<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
NINE-MONTH PERIOD FROM JANUARY 1, 2000 THROUGH SEPTEMBER 30, 2000 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>

<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               SEP-30-2000
<CASH>                                       5,244,580
<INT-BEARING-DEPOSITS>                         166,345
<FED-FUNDS-SOLD>                               200,000
<TRADING-ASSETS>                                     0
<INVESTMENTS-HELD-FOR-SALE>                 10,295,469
<INVESTMENTS-CARRYING>                      10,295,469
<INVESTMENTS-MARKET>                        10,295,469
<LOANS>                                     47,487,176
<ALLOWANCE>                                  (699,086)
<TOTAL-ASSETS>                              66,714,913
<DEPOSITS>                                  57,732,866
<SHORT-TERM>                                         0
<LIABILITIES-OTHER>                            129,299
<LONG-TERM>                                  2,500,000
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       676,188
<OTHER-SE>                                   5,604,750
<TOTAL-LIABILITIES-AND-EQUITY>              66,714,913
<INTEREST-LOAN>                              3,242,006
<INTEREST-INVEST>                              488,943
<INTEREST-OTHER>                               216,317
<INTEREST-TOTAL>                             3,947,266
<INTEREST-DEPOSIT>                           1,651,047
<INTEREST-EXPENSE>                             120,816
<INTEREST-INCOME-NET>                        2,175,403
<LOAN-LOSSES>                                  196,787
<SECURITIES-GAINS>                                   0
<EXPENSE-OTHER>                                160,500
<INCOME-PRETAX>                                726,834
<INCOME-PRE-EXTRAORDINARY>                     726,834
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    726,83
<EPS-BASIC>                                       1.07
<EPS-DILUTED>                                     0.96
<YIELD-ACTUAL>                                    5.80
<LOANS-NON>                                          0
<LOANS-PAST>                                    16,003
<LOANS-TROUBLED>                                     0
<LOANS-PROBLEM>                                 16,003
<ALLOWANCE-OPEN>                               658,421
<CHARGE-OFFS>                                   36,829
<RECOVERIES>                                         0
<ALLOWANCE-CLOSE>                              699,086
<ALLOWANCE-DOMESTIC>                           699,086
<ALLOWANCE-FOREIGN>                                  0
<ALLOWANCE-UNALLOCATED>                        652,073



</TABLE>