<TABLE> <S> <C>

<PAGE>
<ARTICLE> 9
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEET OF CARLINVILLE NATIONAL BANK SHARES, INC. &
SUBSIDIARIES AS OF MARCH 31, 1999, & THE CONSOLIDATED STATEMENTS OF INCOME,
STOCKHOLDERS' EQUITY, & CASHFLOWS FOR THE THREE MONTHS ENDED MARCH 31, 1999 &
1998, & IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               MAR-31-1999
<CASH>                                       5,099,592
<INT-BEARING-DEPOSITS>                          70,507
<FED-FUNDS-SOLD>                            12,873,000
<TRADING-ASSETS>                                     0
<INVESTMENTS-HELD-FOR-SALE>                 69,754,264
<INVESTMENTS-CARRYING>                      10,776,329
<INVESTMENTS-MARKET>                        10,674,000
<LOANS>                                    152,377,397
<ALLOWANCE>                                  1,493,474
<TOTAL-ASSETS>                             263,550,252
<DEPOSITS>                                 225,823,875
<SHORT-TERM>                                 5,994,950
<LIABILITIES-OTHER>                          2,649,087
<LONG-TERM>                                  1,252,000
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       262,710
<OTHER-SE>                                  27,567,630
<TOTAL-LIABILITIES-AND-EQUITY>             263,550,252
<INTEREST-LOAN>                              3,308,544
<INTEREST-INVEST>                            1,090,792
<INTEREST-OTHER>                               189,463
<INTEREST-TOTAL>                             4,588,799
<INTEREST-DEPOSIT>                           2,315,673
<INTEREST-EXPENSE>                           2,426,537
<INTEREST-INCOME-NET>                        2,162,262
<LOAN-LOSSES>                                   45,000
<SECURITIES-GAINS>                              29,978
<EXPENSE-OTHER>                              1,725,271
<INCOME-PRETAX>                                832,529
<INCOME-PRE-EXTRAORDINARY>                     588,171
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   588,171
<EPS-PRIMARY>                                     2.36
<EPS-DILUTED>                                     2.36
<YIELD-ACTUAL>                                    7.70
<LOANS-NON>                                  1,257,000
<LOANS-PAST>                                   676,000
<LOANS-TROUBLED>                                     0
<LOANS-PROBLEM>                             15,145,000
<ALLOWANCE-OPEN>                             1,641,212
<CHARGE-OFFS>                                (212,447)
<RECOVERIES>                                    19,709
<ALLOWANCE-CLOSE>                            1,493,474
<ALLOWANCE-DOMESTIC>                         1,393,474
<ALLOWANCE-FOREIGN>                                  0
<ALLOWANCE-UNALLOCATED>                        100,000
        

</TABLE>