TACOMA, Wash., April 8 /PRNewswire-FirstCall/ -- Columbia Banking System, Inc. (Nasdaq: COLB) expects to report first quarter 2009 financial results on Wednesday, April 22, 2009, just prior to their Annual Meeting for Shareholders scheduled for 1:00 p.m., PDT (4:00 p.m. EDT). Management will discuss these results on a conference call scheduled for the following day, Thursday, April 23, 2009 at 1:00 p.m. PST (4:00 p.m. EDT). Interested parties may listen to this discussion by calling 1-888-318-7969; Conference ID code #94453464.

A conference call replay will be available from approximately 4:00 p.m. PDT on April 23, 2009 through midnight PDT on Thursday, April 30, 2009. The conference call replay can be accessed by dialing 1-800-642-1687 and entering Conference ID code 94453464.

About Columbia

Headquartered in Tacoma, Washington, Columbia Banking System, Inc. is the holding company of Columbia Bank, a Washington state-chartered full-service commercial bank which was selected by Washington CEO magazine as one of 2008's "Washington's Best 100 Companies to Work For". With the 2007 acquisitions of Mountain Bank Holding Company and Town Center Bancorp and the 2008 internal merger of its subsidiary, Bank of Astoria, into Columbia Bank, Columbia Banking System has 50 banking offices in Pierce, King, Cowlitz, Kitsap, Thurston and Whatcom counties in Washington State, and Clackamas, Clatsop, Tillamook and Multnomah counties in Oregon. Included in Columbia Bank are former branches of Mt. Rainier National Bank, doing business as Mt. Rainier Bank, with 5 branches in King and Pierce counties. Columbia Bank does business under the Bank of Astoria name at the Bank of Astoria's former branches located in Astoria, Warrenton, Seaside and Cannon Beach in Clatsop County and in Manzanita and Tillamook in Tillamook County. More information about Columbia can be found on its website at www.columbiabank.com.

    Contacts:  JoAnne Coy, Vice President,
               Corporate Communications
               253-305-1965; jcoy@columbiabank.com

SOURCE Columbia Banking System, Inc.

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