SIERRAWEST BANCORP
8-K, 1997-01-31
STATE COMMERCIAL BANKS
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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: January 24, 1997




                               SIERRAWEST BANCORP
               (Exact Name of Registrant as Specified in its Charter)




                                   California
                            (State of Incorporation)

                                File No. 0-15450
                              (Commission File No.)
                                   68-0091859
                                  (IRS Employer
                               Identification No.)



        10181 Truckee-Tahoe Airport Road, Truckee, CA 96160-9010
                (Address of Principal Executive Offices)

            Registrant's Telephone Number: (916) 582-3000


                                     
<PAGE>

Item 5.           Other Events

On January 24, 1997,  SierraWest  Bancorp issued a press release announcing that
it has signed a definitive agreement to acquire Sacramento-based Mercantile Bank
("Mercantile").  Mercantile,  which  currently  has total assets of $45 million,
will be merged into SierraWest  Bancorp's  wholly-owned  subsidiary,  SierraWest
Bank. The acquisition,  which is scheduled to close in June, 1997, is subject to
the approval of Mercantile's shareholders and federal and state regulators.



                                     

<PAGE>



Item 7.           Financial Statements and Exhibits

(c)      Exhibits

         2.       Plan of Acquisition and Merger by and between SierraWest
                  Bancorp, SierraWest Bank and Mercantile Bank.

         99.      Press release dated January 24, 1997.



                                     

<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.



                                                  SierraWest Bancorp
                                                  (Registrant)



Dated: January 31, 1997                            By:/s/ David C. Broadley
Truckee, California                                David C. Broadley
                                                   EVP/Chief Financial Officer



                                     
<PAGE>




                                   EXHIBIT 2



                         PLAN OF ACQUISITION AND MERGER

                                 BY AND BETWEEN

                               SIERRAWEST BANCORP

                                 SIERRAWEST BANK

                                       AND

                                 MERCANTILE BANK







                                     
<PAGE>



                                TABLE OF CONTENTS

                                                                           page

Section 1. THE MERGER. .. . . . . . . . . . . . . . . . . . . . . . . . . . . 1

       1.1 Effective Date. . .  . . . . . . . . . . . . . . . . . . . . . . . 1
       1.2 Effect of  the Merger.. . . .  . . . . . . . . . . . . . . . . . . 1

Section 2. CONVERSION AND CANCELLATION OF SHARES. . . . .... .  . . . . . . . 2

       2.1Exchange Amount; Conversion of Shares of Mercantile Common Stock. . 2
       2.2Cash/Stock Election. . . . . . . . . . . . .. . . . . . . . . . . . 4
       2.3Fractional Share. . . . . . . . . . . . . .  . . . . . . . . . .. . 5
       2.4Surrender of Mercantile Shares. . . . . . .  . . . . . . . . . .. . 5
       2.5No Further Transfers of Mercantile Shares. .. . . . . . . . . .  . .6
       2.6Adjustments. . . . . . . . . . .  . . . . . . . . . . . . . . . . . 6
       2.7Personnel Matters. . . . . . . .  . . . . . . . . . . . . . . .  . .6

Section 3.COVENANTS OF THE PARTIES. . . . . . . . . . . . . . . . . . . .  . .7

       3.1Mutual Covenants. . . . . . . . .. . . . . . . . . . . . . . . . . .7
         (a)Government Approvals. . . . . . .  . . . . . . . . . . . . . .. . 7
         (b)Notification of Breach of Representations, Warranties and
            Covenants . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
         (c)Financial Statements. . . . . . . . . . . . . . . . . . . . .  .  8
         (d)Press Releases . . . . . . . . . . . . . . . . . . . . . . . . .  8
         (e)Access to Properties, Books and Records; Confidentiality. . . ..  9
         (f)Additional Agreements. . . . . . . . . . . . . . . . . . . . .  . 9
         (g)Advice of Changes. . . . . . . . . . . . . . . . . . . . . . . . 10
         (h)Legal Conditions to Merger. . . . . . . . . . . . . . . .  . . . 10

       3.2Covenants of Mercantile. . . . . . . . . . . . . . . . . . .. . . .10
         (a)Approval by Shareholders. . . . . . . . . . . . . . . . .  . . . 10
         (b)Compensation. . . . . . . . . . . . . . . . . . . . . . . . . . .10
         (c)Conduct of Business in the Ordinary Course. . . . . . . . . . . .11
         (d)No Merger or Solicitation. . . . . . . . . . . . . . . . .. . . .13
         (e)Changes in Capital Stock; Dividends. . . . . . . . . . . .. . . .14
         (f)Employee Welfare Benefit Plans. . . . . . . . . . . . . . . . . .14
         (g)Shareholder Lists and Other Information. . . . . . . . . . . . . 14
         (h)Capital Commitments and Expenditures. . . . . . . . . . . . . . .14


<PAGE>



                                TABLE OF CONTENTS
                                   (continued)
         (i)Asset Review. . . . . . . . . . . . . . . . . . . . . . . .. . . 14

       3.3Covenants of Sierra. . .. . . . . . . . . . . . . . . . . . . . .. 15
         (a)Conduct of Business in the Ordinary Course. . . . . . . . . . . .15
         (b)  Dividends. . . . . . . . . . . . . . . . . . . . . . . .  . . .16
         (c)Indemnification; Insurance . . . . . . . . . . . . . . . . . . . 16

Section 4.REPRESENTATIONS AND WARRANTIES OF MERCANTILE. . . . . . .. . . . . 18

       4.1Corporate Status and Power to Enter Into Agreements. . . . . . . . 18
       4.2Articles, Bylaws, Books and Records. . . . . . . . . . . .  . . . .18
       4.3Compliance With Laws, Regulations and Decrees. . . . . . . . . . . 18
       4.4Capitalization. . . . . . . . . . . . . . . . . . . . . . . .. . . 19
       4.5Equity Interest in Any Entity. . . . . . . . . . . . . . . . . . . 19
       4.6Financial Statements, Regulatory Reports. . . . . . . . . . .. . . 19
       4.7Tax Returns. . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
       4.8Material Adverse Change. . . . . . . . . . . . . . . . . . .  . .  20
       4.9No Undisclosed Liabilities.. . . . . . . . . . . . . . . . . . . . 21
       4.10Properties and Leases. . . . . . . . . . . . . . . . . . . .. . . 21
       4.11Material Contracts. . . . . . . . . . . . . . . . . . . . . . . . 22
       4.12Loans. . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 22
       4.13Restrictions on Investments. . . . . . . . . . . . . . . . .. . . 22
       4.14Employment Contracts and Benefits. . . . . . . . . . . . . .. . . 23
       4.15Collective Bargaining and Employment Agreements. . . . . . .. . . 23
       4.16Compensation of Officers and Employees. . . . . . . . . . . . . . 23
       4.17Legal Actions and Proceedings. . . . . . . . . . . . . . . . . .  24
       4.18Execution and Delivery of the Agreement. . . . . . . . . . .. . . 24
       4.19Retention of Broker or Consultant. . . . . . . . . . . . . . . . .25
       4.20Insurance. . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
       4.21Loan Loss Reserves. . . . . . . . . . . . . . . . . . . . .  . . .25
       4.22Transactions With Affiliates. . . . . . . . . . . . . . . . . . . 25
       4.23Information in Sierra Registration Statement.. . . . . . . . . .  25
       4.24Accuracy of Representations and Warranties. . . . . . . . . . . . 26

Section 5.REPRESENTATIONS AND WARRANTIES OF SIERRA. . . . . . . . . . . . . .26
<PAGE>

                                TABLE OF CONTENTS
                                   (continued)

       5.1Corporate Status and Power to Enter Into Agreements. . . . . .  . .26
       5.2Articles, Bylaws, Books and Records. . . . . . . . . . . . . . . . 26
       5.3Compliance With Laws, Regulations and Decrees. . . . . . . . .  .  26
       5.4Capitalization. . . . . . . . . . . . . . . . . . . . . . . . . . .27
       5.55Financial Statements, Regulatory Reports. . . . . . . . . . . . . 27
       5.6Tax Returns. . . . . . . . . . . . . . . . . . . . . . . . . .  .  28
       5.7Material Adverse Change. . . . . . . . . . . . . . . . . . . . . . 28
       5.8Legal Actions and Proceedings. . . . . . . . . . . . . . . . . . . 28
       5.9Execution and Delivery of the Agreement. . . . . . . . . . . .  . .29
       5.10No Undisclosed Liabilities. . . . . . . . . . . . . . . . . . . . 29
       5.11No Material Environmental Liabilities. . . . . . . . . . . .  . . 29
       5.12No Material Liabilities Under ERISA. . . . . . . . . . . . . . . .30
       5.13Retention of Broker or Consultant. . . . . . . . . . . . . .  . . 30
       5.14Loan Loss Reserves. . . . . . . . . . . . . . . . . . . . . . . . 30
       5.15Information in Sierra Registration Statement. . . . . . . .   . . 30
       5.16Accuracy of Representations and Warranties. . . . . . . . . . . . 30
    
Section 6. SECURITIES ACT OF 1933; SECURITIES EXCHANGE ACT OF 1934. . . . . .31

       6.1Preparation and Filing of Registration Statement. . . . . .. . . . 31
       6.2Effectiveness of Registration Statement and Listing of Shares. . . 31
       6.3Sales and Resales of Common Stock. . . . . . . . . . . . . . . . . 31
       6.4 Rule 145 and Related Matters. . . . . . . . . . . . . . . . . . . 31

Section 7.CONDITIONS TO THE OBLIGATIONS OF SIERRA. . . . . . . . . . . . . . 32

       7.1Representations and Warranties. . . . . . . . . . . . . . . . . . .32
       7.2Compliance and Performance Under Agreement. . . . . . . . . . . . .32
       7.3Material Adverse Change. . . . . . . . . . . . . . . . . . . . . . 32
       7.4Approval of Agreement. . . . . . . . . . . . . . . . . . . . . . . 32
       7.5Officer's Certificate. . . . . . . . . . . . . . . . . . . . . . . 32
       7.6Opinion of Counsel. . . . . . . . . . . . . . . . . . . . . . .. . 32
       7.7Absence of Legal Impediment. . . . . . . . . . . . . . . . . .  . .32
       7.8Effectiveness of Registration Statement. . . . . . . . . . . . . . 33
       7.9Government Approvals. . . . . . . . . . . . . . . . . . . . . . .  33


<PAGE>



                                TABLE OF CONTENTS
                                   (continued)

       7.10Tax Opinion. . . . . . . .  . . . . . . . . . . . . . . . . . . . 33
       7.11Unaudited Financials. . . . . . . . . . . . . . . . . . . .. . . .34
       7.12Rule 145 Undertaking. . . . . . . . . . . . . . . . . . . . . . . 34
       7.13Closing Documents. . . . .  . . . . . . . . . . . . . . . .. . . .34
       7.14Consents. . . . . . . . . .. . . . . . . . . . . . . . . . . . . .34
       7.15Shareholder Agreements. . . . . . . . . . . . . . . . . . .. . . .34
       7.16Financial Conditions to Clong. . . . . . . . . . . . . . . . . . .34
                (a)Other Real Estate and Non-Performing Loans. . . . . . . . 34
                (b)Loan Loss Reserves. . . . . . . . . . . . . . . . .. . . .34

Section 8.CONDITIONS TO THE OBLIGATIONS OF MERCANTILE.. . . . .  . . . . . . 35

       8.1Representations and Warranties. . . . . . . . . . . .  . . . . . . 35
       8.2Compliance and Performance Under Agreement. . . . . . . . . . . . .35
       8.3Material Adverse Change. . . . . . . . . . . . . . . . . . . . . . 35
       8.4Approval of Agreement. . . . . . . . . . . . . . . . . . . . . . . 35
       8.5Officer's Certificate. . . . . . . . . . . . . . . . . . . . . . . 35
       8.6Opinion of Counsel. . . . . . . . . . . . . . . . . .  . . . . . . 35
       8.7Absence of Legal Impediment. . . . . . . . . . . . . .. . . . . . .35
       8.8Effectiveness of Registration Statement. . . . . . . . . . . . . . 36
       8.9Government Approvals. . . . . . . . . . . . . . . . .  . . . . . . 36
       8.10Tax Opinion or Ruling. . . . . . . . . . . . . . . . . . . . . . .36
       8.11Unaudited Financials. . . . . . . . . . . . . . . . .. . . . . . .36
       8.12Closing Documents. . . . . . . . . . . . . . . . . . . . . . . . .36
       8.13Fairness Opinion. . . . . . . . . . . . . . . . . . . . . . . . . 36

Section 9CLOSING.. . .. . . . . . . . . . . . . . . . . . . . . . . . . . . .36

       9.1Closing Date. . .. . . . . . . . . . . . . . . . . . . . . . . . . 36
       9.2Delivery of Documents. . .. . . . . . . . . . . . . . . . . . . . .36
       9.3Filings. . . . . . . . . .. . . . . . . . . . . . . . . . . . . . .36

Section 10.EXPENSES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

       10.1Merger Related Expenses. . . . . . . . . . . . . . . . . . . . . .37
       10.2Miscellaneous Mercantile Expenses. . . . . . . . . . . . . . . . .37

Section 11.AMENDMENT; TERMINATION. . . . . . . . . . . . . . . . . . . . . . 37


<PAGE>




                                TABLE OF CONTENTS
                                   (continued)

       11.1Amendment. . . . . . . . .  . . . . . . . . . . . . . . . . . . . 37
       11.2Termination. . . . . . . .  . . . . . . . . . . . . . . . . . . . 37
       11.3Termination. . . . . . . .  . . . . . . . . . . . . . . . . . . . 38
       11.4Breach of Obligations. . .  . . . . .. . . . . . . . . . . . . . .38
       11.5Termination and Expenses. .. . . . . . . . . . . . . . . . . . . .39

Section 12.MISCELLANEOUS. . . . . . . . . . . . . . . . . . . . . . . . . .  39

       12.1Notices. . . . . . . . . . . . . . . . . . . . . . . . . . . . .  39
       12.2Binding Agreement. . . . . . . . . .  . . . . . . . . . . . . . . 39
       12.3Survival of Representations and Warranties. . . . . . . . . . . . 40
       12.4Governing Law. . . . . . . . . . . . . . . . .. . . . . . . . . . 40
       12.5Attorneys' Fees. . . . . . . . . . . . . . . . . . . . . . . . . .40
       12.6Entire Agreement; Severability. . . . . . . ... . . . . . . . . . 40
       12.7Counterparts. . . . . . . . . . . . . . . . . . . . . . . . . . . 40



























<PAGE>













Plan of Acquisition and Merger



         THIS PLAN OF  ACQUISITION  AND  MERGER,  dated as of January  23,  1997
("Agreement"),   is  made  by  and  between  SierraWest  Bancorp,  a  California
corporation and a registered bank holding company under the Federal Bank Holding
Company Act of 1956 as amended ("BHC"),  SierraWest  Bank, a California  banking
corporation  (collectively "Sierra") and Mercantile,  a California state banking
corporation ("Mercantile").

WITNESSETH:

         A. The Boards of Directors of Sierra and  Mercantile  deem it advisable
and in the best  interests of Sierra,  Mercantile  and their  shareholders  that
Sierra and Mercantile enter into a business  combination whereby Sierra's wholly
owned  subsidiary,  SierraWest  Bank  a  California  state  banking  corporation
("Subsidiary") will be merged with Mercantile ("Merger"),  with Subsidiary being
the surviving corporation.

         B. The Merger  Agreement  attached as Exhibit A is intended to be filed
with the  California  Secretary of State ("Merger  Agreement")  when it has been
approved by the Superintendent of Banks of the State of California.

         C. The  Merger is  intended  to  qualify  as a tax free  reorganization
within the meaning of the provisions of Section 368 of the Internal Revenue Code
of 1986, as amended (the "IRC").

         D. Pursuant to the Merger, each Mercantile shareholder will receive, in
exchange  for each  share of  Mercantile  common  stock and cash,  the number of
shares of Sierra common stock  determined in accordance  with the Exchange Ratio
as more fully set forth in this Agreement ("Exchange Ratio").

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

         Section 1.  THE MERGER.

         1.1  Effective  Date.  Subject  to the  terms  and  conditions  of this
Agreement,  the Merger shall  become  effective at the date on which an executed
copy of the Merger  Agreement has been certified by the California  Secretary of
State  and filed  with the  Superintendent  of Banks of the State of  California
("Superintendent") pursuant to Section 2072 of the California Financial Code, in
each case on the  Closing  Date as  defined in  Section  9.1 hereof  ("Effective
Date").

         1.2 Effect of the Merger.  Subject to the terms and conditions of this
 Agreement, on the

                                     Page 1

<PAGE>



Effective  Date,  Mercantile  shall be merged with and into  Subsidiary  and the
Subsidiary shall be the surviving corporation  ("Surviving  Corporation") in the
merger.  All assets,  rights,  privileges,  immunities,  power,  franchises  and
interests of  Mercantile  in and to every type of property  (real,  personal and
mixed) and choses in action,  as they exist as of the Effective Date,  including
appointments, designations and nominations and all other rights and interests as
trustee,  executor,  administrator,  registrar of stocks and bonds,  guardian of
estate, assignee, receiver and in every other fiduciary capacity, shall pass and
be  transferred  to and vest in the  Subsidiary as the Surviving  Corporation by
virtue of the Merger on the Effective Date without any deed, conveyance or other
transfer;  the separate  existence of  Mercantile  shall cease and the corporate
existence of Subsidiary as the Surviving  Corporation shall continue  unaffected
and unimpaired by the merger;  and the Surviving  Corporation shall be deemed to
be the same entity as each of Mercantile  and Subsidiary and shall be subject to
all of their duties and liabilities of every kind and description. The Surviving
Corporation  shall  be  responsible  and  liable  for  all the  liabilities  and
obligations  of each of Subsidiary  and  Mercantile;  and any claim  existing or
action or  proceeding  pending by or against  Subsidiary  or  Mercantile  may be
prosecuted as if the Merger had not taken place,  or the  Surviving  Corporation
may be substituted  in its place.  Neither the rights of creditors nor any liens
upon the  property  of Sierra,  Subsidiary  or  Mercantile  shall be impaired by
reason of the Merger.  The articles of  incorporation of Subsidiary shall be the
articles  of  incorporation  of the  Surviving  Corporation  and the  bylaws  of
Subsidiary  shall be the bylaws of the Surviving  Corporation.  On the Effective
Date, Subsidiary shall assume the operations of, as successor to, Mercantile. On
the Effective  Date the board of directors of Subsidiary  will continue to serve
until  successors  are duly  elected and  qualified.  Subsidiary  shall remain a
wholly-owned subsidiary of Sierra.

Section 2.  CONVERSION AND CANCELLATION OF SHARES.

          2.1 Exchange Amount; Conversion of Shares of Mercantile Common Stock.

          (a)     For purposes of this Agreement, capitalized terms have the
                  following meanings:


Mercantile Shares                     Issued and  outstanding  shares of
                                      Mercantile   no  par  value  common  stock
                                      ("Mercantile  Shares") as of the Effective
                                      Date.


Exchange Amount                       The Exchange Amount, consisting of a Cash
                                      Component and a Stock Component, shall be
                                      $6,601,000 in the aggregate as adjusted
                                      pursuant to Section 2.1(c) below.  The
                                      Cash Component shall be reduced by the am-
                                      ount of cash allocated to holders of Merc-
                                      antile Shares who exercise dissenters'
                                      rights pursuant to California Corporations
                                      Code Section 1300 et. seq.


Cash Component                        Cash  portion  of the  Exchange Amount 
                                      equal to $3,300,500,  less one-half
                                      of the  amount  of any  adjustment  to the
                                      Exchange Amount pursuant to Section 2.1(c)
                                      below.


                                     Page 2

<PAGE>






Stock Component                       Newly issued shares of Sierra no par value
                                      common stock ("Sierra Shares") with an ag-
                                      gregate Market Value equal to the 
                                      $3,300,500, less one-half of the amount of
                                      any adjustment to the Exchange Amount pur-
                                      suant to Section 2.1(c) below; provided 
                                      however, the total number of newly issued
                                      shares of Sierra common stock shall not 
                                      exceed 250,000.


Per Share Cash Component              The  aggregate  Cash Component divided by
                                      the number of outstanding Mercantile 
                                      Shares  on  the Effective Date.


Per Share Stock Component             The aggregate Stock Component divided  by
                                      the   number  of outstanding   Mercantile 
                                      Shares  on  the Effective Date.


Exchange Ratio                        The Per Share Stock Component divided by
                                      the Market Value


Market Value                          The average of the closing prices of
                                      the  Sierra  Shares  as  reported  in  the
                                      western edition of the Wall Street Journal
                                      for  the 20  trading  days  preceding  the
                                      Determination   Date.   For   purpose   of
                                      determining the average, the divisor shall
                                      be  only  those  days  on  which  a  trade
                                      occurs.


Determination Date The fifth business day preceding the Effective Date.


Adjustment Date The last day of the month preceding the Determination Date.


         (b) On the  Effective  Date,  by virtue of the Merger and  without  any
action  on the  part  of the  holders  of  Mercantile  Shares,  the  outstanding
Mercantile  Shares  (other than any shares as to which  dissenters'  rights have
been  perfected)  shall be converted  into the right to receive a combination of
cash and shares of the common stock,  no par value,  of Sierra  ("Sierra  common
stock" or "Sierra Shares") with an aggregate value equal to the Exchange Amount.
The Cash Component shall be one-half of the Exchange Amount. The Stock Component
will comprise the balance of the Exchange Amount, provided that the total number
of Sierra  Share to be issued  shall not exceed  250,000.  In the event that the
Stock  Component of the  Exchange  Amount  reaches the maximum  number of Sierra
Shares, the Cash Component shall not be adjusted.

         (c)  The $6,601,000 Exchange Amount shall be adjusted as follows:

              (i) By subtracting  an amount derived by multiplying  .0744 by the
amount by which  Mercantile's  Core Deposits as of the Adjustment  Date are less
than $22.7 million.  Core Deposits shall be defined as total Mercantile deposits
("Total  Deposits")  less (i) all  certificates  of deposit;  (ii) all  brokered
deposits, wholesale deposits or deposits of other depository institutions; (iii)
deposits maintained by the officers,  directors or shareholders of Mercantile or
their related

                                     Page 3

<PAGE>



interests to the extent that such deposits  exceed $1 million in the  aggregate;
and (iv) deposits  opened or renewed after the date of the Definitive  Agreement
where the rate  exceeds  the rates  established  by Sierra for  similar  deposit
products. Total Deposits for purposes of this calculation shall be determined by
averaging the Total  Deposits  reflected on the books of  Mercantile  for the 20
business days preceding the Adjustment Date.

              (ii) By  subtracting  the amount by which the  Mercantile's  total
shareholder  equity as  adjusted  ("Adjusted  Shareholder  Equity") is less than
$4,912,000 or by adding the amount by which Adjusted  Shareholder Equity exceeds
$4,912,000.  Adjusted  Shareholder  Equity shall be computed in accordance  with
Generally  Accepted  Accounting   Principles  ("GAAP")  but  shall  reflect  the
following adjustments which may not be in accordance with GAAP:

                  (A) An amount  necessary to cause the reserves and/or accruals
allocated to each asset identified in Schedule 2.1(c) (including OREO) equal the
amount shown in column H+I of Schedule 2.1(c). A related tax adjustment shall be
made.  In the event that any asset shown on  Schedule  2.1(c) is  liquidated  or
repaid in whole or in part,  then such asset,  including  the  related  reserves
and/or  accruals,  shall be deleted in whole or in part from Schedule 2.1(c) and
the Adjusted Shareholder Equity as of the Adjustment Date.

                  (B) An amount  necessary  to cause  Mercantile's  general loan
loss  reserves  on the  Adjustment  Date for all assets  not listed on  Schedule
2.1(c)  equal  the  level  of  reserves   required  by  using  the  Mercantile's
calculation  methodology  in effect  as of  December  31,  1996.  A related  tax
adjustment shall be made.

                  (C) An amount of additional  reserves  reflecting  any adverse
change in  Mercantile's  assets as of the  Adjustment  Date and as determined in
accordance with Section 3.2(i). A related tax adjustment shall be made.

                  (D) The amount  necessary  to increase the  Valuation  Reserve
reflected  on  Mercantile's  books  to  offset  the  effect  of  any  additional
carry-forward  tax losses  resulting  from additions to  Mercantile's  loan loss
reserves or operating losses occurring after December 31, 1996.

         2.2   Cash/Stock Election.

         The Exchange  Amount will be allocated to the Stock  Component  and the
Cash  Component  in  accordance  the  following  election  and  procedures  (the
"Cash/Stock Election").

         Each Mercantile  shareholder may elect to receive his or her portion of
the Exchange  Amount in either all Sierra  shares or all cash. If no election is
made,  the  shareholder  will  receive  a Cash  Component  equal  to 50% of such
shareholder's  pro rata portion of the Exchange  Amount and a Stock Component of
50% of such shareholders pro rata portion of the Exchange Amount.

         The Cash/Stock Election is subject to the limitation that the aggregate
Cash Component for all Mercantile  shareholders may not be more than $3,300,500.
If the aggregate Cash Component is undersubscribed,  the unsubscribed portion of
this minimum  aggregate  Cash Component will be allocated pro rata (by number of
shares) among all  Mercantile  shareholders;  if the aggregate Cash Component is
oversubscribed,  the Cash Component of each Mercantile  shareholder  electing to
receive  cash will be reduced pro rata (by number of shares  electing to receive
cash) so that the aggregate Cash Component of all Mercantile  shareholders  will
equal

                                     Page 4

<PAGE>



$3,300,500, as adjusted. The total of the Cash Component and the Stock Component
will always equal the Exchange  Amount as adjusted and subject to the limitation
on the  total  number of  Sierra  Shares  to be  issued as part of the  Exchange
Amount.

         A  Mercantile  shareholder  need not,  and may not,  make a  Cash/Stock
Election  until after the Effective  Date.  Immediately  following the Effective
Date,  Sierra shall send to each Mercantile  shareholder a letter of transmittal
describing the Cash/Stock Election in more detail and providing forms for making
the Cash/Stock Election, as desired.

         The Cash/Stock  Election,  if made, must be made for all shares held in
the name of the  Mercantile  shareholder.  A  Mercantile  shareholder  who holds
shares in two or more  capacities  or in  different  names  may make a  separate
Cash/Stock Election for each name or capacity in which shares are held. However,
shares  represented  by a  single  certificate  may  make  only  one  Cash/Stock
Election.

         Mercantile   shareholders  who  make  a  Cash/Stock  Election  have  no
assurance  that  they  will  receive  all  cash  or all  stock  or any  specific
proportion thereof.

          2.3 Fractional Shares.  Notwithstanding any other provision hereof, no
fractional  shares  of  Sierra  common  stock  shall be  issued  to  holders  of
Mercantile Shares. In lieu thereof, each such holder entitled to a fraction of a
share of Sierra  common  stock shall  receive,  at the time of  surrender of the
certificate or certificates  representing  such holder's  Mercantile  Shares, an
amount  in cash  equal to the  Market  Value per  share of the  common  stock of
Sierra,  multiplied  by the fraction of a share of Sierra  common stock to which
such holder  otherwise  would be  entitled.  No such holder shall be entitled to
dividends,  voting  rights,  interest  on the value  of, or any other  rights in
respect of a fractional share.

         2.4  Surrender of Mercantile Shares.

         (a) Prior to the Effective Date, Sierra shall appoint any bank or trust
company  (having  capital  of at  least  $50  million)  mutually  acceptable  to
Mercantile and Sierra,  as exchange agent (the "Exchange Agent") for the purpose
of exchanging  certificates  representing the Mercantile Shares at and after the
Effective   Date,   Sierra  shall  issue  and  deliver  to  the  Exchange  Agent
certificates  representing  the  Sierra  Shares,  as  shall  be  required  to be
delivered to holders of  Mercantile  Shares.  As soon as  practicable  after the
Effective Date, each holder of Mercantile  Shares converted  pursuant to Section
2.1, upon surrender to the Exchange Agent of one or more  certificates  for such
Mercantile  Shares for  cancellation,  will be entitled to receive a certificate
representing  the number of Sierra Shares  determined in accordance with Section
2.1 and a payment in cash with  respect  to the Cash  Component  and  fractional
shares, if any, determined in accordance with Section 2.3.

         (b) No dividends or other  distributions of any kind which are declared
payable to  stockholders of record of the Sierra Shares after the Effective Date
will be paid to persons entitled to receive such  certificates for Sierra Shares
until such persons surrender their certificates  representing Mercantile Shares.
Upon surrender of such certificate  representing  Mercantile  Shares, the holder
thereof shall be paid,  without interest,  any dividends or other  distributions
with  respect to the Sierra  Shares as to which the record date and payment date
occurred on or after the Effective Date and on or before the date of surrender.

         (c) If any  certificate  for  Sierra  Shares  is to be issued in a name
other than that in which the  certificate for Mercantile  Shares  surrendered in
exchange therefor is registered, it shall be a

                                     Page 4

<PAGE>



condition of such exchange that the person requesting such exchange shall pay to
the  Exchange  Agent any transfer  costs,  taxes or other  expenses  required by
reason of the issuance of  certificates  for such Sierra  Shares in a name other
than the registered holder of the certificate surrendered, or such persons shall
establish to the  satisfaction of Sierra and the Exchange Agent that such costs,
taxes or other expenses have been paid or are not applicable.

         (d) All dividends or distributions, and any cash to be paid pursuant to
the Cash Component or Section 2.3 in lieu of fractional  shares,  if held by the
Exchange  Agent  for  payment  or  delivery  to  the  holders  of  unsurrendered
certificates representing Mercantile Shares and unclaimed at the end of one year
from the Effective  Date,  shall  (together with any interest earned thereon) at
such time be paid or redelivered by the Exchange Agent to Sierra, and after such
time any  holder of a  certificate  representing  Mercantile  Shares who has not
surrendered such certificate to the Exchange Agent shall,  subject to applicable
law,  look as a general  creditor only to Sierra for payment or delivery of such
dividends or distributions or cash, as the case may be.

         2.5 No Further  Transfers of Mercantile  Shares. At the Effective Date,
the stock  transfer  books of  Mercantile  shall be closed  and no  transfer  of
Mercantile Shares theretofore outstanding shall thereafter be made.

         2.6  Adjustments.  If,  between  the  date  of this  Agreement  and the
Effective Date, the outstanding Sierra common stock shall have been changed into
a  different   number  of  shares  or  a  different   class  by  reason  of  any
reclassification, recapitalization, split up, combination, exchange of shares or
readjustment,  or a stock dividend  thereon shall be declared with a record date
within such period,  the number of Sierra  Shares to be issued and  delivered in
the  Merger  in  exchange  for  each  outstanding   Mercantile  Share  shall  be
correspondingly adjusted. For purposes of this Section 2.6, conversion of Sierra
convertible debentures shall not be considered an adjustment to Sierra Shares.

          2.7   Personnel Matters.

         (a)  Employment At Effective  Date. Not later than 30 days prior to the
Determination Date, Sierra shall notify Mercantile in writing of those employees
who shall be eligible  for  employment  by Sierra or  Subsidiary  following  the
Effective Date. Any Mercantile employee who is not identified by Sierra as being
eligible for employment shall be terminated by Mercantile  immediately  prior to
the Effective Date.  Mercantile shall make severance payments to those employees
who are not  eligible  for  employment  by  Sierra in the  amount  for each such
employee of not less than two weeks  salary plus one  additional  week of salary
for each year served.  Mercantile may, in its sole  discretion,  make additional
special bonus payments to retain  employees who are deemed necessary to complete
the Merger.  All such payments  shall have been included in the  calculation  of
Adjusted  Shareholder  Equity  and shall be paid or  accrued  on or  before  the
Adjustment  Date.  Such  payments  shall  be  conditioned  upon the  receipt  of
enforceable  releases  from  such  employees.  In  terminating  such  employees,
Mercantile shall abide by all internal  policies and all legal  requirements for
termination of employment. From the date of this agreement through the Effective
Date,  Mercantile  shall  consult  with the human  resources  representative  of
Sierra,  who shall be designated  in writing to  Mercantile by Sierra,  and keep
that  representative  advised as to all matters related to employment.  From the
day of the Effective Date or any time thereafter, former employees of Mercantile
who are employed by Sierra  following  the  Effective  Date may be terminated by
Sierra,   with  or  without  cause,  for  any  reason  not  prohibited  by  law.
Notwithstanding  anything to the  contrary  described in this  paragraph  above,
Mercantile employee

                                     Page 5

<PAGE>



Denis Long shall be  eligible  for  employment  by Sierra  provided  that he and
Sierra  shall  have  agreed  to  the  terms  of  employment  on  or  before  the
Determination  Date;  provided,  in the event that he has not reached  agreement
with Sierra by such date, Mercantile shall have no obligation to terminate Denis
Long prior to the Effective Date.

         (b) Retirement  Benefits.  Employees of Subsidiary formerly employed by
Mercantile  on the  Effective  Date shall be eligible for  participation  in the
Sierra 401(k) plan and employee  stock option plan at the earliest  normal entry
date  following  the  Effective  Date  as  allowed  by  applicable  law  and the
provisions of Sierra's  benefit  plans,  so long as such employees then meet the
eligibility  requirements  for  participation  in the  Sierra  plan.  The former
employees  of  Mercantile  who are employed by  Subsidiary  will be credited for
years of prior  service  with  Mercantile  for vesting  (non-forfeitability)  of
accrued  benefits in the Sierra plans to the fullest extent such credit for such
prior  service  is  permitted  by  Sierra's  plans  and by the  laws,  rules and
regulations of the Internal Revenue Service and the Employee Income Security Act
of 1974, as amended.

         (c)  Other Benefit Plans.

                  (i) After the Effective  Date, any or all  Mercantile  welfare
benefit  plans shall be  terminated  by Sierra.  Subsidiary  employees  formerly
employed by Mercantile immediately prior to the Effective Date shall be eligible
for  participation  in any existing  Sierra plan, so long as such employee would
otherwise be eligible to participate in such plan.

                  (ii)Employees of Subsidiary formerly employed by Mercantile on
the Effective Date will receive credit for length of service with Mercantile for
determination  of eligibility or  participation in the Sierra (A) health service
plans, or (B) long-term disability, voluntary accident and life insurance plans.

         (d)  Other Benefits.

                  (i) Employees of Subsidiary formerly employed by Mercantile on
the Effective Date will retain vacation  benefits  accrued with Mercantile prior
to the  Effective  Date,  subject to  Sierra's  maximum  accrual  and  carryover
limitations  for such  benefits;  and will also  retain the amount of sick leave
benefit  eligibility on Mercantile's  records prior to the Effective Date, to be
available subject to Sierra's policy for sick leave benefits; provided, however,
Mercantile  shall  have  accrued  the  cost of such  benefits  on the  books  of
Mercantile on or before the Adjustment  Date.  Following the Effective Date, all
employees  shall be subject to the  standard  policies  of Sierra for accrual of
such benefits.

                  (ii)Employees of Subsidiary formerly employed by Mercantile on
the Effective  Date will be subject to the severance  policies in effect for all
Sierra employees.

Section 3.  COVENANTS OF THE PARTIES.

         3.1  Mutual Covenants.

         (a)  Government  Approvals.  Each  party will use its  reasonable  best
efforts in good faith to take or cause to be taken as  promptly  as  practicable
all such steps  within their  reasonable  control to obtain (i) the waiver of an
application  or prior  approval of the Merger by the Board of  Governors  of the
Federal  Reserve  System  ("FRB") under the BHC, (ii) the prior  approval of the
Superintendent  to the Merger;  (iii) the prior approval of the Federal  Deposit
Insurance Corporations ("FDIC") under the Bank Merger

                                     Page 6

<PAGE>



Act, and (iv) all other  consents and  approvals of  government  agencies as are
required by law or otherwise, and shall do any and all acts and things necessary
or  appropriate  in order to cause  the  Merger to be  consummated  on the terms
provided in the Merger  Agreement and this Agreement as promptly as practicable.
The  approvals  referred  to in  clauses  (i)-(iv)  of this  Section  3.1(a) are
hereinafter referred to as the "Government  Approvals." Each party shall respond
to a written  request  for  information  sought by the other for the  purpose of
obtaining  the  Government  Approvals  promptly  and in all cases within 10 days
after receipt of such request.

         (b)   Notification  of  Breach  of   Representations,   Warranties  and
Covenants. Each party shall promptly give written notice to the other party upon
becoming  aware of the  occurrence or impending or threatened  occurrence of any
event  which  would  cause  or  constitute  a  material  breach  of  any  of the
representations,  warranties or covenants of that party contained or referred to
in the Merger  Agreement or this  Agreement  and shall use its  reasonable  best
efforts to prevent the same or remedy the same promptly.

         (c)  Financial Statements.

                  (i) Each  party has  delivered  or shall  deliver to the other
party  promptly  after they become  available true and correct copies of audited
financial  statements  as of  such  date  and  covering  such  period  as may be
necessary to satisfy the minimum  requirements  of the  Securities  and Exchange
Commission  ("Commission")  and other  governmental  authorities having approval
authority over the Merger. The financial statements for such year ends have been
or shall be audited by their respective  independent certified public accounting
firms  which  have been  engaged  in the past and  include  or shall  include an
unqualified  opinion  of each such  accounting  firm,  to the  effect  that such
financial  statements  have been prepared in accordance  with GAAP  consistently
applied and present fairly, in all material respects, the consolidated financial
position,  results of operations and cash flows of the respective parties at the
dates indicated and for the periods then ending.

                  (ii) Each  party  shall  provide to the other  party  promptly
after  they  become  available  copies  of all  financial  statements  and proxy
statements  issued  or  to be  issued  to  either  party's  shareholders  and/or
directors after December 31, 1996, and at or prior to the Effective Date.

                  (iii) Each party has delivered or shall deliver,  to the other
party true and  complete  copies of its Annual  Report to  Shareholders  for the
years ended December 31, 1995,  1994 and 1993, all periodic  reports  (including
interim  quarterly  financial  statements)  since  December 31, 1993,  all proxy
statements  and other  written  material  furnished  to its  shareholders  since
December 31, 1993,  and all other  material  reports,  including  year-end  call
reports,  relating to Sierra and Mercantile  filed by Sierra and Mercantile with
the FRB , the  Superintendent  or the FDIC during 1993  through 1996 and in 1997
prior to the Effective Date. As of its date, each of the documents  described in
the preceding  sentence  complied or shall comply in all material  respects with
all legal and regulatory requirements applicable thereto.

         (d) Press  Releases.  Neither  party shall  issue any press  release or
written  statement for general  circulation  relating to this  Agreement  unless
previously  provided to the other party for review and approval  (which approval
will not be unreasonably withheld or delayed) and shall cooperate with the other
party in the development and  distribution of all news releases and other public
information disclosures with respect to the Merger, this Agreement or the Merger
Agreement;  provided  that  either  party may,  without the consent of the other
party,  make any  disclosure  with regard to this  Agreement that it determines,
upon advice of counsel, is required under any applicable law or regulation.

         (e)  Access to Properties, Books and Records; Confidentiality.  Prior 
to the Effective Date, each

                                     Page 7

<PAGE>



party shall (except as may be prohibited by applicable law) give the other party
and its officers,  employees,  agents and  representatives  full access,  during
normal  business hours and upon  reasonable  notice,  to all of its  properties,
books,  contracts,  records and  facilities  including,  but not limited to, the
corporate,  financial and operational records,  papers,  reports,  instructions,
procedures,  tax returns and filings, tax settlement letters, material contracts
or commitments,  regulatory  examinations and correspondences.  Each party shall
also use its reasonable best efforts to cause its independent accounting firm to
make available to the other party, its accountants, counsel and other agents, to
the extent reasonably requested in connection with such review, such firm's work
papers and documentation relating to its work papers and its audits of the books
and  records  of each  party.  Each  party  shall  make  available  to the other
originals or copies, at the responding  party's election,  of such documents and
records as the other may reasonably request. The availability or actual delivery
of  such  information  about  either  party  shall  not  affect  the  covenants,
representations  and warranties of either party  contained in this Agreement and
in the Merger  Agreement.  Each party shall  respond to any written  request for
information  promptly  and in all cases  within 10 days  after  receipt  of such
request. Each party shall use its reasonable best efforts to cause its officers,
directors,  employees, auditors and attorneys to cooperate with the other in its
reasonable  requests  for  information  except  that  no  information  which  is
reasonably  determined to be the subject of the attorney client  privilege shall
be required to be  disclosed.  Each party shall treat as  confidential  all such
information  in the  same  manner  as each  party  treats  similar  confidential
information of its own, and if this  Agreement is  terminated,  each party shall
continue  to treat  all  such  information  as  confidential  and to  cause  its
employees  to keep all such  information  confidential  and  shall  return  such
documents  therefore  delivered  by the  other  party as the other  party  shall
request, and shall use such information,  or cause it to be used, solely for the
purposes of evaluating  and  completing the  transactions  contemplated  hereby;
provided  that each  party  may  disclose  any such  information  to the  extent
required  by federal  or state  securities  laws or  otherwise  required  by any
governmental   agency  or  authority,   or  by  generally  accepted   accounting
principles. The foregoing confidentiality obligations shall not apply in respect
of any information publicly available or to any information  previously known to
the party in question, the use of which is not otherwise restricted.

         (f) Additional Agreements. In case at any time after the Effective Date
any further  action is  necessary or desirable to carry out the purposes of this
Agreement  or  to  vest  the  Surviving  Corporation  with  full  title  to  all
properties,  assets, rights, approvals,  immunities and franchises of any of the
parties to the Merger,  the proper  officers and directors of each party to this
Agreement  shall take all such necessary  action as may be reasonably  requested
by, and at the sole expense of, Sierra.  Pending the Effective Date,  Sierra and
Mercantile shall consult with one another and cooperate as reasonably  requested
by Sierra to  facilitate  the  integration  of their  respective  operations  as
promptly  as  practicable  after the  Effective  Date.  Such  cooperation  shall
include,  if requested,  communicating  with employees,  consultation  regarding
material  contracts,  renewals,  and capital  commitments  to be entered into by
Mercantile, coordination regarding third-party service agreements with a view to
providing common products and services as expeditiously as practicable following
the Effective  Date,  making  arrangements  for employee  training  prior to the
Effective  Date and taking action to  facilitate  an orderly  conversion of data
processing  operations to occur promptly following the Effective Date,  provided
that the  cooperation  required under this Section 3.1(f) shall not be deemed to
require actions that would materially delay or impede the Merger.

         (g) Advice of Changes.  Sierra and Mercantile shall promptly advise the
other party of any change or event having, or that would be reasonably likely to
have,  a material  adverse  effect on it or which it believes  would or would be
reasonably  likely  to cause  or  constitute  a  material  breach  of any of its
representations, warranties or covenants contained herein.

                                     Page 8

<PAGE>



         (h) Legal Conditions to Merger. Each of Sierra and Mercantile shall use
their  reasonable  best efforts (a) to take,  or cause to be taken,  all actions
necessary,  proper, or advisable to comply promptly with all legal  requirements
which may be imposed on such party with  respect to the Merger  and,  subject to
the respective  conditions  set forth in Sections 7 and 8 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  Mercantile  or Sierra in  connection
with the Merger and the other transactions contemplated by this Agreement.

         3.2  Covenants of Mercantile.

         (a) Approval by Shareholders.  Mercantile shall cause the Merger,  this
Agreement and the Merger Agreement to be submitted  promptly for the approval of
its shareholders in the most  expeditious  manner  available,  either by consent
solicitation of sufficient  shareholders to cause approval of the Merger or at a
meeting  to be called  and held in  accordance  with  applicable  laws.  If such
approval  is to be taken by meeting  Mercantile  shall cause  appropriate  proxy
materials  ("Proxy  Materials")  to be prepared and, if  necessary,  approved by
appropriate regulatory authorities as promptly as practicable and, when approved
or  otherwise  deemed  effective,  with any  amendments  thereto that may in the
judgment of its counsel be necessary or desirable,  to be mailed to shareholders
of  Mercantile.  Subject  to the  fiduciary  duty of the Board of  Directors  of
Mercantile,  the Proxy  Materials shall include  therein a  recommendation  that
Mercantile shareholders vote to approve the proposed Merger. The Proxy Materials
shall be subject to prior approval by Sierra. In the event that such is required
by applicable  securities laws,  Sierra shall prepare for inclusion in the Proxy
Materials an  appropriate  registration  statement/prospectus  which  Mercantile
shall assist with by providing such information and documents as may be required
in an  expeditious  and timely  manner.  Unless  approval is provided by consent
solicitation,  Mercantile shall hold its shareholder meeting as soon as possible
but no  later  than  June  15,  1997,  unless  prevented  from  doing  so by the
regulatory  authorities  or by delays in obtaining or conditions  imposed by the
Government   Approvals.   Subject  to  its  continuing  fiduciary  duty  to  the
shareholders of Mercantile,  the members of the Board of Directors of Mercantile
shall  at all  times  prior  to and  during  such  meeting  of its  shareholders
recommend that the transactions contemplated hereby be adopted and approved and,
subject to such duty, use its reasonable best efforts to cause such adoption and
approval.

         (b)  Compensation.  Except for standard  annual review of employees and
the normal wage  increases  incident  thereto and  subject to the  provision  of
Section 2.7(a) hereof,  Mercantile shall not make or approve any increase in the
compensation  payable  or to  become  payable  by it to any  of  its  directors,
officers, employees or agents (including but not limited to compensation through
any profit sharing, pension, retirement,  severance, incentive or other employee
benefit program or arrangement); nor shall any bonus payment or any agreement or
commitment  to make a bonus payment be made other than the  obligations  to make
distributions  reflecting 1996 profits under  Mercantile's  profit sharing plan,
nor shall any stock option,  warrant or other right to acquire  capital stock be
granted;  nor shall any existing employment  agreement be extended or renewed or
modified on terms more  favorable to the employee  than those that are currently
contained in such contract;  nor shall any employment  agreement (other than any
such employment  agreement that may arise by operation of law upon the hiring of
any new employee) or consulting agreement be entered into by Mercantile with any
such directors,  officers, employees or agents unless Sierra has given its prior
written consent. Without prior notification to Sierra, Mercantile shall not hire
any new employee at an annual rate in excess of current  customary  practice or,
in any event, in excess of $40,000 per year.

         (c)  Conduct of Business in the Ordinary Course.  Prior to the Effect-
ive Date:

                                     Page 9

<PAGE>



                  (i) Except as  expressly  contemplated  or  permitted  in this
Agreement,  Mercantile  shall conduct its  businesses in the Ordinary  Course as
heretofore conducted.  For purposes of this Agreement,  the "Ordinary Course" of
Mercantile  shall  consist  of  banking  and  related  businesses  as  presently
conducted or consistent with good banking practices or by it and permitted under
applicable laws. Unless Sierra has given its previous written consent to any act
or omission to the  contrary  (which  Sierra shall not  unreasonably  withhold),
Mercantile  shall,  until the  Effective  Date,  cause its officers to use their
reasonable best efforts to:

                      (A)      preserve its business and business organization
intact;

                      (B)      preserve the good will of customers and others 
having business relations with it and take no action that would impair the bene-
fit to the other party of the goodwill of it or the other benefits of the Mer-
ger;

                      (C)      consult with Sierra as to the making of any de-
cisions or the taking of any actions in matters  other than in the  Ordinary  
Course and  cooperate  with all reasonable  requests of Sierra that, in the 
reasonable  judgment of Sierra,  are necessary  to  successfully  complete  the
transactions  contemplated  by  this Agreement,  including permitting a desig-
nated  representative or representativesof  Sierra  to  attend  and  participate
(but not  vote) in all loan  committee meetings and board of directors  meet-
ings,  provided such Sierra  representative may be excluded  from any portion of
a board of directors  meeting which relates to the Merger or any examination  
report or response  thereto,  or is reasonably determined to be the subject of
the attorney client privilege;

                      (D)      maintain its properties in customary repair, 
working order and condition (reasonable wear and tear excepted);

                      (E)      comply in all material respects with all laws, 
regulations and decrees applicable to the conduct of its business;

                      (F)  keep in force at not less than its present limits all
policies of insurance, including deposit insurance of the FDIC, to the extent 
reasonably practicable in light of the prevailing market conditions in the in-
surance industry;

                      (G)       except as provided in Section 2.7(a) keep avail-
able to the other party the services of its present  officers and employees (it 
being  understood  that both parties shall have the right to terminate the  em-
ployment of any of its officers or employees in accordance with its established 
employment procedures);

                      (H)      comply in all material respects with all orders,
agreements and memoranda of understanding with respect to it made by or with 
any regulatory  authority of competent   jurisdiction,   and   promptly forward
to  the  other  party  all communications  received from any such authority that
are not prohibited by such authority  from being so  disclosed  and inform the 
other party of any  material restrictions imposed by any governmental authority 
on its business;

                      (I)  file in a timely manner (taking into account any ex-
tensions duly obtained) all reports, tax returns and other documents required to
be filed with federal, state, local and other authorities;

                      (J)  conduct an environmental audit prior to foreclosure 
on any property concerning which it has knowledge, or should have knowledge, 
that asbestos or asbestos-containing material, PCB's

                                     Page 10

<PAGE>



or PCB-contaminated  materials, any petroleum product, or hazardous substance or
waste (as defined under any  applicable  environmental  laws) was or is present,
manufactured,  recycled,  reclaimed,  released, stored, treated, or disposed of,
and  provide  the  results of such  audit to and  consult  with the other  party
regarding the  significance  of the audit prior to the  foreclosure  on any such
property;

                      (K)      not sell, lease, pledge, assign, encumber or 
otherwise dispose of any of its assets except other real estate owned or other 
property in the Ordinary Course, in each case for adequate  value,  without re-
course and  consistent  with its customary practice;

                      (L)      not make, renegotiate, renew, increase, extend or
purchase any loans, advances or loan  commitments,  in each  case to any of its
officers,  directors  or any affiliated  or  related  persons of such  directors
or  officers  except in the Ordinary  Course   consistent  with  its  establish-
ed  loan  procedures  and  in compliance with FRB Regulation O;

                      (M) not take any action to create, relocate or terminate 
the operations of any banking office or branch, or to form any new subsidiary or
affiliated entity;

                      (N) not settle or otherwise take any action to release or 
reduce any of its rights with respect to any litigation  involving a claim of 
more than $50,000 in which it is a party without the consent of Sierra which  
consent  shall not be  unreasonably withheld; and

                      (O)      maintain an allowance for loan losses which, in 
addition to meeting the requirements  of Section  2.1(c),  shall be in substan-
tial compliance  with the comments of the FDIC in its most recent Report of 
Examination.

                  (ii)Mercantile  shall not,  without first having  obtained the
written  consent of Sierra which  consent  shall not be  unreasonably  withheld,
cause its officers to:

                      (A)      commit itself to any loan or renewal or restruct-
ure of an existing loan with a principal amount in excess of $40,000 if unsecur-
ed,  or in excess of $80,000 and with a loan-to-value ratio above 75% if secured
by real property,  provided that Sierra's consent shall be deemed given unless 
it objects and states the basis of its objection in writing, or verbally with 
prompt written  confirmation,  within one business day after  receipt of written
notice  directed to the Chief Credit Officer of Sierra,  together with  suffici-
ent  supporting  information  to allow Sierra to make an informed judgment,  and
Sierra shall not unreasonably withhold its  consent;  provided,  further,  that 
any  consent  given by Sierra  shall be inding only if given by such person or 
persons who are identified in writing by Sierra;  provided,  further,  no loan 
with an  interest  rate below the rate for  loans  comparable  to rates for sim-
ilar  loans by Sierra  shall be  granted  or approved by Mercantile. Notwith-
standing any of the provisions of this paragraph, Mercantile  may proceed with 
making any loan not consented to by Sierra and such loan shall be added to 
Schedule  2.1(c), a reserve shall be established for such loan in accordance
with Sierra  methodology  and such loan shall be reviewed by the independent 
loan reviewer as set forth in Section 2.1(c)(ii)(C);

                      (B)      purchase or sell any investment security with a 
maturity in excess of three years;

                      (C)      issue any certificate of deposit with a rate of 
interest in excess of 50 basis points above the rate sheets provided weekly to 
Mercantile by Sierra; or

                      (D)      enter into or renew any contract having a dur-
ation extending beyond 9 months

                                     Page 11

<PAGE>



from the date of this Agreement, whether or not in the Ordinary Course.

                  (iii) It is understood  and agreed by the parties  hereto that
any  consent  sought of Sierra or  required  by  Mercantile  pursuant to Section
2.4(c)  or any other  provision  of this  Agreement  shall be deemed to be given
following five (5) business days advanced notice by Mercantile to Sierra,  which
notice shall  include such  information  as Sierra shall  reasonably  request or
unless the comments of Sierra have been addressed by Mercantile.

         (d)  No Merger or Solicitation.

                  (i) Prior to the Effective  Date,  Mercantile and its Board of
Directors  and officers  shall not initiate  negotiations  toward,  or otherwise
effect  or agree to  effect,  any  Business  Combination  involving  Mercantile,
acquire or agree to acquire  any of its own capital  stock or the capital  stock
(except in a fiduciary  capacity) or assets  (except in the Ordinary  Course) of
any other entity,  or commence any  proceedings  for winding up and  dissolution
affecting it. "Business  Combination" shall mean any Merger, sale or purchase of
a subsidiary,  sale or purchase of a substantial portion of any entity's assets,
or  tender  offer  or  other  means  of  acquisition  of  substantially  all the
outstanding capital stock of any entity.

                  (ii)Prior to the Effective  Date,  neither  Mercantile nor any
officer,  director  or  affiliate  of  Mercantile,  nor any  investment  banker,
attorney,  accountant  or other  agent,  advisor or  representative  retained by
Mercantile shall (A) solicit or initiate, directly or indirectly, any inquiries,
discussions or proposals  for,  continue,  propose or enter into  discussions or
negotiations  looking  toward,  or enter  into any  agreement  or  understanding
providing  for, any  Business  Combination  with  Mercantile;  or (B)  disclose,
directly  or  indirectly,   any  nonpublic   information  to  any   corporation,
partnership,  person or other entity or group concerning  Mercantile's  business
and properties or afford any such other party access to Mercantile's properties,
books or records  or  otherwise  assist or  encourage  any such  other  party in
connection with the foregoing  except in satisfaction of the Board of Directors'
fiduciary duties as determined on the advice of counsel; or (C) furnish or cause
to be furnished any information  concerning the business,  financial  condition,
operations,  properties or prospects of Mercantile to another person, having any
actual or  prospective  role with  respect  to any such  transaction,  provided,
however,  that  the  Mercantile  shall  not  be  prohibited  from  reviewing  or
responding in any way to unsolicited proposals involving such transactions.

                  (iii)  Mercantile  shall  notify  Sierra  immediately  of  the
details  of any  indication  of  interest  of  any  person,  corporation,  firm,
association  or group to acquire by any means a  controlling  interest  in it or
engage in any Business Combination with it.

         (e) Changes in Capital  Stock;  Dividends.  At or after the date hereof
and at or prior to the Effective Date,  except with the prior written consent of
Sierra or as otherwise provided in this Agreement:

                  (i) Mercantile  shall not amend its Articles of  Incorporation
or Bylaws;  make any change in its  authorized,  issued or  outstanding  capital
stock or any other equity security;  issue,  sell,  pledge,  assign or otherwise
encumber or dispose of, or  purchase,  redeem or otherwise  acquire,  any of its
shares of capital stock or other equity  securities or enter into any agreement,
call or  commitment  of any  character to do so; grant or issue any stock option
relating  to,  right to acquire,  or security  convertible  into,  shares of its
capital stock or other equity security;  purchase,  redeem,  retire or otherwise
acquire  (other than in a  fiduciary  capacity)  any shares of, or any  security
convertible  into,  capital stock or other equity security of its companies,  or
agree to do any of the foregoing, except as expressly provided herein;

                                     Page 12

<PAGE>



and

                  (ii)Mercantile shall not declare, set aside or pay any cash or
stock dividend or other distribution in respect of its common stock.

         (f) Employee Welfare Benefit Plans. Mercantile agrees that its employee
welfare benefit plans,  as defined in Section 3(1) of ERISA,  may be terminated,
frozen, modified or merged into Sierra's employee welfare benefit plans as of or
after the Effective Date, as determined by Sierra,  in each case consistent with
Section  4980B of the Internal  Revenue Code  ("IRC").  On the  Effective  Date,
Mercantile  employees will commence  participation  in Sierra's  welfare benefit
plans on the same terms as Sierra employees.

         (g) Shareholder  Lists and Other  Information.  After execution hereof,
Mercantile  shall from time to time make  available to Sierra,  upon request,  a
list of its shareholders  and their  addresses,  a list showing all transfers of
the its  common  stock and such other  information  as Sierra  shall  reasonably
request regarding both the ownership and prior transfers of Mercantile's  common
stock.

         (h) Capital  Commitments and Expenditures.  After the execution of this
Agreement,  no new  capital  commitments  shall be  entered  into and no capital
expenditures shall be made by Mercantile,  including but not limited to creation
of any  new  branches  and  acquisitions  or  leases  of real  property,  except
commitments  or  expenditures  within  existing  operating  and capital  budgets
furnished  to and  approved  by Sierra  and  commitments  and  expenditures  not
exceeding $15,000 in the aggregate.

         (i) Asset  Review.  Mercantile  shall  continue to engage its  internal
asset review  examiners to identify  potential  losses with respect to loans and
other assets on its books and who shall have  reviewed  all NPAs,  as defined in
Section 7.16(a) hereof,  and other classified or criticized  assets as of a date
within the end of the month  preceding the  Adjustment  Date.  Mercantile  shall
promptly  provide a copy of such  reports  to Sierra.  Between  the date of this
Agreement and the end of the month preceding the Adjustment  Date, all assets of
Mercantile,  including  classified  or criticized  and NPAs,  may be reviewed by
Sierra and Sierra  provide,  not later than the last day of the month  preceding
the  Adjustment  Date, a report  thereon to Mercantile  setting  forth  Sierra's
grading or other assessment  thereof  (including  accounting  treatment and loss
recognition) utilizing Mercantile's regular loan/OREO review criteria consistent
with GAAP and RAP.  Mercantile may either accept and implement  Sierra's grading
or other  assessments  (including  accounting  treatment  and loss  recognition)
concerning loans or OREO, or, if it does not agree with Sierra's  conclusions as
set forth in the report, refer the matter for resolution by the independent loan
and appraisal experts agreed to in writing by the parties (the "Independent Loan
Reviewer"  or  "Independent  Appraiser")  who shall  immediately  review  and/or
appraise said loan(s) or OREO utilizing  Mercantile's  regular  loan/OREO review
criteria consistent with GAAP and RAP. The parties agree that if the Independent
Loan Reviewer  believes it necessary to retain an  Independent  Appraiser (or if
such an Appraiser is required by the penultimate  sentence below), the selection
and  supervision  thereof of said Appraiser shall be at the discretion and under
the control of the Independent Loan Reviewer.  Mercantile agrees to recognize on
its  books  and  records  all loan  losses  and  record  all  OREO at their  net
realizable   value   (and   record   related   OREO   expenses)   based  on  the
review/appraisal  by the Independent  Loan Reviewer or Independent  Appraiser no
later  than the  Adjustment  Date.  Sierra  and  Mercantile  agree to accept the
determinations of the Independent Loan Reviewer and Independent Appraiser.  With
respect to any OREO, based on all known information available from time to time,
if it appears that the then current  independent  appraisals may not be accurate
or upon request of and at the expense of Sierra,  Mercantile  shall  immediately
obtain updated  independent  appraisals by an Independent  Appraiser  (utilizing
Mercantile's regular criteria consistent with GAAP and RAP) and

                                     Page 13

<PAGE>



provide  copies  of all  such  appraisals  to  Sierra.  Any  new  or  additional
writedowns or OREO expenses  shall be recorded  immediately  upon  receiving any
updated independent  appraisal.  The costs of the neutral loan reviewer shall be
shared equally by the parties.  Notwithstanding  the  foregoing,  nothing herein
shall require a reduction of the reserves as set forth on Schedule 2.1(c) except
as provided in Section 2.1(c)(ii)(A).

         3.3 Covenants of Sierra.

         (a)  Conduct of Business in the Ordinary Course.  Prior to the Effect-
ive Date:

                  (i) In the event that Sierra  undertakes  any  transaction  or
series of  transactions  outside the  ordinary  course of business  prior to the
Effective Date, as soon as is practicable following the determination to proceed
with such a  transaction  or  transactions,  Sierra  shall  advise  the board of
directors of Mercantile of such  determination.  For purposes of this Agreement,
the "Ordinary Course" of Sierra shall consist of banking and related  businesses
as permitted  under  applicable  banking laws.  Unless  Mercantile has given its
previous  written consent to any act or omission to the contrary,  Sierra shall,
until the  Effective  Date,  cause its  officers  to use their  reasonable  best
efforts to:

                      (A)  preserve its business and business organizations 
intact;

                      (B)  preserve the good will of customers and others having
business relations with it and take no action that would materially impair the 
benefit to the other party of the goodwill of it or the other benefits of the 
Merger;

                      (C)  maintain its properties in customary repair, working
 order and condition (reasonable wear and tear excepted);

                      (D)  comply with all laws, regulations and decrees applic-
able to the conduct of its business;

                      (E)  use its reasonable best efforts to keep in force at
not less than its present limits all policies of  insurance,  including  deposit
insurance  of the FDIC,  to the extent  reasonably  practicable in light of the 
prevailing  market conditions in the insurance industry;

                      (F)  comply with all orders, agreements and memoranda of 
understanding with respect to it made by or with any regulatory authority of 
competent jurisdiction;

                      (G)  file in a timely manner (taking into account any ex-
tensions duly obtained) all reports, tax returns and other documents required to
 be filed with federal, state, local and other authorities;

                      (H)  not sell, lease, pledge, assign, encumber or other-
wise dispose of any of its assets except for adequate value, without recourse 
and consistent with its customary practice; and

                      (I)  not make, renegotiate, renew, increase, extend or 
purchase any loans, advances or loan  commitments,  in each  case to any of its
officers,  directors  or any affiliated  or  related  persons of such  directors
or  officers  except in the Ordinary Course  consistent  with  its  established
loan  procedures  and  in compliance with FRB Regulation O.

                  (ii)It is understood and agreed by the parties hereto that any
consent sought of

                                     Page 14

<PAGE>



Mercantile  or  required  by  Sierra  pursuant  to  Section  2.4(c) or any other
provision  of this  Agreement  shall be  deemed to be given  following  five (5)
business  days  advanced  notice by Sierra to  Mercantile,  which  notice  shall
include such information as Mercantile  shall  reasonably  request or unless the
comments of Mercantile have been addressed by Sierra.



         (b)  Dividends.  At or  after  the date  hereof  and at or prior to the
Effective  Date,  except  with the prior  written  consent of  Mercantile  or as
otherwise provided in this Agreement, Sierra shall not declare, set aside or pay
any cash  dividend or other  distribution  in respect of its common  stock other
than,  in the  discretion  of the board of  directors  of Sierra,  regular  cash
dividends not to exceed $0.50 per share on an annual basis.

         (c)  Indemnification; Insurance.

              (i) In the event of any threatened or actual claim,  action, suit,
proceeding  or  investigation,   whether  civil,   criminal  or  administrative,
including,  without  limitation,  any such claim,  action,  suit,  proceeding or
investigation  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 of Mercantile  ("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 or officer of
Mercantile or any predecessor or (ii) this Agreement or any of the  transactions
contemplated hereby, whether in any case asserted or arising before or after the
Effective Date, 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  Date,  Sierra shall  indemnify and hold  harmless,  as and to the
fullest extent permitted by 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 Date),
the Indemnified Parties may retain counsel reasonably satisfactory to then after
consultation  with  Sierra;  provided,  however,  that (1) Sierra shall have the
right to assume the defense thereof and upon such assumption Sierra 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 Sierra 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 Sierra and the
Indemnified  Parties,  the  Indemnified  Parties may retain  counsel  reasonably
satisfactory to them after  consultation  with Sierra,  and Sierra shall pay the
reasonable  fees and expenses of such counsel for the Indemnified  Parties,  (2)
Sierra shall be obligated pursuant to this paragraph to pay for only one firm of
counsel for all  Indemnified  Parties,  unless an  Indemnified  Party shall have
reasonably  concluded;  based  on the  advice  of  counsel,  that in order to be
adequately  represented,  separate  counsel is  necessary  for such  Indemnified
Party,  in which  case,  Sierra  shall  be  obligated  to pay for such  separate
counsel,  (3) Sierra shall not be liable for any settlement effected without its
prior written  consent (which consent shall not be unreasonably  withheld),  and
(4) Sierra shall have no obligation  hereunder to any Indemnified Party when and
if a court  of  competent  jurisdiction  shall  ultimately  determine,  and such
determination shall have become final and nonappealable, that indemnification of
such  Indemnified  Party in the  manner  contemplated  hereby is  prohibited  by
applicable law. Any  Indemnified  Party wishing to claim  Indemnification  under
this

                                     Page 15

<PAGE>



Section 3.3(c),  upon learning of any such claim,  action,  suit,  proceeding or
investigation,  shall notify  Sierra  thereof,  provided  that the failure to so
notify shall not affect the  obligations  of Sierra  under this  Section  3.3(c)
except to the  extent  such  failure  to notify  materially  prejudices  Sierra.
Sierra's obligations under this Section 3.3(c) continue in full force and effect
for a period of four (4) years from the Effective Date; provided,  however, that
all rights to indemnification in respect of any claim ("Claim") asserted or made
within such period shall continue until the final  disposition of such Claim and
provided further that Sierra shall have the right of setoff against any payments
required to be made by Sierra to an  Indemnified  Party pursuant to this Section
3.3(c) to the  extent  that such  Indemnified  Party  shall  have  received  the
indemnification  to which such  Indemnified  Party is  entitled  from an insurer
under a directors'  and  officers'  liability  insurance  policy  maintained  by
Mercantile or Sierra.  As of the Effective  Date,  Sierra may in its  discretion
request that its insurance  carrier,  or  Mercantile's  insurance  carrier,  for
directors' and officers'  liability  insurance provide extended coverage for the
liability to the directors and officers of Mercantile  for such period as Sierra
deems appropriate.

              (ii)In the event  Sierra or any of its  successors  or assigns (A)
consolidates  with  or  merges  into  any  other  person  and  shall  not be the
continuing or surviving  corporation or entity of such  consolidation or merger,
or (B)  transfers  or conveys all or  substantially  all of its  properties  and
assets to any  person,  then,  and in each such case,  to the extent  necessary,
proper  provision  shall be made so that the  successors  and  assigns of Sierra
assume the obligations set forth in this section. The provisions of this Section
3.3(c) are intended to be for the benefit of, and shall be enforceable  by, each
Indemnified Party and his or her heirs and representatives.

Section 4.  REPRESENTATIONS AND WARRANTIES OF MERCANTILE.

         Mercantile  represents and warrants to Sierra that, except as set forth
on a Schedule  attached to this Agreement and  corresponding  in number with the
applicable section:

         4.1 Corporate Status and Power to Enter Into Agreements. (i) Mercantile
is a  banking  corporation  duly  incorporated,  validly  existing  and in  good
standing under  California law, (ii) subject to the Government  Approvals and to
the approval of this Agreement and the transactions  contemplated  hereby by the
shareholders  of  Mercantile,  Mercantile has all necessary  corporate  power to
enter into this  Agreement and the Merger  Agreement and to carry out all of the
terms  and  provisions  hereof  and  thereof  to be  carried  out by  it,  (iii)
Mercantile  holds a currently  valid  license  issued by the  Superintendent  to
engage in the business of  commercial  banking in  California  at its  principal
office in Sacramento, California and (iv) Mercantile is not subject to any order
of the  FDIC,  the  Superintendent  or any  other  regulatory  authority  having
jurisdiction  over its business or any of its assets or properties.  Neither the
scope of the business of Mercantile nor the location of its properties  requires
it to be licensed to do  business  in any  jurisdiction  other than the State of
California.  Mercantile's deposits are insured by the FDIC to the maximum extent
permitted by applicable law and regulation.

         4.2 Articles,  Bylaws, Books and Records. The copies of the Articles of
Incorporation  and  Bylaws of  Mercantile  heretofore  delivered  to Sierra  are
complete and accurate copies thereof as in effect on the date hereof. The minute
books of  Mercantile  made  available to Sierra  contain a complete and accurate
record of all  meetings  of  Mercantile's  Board of  Directors  (and  committees
thereof) and shareholders.  The corporate books and records (including financial
statements)  of Mercantile  fairly  reflect the material  transactions  to which
Mercantile is a party or by which its properties are subject or bound,  and such
books and records have been properly kept and maintained.

         4.3  Compliance With Laws, Regulations and Decrees.  Mercantile (i) has
the corporate power

                                     Page 16

<PAGE>



to own or  lease  its  properties  and to  conduct  its  business  as  currently
conducted,  (ii)  has  complied  with,  and  is  not in  default  of  any  laws,
regulations,  ordinances,  orders or decrees  applicable  to the  conduct of its
business and the ownership of its  properties,  including but not limited to all
federal  and state laws  (including  but not limited to the Bank  Secrecy  Act),
rules and regulations relating to the offer, sale or issuance of securities, and
the  operation  of a  commercial  bank other than  where such  noncompliance  or
default is not likely to result in a material  limitation  on the conduct of its
business  or is not  likely  to  otherwise  have a  material  adverse  effect on
Mercantile  taken as a whole,  (iii)  has not  failed  to file  with the  proper
federal, state, local or other authorities any material report or other document
required  to be filed,  and (iv) has all  approvals,  authorizations,  consents,
licenses,   clearances   and  orders  of,  and  has   currently   effective  all
registrations  with,  all  governmental  and  regulatory  authorities  which are
necessary to the business and operations of Mercantile as now being conducted.

         4.4 Capitalization. The authorized capital stock of Mercantile consists
of 1,000,000  shares of Mercantile  common stock, no par value, of which 336,980
are duly  authorized,  validly issued,  fully paid and  nonassessable  except as
provided  in  Section  662 of  the  California  Financial  Code,  and  currently
outstanding.  Said  stock has been  issued  in  compliance  with all  applicable
securities  laws.  There are no outstanding  (A) options,  agreements,  calls or
commitments  of any character  which would obligate  Mercantile to issue,  sell,
pledge,  assign or otherwise  encumber or dispose of, or to purchase,  redeem or
otherwise  acquire,  any Mercantile common stock or any other equity security of
Mercantile,  or (B) warrants or options relating to, rights to acquire,  or debt
or equity securities  convertible into, shares of Mercantile common stock or any
other equity security of Mercantile.

         4.5 Equity Interest in Any Entity. Except as collateral for outstanding
loans  held  in its  loan  portfolio,  Mercantile  does  not  own,  directly  or
indirectly, any equity interest in any bank, corporation or other entity.

         4.6 Financial Statements, Regulatory Reports. No financial statement or
other document to be provided to Sierra by Mercantile  under this Agreement,  as
of the date of such  document,  contained,  or as to  documents  to be delivered
after the date hereof,  will contain,  any untrue  statement of a material fact,
or, at the date thereof, omitted or will omit to state a material fact necessary
in order to make the statements contained therein, in light of the circumstances
under which such  statements  were or will be made,  not  misleading;  provided,
however,  that  information  as of a  later  date  shall  be  deemed  to  modify
information as of any earlier date.  Mercantile has filed all material documents
and reports required to be filed by it with the FDIC, the Superintendent and any
other governmental authority having jurisdiction over its business or any of its
assets or properties. All such reports conform in all material respects with the
requirements   promulgated  by  such  regulatory  agencies.  All  compliance  or
corrective  action relating to Mercantile  required by governmental  authorities
and regulatory  agencies  having  jurisdiction  over Mercantile have been taken,
including  compliance with any of the FDIC or the  Superintendent  in their most
recent Reports of  Examination.  Mercantile  has not received any  notification,
formally or informally,  from any agency or department of any federal,  state or
local  government  or any  regulatory  agency or the staff thereof (i) asserting
that it is not in compliance with any of the statutes, regulations or ordinances
which  such   government   or   regulatory   authority   enforces,   where  such
non-compliance  or default is likely to result in a material  limitation  on the
conduct of its  business or is not likely to otherwise  have a material  adverse
effect  on  Mercantile  taken as a whole,  or (ii)  threatening  to  revoke  any
license, franchise,  permit or governmental  authorization.  Mercantile has paid
all  assessments  made or imposed by any  governmental  agency.  Mercantile  has
delivered to Sierra copies of all annual  management  letters and opinions,  and
has made  available to Sierra for  inspection  all reviews,  correspondence  and
other  documents  in  the  files  of  Mercantile  prepared  by  its  independent
accounting  firm delivered to Mercantile  since December 31, 1995. The financial
records of Mercantile

                                     Page 17

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have been,  and are being and shall be,  maintained in all material  respects in
accordance with all applicable legal and accounting  requirements  sufficient to
insure that all transactions  reflected  therein are, in all material  respects,
executed in accordance with management's  general or specific  authorization and
recorded in conformity with generally accepted accounting principles at the time
in effect. The data processing equipment,  data transmission equipment,  related
peripheral  equipment  and software  used by  Mercantile in the operation of its
business to generate  and retrieve  its  financial  records are adequate for the
current needs of Mercantile.

         4.7  Tax Returns.

                  (i)  Mercantile has timely filed all federal,  state,  county,
local and  foreign tax returns  required to be filed by it,  including,  without
limitation,  estimated  tax,  use tax,  excise tax,  real  property and personal
property  tax reports and returns,  employer's  withholding  tax returns,  other
withholding  tax returns and Federal  Unemployment  Tax  Returns,  and all other
reports or other  information  required or requested to be filed by it, and each
such return,  report or other information was, when filed, complete and accurate
in all  material  respects.  Mercantile  has paid  all  taxes,  fees  and  other
governmental  charges,  including any interest and penalties thereon,  when they
have become due,  except  those that are being  contested  in good faith,  which
contested  matters have been  disclosed to Sierra and are  disclosed on Schedule
4.7 hereto. Mercantile has not been requested to give or has given any currently
effective waivers extending the statutory period of limitation applicable to any
tax return required to be filed by it for any period. Other than as disclosed in
writing  to  Sierra,  there are no claims  pending  against  Mercantile  for any
alleged  deficiency in the payment of any taxes, and Mercantile does not know of
any pending or threatened  audits,  investigations or claims for unpaid taxes or
relating  to any  liability  in  respect of any  taxes.  As to such tax  claims,
Mercantile  has accrued on its books an amount that is believed to be sufficient
to pay all such taxes, including interest and penalties that may be due, and has
reduced tangible  shareholders'  equity by such amount. There has been no event,
including  a change  in  ownership,  that  would  result  in a  reappraisal  and
establishment  of a new base-year  full value for purposes of Article  XIII.A of
the California  Constitution,  of any real property owned in whole or in part by
Mercantile  or to  Mercantile's  knowledge,  of  any  real  property  leased  by
Mercantile.

                  (ii)Mercantile  has  delivered to Sierra copies of all its tax
returns  with respect to taxes  payable to the United  States of America and the
State of California for the fiscal years ended December 31, 1994 and 1995.

                  (iii)    No consent has been filed relating to Mercantile pur-
suant to Section 341(f) of the IRC.

         4.8 Material Adverse Change.  Except as heretofore disclosed in writing
by  Mercantile  to  Sierra,  since  September  30,  1996,  there has been (i) no
material adverse change in the business, assets, licenses, permits,  franchises,
results of  operations or financial  condition of Mercantile  (whether or not in
the Ordinary Course), (ii) no change in any of the assets, licenses,  permits or
franchises  of Mercantile  that has had or can  reasonably be expected to have a
material adverse effect on any of the items listed in clause (i) above, (iii) no
damage,  destruction,  or  other  casualty  loss  (whether  or  not  covered  by
insurance) that has had or can reasonably be expected to have a material adverse
effect  on any of the  items  listed in clause  (i)  above,  (iv) no  amendment,
modification,  or  termination  of any  existing,  or entering  into of any new,
contract,  agreement, plan, lease, license, permit or franchise that is material
to the  business,  financial  condition,  assets,  liabilities  or operations of
Mercantile,  except in the Ordinary Course; and (v) no disposition by Mercantile
of one or more assets that,  individually  or in the aggregate,  are material to
Mercantile, except sales of assets in the Ordinary Course.

                                     Page 18

<PAGE>



         4.9 No  Undisclosed  Liabilities.  Except for items for which  reserves
have been  established or accrued and recorded in the audited  balance sheets of
Mercantile as of December 31, 1995,  Mercantile  has not incurred or discharged,
and is not  legally  obligated  with  respect  to  any  indebtedness,  liability
(including,  without limitation,  a liability arising out of an indemnification,
guarantee,  hold  harmless or similar  arrangement)  or  obligation  (accrued or
contingent, whether due or to become due, and whether or not subordinated to the
claims of its general  creditors),  other than as a result of  operations in the
Ordinary  Course after such date.  No  agreement  pursuant to which any loans or
other assets have been or will be sold by Mercantile  entitled the buyer of such
loans or other assets,  unless there is material breach of a  representation  or
covenant by the seller,  to cause  Mercantile to  repurchase  such loan or other
asset or the buyer to pursue  any other  form of  recourse  against  Mercantile.
Mercantile  has not  knowingly  made and  shall not make any  representation  or
covenant  in any such  agreement  that  contained  or shall  contain  any untrue
statement of a material  fact or omitted or shall omit to state a material  fact
necessary in order to make the  statements  contained  therein,  in light of the
circumstances  under which such  representations  and/or  covenants were made or
shall be made,  not  misleading.  No cash,  stock or other dividend or any other
distribution  with respect to the stock of  Mercantile  has been  declared,  set
aside or paid,  nor have any shares of the stock of Mercantile  been  purchased,
redeemed or otherwise  acquired,  directly or  indirectly,  by Mercantile  since
December 31, 1995.

         4.10  Properties and Leases.

         (a)  Mercantile has good and  marketable  title,  free and clear of all
liens  and  encumbrances  and the  right  of  possession,  subject  to  existing
leaseholds,  to all real properties and good title,  free and clear of all liens
and  encumbrances,  to all other property and assets,  tangible and  intangible,
reflected  in the  Mercantile  balance  sheet as of December  31,  1995  (except
property  held as lessee  under leases  disclosed  in writing  prior to the date
hereof and except personal property sold or otherwise disposed of since December
31, 1995, in the Ordinary Course), except (i) liens for taxes or assessments not
delinquent, (ii) such other liens and encumbrances and imperfections of title as
do not  materially  affect  the  value  of such  property  as  reflected  in the
Mercantile  balance sheet as of December 31, 1995, or as currently  shown on the
books and records of Mercantile  and which do not  interfere  with or impair its
present and  continued  use,  (iii)  exceptions  disclosed in title  reports and
preliminary  title  reports,  copies of which have been provided to Sierra.  All
tangible  properties  of  Mercantile  conform in all material  respects with all
applicable  ordinances,  regulations and zoning laws. All tangible properties of
Mercantile  are in a good state of  maintenance  and repair and are adequate for
the  current  business of  Mercantile.  No  properties  of  Mercantile,  and, to
Mercantile's  knowledge,  no  properties  in  which  it  holds a  collateral  or
contingent  interest  or  purchase  option,  are the  subject of any  pending or
threatened  investigation,  claim or proceeding  relating to the use, storage or
disposal on such property of or  contamination  of such property by any toxic or
hazardous  waste material or substance.  To Mercantile's  knowledge,  Mercantile
does not own,  possess or have a collateral or  contingent  interest or purchase
option in any properties or other assets which contain or have located within or
thereon any hazardous or toxic waste  material or substance  unless the location
of such hazardous or toxic waste material or other  substance or its use thereon
conforms in all material respect with all federal,  state and local laws, rules,
regulations or other  provisions  regulating the discharge of materials into the
environment.  As to any asset not owned or leased by Mercantile,  Mercantile has
not  controlled,  directed or participated in the operation or management of any
such asset or any facilities or enterprise  conducted thereon,  such that it has
become an owner or operator of such asset under applicable environmental laws.

         (b) All properties held by Mercantile under leases are held by it under
valid,  binding and enforceable leases, with such exceptions as are not material
and do not  interfere  with the  conduct  of the  business  of  Mercantile,  and
Mercantile enjoys quiet and peaceful possession of such leased property.

                                     Page 19

<PAGE>



Mercantile is not in default in any respect under any material lease,  agreement
or obligation  regarding its properties to which it is a party or by which it is
bound.

         (c)  Except as  disclosed  to Sierra in  writing,  all of  Mercantile's
rights and obligations  under the leases referred to in Section (b) above do not
require the consent of any other party to the transactions  contemplated by this
Agreement and the Merger  Agreement.  Where required,  Mercantile  shall obtain,
prior to the Effective Date, the consent of all parties to any such transaction.

         4.11 Material  Contracts.  Except as previously  disclosed to Sierra in
writing and excluding  loans,  lines of credit,  loan  commitments or letters of
credit to which Mercantile is a party,  Mercantile is not a party to or bound by
any  contract or other  agreement  made in the Ordinary  Course  which  involves
aggregate  future payments by or to Mercantile of more than $20,000 and which is
made for a fixed period  expiring  more than one year from the date hereof,  and
Mercantile  is not a party to or bound by any agreement not made in the Ordinary
Course  which is to be  performed  at or  after  the  date  hereof.  Each of the
contracts and agreements disclosed to Sierra pursuant to this Section is a legal
and binding obligation (subject to applicable bankruptcy, insolvency and similar
laws affecting creditors' rights generally and subject, as to enforceability, to
equitable  principles  of  general  applicability),  and no  material  breach or
default (and no condition which,  with notice or passage of time, or both, could
become a material breach or default) exists with respect thereto.

         4.12 Loans.  Mercantile has disclosed to Sierra in writing prior to the
date  hereof,  and will  promptly  inform  Sierra of the  amounts  of all loans,
leases,  other  extensions of credit or commitments,  or other  interest-bearing
assets  of  Mercantile,  that  have  been  classified  as of the date  hereof or
hereafter by any internal  bank  examiner or any bank  regulatory  agency or the
Superintendent  as  "Other  Loans  Specially   Mentioned,"   "Special  Mention,"
"Substandard,"  "Doubtful,"  "Loss," or words of  similar  import in the case of
loans  (or  that  would  have  been  so   classified,   in  the  case  of  other
interest-bearing assets, had they been loans). Mercantile has furnished and will
continue to furnish to Sierra true and accurate information  concerning the loan
portfolio of Mercantile,  and no material  information  with respect to the loan
portfolio has been or will be withheld from Sierra. All loans and investments of
Mercantile are legal,  valid and binding  obligations  enforceable in accordance
with its terms and are not  subject to any  setoffs,  counterclaims  or disputes
(subject  to  applicable  bankruptcy,  insolvency  and  similar  laws  affecting
creditors'  rights  generally and subject,  as to  enforceability,  to equitable
principles of general  applicability),  except as disclosed to Sierra in writing
or reserved for in the balance sheet of Mercantile as of September 30, 1996, and
were duly authorized  under and made in compliance  with applicable  federal and
state laws and  regulations.  Mercantile does not have any extensions of credit,
investments, guarantees,  indemnification agreements or commitments for the same
(including without limitation  commitments to issue letters of credit, to create
acceptances,  or to repurchase securities,  federal funds or other assets) other
than those documented on the books and records of Mercantile.

         4.13  Restrictions on Investments.  Except for pledges to secure public
and trust deposits and repurchase agreements in the Ordinary Course, none of the
investments  reflected in the Mercantile unaudited balance sheet as of September
30, 1996, and none of the  investments  made by Mercantile  since  September 30,
1996, is subject to any  restriction,  whether  contractual or statutory,  which
materially  impairs  the  ability  of  Mercantile  to  freely  dispose  of  such
investment  at  any  time  except  as  restricted  by  any  applicable  banking,
securities or government regulations.

                                     Page 20

<PAGE>



         4.14  Employment Contracts and Benefits.

         (a)  Mercantile  shall deliver to Sierra an accurate list setting forth
all bonus, incentive compensation,  profit-sharing,  pension,  retirement, stock
purchase,  stock  option,  deferred  compensation,  severance,  hospitalization,
medical, dental, vision, group insurance,  death benefits,  disability and other
fringe  benefit  plans,  trust  agreements,   arrangements  and  commitments  of
Mercantile  (including but not limited to such plans,  agreements,  arrangements
and  commitments  applicable to former  employees or retired  employees,  or for
which such  persons  are  eligible),  if any,  together  with copies of all such
plans, agreements, arrangements and commitments that are documented, any and all
contracts of employment and has made available to Sierra any Board of Directors'
minutes (or committee minutes) authorizing, approving or guaranteeing such plans
and contracts.

         (b) All  contributions,  premiums or other payments due from Mercantile
to (or  under)  any plan  listed  in  subsection  (a) have  been  fully  paid or
adequately  provided for through periodic accruals or otherwise on its unaudited
financial  statements  for the period ended  September  30,  1996.  All accruals
thereon  (including,  where  appropriate,   proportional  accruals  for  partial
periods)  have  been  made in  accordance  with  generally  accepted  accounting
principles consistently applied on a reasonable basis.

         (c) To  Mercantile's  knowledge,  each plan  listed in  subsection  (a)
complies  with  all  material  requirements  of (i)  the Age  Discrimination  in
Employment  Act of 1967, as amended,  and the  regulations  thereunder  and (ii)
Title VII of the Civil  Rights  Act of 1964,  as  amended,  and the  regulations
thereunder.

         (d) To  Mercantile's  knowledge,  each plan  listed in  subsection  (a)
complied with all material requirements of the health care continuation coverage
provisions of the Consolidated Omnibus Budget Reconciliation Act of 1985 and the
regulations thereunder.

         (f) Mercantile has heretofore  disclosed in writing to Sierra the names
of each director, officer and employee of Mercantile.

         4.15  Collective  Bargaining  and  Employment  Agreements.   Except  as
provided in this  Agreement  or as  previously  disclosed  to Sierra in writing,
Mercantile  does  not  have  any  union  or  collective  bargaining  or  written
employment agreements, contracts or other agreements with any labor organization
or with any member of management,  or any management or  consultation  agreement
not terminable at will by Mercantile  without  liability and no such contract or
agreement has been requested by, or is under  discussion by management with, any
group of employees,  any member of management or any other person.  There are no
material  controversies  pending  between  Mercantile  and any current or former
employees,  and to Mercantile's knowledge,  there are no efforts presently being
made by any labor union seeking to organize any of such employees.

         4.16  Compensation  of Officers  and  Employees.  Except as  previously
disclosed  to Sierra in writing,  (i) no officer or employee  of  Mercantile  is
receiving  aggregate direct  remuneration at a rate exceeding $60,000 per annum,
and (ii) the consummation of the transactions contemplated by this Agreement and
the  Merger  Agreement  will not  (either  alone or upon the  occurrence  of any
additional  or  further  acts or  events)  result  in any  payment  (whether  of
severance  pay or  otherwise)  becoming  due from  Mercantile  or  Sierra to any
employee of Mercantile.

         4.17 Legal Actions and Proceedings.  Except as previously  disclosed to
Sierra in writing,  Mercantile is not a party to, or so far as either of them is
aware,  threatened with, and to Mercantile's  knowledge,  there is no reasonable
basis for,  any legal action or other  proceeding  or  investigation  before any
court,  any arbitrator of any kind or any government  agency,  and Mercantile is
not subject to any
                                     Page 21

<PAGE>



potential  adverse  claim,  the  outcome of which  could  involve the payment or
receipt by Mercantile  of any amount in excess of $50,000,  unless an insurer of
Mercantile  has agreed to defend  against  and pay the  amount of any  resulting
liability  without  reservation,  or,  if any  such  legal  action,  proceeding,
investigation  or claim will not involve the payment by Mercantile of a monetary
amount,  which could materially  adversely affect  Mercantile or its business or
property or the transactions contemplated hereby. Mercantile has no knowledge of
any pending or threatened  claims or charges  under the  Community  Reinvestment
Act,  before  the  Equal  Employment  Opportunity  Commission,   the  California
Department of Fair Housing & Economic Development,  the California  Unemployment
Appeals Board,  or any human  relations  commission.  There is no labor dispute,
strike, slow-down or stoppage pending or, to Mercantile's knowledge,  threatened
against Mercantile.

         4.18  Execution and Delivery of the Agreement.

         (a) The  execution  and  delivery  of this  Agreement  have  been  duly
authorized  by the Board of Directors of Mercantile  and, when the Merger,  this
Agreement and the Merger  Agreement  have been duly approved by the  affirmative
vote of the holders of a majority of the outstanding shares of Mercantile common
stock at a meeting of  shareholders  duly  called  and held,  the  Merger,  this
Agreement and the Merger  Agreement  will be duly and validly  authorized by all
necessary corporate action on the part of Mercantile.

         (b) This  Agreement  has been duly executed and delivered by Mercantile
and (assuming due execution and delivery by Sierra) constitutes,  and the Merger
Agreement  upon its  execution  and  delivery by  Mercantile  (and  assuming due
execution and delivery by Sierra) will constitute, legal and binding obligations
of Mercantile 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  creditor's
rights and remedies generally.

         (c) The execution and delivery by Mercantile of this  Agreement and the
Merger  Agreement and the  consummation of the  transactions  herein and therein
contemplated  (i) do not violate any provision of the Articles of  Incorporation
or Bylaws of Mercantile or, to Mercantile's knowledge,  any provision of federal
or state law or any governmental rule or regulation (assuming (A) receipt of the
Government  Approvals,  (B)  receipt  of the  requisite  Mercantile  shareholder
approval,  (C) due registration of the Sierra Shares under the Securities Act of
1933, as amended ("1933 Act"),  (D) receipt of appropriate  permits or approvals
under  state   securities   or  "blue  sky"  laws,   and  (E)  accuracy  of  the
representations of Sierra set forth herein), and (ii) to Mercantile's knowledge,
do not require any consent of any person except as contemplated herein, conflict
with or result in a breach of, or accelerate the performance  required by any of
the terms of, any material debt instrument,  lease, license, covenant, agreement
or  understanding  to which Mercantile is a party or by which it is bound or any
order,  ruling,  decree,  judgment,  arbitration  award or  stipulation to which
Mercantile  is subject,  or  constitute  a default  thereunder  or result in the
creation of any lien, claim, security interest, encumbrance, charge, restriction
or right of any third party of any kind whatsoever upon any of the properties or
assets of Mercantile.

         4.19  Retention  of Broker or  Consultant.  No broker,  agent,  finder,
consultant  or other party  (other than legal,  compliance,  loan  auditors  and
accounting  advisors)  has been retained by Mercantile or is entitled to be paid
based upon any agreements,  arrangements or understandings made by Mercantile in
connection  with any of the  transactions  contemplated by this Agreement or the
Merger  Agreement,  except that Mercantile has engaged  Carpenter and Company to
render an opinion regarding the fairness of the Merger. Mercantile shall provide
Sierra with a true and accurate  copy of its  agreement(s)  with such firm.  All
costs related to such opinion shall be paid or accrued prior to the

                                     Page 22

<PAGE>



Effective Date.

         4.20 Insurance.  Mercantile is and continuously since its inception has
been, insured with reputable insurers against all risks normally insured against
by California  commercial  banks,  and all of the  insurance  policies and bonds
maintained  by  Mercantile  are in full force and effect,  Mercantile  is not in
default thereunder and all material claims thereunder have been filed in due and
timely  fashion.  In the best  judgment of the  management of  Mercantile,  such
insurance coverage is adequate for Mercantile.  Except as disclosed to Sierra in
writing, there has not been any damage to, destruction of, or loss of any assets
of  Mercantile  not covered by insurance  that could  materially  and  adversely
affect  the  business,  financial  condition,  properties,  assets or results of
operations of Mercantile.

         4.21 Loan Loss Reserves.  To the knowledge of Mercantile's  management,
the allowance  for loan losses as of the Effective  Date will be adequate in all
material  respects under the  requirements  of all applicable  state and federal
laws and  regulations to provide for possible loan losses on outstanding  loans,
net of recoveries.

         4.22 Transactions With Affiliates.  Except as may arise in the Ordinary
Course,  Mercantile has not extended credit,  committed itself to extend credit,
or  transferred  any asset to or  assumed or  guaranteed  any  liability  of the
employees or directors of Mercantile,  or any spouse or child of any of them, or
to any of their  "affiliates"  or "associates" as such terms are defined in Rule
405 under the 1933 Act.  Mercantile has not entered into any other  transactions
with the  employees or directors of  Mercantile or any spouse or child of any of
them, or any of their  affiliates or associates,  except as disclosed in writing
to  Sierra.  Any such  transactions  have  been on terms  no less  favorable  to
Mercantile than those which would prevail in an arms-length  transaction with an
independent third party.

         4.23  Information in Sierra  Registration  Statement.  The  information
pertaining to Mercantile which has been or will be furnished to Sierra for or on
behalf of Mercantile for inclusion in the Sierra Registration  Statement and the
Proxy  Materials,  or in the  applications  to be filed to obtain the Government
Approvals  ("Applications"),  does not and will not contain any untrue statement
of any material  fact or omits or will omit to state any material  fact required
to be stated  therein or necessary to make the statements  therein,  in light of
the circumstances under which they are made, not misleading;  provided, however,
that information of a later date shall be deemed to modify  information as of an
earlier  date.  All financial  statements  of  Mercantile  included in the Proxy
Materials will present fairly the financial  condition and results of operations
of  Mercantile  at the dates and for the periods  covered by such  statements in
accordance with generally accepted accounting  principles  consistently  applied
throughout the periods  covered by such  statements.  Mercantile  shall promptly
advise Sierra in writing if prior to the Effective Date Mercantile  shall obtain
knowledge of any facts that would make it necessary to amend or  supplement  the
Sierra Registration Statement, the Proxy Materials or the Applications, in order
to make the statements therein not misleading or to comply with applicable law.

         4.24 Accuracy of Representations  and Warranties.  No representation or
warranty by  Mercantile,  and no statement  by  Mercantile  in any  certificate,
agreement,   schedule  or  other  document  furnished  in  connection  with  the
transactions contemplated by this Agreement or the Merger Agreement, contains or
will contain any untrue  statement  of a material  fact or omits or will omit to
state any  material  fact  necessary  to make such  representation,  warranty or
statement not misleading to Sierra; provided,  however, that information as of a
later date shall be deemed to modify information as of an earlier date.

Section 5.  REPRESENTATIONS AND WARRANTIES OF SIERRA.

         Sierra represents and warrants to Mercantile that, except as set forth
on a Schedule attached to

                                     Page 23

<PAGE>



this Agreement and corresponding in number to the appropriate section:

         5.1 Corporate Status and Power to Enter Into Agreements.  (i) Sierra is
a corporation  duly  incorporated,  validly  existing and in good standing under
California  law, and is a registered bank holding company under the Bank holding
Company Act of 1956, as amended,  (ii) subject to the approval of this Agreement
and the transactions  contemplated hereby by the  Superintendent,  the FDIC and,
unless waived,  the FRB, Sierra has all necessary  corporate power to enter into
this  Agreement  and the Merger  Agreement and to carry out all of the terms and
provisions  hereof and  thereof to be carried  out by it,  (iii)  Sierra's  bank
subsidiary is duly licensed to engage in the commercial  banking business as now
conducted by it, and (iv) neither Sierra nor any of its  subsidiaries is subject
to any order of the FRB, the FDIC, the  Superintendent  or any other  regulatory
authority  having  jurisdiction  over  its  business  or any of  its  assets  or
properties.  Neither the scope of the business of Sierra nor the location of its
properties  requires it to be licensed to do business in any jurisdictions other
than states of California and Nevada.

         5.2 Articles,  Bylaws, Books and Records. The copies of the Articles of
Incorporation and Bylaws of Sierra made available to Mercantile are complete and
accurate  copies  thereof as in effect on the date  hereof.  The minute books of
Sierra contain a complete and accurate summary of all meetings of Sierra's Board
of Directors (and committees thereof) and shareholders.  The corporate books and
records (including  financial  statements) of Sierra fairly reflect the material
transactions  to which Sierra is a party or by which its  properties are subject
or bound, and such books and records have been properly kept and maintained.

         5.3 Compliance With Laws,  Regulations and Decrees.  Sierra (i) has the
corporate  power to own or lease its  properties  and to conduct its business as
currently conducted,  (ii) has complied with, and is not in default of any laws,
regulations,  ordinances,  orders or decrees  applicable  to the  conduct of its
business and the ownership of its  properties,  including but not limited to all
federal  and state laws  (including  but not limited to the Bank  Secrecy  Act),
rules and regulations relating to the offer, sale or issuance of securities, and
the  operation  of a commercial  bank,  other than where such  noncompliance  or
default is not likely to result in a material  limitation  on the conduct of the
business of Sierra or is not likely to otherwise have a material  adverse effect
on  Sierra  taken as a whole,  (iii)  has not  failed  to file  with the  proper
federal, state, local or other authorities any material report or other document
required to be to filed, and (iv) has all approvals,  authorizations,  consents,
licenses,   clearances   and  orders  of,  and  has   currently   effective  all
registrations  with,  all  governmental  and  regulatory  authorities  which are
necessary to the business and operations of Sierra as now being conducted.

         5.4  Capitalization.  As of November 30, 1996, the  authorized  capital
stock of Sierra  consists of 10,000,000  shares of Sierra  common stock,  no par
value, of which 2,754,569 are duly  authorized,  validly issued,  fully paid and
nonassessable  and currently  outstanding,  9,800,000  shares of preferred stock
none of which is outstanding, 200,000 shares of series A preferred stock none of
which are issued or outstanding and $8,705,000 of Sierra debentures  convertible
into  870,500  shares of Sierra  common  stock.  Said  stock has been  issued in
compliance with all applicable  securities laws. There are currently outstanding
options to purchase 384,080 shares of Sierra common stock, at a weighted average
exercise  price of $9.47 per share,  issued  pursuant  to its 1996 Stock  Option
Plan.  Said options were issued and, upon issuance in accordance  with the terms
of the outstanding  options said shares shall be issued,  in compliance with all
applicable  securities  laws.  Sierra has adopted a Board of Directors  Deferred
Compensation  and Stock Award Plan under which the members of Sierra's  Board of
Directors  can  elect to  defer  earned  director  compensation  and  take  such
compensation  upon retirement from the Board either in the form of Sierra Shares
or in cash. Otherwise, there are no outstanding (i) options,  agreements,  calls
or commitments  of any character  which would  obligate  Sierra to issue,  sell,
pledge,

                                     Page 24

<PAGE>



assign or otherwise encumber or dispose of, or to purchase,  redeem or otherwise
acquire, any Sierra common stock or any other equity security of Sierra, or (ii)
warrants or options relating to, rights to acquire, or debt or equity securities
convertible  into, shares of Sierra common stock or any other equity security of
Sierra.  The  outstanding  common  stock of  Sierra  has been  duly and  validly
registered with the Commission  pursuant to the 1934 Act, to the extent required
thereunder.

         5.5 Financial Statements, Regulatory Reports. No financial statement or
other document to be provided to Mercantile by Sierra under this  Agreement,  as
of the date of such  document,  contained,  or as to  documents  to be delivered
after the date hereof,  will contain,  any untrue  statement of a material fact,
or, at the date thereof, omitted or will omit to state a material fact necessary
in order to make the statements contained therein, in light of the circumstances
under which such  statements  were or will be made,  not  misleading;  provided,
however,  that  information  as of a  later  date  shall  be  deemed  to  modify
information as of any earlier date. Sierra has filed all material  documents and
reports  required to be filed by it with the FRB, the  Commission  and any other
governmental  authority  having  jurisdiction  over its  business  or any of its
assets or properties. All such reports conform in all material respects with the
requirements   promulgated  by  such  regulatory  agencies.  All  compliance  or
corrective  action relating to Sierra  required by governmental  authorities and
regulatory  agencies  having  jurisdiction  over  Sierra  or  any  of  its  bank
subsidiaries have been taken. Sierra has not received any notification, formally
or  informally,  from any agency or  department  of any federal,  state or local
government or any  regulatory  agency or the staff thereof (i) asserting that it
is not in compliance with any of the statutes,  regulations or ordinances  which
such government or regulatory authority enforces,  or (ii) threatening to revoke
any license,  franchise,  permit or governmental authorization of Sierra. Sierra
has paid all assessments made or imposed by any governmental agency.  Sierra has
delivered to Mercantile  copies of all annual  management  letters and opinions,
and has made available to Mercantile for inspection all reviews,  correspondence
and other  documents in the files of Sierra prepared by Deloitte & Touche or any
other  certified  public  accountant  engaged by Sierra and  delivered to Sierra
since  December 31, 1995.  The financial  records of Sierra have been, are being
and  shall  be  maintained  in all  material  respects  in  accordance  with all
applicable  legal and  accounting  requirements  sufficient  to insure  that all
transactions  reflected  therein  are,  in all  material  respects,  executed in
accordance with management's  general or specific  authorization and recorded in
conformity with generally accepted accounting  principles at the time in effect.
The data processing equipment,  data transmission equipment,  related peripheral
equipment  and  software  used by Sierra in the  operation  of its  business  to
generate and retrieve its  financial  records are adequate for the current needs
of Sierra.

                                     Page 25

<PAGE>



         5.6  Tax Returns.

         (a) Sierra has  timely  filed all  federal,  state,  county,  local and
foreign tax returns required to be filed by it, including,  without  limitation,
estimated  tax, use tax,  excise tax,  real  property and personal  property tax
reports and returns,  employer's  withholding tax returns, other withholding tax
returns and Federal  Unemployment  Tax Returns,  and all other  reports or other
information  required or  requested  to be filed by each of them,  and each such
return,  report or other  information was, when filed,  complete and accurate in
all material  respects.  Sierra has paid all taxes, fees and other  governmental
charges,  including  any interest and penalties  thereon,  when they have become
due,  except  those that are being  contested  in good  faith,  which  contested
matters have been  disclosed to Mercantile.  Except as set forth below,  neither
Sierra nor any of its  subsidiaries  has been requested to give or has given any
currently  effective  waivers  extending  the  statutory  period  of  limitation
applicable  to any tax  return  required  to be filed by  either of them for any
period. Except as set forth below, there are no claims pending against Sierra or
any of its subsidiaries for any alleged  deficiency in the payment of any taxes,
and Sierra does not know of any pending or threatened audits,  investigations or
claims for unpaid taxes or relating to any liability in respect of any taxes.

         (b) No consent has been filed  relating  to Sierra  pursuant to Section
341(f) of the IRC.

         5.7 Material Adverse Change.  Except as heretofore disclosed in writing
by Sierra to Mercantile,  since  September 30, 1996,  there has been no material
adverse change in the business, assets, licenses, permits,  franchises,  results
of operations or financial  condition of Sierra  (whether or not in the Ordinary
Course).

         5.8 Legal Actions and  Proceedings.  Except as previously  disclosed to
Mercantile in writing,  Sierra is not a party to, or so far as either of them is
aware, threatened with, and to Sierra's knowledge,  there is no reasonable basis
for, any legal action or other proceeding or investigation before any court, any
arbitrator of any kind or any  government  agency,  and Sierra is not subject to
any potential  adverse claim,  the outcome of which could involve the payment or
receipt  by Sierra of any  amount in excess of  $200,000,  unless an  insurer of
Sierra  has  agreed  to  defend  against  and pay the  amount  of any  resulting
liability  without  reservation,  or,  if any  such  legal  action,  proceeding,
investigation  or claim  will not  involve  the  payment by Sierra of a monetary
amount,  which  could  materially  adversely  affect  Sierra or its  business or
property or the transactions contemplated hereby. Sierra has no knowledge of any
pending or threatened  claims or charges under the Community  Reinvestment  Act,
before the Equal Employment Opportunity Commission, the California Department of
Fair Housing & Economic Development,  the California Unemployment Appeals Board,
or any human relations commission.  There is no labor dispute, strike, slow-down
or stoppage pending or, to the knowledge of Sierra, threatened against Sierra.

         5.9  Execution and Delivery of the Agreement.

         (a) The Merger,  this Agreement and the Merger Agreement have been duly
and validly authorized by all necessary corporate action on the part of Sierra.

         (b) This  Agreement  has been duly executed and delivered by Sierra and
(assuming due execution and delivery by Mercantile) constitutes,  and the Merger
Agreement, upon its execution and delivery by Sierra (and assuming due execution
and delivery by Mercantile)  will constitute,  legal and binding  obligations of
Sierra in accordance with its terms.

         (c)  The execution and delivery by Sierra of this Agreement and the 
Merger Agreement and the

                                     Page 26

<PAGE>



consummation  of the  transactions  herein and therein  contemplated  (i) do not
violate any provision of the Articles of  Incorporation  or Bylaws of Sierra or,
to Sierra's knowledge, any provision of federal or state law or any governmental
rule or regulation  (assuming (A) receipt of the Government  Approvals,  (B) due
registration of the Sierra Shares under the 1933 Act, (C) receipt of appropriate
permits or approvals under state securities or "blue sky" laws, and (D) accuracy
of the  representations  of Mercantile set forth  herein),  and (ii) to Sierra's
knowledge,  do not  require any consent of any person  under,  conflict  with or
result in a breach of, or  accelerate  the  performance  required  by any of the
terms of, any material debt instrument,  lease, license, covenant,  agreement or
understanding  to which  Sierra is a party or by which it is bound or any order,
ruling,  decree,  judgment,  arbitration award or stipulation to which Sierra is
subject,  or  constitute a default  thereunder  or result in the creation of any
lien, claim, security interest, encumbrance, charge, restriction or right of any
third  party of any kind  whatsoever  upon any of the  properties  or  assets of
Sierra.

           5. 10 No Undisclosed Liabilities. Except for items for which reserves
have been established in the audited balance sheets of Sierra as of December 31,
1995,  Sierra has not incurred or discharged,  and is not legally obligated with
respect  to  any  indebtedness,  liability  (including,  without  limitation,  a
liability arising out of an indemnification, guarantee, hold harmless or similar
arrangement) or obligation (accrued or contingent, whether due or to become due,
and whether or not subordinated to the claims of its general  creditors),  which
would have a material  effect on the capital or earnings of Sierra other than as
a result of  operations  in the Ordinary  Course  after such date.  Other than a
possible cash dividend by Sierra payable to  shareholders of record as of March,
1997, no cash, stock or other dividend or any other distribution with respect to
the stock of Sierra has been declared, set aside or paid, nor have any shares of
the stock of Sierra been purchased,  redeemed or otherwise acquired, directly or
indirectly, by Sierra since December 31, 1995.

           5. 11 No Material Environmental  Liabilities.  To Sierra's knowledge,
Sierra does not own,  possess or have a  collateral  or  contingent  interest or
purchase  option in any properties or other assets which contain or have located
within or thereon any hazardous or toxic waste material or substance  unless the
location of such hazardous or toxic waste material or other substance or its use
thereon conforms in all material respect with all federal, state and local laws,
rules,  regulations  or other  provisions  regulating the discharge of materials
into the  environment  the  liability  of  remediation  for which  would cause a
material adverse change in the capital or earnings of Sierra.

          5.12 No Material  Liabilities  Under ERISA. No governmental  agency or
claimant or representative of such claimant have alleged a material violation of
ERISA by Sierra the liability for which, if adversely  determined,  would result
in a material adverse change in the capital or earnings of Sierra.

           5.13 Retention of Broker or  Consultant.  No broker,  agent,  finder,
consultant  or other party  (other than legal,  compliance,  loan  auditors  and
accounting advisors) has been retained by Sierra or is entitled to be paid based
upon any agreements, arrangements or understandings made by Sierra in connection
with  any of the  transactions  contemplated  by this  Agreement  or the  Merger
Agreement.

           5. 14 Loan Loss  Reserves.  To the knowledge of Sierra's  management,
the  allowance for loan losses in the Sierra  balance sheet dated  September 30,
1996,  and as of the  Effective  Date are and will be adequate  in all  material
respects under the  requirements  of all  applicable  state and federal laws and
regulations  to provide for possible loan losses on  outstanding  loans,  net of
recoveries,  including  compliance  with  the  comments  of the FDIC in its most
recent Report of Examination.

                                     Page 27

<PAGE>



         5.15  Information in Sierra  Registration  Statement.  The  information
pertaining  to Sierra  which has been or will be  furnished  for or on behalf of
Sierra  for  inclusion  in  the  Sierra  Registration  Statement  or  the  Proxy
Materials,  or in the  Applications,  does not and will not  contain  any untrue
statement of any material  fact or omits or will omit to state any material fact
required to be stated  therein or necessary to make the statements  therein,  in
light of the circumstances under which they are made, not misleading;  provided,
however,  that information of a later date shall be deemed to modify information
as of an earlier date. All financial  statements of Sierra included in the Proxy
Materials will present fairly the financial  condition and results of operations
of Sierra  at the  dates  and for the  periods  covered  by such  statements  in
accordance with generally accepted accounting  principles  consistently  applied
throughout the periods covered by such statements.  Sierra shall promptly advise
Mercantile  in  writing  if prior to the  Effective  Date  Sierra  shall  obtain
knowledge  of any  facts  that  would  make it  necessary  to amend  the  Sierra
Registration Statement, the Proxy Materials or any Application, or to supplement
the  prospectus,  in order to make the  statements  therein not misleading or to
comply with applicable law.

         5.16 Accuracy of Representations  and Warranties.  No representation or
warranty by Sierra,  and no statement by Sierra in any  certificate,  agreement,
schedule  or other  document  furnished  in  connection  with  the  transactions
contemplated by this Agreement or the Merger Agreement, contains or will contain
any  untrue  statement  of a  material  fact or omits or will  omit to state any
material fact necessary to make such  representation,  warranty or statement not
misleading to Mercantile; provided, however, that information as of a later date
shall be deemed to modify information as of an earlier date.

Section 6.  SECURITIES ACT OF 1933; SECURITIES AXCHANGE ACT OF 1934.

         6.1 Preparation and Filing of Registration  Statement.  Unless exempted
from  registration  by Section  3(a)(10) of the 1933 Act,  Sierra shall promptly
prepare and file with the Commission a registration statement on the appropriate
form ("Sierra  Registration  Statement") under and pursuant to the provisions of
the 1933 Act for the purpose of  registering  the Sierra  Shares to be issued in
the Merger. Sierra and Mercantile shall promptly prepare Proxy Materials for the
purpose of submitting the Merger, this Agreement and the Merger Agreement to the
shareholders of Mercantile for approval.  Sierra and Mercantile  shall cooperate
in all  reasonable  respects  with  regard  to  the  preparation  of the  Sierra
Registration  Statement  and  the  Proxy  Materials.   The  Proxy  Materials  in
definitive  form are expected to serve as the  prospectus  to be included in the
Sierra Registration Statement. Sierra and Mercantile shall each provide promptly
to the other such  information  concerning its business and financial  condition
and  affairs as may be  required  or  appropriate  for  inclusion  in the Sierra
Registration  Statement or the Proxy Materials,  and shall cause its counsel and
auditors to cooperate with the other's  counsel and auditors in the  preparation
of the Sierra Registration Statement and the Proxy Materials.

         6.2  Effectiveness  of  Registration  Statement  and Listing of Shares.
Sierra and Mercantile shall use their  commercially  reasonable  efforts to have
the Sierra  Registration  Statement and any  amendments or  supplements  thereto
declared  effective  under the 1933 Act as soon as  practicable,  and thereafter
Mercantile  shall  distribute the Proxy Materials to holders of its common stock
in accordance with applicable  laws.  Sierra shall use  commercially  reasonable
efforts to cause the Sierra  Shares  issued to effect the Merger to be  approved
for listing on the Nasdaq  National  Market  System when such Sierra  Shares are
issued to Mercantile's shareholders.

         6.3  Sales and Resales of Common Stock.  Sierra shall not be required 
to maintain the effectiveness of the Sierra Registration Statement for the pur-
pose of sale or resale of the Sierra Shares by any person.

                                     Page 28

<PAGE>



         6.4  Rule 145 and  Related  Matters.  At  Sierra's  option,  securities
representing  Sierra Shares issued to  "affiliates",  as that term is defined in
the 1933 Act, of Mercantile (as determined by counsel to Sierra and  Mercantile)
under Rule 145 of the Rules and  Regulations  under the 1933 Act pursuant to the
Merger  Agreement  will be  subject  to stop  transfer  orders  and will  bear a
restrictive legend in substantially the following form:

                  "The  Securities  Represented  by this  Certificate  Have been
                  Issued in a Transaction  to Which Rule 145  Promulgated  under
                  the Securities  Act of 1933, as Amended,  Applies and May Only
                  Be  Sold or  Otherwise  Transferred  in  Compliance  with  the
                  Requirements   of  Rule  145  or  Pursuant  to  an   Effective
                  Registration  Statement  under  Said  Act or in a  Transaction
                  Which,  in the Opinion of Counsel  Satisfactory to the Issuer,
                  satisfies an Exemption from Such Registration."

Should any opinion of counsel  described in clause (ii) of the foregoing  legend
indicate that the legend and any stop transfer order then in effect with respect
to the shares may be removed,  Sierra will upon  request  substitute  unlegended
securities and remove any stop transfer orders.

Section 7.  CONDITIONS TO THE OBLIGATIONS OF SIERRA.

         The  obligations  of Sierra  under this  Agreement  are, at its option,
subject  to  fulfillment  at or  prior  to the  Effective  Date  of  each of the
following conditions; provided, however, that any one or more of such conditions
may be waived by the Board of Directors of Sierra at any time at or prior to the
Effective Date:

         7.1 Representations and Warranties.  The representations and warranties
of  Mercantile  in Section 4 hereof  shall be true and  correct in all  material
respects on and as of the  Effective  Date,  with the same effect as though such
representations and warranties had been made on and as of such date except as to
any representation or warranty which specifically relates to an earlier date.

         7.2 Compliance and Performance  Under Agreement.  Mercantile shall have
performed and complied in all material respects with all terms of this Agreement
and the Merger  Agreement  required to be performed or complied with by it at or
prior to the Effective Date.

         7.3 Material  Adverse Change.  No materially  adverse change shall have
occurred  since  September  30, 1996, in the  business,  financial  condition or
results of operations of Mercantile and  Mercantile  shall not be a party to or,
so far as Mercantile is aware,  threatened  with, and to Mercantile's  knowledge
there is no reasonable  basis for, any legal action or other  proceeding  before
any  court,  any  arbitrator  of any kind or any  Government  agency  if, in the
reasonable  judgment of Sierra, such legal action or proceeding could materially
adversely affect Mercantile, or its business,  financial condition or results of
operations.

         7.4 Approval of Agreement.  The Merger,  this  Agreement and the Merger
Agreement shall have been duly approved by the  affirmative  vote of the holders
of a majority of the outstanding shares of Mercantile common stock.

         7.5 Officer's  Certificate.  Sierra shall have received a  certificate,
dated the Effective Date, signed on behalf of Mercantile by its President to the
effect that the conditions in Sections 7.1-7.4 have been satisfied.

                                     Page 29

<PAGE>



         7.6 Opinion of Counsel.  Mercantile shall have delivered to Sierra such
documents as may  reasonably  be requested by Sierra to evidence  compliance  by
Mercantile  with the  provisions  of this  Agreement  and the Merger  Agreement,
including  an opinion of its  counsel  in a form  substantially  as set forth on
Exhibit 7.6.

         7.7 Absence of Legal Impediment. On the Effective Date, the absence of:
(a) any suit, action or proceeding,  or order against  Mercantile or Sierra with
respect to any part of this Agreement, or the Merger, or challenging, enjoining,
or otherwise  affecting the  consummation of the Merger which, in the opinion of
counsel for Sierra,  materially  affects the Merger or the  consummation of this
Agreement;  or (b) any pending or threatened  action or proceeding by the United
States  Department of Justice or other federal  governmental  agency  seeking to
enjoin,  prohibit or otherwise impede the Merger; or (c) a banking moratorium or
other  suspension  of  payment  by banks in the  United  States  or any  general
limitation on extension of credit by lending banks in the United States.

         7.8 Effectiveness of Registration Statement. The Sierra common stock to
be issued to  Mercantile  shareholders  shall have been  determined to be exempt
from  registration  or the Sierra  Registration  Statement and any amendments or
supplements  thereto  shall have  become  effective  under the 1933 Act. No stop
order suspending the  effectiveness of such  Registration  Statement shall be in
effect  and no  proceedings  for such  purpose  shall  have  been  initiated  or
threatened  by or before the  Commission.  All state  securities  and "blue sky"
permits or approvals  required to consummate the  transactions  contemplated  by
this Agreement and the Merger Agreement shall have been received.

         7.9 Government Approvals.  All Government Approvals shall be in effect,
and all conditions or requirements prescribed by law or by any such Governmental
Approval  shall  have been  satisfied;  provided,  however,  that no  Government
Approval  shall  be  deemed  to have  been  received  if it  shall  require  the
divestiture  or  cessation  of any  of  the  present  businesses  or  operations
conducted by either of the parties hereto or shall impose any other condition or
requirement, which Sierra in its reasonable judgment shall deem to be materially
burdensome (in which case Sierra shall promptly notify Mercantile). For purposes
of this Agreement no condition shall be deemed to be "materially  burdensome" if
such condition does not materially  differ from conditions  regularly imposed by
the FRB, the  Superintendent,  or FDIC in orders  approving  transactions of the
type  contemplated  by this Agreement and compliance  with such condition  would
not:

         (a)  require the taking of any action inconsistent with the manner in 
which Sierra or Mercantile has conducted its business previously;

         (b)  have a material adverse effect upon the business, financial con-
dition or results of operations of Sierra or Mercantile; or

         (c)  preclude satisfaction of any of the conditions to consummation of 
the transactions contemplated by this Agreement.

         7.10 Tax Opinion.  Sierra and Mercantile shall have received an opinion
of counsel or accountants  satisfactory to both parties,  subject to assumptions
and exceptions normally included, in form and substance reasonably  satisfactory
to both parties,  substantially  to the effect that under federal income tax law
and California income and franchise tax law:

         (a)  The Merger will comply with the requirements of Internal Revenue
Code Section 368;

         (b)  Except for the Cash Component of the Exchange Amount and any cash 
received in lieu of any

                                     Page 30

<PAGE>



fractional  share,  no gain or loss will be  recognized by holders of Mercantile
Shares who receive  Sierra  Shares in exchange for the  Mercantile  Shares which
they hold;

         (c) The holding period of Sierra Shares exchanged for Mercantile Shares
will  include the  holding  period of the  Mercantile  Shares for which they are
exchanged,  assuming the shares of Mercantile  Shares are capital  assets in the
hands of the holder thereof at the Effective Date; and

         (d) The basis of the Sierra Shares received in the exchange will be the
same as the basis of the Mercantile  Shares for which they are  exchanged,  less
any basis  attributable to the Cash Component or to fractional  shares for which
cash is received.

         7.11  Unaudited  Financials.  Not later  than the  Determination  Date,
Mercantile  shall have  furnished  Sierra a copy of its most  recently  prepared
unaudited  consolidated financial statements for the period beginning January 1,
1997 and ending the  monthend  immediately  preceding  the  Determination  Date,
including a balance sheet and statement of income of Mercantile for that period.

         7.12 Rule 145 Undertaking.  Each director,  executive officer and other
person who is an "affiliate" (for purposes of Rule 145 under the Securities Act)
of such party shall have delivered to Sierra,  as soon as practicable  after the
date of this Agreement,  and prior to the date of the shareholder meeting called
by Mercantile to approve this  Agreement,  a written  agreement,  in the form of
Exhibit 7.12 hereto,  providing that such person will not sell, pledge, transfer
or otherwise  dispose of any Sierra Shares to be received by such "affiliate" in
the  Merger,  except  in  compliance  with  the  applicable  provisions  of  the
Securities Act and the rules and  regulations  thereunder.  Notwithstanding  any
other  provision of this  Agreement,  no certificate  for Sierra Shares shall be
delivered in exchange for  Mercantile  Shares held by any such  "affiliate"  who
shall not have executed and delivered such an agreement.

         7.13  Closing Documents.  Sierra shall have received such certificates 
and other closing documents as counsel for Sierra shall reasonably request.

         7.14 Consents.  Mercantile  shall have  received,  or Sierra shall have
satisfied itself that Mercantile will receive,  all consents of other parties to
and  required by material  mortgages,  notes,  leases,  franchises,  agreements,
licenses  and  permits  applicable  to  Mercantile,  in each  case  in form  and
substance  reasonably  satisfactory to Sierra, and no such consent or license or
permit shall have been withdrawn or suspended.

         7.15 Shareholder Agreements. All directors of Mercantile and the Brooks
Trust shall have entered  into a  shareholder's  agreement in the form  attached
hereto as Exhibit 7.15 contemporaneously with the execution of this Agreement by
which such  shareholders  agree to vote their  shares and any shares  over which
such  shareholders  have  voting  authority  in favor of the Merger and  further
agreeing,  to the extent permitted by law and the bylaws of Mercantile,  to vote
in favor of the Merger by consent solicitation.

          7.16  Financial  Conditions to Closing.  The books of Mercantile as of
the  Adjustment  Date  and as of  Closing  shall  reflect  compliance  with  the
following financial conditions:

         (a) Other Real Estate and Non-Performing Loans. Mercantile's other real
estate owned ("OREO"),  non-performing  loans ("NPAs") (those loans not accruing
interest on Mercantile's books), loans 90 days or more past due, and other loans
under regulatory  requirements classified as substandard or non-performing shall
not exceed $2.495 million and the ratio of OREO and NPAs to  Shareholder  Equity
plus Allowance for Loan Losses ("ALL") shall not exceed 42.5%.


                                     Page 31

<PAGE>



         (b) Loan Loss  Reserves.  Mercantile  shall  maintain an ALL of no less
than $962 thousand,  less reserves  deleted from Schedule 2.1(c) pursuant to the
terms of Section 2.1(c)(ii)(A),  and 2.95% of total loans, whichever is greater,
and a ratio of ALL to NPAs of not less than 38.5% ("Coverage Ratio").

Section 8.  CONDITIONS TO THE OBLIGATIONS OF MERCANTILE.

         The obligations of Mercantile  under this Agreement are, at its option,
subject  to the  fulfillment  at or prior to the  Effective  Date of each of the
following conditions provided,  however, that any one or more of such conditions
may be waived by the Board of Directors of Mercantile at any time at or prior to
the Effective Date:

         8.1 Representations and Warranties.  The representations and warranties
of Sierra in Section 5 hereof shall be true and correct in all material respects
on  and  as  of  the  Effective  Date  with  the  same  effect  as  though  such
representations and warranties had been made on and as of such date except as to
any representation or warranty which specifically related to an earlier date.

         8.2  Compliance  and  Performance  Under  Agreement.  Sierra shall have
performed  and complied in all material  respects  with all of the terms of this
Agreement and the Merger Agreement  required to be performed or complied with by
them at or prior to the Effective Date.

         8.3 Material  Adverse Change.  No materially  adverse change shall have
occurred since September 30, 1996, in the business, financial condition, results
of operations or properties of Sierra and its subsidiaries taken as a whole, and
Sierra  shall  not be  engaged  in,  or a party to or so far as Sierra is aware,
threatened with, and to Sierra's knowledge no grounds shall exist for, any legal
action or other  proceeding  before any court, any arbitrator of any kind or any
government  agency if, in the  reasonable  judgment  of  Mercantile,  such legal
action or proceeding could  materially  adversely affect Sierra or its business,
financial condition, results of operations or assets.

         8.4 Approval of Agreement.  The Merger,  this  Agreement and the Merger
Agreement shall have been duly approved by the  affirmative  vote of the holders
of a majority of the outstanding shares of Mercantile common stock.

         8.5   Officer's   Certificate.   Mercantile   shall  have   received  a
certificate,  dated  the  Effective  Date,  signed  on  behalf  of Sierra by its
President and Chief  Financial  Officer,  certifying to the  fulfillment  of the
conditions stated in Sections 8.1-8.4 hereof.

         8.6 Opinion of Counsel.  Sierra shall have delivered to Mercantile such
documents as may reasonably be requested by Mercantile to evidence compliance by
Sierra with the provisions of this Agreement and the Merger Agreement, including
an opinion of its counsel in a form substantially as set forth on Exhibit 8.6.

         8.7 Absence of Legal Impediment. On the Effective Date, the absence of:
(a) any suit, action or proceeding,  or order against  Mercantile or Sierra with
respect to any part of this Agreement, or the Merger, or challenging, enjoining,
or otherwise  affecting the  consummation of the Merger which, in the opinion of
counsel for  Mercantile,  materially  affects the Merger or the  consummation of
this  Agreement;  or (b) any pending or  threatened  action or proceeding by the
United States Department of Justice or other federal governmental agency seeking
to enjoin,  prohibit or otherwise impede the Merger; or (c) a banking moratorium
or other  suspension  of payment by banks in the  United  States or any  general
limitation on extension of credit by lending banks in the United States.

                                     Page 32

<PAGE>



         8.8 Effectiveness of Registration Statement. The Sierra common stock to
be issued to  Mercantile  shareholders  shall have been  determined to be exempt
from  registration  or the Sierra  Registration  Statement and any amendments or
supplements  thereto  shall have  become  effective  under the 1933 Act. No stop
order suspending the effectiveness of the Sierra Registration Statement shall be
in effect and no  proceedings  for such  purpose  shall have been  initiated  or
threatened  by or before the  Commission.  All state  securities  and "blue sky"
permits or approvals  required to consummate the  transactions  contemplated  by
this Agreement and the Merger Agreement shall have been received.

         8.9  Government  Approvals.  The Government  Approvals  shall have been
received and shall be in effect,  and all conditions or requirements  prescribed
by law or by any such approval shall have been satisfied; provided, however that
no Government Approval shall be deemed to have been received if it shall require
the  divestiture  or  cessation  of any of the present  business  or  operations
conducted by either of the parties hereto or shall impose any other condition or
requirement,  which  Mercantile  in its  reasonable  judgment  shall  deem to be
materially burdensome (in which case Mercantile shall promptly notify Sierra).

         8.10 Tax Opinion or Ruling.  Sierra and Mercantile  shall have received
the opinion  referred to in Section  7.10 hereof  which  opinion  shall meet the
requirements of such section.

         8.11 Uaudited Financials. Not later than the Determination Date, Sierra
shall have furnished  Mercantile a copy of its most recently prepared  unaudited
year-to-date  consolidated  financial statements,  including a balance sheet and
year-to-date statement of income of Sierra.

         8.12 Closing Documents.  Mercantile shall have received such certifi-
cates and other closing documents as counsel for Mercantile shall reasonably 
request.

         8.13 Fairness Opinion.  The Board of Directors of Mercantile shall have
received an opinion of its financial advisor to the effect that the terms of the
Merger  are  fair,  from a  financial  point  of  view,  to  Mercantile  and its
shareholders.

Section 9.  CLOSING

         9.1 Closing Date. The closing of the transactions  contemplated by this
Agreement  ("Closing") shall, unless another date, time or place is agreed to in
writing by Sierra and  Mercantile,  be held at the offices of McCutchen,  Doyle,
Brown & Enersen, San Francisco, California on the Effective Date.

         9.2 Delivery of Documents.  At the Closing, the opinions,  certificates
and  other  documents  required  to be  delivered  by this  Agreement  shall  be
delivered.

         9.3 Filings.  At the Closing,  Sierra and Mercantile shall instruct its
representatives  to make or confirm  such  filings as shall be  required  in the
opinion of counsel to Sierra and Mercantile to give effect to the Merger.

Section 10.  EXPENSES.

         10.1 Merger Related Expenses.  Each party hereto agrees to pay, without
right of reimbursement  from the other party and whether or not the transactions
contemplated by this Agreement or the Merger Agreement shall be consummated, the
costs  incurred by such party  incident to the  performance  of its  obligations
under this Agreement and the Merger  Agreement,  including  without  limitation,
costs incident to the preparation of the Merger Agreement,  this Agreement,  the
Sierra Registration Statement and the

                                     Page 33

<PAGE>



Proxy  Materials  (including  the audited  financial  statements  of the parties
contained  therein)  and incident to the  consummation  of the Merger and of the
other transactions  contemplated  herein and in the Merger Agreement,  including
the fees and  disbursements of counsel,  accountants,  consultants and financial
advisers employed by such party in connection therewith. Mercantile shall pay or
accrue up to  $10,000  toward  the  printing  costs of the  Sierra  Registration
Statement  and the  Proxy  Materials  and the  costs of  distributing  the Proxy
Materials and other information  relating to these  transactions to shareholders
of Mercantile.  All fees payable pursuant to state  "blue-sky"  securities laws,
fees  related to  obtaining a tax  opinion,  the fee  required to be paid to the
Commission to register the Sierra Shares shall be shared equally by the parties.
For purposes of determining  Adjusted Book Value,  all expenses of Mercantile in
connection with the Merger shall be treated as if they have been paid by accrued
on the books of Mercantile as of the Determination Date.

          10.2 Miscellaneous  Mercantile  Expenses.  For purposes of determining
Adjusted Book Value, as of the Adjustment  Date  Mercantile  shall accrue on its
books all expenses or contractual  obligations that are or will become due as of
the Effective Date that have been incurred by Mercantile or for which Mercantile
will be liable,  regardless  of  whether  Mercantile  has  received a billing or
invoice for such expenses or obligations.

Section 11.  AMENDMENT; TERMINATION

         11.1 Amendment.  This Agreement and the Merger Agreement may be amended
by Sierra and  Mercantile  at any time prior to the  Effective  Date without the
approval of the  shareholders  of Mercantile  with respect to any of their terms
except,  after  Mercantile  shareholders  have  approved  the Merger,  the terms
relating to the form or amount of  consideration  to be delivered to  Mercantile
shareholders in the Merger.

         11.2  Termination.  This Agreement and the Merger Agreement may be ter-
minated as follows:

         (a) By the mutual consent of the Boards of Directors of both Sierra and
Mercantile at any time prior to the consummation of the Merger.

         (b) By the Board of Directors  of Sierra on or after June 30, 1997,  if
(i) any of the  conditions in Section 7 to which the  obligations  of Sierra are
subject have not been fulfilled,  or (ii) such conditions have been fulfilled or
waived by Sierra and Mercantile shall have failed to complete the Merger.

         (c) By the Board of  Directors  of Sierra if (i) it has become aware of
any  facts or  circumstances  of which it was not aware on the date  hereof  and
which materially  adversely affect  Mercantile or its properties,  operations or
financial condition,  (ii) a materially adverse change shall have occurred since
September 30, 1996, in the business,  financial condition, results of operations
or  properties  of  Mercantile,  or (iii)  there has been  material  failure  or
prospective  material  failure  on the part of  Mercantile  to  comply  with its
obligations  under this  Agreement  or the  Merger  Agreement,  or any  material
failure or prospective failure to comply with any of the conditions set forth in
Section 7 hereof.

         (d) By the Board of  Directors  of Sierra in the event that  Mercantile
enters into a transaction or series of transactions with a third person or group
providing  for the  acquisition  of all or a  substantial  part  of  Mercantile,
whether by way of  merger,  exchange  or  purchase  of stock,  sale of assets or
otherwise.

         (e) By the Board of Directors of  Mercantile on or after June 30, 1997,
if (i) any of the conditions  contained in Section 8 to which the obligations of
Mercantile are subject have not been  fulfilled,  or (ii) such  conditions  have
been fulfilled or waived but Sierra shall have failed to complete the Merger;

                                     Page 34

<PAGE>



provided,  however,  that  if  Sierra  is  engaged  at the  time  in  litigation
(including an administrative  appeal procedure) relating to an attempt to obtain
one or more of the  Governmental  Approvals or if Sierra shall be  contesting in
good  faith  any  litigation   which  seeks  to  prevent   consummation  of  the
transactions  contemplated hereby, such nonfulfillment shall not give Mercantile
the right to terminate  this  Agreement  until the earlier of (A) June 30, 1997,
and (B) 60 days  after the  completion  of such  litigation  and of any  further
regulatory or judicial action pursuant thereto,  including any further action by
a governmental agency as a result of any judicial remand,  order or directive or
otherwise or any waiting  period with respect  thereto  provided such date shall
not occur beyond December 31, 1997.

         (f) By the Board of Directors of  Mercantile if (i) it has become aware
of any facts or  circumstances  of which it was not aware on the date hereof and
which can or do materially adversely affect Sierra or its properties, operations
or financial  condition,  (ii) a materially  adverse  change shall have occurred
since  September  30,  1996 in the  business,  financial  condition,  results of
operations  or assets of Sierra,  or (iii) there has been a material  failure or
prospective  material  failure  on  the  part  of  Sierra  to  comply  with  its
obligations  under this  Agreement  or the  Merger  Agreement,  or any  material
failure or prospective  material  failure to comply with any condition set forth
in Section 8.

         (g) By the Board of Directors of  Mercantile in the event Sierra or its
affiliates  enter into a Business  Combination  with any other entity which does
not expressly contemplate the performance by Sierra or its successor in interest
of Sierra's  obligations  under this Agreement and Sierra  indicates it will not
consummate this Agreement.

         11.3 Termination.  The power of termination  hereunder may be exercised
by Sierra or  Mercantile,  as the case may be,  only by giving  written  notice,
signed on behalf of such party by its Chief Executive  Officer or President,  to
the other party.

         11.4  Breach of  Obligations.  If there has been a  material  breach by
either party in the performance of any of the obligations herein which shall not
have been cured within ten business days after written  notice  thereof has been
given to the defaulting party, the  nondefaulting  party shall have the right to
terminate this  Agreement upon written notice to the other party.  In any event,
the  nondefaulting  party shall have no obligation to consummate any transaction
or take any further steps toward such consummation  contemplated hereunder until
such breach is cured.

         11.5  Termination and Expenses.

         (a) If  this  Agreement  is  terminated  for  any  reason,  the  Merger
Agreement shall automatically terminate. Termination of this Agreement shall not
terminate or affect the  obligations  of the parties to pay expenses as provided
in Section 10, to maintain the  confidentiality of the other party's information
pursuant  to  Section  3.1(f),  or the  provisions  of this  Section  11.5 or of
Sections 12.1-12.7.

         (b) If Sierra terminates this Agreement  pursuant to Section 11.2(d) or
because of a willful breach of the Agreement by Mercantile, Mercantile shall pay
to  Sierra,  on demand,  the sum of  $350,000.  If  Mercantile  terminates  this
Agreement  pursuant  to Section  11.2(g)  or because of a willful  breach of the
Agreement  by Sierra,  Sierra  shall pay to  Mercantile,  on demand,  the sum of
$350,000.  In each case, the amount  indicated shall be deemed  consideration or
liquidated  damages for expenses incurred and the lost opportunity cost for time
devoted to the transactions contemplated by this Agreement,  provided,  however,
each party shall remain liable for expenses as set forth in Section 10.

Section 12.  MISCELLANEOUS.

                                     Page 35

<PAGE>



         12.1 Notices.  Any notice or other communication  required or permitted
under this  Agreement  shall be effective only if it is in writing and delivered
personally,  or by  overnight  courier,  or by  facsimile or sent by first class
United States mail, postage prepaid,  registered or certified mail, addressed as
follows:


         To Sierra:                               To Mercantile:

         SierraWest Bancorp                       Mercantile
         10181 Truckee-Tahoe Airport Road         455 Capitol Mall
         Truckee, California 96160                Sacramento, California 95814
         Attention:  William T. Fike              Attention:  Michael Burkart
                     President & CEO                          President & CEO

         With a copy to:                          With a copy to:

         McCutchen, Doyle, Brown &                Lillick & Charles
         Enersen                                  Two Embarcadero Center
         Three Embarcadero Center                 San Francisco, CA 94111
         San Francisco, CA  94111                 Attention:  Ronald W. Bachli
         Attention:  James M. Rockett

or to such other  address as either party may  designate by notice to the other,
and shall be deemed to have been given upon receipt.

         12.2 Binding  Agreement.  This Agreement is binding upon and is for the
benefit of Sierra and Mercantile and its successors and permitted assigns.  This
Agreement  is not made for the  benefit  of any  person,  firm,  corporation  or
association  not a party  hereto,  and no other  person,  firm,  corporation  or
association  shall  acquire  or  have  any  right  under  or by  virtue  of this
Agreement. No party may assign this Agreement or any of its rights,  privileges,
duties or obligations  hereunder  without the prior written consent of the other
party to this Agreement.

         12.3 Survival of  Representations  and Warranties.  No investigation by
Sierra or  Mercantile  made  before or after  the date of this  Agreement  shall
affect the  representations and warranties which are contained in this Agreement
and such  representations  and  warranties  shall  survive  such  investigation,
provided that  representations,  warranties,  covenants and agreements of Sierra
and Mercantile contained in this Agreement shall not survive the Closing.

         12.4  Governing Law.  This Agreement shall be governed by and construed
in accordance with the laws of the State of California.

         12.5  Attorneys'  Fees.  In any  action  at law or  suit in  equity  in
relation to this Agreement, the prevailing party in such action or suit shall be
entitled  to  receive a  reasonable  sum for its  attorneys'  fees and all other
reasonable costs and expenses incurred in such action or suit.

         12.6 Entire Agreement;  Severability. This Agreement and the documents,
certificates,  agreements,  letters, schedules and exhibits attached or required
to  be  delivered   pursuant   hereto  set  forth  the  entire   agreement   and
understandings  of the  parties  in  respect  of the  transactions  contemplated
hereby,  and  supersede all prior  agreements,  arrangements  and  understanding
relating to the subject matter hereof. Each provision of this Agreement shall be
interpreted in a manner to be effective and

                                     Page 36

<PAGE>



valid under  applicable law, but if any provision  hereof shall be prohibited or
ruled invalid under applicable law, the validity, legality and enforceability of
the  remaining  provisions  shall not,  except as otherwise  required by law, be
affected or impaired as a result of such prohibition or ruling.

          12.7    Counterparts.    This    Agreement    may   be   executed   in
severalcounterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

         IN  WITNESS  WHEREOF,  Sierra  and  Mercantile  have each  caused  this
Agreement  and Plan of Merger to be signed  by its Chief  Executive  Officer  or
Chairman as of the day and year first above written.



MERCANTILE BANK                                   SIERRAWEST BANCORP



By /s/Michael Burkart                             By/s/ William T. Fike
     Michael Burkart                                   William T. Fike
     President and                                     President and
     Chief Executive Officer                           Chief Executive Officer



                                                   SIERRAWEST BANK



                                                   By/s/ William T. Fike
                                                        William T. Fike
                                                        President and 
                                                        Chief Executive Officer














                                     Page 37

<PAGE>




                                    EXHIBIT A
                                Merger Agreement

              This   merger   agreement   ("Merger   Agreement")   dated  as  of
         ___________, 1997 between SierraWest Bank, ("Subsidiary"), a California
         banking corporation,  and Mercantile Bank ("Mercantile"),  a California
         banking
         corporation is entered into as follows:

         Section 1.  Outstanding Shares.

              (a) Mercantile is a California banking  corporation  authorized by
         the  California  State  Banking  Department.  Mercantile  has 1,000,000
         authorized  shares of no par value  common  stock of which  336,980 are
         outstanding.  Mercantile has no outstanding  shares of preferred stock,
         options or warrants.

              (b) Subsidiary is a California banking  corporation  authorized by
         the California  State Banking  Department.  Subsidiary has ____________
         authorized shares of common stock of which __________ are outstanding..
         Subsidiary has no  outstanding  shares of preferred  stock,  options or
         warrants.

         Section 2.  The Merger.

              Mercantile shall be merged into Subsidiary ("Merger").

         Section 3.  Conversion of Shares.

              Upon  consummation of the Merger,  (i) each  outstanding  share of
         Mercantile,  other than shares held by  shareholders  who perfect their
         rights  as  dissenting  shareholders  under  California  law,  shall be
         converted  into the right to receive the exchange  amount of $_____ per
         share ("Per Share  Exchange  Amount")  comprised of a Cash Component of
         50% and a Stock  Component  consisting  of common  stock of  SierraWest
         Bancorp  valued at 50%, in  accordance  with an election  described  in
         Section __ below;  and (ii) the outstanding  shares of Subsidiary shall
         remain the outstanding shares of the Surviving  Corporation and are not
         affected by the Merger; and there will be no other outstanding  shares,
         options,  warrants  or other  stock  rights to  acquire  any  shares of
         Mercantile.

         Section 4.  Terms of Cash/Stock Election.

              The Exchange  Amount will be allocated to the Stock  Component and
         the Cash Component in accordance the following  election and procedures
         (the "Cash/Stock Election").

         Mercantile  shareholders  may elect to receive the  Exchange  Amount in
         either all  SierraWest  Bancorp  shares or all cash.  If no election is
         made,  the  shareholder  will  receive cash equal to 50% and stock of a
         value equal to 50%.


                                     Page 38

<PAGE>



         If the aggregate Cash Component is  undersubscribed,  the  unsubscribed
         portion of this minimum  aggregate Cash Component will be allocated pro
         rata (by number of shares) among all  Mercantile  shareholders;  if the
         aggregate Cash Component is oversubscribed,  the Cash Component of each
         Mercantile  shareholder  electing  to receive  cash will be reduced pro
         rata (by number of shares  electing to receive cash).  The total of the
         Cash  Component and the Stock  Component will always equal the Exchange
         Amount.

         Mercantile   shareholders  who  make  a  Cash/Stock  Election  have  no
         assurance  that they will in fact  receive all cash or all stock.  They
         will  receive  cash in excess of the above amount per share only to the
         extent excess cash is available  under the  limitation set forth above,
         and they will receive all stock only if other  Mercantile  shareholders
         elect at least an aggregate of 50% in cash.

         Section 5.  Articles of Incorporation and By-Laws.

              (a) The Articles of  Incorporation of Subsidiary  shall,  upon the
         Effective  Date,  be the  Articles of  Incorporation  of the  Surviving
         Corporation. It is the intention of the parties that the Merger will be
         treated as a tax free  reorganization  pursuant  to Section  368 of the
         Internal Revenue Code.

              (b) The  By-Laws of  Subsidiary,  as they  exist on the  Effective
         Date, shall be the By-Laws of the Surviving  Corporation until the same
         are amended.

         Section 6.  Exchange of Shares.

              The conversion of shares as provided in the Merger Agreement shall
         occur  automatically  upon the  Effective  Date  without  action by the
         holders thereof. Each holder of Mercantile Shares shall on or after the
         Effective  Date  surrender  each  certificate  representing  Mercantile
         Shares to the  Exchange  Agent  appointed  by the  parties and shall be
         entitled to receive in exchange therefor the Per Share Exchange Amount.

         Section 7.  Effect of Merger And Effective Date.

              The effect of the Merger and the Effective  Date of the Merger are
         as prescribed by law.

         Section 8.  Officers and Directors

              The officers and  directors of  Subsidiary  holding  office on the
         Effective  Date shall be the  officers and  directors of the  Surviving
         Corporation  until  removed as provided by law or until the election of
         their respective successors.

         Section 9.  Acts of Merging Corporation

              Mercantile,  as the merging corporation,  shall from time to time,
         as and when requested by the Surviving Corporation, execute and deliver
         all such documents and instruments  and take all such action  necessary
         or desirable to

                                     Page 39

<PAGE>



         evidence or carry out this Merger.

         All capitalized term herein shall have the meanings ascribed to them in
         this Merger Agreement;  provided,  however, if no meaning is separately
         ascribed to such capitalized terms in this Merger Agreement,  then such
         terms will have the meanings ascribed to them in the Agreement and Plan
         of Acquisition and Merger dated __________, 1997.

         In witness whereof the parties have executed this Merger Agreement.


              Mercantile Bank


              By_____________________________________
                  Michael Burkart
                  President


              By_____________________________________
                  Secretary




              SierraWest Bank




              By______________________________________
                  William T. Fike
                  President



              By______________________________________
                  Secretary



                                     Page 40

<PAGE>

                                   Exhibit 7.6

_______________, 1997

SierraWest Bancorp
P.O. Box 61000
Truckee, CA 96161


                       SierraWest Bancorp- Mercantile Bank

Ladies and Gentlemen:

We have  acted as counsel  for  Mercantile  Bank  ("Mercantile"),  a  California
banking corporation, with respect to the merger (the "Merger") of Mercantile and
SierraWest  Bank,  a  California  banking  corporation,  pursuant to the Plan of
Acquisition  and Merger dated as of January __, 1997 (the  "Agreement")  between
Mercantile,  SierraWest Bancorp and SierraWest Bank (collectively  "Sierra"),  a
California  corporation,  and Exhibit A thereto (the "Merger  Agreement").  This
opinion is rendered to you  pursuant  to Section  7.6 of the  Agreement.  Unless
otherwise  defined herein,  all capitalized terms in this opinion shall have the
meanings assigned to them in the Agreement.

In rendering  the opinions  hereinafter  expressed,  we have examined and relied
upon such documents and instruments as we have deemed appropriate, including the
following:

     A.  The Agreement and the exhibits thereto;

     B.  Resolutions of the board of directors of Mercantile with respect to the
 Merger;

     C.  Articles of Incorporation of Mercantile certified by the California 
Secretary of State as of a recent date;

     D.  Bylaws, minute book and stock ledger of Mercantile;

     E.  Certificate of Status from the California Secretary of State indicating
that Mercantile is in good standing in California as of a recent date (the 
"Status Certificate");

     F.  Registration Statement on Form S-4 of Sierra and the related Proxy 
Statement of Mercantile with respect to the Merger (the "Proxy Materials");

     G.  Proceedings of the meeting of shareholders of Mercantile held on 
_____________; and,

     H.  An officers' certificate of Mercantile as to certain factual matters.

We have obtained, and have assumed and relied upon the accuracy, genuineness and
completeness  of, such  certificates  and assurances from public officials as we
have deemed necessary or appropriate to enable us to render our opinion.

In conducting our examination, we have assumed, without investigation, the 
genuineness of all

                                     Page 41

<PAGE>



signatures  (other than that of  Mercantile),  the  correctness of all documents
submitted  to us as  originals,  the  conformity  to original  documents  of all
documents   submitted  to  us  as  certified  or  photostatic   copies  and  the
authenticity   of  the   originals   of  such   copies;   the  accuracy  of  the
representations  as to  factual  matters  made by Sierra and  Mercantile  in the
Agreement;  the accuracy of representations and statements as to factual matters
made by officers and  employees of  Mercantile;  that the Agreement is the valid
and binding obligation of Mercantile; that Mercantile will enforce the Agreement
in a commercially  reasonable  manner; and that the Agreeent contains the entire
agreement of the parties.

Our opinion in paragraph 3 below is subject to :

(i)  the  effect  of  bankruptcy,   insolvency,   reorganization,   arrangement,
moratorium,  and other  similar laws now or  hereafter in effect  relating to or
affecting the rights of creditors generally;

(ii) limitations imposed by California law, federal law, or equitable principles
upon any of the remedies,  covenants,  or other  provisions of the Agreement and
upon  the  availability  of  injunctive  relief  or  other  equitable  remedies,
including,  without  limitation,  the effect of  California  and  federal  court
decisions,  invoking  statutes  or  principles  of equity,  which have held that
certain covenants and provisions of agreements are unenforceable  where: (A) the
breach of such covenants or provisions imposes  restrictions or burdens upon one
party, and it cannot be demonstrated  that the enforcement of such  restrictions
or burdens is reasonably necessary for the protection of the other party, or (B)
a party's  enforcement of such covenants or provisions  under the  circumstances
would violate such party's implied covenants of good faith and fair dealing, and

(iii) the power of federal and state courts to refuse to enforce (or to stay the
enforcement  of) any  provision  of the  Agreement  which  purports to waive the
rights of Mercantile to assert the claims or defenses available to Mercantile by
statute, common law, or equity.

Whenever a statement herein with respect to the existence or absence of facts is
qualified  by the  phrases  "we are not  aware"  or "to  our  knowledge,"  it is
intended  to  indicate  that,  during  the  course  of  our   representation  of
Mercantile,  no information  that would give us current actual  knowledge of the
inaccuracy of such  statement  has come to the  attention of those  attorneys in
this firm who have rendered legal services in connection with the representation
described  in the  introductory  paragraph  of  this  opinion  letter  and  such
statement is based solely upon (i) an inquiry of attorneys  within this firm who
have  rendered  such  services;  (ii)  receipt of a  certificate  executed by an
officer of Mercantile covering such matters; and (iii) opinions of other counsel
engaged by Mercantile  regarding any litigation matters with respect to which we
do not represent  Mercantile.  However,  we have not undertaken any  independent
investigation  to  determine  the  accuracy of such  statement,  and any limited
inquiry  undertaken by us during the  preparation  of this opinion letter should
not be regarded as such an  investigation;  no inference as to our  knowledge of
any matters  bearing on the accuracy of any such statement  should be drawn from
the fact of our representation of Mercantile.

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

     1.  Mercantile  is a  California  banking  corporation  duly  incorporated,
validly  existing and in good standing under the laws of the State of California
and has the  corporate  power to own all of its property and assets and to carry
on its business as it is now being  conducted.  Mercantile is duly licensed as a
commercial bank by the California State Banking Department, and its deposits are
insured  by  the  Federal  Deposit  Insurance  Corporation  in  accordance  with
applicable laws and regulations.

                                     Page 42

<PAGE>




     2. Mercantile has the corporate power and corporate authority to enter into
and perform its obligations  under the Agreement and the Merger  Agreement.  The
execution and delivery by  Mercantile of the Agreement and the Merger  Agreement
did not, and the consummation by Mercantile of the transactions  contemplated by
the  Agreement  and the Merger  Agreement  will not,  violate any  provision  of
Mercantile's  articles of incorporation  or bylaws,  any provision of federal or
California  law  applicable  to  Mercantile,   or  any  governmental  regulation
applicable to Mercantile,  or constitute a material  default under, or result in
the breach or  acceleration  of any  obligation  or the creation of any material
lien under any material  agreement to which  Mercantile is bound and of which we
have knowledge  (except that we express no opinion relating to the effect of the
Agreement  under any financial test or ratio  contained in any mortgage,  lease,
agreement,  instrument,  judgment,  decree,  order,  arbitration award, writ, or
injunction applicable to Mercantile).

     3. The  Agreement  and the  Merger  Agreement  have been  duly  authorized,
executed and  delivered by  Mercantile,  and each of them is a valid and binding
agreement of Mercantile.

     4. All California state and federal regulatory  approvals that are required
to be obtained by Mercantile in connection with the Merger have been obtained.

     5. To our  knowledge,  Mercantile is not a party to, and is not  threatened
with, any legal action or other  proceeding or  investigation  before any court,
any arbitrator of any kind or any government agency that challenges or questions
the  authority or ability of  Mercantile  to perform its  obligations  under the
Agreement  or the  Merger  Agreement  or to carry out the  Merger,  or where the
amount in  controversy  exceeds  $50,000  and which  has not been  disclosed  by
Mercantile to Sierra.

     6. The authorized capital stock of Mercantile  consists of 1,000,000 shares
of no par value common  stock.  To our knowledge and before giving effect to the
issuance of shares in connection with the Merger:

         (a) 336,980 shares of common stock are duly authorized,  validly issued
and outstanding, fully paid and, except as provided in California Financial Code
ss.662, nonassessable;

         (b)  there  are  no  outstanding  (i)  options,  agreements,  calls  or
commitments  of any character  that would  obligate  Mercantile to issue,  sell,
pledge,  assign or otherwise  encumber or dispose of, or to purchase,  redeem or
otherwise  acquire,  any Mercantile common stock or any other equity security of
Mercantile,  or (ii) warrants or options  relating to, rights to acquire or debt
or equity securities  convertible into, shares of Mercantile common stock or any
other equity security of Mercantile; and.


         (c) the outstanding  common stock of Mercantile has not been registered
with the  Securities  and Exchange  Commission  or the FDIC pursuant to the 1934
Act.

In connection with the preparation of the Registration Statement,  including the
related Proxy  Materials,  we have  performed  legal services for Mercantile and
participated in conferences with directors, officers and employees of Mercantile
and  representatives  of the independent  accountants  for  Mercantile.  At such
conferences,  the  contents of the Proxy  Materials  related to  Mercantile  and
related matters were discussed and, although we are not passing upon, and do not
assume any  responsibility  for, the accuracy,  completeness  or fairness of the
statements  related to Mercantile and contained in the Proxy  Materials,  on the
basis of the  foregoing,  we are not aware of any facts  that  would  lead us to
believe that the Proxy Materials as of the date thereof  contained any statement
in

                                     Page 43

<PAGE>



respect to Mercantile which, at the time and in light of the circumstances under
which it was made, was false or misleading  with respect to any material fact or
omitted to state any material  fact  necessary  in order to make the  statements
therein not false or misleading.  In making the foregoing statement,  we express
no belief with  respect to the  financial  statements  and other  financial  and
statistical  data included in the Proxy  Materials or with respect to statements
in, or  omissions  from,  the  Proxy  Materials  made in  reliance  upon,  or in
conformity with,  information furnished by Mercantile for use in connection with
the Proxy Materials.

We are members of the bar of the State of  California.  Our  opinions  below are
limited  to the effect of (i) the laws of the State of  California  and (ii) the
federal laws of the United States of America; we express no opinion with respect
to the laws of any other jurisdiction.

This opinion is rendered solely for the benefit of Sierra in connection with the
Merger and may not be relied upon by any other  party or for any other  purpose.
Neither the  original  nor any copies of this  opinion may be  furnished  to any
other person without our prior written consent.

Very truly yours,

Lillick & Charles, LLP



                                     Page 44

<PAGE>




                                  EXHIBIT 7.12

                              Rule 145 Undertaking

January __, 1997

SierraWest Bancorp
10181 Truckee-Tahoe Airport Road
P.O. Box 61000
Truckee, CA  96160

Ladies and Gentlemen:

The undersigned is a director of Mercantile Bank  ("Mercantile") and an owner of
common stock of Mercantile ("Mercantile Common Stock").

Mercantile  and  SierraWest  Bancorp  ("Sierra")  have  entered  into a Plan  of
Acquisition and Merger ("Agreement") dated today's date related to the Merger of
Mercantile   into   Sierra.   In   consideration   of  the   premises   and  the
representations, warranties, agreements and conditions in this letter and in the
Agreement  and  in  order  to  induce  Sierra  to  execute  the  Agreement,  the
undersigned agrees and undertakes, as follows:

The  undersigned  is currently  determined to be an affiliate of Mercantile  for
purposes of Rule 145 promulgated by the Securities and Exchange Commission.  The
following  undertaking is given pursuant to and in compliance  with Section 7.12
of the Agreement.  The Merger will result in the issuance of new common stock of
Sierra.

The  undersigned  understand  that  Sierra  and  Mercantile  are  relying on the
performance of the covenants contained herein to insure that any sales of shares
owned by the  undersigned  are not deemed to be acting as an  underwriter  in an
unregistered public offering in violation of federal securities laws.

The  undersigned  hereby further agrees not to sell,  transfer or dispose of any
shares of Sierra acquired in the Merger,  or to attempt to do so, whether or not
deemed to be an affiliate of Sierra,  unless such sale,  transfer or disposition
is made:

     (i) pursuant to a then-current, effective registration statement under the 
Securities Act of 1933, or

     (ii)in a transaction which, in the opinion of counsel satisfactory to the 
issuer, is not required to be registered under the Securities Act of 1933; or

     (iii)    in a transaction permitted by the Securities and Exchange Commis-
sion's Rule 145.

The undersigned  acknowledges  that the above  agreements are supported by valid
consideration.


                                     Page 45

<PAGE>



IN WITNESS  WHEREOF,  the undersigned has executed this Agreement as of the date
first above written.

                               Very truly yours,


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


                                     Page 46

<PAGE>



                                  EXHIBIT 7.15

                              Shareholder Agreement



                                January __, 1997



SierraWest Bancorp
10181 Truckee-Tahoe Airport Road
P.O. Box 61000
Truckee, CA  96160

Ladies and Gentlemen:

The undersigned is a director of Mercantile Bank  ("Mercantile") and an owner of
common stock of Mercantile ("Mercantile Common Stock").

Mercantile  and  SierraWest  Bancorp  ("Sierra")  have  entered  into a Plan  of
Acquisition and Merger ("Agreement") dated today's date related to the Merger of
Mercantile into Sierra.  This  Shareholder  Agreement is delivered in accordance
with Section 7.15 of the  Agreement.  In  consideration  of the premises and the
representations, warranties, agreements and conditions in this letter and in the
Agreement  and  in  order  to  induce  Sierra  to  execute  the  Agreement,  the
undersigned agrees and undertakes, as follows:

The undersigned will vote, in person or by proxy, at any meeting of shareholders
of Mercantile (or any action by written consent in lieu of a meeting) to approve
the  Agreement and the  transactions  contemplated  thereby (the  "Shareholders'
Meeting"), all of the shares of Mercantile stock as to which the undersigned has
sole or shared voting power (the "Shares") as of the record date  established to
determine shareholders who have the right to vote at the Shareholders' Meeting.

The undersigned  agrees that, from and after the date of this letter and through
the date of the  Shareholders'  Meeting (and any  postponements  or adjournments
thereof), the shareholder will not sell, assign,  transfer or otherwise take any
action that will alter or affect in any way the right to vote the Shares, except
(i) with the prior written consent of Sierra (ii) to change such right from that
of a shared right of the  shareholder  to vote the Shares to a sole right of the
shareholder to vote the Shares.

The undersigned  represents and warrants that the undersigned has sole or shared
voting power over  ___________  Shares covered by the terms of this letter;  and
there are no proxies,  voting trusts or other  agreements or  understandings  to
which the undersigned or the  undersigned's  spouse, if any, is a party or bound
or that  requires  that any of the Shares be voted in any specific  manner other
than as provided in this letter.


                                     Page 47

<PAGE>



This letter shall terminate  automatically without further action at the earlier
of the Effective Date under the Agreement or the termination of the Agreement in
accordance with its terms.

This Agreement may be executed in one or more counterparts,  each of which shall
be  deemed  to be an  original  instruments,  but all of  which  together  shall
constitute one and the same instrument.

IN WITNESS  WHEREOF,  the undersigned has executed this Agreement as of the date
first above written.

                                            Very truly yours,


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




                                 SPOUSAL CONSENT


         I, ____________________, hereby confirm that I have read and understand
this letter and agree that it shall bind my interest in the Shares, if any.


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



Accepted and agreed to as of the date first above written:

SIERRAWEST BANCORP



By____________________________




                                     Page 48

<PAGE>




                                   Exhibit 8.6



_____________, 1997



Mercantile Bank
455 Capitol Mall
Sacramento, CA 95814


                      SierraWest Bancorp - Mercantile Bank


Ladies and Gentlemen:

We have  acted as  counsel  for  SierraWest  Bancorp  ("Sierra"),  a  California
corporation,   and  SierraWest  Bank  ("Sierra  Bank"),  a  California   banking
corporation  with  respect to the  acquisition  and  merger  (the  "Merger")  of
Mercantile Bank ("Mercantile"),  a California banking corporation, with and into
Sierra Bank,  pursuant to the Plan of Acquisition and Merger dated as of January
__, 1997 (the "Agreement") and Exhibit A thereto (the "Merger Agreement").  This
opinion is rendered to you  pursuant  to Section  8.6 of the  Agreement.  Unless
otherwise  defined herein,  all capitalized terms in this opinion shall have the
meaning assigned to them in the Agreement.

In rendering  the opinions  hereinafter  expressed,  we have examined and relied
upon such documents and instruments as we have deemed appropriate, including the
following:

         A.     The Agreement and the exhibits thereto;

         B.     Resolutions of the board of directors of Sierra and Sierra Bank
with respect to the Merger;

         C.     Articles of Incorporation of Sierra certified by the California 
Secretary of State as of a recent date;

         D.     Articles of Incorporation of Sierra Bank certified by the Cali-
fornia Secretary of State as of a recent date;

         E.     Bylaws, minute book and stock ledger of Sierra;

         F.     Bylaws and minute book of Sierra Bank;


                                     Page 49

<PAGE>



         G.     Certificates of Status from the California Secretary of State in
dicating that Sierra and Sierra Bank are in good standing in California as of a 
recent date (the "Status Certificate");

         H.     Registration Statement on Form S-4 of Sierra and the related 
Proxy Statement of Mercantile with repect to the Merger (the "Proxy Materials");
and

         I.     Officers' certificates of Sierra and Sierra Bank as to certain 
factual matters.

We have obtained, and have assumed and relied upon the accuracy, genuineness and
completeness  of, such  certificates  and assurances from public officials as we
have deemed necessary or appropriate to enable us to render our opinion.

In conducting  our  examination,  we have assumed,  without  investigation,  the
genuineness of all signatures  (other than that of Sierra and Sierra Bank to the
Agreement  and  to the  Merger  Agreement),  the  correctness  of all  documents
submitted  to us as  originals,  the  conformity  to original  documents  of all
documents   submitted  to  us  as  certified  or  photostatic   copies  and  the
authenticity   of  the   originals   of  such   copies;   the  accuracy  of  the
representations as to factual matters made by Sierra, Sierra Bank and Mercantile
in the Agreement;  the accuracy of representations  and statements as to factual
matters  made by officers  and  employees  of Sierra and Sierra  Bank;  that the
Agreement is the valid and binding  obligation of  Mercantile;  that  Mercantile
will enforce the Agreement in a  commercially  reasonable  manner;  and that the
Agreement contains the entire agreement of the parties.

Our opinions in  paragraphs 4 and 5 below are subject to :

                  (i) the  effect  of  bankruptcy,  insolvency,  reorganization,
arrangement,  moratorium,  and other  similar  laws now or  hereafter  in effect
relating to or affecting the rights of creditors generally;

                  (ii)  limitations  imposed by California law,  federal law, or
equitable principles upon any of the remedies, covenants, or other provisions of
the Agreement and upon the availability of injunctive  relief or other equitable
remedies,  including,  without limitation,  the effect of California and federal
court decisions, invoking statutes or principles of equity, which have held that
certain covenants and provisions of agreements are unenforceable  where: (A) the
breach of such covenants or provisions imposes  restrictions or burdens upon one
party, and it cannot be demonstrated  that the enforcement of such  restrictions
or burdens is reasonably necessary for the protection of the other party, or (B)
a party's  enforcement of such covenants or provisions  under the  circumstances
would violate such party's implied covenants of good faith and fair dealing, and

         (iii) the power of federal and state courts to refuse to enforce (or to
stay the  enforcement of) any provision of the Agreement which purports to waive
the rights of Sierra and Sierra Bank to assert the claims or defenses  available
to Sierra and Sierra Bank by statute, common law, or equity.

Whenever a statement herein with respect to the existence or

                                     Page 50

<PAGE>



absence  of facts is  qualified  by the  phrases  "we are not  aware" or "to our
knowledge,"  it  is  intended  to  indicate  that,  during  the  course  of  our
representation  of Sierra and Sierra  Bank,  no  information  that would give us
current  actual  knowledge of the  inaccuracy of such  statement has come to the
attention of those  attorneys in this firm who have rendered  legal  services in
connection with the  representation  described in the introductory  paragraph of
this  opinion  letter and such  statement is based solely upon (i) an inquiry of
attorneys within this firm who have rendered such services;  (ii) receipt of one
or more certificates executed by officers of Sierra or Sierra Bank covering such
matters;  and (iii)  opinions of other counsel  engaged by Sierra or Sierra Bank
regarding  any  litigation  matters  with  respect to which we do not  represent
Sierra  or  Sierra  Bank.  However,  we  have  not  undertaken  any  independent
investigation  to  determine  the  accuracy of such  statement,  and any limited
inquiry  undertaken by us during the  preparation  of this opinion letter should
not be regarded as such an  investigation;  no inference as to our  knowledge of
any matters  bearing on the accuracy of any such statement  should be drawn from
the fact of our representation of Sierra or Sierra Bank.

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

         1. Sierra is a corporation duly  incorporated,  validly existing and in
good standing  under the laws of the State of  California  and has the corporate
power to own all of its  property  and assets and to carry on its business as it
is now being  conducted.  Sierra is a registered  bank holding company under the
Bank Holding Company Act of 1956.

         2. Sierra Bank is a California  banking  corporation duly incorporated,
validly  existing and in good standing under the laws of the State of California
and has the  corporate  power to own all of its property and assets and to carry
on its business as it is now being conducted.  Sierra Bank is duly licensed as a
commercial bank by the California State Banking Department, and its deposits are
insured  by  the  Federal  Deposit  Insurance  Corporaiton  in  accordance  with
applicable laws and regulations.

         3.  Sierra  and  Sierra  Bank have the  corporate  power and  corporate
authority  to enter into and  perform  their  respective  obligations  under the
Agreement  and the Merger  Agreement.  The  execution and delivery by Sierra and
Sierra Bank of the  Agreement  and the  execution and delivery by Sierra Bank of
the Merger  Agreement did not, and the consummation by Sierra and Sierra Bank of
the  transactions  contemplated  by the Agreement and the Merger  Agreement will
not,   violate  any  provision  of  Sierra's  or  Sierra   Bank's   articles  of
incorporation  or bylaws,  any  provision of federal or  California  law, or any
governmental  regulation  applicable  to Sierra or Sierra Bank,  or constitute a
material  default  under,  or  result  in  the  breach  or  acceleration  of any
obligation or the creation of any material lien under any material  agreement to
which  either  Sierra  or Sierra  Bank is bound  and of which we have  knowledge
(except that we express no opinion relating to the effect of the Agreement under
any  financial  test or  ratio  contained  in any  mortgage,  lease,  agreement,
instrument,

                                     Page 51

<PAGE>



judgment,  decree,  order,  arbitration award, writ, or injunction applicable to
Sierra or Sierra Bank).

         4. The  Agreement has been duly  authorized,  executed and delivered by
Sierra and  Sierra  Bank,  and is a valid and  binding  agreement  of Sierra and
Sierra Bank.

         5.       The Merger Agreement has been duly authorized, executed and 
delivered by Sierra Bank, and is a valid and binding agreement of Sierra Bank.

         6. All  California  state and  federal  regulatory  approvals  that are
required to be obtained by Sierra and Sierra Bank in connection  with the Merger
have been obtained.

         7. To our knowledge,  neither Sierra nor Sierra Bank is a party to, nor
threatened with, any legal action or other  proceeding or  investigation  before
any court,  any arbitrator of any kind or any government  agency that challenges
or  questions  the  authority or ability of Sierra or Sierra Bank to perform its
obligations  under the  Agreement  or the Merger  Agreement  or to carry out the
Merger,  or where the amount in controversy  exceeds  $200,000 and which has not
been disclosed by Sierra to Mercantile.

         8. As of  ___________,  1997,  the  authorized  capital stock of Sierra
consists of 9,800,000  shares of  preferred  stock,  200,000  shares of series A
preferred  stock and  10,000,000  shares of common  stock.  To our knowledge and
before giving effect to the issuance of shares in connection with the Merger:

         (a)  2,754,569 shares of Sierra common stock are duly authorized, 
validly issued and outstanding, fully paid and nonassessable;

         (b) there are currently  outstanding options to purchase 384,080 shares
of common stock issued pursuant to the 1996 Stock Option Plan;

         (c)   there are $8,705,000 of Sierra deventures convertible into 
870,500 shares of Sierra common stock;

         (d) said  outstanding  stock,  options and  debentures  were all issued
pursuant to and in conformance  with one or more  exemptions  from  registration
under the Securities  Act of 1933, as amended,  or were  registered  pursuant to
said Act;

         (e) other than the options and debentures  identified above,  there are
no outstanding  (i) options,  agreements,  calls or commitments of any character
that would obligate Sierra to issue, sell, pledge,  assign or otherwise encumber
or dispose of, or to purchase,  redeem or otherwise  acquire,  any Sierra common
stock or any other  equity  security  of  Sierra,  or (ii)  warrants  or options
relating to, rights to acquire or debt or equity  securities  convertible  into,
shares of Sierra common stock or any other equity security of Sierra; and.

                                     Page 52

<PAGE>




         (f) the outstanding common stock of Sierra has been registered with the
Securities and Exchange Commission pursuant to the 1934 Act.

         9.       All oustanding capital stock of Sierra Bank is held by Sierra.

         10. The issuance of the Shares to be issued  pursuant to the Merger has
been duly registered under the Securities Act of 1933. Such Shares,  when issued
in accordance with the terms of the Agreement, will be duly authorized,  validly
issued, fully paid and nonassessable.

In  connection  with  the  preparation  of the  Registration  Statement  we have
performed  legal  services  for  Sierra and  participated  in  conferences  with
directors,   officers  and  employees  of  Sierra  and  representatives  of  the
independent  accountants for Sierra.  At such  conferences,  the contents of the
Proxy  Materials and related  matters were  discussed  and,  although we are not
passing  upon,  and  do  not  assume  any  responsibility   for,  the  accuracy,
completeness or fairness of the statements contained in the Proxy Materials,  on
the basis of the foregoing,  we are not aware of any facts that would lead us to
believe that the Proxy Materials as of the date thereof  contained any statement
in respect to Sierra which, at the time and in light of the circumstances  under
which it was made, was false or misleading  with respect to any material fact or
omitted to state any material  fact  necessary  in order to make the  statements
therein not false or misleading.  In making the foregoing statement,  we express
no belief with  respect to the  financial  statements  and other  financial  and
statistical  data included in the Proxy  Materials or with respect to statements
in, or  omissions  from,  the  Proxy  Materials  made in  reliance  upon,  or in
conformity with,  information furnished by Mercantile for use in connection with
the Proxy Materials.

We are members of the bar of the State of  California.  Our  opinions  below are
limited  to the effect of (i) the laws of the State of  California  and (ii) the
federal laws of the United States of America; we express no opinion with respect
to the laws of any other jurisdiction.

                                     Page 53

<PAGE>




This opinion is rendered solely for the benefit of Mercantile in connection with
the  Merger  and may not be  relied  upon by any  other  party or for any  other
purpose. Neither the original nor any copies of this opinion may be furnished to
any other person without our prior written consent.

Very truly yours,

McCutchen, Doyle, Brown & Enersen, LLP

By_________________________________
     A member of the firm

                                     Page 54

<PAGE>
         

                                   EXHIBIT 99

News Release

FOR:                     SIERRAWEST BANCORP AND MERCANTILE BANK

APPROVED BY:  William T. Fike               Michael Burkart
              SierraWest Bank               Mercantile Bank
              President &                   President &
              Chief Executive Officer       Chief Executive Officer
              (916) 582-3000                (916) 442-6000

CONTACT:      Morgen-Walke Associates, Inc.
              Doug Sherk, David Gennarelli
              (415) 296-7383
              Emily Dupree, Joshua Passman
              (212) 850-5600
              Mercantile Bank                For Immediate Release
              Michael Burkart
              (916) 442-6000

                     SIERRAWEST BANCORP AND MERCANTILE BANK
                            SIGN DEFINITIVE AGREEMENT

TRUCKEE,  Calif.  (January  24,  1997)  --  SierraWest  Bancorp  (Nasdaq:  SWBS)
announced today that it has signed a definitive  agreement to acquire Mercantile
Bank. Based in Sacramento,  California,  Mercantile is a business bank primarily
servicing the  commercial  and real estate loan industry and has total assets of
$45 million.  Mercantile will be merged into SierraWest  Bancorp's  wholly-owned
subsidiary  SierraWest  Bank.  The  acquisition,  which is scheduled to close in
June, 1997, is subject to the approval of Mercantile's  shareholders and federal
and state  regulators.  It is expected to have a positive effect on SierraWest's
1997 earnings.
         Under the terms of the proposed transaction, shareholders of Mercantile
will receive total compensation of $6.6 million,  subject to certain adjustments
primarily based upon the level of deposits and capital.  The  compensation  will
consist of 50% cash and 50% stock.
         "Our  proposed  acquisition  of  Mercantile  Bank allows  SierraWest to
expand its presence in the strategically  important  Sacramento  market," stated
William T. Fike,  president and chief executive  officer.  "The combination will
increase  SierraWest's  total  assets  to over $500  million  and  increase  the
Company's deposit base in Sacramento to over $85 million."
         Robert F. Gaines,  chairman of Mercantile Bank, commented,  "Mercantile
is pleased at the  opportunity  to join with  SierraWest and we believe that the
combination  will add  significantly  to the  range  of  services  available  to
Mercantile customers."
         SierraWest   Bancorp  is  the  holding  company  for  SierraWest  Bank,
headquartered  in Truckee,  California  with branches in Sacramento,  the Sierra
foothills region of California and northern Nevada.

                                     # # #

                                    Page 55


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