<TABLE> <S> <C>

<PAGE>
<ARTICLE> 9
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM UNAUDITED
FINANCIAL STATEMENTS CONTAINED IN THE COMPANY'S QUARTERLY REPORTS IN FORM 10-Q
FOR QUARTERS ENDED MARCH 31, 1997, JUNE 30, 1997 AND SEPTEMBER 30, 1997 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-START>                             JAN-01-1997             JAN-01-1997             JAN-01-1997
<PERIOD-END>                               MAR-31-1997             JUN-30-1997             SEP-30-1997
<CASH>                                         145,329                 152,581                 232,743
<INT-BEARING-DEPOSITS>                          14,026                  18,596                  16,630
<FED-FUNDS-SOLD>                                36,775                  34,220                  57,230
<TRADING-ASSETS>                                     0                       0                       0
<INVESTMENTS-HELD-FOR-SALE>                    550,657                 523,324                 962,421
<INVESTMENTS-CARRYING>                         265,611                 271,918                 268,120
<INVESTMENTS-MARKET>                           263,840                 271,962                 269,326
<LOANS>                                      2,340,341               2,455,855               2,898,603
<ALLOWANCE>                                     30,026                  32,106                  40,093
<TOTAL-ASSETS>                               3,519,560               3,614,544               4,714,482
<DEPOSITS>                                   2,942,726               2,944,034               4,334,621
<SHORT-TERM>                                   155,332                 168,637                 185,276
<LIABILITIES-OTHER>                             40,553                  46,419                  56,718
<LONG-TERM>                                     27,576                  87,895                 129,958
<PREFERRED-MANDATORY>                           60,000                  60,000                  60,000
<PREFERRED>                                          0                       0                       0
<COMMON>                                           435                     438                     440
<OTHER-SE>                                     291,295                 305,378                 317,644
<TOTAL-LIABILITIES-AND-EQUITY>               3,519,560               3,614,544               4,714,482
<INTEREST-LOAN>                                 56,055                 115,139                 185,038
<INTEREST-INVEST>                               12,701                  25,317                  43,273
<INTEREST-OTHER>                                   427                   1,231                   2,183
<INTEREST-TOTAL>                                69,183                 141,687                 230,494
<INTEREST-DEPOSIT>                              24,673                  49,803                  83,395
<INTEREST-EXPENSE>                              27,596                  56,140                  94,206
<INTEREST-INCOME-NET>                           41,587                  85,547                 136,288
<LOAN-LOSSES>                                    1,372                   4,015                   5,928
<SECURITIES-GAINS>                                 (3)                      67                     126
<EXPENSE-OTHER>                                 30,193                  63,897                 104,417
<INCOME-PRETAX>                                 19,615                  39,824                  61,369
<INCOME-PRE-EXTRAORDINARY>                      13,651                  27,784                  42,760
<EXTRAORDINARY>                                    416                   1,027                   1,256
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                    14,067                  28,811                  44,016
<EPS-PRIMARY>                                      .34                     .68                    1.02
<EPS-DILUTED>                                      .32                     .66                     .99
<YIELD-ACTUAL>                                       0                       0                       0
<LOANS-NON>                                     10,580                  12,055                  14,228
<LOANS-PAST>                                     2,624                   1,991                   6,315
<LOANS-TROUBLED>                                   251                     204                     156
<LOANS-PROBLEM>                                      0                       0                       0
<ALLOWANCE-OPEN>                                30,165                  30,165                  30,165
<CHARGE-OFFS>                                    1,726                   2,889                   5,200
<RECOVERIES>                                       560                   1,160                   2,045
<ALLOWANCE-CLOSE>                               30,026                  32,016                  40,093
<ALLOWANCE-DOMESTIC>                                 0                       0                       0
<ALLOWANCE-FOREIGN>                                  0                       0                       0
<ALLOWANCE-UNALLOCATED>                              0                       0                       0
        

</TABLE>