<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, 2000 THROUGH JUNE 30, 2000 AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               JUN-30-2000
<CASH>                                       4,225,044
<INT-BEARING-DEPOSITS>                         161,243
<FED-FUNDS-SOLD>                             5,090,000
<TRADING-ASSETS>                                     0
<INVESTMENTS-HELD-FOR-SALE>                          0
<INVESTMENTS-CARRYING>                               0
<INVESTMENTS-MARKET>                        10,496,241
<LOANS>                                     44,425,997
<ALLOWANCE>                                    658,421
<TOTAL-ASSETS>                              67,616,387
<DEPOSITS>                                  59,091,130
<SHORT-TERM>                                         0
<LIABILITIES-OTHER>                            163,253
<LONG-TERM>                                  2,500,000
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       676,188
<OTHER-SE>                                   5,185,816
<TOTAL-LIABILITIES-AND-EQUITY>              67,616,387
<INTEREST-LOAN>                              2,053,110
<INTEREST-INVEST>                              323,052
<INTEREST-OTHER>                               128,215
<INTEREST-TOTAL>                             2,504,377
<INTEREST-DEPOSIT>                           1,041,047
<INTEREST-EXPENSE>                              77,680
<INTEREST-INCOME-NET>                        1,385,650
<LOAN-LOSSES>                                  119,392
<SECURITIES-GAINS>                                   0
<EXPENSE-OTHER>                              1,075,653
<INCOME-PRETAX>                                436,987
<INCOME-PRE-EXTRAORDINARY>                     436,987
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   436,987
<EPS-BASIC>                                        .65
<EPS-DILUTED>                                      .58
<YIELD-ACTUAL>                                    4.80
<LOANS-NON>                                          0
<LOANS-PAST>                                         0
<LOANS-TROUBLED>                                     0
<LOANS-PROBLEM>                                      0
<ALLOWANCE-OPEN>                               119,392
<CHARGE-OFFS>                                    9,456
<RECOVERIES>                                    17,461
<ALLOWANCE-CLOSE>                              531,024
<ALLOWANCE-DOMESTIC>                                 0
<ALLOWANCE-FOREIGN>                                  0
<ALLOWANCE-UNALLOCATED>                              0



</TABLE>