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Condensed Statements of Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]                      
Other operating expense                 $ (19,947) $ (21,111) $ (22,242)
Income before income taxes and equity in undistributed net (loss) income of subsidiaries $ 10,042 $ 9,613 $ 9,277 $ 9,013 $ 9,141 $ 9,343 $ 8,642 $ 8,795      
Income tax benefit (3,638) (3,230) (3,022) (2,929) (2,993) (3,084) (2,467) (2,837) (12,819) (11,381) (12,324)
Net income         6,148 6,259 6,175 5,958 25,126 24,540 25,490
Dividends on preferred stock               105   105 910
Net income available to common shareholders $ 6,404 $ 6,383 $ 6,255 $ 6,084 $ 6,148 $ 6,259 $ 6,175 $ 5,853 25,126 24,435 24,580
First Community Bancshares, Inc.                      
Condensed Financial Statements, Captions [Line Items]                      
Cash dividends received from subsidiary bank                 32,000 22,970 14,148
Other income                 (1,121) 1,039 515
Other operating expense                 2,097 2,080 1,793
Income before income taxes and equity in undistributed net (loss) income of subsidiaries                 28,782 21,929 12,870
Income tax benefit                 (1,287) (616) (511)
Income before equity in undistributed net income of subsidiaries                 30,069 22,545 13,381
(Dividends in excess of) equity in undistributed net income of subsidiaries                 (4,943) 1,995 12,109
Net income                 25,126 24,540 25,490
Dividends on preferred stock                   105 910
Net income available to common shareholders                 $ 25,126 $ 24,435 $ 24,580