<TABLE> <S> <C>

<PAGE>
<ARTICLE> 9
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   3-MOS
<FISCAL-YEAR-END>                          JUN-30-1998             MAR-31-1998
<PERIOD-START>                             APR-01-1998             JAN-01-1998
<PERIOD-END>                               JUN-30-1998             MAR-31-1998
<CASH>                                      35,195,951              69,872,153
<INT-BEARING-DEPOSITS>                               0                       0
<FED-FUNDS-SOLD>                            35,000,000              50,000,000
<TRADING-ASSETS>                                     0                       0
<INVESTMENTS-HELD-FOR-SALE>                489,749,346             462,081,710
<INVESTMENTS-CARRYING>                     955,143,294             890,541,133
<INVESTMENTS-MARKET>                       963,295,155             897,903,949
<LOANS>                                     69,889,107              78,329,537
<ALLOWANCE>                                    100,000                 100,000
<TOTAL-ASSETS>                           1,643,676,060           1,601,165,068
<DEPOSITS>                                 962,033,587             800,652,692
<SHORT-TERM>                               561,845,785             682,405,433
<LIABILITIES-OTHER>                         13,849,693              15,070,713
<LONG-TERM>                                          0                       0
<PREFERRED-MANDATORY>                       24,175,256              24,168,180
<PREFERRED>                                          0                       0
<COMMON>                                        67,059                  66,791
<OTHER-SE>                                  81,704,680              78,801,299
<TOTAL-LIABILITIES-AND-EQUITY>           1,643,676,060           1,601,165,068
<INTEREST-LOAN>                                846,834                 668,706
<INTEREST-INVEST>                           20,122,863              20,311,580
<INTEREST-OTHER>                                     0                       0
<INTEREST-TOTAL>                            20,969,697              20,980,286
<INTEREST-DEPOSIT>                           6,773,104               5,651,354
<INTEREST-EXPENSE>                          15,177,451              13,856,161
<INTEREST-INCOME-NET>                        5,792,246               7,124,125
<LOAN-LOSSES>                                        0                       0
<SECURITIES-GAINS>                             270,639                 200,427
<EXPENSE-OTHER>                             23,564,795              23,677,108
<INCOME-PRETAX>                              6,249,409               5,659,609
<INCOME-PRE-EXTRAORDINARY>                   6,249,409               5,659,609
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                 3,535,626               3,211,661
<EPS-PRIMARY>                                     0.53                    0.48
<EPS-DILUTED>                                     0.51                    0.47
<YIELD-ACTUAL>                                    1.84                    2.08
<LOANS-NON>                                          0                       0
<LOANS-PAST>                                         0                       0
<LOANS-TROUBLED>                                     0                       0
<LOANS-PROBLEM>                                      0                       0
<ALLOWANCE-OPEN>                               100,000                 100,000
<CHARGE-OFFS>                                        0                       0
<RECOVERIES>                                         0                       0
<ALLOWANCE-CLOSE>                              100,000                 100,000
<ALLOWANCE-DOMESTIC>                           100,000                 100,000
<ALLOWANCE-FOREIGN>                                  0                       0
<ALLOWANCE-UNALLOCATED>                              0                       0
        

</TABLE>