<TABLE> <S> <C>

<PAGE>
<ARTICLE> 9
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   9-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1996
<PERIOD-START>                             JAN-01-1997             JAN-01-1996
<PERIOD-END>                               SEP-30-1997             SEP-30-1996
<CASH>                                         199,129                 136,506
<INT-BEARING-DEPOSITS>                          18,465                  17,332
<FED-FUNDS-SOLD>                                16,570                  14,066
<TRADING-ASSETS>                                21,197                  25,565
<INVESTMENTS-HELD-FOR-SALE>                    611,626                 535,083
<INVESTMENTS-CARRYING>                         962,423                 819,651
<INVESTMENTS-MARKET>                           956,486                 804,022
<LOANS>                                      2,607,352               2,247,777
<ALLOWANCE>                                     39,911                  34,827
<TOTAL-ASSETS>                               4,556,960               3,885,547
<DEPOSITS>                                   2,971,897               2,758,389
<SHORT-TERM>                                   539,864                 345,383
<LIABILITIES-OTHER>                            157,401                  47,099
<LONG-TERM>                                    542,962                 431,858
<PREFERRED-MANDATORY>                          344,836                 302,818
<PREFERRED>                                          0                       0
<COMMON>                                             0                       0
<OTHER-SE>                                           0                       0
<TOTAL-LIABILITIES-AND-EQUITY>               4,556,960               3,885,547
<INTEREST-LOAN>                                168,924                 138,889
<INTEREST-INVEST>                               78,399                  68,231
<INTEREST-OTHER>                                 2,671                   2,995
<INTEREST-TOTAL>                               249,994                 210,115
<INTEREST-DEPOSIT>                              89,314                  78,709
<INTEREST-EXPENSE>                             131,974                 110,560
<INTEREST-INCOME-NET>                          118,020                  99,555
<LOAN-LOSSES>                                   11,285                  11,444
<SECURITIES-GAINS>                                  31                    (38)
<EXPENSE-OTHER>                                 88,234                  77,356
<INCOME-PRETAX>                                 74,958                  63,420
<INCOME-PRE-EXTRAORDINARY>                      74,958                  63,420
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                    49,269                  41,764
<EPS-PRIMARY>                                      .97                     .83
<EPS-DILUTED>                                      .97                     .83
<YIELD-ACTUAL>                                    3.94                    3.90
<LOANS-NON>                                        111                       0
<LOANS-PAST>                                     4,181                   3,068
<LOANS-TROUBLED>                                     0                       0
<LOANS-PROBLEM>                                    319                     583
<ALLOWANCE-OPEN>                                35,514                  29,010
<CHARGE-OFFS>                                    9,676                   7,451
<RECOVERIES>                                     2,163                   2,227
<ALLOWANCE-CLOSE>                               39,911                  34,827
<ALLOWANCE-DOMESTIC>                            39,911                  34,827
<ALLOWANCE-FOREIGN>                                  0                       0
<ALLOWANCE-UNALLOCATED>                              0                       0
        

</TABLE>