<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 9
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM UNAUDITED
INTERIM FINANCIAL STATEMENTS AS OF AND FOR THE THREE MONTHS ENDED SEPTEMBER 30,
1998 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          JUN-30-1999
<PERIOD-START>                             JUL-01-1998
<PERIOD-END>                               SEP-30-1998
<CASH>                                         158,570
<INT-BEARING-DEPOSITS>                               0
<FED-FUNDS-SOLD>                                17,800
<TRADING-ASSETS>                                     0
<INVESTMENTS-HELD-FOR-SALE>                    288,786
<INVESTMENTS-CARRYING>                       1,250,059
<INVESTMENTS-MARKET>                         1,256,423
<LOANS>                                      8,616,935
<ALLOWANCE>                                     72,516
<TOTAL-ASSETS>                              11,083,412
<DEPOSITS>                                   7,275,914
<SHORT-TERM>                                   892,000
<LIABILITIES-OTHER>                            175,624
<LONG-TERM>                                  1,826,713
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           604
<OTHER-SE>                                     912,557
<TOTAL-LIABILITIES-AND-EQUITY>              11,083,412
<INTEREST-LOAN>                                168,470
<INTEREST-INVEST>                               30,391
<INTEREST-OTHER>                                     0
<INTEREST-TOTAL>                               198,861
<INTEREST-DEPOSIT>                              81,707
<INTEREST-EXPENSE>                             124,241
<INTEREST-INCOME-NET>                           74,620
<LOAN-LOSSES>                                    3,800
<SECURITIES-GAINS>                               1,688
<EXPENSE-OTHER>                                 69,201
<INCOME-PRETAX>                                 28,553
<INCOME-PRE-EXTRAORDINARY>                      15,123
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    15,123
<EPS-PRIMARY>                                      .26
<EPS-DILUTED>                                      .25
<YIELD-ACTUAL>                                    2.89
<LOANS-NON>                                     55,296
<LOANS-PAST>                                         0
<LOANS-TROUBLED>                                 6,256
<LOANS-PROBLEM>                                      0
<ALLOWANCE-OPEN>                                64,757
<CHARGE-OFFS>                                    3,218
<RECOVERIES>                                       602
<ALLOWANCE-CLOSE>                               72,516
<ALLOWANCE-DOMESTIC>                             7,899
<ALLOWANCE-FOREIGN>                                  0
<ALLOWANCE-UNALLOCATED>                         64,617
        

</TABLE>