GLACIER BANCORP INC
8-K, 1999-09-17
SAVINGS INSTITUTION, FEDERALLY CHARTERED
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<PAGE>   1

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT

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

                Date of Report (Date of earliest event reported):
                                September 9, 1999

                              GLACIER BANCORP, INC.

             (Exact name of registrant as specified in its charter)

                                    DELAWARE
                 (State or other jurisdiction of incorporation)

      000-18911                                            81-0519541
- ------------------------                        -------------------------------
(Commission File Number)                        IRS Employer Identification No.

                                 49 Commons Loop
                               Kalispell, MT 59901
               (Address of principal executive offices) (zip code)

        Registrant's telephone number, including area code: 406-756-4200


<PAGE>   2

ITEM 5 - OTHER EVENTS

        On September 9, 1999, Glacier Bancorp, Inc., Kalispell, Montana
("Glacier") entered into a Plan and Agreement of Merger (the "Merger Agreement")
with Mountain West Bank, an Idaho commercial bank. Under the
terms of the Merger Agreement Mountain West Bank will become a separate,
wholly-owned subsidiary of Glacier.

        Effective at the time of the merger, all shares of Mountain West Bank
will be exchanged for shares of Glacier. Under the terms of the Merger
Agreement, each share of Mountain West Bank stock will be exchanged for 1.18
shares of Glacier stock (subject only to certain conditions stated in the Merger
Agreement).

        Consummation of the merger and share exchange are subject to several
conditions, including receipt of applicable regulatory approvals and approval by
the shareholders of Mountain West Bank. For information regarding the terms of
the proposed transaction, reference is made to the Merger Agreement and the
press release dated September 10, 1999, which are attached hereto as Exhibits 2
and 99, respectively, and incorporated herein by reference. To protect the
deal from uninvited third parties, the parties have executed a "lock-up"
agreement, attached hereto as Exhibit 10, pursuant to which Mountain West Bank
will issue to Glacier 19.9% of Mountain West Bank's outstanding shares,
including options, in the event Mountain West Bank agrees to a third party
acquisition proposal.

ITEM 7 - FINANCIAL STATEMENTS AND EXHIBITS

        (a) Financial statements - not applicable.

        (b) Pro forma financial information - not applicable.

        (c) Exhibits:

                (2) Plan and Agreement of Merger, dated as of September 9, 1999

                (10) Stock Option Agreement, dated as of September 9, 1999

                (99) Press Release issued by Glacier, dated September 10, 1999



                                       2
<PAGE>   3

                                   SIGNATURES

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

        Dated: September 15, 1999

                                            GLACIER BANCORP, INC.

                                            By: /s/ Michael J. Blodnick
                                               ---------------------------------
                                               Michael J. Blodnick
                                               President and Chief Executive
                                               Officer


                                       3

<PAGE>   1

                                   EXHIBIT 2



================================================================================

                          PLAN AND AGREEMENT OF MERGER

                                     BETWEEN

                               MOUNTAIN WEST BANK

                                       AND

                             NEW MOUNTAIN WEST BANK

                              UPON ITS FORMATION BY

                              GLACIER BANCORP, INC.

                          DATED AS OF SEPTEMBER 9, 1999

================================================================================



<PAGE>   2

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                               Page No.
                                                                                               --------
<S>     <C>                                                                                    <C>
SECTION 1  TERMS OF TRANSACTION...................................................................2

        1.1    Transaction........................................................................2
        1.2    Effect of Transaction..............................................................3
        1.3    Prospective Effect.................................................................3
        1.4    Events of Closing..................................................................3
        1.5    Effect on Glacier Common Stock.....................................................3
        1.6    Consideration......................................................................3
        1.7    Payment to Dissenting Stockholders.................................................5
        1.8    Alternative Structures.............................................................5
        1.9    Letter of Transmittal..............................................................5
        1.10   Undelivered Certificates...........................................................6
        1.11   Stock Option Agreement.............................................................6

SECTION 2  CLOSING OF THE TRANSACTION.............................................................6

        2.1    Closing............................................................................6
        2.2    Events of Closing..................................................................6
        2.3    Place of Closing...................................................................6

SECTION 3  REPRESENTATIONS........................................................................6

        3.1    Representations of Glacier and Mountain West.......................................6
        3.2    Mountain West's Additional Representations........................................11
        3.3    Exceptions to Representations.....................................................18

SECTION 4  CONDUCT AND TRANSACTIONS BEFORE CLOSING...............................................18

        4.1    Conduct of Mountain West's Business Before Closing................................18
        4.2    Registration Statement............................................................22
        4.3    Accounting Treatment..............................................................22
        4.4    Submission to Regulatory Authorities..............................................23
        4.5    Announcements.....................................................................23
        4.6    Consents..........................................................................23
        4.7    Further Actions...................................................................23
        4.8    Notice............................................................................24
        4.9    Confidentiality...................................................................24
        4.10   Update of Financial Statements....................................................24
        4.11   Availability of Glacier's Books, Records and Properties...........................24

SECTION 5  APPROVALS AND CONDITIONS..............................................................25

        5.1    Required Approvals................................................................25
        5.2    Conditions to Glacier's Obligations...............................................25
        5.3    Conditions to Mountain West's Obligations.........................................27

SECTION 6  DIRECTORS, OFFICERS AND EMPLOYEES.....................................................28
</TABLE>



                                       i
<PAGE>   3

<TABLE>
<S>     <C>                                                                                    <C>
        6.1    Directors.........................................................................28
        6.2    Employment Agreement..............................................................28
        6.3    Employees.........................................................................29
        6.4    Indemnification...................................................................29
        6.5    Employee Benefit Issues...........................................................30

SECTION 7  TERMINATION OF AGREEMENT AND

              ABANDONMENT OF TRANSACTION.........................................................30

        7.1    Termination by Reason of Lapse of Time............................................30
        7.2    Other Grounds for Termination.....................................................30
        7.3    Mountain West Termination Fee.....................................................31
        7.4    Glacier Termination Fee...........................................................31
        7.5    Cost Allocation Upon Termination..................................................31

SECTION 8  MISCELLANEOUS.........................................................................31

        8.1    Notices...........................................................................31
        8.2    Waivers and Extensions............................................................33
        8.3    General Interpretation............................................................33
        8.4    Construction and Execution in Counterparts........................................33
        8.5    Survival of Representations and Covenants.........................................33
        8.6    Attorneys' Fees and Costs.........................................................33
        8.7    Arbitration.......................................................................33
        8.8    Governing Law and Venue...........................................................34
        8.9    Severability......................................................................34

SECTION 9  AMENDMENTS............................................................................34
</TABLE>

EXHIBITS AND SCHEDULES:

EXHIBIT A       Voting Agreement
EXHIBIT B       Non-Competition Agreement
EXHIBIT C       Form of Affiliate Letter
EXHIBIT D       Form of Opinion for Lukins & Annis, P.S.
EXHIBIT E       Form of Opinion for Graham & Dunn, P.C.
EXHIBIT F       Names and Residences of Combined Bank's Directors and Officers
EXHIBIT G       Amendments to the Combined Bank's Articles and Bylaws

TRANSITION PLAN SCHEDULE

SCHEDULE 1       Exceptions to Representations
SCHEDULE 2       Offices
SCHEDULE 3       Subsidiaries
SCHEDULE 4       Glacier and Mountain West Stock Plans
SCHEDULE 5       Material Contracts
SCHEDULE 6       Mountain West's Required Third Party Consents
SCHEDULE 7       Mountain West's Asset Classification List



                                       ii
<PAGE>   4

SCHEDULE 8       Mountain West's Investments
SCHEDULE 9       Mountain West's Property Encumbrances
SCHEDULE 10      Mountain West's Offices and Branches
SCHEDULE 11      Mountain West's Compliance with Laws
SCHEDULE 12      Mountain West's Litigation Disclosure
SCHEDULE 13      Mountain West's Insurance Policies
SCHEDULE 14      Mountain West's Employee Benefit Plans



                                      iii
<PAGE>   5

                              INDEX OF DEFINITIONS


<TABLE>
<CAPTION>
TERMS                                                              SECTION
- -----                                                              -------
<S>                                                                <C>
Agreement                                                          Intro. Paragraph

ASR                                                                4.3.2

Asset Classification                                               3.2.4

Bank Common Stock                                                  3.1.3(b)(2)

BHCA                                                               Recital A

Closing                                                            1.4

Change in Control                                                  1.3

Columbia                                                           Recital G

Combined Bank                                                      1.2

Company Common Stock                                               3.1.3(b)(1)

Compensation Plans                                                 3.2.14(b)

Continuing Employees                                               6.3

Contracts                                                          3.2.3(b)

Dissenting Shares                                                  1.7

Effective Date                                                     2.1

Employees                                                          3.2.14(b)

Environmental Laws                                                 3.2.15(a)(2)

ERISA                                                              3.2.14(a)

Exchange Act                                                       3.1.5(b)

Exchange Agent                                                     1.6.4(a)

Exchange Ratio                                                     1.6.1

Executive Officer                                                  3.1.8

FDIC                                                               Recital D
</TABLE>



                                       iv
<PAGE>   6

<TABLE>
<CAPTION>
TERMS                                                              SECTION
- -----                                                              -------
<S>                                                                <C>
Federal Reserve Board                                              Recital D

Financial Statements                                               3.1.5(d)(1)

GAAP                                                               3.1.5(d)

Glacier                                                            Intro. Paragraph

Glacier Common Stock                                               3.1.3(a)(1)

Glacier Financial Statements                                       3.1.5(d)(2)

Glacier Option                                                     1.6.5

Glacier Preferred Stock                                            3.1.3(a)(1)

Glacier Shares                                                     1.6.1

Glacier Stock Plans                                                3.1.3(a)(2)

Governmental Entity                                                3.2.3(a)

Hazardous Substances                                               3.2.15(a)(3)

Information Technology                                             3.2.13

IRC                                                                Recital H

Liens                                                              3.1.3(a)(5)

Material Adverse Effect                                            3.1.6

Merger                                                             Recital B

Mountain West                                                      Intro. Paragraph

Mountain West Common Stock                                         1.1

Mountain West Option                                               1.6.5

Mountain West Financial Statements                                 3.1.5(d)(4)

Mountain West Stock Plans                                          3.1.3(b)(2)

New Bank                                                           Intro. Paragraph

OTS                                                                3.1.5(a)
</TABLE>



                                       v
<PAGE>   7

<TABLE>
<CAPTION>
TERMS                                                              SECTION
- -----                                                              -------
<S>                                                                <C>
Pension Plan                                                       3.2.14(c)

Plan/Plans                                                         3.2.14(a)

Property                                                           4.1.10

Prospectus/Proxy Statement                                         4.2.1(a)

Registration Statement                                             4.2.1(a)

Regulatory Approvals                                               Recital D

Reports                                                            3.1.5(b)

SEC                                                                3.1.5(a)

Securities Act                                                     3.1.5(b)

Securities Laws                                                    3.1.5(b)

Stock Option Agreement                                             Recital I

Subject Property                                                   3.2.15(a)(1)

Subsequent Glacier Financial Statements                            3.1.5(d)(3)

Subsequent Mountain West Financial Statements                      3.1.5(d)(5)

Subsidiary/Subsidiaries                                            3.1.2(a)

Tangible Equity Capital                                            5.2.3

Tax                                                                3.2.10

Termination Date                                                   2.1

Transaction                                                        1.1

Transaction Fees                                                   5.2.4

Year 2000 Compliance                                               3.2.13
</TABLE>



                                       iv
<PAGE>   8

                          PLAN AND AGREEMENT OF MERGER
                                     BETWEEN
                               MOUNTAIN WEST BANK
                                       AND
                             NEW MOUNTAIN WEST BANK
                              UPON ITS FORMATION BY
                              GLACIER BANCORP, INC.

        This Plan and Agreement of Merger (the "Agreement"), dated as of
September 9, 1999, is between MOUNTAIN WEST BANK ("Mountain West") and GLACIER
BANCORP, INC. ("Glacier"), acting on its own behalf and on behalf of an Idaho
banking corporation to be formed by it under the title NEW MOUNTAIN WEST BANK
(the "New Bank").

                                    PREAMBLE

        The management and boards of directors of Glacier and Mountain West,
respectively, believe that the proposed transaction between Glacier and Mountain
West, on the terms and conditions set forth in this Agreement, is in the best
interests of Glacier's and Mountain West's stockholders.

                                    RECITALS

A.      THE PARTIES. The parties to the Merger are as follows:

        (1)     Mountain West is a state-chartered banking corporation duly
                organized and validly existing under Idaho law with its
                principal office located in Coeur d'Alene, Idaho.

        (2)     Glacier is a corporation duly organized and validly existing
                under Delaware law and is a registered bank holding company
                under the Bank Holding Company Act of 1956, as amended ("BHCA").
                Glacier's principal office is located in Kalispell, Montana.
                Glacier owns (1) all of the outstanding common stock of Glacier
                Bank, First Security Bank of Missoula, Valley Bank of Helena,
                and Big Sky Western Bank; and (2) 94 and 98% of the outstanding
                common stock of Glacier Bank of Whitefish and Glacier Bank of
                Eureka, respectively.

        (3)     New Bank will be organized by persons designated by Glacier who
                will, upon execution of this Agreement by Mountain West and
                Glacier, apply for preliminary approval from the State of Idaho
                for New Bank to become an interim state banking corporation.
                Upon receipt of such preliminary approval, New Bank will become
                a body corporate and will execute this Agreement, thereby
                becoming a party hereto and ratifying all prior actions taken on
                its behalf by Glacier. All of the capital stock of New Bank will
                be subscribed for solely by Glacier, and the consideration for
                such stock will be paid in before the Effective Date.

B.      THE MERGER. On the Effective Date, all of the outstanding shares of
        Mountain West common stock will be exchanged for shares of Glacier
        Common Stock, and Mountain West will become a wholly-owned subsidiary of
        Glacier.

C.      BOARD APPROVALS. Glacier's and Mountain West's respective boards of
        directors have approved this Agreement and authorized its execution and
        delivery.



                                       1
<PAGE>   9

D.      OTHER APPROVALS.  The Merger is subject to:

        (1)     Satisfaction of the conditions described in this Agreement;

        (2)     Approval by Mountain West's stockholders; and

        (3)     Approval or acquiescence, as appropriate, by (a) the Board of
                Governors of the Federal Reserve System ("Federal Reserve
                Board"), (b) the Federal Deposit Insurance Corporation ("FDIC"),
                and (c) the State of Idaho (collectively, "Regulatory
                Approvals").

E.      EMPLOYMENT AGREEMENTS. Mountain West has entered into an employment
        agreement, effective as of the Effective Date, with Jon W. Hippler,
        Mountain West's President and Chief Executive Officer. In addition to
        remaining as Mountain West's President and CEO, Mr. Hippler will also be
        appointed to the Glacier board of directors. It is anticipated that
        Mountain West will also enter into employment agreements with Robert
        Beck, Diane Reed, Ronn C. Rich and Paula Smyly.

F.      DIRECTOR AGREEMENTS. In association with the parties' execution of this
        Agreement, the directors and officers of Mountain West have entered into
        agreements, substantially in the form attached to this Agreement as
        Exhibit A, pursuant to which, among other things, each such individual
        has agreed to vote his or her shares of Mountain West common stock in
        favor of the actions contemplated by this Agreement. In addition, all
        such directors and officers have entered into non-competition
        agreements, substantially in the form attached to this Agreement as
        Exhibit B.

G.      FAIRNESS OPINION. Mountain West has received from Columbia Financial
        Advisors ("Columbia") and delivered to Glacier an opinion to the effect
        that the financial terms of the Transaction are financially fair to
        Mountain West's stockholders. As a condition to Closing of the
        Transaction, Columbia will update this fairness opinion (1) immediately
        before Mountain West mails the Prospectus/Proxy Statement to its
        stockholders and (2) immediately before Closing.

H.      INTENTION OF THE PARTIES--ACCOUNTING AND TAX TREATMENT. The parties
        intend the Merger to qualify, for accounting purposes, as a "pooling of
        interests." The parties intend the Merger to qualify, for federal income
        tax purposes, as a tax-free reorganization under Section 368(a) of the
        Internal Revenue Code of 1986, as amended ("IRC").

I.      STOCK OPTION AGREEMENT. As an inducement to and condition of Glacier's
        execution of this Agreement, Mountain West has approved the grant of an
        option to Glacier under the Stock Option Agreement, as provided in
        Subsection 1.11.

                                    AGREEMENT

Glacier and Mountain West agree as follows:

                                    SECTION 1
                              TERMS OF TRANSACTION

1.1     TRANSACTION. Under and subject to this Agreement and the other documents
        referred to in this Agreement, Glacier will acquire all of the
        outstanding common stock shares of Mountain West ("Mountain West Common
        Stock"). All outstanding shares of Mountain West Common Stock will be
        exchanged for common stock shares of Glacier ("Glacier Common Stock").
        The term "Transaction" means the Merger transaction contemplated by this
        Agreement, subject to any modifications Glacier elects in accordance
        with Subsection 1.8.



                                       2
<PAGE>   10

1.2     EFFECT OF TRANSACTION. On the Effective Date, the corporate existence of
        each of Mountain West and the New Bank will be merged into and continued
        in the resulting bank of the Merger (the "Combined Bank"). The principal
        office of the Combined Bank will be located in Coeur d'Alene, Idaho, and
        will be deemed to be the same corporation as each of Mountain West and
        the New Bank. The authorized capital of the Combined Bank will consist
        of 1,500,000 shares of common stock, $2.50 par value per share. The
        Articles of Incorporation and the Bylaws of the Combined Bank will be
        the Articles of Incorporation and the Bylaws of Mountain West in effect
        immediately before the Effective Time, subject to the amendments to the
        Articles and Bylaws attached to this Agreement as Exhibit G. All rights,
        franchises and interests of each of Mountain West and the New Bank in
        and to every type of property (real, personal and mixed) and choses in
        action will be transferred to and vested in the Combined Bank by virtue
        of the Merger without any deed or other transfer. The Combined Bank,
        upon the Effective Date and without any order or other action on the
        part of any court or otherwise, will hold and enjoy all rights of
        property, franchises, and interests in the same manner and to the same
        extent as such rights, franchises and interests were held or enjoyed by
        each of the Bank and New Bank immediately prior to the Effective Date,
        subject to the conditions of Title 26 of the Idaho Statutes. The name of
        the Combined Bank will be "Mountain West Bank."

1.3     PROSPECTIVE EFFECT. Subject to a Change in Control of Glacier, the
        following provisions will apply: (a) the Combined Bank will retain the
        name "Mountain West Bank" for at least 3 years following the Effective
        Date; (b) there will be no data processing or system computer
        conversions for Mountain West for at least 2 years following the
        Effective Date; and (c) subject to Glacier and its subsidiaries
        remaining well-capitalized, within 2 years of the Effective Date and at
        the request of Mountain West, Glacier will provide sufficient capital
        for Mountain West to expand by 2 branches and for construction of a
        permanent Boise branch building. "Change in Control" means a change "in
        the ownership or effective control" or "in the ownership of a
        substantial portion of the assets" of Mountain West, within the meaning
        of section 280G of the Internal Revenue Code.

1.4     EVENTS OF CLOSING. Closing of the Transaction will take place in
        accordance with Section 2 ("Closing"). All shares, other than Dissenting
        Shares, of Mountain West Common Stock issued and outstanding immediately
        before Closing will be exchanged at Closing for shares of Glacier Common
        Stock in accordance with Subsection 1.6 by virtue of the Merger and
        without any further action required by the holders of Mountain West
        Common Stock. After Closing and subject to any Dissenting Shares,
        Glacier will own all of the outstanding shares of Mountain West Common
        Stock. The Board of Directors of Mountain West after the Effective Date
        will consist of Mountain West's directors immediately before the Merger,
        with the addition of Michael J. Blodnick (or, if Mr. Blodnick is unable
        to serve, another individual designated by Glacier). Nothing in this
        Agreement is intended to restrict any rights of Mountain West's
        stockholder and directors at any time after the Effective Date to
        nominate, elect, select, or remove directors. As required by Section
        26-903 (c) of the Idaho Statutes, the names and residences of the
        proposed officers and directors of the Combined Bank are listed on
        Exhibit F.

1.5     EFFECT ON GLACIER COMMON STOCK. Glacier Common Stock shares issued and
        outstanding immediately before the Effective Date will remain
        outstanding and unchanged after the Merger.

1.6     CONSIDERATION.

        1.6.1   EXCHANGE RATIO. Subject to the conditions and limitations in
                this Agreement, holders of Mountain West Common Stock will
                receive Glacier Common Stock in exchange for their Mountain West
                Common Stock. The number (rounded to 2 decimals, rounding down
                if the third decimal is four or less or up if it is five or
                more) of Glacier Common Stock shares each holder will receive in
                exchange for each Mountain West Common Stock share he or she
                holds of record on the Effective Date (the "Exchange Ratio")
                will be 1.18, subject to Subsections 1.6.2 (change



                                       3
<PAGE>   11

                in equity capital) and 1.7 (dissenting shares). The shares of
                Glacier Common Stock to be issued to Mountain West Common
                Stockholders under this Agreement in connection with the
                Transaction are referred to as the "Glacier Shares."

        1.6.2   CHANGE IN EQUITY CAPITAL. If, after the date of this Agreement
                but before the Effective Date, Glacier's or Mountain West's
                Common Stock issued and outstanding increases or decreases in
                number or is changed into or exchanged for a different kind or
                number of securities, through a recapitalization,
                reclassification, stock dividend, stock split, reverse stock
                split or other similar change in capitalization (not including
                increases in number due to issuances of shares upon exercise of
                any outstanding options to purchase Glacier Common Stock shares)
                of Glacier or Mountain West, as the case may be, then, as
                appropriate, the parties will make the proportionate adjustment
                to the Exchange Ratio.

        1.6.3   NO FRACTIONAL SHARES. No fractional shares of Glacier
                Corporation Common Stock will be issued. In lieu of fractional
                shares, if any, each stockholder of Mountain West who is
                otherwise entitled to receive a fractional share of Glacier
                Common Stock will receive an amount of cash equal to the product
                of such fraction times $20. Such fractional share interests will
                not include the right to vote or receive dividends or any
                interest on dividends.

        1.6.4   CERTIFICATES.

                (a)     Surrender of Certificates. Each certificate evidencing
                        Mountain West Common Stock shares (other than Dissenting
                        Shares) will, on and after the Effective Date, be deemed
                        for all corporate purposes to represent and evidence
                        only the right to receive a certificate representing the
                        Glacier Shares (or to receive the cash for fractional
                        shares) to which the Mountain West Common Stock shares
                        converted in accordance with the provisions of this
                        Subsection 1.6. Following the Effective Date, Mountain
                        West stockholders shall exchange Mountain West Common
                        Stock certificates by surrendering them to the agent
                        ("Exchange Agent") designated by Glacier and Mountain
                        West to effect the exchange of Mountain West Common
                        Stock certificates for certificates representing Glacier
                        Shares (or for cash in lieu of fractional shares), in
                        accordance with any instructions provided by the
                        Exchange Agent and together with a properly completed
                        and executed form of transmittal letter. Until a
                        holder's certificate evidencing Mountain West Common
                        Stock is so surrendered, the holder will not be entitled
                        to receive any certificates evidencing Glacier Shares or
                        cash in lieu of fractional shares.

                (b)     Issuance of Certificates in Other Names. Any person
                        requesting that any certificate evidencing Glacier
                        Shares be issued in a name other than the name in which
                        the surrendered Mountain West Common Stock certificate
                        is registered, must: (1) establish to the Exchange
                        Agent's satisfaction the right to receive the
                        certificate evidencing Glacier Shares and (2) either pay
                        to the Exchange Agent any applicable transfer or other
                        taxes or establish to the Exchange Agent's satisfaction
                        that all applicable taxes have been paid or are not
                        required.

                (c)     Lost, Stolen, and Destroyed Certificates. The Exchange
                        Agent will be authorized to issue a certificate
                        representing Glacier Shares in exchange for a Mountain
                        West Common Stock certificate that has been lost, stolen
                        or destroyed, if the holder provides the Exchange Agent
                        with: (1) satisfactory evidence that the holder owns
                        Mountain West Common Stock and that the certificate
                        representing this ownership is lost, stolen, or



                                       4
<PAGE>   12

                        destroyed, (2) any appropriate affidavit the Exchange
                        Agent may require, and (3) any indemnification
                        assurances that the Exchange Agent may require.

                (d)     Rights to Dividends and Distributions. After the
                        Effective Date, no holder of a certificate evidencing
                        Mountain West Common Stock shares will be entitled to
                        receive any dividends or other distributions otherwise
                        payable to holders of record of Glacier Common Stock on
                        any date after the Effective Date, unless the holder (1)
                        is entitled by this Agreement to receive a certificate
                        representing Glacier Shares and (2) has surrendered in
                        accordance with this Agreement his or her Mountain West
                        Common Stock certificates (or has met the requirements
                        of Subsection 1.6.4((c)) above) in exchange for
                        certificates representing Glacier Shares. Surrender of
                        Mountain West Common Stock certificates will not deprive
                        the holder of any dividends or distributions that the
                        holder is entitled to receive as a record holder of
                        Mountain West Common Stock on a date before the
                        Effective Date. When the holder surrenders his or her
                        certificates, the holder will receive the amount,
                        without interest, of any cash dividends and any other
                        distributions distributed after the Effective Date on
                        the whole number of shares of Glacier Shares into which
                        the holder's Mountain West Common Stock was converted at
                        the Effective Date.

                (e)     Checks in Other Names. Any person requesting that a
                        check for cash in lieu of fractional shares be issued in
                        a name other than the name in which the Mountain West
                        Common Stock certificate surrendered in exchange for the
                        cash is registered, must establish to the Exchange
                        Agent's satisfaction the right to receive this cash.

        1.6.5   EFFECT ON MOUNTAIN WEST OPTIONS. On the Effective Date, by
                virtue of the Merger, and without any action on the part of any
                party, any option to acquire Mountain West Common Stock,
                excluding the option under the Stock Option Agreement ("Mountain
                West Option"), will be converted into and become an option to
                purchase Glacier Common Stock ("Glacier Option") on the same
                terms and conditions as are in effect with respect to the
                Mountain West Option immediately prior to the Effective Date,
                except that (A) each such Glacier Option may be exercised solely
                for shares of Glacier Common Stock, (B) the number of shares of
                Glacier Common Stock subject to such Glacier Option will be
                equal to the number of shares of Mountain Common Stock subject
                to such option immediately prior to the Effective Date
                multiplied by the Exchange Ratio, the product being rounded, if
                necessary, up or down to the nearest whole share, and (C) the
                per share exercise price under each such Glacier Option will be
                adjusted by dividing the Mountain West Option exercise price by
                the Exchange Ratio and rounding up or down to the nearest cent.

1.7     PAYMENT TO DISSENTING STOCKHOLDERS. For purposes of this Agreement,
        "Dissenting Shares" means those shares of Mountain West Common Stock as
        to which stockholders have properly taken all steps necessary to perfect
        their dissenters' rights under Section 26-909 of the Idaho Statutes.
        Each outstanding Dissenting Share of Mountain West Common Stock will be
        converted at Closing into the rights provided under this section of the
        Idaho Statutes. For purposes of (beta) 26-909 (2) of the Idaho Statutes,
        the parties to this Agreement hereby fix $21 as the fair market value of
        dissenting shares of Mountain West Common Stock.

1.8     ALTERNATIVE STRUCTURES. Subject to the conditions set forth below,
        Glacier may in its sole discretion elect to consummate the Transaction
        by means other than those specified in this Section 1. If Glacier so
        elects, any means, procedures, or amendments necessary or desirable to
        consummate the Transaction, in the opinion of Glacier's counsel, will
        supersede any conflicting, undesirable or unnecessary provisions of this
        Agreement. But, unless this Agreement is amended in accordance with
        Section 9, the following



                                       5
<PAGE>   13
        conditions will apply: (1) the type and amount of consideration set
        forth in Subsection 1.6 will not be modified and (2) the tax
        consequences to Mountain West and its stockholders will not be adversely
        affected.

1.9     LETTER OF TRANSMITTAL. Glacier will prepare a transmittal letter form
        reasonably acceptable to Mountain West for use by stockholders holding
        Mountain West Common Stock. Certificates representing shares of Mountain
        West Common Stock must be delivered for payment in the manner provided
        in the transmittal letter form. On or about the Effective Date, Glacier
        will mail the transmittal letter form to Mountain West stockholders.

1.10    UNDELIVERED CERTIFICATES. If outstanding certificates for Mountain West
        Common Stock are not surrendered or the payment for them is not claimed
        before those payments would escheat or become the property of any
        governmental unit or agency, the unclaimed items will, to the extent
        permitted by abandoned property or any other applicable law, become the
        property of Glacier (and to the extent not in its possession will be
        paid over to Glacier), free and clear of all claims or interests of any
        person previously entitled to such items. But, neither Glacier nor
        Mountain West will be liable to any holder of Mountain West Common Stock
        for any amount paid to any governmental unit or agency having
        jurisdiction over any such unclaimed items under the abandoned property
        or other applicable law of the jurisdiction, and Glacier will pay no
        interest on amounts owed to stockholders for shares of Mountain West
        Common Stock.

1.11    STOCK OPTION AGREEMENT. As a condition to the execution of this
        Agreement, Glacier and Mountain West have executed a Stock Option
        Agreement, dated the same date as this Agreement.

                                    SECTION 2
                           CLOSING OF THE TRANSACTION

2.1     CLOSING. Closing will occur on the Effective Date. If Closing does not
        occur on or before March 31, 2000 ("Termination Date"), either Glacier
        or Mountain West may terminate this Agreement in accordance with Section
        7. Unless Glacier and Mountain West agree upon another date, the
        Effective Date will be a date selected by Glacier within 30 calendar
        days after the following, but no sooner than January 17, 2000:

        (a) each condition precedent set forth in Section 5 has been either
        fulfilled or waived; and

        (b) each approval required by Section 5 has been granted, and all
        applicable waiting periods have expired.

2.2     EVENTS OF CLOSING. On the Effective Date, all properly executed
        documents required by this Agreement will be delivered to the proper
        party in form consistent with this Agreement. If any party fails to
        deliver a required document on the Effective Date or otherwise defaults
        under this Agreement on or before the Effective Date, then the
        Transaction will not occur unless the adversely affected party waives
        the default.

2.3     PLACE OF CLOSING. Unless Glacier and Mountain West agree otherwise,
        Closing will occur on the Effective Date at Glacier's corporate office,
        49 Commons Loop, Kalispell, Montana.



                                       6
<PAGE>   14

                                    SECTION 3
                                 REPRESENTATIONS

3.1     REPRESENTATIONS OF GLACIER AND MOUNTAIN WEST. Subject to Subsection 3.3
        and except as expressly set forth in Schedule 1, Glacier (and as
        appropriate, New Bank) represents to Mountain West, and Mountain West
        represents to Glacier and New Bank, the following:

        3.1.1   CORPORATE ORGANIZATION AND QUALIFICATION.

                (a)     It is a corporation duly organized and validly existing
                        under the state laws of either Idaho or Delaware (as
                        applicable), and its activities do not require it to be
                        qualified in any jurisdiction other than Montana (for
                        Glacier) and Idaho (for Mountain West).

                (b)     It has the requisite corporate power and authority to
                        own or lease its properties and assets and to carry on
                        its businesses as they are now being conducted.

                (c)     It has made available to the other party to this
                        Agreement a complete and correct copy of its certificate
                        or articles of incorporation and bylaws, each as amended
                        to date and currently in full force and effect.

        3.1.2   SUBSIDIARIES.

                (a)     With respect to Mountain West only, Schedule 3 lists all
                        of its Subsidiaries and its percentage ownership of
                        these Subsidiaries, as of the date of this Agreement. In
                        this Agreement, the term "Subsidiary" with respect to a
                        party means any corporation, partnership, financial
                        institution, trust company, or other entity owned or
                        controlled by that party or any of its subsidiaries or
                        affiliates (or owned or controlled by that party
                        together with one or more of its subsidiaries or
                        affiliates). A Subsidiary is considered to be owned or
                        controlled by a party if that party or any of its
                        Subsidiaries (individually or together with the party)
                        directly or indirectly owns, controls, or has the
                        ability to exercise 50% or more of the voting power of
                        the Subsidiary.

                (b)     Each of its Subsidiaries is a corporation duly organized
                        and validly existing under Montana or Idaho law, as the
                        case may be, and is qualified to do business and in good
                        standing in each jurisdiction where the property owned,
                        leased, or operated, or the business conducted by the
                        Subsidiary, requires this qualification.

                (c)     Each of its Subsidiaries has the requisite corporate
                        power and authority to own or lease its properties and
                        assets and to carry on its business as it is now being
                        conducted.

        3.1.3 CAPITAL STOCK.

                (a) Glacier. Glacier represents:

                        (1)     on the date this Agreement was signed, Glacier's
                                authorized capital stock consists of 16 million
                                shares divided into two classes: (i) 15 million
                                shares of common stock, par value $.01 per share
                                ("Company Common Stock"), _______________ shares
                                of which are issued and outstanding and (ii) 1
                                million shares of blank-check preferred stock,
                                par value $.01 per share, none of which is
                                outstanding ("Glacier Preferred Stock");



                                       7
<PAGE>   15

                        (2)     options or rights to acquire not more than an
                                aggregate of _____________ Company Common Stock
                                shares (subject to adjustment on the terms set
                                forth in the Glacier Stock Plans) are
                                outstanding under the stock option plans listed
                                in Schedule 4 ("Glacier Stock Plans");

                        (3)     No Company Common Stock shares are reserved for
                                issuance, other than the shares reserved for
                                issuance under the Glacier Stock Plans, and
                                Glacier has no shares of Glacier Preferred Stock
                                reserved for issuance;

                        (4)     all outstanding shares of Company Common Stock
                                have been duly authorized and validly issued and
                                are fully paid and nonassessable;

                        (5)     all outstanding shares of capital stock of each
                                of Glacier's Subsidiaries owned by Glacier or a
                                Subsidiary of Glacier have been duly authorized
                                and validly issued and are fully paid and
                                nonassessable, except to the extent any
                                assessment is required under federal law, and
                                are owned by Glacier or a Subsidiary of Glacier
                                free and clear of all liens, pledges, security
                                interests, claims, proxies, preemptive or
                                subscriptive rights or other encumbrances or
                                restrictions of any kind (collectively,
                                "Liens"); and

                        (6)     except as set forth in this Agreement or in the
                                Glacier Stock Plans, there are no preemptive
                                rights or any outstanding subscriptions,
                                options, warrants, rights, convertible
                                securities, or other agreements or commitments
                                of Glacier or any of its Subsidiaries of any
                                character relating to the issued or unissued
                                capital stock or other equity securities of
                                Glacier (including those relating to the
                                issuance, sale, purchase, redemption,
                                conversion, exchange, registration, voting or
                                transfer of such stock or securities).

                (b)     Mountain West. Mountain West represents:

                        (1)     Schedule 2 contains a complete list of all of
                                its banking offices.

                        (2)     as of the date of this Agreement, Mountain
                                West's authorized capital stock consists of (i)
                                1,500,000 shares of common stock, $2.50 par
                                value ("Bank Common Stock"), 715,472 shares of
                                which are issued and outstanding,

                        (3)     options or rights to acquire not more than an
                                aggregate of 115,019 Bank Common Stock shares
                                (subject to adjustment on the terms set forth in
                                the Mountain West Stock Plans) are outstanding
                                under the stock option plans listed in Schedule
                                4 ("Mountain West Stock Plans");

                        (4)     no Bank Common Stock shares are reserved for
                                issuance, other than the shares reserved for
                                issuance under the Mountain West Stock Plan;

                        (5)     all outstanding Mountain West Common Stock
                                shares have been duly authorized and validly
                                issued and are fully paid and nonassessable,
                                except to the extent of any assessment required
                                under (beta) 26-1113 of the Idaho Statutes;

                        (6)     all outstanding shares of capital stock of each
                                of Mountain West's Subsidiaries have been duly
                                authorized and validly issued and are fully paid
                                and nonassessable, and, except as otherwise
                                provided in this Agreement, at Closing



                                       8
<PAGE>   16

                                will be owned by Mountain West or a Subsidiary
                                of Mountain West free and clear of all Liens;

                        (7)     There are no preemptive rights or any
                                outstanding subscriptions, options, warrants,
                                rights, convertible securities, or other
                                agreements or commitments of Mountain West or
                                any of its Subsidiaries of any character
                                relating to the issued or unissued capital stock
                                or other equity securities of Mountain West or
                                any of its Subsidiaries (including those
                                relating to the issuance, sale, purchase,
                                redemption, conversion, exchange, registration,
                                voting or transfer of such stock or securities);

                        (8)     it (alone or together with any of its
                                Subsidiaries) owns all of the shares of capital
                                stock (or 100% of any other applicable form of
                                ownership interest if the Subsidiary is not a
                                corporation) of each of its Subsidiaries free
                                and clear of all encumbrances.

        3.1.4 CORPORATE AUTHORITY.

                (a)     It has the requisite corporate power and authority and
                        has taken all corporate action necessary in order to
                        execute and deliver this Agreement, subject (in Mountain
                        West's case) only to the approval by Mountain West's
                        stockholders of the plan of Merger contained in this
                        Agreement to the extent required by Section 26-904 of
                        the Idaho Statutes, to complete the Transaction.

                (b)     This Agreement is a valid and legally binding agreement
                        of it, enforceable in accordance with the terms of this
                        Agreement.

        3.1.5 REPORTS AND FINANCIAL STATEMENTS.

                (a)     Filing of Reports. Since January 1, 1996, it and each of
                        its Subsidiaries has filed all reports and statements,
                        together with any required amendments to these reports
                        and statements, that it was required to file with (1)
                        the Securities and Exchange Commission ("SEC"), (2) the
                        Federal Reserve Board, (3) the FDIC, (4) the Office of
                        Thrift Supervision ("OTS") and (5) any other applicable
                        federal or state banking, insurance, securities, or
                        other regulatory authorities. Each of these reports and
                        statements, including the related financial statements
                        and exhibits, complied (or will comply, in the case of
                        reports or statements filed after the date of this
                        Agreement) as to form in all material respects with all
                        applicable statutes, rules and regulations as of their
                        respective dates (and, in the case of reports or
                        statements filed before the date of this Agreement,
                        without giving effect to any amendments or modifications
                        filed after the date of this Agreement).

                (b)     Delivery to Other Party of Reports. It has delivered to
                        the other party a copy of each registration statement,
                        offering circular, report, definitive proxy statement or
                        information statement under the Securities Act of 1933,
                        as amended, ("Securities Act"), the Securities Exchange
                        Act of 1934, as amended, ("Exchange Act"), and state
                        securities and "Blue Sky" laws (collectively, the
                        "Securities Laws") filed, used or circulated by it with
                        respect to periods since January 1, 1996, through the
                        date of this Agreement. It will promptly deliver to the
                        other party each such registration statement, offering
                        circular, report, definitive proxy statement or
                        information statement filed, used or circulated after
                        the date of this Agreement (collectively, its
                        "Reports"), each in the form (including



                                       9
<PAGE>   17

                        related exhibits and amendments) filed with the SEC or
                        the FDIC (or if not so filed, in the form used or
                        circulated).

                (c)     Compliance with Securities Laws. As of their respective
                        dates (and without giving effect to any amendments or
                        modifications filed after the date of this Agreement),
                        each of the Reports, including the related financial
                        statements, exhibits and schedules, filed, used or
                        circulated before the date of this Agreement complied
                        (and each of the Reports filed after the date of this
                        Agreement, will comply) in all material respects with
                        applicable Securities Laws, and did not (or in the case
                        of reports, statements, or circulars filed after the
                        date of this Agreement, will not) contain any untrue
                        statement of a material fact or omit to state a material
                        fact required to be stated therein or necessary to make
                        the statements made therein, in light of the
                        circumstances under which they were made, not
                        misleading.

                (d)     Financial Statements. Each of its balance sheets
                        included in the Financial Statements fairly presents
                        (or, in the case of Financial Statements for periods
                        ending on a date following the date of this Agreement,
                        will fairly present) the consolidated financial position
                        of it and its Subsidiaries as of the date of the balance
                        sheet. Each of the consolidated statements of income,
                        cash flows and stockholders' equity included in the
                        Financial Statements fairly presents (or, in the case of
                        Financial Statements for periods ending on a date
                        following the date of this Agreement, will fairly
                        present) the consolidated results of operations,
                        retained earnings and cash flows, as the case may be, of
                        it and its Subsidiaries for the periods set forth in
                        these statements (subject, in the case of unaudited
                        statements, to normal year-end audit adjustments), in
                        each case in accordance with generally accepted
                        accounting principles, consistently applied ("GAAP"),
                        except as may be noted in these statements.

                        (1)     "Financial Statements" means: (i) in Glacier's
                                case, the Glacier Financial Statements (or for
                                periods ending on a date following the date of
                                this Agreement, the Subsequent Glacier Financial
                                Statements); and (ii) in Mountain West's case,
                                the Mountain West Financial Statements (or for
                                periods ending on a date following the date of
                                this Agreement, the Subsequent Mountain West
                                Financial Statements).

                        (2)     "Glacier Financial Statements" means Glacier's
                                (i) audited consolidated statements of financial
                                condition as of December 31, 1998 and 1997, and
                                the related audited statements of income,
                                cashflows and changes in stockholders' equity
                                for each of the years ended December 31, 1998
                                and 1997; and (ii) unaudited consolidated
                                statements of financial condition as of the end
                                of each fiscal quarter following December 31,
                                1998 but preceding the date of this Agreement,
                                and the related unaudited statements of income,
                                cashflows and changes in stockholders' equity
                                for each such quarter.

                        (3)     "Subsequent Glacier Financial Statements" means
                                unaudited balance sheets and related statements
                                of income and stockholders' equity for each of
                                the fiscal quarters ending after the date of
                                this Agreement and before Closing.

                        (4)     "Mountain West Financial Statements" means
                                audited statements of financial condition as of
                                March 31, 1999, 1998 and 1997, and the related
                                audited statements of income, cashflows and
                                changes in stockholders' equity for each of the
                                years ended March 31, 1999, 1998 and 1997; and
                                (ii) unaudited consolidated



                                       10
<PAGE>   18

                                statements of financial condition as of the end
                                of each fiscal quarter following March 31, 1999
                                but preceding the date of this Agreement, and
                                the related unaudited statements of income,
                                cashflows and changes in stockholders' equity
                                for each such quarter.

                        (5)     "Subsequent Mountain West Financial Statements"
                                means unaudited balance sheets and related
                                statements of income and stockholders' equity
                                for each of Mountain West's fiscal quarters
                                ending after the date of this Agreement and
                                before Closing.

        3.1.6   ABSENCE OF CERTAIN EVENTS AND CHANGES. Except as disclosed in
                its Financial Statements and Reports, since December 31, 1998
                (for Glacier) and March 31, 1999 (for Mountain West): (1) it and
                its Subsidiaries have conducted their respective businesses only
                in the ordinary and usual course of the businesses and (2) no
                change or development or combination of changes or developments
                has occurred that, individually or in the aggregate, is
                reasonably likely to result in a Material Adverse Effect with
                respect to it or its Subsidiaries. For purposes of this
                Agreement, "Material Adverse Effect" with respect to any
                corporation means an effect that: (1) is materially adverse to
                the business, financial condition, results of operations or
                prospects of the corporation and its Subsidiaries taken as a
                whole; (2) significantly and adversely affects the ability of
                the corporation to consummate the transactions contemplated by
                this Agreement by the Termination Date or to perform its
                material obligations under this Agreement; or (3) enables any
                persons to prevent the consummation by the Termination Date of
                the transactions contemplated by this Agreement. No Material
                Adverse Effect will be deemed to have occurred on the basis of
                any effect resulting from actions or omissions of the
                corporation taken with the explicit prior consent of the other
                party to this Agreement.

        3.1.7   MATERIAL AGREEMENTS.

                (a)     Except for the Glacier and Mountain West Stock Plans,
                        respectively, and arrangements made after the date and
                        in accordance with the terms of this Agreement, it and
                        its Subsidiaries are not bound by any material contract
                        (as defined in Item 601(b)(10) of Regulation S-K under
                        the Securities Act) that: (1) is to be performed after
                        the date of this Agreement and (2) has not been filed
                        with or incorporated by reference in its Reports or set
                        forth in Schedule 5.

                (b)     Neither it nor any of its Subsidiaries is in default
                        under any contract, agreement, commitment, arrangement,
                        lease, insurance policy, or other instrument.

        3.1.8   KNOWLEDGE AS TO CONDITIONS. Its President, Chief Executive
                Officer, and Chief Financial Officer (collectively, "Executive
                Officers") know of no reason the Regulatory Approvals and, to
                the extent necessary, any other approvals, authorizations,
                filings, registrations, and notices should not be obtained
                without the imposition of any condition or restriction that is
                reasonably likely to have a Material Adverse Effect with respect
                to it, its Subsidiaries, or the Combined Bank, or the opinion of
                the tax experts referred to in Subsection 5.2.13.

        3.1.9   BROKERS AND FINDERS. Neither it, its Subsidiaries, nor any of
                their respective officers, directors or employees has employed
                any broker or finder or incurred any liability for any brokerage
                fees, commissions or finder's fees in connection with the
                transactions contemplated in this Agreement.



                                       11
<PAGE>   19



3.2     MOUNTAIN WEST'S ADDITIONAL REPRESENTATIONS. Subject to Subsection 3.3
        and except as expressly set forth in Schedule 1, Mountain West
        represents to Glacier, the following:

        3.2.1   LOAN AND LEASE LOSSES. Its Executive Officers know of no reason
                why the allowance for loan and lease losses shown in the balance
                sheets included in the Financial Statements for the periods
                ended December 31, 1998, March 31, 1999, and June 30, 1999, was
                not adequate as of those dates, respectively, to provide for
                estimable and probable losses, net of recoveries relating to
                loans not previously charged off, inherent in its loan
                portfolio.

        3.2.2   NO STOCK OPTION PLANS. Neither it nor any of its Subsidiaries
                has adopted any stock option plans or granted any options or
                rights to acquire any shares of Mountain West Common Stock or
                capital stock or other ownership interest of any Mountain West
                Subsidiary except as expressly set forth in Schedule 4.

        3.2.3   GOVERNMENTAL FILINGS; NO VIOLATIONS.

                (a)     Filings. Other than the Regulatory Approvals and other
                        than as required under the Securities Act, the Exchange
                        Act, and state securities and "Blue Sky" laws, no
                        notices, reports or other filings are required to be
                        made by it with, nor are any consents, registrations,
                        approvals, permits or authorizations required to be
                        obtained by it from, any governmental or regulatory
                        authority, agency, court, commission or other entity,
                        domestic or foreign ("Governmental Entity"), in
                        connection with the execution, delivery or performance
                        of this Agreement by it and the consummation by it of
                        the Transaction.

                (b)     Violations. The execution, delivery and performance of
                        this Agreement does not and will not, and the
                        consummation by it of the Transaction will not,
                        constitute or result in: (1) a breach or violation of,
                        or a default under, its articles of incorporation or
                        bylaws, or the comparable governing instruments of any
                        of its Subsidiaries; (2) a breach or violation of, or a
                        default under, or the acceleration of or the creation of
                        a Lien (with or without the giving of notice, the lapse
                        of time or both) under, any provision of any agreement,
                        lease, contract, note, mortgage, indenture, arrangement
                        or other obligation ("Contracts") of it or any of its
                        Subsidiaries; or (3) a violation of any law, rule,
                        ordinance or regulation or judgment, decree, order,
                        award, or governmental or non-governmental permit or
                        license to which it or any of its Subsidiaries is
                        subject; or (4) any change in the rights or obligations
                        of any party under any of the Contracts. Schedule 6
                        contains a list of all consents it or its Subsidiaries
                        must obtain from third parties under any Contracts
                        before consummation of the Transaction.

        3.2.4   ASSET CLASSIFICATION.

                (a)     Schedule 7 sets forth a list, accurate and complete as
                        of June 30, 1999, except as otherwise expressly noted in
                        Schedule 7, and separated by category of classification
                        or criticism ("Asset Classification"), of the aggregate
                        amounts of loans, extensions of credit and other assets
                        of it and its Subsidiaries that have been criticized or
                        classified by any Governmental Entity, by any outside
                        auditor, or by any internal audit.

                (b)     Except as shown on Schedule 7, no amounts of loans,
                        extensions of credit or other assets that have been
                        classified or criticized by any representative of any
                        Governmental Entity as "Other Assets Especially
                        Mentioned," "Substandard," "Doubtful," "Loss" or words
                        of similar effect are excluded from the amounts
                        disclosed in the Asset Classification, other



                                       12
<PAGE>   20

                        than amounts of loans, extensions of credit or other
                        assets that were paid off or charged off by it or its
                        Subsidiaries before the date of this Agreement.

        3.2.5   INVESTMENTS. Schedule 8 lists all investments (except
                investments in securities issued by federal state or local
                government or any subdivision or agency thereof and investments
                in Subsidiaries) made by it or any of its Subsidiaries in an
                amount greater than $25,000 or which represent an ownership
                interest of more than 5% in any corporation, company,
                partnership, or other entity. All investments comply with all
                applicable laws and regulations.

        3.2.6   PROPERTIES.

                (a)     Except as disclosed or reserved against in its Financial
                        Statements or in Schedule 9, it and its Subsidiaries
                        have good and marketable title, free and clear of all
                        Liens (other than Liens for current taxes not yet
                        delinquent or pledges to secure deposits) to all of the
                        properties and assets, tangible or intangible, reflected
                        in its Reports as being owned or leased by it or its
                        Subsidiaries as of the date of this Agreement.

                (b)     To the knowledge of its Executive Officers, all
                        buildings and all fixtures, equipment and other property
                        and assets that are material to its business on a
                        consolidated basis and are held under leases or
                        subleases by it or its Subsidiaries are held under valid
                        leases or subleases, enforceable in accordance with
                        their respective terms (except as may be limited by
                        applicable bankruptcy, insolvency, reorganization,
                        moratorium or other laws affecting creditors' rights
                        generally or by general equity principles).

                (c)     Schedule 10 lists all its and its Subsidiaries' existing
                        branches and offices and all new branches or offices it
                        or any of its Subsidiaries' has applied to establish or
                        purchase, along with the cost to establish or purchase
                        those branches.

                (d)     Mountain West has provided to Glacier copies of existing
                        title policies held in its files, and no exceptions,
                        reservations, or encumbrances have arisen or been
                        created since the date of issuance of those policies.

        3.2.7   ANTI-TAKEOVER PROVISIONS. It and each of its Subsidiaries have
                taken all necessary action to exempt the Transaction and this
                Agreement from (a) all applicable Idaho State law anti-takeover
                provisions, if any, and (b) any takeover-related provisions of
                its articles of incorporation or bylaws.

        3.2.8   COMPLIANCE WITH LAWS. Except as disclosed in Schedule 11, it and
                each of its Subsidiaries:

                (a)     are in compliance, in the conduct of their businesses,
                        with all applicable federal, state, local, and foreign
                        statutes, laws, regulations, ordinances, rules,
                        judgments, orders or decrees, including the Bank Secrecy
                        Act, the Truth in Lending Act, the Equal Credit
                        Opportunity Act, the Fair Housing Act, the Community
                        Reinvestment Act, the Home Mortgage Disclosure Act and
                        all applicable fair lending laws or other laws relating
                        to discrimination;

                (b)     have all permits, licenses, certificates of authority,
                        orders, and approvals of, and have made all filings,
                        applications, and registrations with, federal, state,
                        local, and foreign governmental or regulatory bodies
                        (including the Federal Reserve, FDIC and OTS) that



                                       13
<PAGE>   21

                        are required in order to permit them to carry on their
                        businesses as they are presently conducted;

                (c)     have received since January 1, 1996, no notification or
                        communication from any Governmental Entity (including
                        any bank, insurance and securities regulatory
                        authorities) or its staff (1) asserting a failure to
                        comply with any of the statutes, regulations or
                        ordinances that such Governmental Entity enforces, (2)
                        threatening to revoke any license, franchise, permit or
                        governmental authorization, or (3) threatening or
                        contemplating revocation or limitation of, or that would
                        have the effect of revoking or limiting, FDIC deposit
                        insurance (nor, to the knowledge of its Executive
                        Officers, do any grounds for any of the foregoing
                        exist); and

                (d)     are not required to notify any federal banking agency
                        before adding directors to its board of directors or
                        employing senior executives.

        3.2.9   LITIGATION. Except as disclosed in its Financial Statements or
                in Schedule 12, before the date of this Agreement:

                (a)     no criminal or administrative investigations or
                        hearings, before or by any Governmental Entity, or
                        civil, criminal or administrative actions, suits, claims
                        or proceedings, before or by any person (including any
                        Governmental Entity) are pending or, to the knowledge of
                        its Executive Officers, threatened, against it or any of
                        its Subsidiaries (including under the Truth in Lending
                        Act, the Equal Credit Opportunity Act, the Fair Housing
                        Act, the Community Reinvestment Act, the Home Mortgage
                        Disclosure Act, or any other fair lending law or other
                        law relating to discrimination); and

                (b)     neither it nor any of its Subsidiaries (nor any officer,
                        director, controlling person or property of it or any of
                        its Subsidiaries) is a party to or is subject to any
                        order, decree, agreement, memorandum of understanding or
                        similar arrangement with, or a commitment letter or
                        similar submission to, any Governmental Entity charged
                        with the supervision or regulation of depository
                        institutions or engaged in the insurance of deposits
                        (including the FDIC) or the supervision or regulation of
                        it or of its Subsidiaries, and neither it nor any of its
                        Subsidiaries has been advised by any such Governmental
                        Entity that such Governmental Entity is contemplating
                        issuing or requesting (or is considering the
                        appropriateness of issuing or requesting) any such
                        order, decree, agreement, memorandum of understanding,
                        commitment letter or similar submission.

        3.2.10  TAXES. For purposes of this Subsection 3.2.10, "Tax" includes
                any tax or similar governmental charge, impost, or levy
                (including income taxes, franchise taxes, transfer taxes or
                fees, stamp taxes, sales taxes, use taxes, excise taxes, ad
                valorem taxes, withholding taxes, worker's compensation, payroll
                taxes, unemployment insurance, social security, minimum taxes,
                or windfall profits taxes), together with any
                related liabilities, penalties, fines, additions to tax, or
                interest, imposed by the United States or any state, county,
                provincial, local or foreign government or subdivision or agency
                of the United States.

                (a)     All federal, state and local Tax returns, including all
                        information returns, it and its Subsidiaries are
                        required to file have been timely filed or requests for
                        extensions have been timely filed. If any extensions
                        were filed, they have been or will be granted by Closing
                        and will not have expired. All filed returns are
                        complete and accurate in all material respects.



                                       14
<PAGE>   22

                (b)     Except as disclosed in its Financial Statements:

                        (1)     all taxes attributable to it or any of its
                                Subsidiaries that are or were due or payable
                                (without regard to whether such taxes have been
                                assessed) have been paid in full or have been
                                adequately provided for in its Financial
                                Statements in accordance with GAAP;

                        (2)     adequate provision in accordance with GAAP has
                                been made in its Financial Statements relating
                                to all Taxes for the periods covered by such
                                Financial Statements that were not yet due and
                                payable as of the date of this Agreement,
                                regardless of whether the liability for such
                                Taxes is disputed;

                        (3)     as of the date of this Agreement and except as
                                disclosed in its Financial Statements, there is
                                no outstanding audit examination, deficiency,
                                refund, litigation or outstanding waiver or
                                agreement extending the applicable statute of
                                limitations for the assessment or collection of
                                any Taxes for any period with respect to any
                                Taxes of it or its Subsidiaries;

                        (4)     all Taxes with respect to completed and settled
                                examinations or concluded litigation relating to
                                it or any of its Subsidiaries have been paid in
                                full or have been recorded on its Financial
                                Statements (in accordance with GAAP);

                        (5)     neither it nor any of its Subsidiaries is a
                                party to a Tax sharing or similar agreement or
                                any agreement under which it or any of its
                                Subsidiaries has indemnified any party (other
                                than it or one of its Subsidiaries) with respect
                                to Taxes; and

                        (6)     the proper and accurate amounts have been
                                withheld from all employees (and timely paid to
                                the appropriate Governmental Entity or set aside
                                in an account for these purposes) for all
                                periods through the Effective Date in compliance
                                with all Tax withholding provisions of
                                applicable federal, state, local and foreign
                                laws (including income, social security and
                                employment tax withholding for all types of
                                compensation).

        3.2.11  INSURANCE. It and each of its Subsidiaries has taken all
                requisite action (including the making of claims and the giving
                of notices) under its directors' and officers' liability
                insurance policy or policies in order to preserve all rights
                under such policies with respect to all matters known to it
                (other than matters arising in connection with, and the
                transactions contemplated by, this Agreement). Schedule 13 lists
                all directors' and officers' liability insurance policies and
                other insurance policies maintained by it or its Subsidiaries.

        3.2.12  LABOR MATTERS. Neither it nor any of its Subsidiaries is a party
                to, or is bound by, any collective bargaining agreement,
                contract or other agreement or understanding with any labor
                union or labor organization. Neither it nor any of its
                Subsidiaries is the subject of any proceeding: (1) asserting
                that it or any of its Subsidiaries has committed an unfair labor
                practice or (2) seeking to compel it or any of its Subsidiaries
                to bargain with any labor organization as to wages or conditions
                of employment. No strike involving it or any of its Subsidiaries
                is pending or, to the knowledge of its Executive Officers,
                threatened. Its Executive Officers are not aware of any activity
                involving its or any of its Subsidiaries' employees seeking to
                certify a collective bargaining unit or engaging in any other
                organizational activity.



                                       15
<PAGE>   23

        3.2.13  YEAR 2000 COMPLIANCE. It and its Subsidiaries are Year 2000
                Compliant and have received "Satisfactory" ratings by the
                appropriate banking regulatory authorities. For purposes of this
                Agreement, "Year 2000 Compliant" means that Mountain West's
                Information Technology is designed to be used prior to, during,
                and after the calendar Year 2000 A.D., and the Information
                Technology used during each such time period will accurately
                receive, provide and process date/time data (including, but not
                limited to, calculating, comparing and sequencing) from, into
                and between the twentieth and twenty-first centuries, including
                the years 1999 and 2000, and leap year calculations and will not
                malfunction, cease to function, or provide invalid or incorrect
                results as a result of date/time data, to the extent that other
                Information Technology, used in combination with the Information
                Technology being acquired, properly exchanges date/time data
                with it. For purposes of this Agreement, "Information
                Technology" includes computer software, computer firmware,
                computer hardware (whether general or specific purpose), and
                other similar or related automated or computerized items that
                are used or relied on by Mountain West or any if its
                Subsidiaries in the conduct of their businesses.

        3.2.14  EMPLOYEE BENEFITS.

                (a)     For purposes of this Agreement, "Plan" or "Plans",
                        individually or collectively, means any "employee
                        benefit plan," as defined in Section 3(3) of the
                        Employee Retirement Income Security Act of 1974,
                        ("ERISA"), as amended, maintained by Mountain West or
                        any of its Subsidiaries, as the case may be. Mountain
                        West and its Subsidiaries are not now nor have they ever
                        been contributing employers to or sponsors of a
                        multi-employer plan or a single employer plan subject to
                        Title IV of ERISA.

                (b)     Schedule 14 sets forth a list, as of the date of this
                        Agreement, of (1) all Plans, stock purchase plans,
                        restricted stock and stock option plans, and other
                        deferred compensation arrangements, (2) all other
                        material employee benefit plans that cover employees or
                        former employees of it and its Subsidiaries (its
                        "Compensation Plans"). True and complete copies of the
                        Compensation Plans (and, as applicable, copies of
                        summary plan descriptions, annual reports on Form 5500,
                        actuarial reports and reports under Financial Accounting
                        Standards Board Statement No. 106 relating to such
                        Compensation Plans) covering current or former employees
                        or directors of it or its Subsidiaries (its
                        "Employees"), including Plans and related amendments,
                        have been made available to Glacier.

                (c)     All Plans (other than "multi-employer plans" within the
                        meaning of ERISA Sections 3(37) or 4001(a)(3)), to the
                        extent subject to ERISA, are in substantial compliance
                        with ERISA. Each Plan, that is an "employee pension
                        benefit plan" within the meaning of ERISA Section 3(2)
                        ("Pension Plan") and that is intended to be qualified
                        under IRC Section 401(a), has received a favorable
                        determination letter from the Internal Revenue Service,
                        and it is not aware of any circumstances likely to
                        result in revocation of any such favorable determination
                        letter. No litigation relating to Plans is pending or,
                        to the knowledge of its Executive Officers, threatened.
                        Neither it nor any of its Subsidiaries has engaged in a
                        transaction with respect to any Plan that could subject
                        it or its Subsidiaries to a Tax or penalty imposed by
                        either IRC Section 4975 or ERISA Section 502(i).

                (d)     All material contributions it or any of its Subsidiaries
                        are or were required to make under the terms of any
                        Plans have been timely made or have been reflected in
                        its Financial Statements. No Plan of it or its
                        subsidiaries has an "accumulated funding deficiency"
                        (whether or not waived) within the meaning of IRC
                        Section 412 or ERISA Section 302.



                                       16
<PAGE>   24

                        Neither it nor any of its Subsidiaries has provided, or
                        is required to provide, security to any Pension Plan
                        under IRC Section 401(a)(29), IRC Section 412(f)(3), or
                        ERISA Sections 306, 307 or 4204.

                (e)     Except as disclosed in its Financial Statements, neither
                        it nor its Subsidiaries have any obligations for retiree
                        health and life benefits.

                (f)     No restrictions exist on the rights of it or its
                        Subsidiaries to amend or terminate any Plan without
                        incurring liability under the Plan in addition to normal
                        liabilities for benefits.

                (g)     Except as disclosed in its Financial Statements or as
                        provided in a Schedule to this Agreement, the
                        transactions contemplated by this Agreement and the
                        Stock Plans will not result in: (1) vesting,
                        acceleration, or increase of any amounts payable under
                        any Compensation Plan, (2) any material increase in
                        benefits under any Compensation Plan or (3) payment of
                        any severance or similar compensation under any
                        Compensation Plan.

        3.2.15  ENVIRONMENTAL MATTERS.

                (a)     For purposes of this Subsection 3.2.15, the following
                        definitions apply:

                        (1)     "Subject Property" with respect to a party means
                                (i) all real property at which the businesses of
                                it or its Subsidiaries have been conducted, and
                                any property where under any Environmental Law
                                it or any of its Subsidiaries is deemed to be
                                the owner or operator of the property; (ii) any
                                facility in which it or its Subsidiaries
                                participates in the management, including
                                participating in the management of the owner or
                                operator of the property; and (iii) all other
                                real property that, for purposes of any
                                Environmental Law, it or any of its Subsidiaries
                                otherwise could be deemed to be an owner or
                                operator of or as otherwise having control over.

                        (2)     "Environmental Laws" means any federal, state,
                                local or foreign law, regulation, agency policy,
                                order, decree, judgment, judicial opinion, or
                                any agreement with any Governmental Entity,
                                presently in effect or subsequently adopted
                                relating to: (i) the manufacture, generation,
                                transport, use, treatment, storage, recycling,
                                disposal, release, threatened release or
                                presence of Hazardous Substances, or (ii) the
                                preservation, restoration or protection of the
                                environment, natural resources or human health.

                        (3)     "Hazardous Substances" means any hazardous or
                                toxic substance, material or waste that is
                                regulated by any local governmental authority,
                                any state government or the United States
                                Government, including any material or substance
                                that is (a) defined as a "hazardous substance"
                                in 42 USC Section 9601(14), (b) defined as a
                                "pollutant or contaminant" in 42 USC Section
                                9604(a)(2), or (c) defined as a "hazardous
                                waste" in 42 USC Section 6903(5).

                (b)     It and each of its Subsidiaries and the Subject Property
                        are, and have been, in compliance with all applicable
                        Environmental Laws, and no circumstances exist that with
                        the passage of time or the giving of notice would be
                        reasonably likely to result in noncompliance with such
                        Environmental Laws.

                (c)     None of the following, and no reasonable basis for any
                        of the following, exists: pending or threatened claims,
                        actions, investigations, notices of non-compliance,
                        information



                                       17
<PAGE>   25

                        requests or notices of potential responsibility or
                        proceedings involving it or any of its Subsidiaries or
                        any Subject Property, relating to:

                        (1)     an asserted liability of it or any of its
                                Subsidiaries or any prior owner, occupier or
                                user of Subject Property under any applicable
                                Environmental Law or the terms and conditions of
                                any permit, license, authority, settlement,
                                agreement, decree or other obligation arising
                                under any applicable Environmental Law;

                        (2)     the handling, storage, use, transportation,
                                removal or disposal of Hazardous Substances;

                        (3)     the actual or threatened discharge, release or
                                emission of Hazardous Substances from, on or
                                under or within Subject Property into the air,
                                water, surface water, ground water, land surface
                                or subsurface strata; or

                        (4)     personal injuries or damage to property related
                                to or arising out of exposure to Hazardous
                                Substances.

                (d)     No storage tanks underground or otherwise are present on
                        the Subject Property or, if present, none of such tanks
                        are leaking and each of them is in full compliance with
                        all applicable Environmental Laws. With respect to any
                        Subject Property, it and its Subsidiaries do not own,
                        possess or control any PCBs, PCB-contaminated fluids,
                        wastes or equipment, or any material amount of asbestos
                        or asbestos-containing material. No Hazardous Substances
                        have been used, handled, stored, discharged, released or
                        emitted, or are threatened to be discharged, released or
                        emitted, at or on any Subject Property, except for those
                        types and quantities of Hazardous Substances typically
                        used in an office environment and that have not created
                        conditions requiring remediation under any applicable
                        Environmental Law.

                (e)     Except for the investigation or monitoring by the
                        Environmental Protection Agency or similar state
                        agencies in the ordinary course, no part of the Subject
                        Property has been or is scheduled for investigation or
                        monitoring under any applicable Environmental Law.

3.3     EXCEPTIONS TO REPRESENTATIONS.

        3.3.1   DISCLOSURE OF EXCEPTIONS. Each exception set forth in a Schedule
                is disclosed only for purposes of the representations referenced
                in that exception; but the following conditions apply:

                (a)     no exception is required to be set forth in a Schedule
                        if its absence would not result in the related
                        representation being found untrue or incorrect under the
                        standard established by Subsection 3.3.2; and

                (b)     the mere inclusion of an exception in a Schedule is not
                        an admission by a party that such exception represents a
                        material fact, material set of facts, or material event
                        or would result in a Material Adverse Effect with
                        respect to that party.

        3.3.2   NATURE OF EXCEPTIONS. No representation contained in Subsections
                3.1 or 3.2 will be found untrue or incorrect and no party to
                this Agreement will have breached a representation due to the
                following: the existence of any fact, set of facts, or event, if
                the fact or event individually or taken together with other
                facts or events would not, or, in the case of Subsection 3.2.9,
                is not reasonably likely to, have a Material Adverse Effect with
                respect to such party.



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<PAGE>   26

                                         SECTION 4

                                 CONDUCT AND TRANSACTIONS
                                      BEFORE CLOSING

4.1     CONDUCT OF MOUNTAIN WEST'S BUSINESS BEFORE CLOSING. Before Closing,
        Mountain West promises as follows:

        4.1.1   AVAILABILITY OF MOUNTAIN WEST'S BOOKS, RECORDS AND PROPERTIES.

                (a)     Mountain West will make its, and cause its Subsidiaries
                        to make their, books, records, properties, contracts and
                        documents available at all reasonable times to Glacier
                        and its counsel, accountants and other representatives.
                        These items will be open for inspection, audit and
                        direct verification of: (1) loan or deposit balances,
                        (2) collateral receipts and (3) any other transactions
                        or documentation Glacier may find reasonably relevant to
                        the Transaction. Mountain West will, and will cause its
                        Subsidiaries to, cooperate fully in any such inspection,
                        audit, or direct verification procedures, and Mountain
                        West will, and will cause its Subsidiaries to, make
                        available all information reasonably required by or on
                        behalf of Glacier.

                (b)     At Glacier's request, Mountain West will request any
                        third parties involved in the preparation or review of
                        (1) Mountain West Financial Statements, (2) Subsequent
                        Mountain West Financial Statements, or (3) any audits of
                        Mountain West's operations, loan portfolios or other
                        assets, to disclose to Glacier the work papers or any
                        similar materials related to these items.

        4.1.2   ORDINARY AND USUAL COURSE. Mountain West will, and will cause
                its Subsidiaries to, conduct business only in the ordinary and
                usual course and, without the prior written consent of Glacier,
                will not, and will not allow its Subsidiaries to, do any of the
                following:

                (a)     effect any stock split or other recapitalization with
                        respect to Mountain West Common Stock or the capital
                        stock of a Mountain West Subsidiary, or issue, pledge,
                        redeem, or encumber in any way any shares of Mountain
                        West's or a Mountain West Subsidiary's capital stock,
                        except shares issued pursuant to the exercise of
                        Mountain West Stock Options; or grant any option or
                        other right to shares of Mountain West's or a Mountain
                        West Subsidiary's capital stock;

                (b)     declare or pay any dividend, or make any other
                        distribution, either directly or indirectly, with
                        respect to Mountain West Common Stock or the capital
                        stock of any Mountain West Subsidiary;

                (c)     acquire, sell, transfer, assign, encumber or otherwise
                        dispose of assets or make any commitment with respect to
                        its assets other than in the ordinary and usual course
                        of business;

                (d)     solicit or accept deposit accounts of a different type
                        from accounts previously accepted by it or at rates
                        materially in excess of rates previously paid by it,
                        except to reflect changes in prevailing interest rates,
                        or incur any indebtedness greater than $25,000 (except
                        for borrowings from the Federal Home Loan Bank in the
                        ordinary course of business and consistent with past
                        practices);



                                       19
<PAGE>   27

                (e)     acquire an ownership interest or a leasehold interest in
                        any Property or any other real property, whether by
                        foreclosure or otherwise, without: (1) making an
                        appropriate environmental evaluation in advance of
                        obtaining the interest and providing the evaluation to
                        Glacier and (2) (without giving effect to the
                        introductory paragraph of this Subsection 4.1.2)
                        providing Glacier with prompt written notice as required
                        by Subsection 4.8.

                (f)     subject to the exercise of its board of directors'
                        fiduciary duties and on the advice of counsel, enter
                        into or recommend the adoption by Mountain West's
                        stockholders of any agreement involving a possible
                        merger or other business combination or asset sale by
                        Mountain West not involving the Transaction;

                (g)     enter into, renew, or terminate any contracts (including
                        real property leases and data or item processing
                        agreements) with or for a term of one-year or more,
                        except for its contracts of deposit and agreements to
                        lend money not otherwise restricted under this Agreement
                        and (1) entered into in the ordinary course of business,
                        (2) consistent with past practices, and (3) providing
                        for not less (in the case of loans) or more (in the case
                        of deposits) than prevailing market rates of interest;

                (h)     enter into or amend any contract (other than contracts
                        for deposits or agreements to lend money not otherwise
                        restricted by this Agreement) calling for a payment by
                        it of more than $25,000, unless the contract may be
                        terminated without cause or penalty upon 30 days notice
                        or less;

                (i)     enter into any personal services contract with any
                        person or firm, except contracts, agreements, or
                        arrangements for legal, accounting, investment advisory,
                        or tax services entered into directly to facilitate the
                        Transaction;

                (j)     (1) sell any securities, whether held for investment or
                        sale, other than in the ordinary course of business or
                        sell any securities, whether held for investment or
                        sale, even in the ordinary course of business, if the
                        aggregate gain realized from all sales after the date of
                        this Agreement would be more than $60,000 or (2)
                        transfer any investment securities between portfolios of
                        securities available for sale and portfolios of
                        securities to be held to maturity;

                (k)     amend its articles of incorporation, bylaws, or other
                        formation agreements, or convert its charter or form of
                        entity;

                (l)     implement or adopt any material changes in its
                        operations, policies, or procedures, including loan loss
                        reserve policies, unless the changes are requested by
                        Glacier or are necessary or advisable, on the advice of
                        legal counsel, to comply with applicable laws,
                        regulations, or regulatory policies;

                (m)     implement or adopt any change in its accounting
                        principles, practices or methods, other than as may be
                        required (1) by GAAP, (2) for tax purposes, or (3) to
                        take advantage of any beneficial tax or accounting
                        methods;

                (n)     other than in accordance with binding commitments
                        existing on the date of this Agreement, make any capital
                        expenditures in excess of $10,000 per project or related



                                       20
<PAGE>   28

                        series of projects or $25,000 in the aggregate, except
                        for expenses reasonably related to completion of the
                        Transaction, which expenses may not exceed $60,000; or

                (o)     enter into any other transaction or make any expenditure
                        other than in the ordinary and usual course of its
                        business and made or entered into in a manner consistent
                        with its well-established practices or as required by
                        this Agreement.

        4.1.3   CONDUCT REGARDING REPRESENTATIONS. Mountain West will not do or
                cause to be done anything that would cause any representation in
                Subsection 3.1 or 3.2 to be untrue at Closing, except as
                otherwise contemplated or required by this Agreement or
                consented to in writing by Glacier.

        4.1.4   MAINTENANCE OF PROPERTIES. Mountain West will maintain its
                properties and equipment (and related insurance or its
                equivalent) in accordance with good business practice.

        4.1.5   PRESERVATION OF BUSINESS ORGANIZATION. Mountain West will use
                all reasonable efforts to:

                (a)     preserve its business organization;

                (b)     retain the services of present management; and

                (c)     preserve the goodwill of suppliers, customers and others
                        with whom it has business relationships.

        4.1.6   SENIOR MANAGEMENT. Except for (1) changes consistent with past
                practice and (2) the hiring of a commercial loan officer in
                Boise, Mountain West will not make any change, including hiring
                of replacements, with respect to present management personnel
                having the rank of vice-president or higher.

        4.1.7   COMPENSATION AND EMPLOYMENT AGREEMENTS. Mountain West will not
                permit any increase in the current or deferred compensation
                payable or to become payable by Mountain West to any of its
                directors, officers, employees, agents, or consultants other
                than normal increments in compensation in accordance with
                Mountain West's past practices with respect to the timing and
                amounts of such increments. Except as contemplated in this
                Agreement, Mountain West will not commit to, execute or deliver
                any employment agreement with any party not terminable upon two
                weeks' notice and without expense.

        4.1.8   UPDATE OF FINANCIAL STATEMENTS. Mountain West will promptly
                deliver its Financial Statements to Glacier. Mountain West will
                deliver Subsequent Mountain West Financial Statements to Glacier
                by the earlier of: (1) 5 days after Mountain West has prepared
                and issued them or (2) 60 days after year-end for year-end
                statements and 30 days after the end of the quarter for
                quarterly statements. The Subsequent Mountain West Financial
                Statements:

                (a)     will be prepared from the books and records of Mountain
                        West;

                (b)     will present fairly the financial position and operating
                        results of Mountain West at the times indicated and for
                        the periods covered;

                (c)     will be prepared in accordance with GAAP (except for the
                        absence of notes) and with the regulations promulgated
                        by applicable regulatory authorities, to the extent then
                        applicable, subject to normal year-end adjustments; and



                                       21
<PAGE>   29

                (d)     will reflect all Mountain West's liabilities, contingent
                        or otherwise, on the respective dates and for the
                        respective periods covered, except for liabilities: (1)
                        not required to be so reflected in accordance with GAAP
                        or (2) not significant in amount.

        4.1.9   NO SOLICITATION. Neither Mountain West nor any of its officers
                or directors, directly or indirectly, will solicit, encourage,
                entertain, or facilitate any other proposals or inquiries for an
                acquisition of the shares or assets of Mountain West or its
                Subsidiaries or enter into discussions concerning any such
                acquisition, except as otherwise required to comply with the
                fiduciary responsibilities of Mountain West's board of
                directors. No such party will make available to any person not
                affiliated with Mountain West or Glacier any information about
                its business or organization that is not either routinely made
                available to the public generally or required by law.

        4.1.10  TITLE POLICIES. No later than 30 days after the execution of
                this Agreement, Mountain West will provide Glacier with title
                reports issued by a title insurance company reasonably
                satisfactory to Glacier. These title reports must show
                unencumbered fee simple title or vendee's interest to all real
                Property owned by Mountain West or any of its Subsidiaries and
                unencumbered leasehold interests in all real Property leased by
                Mountain West or any of its Subsidiaries, and these title
                reports may contain only such exceptions, reservations, and
                encumbrances as may be consented to in writing by Glacier, which
                consent Glacier may not unreasonably withhold. At Closing,
                Mountain West will provide Glacier with update endorsements,
                dated as of the Effective Date, to the title policies for each
                Property owned by it or any of its Subsidiaries. For purposes of
                this Agreement, "Property" includes any property that Mountain
                West or any of its Subsidiaries owns or leases, other than other
                real estate owned.

        4.1.11  REVIEW OF LOANS. Mountain West will permit Glacier to conduct an
                examination of Mountain West's loans to determine credit quality
                and the adequacy of Mountain West's allowance for loan losses.
                Glacier will have continued access to Mountain West's loans
                through Closing to update the examination. At Glacier's
                reasonable request, Mountain West will provide Glacier with
                current reports updating the information set forth in Schedule
                7.

4.2     REGISTRATION STATEMENT.

        4.2.1   PREPARATION OF REGISTRATION STATEMENT.

                (a)     A Registration Statement on Form S-4 ("Registration
                        Statement") will be filed by Glacier with the SEC under
                        the Securities Act for registration of the Glacier
                        Shares, and the parties will prepare a related
                        prospectus/proxy statement ("Prospectus/Proxy
                        Statement") to be mailed together with any amendments
                        and supplements to Mountain West's stockholders.

                (b)     The parties will cooperate with each other in preparing
                        the Registration Statement and Prospectus/Proxy
                        Statement, and will use their best efforts to: (1) file
                        the Registration Statement with the SEC within 60 days
                        following the date on which this Agreement is executed,
                        and (2) obtain the clearance of the SEC, any appropriate
                        state securities regulators and any other required
                        regulatory approvals, to issue the Prospectus/Proxy
                        Statement.

                (c)     Nothing will be included in the Registration Statement
                        or the Prospectus/Proxy Statement or any proxy
                        solicitation materials with respect to any party to this
                        Agreement unless approved by that party, which approval
                        will not be unreasonably withheld.



                                       22
<PAGE>   30
                (d)     Glacier will pay all costs associated with the
                        preparation by Glacier's counsel and the filing of the
                        Registration Statement. Mountain West will pay all costs
                        associated with the review and preparation by Mountain
                        West's counsel of the Registration Statement and the
                        Prospectus/Proxy. Mountain West will pay the costs
                        associated with the printing and mailing of the
                        Prospectus/Proxy Statement to its stockholders and any
                        other direct costs incurred by it in connection with the
                        Prospectus/Proxy Statement.

        4.2.2   SUBMISSION TO STOCKHOLDERS.

                (a)     Glacier and Mountain West will submit the
                        Prospectus/Proxy Statement to, and will use their best
                        efforts in good faith to obtain the prompt approval of
                        the Prospectus/Proxy Statement by, all applicable
                        regulatory authorities. The parties will provide each
                        other with copies of such submissions for review.

                (b)     Mountain West will promptly take the actions necessary
                        in accordance with applicable law and its Articles of
                        Incorporation and Bylaws to convene a stockholders'
                        meeting to consider the approval of this Agreement and
                        to authorize the transactions contemplated by this
                        Agreement. This stockholders' meeting will be held on
                        the earliest practical date after the date the
                        Prospectus/Proxy Statement may first be sent to Mountain
                        West's stockholders without objection by applicable
                        governmental authorities; but Mountain West will have at
                        least 20 calendar days to solicit proxies. Except as
                        otherwise required to comply with the fiduciary
                        responsibilities of its board of directors, Mountain
                        West's board of directors and officers will recommend
                        approval of the Transaction to Mountain West's
                        stockholders.

4.3     ACCOUNTING TREATMENT.

        4.3.1   POOLING OF INTERESTS. The parties intend the Merger to be
                treated as a "pooling of interests" for accounting purposes.
                From the date of this Agreement through the Effective Date,
                neither Glacier nor Mountain West nor any of their respective
                Subsidiaries or other affiliates (a) will knowingly take any
                action or enter into any contract, agreement, commitment or
                arrangement that would jeopardize the treatment of the Merger as
                a "pooling of interests;" or (b) will knowingly fail to take any
                action that would preserve the treatment of the Merger as a
                "pooling of interests." No action or omission by either party
                will constitute a breach of this Subsection 4.3.1 if the action
                is permitted or required under this Agreement or is made with
                the other party's written consent, or as required by applicable
                laws or regulations.

        4.3.2   AFFILIATE LIST. Certain persons may be deemed "affiliates" of
                Mountain West under Securities Act Rule 145, the SEC's
                Accounting Series Releases ("ASR") 130 and 135, or other rules
                and releases related to "pooling of interests" accounting
                treatment. Within thirty days following the date this Agreement
                is signed, Mountain West will deliver to Glacier, after
                consultation with legal counsel, a list of names and addresses
                of Mountain West's "affiliates" with respect to the Transaction
                within the meaning of Rule 145 or ASR 130 and 135. By the
                Effective Date, Mountain West will deliver, or cause to be
                delivered, to Glacier a letter from each of these "affiliates,"
                and any additional person who becomes an "affiliate" before the
                Effective Date and after the date of the list, dated as of the
                date of its delivery and in the form attached as Exhibit C.

        4.3.3   RESTRICTIVE LEGENDS. Glacier will place a restrictive legend on
                all certificates representing Glacier Shares to be received by
                an "affiliate," so as to preclude their transfer or disposition
                in violation of the affiliate letters. Glacier will also
                instruct its transfer agent not to permit the transfer of those
                shares, and to take any other steps reasonably necessary to
                ensure compliance



                                       23
<PAGE>   31

                with the Securities Act Rule 145 or the SEC's ASR 130 and 135 or
                other rules and releases related to "pooling of interests"
                accounting treatment.

        4.3.4   RETENTION OF CERTIFICATES. Except as otherwise permitted in
                Exhibit A, by a date at least 30 days before the Effective Date,
                all stock certificates evidencing ownership of Mountain West
                Common Stock by "affiliates" will be delivered to Mountain West.
                Mountain West (before the Effective Date) and Glacier (after the
                Effective Date) will retain those certificates, and subsequently
                the certificates representing Glacier shares for which they are
                exchanged, until financial results covering at least 30 days of
                combined operations for Glacier following the Effective Date
                have been published, at which time the certificates will be
                released.

4.4     SUBMISSION TO REGULATORY AUTHORITIES. Representatives of Glacier, at
        Glacier's expense, will prepare and file with applicable regulatory
        agencies, applications for approvals, waivers or other actions their
        counsel finds necessary or desirable in order to consummate the
        Transaction. Glacier will provide copies of these applications for
        Mountain West's review. These applications and filings are expected to
        include:

        (a)     any necessary applications to the Federal Reserve and the FDIC;
                and

        (b)     any filings required under the Idaho Bank Act;

4.5     ANNOUNCEMENTS. The parties will cooperate and consult with each other in
        the development and distribution of all news releases and other public
        information disclosures with respect to this Agreement or the
        Transaction, unless otherwise required by law.

4.6     CONSENTS. Glacier and Mountain West will use their best efforts to
        obtain the consent or approval of any person, organization or other
        entity whose consent or approval is required in order to consummate the
        Transaction.

4.7     FURTHER ACTIONS. Glacier and Mountain West, respectively, in the name
        and on behalf of those respective parties, will use their best efforts
        in good faith to make all such arrangements, do or cause to be done all
        such acts and things, and execute and deliver all such certificates and
        other instruments and documents as may be reasonably necessary or
        appropriate in order to consummate the Transaction as promptly as
        practicable.

4.8     NOTICE. Mountain West will provide Glacier with prompt written notice of
        the following:

        (a)     any events, individually or in the aggregate, that could have a
                Material Adverse Effect with respect to Mountain West;

        (b)     the commencement of any proceeding against Mountain West, or any
                of its Subsidiaries or affiliates, by or before any court or
                governmental agency that, individually or in the aggregate,
                might have a Material Adverse Effect with respect to Mountain
                West; or

        (c)     any acquisition of an ownership or leasehold interest in real
                property, other than an acquisition in good faith of real
                property to satisfy a debt previously contracted for.

4.9     CONFIDENTIALITY. Glacier and Mountain West each will hold in confidence
        all nonpublic information obtained from the other in connection with the
        Transaction, other than information that: (1) is required by law to be
        disclosed; (2) is otherwise available on a nonconfidential basis; (3)
        has become public without fault of the disclosing party; or (4) is
        necessary to the defense of one of the parties in a legal or
        administrative action brought against that party by the other party. If
        the Transaction is not completed,




                                       24
<PAGE>   32

        Glacier and Mountain West will: (1) each return to the others all
        confidential documents obtained from them and (2) not use any nonpublic
        information obtained under this Agreement or in connection with the
        Transaction.

4.10    UPDATE OF FINANCIAL STATEMENTS. Glacier will promptly deliver its
        Financial Statements to Mountain West. Glacier will deliver Subsequent
        Glacier Financial Statements to Mountain West by the earlier of: (1) 5
        days after Glacier prepares and issues them or (2) 60 days after
        year-end for year-end statements and 30 days after the end of the
        quarter for quarterly statements. The Subsequent Glacier Financial
        Statements will:

        (a)     be prepared from the books and records of Glacier;

        (b)     present fairly the financial position and operating results of
                Glacier at the times indicated and for the periods covered;

        (c)     be prepared in accordance with GAAP (except for the absence of
                notes) and with the regulations promulgated by applicable
                regulatory authorities, to the extent then applicable, subject
                to normal year-end adjustments; and

        (d)     reflect all liabilities, contingent or otherwise, of Glacier on
                the respective dates and for the respective periods covered,
                except for liabilities not required to be so reflected in
                accordance with GAAP or not significant in amount.

4.11    AVAILABILITY OF GLACIER'S BOOKS, RECORDS AND PROPERTIES. Glacier will
        make available to Mountain West true and correct copies of its
        Certificate of Incorporation and Bylaws. At Mountain West's reasonable
        request, Glacier will also provide Mountain West with copies of: (1)
        reports filed with the SEC or banking regulators, (2) Glacier's stock
        option plans, and (3) any other information that the parties agree upon.

                                    SECTION 5
                            APPROVALS AND CONDITIONS

5.1     REQUIRED APPROVALS. The obligations of the parties to this Agreement are
        subject to the approval of the Agreement and the Transaction by all
        appropriate regulatory agencies having jurisdiction with respect to the
        Transaction.

5.2     CONDITIONS TO GLACIER'S OBLIGATIONS. All Glacier's obligations under
        this Agreement are subject to satisfaction of the following conditions
        at or before Closing:

        5.2.1   REPRESENTATIONS. Mountain West's representations in this
                Agreement and in any certificate or other instrument delivered
                in connection with this Agreement are true and correct in all
                material respects at Closing (except to the extent that they
                expressly relate to an earlier date, in which case they are true
                in all material respects as of that earlier date). These
                representations have the same force and effect as if they had
                been made at Closing. Mountain West has delivered to Glacier its
                certificate, executed by a duly authorized officer of Mountain
                West and dated as of Closing, stating that these representations
                comply with this Subsection 5.2.1.

        5.2.2   COMPLIANCE. Mountain West has performed and complied with all
                material terms, covenants and conditions of this Agreement.
                Mountain West has delivered to Glacier its certificate, executed
                by a duly authorized officer of Mountain West and dated as of
                Closing, stating that Mountain West is in compliance with this
                Subsection 5.2.2.



                                       25
<PAGE>   33

        5.2.3   EQUITY CAPITAL REQUIREMENT. The Tangible Equity Capital,
                determined in accordance with GAAP, of Mountain West as of the
                Effective Date is at least $6.3 million. Mountain West's
                certificate referred to in Subsection 5.2.2 must confirm that
                this condition is satisfied. "Tangible Equity Capital" means
                common stock, paid in capital, retained earnings, and minus
                goodwill and any other intangible assets, without giving effect
                to any impact from gains or losses on available for sale
                securities.

        5.2.4   TRANSACTION FEES. Mountain West's Transaction Fees have not
                exceeded $60,000. "Transaction Fees" means all costs and
                expenses incurred by Mountain West or owed or paid by Mountain
                West to third parties in connection with the preparation,
                negotiation and execution of this Agreement and related
                documents and the consummation of the Transaction, including
                expenses incurred by Mountain West in connection with obtaining
                approvals for the Transaction from regulators and stockholders,
                not including exercise of options or any expenses incurred under
                Subsection 4.1.10.

        5.2.5   TRANSACTION FEES STATEMENTS. Mountain West has delivered to
                Glacier a statement, in a form reasonably satisfactory to
                Glacier, from each third party to whom Mountain West has paid or
                owes Transaction Fees. Each statement must set forth the total
                costs and expenses paid or owing to the third party in
                connection with the Transaction's consummation. Mountain West
                has delivered to Glacier its certificate, executed by a duly
                authorized officer of Mountain West and dated as of Closing,
                stating the total Transaction Fees incurred by Mountain West and
                certifying that Mountain West is in compliance with Subsection
                5.2.4 and this Subsection 5.2.5.

        5.2.6   NO MATERIAL ADVERSE EFFECT. No damage, destruction, or loss
                (whether or not covered by insurance) or other event or sequence
                of events has occurred which, individually or in the aggregate,
                has had or potentially may have a Material Adverse Effect with
                respect to Mountain West. Mountain West's certificate referred
                to in Subsection 5.2.1 states that the conditions identified in
                this Subsection 5.2.6 are satisfied.

        5.2.7   FINANCIAL CONDITION. The following are true, and Mountain West's
                certificate referred to in Subsection 5.2.1 confirms the truth
                of the following:

                (a)     Mountain West's allowance for possible loan and lease
                        losses at Closing was and is adequate to absorb the
                        anticipated loan and lease losses (taking into account
                        any recommendations made by Mountain West's certified
                        public accountants);

                (b)     the reserves set aside for the contingent liabilities
                        reflected in the Subsequent Mountain West Financial
                        Statements are adequate to absorb all reasonably
                        anticipated losses; and

                (c)     Mountain West's deposits at Closing, excluding brokered
                        deposits and jumbo certificates of deposit, total at
                        least $69 million.

        5.2.8   NO CHANGE IN LOAN REVIEW. Mountain West has provided to Glacier
                the reports reasonably requested by Glacier under Subsection
                4.1.11, and neither these reports nor any examinations conducted
                by Glacier under Subsection 4.1.11 reveal a material adverse
                change in either: (1) the information set forth in Schedule 7 or
                (2) information revealed during Glacier's previous examinations
                of the Mountain West's loans.

        5.2.9   NO GOVERNMENTAL PROCEEDINGS. No action or proceeding has been
                commenced or threatened by any governmental agency to restrain
                or prohibit or invalidate the Transaction.



                                       26
<PAGE>   34

        5.2.10  APPROVAL BY COUNSEL. All actions, proceedings, instruments, and
                documents required in connection with this Agreement, the
                Transaction, and all other related legal matters have been
                approved by Glacier's counsel.

        5.2.11  RECEIPT OF TITLE POLICY. Glacier has received all title
                insurance reports and update endorsements required under
                Subsection 4.1.10.

        5.2.12  CORPORATE AND STOCKHOLDER ACTION. Mountain West's board of
                directors and stockholders, respectively, have approved the
                Transaction.

        5.2.13  TAX OPINION. Glacier has, at Glacier's expense, obtained from
                Graham & Dunn, P.C. and delivered to Mountain West, an opinion
                addressed to Mountain West and in form and substance reasonably
                satisfactory to Mountain West and its counsel, to the effect
                that consummation of the Transaction will not result in a
                taxable event for Mountain West or Glacier, and otherwise will
                have each of the effects specified below:

                (a)     The Transaction will qualify as a reorganization within
                        the meaning of IRC Section 368(a)(1)(A).

                (b)     Under IRC Section 354(a)(i), Mountain West's
                        stockholders who, in accordance with Section 1, exchange
                        their Mountain West Common Stock shares solely for
                        Glacier Common Stock shares will not recognize gain or
                        loss on the exchange.

                (c)     Cash payments to Mountain West's stockholders in lieu of
                        a fractional share of Glacier Common Stock will be
                        treated as distributions in redemption of the fractional
                        share interest, subject to the limitations of IRC
                        Section 302.

        5.2.14  OPINION OF COUNSEL. Mountain West has obtained from Lukins &
                Annis, P.S., and delivered to Glacier an opinion of counsel,
                substantially in the form attached to this Agreement as Exhibit
                D.

        5.2.15  CASH PAID. The aggregate of the cash paid for fractional shares
                and Dissenting Shares to holders of Mountain West Common Stock
                under this Agreement and applicable law will not exceed 10% of
                the cash value of the Exchange Ratio, as it may be adjusted
                under this Agreement.

        5.2.16  AFFILIATE LETTERS. Glacier has received the affiliate list and
                letters specified in Subsection 4.3.2.

        5.2.17  REGISTRATION STATEMENT. The Registration Statement, as it may
                have been amended, required in connection with the Glacier
                Shares to be issued to stockholders under Subsection 1.6, and as
                described in Subsection 4.2, has become effective, and no stop
                order suspending the effectiveness of such Registration
                Statement has been issued or remains in effect, and no
                proceedings for that purpose have been initiated or threatened
                by the SEC the basis for which still exists.

        5.2.18  CONSENTS. Mountain West has obtained the consents as indicated
                in Schedule 6.

        5.2.19  FAIRNESS OPINIONS. Glacier has received from Columbia, updated
                fairness opinions (to be delivered by Mountain West to Glacier
                at Mountain West's expense), dated as of or immediately before
                Mountain West mails the Prospectus/Proxy Statement to its
                stockholders and immediately before Closing, to the effect that
                the financial terms of the Transaction are financially fair to
                Mountain West's stockholders. Glacier will provide Mountain
                West's investment advisor with any information reasonably
                requested for the purpose of issuing a fairness opinion.


                                       27
<PAGE>   35

        5.2.20  ACCOUNTING TREATMENT. It has been determined to Glacier's
                satisfaction that the Transaction will be treated for accounting
                purposes as a "pooling of interests" in accordance with APB
                Opinion No. 16, and Glacier has received a letter to this effect
                from KPMG Peat Marwick LLP, certified public accountants.

        5.2.21  SOLICITATION OF EMPLOYEES. Neither any member of Mountain West's
                board of directors nor any entity with which any such director
                is affiliated has solicited any employee of Mountain West or
                Glacier with the intention of causing the employee to terminate
                her employment with Mountain West or Glacier, as the case may
                be.

        5.2.22  DIRECTOR APPOINTMENT. Effective as of Closing, Mountain West has
                appointed Michael J. Blodnick to serve on Mountain West's board
                of directors.

        5.2.23  OTHER MATTERS. Glacier has received any other opinions,
                certificates, and documents that Glacier reasonably requests in
                connection with this Agreement and the Transaction.

5.3     CONDITIONS TO MOUNTAIN WEST'S OBLIGATIONS. All Mountain West's
        obligations under this Agreement are subject to satisfaction of the
        following conditions at or before Closing:

        5.3.1   REPRESENTATIONS. Glacier's representations and warranties in
                this Agreement and in any certificate or other instrument
                delivered in connection with this Agreement are true and correct
                in all material respects at Closing (except to the extent that
                they expressly relate to an earlier date, in which case they are
                true in all material respects as of that earlier date). These
                representations and warranties have the same force and effect as
                if they had been made at Closing. Glacier has delivered to
                Mountain West its certificate, executed by a duly authorized
                officer of Glacier and dated as of Closing, stating that these
                representations and warranties comply with this Subsection
                5.3.1.

        5.3.2   COMPLIANCE. Glacier has performed and complied in all material
                respects with all terms, covenants and conditions of this
                Agreement. Glacier has delivered to Mountain West its
                certificate, executed by a duly authorized officer of Glacier
                and dated as of Closing, stating that Glacier is in compliance
                with this Subsection 5.3.2.

        5.3.3   NO MATERIAL ADVERSE EFFECT. No damage, destruction, loss or
                other event or sequence of events has occurred which,
                individually or in the aggregate, has had or potentially may
                have a Material Adverse Effect with respect to Glacier.
                Glacier's certificate referred to in Subsection 5.3.1 states
                that the conditions identified in this Subsection 5.3.3 are
                satisfied.

        5.3.4   NO GOVERNMENTAL PROCEEDINGS. No action or proceeding has been
                commenced or threatened by any governmental agency to restrain,
                prohibit or invalidate the Transaction.

        5.3.5   CORPORATE AND STOCKHOLDER ACTION. Glacier's board of directors
                and Mountain West's stockholders have each approved the
                Transaction.

        5.3.6   TAX OPINION. The tax opinion specified in Subsection 5.2.13 has
                been delivered to Mountain West.

        5.3.7   OPINION OF COUNSEL. Glacier has obtained from Graham & Dunn,
                P.C. and delivered to Mountain West an opinion, addressed to
                Mountain West, substantially in the form attached to this
                Agreement as Exhibit E.



                                       28
<PAGE>   36

        5.3.8   FAIRNESS OPINION. Mountain West has received from Columbia an
                updated fairness opinion, dated as of or immediately before
                Mountain West mails the Prospectus/Proxy Statement to its
                stockholders, to the effect that the financial terms of the
                Transaction are financially fair to Mountain West's
                stockholders.

        5.3.9   CASH PAID. The aggregate of the cash paid to holders of Mountain
                West Common Stock under this Agreement and applicable law will
                not exceed 10% of the cash value of the Exchange Ratio, as it
                may be adjusted under this Agreement.

        5.3.10  REGISTRATION STATEMENT. The Registration Statement, as it may
                have been amended, required in connection with the Glacier
                Shares to be issued to stockholders under Subsection 1.6, and as
                described in Subsection 4.2, has become effective, and no stop
                order suspending the effectiveness of such Registration
                Statement has been issued or remains in effect, and no
                proceedings for that purpose have been initiated or threatened
                by the SEC the basis for which still exists.

        5.3.11  DIRECTOR APPOINTMENT. Effective as of Closing, Glacier has
                appointed Jon W. Hippler to serve on Glacier's board of
                directors.

                                    SECTION 6
                        DIRECTORS, OFFICERS AND EMPLOYEES

6.1     DIRECTORS. As a condition to the execution of this Agreement, each
        member of Mountain West's board of directors have entered into the
        written agreements described in Recital F with Glacier and Mountain West
        on or before the date this Agreement is signed. The director
        noncompetition agreements will take effect on the Effective Date.

6.2     EMPLOYMENT AGREEMENT. As a condition to the execution of this Agreement,
        Mountain West has entered into an employment agreement, effective as of
        the Effective Date, with Jon W. Hippler, Mountain West's current
        President and Chief Executive Officer. It is also anticipated that
        Mountain West will enter into employment agreements with Robert Beck,
        Diane Reed, Ronn C. Rich and Paula Smyly. As part of these employment
        agreements, all such individuals will waive all rights they may have
        under any previous employment agreements with Mountain West.

6.3     EMPLOYEES. Glacier presently intends to allow Mountain West's employees
        who are employed with Mountain West following the Transaction
        ("Continuing Employees") to participate in certain employee benefit
        plans in which employees of Glacier currently participate. Glacier
        intends to grant Continuing Employees credit for prior service with
        Mountain West for purposes of determining eligibility and vesting.
        Benefits for Continuing Employees will begin accruing under Glacier's
        plans as soon as practicable after Closing. This expression of intent is
        not a contract with Mountain West's employees and will not be construed
        to create a contract or employment right with Mountain West's employees.

6.4     INDEMNIFICATION.

        6.4.1   Glacier agrees that from and after the Effective Time until 3
                years following the Effective Date, Glacier will indemnify and
                hold harmless each present and former director and officer of
                Mountain West, determined as of the Effective Time (the
                "Indemnified Parties"), against any costs or expenses (including
                reasonable attorneys' fees), judgments, fines, losses, claims,
                damages or liabilities (collectively, "Costs") incurred in
                connection with any claim, action, suit, proceeding or
                investigation, whether civil, criminal, administrative or
                investigative, arising out of or pertaining to matters existing
                or occurring at or prior to the Effective Time, whether asserted


                                       29
<PAGE>   37

                or claimed prior to, at or after the Effective Time, to the
                fullest extent that Mountain West would have been permitted
                under Idaho law and the articles of incorporation or bylaws of
                Mountain West in effect on the date of this Agreement to
                indemnify such person (and Glacier will also advance expenses as
                incurred to the fullest extent permitted under applicable law;
                provided, that the person to whom expenses are advanced provides
                an undertaking to repay such advances if it is ultimately
                determined that such person is not entitled to indemnification).

        6.4.2   To the extent that paragraph (a) will not serve to indemnify and
                hold harmless an Indemnified Party, for a period of three years
                after the Effective Time, Glacier agrees that it will, subject
                to the terms set forth herein, indemnify and hold harmless, to
                the fullest extent permitted under applicable law (and Glacier
                will also advance expenses as incurred to the fullest extent
                permitted under applicable law, provided, that the person to
                whom expenses are advanced provides an undertaking to repay such
                advances if it is ultimately determined that such person is not
                entitled to indemnification), each Indemnified Party against any
                Costs incurred in connection with any claim, action, suit,
                proceeding or investigation, whether civil, criminal,
                administrative or investigative, arising out of or pertaining to
                the transactions contemplated by this Agreement. In the event
                any claim or claims are asserted or made within such three-year
                period, all rights to indemnification in respect of any such
                claim or claims will continue until final disposition of any and
                all such claims.

        6.4.3   Any Indemnified Party wishing to claim indemnification under
                Subsection 6.4.1 or 6.4.2, upon learning of any such claim,
                action, suit, proceeding or investigation, will promptly notify
                Glacier, but the failure to so notify will not relieve Glacier
                of any liability it may have to such Indemnified Party if such
                failure does not materially prejudice Glacier. In the event of
                any such claim, action, suit, proceeding or investigation
                (whether arising before or after the Effective Time), Glacier
                will have the right to assume the defense thereof and Glacier
                will not be liable to such Indemnified Parties for any legal
                expenses of other counsel or any other expenses subsequently
                incurred by such Indemnified Parties in connection with the
                defense thereof, except that, if Glacier elects not to assume
                such defense or counsel for the Indemnified Parties advises that
                there are issues which raise conflicts of interest between
                Glacier and the Indemnified Parties, the Indemnified Parties may
                retain counsel satisfactory to them, and Glacier will pay all
                reasonable fees and expenses of such counsel for the Indemnified
                Parties promptly as statements therefor are received. If such
                indemnity is not available with respect to any Indemnified
                Party, then Glacier and the Indemnified Party will contribute to
                the amount payable in such proportion as is appropriate to
                reflect relative faults and benefits.

6.5     EMPLOYEE BENEFIT ISSUES.

        6.5.1   COMPARABILITY OF BENEFITS. Glacier confirms to Mountain West its
                present intention to provide Continuing Employees with employee
                benefit programs which, in the aggregate, are generally
                competitive with employee benefit programs offered by financial
                institutions of comparable size located in Glacier's and
                Mountain West's market area.

        6.5.2   TERMINATION AND TRANSFER/MERGER OF PLANS. As soon as practicable
                after Closing, all employee benefit plans of Mountain West and
                its Subsidiaries will be terminated and the interests of
                Continuing Employees in those plans will be transferred or
                merged into Glacier's employee benefit plans.

        6.5.3   NO CONTRACT CREATED. Nothing in this Agreement gives any
                employee of Mountain West or its Subsidiaries a right to
                continuing employment.



                                       30
<PAGE>   38

                                    SECTION 7
                          TERMINATION OF AGREEMENT AND
                           ABANDONMENT OF TRANSACTION

7.1     TERMINATION BY REASON OF LAPSE OF TIME. If Closing does not occur before
        the Termination Date, either Glacier or Mountain West may terminate this
        Agreement and the Transaction if all of the following conditions are
        present:

        (a)     the terminating party's board of directors decides to terminate
                by a majority vote of its members;

        (b)     the terminating party delivers to the other party written notice
                that its board of directors has voted in favor of termination;
                and

        (c)     the failure to consummate the Transaction by the Termination
                Date is not due to a breach by the party seeking termination of
                any of its obligations, covenants, or representations in this
                Agreement.

7.2     OTHER GROUNDS FOR TERMINATION. This Agreement and the Transaction may be
        terminated at any time before Closing (whether before or after
        applicable approval of this Agreement by Mountain West's stockholders,
        unless otherwise provided) as follows:

        7.2.1   MUTUAL CONSENT. By mutual consent of Mountain West and Glacier,
                if the boards of directors of each party agrees to terminate by
                a majority vote of its members.

        7.2.2   MOUNTAIN WEST'S CONDITIONS NOT MET. By Glacier's board of
                directors if, by March 31, 2000, any condition set forth in
                Subsections 5.1 or 5.2 has not been satisfied.

        7.2.3   GLACIER'S CONDITIONS NOT MET. By Mountain West's board of
                directors if, by March 31, 2000, any condition set forth in
                Subsections 5.1 or 5.3 has not been satisfied.

        7.2.4   MOUNTAIN WEST FAILS TO RECOMMEND STOCKHOLDER APPROVAL OR OPTION
                BECOMES EXERCISABLE. By Glacier's board of directors before
                Mountain West's stockholders approve the Transaction, if
                Mountain West's board of directors: (a) fails to recommend to
                its stockholders the approval of the Transaction or (b)
                modifies, withdraws or changes in a manner adverse to Glacier
                its recommendation to stockholders to approve the Transaction.

        7.2.5   IMPRACTICABILITY. By either Glacier or Mountain West, upon
                written notice given to the other party, if the board of
                directors of the party seeking termination under this Subsection
                7.2.5 has determined in its sole judgment, made in good faith
                and after due consideration and consultation with counsel, that
                the Transaction has become inadvisable or impracticable by
                reason of the institution of litigation by the federal
                government or the government of the States of Idaho or Montana
                to restrain or invalidate the Transaction or this Agreement.

7.3     MOUNTAIN WEST TERMINATION FEE. Mountain West acknowledges that Glacier
        has incurred expenses, direct and indirect, in negotiating and executing
        this Agreement and in taking steps to effect Transaction. Accordingly,
        Mountain West will pay to Glacier $200,000, if (1) this Agreement
        terminates because Mountain West does not use all reasonable efforts to
        consummate the Transaction in accordance with the terms of this
        Agreement; (2) Mountain West terminates this Agreement for any reason
        other than the grounds for termination set forth in Subsections 7.1,
        7.2.1, 7.2.3 or 7.2.5; or (3) Glacier terminates this Agreement under
        Subsections 7.2.2 (other then for failure of a condition set forth in
        Subsections 5.1, 5.2.10, 5.2.13, 5.2.17, 5.2.19 or 5.2.20) or 7.2.4. If
        this termination fee becomes payable, it will be



                                       31
<PAGE>   39

        payable on Glacier's demand and must be paid by Mountain West within 3
        business days of the date Glacier makes the demand. Glacier's rights
        under the Stock Option Agreement are in addition to this Subsection 7.3,
        and this Subsection 7.3 does not limit or restrict these rights or the
        circumstances under which Glacier may exercise the Option.

7.4     GLACIER TERMINATION FEE.. Due to expenses, direct and indirect, incurred
        by Mountain West in negotiating and executing this Agreement and in
        taking steps to effect the Transaction, Glacier will pay to Mountain
        West $100,000 if (1) Glacier terminates this Agreement for any reason
        other than the grounds for termination set forth in Subsections 7.1,
        7.2.1, 7.2.2, 7.2.4 or 7.2.5 or (2) Mountain West terminates this
        Agreement under Subsection 7.2.3 (other than for failure of a condition
        set forth in 5.1, 5.3.4, 5.3.6, 5.3.8, 5.3.9, 5.3.10, or 5.3.11, unless
        the failure of any of those conditions is due to Glacier's fault). If
        this termination fee becomes payable, it will be payable on Mountain
        West's demand and must be paid by Glacier within 3 business days of the
        date Mountain West makes the demand.

7.5     COST ALLOCATION UPON TERMINATION. In connection with the termination of
        this Agreement under this Subsection 7.5, except as provided in
        Subsections 7.3 and 7.4, Glacier and Mountain West will each pay their
        own out-of-pocket costs incurred in connection with this Agreement, and
        will have no other liability to the other party.

                                    SECTION 8
                                  MISCELLANEOUS

8.1     NOTICES. Any notice, request, instruction or other document given under
        this Agreement must be in writing and must either be delivered
        personally or via facsimile transmission or be sent by registered or
        certified mail, postage prepaid, and addressed as follows (or to any
        other address or person representing any party as designated by that
        party through written notice to the other party):

        Glacier                          Glacier Bancorp, Inc.
                                         49 Commons Loop
                                         Kalispell, MT  59901
                                         Attn: Michael J. Blodnick

                                         Stephen M. Klein, Esq.
                                         Graham & Dunn, P.C.
               with a copy to:           1420 Fifth Avenue, 33rd Floor
                                         Seattle, WA  98101-2390

        Mountain West                    Mountain West Bank
                                         P.O. Box 1059
                                         125 Ironwood Drive
                                         Coeur d'Alene, ID  83816
                                         Attn: Jon W. Hippler

               with a copy to:           Wayne Sweney, Esq.
                                         Lukins & Annis, P.S.
                                         250 NW Blvd., Suite 102
                                         Coeur d'Alene, ID  83814




                                       32
<PAGE>   40

8.2     WAIVERS AND EXTENSIONS. Subject to Section 9, Glacier or Mountain West
        may grant waivers or extensions to the other party, but only through a
        written instrument executed by the Chief Executive Officer or President
        of the party granting the waiver or extension. Waivers or extensions
        which do not comply with the preceding sentence are not effective. In
        accordance with this Section 8, a party may extend the time for the
        performance of any of the obligations or other acts of any other party,
        and may waive:

        (a)     any inaccuracies of any other party in the representations and
                warranties contained in this Agreement or in any document
                delivered in connection with this Agreement;

        (b)     compliance with any of the covenants of any other party; and

        (c)     any other party's performance of any obligations under this
                Agreement and any other condition precedent set out in Section
                5.

8.3     GENERAL INTERPRETATION. Except as otherwise expressly provided in this
        Agreement or unless the context clearly requires otherwise: (1) the
        defined terms defined in this Agreement include the plural as well as
        the singular and (2) references in this Agreement to Sections,
        Subsections, Schedules, and Exhibits refer to Sections and Subsections
        of and Schedules and Exhibits to this Agreement. Whenever the words
        "include", "includes", or "including" are used in this Agreement, the
        parties intend them to be interpreted as if they are followed by the
        words "without limitation." All accounting terms used in this Agreement
        that are not expressly defined in this Agreement have the respective
        meanings given to them in accordance with GAAP.

8.4     CONSTRUCTION AND EXECUTION IN COUNTERPARTS. Except as otherwise
        expressly provided in this Agreement, this Agreement: (1) contains the
        parties' entire understanding, and no modification or amendment of its
        terms or conditions will be effective unless in writing and signed by
        the parties, or their respective duly authorized agents; (2) will not be
        interpreted by reference to any of the titles or headings to the
        Sections or Subsections, which have been inserted for convenience only
        and are not deemed a substantive part of this Agreement; (3) includes
        all amendments to this Agreement, each of which is made a part of this
        Agreement by this reference; and (4) may be executed in one or more
        counterparts, each of which will be deemed an original, but all of which
        taken together will constitute one and the same document.

8.5     SURVIVAL OF REPRESENTATIONS AND COVENANTS. The representations and
        covenants in this Agreement will not survive Closing or termination of
        this Agreement, except that (1) Subsection 4.9 (confidentiality),
        Subsections 7.3 and 7.4 (termination fee), and Subsection 7.5 (expense
        allocation) will survive termination and Closing, and (2) the covenants
        in this Agreement that impose duties or obligations on the parties
        following Closing will survive Closing.

8.6     ATTORNEYS' FEES AND COSTS. In the event of any dispute or litigation
        with respect to the terms and conditions or enforcement of rights or
        obligations arising by reason of this Agreement or the Transaction, the
        prevailing party in any such litigation will be entitled to
        reimbursement from the other party for its costs and expenses, including
        reasonable judicial and extra-judicial attorneys' fees, expenses and
        disbursements, and fees, costs and expenses relating to any mediation or
        appeal.

8.7     ARBITRATION. At either party's request, the parties must submit any
        dispute, controversy or claim arising out of or in connection with, or
        relating to, this Agreement or any breach or alleged breach of this
        Agreement, to arbitration under the American Arbitration Association's
        rules then in effect (or under any other form of arbitration mutually
        acceptable to the parties). A single arbitrator agreed on by the parties
        will conduct the arbitration. If the parties cannot agree on a single
        arbitrator, each party must select one

                                       33
<PAGE>   41

        arbitrator and those two arbitrators will select a third arbitrator.
        This third arbitrator will hear the dispute. The arbitrator's decision
        is final (except as otherwise specifically provided by law) and binds
        the parties, and either party may request any court having jurisdiction
        to enter a judgment and to enforce the arbitrator's decision. The
        arbitrator will provide the parties with a written decision naming the
        substantially prevailing party in the action. This prevailing party is
        entitled to reimbursement from the other party for its costs and
        expenses, including reasonable attorneys' fees.

8.8     GOVERNING LAW AND VENUE. This Agreement will be governed by and
        construed in accordance with Montana law, except to the extent that
        certain matters may be governed by federal law. The parties must bring
        any legal proceeding arising out of this Agreement in Flathead County,
        Montana or in the U.S. District Court for the District of Montana.

8.9     SEVERABILITY. If a court determines that any term of this Agreement is
        invalid or unenforceable under applicable law, the remainder of this
        Agreement is not affected, and each remaining term is valid and
        enforceable to the fullest extent permitted by law.

                                    SECTION 9
                                   AMENDMENTS

        At any time before the Effective Date, whether before or after the
parties have obtained any applicable stockholder approvals of the Transaction,
the boards of directors of Glacier and Mountain West may: (1) amend or modify
this Agreement or any attached Exhibit or Schedule and (2) grant waivers or time
extensions in accordance with this Section 9. But, after Mountain West's
stockholders have approved this Agreement, the parties' boards of directors may
not without Mountain West stockholder approval amend or waive any provision of
this Agreement if the amendment or waiver would reduce the amount or change the
form of consideration Mountain West stockholders will receive in the
Transaction. All amendments, modifications, extensions and waivers must be in
writing and signed by the party agreeing to the amendment, modification,
extension or waiver. Failure by any party to insist on strict compliance by the
other party with any of its obligations, agreements or conditions under this
Agreement, does not, without a writing, operate as a waiver or estoppel with
respect to that or any other obligation, agreement, or condition.

                    [SIGNATURES APPEAR ON THE FOLLOWING PAGE]



                                       34
<PAGE>   42

        Signed as of September 9, 1999:

                                            GLACIER BANCORP, INC.


                                            By      /s/ Michael J. Blodnick
                                               ---------------------------------
                                            Name: Michael J. Blodnick
                                            Title: President and CEO


                                            MOUNTAIN WEST BANK


                                            By      /s/ Jon W. Hippler
                                               ---------------------------------
                                            Name:  Jon W. Hippler
                                            Title: President and CEO



                                       35
<PAGE>   43

STATE OF MONTANA      )
                      ) ss.
COUNTY OF FLATHEAD    )


        On this 9th day of September, 1999, before me personally appeared
Michael J. Blodnick, to me known to be the President and Chief Executive Officer
of GLACIER BANCORP, INC., the corporation that executed the foregoing
instrument, who acknowledged said instrument to be the free and voluntary act
and deed of said corporation, for the uses and purposes mentioned there, and who
stated on oath that he was authorized to execute said instrument, and that the
seal affixed (if any) was the official seal of said corporation.

        IN WITNESS OF THE FOREGOING, I have set my hand and official seal to
this document as of the day and year first written above.




                                            /s/ Lee Ann Wardinsky
                                            ------------------------------------
                                            NOTARY PUBLIC in and for the State
                                            of Montana
                                            residing at Kalispell.
                                            Title:  Executive Secretary.
                                            My commission expires:7-21-03.


STATE OF WASHINGTON   )
                      ) ss.
COUNTY OF SPOKANE     )


        On this 8th day of September, 1999, before me personally appeared Jon W.
Hippler, to me known to be the President and Chief Executive Officer of MOUNTAIN
WEST BANK, the corporation that executed the foregoing instrument, who
acknowledged said instrument to be the free and voluntary act and deed of said
corporation, for the uses and purposes mentioned there, and who stated on oath
that he was authorized to execute said instrument, and that the seal affixed (if
any) was the official seal of said corporation.

        IN WITNESS OF THE FOREGOING, I have set my hand and official seal to
this document as of the day and year first written above.




                                            /s/ Jody K. Hamilton
                                            ------------------------------------
                                            NOTARY PUBLIC in and for the State
                                            of Washington residing at Spokane.
                                            Title:                             .
                                                  ------------------------------
                                            My commission expires: 12/15/00.




                                       36

<PAGE>   1

                                   EXHIBIT 10

                             STOCK OPTION AGREEMENT

        This Stock Option Agreement ("Agreement"), dated as of September 9,
1999, is between MOUNTAIN WEST BANK ("Mountain West"), an Idaho banking
corporation, and GLACIER BANCORP, INC. ("Glacier"), a Delaware business
corporation.

        Mountain West and Glacier have executed a Plan and Agreement of Merger
("Merger Agreement"), of even date with this Agreement, which would result in
the merger of Mountain West with a newly formed bank subsidiary of Glacier.

        By negotiating and executing the Merger Agreement and by taking actions
necessary or appropriate to effect the transactions contemplated by the Merger
Agreement, Glacier has incurred and will incur substantial direct and indirect
costs (including, without limitation, the costs of management and employee time)
and will forgo the pursuit of certain alternative investments and transactions.

        THEREFORE, in consideration of the promises set forth in this Agreement
and in the Merger Agreement, the parties agree as follows:

1.      Grant of Option. Subject to the terms and conditions set forth in this
        Agreement, Mountain West irrevocably grants an option ("Option") to
        Glacier to purchase an aggregate of 206,326 authorized but unissued
        shares of Mountain West's Common Stock, no par value ("Common Stock")
        (which if issued, and assuming exercise of outstanding options to
        acquire the Common Stock, would represent approximately 19.9% of total
        stock issued and outstanding), at a per share price of $21 ("Option
        Price"), which was the estimated fair market value of the Common Stock
        at June 30, 1999.

2.      Exercise of Option. Subject to the provisions of this Section 2 and of
        Section 130 of this Agreement, this Option may be exercised by Glacier
        or any transferee as set forth in Section 5 of this Agreement, in whole
        or in part, at any time, or from time to time in any of the following
        circumstances:

        (a)     Mountain West or its board of directors enters into an agreement
                or recommends to Mountain West shareholders an agreement (other
                than the Merger Agreement) under which any entity, person or
                group (collectively "Person"), within the meaning of Section
                13(d)(3) of the Securities Exchange Act of 1934, as amended
                ("Exchange Act"), would: (1) merge or consolidate with, acquire
                51% or more of the assets or liabilities of, or enter into any
                similar transaction with Mountain West, or (2) purchase or
                otherwise acquire (including by merger, consolidation, share
                exchange or any similar transaction) securities representing 10%
                or more of Mountain West's voting shares of Mountain West;



                                       1
<PAGE>   2

        (b)     any Person (other than Glacier or any of its subsidiaries and
                other than any Person owning as of the date of this Agreement
                10% or more of the voting shares of Mountain West) acquires the
                beneficial ownership or the right to acquire beneficial
                ownership of securities which, when aggregated with other such
                securities owned by such Person, represents 10% or more of the
                voting shares of Mountain West (the term "beneficial ownership"
                for purposes of this Agreement has the meaning set forth in
                Section 13(d) of the Exchange Act, and the regulations
                promulgated under the Exchange Act); notwithstanding the
                foregoing, the Option will not be exercisable in the
                circumstances described above in this subsection (b) if a Person
                acquires the beneficial ownership of securities which, when
                aggregated with other such securities owned by such Person,
                represents 10% or more, but less than 25%, of the voting shares
                of Mountain West and the transaction does not result in, and is
                not presumed to constitute, "control" as defined under Section
                7(j) of the Federal Deposit Insurance Act or 12 CFR Part 303.4;

        (c)     failure of the board of directors of Mountain West to recommend,
                or withdrawal by the board of directors of a prior
                recommendation of, the Merger to the shareholders; or

        (d)     failure of the shareholders to approve the Merger by the
                required affirmative vote at a meeting of the shareholders,
                after any Person (other than Glacier or a subsidiary of Glacier)
                announces publicly or communicates, in writing, to Mountain West
                a proposal to (1) acquire Mountain West (by merger,
                consolidation, the purchase of 51% or more of its assets or
                liabilities or any other similar transaction), (2) purchase or
                otherwise acquire securities representing 25% or more of the
                voting shares of Mountain West or (3) change the composition of
                the board of directors of Mountain West.

        It is understood and agreed that the Option will become exercisable on
        the occurrence of any of the above-described circumstances even though
        the circumstance occurred as a result, in part or in whole, of the board
        of Mountain West complying with its fiduciary duties.

        Notwithstanding the foregoing, the Option may not be exercised if either
        (1) any applicable and required governmental approvals have not been
        obtained with respect to such exercise or if such exercise would violate
        any applicable regulatory restrictions, or (2) at the time of exercise,
        Glacier is failing in any material respect to perform or observe its
        covenants or conditions under the Merger Agreement, unless the reason
        for such failure is that Mountain West is failing to perform or observe
        its covenants or conditions under the Merger Agreement.



                                       2
<PAGE>   3

        3. Notice, Time and Place of Exercise. Each time that Glacier or any
        transferee wishes to exercise any portion of the Option, Glacier or such
        transferee will give written notice of its intention to exercise the
        Option specifying the number of shares as to which the Option is being
        exercised ("Option Shares") and the place and date for the closing of
        the exercise (which date may not be later than ten business days from
        the date such notice is mailed). If any law, regulation or other
        restriction will not permit such exercise to be consummated during this
        ten-day period, the date for the closing of such exercise will be within
        five days following the cessation of the restriction on consummation.

4.      Payment and Delivery of Certificate(s). At any closing for an exercise
        of the Option or any portion thereof, (a) Glacier and Mountain West will
        each deliver to the other certificates as to the accuracy, as of the
        closing date, of their respective representations and warranties under
        this Agreement, (b) Glacier or the transferees will pay the aggregate
        purchase price for the shares of Common Stock to be purchased by
        delivery of a certified or bank cashier's check in immediately available
        funds payable to the order of Mountain West, and (c) Mountain West will
        deliver to Glacier or the transferees a certificate or certificates
        representing the shares so purchased.

5.      Transferability of the Option and Option Shares. Before the Option, or a
        portion of the Option, becomes exercisable in accordance with the
        provisions of Section 2 of this Agreement, neither the Option nor any
        portion of the Option will be transferable. If any of the events or
        circumstances set forth in Sections 20 through 0 above occur, Glacier
        may freely transfer, subject to applicable federal and state securities
        laws, the Option or any portion of the Option, or any of the Option
        Shares.

        For purposes of this Agreement, a merger or consolidation of Glacier
        (whether or not Glacier is the surviving entity) or an acquisition of
        Glacier will not be deemed a transfer.

6.      Representations, Warranties and Covenants of Mountain West. Mountain
        West represents and warrants to Glacier as follows:

        (a)     Due Authorization. This Agreement has been duly authorized by
                all necessary corporate action on the part of Mountain West, has
                been duly executed by a duly authorized officer of Mountain West
                and constitutes a valid and binding obligation of Mountain West.
                No shareholder approval by Mountain West shareholders is
                required by applicable law or otherwise before the exercise of
                the Option in whole or in part.

        (b)     Option Shares. Mountain West has taken all necessary corporate
                and other action to authorize and reserve and to permit it to
                issue and, at all times from the date of this Agreement to such
                time as the obligation to deliver shares under this Agreement
                terminates, will have reserved for issuance, at the closing(s)
                upon exercise of the Option, or any portion of the Option, the
                Option Shares (subject to adjustment, as provided in Section 8
                below), all of which, upon issuance under this Agreement, will
                be duly and validly issued, fully paid and nonassessable, and



                                       3
<PAGE>   4

                will be delivered free and clear of all claims, liens,
                encumbrances and security interests, including any preemptive
                right of any of the shareholders of Mountain West.

        (c)     No Conflicts. Neither the execution and delivery of this
                Agreement nor the consummation of the transactions contemplated
                by it will violate or result in any violation of or be in
                conflict with or constitute a default under any term of the
                articles of incorporation or bylaws of Mountain West or any
                agreement, instrument, judgment, decree, law, rule or order
                applicable to Mountain West or any subsidiary of Mountain West
                or to which Mountain West or any such subsidiary is a party.

        (d)     Notification of Record Date. At any time from and after the date
                of this Agreement until the Option is no longer exercisable,
                Mountain West will give Glacier or any transferee 30 days prior
                written notice before setting the record date for determining
                the holders of record of the Common Stock entitled to vote on
                any matter, to receive any dividend or distribution or to
                participate in any rights offering or other matters, or to
                receive any other benefit or right, with respect to the Common
                Stock.

7.      Representations, Warranties and Covenants of Glacier. Glacier represents
        and warrants to Mountain West as follows:

        (a)     Due Authorization. This Agreement has been duly authorized by
                all necessary corporate action on the part of Glacier, has been
                duly executed by a duly authorized officer of Glacier and
                constitutes a valid and binding obligation of Glacier.

        (b)     Transfers of Common Stock. No shares of Common Stock acquired
                upon exercise of the Option will be transferred except in a
                transaction registered or exempt from registration under any
                applicable securities laws.

        (c)     No Conflicts. Neither the execution and delivery of this
                Agreement nor the consummation of the transactions contemplated
                by it will violate or result in any violation of or be in
                conflict with or constitute a default under any term of the
                certificate of incorporation or bylaws of Glacier or any
                agreement, instrument, judgment, decree, law, rule or order
                applicable to Glacier or any subsidiary of Glacier or to which
                Glacier or any such subsidiary is a party.

8.      Adjustment Upon Changes in Capitalization. In the event of any change in
        the Common Stock by reason of stock dividends, split-ups, mergers,
        recapitalizations, combinations, exchanges of shares or the like, the
        number and kind of shares or securities subject to the Option and the
        purchase price per share of Common Stock will be appropriately adjusted.
        If, before the Option terminates or is exercised, Mountain West is
        acquired by another party, consolidates with or merges into another
        corporation or liquidates, Glacier or any



                                       4
<PAGE>   5

        transferee will thereafter receive, upon exercise of the Option, the
        securities or properties to which a holder of the number of shares of
        Common Stock then deliverable upon the exercise thereof would have been
        entitled upon such acquisition, consolidation, merger or liquidation,
        and Mountain West will take all steps in connection with such
        acquisition, consolidation, merger or liquidation as may be necessary to
        assure that the provisions of this agreement will thereafter be
        applicable, as nearly as reasonably may be practicable, in relation to
        any securities or property thereafter deliverable upon exercise of the
        Option.

9.      Nonassignability. This Agreement binds and inures to the benefit of the
        parties and their successors. This Agreement is not assignable by either
        party, but Glacier may transfer the Option, the Option Shares or any
        portion of the Option or Option Shares in accordance with Section 5. A
        merger or consolidation of Glacier (whether or not Glacier is the
        surviving entity) or an acquisition of Glacier will not be deemed an
        assignment or transfer.

10.     Regulatory Restrictions. Mountain West will use its best efforts to
        obtain or to cooperate with Glacier or any transferee in obtaining all
        necessary regulatory consents, approvals, waivers or other action
        (whether regulatory, corporate or other) to permit the acquisition of
        any or all Option Shares by Glacier or any transferee.

11.     Remedies. Mountain West agrees that if for any reason Glacier or any
        transferee will have exercised its rights under this Agreement and
        Mountain West will have failed to issue the Option Shares to be issued
        upon such exercise or to perform its other obligations under this
        Agreement, unless such action would violate any applicable law or
        regulation by which Mountain West is bound, then Glacier or any
        transferee will be entitled to specific performance and injunctive and
        other equitable relief. Glacier agrees that if it fails to perform any
        of its obligations under this Agreement, then Mountain West will be
        entitled to specific performance and injunctive and other equitable
        relief. This provision is without prejudice to any other rights that
        Mountain West or Glacier or any transferee may have against the other
        party for any failure to perform its obligations under this Agreement.

12.     No Rights as Shareholder. This Option, before it is exercised, will not
        entitle its holder to any rights as a shareholder of Mountain West at
        law or in equity. Specifically, this Option, before it is exercised,
        will not entitle the holder to vote on any matter presented to the
        shareholders of Mountain West or, except as provided in this Agreement,
        to any notice of any meetings of shareholders or any other proceedings
        of Mountain West.

13.     Miscellaneous.

        (a)     Termination. This Agreement and the Option, to the extent not
                previously exercised, will terminate upon the earliest of (1)
                April 30, 2000; (2) the mutual agreement of the parties to this
                Agreement; (3) 31 days after the date on which any application
                for regulatory approval for the Merger has been denied, but if
                before the expiration of the 31-day period, Mountain West or
                Glacier is engaged



                                       5
<PAGE>   6

                in litigation or an appeal procedure relating to an attempt to
                obtain approval of the Merger, this Agreement will not terminate
                until the earlier of (i) April 30, 2000, or (ii) 31 days after
                the completion of the litigation and appeal procedure; (4) the
                30th day following the termination of the Merger Agreement for
                any reason other than a material noncompliance or default by
                Glacier with respect to its obligations under it; or (5) the
                date of termination of the Merger Agreement if the termination
                is due to a material noncompliance or default by Glacier with
                respect to its obligations under it; but if the Option has been
                exercised, in whole or in part, before the termination of this
                Agreement, then the exercise will close under Section 4 of this
                Agreement, even though that closing date is after the
                termination of this Agreement; and if the Option is sold before
                the termination of this Agreement, the Option may be exercised
                by the transferee at any time within 31 days after the date of
                termination even though such exercise or the closing of such
                exercise occurs after the termination of this Agreement.

        (b)     Amendments. This Agreement may not be modified, amended, altered
                or supplemented, except upon the execution and delivery of a
                written agreement executed by the parties.

        (c)     Severability of Terms. Any provision of this Agreement that is
                invalid, illegal or unenforceable is ineffective only to the
                extent of the invalidity, illegality or unenforceability without
                affecting in any way the remaining provisions or rendering any
                other provisions of this Agreement invalid, illegal or
                unenforceable. Without limiting the generality of the foregoing,
                if the right of Glacier or any transferee to exercise the Option
                in full for the total number of shares of Common Stock or other
                securities or property issuable upon the exercise of the Option
                is limited by applicable law, or otherwise, Glacier or any
                transferee may, nevertheless, exercise the Option to the fullest
                extent permissible.

        (d)     Notices. All notices, requests, claims, demands and other
                communications under this Agreement must be in writing and must
                be given (and will be deemed to have been duly received if so
                given) by delivery, by cable, telecopies or telex, or by
                registered or certified mail, postage prepaid, return receipt
                requested, to the respective parties at the addresses below, or
                to such other address as either party may furnish to the other
                in writing. Change of address notices will be effective upon
                receipt.

                If to Mountain West to:

                             Mountain West Bank
                             P.O. Box 1059
                             125 Ironwood Drive
                             Coeur d'Alene, ID  83816
                             Attn: Jon W. Hippler



                                       6
<PAGE>   7

                With a copy to:

                             Wayne Sweney, Esq.
                             Lukins & Annis, P.S.
                             250 NW Boulevard, Suite 102
                             Coeur d'Alene, ID  83814

                If to Glacier, to:

                             Glacier Bancorp, Inc.
                             49 Commons Loop
                             Kalispell, MT  59901
                             Attn:  Michael J. Blodnick

                With a copy to:

                             Stephen M. Klein, Esq.
                             Graham & Dunn, P.C.
                             1420 Fifth Avenue, 33rd Floor
                             Seattle, WA  98101-2390

        (e)     Governing Law. The parties intend this Agreement and the Option,
                in all respects, including all matters of construction, validity
                and performance, to be governed by the laws of the State of
                Montana, without giving effect to conflicts of law principles.

        (f)     Counterparts. This Agreement may be executed in several
                counterparts, each of which is an original, and all of which
                together constitute one and the same agreement.

        (g)     Effects of Headings. The section headings in this Agreement are
                for convenience only and do not affect the meaning of its
                provisions.

                        [SIGNATURES APPEAR ON NEXT PAGE]



                                       7
<PAGE>   8

Dated September 9, 1999:

                                            GLACIER BANCORP, INC.

                                            BY /s/ Michael J. Blodnick
                                               ---------------------------------
                                            Michael J. Blodnick
                                            Its: President and CEO

                                            MOUNTAIN WEST BANK

                                            By   /s/ Jon W. Hippler
                                               ---------------------------------
                                            Jon W. Hippler
                                            Its: President and CEO



                                       8

<PAGE>   1

                                   EXHIBIT 99

                    GLACIER BANCORP, INC. AND MOUNTAIN WEST BANK TO MERGE

KALISPELL, MONTANA - Glacier Bancorp, Inc. (NASDAQ "GBCI") today announced the
signing of a definitive agreement whereby Mountain West Bank, Coeur d'Alene,
Idaho, will become a separate subsidiary of Glacier. Mountain West is a
commercial bank with approximately $87 million in assets, based in Coeur
d'Alene, with offices in Hayden Lake, Post Falls and Boise, Idaho. Glacier is a
bank holding company based in Kalispell, Montana, with approximately $850
million in assets and 24 offices in 16 Montana communities.

The combination of Glacier and Mountain West will create a banking company with
approximately $935 million in assets, $650 million in loans, and $87 million in
shareholders' equity. Following the combination, Mountain West, consistent with
the practice established by Glacier's other banking subsidiaries, will retain
its autonomy and local decision making authority. Both companies believe that
this will allow Mountain West to continue being responsive to the needs of the
Idaho communities it serves. Mountain West will continue to operate under its
current name with all directors, existing management and employees retained.

"I have known Jon Hippler for a long time," said Mick Blodnick, Glacier's
President and CEO, "and admire the excellent reputation and seasoned management
team he has built, which has allowed the bank to grow to over $87 million in
assets in only five years of operation. This is Glacier's first acquisition
outside the state of Montana and gives the company a presence in two of the
fastest growing markets in the state of Idaho. Coeur d'Alene, and Kootenai
County, where Mountain West currently has its largest presence, comprise one of
the fastest growing areas in the whole country. Kootenai County has increased
almost 45% in population since 1990 to about 100,000 people and is projected to
grow to 160,000 by 2010. In addition, the Boise area, where Mountain West opened
an office in 1998, is a very vibrant market and offers great potential to
Mountain West and the Glacier Banking Group."

Jon Hippler, President and CEO of Mountain West, stated that "We believe this
merger makes a lot of sense for shareholders, customers and employees of
Mountain West. The enhanced financial and managerial resources that Glacier
provides will allow us to more quickly implement our growth strategy,
particularly in the rapidly growing Boise market. Our shareholders will receive
enhanced liquidity, an immediate premium, regular cash dividends and be part of
a more diversified growing company with a superior track record. Our employees
will continue to do what they do best, with the support and depth of a larger
community focused banking company."

Charles Nipp, Chairman of the Board of Mountain West, said that "the Board was
very focused on assuring that going forward Mountain West remain a separate
community bank able to make local decisions and deliver the responsive service
for which it has come to be known. We are convinced, by reviewing how Glacier
Bancorp interacts with its other subsidiary banks, that this indeed is the way
they conduct business."



<PAGE>   2

                            TERMS OF THE COMBINATION

Under the terms of the merger agreement, Mountain West shareholders will receive
1.18 shares of Glacier common stock for each Mountain West share held.
Outstanding Mountain West employee stock options will be converted at the same
exchange ratio into the right to receive Glacier common stock. The transaction,
which will be accounted for as a pooling of interests, is scheduled to close
next January. The deal is expected to be neutral to Glacier's earnings in 2000,
the year of completion of the transaction, without relying on any efficiencies
which may be realized from the combination. It is anticipated that the
transaction will be accretive to Glacier's earnings in subsequent years. After
the transaction, which is subject to the approval of Mountain West's
shareholders and regulatory authorities, Glacier will have a market
capitalization in excess of $200 million, with over 10 million shares
outstanding.

                              FINANCIAL PERFORMANCE

Glacier Bancorp is one of only a handful of financial institutions nationwide to
receive an A+ rating from Standard & Poor's rating service. Since going public
in 1984, Glacier's shareholders have enjoyed a compound annual return exceeding
25%. As of June 30, 1999 and including the recent acquisition of Big Sky Western
Bank, Glacier had total assets of $819 million, with $553 million in loans and
$79 million in shareholders' equity.

Mountain West Bank has produced strong and consistent growth over the past
several years. For the last three fiscal years ending March 31, 1999, the Bank
saw assets, loans, and deposits increase at compound annual rates of 35%, 31%
and 37%, respectively. At August 31, 1999, Mountain West had total assets of
$87.5 million, with over $53.7 million in loans and about $6.4 million in
shareholder equity.

Glacier previously announced a definitive agreement to acquire two branches in
Butte, Montana from Washington Mutual Bank. That deal is expected to close in
October of 1999 and will add approximately $80 million in deposits. Upon
completion of the branch acquisition and the Mountain West deal, Glacier is
expected to have approximately $950 million in total assets.

The discussion above with regards to the Glacier/Mountain West merger includes
certain "forward looking statements" concerning the future operations of the
companies. Glacier desires to take advantage of the "safe harbor" provisions of
the Private Securities Litigation Reform Act of 1995. This statement is for the
express purpose of availing Glacier of the protections of such safe harbor with
respect to all "forward looking statements." Management's ability to predict
results of the effect of future plans is inherently uncertain, and is subject to
factors that may cause actual results to differ materially from those projected.
Factors that could affect the actual results include the challenges inherent in
combining separate corporations in transactions such as the proposed merger and
unanticipated costs associated with the merger and the subsequent integration of
Mountain West as a subsidiary of Glacier.


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