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Company's and Bank's Capital Ratios (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
First Community Bancshares, Inc.
   
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk-Weighted Assets, actual amount $ 282,729 $ 257,836
Tier 1 Capital to Risk-Weighted Assets, actual amount 261,467 239,928
Tier 1 Capital to Average Assets (Leverage), actual amount 261,467 239,928
Total Capital to Risk-Weighted Assets, actual (ratio) 16.70% 18.15%
Tier 1 Capital to Risk-Weighted Assets, actual (ratio) 15.44% 16.89%
Tier 1 Capital to Average Assets (Leverage), actual (ratio) 9.96% 11.50%
Total Capital to Risk-Weighted Assets, for capital adequacy purposes amount 135,441 113,626
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes amount 67,720 56,813
Tier 1 Capital to Average Assets (Leverage), for capital adequacy purposes amount 104,974 83,474
Total Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio) 8.00% 8.00%
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio) 4.00% 4.00%
Tier 1 Capital to Average Assets (Leverage), for capital adequacy purposes (ratio) 4.00% 4.00%
First Community Bank
   
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk-Weighted Assets, actual amount 255,219 226,508
Tier 1 Capital to Risk-Weighted Assets, actual amount 234,226 208,833
Tier 1 Capital to Average Assets (Leverage), actual amount 234,226 208,833
Total Capital to Risk-Weighted Assets, actual (ratio) 15.23% 16.12%
Tier 1 Capital to Risk-Weighted Assets, actual (ratio) 13.97% 14.86%
Tier 1 Capital to Average Assets (Leverage), actual (ratio) 8.98% 10.08%
Total Capital to Risk-Weighted Assets, for capital adequacy purposes amount 134,087 112,411
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes amount 67,043 56,206
Tier 1 Capital to Average Assets (Leverage), for capital adequacy purposes amount 104,304 82,909
Total Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio) 8.00% 8.00%
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio) 4.00% 4.00%
Tier 1 Capital to Average Assets (Leverage), for capital adequacy purposes (ratio) 4.00% 4.00%
Total Capital to Risk-Weighted Assets, to be well capitalized under prompt corrective action provision amount 167,609 140,514
Tier 1 Capital to Risk-Weighted Assets, to be well capitalized under prompt corrective action provision amount 100,565 84,308
Tier 1 Capital to Average Assets (Leverage), to be well capitalized under prompt corrective action provision amount $ 130,381 $ 103,637
Total Capital to Risk-Weighted Assets, to be well capitalized under prompt corrective action provision (ratio) 10.00% 10.00%
Tier 1 Capital to Risk-Weighted Assets, to be well capitalized under prompt corrective action provision (ratio) 6.00% 6.00%
Tier 1 Capital to Average Assets (Leverage), to be well capitalized under prompt corrective action provision (ratio) 5.00% 5.00%