<TABLE> <S> <C>

<PAGE>
<ARTICLE> 9
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   9-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1995
<PERIOD-START>                             JAN-01-1996             JAN-01-1995
<PERIOD-END>                               SEP-30-1996             SEP-30-1995
<CASH>                                         136,506                 135,734
<INT-BEARING-DEPOSITS>                          17,332                  17,773
<FED-FUNDS-SOLD>                                14,066                  33,720
<TRADING-ASSETS>                                25,565                  19,097
<INVESTMENTS-HELD-FOR-SALE>                    534,083                 806,974
<INVESTMENTS-CARRYING>                         819,651                 622,192
<INVESTMENTS-MARKET>                           804,022                 622,220
<LOANS>                                      2,247,777               1,824,265 
<ALLOWANCE>                                     34,827                  27,456
<TOTAL-ASSETS>                               3,885,547               3,533,852
<DEPOSITS>                                   2,758,389               2,453,572
<SHORT-TERM>                                   345,383                 364,720
<LIABILITIES-OTHER>                             47,099                  33,531
<LONG-TERM>                                    431,858                 403,747
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                       302,818                 278,282
<OTHER-SE>                                           0                       0
<TOTAL-LIABILITIES-AND-EQUITY>               3,885,547               3,533,852
<INTEREST-LOAN>                                138,889                 115,971
<INTEREST-INVEST>                               68,231                  58,484
<INTEREST-OTHER>                                 2,995                   2,772
<INTEREST-TOTAL>                               210,115                 177,177
<INTEREST-DEPOSIT>                              78,709                  70,222
<INTEREST-EXPENSE>                             110,560                  89,687
<INTEREST-INCOME-NET>                           99,555                  87,490
<LOAN-LOSSES>                                   11,444                   6,404
<SECURITIES-GAINS>                                (38)                     219
<EXPENSE-OTHER>                                 77,356                  68,067
<INCOME-PRETAX>                                 63,420                  53,443
<INCOME-PRE-EXTRAORDINARY>                      63,420                  53,443
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                    41,764                  35,849
<EPS-PRIMARY>                                     1.67                    1.42
<EPS-DILUTED>                                     1.66                    1.42
<YIELD-ACTUAL>                                    3.90                    4.21
<LOANS-NON>                                          0                      57
<LOANS-PAST>                                     3,068                   2,953
<LOANS-TROUBLED>                                     0                       0
<LOANS-PROBLEM>                                    583                     754
<ALLOWANCE-OPEN>                                29,010                  24,310
<CHARGE-OFFS>                                    7,451                   4,952
<RECOVERIES>                                     2,227                   1,694
<ALLOWANCE-CLOSE>                               34,827                  27,456
<ALLOWANCE-DOMESTIC>                            34,827                  27,456
<ALLOWANCE-FOREIGN>                                  0                       0
<ALLOWANCE-UNALLOCATED>                              0                       0
        

</TABLE>