<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 9
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998             DEC-31-1998
<PERIOD-START>                             APR-01-1998             JAN-01-1998
<PERIOD-END>                               JUN-30-1998             JUN-30-1998
<CASH>                                          11,680                  11,680
<INT-BEARING-DEPOSITS>                               0                       0
<FED-FUNDS-SOLD>                                14,000                  14,000
<TRADING-ASSETS>                                     0                       0
<INVESTMENTS-HELD-FOR-SALE>                    489,838                 489,838
<INVESTMENTS-CARRYING>                          24,346                  24,346
<INVESTMENTS-MARKET>                            24,411                  24,411
<LOANS>                                        644,385                 644,385
<ALLOWANCE>                                      6,758                   6,758
<TOTAL-ASSETS>                               1,221,038               1,221,038
<DEPOSITS>                                     807,591                 807,591
<SHORT-TERM>                                    11,544                  11,544
<LIABILITIES-OTHER>                             14,583                  14,583
<LONG-TERM>                                    128,000                 128,000
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                           317                     317
<OTHER-SE>                                     259,003                 259,003
<TOTAL-LIABILITIES-AND-EQUITY>               1,221,038               1,221,038
<INTEREST-LOAN>                                 12,135                  23,772
<INTEREST-INVEST>                                8,320                  15,300
<INTEREST-OTHER>                                     0                       0
<INTEREST-TOTAL>                                20,455                  39,072
<INTEREST-DEPOSIT>                               8,258                  16,723
<INTEREST-EXPENSE>                              10,095                  20,527
<INTEREST-INCOME-NET>                           10,360                  18,545
<LOAN-LOSSES>                                      365                     740
<SECURITIES-GAINS>                                  42                     149
<EXPENSE-OTHER>                                  4,518                   8,811
<INCOME-PRETAX>                                  6,158                  11,461
<INCOME-PRE-EXTRAORDINARY>                       6,158                  11,461
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                     3,879                   7,218
<EPS-PRIMARY>                                     0.13                    0.24
<EPS-DILUTED>                                     0.13                    0.23
<YIELD-ACTUAL>                                    3.57                    3.39
<LOANS-NON>                                      2,377                   2,377
<LOANS-PAST>                                       134                     134
<LOANS-TROUBLED>                                     0                       0
<LOANS-PROBLEM>                                      0                       0
<ALLOWANCE-OPEN>                                 6,406                   6,097
<CHARGE-OFFS>                                       16                      82
<RECOVERIES>                                         3                       3
<ALLOWANCE-CLOSE>                                6,758                   6,758
<ALLOWANCE-DOMESTIC>                               100                     100
<ALLOWANCE-FOREIGN>                                  0                       0
<ALLOWANCE-UNALLOCATED>                              0                       0
        

</TABLE>