<TABLE> <S> <C>

<PAGE>
<ARTICLE> 9
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1996
<PERIOD-START>                             JAN-01-1997             JAN-01-1996
<PERIOD-END>                               MAR-31-1997             MAR-31-1996
<CASH>                                         183,451                 151,573
<INT-BEARING-DEPOSITS>                          18,304                  17,008
<FED-FUNDS-SOLD>                                 4,477                  10,998
<TRADING-ASSETS>                                45,411                  19,763
<INVESTMENTS-HELD-FOR-SALE>                    724,847                 572,420
<INVESTMENTS-CARRYING>                         886,277                 826,984
<INVESTMENTS-MARKET>                           870,244                 819,297
<LOANS>                                      2,431,322               1,983,881
<ALLOWANCE>                                     36,739                  30,224
<TOTAL-ASSETS>                               4,429,162               3,663,372
<DEPOSITS>                                   2,966,508               2,556,362
<SHORT-TERM>                                   610,389                 393,267
<LIABILITIES-OTHER>                             88,292                  48,892
<LONG-TERM>                                    441,852                 366,162
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                       322,121                 298,689
<OTHER-SE>                                           0                       0
<TOTAL-LIABILITIES-AND-EQUITY>               4,429,162               3,663,372
<INTEREST-LOAN>                                 53,015                  43,979
<INTEREST-INVEST>                               25,595                  22,224
<INTEREST-OTHER>                                   727                   1,047
<INTEREST-TOTAL>                                79,337                  67,250
<INTEREST-DEPOSIT>                              29,445                  25,125
<INTEREST-EXPENSE>                              41,480                  34,919
<INTEREST-INCOME-NET>                           37,857                  32,331
<LOAN-LOSSES>                                    3,454                   2,842
<SECURITIES-GAINS>                                  (1)                     25
<EXPENSE-OTHER>                                 28,954                  24,421
<INCOME-PRETAX>                                 23,044                  20,024
<INCOME-PRE-EXTRAORDINARY>                      23,044                  20,024
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                    15,115                  13,276
<EPS-PRIMARY>                                      .30                     .27
<EPS-DILUTED>                                      .30                     .26
<YIELD-ACTUAL>                                    3.97                    3.96
<LOANS-NON>                                          0                       0
<LOANS-PAST>                                     4,430                   3,670
<LOANS-TROUBLED>                                     0                       0
<LOANS-PROBLEM>                                      0                       0
<ALLOWANCE-OPEN>                                35,514                  29,010
<CHARGE-OFFS>                                    3,339                   2,607
<RECOVERIES>                                       785                     979
<ALLOWANCE-CLOSE>                               36,739                  30,224
<ALLOWANCE-DOMESTIC>                            36,739                  30,224
<ALLOWANCE-FOREIGN>                                  0                       0
<ALLOWANCE-UNALLOCATED>                              0                       0
        

</TABLE>