<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 9
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM UNAUDITED
RESTATED INTERIM FINANCIAL STATEMENTS AS OF AND FOR THE SIX MONTHS ENDED
DECEMBER 31, 1997 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JUN-30-1998
<PERIOD-START>                             JUL-01-1997
<PERIOD-END>                               DEC-31-1997
<CASH>                                         131,611
<INT-BEARING-DEPOSITS>                               0
<FED-FUNDS-SOLD>                                 8,100
<TRADING-ASSETS>                                     0
<INVESTMENTS-HELD-FOR-SALE>                    415,536
<INVESTMENTS-CARRYING>                       1,539,890
<INVESTMENTS-MARKET>                         1,542,799
<LOANS>                                      7,605,706
<ALLOWANCE>                                     64,250
<TOTAL-ASSETS>                              10,215,504
<DEPOSITS>                                   6,590,103
<SHORT-TERM>                                 1,555,336
<LIABILITIES-OTHER>                            160,600
<LONG-TERM>                                  1,115,261
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           574
<OTHER-SE>                                     793,630
<TOTAL-LIABILITIES-AND-EQUITY>              10,215,504
<INTEREST-LOAN>                                307,229
<INTEREST-INVEST>                               70,569
<INTEREST-OTHER>                                     0
<INTEREST-TOTAL>                               377,798
<INTEREST-DEPOSIT>                             159,163
<INTEREST-EXPENSE>                             241,537
<INTEREST-INCOME-NET>                          136,261
<LOAN-LOSSES>                                    7,647
<SECURITIES-GAINS>                               2,308
<EXPENSE-OTHER>                                 99,415
<INCOME-PRETAX>                                 80,476
<INCOME-PRE-EXTRAORDINARY>                      51,410
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    51,410
<EPS-PRIMARY>                                      .93
<EPS-DILUTED>                                      .90
<YIELD-ACTUAL>                                    2.82
<LOANS-NON>                                     48,481
<LOANS-PAST>                                         0
<LOANS-TROUBLED>                                 5,891
<LOANS-PROBLEM>                                      0
<ALLOWANCE-OPEN>                                61,261
<CHARGE-OFFS>                                    7,580
<RECOVERIES>                                     3,421
<ALLOWANCE-CLOSE>                               64,250
<ALLOWANCE-DOMESTIC>                             9,631
<ALLOWANCE-FOREIGN>                                  0
<ALLOWANCE-UNALLOCATED>                         54,619
        

</TABLE>