<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. AND
SUBSIDIARIES AS OF SEPTEMBER 30, 1999 AND THE CONSOLIDATED STATEMENTS OF INCOME
AND COMPREHENSIVE INCOME, STOCKHOLDERS' EQUITY, AND FLOWS FOR THE THREE AND NINE
MONTHS ENDED SEPTEMBER 30, 1999 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
</LEGEND>

<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1999             DEC-31-1999
<PERIOD-START>                             JUL-01-1999             JAN-01-1999
<PERIOD-END>                               SEP-30-1999             SEP-30-1999
<CASH>                                       7,553,251               7,553,251
<INT-BEARING-DEPOSITS>                          74,901                  74,901
<FED-FUNDS-SOLD>                               994,000                 994,000
<TRADING-ASSETS>                                     0                       0
<INVESTMENTS-HELD-FOR-SALE>                 69,065,575              69,065,575
<INVESTMENTS-CARRYING>                       9,325,294               9,325,294
<INVESTMENTS-MARKET>                         9,276,000               9,276,000
<LOANS>                                    159,983,124             159,983,124
<ALLOWANCE>                                  1,375,812               1,375,812
<TOTAL-ASSETS>                             260,584,724             260,584,724
<DEPOSITS>                                 219,650,674             219,650,674
<SHORT-TERM>                                 8,520,962               8,520,962
<LIABILITIES-OTHER>                          2,515,761               2,515,761
<LONG-TERM>                                  2,502,000               2,502,000
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                       262,710                 262,710
<OTHER-SE>                                  27,132,617              27,132,617
<TOTAL-LIABILITIES-AND-EQUITY>             260,584,724             260,584,724
<INTEREST-LOAN>                              3,492,021              10,085,620
<INTEREST-INVEST>                            1,172,419               3,421,179
<INTEREST-OTHER>                                98,940                 439,116
<INTEREST-TOTAL>                             4,763,380              13,945,915
<INTEREST-DEPOSIT>                           2,301,803               6,937,103
<INTEREST-EXPENSE>                           2,428,268               7,282,857
<INTEREST-INCOME-NET>                        2,335,112               6,663,058
<LOAN-LOSSES>                                   60,000                 390,000
<SECURITIES-GAINS>                             186,370                 216,348
<EXPENSE-OTHER>                              1,768,897               5,349,950
<INCOME-PRETAX>                              1,210,062               2,433,912
<INCOME-PRE-EXTRAORDINARY>                     895,069               1,742,190
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                   895,069               1,742,190
<EPS-BASIC>                                       3.62                    7.03
<EPS-DILUTED>                                     3.62                    7.03
<YIELD-ACTUAL>                                    3.98                    3.74
<LOANS-NON>                                  4,058,000               4,058,000
<LOANS-PAST>                                    96,000                  96,000
<LOANS-TROUBLED>                                     0                       0
<LOANS-PROBLEM>                             15,145,000              15,145,000
<ALLOWANCE-OPEN>                             1,325,813               1,641,212
<CHARGE-OFFS>                                  153,485                 859,297
<RECOVERIES>                                   143,484                 203,897
<ALLOWANCE-CLOSE>                            1,375,812               1,375,812
<ALLOWANCE-DOMESTIC>                         1,275,812               1,275,812
<ALLOWANCE-FOREIGN>                                  0                       0
<ALLOWANCE-UNALLOCATED>                        100,000                 100,000


</TABLE>