BIG SKY BANCORP INC
8-K, 1998-05-01
SAVINGS INSTITUTION, FEDERALLY CHARTERED
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                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): April 23, 1998

                       Big Sky Bancorp, Inc.
                       ---------------------   
      (Exact name of registrant as specified in its charter)

    Delaware                      0-25284            81-0167980
- ---------------                   --------        -------------------
State or other jurisdiction      Commission       (I.R.S. Employer
   of incorporation              File Number      Identification No.)


711 South First Street, Hamilton, Montana            59840
- -----------------------------------------         ----------
(Address of principal executive offices)          (Zip Code)


Registrant's telephone number (including area code)  (406) 363-4400


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

<PAGE>


<PAGE>
Item 5.  Other Events

     On April 23, 1998, Big Sky Bancorp, Inc. ("Big Sky") entered into a
definitive merger agreement ("Agreement") with Sterling Financial Corporation
("Sterling") pursuant to which Big Sky will be merged into Sterling and Big
Sky's wholly-owned subsidiary, First Federal Savings and Loan Association of
Montana, will be merged into Sterling's wholly-owned subsidiary, Sterling
Savings Association.  The Agreement provides that each share of Big Sky's
common stock will be exchanged for $1.384 shares of Sterling common stock. 
The merger is intended to constitute a tax-free reorganization and to be
accounted for as a pooling-of- interests.

     Pursuant to the Agreement, Big Sky has agreed to pay Sterling a
termination fee of $500,000 in the event the Agreement is terminated under
certain conditions, including the failure of Big Sky's shareholders to approve
the Agreement or if the Agreement is terminated as a result of a breach by Big
Sky.  In connection with the Agreement, Sterling and certain of Big Sky's
shareholders have entered into a Stockholders Agreement pursuant to which the
Stockholders have agreed to vote a minimum of 68,000 shares of Big Sky common
stock in favor of the merger.  The Stockholders Agreement was entered into as
a condition to Sterling's entering into the Agreement.

     Consummation of the merger is subject to several conditions, including
receipt of applicable regulatory approval and approval by Big Sky's
shareholders.  For information regarding the terms of the proposed
transaction, reference is made to the Agreement and the press release dated
April 23, 1998, which are attached hereto as Exhibits 2 and 99, respectively,
and incorporated herein by reference.  

Item 7.  Financial Statements, Pro Forma Financial Information and Exhibits

     (c)  Exhibits:

          2    Agreement and Plan of Merger dated as of April 23, 1998 by and
               among Sterling Financial Corporation and Big Sky Bancorp, Inc.

          99   Press Release dated April 23, 1998.

<PAGE>


<PAGE>
                                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.

                                   
                            BIG SKY BANCORP, INC.



DATE: May 1, 1998      By:  /s/ Michael E. McKee
                            --------------------                 
                            Michael E. McKee
                            President

<PAGE>


<PAGE>
                                                                   Exhibit 2

                      AGREEMENT AND PLAN OF MERGER


                             BY AND BETWEEN
                                    
                                    
                    STERLING FINANCIAL CORPORATION 
                                    
                                    
                                  AND
                                    
                                    
                          BIG SKY BANCORP, INC.

<PAGE>


<PAGE>
                      AGREEMENT AND PLAN OF MERGER
                                    
                             BY AND BETWEEN
                                    
        STERLING FINANCIAL CORPORATION AND BIG SKY BANCORP, INC.

                           TABLE OF CONTENTS

                                                                    Page
                                                                    ----

ARTICLE I    THE MERGER. . . . . . . . . . . . . . . . . . . . . . . .1
        1.1  The Merger. . . . . . . . . . . . . . . . . . . . . . . .1
        1.2  Effective Time. . . . . . . . . . . . . . . . . . . . . .2
        1.3  Effects of the Merger . . . . . . . . . . . . . . . . . .2
        1.4  Conversion of Big Sky Common Stock. . . . . . . . . . . .2
        1.5  Sterling Common Stock . . . . . . . . . . . . . . . . . .3
        1.6  Options . . . . . . . . . . . . . . . . . . . . . . . . .3
        1.7  Articles of Incorporation . . . . . . . . . . . . . . . .4
        1.8  Bylaws. . . . . . . . . . . . . . . . . . . . . . . . . .4
        1.9  Directors and Officers. . . . . . . . . . . . . . . . . .4
        1.10 Tax Consequences. . . . . . . . . . . . . . . . . . . . .4
        1.11 Accounting Treatment. . . . . . . . . . . . . . . . . . .4

ARTICLE II   EXCHANGE OF SHARES. . . . . . . . . . . . . . . . . . . .5
        2.1  Sterling to Make Shares Available . . . . . . . . . . . .5
        2.2  Exchange of Shares; Conversion of Options . . . . . . . .5
        
ARTICLE III   REPRESENTATIONS AND WARRANTIES
              OF BIG SKY . . . . . . . . . . . . . . . . . . . . . . .7
        3.1  Corporate Organization. . . . . . . . . . . . . . . . . .7
        3.2  Capitalization. . . . . . . . . . . . . . . . . . . . . .8
        3.3  Authority; No Violation . . . . . . . . . . . . . . . . .9
        3.4  Consents and Approvals. . . . . . . . . . . . . . . . . 10
        3.5  Loan Portfolio; Reports . . . . . . . . . . . . . . . . 11
        3.6  Financial Statements; Exchange Act
                Filings; Books and Records . . . . . . . . . . . . . 12
        3.7  Broker's Fees . . . . . . . . . . . . . . . . . . . . . 12
        3.8  Absence of Certain Changes or Events. . . . . . . . . . 13
        3.9  Legal Proceedings . . . . . . . . . . . . . . . . . . . 13
        3.10 Taxes and Tax Returns . . . . . . . . . . . . . . . . . 14
        3.11 Employee Plans. . . . . . . . . . . . . . . . . . . . . 14
        3.12 Certain Contracts . . . . . . . . . . . . . . . . . . . 16
        3.13 Agreements with Regulatory Agencies . . . . . . . . . . 17

                                    i
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<PAGE>
        3.14 State Takeover Laws; Certificate of Incorporation . . . 17
        3.15 Environmental Matters . . . . . . . . . . . . . . . . . 17
        3.16 Reserves for Losses . . . . . . . . . . . . . . . . . . 18
        3.17 Properties and Assets . . . . . . . . . . . . . . . . . 19
        3.18 Insurance . . . . . . . . . . . . . . . . . . . . . . . 19
        3.19 Compliance with Applicable Laws . . . . . . . . . . . . 20
        3.20 Loans . . . . . . . . . . . . . . . . . . . . . . . . . 20
        3.21 Fairness Opinion. . . . . . . . . . . . . . . . . . . . 21
        3.22 Tax and Accounting Treatment of Merger. . . . . . . . . 21
        3.23 Undisclosed Liabilities . . . . . . . . . . . . . . . . 21
        3.24 Big Sky Information . . . . . . . . . . . . . . . . . . 22

ARTICLE IV   REPRESENTATIONS AND WARRANTIES. . . . . . . . . . . . . 22
             OF STERLING
        4.1  Corporate Organization. . . . . . . . . . . . . . . . . 22
        4.2  Capitalization. . . . . . . . . . . . . . . . . . . . . 23
        4.3  Authority; No Violation . . . . . . . . . . . . . . . . 23
        4.4  Consent and Approvals . . . . . . . . . . . . . . . . . 24
        4.5  Reports . . . . . . . . . . . . . . . . . . . . . . . . 25
        4.6  Financial Statements; Exchange Act
                Filings; Books and Records . . . . . . . . . . . . . 25
        4.7  Absence of Certain Changes or Events. . . . . . . . . . 26
        4.8  Compliance with Applicable Law. . . . . . . . . . . . . 26
        4.9  Employee Plans. . . . . . . . . . . . . . . . . . . . . 27
        4.10 Agreements with Regulatory Agencies . . . . . . . . . . 27
        4.11 Tax and Accounting Treatment of Merger. . . . . . . . . 27
        4.12 Legal Proceedings . . . . . . . . . . . . . . . . . . . 27
        4.13 Reserves for Losses . . . . . . . . . . . . . . . . . . 28
        4.14 Broker's Fees . . . . . . . . . . . . . . . . . . . . . 28
        4.15 Taxes . . . . . . . . . . . . . . . . . . . . . . . . . 28
        4.16 Sterling Information. . . . . . . . . . . . . . . . . . 29

ARTICLE V    COVENANTS RELATING TO CONDUCT OF BUSINESS . . . . . . . 29
        5.1  Covenants of Big Sky. . . . . . . . . . . . . . . . . . 29
        5.2  Covenants of Sterling . . . . . . . . . . . . . . . . . 33
        5.3  Merger Covenants. . . . . . . . . . . . . . . . . . . . 33
        5.4  Employment and Other Agreements . . . . . . . . . . . . 33

ARTICLE VI   ADDITIONAL AGREEMENTS.. . . . . . . . . . . . . . . . . 34
        6.1  Regulatory Matters. . . . . . . . . . . . . . . . . . . 34
        6.2  Access to Information . . . . . . . . . . . . . . . . . 35
        6.3  Stockholder Meetings. . . . . . . . . . . . . . . . . . 36
        6.4  Legal Conditions to Merger. . . . . . . . . . . . . . . 36

                                 ii
<PAGE>

<PAGE>
        6.5  Stock Exchange Listing. . . . . . . . . . . . . . . . . 37
        6.6  Employees . . . . . . . . . . . . . . . . . . . . . . . 37
        6.7  Indemnification . . . . . . . . . . . . . . . . . . . . 38
        6.8  Subsequent Interim and Annual Financial
                Statements . . . . . . . . . . . . . . . . . . . . . 39
        6.9  Additional Agreements . . . . . . . . . . . . . . . . . 39
        6.10 Advice of Changes . . . . . . . . . . . . . . . . . . . 39
        6.11 Current Information . . . . . . . . . . . . . . . . . . 40
        6.12 Execution and Authorization of
                Institution Merger Agreement . . . . . . . . . . . . 40
        6.13 Change in Structure . . . . . . . . . . . . . . . . . . 40
        6.14 Transaction Expenses of Big Sky . . . . . . . . . . . . 41
        6.15 Affiliate Agreements. . . . . . . . . . . . . . . . . . 41

ARTICLE VII  CONDITIONS PRECEDENT. . . . . . . . . . . . . . . . . . 41
        7.1  Conditions to Each Party's Obligation
                To Effect the Merger . . . . . . . . . . . . . . . . 41
        7.2  Conditions to Obligations of Sterling . . . . . . . . . 43
        7.3  Conditions to Obligations of Big Sky. . . . . . . . . . 44

ARTICLE VIII TERMINATION AND AMENDMENT . . . . . . . . . . . . . . . 44
        8.1  Termination . . . . . . . . . . . . . . . . . . . . . . 44
        8.2  Effect of Termination . . . . . . . . . . . . . . . . . 46
        8.3  Amendment . . . . . . . . . . . . . . . . . . . . . . . 47
        8.4  Extension; Waiver . . . . . . . . . . . . . . . . . . . 47

ARTICLE IX GENERAL PROVISIONS. . . . . . . . . . . . . . . . . . . . 47
        9.1  Closing . . . . . . . . . . . . . . . . . . . . . . . . 47
        9.2  Nonsurvival of Representations,
                Warranties and Agreements. . . . . . . . . . . . . . 47
        9.3  Expenses. . . . . . . . . . . . . . . . . . . . . . . . 48
        9.4  Notices . . . . . . . . . . . . . . . . . . . . . . . . 48
        9.5  Interpretation. . . . . . . . . . . . . . . . . . . . . 49
        9.6  Counterparts. . . . . . . . . . . . . . . . . . . . . . 49
        9.7  Entire Agreement. . . . . . . . . . . . . . . . . . . . 50
        9.8  Governing Law . . . . . . . . . . . . . . . . . . . . . 50
        9.9  Enforcement of Agreement. . . . . . . . . . . . . . . . 50
        9.10 Severability. . . . . . . . . . . . . . . . . . . . . . 50
        9.11 Publicity . . . . . . . . . . . . . . . . . . . . . . . 50
        9.12 Assignment; Limitation of Benefits. . . . . . . . . . . 51


                                    iii
<PAGE>


<PAGE>
EXHIBITS

   A    Form of Articles of Combination and Institution Merger Agreement
   B    Big Sky Disclosure Schedule
   C(1) Form of Certificate of Merger
   C(2) Articles of Merger
   D    Form of Agreement of Big Sky Affiliates
   E    Stockholders Agreement




                                    iv
<PAGE>



<PAGE>
                      AGREEMENT AND PLAN OF MERGER


   This AGREEMENT AND PLAN OF MERGER, dated as of April 23, 1998 (this
"Agreement"), is entered into by and between Sterling Financial Corporation, a
Washington corporation ("Sterling") and Big Sky Bancorp, Inc., a Delaware
corporation ("Big Sky").  

   WHEREAS, the Boards of Directors of Sterling and Big Sky have determined
that it is in the best interests of their respective companies and
stockholders to consummate the business combination transaction provided for
herein in which Big Sky will, subject to the terms and conditions set forth
herein, merge with and into Sterling, with Sterling being the surviving
corporation in such merger (the "Merger"); 

   WHEREAS, prior to the consummation of the Merger, Sterling and Big Sky will
respectively cause Sterling Savings Association, a Washington State chartered
savings and loan association and wholly-owned subsidiary of Sterling, and
First Federal Savings and Loan Association of Montana ("First Federal"), a
federally chartered savings and loan association and wholly-owned subsidiary
of Big Sky, to enter into a merger agreement, in the form attached hereto as
Exhibit A (the "Institution Merger Agreement"), providing for the merger (the
"Institution Merger") of First Federal with and into Sterling Savings
Association, with Sterling Savings Association being the "Surviving
Institution" of the Institution Merger, and it is intended that the
Institution Merger be consummated immediately after consummation of the
Merger; 

   WHEREAS, the Merger is intended to be treated as a "reorganization" within
the meaning of Section 368(a) of the Internal Revenue Code of 1986, as amended
(the "Code"), and as a "pooling of interests" under generally accepted
accounting principles; and

   WHEREAS, the parties desire to make certain representations, warranties and
agreements in connection with the Merger and also to prescribe certain
conditions to the Merger; 

   NOW, THEREFORE, in consideration of the mutual covenants, representations,
warranties and agreements contained herein, and intending to be legally bound
hereby, the parties agree as follows: 
 
                               ARTICLE I 
                               THE MERGER
                                    
   1.1  THE MERGER.  

   Subject to the terms and conditions of this Agreement, at the Effective
Time (as defined in Section 1.2 hereof), Big Sky shall merge with and into
Sterling, with Sterling being the surviving corporation (hereinafter sometimes
called the "Surviving Corporation") in the Merger.  Upon

                                    1
<PAGE>

<PAGE>
consummation of the Merger, the corporate existence of Big Sky shall cease and
the Surviving Corporation shall continue to exist as a Washington corporation. 

   1.2  EFFECTIVE TIME.  

   The Merger shall become effective on the Closing Date (as defined in
Section 9.1 hereof), as set forth in the certificate of merger (the
"Certificate of Merger") in the form attached as Exhibit C(1) hereto which
shall be filed with the Secretary of State of the State of Delaware on the
Closing Date and the articles of merger (the "Articles of Merger")  in the
form attached as Exhibit C(2) hereto which shall be filed with the Secretary
of State of the State of Washington on the Closing Date.  The term "Effective
Time" shall be the date and time when the Merger becomes effective on the
Closing Date, as set forth in the Certificate of Merger.  

   1.3  EFFECTS OF THE MERGER.  

        At and after the Effective Time, the Merger shall have the effects set
forth in Sections 259 and 261 of the Delaware General Corporation Law (the
"DGCL") and Section 23B.11.060 of the Washington Business Corporation Act (the
"WBCA").

   1.4  CONVERSION OF BIG SKY COMMON STOCK.  

        (a)  At the Effective Time, subject to Sections 1.4(b), 1.4(c) and
   1.4(d) hereof, each share of the common stock, par value $.01 per share, of
   Big Sky (the "Big Sky Common Stock") issued and outstanding prior to the
   Effective Time shall, by virtue of this Agreement and without any action on
   the part of the holder thereof, be converted into and exchangeable for 
   1.384 shares (the "Exchange Ratio") of the common stock, par value $1.00
   per share, of Sterling (the "Sterling Common Stock").  Subject to the last
   sentence of Section 1.4(b) hereof but notwithstanding any other provision
   of this Agreement, no more than 497,545 shares of Sterling Common Stock
   (the "Maximum Share Amount") shall be issued or become issuable in
   connection with the Merger and the other transactions contemplated by this
   Agreement (including shares issued or issuable in respect of shares of any
   capital stock of Big Sky, including Big Sky Common Stock, First
   Federal stock or any option or other right to acquire any such capital
   stock). 

           (b)  All of the shares of Big Sky Common Stock converted into
   Sterling Common Stock pursuant to this Article I shall no longer be
   outstanding and shall automatically be canceled and shall cease to exist,
   and each certificate (each a "Certificate") previously representing any
   such shares of Big Sky Common Stock shall thereafter represent the right to
   receive (i) the number of whole shares of Sterling Common Stock and (ii)
   cash in lieu of fractional shares into which the shares of Big Sky Common
   Stock represented by such Certificate have been converted pursuant to this
   Agreement. Certificates previously representing shares of Big Sky Common
   Stock shall be exchanged for certificates representing whole shares of
   Sterling Common Stock and cash in lieu of fractional shares

                                    2
<PAGE>


<PAGE>
   issued in consideration therefor upon the surrender of such Certificates in
   accordance with Section 2.2 hereof, without any interest thereon.  If after
   the date hereof and prior to the Effective Time Sterling should split or
   combine its common stock, or pay a dividend or other distribution in such
   common stock, then the Exchange Ratio and the Maximum Share Amount shall be
   appropriately adjusted to reflect such split, combination, dividend or
   distribution.  

           (c)  At the Effective Time, all shares of Big Sky Common Stock that
   are owned by Big Sky as treasury stock and all shares of Big Sky Common
   Stock that are owned directly or indirectly by Sterling or Big Sky or any
   Subsidiary of Big Sky or Sterling shall be canceled and shall cease to
   exist and no stock of Sterling or other consideration shall be delivered in
   exchange therefor. 

           For purposes of this Agreement, "Subsidiary" shall have the meaning
   given that term in Regulation S-X promulgated by the Securities and
   Exchange Commission (the "SEC").

           (d)  Certificates for fractions of shares of Sterling Common Stock
   will not be issued.  In lieu of a fraction of a share of Sterling Common
   Stock, each holder of Big Sky Common Stock otherwise entitled to a fraction
   of a share of Sterling Common Stock shall be entitled to receive an amount
   of cash equal to (i) the fraction of a share of the Sterling Common Stock
   to which such holder would otherwise be entitled, multiplied by (ii) the
   market value of the Sterling Common Stock, which shall be deemed to be the
   average of the daily closing prices per share for Sterling Common Stock for
   the twenty consecutive trading days on which shares of Sterling Common
   Stock are actually traded (as reported on the Nasdaq Stock Market National
   Market) ending on the third trading day preceding the Closing Date. 
   Following consummation of the Merger, no holder of Big Sky Common Stock
   shall be entitled to dividends or any other rights in respect of any such
   fraction.  

   1.5  STERLING COMMON STOCK.  

   Each share of Sterling Common Stock issued and outstanding immediately
prior to the Effective Time shall be unchanged and shall remain issued and
outstanding as common stock of the Surviving Corporation.  

   1.6  OPTIONS.  

   At the Effective Time, each option granted by Big Sky to purchase shares of
Big Sky Common Stock which is outstanding and unexercised immediately prior
thereto shall be converted automatically into an option to purchase shares of
Sterling Common Stock in an amount and at an exercise price determined as
provided below (and otherwise subject to the terms of the Big Sky 1992 Stock
Option and Incentive Plan (the "Big Sky Stock Option Plan"), under which such
option was granted:

                                    3
<PAGE>

<PAGE>
           (a)  The number of shares of Sterling Common Stock to be subject to
   the option immediately after the Effective Time shall be equal to the
   product of the number of shares of Big Sky Common Stock subject to the
   option immediately before the Effective Time, multiplied by the Exchange
   Ratio, provided that any fractional shares of Sterling Common Stock
   resulting from such multiplication shall be rounded down to the nearest
   share; and           

           (b)  The exercise price per share of Sterling Common Stock under
   the option immediately after the Effective Time shall be equal to the
   exercise price per share of Big Sky Common Stock under the option
   immediately before the Effective Time divided by the Exchange Ratio,
   provided that such exercise price shall be rounded to the nearest cent.
   The adjustment provided herein shall be and is intended to be effected in a
   manner which is consistent with Section 424(a) of the Code.  The duration
   and other terms of the option immediately after the Effective Time shall be
   the same as the corresponding terms in effect immediately before the
   Effective Time, except that all references to Big Sky or First Federal in
   the Big Sky Stock Option Plan (and the corresponding references in the
   option agreement documenting such option) shall be deemed to be references
   to Sterling.

   1.7  ARTICLES OF INCORPORATION.  

   At the Effective Time, the Articles of Incorporation of Sterling, as in
effect at the Effective Time, shall be the Articles of Incorporation of the
Surviving Corporation.  

   1.8  BYLAWS.  

   At the Effective Time, the Bylaws of Sterling, as in effect immediately
prior to the Effective Time, shall be the Bylaws of the Surviving Corporation. 

   1.9  DIRECTORS AND OFFICERS.  

   At the Effective Time, the directors and officers of Sterling immediately
prior to the Effective Time shall continue to be directors and officers of the
Surviving Corporation. 

   1.10 TAX CONSEQUENCES.  

   It is intended that the Merger, either alone or in conjunction with the
Institution Merger, shall constitute a reorganization within the meaning of
Section 368(a) of the Code, and that this Agreement shall constitute a "plan
of reorganization" for the purposes of the Code.  

   1.11 ACCOUNTING TREATMENT.  

   It is intended that the Merger shall be accounted for as a "pooling of
interests" under generally accepted accounting principles ("GAAP").

                                    4
<PAGE>

<PAGE>
                              ARTICLE II 
                           EXCHANGE OF SHARES
                                    
   2.1  STERLING TO MAKE SHARES AVAILABLE.  

   At or prior to the Effective Time, Sterling shall deposit, or shall cause
to be deposited, with Sterling's transfer agent, ChaseMellon Shareholder
Services, L.L.C., or such other bank, trust company or transfer agent as
Sterling may select (the "Exchange Agent"), for the benefit of the holders of
Certificates, for exchange in accordance with this Article II, certificates
representing the shares of Sterling Common Stock and the cash in lieu of
fractional shares (such cash and certificates for shares of Sterling Common
Stock, being hereinafter referred to as the "Exchange Fund") to be issued
pursuant to Section 1.4 and paid pursuant to Section 2.2(a) hereof in exchange
for outstanding shares of Big Sky Common Stock.  
 
   2.2  EXCHANGE OF SHARES; CONVERSION OF OPTIONS.  

        (a)  As soon as practicable after the Effective Time, the Exchange
   Agent shall mail to each holder of record of a Certificate or Certificates
   a form letter of transmittal (which shall specify that delivery shall be
   effected, and risk of loss and title to the Certificates shall pass, only
   upon delivery of the Certificates to the Exchange Agent) and instructions
   for use in effecting the surrender of the Certificates in exchange for
   certificates representing the shares of Sterling Common Stock and the cash
   in lieu of fractional shares into which the shares of Big Sky Common Stock
   represented by such Certificate or Certificates shall have been converted
   pursuant to this Agreement.  Big Sky shall have the right to review both
   the letter of transmittal and the instructions prior to such documents
   being finalized.  Upon surrender of a Certificate for exchange and
   cancellation to the Exchange Agent, together with such letter of
   transmittal, duly executed, the holder of such Certificate shall be
   entitled to receive in exchange therefor (x) a certificate representing
   that number of whole shares of Sterling Common Stock to which such holder
   of Big Sky Common Stock shall have become entitled pursuant to the
   provisions hereof and (y) a check representing the amount of cash in lieu
   of fractional shares, if any, which such holder has the right to receive in
   respect of the Certificate surrendered pursuant to the provisions of this
   Article II, and the Certificate so surrendered shall forthwith be canceled.
   No interest will be paid or accrued on the cash in lieu of fractional
   shares and unpaid dividends and distributions, if any, payable to holders
   of Certificates.

        (b)  No dividends or other distributions declared after the Effective
   Time with respect to Sterling Common Stock and payable to the holders of
   record thereof shall be paid to the holder of any unsurrendered Certificate
   until the holder thereof shall surrender such Certificate in accordance
   with this Article II.  After the surrender of a Certificate in accordance
   with this Article II, the record holder thereof shall be entitled to
   receive any such dividends or other distributions, without any interest
   thereon, which theretofore had become payable with respect to shares of
   Sterling Common Stock represented by such Certificate.

                                    5
<PAGE>

<PAGE>
   No holder of an unsurrendered Certificate shall be entitled, until the
   surrender of such Certificate, to vote the shares of Sterling Common Stock
   into which the holder's Big Sky Common Stock shall have been converted.

        (c)  As soon as practicable after the Effective Time, the Exchange
   Agent shall mail to each holder of any unexercised Options a form letter of
   transmittal and instructions for use in effecting the issuance of
   certificates representing the shares of Sterling Common Stock into which
   such Options shall have been converted pursuant to this Agreement.  Big Sky
   shall have the right to review both the letter of transmittal and the
   instructions prior to such documents being finalized.  Upon receipt by the
   Exchange Agent of such letter of transmittal, duly executed, the holder of
   such unexercised Option shall be entitled to receive in exchange therefor
   (x) a certificate representing that number of whole shares of Sterling
   Common Stock to which such holder of the unexercised Option shall have
   become entitled pursuant to the provisions of Section 1.6 and (y) a check
   representing the amount of cash in lieu of fractional shares, if any, which
   such holder has the right to receive pursuant to the provisions hereof.  No
   interest will be paid or accrued on the cash in lieu of fractional shares
   and unpaid dividends and distributions, if any, payable to holders of
   unexercised Options. 

        (d)  No dividends or other distributions declared after the Effective
   Time with respect to Sterling Common Stock and payable to the holders of
   record thereof shall be paid to the holder of an unexercised Option until
   the holder thereof shall submit the letter of transmittal as provided
   above, at which time the holder shall be entitled to receive any such
   dividends or other distributions, without any interest thereon, which
   theretofore had become payable with respect to shares of Sterling Common
   Stock into which the said Options were converted.  No holder of an
   unexercised Option shall be entitled, until submission of the letter of
   transmittal, to vote the shares of Sterling Common Stock into which the
   said Options shall have been converted.

        (e)  If any certificate representing shares of Sterling Common Stock
   is to be issued in a name other than that in which the Certificate
   surrendered in exchange therefor is registered, it shall be a condition of
   the issuance thereof that the Certificate so surrendered shall be properly
   endorsed (or accompanied by an appropriate instrument of transfer) and
   otherwise in proper form for transfer, and that the person requesting such
   exchange shall pay to the Exchange Agent in advance any transfer or other
   taxes required by reason of the issuance of a certificate representing
   shares of Sterling Common Stock in any name other than that of the
   registered holder of the Certificate surrendered, or shall establish to the
   satisfaction of the Exchange Agent that such tax has been paid or is not
   payable.  

        (f)  After the Effective Time, there shall be no transfers on the
   stock transfer books of Big Sky of the shares of Big Sky Common Stock which
   were issued and outstanding immediately prior to the Effective Time.  If,
   after the Effective Time, Certificates representing such shares are
   presented for transfer to the Exchange Agent, they

                                    6
<PAGE>

<PAGE>
   shall be canceled and exchanged for certificates representing shares of
   Sterling Common Stock as provided in this Article II.

        (g)  Any portion of the Exchange Fund that remains unclaimed by the
   stockholders of Big Sky for six months after the Effective Time shall be
   returned to Sterling.  Any stockholders of Big Sky who have not theretofore
   complied with this Article II shall thereafter look only to Sterling for
   payment of their shares of Sterling Common Stock, cash in lieu of
   fractional shares and unpaid dividends and distributions on Sterling Common
   Stock deliverable in respect of each share of Big Sky Common Stock such
   stockholder holds as determined pursuant to this Agreement, in each case,
   without any interest thereon.  Notwithstanding the foregoing, none of
   Sterling, Big Sky, the Exchange Agent or any other person shall be liable
   to any former holder of shares of Big Sky Common Stock for any amount
   properly delivered to a public official pursuant to applicable abandoned
   property, escheat or similar laws.

        (h)  In the event any Certificate shall have been lost, stolen or
   destroyed, upon the making of an affidavit of that fact by the person
   claiming such Certificate to be lost, stolen or destroyed and, if required
   by Sterling, the posting by such person of a bond in such amount as
   Sterling may reasonably direct as indemnity against any claim that may be
   made against it with respect to such Certificate, the Exchange Agent will
   issue in exchange for such lost, stolen or destroyed Certificate the shares
   of Sterling Common Stock and cash in lieu of fractional shares deliverable
   in respect thereof pursuant to this Agreement.

                              ARTICLE III 
               REPRESENTATIONS AND WARRANTIES OF BIG SKY
                                    
   Big Sky, on behalf of itself and First Federal, hereby makes the following
representations and warranties to Sterling as set forth in this Article III,
each of which is being relied upon by Sterling as a material inducement to it
to enter into and perform this Agreement.  

   3.1  CORPORATE ORGANIZATION.  

        (a)  Big Sky is a corporation duly organized, validly existing and in
   good standing under the laws of the State of Delaware.  Big Sky has the
   corporate power and authority to own or lease all of its properties and
   assets and to carry on its business as it is now being conducted, and is
   duly licensed or qualified to do business in each jurisdiction in which the
   nature of any material business conducted by it or the character or
   location of any material properties or assets owned or leased by it makes
   such licensing or qualification necessary.  Big Sky is duly registered as a
   savings and loan holding company with the Office of Thrift Supervision (the
   "OTS") under the Home Owners' Loan Act of 1933 (the "HOLA").  First Federal
   is the only Subsidiary of Big Sky.  Section 3.1(a) of the disclosure
   schedule which is attached hereto as Exhibit B (the "Big Sky Disclosure
   Schedule") sets forth true, correct

                                    7
<PAGE>


<PAGE>
   and complete copies of the Certificate of Incorporation and Bylaws of Big
   Sky as in effect as of the date of this Agreement.

        (b)  First Federal is a federally chartered savings association duly
   organized, validly existing and in good standing under the laws of the
   United States.  The deposit accounts of First Federal are insured by the
   Federal Deposit Insurance Corporation (the "FDIC") through the Savings
   Association Insurance Fund (the "SAIF") to the fullest extent permitted by
   law, and all premiums and assessments required in connection therewith have
   been paid by First Federal.  First Federal has no Subsidiaries.  First
   Federal has the corporate or other power and authority to own or lease all
   of its properties and assets and to carry on its business as it is now
   being conducted and is duly licensed or qualified to do business in each
   jurisdiction in which the nature of any material business conducted by it
   or the character or the location of any material properties or assets owned
   or leased by it makes such licensing or qualification necessary.  Section
   3.1(b) of the Big Sky Disclosure Schedule sets forth true, correct and 
   complete copies of the Charter and Bylaws of First Federal as in effect as
   of the date of this Agreement.  

   3.2  CAPITALIZATION.  

        (a)  The authorized capital stock of Big Sky consists of 1,500,000
   shares of Big Sky Common Stock, par value $.01 per share and, 500,000
   shares of serial preferred stock, par value $.01 per share.  As of the date
   hereof, there are (x) 323,721 shares of Big Sky Common Stock issued and
   outstanding (including 15,000 shares issued pursuant to the Big Sky MRD
   Plan), and no shares of Big Sky Common Stock held in Big Sky's treasury,
   and (y) no shares of Big Sky Common Stock reserved for issuance upon
   exercise of outstanding stock options or otherwise, except for (i) 39,100
   shares of Big Sky Common Stock reserved for issuance pursuant to the Big
   Sky Stock Option Plan (of which options for 35,777 shares are currently
   outstanding).  No shares of the said serial preferred stock are issued and
   outstanding.  All of the issued and outstanding shares of Big Sky Common
   Stock have been duly authorized and validly issued and are fully paid,
   nonassessable and free of preemptive rights, with no personal liability
   attaching to the ownership thereof.  Except for the Big Sky Stock Option
   Plan and the Big Sky MRD Plan, Big Sky does not have and is not bound by
   any outstanding subscriptions, options, warrants, calls, commitments or
   agreements of any character calling for the purchase or issuance of any
   shares of Big Sky Common Stock or any other equity security of Big Sky or
   any securities representing the right to purchase or otherwise receive any
   shares of Big Sky Common Stock or any other equity security of Big Sky. 
   The names of the optionees, the date of each option to purchase Big Sky
   Common Stock granted, the number of shares subject to each such option and
   the price at which each such option may be exercised under the Big Sky
   Stock Option Plan are set forth in Section 3.2(a) of the Big Sky Disclosure
   Schedule and no such option expires more than 10 years from the date of the
   grant thereof.  Since December 31, 1997 Big Sky has not issued any shares
   of its capital stock or any securities convertible into or exercisable for
   any shares of its capital stock, other than pursuant to the exercise of
   director or employee stock options

                                    8
<PAGE>


<PAGE>
   granted prior to December 31, 1997, under the Big Sky Stock Option Plan and
   pursuant to the Big Sky MRD Plan.  

        (b)  Big Sky owns, directly or indirectly, all of the issued and
   outstanding shares of capital stock of First Federal, free and clear of all
   liens, charges, encumbrances and security interests whatsoever, and all of
   such shares are duly authorized and validly issued and are fully paid,
   nonassessable and free of preemptive rights, with no personal liability
   attaching to the ownership thereof.  First Federal does not have and is not
   bound by any outstanding subscriptions, options, warrants, calls,
   commitments or agreements of any character calling for the purchase or
   issuance of any shares of its capital stock or any other equity security of
   First Federal or any securities representing the right to purchase or
   otherwise receive any shares of capital stock or any other equity security
   of First Federal.

   3.3  AUTHORITY; NO VIOLATION.  

        (a)  Big Sky has full corporate power and authority to execute and
   deliver this Agreement and to consummate the transactions contemplated
   hereby.  The execution and delivery of this Agreement and the consummation
   of the transactions contemplated hereby have been duly and validly approved
   by the Board of Directors of Big Sky.  The Board of Directors of Big Sky
   has directed that this Agreement and the transactions contemplated hereby
   be submitted to Big Sky's stockholders for approval at a meeting of such
   stockholders and, except for the adoption of this Agreement by the
   requisite vote of Big Sky's stockholders pursuant to the Big Sky
   Certificate of Incorporation and the DGCL, no other corporate proceedings
   on the part of Big Sky (except for matters related to setting the date,
   time, place and record date for the said meeting) are necessary to approve
   this Agreement or to consummate the transactions contemplated hereby.  This
   Agreement has been duly and validly executed and delivered by Big Sky and
   (assuming due authorization, execution and delivery by Sterling of this
   Agreement) this Agreement constitutes a valid and binding obligation of Big
   Sky, enforceable against Big Sky in accordance with its terms, except as
   enforcement may be limited by general principles of equity whether applied
   in a court of law or a court of equity and by bankruptcy, insolvency and
   similar laws affecting creditors' rights and remedies generally.

        (b)  First Federal has full corporate or other power and authority to
   execute and deliver the Institution Merger Agreement and to consummate the
   transactions contemplated thereby.  The execution and delivery of the
   Institution Merger Agreement and the consummation of the transactions
   contemplated thereby will be duly and validly approved by the Board of
   Directors of First Federal, and by Big Sky as the sole stockholder of First
   Federal prior to the Effective Time.  All corporate proceedings on the part
   of First Federal necessary to consummate the transactions contemplated
   thereby will have been taken prior to the Effective Time.  The Institution
   Merger Agreement, upon execution and delivery by First Federal, will be
   duly and validly executed and delivered by First Federal and will (assuming
   due authorization, execution and delivery by Sterling Savings Association)

                                    9
<PAGE>


<PAGE>
   constitute a valid and binding obligation of First Federal, enforceable
   against First Federal in accordance with its terms, except as enforcement
   may be limited by general principles of equity whether applied in a 
   court of law or a court of equity and by bankruptcy, insolvency and similar
   laws affecting creditors' rights and remedies generally.  

        (c)  Neither the execution and delivery of this Agreement by Big Sky
   or the Institution Merger Agreement by First Federal, nor the consummation
   by Big Sky or First Federal, as the case may be, of the transactions
   contemplated hereby or thereby, nor compliance by Big Sky or First Federal
   with any of the terms or provisions hereof or thereof, will (i) violate any
   provision of the Certificate of Incorporation or Bylaws of Big Sky or the
   Charter or Bylaws of First Federal, or (ii) assuming that the consents and
   approvals referred to in Section 3.4 hereof are duly obtained, (x) violate
   any Laws applicable to Big Sky or First Federal, or any of their respective
   properties or assets, or (y) violate, conflict with, result in a breach of
   any provision of or the loss of any benefit under, constitute a material
   default (or an event which, with notice or lapse of time, or both, would
   constitute a default) under, result in the termination of or a right of
   termination or cancellation under, accelerate the performance required
   by, or result in the creation of any lien, pledge, security interest,
   charge or other encumbrance upon any of the respective properties or assets
   of Big Sky or First Federal under, any of the terms, conditions or
   provisions of any note, bond, mortgage, indenture, deed of trust, license,
   lease, agreement or other instrument or obligation to which Big Sky or
   First Federal is a party, or by which they or any of their respective
   properties or assets may be bound or affected.

        For the purposes of this Agreement, "Laws" shall mean any and all
   statutes, laws, ordinances, rules, regulations and other rules of law
   enacted, promulgated or issued by any Governmental Entity (as defined
   below). 

   3.4  CONSENTS AND APPROVALS.  

           (a)  Except for (i) the filing of applications and notices, as
   applicable, as to the Merger and the Institution Merger with the OTS under
   the HOLA and the Bank Merger Act and approval of such applications and
   notices, (ii) the filing with the SEC of a registration statement on Form
   S-4 to register the shares of Sterling Common Stock to be issued in
   connection with the Merger (including the shares of Sterling Common Stock
   that may be issued in connection with Options as provided  in Section 1.6
   hereof), which will include the proxy statement/prospectus (the "Proxy
   Statement/Prospectus") to be used in soliciting the requisite approval of
   Big Sky stockholders at a meeting of such stockholders (the "Big Sky
   Meeting") to be held in connection with this Agreement and the transactions
   contemplated hereby, (iii) the approval of this Agreement by the requisite
   vote of the stockholders of Big Sky pursuant to the Big Sky Certificate
   of Incorporation and the DGCL, (iv) the filing of the Certificate of Merger
   with the Secretary of State of Delaware pursuant to the DGCL and (v) the
   filings required in connection with the Institution Merger Agreement and
   the Institution Merger, no consents or approvals of or filings or
   registrations with any court, administrative

                                    10
<PAGE>

<PAGE>
   agency or commission or other governmental authority or instrumentality
   (each a "Governmental Entity"), or with any third party are necessary in
   connection with (1) the execution and delivery by Big Sky of this
   Agreement; (2) the consummation by Big Sky of the Merger and the other
   transactions contemplated hereby; (3) the execution and delivery by First
   Federal of the Institution Merger Agreement; and (4) the performance by
   First Federal of the Institution Merger Agreement and the transactions
   contemplated thereby, except, in each case, for such consents, approvals or
   filings, the failure of which to obtain will not have a material adverse
   effect on the ability to consummate the transactions contemplated hereby.  

        (b)  As of the date of this Agreement, Big Sky has no knowledge of any
   reason why approval or effectiveness of any of the applications, notices or
   filings referred to in Section 3.4(a) cannot be obtained or granted on a
   timely basis.

   3.5  LOAN PORTFOLIO; REPORTS.  

        (a)  Except as disclosed in Section 3.5(a) of the Big Sky Disclosure
   Schedule, neither Big Sky nor First Federal is a party to any written or
   oral loan agreement, note or borrowing arrangement (including, without
   limitation, leases, credit enhancements, commitments, guarantees and
   interest-bearing assets) (collectively, "Loans"), with any director,
   officer, employee or five percent or greater stockholder of Big Sky or
   First Federal, or any Affiliated Person of the foregoing.

        For the purposes of this Agreement, "Affiliated Person" shall mean
   director, executive officer or 5% or greater stockholder, spouse or other
   person living in the same household of such director, officer or
   stockholder, or any company, partnership or trust in which any of the
   foregoing persons is an officer, 10% or greater stockholder, general
   partner or 10% or greater trust beneficiary.  

           (b)  Since January 1, 1995 Big Sky and First Federal have timely
   filed all reports, registrations and statements, together with any
   amendments required to be made with respect thereto, that they have been
   required to file with (i) the OTS, (ii) the FDIC, (iii) the SEC and (iv)
   any self-regulatory organization ("SRO") (collectively "Regulatory
   Agencies").  As of its respective date, each such report, registration,
   statement and amendment complied in all material respects with all rules
   and regulations promulgated by the applicable Regulatory Agency and did not
   contain any untrue statement of a material fact or omit to state a material
   fact required to be stated therein or necessary in order to make the
   statements therein, in light of the circumstances under which they were
   made, not misleading.  Except for normal examinations conducted by a
   Regulatory Agency in the regular course of the business of Big Sky and
   First Federal, no Governmental Entity is conducting, or has conducted, any
   proceeding or investigation into the business or operations of Big Sky or
   First Federal since March 31, 1995.

                                    11
<PAGE>


<PAGE>
        3.6  FINANCIAL STATEMENTS; EXCHANGE ACT FILINGS; BOOKS AND
             RECORDS.  

        Big Sky has previously delivered to Sterling true, correct and
complete copies of (i) the audited consolidated balance sheets of Big Sky and
First Federal as of March 31 for the fiscal years 1996 and 1997 and the
related audited consolidated statements of income, stockholders' equity and
cash flows for the fiscal years 1995 through 1997, inclusive, as reported in
Big Sky's Annual Report on Form 10-KSB for the fiscal year ended March 31,
1997 filed with the SEC under the Securities Exchange Act of 1934, as amended
(the "Exchange Act"), in each case accompanied by the audit report of Deloitte
& Touche, LLP, independent public accountants with respect to Big Sky and (ii)
the unaudited consolidated balance sheets of Big Sky and First Federal as of
December 31, 1997 and 1996 and the related unaudited consolidated statements
of income, stockholders' equity and cash flows for the interim periods ended
December 31, 1997 and 1996, as reported on Big Sky's Quarterly Report on Form
10-QSB for the period ended December 31, 1997 filed with the SEC under the
Exchange Act.  Big Sky will deliver as soon as is reasonably practicable, a
draft of the consolidated balance sheet of Big Sky and First Federal as of
March 31, 1998 and the related consolidated statements of income,
stockholders' equity and cash flows for the fiscal year ended March 31, 1998, 
in the form Big Sky expects to file under the Exchange Act in connection with
its Form 10-KSB for the fiscal year ended March 31, 1998.  The financial
statements referred to in this Section 3.6 (including the related notes, where
applicable but excluding the draft statements referred to herein) fairly
present, and the financial statements referred to in Section 6.8 hereof will
fairly present (subject, in the case of the unaudited and draft statements, to
recurring audit adjustments normal in nature and amount), the results of the
consolidated operations and consolidated financial condition of Big Sky and
First Federal for the respective fiscal periods or as of the respective dates
therein set forth; each of such statements (including the related notes, where
applicable) comply, and the financial statements referred to in Section 6.8
hereof will comply, with applicable accounting requirements and with the
published rules and regulations of the SEC with respect thereto and each of
such statements (including the related notes, where applicable) has been, and
the financial statements referred to in Section 6.8 hereof will be prepared in
accordance with GAAP consistently applied during the periods involved, except
in each case as indicated in such statements or in the notes thereto or, in
the case of unaudited statements, as permitted by Form 10-QSB or, in the case
of draft statements, subject to revisions that in the aggregate will not be
material.  Big Sky's Annual Report on Form 10-KSB for the fiscal year ended
March 31, 1997 and all reports subsequently filed under the Exchange Act (the
"Big Sky Exchange Act Reports") comply in all material respects with the
appropriate requirements for such reports under the Exchange Act, and Big Sky
has previously delivered or made available to Sterling true, correct and
complete copies of such reports.  The books and records of Big Sky and First
Federal have been, and are being, maintained in all material respects in
accordance with GAAP and any other applicable legal and accounting
requirements.  

   3.7  BROKER'S FEES.  

   Neither Big Sky nor First Federal nor any of their respective officers or
directors has employed any broker or finder or incurred any liability for any
broker's fees, commissions or finder's

                                    12
<PAGE>


<PAGE>
fees in connection with any of the transactions contemplated by this Agreement
or the Institution Merger Agreement, except that Big Sky has engaged, and will
pay a fee to Feldman Financial Advisors, Inc. ("Feldman Financial") in
accordance with the terms of a letter agreement between Feldman and Big Sky,
dated October 17, 1997, a true, complete and correct copy of which is set
forth in Section 3.7 of the Big Sky Disclosure Schedule.  

   3.8  ABSENCE OF CERTAIN CHANGES OR EVENTS.  

        (a)  Except as disclosed in any Big Sky Exchange Act Report filed with
   the SEC prior to the date of this Agreement, since March 31, 1997 (i)
   neither Big Sky nor First Federal has incurred any material liability,
   except as contemplated by this Agreement or in the ordinary course of their
   business, (ii) neither Big Sky nor First Federal has discharged or
   satisfied any material lien or paid any material obligation or liability
   (absolute or contingent), other than in the ordinary course of business;
   (iii) neither Big Sky nor First Federal has sold, assigned, transferred,
   leased, exchanged or otherwise disposed of any of its material properties
   or assets other than in the ordinary course of business; (iv) neither Big
   Sky nor First Federal has suffered any material damage, destruction, or
   loss, whether as a result of fire, explosion, earthquake, accident,
   casualty, labor trouble, requisition or taking of property by any
   Regulatory Authority, flood, windstorm, embargo, riot, act of God or other
   casualty or event, whether or not covered by insurance; (v) neither Big Sky
   nor First Federal has cancelled or compromised any debt, except for debts
   charged off or compromised in accordance with the past practice of Big Sky
   or First Federal, as the case may be, and (vi) no event has occurred which
   has had or is reasonably certain to have, individually or in the aggregate,
   a material adverse effect on Big Sky.
   
        (b)  Since March 31, 1997, Big Sky and First Federal have carried on
   their respective businesses in the ordinary and usual course consistent
   with their past practices.

   3.9  LEGAL PROCEEDINGS.  

        (a)  Neither Big Sky nor First Federal is a party to any, and there
   are no pending or threatened, legal, administrative, arbitration or other
   proceedings, claims, actions or governmental or regulatory investigations
   of any nature against Big Sky or First Federal in which there is a
   reasonable probability of any material recovery against or other material
   adverse effect upon Big Sky or First Federal or which challenge the
   validity or propriety of the transactions contemplated by this Agreement or
   the Institution Merger Agreement as to which there is a reasonable
   probability of success.

        (b)  There is no injunction, order, judgment or decree imposed upon
   Big Sky, First Federal or the assets of Big Sky or First Federal.

                                    13
<PAGE>


<PAGE>
   3.10 TAXES AND TAX RETURNS.  

        (a)  Each of Big Sky and First Federal has duly filed all material
   Federal, state, local and foreign Tax Returns required to be filed by it on
   or prior to the date hereof (all such returns being accurate and complete
   in all material respects) and has duly paid or made provisions for the
   payment of all material Taxes which have been incurred or are due or
   claimed to be due from it by Federal, state, local and foreign taxing
   authorities on or prior to the date hereof.  All liability with respect to
   the income tax returns of Big Sky and First Federal has been satisfied for
   all years to and including fiscal year 1997.  The Internal Revenue Service
   ("IRS") has not notified Big Sky of, or otherwise asserted, that there are
   any material deficiencies with respect to the income tax returns of Big
   Sky.  There are no material disputes pending, or claims asserted for, Taxes
   or assessments upon Big Sky or First Federal, nor has Big Sky or First
   Federal been requested to give any waivers extending the statutory period
   of limitation applicable to any Federal, state or local income tax return
   for any period. 

        For the purposes of this Agreement, "Taxes" shall mean all taxes,
   charges, fees, levies, penalties or other assessments imposed by any United
   States federal, state, local or foreign taxing authority, including, but
   not limited to income, excise, property, sales, transfer, franchise,
   payroll, withholding, social security or other taxes, including any
   interest, penalties or additions attributable thereto.

        For purposes of this Agreement, "Tax Return" shall mean any return,
   report, information return or other document (including any related or
   supporting information) with respect to Taxes.

   3.11 EMPLOYEE PLANS.  

        (a)  Section 3.11(a) of the Big Sky Disclosure Schedule sets forth a
   true and complete list of each employee benefit plan (within the meaning of
   Section 3(3) of the Employee Retirement Income Security Act of 1974, as
   amended ("ERISA")), arrangement or agreement that is maintained or
   contributed to as of the date of this Agreement, or that has within the
   last six years been maintained or contributed to, by Big Sky or First
   Federal or any other entity which together with Big Sky would be deemed a
   "single employer" within the meaning of Section 4001 of ERISA or Code
   Sections 414(b), (c), (m) or (o) (an "ERISA Affiliate") or under which Big
   Sky or First Federal or any ERISA Affiliate has any liability
   (collectively, the "Plans").

        (b)  Section 3.11(b) of the Big Sky Disclosure Schedule sets forth
   true, correct and complete copies of each of the Plans and all related
   documents, including but not limited to (i) the actuarial report for such
   Plan (if applicable) for the last year, (ii) the most recent determination
   letter from the Internal Revenue Service (if applicable) for such Plan,
   (iii) the 

                                    14
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<PAGE>
   current summary plan description and any summaries of material
   modification, (iv) all annual reports (Form 5500 series) for each Plan
   filed for the preceding plan year, (v) all agreements with fiduciaries and
   service providers relating to the Plan, and (vi) all substantive
   correspondence relating to any such Plan addressed to or received from the
   Internal Revenue Service, the Department of Labor, the Pension Benefit
   Guaranty Corporation or any other governmental agency.

        (c)  Except as set forth at Section 3.11(c) of the Big Sky Disclosure
   Schedule, (i) each of the Plans has been operated and administered in all
   material respects in compliance with applicable Laws, including but not
   limited to ERISA and the Code, (ii) each of the Plans intended to be
   "qualified" within the meaning of Section 401(a) of the Code is so
   qualified, (iii) with respect to each Plan which is subject to Title IV of
   ERISA, the present value of accrued benefits under such Plan, based upon
   the actuarial assumptions used for funding purposes in the most recent
   actuarial report prepared by such Plan's actuary with respect to such Plan,
   did not, as of its latest valuation date, exceed the then current value of
   the assets of such Plan allocable to such accrued benefits, and there has
   not been a material adverse change in the financial condition of such
   Plans, (iv) no Plan provides benefits, including, without limitation, death
   or medical benefits (whether or not insured), with respect to current or
   former employees of Big Sky or First Federal beyond their retirement or
   other termination of service, other than (w) coverage mandated by
   applicable Law, (x) death benefits or retirement benefits under a Plan that
   is an "employee pension plan," as that term is defined in Section 3(2) of
   ERISA, (y) deferred compensation benefits under a Plan that are accrued as
   liabilities on the books of Big Sky or First Federal, or (z) benefits the
   full cost of which is borne by the current or former employee (or the
   employee's beneficiary), (v) Big Sky and First Federal have reserved the
   right to amend, terminate and modify any Plan providing post-retirement
   death or medical benefits, (vi) no material liability under Title IV of
   ERISA has been incurred by Big Sky, First Federal or any ERISA Affiliate
   that has not been satisfied in full, and no condition exists that
   presents a material risk to Big Sky or First Federal of incurring a
   material liability thereunder, (vii) none of Big Sky, First Federal or any
   ERISA Affiliate has incurred, and Big Sky does not expect that any such
   entity will incur, any withdrawal liability with respect to a
   "multiemployer pension plan" (as such term is defined in Section 3(37) of
   ERISA) under Title IV of ERISA, or any material liability in connection
   with the termination or reorganization of a multiemployer pension plan,
   (viii) all contributions or other amounts payable by Big Sky or First
   Federal as of the Effective Time with respect to each Plan and all other
   liabilities of each such entity with respect to each Plan in respect of
   current or prior plan years have been paid or accrued in accordance with
   generally accepted accounting practices and Section 412 of the Code, (ix)
   neither Big Sky nor First Federal has engaged in a transaction in
   connection with which Big Sky or First Federal is subject to either a
   material civil penalty assessed pursuant to Section 409 or 502(i) of ERISA
   or a material tax imposed pursuant to Section 4975 or 4976 of the Code, (x)
   to the knowledge of Big Sky, there are no pending, threatened or
   anticipated claims (other than routine claims for benefits) by, on
   behalf of or against any of the Plans or any trusts related thereto, (xi)
   no Plan, program, agreement or other arrangement, either individually or

                                    15
<PAGE>


<PAGE>
   collectively, provides for any payment by Big Sky or First Federal that
   would not be deductible under Code Sections 162(a)(1), 162(m) or 404 or
   that would constitute a "parachute payment" within the meaning of Code
   Section 280G, nor is there outstanding under any such Plan, program,
   agreement or arrangement, any limited stock appreciation right or any
   similar right or instrument that could reasonably be expected to prevent
   the Merger from being accounted for as a pooling-of-interests, (xii) no
   "accumulated funding deficiency," as defined in Section 302(a)(2) of ERISA
   or Section 412 of the Code, whether or not waived, and no "unfunded current
   liability," as determined under Section 412(l) of the Code, exists with
   respect to any Plan, and (xiii) no Plan has experienced a "reportable
   event" (as such term is defined in Section 4043(c) of ERISA) that is not
   subject to an administrative or statutory waiver from the reporting
   requirement.  

   3.12 CERTAIN CONTRACTS.  

        (a)  Except as set forth at Section 3.12 of the Big Sky Disclosure
   Schedule, neither Big Sky nor First Federal is a party to or bound by any
   contract, arrangement or commitment (i) with respect to the employment of
   any directors, officers, employees or consultants, (ii) which, upon the
   consummation of the transactions contemplated by this Agreement or the
   Institution Merger Agreement will (either alone or upon the occurrence of
   any additional acts or events) result in any payment (whether of severance
   pay or otherwise) becoming due from Sterling, Big Sky, First Federal,
   Sterling Savings Association or any of their respective Subsidiaries to any
   director, officer or employee thereof, (iii) which materially restricts the
   conduct of any line of business by Big Sky or First Federal, (iv) with or
   to a labor union or guild (including any collective bargaining agreement),
   (v) (including any stock option plan, stock appreciation rights plan,
   restricted stock plan or stock purchase plan) any of the benefits of
   which will be increased, or the vesting of the benefits of which will be
   accelerated, by the occurrence of any of the transactions contemplated by
   this Agreement or the Institution Merger Agreement, or the value of any of
   the benefits of which will be calculated on the basis of any of the
   transactions contemplated by this Agreement or the Institution Merger
   Agreement, (vi) that is material and is not made in the ordinary course of
   business or pursuant to which Big Sky or First Federal is or may become
   obligated to invest in or contribute capital to any entity, (vii) not fully
   disclosed in the financial statements contemplated by Section 3.6 that
   relates to borrowings of money (or guarantees thereof by Big Sky, or First
   Federal), other than in the ordinary course of business, or (viii) is a
   lease or similar arrangement with annual rental payments of $10,000 or
   more.  Section 3.12(a) of the Big Sky Disclosure Schedule sets forth true,
   correct and complete copies of all employment, consulting and deferred
   compensation agreements to which Big Sky or First Federal is a party.  No
   action taken or notice given as provided in Section 1.6 hereof will violate
   the terms of the Big Sky Option Plan, constitute a violation of any Laws or
   give rise to liability to any Option holder.  Section 3.12(a) of the Big
   Sky Disclosure Schedule sets forth a list of all material contracts (as
   defined in Item 601(b)(10) of Regulation S-K) of Big Sky.  Each contract,
   arrangement or commitment of the type described in this Section 3.12(a),
   whether or not set forth in Section 3.12(a) of the Big Sky Disclosure
   Schedule, is

                                    16
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<PAGE>
   referred to herein as a "Big Sky Contract," and neither Big Sky nor First
   Federal has received notice of, nor do any executive officers of such
   entities know of, any violation or imminent violation of any Big Sky
   Contract by any other party thereto.  

        (b)  (i) Each Big Sky Contract is a valid and binding commitment of
   Big Sky and is in full force and effect, (ii) each of Big Sky and First
   Federal has in all material respects performed all obligations required to
   be performed by it to date under each Big Sky Contract, and (iii) no event
   or condition exists which constitutes or, after notice or lapse of time or
   both, would constitute, a material default on the part of Big Sky or First
   Federal under any such Big Sky Contract.

   3.13 AGREEMENTS WITH REGULATORY AGENCIES.  

   Neither Big Sky nor First Federal is subject to any cease-and-desist or
other order issued by, or is a party to any written agreement, consent
agreement or memorandum of understanding with, or is a party to any commitment
letter or similar undertaking to, or is subject to any order or directive by,
or has been a recipient of any extraordinary supervisory letter from, or has
adopted any board resolutions at the request of (each, whether or not set
forth on Section 3.13 of the Big Sky Disclosure Schedule, a "Regulatory
Agreement"), any Governmental Entity that restricts the conduct of its
business or that in any manner relates to its capital adequacy, its credit
policies, its management or its business, nor has Big Sky or First Federal
been advised by any Governmental Entity that it is considering issuing or
requesting any Regulatory Agreement. 

   3.14 STATE TAKEOVER LAWS; CERTIFICATE OF INCORPORATION.  

   The Board of Directors of Big Sky has approved the offer of Sterling to
enter into this Agreement and the Institution Merger Agreement, and has
approved Big Sky's entering into this Agreement, the Institution Merger
Agreement, and the transactions contemplated thereby, such that under the DGCL
and Big Sky's Certificate of Incorporation the only vote of Big Sky
stockholders necessary to consummate the transactions contemplated hereby is
the approval of the holders of at least a majority of the outstanding Big Sky
Common Stock entitled to vote thereon at the Big Sky Meeting or any
adjournment or postponement thereof.  

   3.15 ENVIRONMENTAL MATTERS.  

        (a)  Each of Big Sky and First Federal is in compliance in all
   material respects with all applicable Laws relating to pollution or
   protection of the environment (including without limitation, laws and
   regulations relating to emissions, discharges, releases and threatened
   releases of Hazardous Material (as hereinafter defined)), or otherwise
   relating to the manufacture, processing, distribution, use, treatment,
   storage, disposal, transport or handling of Hazardous Materials;

                                    17
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<PAGE>
        (b)  There is no suit, claim, action, proceeding, investigation or
   notice pending or, to the knowledge of Big Sky's and First Federal's
   executive officers, threatened (or to the knowledge of Big Sky's and First
   Federal's executive officers past or present actions or events that could
   reasonably be expected to form the basis of any such suit, claim, action,
   proceeding, investigation or notice), in which Big Sky or First Federal has
   been or, with respect to threatened suits, claims, actions, proceedings,
   investigations or notices may be, named as a defendant (x) for alleged
   material noncompliance (including by any predecessor), with any
   environmental law, rule or regulation or (y) relating to any material
   release or threatened release into the environment of any Hazardous
   Material, whether or not occurring at or on a site owned, leased or
   operated (directly or indirectly in a fiduciary capacity) by Big Sky or
   First Federal; 

        (c)  To the knowledge of Big Sky's and First Federal's executive
   officers, there has not been any release of Hazardous Materials in, on,
   under or affecting any such property; 

        (d)  To the knowledge of Big Sky's and First Federal's executive
   officers, neither Big Sky nor First Federal has made or participated in any
   loan to any person who is subject to any suit, claim, action, proceeding,
   investigation or notice, pending or threatened, with respect to (i) any
   alleged material noncompliance as to any property securing such loan with
   any environmental law, rule or regulation, or (ii) the release or the
   threatened release into the environment of any Hazardous Material at any
   property securing such loan.

        (e)  For purposes of this section 3.15, the term "Hazardous Material"
   means any hazardous waste, petroleum product, polychlorinated biphenyl,
   chemical, pollutant, contaminant, pesticide, radioactive substance, lead
   paint or other toxic material, or other material or substance (in each such
   case, other than small quantities of such substances in retail containers)
   regulated under any applicable environmental or public health statute, law,
   ordinance, rule or regulation.  

   3.16 RESERVES FOR LOSSES.  

   All reserves or other allowances for possible losses reflected in Big Sky's
most recent financial statements referred to in Section 3.6 complied with all
Laws and are reported in accordance with GAAP.  Neither Big Sky nor First
Federal has been notified by the OTS, the FDIC, any other regulatory authority
or by Big Sky's independent auditor, in writing or otherwise, that such
reserves are inadequate or that the practices and policies of Big Sky or First
Federal in establishing such reserves and in accounting for delinquent and
classified assets generally fail to comply with applicable accounting or
regulatory requirements, or that the OTS, the FDIC, any other regulatory
authority or Big Sky's independent auditor believes such reserves to be
inadequate or inconsistent with the historical loss experience of Big Sky or
First Federal.  Section 3.16 of the Big Sky Disclosure Schedule sets forth a
complete list of all extensions of credit and other real estate owned ("OREO")
that have been classified by any regulatory examiner as other loans specially
mentioned, special mention, substandard, doubtful, loss, classified or
criticized, credit risk assets, concerned loans 

                                   18

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<PAGE>
or words of similar import.  All OREO, if any, held by Big Sky or First
Federal is being carried net of reserves at fair value.  

   3.17 PROPERTIES AND ASSETS.  

   Section 3.17 of the Big Sky Disclosure Schedule lists as of the date of
this Agreement (i) all real property owned by Big Sky and First Federal; (ii)
each real property lease, sublease or installment purchase arrangement to
which Big Sky or First Federal is a party; (iii) a description of each
contract for the purchase, sale, or development of real estate to which Big
Sky or First Federal is a party; and (iv) all items of Big Sky's or First
Federal's tangible personal property and equipment with a book value of
$10,000 or more or having any annual lease payment of $5,000 or more.  Except
for (a) items reflected in Big Sky's consolidated financial statements as of
March 31, 1997 referred to in Section 3.6 hereof, (b) exceptions to title that
do not interfere materially with Big Sky's or First Federal's use and
enjoyment of owned or leased real property (other than OREO), (c) liens for
current real estate taxes not yet delinquent, or being contested in good
faith, properly reserved against, (d) properties and assets sold or
transferred in the ordinary course of business consistent with past practices
since March 31, 1997, and (e) items listed in Section 3.17 of the Big Sky
Disclosure Schedule, Big Sky and First Federal have good and, as to owned real
property, marketable and insurable title to all their properties and assets,
reflected in the consolidated financial statements of Big Sky as of March 31,
1997, free and clear of all material liens, claims, charges and other
encumbrances.  Big Sky and First Federal, as lessees, have the right under
valid and subsisting leases to occupy, use and possess all property leased by
them.  All properties and assets used by Big Sky and First Federal are in good
operating condition and repair (subject to ordinary wear and tear) suitable
for the purposes for which they are currently utilized and, to the knowledge
of Big Sky, comply in all material respects with all Laws relating thereto now
in effect.  Big Sky and First Federal enjoy peaceful and undisturbed
possession under all leases for the use of all property under which they are
the lessees, and all leases to which Big Sky or First Federal is a party are
valid and binding obligations of Big Sky or First Federal in accordance with
the terms thereof.  Neither Big Sky nor First Federal is in material default
with respect to any such lease, and there has occurred no default by Big Sky
or First Federal or event which with the lapse of time or the giving of
notice, or both, would constitute a material default by Big Sky or First
Federal under any such lease.  To the knowledge of Big Sky, there are no Laws,
conditions of record, or other impediments which interfere with the intended
use by Big Sky or First Federal of any of the property owned, leased, or
occupied by them.  

   3.18 INSURANCE.  

   Section 3.18 of the Big Sky Disclosure Schedule contains a true, correct
and complete list of all insurance policies and bonds maintained by Big Sky
and First Federal, including the name of the insurer, the policy number, the
type of policy and any applicable deductibles.  The existing insurance carried
by Big Sky and First Federal is sufficient for compliance by Big Sky and First
Federal with all requirements of Law and agreements to which Big Sky or First
Federal is subject or is party.  True, correct and complete copies of all such
policies and bonds set forth in Section 3.18

                                    19
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<PAGE>
of the Big Sky Disclosure Schedule, as in effect on the date hereof, have been
delivered or made available to Sterling.  

   3.19 COMPLIANCE WITH APPLICABLE LAWS.  

   Each of Big Sky and First Federal has complied in all material respects
with all Laws applicable to it or to the operation of its business.  Neither
Big Sky nor First Federal has received any notice of any material alleged or
threatened claim, violation or liability under any such Laws that has not
heretofore been cured and for which there is no remaining liability. 

   3.20 LOANS.  

   As of the date hereof: 

        (a)  All loans owned by Big Sky or First Federal, or in which Big Sky
   or First Federal has an interest, comply in all material respects with all
   Laws, including, but not limited to, applicable usury statutes,
   underwriting and record keeping requirements and the Truth in Lending Act,
   the Equal Credit Opportunity Act and the Real Estate Settlement Procedures
   Act, and other applicable consumer protection statutes and the regulations
   thereunder.       

        (b)  All loans owned by Big Sky or First Federal, or in which Big Sky
   or First Federal has an interest, have been made or acquired by Big Sky in
   all material respects in accordance with board of director-approved loan
   policies.  Each of Big Sky and First Federal holds mortgages contained in
   its loan portfolio for its own benefit to the extent of its interest shown
   therein; such mortgages evidence liens having the priority indicated by
   their terms, subject, as of the date of recordation or filing of applicable
   security instruments, only to such exceptions as are discussed in
   attorneys' opinions regarding title or in title insurance policies in the
   mortgage files relating to the loans secured by real property or are not
   material as to the collectability of such loans; and all loans owned by Big
   Sky and First Federal are with full recourse to the borrowers, and each of
   Big Sky and First Federal has taken no action which would result in a
   waiver or negation of any rights or remedies available against the borrower
   or guarantor, if any, on any loan, other than in the ordinary course of
   business.  All applicable remedies against all borrowers and guarantors are
   enforceable except as may be limited by bankruptcy, insolvency, moratorium
   or other similar laws affecting creditors' rights and except as may be
   limited by the exercise of judicial discretion in applying principles of
   equity.  Except as set forth at Section 3.20(b) of the Big Sky Disclosure
   Schedule, all loans purchased or originated by Big Sky or First Federal and
   subsequently sold by Big Sky or First Federal have been sold without
   recourse to Big Sky or First Federal and without any liability under any
   yield maintenance or similar obligation.  True, correct and complete copies
   of

                                    20
<PAGE>


<PAGE>
   loan delinquency reports prepared by Big Sky and First Federal, which
   reports include all loans delinquent or otherwise in default, are set forth
   in Section 3.20(b) of the Big Sky Disclosure Schedule.  True, correct and
   complete copies of the currently effective lending policies of Big Sky and
   First Federal have been furnished or made available to Sterling.  

        (c)  Except as set forth in Section 3.20(c) of the Big Sky Disclosure
   Schedule, each outstanding loan participation sold by Big Sky or First
   Federal was sold with the risk of non-payment of all or any portion of that
   underlying loan to be shared by each participant (including Big Sky or
   First Federal) proportionately to the share of such loan represented by
   such participation without any recourse of such other lender or participant
   to Big Sky or First Federal for payment or repurchase of the amount of such
   loan represented by the participation or liability under any yield
   maintenance or similar obligation.  Each of Big Sky and First Federal has
   properly fulfilled in all material respects its contractual
   responsibilities and duties in any loan in which it acts as the lead lender
   or servicer and has complied in all material respects with its duties 
   as required under applicable regulatory requirements.  

        (d)  Each of Big Sky and First Federal has properly perfected or
   caused to be properly perfected all security interests, liens, or other
   interests in any collateral securing any loans made by it.

   3.21 FAIRNESS OPINION.  

   Big Sky has received an opinion from Feldman Financial dated as of the date
hereof to the effect that, in its opinion, the Exchange Ratio pursuant to this
Agreement is fair to the holders of Big Sky Common Stock from a financial
point of view.  

   3.22 TAX AND ACCOUNTING TREATMENT OF MERGER.  

   As of the date of this Agreement, Big Sky is not aware of any fact or state
of affairs relating to Big Sky that could cause the Merger not to be treated
as a "reorganization" under Section 368(a) of the Code or to qualify for
"pooling-of-interests" accounting treatment.  

   3.23 UNDISCLOSED LIABILITIES.  

   Except (i) for those liabilities that are fully reflected or reserved
against on the consolidated balance sheet of Big Sky included in the Big Sky
Form 10-QSB for the quarter ended December 31, 1997 or (ii) for liabilities
incurred in the ordinary course of business consistent with past practice
since December 31, 1997, neither Big Sky nor First Federal has incurred any
liability of any nature whatsoever (whether absolute, accrued or contingent or
otherwise and whether due or to become due) that, either alone or when
combined with all similar liabilities, has had, or would be reasonably
expected to have, a material adverse effect on Big Sky or First Federal.

                                    21
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 <PAGE>
   3.24 BIG SKY INFORMATION.  

   The information relating to Big Sky and First Federal to be provided by Big
Sky to be contained in the Proxy Statement/Prospectus and the Registration
Statement will not contain any untrue statement of a material fact or omit to
state a material fact necessary to make the statements therein, in light of
the circumstances in which they are made, not misleading and will comply in
all material respects with the provisions of the Exchange Act and the rules
and regulations thereunder.


                              ARTICLE IV 
               REPRESENTATIONS AND WARRANTIES OF STERLING
                                    
   Sterling, on behalf of itself and Sterling Savings Association, hereby
makes the following representations and warranties to Big Sky as set forth in
this Article IV, each of which is being relied upon by Big Sky as a material
inducement to enter into and perform this Agreement.  

   4.1  CORPORATE ORGANIZATION.  

        (a)  Sterling is a corporation duly organized, validly existing and in
   good standing under the laws of the State of Washington.  Sterling has the
   corporate power and authority to own or lease all of its properties and
   assets and to carry on its business as it is now being conducted, and is
   duly licensed or qualified to do business in each jurisdiction in which the
   nature of the business conducted by it or the character or location of the
   properties and assets owned or leased by it makes such licensing or
   qualification necessary.  Sterling is duly registered as a savings and loan
   holding company with the OTS under HOLA.  The Restated Certificate of
   Incorporation and Bylaws of Sterling, copies of which have previously been
   made available to Big Sky, are true, correct and complete copies of such
   documents as in effect as of the date of this Agreement.

        (b)  Sterling Savings Association is a Washington State chartered
   savings and loan association duly organized, validly existing and in good
   standing under the laws of the State of Washington.  The deposit accounts
   of Sterling are insured by the FDIC through the SAIF to the fullest extent
   permitted by law, and all premiums and assessments required in connection
   therewith have been paid by Sterling.  Sterling Savings Association has the
   corporate power and authority to own or lease all of its properties and
   assets and to carry on business as is now being conducted, and is duly
   licensed or qualified to do business in each jurisdiction in which the
   nature of the business conducted by it or the character or location of the
   properties and assets owned or leased by it makes such licensing or
   qualification necessary.  The Charter and Bylaws of Sterling Savings
   Association, copies of which have previously been made available to Big
   Sky, are true, correct and complete copies of such documents as in effect
   as of the date of this Agreement.

                                    22
<PAGE>

  
<PAGE>
   4.2  CAPITALIZATION.  

           (a)  The authorized capital stock of Sterling as of the date hereof
   consists of 20,000,000 shares of Sterling Common Stock, of which 7,569,791
   shares were outstanding at December 31, 1997 and 10,000,000 shares of
   preferred stock, par value $1.00 per share ("Sterling Preferred Stock"), no
   shares of which were outstanding at December 31, 1997.  At such date, there
   were options outstanding to purchase 480,790 shares of Sterling Common
   Stock.  All of the issued and outstanding shares of Sterling Common Stock
   have been duly authorized and validly issued and are fully paid,
   nonassessable and free of preemptive rights, with no personal liability
   attaching to the ownership thereof.  As of the date of this Agreement,
   except as set forth above, Sterling does not have and is not bound by any
   outstanding subscriptions, options, warrants, calls, commitments or
   agreements of any character calling for the purchase or issuance of any
   shares of Sterling Common Stock or Sterling Preferred Stock or any other
   equity securities of Sterling or any securities representing the right to
   purchase or otherwise receive any shares of Sterling Common Stock or
   Sterling Preferred Stock.

        (b)  The authorized capital stock of Sterling Savings Association
   consists of 9,000,000 shares of common stock, par value $1.00 per share,
   4,758,743 of which are issued and outstanding, and 1,000,000 shares of
   preferred stock, par value $1.00 per share, of which 661 shares are issued
   or outstanding.  The outstanding shares of common stock of Sterling Savings
   Association are owned by Sterling free and clear of all liens, charges,
   encumbrances and security interests whatsoever, and all of such shares are
   duly authorized and validly issued and fully paid, nonassessable and free
   of preemptive rights, with no personal liability attaching to ownership
   thereof.  Notwithstanding the previous sentence, all of the issued and
   outstanding shares of the common and preferred stock of Sterling Savings
   are pledged to Key Bank as security for its loans to Sterling.

   4.3  AUTHORITY; NO VIOLATION. 

        (a)  Sterling has full corporate power and authority to execute and
   deliver this Agreement and to consummate the transactions contemplated
   hereby.  The execution and delivery of this Agreement and the consummation
   of the transactions contemplated hereby have been duly and validly approved
   by the Board of Directors of Sterling.  No other corporate proceedings on
   the part of Sterling are necessary to consummate the transactions
   contemplated hereby.  This Agreement has been duly and validly executed and
   delivered by Sterling and (assuming due authorization, execution and
   delivery by Big Sky) this Agreement constitutes a valid and binding
   obligation of Sterling, enforceable against Sterling in accordance with its
   terms, except as enforcement may be limited by general principles of equity
   whether applied in a court of law or a court of equity and by bankruptcy,
   insolvency and similar laws affecting creditors' rights and remedies
   generally.

                                   23
<PAGE>


<PAGE>
        (b)  Sterling Savings Association has full corporate power and
   authority to execute and deliver the Institution Merger Agreement and to
   consummate the transactions contemplated thereby.  The execution and
   delivery of the Institution Merger Agreement and the consummation of the
   transactions contemplated thereby will be duly and validly approved by the
   Board of Directors of Sterling Savings Association, and by Sterling as the
   sole stockholder of Sterling Savings Association prior to the Effective
   Time.  All corporate proceedings on the part of Sterling Savings
   Association necessary to consummate the transactions contemplated thereby
   will have been taken prior to the Effective Time.  The Institution Merger
   Agreement, upon execution and delivery by Sterling Savings Association,
   will be duly and validly executed and delivered by Sterling Savings
   Association and will (assuming due authorization, execution and delivery by
   First Federal) constitute a valid and binding obligation of Sterling
   Savings Association, enforceable against Sterling Savings Association in
   accordance with its terms, except as enforcement may be limited by general
   principles of equity whether applied in a court of law or a court of equity
   and by bankruptcy, insolvency and similar laws affecting creditors' rights
   and remedies generally.  

        (c)  Neither the execution and delivery of this Agreement by Sterling
   or the Institution Merger Agreement by Sterling Savings Association, nor
   the consummation by Sterling or Sterling Savings Association, as the case
   may be, of the transactions contemplated hereby or thereby, nor compliance
   by Sterling or Sterling Savings Association, as the case may be, with any
   of the terms or provisions hereof or thereof, will (i) violate any
   provision of the Restated Certificate of Incorporation or Bylaws of
   Sterling or the Charter or Bylaws of Sterling Savings Association, or (ii)
   assuming that the consents and approvals referred to in Section 4.4 are
   duly obtained, (x) violate any Laws applicable to Sterling or Sterling
   Savings Association or any of their respective properties or assets, or (y)
   violate, conflict with, result in a material breach of any provision of or
   the loss of any benefit under, constitute a default (or an event which,
   with notice or lapse of time, or both, would constitute a default) under,
   result in the termination of or a right of termination or cancellation
   under, accelerate the performance required by, or result in the creation of
   any lien, pledge, security interest, charge or other encumbrance upon any
   of the respective properties or assets of Sterling or Sterling Savings
   Association under any of the terms, conditions or provisions of any note,
   bond, mortgage, indenture, deed of trust, license, lease, agreement or
   other instrument or obligation to which Sterling or Sterling Savings
   Association is a party, or by which they or any of their respective
   properties or assets may be bound or affected.

   4.4  CONSENTS AND APPROVALS.  

        (a)  Except for (i) the filing of applications and notices, as
   applicable, as to the Merger and the Institution Merger with the OTS under
   HOLA and the Bank Merger Act and approval of such applications and notices,
   (ii) the filing with the SEC of a registration statement on Form S-4 to
   register the shares of Sterling Common Stock to be issued in connection
   with the Merger which will include the Proxy Statement/Prospectus, (iii)
   the approval of this Agreement by the requisite vote of the stockholders of
   Big Sky pursuant to

                                    24
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<PAGE>
   the Big Sky Certificate of Incorporation and the DGCL, (iv) the filing of
   the Articles of Merger with the Secretary of State of Washington pursuant
   to the WBCA, (v) the filings in connection with the Institution Merger
   Agreement and the transactions contemplated thereby and (vi) such filings
   and approvals as are required to be made or obtained under the securities
   or "Blue Sky" laws of various states or with Nasdaq (or such other exchange
   as may be applicable) in connection with the issuance of the shares of
   Sterling Common Stock pursuant to this Agreement, no consents or approvals
   of or filings or registrations with any Governmental Entity are necessary
   in connection with (1) the execution and delivery by Sterling of this
   Agreement; (2) the performance by Sterling of this Agreement and the 
   transactions contemplated hereby; (3) the execution and delivery by
   Sterling Savings Association of the Institution Merger Agreement; and (4)
   the consummation by Sterling Savings Association of the transactions
   contemplated by the Institution Merger Agreement except, in each case, for
   such consents, approvals or filings the failure of which to obtain will not
   have a material adverse effect on the ability to consummate the
   transactions contemplated hereby.  

        (b)  As of the date of this Agreement, Sterling has no knowledge of
   any reason why approval or effectiveness of any of the applications,
   notices or filings referred to in Section 4.4(a) cannot be obtained or
   granted on a timely basis. 

   4.5  REPORTS

   Since January 1, 1995 Sterling and Sterling Savings Association have timely
filed all reports, registrations and statements, together with any amendments
required to be made with respect thereto, that they have been required to file
with any Regulatory Agencies.  As of its respective date, each such report,
registration, statement and amendment complied in all material respects with
all rules and regulations promulgated by the applicable Regulatory Agency and
did not contain any untrue statement of a material fact or omit to state a
material fact required to be stated therein or necessary in order to make the
statements therein, in light of the circumstances under which they were made,
not misleading.  Except for normal examinations conducted by a Regulatory
Agency in the regular course of the business of Sterling and its Subsidiaries,
no Governmental Entity is conducting, or has conducted, any proceeding or
investigation into the business or operations of Sterling since December 31,
1993.  

   4.6  FINANCIAL STATEMENTS; EXCHANGE ACT FILINGS; BOOKS AND
        RECORDS. 

   Sterling has previously delivered to Big Sky true, correct and complete
copies of (i) the audited consolidated balance sheets of Sterling and its
Subsidiaries as of December 31, 1996 and 1997 and June 30, 1996 and the
related consolidated statements of income, changes in shareholders' equity and
cash flows for the year ended December 31, 1997, the six months ended December
31, 1996 and the years ended June 30, 1996 and 1995, inclusive, as reported in
Sterling's Annual Report on Form 10-K for the fiscal year ended December 31,
1997 filed with the SEC under the Exchange

                                    25
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<PAGE>
Act, in each case accompanied by the audit report of Coopers & Lybrand, LLP,
independent public accountants with respect to Sterling; and (ii) the
unaudited consolidated balance sheets of Sterling and its Subsidiaries as of
September 30, 1997 and December 31, 1996 and the related unaudited
consolidated statements of income, changes in shareholders' equity and cash
flows for the interim periods ended September 30, 1997 and 1996, as reported
on Sterling's Quarterly Report on Form 10-Q for the period ended September 30,
1997 filed with the SEC under the Exchange Act.  The financial statements
referred to in this Section 4.5 (including the related notes, where
applicable) fairly present, and the financial statements referred to in
Section 6.8 hereof will fairly present (subject, in the case of the unaudited
statements, to recurring audit adjustments normal in nature and amount), the
results of the consolidated operations and consolidated financial condition of
Sterling and its Subsidiaries for the respective fiscal periods or as of the
respective dates therein set forth; each of such statements (including the
related notes, where applicable) comply, and the financial statements referred
to in Section 6.8 hereof will comply, with applicable accounting requirements
and with the published rules and regulations of the SEC with respect thereto;
and each of such statements (including the related notes, where applicable)
has been, and the financial statements referred to in Section 6.8 hereof will
be, prepared in accordance with GAAP consistently applied during the periods
involved, except as indicated in the notes thereto or, in the case of
unaudited statements, as permitted by Form 10-Q.  Sterling's Annual Report on
Form 10-K for the fiscal year ended December 31, 1997 and all subsequently
filed reports under the Exchange Act comply in all material respects with the
appropriate requirements for such reports under the Exchange Act, and Sterling
has previously delivered or made available to Big Sky true, correct and
complete copies of such reports.  The books and records of Sterling and
Sterling Savings Association have been, and are being, maintained in all
material respects in accordance with GAAP and any other applicable legal and
accounting requirements and reflect only actual transactions.  

   4.7  ABSENCE OF CERTAIN CHANGES OR EVENTS.  

        (a)  Except as disclosed in Sterling's Annual Report on Form 10-K for
   the fiscal year ended December 31, 1997 and all reports subsequently filed
   by Sterling under the Exchange Act, true, correct and complete copies of
   which have previously been delivered or made available to Big Sky, since
   December 31, 1997, no event has occurred which has had, or is reasonably
   certain to have, individually or in the aggregate, a material adverse
   effect on Sterling.  

        (b)  Since June 30, 1997, Sterling and its Subsidiaries have carried
   on their respective businesses in the ordinary and usual course consistent
   with their past practices.
  
   4.8  COMPLIANCE WITH APPLICABLE LAW.  

   Sterling and each Sterling Subsidiary has complied in all material respects
with all Laws applicable to it or to the operation of its business.  Neither
Sterling nor any Sterling Subsidiary has received any notice of any material
alleged or threatened claim, violation of or liability under any such Laws
that has not heretofore been cured and for which there is no remaining
liability.

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<PAGE>
   4.9  EMPLOYEE PLANS.  

   Sterling has heretofore made available for inspection, or delivered (if
requested) to Big Sky true, correct and complete copies of each employee
benefit plan arrangement or agreement that is maintained as of the date of
this Agreement (the "Sterling Plans") by Sterling or any of its Subsidiaries. 
No "accumulated funding deficiency" as defined in Section 302(a)(2) of ERISA
or Section 412 of the Code, whether or not waived, and no "unfunded current
liability" as determined under Section 412(l) of the Code exists with respect
to any Sterling Plan.  The Sterling Plans are in compliance in all material
respects with the applicable requirements of ERISA and the Code.  

   4.10 AGREEMENTS WITH REGULATORY AGENCIES.  

   Neither Sterling nor any of its affiliates is subject to any
cease-and-desist or other order issued by, or is a party to any written
agreement, consent agreement or memorandum of understanding with, or is a
party to any commitment letter or similar undertaking to, or is subject to any
order or directive by, or has been a recipient of any extraordinary
supervisory letter from, or has adopted any board resolutions at the request
of (each a "Regulatory Agreement"), any Governmental Entity that restricts the
conduct of its business or that in any manner relates to its capital adequacy,
its credit policies, its management or its business, nor has Sterling or
Sterling Savings Association been advised by any Governmental Entity that it
is considering issuing or requesting any Regulatory Agreement.  

   4.11 TAX AND ACCOUNTING TREATMENT OF MERGER.  

   As of the date of this Agreement, Sterling is not aware of any fact or
state of affairs relating to Sterling that could cause the Merger not to be
treated as a "reorganization" under Section 368(a) of the Code or to qualify
for"pooling-of-interests" accounting treatment.  

   4.12 LEGAL PROCEEDINGS.  

        (a)  Neither Sterling nor any of its Subsidiaries is a party to any,   
 and there are no pending or threatened, legal, administrative, arbitration    
or other proceedings, claims, actions or governmental or regulatory    
investigations of any nature against Sterling or any of its Subsidiaries in    
which there is a reasonable probability of any material recovery against or    
other material adverse effect upon Sterling or any of its Subsidiaries or     
which challenge the validity or propriety of the transactions contemplated     
by this Agreement or the Institution Merger Agreement as to which there is    
a reasonable probability of success.  

         (b)  There is no injunction, order, judgment or decree imposed upon
   Sterling, any of its Subsidiaries or the assets of Sterling or any of its
   Subsidiaries.  
                                 27

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<PAGE>
   4.13 RESERVES FOR LOSSES.  

   All reserves or other allowances for possible losses reflected in
Sterling's most recent financial statements referred to in Section 4.5
complied with all Laws and are reported in accordance with GAAP.  Neither
Sterling nor Sterling Savings Association has been notified by the OTS, the
FDIC, any other regulator authority or by Sterling's independent auditor, in
writing or otherwise, that the reserves or other allowances for possible loan
losses reflected in Sterling's most recent financial statements referred to in
Section 4.5 are inadequate or that the practices and policies of Sterling or
Sterling Savings Association in establishing such reserves and in accounting
for delinquent and classified assets generally fail to comply with applicable
accounting or regulatory requirements or that the OTS, the FDIC, any other
regulatory authority or Sterling's independent auditor believes such reserves
to be inadequate or inconsistent with the historical loss experience of
Sterling or Sterling Savings Association.  Sterling has previously furnished
Big Sky with a complete list of all extensions of credit or OREO that have
been classified by any bank examiner (regulatory or internal) as other loans
specially mentioned, special mention, substandard, doubtful, loss, classified
or criticized, credit risk assets, concerned loans or words of similar import. 
All OREO held by Sterling or Sterling Savings Association is being carried net
of reserves at fair value.  

   4.14 BROKER'S FEES.  

   Neither Sterling nor any Sterling Subsidiary nor any of their respective
officers or directors has employed any broker or finder or incurred any
liability for any broker's fees, commissions or finder's fees in connection
with any of the transactions contemplated by this Agreement or the Institution
Merger Agreement.

   4.15 TAXES.  

   Each of Sterling and its Subsidiaries has duly filed all material Federal,
state, local and foreign Tax Returns required to be filed by it on or prior to
the date hereof (all such returns being accurate and complete in all material
respects) and has duly paid or made provisions for the payment of all material
Taxes which have been incurred or are due or claimed to be due from it by
Federal, state, local and foreign taxing authorities on or prior to the date
hereof.  All liability with respect to the income tax returns of Sterling and
its Subsidiaries has been satisfied for all years to and including June 30,
1997.  The IRS has not notified Sterling of, or otherwise asserted, that there
are any material deficiencies with respect to the income tax returns of
Sterling.  There are no material disputes pending, or claims asserted for,
Taxes or assessments upon Sterling or any of its Subsidiaries, nor has
Sterling or any of its Subsidiaries been requested to give any waivers
extending the statutory period of limitation applicable to any Federal, state
or local income tax return for any period.  

                                    28
<PAGE>

<PAGE>
   4.16 STERLING INFORMATION.  

   The information relating to Sterling and its Subsidiaries to be provided by
Sterling to be contained in the Proxy Statement/Prospectus and the
Registration Statement will not contain any untrue statement of a material
fact or omit to state a material fact necessary to make the statements
therein, in light of the circumstances in which they are made, not misleading. 
The Proxy Statement/Prospectus (except for such portions thereof that relate
only to Big Sky or First Federal) will comply in all material respects with
the provisions of the Exchange Act and the rules and regulations thereunder. 
The Registration Statement will comply in all material respects with the
provisions of the Securities Act and the rules and regulations thereunder.  

                               ARTICLE V 
               COVENANTS RELATING TO CONDUCT OF BUSINESS
                                    
   5.1  COVENANTS OF BIG SKY.  

   During the period from the date of this Agreement and continuing until the
Effective Time, except as expressly contemplated or permitted by this
Agreement or the Institution Merger Agreement, or with the prior written
consent of Sterling, Big Sky and First Federal shall carry on their respective
businesses in the ordinary course consistent with past practices and
consistent with prudent banking practices.  Big Sky will use its reasonable
best efforts to (x) preserve its business organization and that of First
Federal intact, (y) keep available to itself and Sterling the present services
of the employees of Big Sky and First Federal and (z) preserve for itself and
Sterling the goodwill of the customers of Big Sky and First Federal and others
with whom business relationships exist.  Without limiting the generality of
the foregoing, and except as set forth in the Big Sky Disclosure Schedule or
as otherwise contemplated by this Agreement or consented to by Sterling in
writing, Big Sky shall not, and shall not permit First Federal to: 

        (a)  declare or pay any dividends, on or make other distributions      
   in respect of, any of its capital stock;

        (b)  (i) split, combine or reclassify any shares of its capital stock
   or issue, authorize or propose the issuance of any other securities in
   respect of, in lieu of or in substitution for shares of its capital stock
   except upon the exercise or fulfillment of rights or options issued and
   outstanding as of the date hereof pursuant to the Big Sky Stock Option
   Plan in accordance with their present terms, or (ii) repurchase, redeem or
   otherwise acquire any shares of the capital stock of Big Sky or First
   Federal, or any securities convertible into or exercisable for any shares
   of the capital stock of Big Sky or First Federal;

        (c)  issue, deliver or sell, or authorize or propose the issuance,
   delivery or sale of, any shares of its capital stock or any securities
   convertible into or exercisable for, or any rights, warrants or options to
   acquire, any such shares, or enter into any agreement with

                                    29
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<PAGE>
   respect to any of the foregoing, other than the issuance of Big Sky Common
   Stock pursuant to stock options or similar rights to acquire Big Sky
   Common Stock granted pursuant to the Big Sky Stock Option Plan and
   outstanding prior to the date of this Agreement, in each case in     
   accordance with their present terms;

      (d)  amend its Certificate of Incorporation, Bylaws or other similar
   governing documents; 

      (e)  authorize or permit any of its officers, directors, employees or
   agents to, directly or indirectly, solicit, initiate or encourage any    
   inquiries relating to, or the making of any proposal from, hold discussions 
   or negotiations with or provide any information to, any person, entity or
   group (other than Sterling) concerning any Acquisition Transaction (as    
   defined below); provided, however, that Big Sky may, and may authorize and  
   permit its officers, directors, employees or agents to, provide or cause to 
   be provided information and may participate in such discussions or    
   negotiations if the Board of Directors of Big Sky has determined in good    
   faith that the failure to provide such information or participate in such   
   negotiations or discussions could cause the members of such Board of    
   Directors to breach their fiduciary duties under applicable Laws and the    
   Board of Directors has received the written advice of outside counsel to    
   that effect.  Big Sky shall promptly communicate orally (within one day)    
   and in writing (as promptly as practicable) to Sterling the material terms  
   of any proposal, whether written or oral, which it may receive in respect   
   of any such Acquisition Transaction and whether it is having discussions or 
   negotiations with a third party about an Acquisition Transaction or    
   providing information in connection with, or which may lead to, an    
   Acquisition Transaction with a third party.  Big Sky will promptly cease    
   and cause to be terminated any existing activities, discussions or    
   negotiations previously conducted with any parties other than Sterling with 
   respect to any of the foregoing.  As used in this Agreement, "Acquisition   
   Transaction" shall mean any offer, proposal or expression of interest    
   relating to (i) any tender or exchange offer involving Big Sky or First    
   Federal, (ii) merger, consolidation or other business combination involving 
   Big Sky or First Federal, or (iii) the acquisition in any manner of a       
   substantial equity interest in, or a substantial portion of the assets, out 
   of the ordinary course of business, of, Big Sky or First Federal other than 
   the transactions contemplated or permitted by this Agreement and the    
   Institution Merger Agreement; 

        (f)  make capital expenditures aggregating in excess of $10,000.

        (g)  enter into any new line of business; 

        (h)  acquire or agree to acquire, by merging or consolidating with, or 
   by purchasing an equity interest in or the assets of, or by any other    
   manner, any business or any corporation, partnership, association or other  
   business organization or division thereof or otherwise acquire any assets,  
   other than in connection with foreclosures, settlements in lieu

                                    30
<PAGE>


<PAGE>
   of foreclosure or troubled loan or debt restructurings, or in the ordinary  
   course of business consistent with past practices; 

        (i)  take any action that is intended or may reasonably be expected to
   result in any of its representations and warranties set forth in this    
   Agreement being or becoming untrue or in any of the conditions to the    
   Merger set forth in Article VII not being satisfied, or in a violation of   
   any provision of this Agreement or the Institution Merger Agreement,
   except, in every case, as may be required by applicable Law; 

        (j)  change its methods of accounting in effect at December 31, 1997   
   except as required by changes in GAAP or regulatory accounting principles   
   as concurred to by Big Sky's independent auditors; 

        (k)  (i) except as required by applicable law or to maintain    
   qualification pursuant to the Code, adopt, amend, renew or terminate any    
   Plan or any agreement, arrangement, plan or policy between Big Sky or First 
   Federal and one or more of its current or former directors, officers or   
   employees, (ii) other than normal annual increases in pay, consistent with  
   past practice, for employees not subject to an employment, change of    
   control or severance agreement, increase in any manner the compensation of  
   any employee or director or pay any benefit not required by any Plan or    
   agreement as in effect as of the date hereof (including, without    
   limitation, the granting of stock options, stock appreciation rights,    
   restricted stock, restricted stock units or performance units or shares),   
   (iii) enter into, modify or renew any contract, agreement, commitment or    
   arrangement providing for the payment to any director, officer or employee  
   of compensation or benefits, other than normal annual increases in pay,    
   consistent with past practice, for employees not subject to an employment,  
   change of control or severance agreement, (iv) hire any new employee at an  
   annual compensation in excess of $25,000, (v) pay expenses of any employees 
   or directors for attending conventions or similar meetings which    
   conventions or meetings are held after the date hereof, (vi) promote to a   
   rank of vice president or more senior any employee, or (vii) pay any    
   retention or other bonuses to any employees; 

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

         (m)  sell, purchase, enter into a lease, relocate, open or close any
   banking or other office, or file an application pertaining to such action   
   with any Governmental Entity; 

         (n)  make any equity investment or commitment to make such an    
   investment in real estate or in any real estate development project, other  
   than in connection with foreclosure, settlements in lieu of foreclosure, or 
   troubled loan or debt restructuring, in the ordinary course of business    
   consistent with past practices; 

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<PAGE>


<PAGE>
        (o)  make any new loans to, modify the terms of any existing loan to,  
   or engage in any other transactions (other than routine banking    
   transactions) with, any Affiliated Person of Big Sky or First Federal;

        (p)  make any investment, or incur deposit liabilities, other than in  
   the ordinary course of business consistent with past practices, or make any 
   equity investments;

        (q)  purchase any loans or sell, purchase or lease any real property,
   except for the sale of real estate that is the subject of a casualty loss   
   or condemnation or the sale of OREO on a basis consistent with past    
   practices; 

        (r)  originate (i) any loans except in accordance with existing First
   Federal lending policies, (ii) unsecured consumer loans in excess of    
   $25,000, (iii) commercial real estate first mortgage or other commercial    
   loans in excess of $150,000 as to any loan or $750,000 in the aggregate as  
   to related loans, or loans to related persons, or (iv) land acquisition    
   loans to borrowers who intend to construct a residence on such land in    
   excess of the lesser of 75% of the appraised value of such land or    
   $100,000, except in each case for (A) loans for which written commitments   
   have been issued by First Federal as of the date hereof, (B) renewals of    
   loans existing as of the date of this Agreement or loans permitted pursuant 
   to this Section 5.1(r) and (C) increases in the principal amount of loans   
   existing as of the date of this Agreement, subject to a limit of 30% of the 
   principal amount of such loans as of the date of this Agreement or    
   $100,000, whichever is less;  

        (s)  make any investments in excess of $1,000,000, in the aggregate,   
   in any equity or derivative securities or engage in any forward commitment, 
   futures transaction, financial options transaction, hedging or arbitrage    
   transaction or covered asset trading activities or make any investments in  
   any investment security with a maturity of greater than five years; 

        (t)  sell or purchase any mortgage loan servicing rights;

        (u)  agree or commit to do any of the actions set forth in clauses (a) 
   - (t) of this Section 5.1.  The consent of Sterling to any action by Big    
   Sky or First Federal that is not permitted by any of the preceding    
   paragraphs shall be evidenced only by a writing signed by the President or  
   any Executive or Senior Vice President of Sterling; or

        (v)  take or omit to take any other action that would materially    
   adversely affect or materially delay the ability of Big Sky to obtain the   
   Requisite Regulatory Approvals or otherwise materially adversely affect Big 
   Sky's and First Federal's ability to consummate the transactions    
   contemplated by this Agreement.  

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<PAGE>
   5.2  COVENANTS OF STERLING.  

   During the period from the date of this Agreement and continuing until the
Effective Time, except as expressly contemplated or permitted by this
Agreement or with Big Sky's prior written consent, Sterling shall not, and
shall not permit Sterling Savings Association to: 

        (a)  take any action that will result in any of Sterling's
   representations and warranties set forth in this Agreement being or    
   becoming untrue or any of the conditions to the Merger set forth in Article 
   VII not being satisfied or in a violation of any provision of this    
   Agreement or the Institution Merger Agreement, except, in every case, as    
   may be required by applicable Law; or 

        (b)  take or omit to take any other action that would materially    
   adversely affect or materially delay the ability of Sterling to obtain the  
   Requisite Regulatory Approvals or otherwise materially adversely affect    
   Sterling's and Sterling Savings Association's ability to consummate the    
   transactions contemplated by this Agreement.  

   5.3  MERGER COVENANTS.  

   Notwithstanding that Big Sky believes that it has established all reserves
and taken all provisions for possible loan losses required by GAAP and
applicable Laws, Big Sky recognizes that Sterling may have adopted different
loan, accrual and reserve policies (including loan classifications and levels
of reserves for possible loan losses).  In that regard, and in general, from
and after the date of this Agreement to the Effective Time, Big Sky and
Sterling shall consult and cooperate with each other in order to formulate the
plan of integration for the Merger, including, among other things, with
respect to conforming immediately prior to the Effective Time, based upon such
consultation, Big Sky's loan, accrual and reserve policies to those policies
of Sterling to the extent consistent with GAAP; provided, that any change in
Big Sky's policies in connection with such matters need not be effected until
Sterling irrevocably agrees in writing that (i) all conditions to Sterling's
obligation to consummate the Merger have been satisfied, (ii) that Sterling
will waive any and all rights that it may have to terminate this Agreement and
(iii) Sterling will complete the Merger.  

   5.4  EMPLOYMENT AND OTHER AGREEMENTS.  

   Following the Merger, Sterling agrees that it shall honor the existing
written contracts with officers of Big Sky and First Federal that are listed
at Section 3.12 of the Big Sky Disclosure Schedule; provided, however, that in
making the foregoing agreement, Sterling will honor such contracts only to the
extent that the payments of benefits to be provided under such contracts, when
taken together with any other payments to be received by such persons, would
not constitute a "parachute payment" within the meaning of Code Section
280G(b)(2).  Sterling further agrees that, prior to the Effective Time, the
employment agreements listed at Section 3.12 of the Big Sky Disclosure
Schedule, shall be amended to provide the (A) in the event, the payments and
benefits to be provided to an officer shall, in the aggregate, constitute a
parachute payment within the meaning of Section 280G(b)(2) of the Code, the
payments and benefits 

                                33
<PAGE>


<PAGE>
to be provided to the officer under the employment agreement shall, at the
officer's written election, (i) be payable or provided to the officer over a
period sufficient to reduce the present value of such payments or benefits
(determined in accordance with Treasury regulations under Section 280G of the
Code) to an amount which is 2.99 times the Officer's "base amount" under
Section 280G(b)(3) of the Code or (ii) be reduced to the extent necessary to
avoid treatment as a parachute payment with the allocation of the reduction
among such payments and benefits and the period over which such payments and
benefits are to be provided to be determined by the officer and (B) that any
cash payment due an officer under an employment agreement shall be reduced by
the amount of any payments to be received by the officer for consulting
services provided to Sterling following the Effective Time.  

                              ARTICLE VI 
                         ADDITIONAL AGREEMENTS
                                    
   6.1  REGULATORY MATTERS.  

        (a)  Upon the execution and delivery of this Agreement, Sterling and
   Big Sky (as to information to be included therein pertaining to Big Sky)
   shall promptly cause to be prepared and filed with the SEC a registration
   statement of Sterling on Form S-4, including the Proxy Statement/Prospectus
   (the "Registration Statement") for the purpose of registering the Sterling
   Common Stock to be issued in the Merger and for soliciting the adoption and
   approval of this Agreement and the Merger by the stockholders of Big Sky.
   Sterling and Big Sky shall use their reasonable best efforts to have the
   Registration Statement declared effective by the SEC as soon as possible
   after the filing thereof.  The parties shall cooperate in responding to and
   considering any questions or comments from the SEC staff regarding the
   information contained in the Registration Statement.  If at any time after
   the Registration Statement is filed with the SEC, and prior to the Closing
   Date, any event relating to Big Sky is discovered by Big Sky which should
   be set forth in an amendment of, or a supplement to, the Registration
   Statement, including the Proxy Statement/Prospectus, Big Sky shall promptly
   inform Sterling, and shall furnish Sterling with all necessary information
   relating to such event, whereupon Sterling shall promptly cause an
   appropriate amendment to the Registration Statement to be filed with the
   SEC.  Upon the effectiveness of such amendment, each of Big Sky and
   Sterling (if prior to the meeting of the stockholders of Big Sky pursuant
   to Section 6.3 hereof) will take all necessary action as promptly as
   practicable to permit an appropriate amendment or supplement to be
   transmitted to its stockholders entitled to vote at such meeting.  Sterling
   shall also use reasonable efforts to obtain all necessary state securities
   law or "Blue Sky" permits and approvals required to carry out the
   transactions contemplated by this Agreement and the Institution Merger
   Agreement and Big Sky shall furnish all information concerning Big Sky and
   the holders of Big Sky Common Stock as may be reasonably requested in
   connection with any such action.  

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<PAGE>


<PAGE>
        (b)  The parties hereto shall cooperate with each other and use their
   best efforts to promptly prepare and file all necessary documentation, to
   effect all applications, notices, petitions and filings, and to obtain as
   promptly as practicable all permits, consents, approvals and authorizations
   of all third parties and Governmental Entities which are necessary or
   advisable to consummate the transactions contemplated by this Agreement
   (including without limitation the Merger and the Institution Merger).  Big
   Sky and Sterling shall have the right to review in advance, and to the
   extent practicable each will consult the other on, in each case subject to
   applicable Laws relating to the exchange of information, all the
   information relating to Big Sky or Sterling, as the case may be, which
   appears in any filing made with, or written materials submitted to, any
   third party or any Governmental Entity in connection with the transactions
   contemplated by this Agreement. In exercising the foregoing right, each of
   the parties hereto shall act reasonably and as promptly as practicable.
   The parties hereto agree that they will consult with each other with
   respect to the obtaining of all permits, consents, approvals and
   authorizations of all third parties and Governmental Entities necessary or
   advisable to consummate the transactions contemplated by this Agreement and
   each party will keep the other apprised of the status of matters relating
   to consummation of the transactions contemplated herein.

        (c)  Big Sky shall, upon request, furnish Sterling with all
   information concerning Big Sky and its directors, officers and stockholders
   and such other matters as may be reasonably necessary or advisable in
   connection with the Registration Statement or any other statement, filing,
   notice or application made by or on behalf of Sterling to any Governmental
   Entity in connection with the Merger or the other transactions contemplated
   by this Agreement.  

        (d)  Sterling and Big Sky shall promptly advise each other upon
   receiving any communication from any Governmental Entity whose consent or
   approval is required for consummation of the transactions contemplated by
   this Agreement which causes such party to believe that there is a
   reasonable likelihood that any Requisite Regulatory Approval (as defined in
   Section 7.1(c) hereof) will not be obtained or that the receipt of any such
   approval will be materially delayed.
  
   6.2  ACCESS TO INFORMATION.  

        (a)  Upon reasonable notice and subject to applicable Laws relating to
   the exchange of information, Big Sky shall accord to the officers,
   employees, accountants, counsel and other representatives of Sterling,
   access, during normal business hours during the period prior to the
   Effective Time, to all its and First Federal's properties, books,
   contracts, commitments and records and, during such period, Big Sky shall
   make available to Sterling (i) a copy of each report, schedule,
   registration statement and other document filed or received by it
   (including First Federal) during such period pursuant to the requirements
   of federal securities laws or federal or state banking laws and (ii) all
   other information concerning its (including First Federal) business,
   properties and personnel as 

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<PAGE>
   Sterling may reasonably request.  Sterling shall receive notice of all
   meetings of the Big Sky and First Federal's Board of Directors and any
   committees thereof, and of any management committees (in all cases, at
   least as timely as all Big Sky and First Federal, as the case may be,
   representatives to such meetings are required to be provided notice).
   Sterling will hold all such information in confidence to the extent
   required by, and in accordance with, the provisions of the confidentiality
   agreement which Sterling entered into with Big Sky dated February 2, 1998
   (the "Confidentiality Agreement").  

        (b)  Upon reasonable notice and subject to applicable Laws relating to
   the exchange of information, Sterling shall afford to the officers,
   employees, accountants, counsel and other representatives of Big Sky,
   access, during normal business hours during the period prior to the
   Effective Time, to such information regarding Sterling as shall be
   reasonably necessary for Big Sky to fulfill its obligations pursuant to
   this Agreement or which may be reasonably necessary for Big Sky to confirm
   that the representations and warranties of Sterling contained herein are
   true and correct and that the covenants of Sterling contained herein have
   been performed in all material respects.  Big Sky will hold all such
   information in confidence to the extent required by, and in accordance
   with, the provisions of the Confidentiality Agreement.  

        (c)  No investigation by either of the parties or their respective
   representatives shall affect the representations and warranties of the
   other set forth herein.  

        (d)  Big Sky shall provide Sterling with true, correct and complete
   copies of all financial and other information relating to the business or
   operations of Big Sky or First Federal that is provided to directors of Big
   Sky and First Federal in connection with meetings of their Boards of
   Directors or committees thereof.  

   6.3  STOCKHOLDER MEETINGS.  

   Big Sky shall take all steps necessary to duly call, give notice of,
convene and hold a meeting of its stockholders within 40 days after the
Registration Statement becomes effective for the purpose of voting upon the
approval of this Agreement and the Merger.  Management and the Board of
Directors of Big Sky shall recommend to Big Sky's stockholders approval of
this Agreement, including the Merger, and the transactions contemplated
hereby, together with any matters incident thereto; and in each case shall
oppose any third party proposal or other action that is inconsistent with this
Agreement or the consummation of the transactions contemplated hereby (subject
in each case to compliance in good faith with its fiduciary duties as advised
by counsel).  Big Sky and Sterling shall coordinate and cooperate with respect
to the foregoing matters.  

   6.4  LEGAL CONDITIONS TO MERGER.  

   Each of Sterling and Big Sky shall use their reasonable best efforts (a) to
take, or cause to be taken, all actions reasonably necessary, proper or
advisable to comply promptly with all legal

                                    36
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<PAGE>
requirements which may be imposed on such party with respect to the Merger
and, subject to the conditions set forth in Article VII hereof, to consummate
the transactions contemplated by this Agreement and (b) to obtain (and to
cooperate with the other party to obtain) any consent, authorization, order or
approval of, or any exemption by, any Governmental Entity and any other third
party which is required to be obtained by Big Sky or Sterling in connection
with the Merger and the other transactions contemplated by this Agreement.  

   6.5  STOCK EXCHANGE LISTING.  

   Sterling shall use its reasonable best efforts to cause the shares of
Sterling Common Stock to be issued in the Merger and pursuant to options
referred to herein to be approved for quotation on the Nasdaq Stock Market
National Market (or such other exchange on which the Sterling Common Stock has
become listed, or approved for listing) prior to or at the Effective Time.  

   6.6  EMPLOYEES.  

        (a)  To the extent permissible under the applicable provisions of the
   Code and ERISA, for purposes of crediting periods of service for
   eligibility to participate and vesting, but not for benefit accrual
   purposes, under employee pension benefit plans (within the meaning of ERISA
   Section 3(2)) maintained by Sterling or Sterling Savings Association, as
   applicable, individuals who are employees of Big Sky or First Federal at
   the Effective Time will be credited with periods of service with Big Sky or
   First Federal before the Effective Time (including service with any
   predecessor employer for which service credit was given under similar
   employee benefit plans of Big Sky or First Federal) as if such service had
   been with Sterling or Sterling Savings Association, as applicable.  Similar
   credit shall also be given by Sterling or Sterling Savings Association in
   calculating other retirement plan, vacation and similar benefits for such
   employees of Big Sky or First Federal after the Merger.  Sterling will or
   will cause Sterling Savings Association to (i) give credit to employees of
   Big Sky and First Federal, with respect to the satisfaction of the
   limitations as to pre-existing condition exclusions and waiting periods for
   participation and coverage which are applicable under the welfare benefit
   plans of Sterling or Sterling Savings Association, equal to the credit that
   any such employee had received as of the Effective Time towards the
   satisfaction of any such limitations and waiting periods under the
   comparable welfare benefit plans of Big Sky and First Federal and (ii)
   provide each employee of Big Sky and First Federal with credit for any
   co-payment and deductibles paid prior to the Effective Time in satisfying
   any deductible or out-of-pocket requirements. 

        (c)  Sterling will cause Sterling Savings Association to offer a
   position of at-will employment to each of First Federal's non-management
   branch office personnel in good standing as of the Effective Time.
   Sterling will use its reasonable best efforts in connection with reviewing
   applicants for employment positions to give Big Sky and First Federal
   employees who are not offered positions at the Effective Time the same
   consideration as is

                                    37
<PAGE>

<PAGE>
   afforded Sterling or Sterling Savings Association employees for such
   positions in accordance with existing formal or informal policies. 
 
   6.7  INDEMNIFICATION.  

        (a)  In the event of any threatened or actual claim, action, suit,
   proceeding or investigation, whether civil, criminal or administrative, in
   which any person who is now, or has been at any time prior to the date of
   this Agreement, or who becomes prior to the Effective Time, a director or
   officer or employee of Big Sky or First Federal (the "Indemnified Parties")
   is, or is threatened to be, made a party based in whole or in part on, or
   arising in whole or in part out of, or pertaining to (i) the fact that he
   is or was a director, officer or employee of Big Sky or First Federal or
   any of their respective predecessors or (ii) this Agreement or any of the
   transactions contemplated hereby, whether in any case asserted or arising
   before or after the Effective Time, the parties hereto agree to cooperate
   and use their best efforts to defend against and respond thereto.  It is
   understood and agreed that, after the Effective Time, Sterling shall
   indemnify and hold harmless, as and to the fullest extent permitted by
   applicable law, each such Indemnified Party against any losses, claims,
   damages, liabilities, costs, expenses (including reasonable attorney's fees
   and expenses in advance of the final disposition of any claim, suit,
   proceeding or investigation to each Indemnified Party to the fullest extent
   permitted by law upon receipt of any undertaking required by applicable
   law), judgments, fines and amounts paid in settlement in connection with
   any such threatened or actual claim, action, suit, proceeding or
   investigation, and in the event of any such threatened or actual claim,
   action, suit, proceeding or investigation (whether asserted or arising
   before or after the Effective Time), the Indemnified Parties may retain
   counsel reasonably satisfactory to Sterling; provided, however, that (1)
   Sterling shall have the right to assume the defense thereof and upon such
   assumption Sterling shall not be liable to any Indemnified.  Party for any
   legal expenses of other counsel or any other expenses subsequently incurred
   by any Indemnified Party in connection with the defense thereof, except
   that if Sterling elects not to assume such defense or counsel for the
   Indemnified Parties reasonably advises the Indemnified Parties that there
   are issues which raise conflicts of interest between Sterling and the
   Indemnified Parties, the Indemnified Parties may retain counsel reasonably
   satisfactory to Sterling, and Sterling shall pay the reasonable fees and
   expenses of such counsel for the Indemnified Parties, (2) Sterling shall be
   obligated pursuant to this paragraph to pay for only one firm of counsel
   for each Indemnified Party, and (3) Sterling shall not be liable for any
   settlement effected without its prior written consent (which consent shall
   not be unreasonably withheld or delayed).  Any Indemnified Party wishing to
   claim indemnification under this Section 6.7, upon learning of any such
   claim, action, suit, proceeding or investigation, shall notify Sterling
   thereof; provided, however, that the failure to so notify shall not affect
   the obligations of Sterling under this Section 6.7 except to the extent
   such failure to notify materially prejudices Sterling.  Sterling's
   obligations under this Section 6.7 continue in full force and effect for a
   period of six years from the Effective Time; provided, however, that all
   rights to 

                                    38
<PAGE>

<PAGE>
   indemnification in respect of any claim asserted or made within such period
   shall continue until the final disposition of such claim.  

        (b)  Sterling shall use commercially reasonable efforts to cause the
   persons serving as officers and directors of Big Sky immediately prior to
   the Effective Time to be covered by a directors' and officers' liability
   insurance policy ("Tail Insurance") of substantially the same coverage and
   amounts containing terms and conditions which are generally not less
   advantageous than Big Sky's current policy with respect to acts or
   omissions occurring prior to the Effective Time which were committed by
   such officers and directors in their capacity as such for a period not less
   than one year.  

        (c)  In the event Sterling or any of its successors or assigns (i)
   consolidates with or merges into any other person or entity and shall not
   be the continuing or surviving corporation or entity of such consolidation
   or merger, or (ii) transfers or conveys all or substantially all of its
   properties and assets to any person or entity, then, and in each such case,
   to the extent necessary, proper provision shall be made so that the
   successors and assigns of Sterling assume the obligations set forth in this
   section.  

        (d)  The provisions of this Section 6.7 are intended to be for the
   benefit of, and shall be enforceable by, each Indemnified Party and his or
   her heirs and representatives. 

   6.8  SUBSEQUENT INTERIM AND ANNUAL FINANCIAL STATEMENTS. 

   As soon as reasonably available, but in no event more than 45 days after
the end of each fiscal quarter (and 90 days in the case of the fourth fiscal
quarter), Sterling will deliver to Big Sky and Big Sky will deliver to
Sterling their respective Quarterly and Annual Reports, as filed with the SEC
under the Exchange Act.  Each party shall deliver to the other any Current
Reports on Form 8-K promptly after filing such reports with the SEC.  

   6.9  ADDITIONAL AGREEMENTS.  

   In case at any time after the Effective Time any further action is
necessary or desirable to carry out the purposes of this Agreement, or to vest
the Surviving Corporation or the Surviving Institution with full title to all
properties, assets, rights, approvals, immunities and franchises of any of the
parties to the Merger, or the constituent parties to the Institution Merger,
as the case may be, the proper officers and directors of each party to this
Agreement and Sterling's Subsidiaries and First Federal shall take all such
necessary action as may be reasonably requested by Sterling.  

   6.10 ADVICE OF CHANGES.  

   Sterling and Big Sky shall promptly advise the other party of any change or
event that, individually or in the aggregate, has had or would be reasonably
certain to have a material adverse effect on it or to cause or constitute a
material breach of any of its representations, warranties or

                                    39
<PAGE>


<PAGE>
covenants contained herein.  From time to time prior to the Effective Time,
each party will promptly supplement or amend its disclosure schedule delivered
in connection with the execution of this Agreement to reflect any matter
which, if existing, occurring or known at the date of this Agreement, would
have been required to be set forth or described in such disclosure schedule or
which is necessary to correct any information in such disclosure schedule
which has been rendered inaccurate thereby.  No supplement or amendment to
such disclosure schedule shall have any effect for the purpose of determining
satisfaction of the conditions set forth in Sections 7.2(a) or 7.3(a) hereof,
as the case may be, or the compliance by Big Sky or Sterling, as the case may
be, with the respective covenants set forth in Sections 5.1 and 5.2 hereof.  

   6.11 CURRENT INFORMATION.  

   During the period from the date of this Agreement to the Effective Time,
Big Sky will cause one or more of its designated representatives to confer on
a regular and frequent basis (not less than monthly) with representatives of
Sterling and to report the general status of the ongoing operations of Big
Sky.  Big Sky will promptly notify Sterling of any material change in the
normal course of business or in the operation of the properties of Big Sky and
of any governmental complaints, investigations or hearings (or communications
indicating that the same may be contemplated), or the institution or the
threat of litigation involving Big Sky, and will keep Sterling fully informed
of such events.  

   6.12 EXECUTION AND AUTHORIZATION OF INSTITUTION MERGER AGREEMENT.  

   Prior to the Effective Time, (a) Sterling and Big Sky shall each approve
the Institution Merger Agreement as the sole stockholder of Sterling Savings
Association and First Federal, respectively, and (b) First Federal shall
execute and deliver the Institution Merger Agreement.  

   6.13 CHANGE IN STRUCTURE.  

   Sterling may elect to modify the structure of the transactions contemplated
by this Agreement as noted herein so long as (i) there are no adverse tax 
consequences to the Big Sky stockholders as a result of such modification,
(ii) the consideration to be paid to the Big Sky stockholders under this
Agreement is not thereby changed or reduced in amount, and (iii) such
modification will not delay or jeopardize receipt of any required regulatory
approvals.  In the event that the structure of the Merger is modified pursuant
to this Section 6.13, the parties agree to modify this Agreement and the
various exhibits hereto to reflect such revised structure.  In such event,
Sterling shall prepare appropriate amendments to this Agreement and the
exhibits hereto for execution by the parties hereto.  Big Sky agrees to
cooperate fully with Sterling to effect such amendments.

                                    40
<PAGE>


<PAGE>
   6.14 TRANSACTION EXPENSES OF BIG SKY.  

   As promptly as practicable after the execution of this Agreement, Big Sky
will provide to Sterling an estimate of the expenses Big Sky expects to incur
in connection with the Merger, and shall keep Sterling reasonably informed of
material changes in such estimate.  

   6.15 AFFILIATE AGREEMENTS.  

        (a)  Not later than the 15th day prior to the mailing of the Proxy
   Statement/Prospectus, Big Sky shall deliver to Sterling a schedule of each
   person that, to the best of its knowledge, is or is reasonably likely to
   be, as of the date of the Big Sky stockholder meeting called pursuant to
   Section 6.3, deemed to be an "affiliate of it (each, an "Big Sky
   Affiliate") as that term is used in Rule 145 under the Securities Act or
   SEC Accounting Series Releases 130 and 135.  

       (b)  Big Sky shall use its reasonable best efforts to cause each person
   who may be deemed to be a Big Sky Affiliate to execute and deliver to
   Sterling on or before the date of mailing of the Proxy
   Statement/Prospectus, an agreement in the form attached hereto as Exhibit
   D.   

                              ARTICLE VII 
                          CONDITIONS PRECEDENT
                                    
   7.1  CONDITIONS TO EACH PARTY'S OBLIGATION TO EFFECT THE MERGER. 

   The respective obligation of each party to effect the Merger shall be
subject to the satisfaction at or prior to the Effective Time of the following
conditions: 

        (a)  STOCKHOLDER APPROVALS.  

             This Agreement and the Merger shall have been approved and
         adopted by the requisite vote of the Big Sky stockholders.

        (b)  STOCK EXCHANGE LISTING.  

             The shares of Sterling Common Stock which shall be issued in the
         Merger (including the Sterling Common Stock that may be issued upon
         exercise of the options referred to in Section 1.6 hereof) upon
         consummation of the Merger shall have been authorized for quotation
         on the Nasdaq Stock Market National Market (or such other exchange on
         which the Sterling Common Stock may become listed).

                                    41
<PAGE>


<PAGE>
        (c)  OTHER APPROVALS.  

             All regulatory approvals required to consummate the transactions
        contemplated hereby shall have been obtained and shall remain in full
        force and effect and all statutory waiting periods in respect thereof
        shall have expired (all such approvals and the expiration of all such
        waiting periods being referred to herein as the "Requisite Regulatory
        Approvals").

        (d)  REGISTRATION STATEMENT.  

             The Registration Statement shall have become effective under the
        Securities Act, and no stop order suspending the effectiveness of the
        Registration Statement shall have been issued and no proceedings for
        that purpose shall have been initiated or threatened by the SEC.

        (e)  NO INJUNCTIONS OR RESTRAINTS; ILLEGALITY.  

             No order, injunction or decree issued by any court or agency of
         competent jurisdiction or other legal restraint or prohibition (an
         "Injunction") preventing the consummation of the Merger or any of the
         other transactions contemplated by this Agreement or the Certificate
         of Merger shall be in effect.  No statute, rule, regulation, order,
         injunction or decree shall have been enacted, entered, promulgated or
         enforced by any Governmental Entity which prohibits, restricts or
         makes illegal consummation of the Merger.  No proceeding initiated by
         any Governmental Entity seeking an Injunction shall be pending.

        (f)  FEDERAL TAX OPINION.  

             Sterling shall have received an opinion from Witherspoon, Kelley,
        Davenport & Toole, P.S. to Sterling, and Big Sky shall have received
        an opinion from Breyer & Aguggia, counsel to Big Sky, in form and
        substance reasonably satisfactory to Sterling and Big Sky,
        respectively, dated the date of the Effective Time, in each case,
        substantially to the effect that on the basis of facts,
        representations, and assumptions set forth in such opinion which are
        consistent with the state of facts existing at the Effective Time, the
        Merger will be treated for federal income tax purposes as a
        reorganization within the meaning of Section 368(a) of the Code and
        each of Sterling and Big Sky will be a party to the reorganization
        with the meaning of Section 368(b) of the Code and that, accordingly,
        for federal income tax purposes, (i) no gain or loss will be
        recognized by Sterling or Big Sky as a result of the Merger, (ii) no
        gain or loss will be recognized by the stockholders of Big Sky who
        exchange all of their Big Sky Common Stock solely for Sterling Common
        Stock pursuant to the Merger (except with respect to cash received in
        lieu of a fractional

                                    42
<PAGE>


<PAGE>
        share interest in Sterling Common Stock), and (iii) the aggregate tax
        basis of the Sterling Common Stock received by stockholders who
        exchange all of their Big Sky Common Stock solely for Sterling Common
        Stock pursuant to the Merger will be the same as the aggregate tax
        basis of the Big Sky Common Stock surrendered in exchange therefor
        (reduced by any amount allocable to a fractional share interest for
        which cash is received).  In rendering such opinion, such counsel
        shall require and, to the extent such counsel deems necessary or
        appropriate, may rely upon representations and covenants,
        including those contained in certificates of officers of Big Sky,
        Sterling, their respective affiliates and others.

   7.2  CONDITIONS TO OBLIGATIONS OF STERLING.  

   The obligation of Sterling to effect the Merger is also subject to the
satisfaction or waiver by Sterling at or prior to the Effective Time of the
following conditions: 

        (a)  REPRESENTATIONS AND WARRANTIES.  

             The representations and warranties of Big Sky set forth in this
        Agreement shall be true and correct as of the date of this Agreement
        and (except to the extent such representations and warranties speak as
        of an earlier date) as of the Closing Date as though made on and as of
        the Closing Date; provided, however, that for purposes of this
        paragraph, such representations and warranties shall be deemed to be
        true and correct, unless the failure or failures of such
        representations and warranties to be so true and correct, individually
        or in the aggregate, would have a material adverse effect on Big Sky.
        Sterling shall have received a certificate signed on behalf of Big Sky
        by each of the President and Chief Executive Officer and the Chief
        Financial Officer of Big Sky to the foregoing effect.  

        (b)  PERFORMANCE OF COVENANTS AND AGREEMENTS OF BIG SKY 

             Big Sky shall have performed in all material respects all
        covenants and agreements required to be performed by it under this
        Agreement at or prior to the Closing Date.  Sterling shall have
        received a certificate signed on behalf of Big Sky by each of the
        President and Chief Executive Officer and the Chief Financial Officer
        of Big Sky to such effect.
  

        (c)  POOLING OF INTERESTS.  

             Sterling shall have received as of the Effective Time, written
        opinions of Coopers & Lybrand LLP and Deloitte and Touche LLP to the
        effect that the Merger may be accounted for as a pooling-of-interests.


                                    43
<PAGE>


<PAGE>
        (d)  STOCKHOLDERS AGREEMENT

             On or before April 30, 1998, the agreement in the form which is
        attached hereto as Exhibit E (the "Stockholders Agreement") shall
        have been entered into by all of the stockholders whose names appear
        on the Stockholders Agreement and a minimum of 68,000 shares of Big
        Sky Common Stock shall therefore have become subject to the terms and
        provisions of the Stockholders Agreement.

   7.3  CONDITIONS TO OBLIGATIONS OF BIG SKY.  

   The obligation of Big Sky to effect the Merger is also subject to the
satisfaction or waiver by Big Sky at or prior to the Effective Time of the
following conditions: 

        (a)  REPRESENTATIONS AND WARRANTIES.  

             The representations and warranties of Sterling set forth in this
        Agreement shall be true and correct as of the date of this Agreement
        and (except to the extent such representations and warranties speak as
        of an earlier date) as of the Closing Date as though made on and as of
        the Closing Date; provided, however, that for purposes of this
        paragraph, such representations and warranties shall be deemed to be
        true and correct, unless the failure or failures of such
        representations and warranties to be so true and correct, individually
        or in the aggregate, would have a material adverse effect on Sterling.
        Big Sky shall have received a certificate signed on behalf of Sterling
        by each of the President and Chief Executive Officer and the Chief
        Financial Officer of Sterling to the foregoing effect.
 
        (b)  PERFORMANCE OF COVENANTS AND AGREEMENTS OF 
             STERLING.

             Sterling shall have performed in all material respects all
        covenants and agreements required to be performed by it under this
        Agreement at or prior to the Closing Date.  Big Sky shall have
        received a certificate signed on behalf of Sterling by each of the
        President and Chief Operating Officer and the Chief Financial Officer
        of Sterling to such effect.  


                             ARTICLE VIII 
                       TERMINATION AND AMENDMENT
                                    
   8.1  TERMINATION.  

   This Agreement may be terminated at any time prior to the Effective Time,
whether before or after approval of this Agreement by the stockholders of Big
Sky: 

                                    44
<PAGE>


<PAGE>
             (a)  by mutual consent of Sterling and Big Sky in a written
        instrument, if the Board of Directors of each so determines by a vote
        of a majority of the members of its entire Board; 

             (b)  by either Sterling or Big Sky upon written notice to the
        other party 15 days after the date on which any request or application
        for a Requisite Regulatory Approval shall have been denied or
        withdrawn at the request or recommendation of the Governmental Entity
        which must grant such Requisite Regulatory Approval, unless within the
        15-day period following such denial or withdrawal the parties agree to
        file, and have filed with the applicable Governmental Entity, a
        petition for rehearing or an amended application, provided, however,
        that no party shall have the right to terminate this Agreement, if
        such denial or request or recommendation for withdrawal shall be due
        to the failure of the party seeking to terminate this Agreement to
        perform or observe the covenants and agreements of such party set
        forth herein; 

             (c)  by either Sterling or Big Sky if the Merger shall not have
        been consummated on or before December 31, 1998, unless the failure of
        the Closing to occur by such date shall be due to the failure of the
        party seeking to terminate this Agreement to perform or observe the
        covenants and agreements of such party set forth herein; 

             (d)  by either Sterling or Big Sky (provided that Big Sky is not
        in breach of its obligations under Section 6.3 hereof) if the approval
        of the stockholders of Big Sky required for the consummation of the
        Merger as contemplated by this Agreement shall not have been obtained
        by reason of the failure to obtain the required vote at the duly held
        meeting of stockholders or at any adjournment or postponement thereof;

             (e)  by either Sterling or Big Sky (provided that the terminating
        party is not then in breach of any representation, warranty, covenant
        or other agreement contained herein that, individually or in the
        aggregate, would give the other party the right to terminate this
        Agreement) if there shall have been a breach of any of the
        representations or warranties set forth in this Agreement on the part
        of the other party, if such breach, individually or in the aggregate,
        has had or would be reasonably certain to have a material adverse
        effect on the breaching party and such breach shall not have been
        cured within 15 days following receipt by the breaching party of
        written notice of such breach from the other party hereto or such
        breach, by its nature, cannot be cured prior to the Closing;

             (f)  by either Sterling or Big Sky (provided that the terminating
        party is not then in breach of any representation, warranty, covenant
        or other agreement contained herein that, individually or in the
        aggregate, would give the other party the right to terminate this
        Agreement) if there shall have been a material breach of any of the
        covenants or agreements set forth in this Agreement on the part of the
        other party and such breach shall not have been cured within 15 days
        following receipt by the breaching party of written notice of such

                                    45
<PAGE>

<PAGE>
        breach from the other party hereto or such breach, by its nature,
        cannot be cured prior to the Closing; and

             (g)  by either Sterling or  Big Sky, if the Board of Directors of
        the other party shall have withdrawn, modified or changed in a manner
        adverse to the terminating party its approval or recommendation of
        this Agreement and the transactions contemplated thereby.

        8.2  EFFECT OF TERMINATION.  

             (a)  In the event of termination of this Agreement by either
        Sterling or Big Sky as provided in Section 8.1 hereof, this Agreement
        shall forthwith become void and have no effect except (i) the last
        sentences of Sections 6.2(a) and 6.2(b) and Sections 8.2, 9.2 and 9.3
        hereof shall survive any termination of this Agreement, and (ii)
        notwithstanding anything to the contrary contained in this Agreement,
        no party shall be relieved or released from any liabilities or damages
        arising out of its willful or intentional breach of any provision of
        this Agreement.  

             (b)  If Sterling has terminated this Agreement pursuant to
        Sections 8.1(d), 8.1(e), 8.1(f) or 8.1(g) hereof, Big Sky shall pay
        to Sterling a fee (the "Big Sky Termination Fee") of $500,000.  The
        Big Sky Termination Fee shall be payable by Big Sky to Sterling within
        two business days following written notice of a demand therefore and
        shall be made by wire transfer of immediately available funds to an
        account designated by Sterling in the said notice.

             (c)  If Big Sky has terminated this Agreement pursuant to
        Sections 8.1(e), 8.1(f) or 8.1(g) hereof, or if Sterling has
        terminated this Agreement because (i) the opinion of Coopers & Lybrand
        LLP referred to in Section 7.2(c) hereof has not been provided and
        (ii) the opinion has not been provided because of a condition relating
        to, or action taken by, Sterling, Sterling shall pay to Big Sky a fee
        (the "Sterling Termination Fee") of $300,000.  The Sterling
        Termination Fee shall be payable by Sterling to Big Sky within two
        business days following written notice of a demand therefor and shall
        be made by wire transfer of immediately available funds to an account
        designated by Big Sky in the said notice. 

             (d)  Sterling and Big Sky agree that the agreements contained in
        this Section 8.2  are intended to increase the likelihood that the
        transactions contemplated by this Agreement will occur in accordance
        herewith, are an integral part of the transactions contemplated by
        this Agreement and that without such agreements they would not have
        entered into this Agreement.  If either party fails to pay the amounts
        due under paragraphs (b) or (c) of this Section 8.2 within the time
        periods specified therein, such party shall pay the costs and expenses
        (including legal fees and expenses) incurred by the other party in
        connection with any action, including the filing of any lawsuit, taken
        to collect payment of such amounts, together with interest on the
        amount of such amounts at the publicly announced prime rate of Bank of
        America from the date such amounts were required to be paid.


                                    46
<PAGE>


<PAGE>
   8.3  AMENDMENT.  

   Subject to compliance with applicable law, this Agreement may be amended by
the parties hereto, by action taken or authorized by their respective Boards
of Directors, at any time before or after approval of the matters presented in
connection with the Merger by the stockholders of Big Sky; provided, however,
that after any approval of the transactions contemplated by this Agreement by
Big Sky's stockholders, there may not be, without further approval of such
stockholders, any amendment of this Agreement which reduces the amount or
changes the form of the consideration to be delivered to Big Sky stockholders
hereunder other than as contemplated by this Agreement.  This Agreement may
not be amended except by an instrument in writing signed on behalf of each of
the parties hereto.  

   8.4  EXTENSION; WAIVER.  

   At any time prior to the Effective Time, the parties hereto, by action
taken or authorized by their respective Boards of Directors, may, to the
extent legally allowed, (a) extend the time for the performance of any of the
obligations or other acts of the other parties hereto, (b) waive any
inaccuracies in the representations and warranties contained herein or in any
document delivered pursuant hereto, and (c) waive compliance with any of the
agreements or conditions contained herein.  Any agreement on the part of a
party hereto to any such extension or waiver shall be valid only if set forth
in a written instrument signed on behalf of such party, but such extension or
waiver or failure to insist on strict compliance with an obligation, covenant,
agreement or condition shall not operate as a waiver of, or estoppel with
respect to, any subsequent or other failure.  

                              ARTICLE IX 
                           GENERAL PROVISIONS
                                    
   9.1  CLOSING.  

   Subject to the terms and conditions of this Agreement, the closing of the
Merger (the "Closing") will take place at 10:00 a.m.  at the offices of
Witherspoon, Kelley, Davenport & Toole, P.S. on September 30, 1998 or such
other date, place and time as the parties may agree (the "Closing Date").
   
   9.2  NONSURVIVAL OF REPRESENTATIONS, WARRANTIES AND
        AGREEMENTS.

    None of the representations, warranties, covenants and agreements in this
Agreement or in any instrument delivered pursuant to this Agreement shall
survive the Effective Time, except for those covenants and agreements
contained herein or therein which by their terms apply in whole or in part
after the Effective Time.


                                    47
<PAGE>

<PAGE>
   9.3  EXPENSES.  

        (a)  All costs and expenses incurred in connection with this Agreement
   and the transactions contemplated hereby shall be paid by the party
   incurring such expense.   

        (b)  Any payment required by this Section 9.3 shall be payable by Big
   Sky to Sterling within two business days following written notice of a
   demand therefore.  Any such payment shall be made by wire transfer of
   immediately available funds to an account designated by Sterling in the
   said notice.  If Big Sky fails to pay Sterling the amounts due under this
   Section 9.3 within the time periods specified herein, Big sky shall pay the
   costs and expenses (including legal fees and expenses) incurred by Sterling
   in connection with any action, including the filing of any lawsuit, taken
   to collect payment of such amounts, together with interest on the amount of
   any such unpaid amounts at the publicly announced prime rate of the Bank of
   America from the date such amounts were required to be paid.

   9.4  NOTICES.  

   All notices and other communications hereunder shall be in writing and
shall be deemed given if delivered personally, mailed by registered or
certified mail (return receipt requested) or delivered by an express courier
(with confirmation) to the parties at the following addresses (or at such
other address for a party as shall be specified by like notice): 

        (a)  if to Sterling, to: 
             Sterling Financial Corporation 
             111 North Wall Street
             Spokane, Washington 99201
             Attn.: Daniel G. Byrne 
             Senior Vice President-Finance
             
        WITH A COPY TO: 
             Witherspoon, Kelley, Davenport & Toole, P.S.
             422 West Riverside Avenue, Suite 1100
             Spokane, Washington  99201
             Attn.:  Donald J. Lukes, Esq.



                                    48
<PAGE>


<PAGE>
   and 

        (b)  if to Big Sky, to: 
             Big Sky Bancorp, Inc.  
             711 South First 
             Hamilton, Montana  59840
             Attn.: Michael E. McKee
             President and Chief
             Executive Officer 

        WITH A COPY TO: 
             
             Breyer & Aguggia
             Suite 470 East
             1300 I Street, N.W.
             Washington, D.C.  20005
             Attn: Paul M. Aguggia, Esq.

   9.5  INTERPRETATION.  

   When a reference is made in this Agreement to Sections, Exhibits or
Schedules, such reference shall be to a Section of or an Exhibit or Schedule
to this Agreement unless otherwise indicated.  The table of contents and
headings contained in this Agreement are for reference purposes only and shall
not affect in any way the meaning or interpretation of this Agreement. 
Whenever the words "include", "includes" or "including" are used in this
Agreement, they shall be deemed to be followed by the words "without
limitation".  No provision of this Agreement shall be construed to require
Sterling, Big Sky or any of their respective Subsidiaries or affiliates to
take any action that would violate any applicable law, rule or regulation.  

   9.6  COUNTERPARTS.       

   This Agreement may be executed in counterparts, all of which shall be
considered one and the same agreement and shall become effective when
counterparts have been signed by each of the parties and delivered to the
other parties, it being understood that all parties need not sign the same
counterpart.

                                    49
<PAGE>


<PAGE>
   9.7  ENTIRE AGREEMENT.  

   This Agreement (including the disclosure schedules, documents and the
instruments referred to herein) constitutes the entire agreement and
supersedes all prior agreements and understandings, both written and oral,
among the parties with respect to the subject matter hereof, other than the
Confidentiality Agreement, the Institution Merger Agreement and the
Certificate of Merger.

   9.8  GOVERNING LAW.  

   This Agreement shall be governed and construed in accordance with the laws
of the State of Washington, without regard to any applicable conflicts of law
rules.  

   9.9  ENFORCEMENT OF AGREEMENT.  

   The parties hereto agree that irreparable damage would occur in the event
that the provisions of this Agreement were not performed in accordance with
its specific terms or were otherwise breached.  It is accordingly agreed that
the parties shall be entitled to an injunction or injunctions to prevent
breaches of this Agreement and to enforce specifically the terms and
provisions thereof in any court of the United States or any state having
jurisdiction, this being in addition to any other remedy to which they are
entitled at law or in equity.
   
   9.10 SEVERABILITY.  

   Any term or provision of this Agreement which is invalid or unenforceable
in any jurisdiction shall, as to that jurisdiction, be ineffective to the
extent of such invalidity or unenforceability without rendering invalid or
unenforceable the remaining terms and provisions of this Agreement or
affecting the validity or enforceability of any of the terms or provisions of
this Agreement in any other jurisdiction.  If any provision of this Agreement
is so broad as to be unenforceable, the provision shall be interpreted to be
only so broad as is enforceable.  

   9.11 PUBLICITY.  

   Except as otherwise required by law or the rules of the Nasdaq Stock Market
National Market (or such other exchange on which the Sterling Common Stock may
become listed), so long as this Agreement is in effect, neither Sterling nor
Big Sky shall, or shall permit any of Sterling's Subsidiaries or First Federal
to, issue or cause the publication of any press release or other public
announcement with respect to, or otherwise make any public statement
concerning, the transactions contemplated by this Agreement or the Institution
Merger Agreement without the consent of the other party, which consent shall
not be unreasonably withheld.

                                    50
<PAGE>


<PAGE>
   9.12  ASSIGNMENT; LIMITATION OF BENEFITS.  

   Neither this Agreement nor any of the rights, interests or obligations
hereunder shall be assigned by any of the parties hereto (whether by operation
of law or otherwise) without the prior written consent of the other parties. 
Subject to the preceding sentence, this Agreement will be binding upon, inure
to the benefit of and be enforceable by the parties and their respective
successors and assigns.  Except as otherwise specifically provided in Section
6.7 hereof, this Agreement (including the documents and instruments referred
to herein) is not intended to confer upon any person other than the parties
hereto any rights or remedies hereunder, and the covenants, undertakings and
agreements set out herein shall be solely for the benefit of, and shall be
enforceable only by, the parties hereto and their permitted assigns.  

   IN WITNESS WHEREOF, Sterling and Big Sky have caused this Agreement to be
executed and delivered by their respective officers thereunto duly authorized
as of the date first above written.
  
                                 STERLING FINANCIAL CORPORATION



                                 By /s/ Harold B. Gilkey
                                    -------------------------------------  
                                    HAROLD B. GILKEY
                                    Chairman and Chief Executive Officer



                                 BIG SKY BANCORP, INC.

   
                                 By /s/ Michael E. McKee
                                    --------------------------------------
                                    MICHAEL E. McKEE
                                    President and Chief Executive Officer


                                    51
<PAGE>



<PAGE>
                                                               Exhibit 99




For release April 23, 1998--2:00 p.m. (PST)   Contact:  Heidi B. Stanley, EVP
                                                        (509) 358-6160

                 Sterling Financial Corporation to Acquire
                 -----------------------------------------                     
             
                           Big Sky Bancorp, Inc.
                           ---------------------

Spokane, Washington - April 23, 1998 - Sterling Financial Corporation
- ------------------------------------  (NASDAQ:STSA) today announced the
signing of a definitive agreement to acquire Big Sky Bancorp, Inc., and its
subsidiary, First Federal Savings and Loan Association of Montana.  Under the
terms of the agreement, Sterling will issue, subject to exercise of Big Sky
options, up to 497,545 shares of common stock in exchange for all of the
issued and outstanding Big Sky stock.  The merger will be structured as a
tax-free reorganization and accounted for as a pooling of interests.

First Federal conducts operations from two offices in the city of Missoula,
Montana, the largest city in western Montana, and from its headquarters in
Hamilton, Montana.  At December 31, 1997, First Federal had approximately
$62.8 million in total assets with deposits of nearly $47.8 million.
 
Sterling's Chairman and CEO, Harold B. Gilkey, has very strong ties to
Montana.  He was born and raised in Livingston, Montana; attended the
University of Montana in Missoula; and is the immediate past chairman of
the University of Montana Foundation.  He said, "First Federal is a
well-established and respected institution.  I believe Sterling can continue
their rich legacy of customer service and community support.

"This merger fits well within our broad strategy of being a leading community
bank in the Northwest.  First Federal is positioned in the highest growth area
of Montana, which we currently serve through our residential lending
subsidiary Action Mortgage Co. and our commercial banking subsidiary
INTERVEST-Mortgage Investment Co," Gilkey stated.

                                   -more-


<PAGE>


<PAGE>
Sterling Financial Corporation
Page 2
April 23, 1998


Michael E. McKee, President and CEO of Big Sky and First Federal, said, "As
management and the Board of First Federal looked forward, considering the size
of our company, we recognized that we had limited resources with which to
better serve our customers as well as expand within our markets.  This merger
presents an opportunity to increase market share, particularly with the
addition of Sterling's array of financial products and services, including
small business services."

Mr. McKee, a long-time acquaintance of Mr. Gilkey, added, "Sterling's
community banking expertise and the "Hometown Helpful" manner in which they do
business is very complementary to the manner in which First Federal operates."

The agreement, which was unanimously approved by both Boards of Directors,
will merge Big Sky Bancorp, Inc., into Sterling Financial Corp. and First
Federal Savings and Loan Association into Sterling Savings.  The agreement
provides for each shareholder of Big Sky to receive 1.384 Sterling Common
Shares for each of his or her Big Sky Common Shares held, and cash in lieu of
the issuance of fractional shares.

To illustrate the value of this transaction at a given point in time, using
Sterling's closing stock price on Wednesday, April 22, of $25.625 per share,
the transaction would have a value of $35.46 per share to Big Sky
shareholders, and an approximate transaction value of $12.7 million.  This
purchase price is approximately 1.61 times Big Sky's book value.  Further, as
part of the agreement, Big Sky has agreed to pay a $500,000 cash break-up fee
to Sterling if the agreement is terminated under certain circumstances.

"We anticipate that the merger will have a neutral impact on earnings this
year and a marginally accretive impact during 1999," Gilkey stated.  All First
Federal employees will be offered positions with Sterling; and Sterling's
regional structure will likely be revised to take into account the Montana
branches.

                                  -more-

<PAGE>


<PAGE>
Sterling Financial Corporation
Page 3
April 23, 1998


The merger is subject to certain conditions, including receipt of regulatory
approval and Big Sky shareholder approval.  Pending these approvals, Sterling
anticipates that the transaction will be completed in mid fall.


Sterling Financial Corporation of Spokane, Washington, is a savings and loan
holding company which owns Sterling Savings Association.  Sterling Savings
Association is a Washington State-chartered, federally insured stock savings
association which opened in April 1983.  Sterling Savings Association, based
in Spokane, Washington, has branches throughout  Washington State and in the
Portland, Oregon, area.  Through Sterling's wholly owned subsidiaries Action
Mortgage Company and INTERVEST Mortgage Investment Company, it operates loan
production offices in Washington, Oregon, and Idaho.  Sterling's subsidiary
Harbor Financial Services provides non-bank investments, including mutual
funds, variable annuities, and tax-deferred annuities through regional
representatives throughout Sterling Savings' branch network.

                                 -30-

<PAGE>




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