0001193125-07-102891 10-Q 5 20070331 20070504 20070504 COLUMBIA BANKING SYSTEM INC 0000887343 6022 911422237 WA 1231 10-Q 34 000-20288 07820754 1102 BROADWAY PLAZA TACOMA WA 98402 2533051900 1102 BROADWAY PLAZA TACOMA WA 98402 10-Q 1 d10q.htm FORM 10-Q EX-10.1 2 dex101.htm CHANGE IN CONTROL AGREEMENT EX-31.1 3 dex311.htm CERTIFICATION OF CHIEF EXECUTIVE OFFICER EX-31.2 4 dex312.htm CERTIFICATION OF CHIEF FINANCIAL OFFICER EX-32 5 dex32.htm SECTION 906 CERTIFICATION