<TABLE> <S> <C>

<PAGE>
<ARTICLE> 9
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM UNAUDITED
FINANCIAL STATEMENTS CONTAINED IN THE COMPANY'S QUARTERLY REPORT ON FORM 10-Q 
FOR THE QUARTER ENDED SEPTEMBER 30, 1997, AND IS QUALIFIED IN ITS ENTIRETY BY 
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               SEP-30-1997
<CASH>                                         209,498
<INT-BEARING-DEPOSITS>                          12,782
<FED-FUNDS-SOLD>                                   260
<TRADING-ASSETS>                                     0
<INVESTMENTS-HELD-FOR-SALE>                    920,835
<INVESTMENTS-CARRYING>                         227,234
<INVESTMENTS-MARKET>                           228,545
<LOANS>                                      2,617,085
<ALLOWANCE>                                     37,522
<TOTAL-ASSETS>                               4,248,258
<DEPOSITS>                                   3,457,537
<SHORT-TERM>                                   215,345
<LIABILITIES-OTHER>                            122,961
<LONG-TERM>                                    120,988
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           187
<OTHER-SE>                                     271,240
<TOTAL-LIABILITIES-AND-EQUITY>               4,248,258
<INTEREST-LOAN>                                169,564
<INTEREST-INVEST>                               39,492
<INTEREST-OTHER>                                   650
<INTEREST-TOTAL>                               209,706
<INTEREST-DEPOSIT>                              71,827
<INTEREST-EXPENSE>                              86,221
<INTEREST-INCOME-NET>                          123,485
<LOAN-LOSSES>                                    7,817
<SECURITIES-GAINS>                                 123
<EXPENSE-OTHER>                                 95,610
<INCOME-PRETAX>                                 50,907
<INCOME-PRE-EXTRAORDINARY>                      34,231
<EXTRAORDINARY>                                  (265)
<CHANGES>                                            0
<NET-INCOME>                                    33,966
<EPS-PRIMARY>                                     1.84
<EPS-DILUTED>                                     1.83
<YIELD-ACTUAL>                                       0
<LOANS-NON>                                     17,185
<LOANS-PAST>                                     6,411
<LOANS-TROUBLED>                                   156
<LOANS-PROBLEM>                                      0
<ALLOWANCE-OPEN>                                26,215
<CHARGE-OFFS>                                    7,553
<RECOVERIES>                                     2,228
<ALLOWANCE-CLOSE>                               37,522
<ALLOWANCE-DOMESTIC>                                 0
<ALLOWANCE-FOREIGN>                                  0
<ALLOWANCE-UNALLOCATED>                              0
        

</TABLE>