0001032210-00-000553 DEF 14A 1 20000425 20000322 COLUMBIA BANKING SYSTEM INC 0000887343 6035 911422237 WA 1231 DEF 14A 34 000-20288 575457 1102 BROADWAY PLAZA TACOMA WA 98402 2533051900 1102 BROADWAY PLAZA TACOMA WA 98402 DEF 14A 1 000103221000000553-001-seq1-def-14a.txt DEFINITIVE 14A