FIRST MIDWEST BANCORP INC
POS AM, 1998-03-06
NATIONAL COMMERCIAL BANKS
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<PAGE>
 
                                                  Registration No. 333-37809
   As filed with the Securities and Exchange Commission on March __, 1998
============================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                         POST-EFFECTIVE AMENDMENT NO. 1

                                       TO

                                    FORM S-3

                             REGISTRATION STATEMENT
                                     Under
                           THE SECURITIES ACT OF 1933

                          FIRST MIDWEST BANCORP, INC.
             (Exact name of registrant as specified in its charter)

                Delaware                                 36-3161078
      (State or other jurisdiction                    (I.R.S. Employer
    of incorporation or organization)                Identification No.)

   300 Park Boulevard, Suite 405, Itasca, Illinois 60143-0459, (630) 875-7450
    (Address, including zip code, and telephone number, including area code,
                  of registrant's principal executive offices)

                              Donald J. Swistowicz
                            Executive Vice President
                          First Midwest Bancorp, Inc.
           300 Park Boulevard, Suite 405, Itasca, Illinois 60143-0459
                                 (630) 875-7450
           (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

                                   Copies to:

         Timothy M. Sullivan                      Gary L. Mowder
         Hinshaw & Culbertson                     Schiff Hardin & Waite
         222 North LaSalle Street, Suite 300      7200 Sears Tower
         Chicago, Illinois 60601-1081             Chicago, Illinois 60606
         (312) 704-3000                           (312) 258-5514

     The registrant hereby amends this Post-Effective Amendment No. 1 to 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 Post-Effective Amendment No. 1 to this
Registration Statement shall thereafter become effective in accordance with
Section 8(a) of the Securities Act of 1933 or until the Post-Effective Amendment
No. 1 to this Registration Statement shall become effective on such date as the
Commission, acting pursuant to said Section 8(a), may determine.
<PAGE>
 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+      Information contained herein is subject to completion or amendment.  A  +
+ registration statement relating to these securities has been filed with the  +
+ Securities and Exchange Commission.  These securities may not be sold nor    +
+ may offers to buy be accepted prior to the time the registration statement   +
+ becomes effective.  This prospectus shall not constitute an offer to sell or +
+ the solicitation of an offer to buy nor shall there be any sale of these     +
+ securities in any State in which such offer, solicitation or sale would be   +
+ unlawful prior to registration or qualification under the securities laws of +
+ any such State.                                                              +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

                Subject to Completion, dated March ______, 1998

    PROSPECTUS March ___,1998

                          FIRST MIDWEST BANCORP, INC.

                                1,520,611 Shares

                                  Common Stock
                                ($.01 par value)

         This Prospectus pertains to an offering from time to time of up to
    1,520,611 shares of common stock, par value $.01 ("Common Stock"), of First
    Midwest Bancorp, Inc. (the "Company"), held by stockholders (the "Selling
    Stockholders") who received the shares in exchange for their shares of
    common stock of SparBank, Incorporated ("SparBank"), in connection with the
    Company's acquisition of SparBank on October 1, 1997.  See "SELLING
    STOCKHOLDERS" (located on pages 9-11 of this Prospectus).  The Company will
    not receive any proceeds from the sale of the shares of Common Stock covered
    by this Prospectus.  The Company has agreed to pay certain expenses in
    connection with this offering (excluding underwriting discounts, selling
    commissions, brokers' fees or similar discounts, commissions or fees to be
    paid by the Selling Stockholders).

         The Common Stock is quoted on the Nasdaq Stock Market's National Market
    (the "Nasdaq Stock Market") under the symbol "FMBI".  On March ___, 1998,
    the last sale price of the Common Stock as reported on the Nasdaq Stock
    Market was $_______ per share.

         The Common Stock may be offered for sale from time to time by the
    Selling Stockholders to or through underwriters or directly to other
    purchasers or through agents or brokers in one or more transactions on the
    Nasdaq Stock Market, in one or more private transactions, or in a
    combination of such methods of sale, at prices and on terms then prevailing,
    at prices related to such prices, or at negotiated prices.  The price at
    which any of the shares of Common Stock may be sold, and the commissions, if
    any, paid in connection with any such sale, are unknown and may vary from
    transaction to transaction.  As of the date hereof, the distribution and
    sale of the shares of Common Stock offered hereby are also subject to the
    provisions of an Investment Agreement, dated as of June 18, 1997, between
    the Company and the Selling Stockholders.  The Investment Agreement
    requires, among other things, that any transfer of the shares "to the
    public" be made in an "ordinary trading transaction."  An "ordinary trading
    transaction" is defined in the Investment Agreement as a sale of the shares
    on the Nasdaq Stock Market using the services of a broker-dealer registered
    in the state where the transfer is to occur, without the use of special
    selling efforts or methods. See "PLAN OF DISTRIBUTION" (located on pages 11-
    12 of this Prospectus).

         See "INVESTMENT CONSIDERATIONS" (located on pages 6-9 of the
    Prospectus) for a discussion of certain risks that should be considered by
    prospective investors.

         THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
         SECURITIES AND EXCHANGE COMMISSION OR ANY STATE
<PAGE>
 
         SECURITIES COMMISSION NOR HAS THE SECURITIES AND EXCHANGE COMMISSION OR
         ANY STATE SECURITIES COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF
         THIS PROSPECTUS.  ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL
         OFFENSE.

         THESE SECURITIES ARE NOT SAVINGS  ACCOUNTS OR DEPOSITS AND ARE NOT
         INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION.

                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
 
    <S>                                                            <C>
    The Company..................................................   3
    Recent Developments..........................................   3
    Cautionary Statement Concerning Forward-Looking Information..   6
    Investment Considerations....................................   6
    Use of Proceeds..............................................   9
    Selling Stockholders.........................................   9
    Plan of Distribution.........................................  11
    Pro Forma Financial Information..............................  12
    Legal Matters................................................  16
    Experts......................................................  16
    Available Information........................................  16
    Incorporation of Certain Documents by Reference..............  17
</TABLE>

         No dealer, salesperson or other person has been authorized to give any
    information or to make any representations not contained or incorporated by
    reference in this Prospectus, and, if given or made, such information or
    representations must not be relied upon as having been authorized by the
    Company.  This Prospectus does not constitute an offer to sell or
    solicitation of an offer to buy to any person in any jurisdiction where such
    an offer or solicitation would be unlawful.  Neither the delivery of this
    Prospectus nor any sale made hereunder shall, under any circumstances,
    create an implication that the information contained herein is current as of
    any time subsequent to the date hereof.

                                       2
<PAGE>
 
                                  THE COMPANY

         The Company is a Delaware corporation that was incorporated in 1982 for
    the purpose of becoming a multi-bank holding company.  The subsidiaries
    ("Affiliates") of the Company include a commercial bank that is a national
    banking association and three nonbank Affiliates that offer trust and
    investment management, mortgage banking and credit life insurance related
    services in the same markets served by the bank Affiliate.  See also "RECENT
    DEVELOPMENTS" below (located on pages 3-5 of this Prospectus). The Company,
    headquartered in the Chicago suburb of Itasca, Illinois, is Illinois' third
    largest publicly traded bank holding company with assets of approximately
    $3.6 billion at December 31, 1997.

         The Bank's national bank affiliate, First Midwest Bank, National
    Association (the "Bank"), is engaged in the general commercial banking
    business which embraces all the usual functions of commercial and retail
    banking, including: accepting deposits; commercial and industrial, consumer
    and real estate lending; collections; safe deposit box operations; and other
    banking services tailored for individual, commercial and industrial and
    governmental customers.  The Bank operates 55 banking offices in northern
    Illinois with approximately 78% of its banking assets located in the
    suburban metropolitan Chicago area.  Another approximate 16% of the Bank's
    assets are located in the "Quad-Cities" area of Western Illinois which
    includes the Illinois cities of Moline and Rock Island and the Iowa cities
    of Davenport and Bettendorf.  The remaining 6% of the Bank's assets are
    located in the southeastern region of the state in Vermilion and Champaign
    counties.  In each of the primary markets in which the Bank operates, it
    ranks among the top five banking institutions in market share of deposits.

         First Midwest Trust Company, N.A. (the "Trust Company"), provides trust
    and investment management services to its clients, acting as executor,
    administrator, trustee, agent, and in various other fiduciary capacities.
    As of December 31, 1997, the Trust Company had approximately $1.6 billion in
    trust assets under management, comprised of accounts ranging from small
    personal investment portfolios to large corporate employee benefit plans.

         First Midwest Mortgage Corporation (the "Mortgage Corporation")
    performs centralized residential real estate mortgage loan origination,
    sales and servicing operations previously conducted by the Bank.

         First Midwest Insurance Company operates as a reinsurer of credit life,
    accident and health insurance sold through the Bank, primarily in
    conjunction with its consumer lending operations.

         The Company's principal executive office is located at 300 Park
    Boulevard, Suite 405, Itasca, Illinois, 60143-3459, and its telephone number
    is (630) 875-7450.

                              RECENT DEVELOPMENTS

         Acquisition of SparBank.  The Company consummated the acquisition of
    SparBank, the holding company of McHenry State Bank ("MSB"), which was
    headquartered in McHenry, Illinois, on October 1, 1997.  MSB operated four
    banking offices in McHenry County, Illinois, and had total

                                       3
<PAGE>
 
    assets of approximately $436 million as of December 31, 1997.  The Company
    merged MSB into the Bank on February 23, 1998.

         The acquisition was accounted for as a pooling of interests.  The
    Selling Stockholders received 21.7234 shares of Common Stock for each share
    of SparBank common stock they owned in a tax-free exchange.  The Company
    issued 3,230,764 shares of Common Stock to the Selling Stockholders in
    exchange for all of the issued and outstanding common stock of SparBank.

         Incident to the SparBank acquisition, the Company recorded in the
    fourth quarter of 1997 an acquisition charge of $5.446 million representing
    primarily investment banker fees, severance and related benefit costs, legal
    fees and professional services, contract termination fees and certain other
    nonrecurring merger-related costs.  Additionally, also incident to the
    acquisition, the Company recorded a one-time provision of $1.296 million to
    conform MSB's loan loss reserves and credit policies to First Midwest's.

         Pending Acquisition.  On January 14, 1998, the Company, First Midwest
    Acquisition Corporation, a wholly owned subsidiary of the Company
    ("Acquisition Corporation"), and Heritage Financial Services, Inc.
    ("Heritage"), entered into an Agreement and Plan of Merger (the "Merger
    Agreement") whereby Heritage will be merged with and into Acquisition
    Corporation (the "Merger"). Heritage is a $1.3 billion holding company
    headquartered in Tinley Park, Illinois with 17 banking offices located in
    the south and southwest suburban Chicago banking market.

         Pursuant to the Merger Agreement, the transaction will be structured as
    a tax-free exchange and accounted for as a pooling-of-interests.  Each
    outstanding share of Heritage's Common stock, no par value, will be
    converted to 0.7695 of a share of Company Common Stock, resulting in the
    issuance of approximately 9.7 million shares of Company Common Stock.  Based
    on First Midwest's January 14, 1998 closing price of $42.38 per share, the
    transaction is valued at approximately $411 million.

         The Merger is conditioned upon, among other things, approval by the
    shareholders of both First Midwest and Heritage, and receipt of customary
    regulatory approvals.  The Merger Agreement has been approved by the Boards
    of Directors of both companies.  In conjunction with the approval of the
    Merger Agreement, Heritage rescinded the balance of its stock repurchase
    program authorized in June, 1996.  It is anticipated the acquisition will be
    consummated late in the second quarter of 1998.  First Midwest intends to
    merge Heritage Bank, Heritage's principal subsidiary, into the Bank prior to
    year-end 1998.

         Incident to the entry into the Merger Agreement, the Company and
    Heritage executed a Stock Option Agreement (the "Option Agreement") pursuant
    to which Heritage granted the Company an option to acquire up to 2,400,000
    shares of Heritage Common Stock (representing 19.9% of its outstanding
    shares as of January 14, 1998) at a price of $21.25 per share subject to
    certain terms and conditions set forth in the Option Agreement.

                                       4
<PAGE>
 
         On January 23, 1998, the Company filed a Current Report on Form 8-K
    with the Commission (the "Company Form 8-K"), which contains, among other
    things, certain financial and other information (the "Company Form 8-K
    Materials") about the Merger. The Company Form 8-K Materials contain certain
    forward-looking statements regarding the Company, Heritage and the combined
    organization following the Merger, including statements relating to
    estimated cost savings and enhanced revenues that may be realized from the
    Merger, and certain acquisition costs and charges expected to be incurred in
    connection with the Merger. Such forward-looking statements involve
    significant risks and uncertainties. Actual results may differ materially
    from the results discussed in the Company Form 8-K Materials and herein.
    Factors that might cause such a difference include, but are not limited to,
    those discussed in the Company Form 8-K and the Company's Annual Report on
    Form 10-K for the year ended December 31, 1997. See "AVAILABLE INFORMATION,"
    "INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE" and "CAUTIONARY STATEMENT
    CONCERNING FORWARD-LOOKING INFORMATION" (located on pages 16, 17 and 6,
    respectively, of this Prospectus).

         As indicated in the Company Form 8-K:

              .    The Company expects to realize before-tax expense savings
                   resulting from the Merger of approximately $3.8 million and
                   $9.6 million in 1998 and 1999, respectively, or approximately
                   $2.3 million and $5.8 million after-tax, respectively. These
                   estimates assume that approximately 30% of Heritage's 1997
                   annualized expenses are eliminated by the end of 1999.

              .    The Company expects to record pre-tax acquisition costs and
                   related charges currently estimated at $15.4 million upon the
                   consummation of the Merger, as summarized below:

<TABLE>
<CAPTION> 
<S>                                                       <C>
                   Severance and Related Obligations....  $ 8.0
                   Investment Banker Fees and Expenses..    4.7
                   Professional and Filing Fees.........    1.2
                   Contract Termination Fees............    0.8
                   Other................................    0.7
                                                          -----
 
                   Total................................  $15.4
                                                          =====
</TABLE>

    The estimates include assumptions about the timing of the consummation of
    the Merger and the number of employees whose employment will terminate as a
    result of the Merger.  Changes in such assumptions could result in a change
    in the estimated total charge.

                                       5
<PAGE>
 
                        CAUTIONARY STATEMENT CONCERNING
                          FORWARD-LOOKING INFORMATION

         This Prospectus (including information included or incorporated by
    reference herein) contains certain forward-looking statements with respect
    to the financial condition, results of operations, plans, objectives, future
    performance and business of each of the Company and Heritage, including (i)
    statements relating to the cost savings estimated to result from the Merger,
    (ii) statements relating to revenues estimated to result from the Merger,
    (iii) statements relating to the restructuring charges estimated to be
    incurred in connection with the Merger and (iv) statements preceded by,
    followed by or that include the words "believes," "expects," "anticipates,"
    "estimates" or similar expressions.  See "RECENT DEVELOPMENTS" and "PRO
    FORMA FINANCIAL INFORMATION" (located on pages 3-5 and 12-15, respectively,
    of this Prospectus).  These forward-looking statements involve certain risks
    and uncertainties.  The Company does not undertake any obligation to reflect
    circumstances or events that arise after the date hereof.  Factors that may
    cause actual results to differ materially from those contemplated by such
    forward-looking statements include, among others, the following
    possibilities: (a) expected cost savings from the Merger may not be fully
    realized or realized within the expected time frame; (b) revenues following
    the Merger may be lower than expected, or deposit attrition, operating costs
    or customer loss and business disruption following the Merger may be greater
    than expected; (c) competitive pressures among depository and other
    financial institutions may increase significantly; (d) costs or difficulties
    related to the integration of the business of the Company and Heritage may
    be greater than expected; (e) changes in the interest rate environment may
    reduce margins; (f) general economic or business conditions, either
    nationally or in the states in which the Company is doing business, may be
    less favorable than expected, resulting in, among other things, a
    deterioration in credit quality or a reduced demand for credit; (g)
    legislative or regulatory changes may adversely affect the business in which
    the Company is engaged; and (h) changes may occur in the securities markets.
    The forward-looking earnings estimates included in this Prospectus have not
    been examined or compiled by the independent public accountants of the
    Company nor have such accountants applied any procedures thereto.
    Accordingly, such accountants do not express an opinion or any other form of
    assurance on them.  Further information on other factors which could affect
    the financial results of the Company after the Merger is included in the
    Commission filings incorporated by reference herein.

                           INVESTMENT CONSIDERATIONS

         Prospective purchasers should consider carefully the following factors
    associated with the ownership of the Common Stock together with the other
    information contained in this Prospectus.

         Competition.  Illinois, and more specifically the metropolitan Chicago
    area, is a highly competitive market for banking and related financial
    services.  Since the Chicago area is the Company's focus market, the Bank
    and the Mortgage Corporation are exposed to varying types and levels of
    competition from associated industries.  In general, however, the Bank and
    the Mortgage Corporation compete with other banking institutions, savings
    and loan associations, personal loan and finance companies, and credit
    unions within their market areas.  The Trust Company competes 

                                       6
<PAGE>
 
    with retail and discount stock brokers, investment advisors, mutual funds,
    insurance companies, and to a lesser extent, financial institutions. Factors
    influencing the type of competition experienced by the Trust Company
    generally involve the variety of products and services that can be offered
    to clients. Satisfying the needs of the client, in terms of providing
    quality services and tailored products at competitive prices, primarily
    dictates the competitive advantage within the industries.

         Loan Portfolio Risks.  Inherent in the Company's banking operations are
    risks associated with the loan portfolio, including credit, interest rate,
    prepayment and liquidity risk.  The Company manages such risks through
    adherence to policies and procedures designed to control and/or limit risk,
    such as underwriting and asset/liability policies and procedures as well as
    a detailed loan rating system used in conjunction with credit reviews
    performed by its loan review staff. Further, loan loss reserve policies
    provide Management with recommended levels of loan reserves, mitigating the
    financial statement impact of unforeseen future losses on loans.  Management
    does not believe that the overall loan portfolio risk inherent in the
    Company's loan portfolio is in excess of risks experienced by others in the
    same or similar industries.

         Impact of Interest Rate Changes.  Interest rate risk is an inherent
    part of the banking business as financial intermediaries garner deposits and
    borrow other funds to finance earning assets. Risk results when either
    contractual relationships or prevailing market conditions cause rates paid
    on deposits and other borrowings to reprice on a basis which does not
    coincide with the repricing events affecting yields on earning assets.  If
    more assets than liabilities reprice in a given time period, the balance
    sheet is considered asset-sensitive.  In a rising interest rate environment,
    this position would generally result in favorable growth in net interest
    income, and in a declining interest rate environment, net interest income
    would be adversely affected.  Conversely, if more liabilities than assets
    reprice, the balance sheet is considered liability-sensitive.  In a rising
    rate environment, this position would generally result in an adverse effect
    on net interest income, and in a declining interest rate environment the
    effect would be favorable.

         Economic Conditions and Monetary Policies.  Conditions beyond
    Management's control may have a significant impact on changes in net
    interest income from one period to another. Examples of such conditions
    could include: (a) the strength of credit demands by customers; (b) fiscal
    and debt management policies of the federal government, including changes in
    tax laws; (c) the Federal Reserve Board's monetary policy, including the
    percentage of deposits that must be held in the form of non-performing cash
    reserves; (d) the introduction and growth of new investment instruments and
    transaction accounts by non-bank financial competitors; and (e) changes in
    rules and regulations governing payment of interest on deposit accounts.

         Government Regulation.  The Company and its Affiliates are subject to
    regulation and supervision by various governmental regulatory authorities
    including, but not limited to, the Federal Reserve Board, the Office of the
    Comptroller of the Currency, the Federal Deposit Insurance Corporation (the
    "FDIC"), the Illinois Commissioner of Banks and Real Estate, the Arizona
    Department of Insurance, the Internal Revenue Service and state taxing
    authorities.  Financial institutions and their holding companies are
    extensively regulated under federal and state law.

                                       7
<PAGE>
 
         Federal and state laws and regulations generally applicable to
    financial institutions, such as the Company and the Affiliates, regulate,
    among other things, the scope of business, investments, reserves against
    deposits, capital levels relative to operations, the nature and amount of
    collateral for loans, the establishment of branches, mergers, consolidations
    and dividends. This supervision and regulation is intended primarily for the
    protection of the FDIC's bank and savings association insurance funds and
    depositors of a financial institution. Consequently, laws and regulations
    may impose limitations on the Company that may not be in the best interests
    of the Company and its stockholders. The effect of such statutes,
    regulations and policies can be significant, and cannot be predicted with a
    high degree of certainty.

         FDIC Insurance Premiums.  The deposits of the Company are insured up to
    $100,000 per insured member (as defined by law and regulation) by the FDIC
    with such insurance backed by the full faith and credit of the United States
    government.  The Company's deposits are predominantly insured by the Bank
    Insurance Fund ("BIF") while certain deposits of the Company are insured by
    the Savings Association Insurance Fund ("SAIF"), both of which are
    administered by the FDIC.

         As insurer, the FDIC assesses deposit insurance premiums and is
    authorized to conduct examinations of, and require reporting by, FDIC-
    insured institutions.  Deposit insurance premiums are assessed through a
    risk-based system under which all insured depository institutions are placed
    into one of nine categories and assessed insurance premiums based upon their
    level of capital and supervisory evaluation.  Institutions assigned higher
    risk classifications pay deposit insurance premiums at a higher rate than
    the institutions assigned lower risk classifications.

         The 1998 annual deposit insurance premium established by the FDIC for
    the Company's BIF assessable deposits is set at 0%, reflecting the lowest
    premium assessment as the Company is classified as well-capitalized.
    Further, as a result of the special assessment on SAIF deposits required by
    the Deposit Insurance Funds Act of 1996, the SAIF was recapitalized on
    October 1, 1996. Accordingly, no premium assessments have been imposed on
    the Company's SAIF deposits for 1998. It is unknown whether such assessments
    will change in future periods.

         For 1998, the Company will pay premium assessments on both its BIF and
    SAIF deposits in order to service the interest on the Financing Corporation
    ("FICO") bond obligations which were used to finance the cost of "thrift
    bailouts" in the 1980's.  The FICO assessment rates on BIF assessable
    deposits were set at $.01296 and $.0126 per $100 of insured deposits for the
    1998 first and second semi-annual periods, respectively, and $.0648 and
    $.0630 per $100 of insured for SAIF assessable deposits, respectively, for
    such periods.  These rates may be adjusted quarterly to reflect changes in
    the assessment basis for the BIF and SAIF.  By law, the FICO rate on BIF
    assessable deposits must be 1/5 of the rate on SAIF assessable deposits
    until the insurance funds are merged or until January 1, 2000, whichever
    occurs first.

         Anti-Takeover Provisions.  The Company has taken a number of actions
    which could have the effect of discouraging a takeover attempt that might be
    beneficial to stockholders who wish to receive a premium for their shares
    from a potential bidder.  The Company has adopted a stockholder rights plan
    which would cause substantial dilution to a person who attempts to acquire
    the Company 

                                       8
<PAGE>
 
    on terms not approved by the Company's Board of Directors. The stockholder
    rights plan may therefore have the effect of delaying or preventing any
    change in control and deterring any prospective acquisition of the Company.
    The Company's Restated Certificate of Incorporation and its Amended and
    Restated By-laws also contain provisions which may have the effect of
    delaying or preventing a change in control. The provisions include: (i) the
    classification of the Board of Directors; (ii) the restriction that
    directors can only be removed for cause and only by a majority of the
    directors or by the vote of persons holding 67% of the voting securities of
    the Company; (iii) the authority of the Board of Directors to issue series
    of preferred stock with such voting rights and other provisions as the Board
    of Directors may determine; (iv) a super-majority voting requirement to
    approve certain business combinations; and (v) a super-majority voting
    requirement to amend provisions of the Restated Certificate of Incorporation
    or the Amended and Restated By-laws relating to the classification of the
    Board, removal of directors and the super-majority voting requirement for
    certain business combinations. In addition, Section 203 of the Delaware
    General Corporation Law may have the effect of discouraging takeover
    attempts directed at the Company. Furthermore, employment agreements with
    certain senior executives of the Company provide for severance pay in the
    event of a "Change of Control" of the Company as such term is defined in
    such agreements.

         Acquisition Charge.  See "RECENT DEVELOPMENTS -- Pending Acquisition"
    (located on pages 4-5 of this Prospectus) for a description of the pre-tax
    acquisition costs and related charges to be recorded in the second quarter
    of 1998 incident to the acquisition of Heritage.

                                USE OF PROCEEDS

         All of the shares of Common Stock covered hereby are being offered by
    the Selling Stockholders. The Company will not receive any proceeds from the
    sales of Common Stock by the Selling Stockholders.

                              SELLING STOCKHOLDERS

         On June 18, 1997, the Company, FMB Acquisition Corporation, a Delaware
    corporation and wholly owned subsidiary of the Company ("FMB"), and SparBank
    and certain of the Selling Stockholders entered into an Agreement and Plan
    of Merger (the "Merger Agreement") pursuant to which SparBank was merged
    with and into FMB on October 1, 1997 (the "Merger").  Upon the consummation
    of the Merger, each outstanding share of common stock of SparBank was
    converted into 21.7234 shares of Common Stock of the Company.  A total of
    3,230,764 shares of Common Stock were issued to the Selling Stockholders in
    exchange for all of the issued and outstanding shares of SparBank common
    stock.

         The Selling Stockholders and the Company are parties to the Investment
    Agreement pursuant to which the Company agreed to prepare and file with the
    Securities and Exchange Commission (the "Commission") a Registration
    Statement under the Securities Act of 1933, as amended (the "Securities
    Act"), registering the offer and sale by the Selling Stockholders of an
    agreed-upon number of the shares of Common Stock issued in the Merger.  The
    Company has agreed to prepare 

                                       9
<PAGE>
 
    and file with the Commission such amendments and supplements to the
    Registration Statement and the Prospectus as may be necessary to keep the
    Registration Statement effective until the earlier of October 1, 1998, or
    the date on which all of the shares of Common Stock offered hereby have been
    sold. Under the terms of the Investment Agreement, the Company has agreed to
    pay certain fees and expenses incurred in connection with the registration;
    provided, however, that the Company will not pay any underwriting discounts,
    selling commissions, brokers' fees or similar discounts, commissions or fees
    attributable to the sale or distribution of the shares of Common Stock,
    which expenses will be paid by the Selling Stockholders.

         Under the Investment Agreement, the Selling Stockholders agreed that
    they would not directly or indirectly offer, sell, pledge or transfer or
    otherwise dispose of (or solicit any offers to buy, purchase, or otherwise
    acquire or pledge) any of the shares offered hereby, except in compliance
    with the Investment Agreement and the Securities Act and the rules and
    regulations promulgated thereunder.

         The Selling Stockholders may not transfer their rights under the
    Investment Agreement without the Company's consent.  Such consent is not
    required, however, in the case of a transfer by bequest, devise,
    inheritancy, laws of intestacy, or gift.

         The table below sets forth certain information with respect to the
    Selling Stockholders and their beneficial ownership of Common Stock as of
    March ___, 1998, and includes information with respect to positions, offices
    or other material relationships of the Selling Stockholders with the
    Company, or any of its predecessors or affiliates, during the past three
    years. Each of the Selling Stockholders will determine, in such Selling
    Stockholder's sole discretion, the number of shares of Common Stock, if any,
    to be sold by such Selling Stockholder during the effectiveness of the
    Registration Statement, but in no event will such number exceed the number
    of shares of Common Stock specified below.  The Company may amend or
    supplement this Prospectus from time to time to disclose the names,
    relationships to the Company, and holdings of Common Stock of additional
    Selling Stockholders.

<TABLE>
<CAPTION>
                                                                    Number of Shares      Percentage of
                                   Shares of                        of Common Stock       Common Stock
                                  Common Stock   Number of Shares    Owned Assuming      Owned Assuming
                                 Owned Prior to  of Common Stock   the Sale of All of  the Sale of All of
    Name/1/                       the Offering       Offered       the Shares Offered  the Shares Offered
    -------                      --------------  ----------------  ------------------  -------------------
    <S>                          <C>             <C>               <C>                 <C>
 
    Geraldine C. Cowlin/2/.....     2,310,153          600,000          1,710,153              8.53%
    William J. Cowlin, Sr./3/..         8,689            8,689                  0              0.00
    William J. Cowlin, Jr./4/..       114,286          114,286                  0              0.00
    Sarah Cowlin Towne/4/......       114,286          114,286                  0              0.00
    Bridget Cowlin.............       114,286          114,286                  0              0.00
    Martha Cowlin..............       114,286          114,286                  0              0.00
    David Cowlin...............       114,330          114,330                  0              0.00
    John Zieman................       170,224          170,224                  0              0.00
    Jane Zieman Salmon.........       170,224          170,224                  0              0.00
                                    ---------        ---------
         Total.................     3,230,764        1,520,611
                                    =========        ---------
</TABLE>
    ------------------

                                       10
<PAGE>
 
    1  William J. Cowlin, Sr., is the spouse of Geraldine C. Cowlin.  William J.
       Cowlin, Jr., Sarah Cowlin Towne, Bridget Cowlin, Martha Cowlin and David
       Cowlin are the children of William J. Cowlin, Sr., and Geraldine Cowlin.
       John Zieman and Jane Zieman Salmon are the nephew and niece of William J.
       Cowlin, Sr., and Geraldine C. Cowlin.

    2  Geraldine C. Cowlin served as President and a Director of SparBank and as
       a Director of MSB prior to the Merger.

    3  William J. Cowlin, Sr., served as Secretary and a Director of SparBank 
       and as a Director of MSB prior to the Merger. As provided in the Merger
       Agreement, William J. Cowlin, Sr., was appointed to serve as a Director
       of the Company effective as of October 1, 1997, for a three-year term.
       Under the terms of the Merger Agreement, William J. Cowlin, Sr. (or such
       other nominee of Geraldine C. Cowlin) shall be nominated by the Board of
       Directors of the Company to serve as director of the Company for a second
       three-year term following the expiration of his first term.

    4  William J. Cowlin, Jr., and Sarah Cowlin Towne served as directors of MSB
       prior to the Merger.


                              PLAN OF DISTRIBUTION

         Subject to applicable provisions of the Investment Agreement, the
    Common Stock covered by this Prospectus may be offered for sale from time to
    time by the Selling Stockholders to or through underwriters or directly to
    other purchasers or through agents in one or more transactions on the Nasdaq
    National Market, in one or more private transactions, or in a combination of
    such methods of sale, at prices and on terms then prevailing, at prices
    related to such prices, or at negotiated prices. Such methods of sale may
    include, without limitation, (a) a block trade in which the broker-dealer so
    engaged will attempt to sell the Common Stock as agent but may position and
    resell a portion of the block as principal to facilitate the transaction,
    (b) purchases by a broker-dealer as a principal and resale by such broker-
    dealer for its own account pursuant to this Prospectus, and (c) ordinary
    brokerage transactions and transactions in which the broker solicits
    purchasers. This Prospectus may be amended and supplemented from time to
    time to describe a specific plan of distribution, to the extent that such
    amendment or supplement is required by applicable law.

         In connection with sales of the Common Stock or otherwise, the Selling
    Stockholders may enter into hedging transactions with broker-dealers or
    other financial institutions.  In connection with such transactions, broker-
    dealers or other financial institutions may engage in short sales of Common
    Stock in the course of hedging the positions they assume with the Selling
    Stockholders. To the extent permitted by applicable law, the Selling
    Stockholders may also sell Common Stock short and redeliver the shares to
    close out such short positions. The Selling Stockholders may also enter into
    options or other transactions with broker-dealers or other financial
    institutions which require the delivery to such broker- dealer or financial
    institution of the Common Stock offered hereby, which Common Stock such
    broker-dealer or other financial institution may resell pursuant to this
    Prospectus (as supplemented or amended to reflect such transaction). The
    Selling Stockholders may also pledge the shares registered hereunder to a
    broker-dealer or other financial institution and, upon a default, such
    broker-dealer or other financial institution may, subject to the Investment
    Agreement, effect sales of the pledged Common Stock pursuant to this
    Prospectus.

         Brokers, dealers or agents may receive compensation in the form of
    commissions, discounts or concessions from the Selling Stockholders in
    amounts to be negotiated in connection with sales 

                                       11
<PAGE>
 
    pursuant hereto. Any such remuneration will be disclosed in a prospectus or
    prospectus supplement filed under the Securities Act, to the extent such
    disclosure is required under applicable law. The Selling Stockholders and
    such brokers and dealers and any other participating brokers or dealers may
    be deemed to be "underwriters" within the meaning of the Securities Act, in
    connection with such sales, and any such commission, discount or concession
    may be deemed to be underwriting discounts or commissions under the
    Securities Act.

         In order to comply with the securities laws of certain states, if
    applicable, the Common Stock will be sold hereunder in such jurisdictions
    only through registered or licensed brokers or dealers.

         Notwithstanding the foregoing, as of the date of this Prospectus, the
    distribution and sale of the shares of Common Stock offered hereby are
    subject to the provisions of the Investment Agreement. The Investment
    Agreement requires, among other things, that any transfer of such shares of
    Common Stock "to the public" be made in an "ordinary trading transaction."
    An "ordinary trading transaction" is defined in the Investment Agreement as
    a sale of the shares on the Nasdaq National Market using the services of a
    broker-dealer registered in the state where the transfer is to occur,
    without the use of special selling efforts or methods.

         Under the Investment Agreement, the Company has agreed to indemnify the
    Selling Stockholders and certain related persons against certain liabilities
    in connection with the offering of the Common Stock pursuant to this
    Prospectus, including liabilities arising under the Securities Act. The
    Selling Stockholders have also agreed to indemnify the Company and certain
    related persons against certain liabilities in connection with the offering
    of the Common Stock pursuant to this Prospectus, including liabilities
    arising under the Securities Act.

                        PRO FORMA FINANCIAL INFORMATION
                 (dollars in thousands, except per share data)

         The following unaudited Pro Forma Condensed Statement of Condition as
    of December 31, 1997, combines, under the pooling-of-interests method of
    accounting, the historical consolidated statements of condition of the
    Company and Heritage as if the Merger had been effective on December 31,
    1997.  The following unaudited Pro Forma Condensed Statements of Income for
    the years ended December 31, 1997, December 31, 1996 and December 31, 1995
    present the combined results of operations of the Company and Heritage,
    under the pooling-of-interests method of accounting, as if the Merger had
    been effective at January 1, 1995.

         The pro forma combined information is not necessarily indicative of the
    actual results that would have occurred had the Merger been consummated
    prior to the periods indicated, or of the future operations of the combined
    entity.  This information should be read in conjunction with, and is
    qualified in its entirety by, the historical financial statements of the
    Company, including the notes thereto.  See "AVAILABLE INFORMATION,"
    "INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE," "CAUTIONARY STATEMENT
    CONCERNING FORWARD-LOOKING INFORMATION," and "RECENT DEVELOPMENTS" (located
    on pages 16, 17, 6 and 3-5, respectively, of this Prospectus).

                                       12
<PAGE>

         Under the pooling-of-interests method of accounting, the historical
    basis of the assets and liabilities of the Company and Heritage will be
    combined as of the consummation of the Merger and carried forward at their
    previously recorded amounts.  The stockholders' equity accounts of the
    Company and Heritage will be combined on the Company's consolidated
    statement of condition, and no goodwill or other intangible assets will be
    created.  Financial statements of the Company issued after the Merger will
    be restated retroactively to reflect the consolidated operations of the
    Company and Heritage as if the Merger had taken place prior to the periods
    covered by such financial statements.

         The Company and Heritage expect that the combined company will achieve
    substantial benefits from the Merger in the form of operating cost savings.
    However, the unaudited pro forma financial information does not reflect any
    direct costs or potential savings which are expected to result from the
    consolidation of operations of the Company and Heritage, and, therefore,
    does not purport to be indicative of the results of future operations.

         The pro forma financial statements do not take into account the effect
    of the special charge for acquisition costs and related expenses and the
    effect of such charge on the financial condition, results of operations and
    reported per share amounts of the combined company.

<TABLE>
<CAPTION>
                                                           Pro Forma Condensed Statement of Condition (Unaudited)
                                                                             December 31, 1997
                                                           ------------------------------------------------------
                                                                     Historical
                                                           --------------------------------
                                                                                                       Pro Forma
Assets                                                     First Midwest          Heritage           Consolidated
                                                           -------------         ----------          ------------
<S>                                                        <C>                   <C>                 <C>
Cash and due from banks..................................     $  117,974         $   48,214           $  166,188
Funds sold and other short-term investments..............         31,055              2,864               33,919
Mortgages held for sale..................................         26,857                 --               26,857
Securities available for sale............................        974,467            407,087            1,381,554
Securities held to maturity..............................         20,323            113,101              133,424
Trading account securities...............................            ---                450                  450
Loans....................................................      2,333,252            711,541            3,044,793
Reserve for loan losses..................................        (37,344)            (9,621)             (46,965)
                                                              ----------         ----------           ----------
    Net Loans............................................     $2,295,908         $  701,920           $2,997,828
                                                              ----------         ----------           ----------

Premises, furniture and equipment........................         59,219             19,585               78,804
Accrued interest receivable and other assets.............         88,370             26,100              114,470
                                                              ----------         ----------           ----------
    Total Assets.........................................     $3,614,173         $1,319,321           $4,933,494
                                                              ==========         ==========           ==========

Liabilities and Stockholders' Equity
Deposits.................................................     $2,795,975         $1,139,631           $3,935,606
Short-term borrowings....................................        438,032             45,569              483,601
Accrued interest payable and other liabilities...........         42,654             11,915               54,569
                                                              ----------         ----------           ----------
    Total liabilities....................................      3,276,661          1,197,115            4,473,776
                                                              ----------         ----------           ----------
Stockholders' equity.....................................        337,512            122,206              459,718
                                                              ----------         ----------           ----------
    Total Liabilities and Stockholders' Equity...........     $3,614,173         $1,319,321           $4,933,494
                                                              ==========         ==========           ==========
</TABLE>
<TABLE>
<CAPTION>
                                                            Pro Forma Condensed Statement of Income (Unaudited)
                                                                            December 31, 1997
                                                           ------------------------------------------------------
                                                                     Historical
                                                           --------------------------------           
                                                                                                      Pro-Forma
                                                           First Midwest          Heritage           Consolidated
Interest Income                                            -------------         ----------          ------------
<S>                                                        <C>                   <C>                 <C> 
Interest and fees on loans...............................     $  209,003         $   57,772              266,775
Interest on securities...................................         59,005             32,960               91,965
</TABLE>

                                       13
<PAGE>

<TABLE>
<S>                                                        <C>                   <C>                 <C>
Interest on funds sold and other short-term
    investments..........................................          2,498                424                2,922
                                                              ----------         ----------           ----------
    Total interest income................................        270,506             91,156              361,662
                                                              ----------         ----------           ----------

Interest Expense
Interest on deposits.....................................         99,973             40,692              140,665
Interest on short-term borrowings........................         25,809              2,044               27,853
                                                              ----------         ----------           ----------
    Total interest expense...............................        125,782             42,736              168,518
                                                              ----------         ----------           ----------
    Net interest income..................................        144,724             48,420              193,144

Provision for Loan Losses................................          8,765                600                9,365
                                                              ----------         ----------           ----------
    Net interest income after provision
     for loan losses.....................................        135,959             47,820              183,779
                                                              ----------         ----------           ----------

Noninterest Income.......................................         37,222              9,607               46,829
Noninterest Expense......................................        113,810             31,765              145,575
                                                              ----------         ----------           ----------

    Income before income tax expense.....................         59,371             25,662               85,033
Income Tax Expense.......................................         20,556              7,869               28,425
                                                              ----------         ----------           ----------

    Net Income...........................................     $   38,815         $   17,793           $   56,608
                                                              ==========         ==========           ==========
    Net Income Per Share/(1)/............................     $     1.94                              $     1.93
                                                              ==========                              ==========
    Net Income Per Share, assuming dilution/(2)/.........     $     1.92                              $     1.90
                                                              ==========                              ==========
    Average Shares Outstanding/(1)/......................         19,986                                  29,620
                                                              ==========                              ==========
    Average Shares Outstanding, assuming
     dilution/(2)/.......................................         20,238                                  29,828
                                                              ==========                              ==========
</TABLE>
<TABLE>
<CAPTION>
                                                            Pro Forma Condensed Statement of Income (Unaudited)
                                                                            December 31, 1996
                                                           ------------------------------------------------------
                                                                     Historical
                                                           --------------------------------

                                                                                                      Pro Forma
                                                           First Midwest          Heritage           Consolidated
Interest Income                                            -------------         ----------          ------------
<S>                                                        <C>                   <C>                 <C>
Interest and fees on loans...............................     $  202,953         $   52,907              255,860
Interest on securities...................................         62,397             30,223               92,620
Interest on funds sold and other short-term
    investments..........................................          3,443                694                4,137
                                                              ----------         ----------           ----------
    Total interest income................................        268,793             83,824              352,617
                                                              ----------         ----------           ----------

Interest Expense
Interest on deposits.....................................        100,142             36,327              136,469
Interest on short-term borrowings........................         30,226              2,279               32,505
                                                              ----------         ----------           ----------
    Total interest expense...............................        130,368             38,606              168,974
                                                              ----------         ----------           ----------
    Net interest income..................................        138,425             45,218              183,643

Provision for Loan Losses................................          7,790                400                8,190
                                                              ----------         ----------           ----------
    Net interest income after provision
     for loan losses.....................................        130,635             44,818              175,453
                                                              ----------         ----------           ----------

Noninterest Income.......................................         34,335              7,724               42,059
Noninterest Expense......................................        104,767             30,801              135,568
                                                              ----------         ----------           ----------

    Income before income tax expense.....................         60,203             21,741               81,944
Income Tax Expense.......................................         20,331              6,903               27,234
                                                              ----------         ----------           ----------

    Net Income...........................................     $   39,872         $   14,838           $   54,710
                                                              ==========         ==========           ==========
    Net Income Per Share.................................     $     1.96                              $     1.86
                                                              ==========                              ==========
    Net Income Per Share, assuming dilution/(2)/.........     $     1.95                              $     1.82
                                                              ==========                              ==========
    Average Shares Outstanding/(1)/......................         20,314                                  29,470
                                                              ==========                              ==========
    Average Shares Outstanding, assuming
      dilution/(2)/......................................         20,467                                  30,076
                                                              ==========                              ==========
</TABLE>

                                       14
<PAGE>

<TABLE>
<CAPTION>
                                                            Pro Forma Condensed Statement of Income (Unaudited)
                                                                            December 31, 1995
                                                           -----------------------------------------------------
                                                                     Historical
                                                           --------------------------------
                                                                                                      Pro Forma
                                                           First Midwest          Heritage          Consolidated
Interest Income                                            -------------         ----------         ------------
<S>                                                        <C>                   <C>                <C>
Interest and fees on loans...............................     $  203,884         $   48,156           $  252,040
Interest on securities...................................         69,148             23,326               92,474
Interest on funds sold and other short-term
    investments..........................................          2,672              2,378                5,050
                                                              ----------         ----------           ----------
    Total interest income................................        275,704             73,860              349,564
                                                              ----------         ----------           ----------

Interest Expense
Interest on deposits.....................................         97,602             31,516              129,118
Interest on short-term borrowings........................         44,690              1,848               46,538
                                                              ----------         ----------           ----------
    Total interest expense...............................        142,292             33,364              175,656
                                                              ----------         ----------           ----------
    Net interest income..................................        133,412             40,496              173,908

Provision for Loan Losses................................         11,454                200               11,654
                                                              ----------         ----------           ----------
    Net interest income after provision
     for loan losses.....................................        121,958             40,296              162,254
                                                              ----------         ----------           ----------

Noninterest Income.......................................         33,695              6,971               40,666
Noninterest Expense......................................        108,083             27,670              135,753
                                                              ----------         ----------           ----------

    Income before income tax expense.....................         47,570             19,597               67,167
Income Tax Expense.......................................         16,166              6,303               22,469
                                                              ----------         ----------           ----------

    Net Income...........................................     $   31,404         $   13,294           $   44,698
                                                              ==========         ==========           ==========
    Net Income Per Share/(1)/............................     $     1.55                              $     1.52
                                                              ==========                              ==========
    Net Income Per Share, assuming dilution/(2)/.........     $     1.53                              $     1.49
                                                              ==========                              ==========
    Average Shares Outstanding/(1)/......................         20,229                                  29,391
                                                              ==========                              ==========
    Average Shares Outstanding assuming
     dilution/(2)/.......................................         20,476                                  30,067
                                                              ==========                              ==========
</TABLE>
- ------------------------------
Footnotes to Pro Forma Combining Financial Statements:

/(1)/  The pro forma combined net income per share and average shares
       outstanding is based upon the historical net income for First Midwest and
       Heritage divided by the total pro forma average shares of the combined
       entity assuming conversion of the Heritage Common Stock at the 0.7695
       Exchange Ratio (see "RECENT DEVELOPMENTS -- Pending Acquisition" located
       on pages 4-5 of this Prospectus).

/(2)/  The pro forma combined net income per share, assuming dilution, and
       average shares outstanding, assuming dilution, is based upon the
       historical net income of First Midwest and Heritage divided by the total
       pro forma average shares of the combined entity, adjusted for the
       potential dilutive effect of shares issued under the entities stock
       option plans, assuming conversion of the Heritage Common Stock at the
       0.7695 Exchange Ratio (see "RECENT DEVELOPMENTS -- Pending Acquisition"
       located on pages 4-5 of this Prospectus).

                                 LEGAL MATTERS

     The validity of the shares of Common Stock offered hereby will be passed
upon for the Company by Hinshaw & Culbertson, Chicago, Illinois.

                                       15
<PAGE>
 
                                    EXPERTS

         The consolidated financial statements of the Company at December 31,
    1997 and 1996, and for each of the two years in the period ended December
    31, 1997, included in the Company's Annual Report (Form 10-K) have been
    audited by Ernst & Young LLP, independent auditors, to the extent indicated
    in their report thereon included therein and incorporated herein by
    reference.  Such consolidated financial statements have been incorporated
    herein by reference in reliance upon such report given upon the authority of
    such firm as experts in accounting and auditing.

         The consolidated financial statements of the Company for the year ended
    December 31, 1995, have been incorporated by reference herein in reliance
    upon the report of KPMG Peat Marwick LLP, independent certified public
    accountants, which report is incorporated by reference herein upon the
    authority of said firm as experts in accounting and auditing.

         The consolidated financial statements of SparBank as of December 31,
    1996, and for each of the two years in the period then ended, have been
    incorporated in this Prospectus by reference herein in reliance upon the
    report of Grant Thornton LLP, independent certified public accountants,
    which report is incorporated by reference herein upon the authority of such
    firm as experts in accounting and auditing.

                             AVAILABLE INFORMATION

         The Company is subject to the informational reporting requirements of
    the Securities Exchange Act of 1934, as amended (the "Exchange Act"), and in
    accordance therewith files reports, proxy statements and other information
    with the Commission (File Number 0-10967).  Such reports, proxy statements
    and other information can be inspected and copied at the public reference
    facilities of the Commission, at 450 Fifth Street, N.W., Washington, D.C.
    20549 and at the Regional Offices of the Commission at the following
    locations: Seven World Trade Center, Suite 1300, New York, New York, 10048;
    and 500 West Madison Street, Suite 1400, Chicago, Illinois 60661.  Copies of
    such material can be obtained from the Public Reference Section of the
    Commission at 450 Fifth Street, N.W., Washington, D.C. 20549 at prescribed
    rates.  In addition, the Commission maintains a website (http://www.sec.gov)
    that contains certain reports, proxy statements and other information
    regarding the Company that the Company files electronically with the
    Commission. In addition, such reports, proxy statements, and other
    information concerning the Company can be inspected at the National
    Association of Securities Dealers, Inc., 1735 K Street, N.W., Washington,
    D.C. 20006.

         This Prospectus constitutes a part of a Registration Statement filed by
    the Company with the Commission under the Securities Act.  This Prospectus
    does not contain all of the information set forth in the Registration
    Statement, certain items of which are contained in exhibits to the
    Registration Statement as permitted by the rules and regulations of the
    Commission. Reference is hereby made to the Registration Statement and to
    the exhibits thereto for further information with respect to the Company.
    Any statements contained herein concerning the provisions of any contract,
    agreement or other document are not necessarily complete and, in each
    instance, reference is made to the copy of 

                                       16
<PAGE>
 
    such contract, agreement or other document filed as an exhibit to the
    Registration Statement or otherwise filed with the Commission. Each such
    statement is qualified in its entirety by such reference.

                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

         The following documents which have heretofore been filed by the Company
    with the Commission are incorporated by reference in this Prospectus:

         1.  The Company's Annual Report on Form 10-K for the fiscal year ended
             December 31, 1997;

         2.  The Company's Current Report on Form 8-K filed on January 23, 1998;
             and

         3.  The description of the Common Stock, $.01 par value, and Preferred
             Stock purchase rights associated with the Common Stock of the
             Company, no par value, as contained in the Company's Registration
             Statement on Form 8-A, dated February 17, 1989, as amended by
             subsequently filed reports on Form 8-A on November 21, 1995 and
             June 30, 1997.

         All documents filed by the Company with the Commission pursuant to
    Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act subsequent to the
    date of this Prospectus and prior to the termination of the offering made by
    this Prospectus shall be deemed to be incorporated by reference herein and
    to be a part hereof.  Any statements contained in a document incorporated or
    deemed to be incorporated by reference herein shall be deemed to be modified
    or superseded for purposes of this Prospectus to the extent that a statement
    contained herein (or in any other subsequently filed document which also is
    or is deemed to be incorporated by reference herein) modifies or supersedes
    such statement.  Any statement so modified or superseded shall not be deemed
    to constitute a part of this Prospectus, except as so modified or
    superseded.

         This Prospectus incorporates documents by reference which are not
    presented herein or delivered herewith.  Such documents (other than exhibits
    to such documents unless such exhibits are specifically incorporated by
    reference) are available to any person, including any beneficial owner, to
    whom this Prospectus is delivered, on written or oral request, without
    charge, directed to First Midwest Bancorp, Inc., at its principal executive
    offices, 300 Park Boulevard, Suite 405, Itasca, Illinois 60143-0459;
    Attention: Corporate Communications Director (630) 875-7450.

                                       17
<PAGE>
 
                PART II. INFORMATION NOT REQUIRED IN PROSPECTUS

    Item 15. Indemnification of Directors and Officers

         Under Delaware law, a corporation may indemnify any person who was or
    is a party or is threatened to be made a party to an action (other than an
    action by or in the right of the corporation) by reason of his service as a
    director or officer of the corporation, or his service, at the corporation's
    request, as a director, officer, employee or agent of another corporation or
    other enterprise, against expenses (including attorneys' fees) that are
    actually and reasonably incurred by him ("Expenses"), and judgments, fines
    and amounts paid in settlement that are actually and reasonably incurred by
    him, in connection with the defense or settlement of such action, provided
    that he acted in good faith and in a manner he reasonably believed to be in
    or not opposed to the corporation's best interests and, with respect to any
    criminal action or proceeding, had no reasonable cause to believe that his
    conduct was unlawful.  Although Delaware law permits a corporation to
    indemnify any person referred to above against Expenses in connection with
    the defense or settlement of an action by or in the right of the
    corporation, provided that he acted in good faith and in a manner he
    reasonably believed to be in or not opposed to the corporation's best
    interests, if such person has been judged liable to the corporation,
    indemnification is only permitted to the extent that the Court of Chancery
    (or the court in which the action was brought) determines that, despite the
    adjudication of liability, such person is entitled to indemnity for such
    Expenses as the court deems proper.  The determination as to whether a
    person seeking indemnification has met the required standard of conduct is
    to be made (1) by a majority vote of a quorum of disinterested members of
    the board of directors, or (2) by independent legal counsel in a written
    opinion, if such a quorum does not exist or if the disinterested directors
    so direct, or (3) by the stockholders.  The General Corporation Law of the
    State of Delaware also provides for mandatory indemnification of any
    director, officer, employee or agent against Expenses to the extent such
    person has been successful in any proceeding covered  by the statute.  In
    addition, the General Corporation Law of the State of Delaware provides the
    general authorization of advancement of a director's or officer's litigation
    expenses in lieu of requiring the authorization of such advancement by the
    board of directors in specific cases, and that indemnification and
    advancement of expenses provided by the statute shall not be deemed
    exclusive of any other rights to which those seeking indemnification or
    advancement of expenses may be entitled under any by-law, agreement or
    otherwise.

         The Company's Amended and Restated By-laws and Restated Certificate of
    Incorporation provide for indemnification of the Company's directors,
    officers, employees and other agents to the fullest extent not prohibited by
    Delaware law.

         The Company has entered into agreements to indemnify its directors and
    executive officers, in addition to the indemnification provided for in the
    Company's Amended and Restated By-Laws and Restated Certificate of
    Incorporation.  These agreements, among other things, will indemnify the
    Company's directors and executive officers for all direct and indirect
    expenses and costs (including, without limitation, all reasonable attorneys'
    fees and related disbursements, other out of pocket costs and reasonable
    compensation for time spent by such persons for which they are not otherwise
    compensated by the Company or any third party) and liabilities of any type
    whatsoever (including, but not limited to, judgments, fines and settlement
    fees) actually and reasonably incurred by such person 

                                      II-1
<PAGE>
 
    in connection with either the investigation, defense, settlement or appeal
    of any threatened, pending or completed action suit or other proceeding,
    including any action by or in the right of the Company, arising out of such
    person's services as a director, officer, employee or other agent of the
    Company, any subsidiary of the Company or any other company or enterprise to
    which the person provides services at the request of the Company. The
    Company believes that these provisions and agreements are necessary to
    attract and retain talented and experienced directors and officers.

         The Company's Restated Certificate of Incorporation is consistent with
    Section 102(b)(7) of the Delaware General Corporation Law, which generally
    permits a corporation to include a provision limiting the personal liability
    of a director in the corporation's certificate of incorporation.  With
    limitations, this provision eliminates the personal liability of the
    Company's directors to the Company or its stockholders for monetary damages
    for breach of fiduciary duty as a director. However, this provision does not
    eliminate director liability: (1) for breaches of the duty of loyalty to the
    Company and its stockholders; (2) for acts of omissions not in good faith or
    which involve intentional misconduct or a knowing violation of law; (3) for
    transactions from which a director derives improper personal benefit; or (4)
    under Section 174 of the Delaware General Corporation Law ("Section 174").
    Section 174 makes directors personally liable for unlawful dividends and
    stock repurchases or redemptions and expressly sets forth a negligence
    standard with respect to such liability.  While this provision protects the
    directors from awards for monetary damages for breaches of their duty of
    care, it does not eliminate their duty of care.  The limitations in this
    provision have no effect on claims arising under the securities laws.

         The Company maintains liability insurance for the benefit of its
    directors and officers.

    Item 16. Exhibits.

    See Exhibit Index on Page II-6.

    Item 17. Undertakings.

    (a) The undersigned registrant hereby undertakes:

         (1) To file, during any period in which offers or sales are being made,
         a post-effective amendment to this registration statement:

              (i) To include any prospectus required by section 10(a) (3) of the
         Securities Act of 1933.

              (ii) To reflect in the prospectus any facts or events arising
         after the effective date of the registration statement (or the most
         recent post-effective amendment thereof) which, individually or in the
         aggregate, represent a fundamental change in the information set forth
         in the registration statement. Notwithstanding the foregoing, any
         increase or decrease in volume of securities offered (if the total
         dollar value of securities offered would not exceed that which 

                                      II-2
<PAGE>
 
         was registered) and any deviation from the low or high end of the
         estimated maximum offering range may be reflected in the form of
         prospectus filed with the Commission pursuant to Rule 424(b) if, in the
         aggregate, the changes in volume and price represent no more than 20
         percent change in the maximum aggregate offering price set forth in the
         "Calculation of Registration Fee" table in the effective registration
         statement.

              (iii) To include any material information with respect to the
         plan of distribution not previously disclosed in the registration
         statement or any material change to such information in the
         registration statement.

    provided, however, that paragraphs (a)(l)(i) and (a)(l)(ii) do not apply if
    the registration statement is on Form S-3, Form S-8, or Form F-3, and the
    information required to be included in a post-effective amendment by those
    paragraphs is contained in periodic reports filed with or furnished to the
    Commission by the registrant pursuant to Section 13 or 15(d) of the
    Securities Exchange Act of 1934 that are incorporated by reference in the
    registration statement.

         (2) That, for the purpose of determining any liability under the
         Securities Act of 1933, each such post-effective amendment shall be
         deemed to be a new registration statement relating to the securities
         offered therein, and the offering of such securities at that time shall
         be deemed to be the initial bona fide offering thereof.

         (3) To remove from registration by means of a post-effective amendment
         any of the securities being registered which remain unsold at the
         termination of the offering.

         (b) The undersigned registrant hereby undertakes that, for purposes of
    determining any liability under the Securities Act of 1933, each filing of
    the registrant's annual report pursuant to Section 13(a) or Section 15(d) of
    the Securities Exchange Act of 1934 (and, where applicable, each filing of
    an employee benefit plan's annual report pursuant to Section 15(d) of the
    Securities Exchange Act) that is incorporated by reference in the
    registration statement shall be deemed to be a new registration statement
    relating to the securities offered therein, and the offering of such
    securities at that time shall be deemed to be the initial bona fide offering
    thereof.

         (c) Insofar as indemnification for liabilities arising under the
    Securities Act of 1933 may be permitted to directors, officers and
    controlling persons of the registrant pursuant to the provisions set forth
    or described in Item 15 of this Registration Statement, or otherwise, the
    registrant has been advised that in the opinion of the Securities and
    Exchange Commission such indemnification is against public policy as
    expressed in the Act and is, therefore, unenforceable.  In the event that a
    claim for indemnification against such liabilities (other than the payment
    by the registrant of expenses incurred or paid by a director, officer or
    controlling person of the registrant in the successful defense of any
    action, suit or proceeding) is asserted by such director, officer or
    controlling person in connection with the securities being registered, the
    registrant will, unless in the opinion of its counsel the matter has been
    settled by controlling precedent, submit to a court of appropriate
    jurisdiction the question whether such indemnification by itself is against
    public policy as expressed in the Act and will be governed by the final
    adjudication of such issue.

                                      II-3
<PAGE>
 
                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the Company
    certifies that it has reasonable grounds to believe that it meets all of the
    requirements for filing on Form S-3 and has duly caused this post-effective
    amendment no. 1 to the registration statement to be signed on its behalf by
    the undersigned, thereunto duly authorized in the Village of Itasca, State
    of Illinois, this 5th day of March, 1998.

                                  FIRST MIDWEST BANCORP, INC.


                                  By:  /s/Robert P. O'Meara
                                     ------------------------------------------
                                       Robert P. O'Meara
                                       President and Chief Executive Officer

<TABLE> 
<CAPTION> 
                  Signature                                       Capacity
                  ---------                                       --------
     <S>                                             <C> 

         /s/Clarence D. Obertwortmann     *          Chairman of the Board of Directors
     --------------------------------------        
           Clarence D. Oberwortmann

         /s/Andrew B. Barber              *          Vice Chairman of the Board of Directors
     --------------------------------------        
          Andrew B. Barber

         /s/Robert P. O'Meara                        President, Principal Executive Officer
     --------------------------------------          and Director       
           Robert P. O'Meara          

         /s/John M. O'Meara               *          Executive Vice President, Principal
     --------------------------------------          Operating Officer and Director 
           John M. O'Meara                          

         /s/Donald J. Swistowicz                     Executive Vice President, Principal
     --------------------------------------          Financial and Accounting Officer
           Donald J. Swistowicz                          

         /s/Vernon A. Brunner             *          Director
     --------------------------------------        
           Vernon A. Brunner

         /s/Bruce S.Chelberg              *          Director
     --------------------------------------        
          Bruce S. Chelberg

         /s/William J. Cowlin             *          Director
     --------------------------------------        
           William J. Cowlin
</TABLE> 

                                      II-4
<PAGE>
 
<TABLE> 
     <S>                                             <C> 

         /s/O. Ralph Edward               *          Director
     --------------------------------------        
          O. Ralph Edwards

         /s/Joseph W. England             *          Director
     --------------------------------------        
           Joseph W. England

         /s/Thomas M. Garvin              *          Director
     --------------------------------------        
           Thomas M. Garvin

         /s/J. Stephen Vanderwoude        *          Director
     --------------------------------------        
           J. Stephen Vanderwoude
</TABLE> 
     __________
          *By Donald J. Swistowicz or Robert P. O'Meara, as Attorney-in-fact.

                                      II-5
<PAGE>
 
                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
                                                                             Sequential
Exhibits                             Description                              Page No.
- --------                             -----------                             ----------
<C>           <S>                                                            <C>
3             Restated Certificate of Incorporation of the Company is
              incorporated herein by reference to Exhibit 3 to Quarterly
              Report on Form 10-Q dated March 31, 1996.

3.1           Amended and Restated By-laws of the Company are
              incorporated herein by reference to Exhibit 3.1 to the
              Company's Annual Report on Form 10-K dated December 31,
              1994.

4             Rights Agreement dated February 15, 1989 is incorporated
              herein by reference to the Company's Form 8-A filed with the
              Securities and Exchange Commission on February 17, 1989.

4.1           Amended and Restated Rights Agreement, Form of Rights
              Certificate and Designation of Series A Preferred Stock of the
              Company, dated November 15, 1995, are incorporated herein
              by reference to Exhibits (1) through (3) of the Company's
              Registration Statement on Form 8-A filed with the Securities
              and Exchange Commission on November 21, 1995, and the
              First Amendment to Rights Agreement, dated June 18, 1997, is
              incorporated herein by reference to Exhibit (4) of the
              Company's Amendment No. 2 to the Registration Statement on
              Form 8-A filed with the Securities and Exchange Commission
              on June 30, 1997.

5             Opinion of Hinshaw & Culbertson regarding legality.*

10.1          Investment Agreement dated June 18, 1997 between the
              Company and all of the stockholders of SparBank,
              Incorporated.*

23.1          Consent of Ernst & Young LLP.

23.2          Consent of KPMG Peat Marwick LLP.

23.3          Consent of Hinshaw & Culbertson (included in Exhibit 5).*

23.4          Consent of Grant Thornton LLP.

24            Power of Attorney*
</TABLE>

* Previously filed.

                                      II-6

<PAGE>
 
                                                                    EXHIBIT 23.1

                        CONSENT OF INDEPENDENT AUDITORS

    We consent to the reference to our firm under the caption "Experts" in
    Amendment No. 1 to the Registration Statement (Form S-3 No. 333-37809) and
    related Prospectus of First Midwest Bancorp, Inc. for the registration of
    1,520,611 shares of its common stock and to the incorporation by reference
    therein of our report dated January 20, 1998, with respect to the
    consolidated financial statements of First Midwest Bancorp. Inc. included in
    its Annual Report (Form 10-K) for the year ended December 31, 1997, filed
    with the Securities and Exchange Commission.

                                        /s/ ERNST & YOUNG LLP

    Chicago, Illinois
    March 2, 1998

<PAGE>
 
                                                                    EXHIBIT 23.2



                       Consent of Independent Accountants
                       ----------------------------------



    The Board of Directors
    First Midwest Bancorp, Inc.



    We consent to the use of our report incorporated herein by reference and to
    the reference to our firm under the heading "Experts" in the prospectus.



                                  /s/ KPMG Peat Marwick LLP



    Chicago, Illinois
    March 4, 1998

<PAGE>
 
                                                                    EXHIBIT 23.4



                       Consent of Independent Accountants
                       ----------------------------------


    We have issued our report dated May 23, 1997, on the consolidated financial
    statements of SparBank, Incorporated and Subsidiary as of December 31, 1996
    and for each of the two years in the period ended December 31, 1996,
    included in the Annual Report on Form 10-K of First Midwest Bancorp, Inc.
    for the year ended December 31, 1997.  We hereby consent to the
    incorporation by reference of our report in the Registration Statement of
    First Midwest Bancorp on the Post-Effective Amendment No. 1 to form S-3
    (File No. 333-37809) and to the use of our name as it appears under the
    caption "EXPERTS."



                                        /s/ Grant Thornton LLP


    Chicago, Illinois
    March 4, 1998


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