0001193125-04-083175 10-Q 4 20040331 20040510 COLUMBIA BANKING SYSTEM INC 0000887343 6022 911422237 WA 1231 10-Q 34 000-20288 04791389 1102 BROADWAY PLAZA TACOMA WA 98402 2533051900 1102 BROADWAY PLAZA TACOMA WA 98402 10-Q 1 d10q.htm FORM 10-Q FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2004 EX-31.1 2 dex311.htm CERTIFICATION OF CEO PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT EX-31.2 3 dex312.htm CERTIFICATION OF CFO PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT EX-32 4 dex32.htm CERTIFICATION PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002