<TABLE> <S> <C>

<PAGE>
<ARTICLE> 9
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEETS OF SUMMIT BANCSHARES, INC. AS OF SEPTEMBER 30, 2000
AND THE RELATED STATEMENTS OF INCOME, CHANGES IN SHAREHOLDERS' EQUITY AND CASH
FLOWS FOR THE PERIOD ENDING SEPTEMBER 30, 2000 AND IS QUALIFIED IN ITS ENTIRETY
BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               SEP-30-2000
<CASH>                                          26,614
<INT-BEARING-DEPOSITS>                             535
<FED-FUNDS-SOLD>                                28,630
<TRADING-ASSETS>                                     0
<INVESTMENTS-HELD-FOR-SALE>                    123,882
<INVESTMENTS-CARRYING>                         146,907
<INVESTMENTS-MARKET>                           146,555
<LOANS>                                        379,259
<ALLOWANCE>                                      6,918
<TOTAL-ASSETS>                                 596,302
<DEPOSITS>                                     521,597
<SHORT-TERM>                                    18,671
<LIABILITIES-OTHER>                              3,426
<LONG-TERM>                                          0
<PREFERRED-MANDATORY>                            7,943
<PREFERRED>                                          0
<COMMON>                                             0
<OTHER-SE>                                      44,665
<TOTAL-LIABILITIES-AND-EQUITY>                 596,302
<INTEREST-LOAN>                                 27,178
<INTEREST-INVEST>                                6,906
<INTEREST-OTHER>                                   847
<INTEREST-TOTAL>                                34,931
<INTEREST-DEPOSIT>                              12,381
<INTEREST-EXPENSE>                              13,519
<INTEREST-INCOME-NET>                           21,412
<LOAN-LOSSES>                                    2,305
<SECURITIES-GAINS>                                   0
<EXPENSE-OTHER>                                 12,150
<INCOME-PRETAX>                                  9,701
<INCOME-PRE-EXTRAORDINARY>                       6,337
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     6,337
<EPS-BASIC>                                       1.00
<EPS-DILUTED>                                     0.97
<YIELD-ACTUAL>                                    5.31
<LOANS-NON>                                      5,273
<LOANS-PAST>                                         0
<LOANS-TROUBLED>                                     0
<LOANS-PROBLEM>                                 16,562
<ALLOWANCE-OPEN>                                 5,169
<CHARGE-OFFS>                                      758
<RECOVERIES>                                       202
<ALLOWANCE-CLOSE>                                6,918
<ALLOWANCE-DOMESTIC>                             6,918
<ALLOWANCE-FOREIGN>                                  0
<ALLOWANCE-UNALLOCATED>                              0


</TABLE>