<TABLE> <S> <C>

<PAGE>

<ARTICLE> 9
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM CONSOLIDATED
STATEMENT OF CONDITION, THE CONSOLIDATED STATEMENT OF EARNINGS, THE CONSOLIDATED
STATEMENT OF CASH FLOWS OF ITEM 1 OF PART I AND TABLES 2, 6, 7, AND 8 OF ITEM 2
OF PART I OF THE AMSOUTH BANCORPORATION FORM 10-Q FOR THE NINE MONTHS ENDED
SEPTEMBER 30, 2000.
</LEGEND>
<RESTATED>
<MULTIPLIER> 1,000

<S>                             <C>                          <C>
<PERIOD-TYPE>                   9-MOS                        9-MOS
<FISCAL-YEAR-END>                          DEC-31-2000       DEC-31-1999
<PERIOD-START>                             JAN-01-2000       JAN-01-1999
<PERIOD-END>                               SEP-30-2000       SEP-30-1999
<CASH>                                       1,182,521         1,493,199
<INT-BEARING-DEPOSITS>                               0                 0
<FED-FUNDS-SOLD>                               205,465           185,705
<TRADING-ASSETS>                                13,079            75,728
<INVESTMENTS-HELD-FOR-SALE>                  1,939,431         8,197,989
<INVESTMENTS-CARRYING>                       6,754,735         4,703,929
<INVESTMENTS-MARKET>                         6,620,957         4,597,159
<LOANS>                                     24,481,792        26,255,232
<ALLOWANCE>                                    377,344           365,427
<TOTAL-ASSETS>                              39,395,701        43,425,019
<DEPOSITS>                                  26,790,431        27,399,600
<SHORT-TERM>                                 3,087,233         5,966,118
<LIABILITIES-OTHER>                            761,610           611,732
<LONG-TERM>                                  5,994,741         6,272,512
<PREFERRED-MANDATORY>                                0                 0
<PREFERRED>                                          0                 0
<COMMON>                                       416,949           417,804
<OTHER-SE>                                   2,344,737         2,757,253
<TOTAL-LIABILITIES-AND-EQUITY>              39,395,701        43,425,019
<INTEREST-LOAN>                              1,699,559         1,565,671
<INTEREST-INVEST>                              638,098           572,975
<INTEREST-OTHER>                                12,672            18,763
<INTEREST-TOTAL>                             2,350,329         2,157,409
<INTEREST-DEPOSIT>                             776,490           663,327
<INTEREST-EXPENSE>                           1,291,342         1,030,724
<INTEREST-INCOME-NET>                        1,058,987         1,126,685
<LOAN-LOSSES>                                  172,000            67,927
<SECURITIES-GAINS>                            (98,280)             5,688
<EXPENSE-OTHER>                              1,082,151         1,068,092
<INCOME-PRETAX>                                274,824           622,414
<INCOME-PRE-EXTRAORDINARY>                     274,824           622,414
<EXTRAORDINARY>                                      0                 0
<CHANGES>                                            0                 0
<NET-INCOME>                                   202,568           403,022
<EPS-BASIC>                                       0.53              1.03
<EPS-DILUTED>                                     0.52              1.02
<YIELD-ACTUAL>                                    3.66              4.08
<LOANS-NON>                                    146,069           161,843
<LOANS-PAST>                                    78,314            44,644
<LOANS-TROUBLED>                                     0                 0
<LOANS-PROBLEM>                                      0                 0
<ALLOWANCE-OPEN>                               363,476           373,756
<CHARGE-OFFS>                                  123,167           108,929
<RECOVERIES>                                    39,626            32,673
<ALLOWANCE-CLOSE>                              377,344           365,427
<ALLOWANCE-DOMESTIC>                           377,344           365,427
<ALLOWANCE-FOREIGN>                                  0                 0
<ALLOWANCE-UNALLOCATED>                              0                 0


</TABLE>