<TABLE> <S> <C>

<PAGE>
<ARTICLE> 9
<RESTATED> 
       
<S>                             <C>                     <C>                     <C>                     <C>
<PERIOD-TYPE>                   YEAR                   3-MOS                   3-MOS                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-START>                             JAN-01-1997             JAN-01-1997             JAN-01-1997             JAN-01-1997
<PERIOD-END>                               DEC-31-1997             MAR-31-1997             JUN-30-1997             SEP-30-1997
<CASH>                                      17,037,568              23,082,951               9,570,008              25,029,586
<INT-BEARING-DEPOSITS>                               0                       0                       0                       0
<FED-FUNDS-SOLD>                            75,000,000                       0              63,000,000                       0
<TRADING-ASSETS>                                     0                       0                       0                       0
<INVESTMENTS-HELD-FOR-SALE>                462,850,089             304,235,614             324,279,511             460,284,597
<INVESTMENTS-CARRYING>                     802,046,077             652,449,979             716,907,576             749,448,367
<INVESTMENTS-MARKET>                       809,708,389             640,999,603             719,500,877             757,781,734
<LOANS>                                     56,044,957              76,708,227             102,527,199              47,503,504
<ALLOWANCE>                                    100,000                 100,000                 100,000                 100,000
<TOTAL-ASSETS>                           1,459,344,205           1,094,289,621           1,256,676,036           1,332,357,450
<DEPOSITS>                                 846,739,932             623,790,739             740,951,179             551,694,613
<SHORT-TERM>                               499,932,628             365,181,507             409,123,917             672,444,101
<LIABILITIES-OTHER>                         13,609,660              16,349,003              13,731,989              12,300,082
<LONG-TERM>                                          0                       0                       0                       0
<PREFERRED-MANDATORY>                       24,161,104              24,244,743              24,216,332              24,166,257
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                        64,703                  64,453                  64,455                  64,456
<OTHER-SE>                                  74,836,178              64,659,176              68,588,164              71,679,931
<TOTAL-LIABILITIES-AND-EQUITY>           1,459,344,205           1,094,289,621           1,256,676,036           1,332,357,450
<INTEREST-LOAN>                              2,566,321                 664,409                 675,886                 570,264
<INTEREST-INVEST>                           70,469,608              14,367,193              16,316,033              18,547,320
<INTEREST-OTHER>                                     0                       0                       0                       0
<INTEREST-TOTAL>                            73,035,929              15,031,602              16,316,033              19,117,584
<INTEREST-DEPOSIT>                          18,722,500               4,445,602               5,014,000               4,400,706
<INTEREST-EXPENSE>                          46,863,231               8,575,466              10,402,357              13,020,232
<INTEREST-INCOME-NET>                       26,172,698               6,456,136               6,589,562               6,097,352
<LOAN-LOSSES>                                        0                       0                       0                       0
<SECURITIES-GAINS>                             113,958                       0                   7,110                  34,650
<EXPENSE-OTHER>                             82,648,997              19,313,673              20,093,016              20,873,443
<INCOME-PRETAX>                             20,339,901               4,902,283               5,045,625               5,205,831
<INCOME-PRE-EXTRAORDINARY>                  11,580,261               2,821,566               2,894,709               2,934,642
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                11,580,261               2,821,566               2,894,709               2,934,642
<EPS-PRIMARY>                                     1.80                     .44                     .45                     .46
<EPS-DILUTED>                                     1.75                     .43                     .44                     .44
<YIELD-ACTUAL>                                    2.24                    2.71                    2.60                    2.38
<LOANS-NON>                                          0                       0                       0                       0
<LOANS-PAST>                                         0                       0                       0                       0
<LOANS-TROUBLED>                                     0                       0                       0                       0
<LOANS-PROBLEM>                                      0                       0                       0                       0
<ALLOWANCE-OPEN>                               100,000                 100,000                 100,000                 100,000
<CHARGE-OFFS>                                        0                       0                       0                       0
<RECOVERIES>                                         0                       0                       0                       0
<ALLOWANCE-CLOSE>                              100,000                 100,000                 100,000                 100,000
<ALLOWANCE-DOMESTIC>                                 0                       0                       0                       0
<ALLOWANCE-FOREIGN>                                  0                       0                       0                       0
<ALLOWANCE-UNALLOCATED>                        100,000                 100,000                 100,000                 100,000
        

</TABLE>