<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 JUNE 30, 2000, AND
THE RELATED STATEMENTS OF INCOME, CHANGES IN SHAREHOLDERS' EQUITY AND CASH FLOWS
FOR THE PERIOD ENDING JUNE 30, 2000 AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               JUN-30-2000
<CASH>                                         $27,577
<INT-BEARING-DEPOSITS>                             475
<FED-FUNDS-SOLD>                                18,770
<TRADING-ASSETS>                                     0
<INVESTMENTS-HELD-FOR-SALE>                    121,769
<INVESTMENTS-CARRYING>                         145,798
<INVESTMENTS-MARKET>                           145,165
<LOANS>                                        377,641
<ALLOWANCE>                                      6,899
<TOTAL-ASSETS>                                 585,371
<DEPOSITS>                                     503,221
<SHORT-TERM>                                    29,052
<LIABILITIES-OTHER>                              3,065
<LONG-TERM>                                          0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         7,976
<OTHER-SE>                                      42,057
<TOTAL-LIABILITIES-AND-EQUITY>                 585,371
<INTEREST-LOAN>                                 17,718
<INTEREST-INVEST>                                4,580
<INTEREST-OTHER>                                   403
<INTEREST-TOTAL>                                22,701
<INTEREST-DEPOSIT>                               7,813
<INTEREST-EXPENSE>                               8,534
<INTEREST-INCOME-NET>                           14,179
<LOAN-LOSSES>                                    1,728
<SECURITIES-GAINS>                                   0
<EXPENSE-OTHER>                                  8,442
<INCOME-PRETAX>                                  5,823
<INCOME-PRE-EXTRAORDINARY>                       3,797
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     3,797
<EPS-BASIC>                                        .60
<EPS-DILUTED>                                      .58
<YIELD-ACTUAL>                                    5.37
<LOANS-NON>                                      5,440
<LOANS-PAST>                                         0
<LOANS-TROUBLED>                                     0
<LOANS-PROBLEM>                                 13,064
<ALLOWANCE-OPEN>                                 5,169
<CHARGE-OFFS>                                      126
<RECOVERIES>                                       128
<ALLOWANCE-CLOSE>                                6,899
<ALLOWANCE-DOMESTIC>                             6,899
<ALLOWANCE-FOREIGN>                                  0
<ALLOWANCE-UNALLOCATED>                              0


</TABLE>