EX-23 5 dex23.htm CONSENT OF DELOITTE & TOUCHE, LLP. Consent of Deloitte & Touche, LLP.

Exhibit 23

 

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

 

We consent to the incorporation by reference in Registration Statement Nos. 33-83676, 33-95766, 333-40316, 333-100420, and 333-120131 on Form S-8 of our reports dated March 9, 2005, relating to the consolidated financial statements of Columbia Banking System, Inc. and management’s report of the effectiveness of internal control over financial reporting, appearing in this Annual Report on Form 10-K of Columbia Banking System, Inc. for the year ended December 31, 2004.

 

LOGO

 

Seattle, Washington

March 11, 2005