<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 9
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998             DEC-31-1998
<PERIOD-START>                             JUL-01-1998             JAN-01-1998
<PERIOD-END>                               SEP-30-1998             SEP-30-1998
<CASH>                                          15,263                  15,263
<INT-BEARING-DEPOSITS>                               0                       0
<FED-FUNDS-SOLD>                                 1,675                   1,675
<TRADING-ASSETS>                                     0                       0
<INVESTMENTS-HELD-FOR-SALE>                    506,424                 506,424
<INVESTMENTS-CARRYING>                          12,994                  12,994
<INVESTMENTS-MARKET>                            14,988                  14,988
<LOANS>                                        681,962                 681,962
<ALLOWANCE>                                      7,064                   7,064
<TOTAL-ASSETS>                               1,262,151               1,262,151
<DEPOSITS>                                     809,696                 809,696
<SHORT-TERM>                                     1,000                   1,000
<LIABILITIES-OTHER>                             15,946                  15,946
<LONG-TERM>                                    172,000                 172,000
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                           318                     318
<OTHER-SE>                                     263,191                 263,191
<TOTAL-LIABILITIES-AND-EQUITY>               1,262,151               1,262,151
<INTEREST-LOAN>                                 12,781                  36,553
<INTEREST-INVEST>                                8,014                  23,314
<INTEREST-OTHER>                                     0                       0
<INTEREST-TOTAL>                                20,795                  59,867
<INTEREST-DEPOSIT>                               8,370                  25,093
<INTEREST-EXPENSE>                              10,529                  31,056
<INTEREST-INCOME-NET>                           10,266                  28,811
<LOAN-LOSSES>                                      352                   1,092
<SECURITIES-GAINS>                                 372                     521
<EXPENSE-OTHER>                                  4,758                  13,569
<INCOME-PRETAX>                                  6,164                  17,625
<INCOME-PRE-EXTRAORDINARY>                       6,164                  17,625
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                     4,228                  11,446
<EPS-PRIMARY>                                     0.14                    0.38
<EPS-DILUTED>                                     0.14                    0.37
<YIELD-ACTUAL>                                    3.43                    3.41
<LOANS-NON>                                      2,454                   2,454
<LOANS-PAST>                                       186                     186
<LOANS-TROUBLED>                                     0                       0
<LOANS-PROBLEM>                                      0                       0
<ALLOWANCE-OPEN>                                 6,758                   6,097
<CHARGE-OFFS>                                       70                     152
<RECOVERIES>                                        24                      27
<ALLOWANCE-CLOSE>                                7,064                   7,064
<ALLOWANCE-DOMESTIC>                               100                     100
<ALLOWANCE-FOREIGN>                                  0                       0
<ALLOWANCE-UNALLOCATED>                              0                       0
        

</TABLE>