<TABLE> <S> <C>

<PAGE>
<ARTICLE> 9
<RESTATED> 
<CIK> 0000803644
<NAME> FCNB CORP
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>                     <C>
<C>
<PERIOD-TYPE>                   YEAR                   YEAR                   3-MOS                   6-MOS
9-MOS
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1995             DEC-31-1996             DEC-31-1996
             DEC-31-1996
<PERIOD-START>                             JAN-01-1996             JAN-01-1995             JAN-01-1998             JAN-01-1996
             JAN-01-1996
<PERIOD-END>                               DEC-31-1996             DEC-31-1995             MAR-31-1996             JUN-30-1996
             SEP-30-1996
<CASH>                                          31,023                  24,085                  23,936                  24,052
                  23,822
<INT-BEARING-DEPOSITS>                           1,065                   2,261                   2,876                   1,229
                   1,615
<FED-FUNDS-SOLD>                                12,438                  20,017                  23,526                  16,315
                  12,454
<TRADING-ASSETS>                                     0                       0                       0                       0
                       0
<INVESTMENTS-HELD-FOR-SALE>                    162,860                  83,987                 108,235                 128,911
                 156,431
<INVESTMENTS-CARRYING>                          33,525                  58,511                  37,871                  38,422
                  34,552
<INVESTMENTS-MARKET>                            33,740                  59,192                  37,962                  38,839
                  34,395
<LOANS>                                        497,995                 439,794                 439,400                 469,278
                 480,021
<ALLOWANCE>                                      5,123                   5,242                   5,252                   5,450
                   5,432
<TOTAL-ASSETS>                                 779,169                 660,984                 670,771                 717,747
                 749,049
<DEPOSITS>                                     587,074                 529,988                 537,052                 568,821
                 569,621
<SHORT-TERM>                                   117,255                  53,469                  58,010                  72,578
                 100,606
<LIABILITIES-OTHER>                              5,730                   5,628                   4,923                   5,067
                   5,330
<LONG-TERM>                                          0                   5,680                   6,180                   6,180
                   6,180
<PREFERRED-MANDATORY>                                0                       0                       0                       0
                       0
<PREFERRED>                                          0                       0                       0                       0
                       0
<COMMON>                                         5,365                   5,298                   5,391                   5,381
                   5,376
<OTHER-SE>                                      63,745                  60,921                  59,215                  59,720
                  61,936
<TOTAL-LIABILITIES-AND-EQUITY>                 779,169                 660,984                 670,771                 717,747
                 749,049
<INTEREST-LOAN>                                 42,948                  39,341                  10,769                  21,173
                  31,994
<INTEREST-INVEST>                               10,772                  10,917                   2,373                   4,833
                   7,873
<INTEREST-OTHER>                                   933                     868                     357                     572
                     743
<INTEREST-TOTAL>                                54,653                  51,126                  13,499                  26,578
                  40,410
<INTEREST-DEPOSIT>                              20,549                  19,361                   5,225                  10,170
                  15,333
<INTEREST-EXPENSE>                              25,014                  22,759                   5,994                  11,864
                  18,272
<INTEREST-INCOME-NET>                           29,639                  28,387                   7,505                  14,714
                  22,138
<LOAN-LOSSES>                                      318                     710                      72                     144
                     216
<SECURITIES-GAINS>                                 193                     123                      65                     161
                     171
<EXPENSE-OTHER>                                 24,470                  20,889                   7,078                  12,535
                  18,925
<INCOME-PRETAX>                                  9,112                  10,886                   1,368                   4,223
                   6,173
<INCOME-PRE-EXTRAORDINARY>                       9,112                  10,886                   1,368                   4,223
                   6,173
<EXTRAORDINARY>                                      0                       0                       0                       0
                       0
<CHANGES>                                            0                       0                       0                       0
                       0
<NET-INCOME>                                     5,867                   6,998                   (809)                   1,044
                   3,965
<EPS-PRIMARY>                                     0.99                    1.19                  (0.14)                    0.17
                    0.67
<EPS-DILUTED>                                     0.99                    1.19                  (0.14)                    0.17
                    0.67
<YIELD-ACTUAL>                                    8.33                    8.62                    8.43                    8.38
                    8.36
<LOANS-NON>                                      4,831                   2,532                   4,294                   5,417
                   5,310
<LOANS-PAST>                                     2,531                     122                     334                   1,099
                   1,861
<LOANS-TROUBLED>                                     0                       0                       0                       0
                       0
<LOANS-PROBLEM>                                 16,880                  13,480                  21,652                  16,532
                  17,480
<ALLOWANCE-OPEN>                                 5,242                   4,691                   5,242                   5,242
                   5,242
<CHARGE-OFFS>                                      999                     209                     382                     451
                     573
<RECOVERIES>                                       100                      50                      22                      53
                      85
<ALLOWANCE-CLOSE>                                5,123                   5,242                   5,252                   5,450
                   5,432
<ALLOWANCE-DOMESTIC>                             5,123                   5,242                   5,252                   5,450
                   5,432
<ALLOWANCE-FOREIGN>                                  0                       0                       0                       0
                       0
<ALLOWANCE-UNALLOCATED>                              0                       0                       0                       0
                       0
        

</TABLE>