<TABLE> <S> <C>

<PAGE>
<ARTICLE> 9
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
FINANCIAL STATEMENTS OF ROCKDALE NATIONAL BANCSHARES, INC. (A DEVELOPMENT STAGE
CORPORATION) FOR THE PERIOD FROM INCEPTION (FEBRUARY 13, 1997) TO SEPTEMBER 30,
1997, AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
        
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               SEP-30-1997
<CASH>                                         536,925
<INT-BEARING-DEPOSITS>                         480,000
<FED-FUNDS-SOLD>                                     0
<TRADING-ASSETS>                                     0
<INVESTMENTS-HELD-FOR-SALE>                          0
<INVESTMENTS-CARRYING>                       4,201,010
<INVESTMENTS-MARKET>                                 0
<LOANS>                                              0
<ALLOWANCE>                                          0
<TOTAL-ASSETS>                               6,486,560
<DEPOSITS>                                           0
<SHORT-TERM>                                         0
<LIABILITIES-OTHER>                             15,898
<LONG-TERM>                                          0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       659,559
<OTHER-SE>                                   5,936,031
<TOTAL-LIABILITIES-AND-EQUITY>               6,436,560
<INTEREST-LOAN>                                      0
<INTEREST-INVEST>                               24,455
<INTEREST-OTHER>                                   197
<INTEREST-TOTAL>                                24,652
<INTEREST-DEPOSIT>                                   0
<INTEREST-EXPENSE>                              27,555
<INTEREST-INCOME-NET>                           (2,903)
<LOAN-LOSSES>                                        0
<SECURITIES-GAINS>                                   0
<EXPENSE-OTHER>                                122,025
<INCOME-PRETAX>                               (124,928)
<INCOME-PRE-EXTRAORDINARY>                     124,928
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (124,928)
<EPS-PRIMARY>                                     (.30)
<EPS-DILUTED>                                     (.30)
<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>