0001193125-04-077784 8-K 2 20040428 12 20040504 COLUMBIA BANKING SYSTEM INC 0000887343 6022 911422237 WA 1231 8-K 34 000-20288 04776947 1102 BROADWAY PLAZA TACOMA WA 98402 2533051900 1102 BROADWAY PLAZA TACOMA WA 98402 8-K 1 d8k.htm FORM 8-K EX-99.1 2 dex991.htm PRESS RELEASE DATED APRIL 28, 2004