0001193125-04-100651 8-K 3 20040607 5 7 20040609 COLUMBIA BANKING SYSTEM INC 0000887343 6022 911422237 WA 1231 8-K 34 000-20288 04855368 1102 BROADWAY PLAZA TACOMA WA 98402 2533051900 1102 BROADWAY PLAZA TACOMA WA 98402 8-K 1 d8k.htm FORM 8-K EX-2 2 dex2.htm PLAN AND AGREEMENT OF MERGER DATED AS OF JUNE 7, 2004 EX-99.1 3 dex991.htm PRESS RELEASE DATED JUNE 7, 2004