and 8.02 which may be enforced
against  Mercantile  or  Seller,  as the case  may be,  by the  parties  therein
identified or described.

     8.04 Severability.  Nothing in this Agreement shall be construed to require
any party (or any  subsidiary of a party) to take any action or fail to take any
action  in  violation  of any  applicable  law,  rule  or  regulation.  Whenever
possible,  each provision of this Agreement  shall be interpreted in such manner
as to be effective and valid under  applicable law, but if any provision of this
Agreement  shall be held to be prohibited by or invalid  under  applicable  law,
such provision  shall be ineffective  only to the extent of such  prohibition or
invalidity, without invalidating the remaining provisions of this Agreement. 

                                       44
<PAGE>
     8.05 No Implied Waiver. No failure or delay on the part of any party hereto
to exercise  any right,  power or privilege  hereunder  or under any  instrument
executed  pursuant  hereto  shall  operate  as a waiver  nor shall any single or
partial exercise of any right,  power or privilege preclude any other or further
exercise thereof or the exercise of any other right, power or privilege.

     8.06 Headings.  Article, section, subsection and paragraph titles, captions
and  headings  herein  are  inserted  only as a matter  of  convenience  and for
reference,  and in no way define,  limit,  extend or describe  the scope of this
Agreement or the intent of any provision hereof.

     8.07 Entire Agreement. This Agreement and the Schedules and Exhibits hereto
constitute the entire agreement  between the parties with respect to the subject
matter hereof and supersede all prior negotiations, representations, warranties,
commitments, offers, letters of interest or intent, proposal letters, contracts,
writings or other agreements or understandings  with respect thereto. No waiver,
and no modification or amendment,  of any provision of this Agreement,  shall be
effective  unless  specifically  made in writing  and duly signed by all parties
thereto. 

     8.08  Counterparts.   This  Agreement  may  be  executed  in  one  or  more
counterparts,  and any party to this  Agreement  may execute  and  deliver  this
Agreement by executing and  delivering any of such  counterparts,  each of which
when executed and  delivered  shall be deemed to be an original and all of which
taken together shall constitute one and the same instrument.

     8.09 Notices.  All notices and other  communications  hereunder shall be in
writing  and  shall be  deemed  to be duly  received  (a) on the  date  given if
delivered  personally  or by cable,  telegram,  telex or facsimile or (b) on the
date  received  if  mailed by  registered  or  certified  mail  (return  receipt
requested),  to the parties at the following addresses (or at such other address
for a party as shall be specified by like notice):

                    (i) if to the Buyers:

                         Mercantile  Bancorporation  Inc. 
                         Mercantile  Tower 
                         P.O. Box 524 
                         St. Louis, MO 63166-0524 
                         Attention: John W. Rowe 
                                    Executive Vice President 
                                    Facsimile:  (314) 425-2752


                     Copy to: 

                         Jon W. Bilstrom, Esq.
                         General Counsel
                         Mercantile Bancorporation Inc.
                         Mercantile Tower
                         P.O. Box 524
                         St. Louis, MO 63166-0524
                         Facsimile: (314) 425-1386

                     and

                         Robert M. LaRose, Esq.
                         Thompson Coburn
                         One Mercantile Center
                         St. Louis, Missouri 63101
                         Facsimile: (314) 552-7000

                    (ii) if to Seller:

                         First Financial Bancorporation
                         204 East Washington Street
                         Iowa City, IA 52240
                         Attention: Robert M. Sierk
                                    President and Chief Executive Officer
                                    Facsimile: (319) 337-7299

                                       45
<PAGE>
                     Copy to:

                         Richard G. Clemens, Esq.
                         Sidley & Austin
                         One First National Plaza
                         Chicago, IL 60603
                         Facsimile:  (312) 853-7036

     8.10 Governing  Law. This Agreement  shall be governed by and controlled as
to validity,  enforcement,  interpretation,  effect and in all other respects by
the internal laws of the State of Missouri  applicable to contracts made in that
state. 

      IN WITNESS  WHEREOF,  the parties  hereto have caused this Agreement to be
signed  by  their  respective  officers  thereunto  duly  authorized  and  their
respective  corporate  seals to be  affixed  hereto,  all as of the  date  first
written above.

Attest:                                 MERCANTILE BANCORPORATION INC.


/s/  David W. Grant                     By:/s/  John W. Rowe
- ------------------------------------       ------------------------------------
David W. Grant                             John W. Rowe
                                           Executive Vice President, 
                                           Mercantile Bank National Association,
                                           Authorized Officer


Attest:                                 AMERIBANC, INC.


/s/  David W. Grant                     By:/s/  John W. Rowe
- ------------------------------------       ------------------------------------
David W. Grant                             John W. Rowe
                                           Vice President


Attest:                                 FIRST FINANCIAL BANCORPORATION


/s/  Larry D. Ward                      By:/s/  Robert M. Sierk
- ------------------------------------       ------------------------------------
Larry D. Ward                              Robert M Sierk
                                           President and Chief Executive Officer













                                       46

<PAGE>
                                    EXHIBIT A
                                    ---------

                                AFFILIATE LETTER

                             ________________, 1998

Mercantile Bancorporation Inc.
Mercantile Tower
P.O. Box 524
St. Louis, Missouri  63166-0524

Gentlemen:

     I have  been  advised  that  as of the  date  hereof  I may  be  deemed  an
"affiliate" ("Affiliate") of First Financial Bancorporation, an Iowa corporation
("Seller"),  as that term is defined for purposes of  paragraphs  (c) and (d) of
Rule 145 of the rules and regulations  (the "Rules and  Regulations")  under the
Securities  Act of 1933,  as amended (the  "Act").  Pursuant to the terms of the
Agreement and Plan of Merger among  Mercantile  Bancorporation  Inc., a Missouri
corporation   ("Mercantile"),    Ameribanc,   Inc.,   a   Missouri   corporation
("Ameribanc"),  and Seller (the "Merger Agreement"),  Seller will be merged with
and into Ameribanc (the "Merger"), and as a result of the Merger, I will receive
shares of common  stock of  Mercantile,  $0.01  par  value  ("Mercantile  Common
Stock").

     In  connection  with the above  transactions,  I  represent  and warrant to
Mercantile and agree that:

     A. I will not make any sale, transfer or other disposition of the shares of
Mercantile Common Stock in violation of the Act or the Rules and Regulations.

     B. I have no present  plan or intent to dispose  of the  Mercantile  Common
Stock acquired by me pursuant to the Merger.

     C. I have been advised that the  offering,  sale and delivery of the shares
of Mercantile Common Stock to me pursuant to the Merger will be registered under
the Act on a  Registration  Statement  on Form S-4.  I have  also been  advised,
however,  that,  since I may be deemed to be an  Affiliate of Seller at the time
the Merger Agreement is submitted for a vote of the shareholders of Seller,  the
shares of Mercantile  Common Stock must be held by me  indefinitely,  unless (i)
such shares of Mercantile  Common Stock have been  registered  for  distribution
under the Act, (ii) a sale of the shares of  Mercantile  Common Stock is made in
conformity  with the volume and other  applicable  limitations  of Rule 145,  or
(iii) in the opinion of counsel reasonably acceptable to Mercantile,  some other
exemption from registration  under the Act is available with respect to any such
proposed sale,  transfer or other disposition of the shares of Mercantile Common
Stock.

     D. I have  carefully  read this  letter and the Merger  Agreement  and have
discussed their requirements and other applicable limitations upon my ability to
sell, transfer or otherwise dispose of the shares of Mercantile Common Stock, to
the extent I felt necessary, with my counsel or counsel for Seller.

     E. I understand  that  Mercantile  is under no  obligation  to register the
sale, transfer or other disposition of the shares of Mercantile Common Stock for
sale,  transfer or other  disposition by me to make compliance with an exemption
from registration available.

     F.  Notwithstanding  the  other  provisions  hereof,  I agree  not to sell,
pledge,  transfer or otherwise dispose of, or reduce my risk relative to, shares
of Mercantile  Common Stock or shares of the common  stock,  par value $1.25 per
share,  of Seller during the period 30 days prior to consummation of the Merger,
and will not sell,  pledge,  transfer or otherwise dispose of, or reduce my risk
relative  to,  shares of  Mercantile  Common  Stock  during the period  from the
consummation  of the Merger  until such time as  financial  results  covering at

                                       47
<PAGE>
least 30 days of  combined  operations  of the  parties to the Merger  have been
published  within the meaning of Section  201.01 of the  Securities and Exchange
Commission's  Codification of Financial  Reporting  Policies.  Mercantile agrees
that it will publish such financial  results within 45 days after the end of the
first fiscal quarter of Mercantile containing the required period of post-Merger
combined operations.

     G. I  understand  that  stop  transfer  instructions  will be  given to the
registrar of the certificates for the shares of Mercantile Common Stock and that
there will be placed on the  certificates  for the shares of  Mercantile  Common
Stock, or any substitutions therefore, a legend stating in substance:

          "The  shares   represented  by  this  certificate  were  issued  in  a
          transaction  (the  acquisition of First Financial  Bancorporation)  to
          which  Rule 145  promulgated  under  the  Securities  Act of 1933,  as
          amended (the "Act"),  applies and may be sold or otherwise transferred
          only in  compliance  with the  limitations  of such Rule 145,  or upon
          receipt by  Mercantile  Bancorporation  Inc.  of an opinion of counsel
          acceptable to it that some other exemption from registration under the
          Act is available,  or pursuant to a registration  statement  under the
          Act. The shares  represented  by this  certificate  may not be sold or
          otherwise   transferred   prior  to  the   publication  by  Mercantile
          Bancorporation  Inc. of financial results covering at least 30 days of
          combined operations subsequent to [the effective date of the Merger]."

     H. I  hereby  agree  that,  for a  period  of one (1)  year  following  the
effective  date of the  Merger,  I will  obtain  an  agreement  similar  to this
agreement from each transferee of the shares of Mercantile  Common Stock sold or
otherwise transferred by me, but only if such transfer is effected other than in
a transaction  involving a registered  public  offering or as a sale pursuant to
Rule 145.

     I. Mercantile agrees, for a period of two years after the Effective Time of
the Merger,  to file on a timely  basis all  reports  required to be filed by it
pursuant to Section 13 of the  Securities  Exchange Act of 1934, as amended,  so
that the public information  provisions of Rule 145 as the same are presently in
effect will be available to me in the event that I desire to transfer any shares
of Mercantile Common Stock issued to me pursuant to the Merger.

     It is understood and agreed that this Agreement will terminate and be of no
further  force and effect and the legend set forth in  Paragraph G above will be
removed by delivery of  substitute  certificates  without such  legend,  and the
related transfer  restrictions shall be lifted forthwith,  if the period of time
specified  in  Paragraph  F of this  Agreement  has  passed and (i) my shares of
Mercantile  Common  Stock  shall  have been  registered  under the Act for sale,
transfer or other  disposition by me or on my behalf,  (ii) I am not at the time
an Affiliate of Mercantile  and have held the shares of Mercantile  Common Stock
for at least one (1) year (or such other period as may be  prescribed by the Act
and the Rules and  Regulations) and Mercantile has filed with the Securities and
Exchange  Commission ("SEC") all of the reports it is required to file under the
Securities  Exchange Act of 1934, as amended,  during the preceding  twelve (12)
months,  (iii) I am not and  have not been for at  least  three  (3)  months  an
Affiliate of Mercantile  and I have held the shares of  Mercantile  Common Stock
for at least two (2) years,  (iv)  Mercantile  shall have received a letter from
the staff of the SEC,  or an opinion of  Mercantile's  General  Counsel or other
counsel  acceptable  to  Mercantile,  to the  effect  that  the  stock  transfer
restrictions  and the legend are not required,  or (v) if the provisions of Rule
145 are amended to  eliminate  all  restrictions  applicable  to the  Mercantile
Common Stock received by me pursuant to the Merger.

     This  Agreement  shall be binding on my heirs,  legal  representatives  and
successors.
                                            Very truly yours,

                                            __________________________________

Accepted as of the _______ day of ________________, 1998.

MERCANTILE BANCORPORATION INC.

By:__________________________________

                                       48

<PAGE>




                                    EXHIBIT B
                                    ---------

                          DIRECTOR/OFFICER CERTIFICATE




































                                       49

<PAGE>

______________, 1998

Page 1
                                    EXHIBIT C
                                    ---------
                        LEGAL OPINION OF BUYERS' COUNSEL

                              ______________, 1998

First Financial Bancorporation
204 East Washington Street
Iowa City, IA  52240

     Re: Mercantile Bancorporation Inc.

Ladies and Gentlemen:

     We have acted as  counsel to  MERCANTILE  BANCORPORATION  INC.,  a Missouri
corporation  ("Mercantile"),  and AMERIBANC,  INC., a Missouri  corporation  and
wholly owned  subsidiary of Mercantile  ("Merger  Sub"),  in connection with the
acquisition (the "Acquisition") by Mercantile of FIRST FINANCIAL BANCORPORATION,
an Iowa  corporation  ("Seller"),  pursuant to the Agreement and Plan of Merger,
dated as of _________, 1998 (the "Agreement"),  by and among Mercantile,  Merger
Sub and Seller. We are rendering this opinion to you pursuant to Section 6.02(e)
of the Agreement.

     In rendering the opinions set forth herein,  we have examined  originals or
copies of such corporate records of Mercantile and Merger Sub, such laws and the
originals or copies of such other records, agreements, instruments, certificates
and  documents  as  we  have  deemed  necessary  as a  basis  for  the  opinions
hereinafter  expressed.  We have assumed the genuineness of all signatures;  the
authenticity  of all documents  submitted to us as originals;  the conformity to
the  originals of all  document  submitted to us as  certified,  photostatic  or
conformed  copies;  the  authenticity  of  the  originals  of  all  such  latter
documents;  and the correctness of certificates  submitted to us by officers and
representatives  of Mercantile and Merger Sub. In addition,  with respect to the
opinions as to the due execution and binding  nature of the  Agreement,  we have
assumed the due execution and delivery of such agreements by all parties thereto
other than  Mercantile and Merger Sub. In rendering our opinion,  we have relied
upon  certificates  of  corporate  officers of  Mercantile  and Merger Sub as to
certain  factual  matters  material to such opinion,  and upon  certificates  of
public  officials,  all of  which  certificates  have  been  furnished  or  made
available to you.  Capitalized  terms not defined  herein shall be defined as in
the Agreement.  Whenever our opinion with respect to the existence or absence of
facts is  indicated  to be based upon our  knowledge,  we are  referring  to the
actual   knowledge  of  the  Thompson  Coburn  attorneys  who  have  represented
Mercantile  and  Merger  Sub in matters  that are the  subject of this  opinion.
Except to the extent  expressly set forth  herein,  we have not  undertaken  any
independent  investigation  to determine  the existence or absence of such facts
and no inference as to our  knowledge of the  existence or absence of such facts
should be drawn from our representation of Mercantile.

     Based upon and subject to the foregoing, we are of the opinion that:

     (a) Mercantile and Merger Sub are each corporations duly organized, validly
existing and in good standing under the laws of the State of Missouri,  are each
duly qualified to do business and are each in good standing in all jurisdictions
where the ownership or leasing of their respective  properties or the conduct of
their respective  businesses  require  Mercantile or Merger Sub, as the case may
be, to be so qualified.  Mercantile  and Merger Sub are each  registered as bank
holding  companies  with the Board of  Governors of the Federal  Reserve  System
under the Bank Holding Company Act of 1956, as amended.

                                       50
<PAGE>
     (b)  Mercantile  and  Merger Sub  possess  all  corporate  power to own and
operate their respective properties and to carry out their respective businesses
as and where the same are now being conducted.

     (c) Mercantile  and Merger Sub each have the corporate  power and authority
to enter  into and  deliver  the  Agreement  and to carry out  their  respective
obligations thereunder.

     (d) The  Agreement  has been duly  authorized  by all  necessary  corporate
action of the Board of Directors (or a duly  authorized  committee of the Board)
of Mercantile and Merger Sub,  respectively,  and such  Agreement  constitutes a
valid and binding  obligation of Mercantile  and Merger Sub that is  enforceable
against  Mercantile  and Merger Sub, as the case may be, in accordance  with its
terms,  except  as  may  be  limited  by  bankruptcy,   insolvency,  moratorium,
reorganization or similar laws affecting the rights of creditors  generally,  or
the  exercise of judicial  discretion  in  accordance  with  general  principles
applicable to equitable and similar remedies.

     (e) The execution, delivery and performance by Mercantile and Merger Sub of
the  Agreement,  or  the  consummation  of the  Acquisition,  or  compliance  by
Mercantile or Merger Sub with any of the  provisions  of the Agreement  will not
(i) violate, conflict with or result in a breach of any of the provisions of, or
constitute a default (or event which, with notice or the lapse of time, or both,
would constitute a default) under, or result in the termination of, or result in
the right to termination or  acceleration  of, or result in the creation of, any
lien,  security  interest,  charge  or  encumbrance  upon any of the  respective
properties  of  Mercantile  or Merger Sub under any of the terms,  conditions or
provisions  of (A) the  respective  Articles  of  Incorporation  or  By-laws  of
Mercantile or Merger Sub, or (B) any note, bond,  mortgage,  indenture,  deed of
trust,  license,  lease,  agreement or other  instrument  or obligation to which
Mercantile or Merger Sub or any of their respective  properties or assets may be
subject,  or (ii) to the best of our  knowledge,  violate any judgment,  ruling,
order,  writ,  injunction,  decree,  statute,  rule or regulation  applicable to
Mercantile or Merger Sub, or any of their respective properties or assets; other
than violations,  conflicts, breaches, defaults, terminations,  accelerations or
Liens  which  would not have a Material  Adverse  Effect on  Mercantile  and its
Subsidiaries, taken as a whole.

     (f) Except as received prior to the date hereof, no notice to, filing with,
exemption or review by or authorization, consent or approval of, any public body
or authority is necessary  for the  consummation  by Mercantile or Merger Sub of
the  Acquisition as  contemplated  by the  Agreement,  other than the filing and
approval,  as the case may be, of  certificates  of merger by the Secretaries of
State of the States of Missouri and Iowa.

     (g) To the best of our  knowledge,  the  authorized  and issued  capital of
Mercantile  consists of (i)  400,000,000  shares,  $0.01 par value of Mercantile
common stock ("Mercantile  Common Stock"),  of which, as of [the last day of the
most  recently  ended  fiscal  quarter],  ____________  shares  were  issued and
____________  shares were  outstanding,  and (ii) 5,000,000  shares of preferred
stock,  no par value  ("Mercantile  Preferred  Stock"),  of which no shares were
issued  and  outstanding.   Mercantil  has  designated   [4,000,000]  shares  of
Mercantile Preferred Stock as "[Series B] Junior Participating  Preferred Stock"
and has reserved such shares under a Rights Agreement dated May __, 1998 between
Mercantile  and Mercantile  Bank National  Association,  as rights agent.  As of
____________,   1998,  Mercantile  had  reserved  (i)  _____________  shares  of
Mercantile  Common  Stock for  issuance  under the  Mercantile  stock option and
incentive plans; and (ii) [pending acquisitions].  To the best of our knowledge,
from [last day of last  quarterly  period]  through the date  hereof,  no Equity
Securities  of Mercantile  have been issued,  excluding any shares of Mercantile
Common  Stock which may have been issued (i) under the  Mercantile  stock option
and  incentive   plans  or  (ii)  upon   consummation   of  the  acquisition  of
_____________.  To the best of our  knowledge,  and  except as set forth  above,
there  are no  options,  warrants,  scrip,  rights  to  subscribe  to,  calls or
commitments  of any  character  whatsoever  relating to, or securities or rights
convertible  into,  shares of any capital  stock of  Mercantile,  or  contracts,
commitments, understandings or arrangements by which Mercantile is or may become
bound to issue  additional  shares of capital  stock,  or  options,  warrants or
rights  to  purchase  or  acquire  any  additional  shares of  capital  stock of
Mercantile.  To the best of our  knowledge,  all of the issued  and  outstanding

                                       51
<PAGE>
shares  of  Mercantile   Common  Stock  are  validly  issued,   fully  paid  and
nonassessable  by  Mercantile  and  none of such  shares  have  been  issued  in
violation of any  preemptive or similar right of any  shareholder of Mercantile.
The shares of Mercantile  Common Stock issued  pursuant to the Merger  Agreement
are duly authorized, validly issued, fully paid and nonassessable by Mercantile,
and none of such shares are subject to preemptive or other similar rights.

     (h) To the best of our knowledge,  neither Mercantile nor Merger Sub is the
subject of any order,  decree or  injunction  of a court or agency of  competent
jurisdiction that enjoins or prohibits the consummation of the Acquisition.

     (i) There is no litigation,  proceeding or controversy  before any court or
governmental agency, whether federal, state or local, pending or, to the best of
our knowledge,  threatened,  that is likely to have a Material Adverse Effect on
Mercantile and its Subsidiaries, taken as a whole.

     The opinions  expressed herein by the undersigned are expressly  limited to
the laws of the State of  Missouri  and of the United  States of America and the
corporate  laws of the  State of Iowa.  We assume  no  responsibility  as to the
applicability  or the  effect  of the  laws of any  other  domestic  or  foreign
jurisdiction on the subject transactions.

     This  opinion is being  rendered  solely for the benefit of the  addressees
hereof  and is not to be used or relied  upon by any other  person  without  our
prior written consent. We expressly disavow any obligation to update this letter
in the future.

                                                 Very truly yours,















                                       52

<PAGE>

______________, 1998

Page 1
                                    EXHIBIT D
                                    ---------

                        LEGAL OPINION OF SELLER'S COUNSEL

                              _______________, 1998

Mercantile Bancorporation Inc.
One Mercantile Center
St. Louis, Missouri 63101

     Re: First Financial Bancorporation

Ladies and Gentlemen:

     We have  acted  as  counsel  to  FIRST  FINANCIAL  BANCORPORATION,  an Iowa
corporation  ("Seller"),  in connection with the acquisition (the "Acquisition")
by MERCANTILE  BANCORPORATION  INC., a Missouri corporation  ("Mercantile"),  of
Seller pursuant to the Agreement and Plan of Merger, dated as of _________, 1998
(the  "Agreement"),  by  and  among  Mercantile,  AMERIBANC,  INC.,  a  Missouri
corporation  and wholly owned  subsidiary  of  Mercantile  ("Merger  Sub"),  and
Seller.  We are rendering this opinion to you pursuant to Section 6.03(e) of the
Agreement.

     In rendering the opinions set forth herein,  we have examined  originals or
copies of such  corporate  records of Seller  and First  National  Bank Iowa,  a
national banking association and a subsidiary of Seller ("Bank"),  such laws and
the  originals  or  copies  of  such  other  records,  agreements,  instruments,
certificates  and  documents  as we have  deemed  necessary  as a basis  for the
opinions  hereinafter  expressed.   We  have  assumed  the  genuineness  of  all
signatures;  the legal capacity of all natural persons;  the authenticity of all
documents  submitted to us as originals;  the conformity to the originals of all
documents  submitted to us as certified,  photostatic or conformed  copies;  the
authenticity  of the originals of all such  documents;  and the  correctness  of
certificates  submitted to us by officers and  representatives of Seller and the
Bank.  In addition,  with respect to the  opinions as to the due  execution  and
binding nature of the Agreement,  we have assumed the due execution and delivery
of the  Agreement by all parties  thereto other than Seller.  In rendering  such
opinions,  we have relied upon the above-described  certificates,  as to factual
matters material to such opinions,  and upon  certificates of public  officials,
all of  which  certificates  have  been  furnished  or  made  available  to you.
Capitalized  terms  not  defined  herein  have  the  meanings  specified  in the
Agreement.  Whenever  our opinion  with  respect to the  existence or absence of
facts is indicated to be based on our knowledge,  we are referring to the actual
conscious knowledge of the Sidley & Austin attorneys who have represented Seller
in the  matters  that are the  subject  of this  letter.  Except  to the  extent
expressly set forth herein, we have not undertaken any independent investigation
to determine  the  existence or absence of such facts and no inference as to our
knowledge  of the  existence  or absence of such facts  should be drawn from our
representation of Seller or the Bank, or any of their respective subsidiaries.

     Based upon and subject to the foregoing, we are of the opinion that:

     (a) Seller is a corporation  duly organized,  validly  existing and in good
standing  under the laws of the State of Iowa.  Seller is  registered  as a bank
holding  company with the Board of Governors of the Federal  Reserve System (the
"Federal Reserve Board") under the Bank Holding Company Act of 1956, as amended.

     (b) The Bank is a national banking  association duly incorporated,  validly
existing and in good standing under the laws of the United States of America.

                                       53
<PAGE>
     (c) Seller and each of the  Seller's  Subsidiaries  possess  all  necessary
corporate power to own and operate their  respective  properties and to carry on
their respective  businesses as and where the same are now being conducted,  all
as described in Seller's most recent 10-K filed with the Securities and Exchange
Commission.

     (d) Seller has the  necessary  corporate  power and authority to enter into
and deliver the Agreement and to carry out its obligations thereunder.

     (e) The  Agreement  has been duly  authorized  by all  necessary  corporate
action  of the Board of  Directors  and the  shareholders  of  Seller,  and such
Agreement  constitutes  a  valid  and  binding  obligation  of  Seller  that  is
enforceable  against  Seller  in  accordance  with its  terms,  except as may be
limited  by  bankruptcy,  insolvency,  moratorium,  reorganization,   fraudulent
transfer or similar laws  affecting  the rights of creditors  generally,  or the
exercise of judicial discretion in accordance with general principles applicable
to equitable and similar remedies.

     (f) To our knowledge,  neither the execution,  delivery and  performance by
Seller of the Agreement nor the consummation of the Acquisition or compliance by
Seller or any Seller Subsidiary with any of the provisions of the Agreement will
(i) violate or result in a breach of any of the  provisions  of, or constitute a
default  (or event  which,  with  notice or the  lapse of time,  or both,  would
constitute a default)  under,  or result in the termination of, or result in the
right of termination or acceleration  of, or result in the creation of any lien,
security interest,  charge or encumbrance upon any of the respective  properties
of  Seller  or any  Seller  Subsidiary  under any of the  terms,  conditions  or
provisions of (A) the Articles or Certificate of Incorporation,  as the case may
be, or  By-Laws  of  Seller or any  Seller  Subsidiary,  or (B) any note,  bond,
mortgage,   indenture,  deed  of  trust,  license,  lease,  agreement  or  other
instrument or obligation to which Seller or any Seller Subsidiary or any o their
respective  properties  or assets may be subject,  or (ii) violate any judgment,
ruling,  order,  writ,  injunction  or decree in which the  Seller or any Seller
Subsidiary is named or to which any of them is a party, or any statute,  rule or
regulation  applicable  to  Seller  or any  Seller  Subsidiary  or any of  their
respective  properties or assets;  other than violations,  conflicts,  breaches,
defaults,  terminations,  accelerations or Liens which would not have a Material
Adverse Effect on Seller and its Subsidiaries, taken as a whole.

     (g) Except as received prior to the date hereof, no notice to, filing with,
exemption or review by or authorization,  consent or approval of any public body
or authority is necessary for the  consummation  by Seller of the Acquisition as
contemplated by the Agreement,  other than the filing and approval,  as the case
may be, of  certificates  of merger by the  Secretary  of State of the States of
Missouri and Iowa.

     (h) The authorized  capital stock of Seller  consists of: (i)  [15,000,000]
shares of common  stock  ("Seller  Common  Stock");  and nothing has come to our
attention that causes us to believe that, as of the date hereof,  Seller did not
have ________ shares of Seller Common Stock issued and outstanding.  Nothing has
come to our  attention  that causes us to believe  that,  as of the date hereof,
options to purchase  ________  shares of Seller  Common Stock under Seller stock
option and incentive plans were not outstanding.  Other than as described above,
to our knowledge, there are no options, warrants, scrip, rights to subscribe to,
calls or commitments of any character  whatsoever  relating to, or securities or
rights  convertible  into,  shares of any capital stock of Seller, or contracts,
commitments,  understandings  or  arrangements  by which Seller is or may become
bound to issue  additional  shares  of  capital  stock of  Seller,  or  options,
warrants or rights to purchase or acquire any additional  share of capital stock
of Seller.  Nothing has come to our attention that causes us to believe that all
of the  issued  and  outstanding  shares of Seller  Common  Stock  have not been
validly issued, or are not fully paid and nonassessable,  or have been issued in
violation of any preemptive or similar right of any shareholder of Seller.

                                       54
<PAGE>

     (i)  Seller is the owner of record  of all of the  issued  and  outstanding
shares of capital stock of each of the Seller  Subsidiaries.  To our  knowledge,
except as set forth  above,  there are no options,  warrants,  scrip,  rights to
subscribe to, calls or commitments of any character  whatsoever  relating to, or
securities or rights convertible into, shares of any capital stock of any of the
Seller Subsidiaries, or contracts,  commitments,  understandings or arrangements
by  which  any of the  Seller  Subsidiaries  is or may  become  bound  to  issue
additional  shares of its  capital  stock,  or  options,  warrants  or rights to
purchase or acquire additional shares of its capital stock.  Nothing has come to
our  attention  that cause us to believe that all of the issued and  outstanding
shares of capital stock of each of the Seller Subsidiaries have not been validly
issued,  or are not  fully  paid  and  nonassessable,  or have  been  issued  in
violation of any preemptive or similar right of any shareholder of such entity.

     (j) To our  knowledge,  neither  Seller  nor any Seller  Subsidiary  is the
subject of any order,  decree or  injunction  of a court or agency of  competent
jurisdiction which enjoins or prohibits the consummation of the Acquisition.

     This  opinion  is  limited  to the laws of the  State of  Illinois  and the
federal laws of the United States of America.  Seller is incorporated  under the
laws of Iowa.  The  Agreement  provides that it is to be governed by the laws of
the State of Missouri.  Notwithstanding such factors, we have assumed, with your
approval,  that the laws of the States of Iowa and  Missouri are the same as the
laws of the State of Illinois in all respects relevant to our opinions set forth
herein. Your counsel has acknowledged to us, on your behalf, that you understand
that there may be substantial differences between the laws of the States of Iowa
and Missouri and the laws of the State of Illinois, and that no assurance can be
given that the laws of the State of  Illinois  would be applied in  interpreting
and enforcing the Agreement by any court,  including a court located  within the
State of Illinois or that the Illinois  Business  Corporation  Act is similar to
the Iowa Business Corporation Act.  Accordingly,  we express no opinion and make
no  representation  as to  the  appropriateness  of  such  assumption  for  your
purposes.

     This  opinion is being  rendered  solely for the  benefit of the  addressee
hereof  and is not to be used or relied  upon by any other  person  without  our
prior written consent. We expressly disavow any obligation to update this letter
in the future.

                                                Very truly yours,

                                                        

                                      55

<PAGE>
                                   EXHIBIT 2.2

                            STOCK OPTION AGREEMENT
                             ----------------------

     STOCK OPTION AGREEMENT ("Option Agreement") dated as of May 7, 1998, by and
between  MERCANTILE   BANCORPORATION  INC.  ("Buyer"),  a  Missouri  corporation
registered as a bank holding company under the Bank Holding Company Act of 1956,
as amended (the  "Holding  Company  Act"),  and FIRST  FINANCIAL  BANCORPORATION
("Seller"),  an Iowa corporation  registered as a bank holding company under the
Holding Company Act.

                              W I T N E S S E T H:
                              --------------------

     WHEREAS,  Buyer and Seller are prepared to execute and deliver an Agreement
and Plan of  Merger  dated as of even date  herewith  (the  "Merger  Agreement")
providing  for the merger of Seller with and into a wholly owned  subsidiary  of
Buyer; and

     WHEREAS,  as a condition  to Buyer's  entering  into the Merger  Agreement,
Buyer has required that Seller agree,  and Seller has agreed,  to grant to Buyer
the option set forth herein to purchase  authorized  but unissued  shares of the
common stock, $1.25 par value, of Seller ("Seller Common Stock").

     NOW,  THEREFORE,  in  consideration of the premises herein  contained,  the
parties agree as follows:

     1.  Definitions.  Capitalized  terms used but not defined herein shall have
the same meanings as in the Merger Agreement.

     2. Grant of Option.  Subject to the terms and  conditions set forth herein,
Seller hereby grants to Buyer an option (the "Option") to purchase up to 707,189
shares of Seller Common Stock  (representing  approximately  19.9% of the issued
and  outstanding  shares of Seller  Common  Stock) at a price per share equal to
$37.75 (the "Purchase  Price")  payable in cash as provided in Section 4 hereof.
In no event  shall  shares of  Seller  Common  Stock  for  which  the  Option is
exercisable  exceed 19.9% of the issued and outstanding  shares of Seller Common
Stock,  without giving effect to any shares subject to or issued pursuant to the
Option.

     3. Exercise of Option.

     (a) If not then in  material  breach  of the  Merger  Agreement,  Buyer may
exercise the Option,  in whole or in part, at any time or from time to time if a
Purchase Event (as defined below) shall have occurred;  provided, however, that:
(i) to the extent the Option shall not have been  exercised,  it shall terminate
and be of no  further  force and  effect  upon the  earlier  to occur of (A) the
Effective Time of the Merger and (B) the termination of the Merger  Agreement in
accordance with Article VII thereof,  provided that in the case of a termination
by Buyer  pursuant to Section  7.01(d)  arising  from the  volitional  breach by
Seller of any of its  representations,  warranties  or  covenants  in the Merger
Agreement,  the  Option  shall  not  terminate  until the date that is 12 months
following such  termination;  (ii) if the Option cannot be exercised on such day
because  of any  injunction,  order or  similar  restraint  issued by a court of
competent  jurisdiction,  the Option shall expire on the 30th business day after
such  injunction,  order or  restraint  shall have been  dissolved  or when such
injunction, order or restraint shall have become permanent and no longer subject
to appeal, as the case may be; and (iii) that any such exercise shall be subject
to compliance with applicable law, including the Holding Company Act.

                                       56
<PAGE>
     (b) As used  herein,  a "Purchase  Event"  shall mean any of the  following
events:

          (i) Seller or any of its  Subsidiaries,  without having received prior
     written   consent  from  Buyer,   shall  have  entered  into,   authorized,
     recommended,  proposed or publicly  announced  its intention to enter into,
     authorize, recommend or propose, an agreement, arrangement or understanding
     with any person (other than Buyer or any of its Subsidiaries) to (A) effect
     a merger or consolidation or similar transaction  involving the acquisition
     of Seller or any of its  Subsidiaries,  (B)  purchase,  lease or  otherwise
     acquire 15% or more of the assets of Seller or any of its  Subsidiaries  or
     (C)  purchase  or   otherwise   acquire   (including   by  way  of  merger,
     consolidation,  share exchange or similar transaction) Beneficial Ownership
     of securities representing 15% or more of the voting power of Seller or any
     of  its   Subsidiaries   (in  each  case,   other  than  any  such  merger,
     consolidation,  purchase,  lease,  share  exchange  or similar  transaction
     between or among any two or more Seller Subsidiaries);

          (ii) any person  (other  than  Buyer or any  Subsidiary  of Buyer,  or
     Seller or any  Subsidiary  of Seller in a  fiduciary  capacity)  shall have
     acquired Beneficial  Ownership or the right to acquire Beneficial Ownership
     of 15% or more of the voting power of Seller; or

          (iii) (1) the holders of Seller  Common Stock shall not have  approved
     the  Merger  Agreement  at the  meeting of such  shareholders  held for the
     purpose of voting on the Merger Agreement,  (2) such meeting shall not have
     been held,  (3) such meeting shall have been canceled  prior to termination
     of the Merger  Agreement in accordance with its terms or (4) Seller's Board
     of Directors  shall have withdrawn or modified in a manner adverse to Buyer
     the recommendation of Selle s Board of Directors with respect to the Merger
     Agreement;  in the case of each of (1),  (2),  (3) and (4) above,  after an
     Extension Event.

     (c) As used  herein,  the  term  "Extension  Event"  shall  mean any of the
following events:

          (i) a Purchase Event described in Section 3(b)(i) or (ii) hereof;

          (ii) any person  (other than Buyer or any of its  Subsidiaries)  shall
     have  "commenced" (as such term is 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  shares of
     Seller Common Stock such that, upon consummation of such offer, such person
     would have Beneficial  Ownership (as defined below) or the right to acquire
     Beneficial Ownership of 15% or more of the voting power of Seller; or

          (iii) any person  (other  than Buyer or any  Subsidiary  of Buyer,  or
     Seller or any  Subsidiary  of Seller in a  fiduciary  capacity)  shall have
     publicly  announced its  willingness,  or shall have  publicly  announced a
     proposal,  or publicly  disclosed an  intention to make a proposal,  (x) to
     make an offer  described  in  clause  (ii)  above,  or (y) to  engage  in a
     transaction described in clause (i) above.

          (d) As used herein, the terms "Beneficial Ownership" and "Beneficially
     Own"  shall have the  meanings  ascribed  to them in Rule  13d-3  under the
     Exchange Act.

          (e) In the event Buyer wishes to exercise the Option, it shall deliver
     to Seller a written  notice (the date of which being herein  referred to as
     the "Notice Date")  specifying (i) the total number of shares it intends to
     purchase  pursuant to such  exercise  and (ii) a place and date not earlier
     than ten business days nor later than 30 calendar days from the Notice Date
     for the closing of such purchase (the "Closing Date").

                                       57
<PAGE>

 4.  Payment  and  Delivery of  Certificates.  

     (a) At the  closing  referred  to in Section 3 hereof,  Buyer  shall pay to
Seller  the  aggregate  Purchase  Price for the  shares of Seller  Common  Stock
purchased pursuant to the exercise of the Option in immediately  available funds
by wire transfer to a bank account designated by Seller.

(b) At such closing,
     simultaneously  with the  delivery  of cash as  provided  in Section  4(a),
     Seller shall deliver to Buyer a certificate  or  certificates  representing
     the number of shares of Seller Common Stock purchased by Buyer,  registered
     in the name of Buyer or a nominee designated in writing by Buyer, and Buyer
     shall  deliver to Seller a letter  agreeing  that Buyer  shall not offer to
     sell, pledge or otherwise dispose of such shares in violation of applicable
     law or the  provisions  of this  Option  Agreement.  

     (c) If at the time of issuance of any Seller  Common Stock  pursuant to any
exercise of the Option,  Seller shall have issued any share  purchase  rights or
similar  securities to holders of Seller  Common Stock,  then each such share of
Seller Common Stock shall also  represent  rights with terms  substantially  the
same as and at least as favorable  to Buyer as those issued to other  holders of
Seller Common Stock.

     (d) Certificates for Seller Common Stock delivered at any closing hereunder
shall be endorsed with a restrictive  legend which shall read  substantially  as
follows:
          The transfer of the shares  represented by this certificate is subject
          to certain  provisions of an agreement  between the registered  holder
          hereof and FIRST FINANCIAL BANCORPORATION,  a copy of which is on file
          at the  principal  office of FIRST  FINANCIAL  BANCORPORATION,  and to
          resale  restrictions  arising  under the  Securities  Act of 1933,  as
          amended,  and any  applicable  state  securities  laws. A copy of such
          agreement  will be provided to the holder hereof  without  charge upon
          receipt  by  FIRST  FINANCIAL  BANCORPORATION  of  a  written  request
          therefor.

It is  understood  and agreed that the above legend shall be removed by delivery
of substitute  certificates without such legend if Buyer shall have delivered to
Seller an opinion of counsel, in form and substance  reasonably  satisfactory to
Seller and its  counsel,  to the effect  that such  legend is not  required  for
purposes of the Securities Act and any applicable state securities laws and this
Option Agreement.

5. Authorization,  etc. 

     (a) Seller hereby represents and warrants to Buyer that:

               (i) Seller has full  corporate  authority  to execute and deliver
          this Option Agreement and, subject to Section 11(i), to consummate the
          transactions contemplated hereby;

               (ii)  such  execution,   delivery  and  consummation   have  been
          authorized by the Board of Directors of Seller, and no other corporate
          proceedings are necessary therefor;

               (iii) this Option  Agreement  has been duly and validly  executed
          and delivered and represents a valid and legally binding obligation of
          Seller, enforceable against Seller in accordance with its terms; and

               (iv) Seller has taken all necessary corporate action to authorize
          and reserve and, subject to Section 11(i),  permit it to issue and, at
          all times from the date  hereof  through  the date of the  exercise in
          full or the  expiration  or  termination  of the  Option,  shall  have
          reserved for issuance upon exercise of the Option, _________ shares of
          Seller Common Stock,  all of which,  upon  issuance  pursuant  hereto,
          shall   be  duly   authorized,   validly   issued,   fully   paid  and
          nonassessable,  and shall be  delivered  free and clear of all claims,
          liens,  encumbrances,  restrictions  (other  than  federal  and  state
          securities restrictions) and security interests and not subject to any
          preemptive rights.

                                      58

<PAGE>
     (b) Buyer hereby represents and warrants to Seller that:

          (i) Buyer has full  corporate  authority  to execute and deliver  this
     Option   Agreement  and,  subject  to  Section  11(i),  to  consummate  the
     transactions contemplated hereby;
                                           

          (ii) such execution, delivery and consummation have been authorized by
     all requisite corporate action by Buyer, and no other corporate proceedings
     are necessary therefor;
                                            
          (iii) this Option  Agreement  has been duly and validly  executed  and
     delivered and represents a valid and legally  binding  obligation of Buyer,
     enforceable against Buyer in accordance with its terms; and

          (iv) any Seller  Common  Stock or other  securities  acquired by Buyer
     upon  exercise  of the  Option  will not be taken with a view to the public
     distribution  thereof and will not be transferred or otherwise  disposed of
     except in compliance with the Securities Act and applicable state law.

     6. Adjustment Upon Changes in Capitalization. In the event of any change in
Seller Common Stock by reason of stock dividends,  split-ups,  recapitalizations
or the like,  the type and  number  of shares  subject  to the  Option,  and the
Purchase Price per share,  as the case may be, shall be adjusted  appropriately.
In the event that any additional  shares of Seller Common Stock are issued after
the date of this Option  Agreement (other than pursuant to an event described in
the  preceding  sentence or pursuant  to this Option  Agreement),  the number of
shares of Seller  Common Stock  subject to the Option shall be adjusted so that,
after such issuance,  it equals at least 19.9% of the number of shares of Seller
Common Stock then issued and outstanding, without giving effect to any shares of
Seller Common Stock subject to or issued pursuant to the Option.

     7. Repurchase.
                           
     (a) Subject to the giving of any  notices and the receipt of any  approvals
as contemplated by Section 11(i), at the request of Buyer at any time commencing
upon the first  occurrence of a Purchase Event  described in Section 3(b) hereof
and ending 12 months  immediately  thereafter but not later than the termination
of the Option pursuant to Section 3(a) hereof (the "Repurchase Period"),  Seller
(or any  successor  entity  thereof)  shall  repurchase  the  Option  from Buyer
together wit all (but not less than all, subject to Section 10) shares of Seller
Common Stock purchased by Buyer pursuant hereto with respect to which Buyer then
has  Beneficial  Ownership,  at an  aggregate  price (per share,  the "Per Share
Repurchase Price") equal to the sum of:

          (i) The exercise  price paid by Buyer for any shares of Seller  Common
     Stock acquired pursuant to the Option;
                                            
          (ii) The difference  between (A) the  "Market/Tender  Offer Price" for
     shares of Seller  Common  Stock  (defined  as the higher (x) of the highest
     price  per  share at which a tender  or  exchange  offer  has been made for
     shares of Seller  Common Stock or (y) the highest  closing  sales price per
     share of Seller Common Stock  reported by the Nasdaq  National  Market,  in
     each case for any day within  that  portion of the  Repurchase  Period that
     precedes the date Buyer gives notic of the required  repurchase  under this
     Section 7) and (B) the exercise  price as determined  pursuant to Section 2
     hereof (subject to adjustment as provided in Section 6),  multiplied by the
     number of shares of Seller  Common  Stock with  respect to which the Option
     has not  been  exercised,  but  only if the  Market/Tender  Offer  Price is
     greater than such  exercise  price;  and 

                                       59
<PAGE>
          (iii) The  difference  between the  Market/Tender  Offer Price and the
     exercise  price  paid by  Buyer  for any  shares  of  Seller  Common  Stock
     purchased pursuant to the exercise of the Option,  multiplied by the number
     of  shares  so  purchased,  but only if the  Market/Tender  Offer  Price is
     greater than such exercise price.

     (b) In the event Buyer  exercises  its rights  under this Section 7, Seller
shall,  within 10 business days thereafter,  pay the required amount to Buyer by
wire transfer of immediately  available funds to an account  designated by Buyer
and Buyer shall surrender to Seller the Option and the  certificates  evidencing
the shares of Seller  Common Stock  purchased  thereunder  with respect to which
Buyer then has  Beneficial  Ownership,  and Buyer shall warrant that it has sole
record and  Beneficial  Ownership  of such shares and that the same are free and
clear of all liens, claims,  charges,  restrictions and encumbrances of any kind
whatsoever.
                           
     (c)  In  determining  the  Market/Tender  Offer  Price,  the  value  of any
consideration  other than cash shall be determined by an independent  nationally
recognized  investment banking firm selected by Buyer and reasonably  acceptable
to Seller.

     8. Repurchase at Option of Seller and First Refusal.

     (a) Except to the extent that Buyer  shall have  previously  exercised  its
rights under  Section 7, at the request of Seller  during the  six-month  period
commencing 12 months following the first occurrence of a Purchase Event,  Seller
may repurchase  from Buyer,  and Buyer shall sell the Option to Seller  together
with all (but not less than all,  subject  to Section  10) of the Seller  Common
Stock  acquired  by Buyer  pursuant  hereto and with  respect to which Buyer has
Beneficial  Ownership at the time of such  repurchase at a price per share equal
to the greater of (i) the Per Share  Repurchase Price or (ii) the sum of (A) the
aggregate  Purchase Price of the shares so repurchased  plus (B) interest on the
aggregate  Purchase  Price paid for the shares so  repurchased  from the date of
purchase to the date of repurchase at the highest rate of interest  announced by
Buyer as its prime or base  lending or reference  rate during such period,  less
any dividends  received on the shares so repurchased.  Any repurchase under this
Section 8(a) shall be consummated in accordance with Section 7(b).

     (b) If, at any time after the  occurrence of a Purchase  Event and prior to
the  earlier  of (i) the  expiration  of 18 months  immediately  following  such
Purchase Event or (ii) the expiration or termination of the Option,  Buyer shall
desire to sell,  assign,  transfer or otherwise  dispose of the Option or all or
any of the shares of Seller Common Stock  acquired by it pursuant to the Option,
it shall give Seller written notice of the proposed  transaction  (an "Offeror's
Notice"),  identifying the proposed  transferee,  and setting forth the terms of
the proposed transaction.  An Offeror's Notice shall be deemed an offer by Buyer
to Seller,  which may be accepted within 10 business days of the receipt of such
Offeror's  Notice,  on the same  terms and  conditions  and at the same price at
which Buyer is proposing to transfer the Option or such shares to a third party.
In the event the  proposed  transaction  involves  the sale of the Option or the
shares of Seller Common Stock  purchased  pursuant to the exercise of the Option
for  consideration  other than cash,  the value of such  consideration  shall be
determined  by an  independent  nationally  recognized  investment  banking firm
selected  by Buyer and  reasonably  acceptable  to Seller.  The  purchase of the
Option or any such shares by Seller shall be closed  within 10 business  days of
the date of the  acceptance of the offer and the purchase price shall be paid to
Buyer by wire transfer of immediately  available funds to an account  designated
by Buyer.  In the event of the  failure  or refusal  of Seller to  purchase  the
Option or all the  shares  covered  by the  Offeror's  Notice or if the  Federal
Reserve Board or any other Regulatory  Authority  disapproves  Seller's proposed
purchase of the Option or such shares,  Buyer may,  within 60 days from the date
of the Offeror's Notice,  sell all, but not less than all, of the Option or such
shares to such third party at no less than the price  specified  and on terms no
more  favorable to the purchaser  than those set forth in the Offeror's  Notice.
The  requirements of this Section 8(b) shall not apply to (i) any disposition as
a result of which the proposed  transferee would  Beneficially Own not more than
2% of the voting power of Seller or (ii) any  disposition of Seller Common Stock
by a person to whom Buyer has sold  shares of Seller  Common  Stock  issued upon
exercise of the Option.

                                       60
<PAGE>
     9.  Registration  Rights.  At any time after the  exercise of the Option by
Buyer for an aggregate  of at least 50% of the shares  subject  thereto,  Seller
shall,  subject to the  conditions set forth herein,  if requested by Buyer,  as
expeditiously as practicable file a registration statement on a form for general
use under the  Securities  Act if necessary in order to permit the sale or other
disposition  of the shares of Seller  Common Stock that have been  acquired upon
exercise of the Option in accordance  with the intended  method of sale or other
disposition  requested  by Buyer (it being  understood  and agreed that any such
sale or other  disposition  shall be effected on a widely  distributed  basis so
that, upon consummation  thereof,  no purchaser or transferee shall Beneficially
Own more than 2% of the shares of Seller Common Stock then  outstanding).  Buyer
shall provide all  information  reasonably  requested by Seller for inclusion in
any registration statement to be filed hereunder. Selle shall use its reasonable
best efforts to cause such registration  statement first to become effective and
then to remain  effective  for such period not in excess of 90 days from the day
such  registration  statement  first  becomes  effective  as may  be  reasonably
necessary to effect such sales or other dispositions.  The registration effected
under  this  Section 9 shall be at  Seller's  expense  except  for  underwriting
discounts and  commissions  and the fees and  disbursements  of Buyer's  counsel
attributable to the  registration of such Seller Common Stock. In no event shall
Seller be required to effect more than one registration hereunder. The filing of
the registration  statement  hereunder may be delayed for such period of time as
may  reasonably be required to facilitate any public  distribution  by Seller of
Seller Common Stock or if a special audit of Seller would  otherwise be required
in  connection  therewith.  If  requested  by  Buyer  in  connection  with  such
registration, Seller shall become a party to any underwriting agreement relating
to the sale of such  shares,  but only to the  extent  of  obligating  itself in
respect  of  representations,   warranties,  indemnities  and  other  agreements
customarily  included in such  underwriting  agreements  for  parties  similarly
situated.

     10. Severability. Any term, provision, covenant or restriction contained in
this Option  Agreement  held by a court or a  Regulatory  Authority of competent
jurisdiction to be invalid,  void or unenforceable,  shall be ineffective to the
extent  of such  invalidity,  voidness  or  unenforceability,  but  neither  the
remaining terms, provisions,  covenants or restrictions contained in this Option
Agreement nor the validity or enforceability  thereof in any other  jurisdiction
shall be  affected  or  impaired  thereby.  Any  term,  provision,  covenant  or
restriction  contained in this Option  Agreement that is so found to be so broad
as to be unenforceable shall be interpreted to be as broad as is enforceable. If
for any reason such court or Regulatory Authority determines that applicable law
will not permit Buyer or any other person to acquire, or Seller to repurchase or
purchase, the full number of shares of Seller Common Stock provided in Section 2
hereof (as adjusted  pursuant to Section 6 hereof),  it is the express intention
of the parties hereto to allow Buyer or such other person to acquire,  or Seller
to repurchase or purchase,  such lesser number of shares as may be  permissible,
without any amendment or modification hereof.

     11. Miscellaneous.

     (a) Expenses.  Each of the parties  hereto shall pay all costs and expenses
incurred by it or on its behalf in connection with the transactions contemplated
hereunder,  including  fees  and  expenses  of its  own  financial  consultants,
investment  bankers,  accountants  and  counsel,  except as  otherwise  provided
herein.

     (b) Entire Agreement.  Except as otherwise  expressly provided herein, this
Option Agreement and the Merger Agreement  contain the entire agreement  between
the  parties  with  respect  to  the  transactions  contemplated  hereunder  and
supersedes  all prior  arrangements  or  understandings  with  respect  thereto,
written or oral.

     (c) Successors;  No Third Party Beneficiaries.  The terms and conditions of
this Option  Agreement  shall  inure to the  benefit of and be binding  upon the
parties hereto and their respective successors and permitted assigns. Nothing in
this Option  Agreement,  expressed  or  implied,  is intended to confer upon any
party,  other than the  parties  hereto,  and their  respective  successors  and
assigns, any rights, remedies,  obligations or liabilities under or by reason of
this Option Agreement, except as expressly provided herein.

                                       61
<PAGE>
     (d) Assignment.  Other than as provided in Section 8 hereof, neither of the
parties  hereto may sell,  transfer,  assign or otherwise  dispose of any of its
rights  or  obligations  under  this  Option  Agreement  or the  Option  created
hereunder  to any other  person  (whether  by  operation  of law or  otherwise),
without the express written consent of the other party.

     (e)  Notices.  All  notices or other  communications  that are  required or
permitted  hereunder  shall  be  in  writing  and  sufficient  if  delivered  in
accordance  with Section  8.08 of the Merger  Agreement  (which is  incorporated
herein by reference).

     (f)  Counterparts.  This Option  Agreement may be executed in counterparts,
and each such counterpart shall be deemed to be an original instrument, but both
such counterparts together shall constitute but one agreement.

     (g) Specific  Performance.  The parties hereto agree that if for any reason
Buyer or Seller shall have failed to perform its  obligations  under this Option
Agreement,  then either  party hereto  seeking to enforce this Option  Agreement
against such non-performing  party shall be entitled to specific performance and
injunctive and other equitable  relief,  and the parties hereto further agree to
waive any requirement for the securing or posting of any bond in connection with
the obtaining of any such injunctive or other equitable  relief.  This provision
is without  prejudice  to any other  rights  that either  party  hereto may have
against the other party hereto for any failure to perform its obligations  under
this Option Agreement.

     (h) Governing Law. This Option Agreement shall be governed by and construed
in  accordance  with the laws of the State of Missouri  applicable to agreements
made and entirely to be performed within such state.

     (i) Regulatory  Approvals;  Section 16(b).  If, in connection  with (A) the
exercise of the Option under Section 3 or a sale by Buyer to a third party under
Section  8, (B) a  repurchase  by  Seller  under  Section 7 or a  repurchase  or
purchase by Seller  under  Section 8, prior  notification  to or approval of the
Federal Reserve Board, or any other Regulatory  Authority is required,  then the
required  notice  or  application  for  approval  shall be  promptly  filed  and
expeditiously processed and periods of time that otherwise would run pursuant to
such  Sections  shall  run  instead  from the date on  which  any such  required
notification  period has expired or been  terminated  or such  approval has been
obtained,  and in either event, any requisite  waiting period shall have passed.
In the case of clause (A) of this  subsection  (i), such filing shall be made by
Buyer,  and in the case of clause (B) of this  subsection (i), such filing shall
be made by Seller,  provided  that each of Buyer and  Seller  shall use its best
efforts to make all filings with,  and to obtain  consents of, all third parties
and Regulatory  Authorities  necessary to the  consummation of the  transactions
contemplated  hereby,  including,  without  limitation,  applying to the Federal
Reserve  Board under the Holding  Company Act for approval to acquire the shares
issuable  hereunder.  Periods  of time  that  otherwise  would run  pursuant  to
Sections  3, 7 or 8 shall  also be  extended  to the extent  necessary  to avoid
liability  under  Section  16(b) of the  Exchange  Act.  

     (j) No Breach of Merger  Agreement  Authorized.  Nothing  contained in this
Option  Agreement  shall be deemed to  authorize  Seller to issue any  shares of
Seller Common Stock in breach of, or otherwise  breach any of, the provisions of
the Merger Agreement nor shall any action taken hereunder by Seller constitute a
breach of any of the provisions of the Merger Agreement.

     (k) Waiver and  Amendment.  Any  provision of this Option  Agreement may be
waived  at any  time by the  party  that is  entitled  to the  benefits  of such
provision.  This  Option  Agreement  may not be  modified,  amended,  altered or
supplemented  except upon the  execution  and  delivery  of a written  agreement
executed by the parties hereto.

                                       62
<PAGE>

     IN WITNESS  WHEREOF,  each of the parties  hereto has executed  this Option
Agreement as of the date first written above.

                                           MERCANTILE BANCORPORATION INC.

                                           By: /s/  John W. Rowe
                                           -----------------------------------
                                           John W. Rowe
                                           Executive Vice President, 
                                           Mercantile Bank National Association,
                                           Authorized Officer

                                           FIRST FINANCIAL BANCORPORATION

                                           By: /s/  Robert M. Sierk
                                           -----------------------------------
                                           Robert M. Sierk
                                           President and Chief Executive Officer































                                       63

<PAGE>
                                  EXHIBIT 99.1

FIRST FINANCIAL BANCORPORATION
NEWS RELEASE - FOR IMMEDIATE USE
Date:   May 8, 1998              Contacts:   Robert M. Sierk, President & CEO
                                             (319) 356-9024

To:     Media Name                           A. Russell Schmeiser, EVP & COO
        Attention:  Contact Name             (319) 356-9038
        Mailing Address
        City, State 00000

FIRST FINANCIAL BANCORPORATION ANNOUNCES PLANS TO MERGE WITH
MERCANTILE

Iowa City - First Financial  Bancorporation  today announced plans to merge with
Mercantile Bancorporation Inc. (NYSE:MTL),  the St. Louis-based $32 billion bank
holding  company.  First Financial  Bancorporation,  headquartered in Iowa City,
Iowa, is the $550 million one-bank holding company for First National Bank Iowa,
which operates in ten locations in the Iowa City/Cedar Rapids Corridor.

First  Financial's   merger  with  Mercantile  will   substantially   strengthen
Mercantile's  market share position in Iowa,  moving it to the unrivaled  number
two position in the state.  The acquisition  also will allow Mercantile to enter
the rapidly growing Iowa City/Cedar  Rapids Corridor,  garnering a strong market
share  position  in Iowa City and  enhancing  the  company's  presence  in Cedar
Rapids.  In addition to  improving  Mercantile's  market  position in the state,
First  Financial  operates one of the largest trust  departments  in Iowa,  with
nearly $780 million in assets.

"The merger with First  Financial,  in conjunction  with the recently  announced
Financial Services  Corporation of Rock Island,  Illinois,  merger,  complements
Mercantile's  existing  franchises  in east  and  east  central  Iowa,"  said W.
Randolph Adams, Senior Executive Vice President and Chief Administrative Officer
of Mercantile Bancorporation Inc. "We now have a prominent Iowa market presence,
reaching from the Mississippi River to the state's western border."

"The  opportunity to affiliate with  Mercantile  provides us with an exceptional
financial partner who shares our same community banking philosophy," said Robert
M.  Sierk,   President   and  Chief   Executive   Officer  of  First   Financial
Bancorporation.  "Since  Mercantile  entered  the Iowa  market in 1993,  we have
watched  their  growth  and  progress,  as  well  as  their  commitment  to  the
communities  they  serve."  Following  the  merger,  Sierk  will  serve as Chief
Executive Officer for the organization's Iowa City banking franchise.

Based upon  Mercantile's  closing  stock price of  $52.8125 on May 7, 1998,  the
transaction  is  valued  at   approximately   $169  million.   First   Financial
Bancorporation  shareholders will receive 0.88 shares of Mercantile common stock
for each share or share  equivalent  of First  Financial  Bancorporation  common
stock. The merger is structured as a tax-free exchange, will be accounted for as
a pooling of  interests,  and is expected to close in the third quarter of 1998.
As part of its agreement with Mercantile,  First Financial granted Mercantile an
option to acquire  19.9 percent of its issued and  outstanding  shares of common
stock,  exercisable  under certain  circumstances.  In addition,  Mercantile may
repurchase up to ten percent of the shares issued in the transaction. The merger
is subject to the approval of First Financial  Bancorporation  shareholders  and
various  regulatory  authorities,  and is projected  to be accretive  during the
first year.

Mercantile Bancorporation,  Inc., a $32 billion asset multi-bank holding company
headquartered  in St.  Louis,  operates  offices  in  more  than  500  locations
throughout Missouri,  Iowa, Kansas, Illinois and Arkansas.  Mercantile currently
has  acquisitions  pending  with  CBT  Corporation,  headquartered  in  Paducah,
Kentucky; Firstbank of Illinois Co., headquartered in Springfield, Illinois; and
Financial  Services  Corporation of the Midwest,  headquartered  in Rock Island,
Illinois.  Mercantile's  non-banking  subsidiaries  include companies  providing
brokerage services,  asset-based lending,  investment advisory services, leasing
services and credit life and other insurance products as agent.

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