<TABLE> <S> <C>

<PAGE>
<ARTICLE> 9
<LEGEND>
THIS SCHEDULE CONTAINS FINANCIAL INFORMATION EXTRACTED FROM THE CONSOLIDATED
FINANCIAL STATEMENTS OF PACIFIC NORTHWEST BANCORP AS OF AND FOR THE NINE MONTHS
ENDED SEPTEMBER 30, 2000, AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               SEP-30-2000
<CASH>                                          83,249
<INT-BEARING-DEPOSITS>                           1,841
<FED-FUNDS-SOLD>                                 1,100
<TRADING-ASSETS>                                     0
<INVESTMENTS-HELD-FOR-SALE>                    858,432
<INVESTMENTS-CARRYING>                          66,187
<INVESTMENTS-MARKET>                            64,119
<LOANS>                                      1,717,618
<ALLOWANCE>                                     16,593
<TOTAL-ASSETS>                               2,839,934
<DEPOSITS>                                   1,678,879
<SHORT-TERM>                                   525,689
<LIABILITIES-OTHER>                             43,607
<LONG-TERM>                                    425,483
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        26,188
<OTHER-SE>                                     140,088
<TOTAL-LIABILITIES-AND-EQUITY>               2,839,934
<INTEREST-LOAN>                                120,034
<INTEREST-INVEST>                               41,225
<INTEREST-OTHER>                                 1,246
<INTEREST-TOTAL>                               162,505
<INTEREST-DEPOSIT>                              45,532
<INTEREST-EXPENSE>                              94,317
<INTEREST-INCOME-NET>                           68,188
<LOAN-LOSSES>                                    3,350
<SECURITIES-GAINS>                             (6,770)
<EXPENSE-OTHER>                                 66,379
<INCOME-PRETAX>                                  5,406
<INCOME-PRE-EXTRAORDINARY>                       2,955
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     2,955
<EPS-BASIC>                                       0.19
<EPS-DILUTED>                                     0.19
<YIELD-ACTUAL>                                    3.49
<LOANS-NON>                                     12,936
<LOANS-PAST>                                         0
<LOANS-TROUBLED>                                     0
<LOANS-PROBLEM>                                      0
<ALLOWANCE-OPEN>                                15,182
<CHARGE-OFFS>                                    2,312
<RECOVERIES>                                       373
<ALLOWANCE-CLOSE>                               16,593
<ALLOWANCE-DOMESTIC>                            11,265
<ALLOWANCE-FOREIGN>                                  0
<ALLOWANCE-UNALLOCATED>                          5,328


</TABLE>