<TABLE> <S> <C>

<PAGE>
<ARTICLE> 9
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM AUDITED
FINANCIAL STATEMENTS CONTAINED IN THE COMPANY'S ANNUAL REPORT IN FORM 10-K FOR
THE YEARS ENDED DECEMBER 31, 1997 AND DECEMBER 31, 1996 AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   YEAR                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1996
<PERIOD-START>                             JAN-01-1997             JAN-01-1996
<PERIOD-END>                               DEC-31-1997             DEC-31-1996
<CASH>                                         254,676                 204,084
<INT-BEARING-DEPOSITS>                          12,131                   7,492
<FED-FUNDS-SOLD>                                76,455                  32,975
<TRADING-ASSETS>                                     0                       0
<INVESTMENTS-HELD-FOR-SALE>                  1,539,922                 546,174
<INVESTMENTS-CARRYING>                         221,991                 261,446
<INVESTMENTS-MARKET>                           223,829                 262,077
<LOANS>                                      3,024,322               2,395,165
<ALLOWANCE>                                     40,045                  30,165
<TOTAL-ASSETS>                               5,454,135               3,606,406
<DEPOSITS>                                   4,152,918               2,972,744
<SHORT-TERM>                                   230,777                 170,537
<LIABILITIES-OTHER>                            437,898                 121,028
<LONG-TERM>                                    124,529                  54,758
<PREFERRED-MANDATORY>                          120,000                       0
<PREFERRED>                                          0                  22,988
<COMMON>                                           474                     408
<OTHER-SE>                                     387,539                 260,997
<TOTAL-LIABILITIES-AND-EQUITY>               5,454,135               3,606,406
<INTEREST-LOAN>                                258,859                 218,307
<INTEREST-INVEST>                               64,234                  49,077
<INTEREST-OTHER>                                 3,426                   2,814
<INTEREST-TOTAL>                               326,519                 270,198
<INTEREST-DEPOSIT>                             119,024                  94,522
<INTEREST-EXPENSE>                             134,540                 108,761
<INTEREST-INCOME-NET>                          191,979                 161,437
<LOAN-LOSSES>                                    6,107                   7,483
<SECURITIES-GAINS>                                 466                      93
<EXPENSE-OTHER>                                149,953                 125,980
<INCOME-PRETAX>                                 83,122                  64,920
<INCOME-PRE-EXTRAORDINARY>                      58,311                  41,522
<EXTRAORDINARY>                                    702                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                    59,013                  41,522
<EPS-PRIMARY>                                     1.36                    1.01
<EPS-DILUTED>                                     1.32                     .97
<YIELD-ACTUAL>                                       0                       0
<LOANS-NON>                                     14,801                  15,283
<LOANS-PAST>                                     3,748                   2,678
<LOANS-TROUBLED>                                   140                     267
<LOANS-PROBLEM>                                      0                       0
<ALLOWANCE-OPEN>                                30,165                  25,906
<CHARGE-OFFS>                                    8,903                   5,512
<RECOVERIES>                                     2,611                   1,504
<ALLOWANCE-CLOSE>                               40,045                  30,165
<ALLOWANCE-DOMESTIC>                            19,905                  15,159
<ALLOWANCE-FOREIGN>                                  0                       0
<ALLOWANCE-UNALLOCATED>                         20,140                  15,006
        

</TABLE>