<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, 1999, AND
THE RELATED STATEMENTS OF INCOME, CHANGES IN SHAREHOLDERS' EQUITY AND CASH FLOWS
FOR THE PERIOD ENDING JUNE 30, 1999 AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<CASH>                                          23,117
<INT-BEARING-DEPOSITS>                               0
<FED-FUNDS-SOLD>                                 8,980
<TRADING-ASSETS>                                     0
<INVESTMENTS-HELD-FOR-SALE>                    108,358
<INVESTMENTS-CARRYING>                         137,694
<INVESTMENTS-MARKET>                           137,533
<LOANS>                                        339,212
<ALLOWANCE>                                      4,895
<TOTAL-ASSETS>                                 524,331
<DEPOSITS>                                     453,898
<SHORT-TERM>                                    20,340
<LIABILITIES-OTHER>                              3,163
<LONG-TERM>                                          0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         8,067
<OTHER-SE>                                      38,863
<TOTAL-LIABILITIES-AND-EQUITY>                 524,331
<INTEREST-LOAN>                                 14,546
<INTEREST-INVEST>                                4,110
<INTEREST-OTHER>                                   459
<INTEREST-TOTAL>                                19,115
<INTEREST-DEPOSIT>                               6,094
<INTEREST-EXPENSE>                               6,411
<INTEREST-INCOME-NET>                           12,704
<LOAN-LOSSES>                                      638
<SECURITIES-GAINS>                                   0
<EXPENSE-OTHER>                                  7,416
<INCOME-PRETAX>                                  6,583
<INCOME-PRE-EXTRAORDINARY>                       4,307
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     4,307
<EPS-BASIC>                                        .67
<EPS-DILUTED>                                      .64
<YIELD-ACTUAL>                                    5.31
<LOANS-NON>                                      2,952
<LOANS-PAST>                                         0
<LOANS-TROUBLED>                                     0
<LOANS-PROBLEM>                                  9,755
<ALLOWANCE-OPEN>                                 4,724
<CHARGE-OFFS>                                      559
<RECOVERIES>                                        92
<ALLOWANCE-CLOSE>                                4,895
<ALLOWANCE-DOMESTIC>                             4,895
<ALLOWANCE-FOREIGN>                                  0
<ALLOWANCE-UNALLOCATED>                              0


</TABLE>