<TABLE> <S> <C>

<PAGE>
<ARTICLE> 9
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED FINANCIAL STATEMENTS OF ROCKDALE NATIONAL BANCSHARES, INC. FOR THE
THREE-MONTH PERIOD FROM JANUARY 1, 1999 THROUGH MARCH 31, 1999 AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
       
<S>                                        <C>
<PERIOD-TYPE>                                 3-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               MAR-31-1999
<CASH>                                       3,409,249
<INT-BEARING-DEPOSITS>                               0
<FED-FUNDS-SOLD>                             2,550,000
<TRADING-ASSETS>                                     0
<INVESTMENTS-HELD-FOR-SALE>                 10,644,664
<INVESTMENTS-CARRYING>                      10,644,664
<INVESTMENTS-MARKET>                                 0
<LOANS>                                     21,308,387
<ALLOWANCE>                                    259,449
<TOTAL-ASSETS>                              40,719,533
<DEPOSITS>                                  35,026,027
<SHORT-TERM>                                         0
<LIABILITIES-OTHER>                             85,433
<LONG-TERM>                                          0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       676,188
<OTHER-SE>                                   4,931,885
<TOTAL-LIABILITIES-AND-EQUITY>              40,719,533
<INTEREST-LOAN>                                433,943
<INTEREST-INVEST>                              144,635
<INTEREST-OTHER>                                50,223
<INTEREST-TOTAL>                               628,801
<INTEREST-DEPOSIT>                             240,612
<INTEREST-EXPENSE>                             240,612
<INTEREST-INCOME-NET>                          388,189
<LOAN-LOSSES>                                   64,867
<SECURITIES-GAINS>                                   0
<EXPENSE-OTHER>                                405,006
<INCOME-PRETAX>                                (29,858)
<INCOME-PRE-EXTRAORDINARY>                           0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (29,858)
<EPS-PRIMARY>                                     (.04)
<EPS-DILUTED>                                     (.04)
<YIELD-ACTUAL>                                    4.65
<LOANS-NON>                                          0
<LOANS-PAST>                                         0
<LOANS-TROUBLED>                                     0
<LOANS-PROBLEM>                                      0
<ALLOWANCE-OPEN>                                19,581
<CHARGE-OFFS>                                        0
<RECOVERIES>                                         0
<ALLOWANCE-CLOSE>                              259,444
<ALLOWANCE-DOMESTIC>                                 0
<ALLOWANCE-FOREIGN>                                  0
<ALLOWANCE-UNALLOCATED>                              0
        

</TABLE>