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Condensed Statements of Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]                      
Income tax expense $ (2,993) $ (3,084) $ (2,467) $ (2,837) $ (2,931) $ (3,609) $ (3,223) $ (2,561) $ (11,381) $ (12,324) $ (10,908)
Net income 6,148 6,259 6,175 5,958 5,715 7,043 7,007 5,725 24,540 25,490 23,312
Dividends on preferred stock       105 227 228 227 228 105 910 1,024
Net income available to common shareholders $ 6,148 $ 6,259 $ 6,175 $ 5,853 $ 5,488 $ 6,815 $ 6,780 $ 5,497 24,435 24,580 22,288
First Community Bancshares, Inc.                      
Condensed Financial Statements, Captions [Line Items]                      
Cash dividends received from subsidiary bank                 22,970 14,148 43,900
Other income                 1,039 515 726
Operating expense                 (2,080) (1,793) (1,647)
Income tax expense                 616 511 368
Equity in undistributed earnings of subsidiary                 1,995 12,109 (20,035)
Net income                 24,540 25,490 23,312
Dividends on preferred stock                 105 910 1,024
Net income available to common shareholders                 $ 24,435 $ 24,580 $ 22,288