COLUMBIA BANKING SYSTEM INC
SC 13G, 1997-02-21
SAVINGS INSTITUTION, FEDERALLY CHARTERED
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G

                   Under the Securities Exchange Act of 1934

                          (Amendment No. _______ )*

                       Columbia Banking System, Inc.
- -------------------------------------------------------------------------------
                                (Name of Issuer)

                                Common Stock
- -------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                  197236102
- -------------------------------------------------------------------------------
                                (CUSIP Number)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities,
and for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).


             IN ACCORDANCE WITH RULE 201 OF REGULATION S-T, THIS
         SCHEDULE 13G IS BEING FILED IN PAPER PURSUANT TO A TEMPORARY
                              HARDSHIP EXEMPTION

                              Page 1 of 10 pages
<PAGE>   2
<TABLE>
<CAPTION>



CUSIP No.    197236102                                       13G                                          Page 2 of 10 Pages
- -----------------------------------------------------------------------------------------------------------------------------------
<S>       <C>                                                 <C>                                          <C>
1         NAME OF REPORTING PERSON
          S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Artisan Partners Limited Partnership 39-1807188      
- -----------------------------------------------------------------------------------------------------------------------------------
 2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                                 (a)    [ ] 

          Not Applicable                                                                                    (b)    [ ] 
- -----------------------------------------------------------------------------------------------------------------------------------
 3        SEC USE ONLY
 
- -----------------------------------------------------------------------------------------------------------------------------------
 4        CITIZENSHIP OR PLACE OF ORGANIZATION

          Delaware     
- -----------------------------------------------------------------------------------------------------------------------------------
                                                     SOLE VOTING POWER
           NUMBER OF                       5         None
             SHARES                        ---------------------------------------------------------------------------------
          BENEFICIALLY                               SHARED VOTING POWER
            OWNED BY                       6         343,000
              EACH                         --------------------------------------------------------------------------------
           REPORTING                                 SOLE DISPOSITIVE POWER
             PERSON                        7         None   
              WITH                         ---------------------------------------------------------------------------------
                                           8         SHARED DISPOSITIVE POWER
                                                     343,000   
- --------------------------------------------------------------------------------------------------------------------------------
  9             AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                343,000 
- --------------------------------------------------------------------------------------------------------------------------------
 10             CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                Not Applicable
- --------------------------------------------------------------------------------------------------------------------------------
 11             PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                9.24%
- --------------------------------------------------------------------------------------------------------------------------------
 12             TYPE OF REPORTING PERSON*
                IA
- --------------------------------------------------------------------------------------------------------------------------------
</TABLE>



                      *SEE INSTRUCTION BEFORE FILLING OUT!

<PAGE>   3
<TABLE>
<CAPTION>

CUSIP No. 197236102                                           13G                            Page 3 of 10 pages
- -----------------------------------------------------------------------------------------------------------------------------------
<S>       <C>                                                 <C>                                          <C>
1         NAME OF REPORTING PERSON
          S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Artisan Investment Corporation                       
- -----------------------------------------------------------------------------------------------------------------------------------
 2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                                 (a) [  ]

          Not Applicable                                                                                    (b) [  ]
- -----------------------------------------------------------------------------------------------------------------------------------
 3        SEC USE ONLY
 
- -----------------------------------------------------------------------------------------------------------------------------------
 4        CITIZENSHIP OR PLACE OF ORGANIZATION

          Delaware     
- -----------------------------------------------------------------------------------------------------------------------------------
                                                            SOLE VOTING POWER
                  NUMBER OF                       5         None
                    SHARES                        ---------------------------------------------------------------------------------
                 BENEFICIALLY                               SHARED VOTING POWER
                   OWNED BY                       6         343,000
                     EACH                         --------------------------------------------------------------------------------
                  REPORTING                                 SOLE DISPOSITIVE POWER
                    PERSON                        7         None   
                     WITH                         ---------------------------------------------------------------------------------
                                                  8         SHARED DISPOSITIVE POWER
                                                            343,000   
- --------------------------------------------------------------------------------------------------------------------------
       9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                     343,000 
- --------------------------------------------------------------------------------------------------------------------------
      10             CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                     Not Applicable
- --------------------------------------------------------------------------------------------------------------------------
      11             PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                     9.24%
- --------------------------------------------------------------------------------------------------------------------------
      12             TYPE OF REPORTING PERSON*
                     CO
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>



                      *SEE INSTRUCTION BEFORE FILLING OUT!


<PAGE>   4
<TABLE>
<CAPTION>

CUSIP No. 197236102                                           13G                            Page 4 of 10 pages
- -----------------------------------------------------------------------------------------------------------------------------------
<S>       <C>                                                 <C>                                          <C>
1         NAME OF REPORTING PERSON
          S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Andrew A. Ziegler                                    
- -----------------------------------------------------------------------------------------------------------------------------------
 2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                                 (a) [  ]

          Not Applicable                                                                                    (b) [  ]
- -----------------------------------------------------------------------------------------------------------------------------------
 3        SEC USE ONLY
 
- -----------------------------------------------------------------------------------------------------------------------------------
 4        CITIZENSHIP OR PLACE OF ORGANIZATION

          U.S.A.             
- -----------------------------------------------------------------------------------------------------------------------------------
                                                            SOLE VOTING POWER
                  NUMBER OF                       5         None
                    SHARES                        ---------------------------------------------------------------------------------
                 BENEFICIALLY                               SHARED VOTING POWER
                   OWNED BY                       6         343,000
                     EACH                         --------------------------------------------------------------------------------
                  REPORTING                                 SOLE DISPOSITIVE POWER
                    PERSON                        7         None   
                     WITH                         ---------------------------------------------------------------------------------
                                                  8         SHARED DISPOSITIVE POWER
                                                            343,000   
- --------------------------------------------------------------------------------------------------------------------------
       9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                     343,000 
- --------------------------------------------------------------------------------------------------------------------------
      10             CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                     Not Applicable
- --------------------------------------------------------------------------------------------------------------------------
      11             PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                     9.24%
- --------------------------------------------------------------------------------------------------------------------------
      12             TYPE OF REPORTING PERSON*
                     IN
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>



                      *SEE INSTRUCTION BEFORE FILLING OUT!


<PAGE>   5
<TABLE>
<CAPTION>
- ---------------------                                                                                     -------------------
CUSIP No. 197236102                                           13G                                         Page 5 of 10 Pages
- -----------------------------------------------------------------------------------------------------------------------------------
<S>       <C>                                                 <C>                                          <C>
1         NAME OF REPORTING PERSON
          S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Carlene Murphy Ziegler                                    
- -----------------------------------------------------------------------------------------------------------------------------------
 2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                                 (a) [  ]

          Not Applicable                                                                                    (b) [  ]
- -----------------------------------------------------------------------------------------------------------------------------------
 3        SEC USE ONLY
 
- -----------------------------------------------------------------------------------------------------------------------------------
 4        CITIZENSHIP OR PLACE OF ORGANIZATION

          U.S.A.             
- -----------------------------------------------------------------------------------------------------------------------------------
                                                            SOLE VOTING POWER
                  NUMBER OF                       5         None
                    SHARES                        ---------------------------------------------------------------------------------
                 BENEFICIALLY                               SHARED VOTING POWER
                   OWNED BY                       6         343,000
                     EACH                         --------------------------------------------------------------------------------
                  REPORTING                                 SOLE DISPOSITIVE POWER
                    PERSON                        7         None   
                     WITH                         ---------------------------------------------------------------------------------
                                                  8         SHARED DISPOSITIVE POWER
                                                            343,000   
- --------------------------------------------------------------------------------------------------------------------------
       9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                     343,000 
- --------------------------------------------------------------------------------------------------------------------------
      10             CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                     Not Applicable
- --------------------------------------------------------------------------------------------------------------------------
      11             PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                     9.24%
- --------------------------------------------------------------------------------------------------------------------------
      12             TYPE OF REPORTING PERSON*
                     IN
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>



                      *SEE INSTRUCTION BEFORE FILLING OUT!



<PAGE>   6




Item 1(a)  Name of Issuer:

                   Columbia Banking System, Inc.

Item 1(b)  Address of Issuer's Principal Executive Offices:

                   1102 Broadway Plaza
                   Tacoma, Washington 98402

Item 2(a)  Name of Person Filing:

                   Artisan Partners Limited Partnership ("Artisan Partners");
                   Artisan Investment Corporation, the general partner of
                    Artisan Partners ("Artisan Corp.")
                   Andrew A. Ziegler
                   Carlene Murphy Ziegler

Item 2(b)  Address of Principal Business Office:

                   Artisan Partners, Artisan Corp., Mr. Ziegler and Ms. Ziegler
                   are all located at:
                   1000 North Water Street
                   #1770
                   Milwaukee, WI 53202

Item 2(c)  Citizenship:

                   Artisan Partners is a Delaware limited partnership.
                   Artisan Corp. is a Delaware corporation.
                   Mr. Ziegler and Ms. Ziegler are U.S. citizens.

Item 2(d)  Title of Class of Securities:

                   Common Stock

Item 2(e)  CUSIP Number:

                   197236102

Item 3     Type of Person:


                   (e)  Artisan Partners is an Investment Adviser
                   registered under section 203 of the Investment Advisers
                   Act of 1940; Artisan Corp. is the General Partner of
                   Artisan Partners; Mr. Ziegler and Ms. Ziegler are
                   the principal stockholders of Artisan Corp.
                   
                   
                          Page 6 of 10 pages


<PAGE>   7




Item 4 Ownership (at December 31, 1996):

                        (a)  Amount owned
                             "beneficially" within the meaning of rule 13d-3:

                              343,000 shares

                        (b)  Percent of class:

                              9.24% (based on 3,711,289 outstanding on October
                              31, 1996)

                        (c)  Number of shares as to
                             which such person has:

                                   (i)  sole power to vote or to direct the
                                        vote: none

                                  (ii)  shared power to vote or to direct the
                                        vote:  343,000

                                  (iii) sole power to dispose or to direct the
                                        disposition of: none

                                  (iv)  shared power to dispose or to direct
                                        disposition of:  343,000


                            Artisan Partners serves as investment adviser to
                            Artisan Funds, Inc., Series Designated Artisan
                            Small Cap Fund (the "Fund").  Various of Artisan
                            Partner's limited partners and employees are also
                            officers and trustees of the Fund, but Artisan
                            Partners does not consider the Fund to be
                            controlled by such persons.  Although the Fund is
                            not controlled by Artisan Partners, pursuant to
                            rule 13d-3(a) shares beneficially owned by the
                            Fund, with respect to which the Fund has delegated
                            to Artisan Partners shared voting power and shared
                            dispositive power, are considered to be shares
                            beneficially owned by Artisan Partners by reason of
                            such delegated powers.   Other clients of
                            Artisan Partners may own shares which are not
                            included in the aggregate number of shares reported
                            herein because Artisan Partners does not have or
                            share voting or investment power over those shares.

    Item 5  Ownership of Five Percent or Less of a Class:

                    Not Applicable

    Item 6  Ownership of More than Five Percent on Behalf of Another Person:


                    The shares reported herein have been acquired on behalf
                    of discretionary clients of Artisan Partners.  Persons
                    other than Artisan Partners are entitled to receive all
                    dividends from, and proceeds from the sale of, those
                    shares.
                    
                              Page 7 of 10 pages

<PAGE>   8

Item 7   Identification and Classification of the Subsidiary Which Acquired the
         Security Being Reported on by the Parent Holding Company:

                 Not Applicable


Item 8   Identification and Classification of Members of the Group:

                 Not Applicable

Item 9   Notice of Dissolution of Group:

                 Not Applicable

Item 10  Certification:

                       By signing below I certify that, to the best of my
                  knowledge and belief, the securities referred to above were
                  acquired in the ordinary course of business and were not
                  acquired for the purpose of and do not have the effect of
                  changing or influencing the control of the issuer of such
                  securities and were not acquired in connection with or as a
                  participant in any transaction having such purpose or effect.

                               Page 8 of 10 pages


<PAGE>   9




                                   Signature

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

Date:  February 14, 1997

                  The undersigned corporation, on the date above written,
                  agrees and consents to the joint filing on its behalf of this
                  Schedule 13G in connection with its beneficial ownership of
                  the security reported herein.

                                        ARTISAN INVESTMENT CORPORATION
                                           for itself and as general partner of
                                           ARTISAN PARTNERS LIMITED PARTNERSHIP

                                        By:  /s/ John M. Blaser
                                             ------------------
                                                 John M. Blaser
                                                 Vice President

                  The undersigned individuals, on the date above written, agree
                  and consent to the joint filing on their behalf of this
                  Schedule 13G in connection with their beneficial ownership of
                  the security reported herein.

                                         ANDREW A. ZIEGLER
                                        
                                         /s/ Andrew A. Ziegler
                                             ---------------------

                                         CARLENE MURPHY ZIEGLER

                                         /s/ Carlene Murphy Ziegler
                                             ---------------------------



                               Page 9 of 10 pages



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