MAHASKA INVESTMENT CO
S-4, 1999-05-26
STATE COMMERCIAL BANKS
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<PAGE>   1
As filed with the Securities and Exchange Commission on May 26, 1999

                                            Registration No. 333-_______________

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

                           MAHASKA INVESTMENT COMPANY
             (Exact name of Registrant as specified in its charter)

<TABLE>
<S>                                      <C>                                         <C>
             IOWA                                    6022                                42-1003699
(State or other jurisdiction of          (Primary standard industrial                 (I.R.S. employer
incorporation or organization)             classification code no.)                  identification no.)
</TABLE>

                              222 First Avenue East
                              Oskaloosa, Iowa 52577
                                 (515) 673-8448

                              --------------------
               (Address, including zip code and telephone number,
       including area code, of Registrant's principal executive offices)

                                Charles S. Howard
                             Chairman and President
                           Mahaska Investment Company
                              222 First Avenue East
                              Oskaloosa, Iowa 52577
                                 (515) 673-8448

                        ---------------------------------
            (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

                          Copies of correspondence to:

<TABLE>
<S>                            <C>                                       <C>
Matthew C. Boba, Esq.          William D. Hassel                         Martin L. Meyrowitz, P.C.
Chapman and Cutler             President and Chief Executive Officer     Silver, Freedman & Taff, L.L.P.
111 West Monroe Street         Midwest Bancshares, Inc.                  1100 New York Avenue, N.W.
Chicago, Illinois  60603       3225 Division Street                      Washington, D.C. 20005
(312) 845-3000                 Burlington, Iowa  52601                   (202) 414-6100
                               (319) 754-6526
</TABLE>

         APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: Upon
consummation of the merger described herein.
<PAGE>   2
         If the securities being registered on this Form are being offered in
connection with the formation of a holding company and there is compliance with
General Instruction G, check the following box. [ ]

         If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering. [ ]

         If this Form is a post-effective amendment filed pursuant to Rule
462(d) under the Securities Act, check the following box and list the Securities
Act registration statement number of the earlier effective registration
statement for the same offering. [ ]

                         CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
======================================================================================================================
Title of Each Class                                  Proposed Maximum      Proposed Maximum           Amount of
of Securities to be         Amount to be             Offering Price Per    Aggregate Offering     Registration Fee(2)
     Registered             Registered(1)             Share or Unit(2)          Price(2)
- ----------------------------------------------------------------------------------------------------------------------
<S>                         <C>                          <C>                      <C>                    <C>
 Common Stock, par          1,119,473 shares             $17.5625                 $19,660,745            $5,466
 value $5.00 per share
======================================================================================================================
</TABLE>

(1)      This Registration Statement covers the maximum number of shares of
         common stock of the Registrant issuable upon consummation of the merger
         of Midwest Bancshares, Inc. with the Registrant.

(2)      Pursuant to Rule 457(f) under the Securities Act of 1933, the
         registration fee is based on the average of the high and low prices of
         the Midwest common stock on May 21, 1999.

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

         THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE
OR DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT
SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.
<PAGE>   3
                           MAHASKA INVESTMENT COMPANY
                             222 FIRST AVENUE EAST
                             OSKALOOSA, IOWA 52577
                                 (515) 673-8448


                               ____________, 1999



Dear Shareholder:

         You are cordially invited to attend a special meeting of shareholders
of Mahaska Investment Company at 2:00 p.m., central time, on ______________,
1999 at the Elmhurst Country Club, 2214 South 11th Street, Oskaloosa, Iowa
52577.

         On February 2, 1999, Mahaska and Midwest Bancshares, Inc. entered into
an Agreement and Plan of Merger which provides for the merger of Midwest with
and into Mahaska.

         At the special meeting, you will be asked to consider and vote upon a
proposal to approve the merger agreement. If the merger agreement is approved
and the merger is completed, each outstanding share of Midwest common stock will
be converted into the right to receive one share of Mahaska common stock.

         Your board of directors has determined the merger to be fair and in the
best interests of Mahaska and its shareholders and has unanimously adopted the
merger agreement and the merger. THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS
THAT SHAREHOLDERS VOTE "FOR" APPROVAL OF THE MERGER AGREEMENT.

         Enclosed are a proxy card, a Notice of Special Meeting of Shareholders
and a joint proxy statement/prospectus which describes the merger, its effects
and the background of the transaction. A copy of the merger agreement is
included as Annex I to the accompanying prospectus/joint proxy statement. Also
enclosed are (i) for Mahaska, its 1998 Annual Report to Shareholders and
Quarterly Report on Form 10-Q for the quarter ended March 31, 1999 and (ii) for
Midwest, its 1998 Annual Report to Stockholders and its Form 10-QSB for the
quarter ended March 31, 1999. You are urged to read all of these materials
carefully.

         It is very important that your shares be represented at the special
meeting. FAILURE TO RETURN A PROPERLY EXECUTED PROXY CARD OR TO VOTE AT THE
SPECIAL MEETING WILL HAVE THE SAME EFFECT AS A VOTE AGAINST THE MERGER
AGREEMENT. Accordingly, even if you plan to be present at the special meeting,
you are requested to complete, date, sign, and return the proxy card in the
enclosed postage-paid envelope as soon as possible. If you decide to attend the
special meeting, you may vote your shares in person whether or not you have
previously submitted a proxy.
<PAGE>   4
         On behalf of the board, I thank you for your attention to this
important matter.


                                       Very truly yours,



                                       Charles S. Howard
                                       Chairman and President
<PAGE>   5
                           MAHASKA INVESTMENT COMPANY
                             222 FIRST AVENUE EAST
                             OSKALOOSA, IOWA 52577
                                 (515) 673-8448


                   NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
                       TO BE HELD ON ______________, 1999

         Notice is hereby given that a special meeting of shareholders of
Mahaska Investment Company will be held at 2:00 p.m., central time, on
__________, 1999 at the Elmhurst Country Club, 2214 South 11th Street,
Oskaloosa, Iowa 52577 for the following purposes:

                      1. To consider and vote upon a proposal to approve an
         Agreement and Plan of Merger, dated as of February 2, 1999, by and
         between Mahaska and Midwest Bancshares, Inc., which provides, among
         other things, for the merger of Midwest with and into Mahaska. In the
         merger, Midwest shareholders will receive one share of Mahaska common
         stock for each share of Midwest common stock owned.

         The board of directors has fixed the close of business on ____________,
1999 as the record date for the determination of shareholders entitled to notice
of and to vote at the special meeting. Only holders of common stock of Mahaska
of record at the close of business on that date will be entitled to notice of
and to vote at the special meeting.

         THE BOARD OF DIRECTORS OF MAHASKA HAS DETERMINED THE MERGER IS FAIR AND
IN THE BEST INTERESTS OF MAHASKA AND ITS SHAREHOLDERS AND UNANIMOUSLY RECOMMENDS
THAT SHAREHOLDERS VOTE "FOR" APPROVAL OF THE MERGER AGREEMENT.

                                       By Order of the Board of Directors



                                       Charles S. Howard
                                       Chairman and President

Oskaloosa, Iowa
____________, 1999


- --------------------------------------------------------------------------------
YOU ARE CORDIALLY INVITED TO ATTEND THE SPECIAL MEETING. FAILURE TO RETURN A
PROPERLY EXECUTED PROXY CARD OR TO VOTE AT THE SPECIAL MEETING WILL HAVE THE
SAME EFFECT AS A VOTE AGAINST THE MERGER AGREEMENT. ACCORDINGLY, EVEN IF YOU
PLAN TO BE PRESENT AT THE SPECIAL MEETING, YOU ARE REQUESTED TO COMPLETE, DATE,
SIGN AND RETURN THE PROXY CARD IN THE ENCLOSED POSTAGE-PAID ENVELOPE AS SOON AS
POSSIBLE. IF YOU ATTEND THE SPECIAL MEETING, YOU MAY VOTE EITHER IN PERSON OR BY
PROXY. ANY PROXY GIVEN MAY BE REVOKED BY YOU IN WRITING OR IN PERSON AT ANY TIME
PRIOR TO ITS EXERCISE.
- --------------------------------------------------------------------------------
<PAGE>   6
                            MIDWEST BANCSHARES, INC.
                              3225 DIVISION STREET
                             BURLINGTON, IOWA 52601
                                 (319) 754-6526


                               _____________, 1999


Dear Stockholder:

         You are cordially invited to attend the annual meeting of stockholders
of Midwest Bancshares, Inc. at 2:00 p.m., central time, on _____________, 1999
at 3225 Division Street, Burlington, Iowa 52601.

         On February 2, 1999, Midwest and Mahaska Investment Company entered
into an Agreement and Plan of Merger which provides for the merger of Midwest
with and into Mahaska.

         At the annual meeting, you will be asked to consider and vote upon a
proposal to adopt the merger agreement. If the merger agreement is adopted and
the merger is completed, each outstanding share of Midwest common stock will be
converted into the right to receive one share of Mahaska common stock. You will
also be asked to elect two directors and ratify the appointment of our auditors.

         Your board of directors has determined the merger to be fair and in the
best interests of Midwest and its stockholders and has unanimously approved the
merger agreement and the merger. THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS
THAT STOCKHOLDERS VOTE "FOR" ADOPTION OF THE MERGER AGREEMENT.

         Enclosed are a proxy card, a Notice of Annual Meeting of Stockholders
and a joint proxy statement/prospectus which describes the merger, its effects
and the background of the transaction. A copy of the merger agreement is
included as Annex I to the accompanying joint proxy statement/prospectus. Also
enclosed are (i) for Midwest, its 1998 Annual Report to Stockholders and
Quarterly Report on Form 10-QSB for the quarter ended March 31, 1999 and (ii)
for Mahaska, its 1998 Annual Report to Shareholders and Quarterly Report on Form
10-Q for the quarter ended March 31, 1999. You are urged to read all of these
materials carefully.

         It is very important that your shares be represented at the annual
meeting. FAILURE TO RETURN A PROPERLY EXECUTED PROXY CARD OR TO VOTE AT THE
ANNUAL MEETING WILL HAVE THE SAME EFFECT AS A VOTE AGAINST THE MERGER AGREEMENT.
Accordingly, even if you plan to be present at the annual meeting, you are
requested to complete, date, sign, and return the proxy card in the enclosed
postage-paid envelope as soon as possible. However, the failure to return your
proxy or vote will not have this effect on the election of directors or the
ratification of auditors. Their approval is based on a percentage of votes
actually cast in favor of or against the proposals. If
<PAGE>   7
you decide to attend the annual meeting, you may vote your shares in person
whether or not you have previously submitted a proxy.

         On behalf of the board, I thank you for your attention to these
important matters.

                                       Very truly yours,

                                       William D. Hassel
                                       President and Chief Executive Officer
<PAGE>   8
                            MIDWEST BANCSHARES, INC.
                              3225 DIVISION STREET
                             BURLINGTON, IOWA 52601
                                 (319) 754-6526


                    NOTICE OF ANNUAL MEETING OF STOCKHOLDERS
                         TO BE HELD ON __________, 1999


         Notice is hereby given that the annual meeting of stockholders of
Midwest Bancshares, Inc. will be held at 2:00 p.m., central time, on _________,
1999 at 3225 Division Street, Burlington, Iowa 52601 for the following purposes:

                      1. To consider and vote upon a proposal to adopt an
         Agreement and Plan of Merger, dated as of February 2, 1999, by and
         between Mahaska Investment Company and Midwest, which provides, among
         other things, for the merger of Midwest with and into Mahaska. In the
         merger, you will receive one share of Mahaska common stock for each
         share of Midwest common stock you own;

                      2.   The election of two directors of Midwest;

                      3. The ratification of the appointment of KPMG LLP as
         auditors for the fiscal year ending December 31, 1999; and

any other matters as may properly come before the meeting. The board of
directors is not aware of any other business to come before the meeting.

         The board of directors has fixed the close of business on __________,
1999 as the record date for the determination of stockholders entitled to notice
of and to vote at the annual meeting. Only holders of common stock of Midwest of
record at the close of business on that date will be entitled to notice of and
to vote at the annual meeting.

         THE BOARD OF DIRECTORS OF MIDWEST HAS DETERMINED THE MERGER IS FAIR AND
IN THE BEST INTERESTS OF MIDWEST AND ITS STOCKHOLDERS AND UNANIMOUSLY RECOMMENDS
THAT STOCKHOLDERS VOTE "FOR" ADOPTION OF THE MERGER AGREEMENT.

                                       By Order of the Board of Directors



                                       William D. Hassel
                                       President and Chief Executive Officer

Burlington, Iowa
____________, 1999
<PAGE>   9
- --------------------------------------------------------------------------------
YOU ARE CORDIALLY INVITED TO ATTEND THE ANNUAL MEETING. FAILURE TO RETURN A
PROPERLY EXECUTED PROXY CARD OR TO VOTE AT THE ANNUAL MEETING WILL HAVE THE SAME
EFFECT AS A VOTE AGAINST THE MERGER AGREEMENT. ACCORDINGLY, EVEN IF YOU PLAN TO
BE PRESENT AT THE ANNUAL MEETING, YOU ARE REQUESTED TO COMPLETE, DATE, SIGN AND
RETURN THE PROXY CARD IN THE ENCLOSED POSTAGE-PAID ENVELOPE AS SOON AS POSSIBLE.
FAILURE TO RETURN YOUR PROXY CARD OR VOTE WILL NOT HAVE THIS EFFECT ON THE
ELECTION OF DIRECTORS, WHICH IS BASED ON A PLURALITY OF THE VOTES ACTUALLY CAST,
OR THE RATIFICATION OF AUDITORS, WHICH IS BASED ON A PERCENTAGE OF VOTES
ACTUALLY CAST IN FAVOR OF OR AGAINST THE PROPOSAL. IF YOU ATTEND THE ANNUAL
MEETING, YOU MAY VOTE EITHER IN PERSON OR BY PROXY. ANY PROXY GIVEN MAY BE
REVOKED BY YOU IN WRITING OR IN PERSON AT ANY TIME PRIOR TO ITS EXERCISE.
- --------------------------------------------------------------------------------
<PAGE>   10
      JOINT PROXY STATEMENT FOR THE                     PROSPECTUS OF
    SPECIAL MEETING OF SHAREHOLDERS OF           MAHASKA INVESTMENT COMPANY

        MAHASKA INVESTMENT COMPANY                     _______________
AND THE ANNUAL MEETING OF STOCKHOLDERS OF               Common Stock

         MIDWEST BANCSHARES, INC.                (Par Value $5.00 Per Share)
            __________________
            Each to be held on
            ____________, 1999

         On February 2, 1999, the boards of directors of Mahaska Investment
Company and Midwest Bancshares, Inc. approved a merger agreement providing for
the merger of Midwest with and into Mahaska with Mahaska being the surviving
corporation.

         If the merger is completed, Midwest stockholders will receive one share
of Mahaska common stock for each share of Midwest common stock they own. The
Mahaska common stock is traded on the Nasdaq National Market under the symbol
"OSKY" and the Midwest common stock is traded on the Nasdaq SmallCap Market
under the symbol "MWBI."

         The merger cannot be completed unless the shareholders of Mahaska and
the stockholders of Midwest vote in favor of the merger agreement. We have
scheduled a special meeting of Mahaska's shareholders and the annual meeting of
Midwest's stockholders to vote on the merger agreement. Midwest's stockholders
will also vote on the election of two directors and the ratification of
auditors. The date, time and place of the meetings are as follows:

<TABLE>

SPECIAL MEETING OF SHAREHOLDERS OF MAHASKA:       ANNUAL MEETING OF STOCKHOLDERS OF MIDWEST:
__________, 1999                                  __________, 1999
<S>                                               <C>
2:00 p.m., central time                           2:00 p.m., central time
Elmhurst Country Club                             Midwest Bancshares, Inc.
2214 South 11th Street                            3225 Division Street
Oskaloosa, Iowa 52577                             Burlington, Iowa 52601
</TABLE>


         You should consider the "Risk Factors" beginning on page 17 before
voting.

         This joint proxy statement/prospectus provides detailed information
about the merger agreement and the merger. We encourage you to read this entire
document carefully, together with the merger agreement which is attached as
Annex I. We also encourage you to read carefully the publicly filed documents of
Mahaska and Midwest which are attached. These documents contain important
business and financial information about Mahaska and Midwest.

         YOUR VOTE IS VERY IMPORTANT. Whether or not you plan to attend the
meetings, please take the time to vote by completing and mailing the enclosed
proxy card. If you do not return your card, the effect will be a vote against
the merger agreement.
<PAGE>   11
- --------------------------------------------------------------------------------
NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THE MAHASKA COMMON STOCK TO BE ISSUED
IN THE MERGER OR DETERMINED IF THIS JOINT PROXY STATEMENT/PROSPECTUS IS ACCURATE
AND COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE. THE
SHARES OF MAHASKA COMMON STOCK ARE NOT INSURED BY THE FEDERAL DEPOSIT INSURANCE
CORPORATION OR ANY OTHER GOVERNMENT AGENCY.
- --------------------------------------------------------------------------------

         The date of this joint proxy statement/prospectus is _____________,
1999.
<PAGE>   12
         This joint proxy statement/prospectus incorporates documents of Mahaska
and Midwest by reference which are not presented herein or delivered herewith.
All of these documents with respect to Mahaska are available without charge
(other than certain exhibits to such documents) upon written or oral request
from: Mahaska Investment Company, 222 First Avenue East, Oskaloosa, Iowa 52577,
Attention: Karen K. Baack, Secretary (Telephone Number (515) 673-8448). All of
these documents with respect to Midwest are available without charge (other than
certain exhibits to such documents) upon written or oral request from: Midwest
Bancshares, Inc., 3225 Division Street, Burlington, Iowa 52601, Attention:
Denise Thompson, Assistant Secretary (Telephone Number (319) 754-6526).

         If you would like to request documents, please do so by _________, 1999
in order to receive them before your meeting.

                                                 TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                        PAGE
<S>                                                                                     <C>
SUMMARY.............................................................................     1

COMPARATIVE PER SHARE DATA..........................................................     8

SELECTED CONSOLIDATED FINANCIAL DATA OF MAHASKA.....................................    11

SELECTED CONSOLIDATED FINANCIAL DATA OF MIDWEST.....................................    13

SELECTED PRO FORMA CONSOLIDATED FINANCIAL DATA......................................    15

RISK FACTORS........................................................................    17

       Risks Specific to the Merger.................................................    17
       Risks Specific to the Companies..............................................    17
       Year 2000 Readiness Disclosure...............................................    20

MARKET FOR COMMON STOCK AND DIVIDENDS...............................................    23

GENERAL INFORMATION.................................................................    24

THE MEETINGS........................................................................    24

       Time, Date and Place.........................................................    24
       Matters to be Considered.....................................................    24
       Shares Outstanding and Entitled To Vote; Record Dates........................    25
       Votes Required...............................................................    25
</TABLE>


                                      -i-
<PAGE>   13
<TABLE>
                                                                                        PAGE
<S>                                                                                     <C>
       Voting and Revocation of Proxies.............................................    26
       Solicitation of Proxies......................................................    26
       Appraisal Rights.............................................................    27

THE MERGER..........................................................................    27

       General......................................................................    28
       Material Contacts and Board Deliberations....................................    28
       Recommendations of the Boards of Directors and Reasons for the Merger........    30
       Opinions of Financial Advisors...............................................    32

THE MERGER AGREEMENT................................................................    42

       Effective Time of the Merger.................................................    42
       Exchange of Midwest Common Stock Certificates................................    42
       Assumption of Midwest Stock Options..........................................    42
       Conditions to the Merger.....................................................    42
       Regulatory Approvals.........................................................    44
       Business Pending the Merger..................................................    45
       No Solicitation..............................................................    46
       Termination and Amendment....................................................    46
       Interests of Certain Persons in the Merger...................................    47
       Employee Matters.............................................................    48
       Resale of Mahaska Common Stock...............................................    48
       Federal Income Tax Consequences..............................................    49
       Accounting Treatment of the Merger...........................................    50
       Expenses of the Merger.......................................................    51
       Letter Agreements............................................................    51
       Appraisal Rights.............................................................    51
       Management After the Merger..................................................    54
       Stock Ownership Following the Merger.........................................    54

PRO FORMA FINANCIAL INFORMATION.....................................................    56

COMPARISON OF THE RIGHTS OF SHAREHOLDERS............................................    64

       Mahaska Common Stock.........................................................    64
       Midwest Capital Stock........................................................    65
       Issuance of Capital Stock....................................................    65
       Voting Rights................................................................    66
       Payment of Dividends.........................................................    66
       Board of Directors...........................................................    66
       Limitations on Liability.....................................................    67
       Special Meetings of the Shareholders/Stockholders............................    67
       Shareholder Nominations and Proposals........................................    68
       Limitations Acquisitions of Voting Stock and Voting Rights...................    69
       Mergers, Consolidations and Sales of Assets..................................    69
</TABLE>


                                      -ii-
<PAGE>   14
<TABLE>
                                                                                        PAGE
<S>                                                                                     <C>
       Business Combinations with Interested Stockholders...........................    69
       Acquisition of Equity Securities.............................................    71
       Transfer Agent...............................................................    71

LEGAL OPINION.......................................................................    71

EXPERTS.............................................................................    71

ADDITIONAL MATTERS FOR MIDWEST'S ANNUAL MEETING.....................................    72

SHAREHOLDER/STOCKHOLDER PROPOSALS...................................................    78

CAUTIONARY STATEMENT CONCERNING FORWARD-LOOKING STATEMENTS..........................    79

WHERE YOU CAN FIND MORE INFORMATION.................................................    80

INDEX TO FINANCIAL STATEMENTS.......................................................    F-1
</TABLE>

ANNEXES:

Annex I    --   Agreement and Plan of Merger, dated as of February 2, 1999,
                by and between Mahaska and Midwest

Annex II   --   Letter Agreement, dated as of February 2, 1999, between Mahaska
                and Midwest

Annex III  --   Opinion of Howe Barnes Investments, Inc.

Annex IV   --   Opinion of Charles Webb & Company

Annex V    --   Section 490.1301 et. seq. of the Iowa Business Corporations Act

Annex VI   --   Section 262 of the Delaware General Corporation Law


                                     -iii-
<PAGE>   15
                                     SUMMARY

         This summary highlights selected information from this joint proxy
statement/prospectus. To understand the merger fully and for a more complete
description of the legal terms of the merger, you should read carefully this
entire joint proxy statement/prospectus, including the merger agreement and the
other annexes, as well as the other documents referred to in this joint proxy
statement/prospectus.

THE COMPANIES

Mahaska Investment Company
222 First Avenue East
Oskaloosa, Iowa 52577
(515) 673-8448

         Mahaska is an Iowa corporation and a bank holding company registered
under the Bank Holding Company Act of 1956. Mahaska, headquartered in Oskaloosa,
Iowa, offers banking and commercial finance services through eight locations in
six south central Iowa communities. Mahaska's subsidiaries consist of three
financial institutions, Mahaska State Bank, Central Valley Bank and Pella State
Bank and On-Site Credit Services, Inc., a finance company. As announced on April
23, 1999, Mahaska has elected to seek a buyer for On-Site Credit Services, Inc.,
its commercial finance subsidiary. While Mahaska's management believes there
appears to be sufficient demand for commercial finance services, On-Site has not
generated an adequate return on investment for Mahaska.

         The principal business of Mahaska consists of commercial banking and
related financial services, providing the usual products and services such as
deposits, commercial, real estate and consumer loans and trust services. In
addition, Mahaska invests in loan pool participations comprised of packages of
loans previously made by other financial institutions that have been auctioned
off by federal regulators or by other parties at prices reflecting varying
discounts from the aggregate principal amount of the underlying loans.

Midwest Bancshares, Inc.
3225 Division Street
Burlington, Iowa 52601
(319) 754-6526

         Midwest is a Delaware corporation and a unitary savings and loan
holding company registered under the Home Owners' Loan Act. Midwest is the
parent holding company of Midwest Federal Savings and Loan Association of
Eastern Iowa, a federally-chartered savings bank. Midwest Federal Savings
conducts business through two locations in Burlington, Iowa and one location
each in West Burlington, Ft. Madison and Wapello, Iowa. The principal business
of Midwest Federal Savings consists of attracting retail deposits from the
general public and using such deposits and other funds to originate loans
secured by first mortgage liens on
<PAGE>   16
residential properties. Midwest Federal Savings also invests in mortgage-backed
securities, a substantial portion of which are insured or guaranteed by federal
agencies.

THE MERGER

         Mahaska and Midwest propose to combine their two companies by merging
Midwest with and into Mahaska. Mahaska will be the surviving corporation of this
merger. Midwest Federal Savings will become a wholly-owned subsidiary of
Mahaska.

EXCHANGE RATIO

         Midwest stockholders will receive one share of Mahaska common stock for
each share of Midwest common stock that they own.

COMPARATIVE PER SHARE MARKET PRICE INFORMATION

         Shares of Mahaska trade on the Nasdaq National Market and shares of
Midwest trade on the Nasdaq SmallCap Market. On February 2, 1999, the last
trading day preceding public announcement of the merger, Mahaska common stock
closed at $17.00 per share and Midwest common stock closed at $11.625 per share.
On _____________, 1999, Mahaska common stock closed at $____ per share and
Midwest common stock closed at $____ per share.

         The market value of shares of Midwest common stock was $17.00 based on
Mahaska's February 2, 1999 closing price and $______ based on Mahaska's
___________, 1999 closing price. Because the market price of Mahaska common
stock will fluctuate prior to and after completion of the merger and the
exchange ratio is fixed, Midwest stockholders cannot be sure of the market value
of the Mahaska shares they will receive in the merger. You should obtain current
stock quotations for Mahaska common stock and Midwest common stock. You can get
these quotes from a newspaper, on the internet or by calling your broker.

REASONS FOR THE MERGER

         The merger will combine the strengths of the individual companies and
substantially enhance the combined company's operations in the State of Iowa. We
expect that the combined company will have more opportunities to increase
earnings by providing a broader range of products and services to Mahaska's and
Midwest's customers and by reducing costs by eliminating overlapping functions
and processes. We believe that the combined company will maximize long-term
shareholder value while serving the interests of customers, employees and the
communities which it serves.

THE MEETINGS

         The special meeting of Mahaska's shareholders will be held at 2:00
p.m., central time, on ____________, 1999, at the Elmhurst Country Club, 2214
South 11th Street, Oskaloosa, Iowa


                                      -2-
<PAGE>   17
52577. At the Mahaska special meeting, Mahaska shareholders will be asked to
approve the merger agreement between Mahaska and Midwest.

         The annual meeting of Midwest's stockholders will be held at 2:00 p.m.,
central time, on ___________, 1999, at 3225 Division Street, Burlington, Iowa
52601. At the Midwest annual meeting, Midwest stockholders will be asked to
adopt the merger and the merger agreement, elect two directors and ratify the
selection of the outside auditors.

RECOMMENDATIONS OF THE BOARD OF DIRECTORS OF MAHASKA AND MIDWEST

         The board of directors of Mahaska believes that the merger is fair and
in the best interests of Mahaska and its shareholders and unanimously recommends
that shareholders of Mahaska vote "FOR" approval of the merger agreement.

         The board of directors of Midwest believes that the merger is fair and
in the best interests of Midwest and its stockholders and unanimously recommends
that stockholders of Midwest vote "FOR" the adoption of the merger agreement.

RECORD DATES; VOTING POWER

         Mahaska shareholders are entitled to vote at the Mahaska special
meeting if they owned Mahaska common stock as of the close of business on
_________, 1999. Mahaska shareholders will have one vote at the Mahaska special
meeting for each share of Mahaska common stock owned on _________, 1999.

         Midwest stockholders are entitled to vote at the Midwest annual meeting
if they owned Midwest common stock as of the close of business on _________,
1999. Midwest stockholders will have one vote at the Midwest annual meeting for
each share of Midwest common stock owned on _________, 1999.

VOTES REQUIRED

         The holders of a majority of the outstanding shares of Mahaska common
stock must vote in favor of the merger agreement. The directors and executive
officers of Mahaska can cast approximately 22.6% of the votes entitled to be
cast at the Mahaska special meeting. It is anticipated that the directors will
vote all of their shares in favor of the merger and the related merger
agreement.

         The holders of a majority of the outstanding shares of Midwest common
stock must vote in favor of the merger agreement. The directors and executive
officers of Midwest can cast approximately 34.3% of the votes entitled to be
cast at the Midwest annual meeting. It is anticipated that the directors will
vote all of their shares in favor of the merger agreement.


                                      -3-
<PAGE>   18
OWNERSHIP OF MAHASKA FOLLOWING THE MERGER

         Mahaska will issue up to 1,119,473 shares of Mahaska common stock to
Midwest stockholders in the merger (including shares which may be issued in
exchange for Midwest common stock acquired before the merger upon exercise of
outstanding Midwest stock options). If 1,119,473 shares of Mahaska common stock
are issued in the merger, Midwest stockholders will own approximately 23.5% of
the outstanding Mahaska common stock. This information is based on the number of
shares of Mahaska common stock and Midwest common stock and assuming all of the
14,125 Midwest stock options outstanding on May 21, 1999 are exercised prior
to the merger taking place.

OPINIONS OF FINANCIAL ADVISORS

         In deciding to approve the merger agreement, the board of directors of
Mahaska considered the opinion of its financial advisor, Howe Barnes
Investments, Inc., that the proposed exchange ratio was fair, from a financial
point of view, to Mahaska shareholders.

         Similarly, in deciding to approve the merger agreement, the board of
directors of Midwest considered the opinion of its financial advisor, Charles
Webb & Company, that the proposed exchange ratio was fair, from a financial
point of view, to Midwest stockholders.

         The written opinions of Howe Barnes Investments, Inc. and Charles Webb
& Company, each dated February 2, 1999, are attached as Annexes III and IV to
this joint proxy statement/prospectus. Both opinions have been updated as of the
date of this joint proxy statement/prospectus. You are urged to read these
opinions carefully to understand the assumptions made, matters considered and
limitations of the review undertaken by the financial advisors.

EXCHANGE OF MIDWEST STOCK CERTIFICATES

         Please do not send in your Midwest stock certificates with your proxy.
After the merger is consummated, you will receive a letter of transmittal which
will explain the process for the exchange of Midwest stock certificates.

CONDITIONS TO COMPLETION OF THE MERGER

         The completion of the merger depends on meeting a number of conditions,
including the following:

                  -        Mahaska shareholders must approve and Midwest
                           stockholders must adopt the merger agreement;

                  -        Mahaska and Midwest must have received all required
                           regulatory approvals for the merger and any waiting
                           periods required by law must have passed;


                                      -4-
<PAGE>   19
                  -        there must be no law or governmental order preventing
                           completion of the merger, and no proceedings by a
                           governmental entity trying to prevent the merger
                           shall be pending;

                  -        there shall have been no material adverse change in
                           the results of operations, conditions (financial or
                           otherwise), properties, assets or business of Mahaska
                           or its subsidiaries;

                  -        each of Mahaska and Midwest must have received a
                           legal opinion regarding the merger;

                  -        the accuracy in all material respects of the
                           representation and warranties of Mahaska and Midwest
                           set forth in the merger agreement;

                  -        no more than 8% of Midwest stockholders exercising
                           appraisal rights;

                  -        the Mahaska common stock to be issued in the merger
                           has been approved for trading on the Nasdaq National
                           Market; and

                  -        Mahaska and Midwest must receive a letter from their
                           independent public accountants stating that the
                           merger will qualify for "pooling of interests"
                           accounting treatment and tax-free reorganization
                           federal taxation treatment.

TERMINATION OF THE MERGER AGREEMENT

         Mahaska and Midwest can agree at any time to terminate the merger
agreement before completing the merger. Either company also can terminate the
merger agreement:

                  -        if the merger is not completed by September 30, 1999;

                  -        if the Mahaska shareholders or Midwest stockholders
                           do not approve the merger agreement; or

                  -        if the other company violates, in a material way, any
                           of its representations, warranties or obligations
                           under the merger agreement.

Mahaska may terminate the merger agreement if the board of directors of Midwest
does not maintain its favorable recommendation to its stockholders that the
merger agreement be adopted, or otherwise adversely changes its recommendation,
thereby breaching Midwest's obligations under the merger agreement. Midwest may
terminate the merger agreement if the board of directors of Mahaska does not
maintain its favorable recommendation to its shareholders that the merger
agreement be approved, or otherwise adversely changes its recommendation,
thereby breaching Mahaska's obligations under the merger agreement.


                                      -5-
<PAGE>   20
BOARD OF DIRECTORS AND MANAGEMENT OF MAHASKA FOLLOWING THE MERGER

         After the merger, the board of directors of Mahaska will consist of its
existing directors and William D. Hassel, President and Chief Executive Officer
of Midwest bringing the total number of directors to nine. Charles S. Howard,
President of Mahaska and David A. Meinert, Executive Vice President and Chief
Financial Officer of Mahaska will join the existing board of Midwest Federal
Savings, raising its total to nine directors.

INTERESTS OF DIRECTORS AND EXECUTIVE OFFICERS OF MIDWEST IN THE MERGER

         Immediately following the merger, William D. Hassel and Robert D.
Maschmann, Executive Vice President and Chief Financial Officer of Midwest, will
have agreements that provide them with interests in the merger that are
different from, or in addition to, their interests as Midwest stockholders.
Midwest Federal Savings will enter into employment agreements with these
executive officers of Midwest, which generally give them the right to receive
severance payments equal to up to three times that person's then-applicable
annual salary in the event that their employment is terminated in connection
with a subsequent change of control. In addition, each will receive a payment
upon completion of the merger for foregoing certain rights under existing
agreements.

REGULATORY APPROVALS

         The completion of the merger requires the prior approval of the Office
of Thrift Supervision, the Federal Reserve and the Federal Deposit Insurance
Corporation. Moreover, the U.S. Department of Justice may provide input into the
approval process of the Federal Reserve, the Office of Thrift Supervision and
the Federal Deposit Insurance Corporation and will have no less than 15 and up
to 30 days following any approvals of those agencies to challenge these
approvals on antitrust grounds.

         Mahaska and Midwest cannot predict whether the required regulatory
approvals will be obtained or whether any approvals will have conditions which
would be detrimental to Mahaska upon consummation of the merger.

FEDERAL INCOME TAX CONSEQUENCES

         Midwest's stockholders generally will not recognize any gain or loss
for federal income tax purposes when they exchange their Midwest shares for
Mahaska shares.

         This tax treatment may not apply to certain stockholders. Determining
the actual tax consequences of the merger to you as an individual taxpayer can
be complicated. The tax treatment will depend on your specific situation and
many variables not within the control of Mahaska and Midwest. You should consult
your own tax advisor for a full understanding of the merger's tax consequences.


                                      -6-
<PAGE>   21
ACCOUNTING TREATMENT

         It is expected that the merger will qualify as a "pooling of
interests," which means that, for accounting and financial reporting purposes,
Mahaska and Midwest will be treated as if they had always been one company.
Mahaska or Midwest may terminate the merger agreement if they do not receive a
letter from their independent public accountants that the merger will qualify as
a pooling of interests.

APPRAISAL RIGHTS

         Iowa law permits holders of Mahaska common stock to dissent from the
merger and to have the fair value of their Mahaska common stock appraised and
paid to them in cash. To do this, a holder of Mahaska common stock must follow
certain procedures, including filing notices with Mahaska and not voting in
favor of the merger agreement.

         Delaware law permits holders of Midwest common stock to dissent from
the merger and to have the fair value of their Midwest common stock appraised
and paid to them in cash. To do this, a holder of Midwest common stock must
follow certain procedures, including filing notices with Midwest and not voting
in favor of the merger agreement.


                                      -7-
<PAGE>   22
                           COMPARATIVE PER SHARE DATA

         The following table shows summarized historical per share, pro forma
combined per share and pro forma equivalent per share information regarding the
Mahaska common stock and the Midwest common stock at the dates and for the
periods indicated, giving effect to the merger using the pooling of interests
method of accounting, assuming that the merger was consummated as of the
beginning of each of the periods indicated. See "The Merger Agreement-Accounting
Treatment of the Merger" and "Pro Forma Financial Information."

         The data set forth below does not reflect cost savings, operating
synergies and revenue enhancements which may be realized as a result of the
merger. The selected per share data set forth below should be read in
conjunction with, and is qualified in its entirety by, the historical
consolidated financial statements of Mahaska and Midwest, including the related
notes and the pro forma combined consolidated financial information appearing
elsewhere herein. See "Where You Can Find More Information" and "Pro Forma
Financial Information." The data set forth below is not necessarily indicative
of the results of the future operations of Mahaska upon consummation of the
merger or the actual results that would have been achieved had the merger been
consummated prior to the periods indicated.


                                      -8-
<PAGE>   23
<TABLE>
<CAPTION>
                                               Mahaska          Midwest            Pro Forma
                                              Historical       Historical          Combined (1)
                                              ----------       ----------          ------------
<S>                                           <C>              <C>                 <C>
Basic net earnings per share:
  Three Months ended March 31, 1999            $ 0.32            $ 0.31               $ 0.32
  Year ended December 31, 1998                   1.26              1.31                 1.27
  Year ended December 31, 1997                   1.38              1.23                 1.35
  Year ended December 31, 1996                   1.20              0.59                 1.07

Diluted net earnings per share:

  Three Months ended March 31, 1999              0.31              0.30                 0.31
  Year ended December 31, 1998                   1.20              1.25                 1.21
  Year ended December 31, 1997                   1.33              1.14                 1.29
  Year ended December 31, 1996                   1.19              0.56                 1.05

Dividends declared per share(2):

  Three Months ended March 31, 1999              0.15              0.00(3)              0.15
  Year ended December 31, 1998                   0.56              0.34                 0.56
  Year ended December 31, 1997                   0.48              0.22                 0.48
  Year ended December 31, 1996                   0.44              0.19                 0.44

Book value per share(4):
  March 31, 1999 (5)                            10.65             11.25                10.61

Tangible book value per share(6):
  March 31, 1999 (5)                             9.17             11.25                 9.47
</TABLE>


(1)      The pro forma equivalent per share data of Midwest common stock equals
         the pro forma combined per share data of Mahaska common stock because
         the exchange ratio is one-to-one.

(2)      The pro forma combined dividends declared per share of Mahaska common
         stock is assumed to be the historical dividends declared per share of
         Mahaska common stock.

(3)      Midwest delayed declaration of a dividend ($0.11) until April 1999 in
         accordance with the merger agreement.

(4)      The pro forma combined book value per share of Mahaska common stock is
         based upon the historical total stockholders' equity for Mahaska and
         Midwest, divided by the pro forma combined period-end shares of Mahaska
         common stock outstanding.

(5)      Pro forma combined book value and tangible book value per share at
         March 31,1999 reflect a one-time, after tax charge of $875,000 which is
         estimated by Mahaska to be recorded by it in connection with the
         consummation of the merger.

(6)      The pro forma combined tangible book value per share of Mahaska common
         stock is based upon the historical total stockholders' equity for
         Mahaska and Midwest, less goodwill and other intangibles, divided by
         the pro forma combined period-end shares of Mahaska common stock
         outstanding.


                                      -9-
<PAGE>   24
         Set forth below is information regarding the closing price per share of
Mahaska common stock and Midwest common stock on (a) February 2, 1999, the last
trading day preceding public announcement of the execution of the merger
agreement, and (b) May 21, 1999. The historical prices are as reported on the
Nasdaq National Market or Nasdaq SmallCap Market.

<TABLE>
<CAPTION>
                             Historical Market
                              Value Per Share
                              ---------------
                                                            Equivalent Market Value Per
     DATE                  OSKY               MWBI               Share of MWBI (1)
<S>                        <C>               <C>            <C>
February 2, 1999           $17.00            $11.625                       $17.00

May 21, 1999               $15.25            $17.375                       $15.25
</TABLE>

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

(1)      Equivalent market value per share of Midwest common stock represents
         the historical market value per share of Mahaska common stock
         multiplied by the exchange ratio.

         We advise you to obtain current market quotations for the Mahaska
common stock and the Midwest common stock. Because the consideration to be
provided to stockholders of Midwest in connection with the merger is based on a
fixed number of shares of Mahaska common stock, stockholders of Midwest are not
assured of receiving a specific market value of Mahaska common stock, and thus a
specific market value for their shares of Midwest common stock, at the effective
time of the merger. The market value of the Midwest common stock at the
effective time of the merger may be higher or lower than the market value at the
time the merger agreement was executed, at the date of mailing of this joint
proxy statement/prospectus or at the time of the meetings.


                                      -10-
<PAGE>   25
                SELECTED CONSOLIDATED FINANCIAL DATA OF MAHASKA

         The following selected historical consolidated financial data of
Mahaska as of and for the three months ended March 31, 1999 and 1998 and as of
and for each of the five years ended December 31, 1998 is based on the
consolidated financial statements of Mahaska. The data has been restated to
reflect the five-for-three stock split effected in the form of a stock dividend
in November 1997. The selected historical consolidated financial data set forth
below should be read in conjunction with, and is qualified in its entirety by,
the historical consolidated financial statements of Mahaska, including the
related notes, appearing elsewhere herein. See "Where You Can Find More
Information."

<TABLE>
<CAPTION>
                                                 Three Months Ended                     Year Ended December 31
                                                     March 31,         ------------------------------------------------------------
                                                  1999       1998        1998         1997         1996         1995         1994
                                               --------    --------    --------     --------     --------     --------     --------
                                                                        (dollars in thousands, except per share data)
<S>                                            <C>         <C>         <C>          <C>          <C>          <C>          <C>
SUMMARY OF INCOME DATA:
  Interest income excluding loan pool
    participations .........................   $  4,540    $  4,170    $ 17,996     $ 15,483     $ 13,532     $ 10,463     $  8,500
  Interest and discount on loan pool
    participations .........................      2,209       2,464       7,970        8,474        9,097        7,864        4,479
  Total interest income ....................      6,749       6,634      25,966       23,957       22,629       18,327       12,979
  Total interest  expense ..................      2,701       2,512      10,490        9,312        8,531        7,100        4,676
  Net interest income ......................      4,048       4,122      15,476       14,645       14,098       11,227        8,303
  Provision for loan losses ................        167         110       1,179          417          987          168          183
  Other income .............................        492         441       1,857        1,739        1,506        1,301        1,457
  Other expenses ...........................      2,555       2,207       8,948        8,315        7,738        6,450        5,452
  Income before income tax .................      1,818       2,246       7,206        7,652        6,879        5,910        4,125
  Income tax expense .......................        661         816       2,583        2,594        2,385        1,987        1,345
  Net income ...............................      1,157       1,430       4,623        5,058        4,494        3,923        2,780

PER SHARE DATA:
  Net income - basic .......................   $   0.32    $   0.39    $   1.26     $   1.38     $   1.20     $   1.03     $   0.99
  Net income - diluted .....................       0.31        0.37        1.20         1.33         1.19         1.03         0.99
  Cash dividends declared ..................       0.15        0.14        0.56         0.48         0.44         0.40         0.36
  Book value ...............................      10.65       10.28       10.51        10.03         9.22         8.49         7.82
  Tangible book value ......................       9.17        8.64        8.99         8.35         7.39         7.34         6.56


SELECTED FINANCIAL RATIOS:
  Net income to average assets .............       1.59%(1)    2.13%(1)    1.65%        1.98%        1.93%        2.04%        1.68%
  Net income to average equity .............      12.22 (1)   15.51 (1)   12.16        14.47        13.52        12.67        12.45
  Dividend payout ratio ....................      46.88       35.90       44.44        34.78        36.50        38.45        36.27
  Average equity to average assets .........      12.98       13.76       13.54        13.69        14.31        16.09        13.46
  Tier 1 capital to risk weighted assets  at
    end of period ..........................      14.31       15.61       14.02        14.74        16.25        19.84        19.92
  Net interest margin ......................       6.04        6.73        6.04         6.31         6.69         6.48         5.58
</TABLE>


                                      -11-
<PAGE>   26
<TABLE>
<S>                                            <C>         <C>         <C>          <C>          <C>          <C>          <C>
  Gross revenue of loan pool participations
    to total gross revenue .................      30.51       34.82       28.64        32.98        37.69        40.06        31.03
  Interest and discount income of loan pool
    participations to total interest income       32.73       37.14       30.69        35.37        40.20        42.91        34.51
  Allowance for loan losses to total loans .       1.18        1.27        1.32         1.26         1.27         1.17         1.19
  Non-performing loans to total loans ......       1.45        1.26        0.85         1.28         1.79         0.81         0.79
  Net loans charged off to average loans ...       0.74        0.15        0.52         0.07         0.63         0.06         0.20
</TABLE>


<TABLE>
<CAPTION>
                                           March 31,                         At December 31
                                          ------------------------------------------------------------------------------------
                                             1999           1998           1997           1996           1995           1994
                                           --------       --------       --------       --------       --------       --------
                                                                              (in thousands)
<S>                                        <C>            <C>            <C>            <C>            <C>            <C>
SELECTED BALANCE SHEET DATA:
Total assets .......................       $299,255       $298,389       $274,873       $251,851       $205,162       $186,818
Total loans net of unearned discount        172,198        165,427        144,333        117,416         85,882         74,015
Total loan pool participations .....         50,536         54,510         54,326         50,687         45,318         46,852
Allowance for loan losses ..........          2,037          2,177          1,816          1,491          1,001            881
Total deposits .....................        233,529        232,733        215,308        206,952        161,505        146,476
Total shareholders' equity .........         38,744         38,232         36,754         34,243         32,106         29,780
</TABLE>

- --------------------
(1)  Annualized.

                                      -12-
<PAGE>   27
                SELECTED CONSOLIDATED FINANCIAL DATA OF MIDWEST

         The following selected historical consolidated financial data of
Midwest as of and for the three months ended March 31, 1999 and 1998 and as of
and for each of the five years ended December 31, 1998 is based on the
consolidated financial statements of Midwest. The data has been restated to
reflect the three-for-one stock split effected in the form of a stock dividend
in October 1997. The selected historical consolidated financial data set forth
below should be read in conjunction with, and is qualified in its entirety by,
the historical consolidated financial statements of Midwest, including the
related notes, appearing elsewhere herein. See "Where You Can Find More
Information."

<TABLE>
<CAPTION>
                                               Three Months Ended
                                                    March 31,                             Year Ended December 31
                                               ------------------          ------------------------------------------------------
                                               1999          1998          1998        1997           1996         1995      1994
                                               ----          ----          ----        ----           ----         ----      ----
                                                                   (dollars in thousands, except per share data)
<S>                                          <C>           <C>           <C>         <C>            <C>            <C>      <C>
SUMMARY OF INCOME DATA:

  Interest income - loans .................  $ 1,907       $ 1,848       $ 7,537     $ 7,075        $ 6,444        5,799    $ 5,242
  Interest income - securities ............      950           963         3,805       3,675          3,719        3,774      3,598
  Total interest income ...................    2,857         2,811        11,342      10,750         10,163        9,573      8,840
  Total interest  expense .................    1,783         1,771         7,227       6,720          6,243        5,713      4,864
  Net interest income .....................    1,074         1,040         4,115       4,030          3,920        3,860      3,976
  Provision for loan losses ...............       12            12            48          48             48           48         42
  Non-interest income .....................      106           124           664         553            349          847        235
  Total non-interest expenses .............      715           692         2,810       2,581          3,217        2,629      2,554
  Income before income tax ................      453           460         1,921       1,954          1,004        2,030      1,615
  Income tax expense ......................      118           149           549         689            374          680        545
  Net income ..............................      335           311         1,372       1,265            630        1,350      1,070

PER SHARE DATA:
  Net income - basic ......................  $  0.31       $  0.30       $  1.31     $  1.23        $  0.59         1.20    $  0.86
  Net income - diluted ....................     0.30          0.28          1.25        1.14           0.56         1.14       0.83
  Cash dividends declared .................     0.00 (1)      0.07          0.34        0.22           0.19         0.17       0.16
  Book value ..............................    11.25         10.63         11.17       10.46           9.16         8.94       7.55
  Tangible book value .....................    11.25         10.63         11.17       10.46           9.16         8.94       7.55

SELECTED FINANCIAL RATIOS:
  Net income to average assets ............     0.77%(2)      0.75%(2)      0.86%       0.87%          0.46%(3)     1.02%      0.81%
  Net income to average equity ............    10.32 (2)     10.78(2)      12.07       12.56           6.59(3)     14.73      11.96
  Dividend payout ratio ...................    35.50         23.30         25.95       17.89          33.33(3)     14.75      19.35
  Average equity to average assets ........     7.48          6.94          7.16        6.95           6.93         6.89       6.79
  Tier 1 capital to risk weighted assets
    at end of period ......................    15.77         14.56         14.86       13.97          14.73        17.34      17.61
  Net interest margin .....................     2.85          2.80          2.83        2.89           2.94         2.99       3.11
</TABLE>


                                      -13-
<PAGE>   28
<TABLE>
<S>                                          <C>           <C>           <C>         <C>            <C>            <C>      <C>
  Allowance for loan losses to total loans      0.52          0.50          0.50        0.61           0.82         0.87       0.90
  Non-performing loans to total loans .....     0.15          0.42          0.18        0.83           1.34         0.07       0.23
  Net loans charged off to average loans ..     0.00          0.13          0.14        0.19           0.05         0.03       0.06
</TABLE>


<TABLE>
<CAPTION>
                                              March 31,                             At December 31
                                             -----------------------------------------------------------------------------------
                                               1999           1998           1997           1996           1995           1994
                                             --------       --------       --------       --------       --------       --------
                                                                               (in thousands)
<S>                                          <C>            <C>            <C>            <C>            <C>            <C>
SELECTED BALANCE SHEET DATA:
  Total assets .......................       $164,983       $162,318       $147,724       $136,425       $132,964       $131,260
  Total loans net of unearned discount         94,984         96,828         91,844         81,911         74,711         70,994
  Allowance for loan losses ..........            492            480            568            686            676            650
  Total deposits .....................        107,534        105,982        105,278        101,918        101,334        106,894
  Total stockholders' equity .........         12,354         12,035         10,675          9,600          9,896          9,283
</TABLE>

- --------------------
(1)      Midwest delayed declaration of a dividend ($0.11) until April 1999 in
         accordance with the merger agreement.

(2)      Annualized.

(3)      Excluding the SAIF assessment, Midwest's return on assets, return on
         equity, and dividend payout ratio for the year ended December 31, 1996
         would have been 0.76%, 11.03% and 20.07%, respectively.


                                      -14-
<PAGE>   29
SELECTED PRO FORMA CONSOLIDATED FINANCIAL DATA

         The following table sets forth selected consolidated pro forma
financial data of Mahaska and Midwest for the periods indicated, giving effect
to the merger using the pooling of interests method of accounting, assuming that
the merger was consummated as of the beginning of each of the periods presented.
The selected balance sheet data and ratios as of March 31, 1999 in the following
table reflects the combined historical balance sheet data of Mahaska and Midwest
after giving effect to certain pro forma adjustments, including estimated
merger-related costs, assuming the merger was consummated as of March 31, 1999.
See "The Merger Agreement - Accounting Treatment of the Merger" and "Pro Forma
Financial Information." The selected consolidated financial data set forth below
should be read in conjunction with, and is qualified in its entirety by, the
historical consolidated financial statements of Mahaska and Midwest, including
the related notes and the other pro forma financial information appearing
elsewhere herein. See "Where You Can Find More Information" and "Pro Forma
Financial Information." The data set forth below does not reflect cost savings,
operating synergies and revenue enhancements which may be realized as a result
of the merger. The data set forth below is not necessarily indicative of the
results of the future operations of Mahaska after the merger or the actual
results that would have been achieved had the merger been consummated prior to
the periods indicated.

<TABLE>
<CAPTION>
                                                    Three Months Ended
                                                         March 31,                           Year Ended December 31
                                                   --------------------------------------------------------------------------------
                                                     1999        1998        1998        1997        1996        1995        1994
                                                   --------    --------    --------    --------    --------    --------    --------
                                                                     (dollars in thousands, except per share data)
<S>                                                <C>         <C>         <C>         <C>         <C>         <C>         <C>
SUMMARY OF INCOME DATA:
  Interest income excluding loan pool
    participations .............................   $  7,397    $  6,981    $ 29,338    $ 26,233    $ 23,695    $ 20,036    $ 17,340
  Interest and discount on loan pool
    participations .............................      2,209       2,464       7,970       8,474       9,097       7,864       4,479
  Total interest income ........................      9,606       9,445      37,308      34,707      32,792      27,900      21,819
  Total interest  expense ......................      4,484       4,283      17,717      16,032      14,774      12,813       9,540
  Net interest income ..........................      5,122       5,162      19,591      18,675      18,018      15,087      12,279
  Provision for loan losses ....................        179         122       1,227         465       1,035         216         225
  Other income .................................        598         565       2,521       2,292       1,855       2,148       1,692
  Total other operating expenses ...............      3,270       2,899      11,758      10,896      10,955       9,079       8,006
  Income before income tax .....................      2,271       2,706       9,127       9,606       7,883       7,940       5,740
  Income tax expense ...........................        779         965       3,132       3,283       2,759       2,667       1,890
  Net income ...................................      1,492       1,741       5,995       6,323       5,124       5,273       3,850

PER SHARE DATA:

  Net income - basic ...........................   $   0.32    $   0.37    $   1.27    $   1.35    $   1.07    $   1.07    $   0.95
  Net income - diluted .........................       0.31        0.35        1.21        1.29        1.05        1.06        0.94
  Cash dividends declared ......................       0.15        0.14        0.56        0.48        0.44        0.40        0.36

</TABLE>


                                      -15-
<PAGE>   30
<TABLE>
<CAPTION>
SELECTED FINANCIAL RATIOS:
<S>                                                <C>         <C>         <C>         <C>         <C>         <C>         <C>
  Net income to average assets .................       1.32%(1)    1.65%(1)    1.37%       1.58%       1.39%       1.62%       1.30%
  Net income to average equity .................      12.16 (1)   14.92 (1)   12.36       14.32       12.23       13.43       12.69
  Dividend payout ratio ........................      47.57       37.79       43.98       35.57       41.27       37.36       37.87
  Net interest margin ..........................       4.91 (1)    5.30 (1)    4.85        5.03        5.25        5.01        4.46
  Gross revenue of loan pools to total  gross
    revenue ....................................      21.65       24.62       20.01       22.90       26.26       26.17       19.05
  Interest and discount income of loan  pools to
    total interest income ......................      23.00       26.09       21.36       24.42       27.74       28.19       20.53
  Non-performing loans to total loans ..........       0.99        0.93        0.67        1.24        1.62        0.47        0.72
  Net loans charged off to average loans .......       0.12        0.07        0.38        0.12        0.38        0.05        0.13
</TABLE>

<TABLE>
<CAPTION>
                                             March 31,
                                               1999
                                             --------
                                             (dollars in thousands, except per share data)
<S>                                          <C>
SELECTED BALANCE SHEET DATA AND RATIOS(2):
  Total assets .......................       $463,838
  Total loans net of unearned discount        267,182
  Total loan pool participations .....         50,536
  Allowance for loan losses ..........          2,929
  Total deposits .....................        341,063
  Total stockholders' equity .........         50,223
  Book value per share ...............          10.61
  Tangible book value per share ......           9.47
  Average equity to average assets ...          10.84%
  Tier 1 capital to risk weighted
    assets  at end of period .........          14.50
  Allowance for loan losses to total
  loans ..............................           1.10
</TABLE>

(1)  Annualized.

(2)  The selected balance sheet data and ratios reflect a one-time after-tax
charge of $875,000 which is estimated by Mahaska to be recorded by it in
connection with the consummation of the merger.

                                      -16-
<PAGE>   31
                                  RISK FACTORS

         In addition to the other information in this joint proxy
statement/prospectus, these factors should be given careful consideration by
shareholders of both Mahaska and Midwest in evaluating the merger.

RISKS SPECIFIC TO THE MERGER

         IF MAHASKA'S TRADING PRICE DECREASES, THE VALUE RECEIVED BY MIDWEST
STOCKHOLDERS WILL ALSO DECREASE. The exchange ratio is fixed. It will not change
even if the price of Mahaska common stock changes after the date of this joint
proxy statement/prospectus. As a result, the dollar value of the Mahaska common
stock received by Midwest stockholders will fluctuate based on the market price
of Mahaska common stock. Midwest stockholders should obtain the current market
price of Mahaska common stock before delivering their proxy. You can find the
price of Mahaska common stock on a recent date under "Comparative Per Share
Data."

         PROSPECTS OF MAHASKA AFTER THE MERGER ARE CURRENTLY UNKNOWN DUE TO THE
RISKS OF INTEGRATION OF THE TWO COMPANIES. The banking and financial services
industry is highly competitive. If an undetermined number of present customers
of Mahaska and Midwest are not retained by Mahaska after the merger or
additional expenses are incurred in keeping them, this could have a negative
effect on future results for Mahaska. Continuing profitability for Mahaska will
depend in part on maintaining the revenues of Mahaska's combined financial
institution subsidiaries after the merger.

         There is a risk that the integration of the operations of Midwest
Federal Savings may not be completed on schedule or may be more difficult and
costly than expected. Neither Mahaska nor Midwest can give any assurances that
Mahaska and its financial institution subsidiaries will be able to realize the
benefits anticipated to be received after the merger because of uncertainties
after the merger.

RISKS SPECIFIC TO THE COMPANIES

         MAHASKA'S INVESTMENT IN LOAN POOL PARTICIPATIONS CONTAIN RISKS THAT
DIFFER FROM THOSE OF TRADITIONAL BANKING. A significant portion of Mahaska's
earning assets are, and a significant portion of its income results from, loan
pool participations. As of December 31, 1998, Mahaska had loan pool
participations totaling approximately $54.5 million, which was 19.7% of total
earning assets as of that date. For the year ended December 31, 1998, interest
income and discount from loan pool participations constituted 30.7% of total
interest income. Loan pool participations are accounted for on a nonaccrual (or
cash) basis.

         The assets consist of various performing and non-performing loans of
various credit quality. The assets underlying the loan pool participations
consist of commercial, commercial real estate, residential real estate,
consumer, automobile, mobile home and various other types of collateral,
including real estate acquired through foreclosure. Although the principal
amount of


                                      -17-
<PAGE>   32
the loans underlying the loan pool participations are recorded and held on the
books of the independent servicer below face value and this discounted value is
reflected in the carrying value on Mahaska's books of its investments in loan
pool participations, risks are still associated with these loans. These risks
include:

                  -        the independent loan servicer's ability to locate the
                           debtors and the collateral, if any;

                  -        each debtor's financial condition;

                  -        the possibility that a debtor may file for protection
                           under applicable bankruptcy laws or that a debtor may
                           assert rights, or a state agency may bring claims,
                           against the independent servicer under various state
                           consumer credit, fair debt collection,
                           truth-in-lending, or other consumer protection laws;

                  -        the ability of the independent servicer to obtain
                           possession of the collateral, if any, and to realize
                           any value from such collateral; and

                  -        the length of time needed to realize any ultimate
                           recovery either through collection procedures or
                           through a resale of the loans.

During 1998, Mahaska invested approximately $25.7 million in new loan pool
participations. The loans underlying these recently purchased loan pool
participations are higher quality loans than Mahaska has previously purchased.
Mahaska is experiencing a transition of available assets to purchase from
nonperforming, mixed types of loans to significantly higher quality performing
loans with a higher percentage secured with residential real estate. Mahaska
intends to continue to purchase interests in loan pool participations to the
extent loan packages continue to become available at prices deemed acceptable by
management.

         Mahaska's experience has been that income on any newly acquired loan
pool participations may not begin immediately upon purchase. The receipt of
income is delayed due to the time required by the independent servicer to review
loan files, transfer security interests, obtain appraisals or otherwise
ascertain collateral value, contact borrowers, and to notify the borrowers to
redirect their payments to the servicer. The period of time required for a loan
pool participation to start producing a return varies from approximately one to
four months depending upon the size of the loan pool participation, the
complexity of the loans acquired, the quality of the loans acquired, and the
type of loans acquired.

         The loan pool participations are serviced by the independent servicer
who is the primary provider of due diligence activities, as well as being
responsible for collections and accounting with respect to the loan pool
participations. Mahaska is dependent on the independent servicer and its
management to evaluate potential loan pool participation investments and to
service loan pool participations purchased. There is no assurance that adequate
replacements could be found for the independent servicer in the event it stops
servicing the loans.


                                      -18-
<PAGE>   33
         COMPETITION MAY ADVERSELY AFFECT MAHASKA'S GROWTH. Mahaska competes in
the commercial banking and thrift industries through its subsidiary financial
institutions. These industries are highly competitive, and all the financial
institution subsidiaries face strong direct competition for deposits, loans, and
other financial-related services. Mahaska's banks in Mahaska, Marion, Wapello,
Keokuk and Jefferson counties in south central Iowa and Midwest Federal Saving's
locations in eastern Iowa compete with other commercial banks, other thrifts,
credit unions, stockbrokers, finance divisions of auto and farm equipment
companies, agricultural suppliers, and other agricultural-related lenders. Some
of these competitors are local, while others are statewide or nationwide. The
subsidiary financial institutions compete for deposits principally by offering
depositors a wide variety of deposit programs, convenient office locations,
hours and other services, and for loan originations primarily through interest
rates and loan fees they charge, the efficiency and quality of services they
provide to borrowers and the variety of their loan products. Some of the
financial institutions and financial service organizations with which the
subsidiary financial institutions compete are not subject to the same degree of
regulation as that imposed on bank and thrift holding companies, federally
insured Iowa-chartered banks, and federal savings banks. As a result, such
competitors have advantages over the subsidiary financial institutions in
providing certain services.

         As of December 31, 1998, approximately twenty commercial banks, three
thrifts, and seven credit unions operated within a 25-mile radius of Oskaloosa,
and new competitors may develop that are substantially larger and have
significantly greater resources than any of the subsidiary financial
institutions. Currently, major competitors in certain of Mahaska's markets
include financial institution subsidiaries of Wells Fargo Corporation, Firstar
Corporation of Iowa, Mercantile Bank and NationsBank. As a result of recently
passed federal legislation to allow unlimited interstate branching, Mahaska has
experienced heightened competition from these and other major financial
institutions seeking to expand their regional banking presence in Iowa.

         Mahaska also faces competition with respect to its investments in loan
pool participations. Mahaska's financial success to date is largely attributable
to an independent loan servicer's ability to determine the loan pool
participations to bid on and ultimately purchase, the availability of assets to
fund the purchases, and the servicer's ability to collect on the underlying
assets. Investments in loan pool participations have become increasingly popular
in recent years, leading financial institutions and other competitors to become
active at loan pool participation auctions. There is no assurance that Mahaska
will be able to bid successfully to acquire loan pool participations in the
future. Certain existing competitors of Mahaska are substantially larger and
have significantly greater financial resources than Mahaska. Increased
participation by new institutions or other investors may also create increased
buying interest which could also result in higher bid prices for the type of
loan pools considered for investment by Mahaska. In addition, new and existing
competitors may develop due diligence procedures comparable to the servicer's
procedures. The emergence of such competition could have a material adverse
effect on Mahaska's business and financial results.

         MAHASKA'S GROWTH AND PROFITABILITY IS DEPENDENT ON RETAINING CURRENT
MANAGEMENT. The value of an investment in Mahaska common stock is dependent on
the ability of Mahaska's management, particularly its Chairman/President and its
Executive Vice President/Chief


                                      -19-
<PAGE>   34
Financial Officer to successfully manage Mahaska after the proposed Midwest
merger. If Mahaska's management is not able to satisfactorily perform its
duties, the benefits to an investor in Mahaska common stock could be less than
anticipated.

         There is no guaranty that the current management of Mahaska or Midwest
will continue to be employed by Mahaska and its subsidiaries after the merger.
Loss of the services of certain members of management of Mahaska could have a
negative effect on Mahaska's business and prospects. In addition, the loss of
Midwest Federal Savings' executive officers could hinder the integration of the
two companies. Mahaska believes that its future success will depend upon its
ability to attract, retain and motivate qualified personnel. There can be no
assurance that Mahaska will be successful in such endeavors.

         LIMITED MARKET FOR MAHASKA COMMON STOCK MAY ADVERSELY AFFECT ITS COMMON
STOCK PRICE. Mahaska common stock is quoted on the Nasdaq National Market. The
trading volume in Mahaska common stock is limited and currently averages
approximately 3,100 shares per trading day. Under these circumstances,
stockholders of Midwest acquiring Mahaska common stock may have difficulty
disposing of their shares on short notice if a limited number of willing buyers
are available for Mahaska common stock. Neither Mahaska nor Midwest can assure
you that an active trading market for Mahaska common stock will develop.

YEAR 2000 READINESS DISCLOSURE

         A critical issue has emerged in the banking industry and for the
economy overall regarding how existing computer application software programs,
operating systems and hardware can accommodate the date value for the year 2000.
This issue is an area of major emphasis as management of both companies are
actively working with their software and hardware vendors to assure that they
are compliant.

         THE COMBINED COMPANY MAY EXPERIENCE YEAR 2000 COMPUTER PROBLEMS THAT
HARM ITS BUSINESS. Certain computer systems may not correctly recognize dates
when the year changes from 1999 to 2000. This could cause computers to either
shut down or lead to incorrect calculations. Both Mahaska and Midwest have
reviewed their exposure to this problem, and do not believe they will incur
significant expenses either to remedy the problem or as a result of the effect
of the problem on business operations. However, year 2000 issues may cause
disruptions in the combined company's business for the following reasons:

                  -        Mahaska and Midwest cannot be certain that the
                           measures taken are or will be sufficient. Despite
                           their efforts, Mahaska and Midwest may incur
                           significant expenses to remedy unforeseen problems or
                           the combined company may suffer disruptions in its
                           business.

                  -        Third parties with whom Mahaska and Midwest have
                           relationships may not successfully complete their
                           year 2000 remediation efforts. This could also result
                           in disruptions in the combined company's business,
                           which would harm its financial condition, results of
                           operations and business prospects.


                                      -20-
<PAGE>   35
         MAHASKA'S READINESS. Mahaska is working with material non-information
system providers, including but not limited to security, telephone, utilities,
ATM cards, elevators, heating and cooling systems, check clearing services,
teller machines and proof equipment to determine their year 2000 compliance. An
assessment of the readiness of vendors, significant customers and other third
parties with which Mahaska does business is also underway.

         Mahaska could be faced with severe consequences if year 2000 issues are
not identified and resolved in a timely manner. A worst-case scenario would
result in the short-term inability to update customer financial records due to
unforseen processing issues. This would result in customers being unable to
receive timely information regarding their account balances. In addition, a
worst-case scenario for Mahaska is that major suppliers of electricity,
communication links and outside data processing services may fail in spite of
their best efforts to remediate their systems and in spite of Mahaska's best
efforts to test their systems. The major risk as a result of these possibilities
would be a loss of customer confidence.

         Mahaska has established year 2000 committees and plans at its financial
institution subsidiaries, and formal project plans have been developed and
adopted. Testing and contingency plans have also been developed and adopted by
Mahaska's subsidiaries. Testing procedures are underway and are expected to
continue throughout 1999. Mahaska purchased a new main-frame computer system
that is year 2000 compliant in 1997 at a cost of $430,000. This computer system
became fully operational in the first quarter of 1998 with the equipment cost
being depreciated over a five year period beginning in 1998.

         Mahaska's contingency plans include two components which are business
remediation and business resumption. The business remediation plan was developed
to mitigate the risk associated with the failure to successfully complete system
renovation, validation or implementation of Mahaska's year 2000 readiness. This
plan pertains to mission-critical systems developed in-house, by outside
software vendors, and by third-party service providers. The business resumption
plan is designed to be implemented in the event there are system failures at
critical dates.

         Mahaska anticipates that it will incur internal staff costs and other
expenses related to the enhancements necessary to become year 2000 compliant.
Based on Mahaska's current knowledge, the expense related to year 2000
compliance is not expected to have a material effect on Mahaska's financial
position or results of operations. It is estimated that the costs incurred by
Mahaska for year 2000 compliance will be approximately $35,000, exclusive of
costs associated with the new main-frame computer.

         MIDWEST'S READINESS. Midwest has conducted a comprehensive review of
its computer systems to identify the systems that could be affected by the year
2000 problem. Any of Midwest's programs that are time sensitive may recognize a
date using "00" as the year 1900 rather than the year 2000. This could result in
a major system failure or miscalculations. Management of Midwest anticipates
that the enhancements necessary to prepare its mission critical systems for the
year 2000 will be completed by mid-1999.


                                      -21-
<PAGE>   36
         Midwest is also aware of the risks to third parties, including vendors
(and to the extent appropriate, depositors and borrowers) and the potential
adverse impact on Midwest resulting from failures by these parties to adequately
address the year 2000 problem. Midwest has been communicating with its outside
data processing service bureau, as well as other third party service providers,
to assess their progress in evaluating and implementing any corrective measures
required by them to be prepared for the year 2000. To date, Midwest has not been
advised by any of its primary vendors that they do not have plans in place to
address and correct the year 2000 problem; however, no assurance can be given as
to the adequacy of such plans or to the timeliness of their implementation.

         Midwest anticipates that it will incur internal staff costs as well as
consulting and other expenses related to the enhancements necessary to prepare
its systems for the year 2000. Based on Midwest's current knowledge, the expense
of the year 2000 project as well as the related potential effect on Midwest's
earnings is not expected to have a material effect on Midwest's financial
position or results of operations. Midwest estimates that it has spent
approximately $22,000 through March 31, 1999 on the awareness, assessment,
renovation, and validation phases of its year 2000 effort. Midwest anticipates
that it will complete testing by mid-1999.

         The worst-case year 2000 scenario for Midwest is that major suppliers
of electricity, communication links, and data processing services may fail in
spite of their best efforts to remediate their systems and in spite of Midwest's
best effort to test their systems. The major risk as a result of these
possibilities would be the loss of customer confidence. Midwest has developed a
business resumption contingency plan to address these possibilities and minimize
the loss of confidence.


                                      -22-
<PAGE>   37
                     MARKET FOR COMMON STOCK AND DIVIDENDS

         Mahaska's common stock is listed and traded on the Nasdaq National
Market under the symbol "OSKY." Midwest's common stock is listed and traded on
the Nasdaq SmallCap Market under the symbol "MWBI." As of the Mahaska record
date, there were __________ shares of Mahaska common stock outstanding, which
were held by approximately ___ holders of record. As of the Midwest record date,
there were _________ shares of Midwest common stock outstanding, which were held
by approximately ___ holders of record.

         The following table sets forth information about the high and low
prices of the Mahaska common stock and the Midwest common stock as reported on
Nasdaq and the dividends declared per share of Mahaska common stock and Midwest
common stock.

<TABLE>
<CAPTION>
                                                   OSKY(1)                                     MWBI(2)
                                    -------------------------------------       -------------------------------------
                                         Market Price           Dividends           Market Price            Dividends
                                    ----------------------      Declared        ---------------------       Declared
                                     High           Low         Per Share        High           Low         Per Share
                                    -----           ------      ---------       ------         ------       ---------
<S>                                 <C>             <C>         <C>             <C>            <C>          <C>
            1997

First Quarter                       $14.41          $11.10         $0.12        $10.00         $ 8.75         $0.05
Second Quarter                       16.81           13.96          0.12         10.67           9.33          0.05
Third Quarter                        19.51           15.76          0.12         13.58          10.42          0.06
Fourth Quarter                       21.00           18.01          0.12         18.37          13.50          0.06

            1998

First Quarter                        23.63           18.50          0.14         18.25          16.00          0.07
Second Quarter                       22.63           20.75          0.14         17.00          14.50          0.08
Third Quarter                        21.81           19.63          0.14         15.25          10.75          0.09
Fourth Quarter                       20.00           16.75          0.14         12.75          11.75          0.10

            1999

First Quarter                        17.75           15.50          0.15         16.38          15.50          0.00(3)
Second Quarter (through May          15.86           14.86                       17.75          15.86          0.11
21,  1999)
</TABLE>


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

(1)      Restated to reflect the five-for-three stock split effected in the form
         of a dividend in November 1997.

(2)      Restated to reflect the three-for-one stock split effected in the form
         of a dividend in October 1997.

(3)      Delayed declaration of a dividend until April 1999 in accordance with
         the merger agreement.

         Mahaska increased dividends to common shareholders in 1998 to $0.56 per
share, a 16.7 percent increase over $0.48 for 1997. Dividend declarations are
evaluated and determined by the Board of Directors on a quarterly basis. Mahaska
declared a five-for-three stock split effected in the form of a stock dividend
payable to shareholders of record as of October 20, 1997. The additional shares
resulting from this stock split were issued to shareholders on November 10,
1997. In February 1999, the board of directors declared a dividend of $0.15 per
common share. Mahaska's loan agreement requires that Mahaska does not pay any
dividends in excess of forty


                                      -23-
<PAGE>   38
percent of net income without the lenders' permission. Except for the Mahaska
loan agreement and certain regulatory restrictions that may affect dividend
payments, there are no other restrictions on Mahaska's present or future ability
to pay dividends.

         Beginning with the first quarter of 1993, Midwest has paid quarterly
cash dividends to stockholders and intends to continue paying quarterly
dividends, dependent on the future earnings and financial condition of Midwest
as well as other relevant factors. Midwest's ability to pay dividends is
dependent on the dividend payments it receives from its subsidiary, Midwest
Federal Savings, which are subject to regulation and Midwest Federal Savings'
continued compliance with all regulatory capital requirements. Midwest is also
subject to the requirements of Delaware law, which generally limits dividends to
an amount in excess of a corporation's net assets over paid-in capital, or, if
there is no such excess, to its net profits for the current and immediately
preceding fiscal year.

                               GENERAL INFORMATION

         This joint proxy statement/prospectus is being furnished to the
shareholders of Mahaska and the stockholders of Midwest in connection with the
solicitation of proxies by the Boards of Directors of Mahaska and Midwest for
use at the Mahaska special meeting and the Midwest annual meeting, respectively.
This joint proxy statement/prospectus also serves as a prospectus of Mahaska in
connection with the issuance of Mahaska common stock to holders of Midwest
common stock in the merger.

         All information contained or incorporated by reference in this joint
proxy statement/prospectus with respect to Mahaska has been supplied by Mahaska,
and all information contained or incorporated by reference in this joint proxy
statement/prospectus with respect to Midwest has been supplied by Midwest.

         This joint proxy statement/prospectus and the other documents enclosed
herewith are first being mailed to shareholders of Mahaska and stockholders of
Midwest on or about __________, 1999.

                                  THE MEETINGS

TIME, DATE AND PLACE

         The Mahaska special meeting will be held at 2:00 p.m., central time, on
________, 1999 at the Elmhurst Country Club, 2214 South 11th Street, Oskaloosa,
Iowa 52577.

         The Midwest annual meeting will be held at 2:00 p.m., central time, on
____________, 1999, at 3225 Division Street, Burlington, Iowa.

MATTERS TO BE CONSIDERED

         At the meetings, shareholders of Mahaska and stockholders of Midwest
will consider and vote upon proposals to approve or adopt the merger agreement.
Midwest stockholders will also


                                      -24-
<PAGE>   39
vote on the election of two directors and ratification of auditors. Pursuant to
applicable law and the articles of incorporation and bylaws of Mahaska, no other
business may properly come before the Mahaska special meeting.

SHARES OUTSTANDING AND ENTITLED TO VOTE; RECORD DATES

         The close of business on ___________, 1999 has been fixed by the board
of directors of Mahaska as the Mahaska record date for the determination of
holders of Mahaska common stock entitled to notice of and to vote at the Mahaska
special meeting and any adjournment or adjournments thereof. At the close of
business on the Mahaska record date, there were ________ shares of Mahaska
common stock outstanding and entitled to vote. Each share of Mahaska common
stock entitles the holder thereof to one vote on all matters properly presented
at the Mahaska special meeting.

         The close of business on ___________, 1999 has been fixed by the board
of directors of Midwest as the Midwest record date for the determination of
holders of Midwest common stock entitled to notice of and to vote at the Midwest
annual meeting and any adjournment or adjournments thereof. At the close of
business on the Midwest record date, there were ___________ shares of Midwest
common stock outstanding and entitled to vote. Each share of Midwest common
stock entitles the holder thereof to one vote on all matters properly presented
at the Midwest annual meeting.

VOTES REQUIRED

         A quorum, consisting of the holders of a majority of the issued and
outstanding shares of common stock must be present in person or by proxy before
any action may be taken at the Mahaska special meeting or the Midwest annual
meeting, as the case may be. The affirmative vote of the holders of a majority
of the shares of Mahaska common stock outstanding as of the Mahaska record date,
voting in person or by proxy, is necessary to approve the merger agreement on
behalf of Mahaska. The affirmative vote of the holders of a majority of the
shares of Midwest common stock outstanding as of the Midwest record date, voting
in person or by proxy, is necessary to adopt the merger agreement on behalf of
Midwest. The directors of Midwest must be elected by a plurality of shares and
the ratification of auditors requires a majority of stockholders actually voting
on the matter.

         Directors and executive officers of Mahaska holding in the aggregate
865,633 shares or 22.6% of Mahaska common stock have indicated that they will
vote in favor of the merger agreement although no written agreement to do so is
in place. Directors and executive officers of Midwest holding in the aggregate
378,665 shares or 34.3% of Midwest common stock have indicated that they will
vote in favor of the merger agreement although no written agreement to do so is
in place.

         Each proposal to approve or adopt the merger agreement is considered a
"non-discretionary item" whereby brokerage firms may not vote in their
discretion on behalf of their clients if such clients have not furnished voting
instructions. Abstentions and broker "non-votes" at the Mahaska special meeting
and the Midwest annual meeting will be considered in


                                      -25-
<PAGE>   40
determining the presence of a quorum but will not be counted as votes cast at
these meetings. Because the proposals to approve or adopt the merger agreement
are required to be approved by the holders of a majority of the outstanding
shares of Midwest common stock and Mahaska common stock, abstentions and broker
"non-votes" will have the same effect as a vote against the proposals.

VOTING AND REVOCATION OF PROXIES

         Each copy of this joint proxy statement/prospectus mailed to holders of
Mahaska common stock and Midwest common stock is accompanied by a form of proxy
for use at the Mahaska special meeting or the Midwest annual meeting, as the
case may be. Any shareholder or stockholder, as applicable, executing a proxy
may revoke it at any time before it is voted by:

                  -        filing with the Secretary of Mahaska (in the case of
                           a Mahaska shareholder) or the Secretary of Midwest
                           (in the case of a Midwest stockholder) at the address
                           of Mahaska or Midwest set forth on their notices of
                           special meeting, written notice of such revocation;

                  -        executing and returning a later-dated proxy; or

                  -        attending the Mahaska special meeting or the Midwest
                           annual meeting, as applicable, and giving notice of
                           such revocation in person.

Attendance at the applicable meeting will not, in and of itself, constitute
revocation of a proxy.

         Each proxy returned to Mahaska or Midwest by a holder of Mahaska common
stock or Midwest common stock will be voted in accordance with the indicated
instructions. If no instructions are indicated, the proxy will be voted for
approval/adoption of the merger agreement, and in favor of management's nominees
for director and in favor of the ratification of auditors in the case of Midwest
stockholders. Proxies marked "for" approval/adoption of the merger agreement and
proxies executed but unmarked will be voted in the discretion of the persons
named in the accompanying proxies as to any proposed adjournment of the Mahaska
and/or Midwest meeting. Proxies which are voted against approval/adoption of the
merger agreement will not be voted in favor of any motion to adjourn the Mahaska
and/or Midwest meeting to solicit more votes in favor of approval/adoption of
the merger agreement.

         It is not expected that any matter other than those referred to herein
will be brought before the Mahaska special meeting. Additional matters regarding
Midwest are contained in this joint proxy statement/prospectus under the heading
"Additional Matters for Midwest's Annual Meeting." If other matters are properly
presented, however, the persons named as proxies will vote in accordance with
their judgment with respect to such matters.

SOLICITATION OF PROXIES

         Each of Mahaska and Midwest will bear its costs of mailing this joint
proxy statement/prospectus to its holders of common stock, as well as all other
costs incurred by it in


                                      -26-
<PAGE>   41
connection with the solicitation of proxies from its holders of common stock on
behalf of its board of directors, except that Mahaska and Midwest will share
equally the fees for printing this joint proxy statement/prospectus. All filing
fees in connection with this joint proxy statement/prospectus, including the
Commission's registration fee, will be paid by Mahaska. In addition to
solicitation by mail, the directors, officers and employees of each company and
its subsidiaries may solicit proxies from shareholders or stockholders by
telephone, telegram or in person without compensation other than reimbursement
for their actual expenses. Arrangements also will be made with brokerage firms
and other custodians, nominees and fiduciaries for the forwarding of
solicitation material to the beneficial owners of stock held of record by such
person. Mahaska or Midwest, as the case may be, will reimburse the custodians,
nominees and fiduciaries for their reasonable out-of-pocket expenses in
connection with these activities.

         Mahaska and Midwest have each retained ____________, a professional
proxy solicitation firm, to assist them in the solicitation of proxies. The fees
payable to such firm in connection with the merger aggregate $________, plus
reimbursement for reasonable out-of-pocket expenses.

APPRAISAL RIGHTS

         If the merger agreement is adopted by the shareholders of Mahaska and
the merger is consummated, Mahaska may have obligations under Section 490.1301
of the Iowa Business Corporations Act to dissenting shareholders. To qualify as
a dissenting shareholder, a shareholder must (a) provide a notice to Mahaska no
later than the day of the Mahaska special meeting demanding appraisal of the
Mahaska common stock held by the shareholder, and (b) not vote such shares in
favor of the adoption of the merger agreement.

         If the merger agreement is adopted by the stockholders of Midwest and
the merger is consummated, Midwest may have obligations under Section 262 of the
Delaware General Corporation Law to dissenting stockholders. To qualify as a
dissenting stockholder, a stockholder must (a) provide a notice to Midwest no
later than the day of the Midwest annual meeting demanding appraisal of the
Midwest common stock held by the stockholder, and (b) not vote such shares in
favor of the adoption of the merger agreement.

         If holders of more than 8% of the outstanding shares of Midwest common
stock, in the aggregate, are dissenting stockholders, the merger may not be
accounted for as a pooling of interests and one of the closing conditions of the
merger will not be satisfied. See "The Merger Agreement -- Appraisal Rights."

                                   THE MERGER

         The following information relating to the merger does not purport to be
complete and is qualified in its entirety by reference to the merger agreement,
a copy of which is attached to this joint proxy statement/prospectus as Annex I.
You are urged to read the merger agreement carefully.


                                      -27-
<PAGE>   42
GENERAL

         In accordance with the terms of and subject to the conditions set forth
in the merger agreement, Midwest will be merged into Mahaska, with Mahaska as
the surviving corporation of the merger. Midwest Federal Savings will continue
its corporate existence as a Mahaska subsidiary.

         At the effective time of the merger, each outstanding share of Midwest
common stock will be converted into the right to receive one share of Mahaska
common stock.

         Each of the Mahaska board of directors and the Midwest board of
directors has unanimously approved the merger agreement and the transactions
contemplated thereby and believes that the merger is fair and in the best
interests of Mahaska's shareholders and Midwest's stockholders, respectively.
ACCORDINGLY, THE BOARD OF DIRECTORS OF EACH OF MAHASKA AND MIDWEST UNANIMOUSLY
RECOMMENDS THAT SHAREHOLDERS OF MAHASKA AND STOCKHOLDERS OF MIDWEST VOTE "FOR"
THE APPROVAL OR ADOPTION OF THE MERGER AGREEMENT.

MATERIAL CONTACTS AND BOARD DELIBERATIONS.

         Midwest was organized in 1992 as the holding company for Midwest
Federal Savings. In connection with Midwest Federal Saving's conversion from a
mutual savings and loan to a stock savings and loan, Midwest raised $4.6 million
in an initial public offering.

         Through the years Midwest has, on an ongoing basis, attempted to
increase its value to stockholders by building a strong retail franchise. Since
becoming a stock company, Midwest has also increased its stockholders' value
with the payment of quarterly cash dividends and the issuance of a 3-for-1 stock
split in 1997. In addition, management of Midwest has reviewed, from time to
time, its strategic alternatives in light of its size, the increasing
consolidation of the financial services industry and other relevant
considerations.

         Throughout the first and second quarter of 1998, Midwest, with Charles
Webb & Company's help, evaluated its business plan, including its historical
strategy of increasing the earnings generated by its retail franchise through
the addition of wholesale leverage opportunities. Discussions included:

                  -        an analysis of competition at the retail franchise
                           level and the ability to grow this part of the
                           business through acquisitions that would meet
                           Midwest's asset mix and geographic goals or
                           additional new branch locations;

                  -        the liquidity of Midwest's stock and the potential to
                           continue to increase stockholder value through share
                           repurchase programs; and

                  -        the status of the current merger market, the relative
                           pricing and the opportunities that might be available
                           for Midwest.


                                      -28-
<PAGE>   43
All of these issues were analyzed in connection with Midwest's goal to continue
to increase stockholder value. Based on this review, on April 28, 1998, the
board of directors of Midwest decided to determine the level of interest that
might exist for a strategic alliance on the part of potential acquirors of
Midwest. The board of directors also authorized Charles Webb & Company to
solicit indications of interest from prospective acquirors.

         Charles Webb & Company, working with Midwest, prepared a confidential
investor package containing financial and operating information about Midwest
and Midwest Federal Savings. In June 1998, Charles Webb & Company, on behalf of
Midwest, began a confidential inquiry and contacted a total of 24 potential
candidates. Thirteen of those companies executed confidentiality agreements.
Twelve of which, including Mahaska, received the confidential investor package.
The one company that did not receive the confidential investor package after
signing a confidentiality agreement opted not to proceed with the process for a
variety of reasons.

         Three financial institutions, including Mahaska, submitted preliminary,
non-binding indications of interest to acquire Midwest. Upon receipt of the
preliminary indications of interest, Charles Webb & Company reviewed with
Midwest the pricing and other terms of each proposal. Additionally, Charles Webb
& Company reviewed with Midwest the relative value of the stock or cash
consideration offered by each of the interested parties. After discussion,
Midwest's board determined to go back to Mahaska to explore the possibility for
a stronger offer. After providing additional information to Mahaska, a revised
proposal was received in September 29, 1998.

         Midwest determined that the Mahaska revised proposal was acceptable,
and further discussions regarding more complete terms were held. Due diligence
and discussion of the merger agreement commenced immediately. Upon completion of
the due diligence and negotiation of a merger agreement, the pricing, as
detailed in the revised indication of interest, with a fixed exchange rate of
one share of Mahaska common stock for each share of Midwest common stock, was
unchanged.

         On February 2, 1999, Midwest's board met with Charles Webb & Company
and Midwest's legal counsel. Prior to this meeting, the merger agreement and a
fairness presentation prepared by Charles Webb & Company were distributed to
Midwest board members for their review. At the Midwest board meeting on February
2, 1999, Midwest's legal counsel reviewed the terms of the merger agreement and
other relevant documents and the contemplated transaction. Charles Webb &
Company delivered its opinion that the exchange ratio was fair, from a financial
point of view, to the holders of Midwest common stock. After a thorough
discussion of the transaction, including a review of the due diligence findings,
Midwest's board voted unanimously to approve the merger agreement and authorized
execution of the merger agreement and related documents.

         On July 21, 1998, Mahaska received the confidential investor package
from Midwest. On August 14, 1998, Mahaska submitted a proposal to acquire
Midwest. At Midwest's request and after consultation with its board, Mahaska
submitted a revised proposal to Midwest's board and Charles Webb & Company on
September 29, 1998. The revised proposal containing the


                                      -29-
<PAGE>   44
one-for-one exchange ratio was deemed acceptable by Midwest and Mahaska
completed its due diligence and began drafting and negotiation of the merger
agreement.

         On February 2, 1999, the Mahaska board considered and discussed the
reasons for, and the potential benefits of the merger; Mahaska's legal counsel
prepared a summary of the merger agreement and the Chairman reviewed the terms
of the merger agreement and the transactions contemplated thereby; and Mahaska's
financial advisor made a presentation regarding the financial terms of the
merger agreement and the fairness, from a financial point of view, of the
exchange ratio to holders of Mahaska common stock. After a thorough discussion
and consideration of the factors discussed below under "The Merger -
Recommendations of the Boards of Directors and Reasons for the Merger," the
Mahaska board unanimously approved the merger agreement and the transactions
contemplated thereby, and authorized the execution of the merger agreement.

         Subsequent to February 2, 1999, Midwest's board received a proposal
from a third party. This proposal was considered in connection with Midwest
board's fiduciary responsibilities and was rejected.

RECOMMENDATIONS OF THE BOARDS OF DIRECTORS AND REASONS FOR THE MERGER

         The merger will result in a holding company with combined assets close
to $500 million, positioning Mahaska as the 12th largest bank holding company
headquartered in Iowa. The expanded network of 13 locations will reach from
Mahaska's current locations in central Iowa to the eastern border. The merger
provides Mahaska with an increased market share and enhanced visibility
throughout eastern Iowa.

         In reaching their determination that the merger is in the best
interests of Mahaska and Midwest, respectively, and their respective
shareholders and stockholders, and recommending that such shareholders and
stockholders approve or adopt the merger agreement, the Mahaska Board and the
Midwest Board considered a number of other factors, including, without
limitation, the following:

                  -        the value of the Mahaska common stock that would be
                           received based on the exchange ratio in relation to
                           the estimated value of Midwest common stock and the
                           liquidity of the trading market for the Mahaska
                           common stock;

                  -        Mahaska's and Midwest's respective business, results
                           of operations, financial condition, long-term
                           strategic plan and prospects, as well as the
                           historical and potential future value of the Mahaska
                           common stock and the dividends paid thereon;

                  -        the similar community banking cultures and business
                           philosophies of Mahaska and Midwest;


                                      -30-
<PAGE>   45
                  -        the projected market capitalization and market
                           position of the combined company, the potential
                           operating efficiencies and financial strength the
                           merger would provide to the combined company, its
                           customers and the communities it serves, and the
                           immediate and long-term effect that the merger would
                           have on the ability of the combined company to
                           compete more effectively in Iowa;

                  -        the possible impact of the merger on Mahaska's and
                           Midwest's customers and the ability of the combined
                           company to offer an expanded range of financial
                           products and services;

                  -        the current and prospective economic, regulatory and
                           competitive climate facing independent community
                           banking organizations, including the consolidation
                           currently underway in the banking and thrift
                           industries and competition from larger institutions
                           and from nonbank providers of financial services;

                  -        the opinion of Howe Barnes Investments, Inc. that the
                           exchange ratio is fair to Mahaska shareholders from a
                           financial point of view, as delivered orally to the
                           Mahaska board on February 2, 1999 and confirmed in
                           writing, and the opinion of Charles Webb & Company,
                           that the exchange ratio is fair to Midwest
                           stockholders from a financial point of view, as
                           delivered orally to the Midwest board on February 2,
                           1999 and confirmed in writing, each of which opinions
                           have been updated as of the date of this joint proxy
                           statement/prospectus (see "- Opinions of Financial
                           Advisors");

                  -        the terms of the merger agreement;

                  -        the regulatory and shareholder or stockholder
                           approvals required for the consummation of the merger
                           (see "- Regulatory Approvals");

                  -        the treatment of the merger as a pooling of interests
                           for accounting purposes and as a tax-free
                           reorganization for federal income tax purposes (see
                           "- Federal Income Tax Consequences" and "- Accounting
                           Treatment of the Merger"); and

                  -        the long- and short-term interests of Mahaska and
                           Midwest and their respective shareholders and
                           stockholders as well as the interests of Mahaska's
                           and Midwest's other relevant constituencies,
                           including their respective customers and employees
                           and the communities served by Mahaska and Midwest and
                           their financial institution subsidiaries.

The foregoing discussion of the information and factors considered by the
Mahaska board and the Midwest board is not intended to be exhaustive, but
includes all material factors considered by such boards of directors. In
reaching their determination to approve and recommend the merger agreement and
the transactions contemplated thereby, the Mahaska board and the


                                      -31-
<PAGE>   46
Midwest board did not assign relative or specific weights to the foregoing
factors, and individual directors may have given differing weights to different
factors.

         For the reasons described above, the Mahaska board and the Midwest
board have determined that the merger is in the best interests of Mahaska and
Midwest, respectively, and their respective shareholders and stockholders.
Accordingly, the Mahaska board and the Midwest board have unanimously approved
the merger agreement and the transactions contemplated thereby, including the
merger, and unanimously recommend that the Mahaska shareholders vote "for"
approval and the Midwest stockholders vote "for" the adoption of the merger
agreement.

OPINIONS OF FINANCIAL ADVISORS

         MAHASKA. At the meeting of the board of directors of Mahaska on
February 2, 1999, at which the terms of the proposed merger were discussed and
considered, Howe Barnes Investments, Inc. rendered an opinion to Mahaska's board
of directors that, as of the date of such opinion and based upon the matters set
forth in such opinion, the exchange ratio pursuant to the merger agreement was
fair, from a financial point of view, to the holders of Mahaska common stock.
This opinion has been updated as of the date of this joint proxy
statement/prospectus.

         The full text of Howe Barnes' opinion which sets forth assumptions
made, procedures followed, matters considered, and limits on the review
undertaken by Howe Barnes, is attached as Annex III and is incorporated herein
by reference. The description of the Howe Barnes opinion set forth in this joint
proxy statement/prospectus is qualified in its entirety by reference to the full
text of such opinion. Mahaska shareholders are urged to read the Howe Barnes
opinion in its entirety.

         Howe Barnes' opinion is limited to the fairness, from a financial point
of view, of the exchange ratio pursuant to the merger agreement to the holders
of Mahaska common stock, it does not address Mahaska's underlying business
decision to proceed with the merger, nor does it express an opinion as to the
prices at which shares of Mahaska common stock issued in the merger may trade if
and when they are issued or at any future time. The opinion is directed only to
the exchange ratio in the merger and does not constitute a recommendation to any
holder of Mahaska common stock as to how such holder should vote with respect to
the merger agreement at any meeting of holders of Mahaska common stock.

         Howe Barnes, as part of its investment banking business, is regularly
engaged in the valuation of banks and bank holding companies, thrifts and thrift
holding companies, and various other financial services companies, in connection
with mergers and acquisitions, initial and secondary offerings of securities,
and valuations for other purposes. The Mahaska board of directors selected Howe
Barnes on the basis of its familiarity with the financial services industry, its
qualifications, ability, previous experience and its reputation with respect to
such matters.

         For purposes of its opinion, in connection with its review of the
proposed transaction with Midwest, Howe Barnes, among other things:


                                      -32-
<PAGE>   47
                  -        participated in discussions with representatives of
                           both Mahaska and Midwest concerning each company's
                           financial condition, businesses, assets, earnings,
                           prospects, and such senior management's views as to
                           its future financial performance;

                  -        reviewed the merger agreement and the specific terms
                           of the merger;

                  -        reviewed certain publicly available financial
                           statements, both audited and unaudited, and related
                           financial information of Mahaska and Midwest,
                           including those included in their respective Annual
                           Reports on Form 10-K and Form 10-KSB for the past two
                           years and the respective Quarterly Reports on Form
                           10-Q and Form 10-QSB for the periods ended March 31,
                           1998, June 30, 1998, and September 30, 1998, as well
                           as other internally generated reports relating to
                           asset/liability management, asset quality, and so
                           forth;

                  -        reviewed certain financial forecasts and projections
                           of Mahaska and Midwest prepared by its management and
                           reviewed publicly available information for Mahaska
                           and Midwest;

                  -        discussed and reviewed certain aspects of the past
                           and current business operations, financial condition,
                           and future prospects of Mahaska and Midwest with
                           certain members of management;

                  -        reviewed reported market prices and historical
                           trading activity of Mahaska and Midwest common stock;

                  -        reviewed certain aspects of the financial performance
                           of Mahaska and Midwest and compared such financial
                           performance of Mahaska and Midwest, together with
                           stock market data relating to Mahaska and Midwest
                           common stock, with similar data available for certain
                           other financial institutions and certain of their
                           publicly traded securities; and

                  -        reviewed certain of the financial terms, to the
                           extent publicly available, of certain recent business
                           combinations involving other financial institutions.

         In conducting its review and rendering its opinion, Howe Barnes assumed
and relied, without independent verification, upon the accuracy and completeness
of all of the financial and other information that has been provided to Howe
Barnes by Mahaska, Midwest, and their respective representatives, and of the
publicly available information that was reviewed by Howe Barnes. Howe Barnes is
not an expert in the evaluation of allowances for loan losses and has not
independently verified such allowances, and has relied on and assumed that the
aggregate allowances for loan losses set forth in the balance sheets of each of
Mahaska and Midwest at December 31, 1998 are adequate to cover such losses and
complied fully with applicable law, regulatory policy, and sound banking
practice as of the date of such financial statements. Howe Barnes was not
retained to and did not conduct a physical inspection of any of the properties
or


                                      -33-
<PAGE>   48
facilities of Mahaska or Midwest, did not make any independent evaluation or
appraisal of the assets, liabilities or prospects of Mahaska or Midwest, was not
furnished with any such evaluation or appraisal, and did not review any
individual credit files. Howe Barnes's opinion is necessarily based on economic,
market, and other conditions as in effect on, and the information made available
to us as of, the date hereof.

         The following is a brief summary of the analyses presented by Howe
Barnes to Mahaska's board of directors in connection with Howe Barnes's written
opinion.

         Comparable Transaction Analysis. As part of its analyses, Howe Barnes
reviewed 11 completed or pending comparable mergers and acquisitions of savings
institutions headquartered throughout the United States announced from March 6,
1998 to December 17, 1998 in which total assets of the acquired company were in
the approximate range of $100 million to $275 million. The comparable
transactions included the following transactions:

                  -        the acquisition of Wood Bancorp Inc. by Sky Financial
                           Group;

                  -        the acquisition of Maple Leaf Financial Inc. by GLB
                           Bancorp Inc.;

                  -        the acquisition of Bank of Stockdale FSB by VIB
                           Corp.;

                  -        the acquisition of First Savings Bancorp of Little
                           Falls by Greater Community Bancorp;

                  -        the acquisition of Mid-Iowa Financial Corp. by First
                           Federal Savings Bank of Siouxland;

                  -        the acquisition of 1st Bancorp by German American
                           Bancorp;

                  -        the acquisition of Wayne Bancorp Inc. by Valley
                           National Bancorp;

                  -        the acquisition of AFSALA Bancorp Inc. by Ambanc
                           Holding Co. Inc.;

                  -        the acquisition of Summit Savings, FSB by a private
                           investor - Marshall T. Reynolds;

                  -        the acquisition of UniFirst Federal Savings Bank by
                           Republic Security Financial Corporation; and

                  -        the acquisition of Tappan Zee Financial Inc. by USB
                           Holding Company.

         For each transaction for which data was available, Howe Barnes
calculated the multiple of the offer value to the acquired company's: (a)
earnings per share for the twelve months preceding ("LTM"); (b) premium to core
deposits; (c) book value per share; (d) tangible book value per share; and (e)
assets. Howe Barnes compared these multiples with the corresponding multiples
for the merger, valuing the merger consideration at $19.0 million or $17.00 per
share.


                                      -34-
<PAGE>   49
In calculating the multiples for the merger, Howe Barnes used Midwest's
earnings per share for the twelve months ended December 31, 1998, and book value
per share, tangible book value per share and core deposits as of December 31,
1998.

<TABLE>
<CAPTION>
                                                                                       PRICE/
                          PRICE/LTM        CORE DEPOSIT        PRICE/BOOK             TANGIBLE
                          EPS RATIO           PREMIUM             VALUE              BOOK VALUE         PRICE/ASSETS
                             (X)                (%)                (%)                   (%)                 (%)
<S>                       <C>              <C>                 <C>                   <C>                <C>
High:                       45.76              32.98             289.80                289.80               35.48
Low:                        16.20               4.34             144.62                144.62                8.82
Mean:                       29.16              18.19             208.22                208.62               20.36
Median:                     26.20              19.35             200.44                200.44               20.88

Merger Consideration                                                                                        11.72
for Midwest:                13.87              6.93              158.13                158.13
</TABLE>

         No company or transaction used in the above analyses as a comparison is
identical to Mahaska, Midwest, or the merger. Accordingly, an analysis of the
results of the foregoing is not mathematical; rather, it involves complex
considerations and judgments concerning differences in financial operating
characteristics, including, among other things, differences in revenue
composition and earnings performance among the companies, and other facts that
could affect the public trading value of the companies to which they are being
compared.

         Discounted Cash Flow Analysis. Using discounted cash flow analysis,
Howe Barnes estimated the future dividend streams that Midwest could produce
over the period from January 1, 1999 through December 31, 2003, assuming annual
asset growth rates and further assumed Midwest performed in accordance with
recent historical trends and the future outlook of Midwest management. Howe
Barnes calculated terminal values as a perpetuity with an asset growth rate of
3.0%. The dividend streams and terminal value were discounted to present values
as of December 31, 1998, using discount rates which reflect different
assumptions regarding the required rates of return to holders and prospective
buyers of Midwest common stock. Howe Barnes estimated a range of terminal values
by applying multiples to estimated year-end 2003 net income. The range of
terminal multiples was chosen based on past and current trading multiples of
institutions similar to Midwest and past and current multiples of comparable
merger and acquisition transactions. The range of present values of Midwest
resulting from this analysis was then compared with the $19.0 million merger
consideration.


<TABLE>
<CAPTION>
                                                         LONG-TERM           TERMINAL           CALCULATED
                  GROWTH RATE       DISCOUNT RATE       GROWTH RATE          MULTIPLES            VALUES
                  -----------       -------------       -----------          ---------            ------
<S>               <C>               <C>                 <C>                  <C>              <C>
High:                5.00%              12.00%             3.00%                15x           $22.0 million

Low:                 3.00%              10.00%             3.00%                12x           $16.8 million
</TABLE>

         Contribution Analysis. Howe Barnes utilized publicly available
historical financial data regarding Mahaska and


                                      -35-
<PAGE>   50
Midwest and estimates for future financial performance of Mahaska and Midwest to
calculate the relative contributions of Mahaska and Midwest to the pro forma
combined company with respect to total assets, deposits, equity, and earnings
for 1998. Howe Barnes compared such contributions to the pro forma ownership of
the combined company by Mahaska shareholders and Midwest stockholders,
respectively.

<TABLE>
<CAPTION>

                                                                       1998
                   TOTAL ASSETS      DEPOSITS         EQUITY         EARNINGS
                   ------------      --------         ------         --------
<S>                <C>               <C>              <C>            <C>
Mahaska               64.77%          68.71%           76.5%          77.11%

Midwest               35.23%          31.29%           23.5%          22.89%
</TABLE>

         The pro forma ownership based on the exchange ratio, shares outstanding
for Mahaska at December 31, 1998 and fully diluted shares outstanding for
Midwest is 76.46% for Mahaska and 23.54% for Midwest.

         Pro Forma Merger Analysis. Howe Barnes noted that, based upon estimates
of Mahaska's and Midwest's management and after giving effect to Mahaska
management's net pre-tax cost savings estimates resulting from synergies created
from the merger, internal asset and deposit growth estimates and certain
assumptions, as to, among other things, the number of pro forma shares
outstanding, the proposed merger could be accretive to Mahaska's estimated 1999
earnings per share on a fully diluted basis by approximately 2% and tangible
book value by approximately 5%. In this analysis, Howe Barnes assumed that both
Mahaska and Midwest would perform substantially in accordance with earnings
forecasts provided to Howe Barnes by Mahaska's and Midwest's management. The
actual results achieved by the combined company may vary from projected results
and the variations may be material. This analysis is based on the assumption
that the merger would be accounted for as a pooling of interests and excludes
merger-related expenses.

         The foregoing is a summary of the material financial analyses performed
by Howe Barnes and presented to the Mahaska board of directors, but does not
purport to be a complete description of the analyses performed by Howe Barnes.
The preparation of a fairness opinion is a complex process and is not
necessarily susceptible to partial analysis or summary description. Furthermore,
in arriving at its opinion, Howe Barnes did not attribute any particular weight
to any analysis or factor considered by it, but rather made qualitative
judgments as to the significance and relevance of each analysis and factor.
Selecting portions of the analyses or of the summary set forth above, without
considering the analyses as a whole, could create an incomplete view of the
processes underlying Howe Barnes' opinion. The ranges of valuations resulting
from any particular analysis described above should not be taken to be Howe
Barnes' view of the actual value of Midwest, or the current or future trading
price for Mahaska common stock.

         In performing its analyses, Howe Barnes made numerous assumptions with
respect to industry performance, business and economic conditions and other
matters, many of which are beyond the control of Mahaska and Midwest. The
analyses performed by Howe Barnes are not


                                      -36-
<PAGE>   51
necessarily indicative of actual values of future results, which may be
significantly more or less favorable than suggested by such analyses. Such
analyses were prepared solely as part of Howe Barnes' analysis of the fairness
of the merger consideration, from a financial point of view, to the holders of
Mahaska common stock. The analyses do not purport to be appraisals or to reflect
the prices at which a company or its securities may actually be bought or sold.

         Pursuant to the terms of a letter agreement dated October 5, 1998,
Mahaska agreed to pay Howe Barnes for its services in connection with the
merger, including the rendering of its opinion. Pursuant to its engagement of
Howe Barnes, Mahaska agreed to pay Howe Barnes a cash fee of $100,000 payable on
the closing date, for advisory services rendered in connection with reaching the
merger agreement. In the ordinary course of business Howe Barnes acts as a
market maker, buying and selling the common stock of Mahaska for its own account
and for the accounts of customers. In addition, Mahaska agreed to indemnify Howe
Barnes against certain liabilities arising out of its engagement, including
liabilities under the federal securities laws.

         MIDWEST. On April 28, 1998, Midwest Bancshares retained Charles Webb &
Company to evaluate Midwest's strategic alternatives as part of a stockholder
enhancement program and to review and evaluate any specific proposals for a
strategic alliance involving Midwest that might be received. Charles Webb &
Company, as part of its investment banking business, is regularly engaged in the
evaluation of businesses and securities in connection with mergers and
acquisitions, negotiated underwritings and distributions of listed and unlisted
securities. Charles Webb & Company is familiar with the market for common stocks
of publicly traded banks, thrifts and bank and thrift holding companies. The
Midwest board selected Charles Webb & Company on the basis of the firm's
reputation and its experience and expertise in transactions similar to the
merger and its prior work for, and relationship with, Midwest.

         In connection with its engagement, Charles Webb & Company was asked to
render an opinion as to the fairness, from a financial point of view, of the
consideration to be received by stockholders of Midwest in the merger. Charles
Webb & Company delivered its opinion to the Midwest board that, as of February
2, 1999, the exchange ratio is fair from a financial point of view, to the
stockholders of Midwest. This opinion has been updated as of the date of this
joint proxy statement/prospectus. No limitations were imposed by the Midwest
board upon Charles Webb & Company with respect to the investigations made or
procedures followed by it in rendering its opinion. Charles Webb & Company has
consented to the inclusion in this joint proxy statement/prospectus of the
summary of its opinion to the Midwest board and to the reference to the entire
opinion attached hereto as Annex IV.

         The full text of the opinion of Charles Webb & Company, which is
attached as Annex IV to this joint proxy statement/prospectus, includes certain
assumptions made, matters considered and limitations on the review undertaken by
Charles Webb & Company, and should be read in its entirety. The summary of the
opinion of Charles Webb & Company in this joint proxy statement/prospectus is
qualified in its entirety by reference to the opinion.

         In rendering its opinion, Charles Webb & Company:

                  -        reviewed the merger agreement;


                                      -37-
<PAGE>   52
                  -        reviewed Midwest's Annual Reports, Proxy Statements
                           and Form 10-KSB's for the prior three fiscal years
                           and Mahaska's Annual Reports, Proxy Statements and
                           Form 10-K's for the prior three fiscal years and
                           certain other information considered relevant,
                           including internal reports, such as board reports,
                           asset-liability reports, asset-quality reports and
                           loan files;

                  -        discussed with senior management and the boards of
                           directors of Midwest and its wholly-owned subsidiary,
                           Midwest Federal Savings, the current position and
                           prospective outlook for Midwest;

                  -        considered historical quotations, levels of activity
                           and prices of recorded transactions in Midwest's and
                           Mahaska's common stock;

                  -        reviewed financial and stock market data of other
                           thrifts in a comparable asset range and asset
                           composition as Midwest;

                  -        reviewed financial and stock market data of other
                           banks in a comparable asset range, location and
                           performance standards as Mahaska;

                  -        reviewed certain recent business combinations with
                           thrifts as the acquired company, which Charles Webb &
                           Company deemed comparable in whole or in part; and

                  -        performed other analyses that Charles Webb & Company
                           considered appropriate.


         In rendering its opinion, Charles Webb & Company assumed and relied
upon the accuracy and completeness of the financial information provided to it
by Midwest and Mahaska. In its review, with the consent of the Midwest board,
Charles Webb & Company did not undertake any independent verification of the
assets or liabilities nor of potential exposure resulting from year 2000 issues,
if any, of Midwest or Mahaska, and potential or contingent liabilities of
Midwest or Mahaska.

         In rendering its opinion, Charles Webb & Company analyzed the
consideration offered by Mahaska in relation to the following:

                  -        the results of the marketing efforts to solicit a
                           potential acquiror for Midwest (24 potential
                           acquirors contacted; 12 reviewed confidential
                           information; three preliminary proposals; one final
                           proposal);

                  -        a contribution analysis in which the following ratios
                           were compared for fairness to the Midwest
                           stockholders as part of the resulting combined
                           company:


                                      -38-
<PAGE>   53
<TABLE>
<CAPTION>
                                                                     CONTRIBUTION
                                                           MAHASKA                MIDWEST
<S>                                                        <C>                    <C>
                           Equity                           76.5%                  23.5%

                           Net Income                       76.4                   23.6

                           Proforma shareholder ownership   76.8                   23.2
                           assuming 1 for 1 exchange

</TABLE>

                  -        certain comparable merger and acquisition
                           transactions of pending thrift deals, comparing
                           merger consideration relative to tangible book value,
                           last 12 months earnings, total assets, total deposits
                           and premium to core deposits. Charles Webb & Company
                           analyzed this data in conjunction with the
                           composition of Midwest's earnings, which have a
                           significant component of investment arbitrage
                           earnings relative to earnings from the traditional
                           business of a thrift institution. As of December 31,
                           1998, approximately 34.3% of Midwest's assets consist
                           of investment-related securities. This mitigating
                           factor was important in comparing the pricing of this
                           transaction to those pending thrift deals. Pending
                           thrift deals consist of all thrift acquisitions,
                           announced but not yet closed, as of February 2, 1999.

         The information in the following table summarizes the comparable group
results analyzed by Charles Webb & Company with respect to the merger. The
summary does not purport to be a complete description of the analysis performed
by Charles Webb & Company and should not be construed independently of the other
information considered by Charles Webb & Company in rendering its opinion.
Selecting portions of Charles Webb & Company's analysis or isolating certain
aspects of the comparable transactions without considering all analysis and
factors could create an incomplete or potentially misleading view of the
evaluation process.


                                      -39-
<PAGE>   54

<TABLE>
<CAPTION>
                                  NUMBER    PRICE TO   LAST 12 MONTHS   DEPOSITS   ASSETS   CORE DEPOSIT
                                            TANGIBLE    EARNINGS PER      ( %)       (%)     PREMIUM (c)
                                            BOOK(a)      SHARE (b)                              (%)
                                              (%)             (X)
                                  ------    --------   --------------   --------   ------   ------------
<S>                               <C>       <C>        <C>              <C>        <C>      <C>
Consideration to Midwest (d)                    152         13.0         11.51     17.62        6.26

Median of Pending Deals              33         189         24.5         27.23     20.34       14.15

High of Pending Deals                           403         58.1          76.7     43.44       43.83

Low of Pending Deals                            111         9.95          13.5      9.39        3.12

Summary numbers since 9/30/98:

Median of Pending Deals              21       214.5        24.09         25.97     19.92       16.87

High of Pending Deals                         297.5        47.77         54.27     35.48       35.13

Low of Pending Deals                          111.4         9.95         13.47     10.07        3.12
</TABLE>

- ----------

(a)  Assumes Midwest fully diluted tangible book value of $11.17.

(b)  Last twelve months ended December 31, 1998 earnings per fully diluted share
     of $1.31.

(c)  Calculated by the premium of the purchase price of the book value divided
     by the amount of core deposits. Core deposits include all deposits except
     for certificates of deposit greater than $100,000.

(d)  Based on Mahaska closing price of $16.875 on February 1, 1999 and the
     exchange ratio of 1:1.

     Particular analysis and discussion was given to the pending thrift
transactions that have been announced since the market for financial institution
equities began its market correction in August 1998. As of the date the fairness
opinion was delivered, of all the 33 pending deals, 5 of those had been
announced prior to August 1998. The following information regarding the market
movement was taken into consideration in the fairness presentation:


                                      -40-
<PAGE>   55
<TABLE>
<CAPTION>
                                         % PRICE CHANGE      % PRICE CHANGE FROM
                                              FROM               JULY 31, 1998
                                       DECEMBER 31, 1998
                                       -----------------     -------------------
<S>                                    <C>                   <C>
KBW Index (a)                                (4.52)%               (5.42)%

Thrift Index (b)                             (6.06)                (16.96)

Midwest Stock Price                           0.74                 (12.82)
</TABLE>
- ----------

(a)  The KBW Index is an index of 24 large banking institutions consolidated as
     an index that trades on the Philadelphia Options Exchange. This index
     generally tracks the overall movement in financial institution stocks.

(b)  The Thrift Index used is a group of 19 large thrift holding companies
     consolidated as an index for evaluation purposes.

     Based on the above information, Charles Webb & Company concluded that the
above analysis of the transaction with an implied exchange ratio and implied
deal price of $17.00, which represents a 46% premium over the $11.625 closing
price of Midwest common stock on the day the transaction was announced, is fair
from a financial point of view to the stockholders of Midwest. Further, the
fairness opinion considered:

     -    the relative market performance of Mahaska common stock over the last
          three years versus the performance of Midwest's common stock; and

     -    the expected performance of each company given additional
          considerations such as the business plan, asset mix, funding sources
          and growth potential, net interest margin and net interest spread.

     In preparing its analysis, Charles Webb & Company made numerous assumptions
with respect to industry performance, business and economic conditions and other
matters, many of which are beyond the control of Charles Webb & Company and
Midwest. The analyses performed by Charles Webb & Company are not necessarily
indicative of actual values or future results, which may be significantly more
or less favorable than suggested by those analyses and do not purport to be
appraisals or reflect the prices at which a business may be sold.

     Charles Webb & Company will receive a fee of approximately $190,000 for
services rendered in connection with advising Midwest and issuing a fairness
opinion regarding the merger consideration. As of the date of this proxy
statement/prospectus, Charles Webb & Company has received $50,000 of its fee,
and the remainder of the fee is due upon closing of the merger.


                                      -41-
<PAGE>   56
                              THE MERGER AGREEMENT

EFFECTIVE TIME OF THE MERGER

     The merger shall become effective upon the filing of (a) Articles of Merger
with the Secretary of State of the State of Iowa pursuant to the Iowa Business
Corporation Act and (b) a Certificate of Merger with the Secretary of State of
the State of Delaware pursuant to the Delaware General Corporation Law, unless a
later date and time is specified as the effective time in the articles or
certificate of merger.

     A closing shall take place immediately prior to the effective time on the
last day of a month following the satisfaction or waiver of all the conditions
to consummation of the merger or on any other date as the parties may mutually
agree upon.

EXCHANGE OF MIDWEST COMMON STOCK CERTIFICATES

     After the effective time of the merger, Mahaska will send to each former
holder of record of shares of Midwest common stock transmittal materials for use
in exchanging such stockholder's old certificates for new certificates
representing Mahaska common stock. DO NOT SEND IN YOUR MIDWEST COMMON STOCK
CERTIFICATES WITH YOUR PROXY.

ASSUMPTION OF MIDWEST STOCK OPTIONS

     At the effective time of the merger, each option to purchase Midwest common
stock which is then outstanding, whether or not exercisable, shall be converted
automatically into an option to purchase shares of Mahaska common stock. Mahaska
shall assume each Midwest option, in accordance with the terms of Midwest's
Stock Option and Incentive Plan and the related stock option agreement. All
assumed Midwest options will be exercisable for Mahaska common stock after the
merger. Mahaska has agreed to register the shares of Mahaska common stock
issuable upon exercise of the stock options under the Securities Act.

CONDITIONS TO THE MERGER

     In addition to shareholder approval, the merger agreement provides that
consummation of the merger is subject to the satisfaction of conditions, or the
waiver of these conditions by the party or parties entitled to do so, at or
before the effective time. Each of the parties' obligations under the merger
agreement is subject to the following conditions:

          -    the receipt of all necessary regulatory approvals and consents
               required to consummate the merger by any governmental authority,
               and the expiration of all notice periods and waiting periods with
               respect thereto;

          -    the receipt of the approval or consent of each person whose
               approval or consent is required by law;


                                      -42-
<PAGE>   57
          -    none of Mahaska or Midwest or their respective subsidiaries shall
               be subject to any statute, rule, regulation, order or decree
               which prohibits, restricts or makes illegal the consummation of
               the merger;

          -    the registration statement of which this joint proxy
               statement/prospectus is a part shall have become effective under
               the Securities Act, and Mahaska shall have received all permits,
               authorizations or exemptions necessary under all state securities
               laws to issue Mahaska common stock in connection with the merger,
               and neither the registration statement nor any such permit,
               authorization or exemption shall be subject to a stop order or
               threatened stop order by any governmental authority;

          -    the shares of Mahaska common stock to be issued in connection
               with the merger shall have been approved for listing on the
               Nasdaq National Market;

          -    the receipt of an opinion to the effect that the merger will
               constitute a reorganization within the meaning of Section 368(a)
               of the Internal Revenue Code. See "Federal Income Tax
               Consequences;"

          -    the receipt of a letter from Mahaska's and Midwest's independent
               public accountants to the effect that the merger will be
               accounted for as a pooling of interests; and

          -    the absence of any pending proceeding by a regulatory authority
               to seek an order, injunction or decree which prevents
               consummation of the merger.

     In addition to the conditions described above, the obligations of Mahaska
under the merger agreement are conditioned upon:

          -    the performance in all material respects of all covenants and
               obligations required to be complied with and satisfied by
               Midwest;

          -    the accuracy in all material respects of the representation and
               warranties of Midwest set forth in the merger agreement;

          -    no more than 8% of Midwest stockholders exercising appraisal
               rights;

          -    no material adverse change in the results of operation, condition
               (financial or otherwise), properties, assets or business of
               Midwest and its subsidiaries since December 1997;

          -    the receipt of a certificate from specified officers of Midwest
               with respect to compliance with the conditions relating to the
               first two points immediately above; and


                                      -43-
<PAGE>   58
          -    the receipt by Mahaska of such certificates of Midwest's officers
               or others and such other documents to evidence fulfillment of the
               conditions relating to Midwest as Mahaska may reasonably request.

Any of the foregoing conditions may be waived by Mahaska.

     In addition to the mutual conditions described above, Midwest's obligations
under the merger agreement are conditioned upon:

          -    the accuracy in all material respects of the representations and
               warranties of Mahaska set forth in the merger agreement;

          -    the performance in all material respects of all covenants and
               obligations required to be complied with and satisfied by
               Mahaska;

          -    the receipt of a certificate from specified officers of Mahaska
               with respect to compliance with the conditions relating to the
               first two points immediately above;

          -    no material adverse change in the results of operation, condition
               (financial or otherwise), properties, assets or business of
               Mahaska and its subsidiaries since December 1997; and

          -    the receipt by Midwest of such certificates of Mahaska's officers
               or others and such other documents to evidence fulfillment of the
               conditions relating to them as Midwest may reasonably request.

Any of the foregoing conditions may be waived by Midwest.

REGULATORY APPROVALS

     In order to consummate the merger, Mahaska and Midwest must obtain the
prior consent and approval, as applicable, of the Federal Reserve, the Office of
Thrift Supervision and the Federal Deposit Insurance Corporation.

     The merger is subject to the prior approval of the Office of Thrift
Supervision under the Home Owners' Loan Act, the Federal Reserve under the Bank
Holding Company Act of 1956, and the Federal Deposit Insurance Corporation under
the provisions of the Federal Deposit Insurance Act. The Office of Thrift
Supervision, the Federal Reserve or the Federal Deposit Insurance Corporation
may not approve the merger if:

          -    the transaction would result in a monopoly or would be in
               furtherance of any combination or conspiracy to monopolize or
               attempt to monopolize the business of banking in any part of the
               United States; or


                                      -44-
<PAGE>   59
          -    the effect of the transaction, in any section of the country, may
               be to substantially lessen competition, or tend to create a
               monopoly, or in any other manner to restrain trade, in each case
               unless the Office of Thrift Supervision, the Federal Reserve or
               the Federal Deposit Insurance Corporation, as applicable, finds
               that the anticompetitive effects of the proposed transaction are
               clearly outweighed in the public interests by the probable effect
               of the transaction in meeting the convenience and needs of the
               community to be served.

     In conducting its review of any application for approval, each of the
Office of Thrift Supervision, the Federal Reserve and the Federal Deposit
Insurance Corporation is required to consider whether the financial and
managerial resources of the acquiring holding company and acquiring financial
institution are adequate. This includes consideration by a variety of means of
the competence, experience and integrity of the applicant's directors, officers
and principal shareholders and compliance with, among other things, fair lending
laws. Each of the Office of Thrift Supervision, the Federal Reserve and the
Federal Deposit Insurance Corporation has the authority to deny an application
if it concludes that the combined organization would have an inadequate capital
position or if the acquiring organization does not meet the requirements of the
Community Reinvestment Act of 1977, as amended.

     A transaction approved by the applicable federal banking of thrift agency
generally may not be consummated until 30 days after approval by such agency. If
the U.S. Department of Justice and the relevant agency otherwise agree, this
30-day period may be reduced to as few as 15 days. During such period, the U.S.
Department of Justice may commence a legal action challenging the transaction
under the antitrust laws. The commencement of an action would stay the
effectiveness of the approval of the federal banking or thrift agency unless a
court specifically orders otherwise. If, however, the U.S. Department of Justice
does not commence a legal action during such waiting period, it may not
thereafter challenge the transaction except in an action commenced under Section
2 of the Sherman Antitrust Act.

     Applications have been filed with applicable regulatory authorities for
approval of the merger. Although neither Mahaska nor Midwest is aware of any
basis for disapproving the merger, there can be no assurance that all requisite
approvals will be obtained, that such approvals will be received on a timely
basis or that such approvals will not impose conditions or requirements which,
individually or in the aggregate, would so materially reduce the economic or
business benefits of the transactions contemplated by the merger agreement to
Mahaska and Midwest that, had such condition or requirement been known, neither
Mahaska nor Midwest, in its reasonable judgment, would have entered into the
merger agreement. If any such condition or requirement is imposed, the merger
agreement permits the board of directors of Mahaska or Midwest to terminate the
merger agreement.

BUSINESS PENDING THE MERGER

     The merger agreement contains certain covenants of the parties regarding
the conduct of their respective businesses pending consummation of the merger.
Pending consummation of the merger, Mahaska, Midwest and their respective
subsidiaries generally are required to conduct


                                      -45-
<PAGE>   60
their respective businesses in the ordinary course consistent with past practice
and to use all reasonable efforts to preserve their respective business
organizations intact. In addition, Midwest shall not, without Mahaska's prior
consent, among other things,

          -    declare any dividend on the Midwest common stock in excess of
               $.10 per share per quarter;

          -    issue any shares of its capital stock or rights to acquire the
               same, other than upon exercise of outstanding options;

          -    effect any recapitalization, reclassification, stock dividend,
               stock split or like change in capitalization;

          -    take specified actions with respect to its business, including
               without limitation increase the rate of compensation of its
               directors, officers or employees, enter into or modify any
               employee benefit plan, change its methods of accounting or tax
               reporting, purchase or sell assets, make capital expenditures,
               enter into contracts with respect to branch offices, acquire any
               business entity, except in the case of each as permitted by the
               merger agreement;

          -    enter into any new line of business, enter into futures, options
               and similar contracts;

          -    amend its certificate and bylaws, or other governing instruments;

          -    knowingly take any action that would prevent or impede the merger
               from qualifying for pooling of interests accounting or as a
               reorganization under the Internal Revenue Code; or

          -    knowingly take any action that would result in any of its
               representations and warranties not being true and correct in any
               material respect at or prior to the effective time or in any of
               the conditions to the merger set forth in the merger agreement
               not being satisfied.

NO SOLICITATION

     Pursuant to the merger agreement, Midwest cannot solicit or encourage
inquiries or proposals with respect to, furnish any information relating to, or
participate in any negotiations or discussions concerning, any acquisition,
lease or purchase of Midwest unless required to do so as a result of Midwest's
board's fiduciary duties under applicable law. Midwest will inform Mahaska of
any such request for information or of any negotiations or discussions.

TERMINATION AND AMENDMENT

     The merger agreement may be terminated:


                                      -46-
<PAGE>   61
          -    by mutual consent of the parties;

          -    by either party if the shareholders of Mahaska or stockholders of
               Midwest do not approve the merger agreement;

          -    by a non-breaching party if the other party (a) breaches any
               material agreement contained in the merger agreement not cured or
               adequate assurance of a cure given within 5 days or (b)
               materially breaches any representations or warranties contained
               in the merger agreement if such breach has not been cured within
               30 days;

          -    Mahaska if certain required regulatory approvals or consents for
               consummation of the merger are not obtained; or

          -    by either Mahaska or Midwest if the merger is not consummated by
               September 30, 1999.

In the event of termination, the merger agreement shall become null and void,
except for provisions relating to expenses and confidentiality.

     The merger agreement may be amended or supplemented at any time by written
agreement of the boards of directors of the parties whether before or after the
approval of the shareholders of Mahaska or stockholders of Midwest, subject to
certain legal limitations set forth in the merger agreement.

INTERESTS OF CERTAIN PERSONS IN THE MERGER

     Certain directors and executive officers of Midwest have interests in the
merger in addition to their interests as stockholders generally. The Midwest
board was aware of these factors and considered them, among other matters, in
approving the merger agreement and the transactions contemplated thereby.

     Mahaska has agreed that William D. Hassel, who is currently a director of
Midwest, will become a director of Mahaska until the next annual meeting of
shareholders and in which capacity he will receive a fee for his service as
director of $300 per month and a quarterly retainer of $625.

     As of the effective time of the merger, Mr. Hassel, the current President
and Chief Executive Officer of Midwest, will be President and Chief Executive
Officer of Midwest Federal Savings and Robert D. Maschmann, Chief Financial
Officer of Midwest, will be Executive Vice President and Chief Financial Officer
of Midwest Federal Savings.

     Midwest Federal Savings will enter into employment agreements with Mr.
Hassel and Mr. Maschmann at the effective time of the merger. The agreements
will provide, among other things, that in the event that, in connection with or
within one year of a "change in control," of Mahaska or Midwest Federal Savings,
Midwest Federal Savings terminates Mr. Hassel or Mr. Maschmann for any reason
other than for just cause or causes a material reduction in Mr.


                                      -47-
<PAGE>   62
Hassel's or Mr. Maschmann's responsibilities, authority, compensation or other
benefits, then Mr. Hassel or Mr. Maschmann, as the case may be, will be entitled
to receive a severance payment equal to three times his average annual
compensation. In addition, for terminating prior employment agreements, Mr.
Hassel and Mr. Maschmann will receive payments of $120,000 and $90,000 at the
effective time of the merger.

     Mahaska also agreed to indemnify directors and executive officers and
maintain Midwest's existing directors' and officers' liability insurance policy
(or a policy providing coverage on substantially the same terms and conditions)
for acts or omissions occurring prior to the effective time by persons who are
currently covered by such insurance policy maintained by Midwest for a period of
three years following the effective time of the merger.

EMPLOYEE MATTERS

     Pursuant to a letter agreement executed simultaneously with the merger
agreement, Mahaska will take all reasonable action so that employees of Midwest
and its subsidiaries will be entitled to participate in the Mahaska employee
benefit plans of general applicability to the same extent as similarly-situated
employees of Mahaska and its subsidiaries. Mahaska and the Mahaska employee
benefit plans will recognize years of service with Midwest or any Midwest
subsidiary as such service is recognized by and reflected on the records of
Midwest and the Midwest employee benefit plans.

     All employees of Midwest as of the effective time of the merger shall
become employees of Mahaska or remain employees of Midwest Federal Savings,
provided that Mahaska or a Mahaska subsidiary shall have no obligation to
continue the employment of any such person and nothing contained in the merger
agreement shall give any employee of Midwest or any Midwest subsidiary a right
to continuing employment with Mahaska or any Mahaska subsidiary.

RESALE OF MAHASKA COMMON STOCK

     The Mahaska common stock issued pursuant to the merger will be freely
transferable under the Securities Act, except for shares issued to any Midwest
stockholder who may be deemed to be an affiliate of Mahaska for purposes of Rule
144 promulgated under the Securities Act or an affiliate of Midwest for purposes
of Rule 145 promulgated under the Securities Act. Affiliates will include
persons, generally executive officers, directors and 10% stockholders, who
control, are controlled by or are under common control with (a) Mahaska or
Midwest at the time of the Midwest annual meeting or (b) Mahaska at or after the
effective time.

     Rules 144 and 145 will restrict the sale of Mahaska common stock received
in the merger by affiliates and certain of their family members and related
interests. Generally speaking, during the year following the effective time of
the merger, those persons who are affiliates of Midwest at the time of the
annual meeting may publicly resell any Mahaska common stock received by them in
the merger, subject to certain limitations as to, among other things, the amount
of Mahaska common stock sold by them in any three-month period and as to the
manner of sale. After the one-year period, affiliates may resell their shares
without such restrictions.


                                      -48-
<PAGE>   63
     Mahaska and Midwest have agreed to use their reasonable best efforts to
cause each person who may be deemed to be an affiliate (for purposes of Rule 145
and for purposes of qualifying the merger for pooling of interests accounting
treatment) to deliver to Mahaska a letter agreement intended to preserve the
ability to treat the merger as a pooling of interests and, in the case of
affiliates of Midwest, to ensure compliance with the Securities Act. See "-
Letter Agreements."

     This joint proxy statement/prospectus does not cover any resales of Mahaska
common stock to be received by Midwest stockholders upon consummation of the
merger, and no person is authorized to make any use of this joint proxy
statement/prospectus in connection with any resale.

FEDERAL INCOME TAX CONSEQUENCES

     The following is a summary description of material federal income tax
consequences of the merger to stockholders of Midwest. The federal income tax
laws are complex and the tax consequences of the merger may vary depending upon
each shareholder's individual circumstances or tax status. Accordingly, this
summary is not a complete description of all of the consequences of the merger
and, in particular, may not address federal income tax considerations that may
affect the treatment of a stockholder which, at the effective time, already owns
some Mahaska common stock, is not a U.S. citizen, is a tax-exempt entity, is a
financial institution or an insurance company, is an individual who acquired
Midwest common stock pursuant to an employee stock option or right or otherwise
as compensation, or who or which exercises some form of control over Midwest. In
addition, no information is provided herein with respect to the tax consequences
of the merger under applicable foreign, state or local laws. This summary is
based on laws, regulations, rulings and judicial decisions as in effect on the
date of this joint proxy statement/prospectus, without consideration of the
particular facts or circumstances of any holder of Midwest common stock. These
authorities are all subject to change and any such change may be made with
retroactive effect. No assurance can be given that, after any such change, this
summary would not be different.

     Consequently, each stockholder of Midwest is urged to consult his or her
own tax advisor concerning the specific federal and any foreign, state and local
income tax and other tax consequences of the merger applicable to such
stockholder.

THE MERGER.   Mahaska and Midwest have received an opinion from KPMG LLP, which
is based on facts, representations and assumptions that were provided by Midwest
and Mahaska and that are consistent with the facts that Midwest and Mahaska
believe will be existing as of the effective time. On the basis of such facts,
representations and assumptions, KPMG LLP has opined that for federal income tax
purposes:

          -    the merger, when consummated in accordance with the terms of the
               merger agreement and certain related documentation, will
               constitute a reorganization within the meaning of Section 368(a)
               of the Internal Revenue Code;


                                      -49-
<PAGE>   64
          -    no gain or loss will be recognized by stockholders of Midwest
               upon the exchange of their Midwest common stock solely for shares
               of Mahaska common stock pursuant to the merger;

          -    the basis of the Mahaska common stock received by a Midwest
               stockholder receiving solely Mahaska common stock will be the
               same as his or her basis in the Midwest common stock surrendered
               in exchange therefor; and

          -    the holding period of the shares of Mahaska common stock received
               by a Midwest stockholder receiving solely Mahaska common stock
               will include the period during which such Midwest stockholder
               held the Midwest common stock surrendered in exchange therefor,
               provided the surrendered Midwest common stock was held by the
               stockholder as a capital asset at the effective time of the
               merger.

     A holder of Midwest stock who exercises appraisal rights under applicable
Delaware law and who receives a cash payment of the fair value of the holder's
shares of Mahaska common stock will be treated as having received such payment
in redemption of such shares. Such redemption will be subject to the conditions
and limitations of Sections 302 and 318 of the Internal Revenue Code. In
general, if the shares of Midwest common stock are held by the holder as a
capital asset at the effective time of the merger, a dissenting holder will
recognize capital gain or loss measured by the difference between the amount of
cash received by such holder and the basis for such shares. If, however, such
holder owns, either actually or constructively, any other Mahaska common stock,
the payment made to such holder could be treated as a dividend. In general,
under the constructive ownership rules of the Internal Revenue Code, a holder
may be considered to own stock that is owned, and in some cases constructively
owned, by certain related individuals or entities, as well as stock that such
holder (or related individuals or entities) has the right to acquire by
exercising an option or converting a convertible security. Each holder of
Midwest common stock who contemplates exercising appraisal rights should consult
his or her own tax advisor as to the federal and other tax consequences of such
actions, including the possibility that the payment will be treated as dividend
income.

ACCOUNTING TREATMENT OF THE MERGER

     It is expected that the merger will be accounted for as a pooling of
interests under generally accepted accounting principles, and it is a condition
to the obligations of Mahaska and Midwest to consummate the merger that Mahaska
and Midwest receive a letter, dated as of the closing, from KPMG LLP to the
effect that the merger qualifies for such accounting treatment. See "The Merger-
Conditions to the Merger."

     As required by generally accepted accounting principles, under pooling of
interests accounting, as of the effective time of the merger, the assets and
liabilities of Midwest would be added to those of Mahaska at their recorded book
values and the shareholders' and stockholders' equity accounts of Mahaska and
Midwest would be combined on Mahaska's consolidated


                                      -50-
<PAGE>   65
balance sheet. On a pooling of interests accounting basis, income and other
financial statements of Mahaska issued after consummation of the merger would be
restated retroactively to reflect the combined financial position and results of
operations of Mahaska and Midwest as if the merger had taken place prior to the
periods covered by such financial statements. The unaudited pro forma financial
information contained in this joint proxy statement/prospectus has been prepared
using the pooling of interests accounting method to account for the merger. See
"Selected Pro Forma Financial Data" and "Pro Forma Financial Data."

EXPENSES OF THE MERGER

     Mahaska and Midwest have agreed that each party will pay all costs and
expenses incurred by it in connection with the transactions contemplated by the
merger agreement, including fees and expenses of its own financial consultants,
accountants and counsel, except that the registration fee to be paid to the
Commission in connection with this joint proxy statement/prospectus and filing
fees with other regulatory agencies will be paid by Mahaska. The merger
agreement also provides that Midwest's expenses should not exceed $300,000,
exclusive of the financial advisory fee and expenses of Charles Webb & Company.

LETTER AGREEMENTS

     In connection with the execution of the merger agreement, directors and
executive officers of Midwest and Mahaska agreed to certain restrictions on the
transfer of shares of Mahaska common stock and Midwest common stock which are
intended to ensure that the merger will be accounted for as a pooling of
interests under generally accepted accounting principles and, in the case of
directors and executive officers of Midwest, compliance with applicable federal
securities laws in connection with the transfer of shares of Mahaska common
stock received by them upon consummation of the merger. See "The Merger - Resale
of Mahaska Common Stock."

APPRAISAL RIGHTS

     MAHASKA. In the event that the merger is consummated, shareholders of
Mahaska common stock are entitled to dissenters' rights in connection with the
merger.

     Iowa law provides dissenters' rights for Mahaska shareholders that object
to the merger and meet the statutory requirements contained in Sections 490.1301
through .1331 of the Iowa Business Corporations Act. Under Iowa law, a
shareholder of a corporation participating in a merger that requires shareholder
approval is entitled to dissenters' rights. Therefore, since the shareholders of
Mahaska must approve the merger between Mahaska and Midwest, the Mahaska
shareholders have dissenters' rights. By exercising dissenters' rights, a
shareholder may receive cash from Mahaska in the amount of the fair value of his
or her shares.

     Although the summary below in no way purports to be a complete statement of
the provisions of Sections 1301 through 1331 regarding dissenters' rights, it is
intended to provide


                                      -51-
<PAGE>   66
Mahaska shareholders with a basic understanding of what Sections 1301 through
1331 require of you.

     Under Iowa law, if you, as a shareholder of Mahaska, wish to assert
dissenters' rights, you must do all of the following:

          -    before the vote on the merger is taken, you must deliver written
               notice to Mahaska of your intent to demand payment for your
               shares of stock;

          -    you cannot vote your shares of stock in favor of the merger,

          -    when you receive a dissenters' notice from Mahaska, you must
               demand payment and certify that you acquired your shares of
               Mahaska before the date required in the dissenters' notice; and

          -    you must deposit the certificate or certificates representing
               your shares of stock in accordance with the terms of the
               dissenters' notice.

     Sections 1301 through 1331 outline the steps you must take to exercise your
dissenters' rights. The provisions for demanding dissenters' rights are complex
and must be complied with fully. You may lose your dissenters' rights if you
fail in any way to comply with the steps provided by Sections 1301 through 1331.
If you have a beneficial interest in Mahaska common stock that is held of record
in the name of another person such as a trustee or nominee, then you must act
promptly to cause the record holder to follow the requirements of Sections 1301
through 1331.

     If you wish to exercise your dissenters' rights as a Mahaska shareholder,
you should carefully review Sections 1301 through 1331, attached to this joint
proxy statement/prospectus as Annex V.

     Any demands, notices, certificates or other documents to be delivered to
Mahaska may be sent to:

                  Karen K. Baack
                  Secretary
                  Mahaska Investment Company
                  222 First Avenue East
                  Oskaloosa, Iowa 52577

     MIDWEST. In the event that the merger is consummated, any holder of shares
of Midwest common stock who objects to the merger is entitled to dissent from
the merger and to have the fair value of such shares as determined by Midwest,
or if necessary, judicially determined, paid to him or her, by complying with
the provisions of Section 262 of the Delaware General Corporation Law. Failure
to take any steps set forth in Section 262 in connection with the exercise of
such rights may result in termination or waiver of those rights.


                                      -52-
<PAGE>   67
     If you are entitled to appraisal rights and you wish to exercise them, you
should carefully review Section 262, the text of which is attached as Annex VI
to this joint proxy statement/prospectus.

     If the merger is completed, holders of Midwest common stock who do not vote
in favor of the merger and who have otherwise fully complied with the provisions
of Section 262 may have the right to require Mahaska to pay them the appraised
value of their Midwest common stock. Shares of Midwest common stock which are
outstanding immediately prior to the effective time and which are held by
stockholders who have:

          -    not voted their Midwest common stock in favor of the merger;

          -    delivered to Midwest a written demand for appraisal of such
               Midwest common stock prior to the Midwest annual meeting for
               consideration of the merger, in the manner provided in Section
               262; and

          -    continuously held such Midwest common stock from the date of the
               written demand for appraisal through the effective time of the
               merger,

will not be converted into or represent the right to receive the Mahaska common
stock, but instead the holders thereof shall be entitled to payment of the
appraised value of such dissenting shares in accordance with Section 262. A
proxy or vote against adoption of the merger agreement does not constitute such
a demand. A stockholder electing to take such action must do so by a separate
written demand that reasonably informs Midwest of the identity of the
stockholder of record and of the stockholder's intention to demand the appraisal
of such holder's Midwest common stock.

     If you fail to take any necessary steps, a termination or waiver of the
rights under such Section 262 will occur. If you have a beneficial interest in
Midwest common stock that is held of record in the name of another person such
as a trustee or nominee, then you must act promptly to cause the record holder
to follow the requirements of Section 262 in a timely manner if you elect to
demand appraisal of your shares.

     Any holder of Midwest common stock who has duly demanded an appraisal in
compliance with Section 262 will not, after the effective time of the merger, be
entitled to vote the dissenting shares subject to appraisal demand for any
purpose or be entitled to the payment of dividends or other distributions on
those dissenting shares other than those payable or deemed to be payable to
stockholders of record as of a date prior to the effective time.

     Any demands, notices, certificates or other documents to be delivered to
Midwest prior to the merger may be sent to:


                                      -53-
<PAGE>   68
                  Thomas A. Jacobs
                  Secretary
                  Midwest Bancshares, Inc.
                  3225 Division Street
                  Burlington, Iowa 52601

     Any demands, notices, certificates or other documents required to be
delivered to Mahaska after the merger may be sent to:

                  Karen K. Baack
                  Secretary
                  Mahaska Investment Company
                  222 First Avenue East
                  Oskaloosa, Iowa 52577

MANAGEMENT AFTER THE MERGER

     Pursuant to the merger agreement, at the effective time of the merger the
directors of Mahaska will be expanded to include William D. Hassel who serves as
director of Midwest immediately prior to the effective time of the merger. Also,
at the effective time, Mr. Hassel will remain President and Chief Executive
Officer of Midwest Federal Savings.

STOCK OWNERSHIP FOLLOWING THE MERGER

     Based on the number of shares of Midwest common stock outstanding as of the
close of business on _____________, 1999, and assuming that no holder of Midwest
common stock exercises appraisal rights, an aggregate of approximately 1,119,473
shares of common stock of Mahaska will be issued to Midwest stockholders in the
merger. This number of shares assumes that no Midwest common stock will be
issued in connection with currently outstanding Midwest options between now and
the effective time of the merger.

     Midwest's common stockholders will own approximately 1,119,473 Mahaska
shares, or approximately 23.5% of the combined company's outstanding common
stock. Mahaska's shareholders will own approximately 3,636,345, or approximately
76.5%, of the combined company's outstanding common stock.

     If all of the shares that could be issued upon exercise of Mahaska's
options and Midwest's options that are in-the-money were outstanding on
_____________, 1999, Midwest's stockholders would own approximately ____% of the
combined company's outstanding common stock and Mahaska shareholders would own
approximately ___% of the combined company's outstanding common stock.

     In addition, an aggregate of _______ shares of Mahaska common stock are
issuable pursuant to the exercise of Midwest, vested options that are currently
out-of-the-money.


                                      -54-
<PAGE>   69
     These numbers of shares and percentages are subject to change if the
capitalization of Mahaska or Midwest changes after _____________, 1999 and
before the effective time of the merger, and there can be no assurance as to the
actual capitalization of Mahaska of Midwest at the effective time or of the
combined company at any time after the effective time.


                                      -55-
<PAGE>   70
                         PRO FORMA FINANCIAL INFORMATION

     The following pro forma condensed statement of financial condition combines
the consolidated historical statements of financial condition of Mahaska and
Midwest, assuming the merger was consummated as of March 31, 1999 and accounted
for as a pooling of interests. The following pro forma condensed statements of
operations present the combined consolidated statements of operations of Mahaska
and Midwest assuming the merger was consummated as of the beginning of the
indicated periods. See "The Merger Agreement - Accounting Treatment ofthe
Merger." Certain insignificant reclassifications have been reflected in the pro
forma information to conform statement presentations.

     The effect of estimated merger-related costs in connection with the merger
has been reflected in the pro forma condensed statement of financial condition,
however, because the estimated merger-related costs are nonrecurring, they have
not been reflected in the pro forma condensed statements of operations. The pro
forma financial data does not reflect cost savings, operating synergies and
revenue enhancements which may be realized after the merger.

     The pro forma information presented is not necessarily indicative of the
results of operations or the combined financial position that would have
resulted had the merger been consummated at March 31, 1999 or at the
beginning of the periods indicated, nor is it necessarily indicative of the
results of operations in future periods or the future financial position of the
combined entities.

     The pro forma information should be read in conjunction with the historical
consolidated financial statements of Mahaska and Midwest, including the related
notes, incorporated by reference herein, and the selected consolidated and other
pro forma financial information, including the notes thereto, appearing
elsewhere in this joint proxy statement/prospectus. See "Where you can Find More
Information" and "Selected Pro Forma Consolidated Financial Data."


                                      -56-
<PAGE>   71
              PRO FORMA CONDENSED STATEMENT OF FINANCIAL CONDITION
                              MAHASKA AND MIDWEST
                                 MARCH 31, 1999
                      (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                      MAHASKA         MIDWEST      ADJUSTMENTS    PRO FORMA
                                                                                                  COMBINED
<S>                                                  <C>             <C>           <C>           <C>
ASSETS:
Cash and due from banks .......................      $   7,510       $  1,144      $    --       $   8,654
Interest-bearing deposits in banks ............          1,892          2,529           --           4,421
Federal funds sold ............................          8,734             --           --           8,734
                                                     ---------       --------        -----       ---------
Cash and cash equivalents .....................         18,136          3,673           --          21,809
Investment securities:
Available for sale ............................         30,456         37,185           --          67,641
Held to maturity ..............................         14,851         23,366           --          38,217
Net loans .....................................        170,161         94,492         (400)(2)    264,253
Loan pool participations ......................         50,536            --            --           50,536
Premises and equipment, net ...................          3,995          2,420           --           6,415
Accrued interest receivable ...................          3,095          1,312           --           4,407
Unamortized goodwill ..........................          5,401             --           --           5,401
Other assets ..................................          2,624          2,535           --           5,159
                                                     ---------       --------        -----       ---------
Total assets ..................................        299,255        164,983         (400)          463,838
                                                     =========       ========        =====       =========

LIABILITIES AND SHAREHOLDERS' EQUITY:
Deposits
Demand ........................................      $  19,409       $    765      $    --       $  20,174
NOW and Super NOW .............................         33,133          7,907           --          41,040
Savings .......................................         66,126         24,938           --          91,064
Certificates of deposit .......................        114,861         73,924           --         188,785
                                                     ---------       --------        -----       ---------
Total deposits ................................        233,529        107,534           --         341,063
Federal Home Loan Bank advances ...............          7,588         44,000           --          51,588
Notes payable .................................         16,200             --           --          16,200
Other liabilities .............................          3,194          1,095          475(2)        4,764
                                                     ---------       --------        -----       ---------
Total liabilities .............................        260,511        152,629          475         413,615
                                                     ---------       --------        -----       ---------
Shareholders' equity:
Common stock ..................................         19,038             11        5,481(1)       24,530
Capital surplus ...............................             17          1,841       (1,858)(1)           --
Treasury stock at cost ........................         (2,799)            --           --          (2,799)
Retained earnings .............................         22,418         10,165       (4,498)(1)(2)   28,085
Accumulated other comprehensive income ........             70            337           --             407
                                                     ---------       --------        -----       ---------
Total shareholders' equity ....................         38,744         12,354         (875)          50,223
                                                     ---------       --------        -----       ---------
Total liabilities and shareholders' equity ....      $ 299,255       $164,983      $  (400)      $ 463,838
                                                     =========       ========        =====       =========
Book value per common share ...................      $   10.65       $  11.25                    $   10.61
Tangible book value per share .................      $    9.17       $  11.25                    $    9.47
Total shares outstanding ......................          3,636          1,099                        4,735
</TABLE>

- ----------

(1)  The merger will be accounted for under the pooling of interests method of
     accounting whereby the historical basis of the assets and liabilities of
     both Mahaska and Midwest will be retained. In connection with the merger,
     Mahaska will issue one share of Mahaska common stock for one of Midwest
     common stock.

(2)  In connection with the merger, Mahaska and Midwest expect to incur costs to
     effect the merger, which include transaction costs of the merger.  Such
     costs will be deducted in determining net income in the period they are
     incurred.  These costs, after tax, are estimated to be approximately
     $875,000 which includes $850,000 of transaction costs (including investment
     advisors and legal fees), $400,000 in additional provision for loan losses
     as provided in the merger agreement, and $200,000 related to the
     termination of employment agreements.


                                      -57-
<PAGE>   72
                    PRO FORMA CONDENSED STATEMENT OF INCOME
                              MAHASKA AND MIDWEST
                       THREE MONTHS ENDED MARCH 31, 1999
                      (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                             Mahaska     Midwest    Pro Forma
                                                                                     Combined
                                                             -------     -------    ---------
<S>                                                          <C>         <C>         <C>
Interest income
Loans....................................................    $3,774      $1,907      $5,681
Loan pool participations.................................     2,209          --       2,209
Bank deposits............................................        36          84         120
Federal funds sold.......................................        97          --          97
Investment securities
Available for sale.......................................       446         512         958
Held to maturity.........................................       187         354         541
                                                             ------      ------      ------
Total interest income....................................     6,749       2,857       9,606
                                                             ------      ------      ------
Interest expense
Deposits.................................................     2,288       1,191       3,479
Federal funds purchased                                          --          --          --
FHLB advances............................................       108         592         700
Notes payable............................................       305          --         305
                                                             ------      ------      ------
Total interest expense...................................     2,701       1,783       4,484
                                                             ------      ------      ------
Net interest income......................................     4,048       1,074       5,122
Provision for losses on loans............................       167          12         179
                                                             ------      ------      ------
Net interest income after provision for losses on loans..     3,881       1,062       4,943
                                                             ------      ------      ------
Other income
Service charges..........................................       304          99         403
Data processing..........................................        50          --          50
Other operating..........................................       138           4         142
Investment securities gains (losses).....................        --           3           3
                                                             ------      ------      ------
Total other income.......................................       492         106         598
                                                             ------      ------      ------
Other expense
Salaries and employee benefits...........................     1,337         335       1,672
Occupancy................................................       357          98         455
Federal Deposit Insurance Corporation assessment.........        12          16          28
Professional fees........................................        86          45         131
Other operating..........................................       614         221         835
Amortization of goodwill.................................       149          --         149
                                                             ------      ------      ------
Total other expense......................................     2,555         715       3,270
                                                             ------      ------      ------
Income before income taxes...............................     1,818         453       2,271
Income taxes.............................................       661         118         779
                                                             ------      ------      ------
Net income...............................................    $1,157      $  335      $1,492
                                                             ======      ======      ======
Earnings per share
 -- Basic................................................    $ 0.32      $ 0.31      $ 0.32
                                                             ======      ======      ======
 -- Diluted..............................................    $ 0.31      $ 0.30      $ 0.31
                                                             ======      ======      ======
Average weighted shares outstanding - basic..............     3,636       1,096       4,732
Average weighted shares outstanding - diluted............     3,758       1,111       4,869
</TABLE>


                                      -58-
<PAGE>   73
                    PRO FORMA CONDENSED STATEMENT OF INCOME
                              MAHASKA AND MIDWEST
                       THREE MONTHS ENDED MARCH 31, 1998
                      (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                            Mahaska     Midwest     Pro Forma
                                                                                     Combined
                                                            -------     -------     ---------
<S>                                                         <C>         <C>         <C>
Interest income
Loans.....................................................   $3,400      $1,848      $5,248
Loan pool participations..................................    2,464          --       2,464
Bank deposits.............................................       41          54          95
Federal funds sold........................................      107          --         107
Investment securities
Available for sale........................................      372         629       1,001
Held to maturity..........................................      250         280         530
                                                             ------      ------      ------
Total interest income.....................................    6,634       2,811       9,445
                                                             ------      ------      ------
Interest expense
Deposits..................................................    2,169       1,230       3,399
Federal funds purchased                                          --          --          --
FHLB advances.............................................       89         541         630
Notes payable.............................................      254          --         254
                                                             ------      ------      ------
Total interest expense....................................    2,512       1,771       4,283
                                                             ------      ------      ------
Net interest income.......................................    4,122       1,040       5,162
Provision for losses on loans.............................      110          12         122
                                                             ------      ------      ------
Net interest income after provision for losses on loans...    4,012       1,028       5,040
                                                             ------      ------      ------
Other income
Service charges...........................................      288          81         369
Data processing...........................................       48          --          48
Other operating...........................................       79           7          86
Investment securities gains (losses)......................       26          36          62
                                                             ------      ------      ------
Total other income........................................      441         124         565
                                                             ------      ------      ------
Other expense
Salaries and employee benefits............................    1,157         326       1,483
Occupancy.................................................      324         102         426
Federal Deposit Insurance Corporation assessment..........       12          17          29
Professional fees.........................................       86          36         122
Other operating...........................................      475         211         686
Amortization of goodwill..................................      153          --         153
                                                             ------      ------      ------
Total other expense.......................................    2,207         692       2,899
                                                             ------      ------      ------
Income before income taxes................................    2,246         460       2,706
Income taxes..............................................      816         149         965
                                                             ------      ------      ------
Net income................................................   $1,430      $  311      $1,741
                                                             ======      ======      ======
Earnings per share
 -- Basic.................................................   $ 0.39      $ 0.30      $ 0.37
                                                             ======      ======      ======
 -- Diluted...............................................   $ 0.37      $ 0.28      $ 0.35
                                                             ======      ======      ======
Average weighted shares outstanding - basic...............    3,673       1,027       4,700
Average weighted shares outstanding - diluted.............    3,884       1,102       4,986
</TABLE>


                                      -59-
<PAGE>   74





                      [THIS PAGE LEFT INTENTIONALLY BLANK]










                                       60
<PAGE>   75
                    PRO FORMA CONDENSED STATEMENT OF INCOME
                              MAHASKA AND MIDWEST
                          YEAR ENDED DECEMBER 31, 1998
                      (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                             Mahaska      Midwest     Pro Forma
                                                                                       Combined
                                                             -------      -------     ---------
<S>                                                          <C>          <C>         <C>
Interest income
Loans                                                        $15,026      $ 7,537      $22,563
Loan pool participations                                       7,970           --        7,970
Bank deposits                                                    122          100          222
Federal funds sold                                               338           --          338
Investment securities
Available for sale                                             1,617        2,362        3,979
Held to maturity                                                 893        1,343        2,236
                                                             -------      -------      -------
Total interest income                                         25,966       11,342       37,308
                                                             -------      -------      -------
Interest expense
Deposits                                                       8,999        4,925       13,924
Federal funds purchased                                           12           --           12
FHLB advances                                                    405        2,302        2,707
Notes payable                                                  1,074           --        1,074
                                                             -------      -------      -------
Total interest expense                                        10,490        7,227       17,717
                                                             -------      -------      -------
Net interest income                                           15,476        4,115       19,591
Provision for losses on loans                                  1,179           48        1,227
                                                             -------      -------      -------
Net interest income after provision for losses on loans       14,297        4,067       18,364
                                                             -------      -------      -------
Other income
Service charges                                                1,215          376        1,591
Data processing                                                  195           --          195
Other operating                                                  389          170          559
Investment securities gains (losses)                              58          118          176
                                                             -------      -------      -------
Total other income                                             1,857          664        2,521
                                                             -------      -------      -------
Other expense
Salaries and employee benefits                                 4,796        1,349        6,145
Occupancy                                                      1,349          423        1,772
Federal Deposit Insurance Corporation assessment                  47           65          112
Professional fees                                                394           84          478
Other operating                                                1,750          889        2,639
Amortization of goodwill                                         612           --          612
                                                             -------      -------      -------
Total other expense                                            8,948        2,810       11,758
                                                             -------      -------      -------
Income before income taxes                                     7,206        1,921        9,127
Income taxes                                                   2,583          549        3,132
                                                             -------      -------      -------
Net income                                                   $ 4,623      $ 1,372      $ 5,995
                                                             =======      =======      =======
Earnings per share
 -- Basic                                                    $  1.26      $  1.31      $  1.27
                                                             =======      =======      =======
 -- Diluted                                                  $  1.20      $  1.25      $  1.21
                                                             =======      =======      =======
Average weighted shares outstanding - basic                    3,660        1,048        4,708
Average weighted shares outstanding - diluted                  3,842        1,102        4,944
</TABLE>


                                      -61-
<PAGE>   76
                    PRO FORMA CONDENSED STATEMENT OF INCOME
                              MAHASKA AND MIDWEST
                          YEAR ENDED DECEMBER 31, 1997
                      (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                              Mahaska       Midwest    Pro Forma
                                                                                        Combined
                                                              -------       -------    ---------
<S>                                                          <C>            <C>        <C>
Interest income
Loans                                                        $ 12,293       $ 7,075      $19,368
Loan pool participations                                        8,474            --        8,474
Bank deposits                                                     108            75          183
Federal funds sold                                                128            --          128
Investment securities
Available for sale                                              1,705         2,073        3,778
Held to maturity                                                1,249         1,527        2,776
                                                             --------       -------      -------
Total interest income                                          23,957        10,750       34,707
                                                             --------       -------      -------
Interest expense
Deposits                                                        8,378         5,039       13,417
Federal funds purchased                                            32            --           32
FHLB advances                                                     138         1,681        1,819
Notes payable                                                     764            --          764
                                                             --------       -------      -------
Total interest expense                                          9,312         6,720       16,032
                                                             --------       -------      -------
Net interest income                                            14,645         4,030       18,675
Provision for losses on loans                                     417            48          465
                                                             --------       -------      -------
Net interest income after provision for losses on loans        14,228         3,982       18,210
                                                             --------       -------      -------
Other income
Service charges                                                 1,130           282        1,412
Data processing                                                   209            --          209
Other operating                                                   408            52          460
Investment securities gains (losses)                               (8)          220          212
                                                             --------       -------      -------
Total other income                                              1,739           554        2,293
                                                             --------       -------      -------
Other expense
Salaries and employee benefits                                  4,343         1,286        5,629
Occupancy                                                       1,173           365        1,538
Federal Deposit Insurance Corporation assessment                   42            54           96
Professional fees                                                 407            73          480
Other operating                                                 1,717           804        2,521
Amortization of goodwill                                          633            --          633
                                                             --------       -------      -------
Total other expense                                             8,315         2,582       10,897
                                                             --------       -------      -------
Income before income taxes                                      7,652         1,954        9,606
Income taxes                                                    2,594           689        3,283
                                                             --------       -------      -------
Net income                                                   $  5,058       $ 1,265      $ 6,323
                                                             ========       =======      =======
Earnings per share
 -- Basic                                                    $   1.38       $  1.23      $  1.35
                                                             ========       =======      =======
 -- Diluted                                                  $   1.33       $  1.14      $  1.29
                                                             ========       =======      =======
 Average weighted shares outstanding - basic                    3,653         1,032        4,685
 Average weighted shares outstanding - diluted                  3,790         1,108        4,898
</TABLE>


                                      -62-
<PAGE>   77
                    PRO FORMA CONDENSED STATEMENT OF INCOME
                              MAHASKA AND MIDWEST
                          YEAR ENDED DECEMBER 31, 1996
                      (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                              Mahaska       Midwest     Pro Forma
                                                                                         Combined
                                                              -------       -------     ---------
<S>                                                          <C>            <C>         <C>
Interest income
Loans                                                        $ 10,203       $ 6,444      $ 16,647
Loan pool participations                                        9,097            --         9,097
Bank deposits                                                     266            69           335
Federal funds sold                                                 92            --            92
Investment securities
Available for sale                                              1,348         1,903         3,251
Held to maturity                                                1,623         1,747         3,370
                                                             --------       -------      --------
Total interest income                                          22,629        10,163        32,792
                                                             --------       -------      --------
Interest expense
Deposits                                                        7,515         4,727        12,242
Federal funds purchased                                            48            --            48
FHLB advances                                                      --         1,516         1,516
Notes payable                                                     968            --           968
                                                             --------       -------      --------
Total interest expense                                          8,531         6,243        14,774
                                                             --------       -------      --------
Net interest income                                            14,098         3,920        18,018
Provision for losses on loans                                     987            48         1,035
                                                             --------       -------      --------
Net interest income after provision for losses on loans        13,111         3,872        16,983
                                                             --------       -------      --------
Other income
Service charges                                                   922           179         1,101
Data processing                                                   221            --           221
Other operating                                                   437           141           578
Investment securities gains (losses)                              (74)           29           (45)
                                                             --------       -------      --------
Total other income                                              1,506           349         1,855
                                                             --------       -------      --------
Other expense
Salaries and employee benefits                                  3,774         1,182         4,956
Occupancy                                                       1,011           349         1,360
Federal Deposit Insurance Corporation assessment                  282           908         1,190
Professional fees                                                 459            72           531
Other operating                                                 1,683           706         2,389
Amortization of goodwill                                          529            --           529
                                                             --------       -------      --------
Total other expense                                             7,738         3,217        10,955
                                                             --------       -------      --------
Income before income taxes                                      6,879         1,004         7,883
Income taxes                                                    2,385           374         2,759
                                                             --------       -------      --------
Net income                                                   $  4,494       $   630      $  5,124
                                                             ========       =======      ========
Earnings per share
 -- Basic                                                    $   1.20       $  0.59      $   1.07
                                                             ========       =======      ========
 -- Diluted                                                  $   1.19       $  0.56      $   1.05
                                                             ========       =======      ========
Average weighted shares outstanding - basic                     3,744         1,061         4,805
Average weighted shares outstanding - diluted                   3,772         1,124         4,896
</TABLE>


                                      -63-
<PAGE>   78
                    COMPARISON OF THE RIGHTS OF SHAREHOLDERS

     The rights of holders of Mahaska common stock are governed by Iowa
corporate law and Mahaska's articles and bylaws, while the rights of holders of
Midwest common stock are governed by Delaware corporate law and Midwest's
certificate of incorporation and bylaws. Upon consummation of the merger,
stockholders of Midwest will become shareholders of Mahaska and their rights as
shareholders of Mahaska will be governed by the articles and bylaws of Mahaska
and Iowa law.

     The following summary is not intended to be a complete statement of the
differences affecting the rights of Midwest's stockholders, but rather
summarizes the more significant differences affecting the rights of these
stockholders and certain important similarities. The summary is qualified in its
entirety by reference to the certificate of incorporation and bylaws of Midwest,
the articles and bylaws of Mahaska and applicable laws and regulations.

MAHASKA COMMON STOCK

     Mahaska is authorized to issue up to 20,000,000 shares of Mahaska common
stock. Mahaska's articles do not have any preferred stock provisions.

     Each share of Mahaska common stock has the same relative rights and is
identical in all respects with each other share of Mahaska common stock. The
Mahaska common stock is not subject to call for redemption and, at the effective
time of the merger, each share of Mahaska common stock offered hereby will be
fully paid and non-assessable.

     VOTING RIGHTS. The holders of Mahaska common stock possess exclusive voting
rights in Mahaska. Each holder of Mahaska common stock is entitled to one vote
for each share held on all matters voted upon by shareholders, and shareholders
are not permitted to cumulate votes in elections of directors.

     DIVIDENDS. The holders of the Mahaska common stock are entitled to
dividends as they may be declared from time to time by the Mahaska board out of
funds legally available therefor.

     PREEMPTIVE RIGHTS. Holders of Mahaska common stock do not have any
preemptive rights with respect to any shares which may be issued by Mahaska in
the future; thus, Mahaska may issue and sell shares of Mahaska common stock
without first offering them to the existing holders of the Mahaska common stock.

     LIQUIDATION. In the event of any liquidation, dissolution or winding up of
Mahaska, the holders of the Mahaska common stock would be entitled to receive,
after payment of all debts and liabilities of Mahaska, all assets of Mahaska
available for distribution.

     ANTI-TAKEOVER PROVISIONS. Certain provisions of Mahaska's articles and
bylaws which deal with matters of corporate governance and rights of
shareholders might be deemed to have a


                                      -64-
<PAGE>   79
potential anti-takeover effect. These provisions, which are described under
"Comparison of the Rights of Shareholders" below, provide, among other things,

          -    that the board of directors of Mahaska shall be divided into up
               to three classes;

          -    that special meetings of shareholders may only be called by the
               Chairman of the Board, President or the board of directors of
               Mahaska and upon written request by the holders of 50% or more of
               the outstanding voting shares;

          -    that shareholders generally must provide Mahaska advance notice
               of shareholder proposals and nominations for director and provide
               certain specified related information; and

          -    for the authority of the Mahaska board to issue shares of
               authorized but unissued Mahaska common stock.

     These provisions of the articles and bylaws of Mahaska could have the
effect of discouraging an acquisition of Mahaska or purchases of shares of
Mahaska common stock in an acquisition, and could discourage transactions which
might otherwise have a favorable effect on the price of the Mahaska common
stock.

MIDWEST CAPITAL STOCK

     Midwest's authorized capital stock consists of 2,000,000 shares of Midwest
common stock, of which ______ shares were outstanding as of the Midwest record
date, and 500,000 shares of preferred stock, par value $0.01 per share, none of
which is issued and outstanding. The Midwest preferred stock is issuable in
series, each series having the rights and preferences as Midwest's board may fix
and determine.

ISSUANCE OF CAPITAL STOCK

     Under Iowa corporate law and Delaware corporate law, Mahaska and Midwest
may issue shares of their capital stock and rights or options for the purchase
of shares of their capital stock on terms and for consideration as may be
determined by the respective boards. Neither Iowa corporate law nor Mahaska's
articles and bylaws or Delaware corporate law or Midwest's certificate of
incorporation and bylaws require shareholder or stockholder approval of any of
these actions. However, the bylaws of the National Association of Securities
Dealers, Inc. generally require corporations, including Mahaska and Midwest,
with securities which are quoted on the Nasdaq National Market or Nasdaq
SmallCap Market to obtain shareholder or stockholder approval of certain
issuances of common stock and most stock compensation plans for directors,
officers and key employees of the corporation. Shareholder or stockholder
approval of stock-related compensation plans also may be sought in certain
instances in order to qualify these plans for favorable federal income tax and
securities law treatment under current laws and regulations.


                                      -65-
<PAGE>   80
VOTING RIGHTS

     Holders of both Mahaska common stock and Midwest common stock are entitled
to one vote per share on all matters properly presented at meetings of
shareholders or stockholders. Neither Mahaska's articles nor Midwest's
certificate of incorporation permits shareholders or stockholders to cumulate
their votes in an election of directors.

     For additional information relating to voting rights, see "- Limitations on
Acquisitions of Voting Stock and Voting Rights" and "Business Combinations with
Interested Shareholders" below.

PAYMENT OF DIVIDENDS

     Both Mahaska and Midwest can pay dividends on their outstanding shares in
accordance with the terms of Iowa corporate law and Delaware corporate law,
respectively. Iowa corporate law generally provides that, subject to any
restrictions in the corporation's articles of incorporation, a corporation may
make distributions to its shareholders, unless (a) the corporation would not be
able to pay its debts as they become due in the usual course of business or (b)
the corporation's total assets would be less than the sum of its total
liabilities plus the amount that would be needed to satisfy preferential rights
upon dissolution to shareholders who possess preferential rights.

     Delaware corporate law generally provides that, subject to any restrictions
in the corporation's certificate of incorporation, dividends may be declared
from the corporation's surplus or, if there is no surplus, from its net profits
for the fiscal year in which the dividend is declared and/or the preceding
fiscal year. However, if the corporation's capital (generally defined in
Delaware corporate law as the sum of the aggregate par value of all shares of
the corporation's capital stock, where all the shares have a par value and the
board of directors has not established a higher level of capital) has been
diminished to an amount less than the aggregate amount of the capital
represented by the issued and outstanding stock of all classes having a
preference upon the distribution of assets, dividends may not be declared and
paid out of the net profits until the deficiency in the capital has been
repaired.

BOARD OF DIRECTORS

     The articles of Mahaska require that the Mahaska board consist of not less
than five nor more than 15 members and be divided into three classes. Members of
each class shall be elected for a term of three years and until their successors
are elected and qualified. The certificate of incorporation of Midwest provides
that the number of directors shall be fixed from time to time exclusively by the
board of directors pursuant to a resolution adopted by a majority of the total
number of directors which Midwest would have if there were no vacancies on the
board of directors. Midwest's certificate of incorporation also provides that
the Midwest board be divided into three classes, as nearly equal in number as
reasonably possible, and that the members of each class shall be elected for a
term of three years and until their successors are elected and qualified, with
one class being elected annually.


                                      -66-
<PAGE>   81
     Under Mahaska's articles, any vacancies in the board may be filled by the
affirmative vote of a majority of the remaining directors, whether or not a
quorum. Under Midwest's bylaws, any vacancies in the board may be filled by the
affirmative vote of a majority of the directors then in office, though less than
a quorum. Persons elected to fill vacancies on Mahaska's or Midwest's board may
serve until the respective annual meeting of shareholders at which the term of
the class to which the director has been elected expires.

LIMITATIONS ON LIABILITY

     Mahaska's bylaws contain a provision that limits the liability of its
directors. However, this limitation does not effect breaches of their fiduciary
duties as directors. Such limitation does not, however, affect the liability of
a director: (a) in connection with a proceeding by or in the right of Mahaska in
which the director was adjudged liable to Mahaska; or (b) in connection with any
other proceeding charging improper personal benefit to the director, whether or
not involving action in the director's official capacity, in which the director
was adjudged liable on the basis that personal benefit was improperly received
by the director. Mahaska's bylaws provide that it will indemnify its officers
and directors to the fullest extent permitted by applicable law and that this
indemnification will not be deemed exclusive of any other rights to which any
person indemnified may be entitled by law or otherwise.

     The certificate of incorporation of Midwest provides that a director of
Midwest shall not be personally liable to Midwest or its stockholders for
monetary damages for breach of fiduciary duty as a director, except for
liability (a) for any breach of the director's duty of loyalty to Midwest or its
stockholders, (b) for acts or omissions not in good faith or which involve
intentional misconduct or a knowing violation of law, (c) for unlawful payment
of dividend or unlawful stock purchase or redemption, or (d) for any transaction
from which the director derived an improper personal benefit. Midwest's
certificate of incorporation further provides that if Delaware corporate law is
amended to further eliminate or limit the personal liability of directors, then
the liability of a director of Midwest shall be eliminated or limited to the
fullest extent permitted by Delaware corporate law, as so amended. In addition,
any repeal or modification of these provisions by the stockholders of Midwest
shall not adversely affect any right or protection of a director of Midwest
existing at the time of the repeal or modification.

SPECIAL MEETINGS OF THE SHAREHOLDERS/STOCKHOLDERS

     The articles of Mahaska contain a provision pursuant to which special
meetings of shareholders may be called only by the Chairman, President, the
board of directors by action at a meeting or a majority of the board of
directors acting without a meeting or by the Chairman, President or Secretary
upon the written request of the holders of 50% or more of the outstanding
capital stock entitled to vote at a meeting.

     The certificate of incorporation of Midwest contains a provision that
special meetings of stockholders of Midwest may be called only by the board of
directors pursuant to a resolution adopted by a majority of the board.


                                      -67-
<PAGE>   82
SHAREHOLDER/STOCKHOLDER NOMINATIONS AND PROPOSALS

     The articles of Mahaska provide that any action required or permitted by
Chapter 490 of the 1993 Code of Iowa, as amended, or by the articles or the
bylaws of Mahaska, to be taken at a shareholders meeting may be taken without a
meeting or vote, and, except as provided below, without prior notice, if one or
more written consents describing the action taken are signed by the holders of
outstanding shares having not less than 51% of the votes entitled to be cast at
a meeting at which all shares entitled to vote on the action were present and
voted, and the written consents are delivered to the corporation for inclusion
in the minutes or filing with the corporate records. In the event any provision
of Chapter 490 requires that notice of proposed action be given to shareholders
not entitled to vote and the action is to be taken by consent of the voting
shareholders, Mahaska must give all shareholders written notice of the proposed
action at least ten days before the action is taken, in the form and in the
manner required by Chapter 490. Any written consent must bear the date of
signature of each shareholder who signs the consent and no written consent shall
be effective to take the corporate action referred to in the consent unless,
within 60 days of the earliest dated consent delivered in the manner required
above to the corporation, written consents signed by a sufficient number of
holders to take action are delivered. Prompt notice of the taking of corporate
action without a meeting by less than unanimous written consent will be given to
those shareholders who have not consented in writing.

     Midwest's bylaws provide that all nominations for election to the Midwest
board and proposals for any new business, other than those made by the Midwest
board, shall be made by a shareholder who has complied with the notice
provisions in the bylaws. Written notice of a shareholder nomination or written
notice of a shareholder proposal must be communicated to the Secretary of
Midwest and delivered or mailed to and received at the principal executive
offices of Midwest not less than 30 days prior to the date of the meeting;
provided, however, that in the event that less than 40 days' notice or prior
disclosure of the date of the meeting is given or made to stockholders, notice
by the stockholder to be timely must be so received not later than the close of
business on the 10th day following the day on which the notice of the date of
the meeting was mailed or public disclosure was made. Each notice given by a
shareholder with respect to nominations for the election of directors shall set
forth (a) as to each person whom the stockholder proposes to nominate for
election or re-election as a director, all information relating to the person
that is required to be disclosed in solicitations of proxies for election of
directors, or is otherwise required, in each case pursuant to Regulation 14A
under the Exchange Act, including such person's written consent to being named
in the proxy statement as a nominee and to serving as a director if elected; and
(b) as to the stockholder giving the notice (1) the name and address, as they
appear on Midwest's books, of the stockholder and (2) the class and number of
shares of Midwest's capital stock that are beneficially owned by the
stockholder.

     Furthermore, any written notice of a stockholder proposal shall set forth
(a) a brief description of the business desired to be brought before the annual
meeting and the reasons for conducting such business at the annual meeting, (b)
the name and address, as they appear on Midwest's books, of the stockholder who
proposed the business, (c) the class and number of shares of Midwest's capital
stock that are beneficially owned by the stockholder and (d) any material
interest of the stockholder in such business.


                                      -68-
<PAGE>   83
LIMITATIONS ON ACQUISITIONS OF VOTING STOCK AND VOTING RIGHTS

     The certificate of incorporation of Midwest provides that no person shall
directly or indirectly offer to acquire or acquire the beneficial ownership of
(a) more than 10% of the issued and outstanding shares of any class of an equity
security of Midwest, or (b) any securities convertible into, or exercisable for,
any equity securities of Midwest if, assuming conversion or exercise by the
person of all securities of which the person is the beneficial owner which are
convertible into, or exercisable for, the equity securities, but of no
securities convertible into, or exercisable for, the equity securities of which
the person is not the beneficial owner, the person would be the beneficial owner
of more than 10% of any class of an equity security of Midwest. The term
"person" is broadly defined in the articles to prevent circumvention of this
restriction.

     The articles of Mahaska do not contain a similar provision.

MERGERS, CONSOLIDATIONS AND SALES OF ASSETS

     Iowa corporate law requires the approval of the board of directors and,
unless the articles of incorporation provide for a different vote, the
affirmative vote of the holders of a majority of the outstanding stock entitled
to vote thereon for mergers or share exchanges, and for sales, leases or
exchanges of all or substantially all of a company's assets. Iowa corporate law
permits Mahaska to merge with another corporation without obtaining the approval
of shareholders if Mahaska is the surviving corporation of the merger and if:
(a) Mahaska's articles of incorporation will not differ from its articles of
incorporation before the merger; (b) the shareholders of Mahaska will retain the
same number and kind of shares as before the merger; and (c) the number of
voting shares outstanding before the merger plus the number issuable as a result
of the merger will not exceed 20% of the shares of Mahaska's common stock
outstanding immediately prior to the merger. Mahaska's articles do not currently
provide for a lesser vote in the case of mergers.

     Delaware corporate law requires the approval of the board of directors and
the holders of a majority of the outstanding stock of Midwest entitled to vote
thereon for mergers or consolidations, and for sales, leases or exchanges of all
or substantially all of Midwest's assets. Delaware corporate law permits Midwest
to merge with another corporation without obtaining the approval of Midwest's
shareholders if: (a) Midwest is the surviving corporation of the merger; (b) the
merger agreement does not amend Midwest's certificate of incorporation; (c) each
share of Midwest's stock outstanding immediately prior to the effective date of
the merger is to be an identical outstanding or treasury share of Midwest after
the merger; and (d) any authorized but unissued shares or treasury shares of
common stock to be issued or delivered under the plan of merger plus those
initially issuable upon conversion of any other securities or obligations to be
issued or delivered under such plan do not exceed 20% of the shares of the
common stock outstanding immediately prior to the effective date of the merger.

BUSINESS COMBINATIONS WITH INTERESTED STOCKHOLDERS

     The certificate of incorporation of Midwest contains certain provisions
which require the holders of at least 80% of Midwest's outstanding shares of
voting stock to approve certain


                                      -69-
<PAGE>   84
"business combinations," as defined therein, with an "interested stockholder,"
which is generally defined to include any person beneficially owning more than
10% of the outstanding voting stock, or an "affiliate" as defined in the Rules
under the Exchange Act of an "interested stockholder." Midwest's certificate of
incorporation requires the approval of the stockholders in accordance with the
increased voting requirements in connection with any such transactions, except
in certain circumstances such as where the "business combination" has been
approved in advance by a majority of the "disinterested directors," which are
generally, those members of the Midwest Board who are unaffiliated with the
interested stockholder or certain conditions are met. These provisions apply to
any "business combination," which generally is defined to include

          -    any merger or consolidation of Midwest or any subsidiary with any
               interested stockholder;

          -    any sale, lease, exchange, mortgage, pledge, transfer or other
               disposition, in one transaction or a series of transactions, to
               or with any interested stockholder of any assets of Midwest or
               any subsidiary having an aggregate fair market value equaling or
               exceeding 25% or more of the combined assets of Midwest and its
               subsidiaries;

          -    the issuance or transfer by Midwest or any subsidiary, in one
               transaction or a series of transactions, of any securities of
               Midwest or any subsidiary to any interested stockholder in
               exchange for cash, securities or other property, or a
               combination, having an aggregate fair market value equaling or
               exceeding 25% of the combined assets of Midwest and its
               subsidiaries except pursuant to an employee benefit plan of
               Midwest or any subsidiary thereof;

          -    the adoption of any plan or proposal for the liquidation or
               dissolution of Midwest proposed by or on behalf of any interested
               stockholder; and

          -    any reclassification of securities, including any reverse stock
               split, or recapitalization of Midwest, or any merger or
               consolidation of Midwest with any of its subsidiaries or any
               other transaction, whether or not with or into or otherwise
               involving an interested stockholder, which has the effect,
               directly or indirectly, of increasing the proportionate share of
               the outstanding shares of any class of equity or convertible
               securities of Midwest or any subsidiary which is directly or
               indirectly owned by any interested stockholder.

     In addition, Delaware corporate law imposes certain restrictions on
business combinations between Midwest and large stockholders. Midwest has agreed
in the merger agreement that these restrictions will not apply to this merger.

     Mahaska's articles do not contain a similar provision although similar
provisions are available to Mahaska under Iowa law.


                                      -70-
<PAGE>   85
ACQUISITION OF EQUITY SECURITIES

     Midwest's certificate of incorporation requires approval by 80% of the
outstanding voting shares of Midwest before Midwest may directly or indirectly
purchase or otherwise acquire any voting stock beneficially owned by a holder of
5% or more of Midwest's voting stock. Any shares beneficially held by such
person would be excluded in calculating such stockholder approval. The provision
would not apply to a pro rata offer made by Midwest to all of its stockholders
in compliance with the Exchange Act and the rules and regulations thereunder, a
purchase of voting shares pursuant to an open market purchase program approved
by a majority of the Midwest board (including a majority of the disinterested
directors) or a purchase of voting shares by Midwest if the Midwest board
(including a majority of the disinterested directors) has determined, pursuant
to criteria set forth in the certificate of incorporation, that the purchase
price per share does not exceed the fair market value of such voting shares.

     Mahaska's articles do not contain a similar provision.

TRANSFER AGENT

     The transfer agent and registrar for the Mahaska common stock is Illinois
Stock Transfer Company, Chicago, Illinois. The transfer agent and registrar for
the Midwest common stock is First Bankers Trust, Quincy, Illinois.

                                  LEGAL OPINION

     The validity of the Mahaska common stock offered hereby will be passed upon
for Mahaska by Chapman and Cutler, Chicago, Illinois. Certain matters will be
passed upon for Midwest by Silver, Freedman and Taff, L.L.P., Washington, D.C.

                                     EXPERTS

     The consolidated financial statements of Mahaska as of December 31, 1998
and 1997, and for each of the years in the three-year period ended December 31,
1998 have been included and incorporated by reference herein and in the
registration statement in reliance upon the report of KPMG LLP, independent
certified public accountants, appearing elsewhere herein, and upon the authority
of said firm as experts in accounting and auditing.

     The consolidated financial statements of Midwest as of December 31, 1998
and 1997, and for each of the years in the three-year period ended December 31,
1998 have been included and incorporated by reference herein and in the
registration statement in reliance upon the report of KPMG LLP, independent
certified public accountants, appearing elsewhere herein, and upon the authority
of said firm as experts in accounting and auditing.


                                      -71-
<PAGE>   86
                 ADDITIONAL MATTERS FOR MIDWEST'S ANNUAL MEETING

ELECTION OF DIRECTORS

     GENERAL. Midwest's board of directors currently consists of seven members.
The board is divided into three classes, each of which contains approximately
one-third of the board. Approximately one-third of the directors are elected
annually. Directors of Midwest are generally elected to serve for a three-year
period or until their respective successors are elected and qualified.

     The table below sets forth certain information, as of the record date,
regarding the composition of the Midwest's board of directors, including their
terms of office. On January 25, 1999, the board of directors approved the
nominees identified below. It is intended that the proxies solicited on behalf
of the board of directors, other than proxies in which the vote is withheld as
to any nominee, will be voted at the meeting for the election of the nominees
identified below. If any nominee is unable to serve, the shares represented by
all valid proxies will be voted for the election of such substitute as the board
of directors may recommend. At this time, the board of directors knows of no
reason why any nominee might be unable to serve, if elected. There are no
arrangement or understandings between the nominees and any other person pursuant
to which the nominees were selected.

<TABLE>
<CAPTION>
                                                                                    Share of
                                                                                  Common Stock
                             Position(s) Held              Director     Term      Beneficially    Percent of
      Name                   with the Company       Age    Since(1)    Expires      Owned(2)        Class
      ----                   ----------------       ---    --------    -------      --------        -----
<S>                       <C>                       <C>    <C>         <C>        <C>             <C>
Nominees

Henry L. Hirsch           Chairman of the Board      83      1958       2002         29,325         2.65%

Robert D. Maschmann       Executive Vice             43      1992       2002         66,208         5.99
                          President,Treasurer and
                          Director

Directors Continuing in Office

Yuh-Fen (Boni) Lin        Director                   51      1992       2000         43,077         3.90

James E. Witte            Director                   64      1979       2000         36,825         3.33

William D. Hassel         President, Chief           50      1985       2001         70,534(3)      6.38
                          Executive Officer and
                          Director

James R. Walker           Director                   51      1979       2001         45,225         4.09

Edward C. Whitham         Director                   59      1974       2001         13,281         1.20
</TABLE>

- ----------

(1)  Includes service as a director of Midwest Federal Savings.

(2)  Amounts include shares held directly, as well as shares which are held in
     retirement accounts, including Midwest's ESOP, or held by certain members
     of the named individuals' families, or held by trusts of which the named
     individual is a trustee or substantial beneficiary, with respect to which
     shares the respective directors may be deemed to have sole or shared voting
     and/or investment power.

(3)  Amount includes 7,300 shares for Mr. Hassel subject to options which were
     granted under Midwest's stock option plan and are currently exercisable.


                                      -72-
<PAGE>   87
     The business experience of each director is set forth below. All directors
have held their present positions for at least five years unless otherwise
indicated. Each individual has served as a director of Midwest since its
organization in July 1992, with the exception of directors Maschmann and Lin,
who joined the board later that same year.

     ROBERT D. MASCHMANN, age 43, was appointed Executive Vice President of
Midwest and Midwest Federal Savings in April 1994. Prior thereto, Mr. Maschmann
served as Vice President and Treasurer of Midwest Federal Savings since 1989 and
of the Company since 1992. Mr. Maschmann is Midwest's and Midwest Federal
Savings' chief financial and accounting officer, responsible for developing and
implementing financial plans and policies, supervising the accounting functions
and overseeing asset/liability activities. Mr. Maschmann served as Vice
President and Controller of Midwest Federal Savings from 1985 to 1989.

     HENRY L. HIRSCH, age 83, has been of counsel to the law firm of Hirsch,
Adams, Krekel, Putnam, Cahill & Miller since 1994, where he was previously a
partner since 1948. Mr. Hirsch has served as Midwest Federal Savings' General
Counsel since 1958. Mr. Hirsch served as President of Midwest Federal Savings
from 1971 to 1977 and has served as Chairman of the Board since 1977.

     WILLIAM D. HASSEL, age 50, joined Midwest Federal Savings in 1972 as
Comptroller, before being promoted to Treasurer in 1974 and to Chief Financial
Officer in 1983. Mr. Hassel has served as President and Chief Executive Officer
of Midwest Federal Savings since 1989 and as President and Chief Executive
Officer of Midwest since its organization in 1992.

     JAMES R. WALKER, age 51, has been a shareholder in the accounting firm of
Walker & Egerton, P.C. since 1973.

     EDWARD C. WHITHAM, JR., age 59, has been the owner of Financial Management
Accounting, an accounting and tax consulting firm, since 1989. From 1987 to
1989, Mr. Whitham was the President of Financial Management Consultants,
accounting and tax consulting firm. Since 1989, Mr. Whitham has also served as
the business manager/treasurer of Employee Benefit Systems, Inc., a firm that
administers employee benefit plans for governmental bodies, corporations and
businesses.

     YUH-FEN (BONI) LIN, age 51, has been a clinical dietician at Burlington
Medical Center since 1985. She has also been an owner/partner in several motels
in the State of Washington since 1979.

     JAMES E. WITTE, age 64, has been employed by Komick Construction, a real
estate construction, management and maintenance company since 1988, for whom he
has been the maintenance supervisor for the Windsor Beach Homeowners'
Association since 1991. For the two years prior thereto, Mr. Witte was engaged
part-time in farming, and from 1965 to 1985 was the owner/manager of a grain and
livestock farming operation.


                                      -73-
<PAGE>   88
     MEETINGS AND COMPENSATION OF THE BOARD OF DIRECTORS AND COMMITTEES.
Meetings of Midwest's board of directors are generally held on a monthly basis.
The board of directors met 12 times during the fiscal year ended December 31,
1998. During fiscal 1998, no incumbent director of the Company attended fewer
than 75% of the aggregate of the total number of Board meetings and the total
number of meetings held by the committees of the Board of Directors on which he
or she served. Directors of Midwest are not paid a fee for serving on the
Company Board.

     The board of directors has established Midwest's Executive, Audit and
Compensation Committees.

     The Executive Committee exercises the powers of the full board of directors
between board meetings, except that this committee does not have the authority
to amend the charter or bylaws, adopt a plan of merger, consolidation,
dissolution, or provide for the disposition of all or substantially all of the
property and assets of Midwest. The Executive Committee is composed of Directors
Hirsch and Walker. The Executive Committee met one time during the year ended
December 31, 1998.

     The Audit Committee is responsible for selecting Midwest's independent
accountants and meeting with the independent accountants to outline the scope
and review the results of the annual audit. The current members of this
committee are Directors Whitham, Lin and Walker. This committee met one time
during the year ended December 31, 1998.

     The Compensation Committee recommends employee compensation benefits and
personnel policies to the board of directors, as well as salaries and cash bonus
plan distributions concerning executive officers of Midwest and Midwest Federal
Savings. The current members of this committee are Directors Whitham, Lin and
Walker. This committee met one time during the year ended December 31, 1998.

     The full board of directors acts as a Nominating Committee for the annual
selection of its nominees for election as directors. Pursuant to the Midwest's
bylaws, nominations for directors by stockholders must be made in writing and
delivered to the Secretary of Midwest at least 30 days prior to the meeting and
such written nomination must contain certain information as provided in
Midwest's bylaws. While the board of directors will consider nominees
recommended by stockholders, it has not actively solicited nominations.

     The Midwest Federal Savings board of directors meets monthly and may have
additional special meetings. The board of directors met 12 times during the year
ended December 31, 1998. During 1998, no incumbent director of Midwest Federal
Savings attended fewer than 75% of the aggregate of the total number of board
meetings and the total number of meetings held by the committees of the board of
directors on which he or she served. During fiscal 1998, each non-employee
director received $600 per month with no additional compensation paid for
special committee meetings. Employee directors do not receive board fees. No
special committee meetings were held during fiscal 1998.


                                      -74-
<PAGE>   89
     EXECUTIVE OFFICERS WHO ARE NOT DIRECTORS. Thomas A. Jacobs, age 48, is
Senior Vice President in charge of loan operations for Midwest Federal Savings.
His primary responsibilities include overall administration of Midwest Federal
Savings' lending operations, including real estate, consumer and commercial
lending. Mr. Jacobs joined Midwest Federal Savings in 1984 and served in several
capacities in Midwest Federal Savings' lending department prior to being
promoted to his present position in 1989.

     Dennis L. Dietzman, age 48, joined Midwest Federal Savings in 1988 as Vice
President and marketing and business development manager. Mr. Dietzman is
primarily responsible for planning and directing Midwest Federal Savings'
marketing function as well as establishing marketing objectives and programs
designed to promote the growth of Midwest Federal Savings. In addition, Mr.
Dietzman serves as managing officer of Midwest Financial Products, Inc., Midwest
Federal Savings' sole active subsidiary, which is engaged in the sale of
tax-deferred annuities and other financial products. Prior to joining Midwest
Federal Savings, Mr. Dietzman served as a Vice President, Consumer Loan Manager
and Marketing Director of Hawkeye Bank & Trust for 15 years.

     Michele L. Schnicker, age 37, has been Vice President in charge of data
processing with Midwest Federal Savings since 1989. In this capacity, she is
responsible for the overall administration of operations and data processing of
Midwest Federal Savings. Ms. Schnicker has been employed by Midwest Federal
Savings since 1980.

     EXECUTIVE COMPENSATION. The following table sets forth the cash
compensation paid or accrued by Midwest Federal Savings for services rendered
during the fiscal year ended December 31, 1998 to Midwest Federal Savings' Chief
Executive Officer and Chief Financial Officer. No other officer made in excess
of $100,000 during fiscal 1998. Midwest's officers do not receive any
compensation from Midwest for services performed in their capacities as officers
of Midwest.

<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------
                                  SUMMARY COMPENSATION TABLE
- ----------------------------------------------------------------------------------------------------------
                       ANNUAL COMPENSATION                        LONG TERM COMPENSATION
- ----------------------------------------------------------------------------------------------------------
                                                                          AWARDS
- ----------------------------------------------------------------------------------------------------------
                                                                               SECURITIES
                                                                 RESTRICTED    UNDERLYING       ALL OTHER
       NAME AND                                                     STOCK       OPTIONS/      COMPENSATION
  PRINCIPAL POSITION          YEAR     SALARY($)   BONUS($)(1)    AWARD(S)$      SARS(#)         ($)(2)
- ----------------------------------------------------------------------------------------------------------
<S>                           <C>      <C>         <C>           <C>           <C>            <C>
William D. Hassel             1998      114,278      25,152          --            --            12,229
President, Chief Executive    1997      115,119       6,152          --            --            12,489
Officer and Director          1996      111,930       2,652          --            --            12,773
- ----------------------------------------------------------------------------------------------------------
Robert D. Maschmann           1998       87,278      20,152          --            --            10,445
Executive Vice President,     1997       85,143       3,152          --            --            10,054
Treasurer and Director        1996       81,930       2,652          --            --            10,407
- ----------------------------------------------------------------------------------------------------------
</TABLE>
- ----------

                                      -75-
<PAGE>   90
(1)  Includes a Christmas bonus of $152 paid to all full time employees in 1998,
     1997 and 1996.

(2)  Represents a pre-tax medical insurance premiums off $4,222 and $4,222, and
     ESOP allocations of $8,007 and $6,223 paid on behalf of Mr. Hassel and Mr.
     Maschmann, respectively.

     The following table sets forth information concerning the number and value
of unexercised stock options held by Midwest and Midwest Federal Savings' Chief
Executive Officer and Chief Financial Officer at December 31, 1998. No stock
option awards were made under Midwest's stock option plan during fiscal 1998.
All options granted to date expire ten years from the date of grant and have
exercise prices per share equal to the market price per share of Midwest's
common stock on the date of grant. The stock option plan pursuant to which all
options were granted was ratified by stockholders on April 26, 1993.

<TABLE>
<CAPTION>
===================================================================================================================
                  AGGREGATED OPTION/SAR EXERCISES IN LAST FISCAL YEAR AND FY-END OPTION/SAR VALUES
- -------------------------------------------------------------------------------------------------------------------
                                                         NUMBER OF SECURITIES             VALUE OF UNEXERCISED
                                                        UNDERLYING UNEXERCISED          IN-THE-MONEY OPTIONS/SARS
                                                      OPTIONS/SARS AT FY-END (#)              AT FY-END ($)
- -------------------------------------------------------------------------------------------------------------------
                            SHARES
                           ACQUIRED
                              ON          VALUE
                           EXERCISE     REALIZED
          NAME                (#)          ($)       EXERCISABLE    UNEXERCISABLE     EXERCISABLE    UNEXERCISABLE
- -------------------------------------------------------------------------------------------------------------------
<S>                        <C>          <C>          <C>            <C>               <C>            <C>
William D. Hassel           10,000       129,200       17,300            ---          $158,641(1)        $---(1)
Robert D. Maschmann         16,000       201,845         ---             ---              ---             ---
===================================================================================================================
</TABLE>
- -------------------

(1)  Represents the aggregate market value of incentive stock options to
     purchase 17,300 shares of common stock (market price less the exercise
     price of $3.33 per share), respectively, awarded to Mr. Hassel, based upon
     the average of the bid and asked price of $12.50 per share of the common
     stock on December 31, 1998.

     EMPLOYMENT AGREEMENT. Midwest Federal Savings has entered into an
employment agreement with Messrs. Hassel and Maschmann. The employment agreement
is designed to assist Midwest Federal Savings and Midwest in maintaining a
stable and competent management base. The continued success of Midwest Federal
Savings and Midwest depends to a significant degree on the skills and competence
of their officers. Each employment agreement provides for an annual base salary
in an amount not less than the employee's current salary and an initial term of
three years. The agreements provide for a one-year extension on each anniversary
date, subject to review and approval of the extension by the disinterested
members of the board of directors of Midwest Federal Savings. The agreements
provide for termination upon the employee's death, for cause, or in certain
events specified by the Office of Thrift Supervision regulations. Each
employment agreement provides for payment to the employee of up to 299% of the
employee's then-current annual compensation in the event there is a change in
control of Midwest Federal Savings where employment terminates involuntarily in
connection with such change in control or within twelve months thereafter. This
termination payment is subject to


                                      -76-
<PAGE>   91
reduction by the amount of all other compensation to the employee deemed for
purposes of the Internal Revenue Code to be contingent on a change in control.
Such termination payment is provided on a similar basis in connection with a
voluntary termination of employment, where the change in control was at any time
opposed by Midwest's board of directors. For the purposes of the employment
agreement, a change in control is defined to mean any acquisition or control as
defined in 12.C.F.R. Section 574.4. The agreement provides, among other things,
for participation in an equitable manner in employee benefits applicable to
executive personnel.

     Based on his current salary, if Mr. Hassel or Mr. Maschmann had been
terminated as of December 31, 1998, under circumstances entitling them to
severance pay as described above, they would have been entitled to receive a
lump sum cash payment of approximately $354,000 and 274,000, respectively.

     Mr. Hassel and Mr. Maschmann have agreed to terminate their agreements in
connection with the merger, each in exchange for a cash payments of $120,000 and
$90,000 respectively, upon closing and the execution of new agreements. See "The
Merger Agreement--Interests of Certain Persons in the Merger."

     PENSION PLAN. Midwest Federal Savings participates in a multiple-employer
non-contributory, defined benefit pension plan which covers substantially all
employees and provides for monthly retirement benefits determined on the basis
of the employee's (i) base salary, generally, the amounts shown in the Summary
Compensation Table, above, exclusive of directors' fees and bonuses, averaged
over the five years of highest compensation, and (ii) years of service. Separate
actuarial valuations are not made for individual members of the pension plan.
Pension costs and funding include normal costs and amortization of prior service
costs over ten years. The book value of the assets of the pension plan fund
exceeds its liability for vesting benefits. Midwest Federal Savings had no
pension funding expense for the last six fiscal years, due to the fully funded
status of the pension plan.

     The following table illustrates annual pension benefits payable upon normal
retirement at age 65, based on various levels of compensation and years of
service and assuming payment in the standard form of benefit (single life
annuity) under the terms of the pension plan.

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
                               PENSION PLAN TABLE
- --------------------------------------------------------------------------------
                                     YEARS OF CREDITED SERVICE
- --------------------------------------------------------------------------------
HIGHEST FIVE-YEAR
  AVERAGE ANNUAL
   COMPENSATION       10         15         20         25         30         35
- --------------------------------------------------------------------------------
<S>                 <C>        <C>        <C>        <C>        <C>        <C>
     $ 40,000        8,000     12,000     16,000     20,000     24,000     28,000
- --------------------------------------------------------------------------------
       60,000       12,000     18,000     24,000     30,000     36,000     42,000
- --------------------------------------------------------------------------------
       80,000       16,000     24,000     32,000     40,000     48,000     56,000
- --------------------------------------------------------------------------------
      100,000       20,000     30,000     40,000     50,000     60,000     70,000
- --------------------------------------------------------------------------------
      120,000       24,000     36,000     48,000     60,000     72,000     84,000
- --------------------------------------------------------------------------------
</TABLE>


                                      -77-
<PAGE>   92
     The annual retirement benefits shown in the table reflect a deduction for
Social Security benefits and are not subject to further deductions or offsets.
Mr. Hassel had 25 years of credited service under the pension plan as of
December 31, 1998. Mr. Maschmann had 12 years of credited service under the
pension plan as of December 31, 1998.

         CERTAIN TRANSACTIONS. Midwest Federal Savings has followed a policy of
granting consumer loans and loans secured by the borrower's personal residence
to officers, directors and employees. Loans to officers, directors and their
affiliates have been made in the ordinary course of business and on the same
terms and conditions as those of comparable transactions prevailing at the time,
in accordance with Midwest Federal Savings' underwriting guidelines, and do not
involve more than the normal risk of collectibility or present other unfavorable
features. Loans to officers and directors must be approved by a majority of the
disinterested directors and loans to other employees must be approved by Midwest
Federal Savings' loan committee. All loans by Midwest Federal Savings to its
directors and executive officers are subject to Office of Thrift Supervision
regulations restricting loans and other transactions with affiliated persons of
Midwest Federal Savings. Current law requires that all such loans be made on
terms and conditions comparable to those for similar transactions with
non-affiliates.

RATIFICATION OF THE APPOINTMENT OF AUDITORS

     Midwest's board of directors has renewed Midwest's arrangement for KPMG LLP
to be its auditor for the 1999 fiscal year, subject to the ratification of the
appointment by Midwest's stockholders. A representative of KPMG LLP is expected
to attend the annual meeting to respond to appropriate questions and will have
an opportunity to make a statement if he or she so desires.

     The board of directors recommends that stockholders vote "FOR" the
ratification of the appointment of KPMG LLP as Midwest's auditors for the fiscal
year ending December 31, 1999.

                       SHAREHOLDER/STOCKHOLDER PROPOSALS

     Neither Mahaska nor Midwest is aware of any additional matters which may be
presented at their respective special meetings. As to any proposal that a
shareholder or stockholder of either company intends to present to shareholders
or stockholders without inclusion in this joint proxy statement/prospectus, the
proxies named in the respective management's proxy will be entitled to exercise
their discretionary authority on that proposal.

     Pursuant to Rule 14a-8 under the Exchange Act, Mahaska shareholders may
present proper proposals for inclusion in Mahaska's proxy statement and for
consideration at the next annual meeting of its shareholders by submitting such
proposals to Mahaska in a timely manner. As noted in Mahaska's proxy statement
relating to its 1999 annual meeting of shareholders, in order to be so included
for the 2000 annual meeting of shareholders, shareholder proposals must be
received by Mahaska no later than November 28, 1999, and must otherwise comply
with the


                                      -78-
<PAGE>   93
requirements of Rule 14a-8. As to any proposal that a shareholder intends to
present to shareholders without inclusion in Mahaska's proxy statement for
Mahaska's 2000 annual meeting of shareholders, the proxies named in management's
proxy for that meeting will be entitled to exercise their discretionary
authority on that proposal unless the company receives notice of the matter to
be proposed not later than February 10, 2000. Even if proper notice is received
on or prior to February 10, 2000, the proxies named in management's proxy for
that meeting may nevertheless exercise their discretionary authority with
respect to such matter by advising shareholders of such proposal and how they
intend to exercise their discretion to vote on such matter, unless the
shareholder making the proposal solicits proxies with respect to the proposal to
the extent required by Rule 14a-4(c)(2) under the Exchange Act.

     Pursuant to Rule 14a-8 under the Exchange Act, Midwest stockholders may
present proper proposals for inclusion in Midwest's proxy statement and for
consideration at the next annual meeting of its stockholders by submitting such
proposals to Midwest in a timely manner. In order to be so included for the 1999
annual meeting of stockholders, in the event that the merger has not been
consummated prior thereto, stockholder proposals must have been received by
Midwest no later than __________, 2000, and must otherwise have complied with
the requirements of Rule 14a-8. As to any proposal that a stockholder intends to
present to stockholders without inclusion in Midwest's proxy statement for
Midwest's 2000 annual meeting of stockholders, the proxies named in
management's proxy for that meeting will be entitled to exercise their
discretionary authority on that proposal unless the company receives notice of
the matter to be proposed no later than _________, 2000. Even if proper notice
is received on or prior to _________, 2000, the proxies named in management's
proxy for that meeting may nevertheless exercise their discretionary authority
with respect to such matter by advising stockholders of such proposal and how
they intend to exercise their discretion to vote on such matter, unless the
stockholder making the proposal solicits proxies with respect to the proposal to
the extent required by Rule 14a-4(c)(2) under the Exchange Act.

           CAUTIONARY STATEMENT CONCERNING FORWARD-LOOKING STATEMENTS

     This joint proxy statement/prospectus and the documents incorporated herein
by reference contain forward-looking statements by Mahaska and Midwest. These
forward-looking statements include information regarding the financial
condition, results of operations and business of Mahaska upon consummation of
the merger, including statements relating to: (a) the estimated cost savings and
accretion to reported earnings that will result from the merger; (b) the
estimated impact on revenues; and (c) the restructuring charges expected to be
incurred. In addition, any of the words "believes," "expects," "anticipates" or
similar expressions indicate forward-looking statements. Many possible events or
factors could affect the future financial results and performance of Mahaska
after the merger and could cause such results or performance to differ
materially from those expressed in forward-looking statements. These possible
events or factors include the following:

     -    estimated cost savings from the merger cannot be fully realized within
          the expected time frame;

     -    revenues following the merger are lower than expected;


                                      -79-
<PAGE>   94
          -    competitive pressure among depository institutions increases
               significantly;

          -    costs or difficulties related to the integration of the
               businesses of Mahaska and Midwest are greater than expected;

          -    changes in the interest rate environment reduce interest margins;

          -    general economic conditions, either nationally or in the markets
               in which Mahaska will be doing business, are less favorable than
               expected;

          -    legislation or changes in regulatory requirements adversely
               affect the businesses in which Mahaska would be engaged; and

          -    adverse changes occur in the securities markets.

                      WHERE YOU CAN FIND MORE INFORMATION

     Each of Mahaska and Midwest files annual, quarterly and current reports,
proxy statements and other information with the Commission. You may read and
copy any reports, proxy statements or other information filed by Mahaska and
Midwest at the Commission's public reference rooms in Washington, D.C., New
York, New York and Chicago, Illinois. You can request copies of these documents,
upon payment of a duplicating fee, by writing to the Commission. Please call the
Commission at 1-800-SEC-0330 for further information on the operation of these
public reference rooms. Mahaska's and Midwest's Commission filings are also
available to the public from document retrieval services and at the Commission
internet website at http://www.sec.gov.

     Mahaska has filed with the Commission a registration statement on Form S-4
under the Securities Act and the rules and regulations thereunder. This joint
proxy statement/prospectus is a part of the registration statement. As permitted
by the Securities Act, this joint proxy statement/prospectus does not contain
all of the information you can find in the registration statement. The
registration statement is available for inspection and copying as set forth
above.

     The Commission allows Mahaska and Midwest to "incorporate by reference"
into this joint proxy statement/prospectus, which means that Mahaska and Midwest
can disclose important information to you by referring you to another document
filed separately with the Commission. The information incorporated by reference
is considered to be part of this joint proxy statement/prospectus, except for
any information superseded by information contained in later filed documents
incorporated by reference in this joint proxy statement/prospectus. Each of
Mahaska and Midwest incorporates by reference the respective documents filed by
them with the Commission listed below and any future filings made by it with the
Commission prior to the time of the Special Meetings under Sections 13(a),
13(c), 14 or 15(d) of the Exchange Act.


                                      -80-
<PAGE>   95
<TABLE>
<CAPTION>
MAHASKA SEC FILINGS (FILE NO. 0-24630)                      PERIOD/DATE
<S>                                                 <C>
Annual Report on Form 10-K                          Year ended December 31, 1998

Quarterly Reports on Form 10-Q                      Quarter ended March 31, 1999

Current Report on Form 8-K                          Filed on February 12, 1999

Form 8-A                                            August 3, 1994
</TABLE>

<TABLE>
<CAPTION>
MIDWEST SEC FILINGS (FILE NO. 0-20620)                      PERIOD/DATE
<S>                                                 <C>

Annual Report on Form 10-KSB                        Year ended December 31, 1998

Quarterly Report on Form 10-QSB                     Quarter ended March 31, 1999

Current Report on Form 8-K                          Filed on February 18, 1999

Form 8-A                                            September 10, 1992
</TABLE>

     Accompanying this joint proxy statement/prospectus are Mahaska's 1998
Annual Report to Shareholders and Quarterly Report on Form 10-Q for the quarter
ended March 31, 1999 and Midwest's 1998 Form 10-KSB and Quarterly Report on Form
10-QSB for the quarter ended March 31, 1999.

     You should rely only on the information contained or incorporated by
reference in this joint proxy statement/prospectus. Neither Mahaska nor Midwest
has authorized anyone else to provide you with information that is different
from that which is contained in this joint proxy statement/prospectus. Moreover,
neither Mahaska nor Midwest is making an offer to sell or soliciting an offer to
buy any securities other than the Mahaska common stock to be issued by Mahaska
in the merger, and neither Mahaska nor Midwest is making an offer of such
securities in any state where the offer is not permitted. The information
contained in this joint proxy statement/prospectus speaks only as of its date
unless the information specifically indicates that another date applies.


                                      -81-
<PAGE>   96
                          INDEX TO FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
                                                                            PAGE
<S>                                                                         <C>
MAHASKA INVESTMENT COMPANY

Consolidated Statements of Condition--as of March 31, 1999 and
  December 31, 1998 ......................................................   F-2
Consolidated Statements of Income--for the three months ended
  March 31, 1999 and 1998 ................................................   F-3
Consolidated Statements of Comprehensive Income--for the three
  months ended March 31, 1999 and 1998 ...................................   F-4
Consolidated Statements of Cash Flows--for the three months
  ended March 31, 1999 and 1998 ..........................................   F-5
Notes to Consolidated Financial Statements ...............................   F-7
Independent Auditors' Report .............................................   F-8
Consolidated Balance Sheets--as of December 31, 1998 and 1997 ............   F-9
Consolidated Statements of Income--for the years ended December 31,
  1998, 1997 and 1996 ....................................................   F-10
Consolidated Statements of Changes in Shareholders' Equity and
  Comprehensive Income--for the years ended December 31, 1998, 1997 and
  1996 ...................................................................   F-11
Consolidated Statements of Cash Flows--for the years ended
  December 31, 1998, 1997 and 1996 .......................................   F-12
Note to Consolidated Financial Statements ................................   F-13

MIDWEST BANCSHARES, INC

Consolidated Balance Sheets--as of March 31, 1999 and
   December 31, 1998 .....................................................   F-29
Consolidated Statements of Operations--for the three months
   ended March 31, 1999 and 1998 .........................................   F-30
Consolidated Statements of Comprehensive Income--for the three
   months ended March 31, 1999 and 1998 ..................................   F-32
Consolidated Statements of Cash Flows--for the three months ended
   March 31, 1999 and 1998 ...............................................   F-33
Notes to Consolidated Financial Statements................................   F-35
Independent Auditors' Report .............................................   F-37
Consolidated Balance Sheets--as of December 31, 1998 and 1997 ............   F-38
Consolidated Statements of Operations--for the years ended
  December 31, 1998, 1997 and 1996 .......................................   F-39
Consolidated Statements of Stockholders' Equity
  and Comprehensive Income--for the years ended December 31,
  1998, 1997 and 1996 ....................................................   F-40
Consolidated Statements of Cash Flows--for the years ended
  December 31, 1998, 1997 and 1996 .......................................   F-41
Notes to Consolidated Financial Statements ...............................   F-43
</TABLE>


                                      F-1
<PAGE>   97

                           MAHASKA INVESTMENT COMPANY
                                AND SUBSIDIARIES
                      CONSOLIDATED STATEMENTS OF CONDITION

<TABLE>
<CAPTION>
(unaudited)
(dollars in thousands)                                 March 31,      December 31,
                                                          1999           1998
<S>                                                    <C>                <C>
               ASSETS
Cash and due from banks                                $   7,510          9,292
Interest-bearing deposits in banks                         1,892          3,559
Federal funds sold                                         8,734          9,270
   Cash and cash equivalents                           $  18,136         22,121

Investment securities:
   Available for sale                                     30,456         29,655
   Held to maturity                                       14,851         13,679
Loans                                                    172,198        165,427
Allowance for loan losses                                 (2,037)        (2,177)
   Net loans                                           $ 170,161        163,250

Loan pool participations                                  50,536         54,510
Premises and equipment, net                                3,995          4,043
Accrued interest receivable                                3,095          3,175
Other assets                                               2,624          2,406
Goodwill                                                   5,401          5,550
      Total assets                                     $ 299,255        298,389

   LIABILITIES AND SHAREHOLDERS' EQUITY
Deposits:
   Demand                                              $  19,409         23,029
   NOW and Super NOW                                      33,133         34,214
   Savings                                                66,126         59,758
   Certificates of deposit                               114,861        115,732
      Total deposits                                   $ 233,529        232,733

Federal funds purchased                                        0              0
Federal Home Loan Bank advances                            7,588          7,595
Note payable                                              16,200         17,000
Other liabilities                                          3,194          2,829
      Total liabilities                                $ 260,511        260,157

Shareholders' equity:
   Common stock, $5 par value;
         authorized 4,000,000 shares;
         issued 3,807,501 shares                       $  19,038         19,038
   Capital surplus                                            17             17
   Treasury stock at cost, 171,156
         shares as of March 31, 1999,
         and December 31, 1998                            (2,799)        (2,799)
   Retained earnings                                      22,418         21,806
   Accumulated other comprehensive income                     70            170
      Total shareholders' equity                       $  38,744         38,232

      Total liabilities and shareholders'
                  equity                               $ 299,255        298,389
</TABLE>

See accompanying notes to consolidated financial statements.


                                      F-2
<PAGE>   98

                           MAHASKA INVESTMENT COMPANY
                                AND SUBSIDIARIES
                        CONSOLIDATED STATEMENTS OF INCOME

<TABLE>
<CAPTION>
(unaudited)                                                   Three Months Ended
(dollars in thousands,                                             March 31,
except per share)                                              1999        1998
                                                               ----        ----
<S>                                                          <C>           <C>
Interest income:
   Interest and fees on loans                                $3,774        3,400
   Interest and discount on loan pools                        2,209        2,464
   Interest on bank deposits                                     36           41
   Interest on federal funds sold                                97          107
   Interest on investment securities:
      Available for sale                                        446          372
      Held to maturity                                          187          250
         Total interest income                               $6,749        6,634

Interest expense:
   Interest on deposits:
      NOW and Super NOW                                      $  147          165
      Savings                                                   562          544
      Certificates of deposit                                 1,579        1,460
   Interest on federal funds purchased                            0            0
   Interest on Federal Home Loan Bank advances                  108           89
   Interest on note payable                                     305          254
         Total interest expense                               2,701        2,512
             Net interest income                              4,048        4,122
             Provision for loan losses                          167          110
             Net interest income after
                   provision for loan losses                 $3,881        4,012

Noninterest income:
   Service charges                                           $  304          288
   Data processing income                                        50           48
   Other operating income                                       138           79
   Investment security gains                                      0           26
         Total noninterest income                               492          441

Noninterest expense:
   Salaries and employee benefits expense                    $1,337        1,157
   Net occupancy expense                                        357          324
   FDIC assessment                                               12           12
   Professional fees                                             86           86
   Other operating expense                                      614          475
   Goodwill amortization                                        149          153
         Total noninterest expense                            2,555        2,207
             Income before income tax expense                $1,818        2,246
Income tax expense                                              661          816
         Net income                                          $1,157        1,430

Earnings per common share - basic                            $ 0.32         0.39
Earnings per common share - diluted                          $ 0.31         0.37
Dividends per common share                                   $ 0.15         0.14
</TABLE>

See accompanying notes to consolidated financial statements.


                                      F-3
<PAGE>   99

                           MAHASKA INVESTMENT COMPANY
                                AND SUBSIDIARIES
                 CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

<TABLE>
<CAPTION>
                                                                   Three Months
(unaudited)                                                           Ended
(in thousands)                                                       March 31,
                                                                  1999      1998
                                                                ----------------
<S>                                                             <C>        <C>
Net income                                                      $ 1,157    1,430
Other Comprehensive Income:
   Unrealized gains (losses)on
           securities available for sale:
           Unrealized holding gains (losses)
                  arising during the period, net
                  of taxes on income of ($59) in
                  1999 and $12 in 1998                             (100)      20
        Less: reclassification adjustment
                  for gains included in net income,
                  net of taxes on income                              0        0

Other comprehensive income, net of tax                             (100)      20
Comprehensive income                                            $ 1,057    1,450
</TABLE>

See accompanying notes to consolidated financial statements.


                                      F-4
<PAGE>   100

                           MAHASKA INVESTMENT COMPANY
                                AND SUBSIDIARIES
                      CONSOLIDATED STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
(unaudited)                                                   Three Months Ended
(dollars in thousands)                                             March 31,
                                                               1999        1998
                                                             -------------------
<S>                                                          <C>           <C>
Cash flows from operating activities:
         Net income                                          $  1,157      1,430
         Adjustments to reconcile net income
           to net cash provided by operating
           activities:
                  Depreciation and amortization                   314        303
                  Provision for loan losses                       167        110
                  Investment securities gains                       0        (26)
                  Amortization of investment
                    securities premiums                            46         38
                  Accretion of investment securities
                    and loan discounts                           (120)      (104)
                  (Increase) decrease in other assets            (138)       138
                  Increase in other liabilities                   424        366
                           Total adjustments                      693        825
                           Net cash provided by operating
                             activities                      $  1,850      2,255

Cash flows from investing activities:

         Investment securities available for sale:
                  Proceeds from sales                               0        175
                  Proceeds from maturities                      3,383        185
                  Purchases                                    (4,373)       (32)
         Investment securities held to maturity:
                  Proceeds from maturities                        644      2,701
                  Purchases                                    (1,826)    (1,220)
         Purchases of loan pool participations                 (1,628)         0
         Principal recovery on loan pool
           participations                                       5,602      6,206
         Net increase in loans                                 (6,964)    (2,620)
         Purchases of bank premises and equipment                (117)      (201)
                  Net cash (used in) provided by
                    investing activities                     $ (5,279)     5,194

Cash flows from financing activities:
         Net increase in deposits                            $    796      3,221
         Advances on note payable                                 150          0
         Principal payments on note payable                      (950)    (3,500)
         Repayment of Federal Home Loan
           Bank advances                                           (7)         0
         Dividends paid                                          (545)      (515)
</TABLE>


                                      F-5
<PAGE>   101
<TABLE>
<S>                                                          <C>           <C>
         Proceeds from exercise of stock options                    0        106
                           Net cash used in financing
                             activities                      $   (556)      (688)

                           Net (decrease) increase in cash
                           and cash equivalents              $ (3,985)     6,761

Cash and cash equivalents at beginning of period             $ 22,121     19,195
Cash and cash equivalents at end of period                   $ 18,136     25,956

Supplemental disclosures of cash flow information:
         Cash paid during the period for:
                  Interest                                   $  2,732      2,533
                  Income taxes                               $    229        114
</TABLE>

See accompanying notes to consolidated financial statements.


                                      F-6
<PAGE>   102

                           MAHASKA INVESTMENT COMPANY

                   Notes to Consolidated Financial Statements
                                   (Unaudited)

1.   Basis of Presentation

The accompanying consolidated financial statements include the accounts and
transactions of the Company and its four wholly-owned subsidiaries, Mahaska
State Bank, Central Valley Bank, Pella State Bank and On-Site Credit Services,
Inc. All material intercompany balances and transactions have been eliminated in
consolidation.

The accompanying consolidated financial statements have been prepared by the
Company pursuant to the rules and regulations of the Securities and Exchange
Commission. Certain information and footnote disclosures normally included in
financial statements prepared in accordance with generally accepted accounting
principles have been condensed or omitted pursuant to such rules and
regulations. Although management believes that the disclosures are adequate to
make the information presented not misleading, it is suggested that these
interim consolidated financial statements be read in conjunction with the
Company's most recent audited financial statements and notes thereto. In the
opinion of management, the accompanying consolidated financial statements
contain all adjustments (consisting of only normal recurring accruals) necessary
to present fairly the financial position as of March 31, 1999, and the results
of operations for the three months ended March 31, 1999 and 1998, and changes in
cash flows for the three months ended March 31, 1999 and 1998.

The results for the three months ended March 31, 1999 may not be indicative of
results for the year ended December 31, 1999, or for any other quarter.

2.   Statements of Cash Flows

In the statements of cash flows, cash and cash equivalents include cash and due
from banks, interest-bearing deposits with banks, and federal funds sold.

3.   Income Taxes

Federal income tax expense for the three months ended March 31, 1999 and 1998
was computed using the consolidated effective federal tax rate. The Company also
recognized income tax expense pertaining to state franchise taxes payable
individually by the subsidiary banks.

4.   Earnings Per Common Share

Basic earnings per common share computations are based on the weighted average
number of shares of common stock actually outstanding during the period. The
weighted average number of shares for the three-month periods ended March 31,
1999 and 1998 was 3,636,345 and 3,673,186, respectively. Diluted earnings per
share amounts are computed by dividing net income by the weighted average number
of shares and all dilutive potential shares outstanding during the period. The


                                      F-7
<PAGE>   103
computation of diluted earnings per share used a weighted average number of
shares outstanding of 3,757,646 and 3,883,623 for the three months ended March
31, 1999 and 1998, respectively.

5.   Effect of New Financial Accounting Standards

The Company adopted the provisions of SFAS 131, "Disclosure about Segments of an
Enterprise and Related Information" effective January 1, 1998. SFAS No. 131
establishes disclosure requirements for segment operations. The adoption had no
effect on the Company's financial statement disclosures because the Company
operates as a single business segment.

6.   Use of Estimates in the Preparation of Financial Statements

The preparation of financial statements in conformity with generally accepted
accounting principles requires management to make estimates and assumptions that
affect the reported amounts of assets and liabilities and disclosure of
contingent assets and liabilities at the date of the financial statements and
the reported amounts of revenues and expenses during the reported period. Actual
results could differ from those estimates. A significant estimate that is
particularly sensitive to change relates to the allowance for losses.


                                      F-8
<PAGE>   104

40/41   INDEPENDENT AUDITORS' REPORT

THE BOARD OF DIRECTORS
MAHASKA INVESTMENT COMPANY:

We have audited the accompanying consolidated balance sheets of Mahaska
Investment Company and subsidiaries as of December 31, 1998 and 1997, and the
related consolidated statements of income, changes in shareholders' equity and
comprehensive income, and cash flows for each of the years in the three-year
period ended December 31, 1998. These consolidated financial statements are the
responsibility of the Company's management. Our responsibility is to express an
opinion on the consolidated financial statements based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the consolidated financial statements referred to above present
fairly, in all material respects, the financial position of Mahaska Investment
Company and subsidiaries as of December 31, 1998 and 1997, and the results of
their operations and their cash flows for each of the years in the three-year
period ended December 31, 1998, in conformity with generally accepted accounting
principles.

KPMG LLP

February 12, 1999
Des Moines, Iowa



                                       F-8




<PAGE>   105

20/21  CONSOLIDATED FINANCIAL STATEMENTS

CONSOLIDATED BALANCE SHEETS

<TABLE>
<CAPTION>
DECEMBER 31 (In thousands)                                                    1998        1997
- -----------------------------------------------------------------------------------------------
<S>                                                                        <C>           <C>
ASSETS:
Cash and due from banks ...................................................$  9,292      10,854
Interest-bearing deposits in banks ........................................   3,559       1,526
Federal funds sold ........................................................   9,270       6,815
                                                                           --------------------
  Cash and cash equivalents ...............................................  22,121      19,195
                                                                           --------------------
Investment securities (notes 2 and 8):
  Available for sale ......................................................  29,655      23,228
  Held to maturity (fair value of $13,838 in 1998
    and $19,869 in 1997) ..................................................  13,679      19,833
Loans, net of unearned discount (notes 3, 5, and 8) ....................... 165,427     144,333
  Allowance for loan losses (note 4) ......................................  (2,177)     (1,816)
                                                                           --------------------
    Net loans ............................................................. 163,250     142,517
                                                                           --------------------
Loan pool participations ..................................................  54,510      54,326
Premises and equipment, net (note 6) ......................................   4,043       4,183
Accrued interest receivable ...............................................   3,175       2,927
Other assets ..............................................................   7,956       8,664
                                                                           --------------------
    Total assets ..........................................................$298,389     274,873
                                                                           ====================

LIABILITIES AND SHAREHOLDERS' EQUITY:
Deposits (notes 2 and 7):
  Demand ..................................................................$ 23,029      21,277
  NOW and Super NOW .......................................................  34,214      33,226
  Savings .................................................................  59,758      59,020
  Certificates of deposit ................................................. 115,732     101,785
                                                                           --------------------
    Total deposits ........................................................ 232,733     215,308
Federal Home Loan Bank advances (note 8) ..................................   7,595       6,000
Notes payable (note 9) ....................................................  17,000      14,050
Other liabilities .........................................................   2,829       2,761
                                                                           --------------------
    Total liabilities ..................................................... 260,157     238,119
                                                                           --------------------
Shareholders' equity:
  Common stock, $5 par value; authorized 20,000,000 shares; issued and
    outstanding 3,636,345 as of December 31, 1998, and 3,665,494 shares
    as of December 31, 1997 ...............................................  19,038      19,038
  Capital surplus .........................................................      17         118
  Treasury stock at cost, 171,156 and 142,007 shares as of
    December 31, 1998 and 1997, respectively ..............................  (2,799)     (1,752)
  Retained earnings (note 15) .............................................  21,806      19,231
  Accumulated other comprehensive income ..................................     170         119
                                                                           --------------------
    Total shareholders' equity ............................................  38,232      36,754
                                                                           --------------------
  Commitments and contingencies (note 16) .................................      --          --
                                                                           --------------------
    Total liabilities and shareholders' equity ............................$298,389     274,873
                                                                           ====================
</TABLE>

See accompanying notes to consolidated financial statements.



                                        F-9
<PAGE>   106





                                               [LOGO] MAHASKA INVESTMENT COMPANY

                                               CONSOLIDATED STATEMENTS OF INCOME

<TABLE>
<CAPTION>
YEAR ENDED DECEMBER 31 (In thousands, except per share amounts)               1998        1997       1996
- ----------------------------------------------------------------------------------------------------------
<S>                                                                        <C>           <C>        <C>
INTEREST INCOME:
Interest and fees on loans ............................................... $ 15,026      12,293     10,203
Interest income and discount on loan pool participations .................    7,970       8,474      9,097
Interest on bank deposits ................................................      122         108        266
Interest on federal funds sold ...........................................      338         128         92
Interest on investment securities:
  Available for sale .....................................................    1,617       1,705      1,348
  Held to maturity .......................................................      893       1,249      1,623
                                                                           -------------------------------
    Total interest income ................................................   25,966      23,957     22,629
                                                                           -------------------------------
INTEREST EXPENSE:
Interest on deposits (note 7):
  NOW and Super NOW ......................................................      656         677        612
  Savings ................................................................    2,241       2,259      2,058
  Certificates of deposit ................................................    6,102       5,442      4,845
Interest on federal funds purchased ......................................       12          32         48
Interest on Federal Home Loan Bank advances ..............................      405         138         --
Interest on notes payable ................................................    1,074         764        968
                                                                           -------------------------------
  Total interest expense .................................................   10,490       9,312      8,531
                                                                           -------------------------------
  Net interest income ....................................................   15,476      14,645     14,098
Provision for loan losses (note 4) .......................................    1,179         417        987
                                                                           -------------------------------
    Net interest income after provision for loan losses ..................   14,297      14,228     13,111
                                                                           -------------------------------

OTHER INCOME:
Service charges ..........................................................    1,215       1,130        922
Data processing income ...................................................      195         209        221
Other operating income ...................................................      389         408        437
Investment securities gains (losses), net (note 2) .......................       58          (8)       (74)
                                                                           -------------------------------
    Total other income ...................................................    1,857       1,739      1,506
                                                                           -------------------------------

OTHER EXPENSE:
Salaries and employee benefits expense (note 13) .........................    4,796       4,343      3,774
Net occupancy expense ....................................................    1,349       1,173      1,011
Federal Deposit Insurance Corporation assessment .........................       47          42        282
Professional fees ........................................................      394         407        459
Other operating expense ..................................................    1,750       1,717      1,683
Goodwill amortization ....................................................      612         633        529
                                                                           -------------------------------
    Total other expense ..................................................    8,948       8,315      7,738
                                                                           -------------------------------
    Income before income tax expense .....................................    7,206       7,652      6,879
Income tax expense (note 11) .............................................    2,583       2,594      2,385
                                                                           -------------------------------
    Net income ........................................................... $  4,623       5,058      4,494
                                                                           -------------------------------
Net income per share - basic ............................................. $   1.26        1.38       1.20
                                                                           -------------------------------
Net income per share - diluted ........................................... $   1.20        1.33       1.19
                                                                           -------------------------------
</TABLE>


See accompanying notes to consolidated financial statements.

                                        F-10
<PAGE>   107


22/23   CONSOLIDATED FINANCIAL STATEMENTS

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS'
EQUITY AND COMPREHENSIVE INCOME

<TABLE>
<CAPTION>
                                                                                                    ACCUMULATED
                                                                                                          OTHER
                                                COMMON       CAPITAL      TREASURY      RETAINED  COMPREHENSIVE
(in thousands except share data)                STOCK        SURPLUS         STOCK      EARNINGS         INCOME           TOTAL
- --------------------------------------------------------------------------------------------------------------------------------
<S>                                            <C>           <C>          <C>           <C>       <C>                     <C>
Balance at December 31, 1995 ............      $11,423        7,787          (231)       13,070            57             32,106
                                               ---------------------------------------------------------------------------------

Comprehensive income:
  Net income ............................           --           --            --         4,494            --              4,494
  Unrealized losses arising during the
    year on securities available
    for sale ............................          --           --            --            --          (143)              (143)
  Plus realized losses on securities
    available for securities, net
    of tax ..............................           --           --            --            --            46                 46
                                               ---------------------------------------------------------------------------------
  Total comprehensive income ............           --           --            --         4,494           (97)             4,397
                                               ---------------------------------------------------------------------------------
Dividends paid (.44 per share) ..........           --           --            --        (1,638)           --             (1,638)
Treasury stock purchased
  (66,667 shares) .......................           --           --          (622)           --            --               (622)
                                               ---------------------------------------------------------------------------------

Balance at December 31, 1996 ............       11,423        7,787          (853)       15,926           (40)            34,243
                                               =================================================================================

Comprehensive income:
  Net income ............................           --           --            --         5,058            --              5,058
  Unrealized gains arising during the
    year on securities available
    for sale ............................          --           --            --            --           154                154
  Plus realized losses on securities
    available for sale, net of tax ......           --           --            --            --             5                  5
                                               ---------------------------------------------------------------------------------
  Total comprehensive income ............           --           --            --         5,058           159              5,017
                                               ---------------------------------------------------------------------------------
Dividends paid (.48 per share) ..........           --           --            --        (1,753)           --             (1,753)
Stock split effected in the form of a
  dividend (five-for-three) .............        7,615       (7,615)           --            --            --                 --
Stock options exercised
  (65,970 shares) .......................           --          (54)          783            --            --                729
Treasury stock purchased
  (116,310 shares) ......................           --           --        (1,682)           --            --             (1,682)
                                               ---------------------------------------------------------------------------------

Balance at December 31, 1997 ............       19,038          118        (1,752)       19,231           119             36,754
                                               =================================================================================

Comprehensive income:
  Net income ............................           --           --            --         4,623            --              4,623
  Unrealized gains arising during the
    year on securities available
    for sale ............................          --           --            --            --            88                 88
  Less realized gains on securities
    available for securities, net
    of tax ..............................           --           --            --            --           (37)               (37)
                                               ---------------------------------------------------------------------------------
  Total comprehensive income ............           --           --            --         4,623            51              4,674
                                               ---------------------------------------------------------------------------------
Dividends paid (.56 per share) ..........           --           --            --        (2,048)           --             (2,048)
Stock options exercised
  (58,219 shares) .......................           --         (101)          790            --            --                689
Treasury stock purchased
  (87,368 shares) .......................           --           --        (1,837)           --            --             (1,837)
                                               ---------------------------------------------------------------------------------

Balance at December 31, 1998 ............      $19,038           17        (2,799)       21,806           170             38,232
                                               =================================================================================
</TABLE>

See accompanying notes to consolidated financial statements.

                                        F-11
<PAGE>   108



                                               [LOGO] MAHASKA INVESTMENT COMPANY

                                           CONSOLIDATED STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
YEAR ENDED DECEMBER 31 (in thousands)                                                 1998                  1997           1996
- --------------------------------------------------------------------------------------------------------------------------------
CASH FLOWS FROM OPERATING ACTIVITIES:
<S>                                                                                <C>                      <C>            <C>
Net income ......................................................................  $  4,623                 5,058          4,494
                                                                                   ---------------------------------------------
Adjustments to reconcile net income to net cash provided by operating activities:
  Depreciation and amortization .................................................     1,247                 1,129            930
  Provision for loan losses .....................................................     1,179                   417            987
  Investment securities (gains) losses, net .....................................       (58)                    8             74
  Loss on sale of bank premises and equipment ...................................        --                    14              7
  Amortization of premiums on investment securities .............................       155                   225            301
  Accretion of investment securities and loan discounts .........................      (447)                 (578)          (353)
  (Increase) decrease in other assets ...........................................      (152)                 (759)           256
  Increase in other liabilities .................................................        42                   503            441
                                                                                   ---------------------------------------------
    Total adjustments ...........................................................     1,966                   959          2,643
                                                                                   ---------------------------------------------
    Net cash provided by operating activities ...................................     6,589                 6,017          7,137
                                                                                   ---------------------------------------------
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment securities available for sale:
  Proceeds from sales ...........................................................     3,205                 1,994          6,022
  Proceeds from maturities ......................................................     5,810                10,807          3,285
  Purchases .....................................................................   (15,347)               (9,330)       (24,310)
Investment securities held to maturity:
  Proceeds from maturities ......................................................    10,390                 9,639          8,611
  Purchases .....................................................................    (4,333)               (1,936)        (5,698)
Purchases of loan pool participations ...........................................   (25,710)              (25,589)       (29,827)
Principal recovery on loan pool participations ..................................    25,526                21,950         24,458
Net increase in loans ...........................................................   (21,483)              (26,450)       (17,227)
Purchase of bank premises and equipment .........................................      (495)               (1,615)          (650)
Proceeds from sale of bank premises and equipment ...............................        --                    24             12
Proceeds from branch acquisition, net ...........................................        --                    --         14,246
                                                                                   ---------------------------------------------
    Net cash used in investing activities .......................................   (22,437)              (20,506)       (21,078)
                                                                                   ---------------------------------------------
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in deposits ........................................................    17,425                 8,356         13,364
Federal Home Loan Bank advances .................................................     8,000                11,600             --
Repayment of Federal Home Loan Bank advances ....................................    (6,405)               (5,600)            --
Advances on notes payable .......................................................     7,450                 6,550          6,400
Principal payments on notes payable .............................................    (4,500)               (1,000)        (7,900)
Dividends paid ..................................................................    (2,048)               (1,753)        (1,638)
Purchases of treasury stock .....................................................    (1,837)               (1,682)          (622)
Proceeds from exercise of stock options .........................................       689                   729             --
                                                                                   ---------------------------------------------
    Net cash provided by financing activities ...................................    18,774                17,200          9,604
                                                                                   ---------------------------------------------
    Net increase (decrease) in cash and cash equivalents ........................     2,926                 2,711         (4,337)
Cash and cash equivalents at beginning of year ..................................    19,195                16,484         20,821
                                                                                   ---------------------------------------------
Cash and cash equivalents at end of year ........................................  $ 22,121                19,195         16,484
                                                                                   =============================================

SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid during the year for:
  Interest ......................................................................  $ 10,382                 9,299          8,299
                                                                                   =============================================
  Income taxes ..................................................................  $  2,128                 2,894          2,239
                                                                                   =============================================
</TABLE>

See accompanying notes to consolidated financial statements.



                                   F-12
<PAGE>   109

24/25   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

DECEMBER 31, 1998, 1997, AND 1996

1 | SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
The accounting and reporting policies of Mahaska Investment Company and
subsidiaries (the "Company") conform to generally accepted accounting principles
and to general practices within the banking industry. The consolidated financial
statements of the Company include the accounts of its 100 percent owned
subsidiaries, Mahaska State Bank, Central Valley Bank, Pella State Bank, and
On-Site Credit Services. All material intercompany transactions have been
eliminated in consolidation.

FORMATION OF PELLA STATE BANK

Pella State Bank is a full service, state-chartered, commercial bank which was
formed as a de novo institution by the Company in December 1997. The Company
provided initial capitalization of $5,000,000 to Pella State Bank from cash on
hand and an advance on its commercial bank line of credit.

BANK OFFICE ACQUISITION

On June 21, 1996, Central Valley Bank acquired the Sigourney, Iowa, bank office
of Boatmen's Bank Iowa, N.A. and assumed approximately $32.1 million in deposits
and purchased certain loans totaling approximately $14.6 million. Central Valley
Bank's existing branch facility in Sigourney was consolidated into the newly
acquired facility. A premium of approximately $3.0 million was paid by Central
Valley Bank to acquire the deposits. The acquisition was accounted for as a
purchase transaction and, as such, did not require any restatement of prior
period financial statements.

NATURE OF OPERATIONS

The bank subsidiaries engage in retail and commercial banking and related
financial services, providing the usual products and services such as deposits,
commercial, real estate, and consumer loans, and trust services. Mahaska State
Bank also provides data processing services to affiliated and non-affiliated
banks. On-Site Credit Services provides equipment leasing and accounts
receivable financing.

Since 1988, the Company, either directly or through the bank subsidiaries, has
invested in loan pool participations that have been purchased by certain
non-affiliated independent service corporations (collectively, the "Servicer")
from the Federal Deposit Insurance Corporation ("FDIC"), the Resolution Trust
Corporation ("RTC"), or other sources. These loan pool investments are comprised
of packages of loans previously made by financial institutions, which often
include distressed or nonperforming loans, that have been sold at prices
reflecting varying discounts from the aggregate outstanding principal amount of
the underlying loans depending on the credit quality of the portfolio. The
Servicer collects and remits these amounts, less servicing fees, to the
participants.

EFFECT OF NEW FINANCIAL ACCOUNTING STANDARDS

The Company adopted the provisions of SFAS No. 130, Reporting Comprehensive
Income, effective January 1, 1998. SFAS No. 130 establishes the standards for
the reporting and display of comprehensive income in the financial statements.
Comprehensive income represents net income and certain amounts reported directly
in shareholders' equity, such as the net unrealized gain or loss on
available-for-sale securities. The statement requires additional disclosures in
the consolidated financial statements; it does not affect the Company's
financial position or results of operations. Prior year consolidated financial
statements have been reclassified to conform to the requirements of SFAS No.
130.

The Company adopted the provisions of SFAS No. 131, Disclosure about Segments of
an Enterprise and Related Information, effective January 1, 1998. SFAS No. 131
establishes disclosure requirements for segment operations. The adoption had no
effect on the Company's financial statement disclosures because the Company
operates as a single business segment.

SFAS No. 133, Accounting for Derivative Instruments and Hedging Activities, will
be effective for the Company for the year beginning January 1, 2000. Management
is evaluating the impact the adoption of SFAS No. 133 will have on the Company's
consolidated financial statements. The Company expects to adopt SFAS No. 133
when required.


                                        F-13


<PAGE>   110

                                               [LOGO] MAHASKA INVESTMENT COMPANY

EARNINGS PER SHARE

Basic earnings per share amounts are computed by dividing net income by the
weighted average number of shares outstanding during the year. Diluted earnings
per share amounts are computed by dividing net income by the weighted average
number of shares and all dilutive potential shares outstanding during the year.
In November 1997, the Company issued a five-for-three stock split in the form of
a dividend. All prior year share amounts have been restated to reflect this
stock dividend. The Company has had a Stock Repurchase Plan in effect since
April 1995. In accordance with this plan, 87,368, 116,310 and 66,667 shares of
common stock were repurchased by the Company during 1998, 1997, and 1996,
respectively. The following information was used in the computation of earnings
per share on both a basic and diluted basis for the years ended December 31,
1998, 1997 and 1996:

<TABLE>
<CAPTION>
(In thousands)                                                                  1998      1997     1996
- --------------------------------------------------------------------------------------------------------
<S>                                                                            <C>        <C>      <C>
BASIC EPS COMPUTATION
Numerator:
  Net Income ...............................................................   $4,623     5,058    4,494
                                                                               -------------------------
Denominator:
  Average Shares Outstanding ...............................................    3,660     3,653    3,744
                                                                               -------------------------
Basic EPS ..................................................................   $ 1.26      1.38     1.20
                                                                               -------------------------

DILUTED EPS COMPUTATION
Numerator:
  Net Income ...............................................................   $4,623     5,058    4,494
                                                                               -------------------------
Denominator:
  Average Shares Outstanding ...............................................    3,660     3,653    3,744
  Stock Options ............................................................      182       137       28
                                                                               -------------------------
                                                                                3,842     3,790    3,772
                                                                               -------------------------
Diluted EPS ................................................................   $ 1.20      1.33     1.19
                                                                               =========================
</TABLE>

FAIR VALUE OF FINANCIAL INSTRUMENTS

Fair value estimates are made at a specific point in time, based on relevant
market information about the financial instrument. These estimates do not
reflect any premium or discount that could result from offering the Company's
entire holdings of a particular financial instrument for sale at one time.
Unless included in assets available for sale, it is the Company's general
practice and intent to hold its financial instruments to maturity and not to
engage in trading or sale activities.

Fair value estimates are based on judgments regarding future expected loss
experience, current economic conditions, risk characteristics of various
financial instruments and other factors. These estimates are subjective in
nature and involve uncertainties and matters of significant judgment and
therefore cannot be determined with precision. Changes in assumptions could
significantly affect the estimates.

Estimated fair values have been determined by the Company using the best
available data and an estimation method suitable for each category of financial
instruments.

CASH AND DUE FROM BANKS

The Company is required to maintain certain daily reserve balances on hand in
accordance with federal banking regulations. The average reserve balances
maintained in accordance with such regulations for the years ended December 31,
1998, 1997, and 1996 were $1,048,000, $897,000 and $835,000, respectively.

                                   F-14







<PAGE>   111

26/27 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


INVESTMENT SECURITIES

The Company classifies its investment securities based on the intended holding
period. Securities which may be sold prior to maturity to meet liquidity needs,
to respond to market changes, or to adjust the Company's asset-liability
position are classified as available for sale. Securities held principally for
the purpose of near-term sales are classified as trading. Securities which the
Company intends to hold until maturity are classified as held to maturity.

Investment securities available for sale are recorded at fair value. The
aggregate unrealized gains or losses, net of the income tax effect, are recorded
as a component of other comprehensive income until realized. Securities held to
maturity are recorded at cost, adjusted for amortization of premiums and
accretion of discounts.

Net gains or losses on the sales of securities are shown in the consolidated
statements of income using the specific identification method.

LOANS

Loans are stated at the principal amount outstanding, net of unearned discount
and allowance for loan losses. Unearned discount on installment loans is
transferred to income over the term of the loan using the level-yield method.
Interest on all other loans is credited to income as earned based on the
principal amount outstanding.

It is the Company's policy to discontinue the accrual of interest income on any
loan when, in the opinion of management, there is reasonable doubt as to the
timely collectibility of interest or principal. Nonaccrual loans are returned to
an accrual status when, in the opinion of management, the financial position of
the borrower indicates there is no longer any reasonable doubt as to timely
payment of principal or interest.

CONCENTRATIONS OF CREDIT RISK

The Company originates real estate, consumer, and commercial loans primarily in
its southeast Iowa market area and adjacent counties. Although the Company has a
diversified loan portfolio, a substantial portion of its borrowers' ability to
repay their loans is dependent upon economic conditions in the Company's market
area.

ALLOWANCE FOR LOAN LOSSES

The allowance for loan losses is established through a provision for loan losses
charged to expense. Loans are charged against the allowance for loan losses when
management believes collectibility of the principal is unlikely.

Management believes the allowance for loan losses is adequate to absorb losses
in the loan portfolio. While management uses available information to recognize
loan losses, future additions to the allowance may be necessary based on changes
in economic conditions. In addition, various regulatory agencies, as an integral
part of the examination process, periodically review the subsidiary banks'
allowance for loan losses. Such agencies may require the subsidiary banks to
increase their allowance for loan losses based on their judgments and
interpretations about information available to them at the time of their
examinations.

LOAN POOL PARTICIPATIONS

The Company has invested in participations in pools of loans acquired from the
FDIC, the RTC, and other sources at substantial discounts. The pools, all
acquired since 1988, consist of loans to borrowers located throughout the United
States.

The Company carries its investment in the loan pools as a separate earning asset
on its balance sheet. Principal or interest restructures, write-downs, or
write-offs within the pools are not included in the Company's disclosures for
its loan portfolio.

The loan pools are managed by the Servicer operating in Omaha, Nebraska, the
sole incentive of which is cash collection without regard to principal or income
allocation of the payment. The investment in loan pools is accounted for on a
nonaccrual basis. For loans receiving regular payments, cash is applied first to
interest income for interest due at the contract rate. Additional payment is
then applied to principal in a ratio of cost basis to loan face amount and to
discount income for the remainder.

For loans where payments are received on an irregular basis, the Servicer
evaluates the collateral position of the loan and, where well-secured, the
payments are applied as described above. When the loan is judged to be other
than


                                   F-15




<PAGE>   112
                                               [LOGO] MAHASKA INVESTMENT COMPANY

well-secured, the payment is applied to principal and discount income with no
recognition of interest due at the contract rate.

For loans where the circumstances or new information lead the Servicer to
believe that collection of the note or recovery through collateral is less than
originally determined, the cost basis assigned to the loan is written down or
off through a charge to discount income.

For loans where the Servicer negotiates a settlement of the obligation for a
lump sum, the payment is applied first to principal, then to discount income and
last to interest due at the contract rate.

PREMISES AND EQUIPMENT

Premises and equipment are stated at cost less accumulated depreciation.
Depreciation is computed using the straight-line or accelerated method over the
estimated useful lives of respective assets, which range from 5 to 40 years for
building and improvements and 3 to 10 years for furniture and equipment.

EXCESS OF COST OVER UNDERLYING NET ASSETS

The excess of cost over underlying net assets of $5,550,000, $6,162,000 and
$6,795,000 at December 31, 1998, 1997, and 1996, respectively, is being
amortized primarily using the straight-line method over 15 years. Amortization
expenses for 1998, 1997, and 1996 were $612,000, $633,000 and $529,000,
respectively.

OTHER REAL ESTATE OWNED

Other real estate owned represents property acquired through foreclosure or
deeded to the subsidiary banks in lieu of foreclosure on real estate mortgage
loans on which the borrowers have defaulted as to payment of principal and
interest. Other real estate owned is carried at the lower of the cost of
acquisition or the asset's fair market value, less estimated costs of
disposition, and is included in other assets on the consolidated balance sheets.
Reductions in the balance of other real estate at the date of acquisition are
charged to the allowance for loan losses. Expenses incurred subsequent to the
acquisition of the property and any subsequent write-downs to reflect current
fair market value are charged as noninterest expense as incurred. Gains or
losses on the disposition of other real estate are recognized in other income or
expense in the period in which they are realized.

Other real estate owned of $12,000 at December 31, 1998 and 1997 was included in
other assets.

TRUST DEPARTMENT ASSETS

Property held for customers in fiduciary or agency capacities is not included in
the accompanying consolidated balance sheets, as such items are not assets of
the Company.

INCOME TAXES

The Company files a consolidated federal income tax return. Federal income taxes
are allocated based on each entity computing its taxes on a separate company
basis. For state purposes, the bank subsidiaries each file a franchise return
and the remaining entities file a consolidated income tax return.

STATEMENTS OF CASH FLOWS

For purposes of reporting cash flows, cash and cash equivalents include cash and
due from banks, interest-bearing deposits in banks, and federal funds sold.

RECLASSIFICATIONS

Certain reclassifications have been made to prior years' consolidated financial
statements in order to conform to current year presentation.

USE OF ESTIMATES IN THE PREPARATION OF FINANCIAL STATEMENTS

The preparation of financial statements in conformity with generally accepted
accounting principles requires management to make estimates and assumptions that
affect the reported amounts of assets and liabilities and disclosure of
contingent assets and liabilities at the date of the financial statements and
the reported amounts of revenues and expenses during the reporting period.
Actual results could differ from those estimates. A significant estimate that is
particularly sensitive to change relates to the allowance for loan losses.


                                   F-16



<PAGE>   113

28/29 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

2 | INVESTMENT SECURITIES
A summary of investment securities by type as of December 31, 1998 and 1997,
follows:

<TABLE>
<CAPTION>
                                                                 GROSS        GROSS     APPROX.
                                                 AMORTIZED  UNREALIZED   UNREALIZED        FAIR
DECEMBER 31, 1998 (In thousands)                      COST       GAINS       LOSSES       VALUE
- -----------------------------------------------------------------------------------------------
<S>                                               <C>               <C>                   <C>
INVESTMENT SECURITIES AVAILABLE FOR SALE:
U.S. government securities ...................... $  4,501         102           --       4,603
U.S. government agency securities ...............   18,257         164           13      16,408
Other investment securities .....................    8,627          29           12       8,644
                                                  ---------------------------------------------
  Total ......................................... $ 29,385         295           25      29,655

INVESTMENT SECURITIES HELD TO MATURITY:
U.S. government agency securities ............... $  1,290          26           --       1,316
Obligations of states and political subdivisions.    8,291         127            9       8,409
Other investment securities ....................     4,098          15           --       4,113
                                                  ---------------------------------------------
  Total ........................................  $ 12,679         168            9      13,838

<CAPTION>
                                                                 GROSS        GROSS     APPROX.
                                                 AMORTIZED  UNREALIZED   UNREALIZED        FAIR
DECEMBER 31, 1997 (In thousands)                      COST       GAINS       LOSSES       VALUE
- -----------------------------------------------------------------------------------------------
<S>                                               <C>               <C>                   <C>
INVESTMENT SECURITIES AVAILABLE FOR SALE:
U.S. government securities .....................  $  4,506          57           --       4,563
U.S. government agency securities ..............    15,177         143            7      15,313
Other investment securities ....................     3,352           5            5       3,352
                                                  ---------------------------------------------
  Total ........................................  $ 23,035         205           12      23,228
                                                  =============================================
INVESTMENT SECURITIES HELD TO MATURITY:
U.S. government securities .....................  $  5,046          --           12       5,034
U.S. government agency securities ..............     2,885          34            5       2,914
Obligations of states and political
 subdivisions ..................................     6,793          52           18       6,827
Other investment securities ....................     5,109          --           15       5,094
                                                  ---------------------------------------------
  Total ........................................  $ 19,833          86           50      19,869
                                                  =============================================
</TABLE>

Proceeds from the sale of investment securities available for sale during 1998,
1997, and 1996 were $3,205,000, $1,994,000, and $6,022,000, respectively. Gross
gains and losses realized on the sale of investment securities available for
sale for each of the following years ended December 31 were as follows:


<TABLE>
<CAPTION>
(In thousands)                                                          1998     1997      1996
- -----------------------------------------------------------------------------------------------
<S>                                                                   <C>        <C>       <C>
Realized gains ...................................................... $   58       --         6
Realized losses .....................................................     --       (8)      (80)
                                                                      -------------------------
  Total ............................................................. $   58       (8)      (74)
                                                                      =========================
</TABLE>

As of December 31, 1998 and 1997, investment securities of approximately
$9,557,000 and $16,103,000, respectively, were pledged as collateral to secure
public fund deposits and for other purposes required or permitted by law. Public
funds approximated $27,181,000 and $25,781,000 at December 31, 1998 and 1997,
respectively.

The amortized cost and approximate fair value of investment securities as of
December 31, 1998, by contractual maturity, are shown as follows. Expected
maturities will differ from contractual maturities because issuers may have the
right to call or prepay obligations with or without call or prepayment
penalties.



                                        F-17
<PAGE>   114


                                               [LOGO] MAHASKA INVESTMENT COMPANY


<TABLE>
<CAPTION>
                                                                          AMORTIZED  APPROXIMATE
(In thousands)                                                                 COST   FAIR VALUE
- ------------------------------------------------------------------------------------------------
<S>                                                                        <C>       <C>
INVESTMENT SECURITIES AVAILABLE FOR SALE:
Due in 1 year or less .................................................... $  4,005        4,011
Due after 1 year through 5 years .........................................   17,734       17,869
Due after 5 years through 10 years .......................................    2,043        2,078
Due after 10 years .......................................................    5,603        5,697
                                                                           ---------------------
  Total .................................................................. $ 29,385       29,655
                                                                           ---------------------

INVESTMENT SECURITIES HELD TO MATURITY:
Due in 1 year or less .................................................... $  4,496        4,514
Due after 1 year through 5 years .........................................    6,598        6,691
Due after 5 years through 10 years .......................................    1,467        1,506
Due after 10 years .......................................................    1,118        1,127
                                                                           ---------------------
  Total .................................................................. $ 13,679       13,838
                                                                           =====================
</TABLE>

3 | LOANS
A summary of the respective loan categories as of December 31, 1998 and 1997,
follows:

<TABLE>
<CAPTION>
(In thousands)                                                                 1998         1997
- ------------------------------------------------------------------------------------------------
<S>                                                                        <C>            <C>
Real estate loans ........................................................ $ 82,587       72,303
Commercial and agricultural loans ........................................   66,463       55,977
Loans to individuals .....................................................   12,847       13,268
Other loans ..............................................................    3,530        2,785
                                                                           ---------------------
Total .................................................................... $165,427      144,333
                                                                           =====================
</TABLE>

Total nonperforming loans and assets at December 31, 1998 and 1997, were:

<TABLE>
<CAPTION>
(In thousands)                                                                 1998         1997
- ------------------------------------------------------------------------------------------------
<S>                                                                        <C>               <C>
Impaired loans and leases:
  Nonaccrual ............................................................. $    561          927
  Restructured ...........................................................      164          387
                                                                           ---------------------
     Total impaired loans and leases .....................................      725        1,314
Loans and leases past due 90 days or more ................................      663          522
                                                                           ---------------------
Total nonperforming loans ................................................    1,388        1,836
Other real estate owned ..................................................       12           12
                                                                           ---------------------
Total nonperforming assets ............................................... $  1,400        1,848
                                                                           =====================
</TABLE>

The average balances of nonperforming loans for the years ended December 31,
1998 and 1997, were $1,626,000 and $1,669,000, respectively. The allowance for
credit losses related to nonperforming loans at December 31, 1998 and 1997, was
$103,000 and $368,000, respectively. Nonperforming loans of $1,343,000 and
$902,000 at December 31, 1998 and 1997, respectively, were not subject to a
related allowance for credit losses because of the net realizable value of loan
collateral, guarantees and other factors. The effect of nonaccrual and
restructured loans on interest income for each of the three years ended December
31, 1998, 1997, and 1996 was:

<TABLE>
<CAPTION>
(In thousands)                                                          1998     1997      1996
- -----------------------------------------------------------------------------------------------
<S>                                                                   <C>        <C>       <C>
INTEREST INCOME:
  As originally contracted .......................................... $  126      213       131
  As recognized .....................................................     17       91        41
                                                                      -------------------------
     Reduction of interest income ................................... $  109      122        90
                                                                      =========================
</TABLE>




                                        F-18
<PAGE>   115
30/31 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

4 | ALLOWANCE FOR LOAN LOSSES

Changes in the allowance for loan losses for the years ended December 31, 1998,
1997, and 1996 were as follows:

<TABLE>
<CAPTION>
(In thousands)                                                          1998     1997      1996
- -----------------------------------------------------------------------------------------------
<S>                                                                   <C>       <C>       <C>
Balance at beginning of year .......................................  $1,816    1,491     1,001
Provision for loan losses ..........................................   1,179      417       987
Recoveries on loans previously charged off .........................      22       45        38
Loans charged off ..................................................    (840)    (137)     (705)
Acquisition allowance ..............................................      --       --       170
                                                                      -------------------------
Balance at end of year .............................................  $2,177    1,816     1,491
                                                                      =========================
</TABLE>

5 | LOANS TO RELATED PARTIES

Certain directors and officers of the Company, including their immediate
families and companies in which they are principal owners, were loan customers
of the Company's subsidiaries. All loans to this group were made in the ordinary
course of business at prevailing terms and conditions. The loan activity of this
group included in loans as of December 31, 1998 and 1997, was as follows:

<TABLE>
<CAPTION>
(In thousands)                                                                 1998        1997
- -----------------------------------------------------------------------------------------------
<S>                                                                         <C>           <C>
Aggregate balance at beginning of year .................................... $ 7,633       6,421
Advances ..................................................................  12,829      10,334
Payments ..................................................................  12,442       9,122
                                                                            -------------------
Aggregate balance at end of year .......................................... $ 8,020       7,633
                                                                            ===================
</TABLE>

6 | PREMISES AND EQUIPMENT
A summary of premises and equipment as of December 31, 1998 and 1997 was as
follows:

<TABLE>
<CAPTION>
(In thousands)                                                                 1998        1997
- -----------------------------------------------------------------------------------------------
<S>                                                                         <C>             <C>
Land and improvements ....................................................  $   603         603
Building and improvements ................................................    3,670       3,571
Furniture and equipment ..................................................    4,962       4,614
                                                                            -------------------
  Total office properties and equipment at cost ..........................    9,235       8,788
Less accumulated depreciation ............................................    5,192       4,605
                                                                            -------------------
  Total ..................................................................  $ 4,043       4,183
                                                                            ===================
</TABLE>

7 | DEPOSITS
The scheduled maturities of certificate accounts are as follows as of December
31, 1998:

<TABLE>
<CAPTION>
(In thousands)
- --------------------------------------------------------------------------------
<C>                                                                    <C>
1999 ................................................................. $  78,558
2000 .................................................................    23,420
2001 .................................................................     9,087
2002 .................................................................     3,062
2003 .................................................................     1,605
Thereafter ...........................................................        --
                                                                       ---------
  Total .............................................................. $ 115,732
                                                                       =========
</TABLE>

Time deposits in excess of $100,000 approximated $24,468,000 and $19,755,000 as
of December 31, 1998 and 1997, respectively. Interest expense on such deposits
for the years ended December 31, 1998, 1997, and 1996 was approximately
$1,189,000, $871,000, and $663,000, respectively.


                                        F-19

<PAGE>   116

                                               [LOGO] MAHASKA INVESTMENT COMPANY


8 | FEDERAL HOME LOAN BANK ADVANCES
At December 31, 1998 and 1997, Federal Home Loan Bank (FHLB) advances consisted
of the following:

<TABLE>
<CAPTION>
                                                              WEIGHTED-                 WEIGHTED-
                                                                AVERAGE                   AVERAGE
(in thousands)                                      1998  INTEREST RATE      1997   INTEREST RATE
- -------------------------------------------------------------------------------------------------
<S>                                             <C>                <C>      <C>              <C>
Maturity in year ending
1998 .......................................... $     --             --%    1,000            5.82%
1999 ..........................................    3,027           5.96     3,000            5.96
2000 ..........................................    2,029           6.01     2,000            6.02
2001 ..........................................       30           5.40        --             --
Over 3 Years ..................................    2,509           5.07        --             --
                                                -------------------------------------------------
  Total ....................................... $  7,595                    6,000
                                                =================================================
</TABLE>

Advances from the FHLB are secured by stock in the FHLB. In addition, Mahaska
State Bank has pledged certain U.S. Agency securities, and Central Valley Bank
and Pella State Bank have agreed to maintain unencumbered additional security in
the form of certain residential mortgage loans aggregating not less than 125
percent and 150 percent of outstanding advances, respectively.

9 | NOTES PAYABLE
The notes payable balance at December 31, 1998, consists of advances on a
$20,000,000 line of credit. The line has a variable interest rate and is due
June 30, 1999. The current notes are secured by all of the common stock of the
subsidiaries. Interest is payable quarterly at 3/8 below the lender's prime
rate, which ranged from 7 3/8 percent to 8 1/2 percent in 1998.




                                        F-20
<PAGE>   117


32/33   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


10 | FAIR VALUE OF FINANCIAL INSTRUMENTS

The fair value of the Company's financial instruments as of December 31, 1998
and 1997, were as follows:

<TABLE>
<CAPTION>
                                                                           CARRYING        FAIR
1998 (In thousands)                                                           VALUE       VALUE
- -----------------------------------------------------------------------------------------------
<S>                                                                        <C>            <C>
FINANCIAL ASSETS:
Cash and due from banks .................................................. $  9,292       9,292
Interest-bearing deposits with banks .....................................    3,559       3,559
Federal funds sold .......................................................    9,270       9,270
Investment securities ....................................................   43,334      43,493
Loans, net ...............................................................  163,250     163,809
Loan pool participations .................................................   54,510      54,510

FINANCIAL LIABILITIES:
Deposits ................................................................. $232,733     233,444
Federal Home Loan Bank advances ..........................................    7,595       7,609
Notes payable ............................................................   17,000      17,000

OFF BALANCE SHEET ITEMS:
Commitments to extend credit ............................................. $     --          --
Letters of credit ........................................................       --          --

<CAPTION>

                                                                           CARRYING        FAIR
1997 (In thousands)                                                           VALUE       VALUE
- -----------------------------------------------------------------------------------------------
<S>                                                                        <C>            <C>
FINANCIAL ASSETS:
Cash and due from banks .................................................. $ 10,854      10,854
Interest-bearing deposits with banks .....................................    1,526       1,526
Federal funds sold .......................................................    6,815       6,815
Investment securities ....................................................   43,061      43,097
Loans, net ...............................................................  142,517     143,405
Loan pool participations .................................................   54,326      54,326

FINANCIAL LIABILITIES:
Deposits ................................................................. $215,308     216,494
Federal Home Loan Bank advances ..........................................    6,000       6,000
Notes payable ............................................................   14,050      14,050

OFF BALANCE SHEET ITEMS:
Commitments to extend credit ............................................. $     --          --
Letters of credit ........................................................       --          --
</TABLE>

The recorded amount of cash and due from banks, interest-bearing deposits with
banks, and federal funds sold approximates fair value.

The estimated fair value of investment securities has been determined using
available quoted market prices.

The estimated fair value of loans is net of an adjustment for credit risk. For
loans with floating interest rates, it is presumed that estimated fair values
generally approximate the recorded book balances. Fixed rate loans were valued
using a present value discounted cash flow with a discount rate approximating
the market rate for similar assets.

The recorded amount of the loan pools participations approximates fair value due
to the characteristics of the loan pool participations. Any additional value
attained in the loan pool participations over purchase cost is directly
attributable to the expertise of the Servicer to collect a higher percentage of
the book value of loans in the pools over the percentage paid.


                                        F-21

<PAGE>   118

                                               [LOGO] MAHASKA INVESTMENT COMPANY

Deposit liabilities with no stated maturities have an estimated fair value equal
to the recorded balance. Deposits with stated maturities have been valued using
a present value discounted cash flow with a discount rate approximating the
current market for similar deposits. The fair value estimate does not include
the benefit that results from the low-cost funding provided by the deposit
liabilities compared to the cost of borrowing funds in the market. The Company
believes the value of these depositor relationships to be significant.

The estimated fair value of the Federal Home Loan Bank advances was determined
using a present-value discounted cash flow with a discount rate approximating
the current market for similar borrowings.

The recorded amount of the notes payable approximates fair value as a result of
the short-term nature of these instruments.

The fair value of commitments to extend credit and standby letters of credit are
estimated using the fees currently charged to enter into similar agreements.

11 | INCOME TAXES
Income tax expense (benefit) for the years ended December 31, 1998, 1997, and
1996 is as follows:

<TABLE>
<CAPTION>
1998 (In thousands)                                                  FEDERAL    STATE     TOTAL
- -----------------------------------------------------------------------------------------------
<S>                                                                   <C>         <C>     <C>
Current ...........................................................   $2,297      370     2,667
Deferred ..........................................................      (57)     (27)      (84)
                                                                      -------------------------
                                                                      $2,240      343     2,583
                                                                      =========================

<CAPTION>

1997 (In thousands)                                                  FEDERAL    STATE     TOTAL
- -----------------------------------------------------------------------------------------------

<S>                                                                   <C>         <C>     <C>
Current ...........................................................   $2,389      350     2,739
Deferred ..........................................................     (133)     (12)     (145)
                                                                      -------------------------
                                                                      $2,256      338     2,594
                                                                      =========================

<CAPTION>

1996 (In thousands)                                                  FEDERAL    STATE     TOTAL
- -----------------------------------------------------------------------------------------------
<S>                                                                   <C>         <C>     <C>
Current ...........................................................   $2,198      276     2,474
Deferred ..........................................................      (89)      --       (89)
                                                                      -------------------------
                                                                      $2,109      276     2,385
                                                                      =========================
</TABLE>

Income tax expense differs from the amount computed by applying the United
States federal income tax rate of 34 percent in 1998, 1997, and 1996 to income
before income tax expense. The reasons for these differences are as follows:

<TABLE>
<CAPTION>
(In thousands)                                                          1998     1997      1996
- -----------------------------------------------------------------------------------------------
<S>                                                                   <C>       <C>       <C>
Provision at statutory rate ......................................... $2,450    2,602     2,239
State franchise tax (net of federal tax benefit) ....................    227      223       182
Nontaxable interest income ..........................................   (113)    (115)    (144)
Nondeductible goodwill amortization .................................     21       21        21
Life insurance cash value increase ..................................    (26)     (26)     (31)
Other, net ..........................................................     24     (111)       18
                                                                      -------------------------
  Total ............................................................. $2,583    2,594     2,385
                                                                      =========================
</TABLE>



                                          F-22
<PAGE>   119
34/35 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



The tax effects of temporary differences that give rise to significant portions
of the deferred tax assets and liabilities at December 31, 1998 and 1997, are as
follows:

<TABLE>
<CAPTION>
(In thousands)                                                                 1998        1997
- -----------------------------------------------------------------------------------------------
<S>                                                                         <C>             <C>
DEFERRED TAX ASSETS:
Allowance for loan losses ................................................. $   569         438
Deferred compensation .....................................................      72          79
Premium amortization ......................................................      73          58
                                                                            -------------------
  Gross deferred tax assets ...............................................     714         575
                                                                            -------------------

DEFERRED TAX LIABILITIES:
Depreciation and amortization .............................................    (105)        (94)
Federal Home Loan Bank stock ..............................................     (11)        (17)
Deferred loan fees ........................................................     (87)        (70)
Unrealized gain on available for sale securities ..........................    (100)        (74)
Other .....................................................................     (49)        (15)
                                                                            -------------------
  Gross deferred tax liabilities ..........................................    (352)       (270)
                                                                            -------------------
  Net deferred tax asset .................................................. $   362         305
                                                                            -------------------
</TABLE>

No valuation allowance was required for the deferred tax asset at December 31,
1998 or 1997.

12 | STOCK INCENTIVE PLAN

The Company has a stock incentive plan under which up to 750,000 shares of
common stock are reserved for issuance pursuant to options or other awards which
may be granted to officers, key employees, and certain non-affiliated directors
of the Company. The exercise price of each option equals the market price of the
Company's stock on the date of grant. The option's maximum term is ten years,
with vesting occurring at the rate of thirty-three percent on the one-year
anniversary of date of grant, sixty-six percent vesting on the two-year
anniversary, and one hundred percent vesting on the three-year anniversary of
date of grant. The Company applies APB Opinion No. 25 and related
interpretations in accounting for its plan. Accordingly, no compensation cost
has been recognized for its stock options in the financial statements. Had
compensation cost for the Company's stock incentive plan been determined
consistent with SFAS No. 123, the Company's net income and net income per share
would have been reduced to the pro forma amounts indicated below:

<TABLE>
<CAPTION>
(In thousands)                                                                 1998        1997
- -----------------------------------------------------------------------------------------------
<S>                                                                         <C>           <C>
NET INCOME:
As reported ..............................................................  $ 4,623       5,058
Pro forma ................................................................    4,362       4,770
NET INCOME PER SHARE:
As reported - basic ......................................................  $  1.26        1.38
As reported - diluted ....................................................     1.20        1.33
Pro forma - basic ........................................................     1.19        1.31
Pro forma - diluted ......................................................     1.18        1.28
</TABLE>

The fair value of each option grant has been estimated using the Black-Scholes
option-pricing model with the following weighted-average assumptions used for
grants in 1998 and 1997, respectively: dividend yield of 2.80 percent for 1998
and 2.80 percent for 1997; expected volatility of 24 percent for 1998 and 25
percent for 1997; risk free interest rates of 4.71 percent for 1998 and 5.74
percent for 1997; and expected lives of 7.5 years for both years.


                                   F-23

<PAGE>   120








                                               [LOGO] MAHASKA INVESTMENT COMPANY


A summary of the status of the Company's stock incentive plan as of December 31,
1998 and 1997, and the activity during the years ended on those dates is
presented below:

<TABLE>
<CAPTION>
                                                                                               1998                       1997
                                                                         --------------------------   ------------------------
                                                                                           EXERCISE                   EXERCISE
                                                                            SHARES            PRICE    SHARES            PRICE
- ------------------------------------------------------------------------------------------------------------------------------
<S>                                                                      <C>         <C>              <C>       <C>
Balance at beginning of year ............................................  519,769   $  7.50-19.875   440,827   $  7.50-11.10
Granted .................................................................   43,041    16.875-22.00    151,819     11.10-19.875
Exercised ...............................................................   58,219      7.50-13.95     65,970      7.50-9.00
Forfeited ...............................................................    7,292     11.10-22.00      6,907      9.00-11.10
                                                                           -------                    -------
Outstanding at end of year ..............................................  497,299   $  7.50-22.00    519,769   $  7.50-19.875
Options exercisable at year-end .........................................  363,494   $  7.50-19.875   308,671   $  7.50-19.875
Weighted-average fair value of options granted during the year                       $  4.65                    $  4.65
</TABLE>

13 | EMPLOYEE BENEFIT PLANS

The Company maintains an employee stock ownership plan ("ESOP") covering
substantially all employees meeting minimum age and service requirements.
Contributions are determined by the board of directors of each subsidiary.
Contributions relating to the plan were $161,000, $142,000 and $114,000 for
1998, 1997, and 1996, respectively. As of December 31, 1998 and 1997, the ESOP
owned 417,667 and 421,025 shares of the Company's Common Stock, respectively.

A 401(k) plan was adopted by the Company in 1994. The Company does not make any
contributions to this plan. The Company has also provided deferred compensation
plans to certain executive officers, which provide for a series of payments to
be made after retirement. The present value of the future payments is being
accrued over the respective employees' remaining active service periods. The
total expense related to these plans was ($19,000), $39,000 and $33,000 for the
years ended December 31, 1998, 1997, and 1996, respectively.

The Company provides no material post-retirement benefits.


                                   F-24






<PAGE>   121

36/37 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



14 | REGULATORY CAPITAL REQUIREMENTS

The Company is subject to various capital requirements administered by the
federal banking agencies. Failure to meet minimum capital requirements can
initiate certain mandatory--and possible additional discretionary--actions by
regulators that, if undertaken, could have a direct material effect on the
Company's financial statements. Under capital adequacy guidelines and the
regulatory framework for prompt corrective action, the Company must meet
specific capital guidelines that involve quantitative measures of the Company's
assets, liabilities and certain off-balance sheet items as calculated under
regulatory accounting practices. The Company's capital amounts and
classifications are also subject to qualitative judgments by the regulators
about components, risk weightings, and other factors. Quantitative measures
established by regulation to ensure capital adequacy require the Company to
maintain minimum amounts and ratios (set forth in the following table) of total
capital and Tier 1 capital to risk-weighted assets and of Tier 1 capital to
average assets. Management believes, as of December 31, 1998, that the Company
meets all capital adequacy requirements to which it is subject.The Company and
significant subsidiaries actual capital amounts and ratios are also presented in
the following table.

<TABLE>
<CAPTION>
                                                                                                             TO BE WELL CAPITALIZED
                                                                                       MINIMUM FOR CAPITAL   UNDER PROMPT CORRECTIVE
                                                                       ACTUAL          ADEQUACY PURPOSES      ACTION PROVISIONS
- ------------------------------------------------------------------------------------------------------------------------------------
(in thousands)                                                 AMOUNT        RATIO       AMOUNT      RATIO     AMOUNT    RATIO
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                           <C>             <C>      <C>            <C>     <C>         <C>
AS OF DECEMBER 31, 1998:
TOTAL CAPITAL (TO RISK-WEIGHTED ASSETS):
Consolidated .................................................$34,858         14.9%    $18,656        8.0%        N/A      N/A
Mahaska State Bank ........................................... 15,638         11.2      11,162        8.0     $13,953     10.0%
Central Valley Bank ..........................................  8,364         14.0       4,763        8.0       5,954     10.0
Pella State Bank .............................................  4,924         44.3         890        8.0       1,113     10.0
TIER 1 CAPITAL (TO RISK-WEIGHTED ASSETS):
Consolidated .................................................$32,682         14.0%    $ 9,328        4.0%        N/A      N/A
Mahaska State Bank ........................................... 14,518         10.4       5,581        4.0     $ 8,372      6.0%
Central Valley Bank ..........................................  7,966         13.4       2,382        4.0       3,572      6.0
Pella State Bank .............................................  4,765         42.8         445        4.0         668      6.0
TIER 1 CAPITAL (TO AVERAGE ASSETS):
Consolidated .................................................$32,682         11.3%    $ 8,682        3.0%        N/A      N/A
Mahaska State Bank ........................................... 14,518          8.6       5,041        3.0     $ 8,402      5.0%
Central Valley Bank ..........................................  7,966          9.3       2,569        3.0       4,282      5.0
Pella State Bank .............................................  4,765         33.8         423        3.0         705      5.0

AS OF DECEMBER 31, 1997:
TOTAL CAPITAL (TO RISK-WEIGHTED ASSETS):
Consolidated .................................................$32,408         15.6%    $16,602        8.0%        N/A      N/A
Mahaska State Bank ........................................... 16,084         12.2      10,541        8.0     $13,176     10.0%
Central Valley Bank ..........................................  7,055         12.7       4,428        8.0       5,536     10.0
Pella State Bank .............................................  4,940        207.1         191        8.0         239     10.0
TIER 1 CAPITAL (TO RISK-WEIGHTED ASSETS):
Consolidated .................................................$30,592         14.7%    $ 8,301        4.0%        N/A      N/A
Mahaska State Bank ........................................... 15,022         11.4       5,270        4.0     $ 7,905      6.0%
Central Valley Bank ..........................................  6,756         12.2       2,214        4.0       3,321      6.0
Pella State Bank .............................................  4,926        206.5          95        4.0         14       6.0
TIER 1 CAPITAL (TO AVERAGE ASSETS):
Consolidated .................................................$30,592         11.8%    $ 7,773        3.0%        N/A      N/A
Mahaska State Bank ........................................... 15,022          9.1       4,946        3.0     $ 8,244      5.0%
Central Valley Bank ..........................................  6,756          8.9       2,278        3.0       3,796      5.0
Pella State Bank .............................................  4,926        378.5          39        3.0          65      5.0
</TABLE>


                                   F-25
<PAGE>   122






                                              [LOGO] MAHASKA INVESTMENT COMPANY



15 | DIVIDEND RESTRICTIONS

The Company derives a substantial portion of its cash flow, including that
available for dividend payments to shareholders, from its bank subsidiaries in
the form of dividends received. The bank subsidiaries are subject to certain
statutory and regulatory restrictions that affect dividend payments. Based on
minimum regulating guidelines as published by those regulators, the maximum
dividends which could be paid by the bank subsidiaries to the Company at
December 31, 1998, approximated $12,271,000.

16 | COMMITMENTS AND CONTINGENCIES

The Company is a party to financial instruments with off balance sheet risk in
the normal course of business to meet the financing needs of its customers,
which include commitments to extend credit. The Company's exposure to credit
loss in the event of nonperformance by the other party to the commitments to
extend credit is represented by the contractual amount of those instruments. The
Company uses the same credit policies in making commitments as it does for
on-balance sheet instruments.

Commitments to extend credit are agreements to lend to a customer as long as
there is no violation of any conditions established in the contract. Commitments
generally have fixed expiration dates or other termination clauses and may
require payment of a fee. Since many of the commitments are expected to expire
without being drawn upon, the total commitment amounts do not necessarily
represent future cash requirements. The Company evaluates each customer's
creditworthiness on a case-by-case basis. As of December 31, 1998 and 1997,
outstanding commitments to extend credit totaled approximately $18,755,000 and
$15,597,000, respectively.

Commitments under standby letters of credit outstanding aggregated $3,018,000
and $2,297,000 as of December 31, 1998 and 1997, respectively. The Company does
not anticipate any losses as a result of these transactions.

The Company is involved in various legal actions and proceedings arising from
the normal course of operations. Management believes, based on known facts and
the advice of legal counsel, that the ultimate liability, if any, not covered by
insurance, arising from all legal actions and proceedings will not have a
material adverse effect upon the
consolidated financial position of the Company.

17 | SUBSEQUENT EVENT

On February 2, 1999, the Company announced execution of a definitive merger
agreement with Midwest Bancshares, Inc. of Burlington, Iowa ("Midwest"). The
merger will be accomplished through a tax-free fixed exchange of one (1) share
of Company common stock for each share of outstanding common stock of Midwest
Bancshares, Inc. The transaction is intended to qualify as a tax-free
reorganization and be accounted for as a pooling of interests. The transaction
is expected to be completed in the third quarter of 1999, after customary
regulatory and shareholder approvals have been received. Based on the Company's
closing price of $17.00 on February 2, 1999, the transaction will be valued at
$19.0 million. Based on Midwest's total shares outstanding of approximately 1.1
million shares as of February 2, 1999, the Company will have approximately 4.7
million shares outstanding after the merger. This merger will add approximately
$163,000,000 in assets and $106,000,000 in deposits to the Company.



                                   F-26


<PAGE>   123




38/39 NOTES CONSOLIDATED FINANCIAL STATEMENTS



18 | MAHASKA INVESTMENT COMPANY (PARENT COMPANY ONLY)

BALANCE SHEETS

<TABLE>
<CAPTION>
DECEMBER 31 (In thousands)                                                     1998        1997
- -----------------------------------------------------------------------------------------------
<S>                                                                        <C>              <C>
ASSETS:
Cash on deposit at bank subsidiary ....................................... $    309         617
Cash at other institutions ...............................................       22          19
                                                                           --------------------
  Cash and cash equivalents ..............................................      331         636
Investment securities ....................................................      377         299
Loans ....................................................................    7,511       2,447
Loan pool participations .................................................    7,607       7,734
Investments in:
  Bank subsidiaries ......................................................   32,678      32,782
  Bank-related subsidiary ................................................    5,274       5,059
Excess cost over net assets ..............................................       21          83
Premises and equipment ...................................................      685         733
Other assets .............................................................      923       1,182
                                                                           --------------------
  Total assets ...........................................................   55,407      50,955
                                                                           --------------------

LIABILITIES AND SHAREHOLDERS' EQUITY:
Notes payable ............................................................ $ 17,000      14,050
Accrued expenses payable and other liabilities ...........................      175         151
                                                                           --------------------
  Total liabilities ......................................................   17,175      14,201
                                                                           ====================
Shareholders' equity:
Common stock .............................................................   19,038      19,038
Capital surplus ..........................................................       17       7,734
Treasury stock at cost ...................................................   (2,799)     (1,752)
Retained earnings ........................................................   21,806      11,615
Accumulated other comprehensive income ...................................      170         119
                                                                           --------------------
  Total shareholders' equity .............................................   38,232      36,754
                                                                           --------------------
  Total liabilities and shareholders' equity ............................. $ 55,407      50,955
                                                                           ====================
</TABLE>



                                        F-27


<PAGE>   124

                                               [LOGO] MAHASKA INVESTMENT COMPANY

<TABLE>
<CAPTION>
STATEMENTS OF INCOME
YEAR ENDED DECEMBER 31 (In thousands)                                                         1998         1997          1996
- -----------------------------------------------------------------------------------------------------------------------------
<S>                                                                                        <C>            <C>           <C>
INCOME:
Dividends from subsidiaries .........................................................      $ 4,600        2,400         2,000
Interest income and discount on loan pool participations ............................        1,878        2,713         3,498
Management, audit, and loan review fees .............................................          236          398           285
Other operating income ..............................................................          433          146           247
                                                                                           ----------------------------------
  Total income ......................................................................        7,147        5,657         6,030
                                                                                           ==================================
EXPENSE:
Salaries and benefits expense .......................................................          859        1,026           925
Interest on short-term borrowings ...................................................        1,074          800           968
Other operating expense .............................................................          638          646           642
                                                                                           ----------------------------------
  Total expense .....................................................................        2,571        2,472         2,535
                                                                                           ==================================
Income before income tax expense and equity in undistributed earnings of
  subsidiaries ......................................................................        4,576        3,185         3,495
Income tax expense ..................................................................           13          151           529
                                                                                           ----------------------------------
  Income before equity in undistributed earnings of subsidiaries ....................        4,563        3,034         2,966
Equity in undistributed earnings of subsidiaries ....................................           60        2,024         1,528
                                                                                           ----------------------------------
  Net income ........................................................................      $ 4,623        5,058         4,494
                                                                                           ==================================

<CAPTION>

STATEMENTS OF CASH FLOWS
YEAR ENDED DECEMBER 31 (In thousands)                                                         1998         1997          1996
- -----------------------------------------------------------------------------------------------------------------------------
<S>                                                                                        <C>            <C>           <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income ..........................................................................      $ 4,623        5,058         4,494
                                                                                           ----------------------------------
Adjustments to reconcile net income to net cash provided by operating activities:
  Equity in undistributed earnings of subsidiaries ..................................          (60)      (2,024)       (1,528)
  Depreciation and amortization .....................................................          124          121           105
  Investment securities gains .......................................................          (26)          --            --
  Decrease (increase) in other assets ...............................................          259         (504)          (41)
  Increase (decrease) in other liabilities ..........................................           24         (133)          238
                                                                                           ----------------------------------
  Total adjustments .................................................................          320       (2,540)       (1,226)
                                                                                           ----------------------------------
  Net cash provided by operating activities .........................................        4,943        2,518         3,268
                                                                                           ==================================
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of investment securities ..................................................         (227)          --          (149)
Proceeds from investment securities sales ...........................................          175           --            --
Purchases of loan pool participations: ..............................................       (4,610)      (2,091)       (1,033)
Principal recovery on loan pool participations ......................................        4,737        5,665         7,590
Net (increase) decrease in loans ....................................................       (5,064)      (2,243)        2,655
Purchases of premises and equipment .................................................          (13)        (151)          (55)
Investment in subsidiaries ..........................................................           --       (5,000)      (10,000)
                                                                                           ----------------------------------
  Net cash used in investing activities .............................................       (5,002)      (3,820)         (992)
                                                                                           ----------------------------------
CASH FLOWS FROM FINANCING ACTIVITIES:
Advances on notes payable ...........................................................        7,450        6,500         7,800
Principal payments on notes payable .................................................       (4,500)      (2,400)       (7,900)
Dividends paid ......................................................................       (2,048)      (1,753)       (1,638)
Purchases of treasury stock .........................................................       (1,837)      (1,682)         (622)
Proceeds from stock issued ..........................................................          689          729            --
                                                                                           ----------------------------------
  Net cash (used in) provided by financing activities ...............................         (246)       1,444        (2,360)
                                                                                           ----------------------------------
  Net (decrease) increase in cash and cash equivalents ..............................         (305)         142           (84)
Cash and cash equivalents at beginning of year ......................................          636          494           578
                                                                                           ----------------------------------
Cash and cash equivalents at end of year ............................................      $   331          636           494
                                                                                           ==================================
</TABLE>

                                        F-28
<PAGE>   125
                    MIDWEST BANCSHARES, INC. and SUBSIDIARIES

                           Consolidated Balance Sheets
                                   (Unaudited)
                  (Dollars in thousands, except per share data)

<TABLE>
<CAPTION>
                                                         March 31,  December 31,
                                                            1999        1998
                                                         --------   ------------
<S>                                                      <C>         <C>
Assets
   Cash and cash equivalents                             $  3,673    $  4,088
   Securities available for sale                           37,185      33,843
   Securities held to maturity (estimated
     fair value of $23,591 and $22,116)                    23,366      21,827
   Loans receivable, net                                   94,492      96,348
   Real estate acquired through foreclosure                     3         192
   Federal Home Loan Bank stock, at cost                    2,200       2,200
   Office property and equipment, net                       2,420       2,444
   Accrued interest receivable                              1,312       1,237
   Other assets                                               332         139
                                                         --------    --------
Total assets                                             $164,983    $162,318
                                                         ========    ========
Liabilities
   Deposits                                              $107,534    $105,982
   Advances from Federal Home Loan Bank                    44,000      43,000
   Advances from borrowers for taxes and
     insurance                                                263         413
   Accrued interest payable                                    79          66
   Accrued expenses and other liabilities                     753         822
                                                         --------    --------
Total liabilities                                         152,629     150,283
                                                         --------    --------
Stockholders' equity
   Serial preferred stock, $.01 par value;
     authorized 500,000 shares; none issued                     -           -
   Common stock, $.01 par value; 2,000,000
    shares authorized;
      1,098,523 shares issued and outstanding in
      1999 and 1,077,738 shares issued and
      outstanding in 1998                                      11          11
   Additional paid-in capital                               1,841       1,772
   Retained earnings, substantially restricted             10,165       9,832
   Accumulated other comprehensive income                       -
      unrealized appreciation on securities available
      for sale                                                337         420
                                                         --------    --------
Total stockholders' equity                                 12,354      12,035
                                                         --------    --------
Total liabilities and stockholders' equity               $164,983    $162,318
                                                         ========    ========
</TABLE>


See accompanying notes to consolidated financial statements.



                                      F-29
<PAGE>   126



                    MIDWEST BANCSHARES, INC. and SUBSIDIARIES

                      Consolidated Statements of Operations
                                   (Unaudited)
                      (In thousands, except per share data)

<TABLE>
<CAPTION>
                                                               Three Months
                                                              Ended March 31,
                                                           --------------------
                                                            1999          1998
                                                           ------        ------
<S>                                                        <C>           <C>
Interest income:
   Loans receivable                                        $1,907        $1,848
   Securities available for sale                              512           629
   Securities held to maturity                                354           280
   Deposits in other financial institutions                    50            21
   Other interest-earning assets                               34            33
                                                           ------        ------
      Total interest income                                 2,857         2,811
                                                           ------        ------
Interest expense:
   Deposits                                                 1,191         1,230
   Advances from FHLB and other borrowings                    592           541
                                                           ------        ------
      Total interest expense                                1,783         1,771
                                                           ------        ------
      Net interest income                                   1,074         1,040
      Provision for losses on loans                            12            12
                                                           ------        ------
Net interest income after provision for
 losses on loans                                            1,062         1,028
                                                           ------        ------
Non-interest income:
   Fees and service charges                                    99            81
</TABLE>


                                      F-30


<PAGE>   127

<TABLE>

<S>                                                        <C>           <C>
   Gain on sale of securities available for sale                3            36
   Other                                                        4             7
                                                           ------        ------
      Total non-interest income                               106           124
                                                           ------        ------
Non-interest expense:
   Compensation and benefits                                  335           326
   Office property and equipment                               98           102
   Deposit insurance premiums                                  16            17
   Data processing                                             50            42
   Other                                                      216           205
                                                           ------        ------
      Total non-interest expense                              715           692
                                                           ------        ------
Earnings before taxes on income                               453           460
Taxes on income                                               118           149
                                                           ------        ------
Net earnings                                                 $335          $311
                                                           ======        ======

Earnings per share - basic                                  $0.31         $0.30
                                                           ======        ======
Earnings per share - diluted                                $0.30         $0.28
                                                           ======        ======
</TABLE>


See accompanying notes to consolidated financial statements.



                                      F-31
<PAGE>   128



                   MIDWEST BANCSHARES, INC. and SUBSIDIARIES

                 Consolidated Statements of Comprehensive Income
                                   (Unaudited)
                                 (In thousands)

<TABLE>
<CAPTION>
                                                              Three months ended
                                                                   March 31,
                                                              ------------------
                                                                1999        1998
                                                              ------     -------
<S>                                                           <C>        <C>
Net earnings                                                  $  335     $  311
Other comprehensive income:
  Unrealized gains (losses) on securities available for sale:
     Unrealized holding gains (losses) arising during
      the period, net of taxes on income of ($48) in
      1999 and $13 in 1998                                       (81)        28
     Less: reclassification adjustment for gains
      included in net earnings, net of taxes on
      income of $1 in 1999 and $12 in 1998                         2         24
                                                              ------     ------
Other comprehensive income, net of tax:                       $  (83)    $    4
                                                              ------     ------
Comprehensive income                                          $  252     $  315
                                                              ======     ======
</TABLE>




See accompanying notes to consolidated financial statements.


                                      F-32


<PAGE>   129


                    MIDWEST BANCSHARES, INC. and SUBSIDIARIES

                      Consolidated Statements of Cash Flows
                                   (Unaudited)
                                 (In thousands)

<TABLE>
<CAPTION>
                                                              Three months ended
                                                                  March 31,
                                                              ------------------
                                                                1999        1998
                                                              ------     -------
<S>                                                           <C>        <C>
Cash flows from operating activities:
   Net earnings                                               $  335     $  311
   Adjustments to reconcile net earnings to net
      cash provided by operating activities:
         Provision for losses on loans                            12         12
         Gain on sale of securities available for sale            (3)       (36)
         Depreciation                                             45         42
         Amortization of loan fees, premiums and discounts       (18)         -
         Increase in accrued interest receivable                 (75)      (162)
         Increase in other assets                               (193)       (24)
         Increase (decrease) in accrued interest payable          13         (4)
         Increase in accrued expenses and other liabilities       89        100
                                                              ------     ------
Net cash provided by operating activities                        205        239
                                                              ------     ------
Cash flows from investing activities:
   Purchase of securities available for sale                  (6,955)   (15,931)
   Purchase of FHLB stock                                          -       (175)
   Proceeds from maturities of securities available
    for sale                                                   1,000      2,000
   Proceeds from maturities of securities held to maturity       457          -
   Proceeds from sales of securities available for sale        2,014      2,092
   Loans purchased                                              (983)      (258)
</TABLE>




                                      F-33
<PAGE>   130


<TABLE>
<S>                                                           <C>        <C>
   Purchase of mortgage-backed securities held to maturity    (2,936)         -
   Repayment of principal on mortgage-backed securities        1,416      2,422
   Decrease (increase) in loans receivable                     2,796       (349)
   Proceeds from sale of real estate owned, net                  231          -
   Purchase of office property and equipment                     (21)       (56)
                                                              ------    -------
Net cash used in investing activities                         (2,981)   (10,255)
                                                              ------    -------
Cash flows from financing activities:
   Increase in deposits                                        1,552        208
   Proceeds from advances from FHLB                            3,000     10,500
   Repayment of advances from FHLB                            (2,000)         -
   Exercise of stock options                                      69         17
   Payment of cash dividends                                    (110)       (62)
   Net decrease in advances from borrowers for taxes
    and insurance                                               (150)      (138)
                                                              ------     ------
Net cash provided by financing activities                      2,361     10,525
                                                              ------     ------
Net (decrease) increase in cash and cash equivalents            (415)       509
Cash and cash equivalents at beginning of year                 4,088      2,524
                                                              ------     ------
Cash and cash equivalents at end of period                    $3,673     $3,033
                                                              ======     ======
Supplemental disclosures: Cash paid during the three months for:
      Interest                                                $1,769     $1,776
      Taxes on income                                              3         21
   Transfers from loans to real estate owned                      42        356
                                                              ======     ======
</TABLE>


See accompanying notes to consolidated financial statements.


                                      F-34
<PAGE>   131



                   MIDWEST BANCSHARES, INC. and SUBSIDIARIES

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                   (unaudited)

Note 1.  Significant Accounting Policies

     The consolidated financial statements for the three months ended March 31,
     1999, and 1998 have not been audited and do not include information or
     footnotes necessary for a complete presentation of financial condition,
     results of operations and cash flows in conformity with generally accepted
     accounting principles. However, in the opinion of management, the
     accompanying consolidated financial statements contain all adjustments,
     which are of a normal recurring nature, necessary for a fair presentation.
     The results of operations for the interim periods are not necessarily
     indicative of the results which may be expected for an entire year. The
     accounting policies followed by the Company are set forth in Note 1 to the
     Company's consolidated financial statements contained in the 1998 Annual
     Report to Stockholders on Form 10-KSB and are incorporated herein by
     reference.

Note 2. Computation of Per Share Earnings

     Basic earnings per share amounts are computed by dividing net earnings by
     the weighted average number of common shares outstanding during the period.
     Diluted earnings per share amounts are computed by dividing net earnings by
     the weighted average number of shares and all dilutive potential shares
     outstanding during the period. The following information was used in the
     computation of earnings per share on both a basic and diluted basis for the
     three months ended March 31, 1999 and 1998.



                                      F-35
<PAGE>   132


<TABLE>
<CAPTION>
                                                           Three Months
                                                     ---------------------------
                                                        1999             1998
                                                     ---------        ---------
<S>                                                  <C>              <C>
            Basic EPS Computation:
               Numerator - Net earnings              $ 334,788        $ 310,758
               Denominator - Weighted
                 average shares outstanding          1,095,802        1,026,573
                                                     ---------        ---------
               Basic EPS                             $    0.31        $    0.30
                                                     =========        =========
            Diluted EPS Computation:
               Numerator - Net earnings              $ 334,788        $ 310,758
                                                     ---------        ---------
               Denominator - Weighted
                 average shares outstanding          1,095,802        1,026,573
               Stock options                            15,434           75,444
                                                     ---------        ---------
                                                     1,111,236        1,102,017
                                                     ---------        ---------
               Diluted EPS                           $    0.30        $    0.28
                                                     =========        =========
</TABLE>


Note 3. Merger Agreement

     On February 2, 1999, the Company announced the execution of definitive
     merger agreement with Mahaska Investment Company. the merger will be
     accomplished through a tax-free fixed exchange of one share of Mahaska
     Investment Company common stock for each share of outstanding common stock
     of the Company. The transaction is expected to be completed in the third
     quarter of 1999, after customary regulatory and shareholder approvals have
     been received.


                                      F-36
<PAGE>   133
                          INDEPENDENT AUDITORS' REPORT


The Board of Directors
Midwest Bancshares, Inc.
Burlington, Iowa:


We have audited the accompanying consolidated balance sheets of Midwest
Bancshares, Inc. and subsidiaries as of December 31, 1998 and 1997, and the
related consolidated statements of operations, stockholders' equity and
comprehensive income, and cash flows for each of the years in the three-year
period ended December 31, 1998. These financial statements ate the
responsibility of the Company's management. Our responsibility is to express an
opinion on these consolidated financial statements based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements. An audit
also includes assessing the accounting principles used and significant
estimates made by management, as well as evaluating the overall financial
statement presentation. We believe that our audits provide a reasonable basis
for our opinion.

In our opinion, the consolidated financial statements referred to above present
fairly, in all material respects, the financial position of Midwest
Bancshares, Inc. and subsidiaries as of December 31, 1998 and 1997, and the
results of their operations and their cash flows for each of the years in the
three-year period ended December 31, 1998, in conformity with generally
accepted accounting principles.




KPMG LLP

Des Moines, Iowa
January 22, 1999, except for note 16
     which is as of February 2, 1999.







                                      F-37
<PAGE>   134
                 MIDWEST BANCSHARES, INC. AND SUBSIDIARIES

                        Consolidated Balance Sheets

                        December 31, 1998 and 1997


<TABLE>
<CAPTION>
<S>                                                                <C>                <C>
                     ASSETS                                            1998               1997
                                                                   ------------       ------------

Cash and cash equivalents                                          $  4,087,677          2,523,983
Securities available for sale (note 2)                               33,842,698         27,934,974
Securities held to maturity (estimated fair
   value of $22,116,475 and $20,055,364) (notes 2 and 7)             21,826,889         19,839,678
Loans receivable, net (notes 3, 4, and 8)                            96,347,716         91,276,434
Real estate acquired through foreclosure                                191,741            314,583
Federal Home Loan Bank (FHLB) stock, at cost                          2,200,000          1,959,700
Office property and equipment, net (note 5)                           2,444,356          2,560,749
Accrued interest receivable (note 6)                                  1,237,155          1,203,471
Other assets                                                            139,736            110,869
                                                                   ------------       ------------

         Total assets                                              $162,317,968        147,724,441
                                                                   ============       ============

                   LIABILITIES AND STOCKHOLDERS' EQUITY

Liabilities:
   Deposits (note 7)                                               $105,982,327        105,278,292
   Advances from FHLB (note 8)                                       43,000,000         30,500,000
   Advances from borrowers for taxes and  insurance                     412,903            387,881
   Accrued interest payable                                              65,566             80,175
   Accrued expenses and other liabilities                               822,428            802,632
                                                                   ------------       ------------

         Total liabilities                                          150,283,224        137,048,980
                                                                   ------------       ------------

Stockholders' equity (notes 10 and 11):
   Serial preferred stock, $.01 par value;
    authorized 500,000 shares; none issued                                   --                 --
   Common stock, $.01 par value;
    2,000,000 shares authorized; 1,077,738 shares issued
    and outstanding in 1998
    and 1,020,762 shares issued and
    outstanding in 1997                                                  10,777             10,208
   Additional paid-in capital                                         1,771,495          1,530,430
   Retained earnings, substantially restricted                        9,832,094          8,821,782
   Employee Stock Ownership Plan (ESOP)                                      --            (60,000)
   Accumulated other comprehensive income -
    unrealized gains
    on securities available for sale, net of
    taxes on income of $250,000 in 1998 and $222,000 in 1997            420,378            373,041
                                                                   ------------       ------------

         Total stockholders' equity                                  12,034,744         10,675,461

   Contingencies (note 15)
                                                                   ------------       ------------

         Total liabilities and stockholders'equity                 $162,317,968        147,724,441
                                                                   ============       ============
</TABLE>


See accompanying notes to consolidated financial statements.


                                      F-38
<PAGE>   135
                    MIDWEST BANCSHARES, INC. AND SUBSIDIARIES

                      Consolidated Statements of Operations

                  Years ended December 31, 1998, 1997, and 1996

<TABLE>
<CAPTION>
                                                                   1998             1997             1996
                                                                -----------       ----------       ----------
<S>                                                             <C>                <C>              <C>
Interest income:
   Loans receivable                                             $ 7,536,716        7,074,649        6,444,056
   Securities available for sale                                  2,361,999        2,073,271        1,902,576
   Securities held to maturity                                    1,202,933        1,388,444        1,609,591
   Deposits in other financial institutions                         100,210           75,365           68,717
   Other interest-earning assets                                    140,526          138,271          137,496
                                                                -----------       ----------       ----------

                                                                 11,342,384       10,750,000       10,162,436
                                                                -----------       ----------       ----------
Interest expense:
   Deposits (note 7)                                              4,924,651        5,039,036        4,726,637
   Advances from FHLB and other borrowings                        2,302,514        1,681,261        1,516,060
                                                                -----------       ----------       ----------

                                                                  7,227,165        6,720,297        6,242,697
                                                                -----------       ----------       ----------

         Net interest income                                      4,115,219        4,029,703        3,919,739

Provision for losses on loans (note 4)                               47,907           48,000           47,972
                                                                -----------       ----------       ----------

         Net interest income after                                4,067,312        3,981,703        3,871,767
         provision for losses on loans
                                                                -----------       ----------       ----------

Noninterest income:
   Fees and service charges                                         375,891          282,249          179,326
   Gain on sale of securities available for sale (note 2)           117,920          220,223           29,213
   Other                                                            170,078           51,214          140,481
                                                                -----------       ----------       ----------

                                                                    663,889          553,686          349,020
                                                                -----------       ----------       ----------
Noninterest expenses:
   Compensation and benefits (note 10)                            1,348,638        1,285,960        1,181,748
   Office property and equipment                                    423,224          364,804          349,156
   Deposit insurance premiums                                        64,596           53,687          236,989
   Deposit insurance special assessment (note 12)                        --               --          670,861
   Data processing                                                  173,964          164,087          164,939
   Other                                                            799,521          712,937          613,436
                                                                -----------       ----------       ----------
                                                                  2,809,943        2,581,475        3,217,129
                                                                -----------       ----------       ----------

         Earnings before taxes on income                          1,921,258        1,953,914        1,003,658

Taxes on income (note 9)                                            549,000          689,000          374,000
                                                                -----------       ----------       ----------

         Net earnings                                           $ 1,372,258        1,264,914          629,658
                                                                ===========       ==========       ==========

Earnings per share - basic                                      $      1.31             1.23             0.59
                                                                ===========       ==========       ==========

Earnings per share - diluted                                    $      1.25             1.14             0.56
                                                                ===========       ==========       ==========
</TABLE>


See accompanying notes to consolidated financial statements.

                                      F-39
<PAGE>   136
                    MIDWEST BANCSHARES, INC. AND SUBSIDIARIES
                 Consolidated Statements of Stockholders' Equity
                      and Comprehensive Income Years ended
                        December 31, 1998, 1997, and 1996

<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                   EMPLOYEE
                                                                                    STOCK
                                                                                   OWNERSHIP RECOGNITION  ACCUMULATED
                                              ADDITIONAL                             PLAN       AND         OTHER
                                     COMMON    PAID-IN     RETAINED    TREASURY    BORROWING RETENTION   COMPREHENSIVE
                                     STOCK     CAPITAL     EARNINGS     STOCK      GUARANTEE   PLAN         INCOME       TOTAL
- ---------------------------------- ---------- ----------- ----------- ----------- ----------- ---------- ------------ -------------

<S>                                <C>         <C>         <C>        <C>          <C>         <C>          <C>         <C>
Balance at December 31,            $  4,550    4,037,058   7,403,062  (1,699,533)  (180,000)   (9,725)      340,526     9,895,938
1995

Net earnings                             --           --     629,658          --         --         --           --       629,658
Unrealized losses during the year
on securities available for sale                                                                           (307,852)     (307,852)
Realized gains on securities
available for sale, net of taxes         --           --          --          --         --         --       19,800        19,800
                                    -------  ----------- ----------- -----------  --------- ----------    ---------   -----------

       Total comprehensive income        --           --     629,658          --         --         --     (288,052)      341,606

Dividends declared ($.187 per            --           --    (195,912)         --         --         --           --      (195,912)
     share*)
Treasury stock acquired                  --           --          --    (511,109)        --         --           --      (511,109)
ESOP loan payment                        --           --          --          --     60,000         --           --        60,000
Amortization of recognition
    and retention plan                   --           --          --          --         --      9,725           --         9,725
                                     ------   ----------  ----------  ----------   --------  ---------     --------    ----------

Balance at December 31, 1996          4,550    4,037,058   7,836,808  (2,210,642)  (120,000)        --       52,474     9,600,248

Net earnings                             --           --   1,264,914          --         --         --           --     1,264,914
Unrealized gains during the year
    on securities available for
    sale                                 --           --          --          --         --         --      463,717       463,717
Realized gains on securities
    available for sale, net of
    taxes                                --           --          --          --         --         --     (143,150)     (143,150)
                                     ------   ----------  ----------  ----------   --------  ---------     --------    ----------

       Total comprehensive income        --           --   1,264,914          --         --         --      320,567     1,585,481

Dividends declared ($.22 per
    share*)                              --           --    (225,624)         --         --         --           --      (225,624)
Treasury stock acquired                  --           --          --    (393,659)        --         --           --      (393,659)
ESOP loan payment                        --           --          --          --     60,000         --           --        60,000
Issuance of shares of common stock
     under the stock option plan
     (note 10)                           28       26,237     (54,316)     77,066         --         --           --        49,015
3-for-1 stock split effected in the
     form of a 200% stock dividend
     (note 11)                        5,630   (2,532,865)         --   2,527,235         --         --           --            --
                                     ------   ----------  ----------  ----------   --------  ---------     --------    ----------

Balance at December 31, 1997         10,208    1,530,430   8,821,782          --    (60,000)        --      373,041    10,675,461

Net earnings                             --           --   1,372,258          --         --         --           --     1,372,258
Unrealized gains during the year on
    securities available for sale        --           --          --          --         --         --      123,987       123,987
Realized gains on securities
    available for sale, net of
    taxes                                --           --          --          --         --         --      (76,650)      (76,650)
                                     ------   ----------  ----------  ----------   --------  ---------     --------    ----------

       Total comprehensive income        --           --   1,372,258          --         --         --       47,337     1,419,595

Dividends declared ($.34 per share)      --           --    (361,946)         --         --         --           --      (361,946)
ESOP loan payment                        --           --          --          --     60,000         --           --        60,000
Issuance of shares of common stock
     under the stock option plan
     (note 10)                          569      241,065          --          --         --         --           --       241,634
                                     ------   ----------  ----------  ----------   --------  ---------     --------    ----------

Balance at December 31, 1998       $ 10,777    1,771,495   9,832,094          --         --         --      420,378    12,034,744
                                     ======   ==========  ==========  ==========   ========  =========     ========    ==========
</TABLE>


* Reflects the 3-for-1 stock split effected in the form of a 200 percent
dividend in November 1997.


See accompanying notes to consolidated financial statements.


                                      F-40
<PAGE>   137
                    MIDWEST BANCSHARES, INC. AND SUBSIDIARIES
                      Consolidated Statements of Cash Flows
                  Years ended December 31, 1998, 1997, and 1996

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------------
                                                                 1998               1997              1996
                                                             ------------        -----------        ----------
<S>                                                          <C>                   <C>               <C>
Cash flows from operating activities:
    Net earnings                                             $  1,372,258          1,264,914           629,658
    Adjustments to reconcile net earnings to net
       cash provided by operating activities:
         Provision for losses on loans                             47,907             48,000            47,972
         Depreciation                                             190,663            161,250           144,301
         Provision for deferred taxes                             170,000             96,000            24,000
         Gain on sale of securities available for
             sale                                                (117,920)          (220,223)          (29,213)
         Gain on sale of securities held to
             maturity                                                  --                 --           (15,950)
         Amortization of recognition and retention
             plan benefits                                             --                 --             9,725
         ESOP expense                                              60,100             56,482            53,938
         Amortization of premiums and discounts                   (31,594)           (25,496)           76,778
         Increase in accrued interest receivable                  (33,684)          (195,924)         (133,035)
         (Increase) decrease in other assets                      (28,867)            (9,961)           90,050
         (Decrease) increase in accrued interest
             payable                                              (14,609)             6,432             2,236
         (Decrease) increase in accrued expenses an  d
             other liabilities                                   (224,832)           160,229          (194,335)
                                                             ------------        -----------        ----------

         Net cash provided by operating activities              1,389,422          1,341,703           706,125
                                                             ------------        -----------        ----------

Cash flows from investing activities:
    Purchase of securities                                    (33,196,242)       (14,680,737)       (5,568,000)
    Proceeds from maturities of securities                     20,000,000          9,490,000         8,323,885
</TABLE>


                                      F-41
<PAGE>   138
<TABLE>
<S>                                                          <C>                   <C>               <C>
    Proceeds from sale of securities available
        for sale                                                7,297,627            798,473           550,239
    Loans purchased                                            (1,164,815)        (6,955,215)       (5,555,413)
    Purchase of mortgage-backed securities                    (12,022,831)        (3,484,096)       (4,051,131)
    Purchase of FHLB stock                                       (240,300)                --                --
    Repayments of principal on mortgage-backed
        securities                                             10,247,389          6,464,986         5,862,203
    Increase in loans receivable                               (4,479,351)        (3,505,057)       (1,800,202)
    Proceeds from sale of real estate owned, net                  651,792             47,235           155,042
    Purchase of office property and equipment                     (74,270)          (275,016)         (276,470)
                                                             ------------        -----------        ----------

         Net cash used in investing activities                (12,981,001)       (12,099,427)       (2,359,847)
                                                             ------------        -----------        ----------
Cash flows from financing activities:
    Increase in deposits                                          704,035          3,360,527           583,328
    Proceeds from advances from  FHLB                          33,700,000          8,500,000         8,000,000
    Repayment of advances from FHLB                           (21,200,000)        (2,000,000)       (4,500,000)
    Net increase (decrease) in advances from
       borrowers for taxes and  insurance                          25,022              9,446           (33,992)
    Treasury stock acquired                                            --           (393,659)         (511,109)
    Stock options exercised                                       241,634             24,015                --
    Payment of cash dividends                                    (315,418)          (216,785)         (191,453)
                                                             ------------        -----------        ----------

         Net cash provided by financing activities             13,155,273          9,283,544         3,346,774
                                                             ------------        -----------        ----------

         Net increase (decrease) in cash and cash
              equivalents                                       1,563,694         (1,474,180)        1,693,052

Cash and cash equivalents at beginning of year                  2,523,983          3,998,163         2,305,111
                                                             ------------        -----------        ----------

Cash and cash equivalents at end of year                     $  4,087,677          2,523,983         3,998,163
                                                             ============        ===========        ==========

Supplemental disclosures of cash flow information:
    Cash paid during the year for:
       Interest                                              $  7,241,774          6,713,865         6,240,461
       Taxes on                                                   351,760            485,140           531,654
       income
    Transfers from loans to real estate acquired
        through foreclosure                                       528,950            349,818           134,098
                                                             ============        ===========        ==========
</TABLE>

See accompanying notes to consolidated financial statements.


                                      F-42

<PAGE>   139
                    MIDWEST BANCSHARES, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements

                           December 31, 1998 and 1997



(1)  Summary of Significant Accounting Policies

     Description of Business

     Midwest Bancshares, Inc. (the Company or Parent Company) is a Delaware
corporation operating as a savings and loan holding company. The Company owns
all of the outstanding stock of Midwest Federal Savings and Loan Association of
Eastern Iowa (the Association).

     The Association serves Des Moines, Lee, and Louisa Counties in southeastern
Iowa through its five retail banking offices located in Burlington, Wapello, and
Ft. Madison, Iowa. The Association is primarily engaged in attracting retail
deposits from the general public and investing those funds in first mortgages on
owner-occupied, single-family residential loans and mortgage-backed securities.
Midwest Financial Products, Inc., a wholly owned subsidiary of the Association,
is engaged in the marketing of financial products.

     Principles of Consolidation

     The consolidated financial statements include the accounts of Midwest
Bancshares, Inc. and its wholly owned subsidiary; Midwest Federal Savings and
Loan Association of Eastern Iowa and its subsidiary; Midwest Financial Products,
Inc. All material intercompany accounts and transactions have been eliminated.

     The consolidated financial statements have been prepared in accordance with
generally accepted accounting principles. In preparing such financial
statements, management is required to make estimates and assumptions that affect
the reported amounts of assets and liabilities and disclosure of contingent
assets and liabilities as of the date of the balance sheet and revenues and
expenses for the period. Actual results could differ significantly from those
estimates. Material estimates that are particularly susceptible to significant
change relate to the determination of the allowance for loan losses.

     Regulatory Capital

     The Association is required by the Office of Thrift Supervision (OTS) to
maintain prescribed levels of regulatory capital. At December 31, 1998, the
Association met the requirements, and management anticipates meeting the
requirements at December 31, 1999 (see note 11).

     Cash and Cash Equivalents

     For purposes of reporting cash flows, the Company includes cash and due
from other financial institutions and interest-bearing deposits with original
maturities of three months or less in cash and cash equivalents. Amounts of
interest-bearing deposits included as cash equivalents at December 31, 1998 and
1997, were $2,977,766 and $1,088,237, respectively.

     Earnings Per Share

     Basic earnings per share amounts are computed by dividing net income by the
weighted average number of common shares outstanding during the year. Diluted
earnings per share amounts are computed by dividing net income by the weighted
average number of shares and all dilutive potential shares outstanding during
the year. As further discussed in note 11, the Company declared a 3-for-1 stock
split effected in the form of a stock dividend in 1997. The average number of
shares and dilutive

                                      F-43

<PAGE>   140
                    MIDWEST BANCSHARES, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements




potential shares have been restated for the stock split. The following
information was used in the computation of earnings per share on both a basic
and diluted basis for the years ended December 31, 1998, 1997, and 1996.

<TABLE>
<CAPTION>
                                      1998            1997            1996
                                   ----------       ---------       ---------
<S>                                <C>              <C>             <C>
Basic EPS Computation:
   Numerator -
      Net income                   $1,372,258       1,264,914         629,658
   Denominator -
      Weighted average
          shares outstanding        1,048,233       1,032,310       1,061,442
                                   ----------       ---------       ---------

Basic EPS                          $     1.31            1.23            0.59
                                   ==========       =========       =========

Diluted EPS Calculation:
   Numerator -
      Net income                   $1,372,258       1,264,914         629,658
                                   ----------       ---------       ---------

Denominator:
   Weighted average
      shares outstanding            1,048,233       1,032,310       1,061,442
   Stock options                       53,750          75,631          62,941
                                   ----------       ---------       ---------
                                    1,101,983       1,107,941       1,124,383
                                   ----------       ---------       ---------
Diluted EPS                        $     1.25            1.14            0.56
                                   ==========       =========       =========
</TABLE>


     Securities

     The Company's method of classifying debt securities is based on the
intended holding period. Securities which may be sold prior to maturity to meet
liquidity needs, to respond to market changes, or to adjust the asset-liability
position are classified as available for sale. Securities which the Company
intends to hold to maturity are classified as held to maturity.

     Securities available for sale are recorded at fair value. The aggregate
unrealized gains or losses, net of the effect of taxes on income are recorded as
a component of stockholders' eSecurities for which the Company has the positive
intent and ability to hold to maturity are reported at cost, adjusted for
amortization of premium or accretion of discount, over the term of the security
using the interest method. Original issue discounts on short-term securities are
accreted as accrued interest receivable over the lives of such securities.

     Mortgage-backed securities for which the Company has the positive intent
and ability to hold to maturity are reported at amortized cost. Premiums and
discounts are amortized and accreted using the interest method over the
remaining period to contractual maturity, adjusted for prepayments. Actual
prepayment experience is periodically reviewed, and the amortization and
accretion is adjusted accordingly. In 1996, certain mortgage-backed securities
with remaining principal balances of less than 15 percent of original purchase
amounts were sold (see note 2).


                                                                     (Continued)


                                      F-44
<PAGE>   141
                    MIDWEST BANCSHARES, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements


     Gain or loss on sale is recognized in the statement of operations using the
specific identification method.

     Allowances for Losses on Loans and Real Estate

     The allowance for losses on loans is increased by charges to operations and
decreased by net charge-off and is maintained at an amount considered adequate
to provide for such losses. The allowance for losses on loans is based on
management's periodic evaluation of the loan portfolio and reflects an amount
that, in management's opinion, is adequate to absorb losses in the existing
portfolio. In evaluating the portfolio, management takes into consideration
numerous factors, including current economic conditions, prior loan loss
experience, the composition of the loan portfolio, and management's estimate of
anticipated credit losses.

     Real estate acquired is carried at the lower of cost or fair value less
estimated costs of disposition. When a property is acquired through foreclosure
or a loan is considered impaired, any excess of the loan balance over fair value
of the property plus disposition costs is charged to the allowance for losses on
loans. When circumstances indicate additional loss on the property, a direct
charge to the provision for losses on real estate is made, and the real estate
is recorded net of such provision.

     Accrued interest receivable in arrears which management believes is
doubtful of collection (generally when a loan becomes 90 days delinquent) is
charged to income. Subsequent interest income is not recognized on such loans
until collected or until determined by management to be collectible.

     Under the Company's credit policies, all nonaccrual and restructured loans
are considered to meet the definition of impaired loans. Loan impairment is
measured based on the present value of expected future cash flows, discounted at
the loan's effective interest rate except, where more practical, at the
observable market price of the loan or the fair value of the collateral if the
loan is collateral dependent.

     Unearned Loan Fees and Discounts

     Loan origination and commitment fees charged to borrowers and certain
direct costs related to originations are deferred and amortized into interest
income using the interest method. Direct loan origination costs for other loans
are expensed, as such costs are not material in amount.

     Premiums and discounts on loans are amortized primarily over the expected
remaining life of the related loans using the interest method.

     Concentrations of Credit Risk

     The Association grants residential and commercial real estate loans and
other consumer and commercial loans, primarily in its central Iowa market area.
Although the Company has a diversified loan portfolio, a substantial portion of
its borrowers' ability to repay their loans is dependent upon economic
conditions in the Company's market area.


                                                                     (Continued)


                                      F-45

<PAGE>   142
                    MIDWEST BANCSHARES, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements


     Financial Instruments with Off Balance Sheet Risk

     In the normal course of business to meet the financing needs of its
customers, the Company is a party to financial instruments with off balance
sheet risk, which include commitments to extend credit. The Company's exposure
to credit loss in the event of nonperformance by the other party to the
commitments to extend credit is represented by the contractual amount of those
instruments. The Company uses the same credit policies in making commitments as
it does for on balance sheet instruments.

     Commitments to extend credit are agreements to lend to a customer as long
as there are no violations of any conditions established in the contract.
Commitments generally have fixed expiration dates or other termination clauses
and may require payment of a fee. Since some of the commitments are expected to
expire without being drawn upon, the total commitment amounts do not necessarily
represent future cash requirements (see note 3). The Company evaluates each
customer's creditworthiness on a case-by-case basis. The amount of collateral
obtained if deemed necessary by the Company upon extension of credit is based on
management's credit evaluation of the counterparty.

     Office Property and Equipment

     Office property and equipment are recorded at cost, and depreciation is
provided primarily using the straight-line basis over the estimated useful lives
of the related assets, which range from 25 to 50 years for office buildings and
from 5 to 15 years for furniture, fixtures, and equipment.

     Maintenance and repairs are charged against income. Betterments are
capitalized and subsequently depreciated. The cost and accumulated depreciation
of properties retired or otherwise disposed of are eliminated from the asset and
accumulated depreciation accounts. Related profit or loss from such transactions
is credited or charged to income.

     Taxes on Income

     The Company files a consolidated federal income tax return. Federal income
taxes are allocated based on taxable income or loss included in the consolidated
return. For state tax purposes, the Association files a franchise tax return.
The Parent Company and the Association's subsidiary file corporate income tax
returns.

     Under the asset and liability method, deferred tax assets and liabilities
are recognized for the future tax consequences attributable to differences
between the financial statement carrying amounts of existing assets and
liabilities and their respective tax bases. Deferred tax assets and liabilities
are measured using enacted tax rates expected to apply to taxable income in the
years in which those temporary differences are expected to be recovered or
settled. The effect of a change in tax rates on deferred tax assets and
liabilities is recognized in income in the period that includes the enactment
date.

     Stock Option Plan

     The company provides pro forma net income and pro forma earnings per share
disclosures for material employee stock option grants made in 1996 and future
years as if the fair-value-based method, which recognizes as expense over the
vesting period the fair value of stock-based at the date of grant, had been
applied.


                                                                     (Continued)


                                      F-46
<PAGE>   143
                    MIDWEST BANCSHARES, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements


     Fair Value of Financial Instruments

     The Company discloses the estimated fair values for its financial
instruments. Fair value estimates, methods, and assumptions are set forth below.

     Cash and Cash Equivalents

     The carrying amount is a reasonable estimate of fair value.

     Securities Available for Sale and Held to Maturity

     The fair value of securities is estimated based on bid prices published in
financial newspapers, bid quotations received from securities dealers, or quoted
market prices of similar instruments, adjusted for differences between the
quoted instruments and the instruments being valued.

     Loans

     Fair values are estimated for portfolios of loans with similar financial
characteristics. Loans are segregated by type, such as real estate, consumer,
and commercial.

     The fair value of single family residential loans is calculated by
obtaining quoted market prices of similar loans that are sold in conjunction
with securitization transactions.

     The fair value of all other loans is calculated by discounting scheduled
cash flows through the estimated maturity using estimated market discount rates
that reflect the credit and interest rate risk inherent in the loan. The
estimate of maturity is based on the Company's historical experience, with
repayments for each loan classification, modified, as required, by an estimate
of the effect of current economic and lending conditions. The effect of
nonperforming loans is considered in assessing the credit risk inherent in the
fair value estimate.

     FHLB Stock

     The fair value of FHLB stock is equivalent to its carrying value, because
it is redeemable at par value.

     Deposits

     The fair value of deposits with no stated maturity, such as passbook; money
market; noninterest-bearing checking; and checking accounts, is estimated to be
the amount payable on demand. The fair value of certificates of deposit is based
on the discounted value of contractual cash flows. The discount rate is
estimated using the rates currently offered for deposits of similar remaining
maturities. The fair value estimates do not include the benefit that results
from the low-cost funding provided by the deposit liabilities compared to the
cost of borrowing funds in the market.

     Advances from FHLB

     The fair value of advances from the FHLB is calculated by discounting the
scheduled payments through maturity. The discount rate is estimated using the
rates currently offered for similar instruments.


                                                                     (Continued)

                                      F-47

<PAGE>   144
                    MIDWEST BANCSHARES, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements



     Off Balance Sheet Assets (Liabilities)

     The unrealized gains and losses of commitments to external credits are
estimated using the difference between current levels of interest rates and
committed rates. The unrealized gains and losses of letters of credit are based
on fees currently charged for similar agreements.

     Limitations

     Fair value estimates are made at a specific point in time, based on
relevant market information and information about the financial instrument.
Because no market exists for a significant portion of the Company's financial
instruments, fair value estimates are based on judgments regarding future
expected loss experience, current economic conditions, risk characteristics of
various financial instruments, and other factors. These estimates are subjective
in nature and involve uncertainties and matters of significant judgment and,
therefore, cannot be determined with precision. Changes in assumptions could
significantly affect the estimates.

     Effect of New Financial Accounting Standards

     The Company adopted the provisions of SFAS No. 130, Reporting Comprehensive
Income, effective January 1, 1998. SFAS No. 130 establishes the standards for
the reporting and display of comprehensive income in the financial statements.
Comprehensive income represents net income and certain amounts reported directly
in stockholders' equity, such as the net unrealized gain or loss on
available-for-sale securities. The statement requires additional disclosures in
the consolidated financial statements; it does not effect the Company's
financial positions or results of operations. Prior year consolidated financial
statements have been reclassified to conform to the requirements of SFAS No.
130.

     The Company adopted the provisions of SFAS No. 131, Disclosures About
Segments of an Enterprise and Related Information, effective January 1, 1998.
SFAS No. 131 establishes disclosure requirements for segment operations. The
adoption had no effect on the Company's financial statement disclosures.

     SFAS 125, "Accounting for Transfers and Servicing of Financial Assets and
Extinguishments of Liabilities," was effective for the Company for the year
beginning January 1, 1997, and did not have a material effect on the financial
position and results of operations, nor did the adoption require additional
capital resources.

     SFAS No. 133, Accounting for Derivative Instruments and Hedging Activities,
will be effective for the Company for the year beginning January 1, 2000.
Management is evaluating the impact the adoption will have on the Company's
consolidated financial statements. The Company expects to adopt SFAS No. 133
when required. Adoption is not expected to have a material effect on the
financial position and results of operations.

     Reclassifications

     Certain amounts previously reported have been reclassified to conform with
the presentation in these financial statements.


                                                                     (Continued)

                                       F-48
<PAGE>   145
                    MIDWEST BANCSHARES, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements


(2)  Debt and Equity Securities

     Debt and equity securities have been classified in the consolidated balance
sheets according to management's intent. The carrying amount of securities and
their approximate fair values at December 31, 1998 and 1997, follow.

     Securities available for sale:

<TABLE>
<CAPTION>
                                                                             Gross             Gross
                                                      Amortized            unrealized        unrealized           Fair
                    Description                          cost                gains             losses            values
                    -----------                      -----------           ----------        ----------        ----------
<S>                                                 <C>                    <C>               <C>               <C>
1998:
     Government National Mortgage Association
          (GNMA) mortgage-backed securities          $ 5,461,021            309,023               --            5,770,044
     Marketable equity securities                        308,750            137,500             59,825            386,425
     Municipal bonds:
          Due from one to five years                     300,000              6,750               --              306,750
          Due from five to ten years                   1,910,000             47,175               --            1,957,175
          Due after ten years                         10,189,357            168,574               --           10,357,931
     U.S. agency obligations:
          Due from one to five years                  10,014,384             57,489               --           10,071,873
          Due from five to ten years                   2,000,000              3,125               --            2,003,125
          Due after ten years                          2,988,807                568               --            2,989,375
                                                     -----------            -------             ------         ----------
                                                     $33,172,319            730,204             59,825         33,842,698
                                                     ===========            =======             ======         ==========
1997:
     GNMA mortgage-backed securities                 $ 7,641,683            442,566               --            8,084,249
     Marketable equity securities                        654,030            253,750             84,030            823,750
     Municipal bonds:
          Due from one to five years                     440,000              3,850               --              443,850
          Due from five to ten years                   1,605,000             18,638               --            1,623,638
          Due after ten years                          1,021,115             19,622               --            1,040,787
     U.S. agency obligations:
          Due from one to five years                   2,990,163             24,865              3,778          3,011,250
          Due from five to ten years                   2,000,000                ---             10,000          1,990,000
          Due after ten years                         10,987,943              1,202             71,645         10,917,500
                                                     -----------            -------            -------         ----------
                                                     $27,339,934            764,493            169,453         27,934,974
                                                     ===========            =======            =======         ==========
</TABLE>



                    MIDWEST BANCSHARES, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements


     There were no sales of mortgage-backed securities, which were held
available for sale, in 1998 or 1997. Proceeds from the sale of mortgage-backed
securities amounted to $550,239, resulting in gains of $29,213 during the year
ended December 31, 1996. Proceeds from the sale of marketable equity securities
amounted to $440,123, $798,473, and $-0-, resulting in gains of $93,550,
$220,223, and $-0- and losses of $28,707, $-0-, and $-0- during the three years
ended December 31, 1998, respectively. Proceeds from the sale of municipal bonds
amounted to $3,833,285, $-0-, and $-0-, resulting in gains of $20,820, $-0-, and
$-0- during the three years ended December 31, 1998, respectively. Proceeds from
the sale of U.S. agency obligations amounted to $3,024,219, $-0-, and $-0-,
resulting in gains of $32,257, $-0-, and $-0- during the three years ended
December 31, 1998, respectively.

                                                                     (Continued)

                                       F-49
<PAGE>   146
                    MIDWEST BANCSHARES, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements



     Securities held to maturity:

<TABLE>
<CAPTION>
                                                                           Gross             Gross
                                                    Amortized            unrealized        unrealized                Fair
                    Description                        cost                gains             losses                  values
                    -----------                        ----                -----             ------                  ------
<S>                                                 <C>                   <C>               <C>                    <C>
1998:
Mortgage-backed securities:
     Federal Home Loan Mortgage
          Corporation (FHLMC)                      $13,447,847            133,691                 4,969            13,576,569
     Federal National Mortgage
          Association (FNMA)                         7,585,614            176,020                15,156             7,746,478
     Resolution Trust Corporation (RTC)                336,906                 --                    --               336,906
U.S. agency obligations-
     Due in one year or less                           456,522                 --                    --               456,522
                                                   -----------            -------            ----------            ----------
                                                   $21,826,889            309,711                20,125            22,116,475
                                                   ===========            =======            ==========            ==========

1997:

Mortgage-backed securities:
     FHLMC                                         $ 8,829,148             75,772                25,190             8,879,730
     FNMA                                            8,115,716            175,497                    --             8,291,213
     RTC                                               438,579                461                    --               439,040
U.S. agency obligations-
     Due in one year                                 2,456,235                 --                10,854             2,445,381
                                                   -----------            -------            ----------            ----------
                                                   $19,839,678            251,730                36,044            20,055,364
                                                   ===========            =======            ==========            ==========
</TABLE>


     At December 31, 1998 and 1997, mortgage-backed securities were comprised of
fixed rate securities of $11,501,289 and $6,673,987, respectively; adjustable
rate securities of $3,549,772 and $4,631,763, respectively; fixed rate
seven-year balloon securities of $6,319,306 and $2,273,558, respectively; and
fixed rate five-year balloon securities of $-0- and $3,804,135, respectively.


                                                                     (Continued)

                                   F-50
<PAGE>   147
                    MIDWEST BANCSHARES, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements



(3)  Loans Receivable

     Loans receivable at December 31, 1998 and 1997, are summarized as follows:

<TABLE>
<CAPTION>
                                                      1998               1997
                                                  -----------        -----------
<S>                                               <C>                 <C>
Real estate loans:
     One- to four-family                          $71,535,021         66,549,359
     Commercial/multi-family                        9,653,163         11,209,675
     Construction                                   1,862,300            817,905
                                                  -----------        -----------
          Total real estate loans                  83,050,484         78,576,939

Consumer and other loans                           14,423,441         14,167,194
                                                  -----------        -----------
                                                   97,473,925         92,744,133
                                                  -----------        -----------
Less:
     Loans in process                                 563,542            835,737
     Unearned discounts and
          deferred loan fees                           82,667             63,962
     Allowance for losses on loans                    480,000            568,000
                                                  -----------        -----------
                                                    1,126,209          1,467,699
                                                  -----------        -----------
                                                  $96,347,716         91,276,434
                                                  ===========        ===========
</TABLE>


     The Company originates residential and commercial real estate loans and
other consumer and commercial loans, primarily in its Iowa market area and
adjacent counties in Illinois. In addition, the Company purchases residential
loans located in other states. At December 31, 1998, the geographic location of
the Company's loan portfolio was as follows: local market area, 90.4 percent;
Wisconsin, 5.7 percent; California, 3.1 percent; and other states, 0.8 percent.
Although the Company has a diversified loan portfolio, a substantial portion of
its borrowers' ability to repay their loans is dependent upon economic
conditions in the Company's market area.

     At December 31, 1998, the Association had outstanding commitments to
originate loans totaling $740,000, which included fixed rate commitments of
$529,000 at 7.05 percent weighted-average interest rate and commitments to
purchase loans totaling $719,000. The Association also had unused lines of
credit totaling $2,228,000 at a variable rate indexed to the Bank Prime rate.

     Loans on nonaccrual status and considered impaired amounted to $172,000 and
$769,000 at December 31, 1998 and 1997, respectively. The allowance for loan
losses related to these nonaccrual loans were $17,000 and $157,000,
respectively. There were no nonaccrual loans that were not subject to related
allowances for loan losses at December 31, 1998 and 1997. The average balances
of nonaccrual loans for the years ended December 31, 1998, 1997, and 1996, were
$355,000; $885,000; and $429,000, respectively. For the years ended December 31,
1998, 1997, and 1996, interest income which would have been recorded under the
original terms of the loans was approximately $15,000; $79,000; and $103,000,
respectively, and interest income actually recorded amounted to approximately
$9,000; $25,000; and $56,000, respectively.


                                                                     (Continued)


                                        F-51
<PAGE>   148
                    MIDWEST BANCSHARES, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements



     Loan customers of the Association include certain executive officers and
directors and their related interests and associates. All loans to this group
were made in the ordinary course of business at prevailing terms and conditions.
Such loans at December 31, 1998 and 1997, amounted to $868,974 and $852,861,
respectively. During the year ended December 31, 1998, new loans totaled
$435,865 and repayments totaled $419,752.

(4)  Allowance for Losses on Loans

     A summary of the allowance for losses on loans for the three years ended
December 31, 1998, follows:

<TABLE>
<CAPTION>
                                        1998            1997            1996
                                     ----------      ----------       ---------
<S>                                  <C>               <C>             <C>
Balance at beginning of year         $ 568,000         686,000         676,000
Provision for losses on loans           47,907          48,000          47,972
Charge-offs                           (135,907)       (166,000)        (37,972)
                                     ---------       ---------        --------
Balance at end of year               $ 480,000         568,000         686,000
                                     =========       =========        ========
</TABLE>

(5)  Office Property and Equipment

     The cost and accumulated depreciation of office property and equipment at
December 31, 1998 and 1997, were as follows:

<TABLE>
<CAPTION>
                                             1998              1997
                                          ----------        ----------
<S>                                       <C>                  <C>
Land                                      $  312,320           312,320
Office buildings                           2,403,081         2,403,081
Furniture, fixtures, and equipment         1,390,707         1,316,437
Vehicles                                      41,905            41,905
                                          ----------        ----------
                                           4,148,013         4,073,743
Less accumulated depreciation              1,703,657         1,512,994
                                          ----------        ----------
                                          $2,444,356         2,560,749
                                          ==========        ==========
</TABLE>

(6)  Accrued Interest Receivable

     Accrued interest receivable at December 31, 1998 and 1997, is summarized as
follows:

<TABLE>
<CAPTION>
                                        1998              1997
                                     ----------        ----------
<S>                                  <C>                  <C>
Loans receivable                     $  778,481           768,460
Securities available for sale           332,444           305,645
Securities held to maturity             126,230           129,366
                                     ----------        ----------
                                     $1,237,155         1,203,471
                                     ==========        ==========
</TABLE>


                                                                     (Continued)

                                   F-52


<PAGE>   149
                    MIDWEST BANCSHARES, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements



(7)  Deposits

     Deposits at December 31, 1998 and 1997, are summarized as follows:

<TABLE>
<CAPTION>
                                     1998                1997
                                ------------        ------------
<S>                             <C>                    <C>
Passbook                        $  9,002,836           8,372,800
Noninterest checking                 579,619             649,162
Money market investments          14,797,945          14,281,692
Regular checking                   7,963,533           7,266,643
Certificates of deposit           73,638,394          74,707,995
                                ------------        ------------
                                $105,982,327         105,278,292
                                ============        ============
</TABLE>


     At December 31, 1998, the scheduled maturities of certificates of deposit
were as follows:

<TABLE>
<S>                                        <C>
               1999                        $45,460,923
               2000                         19,462,813
               2001                          6,462,205
               2002                            683,516
               2003 and thereafter           1,568,937
                                           -----------
                                           $73,638,394
                                           ===========
</TABLE>

     Interest expense on deposits for the three years ended December 31, 1998,
is summarized as follows:

<TABLE>
<CAPTION>
                                    1998              1997              1996
                                 ----------        ----------        ----------
<S>                              <C>                <C>              <C>
Passbook                         $  211,378           234,586           244,988
Money market and checking           632,695           635,551           618,377
Certificates of deposit           4,080,578         4,168,899         3,863,272
                                 ----------        ----------        ----------
                                 $4,924,651         5,039,036         4,726,637
                                 ==========        ==========        ==========
</TABLE>


     The aggregate amount certificates of deposit with a minimum denomination of
$100,000 was approximately $4,719,000 and $4,844,000 at December 31, 1998 and
1997, respectively.

     At December 31, 1998, mortgage-backed securities with carrying amounts of
$734,490 were pledged as collateral for deposits of approximately $753,000.


                                                                     (Continued)


                                        F-53

<PAGE>   150
                    MIDWEST BANCSHARES, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements


(8)  Advances from FHLB

     A summary at December 31, 1998 and 1997, follows:

<TABLE>
<CAPTION>
                                            1998                   1997
                                  ----------------------  ----------------------

                                               Weighted-               Weighted-
                                                average                 average
                                     Amount      rate       Amount       rate
                                  -----------  ---------  -----------  ---------
<S>                               <C>          <C>        <C>          <C>
Advance maturity (A):
  Within 1 year                   $ 2,000,000    6.15%    $13,000,000    5.45%
  Beyond 1 year but within
     5 years                       22,000,000    5.75      14,000,000    6.09
  Beyond 5 years                   19,000,000    5.14       2,000,000    5.62
                                  -----------             -----------
                                   43,000,000    5.50      29,000,000    5.77
Line of credit with FHLB (B)             --    Variable     1,500,000  Variable
                                  -----------  ========   -----------  ========
                                  $43,000,000             $30,500,000
                                  ===========             ===========
</TABLE>

     (A)  Advances from the FHLB are secured by stock in the FHLB. In addition,
          the Bank has agreed to maintain unencumbered additional security in
          the form of certain residential mortgage loans aggregating no less
          than 150 percent of outstanding advances.

     (B)  Line of credit with the FHLB with a limit of $1,000,000 maturing in
          March of 1999. The Bank does not intend to renew the agreement at that
          time. The line has an interest rate which fluctuates daily. During
          1998, the interest rate ranged from 4.70 percent to 6.25 percent and
          at December 31, 1998, was 4.88 percent. The line is collateralized as
          described in (A) above.


(9)  Taxes on Income

     Taxes on income for the three years ended December 31, 1998, were comprised
as follows:

<TABLE>
<CAPTION>
                          1998                                1997
            --------------------------------    --------------------------------
            Federal      State       Total      Federal      State       Total
            --------    --------    --------    --------    --------    --------
<S>         <C>         <C>         <C>         <C>         <C>         <C>
Current     $322,000      57,000     379,000     524,000      69,000     593,000
Deferred     148,000      22,000     170,000      83,000      13,000      96,000
            --------    --------    --------    --------    --------    --------
            $470,000      79,000     549,000     607,000      82,000     689,000
            ========    ========    ========    ========    ========    ========
</TABLE>

<TABLE>
<CAPTION>
                          1996
            --------------------------------
            Federal      State       Total
            --------    --------    --------
<S>         <C>         <C>         <C>
Current     $307,000      43,000     350,000
Deferred      22,000       2,000      24,000
            --------    --------    --------
            $329,000      45,000     374,000
            ========    ========    ========
</TABLE>


                                                                     (Continued)


                                   F-54

<PAGE>   151
                    MIDWEST BANCSHARES, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements



     Taxes on income differ from the amounts computed by applying the federal
income tax rate of 34 percent to earnings before taxes on income for the
following reasons:


<TABLE>
<CAPTION>
                                      1998          1997          1996
                                   ---------     ---------     ---------
<S>                                <C>             <C>         <C>
Computed "expected" tax expense    $ 653,228       664,331       341,126
State income tax                      52,140        54,120        29,903
Tax-exempt investment income        (132,460)      (11,418)         --
Other                                (23,908)      (18,033)        2,971
                                   ---------     ---------     ---------
                                   $ 549,000       689,000       374,000
                                   =========     =========     =========
</TABLE>

     The tax effects of temporary differences that give rise to significant
portions of the deferred tax assets and deferred tax liabilities as of December
31, 1998 and 1997, are presented below:

<TABLE>
<CAPTION>
                                                            1998         1997
                                                         ---------    ---------
<S>                                                      <C>          <C>
Deferred tax assets:
     General allowance for loan losses                   $ 179,000      212,000
     Accrued expenses not deducted                          15,000       72,000
                                                         ---------    ---------
           Total gross deferred tax assets                 194,000      284,000
                                                         ---------    ---------

Deferred tax liabilities:
     Unrealized gains on securities available for sale     250,000      222,000
     Office property and equipment                         195,000      167,000
     FHLB stock                                             99,000      101,000
     Tax bad debt reserve                                   86,000       32,000
                                                         ---------    ---------
           Total gross deferred tax liabilities            630,000      522,000
                                                         ---------    ---------
           Net deferred tax liability                    $(436,000)    (238,000)
                                                         =========    =========
</TABLE>

     There were no valuation allowances for deferred tax assets as of December
31, 1998 and 1997.

(10) Employee Benefit Plans

     Pension Plan

     The Company is a participant in the Financial Institutions Retirement Fund
(FIRF), and substantially all of its officers and employees are covered by the
plan. FIRF does not segregate the assets, liabilities, or costs by participating
employer. According to FIRF's administrators, as of June 30, 1998, the date of
the latest actuarial valuation, the book and market values of the fund assets
exceeded the value of vested benefits in the aggregate. In accordance with
FIRF's instructions, there wer no pension contributions in 1998, 1997, and 1996,
because the plan was fully funded.


                                                                     (Continued)

                                          F-55
<PAGE>   152
                    MIDWEST BANCSHARES, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements


     ESOP

     All employees meeting the age and service requirements are eligible to
participate in an ESOP established in September 1992. Contributions made by the
Association to the ESOP are allocated to participants by a formula based on
compensation. Participant benefits become 100 percent vested after five years of
service. At December 31, 1997 and 1996, 18,000 shares (all shares amounts have
been restated for the 1997 stock split discussed in note 11), were committed to
be released and 18,000; and 36,000 shares, respectively, were unallocated. At
December 31, 1998, the were no unallocated shares. The fair value on unearned
shares at December 31, 1997, and 1996, was approximately $324,000 and $325,500,
respectively. ESOP expense was $60,100; $56,482; and $53,938 for the years ended
December 31, 1998, 1997, and 1996, respectively.

     Stock Options

     The Company's stock option plan (the Plan) permits the board of directors
to grant options to purchase up to 136,500 shares of the Company's $.01 par
value common stock. The options may be granted to directors and officers of the
Company. The price at which options may be exercised cannot be less than the
fair market value of the shares at the date the options are granted. The options
are subject to certain vesting requirements and maximum exercise periods, as
established by the board of directors.

     The Company applies APB Opinion 25 in accounting for the Plan, and,
accordingly, no compensation expense has been recognized for its stock options
in the consolidated financial statements. Under SFAS 123, the Company determined
compensation cost based on the fair value of options granted in 1997 using the
Black-Scholes method, using a risk-free interest rate of approximately 6.64
percent, an expected life of 6 years, and historical dividend rates. The pro
forma effect of the compensation cost on 1998 and 1997 earnings per share was
approximately one cent, respectively.

     Changes in options outstanding and exercisable during 1998, 1997, and 1996
(as restated for the 1997 stock split discussed in note 11) were as follows:

<TABLE>
<CAPTION>
                                    Exercisable    Outstanding    Option price
                                      options        options        per share
                                    -----------    -----------    ------------
<S>                                 <C>            <C>            <C>
December 31, 1995                      75,075        102,375         $3.33
Vested                                 13,650             --          3.33
                                      -------        -------
December 31, 1996                      88,725        102,375          3.33
Granted                                    --         13,650          9.08
Vested                                 18,204             --       3.33 - 9.08
Exercised                             (10,205)       (10,205)         3.33
                                      -------        -------
December 31, 1997                      96,724        105,820       3.33 - 9.08
Vested                                  2,274             --          9.08
Forfeited                                  --         (4,548)         9.08
Exercised                             (59,537)       (59,537)      3.33 - 9.08
                                      -------        -------
December 31, 1998                      39,461         41,735       3.33 - 9.08
                                      =======        =======
</TABLE>


                                                                     (Continued)

                                        F-56

<PAGE>   153
                    MIDWEST BANCSHARES, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements



     Recognition and Retention Plan

     The Association has a recognition and retention plan (RRP) for certain
executive officers. The Association contributed funds to the RRP, which acquired
approximately 3 percent of shares of the common stock of the Parent Company. The
employees became fully vested in the shares of stock during 1997. RRP expense
for the year ended December 31, 1996 was $9,725; there was no RRP expense for
the years ended December 31, 1998 and 1997.

(11) Stockholders' Equity

     Stock Conversion

     At the time of the conversion from a mutual to a stock savings and loan
association, the Association established a liquidation account in an amount
equal to the regulatory capital as of December 31, 1991, to grant priority to
eligible account holders in the event of future liquidation. In the event of
such liquidation, eligible account holders who continue to maintain their
deposit accounts shall be entitled to receive a distribution from the
liquidation account. The total amount of the liquidation account will be
decreased as the balance of eligible account holders is reduced subsequent to
the conversion, based on an annual determination of such balances.

     Stock Split Effected in the Form of a Dividend

     In October 1997, the Company declared a 3-for-1 stock split effected in the
form of a 200 percent stock dividend. The dividend was paid out of treasury
shares and authorized but unissued shares, resulting in the issuance of 562,933
new shares and reissuance of 115,689 treasury shares on November 18, 1997 to
stockholders of record on November 4, 1997.

     Regulatory Capital Requirements

     The Financial Institution Reform, Recovery, and Enforcement Act of 1989
(FIRREA), and the capital regulations of the OTS promulgated thereunder, require
institutions to have a minimum regulatory tangible capital equal to 1.5 percent
of total assets; a minimum 3 percent core capital ratio; and, after December 31,
1992, a minimum 8 percent risk-based capital ratio. These capital standards set
forth in the capital regulations must generally be no less stringent than the
capital standards applicable to national banks. FIRREA also specifies the
required ratio of housing-related assets in order to qualify as a savings
institution. The Association met the regulatory capital requirements at December
31, 1998 and 1997.

     The Federal Deposit Insurance Corporation Improvement Act of 1991 (FIDICIA)
established additional capital requirements which require regulatory action
against depository institutions in one of the undercapitalized categories
defined in implementing regulations. Institutions, such as the Association,
which are defined as well capitalized, must generally have a leverage capital
(core) ratio of at least 5 percent, a tier 1 risk-based capital ratio of at
least 6 percent, and a total risk-based capital ratio of at least 10 percent.
FIDICIA also provides for increased supervision by federal regulatory agencies,
increased reporting requirements for insured depository institutions, and other
changes in the legal and regulatory environment for such institutions. The
Association met the regulatory capital requirements at December 31, 1998 and
1997.


                                                                     (Continued)

                                        F-57

<PAGE>   154
                    MIDWEST BANCSHARES, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements


     The Association's actual and required capital amounts and ratios as of
December 31, 1998, were as follows:

<TABLE>
<CAPTION>
                                                                                 TO BE WELL
                                                                                 CAPITALIZED
                                                           FOR CAPITAL          UNDER PROMPT
                                                             ADEQUACY            CORRECTIVE
                                         ACTUAL              PURPOSES         ACTION PROVISIONS
                                 ---------------------------------------------------------------
                                    AMOUNT    PERCENT     AMOUNT    PERCENT    AMOUNT    PERCENT
                                 -----------  -------   ----------  -------  ----------  -------
<S>                              <C>           <C>      <C>          <C>     <C>          <C>
Tangible capital                 $10,847,000    6.72%   $2,423,000   1.50%       n/a       n/a
Tier I leverage (core) capital    10,847,000    6.72     4,846,000   3.00    $8,076,000    5.00%
Risk-based capital                11,327,000   15.52%    5,838,000   8.00     7,298,000   10.00
Tier I risk-based capital         10,847,000   14.86%       n/a       n/a     4,379,000    6.00
                                 ===========   ======   ==========   =====   ==========   ======
</TABLE>


     At December 31, 1998 and 1997, the Association had federal income tax bad
debt reserves of approximately $2,819,000, which constitute allocations to bad
debt reserves for federal income tax purposes for which no provision for taxes
on income had been made. If such allocations are charged for other than bad debt
losses, taxable income is created to the extent of the charges. The
Association's retained earnings at December 31, 1998 and 1997, were
substantially restricted because of the effect of these tax bad debt reserves.

     Dividend Restrictions

     Federal regulations impose certain limitations on the payment of dividends
and other capital distributions by the Association. Under the regulations, a
savings institution, such as the Association, that will meet the fully phased-in
capital requirements (as defined by the OTS regulations) subsequent to a capital
distribution is generally permitted to make such capital distribution without
OTS approval, subject to certain limitations and restrictions as described in
the regulations. A savings institution with total capital in excess of current
minimum capital requirements but not in excess of the fully phased-in
requirements is permitted by the regulations to make, without OTS approval,
capital distributions of between 25 and 75 percent of its net earnings for the
previous four quarters less dividends already paid for such period. A savings
institution that fails to meet current minimum capital requirements is
prohibited from making any capital distributions without prior approval from the
OTS.

(12) Federal Deposit Insurance Corporation (FDIC) Special Assessment

     On September 30, 1996, the United States Congress passed, and the President
signed, legislation that imposed a one-time assessment of 65.7 basis points on
deposits insured by the Savings Association Insurance Fund (SAIF). Substantially
all of the deposits of the Association are SAIF-insured. The Association
incurred a one-time pre-tax expense of $670,861 that is recorded in the
Association's statement of operations for the year ended December 31, 1996.


                                                                     (Continued)

                                       F-58
<PAGE>   155
                    MIDWEST BANCSHARES, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements


(13) Fair Value of Financial Instruments

     The estimated fair values of the Company's financial instruments at
December 31, 1998 and 1997, were as follows:

<TABLE>
<CAPTION>
                               -------------------------------------------------
                                                    1998                              1997
                                        -------------------------         -------------------------
                                       Carrying            Fair            Carrying           Fair
                                        Amount             Value            Amount            Value
                                        ------             -----            ------            -----
<S>                                  <C>                <C>               <C>               <C>
Financial assets:
 Cash and cash equivalents           $  4,087,677         4,087,677         2,523,983         2,523,983
 Securities available for sale         33,842,698        33,842,698        27,934,974        27,934,974
 Securities held to maturity           21,826,889        22,116,475        19,839,678        20,055,364
 Loans receivable                      96,347,716        98,056,675        91,276,434        92,552,734
 FHLB stock                             2,200,000         2,200,000         1,959,700         1,959,700
 Accrued interest receivable            1,237,155         1,237,155         1,203,471         1,203,471
Financial liabilities:
 Deposits                             105,982,327       106,894,736       105,278,292       105,472,882
 Advances from FHLB                    43,000,000        42,632,130        30,500,000        30,376,708
 Accrued interest payable                  65,566            65,566            80,175            80,175
                                     ============       ===========       ===========       ===========
</TABLE>

<TABLE>
<CAPTION>
                                    Notional      Unrealized       Notional        Unrealized
                                     Amount       Gain (Loss)       Amount         Gain (Loss)
                                   -----------    -----------      ---------      ------------
<S>                                <C>            <C>              <C>            <C>
Off balance sheet commitments:
 Commitments to extend credit      $ 2,968,000           -         2,211,000             -
 Commitments to purchase loans         719,000           -           410,000             -
 Commitments to purchase
   investments                             -             -         1,110,000             -
                                   ===========    ==========       =========      ==========

</TABLE>


                                                                     (Continued)

                                        F-59


<PAGE>   156
                    MIDWEST BANCSHARES, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements



(14) Midwest Bancshares, Inc. (Parent Company Only) Financial Information


                            Condensed Balance Sheets
                           December 31, 1998 and 1997

<TABLE>
<CAPTION>
                                             1998               1997
                                         -----------       ------------
<S>                                      <C>               <C>
Cash and cash equivalents                $   503,789       $    236,836
Securities available for sale                386,425            823,750
Loans receivable and other                    63,001             60,965
Investment in subsidiary                  11,218,303          9,680,915
                                         -----------       ------------
        Total assets                      12,171,518         10,802,466
                                         ===========       ============

Dividends payable                        $   107,774       $     61,246
Income taxes payable
   (deferred and current)                     29,000             65,759
Stockholders' equity:
    Common stock                              10,777             10,208
    Additional paid-in capital             1,771,495          1,530,430
    Retained earnings                      9,832,094          8,821,782
    ESOP                                          --            (60,000)
    Accumulated other
       comprehensive income                  420,378            373,041
                                         -----------       ------------
        Total stockholders' equity        12,034,744         10,675,461
                                         -----------       ------------
        Total liabilities and
              stockholders' equity       $12,171,518       $ 10,802,466
                                         ===========       ============
</TABLE>


                            Condensed Statement of Operations
                      Years ended December 31, 1998, 1997, and 1996

<TABLE>
<CAPTION>
                                           1998              1997            1996
                                       -----------        ----------        --------
<S>                                    <C>                <C>               <C>
Gain on sale of securities
 available for sale                    $    64,843           220,223              --
Interest income                              3,449            11,609          16,366
Noninterest income                           9,574            15,950           7,925
Income - equity in undistributed
 earnings of subsidiary                  1,373,006         1,151,475         657,200
Noninterest expenses                       (84,385)          (76,375)        (70,469)
                                       -----------        ----------        --------
     Net earnings before income
        tax (benefit) expense            1,366,487         1,322,882         611,022
Income tax (benefit) expense                (5,771)           57,968         (18,636)
                                       -----------        ----------        --------
         Net earnings                  $ 1,372,258         1,264,914         629,658
                                       ===========        ==========        ========
</TABLE>


                                                                     (Continued)

                                        F-60

<PAGE>   157
                    MIDWEST BANCSHARES, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements


                       Condensed Statements of Cash Flows

                  Years ended December 31, 1998, 1997, and 1996


<TABLE>
<CAPTION>
                                                   1998              1997              1996
                                               -----------        ----------        ----------
<S>                                            <C>                <C>               <C>
Operating activities:
   Net earnings                                $ 1,372,258         1,264,914           629,658
   Equity in undistributed
     earnings of subsidiary                     (1,373,006)       (1,151,475)         (657,200)
   Gain on sale of investments                     (64,843)         (220,223)               --
   Other, net                                      (63,795)           28,675            (1,863)
                                               -----------        ----------        ----------
       Net cash used in operating
         activities                               (129,386)          (78,109)          (29,405)
                                               -----------        ----------        ----------
Investing activities:
   Proceeds from sale of securities                440,123           798,473                --
   Purchase of securities available
     for sale                                      (30,000)         (661,530)         (570,750)
   Decrease in loans receivable                     60,000            60,000            60,000
                                               -----------        ----------        ----------
        Net cash provided by (used
          in) investing activities                 470,123           196,943          (510,750)
                                               -----------        ----------        ----------
Financing activities:
   Dividends from subsidiary                            --           500,000         1,200,000
   Treasury stock acquired                              --          (393,659)         (511,109)
   Stock options exercised                         241,634            24,015                --
   Dividends paid                                 (315,418)         (216,785)         (191,453)
                                               -----------        ----------        ----------
        Net cash (used in) provided by
           financing activities                    (73,784)          (86,429)          497,438
                                               -----------        ----------        ----------
        Net increase (decrease) in cash
           and cash equivalents                    266,953            32,405           (42,717)
Cash and cash equivalents at beginning
   of year                                         236,836           204,431           247,148
                                               -----------        ----------        ----------
Cash and cash equivalents at end of year       $   503,789           236,836           204,431
                                               ===========        ==========        ==========
</TABLE>


(15) Contingencies

     The Company is involved with various claims and legal actions arising in
the ordinary course of business. In the opinion of management, the ultimate
disposition of these matters will not have a material adverse effect on the
Company's consolidated financial statements.

(16) Subsequent Event

     On February 2, 1999, the Company announced the execution of a definitive
merger agreement with Mahaska Investment Company. The merger will be
accomplished through a tax-free fixed exchange of one share of Mahaska
Investment Company common stock for each share of outstanding common stock of
the Company. The transaction is expected to be completed in the third quarter of
1999, after customary regulatory and shareholder approvals have been received.


                                        F-61
<PAGE>   158
                                                                         ANNEX I







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

                                    AGREEMENT

                                       AND

                                 PLAN OF MERGER


                                 BY AND BETWEEN


                           MAHASKA INVESTMENT COMPANY



                                       AND



                            MIDWEST BANCSHARES, INC.




================================================================================
<PAGE>   159

                                TABLE OF CONTENTS

<TABLE>
<S>                                                                                                              <C>
ARTICLE I                  THE MERGER.............................................................................1

       Section 1.1.        Merger and the Surviving Corporation...................................................1
       Section 1.2.        Conversion of Stock....................................................................3
       Section 1.3.        Intentionally Omitted..................................................................4
       Section 1.4.        Intentionally Omitted..................................................................5
       Section 1.5.        Adjustments for Dilution and Other Matters.............................................5
       Section 1.6.        Conversion of Dissenting Company Stock.................................................5
       Section 1.7.        Exchange Procedure.....................................................................5
       Section 1.8.        Withholding Rights.....................................................................6

ARTICLE II                 REPRESENTATIONS, WARRANTIES AND AGREEMENTS OF THE COMPANY..............................7

       Section 2.1.        Organization of the Company............................................................7
       Section 2.2.        Company Stock..........................................................................7
       Section 2.3.        Company Subsidiaries...................................................................8
       Section 2.4.        Corporate Authorization................................................................9
       Section 2.5.        Financial Statements Previously Delivered..............................................9
       Section 2.6.        Financial Statements to Be Delivered..................................................10
       Section 2.7.        Documents Other Than Financial Statements Previously Delivered........................10
       Section 2.8.        Undisclosed Liabilities...............................................................11
       Section 2.9.        Title to Properties; Leases; Violations; Environmental Matters........................11
       Section 2.10.       Governmental Regulation...............................................................13
       Section 2.11.       Litigation............................................................................15
       Section 2.12.       Taxes.................................................................................16
       Section 2.13.       Contracts.............................................................................16
       Section 2.14.       Insurance.............................................................................17
       Section 2.15.       Minute Books..........................................................................17
       Section 2.16.       Employee Benefit Plan Matters.........................................................18
       Section 2.17.       Powers of Attorney....................................................................20
       Section 2.18.       Conduct of Business Since December 31, 1997...........................................20
       Section 2.19.       Conduct of Business Pending Merger....................................................20
       Section 2.20.       Oral Commitments......................................................................22
       Section 2.21.       Loans.................................................................................22
       Section 2.22.       Derivative Transactions...............................................................23
       Section 2.23.       Fiduciary Responsibilities............................................................23
       Section 2.24        No Broker's or Finder's Fee...........................................................23
       Section 2.25.       Other Acquisition Proposals...........................................................24
       Section 2.26.       [Intentionally Omitted]...............................................................24
       Section 2.27.       Union Relations.......................................................................24
       Section 2.28.       Patents, Trademarks, Etc..............................................................24
       Section 2.29.       Takeover Laws Not Applicable..........................................................25
       Section 2.30.       Material Interests of Certain Persons.................................................25

</TABLE>






                                      -i-
<PAGE>   160
<TABLE>
       <S>                 <C>
       Section 2.31.       Disclosure; Information in the Proxy Statement/Prospectus.............................25
       Section 2.32.       Year 2000 Compliant...................................................................26
       Section 2.33.       No Company Investment in Mahaska Common Stock.........................................26
       Section 2.34.       Board Recommendation..................................................................26
       Section 2.35.       Vote Required.........................................................................26
       Section 2.36.       Shareholder Appraisal Rights..........................................................26

ARTICLE III                REPRESENTATIONS, WARRANTIES AND AGREEMENTS OF MAHASKA.................................27

       Section 3.1.        Organization of Mahaska...............................................................27
       Section 3.2.        Mahaska Stock.........................................................................27
       Section 3.3.        Corporate Authorization...............................................................28
       Section 3.4.        Financial Statements Previously Delivered.............................................28
       Section 3.5.        Governmental Regulation...............................................................29
       Section 3.6.        Disclosure; Information in the Proxy Statement/Prospectus.............................30
       Section 3.7.        No Mahaska Investment in the Company's Common Stock...................................30
       Section 3.8.        Board Recommendation..................................................................30
       Section 3.9.        Vote Required.........................................................................30
       Section 3.10.       Undisclosed Liabilities...............................................................30
       Section 3.11.       Environmental Matters.................................................................31
       Section 3.12.       Governmental Regulation...............................................................31
       Section 3.12.       Litigation............................................................................33
       Section 3.14.       Loans.................................................................................33
       Section 3.15.       Derivative Transactions...............................................................34
       Section 3.16.       Takeover Laws Not Applicable..........................................................34
       Section 3.17.       Year 2000 Compliant...................................................................34

ARTICLE IV                 ADDITIONAL AGREEMENTS.................................................................35

       Section 4.1.        Regulatory Approvals..................................................................35
       Section 4.2.        Meeting of the Company's Shareholders.................................................35
       Section 4.3.        Cooperation in Registration of Mahaska Common Stock...................................35
       Section 4.4.        Meeting of Mahaska Shareholders.......................................................36
       Section 4.5.        Registration and Listing of Mahaska Common Stock......................................36
       Section 4.6.        Cooperation in Preparation of Proxy Statement/Prospectus..............................36
       Section 4.7.        Pooling of Interests Opinion and Tax Opinion..........................................36
       Section 4.8.        Access and Information................................................................36
       Section 4.9.        Lists of Company Stockholders.........................................................37
       Section 4.10.       Continuing Effect of Representations and Warranties...................................37
       Section 4.11.       Current Information...................................................................37
       Section 4.12.       Termination Payment...................................................................38
       Section 4.13.       Reasonable Efforts....................................................................39
       Section 4.14.       Letter of Company's Accountants.......................................................39
       Section 4.15.       Letter of Mahaska's Accountants.......................................................39
       Section 4.16.       Affiliates............................................................................40
       Section 4.17.       Company Accruals and Reserves.........................................................40
</TABLE>


                                      -ii-
<PAGE>   161
<TABLE>
       <S>                 <C>
       Section 4.18.       Benefit Plans.........................................................................41
       Section 4.19.       Directors' and Officers' Indemnification Insurance....................................42
       Section 4.20.       Dividend Coordination.................................................................42
       Section 4.21.       Access and Information................................................................42
       Section 4.22.       Current Information...................................................................43

ARTICLE V                  CONDITIONS PRECEDENT TO OBLIGATIONS OF MAHASKA AND THE COMPANY........................43

       Section 5.1.        Company Stockholder Approval..........................................................43
       Section 5.2.        Regulatory Approvals and Legal Requirements...........................................43
       Section 5.3.        Securities Act Registration, Blue Sky Registration or Exemption and
                               Nasdaq Listing....................................................................43
       Section 5.4.        Pooling of Interests Opinion and Tax Opinion..........................................44

ARTICLE VI                 CONDITIONS PRECEDENT TO OBLIGATION OF MAHASKA.........................................44

       Section 6.1.        Representations, Warranties and Covenants.............................................44
       Section 6.2.        Adverse Changes.......................................................................44
       Section 6.3.        Litigation............................................................................44
       Section 6.4.        Additional Due Diligence Period.......................................................44
       Section 6.5.        Dissenting Company Stock..............................................................45
       Section 6.6.        Accountants' Letters..................................................................45
       Section 6.7.        Environmental Assessments.............................................................45
       Section 6.8.        Opinion of the Company's Counsel......................................................45
       Section 6.9.        Legal Matters.........................................................................45
       Section 6.10.       Updated Disclosure Statement..........................................................45
       Section 6.11.       Nonperformance and Materially Impaired Assets.........................................46
       Section 6.12.       Employment Agreements.................................................................46
       Section 6.13.       Affiliate Agreements..................................................................46
       Section 6.14.       Fairness Opinion......................................................................46
       Section 6.15.       Company Costs Paid....................................................................46

ARTICLE VII                CONDITIONS PRECEDENT TO OBLIGATION OF THE COMPANY.....................................46

       Section 7.1.        Representations, Warranties and Covenants.............................................46
       Section 7.2.        Opinion of Counsel to Mahaska.........................................................47
       Section 7.3.        Accountants' Letters..................................................................47
       Section 7.4.        Legal Matters.........................................................................47
       Section 7.5.        Reserved..............................................................................47
       Section 7.6.        Fairness Opinion......................................................................47
       Section 7.7.        Adverse Changes.......................................................................47
       Section 7.8.        Litigation............................................................................47

ARTICLE VIII               CLOSING...............................................................................47

       Section 8.1.        Date, Time and Place of Closing.......................................................47

</TABLE>


                                      -iii-
<PAGE>   162
<TABLE>
       <S>                 <C>
       Section 8.2.        Deliveries of Documents...............................................................48
       Section 8.3.        Merger to Be Made Effective...........................................................48

ARTICLE IX                 AMENDMENT AND TERMINATION.............................................................48

       Section 9.1.        Amendment.............................................................................48
       Section 9.2.        Termination...........................................................................48

ARTICLE X                  GENERAL PROVISIONS....................................................................50

       Section 10.1.       Survival of Representations, Warranties and Agreements................................50
       Section 10.2.       Notices...............................................................................50
       Section 10.3.       Expenses and Certain Required Accruals................................................51
       Section 10.4.       Further Assurances....................................................................51
       Section 10.5.       Publicity.............................................................................51
       Section 10.6.       Waivers...............................................................................52
       Section 10.7.       Entire Agreement and Binding Effect...................................................52
       Section 10.8.       Governing Law.........................................................................52
       Section 10.9.       Consent to Jurisdiction...............................................................52
       Section 10.10.      Counterparts..........................................................................52
       Section 10.11.      Captions..............................................................................52
</TABLE>
EXHIBITS

A      --    Delaware Certificate of Merger
B      --    Iowa Articles of Merger
C      --    Opinion of Counsel to Company
D      --    Form of Employment Agreement For Each of William D. Hassel and
               Robert D. Maschmann
E      --    Opinion of Counsel to Mahaska

                                      -iv-

<PAGE>   163
                                    AGREEMENT
                                       AND
                                 PLAN OF MERGER

     THIS AGREEMENT is made and entered into as of the 2nd day of February,
1999, by and between MAHASKA INVESTMENT COMPANY, an Iowa corporation
(hereinafter referred to as "Mahaska"), and MIDWEST BANCSHARES, INC., a Delaware
corporation (hereinafter referred to as the "Company");


                                   WITNESSETH:

     WHEREAS, Mahaska is a registered bank holding company under the Bank
Holding Company Act of 1956, as amended (hereinafter referred to as the "BHC
Act"); and

     WHEREAS, the Company is a unitary savings and loan holding company subject
to oversight by the Office of Thrift Supervision (the "OTS"); and

     WHEREAS, the respective Boards of Directors of Mahaska and the Company have
approved this Agreement providing for the merger (hereinafter referred to as the
"Merger") of the Company into Mahaska in accordance with the terms hereof, and
have determined that it is in the respective best interests of Mahaska and the
Company and their respective stockholders that the Company should merge with and
into Mahaska in accordance with the terms hereof; and

     WHEREAS, for Federal income tax purposes, it is intended that the Merger
shall qualify as a reorganization under the provisions of Section 368(a)(1)(A)
of the Internal Revenue Code of 1986, as amended (the "Code"); and

     WHEREAS, for accounting purposes, it is intended that the Merger shall
qualify for pooling of interests accounting treatment;

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


                                    ARTICLE I


                                   THE MERGER

     Section 1.1. Merger and the Surviving Corporation. (a) Subject to the terms
and conditions of this Agreement, the Company shall be merged with and into
Mahaska (which shall be the surviving corporation in the Merger) in accordance
with the Delaware General Corporation Law (the "Delaware Law") and the Iowa
Business Corporation Act (the "Iowa Act"). The Merger shall become effective
upon the filing with the respective Secretary of States of Delaware and Iowa of
a properly executed certificate of merger and articles of merger with respect
thereto in substantially the forms which are attached hereto as Exhibits A and
B, respectively, and hereby made a part hereof (hereinafter referred to
collectively as the "Certificates of Merger") or at such




<PAGE>   164



later time, if any, as may be agreed to by the parties hereto and specified in
the Certificates of Merger. The time when the Merger shall become effective is
hereinafter referred to as the "Effective Time." For purposes hereof, the term
"Constituent Corporations" shall mean Mahaska and the Company and the term
"Surviving Corporation" shall mean Mahaska as the corporation surviving in the
Merger.

     (b) At the Effective Time, by virtue of the Merger, the separate existence
of the Company shall cease and the Company shall be merged with and into Mahaska
and all the rights, privileges, powers and franchises, as well of a public as of
a private nature, of each of Mahaska and the Company and all property, real,
personal and mixed, and all debts due on whatever account, including things in
action, and all and every other interest of or belonging to or due to each of
Mahaska and the Company shall be vested in the Surviving Corporation and shall
be as effectually the property of the Surviving Corporation as they were of
Mahaska and the Company without further act or deed, and the Surviving
Corporation shall be responsible and liable for all the debts, liabilities and
duties of each of Mahaska and the Company, all with the full effect provided for
in the Delaware Law and Iowa Act. If at any time the Surviving Corporation shall
determine or be advised that any further action is necessary or desirable to
vest in the Surviving Corporation, according to the terms hereof, title to any
property or any rights of the Constituent Corporations or to carry out the
purpose of this Agreement, the last acting officers and directors of the Company
to the extent such persons are available, or the corresponding officers and
directors of the Surviving Corporation, as the case may be, shall be authorized
to take such action.

     (c) The articles of incorporation of Mahaska in effect immediately prior to
the Effective Time shall be the articles of incorporation of the Surviving
Corporation at and after the Effective Time, until amended in accordance with
the provisions thereof and with the Delaware Law and Iowa Act. The Surviving
Corporation shall be governed by the laws of the State of Iowa. At the Effective
Time, the Surviving Corporation shall be appointed to receive service of process
from the State of Delaware.

     (d) The by-laws of Mahaska in effect immediately prior to the Effective
Time shall be the by-laws of the Surviving Corporation at and after the
Effective Time, until altered, amended or repealed as provided therein and in
the certificate of incorporation of the Surviving Corporation.

     (e) The directors of Mahaska in office immediately prior to the Effective
Time together with William D. Hassel, who shall be elected by the directors of
Mahaska subject to their fiduciary duties, to fill an existing vacancy (for a
term expiring at the annual meeting of shareholders of the Surviving Corporation
in the year 2000) shall be the directors of the Surviving Corporation at and
after the Effective Time, until their successors are elected in accordance with
the by-laws of the Surviving Corporation. Subject to the fiduciary duties of the
directors of Mahaska, Mahaska shall select and nominate Mr. Hassel as a director
on its management slate of directors presented for approval to its shareholders
at its annual meeting of shareholders in the year 2000 for a term of three
years, and shall use its best efforts to cause him to be approved and elected.

         (f) The officers of Mahaska in office immediately prior to the
Effective Time shall be the officers of the Surviving Corporation at and after
the Effective Time, holding the offices in the





                                      -2-
<PAGE>   165
Surviving Corporation which they held in Mahaska immediately prior thereto,
until their successors are elected or appointed in accordance with the by-laws
of the Surviving Corporation.

     Section 1.2. Conversion of Stock. Subject to the provisions of this Article
I, at the Effective Time, by virtue of the Merger and without any action on the
part of the holders thereof, the shares of the capital stock of the Constituent
Corporations shall be converted as follows:

     (a) Each share of the Common Stock, $5.00 par value, of Mahaska which is
issued and outstanding immediately prior to the Effective Time shall, by virtue
of the Merger, remain outstanding as one share of Common Stock, $5.00 par value,
of the Surviving Corporation.

     (b) Each share of the Common Stock, $5.00 par value, of Mahaska which is
held in the treasury of Mahaska immediately prior to the Effective Time shall be
converted into one share of Common Stock, $5.00 par value, of the Surviving
Corporation held in the treasury of the Surviving Corporation.

     (c) Each share of Company Common Stock, if any, which is held in the
treasury of the Company immediately prior to the Effective Time shall be
cancelled.

     (d) Any options to acquire shares of Company Common Stock or securities
convertible into, or exchangeable for, Company Common Stock, whether or not then
exercisable shall at the Effective Time be converted into the right to acquire
shares of the Surviving Corporation under the Mahaska Investment Company 1996
Stock Incentive Plan (the "Mahaska Plan"), provided, however, to the extent that
the plan and agreements pursuant to which the options were granted are more
favorable than the "Mahaska Plan," then the more favorable provisions of those
will remain in effect. The right to receive Mahaska Common Stock upon the
exercise of any such option to acquire Company Common Stock shall have a maximum
aggregate exercise period of ten (10) years from the original granting date of
such option to acquire shares of Company Common Stock. At all times after the
Effective Time, Mahaska shall reserve for issuance such number of shares of
Mahaska Common Stock as are necessary so as to permit the exercise of options to
acquire shares of Company Common Stock in the manner contemplated herein and the
instruments pursuant to which such options were granted or issued. Mahaska shall
make all filings required under federal and state securities laws no later than
the Effective Time so as to permit the exercise of the referenced options and
for the sale of the shares received by the person making such exercise at and
after the Effective Time and Mahaska shall continue to make such filings
thereafter as may be necessary to permit the continued exercise of the
referenced options and the sale of shares received upon such exercise.

     (e) Subject to the provisions of Section 1.5 hereof, each share of Company
Common Stock issued and outstanding immediately prior to the Effective Time,
other than any shares of Dissenting Company Stock (as such term is defined in
Section 1.2(f) hereof), shall be converted into the right to receive one (1)
share of Common Stock $5.00 par value, of the Surviving Corporation (hereinafter
referred to as "Per Share Stock Consideration").

     (f) Each outstanding share of Company Common Stock as to which a written
demand for appraisal is filed in accordance with Section 262 of the Delaware
General Corporation Law at





                                      -3-
<PAGE>   166

or prior to the Company Meeting (as such term is defined in Section 4.2 hereof)
and not withdrawn at or prior to the Company Meeting and which is not voted in
favor of the Merger shall not be converted into or represent a right to receive
Mahaska Common Stock unless and until the holder thereof shall have failed to
perfect, or shall have effectively withdrawn or lost his or her right to
appraisal of and payment for his or her Company Common Stock under said Section
262 at which time his or her shares shall be converted into Mahaska Common Stock
as set forth in Section 1.2(e) hereof in accordance with Section 1.6 hereof. All
such shares of Company Common Stock as to which such a written demand for
appraisal is so filed and not withdrawn at or prior to the Company Meeting and
which are not voted in favor of the Merger, except any such shares of Company
Common Stock the holder of which, prior to the Effective Time, shall have
effectively withdrawn or lost his or her right to appraisal and payment for his
or her shares of Company Common Stock under said Section 262 of the Delaware
Law, are hereinafter referred to as "Dissenting Company Stock." The Company
shall give Mahaska prompt notice upon receipt by the Company of any written
demands for appraisal rights, withdrawal of such demands, and any other written
communications delivered to the Company pursuant to said Section 262 of the
Delaware Law, and the Company shall give Mahaska the opportunity to direct all
negotiations and proceedings with respect to such demands. The Company shall not
voluntarily make any payment with respect to any demands for appraisal rights
and shall not, except with the prior written consent of Mahaska, settle or offer
to settle any such demands. Each holder of Company Common Stock who becomes
entitled, pursuant to the provisions of said Section 262, to payment for his or
her shares of Company Common Stock under the provisions of said Section 262
shall receive payment therefor from the Surviving Corporation and such shares of
Company Common Stock shall be cancelled.

     (g) Each of the shares of capital stock of the Company held by Mahaska or
any of its wholly-owned subsidiaries or the Company or any of its wholly-owned
subsidiaries, other than shares held by Mahaska or any of its wholly-owned
subsidiaries or the Company or any of its wholly-owned subsidiaries in a
fiduciary capacity or as a result of debts previously contracted, shall be
cancelled and retired at the Effective Time and no consideration shall be issued
in exchange therefor.

     (h) At the Effective Time, the stock transfer books of the Company shall be
closed as to the holders of capital stock of the Company immediately prior to
the Effective Time and no transfer of capital stock of the Company by any such
holder shall thereafter be made or recognized. If, after the Effective Time,
certificates which represented shares of Company Common Stock immediately prior
to the Effective Time are properly presented in accordance with Section 1.7
hereof to the exchange agent, Illinois Stock Transfer Company (hereinafter
referred to as the "Exchange Agent"), such certificates shall be cancelled and
exchanged for certificates representing the number of whole shares of Mahaska
Common Stock into which the Company Common Stock represented thereby was
converted in the Merger. Any other provision of this Agreement notwithstanding,
neither Mahaska, the Company, the Surviving Corporation nor the Exchange Agent
shall be liable to a holder of Company Common Stock for any amount paid or
property delivered in good faith to a public official pursuant to any applicable
abandoned property, escheat or similar law.

     Section 1.3. Intentionally Omitted.

                                      -4-
<PAGE>   167

     Section 1.4. Intentionally Omitted.

     Section 1.5. Adjustments for Dilution and Other Matters. If at the
Effective Time the Company shall have outstanding more shares of Company Common
Stock than are contemplated to be outstanding by the representation and warranty
contained in Section 2.2 hereof after giving effect to the exercise of all
options described in Section 2.2(a)(iii), then, at Mahaska's election and
notwithstanding other provisions hereof and without limiting any of its other
rights hereunder, the Per Share Stock Consideration shall be appropriately
adjusted downward. In the event Mahaska changes (or establishes a record date
for changing) the number of shares of Mahaska Common Stock issued and
outstanding prior to the Effective Time as a result of a stock split, stock
dividend, recapitalization or similar transaction with respect to outstanding
Mahaska Common Stock and the record date thereof shall occur prior to the
Effective Time, the Per Share Stock Consideration shall be proportionately
adjusted. Such adjusted Per Share Stock Consideration shall be utilized for
adjusting the number of shares of Mahaska Common Stock that may be acquired upon
the exercise of options pursuant to Section 1.2(d) and adjusting the
corresponding exercise price per share. If such adjustment results in any holder
of Company Common Stock being entitled to a fractional share interest upon the
exchange of all of such holder's Company Common Stock of Mahaska Common Stock,
Mahaska or the Exchange Agent shall pay cash in lieu of such fractional share
interest based upon the closing price for Mahaska Common Stock on the last
trading day preceding the Effective Time.

     Section 1.6. Conversion of Dissenting Company Stock. If prior to the
Effective Time any stockholder of the Company shall fail to perfect, or shall
effectively withdraw or lose, his or her right to appraisal of and payment for
his or her shares of Dissenting Company Stock under Section 262 of the Delaware
Law, the Dissenting Company Stock of such holder shall be treated for purposes
of this Article I like any other shares of outstanding Company Common Stock. If
after the Effective Time any holder of Company Common Stock shall fail to
perfect, or shall effectively withdraw or lose, his or her right to appraisal of
and payment for his or her Dissenting Company Stock under Section 262 of the
Delaware Law, each share of Dissenting Company Stock of such holder shall be
converted into the right to receive the Per Share Stock Consideration in
accordance with the procedures and subject to the conditions, set forth in
Section 1.7 hereof.

     Section 1.7. Exchange Procedure. (a) At or prior to the Effective Time,
Mahaska shall deposit, or shall cause to be deposited, with the Exchange Agent,
for the benefit of the holders of certificates formerly representing shares of
Company Common Stock ("Old Certificates"), for exchange in accordance with this
Article I, certificates representing the shares of Mahaska Common Stock ("New
Certificates") and an estimated amount of cash (such cash and New Certificates,
together with any dividends or distributions with a record date occurring after
the Effective Time with respect thereto (without any interest on any such cash,
dividends or distributions), being hereinafter referred to as the "Exchange
Fund") to be paid pursuant to this Article I in exchange for outstanding shares
of Mahaska Common Stock.

     (b) As promptly as practicable after the Effective Time, Mahaska, shall
send or cause to be sent to each former holder of record of shares of Company
Common Stock as of immediately prior to the Effective Time transmittal materials
for use in exchanging such stockholder's Old




                                      -5-
<PAGE>   168
Certificates for the consideration set forth in this Article I. Mahaska shall
cause the New Certificates into which shares of stockholder's Company Common
Stock are converted on the Effective Time and/or any check in respect of any
fractional share interests or dividends or distribution which such person shall
be entitled to receive to be delivered to such stockholder upon delivery to and
receipt by the Exchange Agent of Old Certificates representing such shares of
Company Common Stock (or indemnity reasonably satisfactory to Mahaska and the
Exchange Agent, if any of such certificates are lost, stolen or destroyed) owned
by such stockholder. No interest will be paid on any such cash paid in lieu of
fractional share interests or in respect of dividends or distributions which any
such person shall be entitled to receive pursuant to this Article I upon such
delivery.

     (c) Notwithstanding the foregoing, neither the Exchange Agent nor any party
hereto shall be liable to any former holder of Company Common Stock for any
amount properly delivered to a public official pursuant to applicable abandoned
property, escheat or similar laws.

     (d) Until surrendered for exchange in accordance with the provisions of
this Section 1.7 hereof, each certificate theretofore representing shares of
Company Common Stock (other than shares to be cancelled pursuant to Section
1.2(f) hereof) shall from and after the Effective Time represent for all
purposes only the right to receive shares of Mahaska Common Stock as set forth
in this Agreement. No dividends or other distributions with respect to Mahaska
Common Stock with a record date occurring after the Effective Time shall be paid
to the holder of any unsurrendered Old Certificate representing shares of
Company Common Stock converted in the Merger into the right to receive shares of
such Mahaska Common Stock until the holder thereof shall be entitled to receive
New Certificates in exchange therefor in accordance with the procedures set
forth in this Section 1.7. After becoming so entitled in accordance with this
Section 1.7, the record holder thereof also shall be entitled to receive any
such dividends or other distributions, without any interest thereon, which
theretofore had become payable with respect to shares of Mahaska Common Stock
such holder had the right to receive upon surrender of the Old Certificates.

     (e) Any portion of the Exchange Fund that remains unclaimed by the
stockholders of the Company for six months after the Effective Time shall be
paid to Mahaska. Any stockholders of the Company who have not theretofore
complied with this Article I shall thereafter look only to Mahaska for payment
of the shares of Mahaska Common Stock, cash in lieu of any fractional shares and
unpaid dividends and distributions on Mahaska Common Stock deliverable in
respect of each share of Company Common Stock such stockholder holds as
determined pursuant to this Agreement, in each case, without any interest
thereon.

     Section 1.8. Withholding Rights. Mahaska or the Exchange Agent shall be
entitled to deduct and withhold from the consideration otherwise payable
pursuant to this Agreement to any holder of shares of Company Common Stock such
amounts as Mahaska or the Exchange Agent is required to deduct and withhold with
respect to the making of such payment under the Internal Revenue Code (the
"Code"), or any provision of state, local or foreign tax law. To the extent that
amounts are so withheld by Mahaska or the Exchange Agent, such withheld amounts
shall be treated for all purposes of this Agreement as having been paid to the
holder of the shares of




                                      -6-
<PAGE>   169

Company Common Stock in respect to which such deduction and withholding was made
by Mahaska or the Exchange Agent.


                                   ARTICLE II


                   REPRESENTATIONS, WARRANTIES AND AGREEMENTS
                                 OF THE COMPANY

     As an inducement to Mahaska to enter into and perform this Agreement, the
Company represents and warrants to, and agrees with, Mahaska as follows:

     Section 2.1. Organization of the Company. The Company is a corporation duly
organized, validly existing and in good standing under the laws of the State of
Delaware, with full corporate power and authority to own its property and
conduct its business and to enter into and perform this Agreement. The Company
is duly authorized to transact business in, and is in good standing under the
laws of, the State of Iowa. The character of the properties owned and leased by
the Company and the nature of the business conducted by it do not require that
the Company be qualified to do business in any other state or jurisdiction,
except where the failure to be so qualified would not have a Material Adverse
Effect upon the Company and the Company Subsidiaries. As used in this Agreement,
"Material Adverse Effect" on a party hereto means any fact, condition, event,
development or occurrence which, individually or when taken together with all
other such facts, conditions, events, developments or occurrences, could
reasonably be expected to have a material adverse effect on the financial
condition, operating results or business of (unless specifically stated
otherwise herein), such party and its subsidiaries, taken as a whole.

     Section 2.2. Company Stock. (a) The authorized capital stock of the Company
consists of 2,000,000 shares of Common, $0.01 par value (hereinafter referred to
as the "Company Common Stock"), and 500,000 shares of Preferred Stock, $0.01 par
value of which as of the date hereof (i) 1,098,523 shares of Company Common
Stock are issued and outstanding and no shares of Company Preferred Stock are
issued and outstanding, (ii) 0 shares of Company Common Stock are held in the
Company's treasury, and (iii) 20,950 options to purchase shares of Company
Common Stock are outstanding.

     (b) All of the issued and outstanding shares of Company Common Stock are
validly issued, fully paid and non-assessable, were not issued in violation of
the preemptive rights of any person, and were issued in full compliance with all
applicable state and Federal laws.

     (c) Except for the 20,950 options outstanding as set forth in Section
2.2(a)(iii), there are no outstanding warrants, options, subscriptions,
contracts, rights or other arrangements or commitments obligating the Company to
issue any additional shares of Company Common Stock or any other capital stock
of the Company, nor are there any securities, debts, obligations or rights
outstanding which are convertible into or exchangeable for Company Common Stock
or any other capital stock of the Company. There are no outstanding contracts,
rights or other arrangements or commitments which would obligate the Company to
purchase or redeem or otherwise acquire any Company Common Stock or any other
equity security.


                                      -7-
<PAGE>   170

          Section 2.3. Company Subsidiaries. (a) Other than shares of stock in
the Federal Home Loan Bank of Des Monies and marketable securities (the issuers
of which shall not be deemed Company Subsidiaries), Schedule 2.3(a) attached
hereto and hereby made a part hereof contains a list of each corporation,
including Midwest Federal Savings and Loan Association of Eastern Iowa (the
"Bank"), partnership, joint venture or other entity in which the Company has a
direct or indirect equity ownership (hereinafter each of such corporations,
partnerships and other entities is sometimes referred to individually as a
"Company Subsidiary" and collectively as the "Company Subsidiaries"), a
description of the legal nature of each Company Subsidiary, and the percentage
equity ownership of the Company or any Company Subsidiaries in each Company
Subsidiary and the legal nature of such ownership. Schedule 2.3(a) also contains
a description of the capitalization of each of the Company Subsidiaries
(including, without limitation, a listing of the authorized, issued and
outstanding shares of capital stock of each Company Subsidiary).

         (b) Except as disclosed in Schedule 2.3(b) attached hereto and hereby
made a part hereof, all of the capital stock of each Company Subsidiary is owned
of record and beneficially by the Company or another Company Subsidiary.

          (c) Each of the Company Subsidiaries which is a financial institution
is duly organized, and validly existing as an Iowa banking corporation or
savings association under the laws of the State of Iowa or, if a national bank,
or federal thrift or savings association, as a national banking, thrift or
savings association under the laws of the United States. Each of the Company
Subsidiaries which is not a financial institution is duly organized, validly
existing and in good standing under the laws of its state of incorporation. All
of the Company Subsidiaries have full corporate power and authority to own or
lease their properties and carry on their businesses as now being conducted, and
each is qualified to do business as a foreign corporation in each state where
the character and location of its properties or the nature of the business
conducted by it requires qualification. All necessary regulatory approvals for
the acquisition and ownership by the Company of the capital stock of each of the
Company Subsidiaries have been received by the Company. Each of the Company
Subsidiaries has all consents, permits, franchises, licenses, concessions,
authorities (including without limitation all easements, rights of way and
similar authorities), authorizations and approvals of Federal, state and local
governmental authorities and other persons and entities required in connection
with the ownership and operation of its properties and the carrying on of its
business as now being conducted, all of which are in full force and effect and
no suspension or cancellation of any of which is threatened, except for those
whose failure to obtain or maintain would not have a Material Adverse Effect on
the Company, the Bank or the Surviving Corporation, other than consents,
authorizations and approvals required relating to the transactions contemplated
by this Agreement.

         (d) All shares of the issued and outstanding capital stock of each of
the Company Subsidiaries are validly issued, fully paid and non-assessable, were
not issued in violation of the preemptive rights of any person, and were issued
in full compliance with all applicable state and Federal laws.

         (e) There are no outstanding warrants, options, subscriptions,
contracts, rights or other arrangements or commitments obligating any Company
Subsidiary to issue any additional shares of its capital stock, nor are there
any securities, debts, obligations or rights outstanding which are



                                      -8-
<PAGE>   171


convertible into or exchangeable for shares of its capital stock. There are not
outstanding contracts, rights or other arrangements or commitments which would
obligate any Company Subsidiary to purchase or redeem or otherwise acquire any
shares of its capital stock or any other security.

         Section 2.4. Corporate Authorization. The execution, delivery and
performance of this Agreement and the related documents have been duly and
validly authorized and approved by the Board of Directors of the Company and,
except as disclosed on Schedule 2.4 and for results and consequences that are
not expected to have a Material Adverse Effect on the Company or the Bank, do
not and will not violate or conflict with the certificate of incorporation or
by-laws of the Company and do not and will not violate or conflict with or
result in any material default, any acceleration of required performance or any
loss of a material benefit under any note, bond, mortgage, indenture, lease,
franchise, license, permit, approval, contract, agreement or other instrument or
document or any order, writ, injunction, decree, judgment, statute, rule or
regulation to which the Company or any Company Subsidiary is a party or subject
or by which the Company or any Company Subsidiary is bound. No consent of any
third party (other than the regulatory approvals referred to in Section 4.1
hereof and the shareholders approval referred to in Section 4.2 hereof) is
necessary to enable the Company to consummate the transactions contemplated by
this Agreement. The requisite vote of the shareholders of the Company to adopt
this Agreement, as required by applicable law, is a vote in favor of such
adoption by the holders of not less than a majority of the outstanding stock of
the Company entitled to vote thereon, voting as a single class.

          Section 2.5. Financial Statements Previously Delivered. (a) The
Company has furnished Mahaska with copies of the following financial statements:

                   (i) Audited consolidated balance sheets of the Company and
         the Company Subsidiaries as of December 31, 1995, 1996 and 1997, and
         the related audited consolidated statements of income, changes in
         shareholders' equity and cash flows for each of the calendars years
         ended December 31, 1995, 1996 and 1997, together with the notes
         thereto, accompanied by the unqualified reports thereon of KPMG Peat
         Marwick, LLP, certified public accountants;

                  (ii) An unaudited consolidated balance sheet of the Company
         and the Company Subsidiaries as of September 30, 1998, together with a
         related consolidated statement of income for the three-month period
         then ended; and

                 (iii) Reports of condition of each of the Company Subsidiaries
         which is a financial institution as of December 31, 1995, 1996 and
         1997, together with the related reports of income for the periods then
         ended, as included in the thrift financial reports of each of the
         Company Subsidiaries which is a financial institution as of said dates
         filed with any bank regulatory authority.

         (b) Each of the financial statements referred to in clauses (i) and
(ii) of paragraph (a) of this Section has been prepared in accordance with
generally accepted accounting principles and practices consistently applied
(except for the absence of footnotes and year end adjustments in the



                                      -9-
<PAGE>   172

case of the unaudited financial statements as of and for the period ended
September 30, 1998). Each of the financial statements referred to in clause
(iii) of paragraph (a) of this Section has been prepared in accordance with the
applicable regulations and standards of the bank regulatory authority with which
said financial statement was filed. Each of the financial statements referred to
in paragraph (a) of this Section is true, correct and complete in all material
respects and presents fairly the financial condition of the Company and the
Company Subsidiaries on a consolidated basis, or, as the case may be, the
financial condition of a Company Subsidiary, as of the date thereof or, as the
case may be, the results of operations (on a consolidated basis, if applicable)
for the period covered thereby.

          Section 2.6. Financial Statements to Be Delivered. (a) As soon as
available, the Company will furnish Mahaska with copies of the following
financial statements:

          (i) All financial statements of the Company or any Company Subsidiary
as of any date, or for any period ending, after December 31, 1997, which shall
be issued or distributed to shareholders, directors or management of the Company
or any Company Subsidiary prior to the Effective Time; and

          (ii) Each thrift financial report of each Company Subsidiary which is
a financial institution filed prior to the Effective Time with any regulatory
authority for any period ending after December 31, 1997.

          (b) With respect to the financial statements furnished pursuant to
clause (i) of paragraph (a) of this Section, each of them will have been
prepared in accordance with generally accepted accounting principles and
practices consistently applied (except for the absence of footnotes and year end
adjustments in the case of unaudited financial statements). With respect to the
financial statements contained in the thrift financial reports furnished
pursuant to clause (ii) of paragraph (a) of this Section, each of them will have
been prepared in accordance with the applicable regulations and standards of the
regulatory authority with which said financial statements were filed. With
respect to all financial statements furnished pursuant to paragraph (a) of this
Section, each of them will be true, correct and complete in all material
respects and will fairly present the financial condition of the Company and the
Company Subsidiaries on a consolidated basis, or, as the case may be, the
financial condition of a Company Subsidiary, as of the date thereof or, as the
case may be, the results of operations (on a consolidated basis, if applicable)
for the period covered thereby.

          Section 2.7. Documents Other Than Financial Statements Previously
Delivered. The Company has, as part of the disclosure documents and information
previously furnished by the Company to Mahaska (the "Disclosure Statement"),
furnished Mahaska with true, correct and complete copies of the following
documents:

          (a)       The certificate of incorporation and by-laws of the Company;

          (b)       The certificate of incorporation, articles of incorporation,
charter or articles of association, as the case may be, and by-laws of each
Company Subsidiary;



                                      -10-
<PAGE>   173

          (c) All proxy statements, annual reports and other written materials
furnished to the stockholders of the Company and the Company Subsidiaries since
January 1, 1994; and

          (d) Each contract, agreement, instrument, lease, license, plan,
arrangement and other document in which the Company or any Company Subsidiary is
obligated to pay in a one year period in excess of Twenty-Five Thousand Dollars
($25,000.00) to which the Company or any Company Subsidiary is a party or
subject and which is described or referred to in the Disclosure Statement.

          Section 2.8. Undisclosed Liabilities. All of the obligations or
liabilities (whether accrued, absolute, contingent, unliquidated or otherwise,
whether due or to become due, and regardless of when asserted) arising out of
transactions or events heretofore entered into, or any action or inaction,
including taxes with respect to or based upon transactions or events heretofore
occurring, that are required to be reflected, disclosed or reserved against in
audited consolidated financial statements in accordance with generally accepted
accounting principles ("Liabilities") have, in the case of the Company and the
Company Subsidiaries, been so reflected, disclosed or reserved against in the
Company's audited financial statements as of December 31, 1997 or in the notes
thereto (the "1997 Balance Sheet"), and the Company and the Company Subsidiaries
have no other Liabilities except (a) Liabilities incurred since December 31,
1997 in the ordinary course of business or (b) as disclosed on Schedule 2.8.

          Section 2.9. Title to Properties; Leases; Violations; Environmental
Matters. (a) Without limiting any other provision of this Agreement, each of the
Company and the Company Subsidiaries is the owner of good and marketable title
to all real property and good title to all other property and assets, tangible
and intangible, which it claims or otherwise purports to own (including, without
limitation, all of its assets reflected on the 1997 Balance Sheet or purported
to have been acquired by it since the date thereof), free and clear of any
mortgages, liens, pledges, security interests, licenses, charges, restrictions
on transfer or other encumbrances, except for (i) in the case of the Company
Subsidiaries which are financial institutions, pledges and liens given to secure
deposits and other banking liabilities arising in the ordinary course of
business, (ii) liens for current taxes not yet due and payable, (iii)
properties, interests and assets sold or otherwise disposed of after December
31, 1997, in the ordinary course of business, and (iv) as to real estate,
imperfections of title and easements and encumbrances, if any, that do not
materially detract from the value of the respective assets subject thereto or
interfere with the current use thereof and that do not materially impair the
operations of the Company or any of the Company Subsidiaries as currently
conducted. Except as disclosed on Schedule 2.9 hereto, there is no property or
assets, tangible or intangible, real, personal or mixed (for which the Company
is obligated to pay in excess of five thousand dollars per year for each such
personal or intangible property or asset or in excess of $25,000 per year for
each such real property), which are used by the Company or any Company
Subsidiaries in the conduct of their business which are not owned by the Company
or the Company Subsidiaries, free and clear of any mortgages, liens, pledges,
security interests, licenses, charges, restrictions on transfer or other
encumbrances.

          (b) Each lease under which the Company or any Company Subsidiary is
the lessee of any real or personal property is in full force and effect, and the
lessee under each such lease has been in peaceable possession of the property
covered thereby since the commencement of the original




                                      -11-
<PAGE>   174

term of such lease. No waiver, indulgence or postponement of the lessee's
obligations under any such lease has been granted by the lessor thereunder, or
of such lessor's obligations thereunder by such lessee. Neither the lessee nor,
to the best of the Company's knowledge and belief, the lessor under each such
lease has violated in any material respect any of the terms or conditions
thereof, and all of the covenants to be performed by the lessee and, to the best
of the Company's knowledge and belief, the lessor under each such lease have
been fully performed in all material respects.

          (c) During the last five years, neither the Company nor any Company
Subsidiary has received notice of any violation of any applicable zoning
regulation, ordinance or other law, order, regulation or requirement relating to
its operations or property; to the knowledge of the Company, no such violation
presently exists; and, to the knowledge of the Company, all buildings and other
structures owned, leased, occupied, operated or used by the Company and the
Company Subsidiaries conform to all applicable ordinances, codes and
regulations.

          (d) Except as disclosed on Schedule 2.9(d), no Hazardous Materials (as
such term is hereinafter defined) have been located in or on any of the real
property owned or used by the Company or any Company Subsidiaries (hereinafter
referred to collectively as the "Company Real Property") or have been released
into the environment, or discharged, emitted, placed or disposed of at, on,
under or by the Company Real Property, and the Company Real Property and the
operations of the Company and the Company Subsidiaries thereon have complied in
all respects with any applicable Environmental Laws (as such term is hereinafter
defined), and any applicable law, regulation or requirement relating to
environmental and occupational health and safety matters and Hazardous
Materials. None of the Company Real Property is a facility at which there has
been a release of Hazardous Materials that exceeds or violates any applicable or
relevant and appropriate Environmental Laws. Except as disclosed in the
Disclosure Statement, there exist no underground storage tanks, landfills, or
land disposal or dumps on the Company Real Property. None of the Company Real
Property is discharging oil or poses a substantial threat of a discharge of oil,
within the meaning of the Oil Pollution Act of 1990. As used herein, the term
"Hazardous Materials" shall mean any substance or material which is regulated by
any local governmental authority, the State of Iowa or the United States
Government, as an environmental pollutant or dangerous to public health, public
welfare or the natural environment (including, without limitation, protection of
non-human forms of life, land, surface water, groundwater and air) including,
but not limited to, any material or substance which is (i) defined as "toxic,"
"polluting," "hazardous waste," "hazardous material," "hazardous substance,"
extremely hazardous waste" or "restricted hazardous waste" under any provision
of local, State of Iowa or Federal law; (ii) petroleum; (iii) asbestos; (iv)
polychlorinated biphenyls; (v) radioactive material; (vi) designated as a
"hazardous substance" pursuant to the Clean Water Act, 33 U.S.C. ss.1321; (vii)
defined or designated as a "hazardous waste" pursuant to the Resource
Conservation and Recovery Act, 42 U.S.C. ss.6901 et seq. (42 U.S.C. ss.6903);
(viii) defined or designated as a "hazardous substance" pursuant to the
Comprehensive Environmental Response, Compensation, and Liability Act, 42 U.S.C.
ss.9601 et seq. (42 U.S.C. ss.9601) (hereinafter referred to as "CERCLA"); (ix)
defined or designated as a chemical substance under the Toxic Substances Control
Act, 15 U.S.C. ss.2601 et seq.; (x) defined or designated as a pesticide under
the Federal Insecticide, Fungicide and Rodenticide Act, 7 U.S.C. ss.135 et seq.;
or (xi) crude oil or any fraction thereof or oil. As used herein, the term
"Environmental Laws" shall mean all statutes specifically




                                      -12-
<PAGE>   175

described in the foregoing sentence and all Federal, state and local
environmental health and safety statutes, ordinances, codes, rules, regulations,
orders, decrees and guidance documents regulating, relating to or imposing
liability or standards concerning or in connection with Hazardous Materials.

          (e) Except as disclosed on the Schedule 2.9(e) hereto no real property
occupied, owned, operated, leased or used by the Company or any Company
Subsidiary, or in which any Company Subsidiary holds a beneficial interest,
whether as owner, mortgagee or otherwise, including (without limitation) as a
holder of a collateral assignment of a beneficial interest in a land trust,
constitutes a hazardous substance disposal site listed pursuant to Section
455B.426 of the Iowa Code, the use or transfer of which is restricted under
Section 455B.430 of the Iowa Code.

          (f) Prior to the Effective Time, the Company will furnish to Mahaska,
at the sole cost and expense of Mahaska a written report, addressed to Mahaska,
of an environmental assessment of four (4) identified parcels of real property
occupied and owned by the Company or the Bank which Mahaska may designate,
prepared by an engineering firm or other qualified expert satisfactory to
Mahaska in a manner consistent with generally accepted engineering practices and
procedures and dated as of a date not more than 60 days prior to the day of the
Effective Time (hereinafter referred to as the "Environmental Assessments").
Each Environmental Assessment shall demonstrate that (i) appropriate inquiry was
made into the previous ownership and uses of such parcel, consistent with good
commercial and customary practice in an effort to minimize liability, which
takes into account the "innocent landowner" provision of CERCLA, and (ii) the
parcels it covers and all improvements thereon do not contain asbestos, urea
formaldehyde foam insulation, transformers or other equipment which contain
dielectric fluid containing levels of polychlorinated biphenyls in excess of 50
parts per million, or any other chemical, material or substance, exposure to
which is prohibited, limited or regulated by any governmental authority which,
in Mahaska's reasonable judgement, requires remediation and/or cleanup that may
have a total cost in excess of two hundred fifty thousand dollars ($250,000).

          (g) With respect to the four (4) parcels identified in Section 2.09(f)
hereinabove, (a) except as disclosed on Schedule 2.9(g) hereto, such parcels and
all improvements thereon are not now being used, and, to the knowledge of the
Company, have never been used, for any activity involving, directly or
indirectly, the use, generation, treatment, storage or disposal of any Hazardous
Substances, (b) such parcels and the improvements, if any, thereon, are not,
and, to the knowledge of the Company, have not been, the subject of any past,
existing or threatened investigation, proceeding or inquiry concerning
environmental matters, (c) except as disclosed on Schedule 2.9(g) hereto, no
notice or submission concerning environmental matters has been during the period
owned or occupied by the Company or a Company Subsidiary (limited to the past
twenty (20) years), or to the knowledge of the Company, should be, given with
respect to such parcels or any improvement thereon, and (d) neither the Company
nor any Company Subsidiary is subject to, or covered by, the requirements of
Title III of the Superfund Amendments and Reauthorization Act of 1986, as
amended.

          Section 2.10. Governmental Regulation. (a) Each of the Company and the
Company Subsidiaries holds all consents, licenses, certificates, permits,
authorizations, approvals, franchises and rights of Federal, state, local and
other public authorities and other persons and entities


                                      -13-
<PAGE>   176

required in connection with the ownership and operation of its properties and
the carrying on of its business as now being conducted, all of which are now in
full force and effect, and between the date hereof and the Effective Time, the
Company will use its best efforts to, and will cause each Company Subsidiary to
use its best efforts to, maintain all such consents, licenses, certificates,
permits, authorizations, approvals, franchises and rights in full force and
effect. The Company shall promptly notify Mahaska of the loss or threat of loss
of any such consent, license, certificate, permit, authorization, approval,
franchise or right. Neither the Company nor any Company Subsidiary which is a
financial institution is a party or subject to any agreement with, or directive
or order issued by, the Board of Governors of the Federal Reserve System (the
"FRB"), the Federal Deposit Insurance Corporation (the "FDIC"), the Comptroller
of the Currency, the Office of Thrift Supervision (the "OTS"), the
Superintendent of Banking of the State of Iowa Division of Banking (the
"Superintendent") or any other regulatory authority, which imposes any
restrictions or requirements not applicable generally to savings and loan
holding companies (in the case of the Company) or financial institutions (in the
case of the Company Subsidiaries which are financial institutions), with respect
to the conduct of its business. Each of the Company and the Company Subsidiaries
has conducted its business so as to comply in all material respects with all
applicable Federal, state and local statutes, regulations, ordinances and rules,
including (without limitation) applicable banking laws, Federal and state
securities laws, and laws and regulations concerning minimum capital
requirements, truth-in-lending, usury, fair credit reporting, fair lending and
equal credit opportunity, currency reporting, community reinvestment, Internal
Revenue Service information reporting and back-up withholding, consumer
protection, occupational safety, employee benefit plans, environmental matters,
fair employment practices and fair labor standards. Except as disclosed on
Schedule 2.10 hereto, since December 31, 1994, neither the Company nor any of
the Company Subsidiaries has received from any governmental or regulatory
authority any written requirement, recommendation or suggestion of a material
nature concerning their capital structure, loan policies or portfolio, or other
banking or business practices or procedures that has not been resolved to the
reasonable satisfaction of such regulatory authority.

         (b) The Company is duly registered as a savings and loan holding
company subject to oversight by the OTS. The Company is not a bank holding
company subject to the "Bank Holding Company Act of 1956".

         (c) The Company and each Company Subsidiary which is a financial
institution are in full compliance with applicable minimum capital requirements
prescribed by the OTS and any other regulatory authority having regulatory
jurisdiction over the Company or such Company Subsidiary, as the case may be,
and each such Company Subsidiary is "adequately capitalized" or "well
capitalized" within the meanings of such terms as used in Section 38(b) of the
Federal Deposit Insurance Act, as amended (the "FDI Act"), and the applicable
regulations promulgated thereunder.

         (d) Except as set forth on Schedule 2.10(d), the deposits of each
Company Subsidiary which is a financial institution are insured by the FDIC in
accordance with the FDI Act and the rules and regulations of the FDIC adopted
thereunder.



                                      -14-
<PAGE>   177

         (e) As part of the Disclosure Statement, the Company has previously
furnished to Mahaska copies of (i) the Company's Annual Reports on Form 10-KSB
and Quarterly Reports on Form 10-QSB since December 31, 1994, in each case as
filed with the Securities and Exchange Commission (hereinafter referred to as
the "SEC"), (ii) each proxy statement relating to any meeting of the Company's
shareholders (whether annual or special) which has been held since December 31,
1994, (iii) the annual reports to the Company's shareholders and quarterly
reports to the Company's shareholders since December 31, 1994, (iv) the
Company's annual reports on Form Hb-11 and quarterly updates, if any, since
December 31, 1994, each as filed with the OTS, (v) each thrift financial report
of condition and income filed by the Company and each Company Subsidiary with
any supervisory authority since December 31, 1994, (vi) all other reports or
registration statements filed by the Company or any Company Subsidiary with the
SEC or the OTS since December 31, 1994, and (vii) all other documents
incorporated by reference in whole or in part in the foregoing (the documents
referred to in (i) through (vii), including all amendments and supplements
thereto and all financial statements and notes contained therein, are
hereinafter collectively referred to as the "Reports"). The Reports, as of the
respective times of filing thereof with the SEC, the OTS or any other regulatory
authority, as the case may be, complied as to form and substance with all
material requirements of the laws, rules and regulations applicable thereto and
did not include any untrue or misleading statement of or with respect to a
material fact or omit to state any material fact necessary in order to make the
statements made therein, in the light of the circumstances under which they were
made, not misleading. Since December 31, 1994, the Company and each of the
Company Subsidiaries have filed all reports and registration statements required
to be filed by each of them with the SEC, the OTS or any other regulatory
authority in accordance with all material requirements of the laws, rules and
regulations applicable thereto except where the failure to so file such reports
and registration statements will not have a material effect on the Company, the
Surviving Corporation or any Company Subsidiary. From and after the date hereof
until the Effective Time, concurrently with the filing thereof with any
regulatory agency or the mailing thereof to the shareholders of the Company, as
the case may be, the Company will deliver to Mahaska copies of any of the
Reports not previously filed or mailed as aforesaid prior to the date hereof.

         (f) The Company Common Stock is duly registered under Section 12(g) of
the Securities Exchange Act of 1934, as amended (hereinafter referred to as the
"Exchange Act"). The Company has previously furnished, or will promptly furnish
upon receipt, to Mahaska copies of any Statements on Schedule 13D, 13G, 14B or
14D-1 and Forms 3, 4 and 5 under the Exchange Act and any amendments to any such
statements or forms received by the Company or known by it to have been filed
with the SEC with respect to the ownership of, or solicitation of proxies in
connection with, any of the Company Common Stock.

        Section 2.11. Litigation. Except as disclosed on Schedule 2.11 hereto,
there are no legal, arbitration, quasi-judicial or administrative proceedings of
any kind or nature pending or, to the best of the Company's knowledge and
belief, threatened, affecting or involving the Company or any of the Company
Subsidiaries or any of their respective properties or any of the Company Stock
or the capital stock of any of the Company Subsidiaries, which may have a
Material Adverse Effect on the Company, the Surviving Corporation or the Bank,
and there has been no material default on the part of the Company or any of the
Company Subsidiaries with respect to any judgment, order, writ, injunction,
decree, award, rule or regulation issued in any legal, quasi-




                                      -15-
<PAGE>   178
judicial or administrative proceeding. Schedule 2.11 hereto sets forth a
description of all material litigation, arbitration or quasi-judicial or
administrative proceedings to which the Company or any Company Subsidiary was a
party at any time since December 31, 1994.

        Section 2.12. Taxes. Each of the Company and the Company Subsidiaries
has timely filed, either separately or as a member of a consolidated group of
corporations, with appropriate Federal, state, county and local governmental
agencies, all tax returns and reports required to be filed, and each such return
and report is complete and accurate in all material respects. Each of the
Company and the Company Subsidiaries has paid, or has set up an adequate reserve
for the payment of, all taxes and assessments of every kind and description
whatsoever (including, without limitation, interest and penalties) shown as
owing on such returns and reports or otherwise due and owing by it. Proper and
accurate amounts have been withheld for the payment of taxes by the Company and
the Company Subsidiaries from the compensation payable to their respective
employees for all periods ending prior to the date hereof in full compliance
with the tax withholding provisions of all laws applicable to the Company and
the Company Subsidiaries. There are included in the 1997 Balance Sheet adequate
reserves in accordance with GAAP, for the payment of all Federal, state, county
and local taxes of the Company and the Company Subsidiaries, including (without
limitation) interest and penalties (if any), whether or not disputed, which were
accrued but unpaid through the date thereof. On the date of this Agreement and
at all times during the period between such date and the Effective Time, there
are, and will be, established on the books of the Company and the Company
Subsidiaries adequate reserves in accordance with generally accepted accounting
principles, for the payment of all such Federal, state, county and local taxes,
including interest and penalties (if any), whether or not disputed, which are
from time to time accrued but unpaid. Neither the Company nor any of the Company
Subsidiaries has executed or filed with the Internal Revenue Service or any
other governmental agency any agreement extending or waiving the period for
assessment or collection of any tax, nor is the Company or any of the Company
Subsidiaries a party to any action or proceeding by any governmental agency for
assessment or collection of taxes, nor is there any claim for assessment or
collection of taxes pending against the Company or any of the Company
Subsidiaries. Neither the Company nor any of the Company Subsidiaries has during
the past ten years received any notice of deficiency, proposed deficiency or
assessment from the Internal Revenue Service or any other governmental agency
with respect to any Federal, state, county or local taxes. No Federal, state,
county or local income tax return of the Company or any of the Company
Subsidiaries is currently the subject of any audit by the Internal Revenue
Service or any other governmental agency; no material deficiencies were asserted
as a result of any past examinations of income tax returns which have not been
resolved and fully paid. Except as set forth on Schedule 2.12 hereto, neither
the Company nor any of the Company Subsidiaries is a party to any agreement
providing for allocation or sharing of any taxes.

        Section 2.13. Contracts. (a) Except as disclosed on Schedule 2.13
hereto, neither the Company nor any of the Company Subsidiaries is a party to,
subject to or bound by any (i) employment contract (including, without
limitation, any collective bargaining contract or union agreement) which is not
terminable by it without penalty or other liability upon 30 or fewer days'
notice; (ii) employee stock option, bonus, deferred compensation, savings,
profit sharing, severance pay, pension, retirement or group insurance plan or
arrangement or other similar agreement, plan or arrangement; (iii) lease or
license which requires an annual payment by the



                                      -16-
<PAGE>   179
Company or any Company Subsidiary in excess of Twenty-Five Thousand Dollars
($25,000) with respect to any property, real or personal, whether as landlord,
tenant, licensor or licensee; (iv) agreement, contract, instrument or indenture
relating to the borrowing of money; (v) guaranty of any obligation for borrowed
money or otherwise, excluding (in the case of the Company Subsidiaries which are
financial institutions) endorsements made for collection and guarantees made in
the ordinary course of business; (vi) management or consulting agreement or
other similar agreement or arrangement; (vii) agreement with any present or
former officer, director or shareholder of the Company or any Company
Subsidiary; or (viii) other contract, agreement or commitment, other than this
Agreement, which is material to its business, operations, property, prospects or
assets or to its condition, financial or otherwise, or which involves payments
by or to it of more than a total of $50,000.00 in any one-year period, except
(in the case of the Company Subsidiaries which are financial institutions) for
deposit accounts and loan agreements between such Company Subsidiary and third
parties involving commitments on the part of such Company Subsidiary to lend
money in customary amounts in the ordinary course of such Company Subsidiary's
business and letters of credit in customary amounts issued by a Company
Subsidiary which is a financial institution to third parties in the ordinary
course of such Company Subsidiary's business. Between the date hereof and the
Effective Time, except in the ordinary course of business, without the prior
written consent of Mahaska, the Company will not, and will cause the Company
Subsidiaries not to, enter into or amend any contract, agreement, commitment,
plan, arrangement or other instrument of any of the types referred to in clauses
(i) through (viii) of this paragraph.

         (b) Each of the Company and the Company Subsidiaries has performed all
material obligations heretofore required to be performed by it and is not in
material default under, and, to the best of the Company's knowledge and belief,
no event has occurred which, with the lapse of time or action by a third party
(other than the consummation of the transactions contemplated by this
Agreement), could result in a material default by the Company or any Company
Subsidiary under, any outstanding indenture, mortgage, deed of trust, contract,
agreement, lease, license, instrument or other arrangement to which it is a
party or subject or by which it is bound or under any provision of its
certificate of incorporation, articles of incorporation, charter or articles of
association, as the case may be, or by-laws.

         Section 2.14. Insurance. Each of the Company and the Company
Subsidiaries has in effect the insurance coverage described on Schedule 2.14
hereto, which description contains the amount and types of coverage and the
risks insured, and such coverage is with reputable insurers, insures against all
risks normally insured against by thrift holding companies and thrift
institutions, and is adequate (in amounts, types and risks insured) for the
business conducted by it. All of the insurance policies referred to on Schedule
2.14 hereto are in full force and effect, neither the Company nor any of the
Company Subsidiaries is in material default under any of such policies, and all
material claims under such policies have been filed in due and timely fashion,
except where the failure to file any such claim in a due and timely fashion
would not have a material adverse effect on such claim.

        Section 2.15. Minute Books. The minute books of the Company and the
Company Subsidiaries contain complete and accurate records, in all material
respects, of all meetings and other corporate actions of their respective
stockholders and directors.



                                      -17-
<PAGE>   180

          Section 2.16. Employee Benefit Plan Matters. (a) Except as set forth
on Schedule 2.16 hereto, neither the Company nor any Company Subsidiary is a
party to or participates in or has any material liability or contingent
liability with respect to:

                   (i) Any "employee welfare benefit plan" or "employee pension
         benefit plan" (as those terms are defined in Sections 3(1) and 3(2) of
         the Employee Retirement Income Security Act of 1974, as amended
         (hereinafter referred to as "ERISA")), including any "multiemployer
         plan" as defined in Section 3(37) of ERISA); or

                  (ii) Any retirement or deferred compensation plan, incentive
         compensation plan, stock option plan, stock plan, stock appreciation
         rights plan, phantom stock plan, unemployment compensation plan,
         vacation pay, severance pay, bonus or benefit arrangement, insurance or
         hospitalization program or any other fringe benefit arrangements
         (hereinafter referred to collectively as "fringe benefit arrangements")
         for any employee, officer, director, consultant or agent, whether
         pursuant to contract, arrangement, custom or informal understanding,
         which does not constitute an "employee benefit plan" (as defined in
         Section 3(3) of ERISA).

         (b) A true and correct copy of each of the plans, arrangements and
agreements listed on Schedule 2.16(b) hereto, and all contracts relating
thereto, or to the funding thereof, including, without limitation, all trust
agreements, insurance contracts, investment management agreements, subscription
and participation agreements and record keeping agreements, each as in effect on
the date hereof, has been delivered to Mahaska by the Company as part of the
Disclosure Statement. In the case of any plan, arrangement or agreement which is
not in written form, the Company has provided Mahaska with an accurate written
description of such plan, arrangement or agreement as in effect on the date
hereof. A true and correct copy of the most recent annual report, actuarial
report, summary plan description and Internal Revenue Service determination
letter with respect to each such plan or arrangement, to the extent applicable,
and a current schedule of assets (and the fair market value thereof assuming
liquidation of any asset which is not readily tradable) held with respect to any
funded plan arrangement or agreement has been provided to Mahaska by the
Company, and there have been no material adverse changes in the financial
condition of the respective plans from that stated in the annual reports and
actuarial reports supplied.

         (c) As to all plans, arrangements and agreements listed on Schedule
2.16(b) hereto:

                   (i) All employee benefit plans and fringe benefit
         arrangements comply with, and have been administered in form and in
         operation, in all material respects, in compliance with, all
         requirements of law and regulation applicable thereto, except as set
         forth on Schedule 2.16(b) hereto, and neither the Company nor any
         Company Subsidiary has received any notice from any governmental agency
         questioning or challenging such compliance.

                  (ii) All employee pension benefit plans comply in form and in
         operation with all applicable requirements of Sections 401(a) and
         501(a) of the Code, except where such non-compliance would not result
         in material liability to such plans, the Company, the Surviving
         Corporation or any Company Subsidiary; there have been no amendments to





                                      -18-
<PAGE>   181

         such plans which are not the subject of a determination letter issued
         with respect thereto by the Internal Revenue Service and which would
         adversely affect the tax qualified status of any such plan; and no
         event has occurred which will or could give rise to disqualification of
         any such plan under such Sections or to a material tax liability under
         Section 511 of the Code.

                 (iii) Except as set forth on Schedule 2.16(c)(iii) hereto, none
         of the assets of any employee benefit plan are invested in employer
         securities or employer real property and no such plan has borrowed any
         sum which has not been repaid in full.

                 (iv)  There have been no "prohibited transactions" (as
         described in Section 406 of ERISA or Section 4975 of the Code) with
         respect to any employee benefit plan maintained by either the Company
         or any Company Subsidiary and for which the Company, the Surviving
         Corporation or any Company Subsidiary could be liable and neither the
         Company nor any Company Subsidiary has engaged in any prohibited
         transaction with respect to any employee benefit plan maintained by the
         Company or any Company Subsidiary.

                 (v)   As to any employee pension benefit plan which is subject
         to Title IV of ERISA, there have been no "reportable events" for which
         reporting is not waived (as described in Section 4043 of ERISA), and no
         steps have been taken to terminate any such plan.

                 (vi)  There have been no acts or omissions by the Company or
         any Company Subsidiary which have given rise to or may give rise to any
         material fines, penalties, taxes or related charges under Sections
         502(c), 502(i) or 4071 of ERISA or Chapter 43 of the Code, for which
         the Company, the Surviving Corporation or any Company Subsidiary may be
         liable.

                 (vii) None of the payments contemplated by such plans,
         arrangements and agreements would, in the aggregate, constitute excess
         parachute payments as defined in Section 280G of the Code.

                (viii) There are no actions, suits or claims (other than routine
         claims for benefits) pending or, to the best of the Company's knowledge
         and belief, threatened involving such plans or the assets of such
         plans, and, to the best of the Company's knowledge and belief, no facts
         exist which could give rise to any such actions, suits or claims (other
         than routine claims for benefits).

                 (ix)  All group health plans of the Company and the Company
         Subsidiaries (including any plans of current and former affiliates of
         the Company or any Company Subsidiary which must be taken into account
         under Section 4980B of the Code or Section 601 of ERISA) have been
         operated in material compliance with the group health plan continuation
         coverage requirements of Section 4980B of the Code and Section 601 of
         ERISA to the extent such requirements are applicable.



                                      -19-
<PAGE>   182

                   (x) Consistent with generally accepted accounting principles
         and the accounting practices and procedures of the Company and the
         Company Subsidiaries, and without limiting any other provision of this
         Agreement, adequate liabilities for the unfunded present value of all
         obligations under such plans, arrangements and agreements, which have
         been actuarially determined, are reflected in the 1997 Balance Sheet
         and will be reflected on the books of the Company and the Company
         Subsidiaries at all times between the date hereof and the Effective
         Time.

          Section 2.17. Powers of Attorney. No power of attorney or similar
authorization given by the Company or any of the Company Subsidiaries is
currently outstanding.

        Section 2.18. Conduct of Business Since December 31, 1997. Since
December 31, 1997, to the date hereof, except as disclosed on Schedule 2.18
hereto, neither the Company nor any Company Subsidiary has: (a) experienced any
change in financial condition, assets, liabilities or business, except for
changes in the ordinary course of business which, taken as a whole, have not
been materially adverse; (b) except (in the case of the Company) as contemplated
by this Agreement, conducted its business or entered into any transaction
otherwise than in the ordinary course of business, or incurred or become subject
to any liabilities or obligations except current liabilities routinely incurred
in the ordinary course of business in customary amounts (indebtedness, other
than deposits and FHLB advances accepted by Company Subsidiaries which are banks
or savings and loans in the ordinary course of their business, maturing more
than one year after its creation is not for purposes of this Agreement
considered as being in the "ordinary course"); (c) sold or otherwise disposed of
any of its investment securities; (d) mortgaged, pledged, or subjected to lien,
charge or other encumbrance any of its assets, or sold or transferred any of
such assets (other than its investment securities), except in the ordinary
course of business; (e) other than pursuant to the exercise of options, issued,
agreed to issue or sold any shares of its capital stock (whether authorized and
unissued or held in the treasury) or debt obligations (other than deposits
accepted by a Company Subsidiary which is a financial institution in the
ordinary course of its business); (f) granted any options, warrants or other
rights for the purchase or sale of its capital stock; (g) directly or indirectly
purchased, redeemed or otherwise acquired or agreed to purchase, redeem or
otherwise acquire any shares of its capital stock; (h) suffered the filing, or
became aware of any basis for the institution of, any action, suit, proceeding
or governmental investigation, which might have a Material Adverse Effect on it
or the Surviving Corporation; (i) declared, agreed to declare, set apart for
payment or paid any dividend or made any other distribution in respect of any
shares of its capital stock, other than quarterly cash dividends; or (j) except
(in the case of the Company) as contemplated by this Agreement, entered into any
other material transaction other than in the ordinary course of business.

        Section 2.19. Conduct of Business Pending Merger. From and after the
date hereof and until the Effective Time, except with the prior written consent
of Mahaska, each of the Company and the Company Subsidiaries will: (a) maintain
its property and assets in their present state of repair, order and condition,
reasonable wear and tear and damage by fire or other casualty fully covered by
insurance excepted; (b) maintain its books, accounts and records in accordance
with generally accepted accounting principles and practices applied on a basis
consistent with the audited financial statements of the Company and the Company
Subsidiaries referred to in Section 2.5(a)(i) hereof; (c) use best efforts to
comply with all laws applicable to the conduct of



                                      -20-
<PAGE>   183
its business; (d) conduct its business only in the usual, regular and ordinary
course and in substantially the same manner as heretofore conducted and in all
cases consistent with prudent banking practices, and not make any purchase or
sale, except in a manner consistent with prior practice; (e) make no change in
its certificate of incorporation, articles of incorporation, charter or articles
of association, as the case may be, or by-laws; (f) use their best efforts to
maintain and keep in full force and effect all fire and other insurance on
property and assets, all liability insurance, and all bonds on personnel,
presently carried by it and immediately provide written notice to Mahaska of a
lapse thereof; (g) not buy, acquire, sell or otherwise dispose of any investment
securities in any one transaction in excess of $2,000,000 or transactions in the
aggregate of $5,000,000 in any one calendar month; (h) not sell, mortgage,
subject to lien, pledge or encumber or otherwise dispose of any of its property
and assets otherwise than in the ordinary course of business; (i) not redeem or
otherwise acquire or agree to redeem or otherwise acquire any shares of its
capital stock; (j) make no change in the number of shares of its capital stock
issued and outstanding (other than pursuant to the exercise of outstanding
options), and grant no option, warrant or similar right relating to any of its
capital stock; (k) use its best efforts to preserve its business organization
intact, to keep available the services of its present officers and employees and
to preserve the goodwill of its customers and others having business relations
with it; (l) not enter into any employment contract which is not terminable
without penalty or other liability upon 30 or fewer days' notice, provided
however, existing employment agreements may be renewed for up to a one year
period so long as the aggregate term thereunder does not exceed three (3) years;
(m) not declare or pay any dividend nor make any other distribution in respect
of any shares of its capital stock, except customary quarterly dividends not to
exceed ten (10(cent)) per share; (n) not make any borrowings, except in the
ordinary course of business (indebtedness, other than deposits and FHLB advances
accepted by a Company Subsidiary which is a financial institution in the
ordinary course of its business, maturing more than one year after its creation
is not for purposes of this Agreement considered as being in the "ordinary
course"); (o) not purchase or invest in securities or obligations having a
maturity of more than five (5) years from the date of purchase; (p) not increase
the hourly rates of pay of its employees or increase the fixed compensation
payable to any of its officers or employees, except for such increases which are
consistent with past salary review practices or as required by law; (q) not pay
any bonus or commission, except in accordance with past practices; (r) except as
otherwise contemplated by this Agreement, not establish or amend any "employee
welfare benefit plan," "employee pension benefit plan," or "fringe benefit
arrangements," referred to in Section 2.16 hereof, or any other plan or
arrangement of a similar nature; (s) not extend credit or make advances to any
customer of a Company Subsidiary which is a financial institution who is listed
on such Company Subsidiary's problem or watch list or who has any outstanding
loan, advance or other credit which is in default of payment of principal or
interest or otherwise in material default, has been placed on non-accrual status
or has been classified by such Company Subsidiary's examiners (regulatory or
internal) as among "Other Loans Specifically Mentioned," or as "Substandard,"
"Doubtful" or "Loss," without Mahaska's prior written consent; (t) not extend
credit or make advances in excess of $250,000 to new or existing customers; (u)
not make any tax election or take any other action (including, but not limited
to, change in depreciation methods, estimated payments, change in tax year,
method of accounting, etc.) which could affect the Federal, state, county or
local tax liability of the Company or any Company Subsidiary, without Mahaska's
prior written consent; (v) not enter into any other material transaction other
than in the ordinary course of business; and (w) not voluntarily and knowingly
take any action in anticipation of the Merger


                                      -21-
<PAGE>   184
which may have a Material Adverse Effect on the Company, the Surviving
Corporation or the Bank.

        Section 2.20. Oral Commitments. Except as disclosed on Schedule 2.20
hereto, the records of the Company and the Company Subsidiaries contain accurate
copies of all contracts, commitments or arrangements of a material nature and
not reduced to writing, in which the Company or any Company Subsidiary has
agreed: (a) to loan money, to extend credit, or to make other financial
accommodations, to or for the benefit of another party; (b) to waive, release,
modify, extend or defer the obligations, or terms thereof, of any other party to
repay indebtedness owing to the Company or a Company Subsidiary; (c) to release,
relinquish or discharge any guarantor, surety, or other party liable on any
indebtedness owing to the Company or a Company Subsidiary; or (d) to release or
surrender, in whole or in part, any collateral or rights securing the obligation
of any party primarily or secondarily liable for repayment of indebtedness to
the Company or a Company Subsidiary.

        Section 2.21. Loans. (a) The allowance for loan losses reflected on the
1997 Balance Sheet was, and such allowance reflected on each consolidated
balance sheet of the Company and the Company Subsidiaries as of any date
subsequent to the date hereof, which is required to be furnished by the Company
to Mahaska pursuant to Section 2.6(a)(i) hereof will in the reasonable opinion
of management of the Company be, in each case as of the date thereof, adequate
in accordance with generally accepted accounting principles to provide for
losses relating to or inherent in the loan and lease portfolios (including
accrued interest receivables) of the Company and the Company Subsidiaries and
other extensions of credit (including letters of credit and commitments to make
loans or extend credit) by the Company and the Company Subsidiaries.

         (b) As of the date hereof, the aggregate amount of all Non-Performing
and Materially Impaired Assets (as hereinafter defined) on the books of the
Company and the Company Subsidiaries does not exceed 2.0% of the gross amount of
all loans on the books of the Company and the Company Subsidiaries.
"Nonperforming and Materially Impaired Assets" shall mean (i) loans, leases and
other extensions of credit which are accounted for on a nonaccrual basis, (ii)
assets constituting real estate acquired through foreclosure, including
in-substance foreclosed real estate, (iii) loans which have been restructured
and are required to be reported in accordance with OTS regulations and (iv)
loans and leases (A) that are 90 days or more past due in payment of principal
or interest, (B) with respect to which a reasonable doubt exists as to the
timely collectibility thereof, (C) the interest rate terms of which have been
reduced to below market rates by agreement subsequent to the agreement under
which such loans or leases were originally created, (D) that are subject to a
material breach or default by any obligor thereon, or (E) as to which any
obligor thereon is subject to a pending bankruptcy, reorganization or similar
proceeding.

         (c) Except as disclosed on Schedule 2.21(c) hereto, (i) each
outstanding loan, lease or other extension of credit of the Company or any of
the Company Subsidiaries is a legal, valid and binding obligation, is in full
force and effect and is enforceable 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 equitable principles limiting the
right to obtain specific performance or other similar relief; (ii) each of the
Company and the Company Subsidiaries has





                                      -22-
<PAGE>   185

duly performed in all material respects all of its obligations thereunder to the
extent that such obligations to perform have accrued; (iii) all documents and
agreements necessary for the Company or any of the Company Subsidiaries that is
a party thereto to enforce such loan, lease or other extension of credit are in
existence; (iv) to the knowledge of the Company no claims, counterclaims,
set-off rights or other rights exist, nor do the grounds for any such claim,
counterclaim, set-off right or other right exist, with respect to any such
loans, leases or other extensions of credit which could impair the
collectibility thereof; and (v) each such loan, lease and extension of credit
has been, in all material respects, originated and serviced in accordance with
the Company's or any Company Subsidiary's then applicable underwriting
guidelines, the terms of the relevant credit documents and agreements and
applicable laws and regulations.

         (d) Schedule 2.21(d) hereto lists all loan commitments exceeding
$250,000 of the Company and the Company Subsidiaries outstanding as of the date
hereof. Except as set forth on Schedule 2.21(d) hereto, as of the date hereof,
(i) there are no loans, leases, other extensions of credit or commitments to
extend credit of the Company or any of the Company Subsidiaries that have been
or, to the best of the Company's knowledge, should have been classified by the
Company and the Company Subsidiaries as "Other Assets Especially Mentioned,"
"Substandard," "Doubtful," "Loss" or any comparable classification and (ii)
there are no loans due to the Company or any of the Company Subsidiaries as to
which any payment of principal, interest or any other amount is 30 days or more
past due.

        Section 2.22. Derivative Transactions. Except as disclosed on Schedule
2.22 hereto, neither the Company nor any of the Company Subsidiaries has during
the past three (3) years, is or shall engage in transactions in or involving
forwards, futures, options on futures, swaps or other derivative instruments. As
of the date hereof, none of the parties to any contract or agreement entered
into by the Company or any Company Subsidiary with respect to any such
instrument is in default with respect to such contract or agreement, and no such
contract or agreement, were it to be a loan held by the Company or any of the
Company Subsidiaries, would be classified as "Other Assets Especially
Mentioned," "Substandard," "Doubtful," "Loss," or any comparable classification.
The financial position of the Company and the Company Subsidiaries on a
consolidated basis under or with respect to each such instrument has been
reflected in the books and records of the Company and the Company Subsidiaries
in accordance with generally accepted accounting principles consistently
applied, and except as described on Schedule 2.22 hereto, there is no open
exposure of the Company or any of the Company's Subsidiaries with respect to any
such instrument (or with respect to multiple instruments with respect to any
single party).

        Section 2.23. Fiduciary Responsibilities. Schedule 2.23 hereto
identifies each of the Company Subsidiaries that is performing, or has at any
time performed any services as trustee, executor, administrator, registrar,
guardian, custodian, escrow agent, receiver or other fiduciary and the nature of
any such services. All such services have been performed by such Company
Subsidiaries in a manner which complies in all material respects with all
applicable laws, regulations, orders, agreements, wills, instruments and common
law standards.

         Section 2.24 No Broker's or Finder's Fee. Except for Charles Webb &
Company as disclosed on Schedule 2.24 hereto, no agent, broker, financial
advisor or other firm or person is or



                                      -23-
<PAGE>   186
will be entitled to any broker's or finder's fee or similar payment by the
Company or any of the Company Subsidiaries in connection with this Agreement or
the Merger.

        Section 2.25. Other Acquisition Proposals. From and after the date
hereof and until the Effective Time, the Company and the Company Subsidiaries
shall not, and each of them shall cause its directors, officers, employees and
representatives not to, solicit or encourage inquiries or proposals with respect
to, furnish any information relating to, or participate in any negotiations or
discussions concerning, any acquisition or purchase of all or a substantial
portion of the assets of, or a substantial equity interest in, the Company or
any of the Company Subsidiaries or any business combination with the Company or
any of the Company Subsidiaries, other than as contemplated by this Agreement;
provided, however, that the Board of Directors of the Company may take such
action as in the opinion of its counsel may be appropriate to fulfill the
directors' fiduciary obligations with respect to an unsolicited bona fide
inquiry or proposal from another party. The Company shall promptly notify
Mahaska of all such inquiries or proposals.

        Section 2.26.    [Intentionally Omitted].

        Section 2.27. Union Relations. No employees of the Company or any of the
Company Subsidiaries are members of a collective bargaining unit of the Company
or any of the Company Subsidiaries, and there have not been any, and there are
no threatened or contemplated, attempts to organize for collective bargaining
purposes any of the employees of the Company or any of the Company Subsidiaries.

        Section 2.28. Patents, Trademarks, Etc. Schedule 2.28 hereto sets forth
all domestic and foreign letters patent, patents, patent applications, patent
licenses, computer programs, proprietary software (not shelf software, which
costs less than five thousand dollars ($5,000.00) per year), software licenses,
microfiche, know-how licenses, copyrights, unpatented inventions, trademarks,
service marks, trade names, trademarks and service mark registrations and
applications, copyright registrations and applications and similar industrial,
commercial or intellectual rights owned or applied for by the Company or the
Company Subsidiaries or used in connection with the operation of the business of
the Company or the Company Subsidiaries (hereinafter referred to as the "Company
Intellectual Property"). Except as indicated on Schedule 2.28 hereto, there are
no claims or demands of any person, firm or corporation pertaining to the
Company Intellectual Property, and no proceedings have been instituted, or are
pending or, to the best knowledge of the Company, threatened which challenge the
rights of the Company or any of the Company Subsidiaries in respect thereof, and
none of the Company Intellectual Property is subject to any outstanding order,
decree, judgment, stipulation, injunction, restriction or agreement restricting
the scope or the use thereof. To the best knowledge of the Company, neither the
Company nor any of the Company Subsidiaries is infringing or violating, and
during the past five (5) years has not infringed or violated, any adversely held
patent, copyright, trademark, service mark, trade name or similar right, or
engaged in any kind of unfair or unlawful competition or wrongfully used any
confidential information or trade secrets or patentable inventions of any former
employee of the Company or any of the Company Subsidiaries or any other person,
firm or corporation. To the best knowledge of the Company, neither the Company
nor any of the Company Subsidiaries is wrongfully using any such information nor
does any of them have any knowledge of any patented device or application



                                      -24-
<PAGE>   187
thereof which would materially and adversely affect any aspect of the business
or operations of the Company, the Surviving Corporation or any Company
Subsidiary. Except as set forth on Schedule 2.28 hereto, the Company and the
Company Subsidiaries have the right and authority, and the Surviving Corporation
and the Company Subsidiaries will have the right and authority from and after
the Effective time to use all Company Intellectual Property as is necessary to
enable them to conduct and to continue to conduct all phases of the business of
the Company and the Company Subsidiaries in the manner presently conducted by
them, and such use, to the best knowledge of the Company, does not, and will
not, conflict with, infringe on or violate any patent, copyright, trademark,
service mark, trade name or any other rights of others.

        Section 2.29. Takeover Laws Not Applicable. The provisions of Section
203 of the Delaware Law will not apply to this Agreement, the Merger or the
transactions contemplated hereby and thereby. The Company has taken all steps
necessary to irrevocably exempt the transactions contemplated by this Agreement
from such Section 203 and any other applicable state takeover law and from any
applicable charter or contractual provision containing change of control or
anti-takeover provisions.

        Section 2.30. Material Interests of Certain Persons. Except as disclosed
on Schedule 2.30 hereto, no officer or director of the Company, or any
"associate" (as such term is defined in Rule 14a-1 under the Exchange Act) of
any such officer or director, has any material interest in any material contract
or property (real or personal), tangible or intangible, used in or pertaining to
the business of the Company or any of the Company Subsidiaries.

        Section 2.31. Disclosure; Information in the Proxy Statement/Prospectus.
No representation or warranty by the Company in this Agreement and no statement
contained in any certificate furnished or to be furnished by the Company to
Mahaska pursuant to the provisions of this Agreement contains or will contain
any untrue statement of material fact or omits or will omit to state any
material fact necessary, in light of the circumstances under which it is made,
in order to make the statements herein or therein not misleading. Any written
information supplied by the Company specifically for inclusion or incorporation
by reference in the Proxy Statement/Prospectus and which is included or
incorporated by reference therein shall not, at the date the Proxy
Statement/Prospectus (or any amendment thereof or supplement thereto) is filed
with the SEC, at the time of the Mahaska shareholders' meeting (the "Mahaska
Meeting", as described in Section 4.4 hereof), at the time of the Company's
shareholders meeting (the "Company Meeting", as described in Section 4.2
hereof), and at the time the Proxy Statement/Prospectus becomes effective with
the SEC as a registration statement, be false or misleading with respect to any
material fact, omit to state any material fact required to be stated therein or
necessary in order to make the statements made therein, in the light of the
circumstances under which they are made, not misleading, or omit to state any
material fact necessary to correct any statement in any earlier communication
with respect to the solicitation of proxies for the Mahaska Meeting or the
Company Meeting that has become materially false or misleading. If at any time
prior to the Effective Time any event relating to any of the Company
Subsidiaries or any of their respective directors or officers should be
discovered by the Company which should be set forth in a supplement to the Proxy
Statement/Prospectus, the Company shall promptly inform Mahaska in writing.
Notwithstanding the foregoing, the Company makes no representation or warranty
with respect to any information to be contained in the Proxy


                                      -25-
<PAGE>   188
Statement/Prospectus other than information provided in writing by the Company
specifically for inclusion or incorporation by reference in the Proxy
Statement/Prospectus. For purposes of this Section and this Agreement, "Proxy
Statement/Prospectus" means the joint proxy which constitutes (i) a proxy
statement to be delivered to Mahaska's shareholders in connection with the
Mahaska Meeting, (ii) a registration statement on Form S-4 to be filed by
Mahaska with the SEC to register the Mahaska Common Stock that will be received
by the shareholders of the Company in the Merger pursuant to the Securities Act
of 1933, as amended (the "Securities Act"), and (iii) a joint proxy statement
and prospectus to be delivered to the Company's shareholders in connection with
the Mahaska Common Stock and the Company Meeting with respect to the Merger.

        Section 2.32. Year 2000 Compliant. At Mahaska's request, the Company
will furnish to Mahaska a true, correct and complete copy of any internal
investigations, memorandum, budget plans, forecasts or reports concerning the
Year 2000 Compliance of the products, services, operations, systems, supplies
and facilities of the Company and its Subsidiaries and their vendors. The
Company and its Subsidiaries are in compliance in all material respects with the
Year 2000 guidelines of the Federal Financial Institutions Examination Counsel
as set forth in its Interagency Statement dated May 5, 1997. Neither the Company
nor any of the Company Subsidiaries will receive a rating of less than
"satisfactory" on any Year 2000 Report of Examination of any Regulatory
Authority. The Company has disclosed to Mahaska a complete and accurate copy of
its plan, including an estimate of the anticipated associated costs, for
addressing the issues set forth in the statements of the FFIEC dated May 5,
1997, entitled "Year 2000 Project Management Awareness," and December 17, 1997,
entitled "Safety and Soundness Guidelines Concerning the Year 2000 Business
Risk," as such issues affect it and its Subsidiaries, and such plan is in
material compliance with the schedule set forth in the FFIEC statements.

        Section 2.33. No Company Investment in Mahaska Common Stock. Neither the
Company nor the Company Subsidiaries has acquired or is the beneficial owner
of any Mahaska Common Stock.

        Section 2.34. Board Recommendation. The Board of Directors of the
Company has, by resolutions duly adopted by the requisite vote of directors
present at a meeting of such Board duly called and held on February 2, 1999,
determined that the Merger in accordance with the terms of this Agreement is
fair and in the best interests of its shareholders, and will recommend that the
shareholders of the Company adopt this Agreement subject to its fiduciary
obligations.

        Section 2.35. Vote Required. The adoption of this Agreement by holders
of [a majority of the outstanding shares] of the Company's Common Stock is the
only vote of the holders of any class or series of the capital stock of the
Company required to approve this Agreement, the Merger and the other
transactions contemplated hereby.

        Section 2.36. Shareholder Appraisal Rights. The Company shall not settle
or compromise any claim for shareholder appraisal rights in respect of the
Merger prior to the Effective Time without the prior written consent of Mahaska.


                                      -26-
<PAGE>   189

                                   ARTICLE III


              REPRESENTATIONS, WARRANTIES AND AGREEMENTS OF MAHASKA

         As an inducement to the Company to enter into and perform this
Agreement, Mahaska represents and warrants to, and agrees with, the Company as
follows:

         Section 3.1. Organization of Mahaska. Mahaska is a corporation duly
organized, validly existing and in good standing under the laws of the State of
Iowa, with full corporate power and authority to own its property and conduct
its business and to enter into and perform this Agreement. Mahaska is duly
authorized to transact business in, and is in good standing under the laws of,
the State of Iowa. The character of the properties owned and leased by Mahaska
and the nature of the business conducted by it do not require that Mahaska be
qualified to do business in any other state or jurisdiction, except where the
failure to be so qualified would not have a Material Adverse Effect on Mahaska.

         Section 3.2. Mahaska Stock. (a) As of the date of this Agreement, the
authorized capital stock of Mahaska consists of 20,000,000 shares of Common
Stock, $5.00 par value, of which 3,636,345 shares of such Common Stock are
issued and outstanding and 171,156 shares of such Common Stock are held in
Mahaska's treasury.

         (b) Prior to the Effective Time, Mahaska has an adequate number of
Common Stock to make the issuances contemplated hereby.

         (c) The shares of Mahaska Common Stock to be issued in the Merger
pursuant to this Agreement (including any shares to be issued pursuant to the
exercise of any Company options which, by virtue of the Merger, will be
converted into the right to acquire Mahaska Common Stock) will, when issued, be
duly authorized, validly issued, fully paid and non-assessable.

         (d) Each subsidiary of Mahaska (the "Mahaska Subsidiaries") which is a
financial institution is duly organized, and validly existing as an Iowa banking
corporation or savings association under the laws of the State of Iowa or, if a
national bank, or federal thrift or savings association, as a national banking,
thrift or savings association under the laws of the United States. Each of the
Mahaska Subsidiaries which is not a financial institution is duly organized,
validly existing and in good standing under the laws of its state of
incorporation. All of the Mahaska Subsidiaries have full corporate power and
authority to own or lease their properties and carry on their businesses as now
being conducted, and each is qualified to do business as a foreign corporation
in each state where the character and location of its properties or the nature
of the business conducted by it requires qualification. All necessary regulatory
approvals for the acquisition and ownership by Mahaska of the capital stock of
each of the Mahaska Subsidiaries have been received by Mahaska. Each of the
Mahaska Subsidiaries has all consents, permits, franchises, licenses,
concessions, authorities (including without limitation all easements, rights of
way and similar authorities), authorizations and approvals of Federal, state and
local governmental authorities and other persons and entities required in
connection with the ownership and operation of its properties and the carrying
on of its business as now being conducted, all of which are in full force and
effect and no suspension or cancellation of any of which is threatened,




                                      -27-
<PAGE>   190
except for those whose failure to obtain or maintain would not have a Material
Adverse Effect on Mahaska, other than consents, authorizations and approvals
required relating to the transactions contemplated by this Agreement.

         (e) All shares of the issued and outstanding capital stock of each of
the Mahaska Subsidiaries are validly issued, fully paid and non-assessable, were
not issued in violation of the preemptive rights of any person, and were issued
in full compliance with all applicable state and Federal laws.

         (f) There are no outstanding warrants, options, subscriptions,
contracts, rights or other arrangements or commitments obligating any Mahaska
Subsidiary to issue any additional shares of its capital stock, nor are there
any securities, debts, obligations or rights outstanding which are convertible
into or exchangeable for shares of its capital stock. There are not outstanding
contracts, rights or other arrangements or commitments which would obligate any
Mahaska Subsidiary to purchase or redeem or otherwise acquire any shares of its
capital stock or any other security.

         Section 3.3. Corporate Authorization. The execution, delivery and
performance of this Agreement and the related documents have been duly and
validly authorized and approved by the Board of Directors of Mahaska and, do not
and will not violate or conflict with the articles of incorporation or by-laws
of Mahaska and do not and will not violate or conflict with or result in any
material default, any acceleration of required performance or any loss of a
material benefit under any note, bond, mortgage, indenture, lease, franchise,
license, permit, approval, contract, agreement or other instrument or document
or any order, writ, injunction, decree, judgment, statute, rule or regulation to
which Mahaska or any Mahaska Subsidiary is a party or subject or by which
Mahaska or any Mahaska Subsidiary is a party (other than the regulatory
approvals referred to in Section 4.1 hereof, the approval of the Agreement and
the Merger by Mahaska's shareholders is necessary to consummate the Merger.

         Section 3.4. Financial Statements Previously Delivered. (a) As soon as
available, Mahaska will furnish to the Company copies of the following financial
statements:

                   (i) All financial statements of Mahaska and the Mahaska
         Subsidiaries as of any date, or for any period ending, after December
         31, 1997, which shall be issued or distributed to shareholders,
         directors or management of Mahaska and its financial institution
         subsidiaries prior to the Effective Time; and

                  (ii) An unaudited consolidated balance sheet of Mahaska and
         its subsidiaries as of September 30, 1998, together with a related
         statement of profit and loss for the three-month period then ended.

         (b) Each of the financial statements referred to in paragraph (a) of
this Section has been prepared in accordance with generally accepted accounting
principles and practices consistently applied (except for the absence of
footnotes and year end adjustments in the case of the unaudited financial
statements as of and for the period ended September 30, 1998). Each of the
financial statements referred to in paragraph (a) of this Section is true,
correct and complete in all material


                                      -28-
<PAGE>   191
respects and presents fairly the financial condition of Mahaska and the Mahaska
Subsidiaries on a consolidated basis, or, as the case may be, the financial
condition of a Company Subsidiary, as of the date thereof or, as the case may
be, the results of operations (on a consolidated basis, if applicable) for the
period covered thereby

         Section 3.5. Governmental Regulation. (a) Each of Mahaska and its
subsidiaries holds all consents, licenses, certificates, permits,
authorizations, approvals, franchises and rights of Federal, state, local and
other public authorities and other persons and entities required in connection
with the ownership and operation of its properties and the carrying on of its
business as now being conducted, all of which are now in full force and effect,
and between the date hereof and the Effective Time, Mahaska will, and will cause
each of its subsidiaries to, maintain all such consents, licenses, certificates,
permits, authorizations, approvals, franchises and rights in full force and
effect. Each of Mahaska and its subsidiaries has conducted its business so as to
comply in all material respects with all applicable Federal, state and local
statutes, regulations, ordinances and rules, including (without limitation)
applicable banking laws, Federal and state securities laws, and laws and
regulations concerning minimum capital requirements, truth-in-lending, usury,
fair credit reporting, fair lending and equal credit opportunity, currency
reporting, community reinvestment, Internal Revenue Service information
reporting and back-up withholding, consumer protection, occupational safety,
employee benefit plans, environmental matters, fair employment practices and
fair labor standards. Since December 31, 1994, neither Mahaska nor any of
Mahaska's Subsidiaries has received from any governmental or regulatory
authority any written requirement, recommendation or suggestion of a material
nature concerning their capital structure, loan policies or portfolio, or other
banking or business practices or procedures that has not been resolved to the
reasonable satisfaction of such regulatory authority.

         (b) Mahaska is duly registered as a bank holding company pursuant to
the BHC Act and as a savings and loan holding company with the OTS.

         (c) Mahaska has previously furnished to the Company copies of (i)
Mahaska's Annual Reports on Form 10-K and Quarterly Reports on Form 10-Q since
December 31, 1994, in each case as filed with the SEC, (ii) the Company's annual
reports on Form Y-6 and quarterly reports on Form Y-9 since December 31, 1994,
each as filed with the FRB, and (iii) all other documents incorporated by
reference in whole or in part in the foregoing (the documents referred to in (i)
through (iii), including all amendments and supplements thereto and all
financial statements and notes contained therein, are hereinafter collectively
referred to as the "Reports"). The Reports, as of the respective times of filing
thereof with the SEC or the FRB, as the case may be, complied as to form and
substance with all material requirements of the laws, rules and regulations
applicable thereto and did not include any untrue or misleading statement of or
with respect to a material fact or omit to state any material fact necessary in
order to make the statements made therein, in the light of the circumstances
under which they were made, not misleading. Since December 31, 1994, Mahaska and
each of Mahaska's Subsidiaries have filed all reports and registration
statements required to be filed by each of them with the SEC, the FRB or any
other regulatory authority in accordance with all material requirements of the
laws, rules and regulations applicable thereto except where the failure to so
file such reports and registration statements will not have a Material Adverse
Effect on Mahaska, any Mahaska Subsidiary that is a financial institution or the
consummation of the transactions contemplated by this Agreement. From and





                                      -29-
<PAGE>   192
after the date hereof until the Effective Time, concurrently with the filing
thereof with any regulatory agency or the mailing thereof to the shareholders of
Mahaska, as the case may be, Mahaska will deliver to the Company copies of any
of the reports not previously filed or mailed as aforesaid prior to the date
hereof.

         Section 3.6. Disclosure; Information in the Proxy Statement/Prospectus.
No representation or warranty by Mahaska in this Agreement and no statement
contained in any certificate furnished or to be furnished by Mahaska to the
Company pursuant to the provisions of this Agreement contains or will contain
any untrue statement of material fact or omits or will omit to state any
material fact necessary, in light of the circumstances under which it is made,
in order to make the statements herein or therein not misleading. Any written
information supplied by Mahaska specifically for inclusion or incorporation by
reference in the Proxy Statement/Prospectus and which is included or
incorporated by reference therein shall not, at the date the Proxy
Statement/Prospectus (or any amendment thereof or supplement thereto) is filed
with the SEC, at the time of the Mahaska Meeting, at the time of the Company
Meeting, and at the time the Proxy Statement/Prospectus becomes effective with
the SEC as a registration statement, be false or misleading with respect to any
material fact, omit to state any material fact required to be stated therein or
necessary in order to make the statements made therein, in light of the
circumstances under which they are made, not misleading, or omit to state any
material fact necessary to correct any statement in any earlier communication
with respect to the solicitation of proxies for the Mahaska Meeting or the
Company Meeting that has become materially false or misleading. If at any time
prior to the Effective Time any event relating to Mahaska or its directors or
officers should be discovered by Mahaska which should be set forth in a
supplement to the Proxy Statement/Prospectus, Mahaska shall promptly inform the
Company in writing. Notwithstanding the foregoing, Mahaska makes no
representation or warranty with respect to any information to be contained in
the Proxy Statement/Prospectus which is provided in writing by the Company
specifically for inclusion or incorporation by reference in the Proxy
Statement/Prospectus.

         Section 3.7. No Mahaska Investment in the Company's Common Stock.
Mahaska has not acquired or is the beneficial owner of any of the Company's
Common Stock.

         Section 3.8. Board Recommendation. The Board of Directors of Mahaska
has, by resolutions duly adopted by the requisite vote of directors present at a
meeting of such Board duly called and held on February 2, 1999, determined that
the Merger in accordance with the terms of this Agreement is fair and in the
best interests of its shareholders and will recommend, subject to their
fiduciary duties, that the shareholders of Mahaska approve the Merger and ratify
this Agreement.

         Section 3.9. Vote Required. The approval of the Merger by holders of a
majority of the outstanding shares of Mahaska Common Stock is the only vote of
the holders of any class or series of the capital stock of Mahaska required to
approve this Agreement, the Merger and the other transactions contemplated
hereby.

        Section 3.10. Undisclosed Liabilities. All Liabilities have, in the case
of Mahaska and the Mahaska Subsidiaries, been disclosed or reserved against in
Mahaska's audited financial





                                      -30-
<PAGE>   193
statements as of December 31, 1997 or in the notes thereto (the "Mahaska 1997
Balance Sheet"), and Mahaska and the Mahaska Subsidiaries have no other
Liabilities except (a) Liabilities incurred since December 31, 1997 in the
ordinary course of business or (b) as disclosed on Schedule 3.10.

        Section 3.11. Environmental Matters. (a) Except as disclosed on Schedule
3.11(a), to the best of Mahaska's knowledge, no Hazardous Materials have been
located in or on any of the real property owned or used by Mahaska or any
Mahaska Subsidiaries (hereinafter referred to collectively as the "Mahaska Real
Property") or have been released into the environment, or discharged, emitted,
placed or disposed of at, on, under or by the Mahaska Real Property, and the
Mahaska Real Property and the operations of Mahaska and the Mahaska Subsidiaries
thereon have complied in all respects with any applicable Environmental Laws,
and any applicable law, regulation or requirement relating to environmental and
occupational health and safety matters and Hazardous Materials. None of the
Mahaska Real Property is a facility at which there has been a release of
Hazardous Materials that exceeds or violates any applicable or relevant and
appropriate Environmental Laws. Except as disclosed in the Disclosure Statement,
there exist no underground storage tanks, landfills, or land disposal or dumps
on the Mahaska Real Property. None of the Mahaska Real Property is discharging
oil or poses a substantial threat of a discharge of oil, within the meaning of
the Oil Pollution Act of 1990.

         (b) Except as disclosed on the Schedule 3.11(b) hereto no real property
occupied, owned, operated, leased or used by Mahaska or any Mahaska Subsidiary,
or in which any Mahaska Subsidiary holds a beneficial interest, whether as
owner, mortgagee or otherwise, including (without limitation) as a holder of a
collateral assignment of a beneficial interest in a land trust, constitutes a
hazardous substance disposal site listed pursuant to Section 455B.426 of the
Iowa Code, the use or transfer of which is restricted under Section 455B.430 of
the Iowa Code.

        Section 3.12. Governmental Regulations. (a) Each of Mahaska and the
Mahaska Subsidiaries holds all consents, licenses, certificates, permits,
authorizations, approvals, franchises and rights of Federal, state, local and
other public authorities and other persons and entities required in connection
with the ownership and operation of its properties and the carrying on of its
business as now being conducted, all of which are now in full force and effect,
and between the date hereof and the Effective Time, Mahaska will use its best
efforts to, and will cause each Mahaska Subsidiary to use its best efforts to,
maintain all such consents, licenses, certificates, permits, authorizations,
approvals, franchises and rights in full force and effect. Mahaska shall
promptly notify the Company of the loss or threat of loss of any such consent,
license, certificate, permit, authorization, approval, franchise or right.
Neither Mahaska nor any Mahaska Subsidiary which is a financial institution is a
party or subject to any agreement with, or directive or order issued by, the
FRB, the FDIC, the Comptroller of the Currency, the OTS, the Superintendent or
any other regulatory authority, which imposes any restrictions or requirements
not applicable generally to bank holding companies (in the case of the Mahaska)
or financial institutions (in the case of Mahaska Subsidiaries which are
financial institutions), with respect to the conduct of its business. Each of
Mahaska and the Mahaska Subsidiaries has conducted its business so as to comply
in all material respects with all applicable Federal, state and local statutes,
regulations, ordinances and rules, including (without limitation) applicable
banking laws, Federal and state




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securities laws, and laws and regulations concerning minimum capital
requirements, truth-in-lending, usury, fair credit reporting, fair lending and
equal credit opportunity, currency reporting, community reinvestment, Internal
Revenue Service information reporting and back-up withholding, consumer
protection, occupational safety, employee benefit plans, environmental matters,
fair employment practices and fair labor standards. Except as disclosed on
Schedule 3.12 hereto, since December 31, 1994, neither Mahaska nor any of the
Mahaska Subsidiaries has received from any governmental or regulatory authority
any written requirement, recommendation or suggestion of a material nature
concerning their capital structure, loan policies or portfolio, or other banking
or business practices or procedures that has not been resolved to the reasonable
satisfaction of such regulatory authority.

         (b) Mahaska is a bank holding company subject to the "Bank Holding
Company Act of 1956".

         (c) Mahaska and each Mahaska Subsidiary which is a financial
institution are in full compliance with applicable minimum capital requirements
prescribed by the FRB or FDIC and any other regulatory authority having
regulatory jurisdiction over Mahaska or such Mahaska Subsidiary, as the case may
be, and each such Mahaska Subsidiary is "adequately capitalized" or "well
capitalized" within the meanings of such terms as used in Section 38(b) of the
Federal Deposit Insurance Act, as amended (the "FDI Act"), and the applicable
regulations promulgated thereunder.

         (d) Except as set forth on Schedule 3.12(d), the deposits of each
Mahaska Subsidiary which is a financial institution are insured by the FDIC in
accordance with the FDI Act and the rules and regulations of the FDIC adopted
thereunder.

         (e) Mahaska has previously furnished to the Company all requested
copies of (i) Mahaska's Annual Reports on Form 10-K and Quarterly Reports on
Form 10-Q since December 31, 1994, in each case as filed with the SEC, (ii) each
proxy statement relating to any meeting of Mahaska's shareholders (whether
annual or special) which has been held since December 31, 1994, (iii) the annual
reports to Mahaska's shareholders and quarterly reports to Mahaska's
shareholders since December 31, 1994, (iv) Mahaska's reports on Form FRY-6 and
Form FRY-9 since December 31, 1994, each as filed with the FRB, (v) each
financial report of condition and income filed by Mahaska and each Mahaska
Subsidiary with any supervisory authority since December 31, 1994, (vi) all
other reports or registration statements filed by Mahaska or any Mahaska
Subsidiary with the SEC or the FRB since December 31, 1994, and (vii) all other
documents incorporated by reference in whole or in part in the foregoing (the
documents referred to in (i) through (vii), including all amendments and
supplements thereto and all financial statements and notes contained therein,
are hereinafter collectively referred to as the Mahaska Reports"). The Mahaska
Reports, as of the respective times of filing thereof with the SEC, the FRB or
any other regulatory authority, as the case may be, complied as to form and
substance with all material requirements of the laws, rules and regulations
applicable thereto and did not include any untrue or misleading statement of or
with respect to a material fact or omit to state any material fact necessary in
order to make the statements made therein, in the light of the circumstances
under which they were made, not misleading. Since December 31, 1994, Mahaska and
each of the Mahaska Subsidiaries have filed all reports and registration
statements required to





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<PAGE>   195
be filed by each of them with the SEC, the FRB or any other regulatory authority
in accordance with all material requirements of the laws, rules and regulations
applicable thereto except where the failure to so file such reports and
registration statements will not have a material effect on Mahaska or any
Mahaska Subsidiary. From and after the date hereof until the Effective Time,
concurrently with the filing thereof with any regulatory agency or the mailing
thereof to the shareholders of Mahaska, as the case may be, Mahaska will deliver
to the Company copies of any of the Mahaska Reports not previously filed or
mailed as aforesaid prior to the date hereof.

         (f) Mahaska Common Stock is duly registered under Section 12(g) of the
Exchange Act. Mahaska has previously furnished, or will promptly furnish upon
receipt, to the Company copies of any Statements on Schedule 13D, 13G, 14B or
14D-1 and Forms 3, 4 and 5 under the Exchange Act and any amendments to any such
statements or forms received by Mahaska or known by it to have been filed with
the SEC with respect to the ownership of, or solicitation of proxies in
connection with, any of the Mahaska Common Stock.

        Section 3.13. Litigation. Except as disclosed on Schedule 3.13 hereto,
there are no legal, arbitration, quasi-judicial or administrative proceedings of
any kind or nature pending or, to the best of Mahaska's knowledge and belief,
threatened, affecting or involving Mahaska or any of the Mahaska Subsidiaries or
any of their respective properties or any of the Mahaska Stock or the capital
stock of any of the Mahaska Subsidiaries, which may have a Material Adverse
Effect on Mahaska, the Surviving Corporation or any of the Mahaska Subsidiaries,
and there has been no material default on the part of Mahaska or any of the
Mahaska Subsidiaries with respect to any judgment, order, writ, injunction,
decree, award, rule or regulation issued in any legal, quasi-judicial or
administrative proceeding. Schedule 3.13 hereto sets forth a description of all
material litigation, arbitration or quasi-judicial or administrative proceedings
to which Mahaska or any Mahaska Subsidiary was a party at any time since
December 31, 1994.

        Section 3.14. Loans. (a) The allowance for loan losses reflected on the
Mahaska 1997 Balance Sheet was, and such allowance reflected on each
consolidated balance sheet of Mahaska and the Mahaska Subsidiaries as of any
date subsequent to the date hereof, which is required to be furnished by Mahaska
to the Company will in the reasonable opinion of management of Mahaska be, in
each case as of the date thereof, adequate in accordance with generally accepted
accounting principles to provide for losses relating to or inherent in the loan
and lease portfolios (including accrued interest receivables) of Mahaska and the
Mahaska Subsidiaries and other extensions of credit (including letters of credit
and commitments to make loans or extend credit) by Mahaska and the Mahaska
Subsidiaries.

         (b) The aggregate amount of all Non-Performing and Materially Impaired
Assets on the books of Mahaska and the Mahaska Subsidiaries does not exceed 2.0%
of the gross amount of all loans on the books of Mahaska and the Mahaska
Subsidiaries.

         (c) Except as disclosed on Schedule 3.14(c) hereto, (i) each
outstanding loan, lease or other extension of credit of Mahaska or any of the
Mahaska Subsidiaries is a legal, valid and binding obligation, is in full force
and effect and is enforceable 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 equitable principles limiting the
right to obtain specific




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<PAGE>   196
performance or other similar relief; (ii) each of Mahaska and the Mahaska
Subsidiaries has duly performed in all material respects all of its obligations
thereunder to the extent that such obligations to perform have accrued; (iii)
all documents and agreements necessary for Mahaska or any of the Mahaska
Subsidiaries that is a party thereto to enforce such loan, lease or other
extension of credit are in existence; (iv) to the knowledge of Mahaska no
claims, counterclaims, set-off rights or other rights exist, nor do the grounds
for any such claim, counterclaim, set-off right or other right exist, with
respect to any such loans, leases or other extensions of credit which could
impair the collectibility thereof; and (v) each such loan, lease and extension
of credit has been, in all material respects, originated and serviced in
accordance with Mahaska's or any Mahaska Subsidiary's then applicable
underwriting guidelines, the terms of the relevant credit documents and
agreements and applicable laws and regulations.

         (d) Schedule 3.14(d) hereto lists all loan commitments exceeding
$250,000 of Mahaska and the Mahaska Subsidiaries outstanding as of the date
hereof. Except as set forth on Schedule 3.14(d) hereto, as of the date hereof,
(i) there are no loans, leases, other extensions of credit or commitments to
extend credit of Mahaska or any of the Mahaska Subsidiaries that have been or,
to the best of Mahaska's knowledge, should have been classified by Mahaska and
the Mahaska Subsidiaries as "Other Assets Especially Mentioned," "Substandard,"
"Doubtful," "Loss" or any comparable classification and (ii) there are no loans
due to Mahaska or any of the Mahaska Subsidiaries as to which any payment of
principal, interest or any other amount is 30 days or more past due.

        Section 3.15. Derivative Transactions. Except as disclosed on Schedule
3.15 hereto, neither Mahaska nor any of the Mahaska Subsidiaries has during the
past three (3) years, is or shall engage in transactions in or involving
forwards, futures, options on futures, swaps or other derivative instruments. As
of the date hereof, none of the parties to any contract or agreement entered
into by Mahaska or any Mahaska Subsidiary with respect to any such instrument is
in default with respect to such contract or agreement, and no such contract or
agreement, were it to be a loan held by Mahaska or any of the Mahaska
Subsidiaries, would be classified as "Other Assets Especially Mentioned,"
"Substandard," "Doubtful," "Loss," or any comparable classification. The
financial position of Mahaska and the Mahaska Subsidiaries on a consolidated
basis under or with respect to each such instrument has been reflected in the
books and records of Mahaska and the Mahaska Subsidiaries in accordance with
generally accepted accounting principles consistently applied, and except as
described on Schedule 3.15 hereto, there is no open exposure of Mahaska or any
of the Mahaska's Subsidiaries with respect to any such instrument (or with
respect to multiple instruments with respect to any single party).

        Section 3.16. Takeover Laws Not Applicable. No anti-takeover provisions
of the Iowa Act will apply to this Agreement, the Merger or the transactions
contemplated hereby and thereby. Mahaska has taken all steps necessary to
irrevocably exempt the transactions contemplated by this Agreement from any
applicable state takeover law and from any applicable charter or contractual
provision containing change of control or anti-takeover provisions.

        Section 3.17. Year 2000 Compliant. Mahaska and its Subsidiaries are in
compliance in all material respects with the Year 2000 guidelines of the Federal
Financial Institutions Examination Counsel as set forth in its Interagency
Statement dated May 5, 1997. Neither Mahaska nor any of




                                      -34-
<PAGE>   197
the Mahaska Subsidiaries will receive a rating of less than "satisfactory" on
any Year 2000 Report of Examination of any Regulatory Authority. Mahaska has
disclosed to the Company a complete and accurate copy of its plan, including an
estimate of the anticipated associated costs, for addressing the issues set
forth in the statements of the FFIEC dated May 5, 1997, entitled "Year 2000
Project Management Awareness," and December 17, 1997, entitled "Safety and
Soundness Guidelines Concerning the Year 2000 Business Risk," as such issues
affect it and its Subsidiaries, and such plan is in material compliance with the
schedule set forth in the FFIEC statements.


                                   ARTICLE IV


                              ADDITIONAL AGREEMENTS

         Section 4.1. Regulatory Approvals. As promptly as practicable, Mahaska
shall prepare and file, or cause to be prepared and filed, applications on its
part and on the part of its affiliates for required approvals in connection with
the Merger with the FRB pursuant to the BHC Act, the Superintendent, pursuant to
the Iowa Banking Act, and the OTS, pursuant to the Home Owners' Loan Act of
1933, as amended ("HOLA"). The Company will, and will cause each Company
Subsidiary to, cooperate fully in the preparation and submission of such
applications, and without limiting the foregoing, the Company will promptly
furnish Mahaska with any information relating to the Company or any of the
Company Subsidiaries which is required under any applicable law or regulation,
or by any regulatory or governmental authority, for inclusion in any such
application. In the event of an adverse or unfavorable determination by any
regulatory authority, or should the Merger be challenged or opposed by any
administrative or legal proceeding, whether by the United States Department of
Justice or otherwise, the determination of whether and to what extent to defend
any such action, or to seek appeal or review, administrative or otherwise, or
other appropriate remedies shall be made by Mahaska.

         Section 4.2. Meeting of the Company's Shareholders. As soon as
practicable following the approval by the SEC of the Proxy Statement/Prospectus,
the Company shall take all action necessary in accordance with the Delaware
General Corporation Law and its Certificate of Incorporation and Bylaws to
convene a meeting of its shareholders (the "Company Meeting") promptly to
consider and vote upon approval of the Merger and the ratification of this
Agreement. The Company shall, subject to Section 2.25 hereof, use its reasonable
efforts to solicit from the shareholders of the Company proxies in favor of such
approval and ratification and take all other action reasonably necessary or, in
the reasonable opinion of the Company, helpful to secure a vote of the
shareholders of the Company in favor of the Merger and the ratification of this
Agreement.

         Section 4.3. Cooperation in Registration of Mahaska Common Stock. The
Company shall cooperate fully with Mahaska and shall furnish such information
concerning the Company as Mahaska shall request in connection with the
registration with the SEC by Mahaska of the Mahaska Common Stock and the
preparation and filing with the SEC by Mahaska of the Proxy Statement/Prospectus
in connection with the Mahaska Meeting. In addition, the Company shall obtain
the consent of KPMG Peat Marwick LLP to the inclusion of such audited financial





                                      -35-
<PAGE>   198
statements of the Company in the Proxy Statement/Prospectus as may be necessary
or desirable, as determined by Mahaska.

         Section 4.4. Meeting of Mahaska Shareholders. As soon as practicable
following the approval by the SEC of the Proxy Statement/Prospectus, Mahaska
shall take all action necessary in accordance with the Iowa Business Corporation
Act and its Articles of Incorporation and Bylaws to convene a meeting of its
shareholders (the "Mahaska Meeting") promptly to consider and vote upon approval
of the Merger, the ratification of this Agreement, and the approval of the
issuance of the Mahaska Common Stock to the Company shareholders. Mahaska will
use its reasonable efforts to solicit from the shareholders of Mahaska proxies
in favor of such approvals and ratification and will take all other action
reasonably necessary or, in the reasonable opinion of Mahaska, helpful to secure
a vote of the shareholders of Mahaska in favor of the Merger, the ratification
of this Agreement and the issuance of Mahaska Common Stock contemplated hereby
and thereby.

         Section 4.5. Registration and Listing of Mahaska Common Stock. As soon
as practicable after the date of this Agreement, Mahaska will file a
registration statement on Form S-4 with the SEC under the Securities Act with
respect to the offering, sale, and delivery of the shares of Mahaska Common
Stock to be issued to the Company's shareholders pursuant to this Agreement; and
Mahaska will use all reasonable efforts to cause such registration statement to
become effective as promptly as practicable after filing and to cause the shares
of Mahaska Common Stock registered thereby to be duly quoted for trading on the
Nasdaq National Market ("Nasdaq"). Mahaska shall also use all reasonable efforts
to take any action required to be taken under state securities laws with respect
to the Mahaska Common Stock.

         Section 4.6. Cooperation in Preparation of Proxy Statement/Prospectus.
Mahaska shall cooperate fully with the Company and shall furnish such
information concerning Mahaska as the Company shall request in connection with
the preparation and filing with the SEC by the Company of the Proxy
Statement/Prospectus in connection with the Company Meeting. In addition,
Mahaska shall obtain the consent of KPMG Peat Marwick LLP to the inclusion of
such audited financial statements of Mahaska in the Proxy Statement/Prospectus
as may be necessary or desirable, as determined by Mahaska.

         Section 4.7. Pooling of Interests Opinion and Tax Opinion. As promptly
as practicable, Mahaska shall receive the opinions referred to in Section 5.4
hereof. The Company shall cooperate in providing information and taking action
if required or deemed appropriate by Mahaska and will, and will cause each
Company Subsidiary to, cooperate fully in such request, and, without limiting
the foregoing, the Company will promptly furnish Mahaska with any information
relating to the Company or any of the Company Subsidiaries which is required or
deemed appropriate by Mahaska for inclusion in such request.

         Section 4.8. Access and Information. The Company shall, and shall cause
each Company Subsidiary to, afford to Mahaska, its directors, officers,
employees, accountants, counsel and other representatives (hereinafter referred
to as the "Mahaska Representatives") access, during the period from the date
hereof to the Effective Time, to the properties, assets, books, contracts,
returns, reports and records of the Company and the Company Subsidiaries, and
the Company





                                      -36-
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shall, and shall cause the Company Subsidiaries to, furnish to Mahaska such
other information concerning the respective businesses, properties and personnel
of the Company and each Company Subsidiary as Mahaska may reasonably request.
Mahaska shall keep confidential, and shall cause the Mahaska Representatives to
keep confidential, any such information so obtained from the Company and the
Company Subsidiaries, including lists of the Company's stockholders furnished to
Mahaska in accordance with the terms of Section 4.6 hereof; provided, however,
that the foregoing restriction shall not apply to any such information which is
or comes into the public domain otherwise than as a result of a breach of the
provisions of this Section, was in the possession of Mahaska or any Mahaska
Representative prior to the negotiations with the Company relating to this
Agreement or at any time comes into the possession of Mahaska or any Mahaska
Representative from third parties who have the right to disclose such
information otherwise than in connection with this Agreement. In the event that
this Agreement is terminated without the Merger having been consummated, Mahaska
shall, and shall cause the Mahaska Representatives to, return promptly to the
Company all such information, which was obtained by Mahaska in written form, in
their possession.

         Section 4.9. Lists of Company Stockholders. Upon Mahaska's request from
time to time, for the purpose of giving effect to the Merger as provided for
herein, the Company shall deliver to Mahaska such lists of the holders of record
of the outstanding Company Stock as of the respective dates which Mahaska shall
designate, and the accuracy of each such list shall be certified by an
authorized officer of the Company.

        Section 4.10. Continuing Effect of Representations and Warranties.
Except as contemplated by this Agreement, each of the parties agrees not to
knowingly enter into, or knowingly agree to enter into, any transaction or
perform, or knowingly agree to perform, any act which would result in any of the
representations or warranties on the part of such party not being true and
correct in all material respects at and as of the time immediately after the
occurrence of any such transaction or event or immediately before the Effective
Time or that would be likely to cause any condition set forth in this Agreement
not to be satisfied or otherwise jeopardize the consummation of the transactions
contemplated hereby.

        Section 4.11. Current Information. During the period from the date
hereof to the Effective Time, the Company will cause one or more of its
representatives to confer on a regular and frequent basis with representatives
of Mahaska and to report the general status of the ongoing operations of the
Company and the Company Subsidiaries. The Company will promptly notify Mahaska
of (i) any material change in the normal course of its business or the business
of any of the Company Subsidiaries or in the operation of its properties or the
properties of any of the Company Subsidiaries; (ii) any complaints,
investigations or hearings (or communications indicating that the same may be
contemplated) of any governmental entity; (iii) the institution or the threat of
material litigation involving the Company or any of the Company Subsidiaries; or
(iv) any event or condition that might reasonably be expected to cause any of
the Company's representations or warranties set forth herein not to be true and
correct in all material respects, or cause the Company not to be in full
compliance with any of its covenants set forth herein, as of the Effective Time.
As used in the preceding sentence, "material litigation" shall mean any case,
arbitration or other adversary proceeding or other matter which would have been
required to be disclosed on Schedule 2.11 pursuant to Section 2.11 hereof if in
existence on the date hereof or in



                                      -37-
<PAGE>   200
respect of which the legal fees and other costs of the Company or any of the
Company Subsidiaries might reasonably be expected to exceed $50,000.00 over the
entire life of such matter. The Company shall also promptly notify Mahaska of
any adverse development involving any matter disclosed on Schedule 2.11 in
response to Section 2.11 hereof which shall occur after the date hereof and
which might reasonably be expected to increase the financial exposure of the
Company or any of the Company Subsidiaries thereof in an amount exceeding
$50,000.00 and in any event the Company shall regularly advise Mahaska of
significant changes in the status of any such matters.

        Section 4.12. Termination Payment. (a) If this Agreement is terminated
pursuant to its terms, other than by both parties pursuant to Section 9.2(a)(i)
hereof, by the Company or Mahaska pursuant to Section 9.2(a)(ii) hereof, by
failure of Mahaska's shareholders' to approve the Merger for any reason or by
the failure of the shareholders of the Company to adopt this Agreement where
prior to the vote by the Company shareholders the Board of Directors of the
Company maintains its favorable recommendation for shareholders to adopt this
Agreement and there was no intervening public announced third party offer to
acquire the Company or the Bank, by Mahaska pursuant to clause (B) or (D) of
Section 9.2(a)(iii), by the Company pursuant to Section 9.2(a)(iv) or by either
party pursuant to Section 9.2(a)(v) hereof, and an Acquisition Event shall occur
within 18 months after the date of such termination, the Company shall pay to
Mahaska within two business days after the occurrence of such Acquisition Event,
by wire transfer of immediately available Federal funds to such account as
Mahaska shall designate, the greater of (i) $500,000.00 and (ii) an amount equal
to the sum of (A) out-of-pocket expenses (and the allocated cost of its in-house
legal and accounting departments) incurred by Mahaska in connection with the
transactions contemplated hereby and (B) 2.5% of the Aggregate Value of the
Acquisition Event.

         (b) For purposes of this Section 4.12, the "Aggregate Value" of any
Acquisition Event shall be the sum of (i) the product of (A) the average
consideration paid or payable per share of Company Common Stock in connection
with such Acquisition Event and (B) the number of such shares of Company Common
Stock outstanding immediately prior to such Acquisition Event plus (ii) the
value of any consideration received or receivable by the Company in exchange for
any shares of its capital stock or other securities in connection with such
Acquisition Event.

         (c) For purposes of this Section 4.12, the term "Acquisition Event"
shall mean any of the following: (i) any person or entity (other than Mahaska or
a parent corporation or subsidiary thereof) shall have acquired pursuant to a
tender offer or otherwise beneficial ownership of shares of the Company Common
Stock representing 25% or more of the outstanding shares of the Company Common
Stock; or (ii) the Company shall have entered into an agreement with any person
or entity (other than Mahaska or a parent corporation or subsidiary thereof) to
(A) effect a merger, consolidation or similar transaction in which the Company
or the Bank is the non-surviving entity, (B) sell, lease or otherwise dispose of
assets of the Company or any Company Subsidiary representing 15% or more of the
consolidated assets of the Company and the Company Subsidiaries, or (C) issue,
sell or otherwise dispose of (including by way of merger, consolidation, share
exchange or any similar transaction) securities representing 10% or more of the
voting power of the Company or the Bank.



                                      -38-
<PAGE>   201

         (d) If the shareholders of Mahaska fail to approve the Merger for any
reason after Mahaska has received an offer from a third party to purchase its
stock or a substantial portion of its assets through tender offer, merger, or
otherwise (the "Offer") and the Offer is approved by Mahaska's Board of
Directors, Mahaska shall pay to the Company upon consummation of the transaction
resulting from the Offer, the amount of $500,000 by wire transfer of immediately
available federal funds to such account as the Company shall designate and also
pay to any Company employees, the amounts that would otherwise be paid on the
date of Closing (as defined herein) to such employees pursuant to the Employment
Contracts referred to in Section 6.12 hereof.

         (e) If the Board of Directors of Mahaska fails to maintain its
favorable recommendation of this Agreement and the Merger to the Mahaska
shareholders or in any manner adversely changes such recommendation or withdraws
such recommendation, and the shareholders of Mahaska fail to approve the Merger,
and a Mahaska Acquisition Event (as hereinafter defined) shall occur within 18
months after the termination of this Agreement, Mahaska shall pay to the Company
within two days after the occurrence of such Mahaska Acquisition Event, by wire
transfer of immediately available federal funds to such account as the Company
shall designate, the amount of $500,000 and Mahaska shall also pay on such date
to any Company employees, the amounts that would have been paid on the date of
Closing under this Agreement to such employees pursuant to Employment Contracts
referred to in Section 6.12 hereof, "Mahaska Acquisition Event" shall have the
same meaning as "Acquisition Event" except Mahaska shall be substituted for the
Company and vice versa and a Mahaska Subsidiary that is a financial institution
shall be substituted for the Bank.

         (f) In the event that a party hereto pursues any remedy against the
other party hereto for damages under Section 9.2(b)(i), it shall not be entitled
to any termination fee pursuant to the provisions of this Section 4.12.

        Section 4.13. Reasonable Efforts. Subject to Section 2.25 hereof, each
of the parties hereto agrees to use all reasonable efforts to take, or cause to
be taken, all action, and to do, or cause to be done, all things necessary,
proper or advisable under and in compliance with applicable laws and regulations
to consummate and make effective the transactions contemplated by this Agreement
as expeditiously as reasonably practicable.

        Section 4.14. Letter of Company's Accountants. The Company shall use all
reasonable efforts to cause to be delivered to Mahaska letters of KPMG Peat
Marwick LLP, the Company's independent auditors, dated a date within two
business days before the date on which the Proxy Statement/Prospectus shall
become effective and two business days before the Closing Date and addressed to
Mahaska, in form and substance reasonably satisfactory to Mahaska, and in scope
and substance consistent with applicable professional standards for letters
delivered by independent public accountants in connection with registration
statements similar to the Proxy Statement/Prospectus.

        Section 4.15. Letter of Mahaska's Accountants. Mahaska shall use all
reasonable efforts to cause to be delivered to the Company letters of KPMG Peat
Marwick LLP, Mahaska's independent auditors, dated a date within two business
days before the date on which the Proxy





                                      -39-
<PAGE>   202
Statement/Prospectus shall become effective and two business days before the
Closing Date and addressed to the Company, in form and substance reasonably
satisfactory to the Company, and in scope and substance consistent with
applicable professional standards for letters delivered by independent public
accountants in connection with registration statements similar to the Proxy
Statement/Prospectus.

        Section 4.16. Affiliates. As soon as practicable after the date of this
Agreement, the Company shall deliver to Mahaska a letter, reviewed by its
counsel, identifying all persons whom the Company believes to be "affiliates" of
the Company for purposes of Rule 145 under the Securities Act or for purposes of
qualifying for pooling of interests accounting treatment for the Merger. The
Company shall use its best efforts to cause each person who is so identified as
an "affiliate" to deliver to Mahaska as soon as practicable thereafter, a
Company Affiliate Agreement, providing that each such person will agree not to
sell, pledge, transfer or otherwise dispose of, or reduce risk with respect to,
any shares of stock of the Company held by such person or any shares of Mahaska
Common Stock to be received by such person in the Merger (i) during the period
commencing 30 days prior to the Effective Time and ending at the time of
publication of financial results covering at least 30 days of combined
operations after the Merger and (ii) at any time, except in compliance with the
applicable provisions of the Securities Act and other applicable laws and
regulations. Prior to the Effective Time, the Company shall amend and supplement
such letter and use its best efforts to cause each additional person who is
identified as an "affiliate" to execute a written agreement as set forth in this
Section 4.16. Mahaska shall use all reasonable efforts to cause each director,
executive officer, and other person who is an "affiliate" (for qualifying the
Merger for pooling-of-interests accounting treatment) of Mahaska, as soon as
practicable after the date of this Agreement, execute and deliver a written
agreement (a "Mahaska Affiliate Agreement"), under which such affiliate agrees
not to sell, pledge, transfer, or otherwise dispose of, or reduce risk with
respect to, his or her Mahaska Common Stock during any period that any such
action would, under general accepted accounting principles or the rules,
regulations, or interpretations of the SEC or its staff, disqualify the Merger
for pooling-of-interests for accounting purposes. For the benefit of the
affiliates of the Company, Mahaska shall publish at the earliest opportunity,
but not later than sixty (60) days after the Effective Time, combined financial
results covering the first thirty (30) days after the Effective Time so as to
permit affiliates of the Company and Mahaska to sell shares of Mahaska Common
Stock immediately after such publication under the rules applicable to pooling
of interests accounting treatment.

        Section 4.17. Company Accruals and Reserves. Immediately prior to the
Effective Time, the Company shall, to the extent consistent with generally
accepted accounting principles and the accounting rules, regulations and
interpretations of the SEC and its staff, modify and change its loan, accrual
and reserve policies and practices (including loan classifications, increase the
Company's allowance for loan losses by $400,000.00 plus the "Year End Due
Diligence Amount" over the amount set forth on the Disclosure Statement as of
September 18, 1998, levels of other reserves and accruals and asset disposition
strategies to (i) reflect Mahaska's plans with respect to the conduct of the
Company's business following the Merger and (ii) make adequate provision for the
costs and expenses relating thereto) so as to be applied consistently on a
mutually satisfactory basis with those of Mahaska; provided, however, that the
Company shall not be obligated to take




                                      -40-
<PAGE>   203
in any respect any such action pursuant to this Section 4.17 unless and until
Mahaska acknowledges that all conditions to its obligation to consummate the
Merger have been satisfied.

        Section 4.18. Benefit Plans. (a) Prior to the Effective Time, the
Company and each Company Subsidiary as the sponsoring employer under those
employee welfare benefit plans, employee pension benefit plans, fringe benefit
arrangements and all other benefit programs (collectively, the "Company Plans")
with respect to which the Company or any of its Subsidiaries is a sponsoring
employer immediately prior to the Effective Time, shall adopt resolutions to
cancel and terminate all Company Plans except those set forth on Schedule
4.18(a), effective as of the Effective Time so long as vested rights and
benefits are not disturbed. Except as set forth on Schedule 4.18(a) or expressly
contemplated by a separate agreement entered into by the Company and Mahaska on
the date hereof, each Company Plan shall be cancelled and terminated by the
Company or an applicable Company Subsidiary prior to the Effective Time without
any liability or obligation of Mahaska or its subsidiaries hereafter.

         (b) At or as promptly as practicable after the Effective Time, Mahaska
shall provide, or cause an appropriate Mahaska Subsidiary to provide, as
eligible in accordance with such plans, to each employee of the Company, and its
wholly-owned Subsidiaries as of the Effective Time ("Company Employees") the
opportunity to participate in each employee benefit and welfare plan (including
but not limited to employee welfare benefit plans, employee pension benefit
plans and fringe benefit arrangements) maintained by Mahaska or an appropriate
Mahaska Subsidiary, whichever is applicable, for similarly-situated employees
provided that with respect to such plans maintained by Mahaska or a Mahaska
Subsidiary, whichever is applicable, Company Employees shall be given full
credit for their service with the Company and its Subsidiaries in determining
participation in, eligibility for and vesting in benefits thereunder, and only
with respect to severance and vacation plans, accrual of benefits; provided
further, that except as specifically set forth in Section 4.18(c) hereinbelow
Company Employees may be subject to any waiting periods or preexisting condition
exclusions under the group health plan of Mahaska or any applicable Mahaska
Subsidiary to the extent that such periods are longer or restrictions impose a
greater limitation than the periods or limitations imposed under the applicable
group health plan of the Company or an applicable Company Subsidiary; and
provided further, that to the extent that the initial period of coverage for
Company Employees under any plan of Mahaska or a Mahaska Subsidiary, whichever
is applicable, that is an employee welfare benefit plan is not a full 12-month
period of coverage, Company Employees shall be given credit under the applicable
welfare plan for any deductibles and co-insurance payments made by such Company
Employees under the corresponding welfare plan of the Company or an applicable
Company Subsidiary during the balance of such 12-month period of coverage.
Nothing in the preceding sentence shall obligate Mahaska or any Mahaska
Subsidiary to provide or cause to be provided any duplicative or equivalent
benefits as those provided under any Company Plan that is continued by Mahaska
or a Mahaska Subsidiary. Moreover, this subsection 4.18(b) shall not constitute
a contract of employment or create any rights of a Company Employee to be
retained in employment at Mahaska or any Mahaska Subsidiary.

         (c) Any separate agreement entered into by the Company and Mahaska on
the date hereof relating to employee or director benefits is incorporated herein
by reference and shall be deemed a part of this Agreement.



                                      -41-
<PAGE>   204
        Section 4.19. Directors' and Officers' Indemnification Insurance.
Mahaska agrees that the Merger shall not affect or diminish any of the Company's
or the Company Subsidiaries' duties and obligations of indemnification existing
immediately prior to the Effective Time in favor of the directors, officers,
employees and agents of the Company or the Company Subsidiaries arising by
virtue of the Certificate, Charter or Bylaws of the Company or the Company
Subsidiaries in the form in effect at the date of this Agreement or arising by
operation of law, and such duties and obligations shall continue in full force
and effect for so long as they would (but for the Merger) otherwise survive and
continue in full force and effect, provided however, the Company shall take all
action required by Mahaska prior to the Effective Time to put in place a "tail
coverage" policy or similar policy with its present liability insurer. All
provisions for indemnification and limitation of liability now existing in favor
of the directors or officers of the Company, or the Company Subsidiaries, as
provided by law or regulation or in their respective Certificate of
Incorporation or Charter shall survive the Merger, shall be assumed by Mahaska
and shall continue in full force and effect with respect to acts or omissions
occurring prior to the Effective Time for a period of three years thereafter or
in the case of matters occurring prior to the Effective Time for a period of
three years thereafter or in the case of matters occurring prior to the
Effective Time which have not been resolved prior to the third anniversary of
the Effective Time, until such matters are finally resolved. To the extent
permitted by law, its Articles of Incorporation and By-laws, Mahaska shall
advance expenses in connection with the foregoing indemnification. The
indemnified persons under this Section 4.19 shall be third party beneficiaries
of the provisions of this Section 4.19.

        Section 4.20. Dividend Coordination. After February 17, 1999, the Board
of Directors of the Company shall cause its regular quarterly dividend record
dates and payment dates for Company Common Stock to be the same as Mahaska's
regular quarterly dividend record dates and payment dates for Mahaska Common
Stock (e.g., the Company shall move its next dividend record dates from May 5,
1999 and August 4, 1999 to June 8, 1999 and September 8, 1999, and payment dates
from May 19, 1999, and August 18, 1999, to June 15, 1999 and September 15, 1999,
respectively), and the Company shall not thereafter change its regular dividend
payment dates and record dates.

        Section 4.21. Access and Information. Mahaska shall, and shall cause
each Mahaska Subsidiary to afford to the Company, its directors, officers,
employees, accountants, counsel and other representatives (hereinafter referred
to as the "Company Representatives") access to the properties, assets, books,
contracts, returns, reports and records of Mahaska and the Mahaska subsidiaries
and Mahaska shall, and shall cause its Subsidiaries to, furnish to the Company
such other information concerning the respective businesses, properties and
personnel of Mahaska and each of its Subsidiaries as the Company may reasonably
request. The Company shall keep confidential, and shall cause the Company
Representatives to keep confidential, any such information so obtained from
Mahaska and its Subsidiaries; provided, however, that the foregoing restriction
shall not apply to any such information which is or comes into the public domain
otherwise than as a result of a breach of the provisions of this Section, was in
the possession of the Company or any Company Representative prior to the
negotiations with Mahaska relating to this Agreement or at any time comes into
the possession of the Company or any Company Representative from third parties
who have the right to disclose such information otherwise than in connection
with this Agreement. In the event that this Agreement is terminated without the





                                      -42-
<PAGE>   205
Merger having been consummated, the Company shall, and shall cause the Company
Representatives to, return promptly to Mahaska all such information, which was
obtained by the Company in written form, in their possession.

        Section 4.22. Current Information. During the period from the date
hereof to the Effective Time, Mahaska will cause one or more of its
representatives to confer on a regular and frequent basis with representatives
of the Company and to report the general status of the ongoing operations of
Mahaska and its subsidiaries. Mahaska will promptly notify the Company of (i)
any material change in its business or the business of any of its Subsidiaries
or in the operation of its properties or the properties of any of its
Subsidiaries; (ii) any complaints, investigations or hearings (or communications
indicating that the same may be contemplated) of any governmental entity; (iii)
the institution or the threat of material litigation involving Mahaska or any of
its Subsidiaries; or (iv) any event or condition that might reasonably be
expected to cause any of Mahaska's representations or warranties set forth
herein not to be true and correct in all material respects, or cause Mahaska not
to be in full compliance with any of its covenants set forth herein, as of the
Effective Time.


                                    ARTICLE V


                     CONDITIONS PRECEDENT TO OBLIGATIONS OF
                             MAHASKA AND THE COMPANY

         The obligations of Mahaska and the Company to effect the Merger are
subject to the satisfaction of the following conditions precedent:

         Section 5.1. Company Stockholder Approval. This Agreement and the
Merger shall have been duly approved and adopted by the requisite vote of the
stockholders of Mahaska and the shareholders of the Company under applicable
law.

         Section 5.2. Regulatory Approvals and Legal Requirements. All approvals
and consents required by law to be received in connection with the Merger,
including (without limitation) the approvals of the FRB, the Commissioner, and
the OTS referred to in Section 4.1 hereof, shall have been received, without the
imposition of any non-standard regulatory conditions that would be unduly
burdensome to the Surviving Corporation and such approvals and consents shall be
in effect, and all conditions or requirements prescribed by any such approval or
consent (or by law in connection therewith) shall have been satisfied. All other
requirements prescribed by law which are necessary to the lawful consummation of
the Merger shall have been satisfied.

         Section 5.3. Securities Act Registration, Blue Sky Registration or
Exemption and Nasdaq Listing. The shares of Mahaska Common Stock to be issued to
the Company's shareholders pursuant to this Agreement shall have been registered
with the SEC under the Securities Act by means of an effective registration
statement, shall have been registered under or shall be exempt from registration
under all applicable state securities or blue sky laws, and shall have been
approved for listing, upon official notice of issuance, on Nasdaq.



                                      -43-
<PAGE>   206
         Section 5.4. Pooling of Interests Opinion and Tax Opinion. Mahaska and
the Company shall have received opinions from KPMG Peat Marwick LLP, in form and
substance satisfactory to both parties, with respect to pooling of interests
accounting treatment and tax-free reorganization federal taxation treatment,
which opinion shall be effective and shall not have been withdrawn or modified
in any material respect.


                                   ARTICLE VI


                  CONDITIONS PRECEDENT TO OBLIGATION OF MAHASKA

         The obligation of Mahaska to effect the Merger is subject to the
satisfaction of the following further conditions precedent, unless waived in
writing by Mahaska:

         Section 6.1. Representations, Warranties and Covenants. The
representations and warranties of the Company contained in Article II of this
Agreement shall be true and accurate in all material respects as of the date
hereof and, except as set forth in an Updated Disclosure Statement or as
otherwise contemplated by this Agreement, as of the time immediately prior to
the Effective Time as though made on and as of such time, and the Company shall
have duly performed and complied with, in all material respects, all agreements,
covenants and conditions required by this Agreement to be performed or complied
with by it. The Company shall have delivered to Mahaska a certificate dated the
day of the Effective Time and signed by an authorized officer of the Company to
the effect set forth in the first sentence of this Section.

         Section 6.2. Adverse Changes. There shall have been no changes after
December 31, 1997, in the results of operations, condition (financial or
otherwise), properties, assets or business of the Company or any of the Company
Subsidiaries, which has resulted in or is expected to result in a Material
Adverse Effect on the Company and the Company Subsidiaries, except for any such
change that is solely attributable to a change, following the date of this
Agreement, due to conforming reporting, or in the laws or economic conditions
affecting the banking industry as a whole. The Company shall have delivered to
Mahaska a certificate dated the day of the Effective Time and signed by an
authorized officer of the Company to the effect set forth in the first sentence
of this Section.

         Section 6.3. Litigation. No litigation, proceeding or investigation
shall be pending or threatened, and no order, notice or regulation of any court
or governmental agency shall be in effect with respect to the Company or any
Company Subsidiary, which restrains or prohibits, or which seeks to restrain or
prohibit or obtain damages or other relief in connection with or in any way
relating to, the consummation of the Merger.

         Section 6.4. Additional Due Diligence Period. The parties hereto
acknowledge that, Mahaska shall have the opportunity to complete its due
diligence review of the Company and the Company Subsidiaries year end loan
files. Mahaska will initiate a pre-acquisition investigation and review of the
year end loan files of the Company and the Company Subsidiaries on March 1,
1999, and will complete such pre-acquisition investigation during the 20-day
period following such date (hereinafter said 20-day period is referred to as the
"Year End Loan File Due Diligence




                                      -44-
<PAGE>   207
Period"). In the event that such pre-acquisition investigation and review
discloses any matter (including, without limitation, any matter existing on or
prior to the date of this Agreement), which (in Mahaska's opinion) is
inconsistent in any material respect with any of the representations and
warranties of the Company contained in this Agreement or might materially and
adversely affect either the reasonably expected financial or business benefits
to Mahaska of the Merger or the results of operations, condition (financial or
otherwise) or business of the Company, the Bank or the Surviving Corporation,
Mahaska may elect to require the Company to increase its Loan Loss Reserves by
the "Year End Due Diligence Amount," in its reasonable discretion, immediately
prior to Closing and after all conditions in Articles V-VII have been satisfied
or waived, provided, however, such adjustment shall constitute a "conforming
reporting change" pursuant to Section 6.2.

         Section 6.5. Dissenting Company Stock. The aggregate number of shares
of Dissenting Company Stock shall not exceed eight (8%) of the Company Common
Stock outstanding (assuming all Company stock options have been converted)
immediately prior to the Effective Time. The Company shall have delivered to
Mahaska a certificate dated the day of the Effective Time and signed by an
authorized officer of the Company to the effect set forth in the first sentence
of this Section.

         Section 6.6. Accountants' Letters. Mahaska shall have received the
accountants' letters contemplated by Section 4.15 hereof.

         Section 6.7. Environmental Assessments. Mahaska shall have received the
Environmental Assessments required to be delivered pursuant to Section 2.9(f)
hereof in form and substance reasonably satisfactory to Mahaska.

         Section 6.8. Opinion of the Company's Counsel. Mahaska shall have
received the opinion of Silver, Freedman & Taff, L.L.P., counsel to the Company,
dated the day of the Effective Time, addressed to Mahaska and substantially to
the effect set forth in Exhibit C attached hereto and hereby made a part hereof.

         Section 6.9. Legal Matters. All legal matters in connection with this
Agreement and the Merger shall have been approved by counsel for Mahaska, and
there shall have been furnished to such counsel by the Company certified copies
of such corporate records of the Company and each of the Company Subsidiaries
and copies of such other documents as such counsel may reasonably have requested
for such purpose.

         Section 6.10. Updated Disclosure Statement. The Company shall have
delivered to Mahaska immediately prior to the Effective Time an updated
Disclosure Statement which clearly indicates all changes in the information that
was originally contained therein and on any Schedule hereto and which contains
such information as shall be necessary to make all of the representations and
warranties of the Company true and accurate as of the time immediately prior to
the Effective Time, and which updated Disclosure Statement and Schedules does
not disclose any new information which Mahaska determines in good faith has
resulted in or is expected to result in a Material Adverse Effect on the Company
and the Company Subsidiaries.



                                      -45-
<PAGE>   208
        Section 6.11. Nonperformance and Materially Impaired Assets. The
aggregate amount of all Non-Performing and Materially Impaired Assets on the
books of the Company and the Company Subsidiaries shall not exceed 2.0% of the
gross amount of all loans on the books of the Company and the Company
Subsidiaries.

        Section 6.12. Employment Agreements. A Mahaska Subsidiary shall have
entered into employment agreements satisfactory to Mahaska in the form of
Exhibit D attached hereto and hereby made a part hereof, with such of the
employees of the Company and the Company Subsidiaries who shall have been
designated by Mahaska, who shall have cancelled and terminated their current
employment agreements.

        Section 6.13. Affiliate Agreements. Mahaska shall have received from
each person who has been identified by the Company to Mahaska as an "affiliate,"
pursuant to Section 4.16 hereof, a signed "Affiliates" agreement as contemplated
by such Section.

        Section 6.14. Fairness Opinion. Howe Barnes Investments, Inc. shall have
delivered to the Board of Directors of Mahaska, as of the date of this
Agreement, its opinion to the effect that the consideration to be received in
the Merger is fair, from a financial point of view, to the stockholders of
Mahaska, and such opinion shall not have been withdrawn, amended or modified in
any material respect at or prior to the Closing.

        Section 6.15. Company Costs Paid. The Company shall have delivered to
Mahaska a certificate dated the day of the Effective Time and signed by an
authorized officer of the Company to the effect that all transaction costs of
the Company described in Section 10.3 herein, including, but not limited to, its
attorneys, investment bankers and accountants has been paid in full without
liability or obligation to Mahaska or its Subsidiaries.


                                   ARTICLE VII


                CONDITIONS PRECEDENT TO OBLIGATION OF THE COMPANY

         The obligation of the Company to effect the Merger is subject to the
satisfaction of the following further conditions precedent, unless waived in
writing by the Company:

         Section 7.1. Representations, Warranties and Covenants. The
representations and warranties of Mahaska contained in Article III of this
Agreement shall be true in all material respects as of the date hereof and,
except as otherwise contemplated by this Agreement, as of the time immediately
prior to the Effective Time as though made on and as of such time, and Mahaska
shall have duly performed and complied with, in all material respects, all
agreements, covenants and conditions required by this Agreement to be performed
or complied with by it. Mahaska shall have delivered to the Company a
certificate dated the day of the Effective Time and signed by an authorized
officer of Mahaska to the effect set forth in the first sentence of this
Section.



                                      -46-
<PAGE>   209
         Section 7.2. Opinion of Counsel to Mahaska. The Company shall have
received the opinion of Chapman and Cutler, counsel to Mahaska, dated the day of
the Effective Time, addressed to the Company and substantially to the effect set
forth in Exhibit E attached hereto.

         Section 7.3. Accountants' Letters. The Company shall have received the
accountants' letters contemplated by Section 4.16 hereof.

         Section 7.4. Legal Matters. All legal matters in connection with this
Agreement and the Merger shall have been approved by counsel for the Company,
and there shall have been furnished to such counsel by Mahaska certified copies
of such corporate records of Mahaska and copies of such other documents as such
counsel may reasonably have requested for such purpose.

         Section 7.5.    Reserved.

         Section 7.6. Fairness Opinion. Charles Webb & Company shall have
delivered to the Board of Directors of the Company as of the date of this
Agreement, its opinion to the effect that the consideration to be received in
the Merger is fair, from a financial point of view, to the stockholders of the
Company, and such opinion shall not have been withdrawn, amended or modified in
any material respect at or prior to the Closing.

         Section 7.7. Adverse Changes. There shall have been no changes after
December 31, 1997, in the results of operations, condition (financial or
otherwise), properties, assets or business of Mahaska or any of the Mahaska
Subsidiaries, which has resulted in or is expected to result in a Material
Adverse Effect on Mahaska and the Mahaska Subsidiaries, except for any such
change that is solely attributable to a change, following the date of this
Agreement, due to conforming reporting, or in the laws or economic conditions
affecting the banking industry as a whole. Mahaska shall have delivered to the
Company a certificate dated the day of the Effective Time and signed by an
authorized officer of Mahaska to the effect set forth in the first sentence of
this Section.

         Section 7.8. Litigation. No litigation, proceeding or investigation
shall be pending or threatened, and no order, notice or regulation of any court
or governmental agency shall be in effect with respect to Mahaska or any Mahaska
Subsidiary, which restrains or prohibits, or which seeks to restrain or prohibit
or obtain damages or other relief in connection with or in any way relating to,
the consummation of the Merger.


                                  ARTICLE VIII


                                     CLOSING

         Section 8.1. Date, Time and Place of Closing. The closing in respect of
the Merger (herein referred to as the "Closing") shall be held at the offices of
Chapman and Cutler, 111 West Monroe Street, Chicago, Illinois, at 9:00 A.M.,
Chicago time, on such date, not later than the last day of the month following
the satisfaction or waiver of all conditions to closing set forth in Articles V,
VI and VII, as Mahaska shall designate by at least ten days' prior written
notice to the



                                      -47-
<PAGE>   210
Company, which date (unless otherwise mutually agreed by Mahaska and the
Company) shall be the day of the Effective Time.

         Section 8.2. Deliveries of Documents. At the Closing, the certificates
and other documents required to be delivered by this Agreement shall be
delivered.

         Section 8.3. Merger to Be Made Effective. At the Closing, subject to
the terms and conditions of this Agreement, Mahaska and the Company shall
instruct their respective representatives to make or confirm such filings
(including, without limitation, the filing with the Secretary of State of the
State of Iowa of the Articles of Merger, the filing with the Secretary of State
of the State of Delaware of the Certificate of Merger, each properly executed on
behalf of Mahaska and the Company and otherwise in the form contemplated by the
Delaware General Corporation Law and the Iowa Act), and to take all such other
actions, as shall be required to give effect to the Merger.


                                   ARTICLE IX


                            AMENDMENT AND TERMINATION

         Section 9.1. Amendment. This Agreement may be amended by the parties
hereto, with the approval of their respective Boards of Directors, at any time
prior to the Effective Time, whether before or after approval hereof by the
shareholders of Mahaska or the shareholders of the Company, but, after such
approval by the shareholders of Mahaska and the Company, no amendment shall be
made without the further approval of such shareholders which (i) alters or
changes the amount or kind of consideration to be received by the shareholders
of the Company in exchange for or on conversion of all or any of the shares of
the capital stock of the Company as a result of the Merger; (ii) alters or
changes any term of the certificate of incorporation of the Surviving
Corporation provided for by this Agreement; or (iii) adversely affects such
shareholders (or, in the case of the Company's shareholders, the tax treatment
of the Merger). This Agreement may not be amended except by an instrument in
writing signed on behalf of each of the parties hereto.

         Section 9.2. Termination. (a) This Agreement may be terminated at any
time prior to the Effective Time, whether before or after approval of this
Agreement by Mahaska or the stockholders of the Company:

                  (i) by mutual consent in writing of Mahaska and the Company
         (with the approval of their respective Boards of Directors); or

                  (ii) by Mahaska (with the approval of its Board of Directors)
         or by the Company (with the approval of its Board of Directors), by
         giving written notice of such termination to the other party if, upon
         the taking of the vote of the shareholders of the Company or Mahaska
         contemplated by Sections 4.2 and 4.4 hereof, the required approval of
         such shareholders shall not be obtained; or



                                      -48-
<PAGE>   211

                 (iii) by Mahaska (with the approval of its Board of Directors),
         by giving written notice of such termination to the Company, (A) if
         there has been (I) a material breach of any agreement herein on the
         part of the Company which has not been cured or adequate assurance of
         cure given, in either case within five business days following notice
         of such breach from Mahaska, or (II) a material breach of a
         representation or warranty of the Company herein which, in the opinion
         of Mahaska, by its nature cannot be cured within 30 days, (B) if
         Mahaska determines at any time that any regulatory approval or consent
         required by law to be received in connection with the Merger is
         unlikely to be received or is unlikely to be received in time to permit
         the lawful consummation of the Merger by the date specified in Section
         9.2(a)(vi) hereof or (C) if any acquisition or purchase of all or a
         substantial portion of the assets of, or a substantial equity interest
         in, the Company or the Bank, or any merger, consolidation or other
         business combination with the Company or the Bank, other than as
         contemplated by this Agreement, or any tender or exchange offer
         intended to effect any such transaction, shall have been proposed (and
         such proposal is not opposed in writing by the Company within two
         business days after the Company or the Bank shall have first received
         or become aware of such proposal, pursuant to a resolution authorizing
         and directing opposition to such proposal duly adopted by the Company's
         Board of Directors, or the Company or its Board of Directors at any
         time shall cease to oppose such proposal or shall take, or permit the
         Bank to take, any action which is not consistent with opposition to
         such proposal) or shall have been publicly announced, commenced, agreed
         to or consummated or (D) if there shall have occurred or been proposed,
         after the date of this Agreement, any change in any law, rule or
         regulation, or after the date of this Agreement there shall have been
         any decision or action by any court, government or governmental agency
         (including, without limitation, any bank regulatory authority) that
         could reasonably be expected to prevent or materially delay
         consummation of the Merger or that could reasonably be expected to have
         a Material Adverse Effect on the prospects of the Company, the Bank or
         the Surviving Corporation; or

                  (iv) by the Company (with the approval of its Board of
         Directors), by giving written notice of such termination to Mahaska, if
         there has been (A) a material breach of any agreement herein on the
         part of Mahaska which has not been cured or adequate assurance of cure
         given, in either case within five business days following notice of
         such breach from the Company, or (B) a material breach of a
         representation or warranty of Mahaska herein which, in the opinion of
         the Company, by its nature cannot be cured within 30 days; or

                   (v) by Mahaska (with the approval of its Board of Directors)
         or by the Company (with the approval of its Board of Directors), by
         giving written notice of such termination to the other party, if the
         Merger shall not have been consummated on or before September 30, 1999;
         provided, however, that a party that is in breach of any of any of the
         terms of this Agreement or any of its obligations hereunder may not
         exercise a right of termination under this subsection.

         (b) If this Agreement is properly terminated pursuant to Section
9.2(a), no party to this Agreement shall have any further liability hereunder of
any nature whatsoever to the other party hereto; provided, however, that,
notwithstanding the foregoing, (i) this Section 9.2(b) shall not





                                      -49-
<PAGE>   212
preclude liability from attaching to a party who has caused the termination
hereof by intentional breach of a representation of warranty, a willful act or a
willful failure to act in violation of the terms and provisions hereof, and (ii)
termination of this Agreement shall not terminate or affect the agreements of
the parties contained in this Section 9.2(b), in Sections 4.8 and 4.21 hereof
(with respect to confidentiality), in Section 4.12 (with respect to a
termination payment), or in Section 10.3 hereof (with respect to the payment of
certain expenses), the provisions of all of which Sections shall survive any
termination of this Agreement. Notwithstanding anything contained herein to the
contrary, the parties hereto agree that irreparable damage will occur in the
event that a party breaches any of its obligations, duties, covenants and
agreements contained herein. It is accordingly agreed that the parties shall be
entitled to an injunction or injunctions to prevent breaches or threatened
breaches of this Agreement and to enforce specifically the terms and provisions
of this Agreement in any court of the United States or any state having
jurisdiction, this being in addition to any other remedy to which they are
entitled by law or in equity.


                                    ARTICLE X


                               GENERAL PROVISIONS

        Section 10.1. Survival of Representations, Warranties and Agreements.
The agreements contained in Article I and Sections 4.18, 4.19 and 10.4 hereof
(but only to the extent such agreements relate to actions to be taken or matters
to occur after the Effective Time) shall survive the Merger. All other
representations, warranties and agreements contained in this Agreement and in
any certificate or other document delivered pursuant to this Agreement (other
than the Certificate of Merger) shall not survive the Merger.

        Section 10.2. Notices. Each notice, request, demand, approval or other
communication which may be or is required to be given under this Agreement shall
be in writing and shall be deemed to have been properly given when delivered
personally at the address set forth below for the intended party during normal
business hours at such address, when sent by facsimile or other electronic
transmission to the respective facsimile transmission numbers of the parties set
forth below with telephone confirmation of receipt, or when sent by recognized
overnight courier or by the United States registered or certified mail, return
receipt requested, postage prepaid, addressed as follows:

       (a)      if to Mahaska, at:             Mahaska Investment Company
                                               222 First Avenue East
                                               Oskaloosa, Iowa  52577
                                               Attention:  Charles S. Howard

                with a copy to:                Matthew C. Boba, Esq.
                                               Chapman and Cutler
                                               111 West Monroe Street
                                               Chicago, Illinois  60603



                                      -50-
<PAGE>   213
       (b)      if to the Company, at:         Midwest Bancshares, Inc.
                                               3225 Division Street
                                               Burlington, Iowa  52601
                                               Attention:  William D. Hassel

                with a copy to:                Martin L. Meyrowitz, P.C.
                                               Silver, Freedman & Taff, L.L.P.
                                               1100 New York Avenue N.W.
                                               Washington, DC  20005

Notices shall be given to such other addressee or address, or both, or by way of
such other facsimile transmission number, as a particular party may from time to
time designate by written notice to the other party hereto. Each notice,
request, demand, approval or other communication which is sent in accordance
with this Section shall be deemed given and received for all purposes of this
Agreement as of two business days after the date of deposit thereof for mailing
in a duly constituted United States post office or branch thereof, one business
day after deposit with a recognized overnight courier service or upon
confirmation of receipt of any facsimile transmission. Notice given to a party
hereto by any other method shall only be deemed to be given and received when
actually received in writing by such party.

        Section 10.3. Expenses and Certain Required Accruals. Whether or not the
Merger is consummated, each of Mahaska and the Company shall, and the Company
shall cause each of the Company Subsidiaries to, bear its own legal, accounting,
investment banking (including without limitation Charles Webb & Company), and
other expenses incurred in connection with this Agreement and the Merger. Such
expenses by the Company (excluding Charles Webb & Company) should not exceed
$300,000.00 in the aggregate. All filing and related fees to be paid to the SEC
and any regulatory authority in connection with the transactions contemplated by
this Agreement shall be borne by Mahaska.

        Section 10.4. Further Assurances. From time to time after the Effective
Time, as and when requested by the Surviving Corporation and to the extent
permitted by law, the officers and directors of each of Mahaska and the Company
last in office shall execute and deliver such assignments, deeds and other
instruments and shall take or cause to be taken such further or other actions as
shall be necessary in order to vest or perfect in or to confirm of record or
otherwise to the Surviving Corporation title to and possession of, all of the
assets, rights, franchises and interests of each of Mahaska and the Company in
and to every type of property (real, personal and mixed) and things in action,
and otherwise to carry out the intent and purposes of this Agreement, and the
proper officers and directors of the Surviving Corporation are fully authorized
to take any and all such actions in the name of Mahaska or the Company or
otherwise.

        Section 10.5. Publicity. Neither Mahaska nor the Company shall, nor
shall either of them permit its directors, officers, employees or agents to,
issue or cause the publication of any press release or other announcement with
respect to this Agreement or the Merger or otherwise make any disclosures
relating thereto to the press or any third party without the prior consent of
the other party, which consent shall not be unreasonably withheld; provided,
however, that such consent shall not be required where such release,
announcement or disclosure is required by




                                      -51-
<PAGE>   214
applicable law or the rules or regulations of a securities exchange, other
self-regulatory authority or governmental agency (including, without limitation,
the rules and regulations of bank regulatory authorities with respect to the
publication of notice of the Merger in connection with the applications for
required approvals thereof).

        Section 10.6. Waivers. No waiver by any of the parties to this Agreement
of any condition, term or provision hereof shall be valid unless set forth in an
instrument in writing signed on behalf of such party, and no such waiver shall
be deemed a waiver of any preceding or subsequent breach of the same or any
other condition, term or provision of this Agreement.

        Section 10.7. Entire Agreement and Binding Effect. This Agreement (i)
constitutes the entire agreement and supersedes all other prior agreements and
understandings, both written and oral, between the parties hereto with respect
to the subject matter hereof; (ii) shall be binding upon and inure for the
benefit of Mahaska and the Company and their respective successors and except as
provided in Section 4.19 or in the separate letter referenced to in Section
4.18(c), is not intended to confer upon any other person any rights or remedies
hereunder; and (iii) shall not be assigned or transferred by operation of law or
otherwise.

         Section 10.8. Governing Law. This Agreement shall in all respects be
governed by and construed in accordance with the laws of the State of Iowa.

        Section 10.9. Consent to Jurisdiction. Each of the parties hereby
submits to the exclusive jurisdiction of the Chancery Court of the State of Iowa
and the Federal courts of the United States of America located in Iowa in
respect of the transactions contemplated by this Agreement, and hereby waives,
and agrees not to assert, as a defense in any action, suit or proceeding
involving any of the transactions contemplated by this Agreement, that it is not
subject thereto or that such action, suit or proceeding may not be brought or is
not maintainable in said courts or that this Agreement may not be enforced in or
by said courts or that its property is exempt or immune from execution, that the
suit, action or proceeding is brought in an inconvenient forum, or that the
venue of the suit, action or proceeding is improper.

         Section 10.10. Counterparts. This Agreement may be executed in two or
more counterparts, each of which shall be deemed to constitute an original, but
all of which together shall constitute one and the same instrument.

         Section 10.11. Captions. The captions contained in this Agreement are
for reference purposes only and are not part of this Agreement.




                                      -52-
<PAGE>   215


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

                                               MIDWEST BANCSHARES, INC.

Attest:                                        By /s/ William D. Hassel
                                                  ---------------------
                                                  Its President & CEO
                                                  ---------------------
By  Robert D. Maschmann
    ----------------------------------
Its Executive Vice President & CFO
    ----------------------------------

                                               MAHASKA INVESTMENT COMPANY

Attest:                                        By /s/ Charles S. Howard
                                                  -----------------------------
                                                  Its Chairman & President
                                                  -----------------------------
By  David A. Meinert
    ----------------------------------
Its Executive Vice President & CFO
    ----------------------------------



                                      -53-
<PAGE>   216
                                                                     ANNEX II








                                February 2, 1999



Midwest Bancshares, Inc.
3225 Division Street
Burlington, IA 52601

Ladies and Gentlemen:

         This letter is intended to supplement the Agreement and Plan of Merger
by and between Mahaska Investment Company ("Mahaska") and Midwest Bancshares,
Inc. ("Company") dated of even date herewith (the "Merger Agreement") and sets
out the agreements of the parties relating to various issues not fully addressed
in the Merger Agreement. The provisions of this letter agreement are hereby
incorporated into and made part of Section 4.18(c) of the Merger Agreement as if
set forth therein. Capitalized terms used in this letter agreement, not
otherwise defined in this letter agreement, shall have the meanings ascribed to
them in the Merger Agreement. The provisions of this letter agreement shall
survive consummation of the transactions under the Merger Agreement.

         (1) Directors of Bank. The directors of the Bank immediately prior to
the Effective Time together with two members of Mahaska's then current board of
directors, who shall be selected by the Directors of Mahaska, shall be the
directors of the Bank at and after the Effective Time. Each such director of the
Bank will be eligible during his or her term of service as a director of the
Bank to participate in all director compensation plans, including any
non-qualified stock option awards, on the same basis as nonemployee directors of
Mahaska or a Mahaska Subsidiary generally. Mahaska further agrees that such
directors shall be given full credit for their past service with the Bank in
determining participation in, eligibility for and vesting in benefits under the
director compensation plans. Mahaska shall use its best efforts to cause each
such director of the Bank (other than a current member of the Mahaska Board of
Directors) to be re-elected for successive terms so that each such director will
serve for a minimum of three years after the Effective Time.

         (2) Compensation and Benefits for Current Company CEO and CFO. To
maximize the value to be received by Mahaska in the Merger, Mahaska believes it
is essential to retain the services of the current Company CEO and CFO on a
long-term basis in order to integrate operations, to assure customer retention
and customer development, facilitate long-term strategic planning in Burlington,
Iowa and surrounding market area, and to otherwise enhance the acquired
franchise. Accordingly, Mahaska and each of the current Company CEO and CFO
shall on the date hereof enter into employment agreements in the form of Exhibit
D-1 (for the CEO) and Exhibit D-2 (for the CFO) to the Merger Agreement (the
"New Employment Agreements"). The New Employment Agreements shall become
effective at the Effective Time. The Bank shall pay

<PAGE>   217
to each of the current Company CEO and CFO a lump sum cash payment immediately
prior to the Effective Time in the amount of $120,000 and $90,000, respectively,
in exchange for such executives entering into the New Employment Agreements and
thereby relinquishing their economic rights and benefits under their existing
employment agreements with the Bank.


         (3) Salary Continuation Plans. At the Effective Time, or as soon as
thereafter as practicable, Mahaska agrees to establish Salary Continuation Plans
for the current Company CEO and CFO. Such plans will be consistent with and
substantially similar to those currently provided or to be provided to certain
of Mahaska's senior officers. Such plans will provide for full credit for past
service with the Company and the Bank for purposes of participation,
eligibility, vesting and accrual of benefits under the plans, including but not
limited to upon death of the executive the benefits payable shall be paid to the
executive's designated beneficiary. In no event will the annual benefit
commencing at age 55 be no less than $20,000 or at age 65 no less than $50,000
for a period of 10 years for the current CEO, and the annual benefit commencing
at age 65 be no less than $40,000 for a period of 10 years for the current CFO.

         (4) Group Health Plan. At or after the Effective Time, the Company
Employees shall be integrated into the group health plans and cafeteria plan of
Mahaska and the Mahaska Subsidiaries in a manner whereby no Company Employee
shall be subject to any gap in coverage or a pre-existing condition exclusion
for which coverage is available to him or her under the group health plan of the
Company or the Bank immediately prior to the Effective Time. Consistent
herewith, Mahaska shall continue the group health plan of the Company or the
Bank after the Effective Time for those Company Employees who would be subject
to any gap in coverage or pre-existing condition exclusion as described above
until such time as they are not subject to such conditions under the group
health plan to be provided to them by Mahaska or a Mahaska Subsidiary.

         (5) Qualified Plans. (a) Company ESOP. The Company ESOP will be merged
into the Mahaska ESOP at or as soon as practicable after the Effective Time.
Pending the merger of such plans, the Company ESOP shall be maintained, operated
and administered for the exclusive benefit of those participants in the Company
ESOP as of the Effective Time and those former participants or their
beneficiaries who have undistributed account balances in the Company ESOP as of
the Effective Time, in all cases in compliance with ERISA, the Code and all
other applicable laws and regulations. No amendment or change will be made by
Mahaska to the Company ESOP which would adversely affect the rights of
participants and/or their beneficiaries and after the merger of the plans the
vesting schedule currently contained in the Company ESOP shall continue to apply
to the unvested account balances of each participant as of the Effective Time.

         (b) Bank Defined Benefit Pension Plan. This plan shall at the election
of the Company either be (a) frozen as to participation as of the Effective Time
and terminated at or as soon as practicable after the Effective Time; or (b)
continued for a period consisting of the tax year in which the Merger is
consummated and one tax year thereafter for the exclusive benefit of Company
Employees and persons having rights under the plan immediately prior to the
Effective Time, in which case the plan shall be frozen as to participation at
the expiration of the second tax period stated herein and terminated on such
date or as soon thereafter as is practicable. The




                                      -2-
<PAGE>   218
Company shall exercise its election by written notice to Mahaska prior to the
Effective Time. Prior to any termination of the plan, either the Bank or
Mahaska, whichever is applicable, shall cause the plan to be amended to allocate
excess assets on a plan termination basis to those participants in the plan on
the date it is frozen; and in the case where the plan is frozen after the
Effective Time, excess assets shall also be allocated to those persons who were
participants in the plan immediately prior to the Effective Time who are no
longer participants in the plan as of its freeze date, to the extent permitted
by the plan and applicable laws and regulations, including but not limited to,
ERISA and the Code. As soon as practicable after the receipt of a determination
letter for termination from the Internal Revenue Service relating to the
termination of the plan, benefits will be distributed in accordance with the
plan and, to the extent permitted by law, participants or beneficiaries will be
offered the right to roll over their benefits to another qualified plan of
Mahaska or to an eligible individual retirement account.

         (6) Other Benefit Plans. Ninety days after the Effective Time, all
Company Employees will become participants in Mahaska's short-term and long-term
disability plan, group term life insurance plan, and 401(k) plan on a uniform
and nondiscriminatory basis. Company Employees will be given full credit for
prior years of service with the Company and the Company Subsidiaries in
determining participation in, eligibility for and vesting in benefits, to the
extent applicable, in such Mahaska plans.

         Please indicate your agreement with the foregoing by signing one copy
of this letter in the space set forth below.

                                MAHASKA INVESTMENT COMPANY


                                By /s/ Charles S. Howard
                                   ------------------------
                                   Its President and Chief Executive  Officer

         Acknowledged and agreed to this 2nd day of February, 1999.

                                MIDWEST BANCSHARES, INC.


                                By /s/ William D. Hassel
                                   ------------------------
                                   Its President and CEO




                                      -3-
<PAGE>   219
         The undersigned have executed this Letter Agreement for the purpose of
agreeing in their individual capacities to provisions of items 2 and 3 above.

         William D. Hassel, individually


         /s/ William D. Hassel
         ---------------------

Dated: February 2, 1999

         Robert D. Maschmann, individually


         /s/ Robert D. Maschmann
         -----------------------

Dated: February 2, 1999




                                      -4-
<PAGE>   220
                                                                       ANNEX III

                   [HOWE BARNES INVESTMENTS, INC. LETTERHEAD]


                                February 2, 1999


Board of Directors
Mahaska Investment Company
222 First Avenue East
P.O. Box 1104
Oskaloosa, Iowa  52577

Members of the Board:

You have requested our opinion as to the fairness, from a financial point of
view, to the holders of the outstanding shares of common stock of Mahaska
Investment Company ("Mahaska") of the consideration (the "Consideration") to be
paid for the exchange of common shares in the merger (the "Merger") of Midwest
Bancshares, Inc. ("Midwest") with Mahaska, pursuant to the Agreement and Plan
of Merger, dated February 2, 1999 by and between Mahaska and Midwest (the
"Merger Agreement").

Pursuant to the Merger Agreement, Midwest will merge with and into Mahaska, and
Mahaska shall be the surviving corporation in the Merger. Each share of Midwest
common stock outstanding immediately prior to the effective time of the Merger
(other than shares as to which statutory dissenters' appraisal rights have been
exercised) will be converted into and exchanged for one (1) share of Mahaska
common stock. The maximum aggregate number of shares of Mahaska common stock to
be issued as part of the Merger is 1,119,473. The terms of the Merger are more
fully set forth in the Merger Agreement.

For purposes of this opinion and in connection with our review of the proposed
transaction, we have, among other things:

      1. Participated in discussions with representatives of both Mahaska and
         Midwest concerning each company's financial condition, businesses,
         assets, earnings, prospects, and such senior management's views as to
         its future financial performance;

      2. Reviewed the terms of the Merger Agreement;

      3. Reviewed certain publicly available financial statements, both audited
         (where available) and unaudited, and related financial information of
         Mahaska and Midwest, including those included in their respective
         Annual Reports on Form 10-K


<PAGE>   221
Board of Directors
Mahaska Investment Company
Page 2
- --------------------------------------------------------------------------------

         and Form 10-KSB for the past two years and the respective Quarterly
         Reports on Form 10-Q and Form 10-QSB for the periods ended March 31,
         1998, June 30, 1998, and September 30, 1998, as well as other
         internally generated reports relating to asset/liability management,
         asset quality, and so forth;

      4. Reviewed certain financial forecasts and projections of Mahaska and
         Midwest prepared by its management and reviewed publicly available
         information for Mahaska and Midwest;

      5. Discussed and reviewed certain aspects of the past and current
         business operations, financial condition, and future prospects of
         Mahaska and Midwest with certain members of management;

      6. Reviewed reported market prices and historical trading activity of
         Mahaska and Midwest common stock;

      7. Reviewed certain aspects of the financial performance of Mahaska and
         Midwest and compared such financial performance of Mahaska and
         Midwest, together with stock market data relating to Mahaska and
         Midwest common stock, with similar data available for certain other
         financial institutions and certain of their publicly traded
         securities; and

      8. Reviewed certain of the financial terms, to the extent publicly
         available, of certain recent business combinations involving other
         financial institutions.

We have assumed and relied, without independent verification, upon the accuracy
and completeness of all of the financial and other information that has been
provided to us by Mahaska, Midwest, and their respective representatives, and
of the publicly available information that was reviewed by us. We are not
experts in the evaluation of allowances for loan losses and have not
independently verified such allowances, and have relied on and assumed that the
aggregate allowances for loan losses set forth in the balance sheets of each of
Mahaska and Midwest at December 31, 1998 are adequate to cover such losses and
complied fully with applicable law, regulatory policy and sound banking
practice as of the date of such financial statements. We were not retained to
and we did not conduct a physical inspection of any of the properties or
facilities of Mahaska or Midwest, did not make any independent evaluation or
appraisal of the assets, liabilities or prospects of Mahaska or Midwest, were
not furnished with any such evaluation or appraisal, and did not review any
individual credit files. Our opinion is necessarily based on economic, market,
and other conditions as in effect on, and the information made available to us
as of, the date hereof.


<PAGE>   222
Board of Directors
Mahaska Investment Company
Page 3
- --------------------------------------------------------------------------------

Howe Barnes Investments, Inc. ("HBI"), as part of its investment banking
business, is regularly engaged in the valuation of banks and bank holding
companies, thrifts and thrift holding companies, and various other financial
services companies, in connection with mergers and acquisitions, initial and
secondary offerings of securities, and valuations for other purposes. In the
ordinary course of our business HBI acts as a market maker, buying and selling
the common stock of Mahaska for our own account and for the accounts of our
customers. In rendering this fairness opinion, we have acted on behalf of the
Board of Directors of Mahaska and will receive a fee for our services.

HBI's opinion as expressed herein is limited to the fairness, from a financial
point of view, of the consideration to be received by holders of Midwest common
stock in the Merger and does not address Mahaska's underlying business decision
to proceed with the Merger. We have been retained on behalf of the Board of
Directors of Mahaska, and our opinion does not constitute a recommendation to
any holder of Mahaska common stock as to how such holder should vote with
respect to the Merger Agreement at any meeting of holders of Mahaska common
stock.

Subject to the foregoing and based on our experience as investment bankers, our
activities as described above, and other factors we have deemed relevant, we
are of the opinion as of the date hereof that the Consideration is fair, from a
financial point of view, to the holders of Mahaska common stock.


                                    Sincerely,
                                    HOWE BARNES INVESTMENTS, INC.


                                    /s/ DANIEL E. COUGHLIN
                                    -------------------------------
                                    Daniel E. Coughlin, Senior Vice President


<PAGE>   223
                                                                        ANNEX IV
February 2, 1999

Board of Directors
Midwest Bancshares, Inc.
3225 Division Street
Burlington, Iowa 52601

Dear Board of Directors:

You have requested our opinion as an independent investment banking firm
regarding the fairness, from a financial point of view, to the stockholders of
Midwest Bancshares, Inc. ("MWBI" or the "Company"), of the consideration to be
received by such stockholders in the merger (the "Merger") between the Company
and Mahaska Investment Company, ("OSKY"). We have not been requested to opine
as to, and our opinion does not in any manner address, the Company's underlying
business decision to proceed with or effect the Merger.

Pursuant to the Agreement and Plan of Merger, dated February 2, 1999, by and
among the Company and OSKY (the "Agreement"), at the effective time of the
Merger, OSKY will acquire all of the Company's issued and outstanding shares of
common stock. The holders of the Company's common stock will receive in
exchange for each share of Company common stock, shares of OSKY common stock
based on an Exchange Ratio of 1.0 shares of OSKY common stock for each share of
Company common stock.

In addition, the holders of unexercised and outstanding options awarded
pursuant to the Company's Stock Option Plans will receive merger consideration
as described in Section 1.2(d) of the Agreement. The complete terms of the
proposed transaction are described in the Agreement, and this summary is
qualified in its entirety by reference thereto.

Charles Webb & Company, a Division of Keefe, Bruyette & Woods, Inc., as part of
its investment banking business, is regularly engaged in the evaluation of
businesses and securities in connection with mergers and acquisitions,
negotiated underwritings, and distributions of listed and unlisted securities.
We are familiar with the market for common stocks of publicly traded banks,
savings institutions and bank and savings institution holding companies.

In connection with this opinion we reviewed certain financial and other
business data supplied to us by the Company including (i) Annual Reports, Proxy
Statements and Form 10-Ks for the years ended December 31, 1995, 1996 and 1997,
(ii) Form 10-Qs for the quarters ended March 31, 1998, June 30, 1998, September
30, 1998 and preliminary results for the quarter ended December 31, 1998 and
other information we deemed relevant. We discussed with senior management and
the boards of directors of the Company and its wholly owned subsidiary, Midwest
Federal Savings and Loan Association of


<PAGE>   224
Board of Directors
Midwest Bancshares, Inc.
February 2, 1999
Page 2

Eastern Iowa, the current position and prospective outlook for the Company. We
considered historical quotations and the prices of recorded transactions in the
Company's common stock since its initial public offering. We reviewed financial
and stock market data of other savings institutions, particularly in the
midwestern region of the United States, and the financial and structural terms
of several other recent transactions involving mergers and acquisitions of
savings institutions or proposed changes of control of comparably situated
companies.

For OSKY, we reviewed the audited financial statements, 10-k's, and Proxy
Statements for the fiscal years ended December 31, 1997, 1996, and 1995, and
certain other information deemed relevant. We also discussed with senior
management of OSKY, the current position and prospective outlook for OSKY.

For purposes of this opinion we have relied, without independent verification,
on the accuracy and completeness of the material furnished to us by the Company
and OSKY and the material otherwise made available to us, including information
from published sources, and we have not made any independent effort to verify
such data. With respect to the financial information, including forecasts and
asset valuations we received from the Company, we assumed (with your consent)
that they had been reasonably prepared reflecting the best currently available
estimates and judgment of the Company's management. In addition, we have not
made or obtained any independent appraisals or evaluations of the assets or
liabilities, and potential and/or contingent liabilities of the Company or
OSKY. We have further relied on the assurances of management of the Company and
OSKY that they are not aware of any facts that would make such information
inaccurate or misleading. We express no opinion on matters of a legal,
regulatory, tax or accounting nature or the ability of the Merger, as set forth
in the Agreement, to be consummated.

In rendering our opinion, we have assumed that in the course of obtaining the
necessary approvals for the Merger, no restrictions or conditions will be
imposed that would have a material adverse effect on the contemplated benefits
of the Merger to the Company or the ability to consummate the Merger. Our
opinion is based on the market, economic and other relevant considerations as
they exist and can be evaluated on the date hereof.

Consistent with the engagement letter with you, we have acted as financial
advisor to the Company in connection with the Merger and will receive a fee for
such services, a majority of which is contingent upon the consummation of the
Merger. In addition, the Company has agreed to indemnify us for certain
liabilities arising out of our engagement by the Company in connection with the
Merger.


<PAGE>   225
Board of Directors
Midwest Bancshares, Inc.
February 2, 1999
Page 3

Based upon and subject to the foregoing, as outlined in the foregoing
paragraphs and based on such other matters as we considered relevant, it is our
opinion that as of the date hereof, the consideration to be received by the
stockholders of the Company in the Merger is fair, from a financial point of
view, to the stockholders of the Company.

This opinion may not, however, be summarized, excerpted from or otherwise
publicly referred to without our prior written consent, although this opinion
may be included in its entirety in the proxy statement of the Company used to
solicit stockholder approval of the Merger. It is understood that this letter
is directed to the Board of Directors of the Company in its consideration of
the Agreement, and is not intended to be and does not constitute a
recommendation to any stockholder as to how such stockholder should vote with
respect to the Merger.


Very truly yours,

/s/ Charles Webb & Company,
A Division of Keefe, Bruyette & Woods, Inc.

Charles Webb & Company,
A Division of Keefe, Bruyette, & Woods, Inc.


<PAGE>   226


                                                            ANNEX V

                         IOWA Business Corporation Act

                                 DIVISION XIII
                               DISSENTERS' RIGHTS
                                     PART A

490.1301  DEFINITIONS FOR DIVISION XIII - In this division:
1.  "Beneficial shareholder" means the person who is a beneficial owner of
shares held by a nominee as the record shareholder.
2.  "Corporation" means the issuer of the shares held by a dissenter before the
corporate action, or the surviving or acquiring corporation by merger or share
exchange of that issuer.
3.  "Dissenter" means a shareholder who is entitled to dissent from corporate
action under section 490.1302 and who exercises that right when and in the
manner required by sections 490.1320 through 490.1328.
4.  "Fair value", with respect to a dissenter's shares, means the value of the
shares immediately before the effectuation of the corporate action to which the
dissenter objects, excluding any appreciation or depreciation in anticipation
of the corporate action unless exclusion would be inequitable.
5.  "Interest" means interest from the effective date of the corporate action
until the date of payment, at the average rate currently paid by the
corporation on its principal bank loans or, if none, at a rate that is fair and
equitable under all circumstances.
6.  "Record shareholder" means the person in whose name shares are registered
in the records of a corporation or the beneficial owner of shares to the extent
of the rights granted by a nominee certificate on file with a corporation.
7.  "Shareholder" means the record shareholder or the beneficial shareholder.
490.1302  SHAREHOLDER'S RIGHT TO DISSENT.--1. A shareholder is entitled to
dissent from, and obtain payment of the fair value of the shareholder's shares
in the event of, any of the following corporate actions:
     a. Consummation of a plan of merger to which the corporation is a party if
either of the following apply:
     (1) Shareholder approval is required for the merger by section 490.1103 or
the articles of incorporation and the shareholder is entitled to vote on the
merger.
     (2) The corporation is a subsidiary that is merged with its parent under
section 490.1104.
     b. Consummation of a plan of share exchange to which the corporation is a
party as the corporation whose shares will be acquired, if the shareholder is
entitled to vote on the plan.

<PAGE>   227
3-16-98              IOWA BUSINESS CORPORATION ACT                  CORP.--269

     c. Consummation of a sale or exchange of all, or substantially all, of the
property of the corporation other than in the usual and regular course of
business, if the shareholder is entitled to vote on the sale or exchange,
including a sale in dissolution, but not including a sale pursuant to court
order or a sale for cash pursuant to a plan by which all or substantially all of
the net proceeds of the sale will be distributed to the shareholders within one
year after the date of sale. d. An amendment of the articles of incorporation
that materially and adversely affects rights in respect of a dissenter's shares
because it does any or all of the following:
     (1) Alters or abolishes a preferential right of the shares.
     (2) Creates, alters, or abolishes a right in respect of redemption,
including a provision respecting a sinking fund for the redemption or
repurchase, of the shares.
     (3) Alters or abolishes a preemptive right of the holder of the shares to
acquire shares or other securities.
     (4) Excludes or limits the right of the shares to vote on any matter, or to
cumulate votes, other than a limitation by dilution through issuance of shares
or other securities with similar voting rights.
     (5) Reduces the number of shares owned by the shareholder to a fraction of
a share if the fractional share so created is to be acquired for cash under
section 490.604.
     (6) Extends, for the first time after being governed by this chapter, the
period of duration of a corporation organized under chapter 491 or 496A and
existing for a period of years on the day preceding the date the corporation is
first governed by this chapter. e. Any corporate action taken pursuant to a
shareholder vote to the extent the articles of incorporation, bylaws, or a
resolution of the board of directors provides that voting or nonvoting
shareholders are entitled to dissent and obtain payment for their shares.
     2. A shareholder entitled to dissent and obtain payment for the
shareholder's shares under this chapter is not entitled to challenge the
corporate action creating the shareholder's entitlement unless the action is
unlawful or fraudulent with respect to the shareholder or the corporation.


                           DECISIONS UNDER PRIOR LAW
     .1 DISSENTER'S RIGHTS.--Dissenting stockholders remedies are available in
courts of the state of incorporation only. McGhee v General Finance Corp, 84
FSupp 24 (WD Va 1949); Sheridan v American Motors Corp, 132 FSupp 121 (ED Pa
1955).
     Stockholder whose husband voted her stock against a charter amendment
without her written proxy to do so had no rights as a dissenting stockholder.
Robbins v Beatty, 67 NW2d 12 (1954).
     Shareholder's action seeking damages and injunction barring merger between
his target corporation and another corporation was properly dismissed because:
(1) merger was approved by more than the requisite percentage of shareholders
and tender offer that effectuated merger was not coerced and (2) shareholder had
adequate remedy under Iowa appraisal statute if he thought tender price was too
low. Ziskin v Thrall Car Mfg Co, 435 NE2d 1227 (Ill App Ct 1982).

     490.1303 DISSENT BY NOMINEES AND BENEFICIAL OWNERS.--1. A record
shareholder may assert dissenters' rights as to fewer than all the shares
registered in that shareholder's name only if the shareholder dissents with
respect to all shares beneficially owned by any one person and notifies the
corporation in writing of the name and address of each person on whose behalf
the shareholder asserts dissenters' rights. The rights of a partial dissenter
under this subsection are determined as if the shares as to which the
shareholder dissents and the shareholder's other shares were registered in the
names of different shareholders.
     2. A beneficial shareholder may assert dissenters' rights to shares held
on the shareholder's behalf only if the shareholder does both of the following:
     a. Submits to the corporation the record shareholder's written consent to
the dissent not later than the time the beneficial shareholder asserts
dissenters' rights.
     b. Does so with respect to all shares of which the shareholder is the
beneficial shareholder or over which that beneficial shareholder has power to
direct the vote.

                                     PART B

     490.1320 NOTICE OF DISSENTERS' RIGHTS.--1. If proposed corporate action
creating dissenters' rights under section 490.1302 is submitted to a vote at a
shareholders' meeting, the meeting notice must state that shareholders are or
may be entitled to assert dissenters' rights under this part and be accompanied
by a copy of this part.



<PAGE>   228
270 -- Corp.                IOWA Business Corporation Act                3-16-98

     2.   If corporate action creating dissenters' rights under section
490.1302 is taken without a vote of shareholders, the corporation shall notify
in writing all shareholders entitled to assert dissenters' rights that the
action was taken and send then the dissenters' notice described in section
490.1322.

     490.1321  NOTICE OF INTENT TO DEMAND PAYMENT. -- 1.  If proposed corporate
action creating dissenters' rights under section 490.1302 is submitted to a
vote at a shareholders' meeting, a shareholder who wishes to assert dissenters'
rights must do all of the following:

     a.   Deliver to the corporation before the vote is taken written notice of
the shareholder's intent to demand payment for the shareholder's shares if the
proposed action is effectuated.
     b.   Not vote the dissenting shareholder's shares in favor of the proposed
action.

     2.   A shareholder who does not satisfy the requirements of subsection 1,
is not entitled to payment for the shareholder's shares under this part.

     490.1322  DISSENTERS' NOTICE. -- 1.  If proposed corporate action creating
dissenters' rights under section 490.1302 is authorized at a shareholders'
meeting, the corporation shall deliver a written dissenters' notice to all
shareholders who satisfied the requirements of section 490.1321.

     2.   The dissenters' notice must be sent no later than ten days after the
proposed corporate action (1) is authorized at a shareholders' meeting, or, if
the corporate action is taken without a vote of the shareholders, no later than
ten days after the corporate action is taken, and must do all of the following:
     a.   State where the payment demand must be sent and where and when
certificates for certificated shares must be deposited.
     b.   Inform holders of uncertificated shares to what extent transfer of
the shares will be restricted after the payment demand is received.
     c.   Supply a form for demanding payment that includes the date of the
first announcement to news media or to shareholders of the terms of the
proposed corporate action and requires that the person asserting dissenters'
rights certify whether or not the person acquired beneficial ownership of the
shares before that date.
     d.   Set a date by which the corporation must receive the payment demand,
which date shall not be fewer than thirty nor more than sixty days after the
date the (2) dissenters' notice is delivered.
     e.   Be accompanied by a copy of this division. (Last amended by Ch. 211,
L. '91, eff. 7-1-91.)
- -------------------------
     Ch. 211, L. '91, eff. 7-1-91, added matter in italic and deleted  (1)"by
the shareholders was taken" and (2)"subsection 1".

     490.1323  DUTY TO DEMAND PAYMENT. -- 1.   A shareholder sent a dissenter's
notice described in section 490.1322 must demand payment, certify whether the
shareholder acquired beneficial ownership of the shares before the date required
to be set forth in the dissenter's notice pursuant to section 490.1322,
subsection 2, paragraph "c", and deposit the shareholder's certificates in
accordance with the terms of the notice.

     2.   The shareholder who demands payment and deposits the shareholder's
shares under subsection 1 retains all other rights of a shareholder until these
rights are canceled or modified by the taking of the proposed corporate action.

     3.   A shareholder who does not demand payment or deposit the
shareholder's share certificates where required, each by the date set in the
dissenters' notice, is not entitled to payment for the shareholder's shares
under this division.

     490.1324  SHARE RESTRICTIONS. -- 1.   The corporation may restrict the
transfer of uncertificated shares from the date the demand for their payment is
received until the proposed corporate action is taken or the restrictions
released under section 490.1326.

     2.   The person for whom dissenters' rights are asserted as to
uncertificated shares retains all other rights of a shareholder until these
rights are canceled or modified by the taking of the proposed corporate action.

     490.1325  PAYMENT. -- 1.    Except as provided in section 490.1327, (1) at
the time the proposed corporate action is taken, or upon receipt of a payment
demand, whichever occurs later, the corporation shall pay each dissenter who
complied with section 490.1323
<PAGE>   229
3-16-98                  IOWA BUSINESS CORPORATION ACT             CORP.--271

the amount the corporation estimates to be the fair value of the dissenter's
shares, plus accrued interest.

     2.   The payment must be accompanied by all of the following:

     a.   The corporation's balance sheet as of the end of a fiscal year ending
not more than sixteen months before the date of payment, an income statement
for that year, a statement of changes in shareholders' equity for that year,
and the latest available interim financial statements, if any.

     b.   A statement of the corporation's estimate of the fair value of the
shares.

     c.   An explanation of how the interest was calculated.

     d.   A statement of the dissenter's right to demand payment under section
490.1328.

     e.   A copy of this division. (Last amended by Ch. 211, L. '91, eff.
7-1-91.)

- ----
     Ch. 211, L. '91, eff. 7-1-91, added matter in italic and deleted (1)"as
soon as".

     490.1326  FAILURE TO TAKE ACTION.--1.  If the corporation does not take
the proposed action with (1) one hundred eighty days after the date set for
demanding payment and depositing share certificates, the corporation shall
return the deposited certificates and release the transfer restrictions imposed
on uncertificated shares.

     2.  If after returning deposited certificates and releasing transfer
restrictions, the corporation takes the proposed action, it must send a new
dissenters' notice under section 490.1322 as if the corporate action was taken
without a vote of the shareholders and repeat the payment demand procedure.
(Last amended by Ch. 171, L. '97, eff. 7-1-97.)

- ----
     Ch. 171, L. '97, eff. 7-1-97, added matter in italic and deleted
(1)"sixty."

     490.1327  AFTER-ACQUIRED SHARES.--1.  A corporation may elect to withhold
payment required by section 490.1325 from a dissenter unless the dissenter was
the beneficial owner of the shares before the date set forth in the dissenters'
notice as the date of the first announcement to news media or to shareholders
of the terms of the proposed corporate action.

     2.  To the extent the corporation elects to withhold payment under
subsection 1, after taking the proposed corporate action, it shall estimate the
fair value of the shares, plus accrued interest, and shall pay this amount to
each dissenter who agrees to accept it in full satisfaction of the dissenter's
demand. The corporation shall send with its offer a statement of its estimate
of the fair value of the shares, an explanation of how the interest was
calculated, and a statement of the dissenter's right to demand payment under
section 490.1328.

     490.1328  PROCEDURE IF SHAREHOLDER DISSATISFIED WITH PAYMENT OR
OFFER.--1.  A dissenter may notify the corporation in writing of the
dissenter's own estimate of the fair value of the dissenter's shares and amount
of interest due, and demand payment of the dissenter's estimate, less any
payment under section 490.1325, or reject the corporation's offer under section
490.1327 and demand payment of the fair value of the dissenter's shares and
interest due, if any of the following apply:

     a.   The dissenter believes that the amount paid under section 490.1325 or
offered under section 490.1327 is less than the fair value of the dissenter's
shares or that the interest due is incorrectly calculated.

     b.   The corporation fails to make payment under section 490.1325 within
sixty days after the date set for demanding payment.

     c.   The corporation, having failed to take the proposed action, does not
return the deposited certificates or release the transfer restrictions imposed
on uncertificated shares within sixty days after the date set for demanding
payment.

     2.   A dissenter waives the dissenter's right to demand payment under this
section unless the dissenter notifies the corporation of the dissenter's demand
in writing under subsection 1 within thirty days after the corporation made or
offered payment for the dissenter's shares.

                                     PART C

     490.1330  COURT ACTION.--1.  If a demand for payment under section
490.1328 remains unsettled, the corporation shall commence a proceeding within
sixty days after receiving the payment demand and petition the court to
determine the fair value of the


<PAGE>   230
272-CORP.              IOWA BUSINESS CORPORATION ACT                     3-16-98

shares and accrued interest. If the corporation does not commence the
proceeding within the sixty-day period, it shall pay each dissenter whose
demand remains unsettled the amount demanded.

     2.  The corporation shall commence the proceeding in the district court of
the county where a corporation's principal office or, if none in this state,
its registered office is located. If the corporation is a foreign corporation
without a registered office in this state, it shall commence the proceeding in
the county in this state where the registered office of the domestic
corporation merged with or whose shares were acquired by the foreign
corporation was located.

     3.  The corporation shall make all dissenters, whether or not residents of
this state, whose demands remain unsettled parties to the proceeding as in an
action against their shares and all parties must be served with a copy of the
petition. Nonresidents may be served by registered or certified mail or by
publication as provided by law.

     4.  The jurisdiction of the court in which the proceeding is commenced
under subsection 2 is plenary and exclusive. The court may appoint one or more
persons as appraisers to receive evidence and recommend decision on the
question of fair value. The appraisers receive evidence and recommend decision
on the question of fair value. The appraisers have the powers described in the
order appointing them, or in any amendment to it. The dissenters are entitled
to the same discovery rights as parties in other civil proceedings.

     5.  Each dissenter made a party to the proceeding is entitled to judgment
for either of the following:

     a.  The amount, if any, by which the court finds the fair value of the
dissenter's shares, plus interest, exceeds the amount paid by the corporation.

     b.  The fair value, plus accrued interest, of the dissenter's
after-acquired shares for which the corporation elected to withhold payment
under section 490.1327.

     .1  SCOPE OF REVIEW ON APPEAL. - The Supreme Court of Iowa held that the
appellate review of an appraisal action is a review for errors at law, not de
novo. Appellants asserted that the scope of review under BCA Section 490.1330
should be de novo because its predecessor statute clearly dictated that the
scope of review was de novo, and the legislature did not expressly manifest its
intent to change the nature of the proceedings. The court rejected this
argument, holding that the review of an appraisal action is one at law. Sieg Co
v Kelly, 512 NW2d 275 (1994).

     .2  APPRAISAL: FAIR VALUE. - The Supreme Court of Iowa held while BCA
Sections 490-1330 - 490.1331, governing fair-value determinations of stock in
an appraisal action, does not expressly impose a duty to reevaluate the
determination, "we think such a duty is implicit in the statute." A
corporation's duty to offer fair value does not end once it has paid its
estimate of fair value. Sieg Co v Kelly, 568 NW2d 794 (1997).

     490.1331  COURT COSTS AND COUNSEL FEES. - 1.  The court in an appraisal
proceeding commenced under section 490.1330 shall determine all costs of the
proceeding, including the reasonable compensation and expenses of appraisers
appointed by the court. The court shall assess the costs against the
corporation, except that the court may assess costs against all or some of the
dissenters, in amounts the court finds equitable, to the extent the court finds
the dissenters acted arbitrarily, vexatiously, or not in good faith in
demanding payment under section 490.1328.

     2.  The court may also assess the fees and expenses of counsel and experts
for the respective parties, in amounts the court finds equitable, for either of
the following:

     a.  Against the corporation and in favor of any or all dissenters if the
court finds the corporation did not substantially comply with the requirements
of sections 490.1320 through 490.1328.

     b.  Against either the corporation or a dissenter, in favor of any other
party, if the court finds that the party against whom the fees and expenses are
assessed acted arbitrarily, vexatiously, or not in good faith with respect to
the rights provided by this chapter.

     3.  If the court finds that the services of counsel for any dissenter were
of substantial benefit to other dissenters similarly situated, and that the
fees for those services should not be assessed against the corporation, the
court may award to these counsel reasonable fees to be paid out of the amounts
awarded the dissenters who were benefited.

<PAGE>   231
                                                                        ANNEX VI

                                 SECTION 262 OF
                        DELAWARE GENERAL CORPORATION LAW

262  APPRAISAL RIGHTS. -- (a) Any stockholder of a corporation of this State who
holds shares of stock on the date of the making of a demand pursuant to
subsection (d) of this section with respect to such shares, who continuously
holds such shares through the effective date of the merger or consolidation, who
has otherwise complied with subsection (d) of this section and who has neither
voted in favor of the merger or consolidation nor consented thereto in writing
pursuant to Section 228 of this title shall be entitled to an appraisal by the
Court of Chancery of the fair value of the stockholder's shares of stock under
the circumstances described in subsections (b) and (c) of this section. As used
in this section, the word "stockholder" means a holder of record of stock in a
stock corporation and also a member of record of a nonstock corporation; the
words "stock" and "share" mean and include what is ordinarily meant by those
words and also membership or membership interest of a member of a nonstock
corporation; and the words "depository receipt" mean a receipt or other
instrument issued by a depository representing an interest in one or more
shares, or fractions thereof, solely of stock of a corporation, which stock is
deposited with the depository.

(b)  Appraisal rights shall be available for the shares of any class or series
of stock of a constituent corporation in a merger or consolidation to be
effected pursuant to Section 251 (other than a merger effected pursuant to
Section 251(g) of this title), Section 252, Section 254, Section 257, Section
258, Section 263 or Section 264 of this title:

          (1)  Provided, however, that no appraisal rights under this section
     shall be available for the shares of any class or series of stock, which
     stock, or depository receipts in respect thereof, at the record date fixed
     to determine the stockholders entitled to receive notice of and to vote at
     the meeting of stockholders to act upon the agreement or merger or
     consolidation, were either (i) listed on a national securities exchange or
     designated as a national market system security on an interdealer quotation
     system by the National Association of Securities Dealers, Inc. or (ii) held
     of record by more than 2,000 holders; and further provided that no
     appraisal rights shall be available for any shares of stock of the
     constituent corporation surviving a merger if the merger did not require
     for its approval the vote of the stockholders of the surviving corporation
     as provided in subsection (f) of Section 251 of this title.

          (2)  Notwithstanding paragraph (1) of this subsection, appraisal
     rights under this section shall be available for the shares of any class or
     series of stock of a constituent corporation if the holders thereof are
     required by the terms of an agreement of merger or consolidation pursuant
     to Sections 251, 252, 254, 257, 258, 263 and 264 of this title to accept
     for such stock anything except:

               a.  Shares of stock of the corporation surviving or resulting
          from such merger or consolidation, or depository receipts in respect
          thereof;

               b.  Shares of stock of any other corporation, or depository
          receipts in respect thereof, which shares of stock (or depository
          receipts in respect thereof) or depository receipts at the effective
          date of the merger or consolidation will be either listed on a
          national securities exchange or designated as a national market system
          security on an interdealer quotation system by the National
          Association of Securities Dealers, Inc. or held of record by more than
          2,000 holders;


                                      C-1

<PAGE>   232
               c.  Cash in lieu of fractional shares or fractional depository
          receipts described in the foregoing subparagraphs a. and b. of this
          paragraph; or

               d.  Any combination of the shares of stock, depository receipts
          and cash in lieu of fractional shares or fractional depository
          receipts described in the foregoing subparagraphs a., b. and c. of
          this paragraph.

          (3)  In the event all of the stock of a subsidiary Delaware
     corporation party to a merger effected under Section 253 of this title is
     not owned by the parent corporation immediately prior to the merger,
     appraisal rights shall be available for the shares of the subsidiary
     Delaware corporation.

(c)  Any corporation may provide in its certificate of incorporation that
appraisal rights under this section shall be available for the shares of any
class or series of its stock as a result of an amendment to its certificate of
incorporation, any merger or consolidation in which the corporation is a
constituent corporation or the sale of all or substantially all of the assets of
the corporation. If the certificate of incorporation contains such a provision,
the procedures of this section, including those set forth in subsections (d) and
(e) of this section, shall apply as nearly as is practicable.

(d)  Appraisal rights shall be perfected as follows:

          (1)  If a proposed merger or consolidation for which appraisal rights
     are provided under this section is to be submitted for approval at a
     meeting of stockholders, the corporation, not less than 20 days prior to
     the meeting, shall notify each of its stockholders who was such on the
     record date for such meeting with respect to shares for which appraisal
     rights are available pursuant to subsections (b) or (c) hereof that
     appraisal rights are available for any or all of the shares of the
     constituent corporations, and shall include in such notice a copy of this
     section. Each stockholder electing to demand the appraisal of (1)such
     stockholder's shares shall deliver to the corporation, before the taking of
     the vote on the merger or consolidation, a written demand for appraisal of
     (1)such stockholder's shares. Such demand will be sufficient if it
     reasonably informs the corporation of the identity of the stockholder and
     that the stockholder intends thereby to demand the appraisal of (1)such
     stockholder's shares. A proxy or vote against the merger or consolidation
     shall not constitute such a demand. A stockholder electing to take such
     action must do so by a separate written demand as herein provided. Within
     10 days after the effective date of such merger or consolidation, the
     surviving or resulting corporation shall notify each stockholder of each
     constituent corporation who has complied with this subsection and has not
     voted in favor of or consented to the merger or consolidation of the date
     that the merger or consolidation has become effective; or

          (2)  If the merger or consolidation was approved pursuant to Section
     228 or Section 253 of this title, each constituent corporation, either
     before the effective date of the merger or consolidation or within ten days
     thereafter, shall notify each of the holders of any class or series of
     stock of such constituent corporation who are entitled to appraisal rights
     of the approval of the merger or consolidation and that appraisal rights
     are available for any or all shares of such class or series of stock of
     such constituent corporation, and shall include in such notice a copy of
     this section; provided that, if the notice is given on or after the
     effective date of the merger or consolidation, such notice shall be given
     by the surviving or resulting corporation to all such holders of any class
     or series of stock of a constituent corporation that are entitled to
     appraisal rights. Such notice may, and, if given on or after the effective
     date of the merger or


                                      C-2


<PAGE>   233
     consolidation, shall, also notify such stockholders of the effective date
     of the merger or consolidation. Any stockholder entitled to appraisal
     rights may, within 20 days after the date of mailing of such notice, demand
     in writing from the surviving or resulting corporation the appraisal of
     such holder's shares. Such demand will be sufficient if it reasonably
     informs the corporation of the identity of the stockholder and that the
     stockholder intends thereby to demand the appraisal of such holder's
     shares. If such notice did not notify stockholders of the effective date of
     the merger or consolidation, either (i) each such constituent corporation
     shall send a second notice before the effective date of the merger or
     consolidation notifying each of the holders of any class or series of stock
     of such constituent corporation that are entitled to appraisal rights of
     the effective date of the merger or consolidation or (ii) the surviving or
     resulting corporation shall send such a second notice to all such holders
     on or within 10 days after such effective date; provided, however, that if
     such second notice is sent more than 20 days following the sending of the
     first notice, such second notice need only be sent to each stockholder who
     is entitled to appraisal rights and who has demanded appraisal of such
     holder's shares in accordance with this subsection. An affidavit of the
     secretary or assistant secretary or of the transfer agent of the
     corporation that is required to give either notice that such notice has
     been given shall, in the absence of fraud, be prima facie evidence of the
     facts stated therein. For purposes of determining the stockholders
     entitled to receive either notice, each constituent corporation may fix, in
     advance, a record date that shall be not more than 10 days prior to the
     date the notice is given, provided, that if the notice is given on or after
     the effective date of the merger or consolidation, the record date shall be
     such effective date. If no record date is fixed and the notice is given
     prior to the effective date, the record date shall be the close of business
     on the day next preceding the day on which the notice is given.

(e)  Within 120 days after the effective date of the merger or consolidation,
the surviving or resulting corporation or any stockholder who has complied with
subsections (a) and (d) hereof and who is otherwise entitled to appraisal
rights, may file a petition in the Court of Chancery demanding a determination
of the value of the stock of all such stockholders. Notwithstanding the
foregoing, at any time within 60 days after the effective date of the merger or
consolidation, any stockholder shall have the right to withdraw (1) such
stockholder's demand for appraisal and to accept the terms offered upon the
merger or consolidation. Within 120 days after the effective date of the merger
or consolidation, any stockholder who has complied with the requirements of
subsections (a) and (d) hereof, upon written request, shall be entitled to
receive from the corporation surviving the merger or resulting from the
consolidation a statement setting forth the aggregate number of shares not voted
in favor of the merger or consolidation and with respect to which demands for
appraisal have been received and the aggregate number of holders of such shares.
Such written statement shall be mailed to the stockholder within 10 days after
(1) such stockholder's written request for such a statement is received by the
surviving or resulting corporation or within 10 days after expiration of the
period for delivery of demands for appraisal under subsection (d) hereof,
whichever is later.

(f)  Upon the filing of any such petition by a stockholder, service of a copy
thereof shall be made upon the surviving or resulting corporation, which shall
within 20 days after such service file in the office of the Register in Chancery
in which the petition was filed a duly verified list containing the names and
addresses of all stockholders who have demanded payment for their shares and
with whom agreements as to the value of their shares have not been reached by
the surviving or resulting corporation. If the petition shall be filed by the
surviving or resulting corporation, the petition shall be accompanied by such a
duly


                                      C-3


<PAGE>   234
verified list. The Register in Chancery, if so ordered by the Court, shall
give notice of the time and place fixed for the hearing of such petition by
registered or certified mail to the surviving or resulting corporation and to
the stockholders shown on the list at the addresses therein stated. Such notice
shall also be given by 1 or more publications at least 1 week before the day of
the hearing, in a newspaper of general circulation published in the City of
Wilmington, Delaware or such publication as the Court deems advisable. The forms
of the notices by mail and by publication shall be approved by the Court, and
the costs thereof shall be borne by the surviving or resulting corporation.

(g)  At the hearing on such petition, the Court shall determine the
stockholders who have complied with this section and who have become entitled to
appraisal rights. The Court may require the stockholders who have demanded an
appraisal for their shares and who hold stock represented by certificates to
submit their certificates of stock to the Register in Chancery for notation
thereon of the pendency of the appraisal proceedings; and if any stockholder
fails to comply with such direction, the Court may dismiss the proceedings as
to such stockholder.

(h)  After determining the stockholders entitled to an appraisal, the Court
shall appraise the shares, determining their fair value exclusive of any
element of value arising from the accomplishment or expectation of the merger
or consolidation, together with a fair rate of interest, if any, to be paid
upon the amount determined to be the fair value. In determining such fair
value, the Court shall take into account all relevant factors. In determining
the fair rate of interest, the Court may consider all relevant factors,
including the rate of interest which the surviving or resulting corporation
would have had to pay to borrow money during the pendency of the proceeding.
Upon application by the surviving or resulting corporation or by any
stockholder entitled to participate in the appraisal proceeding, the Court may,
in its discretion, permit discovery or other pretrial proceedings and may
proceed to trial upon the appraisal prior to the final determination of the
stockholder entitled to an appraisal. Any stockholder whose name appears on the
list filed by the surviving or resulting corporation pursuant to subsection (f)
of this section and who has submitted (1) such stockholder's certificates of
stock to the Register in Chancery, if such is required, may participate fully
in all proceedings until it is finally determined that (2) such stockholder is
not entitled to appraisal rights under this section.

(i)  The Court shall direct the payment of the fair value of the shares,
together with interest, is any, by the surviving or resulting corporation to
the stockholders entitled thereto. Interest may be simple or compound, as the
Court may direct. Payment shall be so made to each such stockholder, in the
case of holders of uncertificated stock forthwith, and the case of holders of
shares represented by certificates upon the surrender to the corporation of the
certificates representing such stock. The Court's decree may be enforced as
other decrees in the Court of Chancery may be enforced, whether such surviving
or resulting corporation be a corporation of this State or of any state.

(j)  The costs of the proceeding may be determined by the Court and taxed upon
the parties as the Court deems equitable in the circumstances. Upon application
of a stockholder, the Court may order all or a portion of the expenses incurred
by any stockholder in connection with the appraisal proceeding, including,
without limitation, reasonable attorney's fees and the fees and expenses of
experts, to be charged pro rata against the value of all the shares entitled to
an appraisal.

(k)  From and after the effective date of the merger or consolidation, no
stockholder who has demanded (1) appraisal rights as provided in subsection (d)
of this section shall be entitled to vote such stock for any purpose or to
receive payment of dividends or other


                                      C-4
<PAGE>   235
distributions on the stock (except dividends or other distributions payable to
stockholders of record at a date which is prior to the effective date of the
merger or consolidation); provided, however, that if no petition for an
appraisal shall be filed within the time provided in subsection (e) of this
section, or if such stockholder shall deliver to the surviving or resulting
corporation a written withdrawal of (1)such stockholder's demand for an
appraisal and an acceptance of the merger or consolidation, either within 60
days after the effective date of the merger or consolidation as provided in
subsection (e) of this section or thereafter with the written approval of the
corporation, then the right of such stockholder to an appraisal shall cease.
Notwithstanding the foregoing, no appraisal proceeding in the Court of Chancery
shall be dismissed as to any stockholder without the approval of the Court, and
such approval may be conditioned upon such terms as the Court deems just.

(1) The shares of the surviving or resulting corporation to which the shares of
such objecting stockholders would have been converted had they assented to the
merger or consolidation shall have the status of authorized and unissued shares
of the surviving or resulting corporation. (Last amended by Ch. 339, L. '98,
eff. 7-1-98.)





- -------------
Ch. 339, L. '98, eff. 7-2-98, added matter in italic and deleted (1)"his" and
(2)"he".

<PAGE>   236
                                    Part II
                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 20. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

         Sections 490.852 and 490.856 of the Iowa Business Corporation Act, as
amended (the "IBCA") sets forth the conditions and limitations governing the
indemnification of officers, directors, and other persons.

         Reference is made to Article XIII of Mahaska's Bylaws which provides
for indemnification of directors, officers, employees or agents of Mahaska's to
the full extent permitted by the above-mentioned section of the Act.

         Section 490.857 of the IBCA and Article XIII, Section (b) of the Bylaws
also authorize Mahaska to purchase and maintain insurance on behalf of any
director, officer, employee or agent of Mahaska against any liability asserted
against or incurred by them in such capacity or arising out of their status as
such whether or not Mahaska would have the power to indemnify such director,
officer, employee or agent against such liability under the applicable
provisions of the Act or Bylaws. Mahaska currently maintains a directors and
officers liability policy in the amount of $5 million.

ITEM 21. EXHIBITS.

         Exhibits

<TABLE>
<CAPTION>
Exhibit
Number
- ------
<S>      <C>
2.1      Agreement and Plan of Merger dated February 2, 1999 (attached as Annex
         I to the joint proxy statement/prospectus included in this Registration
         Statement.

3.1      Articles of Incorporation of Mahaska Investment Company (incorporated
         by reference to Exhibit 3.1 to the Registrant's Form 10Q for the
         quarter ended September 30, 1998 (Exchange Act File No. 0-24630)).

3.2      Bylaws of Mahaska Investment Company (incorporated by reference to
         Exhibit 3.2 to the Registrant's Form 10Q for the quarter ended
         September 30, 1998 (Exchange Act File No. 0-24630)).

5.1      Opinion of Chapman and Cutler as to legality of securities.

8.1      Opinion of KPMG LLP as to tax matters relating to the merger.
</TABLE>



                                      II-1
<PAGE>   237
<TABLE>
<CAPTION>
Exhibit
Number
- ------
<S>      <C>
10.1     Form of Employee Agreement between the Registrant and William D.
         Hassel.

10.2     Form of Employee Agreement between the Registrant and Robert D.
         Maschmann.

23.1     Consent of KPMG LLP.

23.2     Consent of KPMG LLP.

23.3     Consent of Chapman and Cutler (included in Exhibit 5.1).

23.4     Consent of Howe Barnes Investments, Inc.

23.5     Consent of Charles Webb & Company.

23.6     Consent of William D. Hassel, Director-nominee.

24.1     Power of Attorney (included on signature page at page II-5).

99.1     Mahaska Form of Proxy.

99.2     Midwest Form of Proxy.
</TABLE>


ITEM 22. UNDERTAKINGS.

         (a) The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act, each filing of the
Registrant's annual report pursuant to section 13(a) or section 15(d) of the
Securities Exchange Act of 1934 (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to section 15(d) of the Exchange
Act) that is incorporated by reference in the registration statement shall be
deemed to be a new registration statement relating to the securities offered
therein, and the offering of such securities so that time shall be deemed to be
the initial bona fide offering thereof.

         (b) Insofar as indemnification for liabilities arising under the
Securities Act may be permitted to directors, officers and controlling persons
of the Registrant pursuant to the provisions described under "Item 20 --
Indemnification of Directors and Officers" above, or otherwise, the Registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Securities Act
and is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Registrant of expenses
incurred or paid by a director, officer or controlling person of the Registrant
in the successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such




                                      II-2
<PAGE>   238
indemnification by it is against public policy as expressed in the Securities
Act and will be governed by the final adjudication of such issue.

         (c) The undersigned Registrant hereby undertakes to respond to requests
for information that is incorporated by reference into the Prospectus pursuant
to Item 4, 10(b), 11, or 13 of this form within one business day of receipt of
such request, and to send the incorporated documents by first class mail or
other equally prompt means. This includes information contained in documents
filed after the effective date of this Registration Statement through the date
of responding to the request.

         (d) The undersigned Registrant hereby undertake to supply by means of a
post-effective amendment all information concerning a transaction, and the
company being acquired involved therein, that was not the subject of and
included in this Registration Statement when it became effective.






                                      II-3
<PAGE>   239
                                   SIGNATURES
         Pursuant to the requirements of the Securities Act of 1933, the
Registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S4 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized in the City of Oskaloosa, County of Mahaska, Iowa, on May 24, 1999.

                                       MAHASKA INVESTMENT COMPANY



                                       By   /s/ David A. Meinert
                                            ----------------------------------
                                            David A. Meinert
                                            Chief Financial Officer






                                      II-4
<PAGE>   240
                                POWER OF ATTORNEY

         KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints jointly and severally, Charles S. Howard,
David A. Meinert and Karen K. Baack, and each of them, as his true and lawful
attorneyinfact and agents, with full power of substitution and resubstitution,
for him and in his name, place and stead, in any and all capacities, to sign any
and all amendments (including post-effective amendments) to this Registration
Statement and to sign any registration statement and amendments thereto for the
same offering filed pursuant to Rule 462(b), and to file the same, with all
exhibits thereto, and other documents in connection therewith, with the
Securities and Exchange commission, granting unto said attorneys-in-fact and
agents, and each of them, full power and authority to do and perform each and
every act and thing requisite and necessary to be done in connection therewith,
as fully to all intents and purposes as he might or could do in person, hereby
ratifying, and conforming all that said attorneys-in-fact and agents, or any of
them, or their or his substitute or substitutes, may lawfully do or cause to be
done by virtue hereof.

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

<TABLE>
<CAPTION>
       SIGNATURES                           TITLE                                 DATE
       ----------                           -----                                 ----

<S>                                 <C>                                        <C>
/s/  CHARLES S. HOWARD              Chairman, President and                     May 24, 1999
     ----------                                                                 ------
     Charles S. Howard              Chief Executive Officer


/s/  DAVID A. MEINERT               Director, Executive Vice                    May 24, 1999
     ----------------                                                           ------
     David A. Meinert               President and Chief Financial
                                      Officer (Principal financial and
                                      accounting officer)


/s/  R. SPENCER HOWARD              Director and Vice President                 May 24, 1999
     -----------------                                                          ------
     R. Spencer Howard              of Corporate Planning


/s/  MARTIN L. BERNSTEIN            Director                                    May 24, 1999
     -------------------                                                        ------
     Martin L. Bernstein


/s/  JAMES F. MATHEW                Director                                    May 24, 1999
     ---------------                                                            ------
     James F. Mathew


/s/  JOHN P. POTHOVEN               Director                                    May 24, 1999
     ----------------                                                           ------
     John P. Pothoven


/s/  JOHN W.N. STEDDOM              Director                                    May 24, 1999
     -----------------                                                          ------
     John W.N. Steddom
</TABLE>



                                      II-5
<PAGE>   241
                                  EXHIBIT INDEX
<TABLE>
<CAPTION>

<S>      <C>
2.1      Agreement and Plan of Merger dated February 2, 1999 (attached as Annex
         I to the joint proxy statement and prospectus included in this
         Registration Statement).

3.1      Articles of Incorporation of Mahaska Investment Company (incorporated
         by reference to the Registrant's Form 10Q for the quarter ended
         September 30, 1998 (Exchange Act File No. 0-24630)).

3.2      Bylaws of Mahaska Investment Company (incorporated by reference to the
         Registrant's Form 10Q for the quarter ended September 30, 1998
         (Exchange Act File No. 0-24630)).

5.1      Opinion of Chapman and Cutler as to legality of securities.

8.1      Opinion of KPMG LLP as to tax matters relating to the merger.

10.1     Form of Employment Agreement between the Registrant and William D.
         Hassel.

10.2     Form of Employment Agreement between the Registrant and Robert D.
         Maschmann.

23.1     Consent of KPMG LLP.

23.2     Consent of KPMG LLP.

23.3     Consent of Chapman and Cutler (included in Exhibit 5.1).

23.4     Consent of Howe Barnes Investments, Inc.

23.5     Consent of Charles Webb & Company.

23.6     Consent of William D. Hassel, Director-nominee.

24.1     Power of Attorney (included on signature page as Page II-5).

99.1     Mahaska Form of Proxy.

99.2     Midwest Form of Proxy.
</TABLE>


                                      II-6

<PAGE>   1
                                                                    EXHIBIT 5.1


                                  May 26, 1999


Mahaska Investment Company
222 First Avenue East
Oskaloosa, Iowa  52577


      Re:                 Mahaska Investment Company
                       Form S-4 Registration Statement
                --------------------------------------------------

Gentlemen:

      We have acted as counsel for Mahaska Investment Company (the
"Company"), in connection with the proposed issuance of certain shares of the
Company's common stock, par value $5.00 per share (the "Shares"), in connection
with the merger of Midwest Bancshares, Inc., a Delaware corporation, with the
Company.  As such counsel, we have examined such corporate records and other
documents and matters of law as we have deemed necessary in order to enable us
to express the opinion hereinafter set forth, including, without limitation,
the Company's registration statement on Form S-4 (the "Registration Statement")
which is being filed with the Securities and Exchange Commission pursuant to
the Securities Act of 1933 on the date hereof.

      Based on the foregoing, we are of the opinion that, upon issuance of
the Shares for the consideration stated in the Prospectus constituting a part
of the above-mentioned Registration Statement and as otherwise contemplated
by such Registration Statement and the Merger Agreement referred to therein,
the Shares will be legally issued, fully paid and non-assessable.

      We hereby consent to the filing of this opinion as an exhibit to the
above-mentioned Registration Statement and to the use of our name and the
reference to our firm in said Registration Statement and in the Prospectus
included as a part thereof.


                                       Respectfully submitted,

                                       CHAPMAN AND CUTLER



<PAGE>   1
                                                                     EXHIBIT 8.1
May 24, 1999


<TABLE>
<S>                                      <C>
PRIVATE & CONFIDENTIAL
The Board of Directors                    The Board of Directors
Mahaska Investment Company                Midwest Bancshares, Inc.
Post Office Box 1104                      3225 Division Street
222 First Avenue E.                       Burlington, IA  52601
Oskaloosa, IA  52577-1104
</TABLE>

Board Members:

You have requested the opinion of KPMG LLP ("KPMG") regarding certain federal
and state income tax consequences resulting from the proposed merger of Midwest
Bancshares, Inc. (the "Company") with and into Mahaska Investment Company
("Mahaska") in exchange for common stock of Mahaska. Specifically, you have
requested us to opine that the form and substance of the merger of the Company
with and into Mahaska will constitute a reorganization under section
368(a)(1)(A) of the Internal Revenue Code of 1986, as amended (the "Code")
(hereinafter, all section references are to the Code unless otherwise
indicated).

FACTS AND REPRESENTATIONS

Mahaska is an Iowa corporation and a registered bank holding company under the
Bank Holding Company Act of 1956, as amended with its principal office in
Oskaloosa, Iowa.  At February 2, 1999, Mahaska had outstanding 3,636,345 shares
of Common Stock, par value $5.00 per share, and 171,156 shares of such Common
Stock are held in Mahaska's treasury.  Mahaska has no other stock outstanding.

The Company is a Delaware corporation and a unitary savings and loan holding
company registered under the Home Owner's Loan Act and is subject to oversight
by the Office of Thrift Supervision (the "OTS").  At February 2, 1999 the
Company had outstanding 1,098,523 shares of Common Stock, par value $0.01 per
share, 0 shares of such Common Stock held in the Company's treasury, and 20,950
options to purchase shares of Company Common Stock.  The Company has no other
stock outstanding.  Hereinafter, holders of any Company stock shall be referred
to as "Company Shareholders."


<PAGE>   2
The Board of Directors
Mahaska Investment Company
May 24, 1999
Page 2

It has been represented to KPMG that, for valid corporate business purposes,
the Boards of Directors of Company and Mahaska have adopted an Agreement and
Plan of Merger (the "Merger") to combine their businesses.  In order to reach
that result, the following transaction is proposed:

1. The Company will merge with and into the Mahaska in accordance with the
   Merger entered into between the parties and in accordance with applicable
   federal and state law.  All assets and liabilities of the Company will
   become assets and liabilities of Mahaska.  The Merger is intended to qualify
   as a reorganization under section 368(a)(1)(A) of the Code.  As a result of
   the Merger, the separate corporate existence of the Company will cease and
   Mahaska will be the surviving entity.

2. On the Effective Date and pursuant to the Merger, the Company Shareholders
   will, in exchange for the surrender and cancellation of their respective
   stock interests in the Company, other than shares to which dissenters'
   rights have been asserted and duly perfected in accordance with Delaware
   law, receive solely one share of Mahaska common stock for each share of
   Company Common Stock.

3. On the effective Date and pursuant to the Merger, any options to acquire
   shares of Company Common Stock or securities convertible into, or
   exchangeable for Company Common Stock, whether or not then exercisable shall
   be converted into the right to acquire shares of Mahaska under the Mahaska
   Investment Company 1996 Stock Incentive Plan (the "Mahaska Plan"), provided,
   however, to the extent that the plan and agreements pursuant to which such
   options were granted are more favorable than the "Mahaska Plan", then the
   more favorable provisions of those will remain in effect.

4. Mahaska Stock described in (2) above shall comprise the sole Merger
   consideration to be received by the Company Shareholders in exchange for
   their Company Stock.

The following additional representations have been made by you to KPMG in
regard to the Merger:

a) The conversion rate at which the shares of the Company will be exchanged for
   Mahaska Common Stock was determined pursuant to arm's-length negotiations
   between the parties to the Merger, and it is the belief of the Board of
   Directors of Mahaska and the Company that such conversion rate reflects the
   fact that the fair market value of Mahaska Common Stock received by each the
   Company shareholder will be equal to the fair market value of the stock of
   the Company surrendered in the exchange.  The exchange ratio is one share of
   Mahaska Common Stock for one share of Company Common Stock.


<PAGE>   3
The Board of Directors
Mahaska Investment Company
May 24, 1999
Page 3

b) To the best of the knowledge of the Company's management, there is no plan
   or intention by the shareholders of the Company who own 1 percent or more of
   the Company stock, and there is no plan or intention on the part of the
   remaining shareholders of the Company to sell, exchange, or otherwise
   dispose of a number of shares of Mahaska Common Stock received in the Merger
   that would reduce the Company Shareholders' ownership of Mahaska Common
   Stock to a number of shares having a value, as of the date of the Merger, of
   less than 50 percent of the value of all of the formerly outstanding stock
   of the Company as of the same date.  Moreover, shares of the Company Common
   Stock and of Mahaska Common Stock held by the Company Shareholders and
   otherwise sold, redeemed, or disposed of prior or subsequent to the Merger
   will be considered in making this representation.

c) Mahaska has no plan or intention to reacquire any of its stock issued in the
   Merger except in the normal course of its business.

d) Mahaska has no plan or intention to sell or otherwise dispose of any of the
   assets of the Company acquired in the Merger, except for dispositions made
   in the ordinary course of business.

e) The liabilities of the Company assumed by Mahaska and the liabilities, if
   any, to which the transferred assets of the Company are subject were
   incurred by the Company in the ordinary course of business.

f) Following the Merger, Mahaska will continue the historic business of the
   Company or use a significant portion of the Company's historic business
   assets in a business.

g) Mahaska, the Company and Company Shareholders will pay their respective
   expenses, if any, incurred in connection with the Merger.

h) There is no intercorporate indebtedness existing between Mahaska and the
   Company that was issued, acquired, or will be settled at a discount.

i) No two parties to the Merger are investment companies as defined in section
   368(a)(2)(F)(iii) and (iv) of the Code.

j) The Company is not under the jurisdiction of a court in a Title 11 or
   similar case within the meaning of section 368(a)(3)(A) of the Code.


<PAGE>   4
The Board of Directors
Mahaska Investment Company
May 24, 1999
Page 4

k) The fair market value of the assets of the Company transferred to Mahaska
   will equal or exceed the sum of the liabilities assumed by Mahaska plus the
   amount of liabilities, if any, to which the transferred assets are subject.

l) None of the compensation received by any shareholders of the Company who are
   employees of the Company or Mahaska ("Shareholder-Employees") will be
   separate consideration for, or allocable to, any of their shares of the
   Company stock; none of the shares of Mahaska Common Stock received by
   Shareholder-Employees will be separate consideration for, or allocable to,
   any employment agreement; and the compensation paid to any
   Shareholder-Employees will be for services actually rendered and will be
   commensurate with amounts paid to third parties bargaining at arm's-length
   for similar services.

m) There have been no material changes in the ownership of the Company Stock
   within the past two years, other than in the normal course of its business.

n) Immediately following the Merger, the former shareholders of the Company
   will own, in the aggregate, less than 50 percent of the voting power and
   value of the stock of Mahaska.

OPINION

Based solely on the FACTS AND REPRESENTATIONS, and the Merger, and as limited
by the SCOPE OF THE OPINION, it is the opinion of KPMG that under current
federal income tax law:

1) Provided that the Merger of the Company with and into Mahaska qualifies as a
   statutory merger under applicable state and federal law, the Merger will
   constitute a reorganization within the meaning of section 368(a)(1)(A) of
   the Code.

2) With respect to the Merger, the Company and Mahaska will each be "a party to
   a reorganization" within the meaning of section 368(b) of the Code.

3) The Company will recognize no gain or loss upon the transfer of its assets
   to Mahaska pursuant to the Merger in exchange solely for Mahaska Common
   Stock and the assumption by Mahaska of the liabilities of the Company.
   Sections 357(a) and 361.

4) No gain or loss will be recognized by Mahaska upon the receipt of the assets
   of the Company, subject to the liabilities of the Company, pursuant to the
   Merger.  Section 1032(a).


<PAGE>   5
The Board of Directors
Mahaska Investment Company
May 24, 1999
Page 5

5) The basis of the assets of the Company in the hands of Mahaska will be the
   same as the basis of such assets in the hands of the Company immediately
   prior to the Merger.  Section 362(b).

6) The holding period of the assets of the Company in the hands of Mahaska will
   include the holding period of such assets in the hands of the Company
   immediately prior to the Merger.  Section 1223(2).

7) No gain or loss will be recognized by the Company Shareholders on the
   exchange of their Company stock pursuant to the Merger solely for Mahaska
   Common Stock.  Section 354(a)(1).

8) The basis of Mahaska Common Stock to be received by the Company Shareholders
   will be, in each instance, the same as the basis of the Company Common Stock
   surrendered in exchange therefore as of the Effective Date.  Section
   358(a)(1).

9) The holding period of the Mahaska Common Stock received pursuant to the
   Merger by the Company Shareholders in exchange for the Company Common Stock
   will include the holding period of the Company Common Stock for which it is
   exchanged, provided that the shares of the Company Common Stock are capital
   assets in the hands of the holder thereof at the Effective Date.  Section
   1223(1).

10)The tax attributes of the Company enumerated in section 381(c), including
   any earnings and profits or a deficit in earnings and profits, will be taken
   into account by Mahaska following the Merger.  These tax attributes will be
   subject to the limitations as provided in sections 381, 382, 383, and 384
   and the regulations thereunder.

Under the Code of Iowa, both corporations and financial institutions compute
their net income using federal taxable income as a starting point.  Federal
taxable income is properly computed for federal income tax purposes pursuant
to the Code, which is specifically cited in the Code of Iowa.  Several
specific adjustments are enumerated in Section 422.61 of the Code of Iowa to
determine net income for Iowa franchise tax purposes.

The Iowa statute places strict reliance on the Code and, based solely on the
FACTS AND REPRESENTATIONS, and the Agreement and Plan of Merger, and as
limited by the SCOPE OF THE OPINION, it is the opinion of KPMG that under
current Iowa income tax law, all the  provisions of the federal tax opinion
shall also apply on a similar basis.


<PAGE>   6
The Board of Directors
Mahaska Investment Company
May 24, 1999
Page 6

SCOPE OF THE OPINION

The opinions expressed above are rendered only with respect to the specific
matters discussed herein, and we express no opinion with respect to any other
federal or state income tax or legal aspect of the offering.  If any of the
above-stated facts, circumstances, or assumptions are not entirely complete
or accurate, it is imperative that we be informed immediately, as the
inaccuracy or incompleteness could have a material effect on our
conclusions.  In rendering our opinion, we are relying upon the relevant
provisions of the Internal Revenue Code of 1986, as amended, the regulations
thereunder, and judicial and administrative interpretations thereof, which
are subject to change or modification by subsequent legislative, regulatory,
administrative, or judicial decisions.  Any such changes could also have an
effect on the validity of our opinion. The opinions contained herein are not
binding upon the Internal Revenue Service, any other tax authority or any
court, and no assurance can be given that a position contrary to that
expressed herein will not be asserted by a tax authority and ultimately
sustained by a court.


KPMG LLP


<PAGE>   1
                                                                    EXHIBIT 10.1


                              EMPLOYMENT AGREEMENT

         THIS EMPLOYMENT AGREEMENT ("Agreement") is made and entered into as of
this day of _____________ , 199__, by and between MIDWEST FEDERAL SAVINGS AND
LOAN ASSOCIATION OF EASTERN IOWA, a federally chartered savings and loan
association whose address is 3225 Division Street, Burlington, Iowa 52601,
(which, together with any successor thereto which executes and delivers the
assumption agreement provided for in Section 11(a) hereof or which otherwise
becomes bound by the terms and provisions of this Agreement by operation of law,
is hereinafter referred to as the "Association"), and WILLIAM D. HASSEL whose
residence address is 2526 Quail Ridge Drive, Burlington, Iowa (the "Employee").

         WHEREAS, the Employee has served as President and Chief Executive
Officer of the Association and Midwest Bancshares, Inc.; and

         WHEREAS, the Association is being merged with and into Mahaska
Investment Company ("Mahaska"); and

         WHEREAS, Employee is willing to release any rights which he may have
pursuant to his Employment Agreement dated November 10, 1992, upon Closing of
the merger in consideration for the execution of this Agreement and payment of
the cash which Employee is entitled to receive at Closing; and

         WHEREAS, the Board of Directors of the Association recognizes that the
possibility of a change in control of Mahaska or the Association may exist and
that such possibility, and the uncertainty and questions which it may raise
among management, may result in the departure or distraction of key management
personnel to the detriment of the Association, Mahaska and its stockholders; and

         WHEREAS, the Board of Directors of the Association desires to provide
certain benefits to the Employee following his involuntary termination of
employment after a change of control of the Association or Mahaska; and

         WHEREAS, the Board of Directors of the Association believes it is in
the best interests of the Association to enter into this Agreement with the
Employee in order to assure continuity of management of the Association and to
reinforce and encourage the continued attention and dedication of the Employee
to his assigned duties without distraction in the face of potentially disruptive
circumstances arising from the possibility of a change in control of Mahaska or
the Association, although no such change is now contemplated; and

         WHEREAS, the Board of Directors of the Association has approved and
authorized the execution of this Agreement with the Employee to take effect as
stated in Section 4 hereof;




                                    EXHIBIT D
                              (to Merger Agreement)
<PAGE>   2
         NOW, THEREFORE, in consideration of the foregoing and of the respective
covenants and agreements of the parties herein contained, it is AGREED as
follows:

          1. Employment. The Employee will be employed as President and Chief
Executive Officer of the Association, or in such other more senior capacity as
the Board of Directors may subsequently determine. As President and Chief
Executive Officer, Employee shall render administrative and management services
as are customarily performed by persons situated in similar executive
capacities, and shall have other powers and duties as may from time to time be
prescribed by the Board, provided that such duties are consistent with the
Employee's position. The Employee shall continue to devote his best efforts and
substantially all his business time and attention to the business and affairs of
the Association and its subsidiaries and affiliated companies.

          2. Compensation. (a) Salary. The Association agrees to pay the
Employee during the term of this Agreement a salary established by the Board of
Directors. The salary hereunder as of the Commencement Date (as defined in
Section 4 hereof) shall be $121,500. The salary provided for herein shall be
payable in cash not less frequently than bi-monthly in accordance with the
practices of the Association; provided, however, that no such salary is required
to be paid by the terms of this Agreement in respect of any month or portion
thereof subsequent to the termination of this Agreement, and provided further,
that the amount of such salary shall be reviewed by the Association not less
often than annually and may be increased (but not decreased) from time to time
in such amounts as the Board of Directors in its discretion may decide, subject
to the customary withholding tax and other employee taxes as required with
respect to compensation paid by a corporation to an employee.

                   (b) Discretionary Bonuses. The Employee shall be entitled to
         participate in an equitable manner with all other executive officers of
         the Association in discretionary bonuses as authorized and declared by
         the Board of Directors of the Association to its executive employees.
         No other compensation provided for in this Agreement shall be deemed a
         substitute for the Employee's right to participate in such bonuses when
         and as declared by the Board of Directors. Association agrees to
         maintain a comparable bonus program to the program maintained by
         Mahaska for its executive employees and the executive employees of its
         subsidiaries.

                   (c) Expenses. During the term of his employment hereunder,
         the Employee shall be entitled to receive prompt reimbursement for all
         reasonable expenses incurred by him (in accordance with policies and
         procedures at least as favorable to the Employee as those presently
         applicable to the senior executive officers of the Association) in
         performing services hereunder, provided that the Employee properly
         accounts therefor in accordance with Association policy.

          3. Benefits. (a) Participation in Retirement and Employee Benefit
Plans. The Employee shall be entitled while employed hereunder to participate
equitably in, and receive benefits under, all plans relating to stock options,
stock purchases, pension, thrift, profit-sharing, group life insurance, medical
coverage, education, cash or stock bonuses, and other retirement or





                                     D-1-2
<PAGE>   3
employee benefits or combinations thereof, that are now or hereafter maintained
for the benefit of the Association's executive employees or for its employees
generally.

                   (b) Fringe Benefits. The Employee shall be eligible while
         employed hereunder to participate in, and receive benefits under, any
         other fringe benefits which are or may become applicable to the
         Association's executive employees or to its employees generally,
         including a reasonable expense account and continued payment by the
         Association of Employee's dues for membership in the Burlington Golf
         Club. In addition, the Association shall provide Employee with an
         automobile and shall pay all expenses relative to the use or
         maintenance of said automobile by Employee. A new executive automobile
         (a Ford Explorer XLT or a comparable automobile) will be purchased by
         the Association for Employee's use not less frequently than every three
         (3) years. When a new automobile is purchased by the Association for
         Employee's use, Employee will have the right to purchase the automobile
         formerly used by Employee for a cash price equal to the greatest of the
         following: (1) the depreciated book value of such automobile on the
         books and records of the Association as of the last day of the calendar
         month next preceding the date of purchase; (2) the lowest published
         wholesale trade-in value for such automobile as of the calendar month
         next preceding the date of purchase; or (3) such cash price as shall be
         determined with reference to a method of determination consistent with
         the regulations, policies and directives of the Office of Thrift
         Supervision ("OTS"), as applicable at the time of such purchase. The
         Association reserves the right to consult with the appropriate OTS
         officials prior to the consummation of Employee's purchase of any
         formerly-used automobile to determine compliance with any such OTS
         regulation, policy or directive. Employee will have the option to
         purchase such automobile for a period of thirty (30) days after the
         date on which a new automobile is provided by Association for
         Employee's use. Such option shall also apply during the thirty (30) day
         period next following Employee's termination of service with the
         Association.

                   (c) Retirement, Employee Benefit Plans and Fringe Benefits.
         Association agrees to maintain retirement, employee benefit plans and
         fringe benefit programs comparable to the programs maintained by
         Mahaska for its executive employees and the executive employees of its
         subsidiaries.

          4. Term. The term of employment under this Agreement shall be a period
of 36 months commencing on the closing date of the merger (the "Commencement
Date"), subject to earlier termination as provided herein. Beginning on the
first anniversary of the Commencement Date, and on each anniversary thereafter,
the term of employment under this Agreement shall be extended, subject to the
next sentence of this paragraph, for a period of one year unless either the
Association or the Employee gives contrary written notice to the other not less
than 90 days in advance of the date on which the term of employment under this
Agreement would otherwise be extended. This Agreement will not be automatically
extended unless such extension is approved by the Board of Directors of the
Association following the Board's review of a formal performance evaluation of
the Employee performed by the disinterested members of the Board of Directors of
the Association and reflected in the minutes of the Board of Directors.
Reference herein to the term of employment under this Agreement shall refer to
both such initial term and such extended terms. As of the Commencement Date,
that certain Employment Agreement


                                     D-1-3
<PAGE>   4
entered into between the Association and Employee dated November 10, 1992, shall
terminate and have no further force or effect.

          5. Vacations. The Employee shall be entitled, without loss of pay, to
absent himself voluntarily from the performance of his employment under this
Agreement, all such voluntary absences to count as vacation time, provided that:

                  (a) During the term of employment under this Agreement, the
         Employee shall be entitled to an annual paid vacation of four weeks,
         or, if more favorable to Employee, in accordance with the most
         favorable plans, policies, programs or practices of the Association and
         its affiliated companies as in effect for the Association at any time
         during the six month period immediately preceding the Commencement
         Date, or as in effect generally at any time thereafter with respect to
         other senior executives of the association and its affiliated
         companies;

                  (b) The timing of vacations shall be scheduled in a reasonable
         manner by the Employee;

                  (c) The Board of Directors shall, solely at the Employee's
         request, be entitled to grant to the Employee a leave or leaves of
         absence with or without pay at such time or times and upon such terms
         and conditions as the Board of Directors, in its discretion, may
         determine; and

                  (d) Association agrees to maintain a vacation program
         comparable to the program maintained by Mahaska for its executive
         employees and the executive employees of its subsidiaries.

          6. Termination of Employment; Death. (a) The Board of Directors may
terminate the Employee's employment at any time, but any termination by the
Association's Board of Directors, other than termination for cause, shall not
prejudice the Employee's right to compensation or other benefits under the
Agreement. If the employment of the Employee is involuntarily terminated, other
than (i) for "cause" as provided in this Section 6(a) or (ii) by reason of death
or disability as provided in Sections 6(c) or 7, or if there occurs a voluntary
or involuntary termination of the Employee's employment as defined in Section 8
in connection with or within 12 months after a change in control which occurs at
any time during the term of this Agreement as provided in Section 8, the
Employee shall be entitled to receive, (i) his then applicable salary for the
remaining term of the Agreement as calculated in accordance with Section 4
hereof, payable in such manner and at the times as such salary would have been
payable to the Employee under Section 2 had he remained in the employ of' the
Association, (ii) his then applicable health insurance benefits for the
remaining term of the Agreement as calculated in accordance with Section 4
hereof, and (iii) his bonus determined on an annualized basis for the period
commencing on the first day of the fiscal year in which such termination occurs
and ending as of the month end closest to date of termination in such fiscal
year, which bonus shall be payable at such time as it would have been payable
under Section 2(b) had he remained in the employ of the Association.



                                     D-1-4
<PAGE>   5
         The terms "termination" or "involuntarily terminated" in this Agreement
shall refer to the termination of the employment of Employee without his express
written consent. In addition, a material diminution of or interference with the
Employee's duties, responsibilities and benefits, including, but not limited to,
those events constituting a loss of status as defined in Section 8(b), shall be
deemed and shall constitute an involuntary termination of employment to the same
extent as express notice of such involuntary termination.

         In case of termination of the Employee's employment for cause, the
Association shall pay the Employee his salary through the date of termination,
and the Association shall have no further obligation to the Employee under this
Agreement. The Employee shall have no right to receive compensation or other
benefits for any period after termination for cause. For purposes of this
Agreement, termination for "cause" shall include termination because of the
Employee's personal dishonesty, incompetence, willful misconduct, breach of a
fiduciary duty involving personal profit, intentional failure to perform stated
duties, willful violation of any material law, rule, or regulation (other than
traffic violations or similar offenses) or final cease-and-desist order, or
material breach of any provision of this Agreement. Notwithstanding the
foregoing, the Employee shall not be deemed to have been terminated for cause
unless and until there shall have been delivered to the Employee a copy of a
resolution, duly adopted by the affirmative vote of not less than a majority of
the entire membership of the Board of Directors of the Association at a meeting
of the Board called and held for such purpose (after reasonable notice to the
Employee and an opportunity for the Employee, together with the Employee's
counsel, to be heard before the Board), stating that in the good faith opinion
of the Board the Employee was guilty of conduct constituting "cause" as set
forth above and specifying the particulars thereof.

                   (b) The Employee's employment may be voluntarily terminated
         by the Employee at any time upon 90 days written notice to the
         Association or upon such shorter period as may be agreed upon between
         the Employee and the Board of Directors of the Association. In the
         event of such voluntary termination, except as provided in Section 8
         below, the Association shall be obligated to continue to pay the
         Employee his salary only through the date of termination together with
         any accrued unpaid vacation pay as of said date, at the time such
         payments are due, and the Association shall have no further obligation
         to the Employee under this Agreement.

                   (c) Notwithstanding any other provision of this Agreement to
         the contrary, Employee may voluntarily terminate his employment under
         this Agreement by written notice to the Association upon the
         occurrence, or within thirty (30) days thereafter, if the Employee
         suffers a loss of status, as defined in Section 8(b) hereof. Upon such
         termination Employee shall be entitled to receive his salary, and such
         group medical insurance coverage or reimbursement benefits provided for
         (and on the same terms as set forth) in Section 3(a) hereof, during the
         unexpired portion of the term of this Agreement (i.e., excluding any
         automatic extensions of the term hereof that would otherwise occur
         pursuant to Section 4 hereof subsequent to such termination), with such
         salary to be payable in such manner and at such times as such salary
         would have been payable to Employee under Section 4 had he remained in
         the employ of the Association. Except as set forth in the preceding
         sentence, Employee shall have no right to receive any other




                                     D-1-5
<PAGE>   6
         payments or benefits under this Agreement for any periods after the
         date of such termination.

                   (d) In the event of the death of the Employee during the term
         of employment under this Agreement and prior to any termination
         hereunder, the Employee's estate, or such person as the Employee may
         have previously designated in writing, shall be entitled to receive
         from the Association the salary of the Employee through the last day of
         the calendar month in which his death shall have occurred together with
         Employee's unused vacation and sick leave, and the term of employment
         under this Agreement shall end on such last day of the month.

                   (e) If the Employee is suspended from office and/or
         temporarily prohibited from participating in the conduct of the
         Association's affairs by a notice served under Section 8(e)(3) or
         (g)(1) of the Federal Deposit Insurance Act ("FDIA"), 12 U.S.C. Section
         1818(e)(3); (g)(1) (as amended from time to time), the Association's
         obligations under this Agreement shall be suspended as of the date of
         service, unless stayed by appropriate proceedings. If the charges in
         the notice are dismissed, the Association may in its discretion (i) pay
         the Employee all or part of the compensation withheld while its
         obligations under this Agreement were suspended and (ii) reinstate in
         whole or in part any of the obligations which were suspended.

                   (f) If the Employee is removed from office and/or permanently
         prohibited from participating in the conduct of the Association's
         affairs by an order issued under Section 8(e)(4) or (g)(1) of the FDIA,
         12 U.S.C. Section 1818(e)(4); (g)(1) (as amended from time to time),
         all obligations of the Association under this Agreement shall
         terminate, as of the effective date of the order, but vested rights of
         the Employee shall not be affected.

                   (g) If the Association becomes in default (as defined in
         Section 3(x)(1) of the FDIA, 12 U.S.C. Section 1813(x)(1) (as amended
         from time to time)), all obligations under this Agreement shall
         terminate as of the date of default, but this provision shall not
         affect any vested rights of the Employee.

                   (h) All obligations under this Agreement shall be terminated,
         except to the extent determined that continuation of this Agreement is
         necessary for the continued operation of the Association: (i) by the
         Director of the OTS or his or her designee at the time the Federal
         Deposit Insurance corporation ("FDIC") enters into an agreement to
         provide assistance to or on behalf of the Association under the
         authority contained in Section 13(c) of the FDIA, 12 U.S.C. Section
         1823(c) (as amended from time to time); or (ii) by the .Director of the
         OTS or his or her designee at the time the Director of the OTS or his
         or her designee approves a supervisory merger to resolve problems
         related to operation of the Association or when the Association is
         determined by the Director of the OTS to be in an unsafe or unsound
         condition. Any rights of the Employee that have already vested,
         however, shall not be affected by any such action.

                   (i) In the event the Association purports to terminate the
         Employee for cause, but it is determined by a court of competent
         jurisdiction that cause did not exist for




                                     D-1-6
<PAGE>   7
         such termination, or if in any event it is determined by any such court
         that the Association has failed to make timely payment of any amounts
         owed to the Employee under this Agreement, the Employee shall be
         entitled to reimbursement for all reasonable costs, including
         attorneys' fees, incurred in challenging such termination or collecting
         such amounts. Such reimbursement shall be in addition to all rights to
         which the Employee is otherwise entitled under this Agreement.

          7. Disability. If Employee shall become disabled or incapacitated to
the extent that he is unable to perform the duties of President and Chief
Executive Officer, and if such disability or incapacity shall have continued for
a period of ninety (90) consecutive days or longer, or if a physician selected
by the Board of Directors of 'the Association shall examine Employee and shall
state in writing that in his professional opinion such disability or incapacity
is likely to continue for a period of ninety (90) consecutive days or longer
after such opinion, then in either such event the Board of Directors may
terminate this Agreement upon written notice to Employee. Upon termination under
this Section 7, Employee shall be entitled to receive during the unexpired
portion of the term of this Agreement (i.e., excluding any automatic extensions
of the term hereof that would otherwise occur pursuant to Section 4 hereof
subsequent to such termination):

                   (a) seventy-five percent (75%) of his salary less the amount
         of any disability payments received by Employee during such period on
         account of disability insurance maintained for Employee's benefit by
         the Association at the Association's expense, with the reduced salary
         to be payable in such manner and at such times as such salary would
         have been payable to Employee under Section 2 had he remained in the
         employ of the Association; and

                   (b) such group medical insurance coverage or reimbursement
         benefits provided for (and on the same terms as set forth) in Section
         3(a) hereof.

         Except as set forth in the preceding sentence, Employee shall have no
right to receive any other payments or benefits under this Agreement for any
periods after the date of such termination other than pursuant to any disability
benefits of the type provided for executive employees of the Association, if
any.

          8. Change in Control. (a) Involuntary Termination. If both (i) a
change of control has occurred and (ii) the Employee's employment is
involuntarily terminated (other than for cause or pursuant to any of Sections
6(c) through 6(g) or Section 7 of this Agreement) in connection with or within
12 months after such change in control during the term of employment under this
Agreement, the Association shall pay to the Employee in a lump sum in cash
within 25 business days after the Date of Termination (as hereinafter defined)
of employment an amount equal to 299 percent of the Employee's then current
compensation.

         An involuntary termination shall include a loss of status in connection
with the change in control. A loss of status shall include, but not be limited
to: (1) a change in the principal workplace of the Employee to a location
outside of Burlington, Iowa; (2) a material reduction in the secretarial or
other administrative support of the Employee other than as part of a Association
or Mahaska company-wide reduction in staff; (3) a reduction or adverse change in
the Employee's





                                     D-1-7
<PAGE>   8
title or decision-making responsibilities; (4) a reduction in the number or
seniority of other Association personnel reporting to the Employee, other than
as part of an Association or Mahaska company-wide reorganization or reduction in
staff, or a reduction in the frequency with which, or in the nature of the
matters with respect to which, such personnel are to report to the Employee; (5)
an increase in the number of, or a decrease in the seniority of, the persons
(other than the Board of Directors) to whom the Employee must report, other than
is normal and customary for a President and Chief Executive Officer, or such
other, more senior, capacity as the Employee may be subsequently employed by the
Association, of a similarly situated financial institution or financial
institution holding company; (6) a reduction or adverse change in the salary,
perquisites, benefits, contingent benefits or vacation time which had
theretofore been provided to the Employee, other than as part of an overall
program applied uniformly and with equitable effect to all members of the senior
management of the Association or Mahaska; and (7) a material increase in the
required hours of work or the workload of the Employee.

                   (b) Definitions. For purposes of Sections 8, 9 and 11 of this
         Agreement, "Date of Termination" means the earlier of (i) the date upon
         which the Association gives notice to the Employee of the termination
         of his employment with the Association or (ii) the date upon which the
         Employee ceases to serve as an Employee of the Association, and "change
         in control" is defined solely as any acquisition of control (other than
         by a trustee or other fiduciary holding securities under an employee
         benefit plan of Mahaska or a subsidiary of Mahaska), as defined in 12
         C.F.R. Section 574.4, or any successor regulation, of the Association
         or Mahaska which would require the filing of an application for
         acquisition of control or notice of change in control in a manner as
         set forth in 12 C.F.R. Section 574.3, or any successor regulation.

                   (c) Compliance with Capital Requirements. Notwithstanding
         anything in this Agreement to the contrary, no payments may be made
         pursuant to Section 8 hereof without the prior approval of the OTS if
         following such payment the Association would not be in compliance with
         its fully phased-in capital requirements as defined in OTS regulations.

          9. Certain Reduction of Payments by the Association. (a) Anything in
this Agreement to the contrary notwithstanding, in the event it shall be
determined that any payment or distribution by the Association to or for the
benefit of the Employee (whether paid or payable or distributed or distributable
pursuant to the terms of this Agreement or otherwise) (a "Payment") would be
nondeductible (in whole or part) by the Association for Federal income tax
purposes because of Section 280G of the Internal Revenue Code of 1986, as
amended (the "Code"), then the aggregate present value of amounts payable or
distributable to or for the benefit of the Employee pursuant to this Agreement
(such amounts payable or distributable pursuant to this Agreement are
hereinafter referred to as "Agreement Payments") shall be reduced to the Reduced
Amount. The "Reduced Amount" shall be an amount, not less than zero, expressed
in present value which maximizes the aggregate present value of Agreement
Payments without causing any Payment to be nondeductible by the Association
because of Section 280G of the Code. For purposes of this Section 9, present
value shall be determined in accordance with Section 280G(d) (4) of the Code.



                                     D-1-8
<PAGE>   9
                   (b) All determinations required to be made under this Section
         9 shall be made by the Association's independent auditors, or at the
         election of such auditors by such other firm or individuals of
         recognized expertise as such auditors may select (such auditors or, if
         applicable, such other firm or individual, are hereinafter referred to
         as the "Advisory Firm"). The Advisory Firm shall within ten business
         days of the Date of Termination, or at such earlier time as is
         requested by the Association, provide to both the Association and the
         Employee an opinion (and detailed supporting calculations) that the
         Association has substantial authority to deduct for federal income tax
         purposes the full amount of the Agreement Payments and that the
         Employee has substantial authority not to report on his federal income
         tax return any excise tax imposed by Section 4999 of the Code with
         respect to the Agreement Payments. Any such determination and opinion
         by the Advisory Firm shall be binding upon the Association and the
         Employee. The Employee shall determine which and how much, if any, of
         the Agreement Payments shall be eliminated or reduced consistent with
         the requirements of this Section 9, provided that, if the Employee does
         not make such determination within ten business days of the receipt of
         the calculations made by the Advisory Firm, the Association shall elect
         which and how much, if any, of the Agreement Payments shall be
         eliminated or reduced consistent with the requirements of this Section
         9 and shall notify the Employee promptly of such election. Within five
         business days of the earlier of (i) the Association's receipt of the
         Employee's determination pursuant to the immediately preceding sentence
         of this Agreement or (ii) the Association's election in lieu of such
         determination, the Association shall pay to or distribute to or for the
         benefit of the Employee such amounts as are then due the Employee under
         this Agreement. The Association and the Employee shall cooperate fully
         with the Advisory Firm, including without limitation providing to the
         Advisory Firm all information and materials reasonably requested by it,
         in connection with the making of the determinations required under this
         Section 9.

                   (c) As a result of uncertainty in application of Section 280G
         of the Code at the time of the initial determination by the Advisory
         Firm hereunder, it is possible that Agreement Payments will have been
         made by the Association which should not have been made ("Overpayment")
         or that additional Agreement Payments will not have been made by the
         Association which should have been made ("Underpayment"), in each case,
         consistent with the calculations required to be made hereunder. In the
         event that the Advisory Firm, based upon the assertion by the Internal
         Revenue Service against the Employee of a deficiency which the Advisory
         Firm believes has a high probability of success determines that an
         overpayment has been made, any such Overpayment paid or distributed by
         the Association to or for the benefit of Employee shall be treated for
         all purposes as a loan ab initio which the Employee shall repay to the
         Association together with interest at the applicable federal rate
         provided for in Section 7872(f)(2) of the Code; provided, however, that
         no such loan shall be deemed to have been made and no amount shall be
         payable by the Employee to the Association if and to the extent such
         deemed loan and payment would not either reduce the amount on which the
         Employee is subject to tax under Section 1 and Section 4999 of the Code
         or generate a refund of such taxes. In the event that the Advisory
         Firm, based upon controlling preceding or other substantial authority,
         determines that an Underpayment has occurred, any such Underpayment
         shall





                                     D-1-9
<PAGE>   10
         be promptly paid by the Association to or for the benefit of the
         Employee together with interest at the applicable federal rate provided
         for in Section 7872(f)(2) of the Code.

                   (d) Payments Not To Exceed Three Times Annualized Salary.
         Notwithstanding anything in this Agreement to the contrary, in no event
         shall the sum of any payment to the Employee under Section 8 of this
         Agreement and any payments of salary and bonus under Section 6 of this
         Agreement exceed an amount that is three times the Employee's salary
         (annualized) as of the date of termination of employment. For this
         purpose, the amount of payments of salary and bonus to be made in the
         future under Section 6 shall be determined on a present value basis,
         and present value shall be determined as provided for in Section 9 of
         this Agreement.

         10. No Mitigation. The amount of any salary or other payment or benefit
provided for in this Agreement shall not be reduced by any compensation earned
by the Employee as the result of employment by another employer, by retirement
benefits after the date of termination, or otherwise.

         11. No Assignments. (a) This Agreement is personal to each of the
parties hereto, and neither party may assign or delegate any of its rights or
obligations hereunder without first obtaining the written consent of the other
party; provided, however, that the Association will require any successor or
assign (whether direct or indirect, by purchase, merger, consolidation or
otherwise) to all or substantially all of the business and/or assets of the
Association, by an assumption agreement in form and substance satisfactory to
the Employee, to expressly assume and agree to perform this Agreement in the
same manner and to the same extent that the Association would be required to
perform it if no such succession or assignment had taken place. Failure of the
Association to obtain such an assumption agreement prior to the effectiveness of
any such succession or assignment shall be a breach of this Agreement and shall
entitle the Employee to compensation from the Association in the same amount and
on the same terms as the compensation pursuant to Section 8(a) hereof. For
purposes of implementing the provisions of this Section 11(a), the date on which
any such succession becomes effective shall be deemed the Date of Termination.

                   (b) This Agreement and all rights of the Employee hereunder
         shall inure to the benefit of and be enforceable by the Employee's
         personal and legal representatives, executors, administrators,
         successors, heirs, distributees, devisees and legatees. If the Employee
         should die while any amounts would still be payable to the Employee
         hereunder if the Employee had continued to live, all such amounts,
         unless otherwise provided herein, shall be paid in accordance with the
         terms of this Agreement to the Employee's devisee, legatee or other
         designee or if there is no such designee, to the Employee's estate.

         12. Notice. For the purposes of this Agreement, notices and all other
communications provided for in the Agreement shall be in writing and shall be
deemed to have been duly given when personally delivered or by certified mail,
return receipt requested, postage prepaid, addressed to the respective addresses
set forth on the first page of this Agreement (provided that all notices to the
Association shall be directed to the attention of the Board of Directors of the



                                     D-1-10
<PAGE>   11
Association with a copy to the Secretary of the Association) or to such other
address as either party may have furnished to the other in writing in accordance
herewith.

         13. Amendments. No amendments or additions to this Agreement shall be
binding unless in writing and signed by both parties, except as herein otherwise
provided.

         14. Paragraph Headings. The paragraph headings used in this Agreement
are included solely for convenience and shall not affect, or be used in
connection with, the interpretation of this Agreement.

         15. Severability.. The provisions of this Agreement shall be deemed
severable and the invalidity or unenforceability of any provision shall not
affect the validity or enforceability of the other provisions hereof.

         16. Governing Law. This Agreement shall be governed by the laws of the
United States to the extent applicable and otherwise by the laws of the State of
Iowa.





                                     D-1-11
<PAGE>   12
         IN WITNESS WHEREOF, the parties have executed this Agreement as of the
day and year first above written.

                                     MIDWEST FEDERAL SAVINGS AND LOAN
                                       ASSOCIATION OF EASTERN IOWA


                                     By
                                                        , Chairman of the Board
                                         ---------------



                                     EMPLOYEE


                                     By
                                                         William D. Hassel




                                     D-1-12

<PAGE>   1

                                                                    EXHIBIT 10.2


                              EMPLOYMENT AGREEMENT

         THIS EMPLOYMENT AGREEMENT ("Agreement") is made and entered into as of
this ______ day of _______________, 199__, by and between MIDWEST FEDERAL
SAVINGS AND LOAN ASSOCIATION OF EASTERN IOWA, a federally chartered savings and
loan association whose address is 3225 Division Street, Burlington, Iowa 52601,
(which, together with any successor thereto which executes and delivers the
assumption agreement provided for in Section 11(a) hereof or which otherwise
becomes bound by the terms and provisions of this Agreement by operation of law,
is hereinafter referred to as the "Association"), and ROBERT D. MASCHMANN whose
residence address is 12916 Flint Bottom Road, Burlington, Iowa (the "Employee").

         WHEREAS, the Employee has served as Executive Vice President and Chief
Financial Officer of the Association and Midwest Bancshares, Inc.; and

         WHEREAS, the Association is being merged with and into Mahaska
Investment Company ("Mahaska"); and

         WHEREAS, Employee is willing to release any rights which he may have
pursuant to his Employment Agreement dated November 10, 1992, upon Closing of
the merger in consideration for the execution of this Agreement and payment of
the cash which Employee is entitled to receive at Closing; and

         WHEREAS, the Board of Directors of the Association recognizes that the
possibility of a change in control of Mahaska or the Association may exist and
that such possibility, and the uncertainty and questions which it may raise
among management, may result in the departure or distraction of key management
personnel to the detriment of the Association, Mahaska and its stockholders; and

         WHEREAS, the Board of Directors of the Association desires to provide
certain benefits to the Employee following his involuntary termination of
employment after a change of control of the Association or Mahaska; and

         WHEREAS, the Board of Directors of the Association believes it is in
the best interests of the Association to enter into this Agreement with the
Employee in order to assure continuity of management of the Association and to
reinforce and encourage the continued attention and dedication of the Employee
to his assigned duties without distraction in the face of potentially disruptive
circumstances arising from the possibility of a change in control of Mahaska or
the Association, although no such change is now contemplated; and

         WHEREAS, the Board of Directors of the Association has approved and
authorized the execution of this Agreement with the Employee to take effect as
stated in Section 4 hereof;

         NOW, THEREFORE, in consideration of the foregoing and of the respective
covenants and agreements of the parties herein contained, it is AGREED as
follows:


                                   EXHIBIT D
                             (to Merger Agreement)

<PAGE>   2
          1. Employment. The Employee will be employed as Executive Vice
President and Chief Financial Officer of the Association, or in such other more
senior capacity as the Board of Directors may subsequently determine. As
Executive Vice President and Chief Financial Officer, Employee shall render
administrative and management services as are customarily performed by persons
situated in similar executive capacities, and shall have other powers and duties
as may from time to time be prescribed by the Board, provided that such duties
are consistent with the Employee's position. The Employee shall continue to
devote his best efforts and substantially all his business time and attention to
the business and affairs of the Association and its subsidiaries and affiliated
companies.

          2. Compensation.

         (a) Salary. The Association agrees to pay the Employee during the term
of this Agreement a salary established by the Board of Directors. The salary
hereunder as of the Commencement Date (as defined in Section 4 hereof) shall be
$94,500. The salary provided for herein shall be payable in cash not less
frequently than bi-monthly in accordance with the practices of the Association;
provided, however, that no such salary is required to be paid by the terms of
this Agreement in respect of any month or portion thereof subsequent to the
termination of this Agreement, and provided further, that the amount of such
salary shall be reviewed by the Association not less often than annually and may
be increased (but not decreased) from time to time in such amounts as the Board
of Directors in its discretion may decide, subject to the customary withholding
tax and other employee taxes as required with respect to compensation paid by a
corporation to an employee.

         (b) Discretionary Bonuses. The Employee shall be entitled to
participate in an equitable manner with all other executive officers of the
Association in discretionary bonuses as authorized and declared by the Board of
Directors of the Association to its executive employees. No other compensation
provided for in this Agreement shall be deemed a substitute for the Employee's
right to participate in such bonuses when and as declared by the Board of
Directors. Association agrees to maintain a comparable bonus program to the
program maintained by Mahaska for its executive employees and the executive
employees of its subsidiaries.

         (c) Expenses. During the term of his employment hereunder, the Employee
shall be entitled to receive prompt reimbursement for all reasonable expenses
incurred by him (in accordance with policies and procedures at least as
favorable to the Employee as those presently applicable to the senior executive
officers of the Association) in performing services hereunder, provided that the
Employee properly accounts therefor in accordance with Association policy.

          3. Benefits.

         (a) Participation in Retirement and Employee Benefit Plans. The
Employee shall be entitled while employed hereunder to participate equitably in,
and receive benefits under, all plans relating to stock options, stock
purchases, pension, thrift, profit-sharing, group life insurance, medical
coverage, education, cash or stock bonuses, and other retirement or employee
benefits or combinations thereof, that are now or hereafter maintained for the
benefit of the Association's executive employees or for its employees generally.

                                     D-2-2
<PAGE>   3
         (b) Fringe Benefits. The Employee shall be eligible while employed
hereunder to participate in, and receive benefits under, any other fringe
benefits which are or may become applicable to the Association's executive
employees or to its employees generally, including a reasonable expense account
and continued payment by the Association of Employee's dues for membership in
the Burlington Golf Club.

         (c) Retirement, Employee Benefit Plans and Fringe Benefits. Association
agrees to maintain retirement, employee benefit plans and fringe benefit
programs comparable to the programs maintained by Mahaska for its executive
employees and the executive employees of its subsidiaries.

          4. Term. The term of employment under this Agreement shall be a period
of 36 months commencing on the closing date of the merger (the "Commencement
Date"), subject to earlier termination as provided herein. Beginning on the
first anniversary of the Commencement Date, and on each anniversary thereafter,
the term of employment under this Agreement shall be extended, subject to the
next sentence of this paragraph, for a period of one year unless either the
Association or the Employee gives contrary written notice to the other not less
than 90 days in advance of the date on which the term of employment under this
Agreement would otherwise be extended. This Agreement will not be automatically
extended unless such extension is approved by the Board of Directors of the
Association following the Board's review of a formal performance evaluation of
the Employee performed by the disinterested members of the Board of Directors of
the Association and reflected in the minutes of the Board of Directors.
Reference herein to the term of employment under this Agreement shall refer to
both such initial term and such extended terms. As of the Commencement Date,
that certain Employment Agreement entered into between the Association and
Employee dated November 10, 1992, shall terminate and have no further force or
effect.

          5. Vacations. The Employee shall be entitled, without loss of pay, to
absent himself voluntarily from the performance of his employment under this
Agreement, all such voluntary absences to count as vacation time, provided that:

                  (a) During the term of employment under this Agreement, the
         Employee shall be entitled to an annual paid vacation of four weeks,
         or, if more favorable to Employee, in accordance with the most
         favorable plans, policies, programs or practices of the Association and
         its affiliated companies as in effect for the Association at any time
         during the six month period immediately preceding the Commencement
         Date, or as in effect generally at any time thereafter with respect to
         other senior executives of the association and its affiliated
         companies;

                  (b) The timing of vacations shall be scheduled in a reasonable
         manner by the Employee;

                  (c) The Board of Directors shall, solely at the Employee's
         request, be entitled to grant to the Employee a leave or leaves of
         absence with or without pay at such time or times and upon such terms
         and conditions as the Board of Directors, in its discretion, may
         determine; and



                                     D-2-3
<PAGE>   4
                  (d) Association agrees to maintain a vacation program
         comparable to the program maintained by Mahaska for its executive
         employees and the executive employees of its subsidiaries.

          6. Termination of Employment; Death. (a) The Board of Directors may
terminate the Employee's employment at any time, but any termination by the
Association's Board of Directors, other than termination for cause, shall not
prejudice the Employee's right to compensation or other benefits under the
Agreement. If the employment of the Employee is involuntarily terminated, other
than (i) for "cause" as provided in this Section 6(a) or (ii) by reason of death
or disability as provided in Sections 6(c) or 7, or if there occurs a voluntary
or involuntary termination of the Employee's employment as defined in Section 8
in connection with or within 12 months after a change in control which occurs at
any time during the term of this Agreement as provided in Section 8, the
Employee shall be entitled to receive, (i) his then applicable salary for the
remaining term of the Agreement as calculated in accordance with Section 4
hereof, payable in such manner and at the times as such salary would have been
payable to the Employee under Section 2 had he remained in the employ of' the
Association, (ii) his then applicable health insurance benefits for the
remaining term of the Agreement as calculated in accordance with Section 4
hereof, and (iii) his bonus determined on an annualized basis for the period
commencing on the first day of the fiscal year in which such termination occurs
and ending as of the month end closest to date of termination in such fiscal
year, which bonus shall be payable at such time as it would have been payable
under Section 2(b) had he remained in the employ of the Association.

         The terms "termination" or "involuntarily terminated" in this Agreement
shall refer to the termination of the employment of Employee without his express
written consent. In addition, a material diminution of or interference with the
Employee's duties, responsibilities and benefits, including, but not limited to,
those events constituting a loss of status as defined in Section 8(b), shall be
deemed and shall constitute an involuntary termination of employment to the same
extent as express notice of such involuntary termination.

         In case of termination of the Employee's employment for cause, the
Association shall pay the Employee his salary through the date of termination,
and the Association shall have no further obligation to the Employee under this
Agreement. The Employee shall have no right to receive compensation or other
benefits for any period after termination for cause. For purposes of this
Agreement, termination for "cause" shall include termination because of the
Employee's personal dishonesty, incompetence, willful misconduct, breach of a
fiduciary duty involving personal profit, intentional failure to perform stated
duties, willful violation of any material law, rule, or regulation (other than
traffic violations or similar offenses) or final cease-and-desist order, or
material breach of any provision of this Agreement. Notwithstanding the
foregoing, the Employee shall not be deemed to have been terminated for cause
unless and until there shall have been delivered to the Employee a copy of a
resolution, duly adopted by the affirmative vote of not less than a majority of
the entire membership of the Board of Directors of the Association at a meeting
of the Board called and held for such purpose (after reasonable notice to the
Employee and an opportunity for the Employee, together with the Employee's
counsel, to be heard before the Board), stating that in the good faith opinion
of the Board the Employee was guilty of conduct constituting "cause" as set
forth above and specifying the particulars thereof.



                                     D-2-4
<PAGE>   5
         (b) The Employee's employment may be voluntarily terminated by the
Employee at any time upon 90 days written notice to the Association or upon such
shorter period as may be agreed upon between the Employee and the Board of
Directors of the Association. In the event of such voluntary termination, except
as provided in Section 8 below, the Association shall be obligated to continue
to pay the Employee his salary only through the date of termination together
with any accrued unpaid vacation pay as of said date, at the time such payments
are due, and the Association shall have no further obligation to the Employee
under this Agreement.

         (c) Notwithstanding any other provision of this Agreement to the
contrary, Employee may voluntarily terminate his employment under this Agreement
by written notice to the Association upon the occurrence, or within thirty (30)
days thereafter, if the Employee suffers a loss of status, as defined in Section
8(b) hereof. Upon such termination Employee shall be entitled to receive his
salary, and such group medical insurance coverage or reimbursement benefits
provided for (and on the same terms as set forth) in Section 3(a) hereof, during
the unexpired portion of the term of this Agreement (i.e., excluding any
automatic extensions of the term hereof that would otherwise occur pursuant to
Section 4 hereof subsequent to such termination), with such salary to be payable
in such manner and at such times as such salary would have been payable to
Employee under Section 4 had he remained in the employ of the Association.
Except as set forth in the preceding sentence, Employee shall have no right to
receive any other payments or benefits under this Agreement for any periods
after the date of such termination.

         (d) In the event of the death of the Employee during the term of
employment under this Agreement and prior to any termination hereunder, the
Employee's estate, or such person as the Employee may have previously designated
in writing, shall be entitled to receive from the Association the salary of the
Employee through the last day of the calendar month in which his death shall
have occurred together with Employee's unused vacation and sick leave, and the
term of employment under this Agreement shall end on such last day of the month.

         (e) If the Employee is suspended from office and/or temporarily
prohibited from participating in the conduct of the Association's affairs by a
notice served under Section 8(e)(3) or (g)(1) of the Federal Deposit Insurance
Act ("FDIA"), 12 U.S.C. Section 1818(e)(3); (g)(1) (as amended from time to
time), the Association's obligations under this Agreement shall be suspended as
of the date of service, unless stayed by appropriate proceedings. If the charges
in the notice are dismissed, the Association may in its discretion (i) pay the
Employee all or part of the compensation withheld while its obligations under
this Agreement were suspended and (ii) reinstate in whole or in part any of the
obligations which were suspended.

         (f) If the Employee is removed from office and/or permanently
prohibited from participating in the conduct of the Association's affairs by an
order issued under Section 8(e)(4) or (g)(1) of the FDIA, 12 U.S.C. Section
1818(e)(4); (g)(1) (as amended from time to time), all obligations of the
Association under this Agreement shall terminate, as of the effective date of
the order, but vested rights of the Employee shall not be affected.

         (g) If the Association becomes in default (as defined in Section
3(x)(1) of the FDIA, 12 U.S.C. Section 1813(x)(1) (as amended from time to
time)), all obligations under this Agreement shall





                                     D-2-5
<PAGE>   6
terminate as of the date of default, but this provision shall not affect any
vested rights of the Employee.

         (h) All obligations under this Agreement shall be terminated, except to
the extent determined that continuation of this Agreement is necessary for the
continued operation of the Association: (i) by the Director of the OTS or his or
her designee at the time the Federal Deposit Insurance corporation ("FDIC")
enters into an agreement to provide assistance to or on behalf of the
Association under the authority contained in Section 13(c) of the FDIA, 12
U.S.C. Section 1823(c) (as amended from time to time); or (ii) by the Director
of the OTS or his or her designee at the time the Director of the OTS or his or
her designee approves a supervisory merger to resolve problems related to
operation of the Association or when the Association is determined by the
Director of the OTS to be in an unsafe or unsound condition. Any rights of the
Employee that have already vested, however, shall not be affected by any such
action.

         (i) In the event the Association purports to terminate the Employee for
cause, but it is determined by a court of competent jurisdiction that cause did
not exist for such termination, or if in any event it is determined by any such
court that the Association has failed to make timely payment of any amounts owed
to the Employee under this Agreement, the Employee shall be entitled to
reimbursement for all reasonable costs, including attorneys' fees, incurred in
challenging such termination or collecting such amounts. Such reimbursement
shall be in addition to all rights to which the Employee is otherwise entitled
under this Agreement.

          7. Disability. If Employee shall become disabled or incapacitated to
the extent that he is unable to perform the duties of Executive Vice President
and Chief Financial Officer, and if such disability or incapacity shall have
continued for a period of ninety (90) consecutive days or longer, or if a
physician selected by the Board of Directors of the Association shall examine
Employee and shall state in writing that in his professional opinion such
disability or incapacity is likely to continue for a period of ninety (90)
consecutive days or longer after such opinion, then in either such event the
Board of Directors may terminate this Agreement upon written notice to Employee.
Upon termination under this Section 7, Employee shall be entitled to receive
during the unexpired portion of the term of this Agreement (i.e., excluding any
automatic extensions of the term hereof that would otherwise occur pursuant to
Section 4 hereof subsequent to such termination):

                   (a) seventy-five percent (75%) of his salary less the amount
         of any disability payments received by Employee during such period on
         account of disability insurance maintained for Employee's benefit by
         the Association at the Association's expense, with the reduced salary
         to be payable in such manner and at such times as such salary would
         have been payable to Employee under Section 2 had he remained in the
         employ of the Association; and

                   (b) such group medical insurance coverage or reimbursement
         benefits provided for (and on the same terms as set forth) in Section
         3(a) hereof.

Except as set forth in the preceding sentence, Employee shall have no right to
receive any other payments or benefits under this Agreement for any periods
after the date of such termination other






                                     D-2-6
<PAGE>   7
than pursuant to any disability benefits of the type provided for executive
employees of the Association, if any.

          8. Change in Control.

         (a) Involuntary Termination. If both (i) a change of control has
occurred and (ii) the Employee's employment is involuntarily terminated (other
than for cause or pursuant to any of Sections 6(c) through 6(g) or Section 7 of
this Agreement) in connection with or within 12 months after such change in
control during the term of employment under this Agreement, the Association
shall pay to the Employee in a lump sum in cash within 25 business days after
the Date of Termination (as hereinafter defined) of employment an amount equal
to 299 percent of the Employee's then current compensation.

         An involuntary termination shall include a loss of status in connection
with the change in control. A loss of status shall include, but not be limited
to: (1) a change in the principal workplace of the Employee to a location
outside of Burlington, Iowa; (2) a material reduction in the secretarial or
other administrative support of the Employee other than as part of a Association
or Mahaska company-wide reduction in staff; (3) a reduction or adverse change in
the Employee's title or decision-making responsibilities; (4) a reduction in the
number or seniority of other Association personnel reporting to the Employee,
other than as part of an Association or Mahaska company-wide reorganization or
reduction in staff, or a reduction in the frequency with which, or in the nature
of the matters with respect to which, such personnel are to report to the
Employee; (5) an increase in the number of, or a decrease in the seniority of,
the persons (other than the Board of Directors) to whom the Employee must
report, other than is normal and customary for a Executive Vice President and
Chief Financial Officer, or such other, more senior, capacity as the Employee
may be subsequently employed by the Association, of a similarly situated
financial institution or financial institution holding company; (6) a reduction
or adverse change in the salary, perquisites, benefits, contingent benefits or
vacation time which had theretofore been provided to the Employee, other than as
part of an overall program applied uniformly and with equitable effect to all
members of the senior management of the Association or Mahaska; and (7) a
material increase in the required hours of work or the workload of the Employee.

         (b) Definitions. For purposes of Sections 8, 9 and 11 of this
Agreement, "Date of Termination" means the earlier of (i) the date upon which
the Association gives notice to the Employee of the termination of his
employment with the Association or (ii) the date upon which the Employee ceases
to serve as an Employee of the Association, and "change in control" is defined
solely as any acquisition of control (other than by a trustee or other fiduciary
holding securities under an employee benefit plan of Mahaska or a subsidiary of
Mahaska), as defined in 12 C.F.R. Section 574.4, or any successor regulation, of
the Association or Mahaska which would require the filing of an application for
acquisition of control or notice of change in control in a manner as set forth
in 12 C.F.R. Section 574.3, or any successor regulation.

         (c) Compliance with Capital Requirements. Notwithstanding anything in
this Agreement to the contrary, no payments may be made pursuant to Section 8
hereof without the prior approval of the OTS if following such payment the
Association would not be in compliance with its fully phased-in capital
requirements as defined in OTS regulations.

                                     D-2-7
<PAGE>   8
          9. Certain Reduction of Payments by the Association. (a) Anything in
this Agreement to the contrary notwithstanding, in the event it shall be
determined that any payment or distribution by the Association to or for the
benefit of the Employee (whether paid or payable or distributed or distributable
pursuant to the terms of this Agreement or otherwise) (a "Payment") would be
nondeductible (in whole or part) by the Association for Federal income tax
purposes because of Section 280G of the Internal Revenue Code of 1986, as
amended (the "Code"), then the aggregate present value of amounts payable or
distributable to or for the benefit of the Employee pursuant to this Agreement
(such amounts payable or distributable pursuant to this Agreement are
hereinafter referred to as "Agreement Payments") shall be reduced to the Reduced
Amount. The "Reduced Amount" shall be an amount, not less than zero, expressed
in present value which maximizes the aggregate present value of Agreement
Payments without causing any Payment to be nondeductible by the Association
because of Section 280G of the Code. For purposes of this Section 9, present
value shall be determined in accordance with Section 280G(d) (4) of the Code.

         (b) All determinations required to be made under this Section 9 shall
be made by the Association's independent auditors, or at the election of such
auditors by such other firm or individuals of recognized expertise as such
auditors may select (such auditors or, if applicable, such other firm or
individual, are hereinafter referred to as the "Advisory Firm"). The Advisory
Firm shall within ten business days of the Date of Termination, or at such
earlier time as is requested by the Association, provide to both the Association
and the Employee an opinion (and detailed supporting calculations) that the
Association has substantial authority to deduct for federal income tax purposes
the full amount of the Agreement Payments and that the Employee has substantial
authority not to report on his federal income tax return any excise tax imposed
by Section 4999 of the Code with respect to the Agreement Payments. Any such
determination and opinion by the Advisory Firm shall be binding upon the
Association and the Employee. The Employee shall determine which and how much,
if any, of the Agreement Payments shall be eliminated or reduced consistent with
the requirements of this Section 9, provided that, if the Employee does not make
such determination within ten business days of the receipt of the calculations
made by the Advisory Firm, the Association shall elect which and how much, if
any, of the Agreement Payments shall be eliminated or reduced consistent with
the requirements of this Section 9 and shall notify the Employee promptly of
such election. Within five business days of the earlier of (i) the Association's
receipt of the Employee's determination pursuant to the immediately preceding
sentence of this Agreement or (ii) the Association's election in lieu of such
determination, the Association shall pay to or distribute to or for the benefit
of the Employee such amounts as are then due the Employee under this Agreement.
The Association and the Employee shall cooperate fully with the Advisory Firm,
including without limitation providing to the Advisory Firm all information and
materials reasonably requested by it, in connection with the making of the
determinations required under this Section 9.

         (c) As a result of uncertainty in application of Section 280G of the
Code at the time of the initial determination by the Advisory Firm hereunder, it
is possible that Agreement Payments will have been made by the Association which
should not have been made ("Overpayment") or that additional Agreement Payments
will not have been made by the Association which should have been made
("Underpayment"), in each case, consistent with the calculations required to be
made hereunder. In the event that the Advisory Firm, based upon the assertion by
the Internal




                                     D-2-8
<PAGE>   9
Revenue Service against the Employee of a deficiency which the Advisory Firm
believes has a high probability of success determines that an overpayment has
been made, any such Overpayment paid or distributed by the Association to or for
the benefit of Employee shall be treated for all purposes as a loan ab initio
which the Employee shall repay to the Association together with interest at the
applicable federal rate provided for in Section 7872(f)(2) of the Code;
provided, however, that no such loan shall be deemed to have been made and no
amount shall be payable by the Employee to the Association if and to the extent
such deemed loan and payment would not either reduce the amount on which the
Employee is subject to tax under Section 1 and Section 4999 of the Code or
generate a refund of such taxes. In the event that the Advisory Firm, based upon
controlling preceding or other substantial authority, determines that an
Underpayment has occurred, any such Underpayment shall be promptly paid by the
Association to or for the benefit of the Employee together with interest at the
applicable federal rate provided for in Section 7872(f)(2) of the Code.

         (d) Payments Not to Exceed Three Times Annualized Salary.
Notwithstanding anything in this Agreement to the contrary, in no event shall
the sum of any payment to the Employee under Section 8 of this Agreement and any
payments of salary and bonus under Section 6 of this Agreement exceed an amount
that is three times the Employee's salary (annualized) as of the date of
termination of employment. For this purpose, the amount of payments of salary
and bonus to be made in the future under Section 6 shall be determined on a
present value basis, and present value shall be determined as provided for in
Section 9 of this Agreement.

         10. No Mitigation. The amount of any salary or other payment or benefit
provided for in this Agreement shall not be reduced by any compensation earned
by the Employee as the result of employment by another employer, by retirement
benefits after the date of termination, or otherwise.

         11. No Assignments. (a) This Agreement is personal to each of the
parties hereto, and neither party may assign or delegate any of its rights or
obligations hereunder without first obtaining the written consent of the other
party; provided, however, that the Association will require any successor or
assign (whether direct or indirect, by purchase, merger, consolidation or
otherwise) to all or substantially all of the business and/or assets of the
Association, by an assumption agreement in form and substance satisfactory to
the Employee, to expressly assume and agree to perform this Agreement in the
same manner and to the same extent that the Association would be required to
perform it if no such succession or assignment had taken place. Failure of the
Association to obtain such an assumption agreement prior to the effectiveness of
any such succession or assignment shall be a breach of this Agreement and shall
entitle the Employee to compensation from the Association in the same amount and
on the same terms as the compensation pursuant to Section 8(a) hereof. For
purposes of implementing the provisions of this Section 11(a), the date on which
any such succession becomes effective shall be deemed the Date of Termination.

         (b) This Agreement and all rights of the Employee hereunder shall inure
to the benefit of and be enforceable by the Employee's personal and legal
representatives, executors, administrators, successors, heirs, distributees,
devisees and legatees. If the Employee should die while any amounts would still
be payable to the Employee hereunder if the Employee had





                                     D-2-9
<PAGE>   10
continued to live, all such amounts, unless otherwise provided herein, shall be
paid in accordance with the terms of this Agreement to the Employee's devisee,
legatee or other designee or if there is no such designee, to the Employee's
estate.

         12. Notice. For the purposes of this Agreement, notices and all other
communications provided for in the Agreement shall be in writing and shall be
deemed to have been duly given when personally delivered or by certified mail,
return receipt requested, postage prepaid, addressed to the respective addresses
set forth on the first page of this Agreement (provided that all notices to the
Association shall be directed to the attention of the Board of Directors of the
Association with a copy to the Secretary of the Association) or to such other
address as either party may have furnished to the other in writing in accordance
herewith.

         13. Amendments. No amendments or additions to this Agreement shall be
binding unless in writing and signed by both parties, except as herein otherwise
provided.

         14. Paragraph Headings. The paragraph headings used in this Agreement
are included solely for convenience and shall not affect, or be used in
connection with, the interpretation of this Agreement.

         15. Severability. The provisions of this Agreement shall be deemed
severable and the invalidity or unenforceability of any provision shall not
affect the validity or enforceability of the other provisions hereof.

         16. Governing Law. This Agreement shall be governed by the laws of the
United States to the extent applicable and otherwise by the laws of the State of
Iowa.




                                     D-2-10
<PAGE>   11
         IN WITNESS WHEREOF, the parties have executed this Agreement as of the
day and year first above written.

                                     MIDWEST FEDERAL SAVINGS AND LOAN
                                       ASSOCIATION OF EASTERN IOWA


                                     By
                                                        , Chairman of the Board
                                         ---------------



                                     EMPLOYEE


                                     By
                                                            Robert D. Maschmann






                                     D-2-11

<PAGE>   1
                                                                    EXHIBIT 23.1











                         CONSENT OF INDEPENDENT AUDITORS


The Board of Directors
Mahaska Investment Company:

We consent to the inclusion and incorporation by reference in the Registration
Statement on Form S-4 of Mahaska Investment Company of our report dated February
12, 1999, relating to the consolidated balance sheets of Mahaska Investment
Company and subsidiaries as of December 31, 1998 and 1997, and the related
consolidated statements of income, changes in shareholders' equity and
comprehensive income, and cash flows for each of the years in the three-year
period ended December 31, 1998, and to the reference to our firm under the
headings "The Merger Agreement-Federal Income Tax Consequences", "The Merger
Agreement-Accounting Treatment of the Merger", and "Experts" in the joint proxy
statement/prospectus.


KPMG LLP
Des Moines, Iowa
May 24, 1999



<PAGE>   1
                                                                    EXHIBIT 23.2











                         CONSENT OF INDEPENDENT AUDITORS


The Board of Directors
Midwest Bancshares, Inc.:

We consent to the inclusion and incorporation by reference in the Registration
Statement on Form S-4 of Mahaska Investment Company of our report dated January
22, 1999, except for note 16, which is as of February 2, 1999, relating to the
consolidated balance sheets of Midwest Bancshares, Inc. and subsidiaries as of
December 31, 1998 and 1997, and the related consolidated statements of
operations, stockholders' equity and comprehensive income, and cash flows for
each of the years in the three-year period ended December 31, 1998, and to the
reference to our firm under the heading "Experts" in the joint proxy
statement/prospectus.


KPMG LLP
Des Moines, Iowa
May 24, 1999


<PAGE>   1

                                                                    Exhibit 23.4
                                                   Howe Barnes Investments, Inc.
                                                        135 South LaSalle Street
                                                         Chicago, Illinois 60603
May 24, 1999
Mahaska Investment Company
222 First Avenue East
Oslenlooa, Iowa  52577

   Re:         Joint Proxy Statement of Mahaska Investment Company
                          and Midwest Bancshares, Inc.
        Registration Statement on Form S-4 of Mahaska Investment Company

Ladies and Gentlemen:

     We hereby consent to the use of our opinion letter dated February 2, 1999
to the Board of Directors of Mahaska Investment Company as Annex III to the
Joint Statement and to the references therein to our opinion. In giving this
consent, we do not admit that we come within the category of persons whose
consent is required under Section 7 of the Securities Act of 1933, as amended,
or the rules and regulations of the Securities and Exchange Commission
thereunder, nor do we thereby admit that we are experts with respect to any part
of such Registration Statement within the meaning of the term "experts" as used
in the Securities Act of 1933, as amended or the rules and regulations of the
Securities and Exchange Commission thereunder.

                                    HOWE BARNES INVESTMENTS, INC.



                                    By /s/ Daniel E. Coughlin
                                       -------------------------------
                                       Name:  Daniel E. Coughlin
                                       Title: Senior Vice President


                                      II-7

<PAGE>   1

                                                                    Exhibit 23.5
                                                          Charles Webb & Company
                                                            211 Bradenton Avenue
                                                              Dublin, Ohio 43017

May 24, 1999

Mahaska Investment Company
222 First Avenue East
Oslenlooa, Iowa  52577
     Re:       Joint Proxy Statement of Mahaska Investment Company
                          and Midwest Bancshares, Inc.
        Registration Statement on Form S-4 of Mahaska Investment Company

Ladies and Gentlemen:

     We hereby consent to the use of our opinion letter dated February 2, 1999
to the Board of Directors of Mahaska Investment Company as Annex IV to the Joint
Statement and to the references therein to our opinion. In giving this consent,
we do not admit that we come within the category of persons whose consent is
required under Section 7 of the Securities Act of 1933, as amended, or the rules
and regulations of the Securities and Exchange Commission thereunder, nor do we
thereby admit that we are experts with respect to any part of such Registration
Statement within the meaning of the term "experts" as used in the Securities Act
of 1933, as amended or the rules and regulations of the Securities and Exchange
Commission thereunder.

                                    CHARLES WEBB & COMPANY,
                                    A Division of Keefe, Bruyette & Woods, Inc.

                                    By /s/ Patricia A. McJoynt
                                       ----------------------------------------
                                       Name: Patricia A. McJoynt
                                       Title: Executive Vice President


                                      II-8

<PAGE>   1

                                                                    Exhibit 23.6

                          CONSENT OF WILLIAM D. HASSEL

     In connection with this Registration Statement on Form S-4, the undersigned
hereby consents to the naming by the registrant of the undersigned as director
designee of the combined company. In giving such consent, the undersigned does
not thereby admit that he comes within the category of persons whose consent is
required under Section 7 of the Securities Act of 1933, or the rules and
regulations of the Securities and Exchange Commission thereunder Burlington,
Iowa May 21, 1999

                                    WILLIAM D. HASSEL


                                    By /s/ William D. Hassel
                                       -----------------------------------------
                                       William D. Hassel
                                       Director-nominee


                                      II-9

<PAGE>   1
                                                                   EXHIBIT 99.1

Mahaska Investment Company
222 First Avenue East
Oskaloosa, Iowa  52577


          THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

      The undersigned shareholder of Mahaska Investment Company, a
___________ corporation, hereby acknowledges receipt of the Notice of Special
Meeting of Shareholders and the Joint Proxy Statement, each dated
____________, 1999, and hereby appoints Charles S. Howard and David A.
Meinert and each of them, proxies and attorneys-in-fact, with full power to
each of substitution, on behalf and in the name of the undersigned, to
represent the undersigned at the Special Meeting of Shareholders of Mahaska
Investment Company to be held on ____________, 1999 at 2:00 p.m., local time,
at the Elmhurst Country Club, 2214 South 11th Street, Oskaloosa, Iowa 52577,
and any adjournmentss thereof, and to vote all shares of Common Stock of
Mahaska Investment Company which the undersigned would be entitled to vote if
then and there personally present, on the matters set forth below.

      THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED
HEREIN BY THE UNDERSIGNED SHAREHOLDER.  IF NO DIRECTION IS MADE, THIS PROXY
WILL BE VOTED "FOR" PROPOSAL 1.

             DETACH BELOW AND RETURN USING THE ENVELOPE PROVIDED.

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


                          MAHASKA INVESTMENT COMPANY

      PROXY CARD FOR SPECIAL MEETING ON ____________, 1999.

      (1)   To approve an Agreement and Plan of Merger, dated as of February
2, 1999, by and between Mahaska and Midwest Bancshares, Inc., which provides,
among other things, for the merger of Midwest with and into Mahaska, as
described in the accompanying Joint Proxy Statement/Prospectus.

                                     [ ]  For   [ ]  Against  [ ]  Abstain

      (2)   IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON SUCH
OTHER BUSINESS AS MAY PROPERLY COME BEFORE THE MEETING.

<PAGE>   2
Page 2

<TABLE>
<S>                                    <C>
Dated:_________________________          No. of Shares:________________________

Address Change?
Mark box [ ]     Name Change?[ ]
Indicate changes below:

                                       Signature(s) in Box

                                       Please sign exactly as your name
                                       appears on this card.  When shares are
                                       held by joint tenants, both should
                                       sign.  When signing as attorney,
                                       executor, administrator, trustee or
                                       guardian, please give your full title
                                       as such.  If a corporation, please
                                       sign in corporate name by president or
                                       other authorized officer.  If a
                                       partnership, please sign in
                                       partnership name by authorized person.
</TABLE>

Please vote, sign, date and return this proxy promptly.


<PAGE>   1
                                                                    EXHIBIT 99.2

                                REVOCABLE PROXY

                           MIDWEST BANCSHARES, INC.

                        ANNUAL MEETING OF STOCKHOLDERS
                       to be Held on ____________, 1999

      The undersigned hereby appoints the Board of Directors of Midwest
Bancshares, Inc. (the "Company"), with full powers of substitution, to act as
attorneys and proxies for the undersigned to vote all shares of capital stock of
the Company which the undersigned is entitled to vote at the Annual Meeting of
Stockholders (the "Meeting") to be held at the main office of the Company, 3225
Division Street, Burlington, Iowa, on ____________, 1999 at 2:00 p.m. Central
time, and at any and all adjournments and postponements thereof.

      1.    The adoption of the Agreement and Plan of Merger (the "Merger
            Agreement"), dated as of February 2, 1999, by and between Mahaska
            Investment Company and the Company


                FOR                 AGAINST                 ABSTAIN

      2.    The election as directors of all nominees listed below (except as
            marked to the contrary)

                        FOR              VOTE WITHHELD

            INSTRUCTION:     TO WITHHOLD YOUR VOTE FOR ANY INDIVIDUAL
            NOMINEE, STRIKE A LINE IN THAT NOMINEE'S NAME IN THE LIST BELOW.

                  HENRY L. HIRSCH                    ROBERT D. MASCHMANN

      3.    The ratification of the appointment of KPMG Peat Marwick LLP as
            auditors of the Company for the fiscal year ending December 31, 1999

                FOR                 AGAINST                 ABSTAIN

      In their discretion, the proxies are authorized to vote on any other
business that may properly come before the Meeting or any adjournment or
postponement thereof.

THIS PROXY WILL BE VOTED AS DIRECTED, BUT IF NO INSTRUCTIONS ARE SPECIFIED,
THIS PROXY WILL BE VOTED FOR EACH OF THE NOMINEES AND THE PROPOSALS STATED. IF
ANY OTHER BUSINESS IS PRESENTED AT THE MEETING, THIS PROXY WILL BE VOTED BY
THOSE NAMED IN THIS PROXY IN THEIR BEST JUDGMENT. AT THE PRESENT TIME, THE
BOARD OF DIRECTORS KNOWS OF NO OTHER BUSINESS TO BE PRESENTED AT THE MEETING.

 THE BOARD OF DIRECTORS RECOMMENDS A VOTE "FOR" EACH OF THE LISTED PROPOSALS.


          THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

      Should the undersigned be present and elect to vote at the Meeting or at
any adjournments or postponements thereof, and after notification to the
Secretary of the Company at the Meeting of the stockholder's decision to
terminate this proxy, then the power of such attorneys or proxies shall be
deemed terminated and of no further force and effect. This proxy may also be
revoked by filing a written notice of revocation with the Secretary of the
Company or by duly executing a proxy bearing a later date.

      The undersigned acknowledges receipt from the Company, prior to the
execution of this proxy, of notice of the Meeting and a Joint Proxy
Statement/Prospectus.

Dated:                 , 1999
      -----------------
                                          Signature of Stockholder


                                          Signature of Stockholder

Please sign exactly as your name(s) appear(s) above. When signing as attorney,
executor, administrator, trustee or guardian, please give your full title. If
shares are held jointly, each holder should sign.

      PLEASE COMPLETE, DATE, SIGN AND MAIL THIS PROXY PROMPTLY IN THE
ENCLOSED POSTAGE-PAID ENVELOPE






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