<TABLE> <S> <C>

<PAGE>
<ARTICLE> 9
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FINANCIAL
STATEMENTS FOR THE PERIOD ENDED DECEMBER 31, 1997 AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED>
<MULTIPLIER> 1,000

<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   12-MOS                   12-MOS                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1996             DEC-31-1995
<PERIOD-START>                             JAN-01-1997             JAN-01-1996             JAN-01-1995
<PERIOD-END>                               DEC-31-1997             DEC-31-1996             DEC-31-1995
<CASH>                                         128,647                 169,740                 150,621
<INT-BEARING-DEPOSITS>                          10,044                  12,253                  19,123
<FED-FUNDS-SOLD>                                     0                       0                 115,500
<TRADING-ASSETS>                                 1,178                   1,727                   1,790
<INVESTMENTS-HELD-FOR-SALE>                    840,469                 925,340                 978,361
<INVESTMENTS-CARRYING>                       1,176,164               1,683,908               1,761,692
<INVESTMENTS-MARKET>                         1,197,721               1,702,201               1,797,286
<LOANS>                                      2,867,256               2,448,474               2,329,127
<ALLOWANCE>                                     39,064                  37,840                  34,583
<TOTAL-ASSETS>                               5,319,570               5,417,877               5,567,059
<DEPOSITS>                                   4,023,106               3,821,906               3,808,273
<SHORT-TERM>                                   484,583                 774,678                 506,497
<LIABILITIES-OTHER>                             78,217                 106,532                 105,033
<LONG-TERM>                                    338,467                 354,710                 758,490
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                   2,342                   2,516
<COMMON>                                        14,327                  14,139                  14,095
<OTHER-SE>                                     320,870                 343,570                 372,155
<TOTAL-LIABILITIES-AND-EQUITY>               5,319,570               5,417,877               5,567,059
<INTEREST-LOAN>                                224,900                 201,394                 184,591
<INTEREST-INVEST>                              159,362                 170,003                 244,078
<INTEREST-OTHER>                                 1,428                   3,448                   2,790
<INTEREST-TOTAL>                               385,690                 374,845                 431,459
<INTEREST-DEPOSIT>                             170,837                 154,747                 157,415
<INTEREST-EXPENSE>                             229,591                 222,098                 278,944
<INTEREST-INCOME-NET>                          156,099                 152,747                 152,515
<LOAN-LOSSES>                                    7,168                   7,813                   6,790
<SECURITIES-GAINS>                              10,360                   6,018                   5,457
<EXPENSE-OTHER>                                109,345                 110,614                 103,462
<INCOME-PRETAX>                                 80,220                  70,582                  71,564
<INCOME-PRE-EXTRAORDINARY>                      51,178                  42,964                  40,155
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                    51,178                  42,964                  40,155
<EPS-PRIMARY>                                     3.93                    3.02                    2.88
<EPS-DILUTED>                                     3.88                    2.88                    2.76
<YIELD-ACTUAL>                                    7.49                    7.44                    7.20
<LOANS-NON>                                     23,400                  20,172                  23,580
<LOANS-PAST>                                     4,624                   2,464                   2,586
<LOANS-TROUBLED>                                 2,033                   4,441                   2,792
<LOANS-PROBLEM>                                 33,195                  20,833                  23,985
<ALLOWANCE-OPEN>                                37,840                  34,583                  33,775
<CHARGE-OFFS>                                    7,492                   6,638                   7,591
<RECOVERIES>                                     1,548                   2,082                   1,609
<ALLOWANCE-CLOSE>                               39,064                  37,840                  34,583
<ALLOWANCE-DOMESTIC>                            39,064                  37,840                  34,583
<ALLOWANCE-FOREIGN>                                  0                       0                       0
<ALLOWANCE-UNALLOCATED>                              0                       0                       0


</TABLE>