<TABLE> <S> <C>

<PAGE>
<ARTICLE> 9
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1999             DEC-31-1998
<PERIOD-START>                             JAN-01-1999             JAN-01-1998
<PERIOD-END>                               MAR-31-1999             MAR-31-1998
<CASH>                                         185,087                 216,050
<INT-BEARING-DEPOSITS>                          21,493                  17,704
<FED-FUNDS-SOLD>                                83,196                  54,923
<TRADING-ASSETS>                                40,576                  52,049
<INVESTMENTS-HELD-FOR-SALE>                    881,544                 541,840
<INVESTMENTS-CARRYING>                       1,417,413               1,254,194
<INVESTMENTS-MARKET>                         1,417,755               1,255,460
<LOANS>                                      3,205,888               2,719,212
<ALLOWANCE>                                     49,484                  44,643
<TOTAL-ASSETS>                               6,028,737               4,992,478
<DEPOSITS>                                   3,943,347               3,509,202
<SHORT-TERM>                                   723,911                 467,832
<LIABILITIES-OTHER>                            106,834                  91,378
<LONG-TERM>                                    784,045                 494,859
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                       420,701                 379,320
<OTHER-SE>                                           0                       0
<TOTAL-LIABILITIES-AND-EQUITY>               6,028,737               4,992,478
<INTEREST-LOAN>                                 67,284                  59,976
<INTEREST-INVEST>                               35,144                  26,811
<INTEREST-OTHER>                                 1,690                   1,440
<INTEREST-TOTAL>                               104,118                  88,227
<INTEREST-DEPOSIT>                              34,554                  32,813
<INTEREST-EXPENSE>                              51,524                  43,956
<INTEREST-INCOME-NET>                           52,594                  44,271
<LOAN-LOSSES>                                    2,379                     867
<SECURITIES-GAINS>                                   1                       2
<EXPENSE-OTHER>                                 35,078                  34,141
<INCOME-PRETAX>                                 35,631                  30,269
<INCOME-PRE-EXTRAORDINARY>                      35,631                  30,269
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                    24,068                  20,015
<EPS-PRIMARY>                                      .24                     .20
<EPS-DILUTED>                                      .23                     .19
<YIELD-ACTUAL>                                    4.11                    4.21
<LOANS-NON>                                        129                       0
<LOANS-PAST>                                     4,122                   4,602
<LOANS-TROUBLED>                                     0                       0
<LOANS-PROBLEM>                                      0                       0
<ALLOWANCE-OPEN>                                49,122                  43,297
<CHARGE-OFFS>                                    2,860                   2,525
<RECOVERIES>                                       843                   1,763
<ALLOWANCE-CLOSE>                               49,484                  44,643
<ALLOWANCE-DOMESTIC>                            49,484                  44,643
<ALLOWANCE-FOREIGN>                                  0                       0
<ALLOWANCE-UNALLOCATED>                              0                       0
        

</TABLE>