<TABLE> <S> <C>

<PAGE>

<ARTICLE> 9
<MULTIPLIER> 1,000

<S>                             <C>                     <C>
<PERIOD-TYPE>                   6-MOS                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999             DEC-31-1998
<PERIOD-START>                             JAN-01-1999             JAN-01-1998
<PERIOD-END>                               JUN-30-1999             JUN-30-1998
<CASH>                                         162,748                 205,789
<INT-BEARING-DEPOSITS>                          20,161                  19,140
<FED-FUNDS-SOLD>                                53,863                  17,088
<TRADING-ASSETS>                                82,666                  67,878
<INVESTMENTS-HELD-FOR-SALE>                    679,362                 687,151
<INVESTMENTS-CARRYING>                       1,692,493               1,131,779
<INVESTMENTS-MARKET>                         1,634,744               1,134,487
<LOANS>                                      3,416,997               2,887,453
<ALLOWANCE>                                     51,426                  45,050
<TOTAL-ASSETS>                               6,316,673               5,200,617
<DEPOSITS>                                   4,096,340               3,415,788
<SHORT-TERM>                                   708,149                 478,726
<LIABILITIES-OTHER>                            169,125                  86,429
<LONG-TERM>                                    780,021                 791,506
<PREFERRED-MANDATORY>                          513,135                 378,278
<PREFERRED>                                          0                       0
<COMMON>                                             0                       0
<OTHER-SE>                                           0                       0
<TOTAL-LIABILITIES-AND-EQUITY>               6,316,673               5,200,617
<INTEREST-LOAN>                                136,467                 123,036
<INTEREST-INVEST>                               71,585                  56,143
<INTEREST-OTHER>                                 3,662                   3,635
<INTEREST-TOTAL>                               211,714                 182,814
<INTEREST-DEPOSIT>                              70,157                  65,541
<INTEREST-EXPENSE>                             104,780                  90,890
<INTEREST-INCOME-NET>                          106,934                  91,924
<LOAN-LOSSES>                                    6,214                   3,497
<SECURITIES-GAINS>                             (2,033)                      45
<EXPENSE-OTHER>                                 71,926                  68,989
<INCOME-PRETAX>                                 72,634                  61,391
<INCOME-PRE-EXTRAORDINARY>                      72,634                  61,391
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                    48,895                  40,494
<EPS-BASIC>                                        .48                     .40
<EPS-DILUTED>                                      .47                     .40
<YIELD-ACTUAL>                                    4.09                    4.21
<LOANS-NON>                                        205                     543
<LOANS-PAST>                                     3,323                   3,050
<LOANS-TROUBLED>                                     0                       0
<LOANS-PROBLEM>                                    483                     175
<ALLOWANCE-OPEN>                                49,122                  43,297
<CHARGE-OFFS>                                    6,033                   5,507
<RECOVERIES>                                     2,123                   2,522
<ALLOWANCE-CLOSE>                               51,426                  45,050
<ALLOWANCE-DOMESTIC>                            51,426                  45,050
<ALLOWANCE-FOREIGN>                                  0                       0
<ALLOWANCE-UNALLOCATED>                              0                       0


</TABLE>