<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, 1999 THROUGH JUNE 30, 1999 AND IS QUALIFIED IN
ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<CASH>                                       2,550,305
<INT-BEARING-DEPOSITS>                      30,448,921
<FED-FUNDS-SOLD>                                     0
<TRADING-ASSETS>                                     0
<INVESTMENTS-HELD-FOR-SALE>                          0
<INVESTMENTS-CARRYING>                               0
<INVESTMENTS-MARKET>                        10,747,612
<LOANS>                                     28,162,565
<ALLOWANCE>                                   (360,901)
<TOTAL-ASSETS>                              44,802,590
<DEPOSITS>                                  37,910,410
<SHORT-TERM>                                 1,360,000
<LIABILITIES-OTHER>                            108,861
<LONG-TERM>                                          0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       676,188
<OTHER-SE>                                   4,747,131
<TOTAL-LIABILITIES-AND-EQUITY>              44,802,590
<INTEREST-LOAN>                              1,001,522
<INTEREST-INVEST>                              290,378
<INTEREST-OTHER>                                65,611
<INTEREST-TOTAL>                             1,357,511
<INTEREST-DEPOSIT>                             529,564
<INTEREST-EXPENSE>                             533,086
<INTEREST-INCOME-NET>                          824,425
<LOAN-LOSSES>                                  166,320
<SECURITIES-GAINS>                                 462
<EXPENSE-OTHER>                                906,911
<INCOME-PRETAX>                               (118,508)
<INCOME-PRE-EXTRAORDINARY>                    (118,508)
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (118,508)
<EPS-BASIC>                                       (.18)
<EPS-DILUTED>                                     (.18)
<YIELD-ACTUAL>                                    4.78
<LOANS-NON>                                          0
<LOANS-PAST>                                         0
<LOANS-TROUBLED>                                     0
<LOANS-PROBLEM>                                      0
<ALLOWANCE-OPEN>                               194,581
<CHARGE-OFFS>                                        0
<RECOVERIES>                                         0
<ALLOWANCE-CLOSE>                              360,901
<ALLOWANCE-DOMESTIC>                                 0
<ALLOWANCE-FOREIGN>                                  0
<ALLOWANCE-UNALLOCATED>                        360,901


</TABLE>