<TABLE> <S> <C>

<PAGE>
<ARTICLE> 9
<RESTATED> 
<CIK> 0000803644
<NAME> FCNB CORP
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-START>                             JAN-01-1997             JAN-01-1997             JAN-01-1997
<PERIOD-END>                               MAR-31-1997             JUN-30-1997             SEP-30-1997
<CASH>                                          24,057                  30,506                  24,583
<INT-BEARING-DEPOSITS>                           3,632                     826                   9,803
<FED-FUNDS-SOLD>                                14,885                  16,918                  15,493
<TRADING-ASSETS>                                     0                       0                       0
<INVESTMENTS-HELD-FOR-SALE>                    167,097                 182,051                 174,750
<INVESTMENTS-CARRYING>                          32,243                  39,947                  53,775
<INVESTMENTS-MARKET>                            32,277                  40,115                  54,119
<LOANS>                                        513,140                 533,433                 561,397
<ALLOWANCE>                                      5,513                   5,649                   5,360
<TOTAL-ASSETS>                                 807,332                 849,615                 894,260
<DEPOSITS>                                     595,899                 608,191                 603,424
<SHORT-TERM>                                   135,627                 164,230                 209,282
<LIABILITIES-OTHER>                              6,847                   5,122                   6,217
<LONG-TERM>                                          0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                         5,359                   5,359                   5,375
<OTHER-SE>                                      63,600                  66,713                  69,962
<TOTAL-LIABILITIES-AND-EQUITY>                 807,332                 849,615                 894,260
<INTEREST-LOAN>                                 11,350                  23,181                  35,658
<INTEREST-INVEST>                                3,199                   6,680                  10,407
<INTEREST-OTHER>                                   185                     320                     398
<INTEREST-TOTAL>                                14,734                  30,181                  46,463
<INTEREST-DEPOSIT>                               5,267                  10,748                  16,334
<INTEREST-EXPENSE>                               6,956                  14,342                  22,492
<INTEREST-INCOME-NET>                            7,778                  15,639                  23,971
<LOAN-LOSSES>                                      231                     462                     914
<SECURITIES-GAINS>                                  87                     144                     358
<EXPENSE-OTHER>                                  6,218                  12,062                  17,898
<INCOME-PRETAX>                                  2,622                   6,040                   9,567
<INCOME-PRE-EXTRAORDINARY>                       2,622                   6,040                   9,567
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                     1,850                   4,057                   6,424
<EPS-PRIMARY>                                     0.31                    0.69                    1.09
<EPS-DILUTED>                                     0.31                    0.69                    1.09
<YIELD-ACTUAL>                                    8.16                    8.26                    8.28
<LOANS-NON>                                      3,080                   3,110                   2,590
<LOANS-PAST>                                     2,800                   2,980                   1,040
<LOANS-TROUBLED>                                     0                       0                       0
<LOANS-PROBLEM>                                 14,780                  14,680                  16,610
<ALLOWANCE-OPEN>                                 5,123                   5,123                   5,123
<CHARGE-OFFS>                                      113                     329                   1,097
<RECOVERIES>                                       272                     393                     420
<ALLOWANCE-CLOSE>                                5,513                   5,649                   5,360
<ALLOWANCE-DOMESTIC>                             5,513                   5,649                   5,360
<ALLOWANCE-FOREIGN>                                  0                       0                       0
<ALLOWANCE-UNALLOCATED>                              0                       0                       0
        

</TABLE>