BANCWEST CORP/HI
S-4 POS, 1999-07-01
STATE COMMERCIAL BANKS
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      As filed with the Securities and Exchange Commission on July 1, 1999.

                                                 Registration No. 333-76271
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                         POST-EFFECTIVE AMENDMENT NO. 1
                                       ON
                                    FORM S-8
                                       TO
                                    FORM S-4
                             REGISTRATION STATEMENT
                                      Under
                           THE SECURITIES ACT OF 1933

                              BANCWEST CORPORATION
             (Exact name of registrant as specified in its charter)


            Delaware                                     99-0156159
- -------------------------------------        ----------------------------------
 (State or other jurisdiction of                      (I.R.S. Employer
 incorporation or organization)                      Identification No.)

        999 Bishop Street
        Honolulu, Hawaii                                    96813
- -------------------------------------        ----------------------------------
      (Address of Principal                              (Zip Code)
       Executive Offices)

                   SIERRA TAHOE BANCORP 1996 STOCK OPTION PLAN

                   SIERRA TAHOE BANCORP 1998 STOCK OPTION PLAN

       CALIFORNIA COMMUNITY BANCSHARES CORPORATION 1993 STOCK OPTION PLAN

             CONTINENTAL PACIFIC BANK 1990 AMENDED STOCK OPTION PLAN

     SIERRAWEST BANCORP DIRECTORS DEFERRED COMPENSATION AND STOCK AWARD PLAN

                            (Full title of the plan)

                                                            Copy to:
        WILLIAM E. ATWATER, ESQ.
Senior Vice President and General Counsel             RODNEY R. PECK, ESQ.
          BancWest Corporation                    Pillsbury Madison & Sutro LLP
            999 Bishop Street                             P.O. Box 7880
            Honolulu, Hawaii                         San Francisco, CA 94120
             (808) 525-7000                              (415) 983-1000
     ------------------------------              ------------------------------
      (Name, address and telephone
      number, including area code,
          of agent for service)


<PAGE>

<TABLE>
<CAPTION>

                                         CALCULATION OF REGISTRATION FEE
- ------------------------------------------------------------------------------------------------------------------------------

     Title of                      Amount                 Proposed Maximum              Proposed                    Amount of
   Securities To                    To Be                  Offering Price           Maximum Aggregate             Registration
   Be Registered                 Registered                   per Share              Offering Price                    Fee
- ------------------------------------------------------------------------------------------------------------------------------

<S>                              <C>                          <C>                   <C>                            <C>

Sierra Tahoe Bancorp 1996 Stock Option Plan
   Common Stock                  138,535 (2)                  (1)                   (1)                             (1)

Sierra Tahoe Bancorp 1988 Stock Option Plan
   Common Stock                  123,185 (2)                  (1)                   (1)                             (1)

California Community Bancshares Corporation 1993 Stock Option Plan
   Common Stock                  21,156 (2)                   (1)                   (1)                             (1)

Continental Pacific Bank 1990 Amended Stock Option Plan
   Common Stock                   4,629 (2)                   (1)                   (1)                             (1)

SierraWest Bancorp Directors Deferred Compensation and Stock Award Plan
   Common Stock                  10,000 (2)               $38.34 (3)            $383,400 (3)                    $106.59 (3)

(1) Not applicable.  All filing fees payable in connection with the registration of these  securities  were paid with the initial
filing with the Securities and Exchange Commission of the Registration  Statement on Form S-4 (Registration No. 333-27671), filed on
April  14,  1999,  being  amended  by this  post-effective amendment.

(2) There is also being registered hereunder such additional undetermined number of shares of the Registrant's Common Stock as
may be  required as a result of stock dividends,  stock splits, or other similar adjustments of the Registrant's outstanding Common
Stock.

(3) Estimated in accordance  with Rule 457(h) and Rule 457(c) of the  Securities Act of 1933  solely for the purpose of calculating
the registration fee as follows: $383,400 or 10,000 shares of Common Stock based on a price of $38.34 per share, the average of the
high and low trading prices of the Common Stock of the Registrant on the consolidated reporting system on June 25, 1999.

</TABLE>


        INTRODUCTORY STATEMENT NOT FORMING PART OF REGISTRATION STATEMENT

     BancWest Corporation ("Registrant") hereby amends its Registration
Statement on Form S-4 (Registration No. 333-76271) filed on April 14, 1999, by
filing this Post-Effective Amendment No. 1 on Form S-8 relating to an aggregate
of 297,505 shares of Common Stock of the Registrant (the "Shares"). The Shares
to be registered hereunder are issuable by the Registrant pursuant to options or
obligations to issue shares assumed by the Registrant pursuant to an Amended and
Restated Agreement and Plan of Merger, dated as of February 25, 1999 (the
"Agreement"), among the Registrant, Bank of the West and SierraWest Bancorp.
Such options or obligations were originally granted under (i) the Sierra Tahoe
Bancorp 1996 Stock Option Plan, (ii) the Sierra Tahoe Bancorp 1998 Stock Option
Plan, (iii) the California Community Bancshares Corporation 1993 Stock Option
Plan, as amended and restated March 19, 1996, (iv) the Continental Pacific Bank
1990 Amended Stock Option Plan, and (v) the SierraWest Bancorp Directors
Deferred Compensation and Stock Award Plan (the "Directors Plan"), each as
amended to date (collectively, the "Plans"). Pursuant to the Agreement,
SierraWest Bancorp will be merged (the "Merger") with and into Bank of the West,
a wholly-owned subsidiary of the Registrant. Options to purchase SierraWest
Bancorp Common Stock granted under the Plans and outstanding immediately prior
to the completion of the Merger shall become options to purchase the Common
Stock of the Registrant at the effective time of the Merger and any obligations
to issue shares of the Common Stock of SierraWest Bancorp to any directors shall
become obligations to issue shares of the Common Stock of the Registrant.


                                       -2-


<PAGE>



         Pursuant  to  its  Registration   Statement  on  Form  S-4,  Registrant
registered  4,624,004  shares of its Common  Stock,  representing  the number of
shares of its Common Stock issuable in connection with the Agreement in exchange
for SierraWest  Bancorp Common Stock,  assuming exercise of all then outstanding
options to purchase  SierraWest  Bancorp Common Stock.  The  designation of this
Post-Effective  Amendment No. 1 as Registration No. 333-76271  denotes that this
Post-Effective Amendment No. 1 relates only to an aggregate of 297,505 shares of
Common Stock of the Registrant issuable to any director under the Directors Plan
or issuable upon  conversion of options granted under the Plans listed above and
that this is the first post-effective amendment to the Form S-4.


                                     PART I
                                     ------

              INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS
              ----------------------------------------------------

     The document(s) containing the information specified in Part I of Form
S-8 will be provided to participants as specified by Rule 428(b)(1) of the
Securities Act of 1933, as amended (the "Securities Act"). These documents and
the documents incorporated herein by reference pursuant to Item 3 of Part II of
this Registration Statement, taken together, constitute a prospectus that meets
the requirements of Section 10(a) of the Securities Act (the "Prospectus").

                                     PART II
                                     -------

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
               --------------------------------------------------

Item 3.  Incorporation of Certain Documents by Reference.
- -------  ------------------------------------------------

     The following documents filed by Registrant with the Securities and
Exchange Commission are incorporated by reference in this Registration
Statement:

     (1) The Registrant's Annual Report on Form 10-K for the fiscal year
ended December 31, 1998;

     (2) The Registrant's Quarterly Report on Form 10-Q for the quarter
ending March 31, 1999;

     (3) All other reports of the Registrant pursuant to Section 13(a) or
15(d) of the Securities Exchange Act of 1934 (the "Exchange Act") since December
31, 1998;

     (4) The description of the Registrant's Common Stock contained in the
Registration Statement (and past and future amendments thereto, including
without limitation the Registrant's Form 8-A filed on October 30, 1998) for such
stock filed under Section 12 of the Exchange Act.

     In addition, all documents subsequently filed by the Registrant
pursuant to Section 13(a), 13(c), 14 and 15(d) of the Securities Exchange Act
of 1934, prior to the filing of a post-effective amendment which indicates that
all securities offered have been sold or which deregisters all securities then
remaining unsold, shall be deemed to be incorporated by reference in this
registration statement and to be a part hereof from the date of filing of such
documents.

     Any statement contained in a document incorporated or deemed to be
incorporated by reference herein shall be deemed to be modified or superseded
for purposes of this Registration Statement to the extent that a statement
contained herein or in any other subsequently filed document which also is or is
deemed to be incorporated by reference herein modifies or supersedes such
statement. Any such statement so modified or superseded shall not be deemed,
except as so modified or superseded, to constitute a part of this Registration
Statement.


                                       -3-


<PAGE>



Item 4.     Description of Securities.
- -------     --------------------------

         Not applicable.

Item 5.     Interests of Named Experts and Counsel.
- -------     ---------------------------------------

         Not applicable.

Item 6.     Indemnification of Directors and Officers.
- -------     ------------------------------------------

         The Registrant is incorporated under the laws of Delaware. Section 145
of the Delaware General Corporation Law provides for the indemnification of
officers and directors of a Delaware corporation under certain circumstances
against expenses, judgments, and the like in connection with an action, suit, or
proceeding. Article X of the Registrant's Amended and Restated Bylaws provides
for indemnification of directors and officers under certain circumstances. The
Registrant has purchased a standard liability policy, which, subject to any
limitations set forth in the policy, indemnifies the Registrant's directors and
officers for damages that they become legally obligated to pay as a result of
any negligent act, error, or omission committed while serving in their official
capacity. Banque Nationale de Paris, the holder of 100% of the Class A Common
Stock of the Registrant, has agreed to indemnify the persons who serve as Class
A Directors of the Registrant (who are elected by the holder of the Class A
Common Stock) under certain circumstances against expenses, judgments, and the
like in connection with an action, suit, or proceeding by reason of the fact
that the person is or was a Class A Directors.

Item 7.    Exemptions from Registration Claimed.
- -------    -------------------------------------

         Not applicable.

Item 8.    Exhibits.
- ------     ---------

5.1        Opinion of Pillsbury Madison & Sutro LLP.

23.1       Consent of PricewaterhouseCoopers LLP, Independent Auditors.

23.2       Consent of Pillsbury Madison & Sutro LLP (included in Exhibit 5.1).

24.1-24.20 Powers of Attorney

Item 9.    Undertakings.
- -------    -------------

         (a)  The undersigned Registrant hereby undertakes:

              (1) To file, during any period in which offers or sales are
         being made, a post-effective amendment to this Registration Statement:

                  (i) To include any prospectus required by section 10(a)(3)
               of the Securities Act of 1933;

                  (ii) To reflect in the prospectus any facts or events
               arising after the effective date of the registration statement
               (or the most recent post-effective amendment thereof) which,
               individually or in the aggregate, represent a fundamental
               change in the information set forth in the registration
               statement. Notwithstanding the foregoing, any increase or
               decrease in volume of securities offered (if the total dollar
               value of securities offered would not exceed that which was
               registered) and any deviation from the low or high end of the
               estimated maximum offering range may be

                                       -4-


<PAGE>



              reflected in the form of prospectus filed with the Commission
              pursuant to Rule 424(b) if, in the aggregate, the changes in
              volume and price represent no more than a 20% change in the
              maximum aggregate offering price set forth in the "Calculation
              of Registration Fee" table in the effective registration
              statement;

                  (iii) To include any material information with
              respect to the plan of distribution not previously disclosed
              in the registration statement or any material change to such
              information in the registration statement;

     Provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not
     apply if the registration statement is on Form S-3 or Form S-8, and the
     information required to be included in a post-effective amendment by
     those paragraphs is contained in periodic reports filed by the
     Registrant pursuant to section 13 or section 15(d) of the Securities
     Exchange Act of 1934 that are incorporated by reference in the
     registration statement.

         (2) That, for the purpose of determining any liability under
     the Securities Act of 1933, each such post-effective amendment shall be
     deemed to be a new registration statement relating to the securities
     offered therein, and the offering of such securities at that time shall
     be deemed to be the initial bona fide offering thereof.

         (3) To remove from registration by means of a post-effective
     amendment any of the securities being registered which remain unsold at
     the termination of the offering.

     (b) The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
Registrant's annual report pursuant to section 13(a) or section 15(d) of the
Securities Exchange Act of 1934 that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

     (c) Insofar as indemnification for liabilities arising under the
Securities Act of 1933 may be permitted to directors, officers and controlling
persons of the Registrant pursuant to the foregoing provisions, or otherwise,
the Registrant has been advised that in the opinion of the Securities and
Exchange Commission such indemnification is against public policy as expressed
in the Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.


                                       -5-


<PAGE>



                                   SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, the
Registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-8 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Honolulu, State of Hawaii, on June 30, 1999.

                               BANCWEST CORPORATION


                               By    /s/ HOWARD H. KARR
                                 --------------------------------------
                                   Name:   Howard H. Karr
                                   Title:  Executive Vice President and
                                           Chief Financial Officer

      Pursuant to the requirements of the Securities Act of 1933, as amended,
this registration statement has been signed on June 30, 1999, by or on the
behalf of the following persons in the capacities indicated with the registrant.

        Signature                                    Title
        ---------                                    -----


               *                       Chairman, Chief Executive Officer and
- -----------------------------------
        Walter A. Dods, Jr.            Director (Principal Executive Officer)


        /s/  HOWARD H. KARR            Executive Vice President and Chief
- -----------------------------------    Financial Officer (Principal Financial
        Howard H. Karr                 and Accounting Officer)



               *                       Director
- ----------------------------------
        Jacques Ardant


               *                      Director
- ----------------------------------
        John W. A. Buyers


               *                      Director
- ----------------------------------
        Dr. Julia Ann Frohlich


               *                      Director
- ----------------------------------
        Robert A. Fuhrman


               *                      Director
- ----------------------------------
        Paul Mullin Ganley


               *                      Director
- ----------------------------------
        David M. Haig



                                       -6-


<PAGE>


        Signature                          Title
        ---------                          -----

            *                             Director
- ----------------------------------
        John A. Hoag


            *                             Director
- ----------------------------------
        Bert T. Kobayashi, Jr.


            *                             Director
- ----------------------------------
        Michel Larrouilh


            *                             Director
- ----------------------------------
        Vivien Levy-Garboua


            *                             Director
- ----------------------------------
        Yves Martrenchar


            *                             Director
- ----------------------------------
        Dr. Fujio Matsuda


            *                             Director
- ----------------------------------
        Don J. McGrath


            *                             Director
- ----------------------------------
        Rodney R. Peck


            *                             Director
- ----------------------------------
        Joel Sibrac


            *                             Director
- ----------------------------------
        John K. Tsui


            *                             Director
- ----------------------------------
        Jacques Henri Wahl


            *                             Director
- ----------------------------------
        Fred C. Weyand


            *                             Director
- ----------------------------------
        Robert C. Wo

* By Power of Attorney


                                       -7-


<PAGE>


           Signature                       Title
           ---------                       -----


      /s/  HOWARD H. KARR                 Attorney-in-Fact
- ------------------------------------
           Howard H. Karr

                                       -8-


<PAGE>

INDEX TO EXHIBITS
- -----------------


Exhibit
- -------
Number                        Exhibit
- -----                         -------

 5.1           Opinion of Pillsbury Madison & Sutro LLP.

23.1           Consent of PricewaterhouseCoopers LLP, Independent Auditors.

23.2           Consent of Pillsbury Madison & Sutro LLP (included in
               Exhibit 5.1).

24.1-24.20     Powers of Attorney

                                       -9-





                                                                    EXHIBIT 5.1

                          PILLSBURY MADISON & SUTRO LLP
                              235 Montgomery Street
                             San Francisco, CA 94104
                               Tel: (415) 983-1000


                                  July 1, 1999




BancWest Corporation
999 Bishop Street
Honolulu, HI 96813


         Re:      Registration Statement on Form S-8


Ladies and Gentlemen:

     We refer to the Registration Statement on Form S-8 (the "Registration
Statement") to be filed by BancWest Corporation, a Delaware corporation (the
"Registrant"), with the Securities and Exchange Commission under the Securities
Act of 1933, as amended, relating to 297,505 shares of Common Stock of the
Registrant (the "Shares") issuable upon the exercise of options originally
granted by SierraWest Bancorp ("SierraWest") or granted pursuant to the
SierraWest Bancorp Directors Deferred Compensation and Stock Award Plan (the
"Directors Plan"). The Shares to be registered hereunder are issuable by the
Registrant pursuant to obligations or options assumed by the Registrant pursuant
to an Amended and Restated Agreement and Plan of Merger, dated as of February
25, 1999, among the Registrant, Bank of the West and SierraWest Bancorp. Such
options and shares were originally granted under (i) the Sierra Tahoe Bancorp
1996 Stock Option Plan, (ii) the Sierra Tahoe Bancorp 1998 Stock Option Plan,
(iii) the California Community Bancshares Corporation 1993 Stock Option Plan, as
amended and restated March 19, 1996, (iv) the Continental Pacific Bank 1990
Amended Stock Option Plan, and (v) the Directors Plan, each as amended to date
(collectively, the "Plans"). We advise you that, in our opinion, such Shares,
when granted pursuant to the Directors Plan or when issued and sold in
accordance with the Plans and, where applicable, with option agreements duly
authorized under the Plans and in accordance with the Registration Statement,
will be legally issued, fully paid and nonassessable.

     We hereby consent to the filing of this opinion with the Securities and
Exchange Commission as Exhibit 5.1 to the Registration Statement.

     This opinion letter is rendered as of the date first written above and
we disclaim any obligation to advise you of facts, circumstances, events or
developments which hereafter may be brought to our attention and which may
alter, affect or modify the opinion expressed herein. Our opinion is expressly
limited to the matters set forth above and we render no opinion, whether by
implication or otherwise, as to any other matters relating to the Registrant,
the Plans or the Shares.

                                Very truly yours,


                                /s/ PILLSBURY MADISON & SUTRO LLP





                                                                   EXHIBIT 23.3



                       CONSENT OF INDEPENDENT ACCOUNTANTS


We hereby consent to the incorporation by reference in this Registration
Statement on Form S-8 (to be filed on or about July 1, 1999) of our report
dated January 21, 1999 relating to the consolidated financial statements,
which appears in the 1998 Annual Report to Shareholders of BancWest
Corporation, which is incorporated by reference in BancWest Corporation's
Annual Report on Form 10-K for the year ended December 31, 1998.

                                /s/  PRICEWATERHOUSECOOPERS LLP

Honolulu, Hawaii
July 1, 1999





                                                                   EXHIBIT 24.1


                                POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned, being an officer
or director, or both, of BANCWEST CORPORATION (the "Issuer"), in his capacity as
set forth below, hereby constitutes and appoints WALTER A. DODS, JR. AND HOWARD
H. KARR, of Honolulu, Hawaii, and DON J. MCGRATH, of San Francisco, California,
and each of them, his true and lawful attorney and agent, to do any and all acts
and all things and to execute any and all instruments which said attorney and
agent may deem necessary or desirable to enable the Issuer to comply with the
Securities Act of 1933, as amended (the "Act"), and any rules, regulations and
requirements of the Securities and Exchange Commission thereunder, in connection
with the registration under the Act of such number of shares of common stock of
the Issuer (the "Shares") as are necessary at the Effective Time to satisfy the
Issuer's obligations arising under Section 2.6 of the Amended and Restated
Agreement and Plan of Merger dated as of February 25, 1999 among the Issuer,
Bank of the West and SierraWest Bancorp including, without limitation, the power
and authority to sign the name of the undersigned in the capacity indicated
below to the Registration Statement on Form S-8 to be filed with the Securities
and Exchange Commission with respect to such Shares, to any and all amendments
or supplements to such Registration Statement, whether such amendments or
supplements are filed before or after the effective date of such Registration
Statement, to any related Registration Statement filed pursuant to Rule 462
under the Act, and to any and all instruments or documents filed as part of or
in connection with such Registration Statement or any and all amendments
thereto, whether such amendments are filed before or after the effective date of
such Registration Statement; and the undersigned hereby ratifies and confirms
all that such attorney and agent shall do or cause to be done by virtue hereof.

     Date:  June 10, 1999.

                                    /s/  WALTER A. DODS, JR.
                                    ------------------------------------
                                    Walter A. Dods, Jr.
                                    Chairman, Chief Executive Officer and
                                    Director (Principal Executive Officer)


<PAGE>



                                                                   EXHIBIT 24.2


                                POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned, being an officer
or director, or both, of BANCWEST CORPORATION (the "Issuer"), in his capacity as
set forth below, hereby constitutes and appoints WALTER A. DODS, JR. AND HOWARD
H. KARR, of Honolulu, Hawaii, and DON J. MCGRATH, of San Francisco, California,
and each of them, his true and lawful attorney and agent, to do any and all acts
and all things and to execute any and all instruments which said attorney and
agent may deem necessary or desirable to enable the Issuer to comply with the
Securities Act of 1933, as amended (the "Act"), and any rules, regulations and
requirements of the Securities and Exchange Commission thereunder, in connection
with the registration under the Act of such number of shares of common stock of
the Issuer (the "Shares") as are necessary at the Effective Time to satisfy the
Issuer's obligations arising under Section 2.6 of the Amended and Restated
Agreement and Plan of Merger dated as of February 25, 1999 among the Issuer,
Bank of the West and SierraWest Bancorp including, without limitation, the power
and authority to sign the name of the undersigned in the capacity indicated
below to the Registration Statement on Form S-8 to be filed with the Securities
and Exchange Commission with respect to such Shares, to any and all amendments
or supplements to such Registration Statement, whether such amendments or
supplements are filed before or after the effective date of such Registration
Statement, to any related Registration Statement filed pursuant to Rule 462
under the Act, and to any and all instruments or documents filed as part of or
in connection with such Registration Statement or any and all amendments
thereto, whether such amendments are filed before or after the effective date of
such Registration Statement; and the undersigned hereby ratifies and confirms
all that such attorney and agent shall do or cause to be done by virtue hereof.

     Date: June 23, 1999.

                                 /s/  JACQUES ARDANT
                                 ---------------------------------
                                 Jacques Ardant
                                    Director


<PAGE>



                                                                   EXHIBIT 24.3


                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS, that the undersigned,  being an officer
or director, or both, of BANCWEST CORPORATION (the "Issuer"), in his capacity as
set forth below,  hereby constitutes and appoints WALTER A. DODS, JR. AND HOWARD
H. KARR, of Honolulu, Hawaii, and DON J. MCGRATH, of San Francisco,  California,
and each of them, his true and lawful attorney and agent, to do any and all acts
and all things and to execute any and all  instruments  which said  attorney and
agent may deem  necessary  or  desirable to enable the Issuer to comply with the
Securities Act of 1933, as amended (the "Act"),  and any rules,  regulations and
requirements of the Securities and Exchange Commission thereunder, in connection
with the registration  under the Act of such number of shares of common stock of
the Issuer (the  "Shares") as are necessary at the Effective Time to satisfy the
Issuer's  obligations  arising  under  Section 2.6 of the  Amended and  Restated
Agreement  and Plan of Merger  dated as of  February  25, 1999 among the Issuer,
Bank of the West and SierraWest Bancorp including, without limitation, the power
and  authority to sign the name of the  undersigned  in the  capacity  indicated
below to the Registration  Statement on Form S-8 to be filed with the Securities
and Exchange  Commission with respect to such Shares,  to any and all amendments
or  supplements  to such  Registration  Statement,  whether such  amendments  or
supplements  are filed before or after the effective  date of such  Registration
Statement,  to any related  Registration  Statement  filed  pursuant to Rule 462
under the Act, and to any and all  instruments or documents  filed as part of or
in  connection  with  such  Registration  Statement  or any and  all  amendments
thereto, whether such amendments are filed before or after the effective date of
such Registration  Statement;  and the undersigned  hereby ratifies and confirms
all that such attorney and agent shall do or cause to be done by virtue hereof.

         Date:  June 17, 1999.

                                   /s/  JOHN W. A. BUYERS
                                   -------------------------------------
                                   John W. A. Buyers
                                   Director


<PAGE>



                                                                   EXHIBIT 24.4


                                POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned, being an officer
or director, or both, of BANCWEST CORPORATION (the "Issuer"), in his capacity as
set forth below, hereby constitutes and appoints WALTER A. DODS, JR. AND HOWARD
H. KARR, of Honolulu, Hawaii, and DON J. MCGRATH, of San Francisco, California,
and each of them, his true and lawful attorney and agent, to do any and all acts
and all things and to execute any and all instruments which said attorney and
agent may deem necessary or desirable to enable the Issuer to comply with the
Securities Act of 1933, as amended (the "Act"), and any rules, regulations and
requirements of the Securities and Exchange Commission thereunder, in connection
with the registration under the Act of such number of shares of common stock of
the Issuer (the "Shares") as are necessary at the Effective Time to satisfy the
Issuer's obligations arising under Section 2.6 of the Amended and Restated
Agreement and Plan of Merger dated as of February 25, 1999 among the Issuer,
Bank of the West and SierraWest Bancorp including, without limitation, the power
and authority to sign the name of the undersigned in the capacity indicated
below to the Registration Statement on Form S-8 to be filed with the Securities
and Exchange Commission with respect to such Shares, to any and all amendments
or supplements to such Registration Statement, whether such amendments or
supplements are filed before or after the effective date of such Registration
Statement, to any related Registration Statement filed pursuant to Rule 462
under the Act, and to any and all instruments or documents filed as part of or
in connection with such Registration Statement or any and all amendments
thereto, whether such amendments are filed before or after the effective date of
such Registration Statement; and the undersigned hereby ratifies and confirms
all that such attorney and agent shall do or cause to be done by virtue hereof.

     Date: June 15, 1999.

                                    /s/  DR. JULIA ANN FROHLICH
                                    ---------------------------------------
                                    Dr.Julia Ann Frohlich
                                    Director


<PAGE>



                                                                   EXHIBIT 24.5


                                POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned, being an officer
or director, or both, of BANCWEST CORPORATION (the "Issuer"), in his capacity as
set forth below, hereby constitutes and appoints WALTER A. DODS, JR. AND HOWARD
H. KARR, of Honolulu, Hawaii, and DON J. MCGRATH, of San Francisco, California,
and each of them, his true and lawful attorney and agent, to do any and all acts
and all things and to execute any and all instruments which said attorney and
agent may deem necessary or desirable to enable the Issuer to comply with the
Securities Act of 1933, as amended (the "Act"), and any rules, regulations and
requirements of the Securities and Exchange Commission thereunder, in connection
with the registration under the Act of such number of shares of common stock of
the Issuer (the "Shares") as are necessary at the Effective Time to satisfy the
Issuer's obligations arising under Section 2.6 of the Amended and Restated
Agreement and Plan of Merger dated as of February 25, 1999 among the Issuer,
Bank of the West and SierraWest Bancorp including, without limitation, the power
and authority to sign the name of the undersigned in the capacity indicated
below to the Registration Statement on Form S-8 to be filed with the Securities
and Exchange Commission with respect to such Shares, to any and all amendments
or supplements to such Registration Statement, whether such amendments or
supplements are filed before or after the effective date of such Registration
Statement, to any related Registration Statement filed pursuant to Rule 462
under the Act, and to any and all instruments or documents filed as part of or
in connection with such Registration Statement or any and all amendments
thereto, whether such amendments are filed before or after the effective date of
such Registration Statement; and the undersigned hereby ratifies and confirms
all that such attorney and agent shall do or cause to be done by virtue hereof.

     Date: June 12, 1999.

                                    /s/  ROBERT A. FUHRMAN
                                    ------------------------------------
                                    Robert A. Fuhrman
                                    Director


<PAGE>



                                                                   EXHIBIT 24.6


                                POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned, being an officer
or director, or both, of BANCWEST CORPORATION (the "Issuer"), in his capacity as
set forth below, hereby constitutes and appoints WALTER A. DODS, JR. AND HOWARD
H. KARR, of Honolulu, Hawaii, and DON J. MCGRATH, of San Francisco, California,
and each of them, his true and lawful attorney and agent, to do any and all acts
and all things and to execute any and all instruments which said attorney and
agent may deem necessary or desirable to enable the Issuer to comply with the
Securities Act of 1933, as amended (the "Act"), and any rules, regulations and
requirements of the Securities and Exchange Commission thereunder, in connection
with the registration under the Act of such number of shares of common stock of
the Issuer (the "Shares") as are necessary at the Effective Time to satisfy the
Issuer's obligations arising under Section 2.6 of the Amended and Restated
Agreement and Plan of Merger dated as of February 25, 1999 among the Issuer,
Bank of the West and SierraWest Bancorp including, without limitation, the power
and authority to sign the name of the undersigned in the capacity indicated
below to the Registration Statement on Form S-8 to be filed with the Securities
and Exchange Commission with respect to such Shares, to any and all amendments
or supplements to such Registration Statement, whether such amendments or
supplements are filed before or after the effective date of such Registration
Statement, to any related Registration Statement filed pursuant to Rule 462
under the Act, and to any and all instruments or documents filed as part of or
in connection with such Registration Statement or any and all amendments
thereto, whether such amendments are filed before or after the effective date of
such Registration Statement; and the undersigned hereby ratifies and confirms
all that such attorney and agent shall do or cause to be done by virtue hereof.

     Date: June 9, 1999.

                                    /s/  PAUL MULLIN GANLEY
                                   ----------------------------------
                                   Paul Mullin Ganley
                                    Director


<PAGE>



                                                                   EXHIBIT 24.7


                                POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned, being an officer
or director, or both, of BANCWEST CORPORATION (the "Issuer"), in his capacity as
set forth below, hereby constitutes and appoints WALTER A. DODS, JR. AND HOWARD
H. KARR, of Honolulu, Hawaii, and DON J. MCGRATH, of San Francisco, California,
and each of them, his true and lawful attorney and agent, to do any and all acts
and all things and to execute any and all instruments which said attorney and
agent may deem necessary or desirable to enable the Issuer to comply with the
Securities Act of 1933, as amended (the "Act"), and any rules, regulations and
requirements of the Securities and Exchange Commission thereunder, in connection
with the registration under the Act of such number of shares of common stock of
the Issuer (the "Shares") as are necessary at the Effective Time to satisfy the
Issuer's obligations arising under Section 2.6 of the Amended and Restated
Agreement and Plan of Merger dated as of February 25, 1999 among the Issuer,
Bank of the West and SierraWest Bancorp including, without limitation, the power
and authority to sign the name of the undersigned in the capacity indicated
below to the Registration Statement on Form S-8 to be filed with the Securities
and Exchange Commission with respect to such Shares, to any and all amendments
or supplements to such Registration Statement, whether such amendments or
supplements are filed before or after the effective date of such Registration
Statement, to any related Registration Statement filed pursuant to Rule 462
under the Act, and to any and all instruments or documents filed as part of or
in connection with such Registration Statement or any and all amendments
thereto, whether such amendments are filed before or after the effective date of
such Registration Statement; and the undersigned hereby ratifies and confirms
all that such attorney and agent shall do or cause to be done by virtue hereof.

     Date: June 17, 1999.

                                  /s/  DAVID M. HAIG
                                  ----------------------------------
                                  David M. Haig
                                  Director


<PAGE>



                                                                   EXHIBIT 24.8


                                POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned, being an officer
or director, or both, of BANCWEST CORPORATION (the "Issuer"), in his capacity as
set forth below, hereby constitutes and appoints WALTER A. DODS, JR. AND HOWARD
H. KARR, of Honolulu, Hawaii, and DON J. MCGRATH, of San Francisco, California,
and each of them, his true and lawful attorney and agent, to do any and all acts
and all things and to execute any and all instruments which said attorney and
agent may deem necessary or desirable to enable the Issuer to comply with the
Securities Act of 1933, as amended (the "Act"), and any rules, regulations and
requirements of the Securities and Exchange Commission thereunder, in connection
with the registration under the Act of such number of shares of common stock of
the Issuer (the "Shares") as are necessary at the Effective Time to satisfy the
Issuer's obligations arising under Section 2.6 of the Amended and Restated
Agreement and Plan of Merger dated as of February 25, 1999 among the Issuer,
Bank of the West and SierraWest Bancorp including, without limitation, the power
and authority to sign the name of the undersigned in the capacity indicated
below to the Registration Statement on Form S-8 to be filed with the Securities
and Exchange Commission with respect to such Shares, to any and all amendments
or supplements to such Registration Statement, whether such amendments or
supplements are filed before or after the effective date of such Registration
Statement, to any related Registration Statement filed pursuant to Rule 462
under the Act, and to any and all instruments or documents filed as part of or
in connection with such Registration Statement or any and all amendments
thereto, whether such amendments are filed before or after the effective date of
such Registration Statement; and the undersigned hereby ratifies and confirms
all that such attorney and agent shall do or cause to be done by virtue hereof.

     Date: June 17, 1999.

                                  /s/  JOHN A. HOAG
                                  -----------------------------------
                                  John A. Hoag
                                   Director


<PAGE>



                                                                   EXHIBIT 24.9


                                POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned, being an officer
or director, or both, of BANCWEST CORPORATION (the "Issuer"), in his capacity as
set forth below, hereby constitutes and appoints WALTER A. DODS, JR. AND HOWARD
H. KARR, of Honolulu, Hawaii, and DON J. MCGRATH, of San Francisco, California,
and each of them, his true and lawful attorney and agent, to do any and all acts
and all things and to execute any and all instruments which said attorney and
agent may deem necessary or desirable to enable the Issuer to comply with the
Securities Act of 1933, as amended (the "Act"), and any rules, regulations and
requirements of the Securities and Exchange Commission thereunder, in connection
with the registration under the Act of such number of shares of common stock of
the Issuer (the "Shares") as are necessary at the Effective Time to satisfy the
Issuer's obligations arising under Section 2.6 of the Amended and Restated
Agreement and Plan of Merger dated as of February 25, 1999 among the Issuer,
Bank of the West and SierraWest Bancorp including, without limitation, the power
and authority to sign the name of the undersigned in the capacity indicated
below to the Registration Statement on Form S-8 to be filed with the Securities
and Exchange Commission with respect to such Shares, to any and all amendments
or supplements to such Registration Statement, whether such amendments or
supplements are filed before or after the effective date of such Registration
Statement, to any related Registration Statement filed pursuant to Rule 462
under the Act, and to any and all instruments or documents filed as part of or
in connection with such Registration Statement or any and all amendments
thereto, whether such amendments are filed before or after the effective date of
such Registration Statement; and the undersigned hereby ratifies and confirms
all that such attorney and agent shall do or cause to be done by virtue hereof.

     Date: June 10, 1999.

                                    /s/  BERT T. KOBAYASHI, JR.
                                    -------------------------------------
                                    Bert T. Kobayashi, Jr.
                                    Director


<PAGE>



                                                                  EXHIBIT 24.10


                                POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned, being an officer
or director, or both, of BANCWEST CORPORATION (the "Issuer"), in his capacity as
set forth below, hereby constitutes and appoints WALTER A. DODS, JR. AND HOWARD
H. KARR, of Honolulu, Hawaii, and DON J. MCGRATH, of San Francisco, California,
and each of them, his true and lawful attorney and agent, to do any and all acts
and all things and to execute any and all instruments which said attorney and
agent may deem necessary or desirable to enable the Issuer to comply with the
Securities Act of 1933, as amended (the "Act"), and any rules, regulations and
requirements of the Securities and Exchange Commission thereunder, in connection
with the registration under the Act of such number of shares of common stock of
the Issuer (the "Shares") as are necessary at the Effective Time to satisfy the
Issuer's obligations arising under Section 2.6 of the Amended and Restated
Agreement and Plan of Merger dated as of February 25, 1999 among the Issuer,
Bank of the West and SierraWest Bancorp including, without limitation, the power
and authority to sign the name of the undersigned in the capacity indicated
below to the Registration Statement on Form S-8 to be filed with the Securities
and Exchange Commission with respect to such Shares, to any and all amendments
or supplements to such Registration Statement, whether such amendments or
supplements are filed before or after the effective date of such Registration
Statement, to any related Registration Statement filed pursuant to Rule 462
under the Act, and to any and all instruments or documents filed as part of or
in connection with such Registration Statement or any and all amendments
thereto, whether such amendments are filed before or after the effective date of
such Registration Statement; and the undersigned hereby ratifies and confirms
all that such attorney and agent shall do or cause to be done by virtue hereof.

     Date: June 15, 1999.

                                /s/  MICHEL LARROUILH
                                -----------------------------------
                                Michel Larrouilh
                                Director


<PAGE>



                                                                  EXHIBIT 24.11


                                POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned, being an officer
or director, or both, of BANCWEST CORPORATION (the "Issuer"), in his capacity as
set forth below, hereby constitutes and appoints WALTER A. DODS, JR. AND HOWARD
H. KARR, of Honolulu, Hawaii, and DON J. MCGRATH, of San Francisco, California,
and each of them, his true and lawful attorney and agent, to do any and all acts
and all things and to execute any and all instruments which said attorney and
agent may deem necessary or desirable to enable the Issuer to comply with the
Securities Act of 1933, as amended (the "Act"), and any rules, regulations and
requirements of the Securities and Exchange Commission thereunder, in connection
with the registration under the Act of such number of shares of common stock of
the Issuer (the "Shares") as are necessary at the Effective Time to satisfy the
Issuer's obligations arising under Section 2.6 of the Amended and Restated
Agreement and Plan of Merger dated as of February 25, 1999 among the Issuer,
Bank of the West and SierraWest Bancorp including, without limitation, the power
and authority to sign the name of the undersigned in the capacity indicated
below to the Registration Statement on Form S-8 to be filed with the Securities
and Exchange Commission with respect to such Shares, to any and all amendments
or supplements to such Registration Statement, whether such amendments or
supplements are filed before or after the effective date of such Registration
Statement, to any related Registration Statement filed pursuant to Rule 462
under the Act, and to any and all instruments or documents filed as part of or
in connection with such Registration Statement or any and all amendments
thereto, whether such amendments are filed before or after the effective date of
such Registration Statement; and the undersigned hereby ratifies and confirms
all that such attorney and agent shall do or cause to be done by virtue hereof.

     Date: June 23, 1999.

                                    /s/ VIVIEN LEVY-GARBOUA
                                    ------------------------------------
                                    Vivien Levy-Garboua
                                    Director


<PAGE>



                                                                  EXHIBIT 24.12


                                POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned, being an officer
or director, or both, of BANCWEST CORPORATION (the "Issuer"), in his capacity as
set forth below, hereby constitutes and appoints WALTER A. DODS, JR. AND HOWARD
H. KARR, of Honolulu, Hawaii, and DON J. MCGRATH, of San Francisco, California,
and each of them, his true and lawful attorney and agent, to do any and all acts
and all things and to execute any and all instruments which said attorney and
agent may deem necessary or desirable to enable the Issuer to comply with the
Securities Act of 1933, as amended (the "Act"), and any rules, regulations and
requirements of the Securities and Exchange Commission thereunder, in connection
with the registration under the Act of such number of shares of common stock of
the Issuer (the "Shares") as are necessary at the Effective Time to satisfy the
Issuer's obligations arising under Section 2.6 of the Amended and Restated
Agreement and Plan of Merger dated as of February 25, 1999 among the Issuer,
Bank of the West and SierraWest Bancorp including, without limitation, the power
and authority to sign the name of the undersigned in the capacity indicated
below to the Registration Statement on Form S-8 to be filed with the Securities
and Exchange Commission with respect to such Shares, to any and all amendments
or supplements to such Registration Statement, whether such amendments or
supplements are filed before or after the effective date of such Registration
Statement, to any related Registration Statement filed pursuant to Rule 462
under the Act, and to any and all instruments or documents filed as part of or
in connection with such Registration Statement or any and all amendments
thereto, whether such amendments are filed before or after the effective date of
such Registration Statement; and the undersigned hereby ratifies and confirms
all that such attorney and agent shall do or cause to be done by virtue hereof.

     Date: June 17, 1999.

                                /s/  YVES MARTRENCHAR
                               -----------------------------------
                                Yves Martrenchar
                                Director


<PAGE>



                                                                  EXHIBIT 24.13


                                POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned, being an officer
or director, or both, of BANCWEST CORPORATION (the "Issuer"), in his capacity as
set forth below, hereby constitutes and appoints WALTER A. DODS, JR. AND HOWARD
H. KARR, of Honolulu, Hawaii, and DON J. MCGRATH, of San Francisco, California,
and each of them, his true and lawful attorney and agent, to do any and all acts
and all things and to execute any and all instruments which said attorney and
agent may deem necessary or desirable to enable the Issuer to comply with the
Securities Act of 1933, as amended (the "Act"), and any rules, regulations and
requirements of the Securities and Exchange Commission thereunder, in connection
with the registration under the Act of such number of shares of common stock of
the Issuer (the "Shares") as are necessary at the Effective Time to satisfy the
Issuer's obligations arising under Section 2.6 of the Amended and Restated
Agreement and Plan of Merger dated as of February 25, 1999 among the Issuer,
Bank of the West and SierraWest Bancorp including, without limitation, the power
and authority to sign the name of the undersigned in the capacity indicated
below to the Registration Statement on Form S-8 to be filed with the Securities
and Exchange Commission with respect to such Shares, to any and all amendments
or supplements to such Registration Statement, whether such amendments or
supplements are filed before or after the effective date of such Registration
Statement, to any related Registration Statement filed pursuant to Rule 462
under the Act, and to any and all instruments or documents filed as part of or
in connection with such Registration Statement or any and all amendments
thereto, whether such amendments are filed before or after the effective date of
such Registration Statement; and the undersigned hereby ratifies and confirms
all that such attorney and agent shall do or cause to be done by virtue hereof.

     Date: June 17, 1999.

                                    /s/  DR. FUJIO MATSUDA
                                    ---------------------------------
                                    Dr. Fujio Matsuda
                                    Director


<PAGE>



                                                                  EXHIBIT 24.14


                                POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned, being an officer
or director, or both, of BANCWEST CORPORATION (the "Issuer"), in his capacity as
set forth below, hereby constitutes and appoints WALTER A. DODS, JR. AND HOWARD
H. KARR, of Honolulu, Hawaii, and DON J. MCGRATH, of San Francisco, California,
and each of them, his true and lawful attorney and agent, to do any and all acts
and all things and to execute any and all instruments which said attorney and
agent may deem necessary or desirable to enable the Issuer to comply with the
Securities Act of 1933, as amended (the "Act"), and any rules, regulations and
requirements of the Securities and Exchange Commission thereunder, in connection
with the registration under the Act of such number of shares of common stock of
the Issuer (the "Shares") as are necessary at the Effective Time to satisfy the
Issuer's obligations arising under Section 2.6 of the Amended and Restated
Agreement and Plan of Merger dated as of February 25, 1999 among the Issuer,
Bank of the West and SierraWest Bancorp including, without limitation, the power
and authority to sign the name of the undersigned in the capacity indicated
below to the Registration Statement on Form S-8 to be filed with the Securities
and Exchange Commission with respect to such Shares, to any and all amendments
or supplements to such Registration Statement, whether such amendments or
supplements are filed before or after the effective date of such Registration
Statement, to any related Registration Statement filed pursuant to Rule 462
under the Act, and to any and all instruments or documents filed as part of or
in connection with such Registration Statement or any and all amendments
thereto, whether such amendments are filed before or after the effective date of
such Registration Statement; and the undersigned hereby ratifies and confirms
all that such attorney and agent shall do or cause to be done by virtue hereof.

     Date: June 17, 1999.

                                /s/  DON J. MCGRATH
                                ----------------------------------
                                Don J. McGrath
                                Director


<PAGE>



                                                                 EXHIBIT 24.15


                                POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned, being an officer
or director, or both, of BANCWEST CORPORATION (the "Issuer"), in his capacity as
set forth below, hereby constitutes and appoints WALTER A. DODS, JR. AND HOWARD
H. KARR, of Honolulu, Hawaii, and DON J. MCGRATH, of San Francisco, California,
and each of them, his true and lawful attorney and agent, to do any and all acts
and all things and to execute any and all instruments which said attorney and
agent may deem necessary or desirable to enable the Issuer to comply with the
Securities Act of 1933, as amended (the "Act"), and any rules, regulations and
requirements of the Securities and Exchange Commission thereunder, in connection
with the registration under the Act of such number of shares of common stock of
the Issuer (the "Shares") as are necessary at the Effective Time to satisfy the
Issuer's obligations arising under Section 2.6 of the Amended and Restated
Agreement and Plan of Merger dated as of February 25, 1999 among the Issuer,
Bank of the West and SierraWest Bancorp including, without limitation, the power
and authority to sign the name of the undersigned in the capacity indicated
below to the Registration Statement on Form S-8 to be filed with the Securities
and Exchange Commission with respect to such Shares, to any and all amendments
or supplements to such Registration Statement, whether such amendments or
supplements are filed before or after the effective date of such Registration
Statement, to any related Registration Statement filed pursuant to Rule 462
under the Act, and to any and all instruments or documents filed as part of or
in connection with such Registration Statement or any and all amendments
thereto, whether such amendments are filed before or after the effective date of
such Registration Statement; and the undersigned hereby ratifies and confirms
all that such attorney and agent shall do or cause to be done by virtue hereof.

     Date: June 17, 1999.

                                 /s/  RODNEY R. PECK
                                 -----------------------------------
                                 Rodney R. Peck
                                 Director


<PAGE>



                                                                  EXHIBIT 24.16


                                POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned, being an officer
or director, or both, of BANCWEST CORPORATION (the "Issuer"), in his capacity as
set forth below, hereby constitutes and appoints WALTER A. DODS, JR. AND HOWARD
H. KARR, of Honolulu, Hawaii, and DON J. MCGRATH, of San Francisco, California,
and each of them, his true and lawful attorney and agent, to do any and all acts
and all things and to execute any and all instruments which said attorney and
agent may deem necessary or desirable to enable the Issuer to comply with the
Securities Act of 1933, as amended (the "Act"), and any rules, regulations and
requirements of the Securities and Exchange Commission thereunder, in connection
with the registration under the Act of such number of shares of common stock of
the Issuer (the "Shares") as are necessary at the Effective Time to satisfy the
Issuer's obligations arising under Section 2.6 of the Amended and Restated
Agreement and Plan of Merger dated as of February 25, 1999 among the Issuer,
Bank of the West and SierraWest Bancorp including, without limitation, the power
and authority to sign the name of the undersigned in the capacity indicated
below to the Registration Statement on Form S-8 to be filed with the Securities
and Exchange Commission with respect to such Shares, to any and all amendments
or supplements to such Registration Statement, whether such amendments or
supplements are filed before or after the effective date of such Registration
Statement, to any related Registration Statement filed pursuant to Rule 462
under the Act, and to any and all instruments or documents filed as part of or
in connection with such Registration Statement or any and all amendments
thereto, whether such amendments are filed before or after the effective date of
such Registration Statement; and the undersigned hereby ratifies and confirms
all that such attorney and agent shall do or cause to be done by virtue hereof.

     Date: June 11, 1999.

                                /s/  JOEL SIBRAC
                               ----------------------------------
                                Joel Sibrac
                                Director


<PAGE>



                                                                  EXHIBIT 24.17


                                POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned, being an officer
or director, or both, of BANCWEST CORPORATION (the "Issuer"), in his capacity as
set forth below, hereby constitutes and appoints WALTER A. DODS, JR. AND HOWARD
H. KARR, of Honolulu, Hawaii, and DON J. MCGRATH, of San Francisco, California,
and each of them, his true and lawful attorney and agent, to do any and all acts
and all things and to execute any and all instruments which said attorney and
agent may deem necessary or desirable to enable the Issuer to comply with the
Securities Act of 1933, as amended (the "Act"), and any rules, regulations and
requirements of the Securities and Exchange Commission thereunder, in connection
with the registration under the Act of such number of shares of common stock of
the Issuer (the "Shares") as are necessary at the Effective Time to satisfy the
Issuer's obligations arising under Section 2.6 of the Amended and Restated
Agreement and Plan of Merger dated as of February 25, 1999 among the Issuer,
Bank of the West and SierraWest Bancorp including, without limitation, the power
and authority to sign the name of the undersigned in the capacity indicated
below to the Registration Statement on Form S-8 to be filed with the Securities
and Exchange Commission with respect to such Shares, to any and all amendments
or supplements to such Registration Statement, whether such amendments or
supplements are filed before or after the effective date of such Registration
Statement, to any related Registration Statement filed pursuant to Rule 462
under the Act, and to any and all instruments or documents filed as part of or
in connection with such Registration Statement or any and all amendments
thereto, whether such amendments are filed before or after the effective date of
such Registration Statement; and the undersigned hereby ratifies and confirms
all that such attorney and agent shall do or cause to be done by virtue hereof.

     Date: June 10, 1999.

                                  /s/  JOHN K. TSUI
                                  ---------------------------------------
                                  John K. Tsui
                                  Director


<PAGE>



                                                                  EXHIBIT 24.18


                               POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned, being an officer
or director, or both, of BANCWEST CORPORATION (the "Issuer"), in his capacity as
set forth below, hereby constitutes and appoints WALTER A. DODS, JR. AND HOWARD
H. KARR, of Honolulu, Hawaii, and DON J. MCGRATH, of San Francisco, California,
and each of them, his true and lawful attorney and agent, to do any and all acts
and all things and to execute any and all instruments which said attorney and
agent may deem necessary or desirable to enable the Issuer to comply with the
Securities Act of 1933, as amended (the "Act"), and any rules, regulations and
requirements of the Securities and Exchange Commission thereunder, in connection
with the registration under the Act of such number of shares of common stock of
the Issuer (the "Shares") as are necessary at the Effective Time to satisfy the
Issuer's obligations arising under Section 2.6 of the Amended and Restated
Agreement and Plan of Merger dated as of February 25, 1999 among the Issuer,
Bank of the West and SierraWest Bancorp including, without limitation, the power
and authority to sign the name of the undersigned in the capacity indicated
below to the Registration Statement on Form S-8 to be filed with the Securities
and Exchange Commission with respect to such Shares, to any and all amendments
or supplements to such Registration Statement, whether such amendments or
supplements are filed before or after the effective date of such Registration
Statement, to any related Registration Statement filed pursuant to Rule 462
under the Act, and to any and all instruments or documents filed as part of or
in connection with such Registration Statement or any and all amendments
thereto, whether such amendments are filed before or after the effective date of
such Registration Statement; and the undersigned hereby ratifies and confirms
all that such attorney and agent shall do or cause to be done by virtue hereof.

     Date: June 14, 1999.

                                    /s/  JACQUES HENRI WAHL
                                    -------------------------------------
                                    Jacques Henri Wahl
                                    Director


<PAGE>



                                                                  EXHIBIT 24.19


                                POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned, being an officer
or director, or both, of BANCWEST CORPORATION (the "Issuer"), in his capacity as
set forth below, hereby constitutes and appoints WALTER A. DODS, JR. AND HOWARD
H. KARR, of Honolulu, Hawaii, and DON J. MCGRATH, of San Francisco, California,
and each of them, his true and lawful attorney and agent, to do any and all acts
and all things and to execute any and all instruments which said attorney and
agent may deem necessary or desirable to enable the Issuer to comply with the
Securities Act of 1933, as amended (the "Act"), and any rules, regulations and
requirements of the Securities and Exchange Commission thereunder, in connection
with the registration under the Act of such number of shares of common stock of
the Issuer (the "Shares") as are necessary at the Effective Time to satisfy the
Issuer's obligations arising under Section 2.6 of the Amended and Restated
Agreement and Plan of Merger dated as of February 25, 1999 among the Issuer,
Bank of the West and SierraWest Bancorp including, without limitation, the power
and authority to sign the name of the undersigned in the capacity indicated
below to the Registration Statement on Form S-8 to be filed with the Securities
and Exchange Commission with respect to such Shares, to any and all amendments
or supplements to such Registration Statement, whether such amendments or
supplements are filed before or after the effective date of such Registration
Statement, to any related Registration Statement filed pursuant to Rule 462
under the Act, and to any and all instruments or documents filed as part of or
in connection with such Registration Statement or any and all amendments
thereto, whether such amendments are filed before or after the effective date of
such Registration Statement; and the undersigned hereby ratifies and confirms
all that such attorney and agent shall do or cause to be done by virtue hereof.

     Date: June 17, 1999.

                                 /s/  FRED C. WEYAND
                                ------------------------------------------
                                 Fred C. Weyand
                                 Director


<PAGE>


                                                                 EXHIBIT 24.20


                                POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned, being an officer
or director, or both, of BANCWEST CORPORATION (the "Issuer"), in his capacity as
set forth below, hereby constitutes and appoints WALTER A. DODS, JR. AND HOWARD
H. KARR, of Honolulu, Hawaii, and DON J. MCGRATH, of San Francisco, California,
and each of them, his true and lawful attorney and agent, to do any and all acts
and all things and to execute any and all instruments which said attorney and
agent may deem necessary or desirable to enable the Issuer to comply with the
Securities Act of 1933, as amended (the "Act"), and any rules, regulations and
requirements of the Securities and Exchange Commission thereunder, in connection
with the registration under the Act of such number of shares of common stock of
the Issuer (the "Shares") as are necessary at the Effective Time to satisfy the
Issuer's obligations arising under Section 2.6 of the Amended and Restated
Agreement and Plan of Merger dated as of February 25, 1999 among the Issuer,
Bank of the West and SierraWest Bancorp including, without limitation, the power
and authority to sign the name of the undersigned in the capacity indicated
below to the Registration Statement on Form S-8 to be filed with the Securities
and Exchange Commission with respect to such Shares, to any and all amendments
or supplements to such Registration Statement, whether such amendments or
supplements are filed before or after the effective date of such Registration
Statement, to any related Registration Statement filed pursuant to Rule 462
under the Act, and to any and all instruments or documents filed as part of or
in connection with such Registration Statement or any and all amendments
thereto, whether such amendments are filed before or after the effective date of
such Registration Statement; and the undersigned hereby ratifies and confirms
all that such attorney and agent shall do or cause to be done by virtue hereof.

     Date: June 17, 1999.

                                  /s/  ROBERT C. WO
                                  -------------------------------------
                                  Robert C. Wo
                                  Director


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