<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
SIX MONTH PERIOD FROM JANUARY 1, 1998 THROUGH JUNE 30, 1998 AND IS QUALIFIED IN
ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               JUN-30-1998
<CASH>                                       4,071,921
<INT-BEARING-DEPOSITS>                               0
<FED-FUNDS-SOLD>                                90,000
<TRADING-ASSETS>                                     0
<INVESTMENTS-HELD-FOR-SALE>                 10,848,586
<INVESTMENTS-CARRYING>                         180,000
<INVESTMENTS-MARKET>                                 0
<LOANS>                                     12,262,251
<ALLOWANCE>                                    135,954
<TOTAL-ASSETS>                              28,519,718
<DEPOSITS>                                  22,028,145
<SHORT-TERM>                                   560,000
<LIABILITIES-OTHER>                             30,971
<LONG-TERM>                                          0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       676,188
<OTHER-SE>                                   5,224,414
<TOTAL-LIABILITIES-AND-EQUITY>              28,519,718
<INTEREST-LOAN>                                390,994
<INTEREST-INVEST>                              293,702
<INTEREST-OTHER>                                81,147
<INTEREST-TOTAL>                               765,843
<INTEREST-DEPOSIT>                             378,528
<INTEREST-EXPENSE>                             379,068
<INTEREST-INCOME-NET>                          386,775
<LOAN-LOSSES>                                   90,581
<SECURITIES-GAINS>                                   0
<EXPENSE-OTHER>                                694,340
<INCOME-PRETAX>                               (349,750)
<INCOME-PRE-EXTRAORDINARY>                    (349,750)
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (349,750)
<EPS-PRIMARY>                                     (.52)
<EPS-DILUTED>                                     (.52)
<YIELD-ACTUAL>                                       0
<LOANS-NON>                                          0
<LOANS-PAST>                                         0
<LOANS-TROUBLED>                                     0
<LOANS-PROBLEM>                                      0
<ALLOWANCE-OPEN>                                     0
<CHARGE-OFFS>                                        0
<RECOVERIES>                                         0
<ALLOWANCE-CLOSE>                                    0
<ALLOWANCE-DOMESTIC>                                 0
<ALLOWANCE-FOREIGN>                                  0
<ALLOWANCE-UNALLOCATED>                              0
        

</TABLE>