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Condensed Statements of Income (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]                      
Other income                 $ 2,459 $ 236 $ 261
Income tax expense (3,957) (5,322) (1,997) (2,852) (2,151) (2,502) (2,572) (2,348) (14,128) (9,573) (7,818)
Net income 8,439 10,059 4,078 6,001 3,231 5,318 5,728 5,751 28,577 20,028 21,847
Dividends on preferred stock (272) (220) (283) (283) (286) (286) (131)   (1,058) (703)  
Net income available to common shareholders 8,167 9,839 3,795 5,718 2,945 5,032 5,597 5,751 27,519 19,325 21,847
First Community Bancshares, Inc.
                      
Condensed Financial Statements, Captions [Line Items]                      
Cash dividends received from subsidiary bank                 8,105    
Other income                 445 2,227 2,134
Operating expense                 (1,318) (1,796) (1,556)
Income tax expense                 (55) (150) (223)
Equity in undistributed earnings of subsidiary                 21,400 19,747 21,492
Net income                 28,577 20,028 21,847
Dividends on preferred stock                 1,058 703  
Net income available to common shareholders                 $ 27,519 $ 19,325 $ 21,847