STOCK OPTION AGREEMENT
     
This  Stock Option Agreement ("Agreement"), dated as of  November
10,  1998, is between UNITED SECURITY BANCORPORATION ("USBN") and
BANCWEST FINANCIAL CORPORATION ("Bancwest").
     
                               RECITALS
     
Bancwest  and USBN have executed an Agreement and Plan of  Merger
("Plan"), of even date with this Agreement, under which  Bancwest
will  merge with and into USBN, and Bank of the West, the  wholly
owned   subsidiary  of  Bancwest,  will  become  a  wholly  owned
subsidiary  of  USBN  upon completion of  the  merger  ("Merger")
contemplated in the Plan.
     
By  negotiating  and  executing the Plan and  by  taking  actions
necessary  or appropriate to effect the transactions contemplated
by  the Plan, USBN has incurred and will incur substantial direct
and  indirect costs (including, without limitation, the costs  of
management  and  employee time) and will  forgo  the  pursuit  of
certain alternative investments and transactions.
     
                            AGREEMENT
     
THEREFORE,  in  consideration of the promises set forth  in  this
Agreement and in the Plan, the parties agree as follows:

1.   Grant  of  Option.  Subject to the terms and conditions  set
forth  in  this Agreement, Bancwest irrevocably grants an  option
("Option")  to USBN to purchase an aggregate of 90,502 authorized
but  unissued shares of Bancwest's capital stock ("Common Stock")
(which if issued, and assuming exercise of outstanding options to
acquire the Common Stock, would represent approximately 19.9%  of
total  stock  issued and outstanding), at a per  share  price  of
$45.00 ("Option Price").

2.   Exercise  of  Option.   Subject to the  provisions  of  this
Section 02 and of Section 0130 of this Agreement, this Option may
be exercised by USBN or any transferee as set forth in Section 05
of this Agreement, in whole or in part, at any time, or from time
to time in any of the following circumstances:

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

b.   any  Person (other than USBN or any of its subsidiaries  and
other       than any Person beneficially owning as of the date of
this  Agreement 10% or more of Bancwest's voting shares) acquires
the  beneficial  ownership  or the right  to  acquire  beneficial
ownership  of securities which, when aggregated with  other  such
securities  owned by such Person, represents 10% or more  of  the
voting  shares  of Bancwest (the term "beneficial ownership"  for
purposes  of this Agreement has the meaning set forth in  Section
13(d)  of the Exchange Act, and the regulations promulgated under
the Exchange Act); notwithstanding the foregoing, the Option will
not be exercisable in the circumstances described
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above  in  this subsection 20 if a Person acquires the beneficial
ownership  of securities which, when aggregated with  other  such
securities owned by such Person, represents 10% or more, but less
than  25%,  of Bancwest's voting shares and the transaction  does
not  result  in, and is not presumed to constitute, "control"  as
defined  under Section 7(j) of the Federal Deposit Insurance  Act
or 12 CFR Part 303.4; or

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

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

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

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

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



                              2



5.   Transferability of the Option and Option Shares.  Before the
Option,  or  a  portion  of the Option,  becomes  exercisable  in
accordance  with the provisions of Section 02 of this  Agreement,
neither  the  Option  nor  any portion  of  the  Option  will  be
transferable.  If any of the events or circumstances set forth in
Sections  020  through 0 above occur, USBN may  freely  transfer,
subject  to  applicable federal and state  securities  laws,  the
Option or any portion of the Option, or any of the Option Shares.

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

6.    Representations,  Warranties  and  Covenants  of  Bancwest.
Bancwest represents and warrants to USBN as follows:

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

b.   Option  Shares.  Bancwest has taken all necessary  corporate
and  other  action to authorize and reserve and to permit  it  to
issue  and, at all times from the date of this Agreement to  such
time  as  the  obligation to deliver shares under this  Agreement
terminates,  will have reserved for issuance, at  the  closing(s)
upon  exercise of the Option, or any portion of the  Option,  the
Option  Shares (subject to adjustment, as provided in Section  08
below), all of which, upon issuance under this Agreement, will be
duly  and validly issued, fully paid and nonassessable, and  will
be  delivered  free and clear of all claims, liens,  encumbrances
and security interests, including any preemptive right of any  of
the shareholders of Bancwest.

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

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

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7.   Representations,  Warranties and Covenants  of  USBN.   USBN
represents and warrants to Bancwest as follows:

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

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

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

8.   Adjustment Upon Changes in Capitalization.  In the event  of
any  change  in  the Common Stock by reason of  stock  dividends,
split-ups,     mergers,    reorganizations,    recapitalizations,
combinations,  exchanges of shares or the like,  the  number  and
kind  of  shares  or  securities subject to the  Option  and  the
purchase  price  per share of Common Stock will be  appropriately
adjusted.   If,  before the Option terminates  or  is  exercised,
Bancwest  is  acquired  by another party,  consolidates  with  or
merges  into  another  corporation or  liquidates,  USBN  or  any
transferee will thereafter receive, upon exercise of the  Option,
the  securities or properties to which a holder of the number  of
shares of Common Stock then deliverable upon the exercise thereof
would  have  been entitled upon such acquisition,  consolidation,
merger, reorganization or liquidation, and Bancwest will take all
steps in connection with such acquisition, consolidation, merger,
reorganization or liquidation as may be necessary to assure  that
the  provisions of this Agreement will thereafter be  applicable,
as  nearly as reasonably may be practicable, in relation  to  any
securities  or property thereafter deliverable upon  exercise  of
the Option.

9.   Nonassignability.  This Agreement binds and  inures  to  the
benefit  of the parties and their successors.  This Agreement  is
not assignable by either party, but USBN may transfer the Option,
the  Option Shares or any portion of the Option or Option  Shares
in  accordance  with  Section 05.  A  merger,  reorganization  or
consolidation  of  USBN  (whether or not USBN  is  the  surviving
entity)  or  an  acquisition  of  USBN  will  not  be  deemed  an
assignment or transfer.

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

11.   Remedies.  Bancwest agrees that if for any reason  USBN  or
any   transferee  will  have  exercised  its  rights  under  this
Agreement  and  Bancwest will have failed  to  issue  the  Option
Shares  to  be issued upon such exercise or to perform its  other
obligations under this Agreement, unless such action

                                  4



would  violate any applicable law or regulation by which Bancwest
is  bound,  then  USBN  or any transferee  will  be  entitled  to
specific  performance and injunctive and other equitable  relief.
USBN  agrees  that if it fails to perform any of its  obligations
under  this Agreement, then Bancwest will be entitled to specific
performance  and  injunctive and other  equitable  relief.   This
provision is without prejudice to any other rights that  Bancwest
or  USBN  or any transferee may have against the other party  for
any failure to perform its obligations under this Agreement.

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



13.  Miscellaneous.

a.   Termination.  This Agreement and the Option, to  the  extent
not previously exercised, will terminate upon the earliest of (1)
December  31,  1999; (2) the mutual agreement of the  parties  to
this  Agreement;  (3)  31  days  after  the  date  on  which  any
application  for  regulatory approval for  the  Merger  has  been
denied,  but  if  before  the expiration of  the  31-day  period,
Bancwest  or USBN is engaged in litigation or an appeal procedure
relating  to  an attempt to obtain approval of the  Merger,  this
Agreement will not terminate until the later of (i) December  31,
1999, or (ii) 31 days after the completion of the litigation  and
appeal  procedure; (4) the 30th day following the termination  of
the  Plan  for any reason other than a material noncompliance  or
default by USBN with respect to its obligations under it; or  (5)
the date of termination of the Plan if the termination is due  to
a  material noncompliance or default by USBN with respect to  its
obligations  under  it;  but  if the Option  becomes  exercisable
pursuant to Section 2 of this Agreement before the termination of
this  Agreement,  then  the exercise will  promptly  close  under
Section  04 of this Agreement, even though that closing  date  is
after  the  termination of this Agreement; and if the  Option  is
transferred  pursuant to Section 5 of this Agreement  before  the
termination of this Agreement, the Option may be exercised by the
transferee  at  any  time  within  31  days  after  the  date  of
termination  even  though such exercise or the  closing  of  such
exercise occurs after the termination of this Agreement.

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

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

                                 5
     

transferee may, nevertheless, exercise the Option to the  fullest
extent permissible.

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

     
If to Bancwest to:

Bancwest Financial Corporation
P.O. Box 1597
Walla Walla, Washington 99362
Attn: Wes E. Colley



With a copy to:

Glen P. Garrison
Keller Rohrback LLP
1201 Third Avenue, Suite 3200
Seattle, Washington 98101-3052


If to USBN, to:

United Security Bancorporation
N. 9506 Newport Hwy
Spokane, Washington 99218
Attn: William C. Dashiell and Richard C. Emery


With a copy to:

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


a.   Governing Law and Venue.  The parties intend this  Agreement
and  the  Option,  in  all  respects, including  all  matters  of
construction,  validity and performance, to be  governed  by  the
laws  of  the  State  of  Washington, without  giving  effect  to
conflicts of law principles.  Any actions brought by either party
against  the other arising under this Agreement must be filed  in
Spokane  County, Washington, and each party consents to  personal
jurisdiction in Spokane County.

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

c.   Effects of Headings.  The section headings in this Agreement
are  for  convenience only and do not affect the meaning  of  its
provisions.
                                   6



Dated November 10, 1998:

UNITED SECURITY BANCORPORATION

By: /s/ William C. Dashiell
     William C. Dashiell
Its: Chairman


By: /s/ Richard C. Emery
     Richard C. Emery
Its: President and Chief Executive Officer


BANCWEST FINANCIAL CORPORATION

By: /s/ Wes E. Colley
     Wes E. Colley
      Its: Chairman and President

                                   7