ACQUISITION AGREEMENT
                                       AND
                                 PLAN OF MERGER



                                      among

               PLATTE VALLEY FINANCIAL SERVICE COMPANIES, INC.,

                          PLATTE VALLEY NATIONAL BANK,

                     PLATTE VALLEY ACQUISITION COMPANY, INC.
                               (In Organization),

                           TRI-COUNTY BANCORP, INC.

                                       and

                                 TRI-COUNTY BANK









                             As of January 24, 2001





                                TABLE OF CONTENTS
                                                                            Page
ARTICLE 1 - PRINCIPAL TERMS OF THE MERGER....................................2
- -----------------------------------------
      1.1   The Plan of Merger...............................................2
      ---   ------------------
      1.2   Closing Date.....................................................3
      ---   ------------
      1.3   The Surviving Corporation........................................3
      ---   -------------------------
ARTICLE 2 - DISTRIBUTIONS TO TRI-COUNTY SHAREHOLDERS.........................3
- ----------------------------------------------------
      2.1   Delivery of Consideration........................................3
      ---   -------------------------
      2.2   Dissenting Shareholders..........................................4
      ---   -----------------------
      2.3   Special Dividend.................................................4
      ---   ----------------
      2.4   Stock Options....................................................5
      ---   -------------
      2.5   Benefit Plans....................................................5
      ---   -------------
ARTICLE 3 - CONDITIONS.......................................................6
- ----------------------
      3.1   Mutual Conditions................................................6
      ---   -----------------
            a.    No Litigation..............................................6
            --    -------------
            b.    Shareholder Approval.......................................6
            --    --------------------
            c.    Third-Party Approvals......................................6
            --    ---------------------
      3.2   Conditions in Favor of Tri-County................................7
      ---   ---------------------------------
            a.    Representations, Warranties and Agreements.................7
            --    ------------------------------------------
            b.    Officer's Certificate......................................7
            --    ---------------------
            c.    Secretary's Certificate....................................7
            --    -----------------------
            d.    Legal Opinion..............................................7
            --    -------------
            e.    Authorization of Merger....................................7
            --    -----------------------
            f.    Proper Actions and Documentation...........................7
            --    --------------------------------
            g.    Fairness Opinion...........................................7
            --    ----------------
      3.3   Conditions in Favor of Platte Valley and AcqCo...................8
      ---   ----------------------------------------------
            a.    Material Adverse Change....................................8
            --    -----------------------
            b.    Representations, Warranties and Agreements.................8
            --    ------------------------------------------
            c.    Officers' Certificate......................................8
            --    ---------------------
            d.    Secretary's Certificate....................................8
            --    -----------------------
            e.    Legal Opinion..............................................8
            --    -------------
            f.    Non-Competition/Advisory Board Agreements..................9
            --    -----------------------------------------
            g.    Resignations of Officers and Directors.....................9
            --    --------------------------------------
            h.    Dissenters' Rights.........................................9
            --    ------------------
            i.    Proper Actions and Documentation...........................9
            --    --------------------------------
            j.    Loans......................................................9
            --    -----
            k.    Shares Outstanding.........................................9
            --    ------------------
            l.    Consents...................................................9
            --    --------
ARTICLE 4 - REPRESENTATIONS AND WARRANTIES...................................9
- ------------------------------------------
      4.1   Representations and Warranties of Tri-County and the Subsidiaries9
      ---   -----------------------------------------------------------------
            a.    Organization of Tri-County.................................9
            --    --------------------------
            b.    Subsidiaries..............................................10
            --    ------------
            c.    Financial Statements......................................11
            --    --------------------
            d.    Absence of Undisclosed Liabilities........................11
            --    ----------------------------------
            e.    Absence of Certain Changes or Events......................11
            --    ------------------------------------
            g.    Tax Matters...............................................12
            --    -----------
            h.    Title to Properties; Absence of Liens and Encumbrances, Leases
            --    --------------------------------------------------------------
                  Enforceable...............................................13
                  -----------
            i.    Litigation................................................13
            --    ----------
            j.    Power of Attorney and Bank Accounts.......................14
            --    -----------------------------------
            k.    Proxy Statement...........................................14
            --    ---------------
            l.    Authority Relative to the Agreement.......................14
            --    -----------------------------------
            m.    Information Furnished to Platte Valley....................14
            --    --------------------------------------
            n.    Compliance with Laws......................................15
            --    --------------------
            o.    Employee Benefit Plans....................................15
            --    ----------------------
            p.    Insurance.................................................16
            --    ---------
            q.    Environmental Protection..................................16
            --    ------------------------
            r.    Employee Relations........................................17
            --    ------------------
            s.    Material Contract Defaults................................17
            --    --------------------------
            t.    Agreements with Regulatory Authorities....................17
            --    --------------------------------------
            u.    Certain Loans.............................................17
            --    -------------
            v.    Absence of Illegal or Improper Payments...................18
            --    ---------------------------------------
            w.    Regulatory Requirements...................................18
            --    -----------------------
            x.    Reserves..................................................18
            --    --------
            y.    Loan Documentation........................................18
            --    ------------------
            z.    Brokers and Finders.......................................18
            --    -------------------
      4.2   Representations and Warranties of Platte Valley and AcqCo.......19
      ---   ---------------------------------------------------------
            a.    Organization..............................................19
            --    ------------
            b.    Authority Relative to the Agreement.......................19
            --    -----------------------------------
            c.    Litigation................................................19
            --    ----------
            d.    Proxy Statement...........................................19
            --    ---------------
            e.    Funds Availability........................................20
            --    ------------------
            f.    Applications to Regulators................................20
            --    --------------------------
ARTICLE 5 - COVENANTS.......................................................20
- ---------------------
      5.1   Covenants of Tri-County.........................................20
      ---   -----------------------
            a.    Access to Information Concerning Properties and Records...20
            --    -------------------------------------------------------
            b.    Conduct of Business.......................................20
            --    -------------------
            c.    No Solicitation...........................................22
            --    ---------------
            d.    Information for Applications and Statements...............22
            --    -------------------------------------------
            e.    Shareholder Meeting.......................................22
            --    -------------------
            f.    Due Diligence.............................................22
            --    -------------
      5.2   Covenants of Platte Valley......................................22
      ---   --------------------------
            a.    Approvals of Regulatory Authorities.......................22
            --    -----------------------------------
            b.    Information for Proxy Statement...........................23
            --    -------------------------------
            c.    Due Diligence.............................................23
            --    -------------
            d.    Status Reports............................................23
            --    --------------
            d.    Directors and Officers Indemnification Insurance Coverage.23
            --    ---------------------------------------------------------
      5.3   Mutual Covenants................................................23
      ---   ----------------
            a.    Confidentiality...........................................23
            --    ---------------
            b.    Return of Documents.......................................24
            --    -------------------
            b.    Employees.................................................24
            --    ---------
ARTICLE 6 - MISCELLANEOUS...................................................24
- -------------------------
      6.1   Termination.....................................................24
      ---   -----------
            a.    Mutual Agreement..........................................24
            --    ----------------
            b.    Expiration of Time........................................24
            --    ------------------
            c.    Unsatisfied Conditions....................................24
            --    ----------------------
            d.    Breach....................................................25
            --    ------
            e.    Environmental Report......................................25
            --    --------------------
            f.    Review of Tri-County Disclosure Schedules.................25
            --    -----------------------------------------
      6.2   Termination; Lack of Survival of Representations and Warranties.25
      ---   ---------------------------------------------------------------
      6.3   Expenses and Damages............................................25
      ---   --------------------
      6.4   Exclusivity.....................................................26
      ---   -----------
      6.5   Desirable Amendments............................................26
      ---   --------------------
      6.6   Survival of Representations, Warranties and Covenants...........27
      ---   -----------------------------------------------------
      6.7   Benefits of this Agreement......................................27
      ---   --------------------------
      6.8   Employees and Employee Benefits.................................27
      ---   -------------------------------
      6.9   Notices.........................................................28
      ---   -------
      6.10     Publicity....................................................29
      ----     ---------
      6.11     Entire Agreement.............................................29
      -------------------------
      6.12     Waiver or Modification.......................................29
      -------------------------------
      6.13     Controlling Law..............................................29
      ------------------------
      6.14     Counterparts.................................................29
      ---------------------


Exhibit A       Form of Articles of Merger
Exhibit B       Current Net Operating Expenses
Exhibit C       Tri-County Disclosure Schedules
Exhibit D       Form of Legal Opinion of Rothgerber Johnson & Lyons LLP
Exhibit E       Form of Legal  Opinion  of  Manatt  Phelps &  Phillips,  LLP
Exhibit F       Form of Legal Opinion of local counsel
Exhibit G       Form of  Non-Competition  Agreement
Exhibit H       Form of Advisory  Board  Agreement
Exhibit I       Tri-County  Statements
Exhibit J       Employee Salaries









                   ACQUISITION AGREEMENT AND PLAN OF MERGER


      This  Acquisition  Agreement and Plan of Merger  ("Agreement")  is entered
into this  24th day of  January,  2001,  by and among  Platte  Valley  Financial
Service Companies,  Inc. ("Platte Valley"),  Platte Valley National Bank located
in Torrington, Wyoming ("Platte Valley National Bank"), Tri-County Bancorp, Inc.
("Tri-County"),  Tri-County Bank and Platte Valley Acquisition Company, Inc. (In
Organization) ("AcqCo").

                                    RECITALS:

      A. Platte  Valley is a financial  holding  company  organized and existing
under the laws of the State of Colorado,  having its  principal  offices at 1212
Circle Drive, Scottsbluff, Nebraska 69361.

      B. Platte Valley owns all of the capital stock of Platte Valley National
Bank, a national banking association.

      C. Tri-County is a registered  savings and loan holding company  organized
and existing under the laws of Wyoming having its principal offices at 2201 Main
Street, Torrington, Wyoming 82240.

      D.  Tri-County  owns  all of the  capital  stock  of  Tri-County  Bank,  a
federally  chartered  stock  savings  bank  ("Tri-County  Bank")  and all of the
capital  stock  of  First  Tri-County  Services,  Inc.,  a  Wyoming  corporation
("Tri-County Services"). Tri-County Bank and Tri-County Services are hereinafter
referred to together as the "Subsidiaries."

      E.  AcqCo will be a Colorado corporation organized as a wholly owned
subsidiary of Platte Valley solely for the purposes of acquiring Tri-County.

      F. The respective Boards of Directors of Platte Valley and Tri-County have
determined  that it is in the  best  interest  of said  corporations  and  their
respective  shareholders that Platte Valley acquire 100% of the capital stock of
Tri-County  through a merger of AcqCo with and into  Tri-County on the terms and
conditions hereinafter set forth.

      G. The  respective  Boards of  Directors of Platte  Valley and  Tri-County
have, by resolutions, approved and authorized the execution and delivery of this
Agreement on the terms and conditions set forth herein.

      THEREFORE, in consideration of the mutual covenants,  promises, agreements
and provisions contained herein and subject to the satisfaction of the terms and
conditions  set forth herein,  and intending to be legally bound hereby,  Platte
Valley and Tri-County agree as follows:


                   ARTICLE 1 - PRINCIPAL TERMS OF THE MERGER

      1.1 The Plan of  Merger.  Subject  to the  terms  and  conditions  of this
Agreement,  including the receipt of all requisite  regulatory  and  shareholder
approvals, the acquisition of Tri-County by Platte Valley (the "Merger") will be
carried out in the following manner:

            a. Tri-County will cooperate in the preparation and filing by Platte
Valley of such  applications  to regulatory  authorities  as may be necessary to
obtain all  approvals  requisite to the  consummation  of the Merger,  including
those described in Section 3.1(c) hereof.

            b. Platte Valley and  Tri-County  will each  cooperate and use their
respective  best efforts to consummate  the  transactions  contemplated  by this
Agreement.

            c.   Tri-County shall call a meeting of its shareholders to approve
the Merger and shall solicit proxies in favor of the Merger.

            d. Subject to the provisions of this  Agreement,  Articles of Merger
substantially in the form of Exhibit A attached  hereto,  shall be duly executed
and on the  Closing  Date  (as  defined  in  Section  1.2  hereof),  or as  soon
thereafter as reasonably practicable, filed with the Colorado Secretary of State
in accordance with the Colorado  Business  Corporation Act (the "CBCA") and with
the  Wyoming  Secretary  of  State  in  accordance  with  the  Wyoming  Business
Corporation  Act  ("WBCA").  The  Merger  shall  become  effective  at the  time
specified in the Articles of Merger (the "Effective Time").

            e.  At  the  Effective  Time,   AcqCo  shall  merge  with  and  into
Tri-County,  the separate  existence of AcqCo shall cease,  and Tri-County shall
continue  as the  surviving  corporation.  Tri-County,  in its  capacity  as the
corporation  surviving the Merger, is hereinafter  sometimes  referred to as the
"Surviving Corporation."

            f. For each outstanding  share of Tri-County common stock ($0.10 par
value)  ("Tri-County  Stock") held immediately  prior to the Effective Time, the
shareholders  of  Tri-County   (except  those   effectively   exercising   their
dissenter's  rights of  appraisal,  as  described  in Section 2.2 hereof,  shall
receive  cash in the  amount of $12.60 per share  (the  "Consideration")  with a
maximum of 883,969  shares of  Tri-County  Stock  (including  shares held by the
Tri-County ESOP) outstanding at the Closing Date.

            g. The  holders of options  for 72,207  shares of  Tri-County  Stock
shall  receive  total  consideration  not  to  exceed  $529,013.20,  as  further
described in Section 2.4, and each such option shall be canceled.

            h.  Tri-County's   expenses  attributable  to  the  negotiation  and
consummation of this Agreement and the  transactions  contemplated  hereby shall
not exceed  $200,000  and any amount  paid or  accrued in excess  thereof  shall
result in a reduction of the aggregate  Consideration paid in the amount of such
excess.

      1.2 Closing Date.  The "Closing Date" of the  transaction  shall be a date
which is at least ten (10) days after all of the conditions specified in Article
3 of this Agreement have all been satisfied and all applicable  waiting  periods
have  expired,  or such other date as is  mutually  agreed by the  parties.  The
closing of the transactions contemplated by this Agreement (the "Closing") shall
take place at the offices of  Rothgerber  Johnson & Lyons LLP, 1200 17th Street,
Suite 3000, Denver,  Colorado, on the Closing Date or at such other place as the
parties may agree.  At the  Closing,  the  parties  shall  exchange  the various
agreements, certificates,  instruments and documents to be delivered pursuant to
the terms of this Agreement.

      1.3  The Surviving Corporation.

            a. At the Effective Time,  AcqCo shall cease to exist and Tri-County
shall be the "Surviving  Corporation."  The articles of incorporation and bylaws
of Tri-County as in effect  immediately  prior to the Effective Time will remain
the  articles  of  incorporation  and  bylaws  of  Tri-County  as the  Surviving
Corporation  after the  Effective  Time until  amended or repealed in accordance
with their  provisions  and  applicable  law.  The  combined  capitalization  of
Tri-County  and  AcqCo  immediately  prior to the  Effective  Time  shall be the
capitalization  of Tri-County as the Surviving  Corporation  after the Effective
Time until  changed by  resolution of the Board of Directors or by action of its
shareholder.  Except  as set forth in  Section  3.3(g)  of this  Agreement,  the
directors and officers of Tri-County and Tri-County  Bank  immediately  prior to
the  Effective  Time shall  resign  effective  as of the Closing  Date and their
successors shall be elected or qualified.

            b. At and after the Effective Time, all rights,  privileges,  powers
and  franchises  and all  property and assets of every kind and  description  of
AcqCo and Tri-County shall be vested in and be held and enjoyed by the Surviving
Corporation,  without  further act or deed, and all the estates and interests of
every kind of AcqCo and  Tri-County,  including all debts due to either of them,
shall be as effectively  the property of the Surviving  Corporation as they were
of AcqCo  and  Tri-County,  and the title to any real  estate  vested by deed or
otherwise  in  either  AcqCo or  Tri-County  shall  not  revert or be in any way
impaired by reason of the  Merger.  All rights of  creditors  and liens upon any
property of AcqCo or  Tri-County  shall be preserved  unimpaired  and all debts,
liabilities and duties of AcqCo and Tri-County  shall be debts,  liabilities and
duties of the Surviving  Corporation and may be enforced  against it to the same
extent as if said debts, liabilities, and duties had been incurred or contracted
by it.

             ARTICLE 2 - DISTRIBUTIONS TO TRI-COUNTY SHAREHOLDERS

      2.1  Delivery of  Consideration.  On or  immediately  prior to the Closing
Date, Platte Valley shall deliver to Platte Valley National Bank as paying agent
(the "Paying Agent") the aggregate Consideration to be paid. Any interest earned
on such cash while in the hands of the Paying  Agent  shall be the  property  of
Platte  Valley.  The Paying Agent  subsequently  shall deliver to the holders of
certificates  formerly  evidencing  ownership of Tri-County  Stock, upon receipt
from the holders thereof of such certificates,  duly executed and in proper form
for  transfer,  the  Consideration  to which they are  entitled  pursuant to the
following provisions:

            a. As soon as practical  after the  Effective  Time the Paying Agent
shall send a notice and transmittal  form to each record holder of a certificate
evidencing  Tri-County  Stock,  advising  such  holder  of the  Merger  and  the
procedure for  surrendering to the Paying Agent such certificate in exchange for
the Consideration.  Each holder of such certificate,  upon surrender of the same
to the Paying Agent in accordance with such transmittal  form, shall be entitled
to receive the Consideration.

            b. No  transfer  taxes  shall be  payable by any holder of record of
Tri-County   Stock  at  the  Effective  Time  in  respect  of  the  exchange  of
certificates  for the  Consideration.  If the  Consideration  for the Tri-County
Stock  provided  for  herein is to be  delivered  to any  person  other than the
registered holder of the Tri-County Stock  surrendered for exchange,  the amount
of any  stock-transfer or similar taxes (whether imposed on the holder of record
or such person)  payable on account of the transfer to such person shall be paid
to the Paying  Agent by such  person.  The Paying  Agent may refuse to make such
exchange unless satisfactory evidence of the payment of such taxes, or exemption
therefrom, is submitted.

            c. After the Effective  Time,  each  outstanding  certificate  which
theretofore represented Tri-County Stock shall until surrendered for exchange in
accordance with this Section 2.1 be deemed for all purposes to evidence only the
right to receive the Consideration.  After the Effective Time, there shall be no
further registration or transfer of Tri-County Stock.

            d. Any portion of the Consideration  deposited with the Paying Agent
that remains  unclaimed by the former  holders of  Tri-County  Stock one hundred
eighty (180) days after the Effective Time shall be repaid or returned to Platte
Valley upon demand,  and holders of  Tri-County  Stock who have not  theretofore
complied  with this  Section  2.1 hereof  shall  thereafter  look only to Platte
Valley for payment of their claim for the Consideration.

            e. Notwithstanding anything to the contrary set forth herein, if any
holder of Tri-County  Stock shall be unable to surrender his or her certificates
because such certificates  have been lost or destroyed,  such holder may deliver
in lieu  thereof  an  indemnity  bond in form  and  substance  and  with  surety
satisfactory  to Platte Valley or such other  undertaking  as may be approved by
Platte Valley.

      2.2  Dissenting  Shareholders.  Any  shares of  Tri-County  Stock  held by
persons who have satisfied the requirements of the WBCA related to the rights of
dissenting  shareholders   ("Dissenters'  Rights"),  and  have  not  effectively
withdrawn or lost such Dissenters'  Rights,  shall not be converted  pursuant to
this  Agreement,  but  the  holders  thereof  shall  be  entitled  only  to such
Dissenters' Rights.  Each dissenting  shareholder who is entitled to payment for
his or her shares of Tri-County Stock pursuant to such Dissenters'  Rights shall
receive  payment from Platte Valley in an amount as determined  pursuant to such
Dissenters' Rights.

      2.3 Special Dividend.  If the Merger is not consummated on or before March
31,  2001,  Tri-County  may  declare  and pay a  special  cash  dividend  to its
shareholders  not  exceeding  the amount of  Tri-County's  Current Net Operating
Earnings and not exceeding $0.11 per share. "Current Net Operating Earnings" for
purposes  of this  Section  2.3 shall be  calculated  as set forth on  Exhibit B
attached hereto.

      2.4 Stock Options.  Simultaneous  with the Closing Date,  Tri-County shall
redeem and pay to the holders of options for an  aggregate  of 72,207  shares of
Tri-County  Stock an amount not to exceed  $529,013.20,  as follows:  holders of
options  for 68,207  shares  (with an exercise  price of $5.00 per share)  shall
receive  $7.60  per share and  holders  of  options  for 4,000  shares  (with an
exercise price of $9.94 per share) shall receive $2.66 per share.  Upon payment,
each such option shall be canceled.  The 5,978 options with an exercise price in
excess of $12.60 shall be canceled.  Tri-County  shall not grant any  additional
option for Tri-County Stock prior to the Merger.

      2.5   Benefit Plans.

            a. The  Tri-County  Federal  Savings and Loan  Association  Employee
Stock  Ownership  Plan and Trust  (the  "ESOP")  shall be  terminated  as of the
Closing Date according to its terms. The Tri-County  Federal Savings Bank 401(k)
Plan and Trust (the "401(k)  Plan") shall be terminated as of Tri-County  Bank's
last payroll date  immediately  preceding the Closing Date.  All other  employee
benefit plans maintained by Tri-County or Tri-County Bank, or any predecessor to
either,  other than the ESOP and the 401(k)  Plan (the  "Other  Benefit  Plans")
shall be terminated no later than the Closing Date.

            b. Tri-County and Tri-County  Bank shall take all actions  necessary
to effect the  termination of the ESOP and the 401(k) Plan and the Other Benefit
Plans as  provided  in this  Agreement;  provided,  however,  that  any  related
corporate  action by  Tri-County  and  Tri-County  Bank shall be provided to and
approved  by  counsel  for  Platte  Valley  prior to the time that the action is
taken.  Within 60 days after the Closing Date, Platte Valley through its counsel
shall prepare and submit a determination request to the Internal Revenue Service
with respect to the  termination  of the ESOP and of the 401(k) Plan. No benefit
will be  distributed  from the ESOP in connection  with the  termination of this
tax-qualified  plan  until a  favorable  ruling is  received  from the  Internal
Revenue Service with respect to the termination of this plan. No benefit will be
distributed  from the 401(k) Plan in  connection  with the  termination  of this
tax-qualified  plan  until a  favorable  ruling is  received  from the  Internal
Revenue Service with respect to the termination of this plan.

            c. Prior to the Closing Date,  Tri-County and Tri-County  Bank shall
have satisfied and discharged all of their  outstanding or accrued  obligations,
of every kind or description, with respect to the ESOP and the 401(k) Plan other
than any obligation  arising  exclusively in connection  with the termination of
either  such  tax-qualified  plan,  or minor  adjustments  with  respect to plan
operations as communicated by the plans'  administrators  to Platte Valley at or
prior to the Closing Date.

            d. Prior to the Closing Date,  Tri-County and Tri-County  Bank shall
have satisfied and discharged all of their  outstanding or accrued  obligations,
of every kind or description, with respect to the Other Benefit Plans.

                             ARTICLE 3 - CONDITIONS

      3.1 Mutual  Conditions.  The  obligations  of Tri-County and Platte Valley
under this Agreement are subject to and conditioned  upon the  satisfaction  of,
prior to and on the Closing  Date,  each of the following  conditions  except as
both Tri-County and Platte Valley may waive in writing:

            a. No Litigation.  Except as described in the Tri-County  Disclosure
Schedules  attached  hereto as  Exhibit  C  ("Disclosure  Schedules"),  no suit,
action,  claim or other proceeding  having been threatened or pending before any
court, administrative or governmental agency which, in the reasonable opinion of
Tri-County  or Platte  Valley,  presents  a  significant  risk of  restraint  or
prohibition  of  the  transactions  contemplated  hereby  or the  attainment  of
material  damages or other relief against  Tri-County or its  shareholders,  the
Subsidiaries, or Platte Valley or its shareholders in connection therewith.

            b.  Shareholder Approval. Approval of the Merger by the holders of
a majority of the outstanding shares of Tri-County Stock.

            c. Third-Party Approvals. Receipt of all authorizations,  approvals,
and/or consents as well as the expiration of applicable waiting periods,  of any
third parties without conditions, including federal or state governmental and/or
regulatory  bodies  and  officials,  necessary  for  the  consummation  of  this
Agreement and for the  continuation in all material  respects of the business of
Platte Valley,  Tri-County and the Subsidiaries,  without interruption after the
Effective  Time,  in  substantially  the  manner in which such  business  is now
conducted,  and no such authorizations or approvals shall contain any conditions
or restrictions that Platte Valley reasonably  believes will materially restrict
or limit  the  business  or  activities  of  Platte  Valley,  Tri-County  or the
Subsidiaries or have a material adverse effect on their  businesses,  operations
or financial conditions taken as a whole, including but not limited to:

                i.    Approval of the Federal Reserve Board for Platte Valley to
acquire Tri-County by the Merger and to engage in a non-banking activity;

                ii.  Approval of the Office of Thrift Supervision  ("OTS") for
Platte Valley to become a thrift  holding  company by the Merger and to move the
Tri-County Bank charter from its Torrington office to its Cheyenne office;

                iii.  Approval of the OTS and the Office of the  Comptroller  of
the Currency for  Tri-County  Bank to sell and for Platte Valley  National Bank,
1401 East M,  Torrington,  Wyoming,  to acquire  the  Torrington  and  Wheatland
branches of Tri-County Bank along with all of their assets and liabilities; and

                iv.  Approval of the OTS for a quasi-reorganization and/or for
Tri-County  Bank to pay a  dividend  or  otherwise  transfer  all of its  excess
capital to Platte Valley.

      3.2 Conditions in Favor of Tri-County. All obligations of Tri-County under
this Agreement are subject to and conditioned upon the satisfaction of, prior to
and on the Closing Date, each of the following  conditions  except as Tri-County
may waive in writing:

            a.   Representations,   Warranties  and   Agreements.   All  of  the
representations and warranties of Platte Valley, Platte Valley National Bank and
AcqCo contained in this Agreement or in any written statement, including without
limitation,  financial statements,  exhibits,  certificates,  schedules or other
documents  delivered  pursuant  hereto or in  connection  with the  transactions
contemplated hereby, being true in all material respects at the date hereof, and
at the Closing Date as if then made, and Platte Valley,  Platte Valley  National
Bank and AcqCo having performed and complied with all covenants,  agreements and
conditions  required by this  Agreement to be  performed or complied  with by it
prior to or at the Closing Date.

            b. Officer's Certificate.  Receipt by Tri-County of a certificate in
form and content satisfactory to Tri-County from the President of Platte Valley,
Platte  Valley  National  Bank and AcqCo,  dated the Closing Date, to the effect
that the  representations  and warranties  made herein by Platte Valley,  Platte
Valley  National  Bank or AcqCo were on the date hereof,  and are on the Closing
Date,  true and correct and that Platte Valley,  Platte Valley National Bank and
AcqCo have performed the  covenants,  obligations  and agreements  undertaken by
them herein.

            c. Secretary's  Certificate.  Receipt by Tri-County of a certificate
of the Secretary or an Assistant  Secretary of Platte Valley,  dated the Closing
Date, to the effect that all  necessary  approvals of the Merger by the Board of
Directors of Platte  Valley,  and by Platte  Valley as the sole  shareholder  of
AcqCo,  were  obtained at meetings  duly called for such  purposes and as to the
incumbency of all corporate officers of Platte Valley at all relevant times.

            d.  Legal  Opinion.  Receipt by  Tri-County of an opinion of legal
counsel for Platte Valley as of the Closing Date in the form attached  hereto as
Exhibit D.

            e.  Authorization of Merger.  All actions necessary to authorize the
execution, delivery and performance of this Agreement by Platte Valley and AcqCo
and the  consummation of the transactions  contemplated  hereby having been duly
and validly  taken by the Boards of  Directors of Platte  Valley and AcqCo,  and
AcqCo shall have full power and right to merge with Tri-County  pursuant to this
Agreement and the Articles of Merger.

            f.  Proper  Actions  and  Documentation.  All actions to be taken by
Platte Valley and AcqCo in connection with the transactions contemplated by this
Agreement  having been taken, all documents  incidental  thereto being in a form
and substance  reasonably  satisfactory to Tri-County and its legal counsel, and
Tri-County  having  received copies of all documents that it may have reasonably
requested in connection with such transactions.

            g. Fairness  Opinion.  Receipt by  Tri-County of a fairness  opinion
from  its  investment  banker  as  of  the  date  of  this  Agreement  that  the
Consideration  to be  received  by  Tri-County  shareholders  pursuant  to  this
Agreement is fair from a financial point of view and such opinion shall not have
been withdrawn on or before the Effective Time.

      3.3  Conditions in Favor of Platte Valley and AcqCo.  All  obligations  of
Platte  Valley  and AcqCo  under  this  Agreement  are  subject  to and shall be
conditioned  upon the satisfaction of, prior to and on the Closing Date, each of
the following conditions except as Platte Valley may waive in writing:

            a. Material  Adverse Change.  Since the date of this Agreement there
having been no material  adverse  changes,  occurrences or  developments  in the
business of  Tri-County or the  Subsidiaries  that have, or would be expected to
have,  a  material  adverse  effect on the  business,  operations  or  financial
condition of  Tri-County or the  Subsidiaries;  and Platte Valley shall not have
discovered  any  fact  or  circumstance  not  disclosed  by  Tri-County  or  the
Subsidiaries  prior to the date of this Agreement that has resulted in, or could
reasonably be expected to result in, a material  adverse effect on the business,
operations or financial condition of Tri-County or the Subsidiaries. A "material
adverse  change"  shall not  include  (i)  changes  caused by  general  economic
conditions or changes in prevailing  interest rates, (ii) payouts under existing
employment agreements as disclosed on the Disclosure Schedules, and (iii) costs,
fees and expenses related to the Merger not exceeding $200,000.

            b.   Representations,   Warranties  and   Agreements.   All  of  the
representations  and warranties of Tri-County and the Subsidiaries  contained in
this  Agreement,  in  any  attachment  or  exhibit  hereto,  or in  any  written
statement,  including,  without  limitation,  financial  statements,  Disclosure
Schedules,  deeds, exhibits,  certificates or other documents delivered pursuant
hereto or in connection with the transactions contemplated hereby, being true in
all  material  respects at the date  hereof,  and at the Closing Date as if then
made, and Tri-County and the Subsidiaries having performed and complied with all
covenants,  agreements and conditions required by this Agreement to be performed
or complied with by each of them prior to or at the Closing Date.

            c. Officers' Certificate.  Receipt by Platte Valley of a certificate
in form and content  satisfactory to Platte Valley,  from the Presidents of each
of Tri-County,  Tri-County Bank and Tri-County Services, dated the Closing Date,
to the effect that the  representations  and warranties made herein by each such
entity were on the date hereof, and are on the Closing Date, true and correct in
all  material  respects  and that  Tri-County,  Tri-County  Bank and  Tri-County
Services have performed the covenants,  obligations and agreements undertaken by
each of them herein.

            d.   Secretary's   Certificate.   Receipt  by  Platte  Valley  of  a
certificate of the Secretary or an Assistant Secretary of Tri-County,  dated the
Closing Date,  to the effect that all  necessary  approvals of the Merger by the
Board of Directors and shareholders of Tri-County were obtained at meetings duly
called for such purposes and as to the  incumbency of all corporate  officers of
Tri-County at all relevant times.

            e.  Legal  Opinions.  Receipt  by  Platte  Valley of  opinions  of
Tri-County's  legal counsel as of the Closing Date in the forms attached  hereto
as Exhibit E and Exhibit F.

            f.  Non-Competition/Advisory   Board  Agreements.  In  exchange  for
$4,800,  payable in twenty-four (24) equal monthly  installments,  each director
and the chief  executive  officer of  Tri-County  having  entered  into either a
Non-Competition  Agreement  in the  form  attached  hereto  as  Exhibit  G or an
Advisory  Board  Agreement  in the form  attached  hereto  as  Exhibit  H, to be
effective at the Closing Date.

            g.  Resignations  of  Officers  and  Directors.   All  officers  and
directors  of  Tri-County  and  Tri-County   Bank  shall  have  submitted  their
resignations  from such positions  effective as of the Closing Date, except that
Robert Savage shall have  submitted his  resignation as a director of Tri-County
Bank effective December 31, 2001, and as an officer of Tri-County and Tri-County
Bank and as a director of Tri-County as of the Closing Date.

            h.  Dissenters'  Rights.  No  more  than  2.0% of the  holders  of
outstanding  shares of Tri-County Stock shall have given notice that they intend
to assert Dissenters' Rights.

            i.  Proper  Actions  and  Documentation.  All actions to be taken by
Tri-County and the Subsidiaries in connection with the transactions contemplated
by this Agreement having been taken, all documents incidental thereto being in a
form and  substance  reasonably  satisfactory  to  Platte  Valley  and its legal
counsel,  and Platte Valley having  received copies of all documents that it may
have reasonably requested in connection with such transactions.

            j.  Loans.  Tri-County Bank shall have a loan loss reserve, credit
quality and loan  administration  which are  reasonably  satisfactory  to Platte
Valley as of the Closing Date.

            k.  Shares Outstanding. Tri-County shall have no more than 883,969
shares of Tri-County Stock outstanding on the Closing Date.

            l.  Consents  Tri-County  shall have  received  the  consents of all
creditors, lessors, vendors and other third parties as are necessary pursuant to
the contracts and other documents with which such persons conduct  business with
Tri-County and as may be required to effect the Merger.

                  ARTICLE 4 - REPRESENTATIONS AND WARRANTIES

      4.1  Representations  and Warranties of Tri-County  and the  Subsidiaries.
Except as set forth in its Disclosure Schedules or the Tri-County Statements (as
hereinafter  defined),  Tri-County  and the  Subsidiaries  hereby  represent and
warrant  to Platte  Valley as of the date  hereof  and up to and  including  the
Closing Date as follows:

            a.  Organization of Tri-County.

                i. Tri-County is a corporation duly organized,  validly existing
and in good standing  under the laws of the Wyoming,  and it has full  corporate
power and  authority,  and possesses all material  governmental,  regulatory and
other permits,  licenses and authorizations,  necessary to carry on its business
as now  conducted  and to own and operate the  properties  and assets it owns or
operates, to enter into this Agreement and to perform its obligations hereunder.

                ii. Tri-County's authorized capital stock consists of 10,000,000
shares  of  common  stock  ($0.10  par  value),  of  which  883,969  shares  are
outstanding, all of which are validly issued, fully paid and non-assessable, and
5,000,000  shares of serial  preferred  stock  ($0.10),  of which no shares  are
outstanding.

                iii. Tri-County has no outstanding  securities  convertible into
shares of capital stock or existing  options,  warrants,  calls,  commitments or
other rights of any character granted or entered into by Tri-County  relating to
its  authorized  or issued  stock and no such  rights will be granted or entered
into,  other than options for 78,185  shares of  Tri-County  Stock  described in
Section 2.4 hereto.

                iv.  There are no outstanding or unsatisfied preemptive rights
or rights of first refusal with respect to Tri-County's capital stock.

                v. No shares of Tri-County's  capital stock have been or will be
issued between the date hereof and the Closing Date.

                vi.  Attached  to the  Disclosure  Schedules  are  complete  and
correct  copies of  Tri-County's  articles of  incorporation  and  bylaws,  both
certified as of a then recent date by the Secretary of  Tri-County,  the same to
remain unchanged up to and including the Closing Date.

            b.  Subsidiaries.

                i.  Except for the  Subsidiaries,  Tri-County  does not have any
direct  or  indirect  subsidiaries  and  does  not  have  any  interest  in  any
partnership,  firm,  association,  corporation,  or  joint  venture  other  than
investment  securities  purchased and loans made in the regular and usual course
of its  business.  Tri-County  Bank is a savings  bank duly  organized,  validly
existing and in good standing as a SAIF-insured  financial institution under the
laws of the  United  States.  Tri-County  Services  is duly  organized,  validly
existing and in good standing under the laws of the State of Wyoming.

                ii.  Tri-County  Bank and  Tri-County  Services  each  have full
corporate  power and  authority,  and possess all  governmental,  regulatory and
other  permits,   licenses  and  authorizations  necessary  to  carry  on  their
businesses as they are now being conducted.

                iii.  The  outstanding  shares of  capital  stock of each of the
Subsidiaries  are validly  issued,  fully paid and  non-assessable  and all such
shares are owned of record and beneficially by Tri-County or Tri-County Bank and
are not subject to any security interest, lien, encumbrance or any adverse claim
of any kind.

                iv. There are no outstanding  securities convertible into shares
of capital stock or existing  options,  warrants,  calls,  commitments  or other
rights of any  character  granted or entered into by either of the  Subsidiaries
relating to the capital stock of these  subsidiaries  and no such rights will be
granted  or  entered  into and no  shares of these  subsidiaries  will be issued
between the date hereof and the Closing Date.

                v. Attached to  Tri-County's  Disclosure  Schedules are complete
and  correct  copies as of the date  hereof  of (A) the  charter  and  bylaws of
Tri-County  Bank  certified  by an  appropriate  officer and (B) the articles of
incorporation  and bylaws of  Tri-County  Services  certified by an  appropriate
officer, the same to remain unchanged up to and including the Closing Date.

            c. Financial Statements.  Attached hereto as Exhibit I are copies of
the following  consolidated  financial  statements for  Tri-County  ("Tri-County
Statements"),  all of which are accurate and complete in all material  respects,
are in accordance  with the books and records of Tri-County,  have been prepared
in accordance with generally accepted accounting principles consistently applied
throughout  for the  periods  indicated  and  present  fairly  the  consolidated
financial  position of Tri-County and the  consolidated  results of Tri-County's
operations  for the periods ended on the dates  indicated,  it being  understood
that  Tri-County's  interim financial  statements are not audited,  not prepared
with related notes and are subject to normal year-end adjustments:

            Consolidated  Statements of Financial Condition,  as of December 31,
            1999  and  1998,   and  the  related   consolidated   Statements  of
            Operations,  Stockholders'  Equity and Cash Flows for the years then
            ended,  audited  by  Dalby,  Wendland  & Co.,  P.C.,  and  unaudited
            consolidated  Statements  of Financial  Condition as of November 30,
            2000

            d. Absence of Undisclosed  Liabilities.  Except as and to the extent
reflected or reserved against in the Tri-County  Statements,  Tri-County and the
Subsidiaries have no material liabilities or obligations,  except those incurred
in the ordinary course of their business, whether accrued, absolute,  contingent
or  otherwise,   including,   governmental  charges  or  lawsuits,  or  any  tax
liabilities  due or to become due whether (i) incurred in respect of or measured
by the  consolidated  income  of  Tri-County  for any  period up to the close of
business on the respective dates of the Tri-County  Statements,  or (ii) arising
out of transactions entered into, or any state of facts existing, prior thereto.

            e. Absence of Certain Changes or Events. Since November 30, 2000,
and up to and including  the Closing Date, except as disclosed in the Disclosure
Schedules, there has not been:

                  i.    any material disposition of any of the assets of
Tri-County or the Subsidiaries other than in the ordinary course of its business
and for adequate consideration;

                  ii.   any capital improvements, except for ordinary
maintenance  and repairs,  by Tri-County or the  Subsidiaries or any purchase of
property by such  entities at a cost in excess of $10,000 other than supplies in
the ordinary course of business;

                  iii.  any physical damage, destruction or loss not covered by
insurance exceeding $10,000 in value or affecting in a material and adverse way
the property, assets, business or prospects of Tri-County or the Subsidiaries;

                  iv.   any material change in the accounting methods or
practices of Tri-County unless required by regulation or generally accepted
accounting principles;

                  v.    any material change in the capital structure, financial
condition, results of operation or business of Tri-County or the Subsidiaries;

                  vi. any  increase in the  compensation  payable,  or to become
payable,  by Tri-County or the Subsidiaries to any of its respective officers or
employees,  or any bonus, percentage  compensation,  service award or other like
benefit,  granted,  made or accrued to, or to the credit of, any of its officers
or  employees,  or any pension,  retirement,  deferred  compensation  or similar
payment or arrangement made or agreed to by Tri-County or the Subsidiaries other
than in accordance with preexisting  plans or established  standards,  copies of
which are attached to the Disclosure Schedules.

            f.    Tax Matters.

                  i.  Tri-County  and the  Subsidiaries  have filed all federal,
state, municipal and local income, excise,  property,  special district,  sales,
transfer and other tax returns and reports of information  statements  which are
required to be filed up to and including the date hereof and have paid all taxes
which have  become due  pursuant to such  returns or pursuant to any  assessment
which has become payable.  Tri-County and the  Subsidiaries  will hereafter file
such  returns as are  required to be filed by them prior to the Closing Date and
will pay all taxes which  become due pursuant to such returns or pursuant to any
assessments.

                  ii.   The returns filed and to be filed by Tri-County and the
Subsidiaries have been and will be accurately and properly prepared.

                  iii. To the extent that any tax  liability or  assessment  has
accrued as of  November  30,  2000,  but has not yet become  payable or has been
proposed for  assessment or  determination  as of November 30, 2000, but remains
unpaid,  the same has been  reflected  as a liability  on the November 30, 2000,
Tri-County Statements subject to normal year-end adjustments. Since November 30,
2000,  Tri-County  and the  Subsidiaries  have not incurred any  liability  with
respect to any such taxes except for normal  taxes  incurred in the ordinary and
regular  course  of their  business,  all of which  will be fully  accrued  as a
liability on the books of Tri-County or the Subsidiaries at the Closing Date.

                  iv. Tri-County and the Subsidiaries have not executed or filed
with the Internal  Revenue  Service or any other taxing  authority any agreement
extending the period for assessment or collection of any income taxes. As of the
date  of  this  Agreement,  there  are  no  examinations,   reviews,  audits  or
investigations  of any tax return or report of  Tri-County  or the  Subsidiaries
which are presently  pending or threatened,  and Tri-County and the Subsidiaries
are  not  parties  to any  pending  action  or  proceeding  by any  governmental
authority for assessment or collection of income taxes.

            g.    Title to Properties; Absence of Liens and Encumbrances, Leases
                  Enforceable.

                  i.  Tri-County and the  Subsidiaries  have good and marketable
title to their  assets,  real and  personal  (including  those  reflected in the
Tri-County Statements, except as thereafter sold or otherwise disposed of in the
ordinary course of business and for adequate  consideration),  free and clear of
all mortgages,  pledges, liens, charges and encumbrances,  except (A) investment
securities  which are pledged to secure the  deposit of public  monies or monies
under the control of any court, (B) the lien of taxes not yet due and payable or
being  contested  in  good  faith  by  appropriate  proceedings,  and  (C)  such
imperfections  of  title  and  encumbrances,  if any,  and such  liens,  if any,
incidental  to the conduct of their  respective  businesses  or the ownership of
their  respective  assets as are not  material  in amount  and do not affect the
value of, or  interfere  with the  present  use of,  their  assets or  otherwise
materially  impair their operations.  The Disclosure  Schedules briefly describe
all real property owned by Tri-County and the Subsidiaries.

                  ii. The structures  and equipment  owned or used by Tri-County
and the Subsidiaries comply with all applicable laws, regulations and ordinances
and are in good operating condition, subject to ordinary wear and tear.

                  iii. The real  property,  if any,  leased by Tri-County or the
Subsidiaries  is held under valid and  enforceable  leases,  copies of which are
attached to the Disclosure Schedules. Tri-County and the Subsidiaries are not in
default under any such leases. All rentals due and payable have been paid.

            h.  Litigation.  There  are  no  material  claims,  actions,  suits,
proceedings or investigations pending or threatened, by or against, or otherwise
materially affecting Tri-County or the Subsidiaries,  or their assets,  business
or properties,  or the  transactions  contemplated by this  Agreement,  or their
directors,  officers or employees in reference to actions  taken by them in such
capacity at law or in equity, or before or by any federal,  state,  municipal or
other government  department,  commission,  board,  agency,  instrumentality  or
authority, nor, to Tri-County's knowledge, is there any valid basis for any such
action, proceeding or investigation, other than (i) claims by Tri-County and the
Subsidiaries  in the ordinary course of their business for the recovery of loans
or protection  of their  interest as a secured or unsecured  creditor,  and (ii)
claims fully covered by insurance.

            i. Power of Attorney and Bank Accounts. The Disclosure Schedules set
forth (A) the names of all persons  holding a power of attorney from  Tri-County
or the Subsidiaries,  (B) the name of each bank in which Tri-County or either of
the  Subsidiaries has an account and (C) a list of all loans or loan commitments
in which Tri-County or either of the  Subsidiaries has only a participation  and
which are serviced by a third person.

            j. Proxy Statement.  The information relating to the proxy statement
for the  meeting of  Tri-County  shareholders  to vote upon the Merger  shall be
accurate  and  complete in all  material  respects,  shall not omit to state any
material  fact  required  to be stated  therein or  necessary  to  prevent  such
information  from being  misleading,  and shall comply in all material  respects
with the requirements of federal securities laws.

            k.    Authority Relative to the Agreement.

                  i. The execution,  delivery and  performance of this Agreement
by Tri-County and Tri-County Bank has been duly and  effectively  authorized and
approved by the Boards of Directors of Tri-County and Tri-County  Bank,  subject
to the required vote of the  Tri-County  shareholders,  and subject to obtaining
the regulatory approvals and other consents contemplated by this Agreement.

                  ii. This  Agreement  has been duly  executed and  delivered by
Tri-County and Tri-County Bank and constitutes a valid and binding obligation of
Tri-County and Tri-County Bank enforceable in accordance with its terms,  except
as such enforceability may be limited by applicable bankruptcy,  reorganization,
insolvency,  moratorium  or  other  similar  laws  affecting  creditors'  rights
generally and principles of equity (regardless of whether such enforceability is
considered in a proceeding in equity or at law);

                  iii. The consummation of the transactions contemplated by this
Agreement will not in any material respect conflict with, violate or result in a
material  breach  of or  material  default  of in (A)  any  term,  condition  or
provision  of the  articles  of  incorporation  or bylaws of  Tri-County  or the
charter,  articles  of  incorporation  or  bylaws of the  Subsidiaries;  (B) any
applicable law, rule,  regulation or order of any court or governmental  agency;
or (C) any material agreement,  lease, mortgage, note, contract or commitment of
any kind,  oral or  written,  formal or  informal,  to which  Tri-County  or the
Subsidiaries is a party or by which they or their  respective  properties may be
bound.

            l. Information  Furnished to Platte Valley. The documents  furnished
by Tri-County to Platte Valley (the "Tri-County  Documents"),  including but not
limited  to the  Disclosure  Schedules  attached  hereto  as  Exhibit  C and the
Tri-County Statements, are true and complete copies of such documents and do not
contain any untrue statement of a material fact or omit to state a material fact
necessary  in order to make the  statements  made  therein,  in the light of the
circumstances under which they were made, not misleading. Except as contemplated
by this  Agreement,  there is no fact which  Tri-County has not disclosed in the
Tri-County  Documents,  which  materially and adversely  affects the properties,
business, prospects, profits or condition (financial or otherwise) of Tri-County
or the  Subsidiaries  or the ability of  Tri-County  to perform this  Agreement,
except that Tri-County makes no  representation  or warranty as to the effect of
general  economic  conditions,  the condition of the financial  markets,  future
legislation or future regulatory action.

            m.    Compliance with Laws.

                  i. Tri-County and the Subsidiaries have all permits, licenses,
authorizations, orders and approvals of, and have made all filings, applications
and  registrations  with,  federal,  state,  local or  foreign  governmental  or
regulatory  bodies  that are  required  in order to permit  them to own or lease
their  properties  and  assets  and to  carry  on their  business  as  presently
conducted and that are material to their business;  all such permits,  licenses,
certificates  of  authority,  orders and  approvals are in full force and effect
and, to the best knowledge of Tri-County,  no suspension or  cancellation of any
of them is threatened; and all such filings,  applications and registrations are
current.

                  ii. The conduct by Tri-County  and the  Subsidiaries  of their
business  and the  condition  and use of their  properties  does not  violate or
infringe, in any respect material to any such business,  any applicable domestic
(federal,  state or  local) or  foreign  law,  statute,  ordinance,  license  or
regulation.

                  iii.  Neither  Tri-County nor the  Subsidiaries are in default
under any order, license,  regulation or demand of any federal, state, municipal
or other governmental  agency or with respect to any order, writ,  injunction or
decree of any court.

                  iv. Except for statutory or regulatory restrictions of general
application,  no federal,  state,  municipal or other governmental authority has
placed any  restriction  on the  business or  properties  of  Tri-County  or the
Subsidiaries which reasonably could be expected to have a material effect on the
business or properties of Tri-County or the Subsidiaries taken as a whole.

            n.    Employee Benefit Plans.

                  i. True,  accurate and complete  copies of all pension  plans,
retirement  plans,   profit-sharing  plans,  deferred  compensation  agreements,
collective bargaining agreements,  insurance plans or any other similar employee
benefit plans,  agreements or  arrangements  of Tri-County and the  Subsidiaries
(the "Plans") are listed in the Disclosure  Schedules and have been furnished to
Platte Valley.

                  ii.  Each  Plan  which is  intended  to  provide  tax-deferred
benefits  under any provision of the Internal  Revenue Code of 1986, as amended,
(the  "Code"),  meets  all  requirements  that  must be met in  order  for  such
tax-deferred  benefits to be  available.  There has been no change in any of the
documents  delivered to Platte Valley under which each Plan is maintained and no
change,  since each Plan's most recent  valuation  date, in the operation of the
Plan which could be expected to adversely  affect or alter the tax status of, or
materially increase the cost of maintaining, any such Plan.

                  iii. The reporting and disclosure requirements of the Employee
Retirement  Income  Security Act of 1974  ("ERISA") and the Code, as applicable,
and the group health plan  continuation  coverage  requirements  of the Code and
ERISA have been fulfilled in all material respects.  Tri-County has furnished or
made available to Platte Valley copies of all filings, if any, with the Internal
Revenue  Service and the Department of Labor or other  applicable  authority for
each Plan's most recent plan year.

                  iv. Neither  Tri-County,  the Subsidiaries,  any of the Plans,
any of the trusts created under any Plan nor any trustee, administrator or other
fiduciary  of  a  Plan  has,  to  Tri-County's  best  knowledge,  engaged  in  a
"prohibited  transaction," as such term is defined in the applicable  provisions
of the Code or of ERISA,  or  otherwise  taken or omitted any action which could
subject the Plans, Tri-County, the Subsidiaries, any of the trusts created under
a Plan or any trustee or administrator  thereof,  or any party dealing with such
Plans or trusts, to a material tax or penalty on prohibited transactions imposed
by ERISA or the Code or otherwise, and neither Tri-County, the Subsidiaries, any
Plan, any trust created under a Plan nor any other  fiduciary of any Plan or its
attendant trust has breached its fiduciary  duties under ERISA in a manner which
could  result in a direct or indirect  material  liability  to  Tri-County,  the
Subsidiaries, or the trustee or administrator of any Plan.

                  v. The Pension Benefit Guaranty Corporation has not instituted
proceedings to terminate (or appoint a trustee to  administer)  any Plan, and no
event has occurred or  condition  exists which might  constitute  grounds  under
ERISA for the termination of (or the appointment of a trustee to administer) any
Plan.

                  vi. The minimum funding  requirements under the Code and ERISA
have been satisfied with respect to each Plan.

            o.    Insurance.  The properties of Tri-County and the Subsidiaries
are insured as disclosed in the Disclosure Schedules.

            p.    Environmental Protection.

                  i. To the best of Tri-County's  knowledge,  none of the assets
of Tri-County and the  Subsidiaries  (defined for purposes of this subsection as
the real property and tangible  personal  property owned or leased by Tri-County
or the Subsidiaries)  contain any hazardous  materials (defined as any substance
whose nature and/or quantity or existence,  use, manufacture or effect render it
subject to federal, state or local regulation as potentially injurious to public
health or  welfare,  including,  without  limitation,  friable  asbestos or PCBs
("Hazardous Materials"),  other than in such quantities which are incidental and
customary  for the  maintenance  and  operation of such assets  (e.g.,  cleaning
fluids) ("Incidental Quantities").

                  ii. No notice or other  communication  has been made or issued
by  any  governmental   agency  having   jurisdiction  over  Tri-County  or  the
Subsidiaries,  or any other person, with respect to any alleged violation of any
federal, state or local laws, rules, regulations, ordinances and codes governing
Hazardous Materials and which are applicable to the assets of Tri-County and the
Subsidiaries.

                  iii.  To the best of  Tri-County's  knowledge,  all  Hazardous
Materials  which  have been  remediated  from any  assets of  Tri-County  or the
Subsidiaries   prior  to  or  during  their   ownership  by  Tri-County  or  the
Subsidiaries have been handled in compliance with all applicable laws.

                  iv. To the best of Tri-County's knowledge, except as disclosed
in  Tri-County's  or the  Subsidiaries'  loan files as of November 30, 2000,  no
collateral  securing any loan made by Tri-County or the  Subsidiaries,  contains
any Hazardous Materials, other than in Incidental Quantities.

            q.  Employee  Relations.  Copies  of all  employment  and  severance
agreements between Tri-County and the Subsidiaries and their employees have been
delivered  to  Platte  Valley  and  are  listed  in  the  Disclosure  Schedules.
Tri-County and the Subsidiaries have complied with all federal,  state and local
laws or  regulations  applicable to them relating to the employment of labor and
the provisions of such laws or regulations relating to wages,  nondiscriminatory
hiring and employment practices and procedures the violation of which would have
a materially adverse effect on the financial condition,  operations or prospects
of Tri-County  or the  Subsidiaries.  No claim has been made nor any  proceeding
commenced against  Tri-County or Subsidiaries for any wages,  penalties or other
liabilities  for  failure to comply with any such laws or  regulations.  Neither
Tri-County  nor  the  Subsidiaries  is  subject  to  any  collective  bargaining
agreement with its employees.

            r. Material Contract Defaults.  Neither Tri-County nor either of the
Subsidiaries  is in  default  in any  material  respect  under  the terms of any
outstanding contract, agreement, lease or other commitment, which is material to
the business,  operations,  properties,  assets, or the condition,  financial or
otherwise,  of  Tri-County or the  Subsidiaries,  all of which are listed on the
Disclosure Schedules, or under the charter,  articles of incorporation or bylaws
of Tri-County or the Subsidiaries,  and no event has occurred which, with notice
or lapse of time,  or both,  may be or become an event of default under any such
contract, agreement, lease or other commitment or under the charter, articles of
incorporation,   articles  of  association,  or  bylaws  of  Tri-County  or  the
Subsidiaries.

            s. Agreements with Regulatory  Authorities.  Neither  Tri-County nor
either of the Subsidiaries is a party to any written  agreement or memorandum of
understanding with any federal or state  administrative  agency or commission or
other  governmental  authority or  instrumentality  charged with  supervision or
regulation  of banks or bank holding  companies  or engaged in the  insurance of
deposits which restricts materially the conduct of its business or in any manner
relates to its capital adequacy, its credit policies or its management.

            t. Certain Loans.  Tri-County and the  Subsidiaries  have not, as of
the date hereof,  and will not have as of the Closing Date, made any loan or any
commitment  to loan to any officer or director  of  Tri-County  or either of the
Subsidiaries,  or any affiliate of Tri-County,  the Subsidiaries or any director
of Tri-County or either of the  Subsidiaries,  other than has been  disclosed on
the books and records of  Tri-County  to the  Company and which meet  applicable
regulatory requirements.

            u. Absence of Illegal or Improper  Payments.  Neither Tri-County nor
either of the  Subsidiaries  has made any  payments to any  entities or persons,
governmental  or otherwise,  which  payments are required to be disclosed  under
applicable disclosure policies of any governmental  authority,  nor, to the best
knowledge and belief of Tri-County, have any directors, officers or employees of
Tri-County  or  either  of the  Subsidiaries  made  any  such  payment  in their
capacities  as  directors,  officer or employees of  Tri-County or either of the
Subsidiaries.

            v. Regulatory  Requirements.  Tri-County and the  Subsidiaries  have
accurately  prepared and timely filed with the appropriate  banking,  securities
and other  regulatory or  governmental  authorities  all  necessary  reports and
filings and have paid all fees and  assessments due and payable  therewith.  All
such reports and filings  complied in all material  respects  with all the rules
and regulations promulgated by the applicable regulatory authority. There are no
examinations,  reviews  or  investigations  of any  report or filing  concerning
Tri-County or the Subsidiaries by a regulatory  authority  (except for regularly
scheduled OTS and Federal Deposit Insurance Corporation  examinations) which are
currently pending or threatened, and neither Tri-County nor the Subsidiaries are
a part to any pending or threatened regulatory action or proceedings.

            w. Reserves. The reserve for possible loan and lease losses shown in
the Tri-County Statements is adequate in all material respects,  including under
the requirements of generally  accepted  accounting  principles,  to provide for
possible losses, net of recoveries  relating to loans previously charged off, on
loans  outstanding  and as a percentage of loans no less than the  percentage of
reserve to loans on November  30,  2000,  and other real  estate  owned has been
written  down  or  reserved  for  to  reflect  the  amount  Tri-County  and  the
Subsidiaries  could  expect to receive  for such real estate were it sold net of
the costs of sale.

            x. Loan Documentation.  The documentation relating to each loan made
by Tri-County Bank,  including  security  interests,  mortgages and other liens,
with respect to the collateral for such loans,  is adequate for the  enforcement
of the loan  except  for  inadequacies  that  will not in the  aggregate  have a
material  adverse  effect  on the  financial  condition  of  Tri-County  and the
Subsidiaries taken as a whole.

            y. Brokers and Finders.  Other than Keefe,  Bruyette & Woods,  Inc.,
neither  Tri-County,  the Subsidiaries nor any officer,  director or employee of
Tri-County or the Subsidiaries has employed any broker or finder or incurred any
liability  for any financial  advisory  fees,  brokerage  fees,  commissions  or
finder's  fees,  and no broker or finder has acted  directly or  indirectly  for
Tri-County  or  the  Subsidiaries  in  connection  with  this  Agreement  or the
transactions contemplated hereby.

      4.2  Representations  and  Warranties of Platte  Valley and AcqCo.  Platte
Valley,  Platte Valley  National Bank and AcqCo hereby  represent and warrant to
Tri-County  as of the date hereto and up to and  including  the Closing  Date as
follows:

            a. Organization.  Platte Valley and Platte Valley National Bank are,
and AcqCo will be upon the Closing Date,  corporations  duly organized,  validly
existing  and in good  standing  under the laws of the State of  Colorado or the
United States,  as the case may be, and have full corporate power and authority,
and possess all material  governmental,  regulatory and other permits,  licenses
and  authorizations  necessary to carry on their  respective  businesses  as now
conducted,  to enter  into  this  Agreement  and to  perform  their  obligations
hereunder.

            b.    Authority Relative to the Agreement.

                  i. The execution,  delivery and  performance of this Agreement
by Platte Valley has been duly and  effectively  authorized  and approved by the
Boards of Directors of Platte Valley and Platte Valley National Bank, subject to
obtaining the  regulatory  approvals  and other  consents  contemplated  by this
Agreement.

                  ii. The  approval  of the  shareholders  of Platte  Valley and
Platte  Valley   National  Bank  are  not  required  for   consummation  of  the
transactions contemplated by this Agreement.

                  iii.  This  Agreement  has been duly executed and delivered by
Platte  Valley and  Platte  Valley  National  Bank and  constitutes  a valid and
binding  obligation of Platte Valley and Platte Valley National Bank enforceable
in accordance with its terms,  except as such  enforceability  may be limited by
applicable bankruptcy,  reorganization,  insolvency, moratorium or other similar
laws affecting  creditors' rights generally and principles of equity (regardless
of whether such  enforceability  is  considered  in a proceeding in equity or at
law);

                  iv. The consummation of the transactions  contemplated by this
Agreement will not in any material respect conflict with, violate or result in a
material breach of or material  default in (A) any term,  condition or provision
of the articles of  incorporation,  charter or bylaws of Platte  Valley,  Platte
Valley National Bank or AcqCo; (B) any applicable law, rule, regulation or order
of any court or  governmental  agency;  or (C) any  material  agreement,  lease,
mortgage,  note, contract or commitment of any kind, oral or written,  formal or
informal, to which either Platte Valley, Platte Valley National Bank or AcqCo is
a party or by which they or their properties may be bound.

            c.  Litigation.  There  are  no  material  claims,  actions,  suits,
proceedings or  investigations  pending or threatened by or against or otherwise
materially  affecting Platte Valley,  Platte Valley National Bank or AcqCo which
would prevent or enjoin Platte Valley, Platte Valley National Bank or AcqCo from
carrying out their obligations under this Agreement.

            d. Proxy Statement. Information provided by Platte Valley and Platte
Valley  National  Bank in writing for  inclusion in the proxy  statement for the
meeting of Tri-County  shareholders to vote upon the Merger will be accurate and
complete in all  material  respects,  will not omit to state any  material  fact
required to be stated  therein or  necessary to prevent  such  information  from
being misleading, and will comply in all material respects with the requirements
of federal securities laws.

            e. Funds Availability. Platte Valley has or will have adequate funds
to pay the  Consideration.  Platte  Valley will  promptly  notify  Tri-County in
writing if Platte Valley becomes aware that it no longer has funds  available or
it appears  that funds will not be available  at the  Effective  Time to pay the
Consideration.

            f. Applications to Regulators.  All of the representations contained
in the  applications  filed by Platte Valley or Platte Valley National Bank with
regulators  with or on behalf of  Tri-County,  will be at the time the same were
made accurate in all material  respects,  except Platte Valley and Platte Valley
National Bank make no  representation  as to matter  contained  therein that are
based on  information  provided by  Tri-County to Platte Valley or Platte Valley
National Bank.

                              ARTICLE 5 - COVENANTS

      5.1 Covenants of Tri-County. Tri-County covenants with Platte Valley as an
inducement to Platte Valley to enter into this Agreement that:

            a.  Access  to  Information   Concerning   Properties  and  Records.
Tri-County will give to Platte Valley and to its counsel,  accountants and other
representatives  ("advisers"),  upon reasonable  notice,  during normal business
hours throughout the period prior to the Closing Date, full access to the books,
records,  customer and loan files, contracts,  and commitments of Tri-County and
the   Subsidiaries,   except  for   documents   as  to  which  there  exists  an
attorney-client  privilege  or except as  otherwise  restricted  by law. For the
period prior to the Effective  Time,  Tri-County  shall deliver to Platte Valley
such statements,  schedules and reports concerning the business,  operations and
financial condition of Tri-County and the Subsidiaries as are regularly provided
to their  Boards of Directors  at such times as they are  regularly  supplied to
their Boards of Directors.  Tri-County shall give notice to Platte Valley of all
board of directors and committee  meetings of Tri-County  and the  Subsidiaries.
Platte Valley shall be entitled, at its expense, to have a representative attend
any such meeting to observe and participate in discussion but not to vote on any
matter.

            b.    Conduct of Business.  Until the Effective Time or the earlier
termination of this Agreement,  and except as contemplated by this Agreement or
disclosed in the  Disclosure Schedules or as consented  to or otherwise approved
by Platte Valley in writing:

                  i. the business of Tri-County  and the  Subsidiaries  shall be
conducted only in the ordinary course which,  without limitation,  shall include
using  their best  efforts to maintain in force the  insurance  policies  now in
effect, or insurance policies  providing  substantially the same coverage to the
extent such coverage remains  available to Tri-County and the Subsidiaries  with
acceptable limitations and at a reasonable cost;

                  ii.   no change shall be made in the articles of incorporation
or bylaws of Tri-County or Tri-County Services and in the charter or bylaws of
Tri-County Bank;

                  iii.  no  change  shall be made in the  number  of  shares  of
capital stock of  Tri-County or the  Subsidiaries  issued and  outstanding,  nor
shall any option, warrant, call, convertible security, commitment or other right
be granted or made by either  Tri-County  or the  Subsidiaries  relating  to its
authorized or issued capital stock;

                  iv. no  purchase  order,  contract or  commitment  (other than
deposits,  loans,  loan  commitments  and  investments or the sale of other real
estate  owned  in  the  ordinary   course  of  business  of  Tri-County  or  the
Subsidiaries)  shall  be  entered  into by or on  behalf  of  Tri-County  or the
Subsidiaries extending for more than one year or involving payment by Tri-County
and the  Subsidiaries of more than $10,000 in any one contract or related series
of contracts or otherwise materially affecting their business;

                  v. no employment agreement or other agreement shall be entered
into with any employee of Tri-County or the Subsidiaries,  no salary or benefits
of any  employee  of  Tri-County  or the  Subsidiaries  shall be  increased,  no
employee benefit plan shall be modified or amended,  and no executive officer or
director bonuses shall be paid;

                  vi.  Tri-County  and the  Subsidiaries  shall use  their  best
efforts,  consistent with conducting their business in accordance with their own
business  judgment,  to retain their  depositors  and  customers and to preserve
their  business  in its  present  form  and to  preserve  the  good  will of the
depositors,  customers and others having business  relations with Tri-County and
the Subsidiaries;

                  vii.  Tri-County and the Subsidiaries shall duly comply in all
material  respects with all  applicable  laws,  the failure to comply with which
would have a material adverse effect upon their business or financial condition;

                  viii. no dividends shall be paid, or distributions made, with
respect to Tri-County Stock prior to the Closing, except for the cash dividend
described in Section 2.3 hereof;

                  ix.  no  security  shall  be sold  or  purchased  until  after
twenty-four (24) hours' prior written notice of such purchase or sale shall have
been  given to  Platte  Valley's  President  and  Platte  Valley's  approval  or
non-objection of such transactions shall not be unreasonably withheld.

                  x.   the obligations under all employment, severance or other
agreements between Tri-County and the Subsidiaries and their employees related
to the termination of such agreements shall not be in excess of $321,920.00.

                  xi.  no  loans  (A)  in  excess  of  $150,000,  or  (B) to any
director,  officer or affiliate  of  Tri-County  or either of the  Subsidiaries,
shall be approved  without  twenty-four  (24) hours' prior written notice to the
President of Platte Valley and Platte Valley's approval or non-objection of such
transactions shall not be unreasonably withheld.

            c. No Solicitation.  Tri-County, the Subsidiaries and their officers
and directors will not, and Tri-County  shall direct and use its best efforts to
cause its and the Subsidiaries  employees,  agents and  representatives  to not,
during the period  beginning on the date hereof and ending on the first to occur
of the Effective Time or the termination of this Agreement,  (i) sell or arrange
for the sale of any Tri-County or either of the Subsidiaries'  capital stock; or
(ii) negotiate, solicit or encourage or authorize any person to solicit from any
third party any proposals  relating to the merger or consolidation of Tri-County
or the Subsidiaries,  disposition of the business or assets of Tri-County or the
Subsidiaries  or the  acquisition  of the  capital  stock of  Tri-County  or the
Subsidiaries;  or (iii) except to the extent legally  required for the discharge
by the  board  of  directors  of its  fiduciary  duties,  make  any  information
concerning  Tri-County  or the  Subsidiaries  available  to any  person  for the
purpose  of  affecting  or causing a merger,  consolidation  or  disposition  of
Tri-County or the  Subsidiaries or their assets or common stock. If any offer is
received from another  party,  Tri-County  and its officers and directors  shall
promptly inform Platte Valley of the terms of that offer and the identity of the
offeror.

            d.  Information for  Applications  and Statements.  Tri-County shall
furnish  to  Platte  Valley  in  a  timely  manner  all  information  concerning
Tri-County  and  the  Subsidiaries  required  for  inclusion  in all  regulatory
applications  to be filed,  in any other  notices  or  statements  to be made by
Platte Valley to any  governmental or regulatory body required to consummate the
Merger.

            e.  Shareholder  Meeting.  As soon as practicable,  Tri-County shall
take all reasonable  action  necessary in accordance with applicable law and its
articles of  incorporation  and bylaws to convene a meeting of  shareholders  to
vote upon this Agreement and the Merger.  Subject to applicable laws, Tri-County
shall use reasonable  efforts to solicit from its shareholders  proxies in favor
of such  adoption  and  approval  and  shall  take all other  reasonable  action
necessary  or  helpful  to  secure  a vote of its  shareholders  in favor of the
Merger. The proxy statement relating to such meeting shall be approved by Platte
Valley prior to its filing with the Securities and Exchange Commission, and such
approval shall not be unreasonably withheld.

            f.    Due Diligence.  Tri-County shall use its best efforts to
deliver by the Closing  Date all  opinions,  certificates  and other  documents
required to be delivered  by it and to cause all  conditions  to Closing  being
satisfied in a timely manner.

      5.2   Covenants of Platte Valley.  Platte Valley covenants with Tri-County
as an inducement to Tri-County to enter into this Agreement that:

            a.  Approvals of  Regulatory  Authorities.  As soon as  practicable,
Platte Valley shall file applications with the proper regulatory authorities for
approval of the Merger and the  acquisition  of  Tri-County by Platte Valley and
all related transactions including,  but not limited to, the approvals set forth
in Section 3.1(c) of this Agreement,  and shall  thereafter take all action with
due  diligence to obtain the  approval of such  regulatory  authorities.  To the
extent permitted by law, all filings, requests for approval or other submissions
for any  regulatory  approval  shall be made  available for review by Tri-County
prior to filing.

            b. Information for Proxy  Statement.  Platte Valley shall furnish to
Tri-County in a timely manner any requested information concerning Platte Valley
and its subsidiaries  required for inclusion in Tri-County's  proxy statement to
be filed with the  Securities  and Exchange  Commission and mailed to Tri-County
shareholders.

            c.    Due Diligence.  Platte Valley shall use its best efforts to
deliver by the Closing Date all opinions,  certificates and other documents
required to be delivered  by it and to cause all  conditions  to Closing  being
satisfied in a timely manner.

            d. Status Reports.  Platte Valley shall advise  Tri-County from time
to time regarding Platte Valley's  applications  for regulatory  approval of the
Merger  and  provide  Tri-County  with  copies  of all  applications,  comments,
correspondence  and  approvals  to or from  regulators  in  connection  with the
applications.

            d. Directors and Officers Indemnification  Insurance Coverage. For a
period of three (3) years after the Effective Time,  Platte Valley shall provide
to the persons who served as directors or officers of  Tri-County  or Tri-County
Bank on or before the Effective Time insurance  against  liabilities  and claims
(and related  expenses)  made against them  resulting from their service as such
prior to the Effective Time,  substantially  similar in all material respects to
the insurance  coverage  provided to them in such capacities of the date hereof;
provided,  however,  if  Platte  Valley  is unable  to  maintain  or obtain  the
insurance called for by this Section on commercially  reasonable  terms,  Platte
Valley  shall use its best  efforts to obtain as much  comparable  insurance  as
available.  In  lieu of the  foregoing,  Tri-County  shall  renew  any  existing
insurance or purchase any "discovery  period" insurance  provided for thereunder
at Platte Valley's request and Tri-County's expense.

      5.3   Mutual Covenants.  Each party covenants to the other party as an
inducement to enter into this Agreement that:

            a.  Confidentiality.  Each party agrees  recognizes and acknowledges
that the data and information it shall or may obtain from the other party during
the due diligence  review (the  "Information")  comprise  valuable,  special and
unique  assets of the other  party.  Each  party and its  employees,  agents and
representatives  shall hold in  confidence  any and all of the  Information  and
shall  not,  in whole or in part,  disclose  the  Information  to any  person or
business  for any  reason or purpose  whatsoever,  and shall not make use of any
such  Information  for any reason or purpose other than to evaluate the proposed
acquisition. These restrictions shall not apply to such Information (A) which is
at the time of  disclosure  in the  public  domain  other  than as a  result  of
confidential  disclosure by the party;  (B) which was disclosed by a third party
not  subject to any  restrictions  on  disclosure;  (C) which is  required to be
disclosed  by the  order  of a court  or  other  competent  authority  or  under
applicable law; or (D) with respect to which a party may have given its consent.
Further,  each  party  may  disclose  the  Information  to  its  legal  counsel,
accountants  and other  professional  advisors  subject  to their  agreement  to
maintain the  Information  in strict  confidence  and not to disclose or use the
Information,  in whole or in part,  other  than in the course of  advising  such
party.  In the  event a party  is  requested  or  required  by a court  or other
confident  authority or under applicable law to disclose the  Information,  such
party shall give the other party prompt notice of such request or requirement to
enable the party to seek an appropriate  protective order, and shall consult and
cooperate  with the party in  attempting  to resist or narrow  the scope of such
requests or requirement.

            b.  Return  of  Documents.  In the  event  that  the  Merger  is not
consummated,  or this  Agreement  is  otherwise  terminated,  each  party  shall
promptly return to the other party all such  confidential  information  (and all
copies thereof),  without  retaining any copies,  or to the extent agreed by the
other  party,  shall  destroy  information  and  documents  not to be  returned,
including all  electronic  images;  and thereafter  all such  information  shall
continue not to be disclosed by each such party and their  directors,  officers,
employees,  agents and advisers to third parties  without the written consent of
the other party.

            b. Employees. In the event this Agreement is terminated, the parties
hereto  further agree that they will not solicit for employment by such party or
any related  entities  (including  but not limited to wholly or partially  owned
subsidiaries or affiliates in which any of such party's  representatives  have a
controlling interest) any of the officers of the other party so long as they are
employed by the other party for a period of two years after  termination  of the
Agreement  without  obtaining the prior written consent of the other party.  For
the purposes of this Agreement,  "solicit for employment"  shall not include (i)
referrals  made by a  placement  agency  or  service  or (ii)  responses  to any
advertisement appearing in a newspaper, magazine or trade publication.

                            ARTICLE 6 - MISCELLANEOUS

      6.1 Termination. This Agreement may be terminated and the Merger abandoned
(either before or after  approvals and  authorizations  by the  shareholders  of
Tri-County contemplated hereby and without seeking further shareholder approval)
at any time prior to the Effective Time only in one of the following manners:

            a.    Mutual Agreement.  By mutual written consent of the parties
authorized by their respective Boards of Directors at any time prior to the
Effective Time.

            b.    Expiration of Time.  By written notice from Tri-County to
Platte Valley or from Platte Valley to Tri-County, if the Closing Date shall not
have occurred on or before June 30, 2001.

            c.  Unsatisfied  Conditions.  By written  notice from  Tri-County to
Platte Valley or from Platte Valley to  Tri-County,  as the case may be, stating
that the party giving such notice elects to terminate this Agreement and abandon
the transaction  contemplated  hereunder as of a stated date, which shall not be
less  than ten  business  days  after  the date on which  such  notice is given,
because the party  providing  such notice will be unable,  on or before June 30,
2001,  after having  exercised all  reasonable  efforts and actions,  to meet or
satisfy one or more  specified  conditions  precedent to the  obligation  of the
other party to close  under this  Agreement,  unless the other party  waives the
satisfaction of such conditions precedent within such ten-day period.

            d. Breach.  By written  notice from Platte  Valley to  Tri-County or
from Tri-County to Platte Valley, in the event of a material breach by the other
party  hereto  of any  representation,  warranty,  covenant  or other  agreement
contained in this  Agreement,  which breach is not cured after thirty (30) days'
written notice thereof is given to the party committing such breach by the other
party.

            e. Environmental  Report. Platte Valley shall have the right, in its
discretion and at its sole expense, to arrange with an environmental  consultant
to prepare an environmental report on any property owned or leased by Tri-County
or the  Subsidiaries.  If  such  report  indicates  the  presence  of  Hazardous
Materials  on  any  such  property  or  properties  and  if the  costs  for  any
remediation  indicated  by such  reports are deemed  material by Platte  Valley,
Platte Valley shall have the right to terminate this Agreement by written notice
to Tri-County.

            f.    Review of Tri-County Disclosure Schedules.  By Platte Valley
within five (5) business days of receipt by Platte Valley of the Tri-County
Disclosure Schedules.

      6.2 Termination;  Lack of Survival of Representations  and Warranties.  In
the event of the  termination  and  abandonment  of this  Agreement  pursuant to
Section 6.1 herein, this Agreement shall become void and have no effect,  except
that (i) the provisions of Sections 5.3 (Mutual Covenants) and 6.3 (Expenses and
Damages) of this Agreement shall survive any such  termination and  abandonment.
Termination  shall not relieve the breaching party from liability for an uncured
intentional  and willful  breach of a  representation,  warranty,  covenant,  or
agreement giving rise to such termination.

      6.3   Expenses and Damages.

            a. Payment of Own Expenses.  Except as provided below and in Section
6.4  herein,  each  party  shall pay its own  expenses  in  connection  with the
Agreement  and the Merger.  Any expenses  incurred by any  executive  officer of
Tri-County  for tax planning or  employment-related  issues shall be  considered
personal expenses and not Tri-County  corporate  expenses.  Nothing contained in
this  Section  6.3 shall be deemed to preclude  either  from  seeking to recover
damages  which it  incurs  as a result  of  breach  by the  other  party of this
Agreement  or to obtain  other legal or  equitable  relief  (including  specific
performance).

            b.    Tri-County Termination.  Platte Valley shall pay Tri-County
$150,000 in the event Tri-County terminates this Agreement pursuant to Section
6.1(d).

            c.    Platte Valley Termination.  Tri-County shall pay Platte Valley
$150,000 in the event Platte Valley terminates this Agreement pursuant to
Section 6.1(d).

      6.4   Exclusivity.

            a. Tri-County agrees that it, or any of its Subsidiaries,  shall not
solicit or encourage  inquiries  or proposals  with respect to, or engage in any
negotiations concerning, or provide any confidential information to, or have any
discussions  with, any person relating to, any Acquisition  Proposal (as defined
in this Section 6.4), and shall immediately cease and cause to be terminated any
activities,  discussions  or  negotiations  conducted  prior to the date of this
Agreement with any parties concerning any Acquisition Proposal. Tri-County shall
promptly advise Platte Valley of the receipt of any Acquisition Proposal and the
substance thereof  (including the identity of the person making such Acquisition
Proposal). For purposes of this Section 6.4, an "Acquisition Proposal" means any
tender or exchange offer, proposal for a merger, consolidation or other business
combination or similar transaction involving Tri-County or any of its respective
Subsidiaries  or any  proposal or offer to purchase or acquire in any manner all
or a majority of the voting  ownership,  beneficial  ownership  or right to vote
securities  in, or a majority of the assets or deposits of  Tri-County or any of
its respective  Subsidiaries,  other than the  transaction  contemplated by this
Agreement.

            b. In the event that  Tri-County,  during the term of this Agreement
and without having  received the written  consent of Platte  Valley,  shall have
determined in accordance  with its  fiduciary  duties to accept any  Acquisition
Proposal or to recommend to its  shareholders  that any Acquisition  Proposal be
approved or accepted,  then Tri-County so determining or  recommending  shall be
liable to Platte  Valley in the amount of Four Hundred  Fifty  Thousand  Dollars
($450,000) as liquidated damages, the payment of which shall be made at the time
of the acceptance of any Acquisition Proposal. It is acknowledged and understood
by Tri-County  that the  calculation,  ascertainment  or  quantification  of the
amount of monetary  damages  which would be sustained  by Platte  Valley to this
Agreement as a result of the acceptance or  recommendation  of acceptance of any
Acquisition  Proposal by the  Tri-County is uncertain and  problematic  and that
Platte Valley would suffer  substantial  damages to its business and  operations
which cannot be measured in monetary  terms,  and recognizing  such,  Tri-County
agrees  that the  foregoing  amount  of  liquidated  damages  is its  reasonable
estimate of the amount of damages  which would be  sustained  by Platte  Valley,
during the term of this  Agreement  and  without  having  received  the  written
consent of Platte  Valley,  shall  have  determined  to accept  any  Acquisition
Proposal or to recommend to its  shareholders  that any Acquisition  Proposal be
approved or accepted.

      6.5 Desirable  Amendments.  Subject to the  performance  of the respective
fiduciary  obligations of each party,  if at any time after the date hereof,  it
shall  appear that any change or changes in the  structure  of the  transactions
contemplated  hereby shall be  necessary or desirable or comply with  applicable
law,  or to  comply  with the  requirements  of  regulatory  authorities  having
jurisdiction over the transactions so as to enable the transactions contemplated
hereby to be consummated,  the parties hereto agree to use their best efforts to
effect  such  changes in this  Agreement  and the other  documents  contemplated
hereby in taking such other  actions as may be required to effect such  changes,
provided  that neither  party hereto shall be required to agree to any change in
the amount or form of consideration set forth herein.

      6.6 Survival of Representations,  Warranties and Covenants. The respective
representations,  warranties,  agreements  and  covenants of the parties in this
Agreement shall survive the Effective Time for a period of two years. Each party
shall be deemed to have relied upon each and every  representation  and warranty
of the other party, regardless of any investigation heretofore or hereafter made
by or on behalf of such party.

      6.7  Benefits  of  this  Agreement.  This  Agreement  and the  rights  and
obligations of Platte Valley and Tri-County  hereunder  shall not be assigned by
any party to any third  party,  except  with the prior  written  consent  of the
other.  This  Agreement  shall be binding  upon and inure to the  benefit of the
parties hereto and their respective permitted successors and assigns. Nothing in
this  Agreement,  expressed  or implied,  is intended to confer upon any person,
other  than the  parties  hereto,  the  shareholders  of  Tri-County,  and their
respective  permitted successors and assigns, any rights or remedies under or by
reason  of  this  Agreement  and,  except  as for  Sections  2.5 and 6.8 of this
Agreement, there are no third-party beneficiaries of this Agreement.

      6.8   Employees and Employee Benefits.

            a. All employees of  Tri-County  shall be evaluated by Platte Valley
for retention or elimination  prior to the Effective Time. With the exception of
employees that are parties to employment or severance agreements with Tri-County
or Tri-County Bank, Platte Valley agrees that for a period of twelve (12) months
following the Effective Time, any employee of Tri-County  Bank whose  employment
is involuntarily  terminated by Platte Valley for a reason other than just cause
on or after the Effective Time shall be entitled to receive a severance  payment
equal to two weeks of salary in effect as of December 31, 2000, for each year of
service to Tri-County Bank with a maximum of three (3) months.

            b. All employees of  Tri-County  who continue as employees of Platte
Valley after the Merger shall (i) notwithstanding Section 6.8(a), continue their
regular salary in effect on the Closing Date until the earlier to occur of their
termination of employment or December 31, 2001; (ii) receive service credits for
employment at Tri-County prior to the Effective Time for purposes of meeting the
eligibility  requirements and vesting requirements for all Platte Valley benefit
programs  which such  employees  shall become  eligible to  participate in on or
after the Effective Time including, but not limited to, retirement, vacation (as
set forth in Section  6.8(c)),  sick leave (as set forth in Section 6.8(d),  and
health and disability  plans (as set forth in Section 6.9(d);  and (iii) receive
in cash all accrued  vacation as of December 31, 2000, as set forth in Exhibit J
attached hereto.

            c. Platte Valley's  vacation time policy is earned in the year prior
to the year in which it is taken.  However,  transitional  vacation advances for
2001 will be given to all Tri-County  employees  retained based on their service
credits of employment at Tri-County. If any Tri-County employee should terminate
their  employment  with Platte  Valley or be  terminated  by Platte Valley on or
before  December  31,  2001,  any  vacation  taken by employees in 2001 shall be
reimbursed to Platte Valley by employee.

            d. Any Tri-County  employee who has accrued sick leave  available on
December 31, 2000,  will be allowed  "Banked Days" per Platte  Valley's  "Banked
Policy" as follows:  "any  vacation / illness  days not taken during the year in
which they were awarded will be banked (up to six days maximum) for use the next
year towards a  catastrophic  illness,  surgery or accident,  as outlined in the
Medical Leave of Absence Policy--an absence due to illness,  disability,  mental
health or chemical  dependency,  which extends  beyond six working days, but not
more than 21 days and is  requested  in writing,  accompanied  by an  acceptable
physician's  statement,  and is  approved  in  advance  by the  supervisor,  the
division  /   department   manager   and  the   Corporate   Director   of  Human
Resource--Section  V, Page 5.5 and 5.6.  Any unused  banked days will be cleared
annually on December  31st and a new bank  started  each year from the  previous
year's unused illness/vacation days."

            e. No full-time  Tri-County  employee or dependant of such  employee
shall be subject to any  uninsured  waiting  periods of  pre-existing  condition
exclusions under any plan of Platte Valley or its subsidiaries,  except when (i)
there was more than a 63-day  period  between the end of the prior  coverage and
enrollment for the Platte Valley  coverage,  during which the individual was not
covered under any creditable  coverage;  and (ii) the employee or covered person
cannot provide satisfactory  evidence of creditable coverage for 12 months prior
to  the  Closing  Date.  However,  if  the  employee  or  covered  person  has a
pre-existing  condition and cannot provide  satisfactory  evidence of creditable
coverage  for the 12 months  prior to the  Closing  Date,  such  person  will be
treated for purposes of coverage under Platte Valley's  benefit plan as he would
have been treated under the Tri-County benefit plan.

      6.9 Notices.  Any notice,  request,  instruction,  legal process, or other
instrument  to be given or served  hereunder  by any party to another,  shall be
deemed  given or  served  if in  writing  and  delivered  personally  or sent by
registered  or certified  mail,  postage  prepaid,  to the  respective  party or
parties at the following addresses:

      If to Platte Valley:      Platte Valley Financial Service Companies, Inc.
                                Attn: H. Hod Kosman, President
                                1212 Circle Drive
                                Scottsbluff, Nebraska 69363-2308

      With copies to:           Rothgerber Johnson & Lyons LLP
                                Attn:  Karen L. Witt, Esq.
                                1200 17th Street, Suite 3000
                                Denver, CO 80202

      If to Tri-County:         Tri-County Bancorp, Inc.
                                Attn: Robert L. Savage, President
                                2201 Main Street
                                Torrington, Wyoming 82240-2317

      With copies to:           Gregory A. Gehlmann, Esq.
                                Manatt, Phelps & Phillips, LLP
                                1501 M Street, N.W., Suite 700
                                Washington, DC 20005-1702

and to such other person or address or  addresses as either party may  designate
to the other by like notice as set forth above.

      6.10  Publicity.  Tri-County  and Platte Valley shall have all  publicity,
press  releases  and other  announcements  relating to this  Agreement,  and the
transactions  contemplated hereby, reviewed in advance by both Platte Valley and
Tri-County.

      6.11  Entire  Agreement.  This  Agreement  contains  the entire  agreement
between the parties hereto with respect to the transactions  contemplated hereby
and thereby supersedes all prior and contemporaneous agreements, understandings,
negotiations and discussions, whether oral or written, of the parties, and there
are no warranties,  representations,  covenants or other agreements  between the
parties in connection with the subject matter hereof except as specifically  set
forth herein.

      6.12 Waiver or Modification.  Any party to this Agreement may, at any time
prior to the  Effective  Time,  by  action  taken by its Board of  Directors  or
officers thereunto duly authorized, waive any of the terms or conditions of this
Agreement  or agree to an  amendment  or  modification  to this  Agreement by an
agreement  in writing  executed in the same manner (but not  necessarily  by the
same persons) as this  Agreement.  No amendment,  modification or waiver of this
Agreement  shall be binding unless  executed in writing by the party to be bound
thereby. No waiver of any of the provisions of this Agreement shall be deemed or
shall  constitute  a waiver  of any  other  provisions  hereof  (whether  or not
similar),  nor  shall  any  waiver  constitute  a  continuing  waiver  unless so
expressly provided.  Tri-County's Board of Directors may authorize the amendment
or  supplementation  of this  Agreement  or  waiver of any  provision  hereof or
thereof,  either before or after the approval of Tri-County's  shareholders (and
without  seeking  further  shareholder  approval),  so long  as such  amendment,
supplement or waiver does not result in the reduction of the consideration given
or result in an adverse tax or other effect to Tri-County's shareholders.

      6.13  Controlling Law.  This Agreement shall be construed in accordance
with the laws of the State of Colorado, except to the extent that federal law
is applicable.

      6.14 Counterparts. This Agreement may be executed in any number of copies,
each of which shall be deemed an original,  and all of which  together  shall be
deemed one and the same instrument.

      IN WITNESS  WHEREOF,  pursuant to authority  duly given by the  respective
Boards of Directors of Platte Valley,  Platte Valley National Bank,  Tri-County,
Tri-County  Bank and AcqCo,  this  Agreement  has been  signed on behalf of said
corporations by their  respective  Presidents or Vice Presidents and attested by
their  respective  Secretaries or Assistant  Secretaries,  all on the date first
written above.  The signature of a Secretary or Assistant  Secretary is intended
not only as an execution hereof,  but also is a certification that such parties'
Board of  Directors  has duly  authorized  the  execution  and  delivery of this
Agreement.

                                 PLATTE VALLEY FINANCIAL SERVICE
                                 COMPANIES, INC.


Attest:/s/                            By:/s/H. Hod Kosman, President and CEO


                               PLATTE VALLEY NATIONAL BANK,
                               Torrington, Wyoming


Attest:/s/                             By:/s/H. Hod Kosman, Chairman

                               TRI-COUNTY BANCORP, INC.


Attest:/s/                             By:/s/Robert L. Savage, President and CEO

                               TRI-COUNTY BANK


Attest:/s/                             By:/s/Robert L. Savage, President and CEO

                                    PLATTE VALLEY ACQUISITION COMPANY
                                    (In Organization)


Attest:/s/                              By:/s/H. Hod Kosman, President and CEO