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Company's and Bank's Capital Ratios (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
First Community Bancshares, Inc.    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk-Weighted Assets, actual amount $ 269,998 $ 284,999
Total Capital to Risk-Weighted Assets, actual (ratio) 15.95% 17.68%
Total Capital to Risk-Weighted Assets, for capital adequacy purposes amount   $ 128,962
Total Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio)   8.00%
Tier 1 Capital to Risk-Weighted Assets, actual amount $ 249,436 $ 264,838
Tier 1 Capital to Average Assets (Leverage), actual amount $ 249,436 $ 264,838
Tier 1 Capital to Risk-Weighted Assets, actual (ratio) 14.73% 16.43%
Tier 1 Capital to Average Assets (Leverage), actual (ratio) 10.62% 10.12%
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes amount   $ 64,481
Tier 1 Capital to Average Assets (Leverage), for capital adequacy purposes amount   $ 104,679
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio)   4.00%
Tier 1 Capital to Average Assets (Leverage), for capital adequacy purposes (ratio)   4.00%
First Community Bancshares, Inc. | Basel III Fully Phase-In    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio) 10.50%  
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio) 8.50%  
Tier 1 Capital to Average Assets (Leverage), for capital adequacy purposes (ratio) 4.00%  
First Community Bancshares, Inc. | Fully Phased In    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk-Weighted Assets, for capital adequacy purposes amount $ 177,791  
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes amount 143,926  
Tier 1 Capital to Average Assets (Leverage), for capital adequacy purposes amount $ 93,935  
First Community Bancshares, Inc. | Phase In Schedule    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio) 8.00%  
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio) 6.00%  
Tier 1 Capital to Average Assets (Leverage), for capital adequacy purposes (ratio) 4.00%  
First Community Bancshares, Inc. | Basel III Phase-In    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk-Weighted Assets, for capital adequacy purposes amount $ 135,459  
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes amount 101,595  
Tier 1 Capital to Average Assets (Leverage), for capital adequacy purposes amount 93,935  
First Community Bancshares, Inc. | Common Stock    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 Capital to Risk-Weighted Assets, actual amount $ 246,237  
Tier 1 Capital to Risk-Weighted Assets, actual (ratio) 14.54%  
First Community Bancshares, Inc. | Common Stock | Basel III Fully Phase-In    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio) 7.00%  
First Community Bancshares, Inc. | Common Stock | Fully Phased In    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes amount $ 118,527  
First Community Bancshares, Inc. | Common Stock | Phase In Schedule    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio) 4.50%  
First Community Bancshares, Inc. | Common Stock | Basel III Phase-In    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes amount $ 76,196  
First Community Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk-Weighted Assets, actual amount $ 249,228 $ 251,256
Total Capital to Risk-Weighted Assets, actual (ratio) 14.82% 15.73%
Total Capital to Risk-Weighted Assets, for capital adequacy purposes amount   $ 127,761
Total Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio)   8.00%
Total Capital to Risk-Weighted Assets, to be well capitalized under prompt corrective action provision amount $ 168,183 $ 159,701
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, actual amount $ 228,669 $ 231,286
Tier 1 Capital to Average Assets (Leverage), actual amount $ 228,669 $ 231,286
Tier 1 Capital to Risk-Weighted Assets, actual (ratio) 13.60% 14.48%
Tier 1 Capital to Average Assets (Leverage), actual (ratio) 9.77% 8.87%
Tier 1 Capital to Risk-Weighted Assets, to be well capitalized under prompt corrective action provision amount $ 134,546 $ 95,821
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes amount   63,881
Tier 1 Capital to Average Assets (Leverage), to be well capitalized under prompt corrective action provision amount $ 117,020 130,412
Tier 1 Capital to Average Assets (Leverage), for capital adequacy purposes amount   $ 104,330
Tier 1 Capital to Risk-Weighted Assets, to be well capitalized under prompt corrective action provision (ratio) 8.00% 6.00%
Tier 1 Capital to Average Assets (Leverage), to be well capitalized under prompt corrective action provision (ratio) 5.00% 5.00%
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio)   4.00%
Tier 1 Capital to Average Assets (Leverage), for capital adequacy purposes (ratio)   4.00%
First Community Bank | Basel III Fully Phase-In    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio) 10.50%  
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio) 8.50%  
Tier 1 Capital to Average Assets (Leverage), for capital adequacy purposes (ratio) 4.00%  
First Community Bank | Fully Phased In    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk-Weighted Assets, for capital adequacy purposes amount $ 176,592  
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes amount 142,955  
Tier 1 Capital to Average Assets (Leverage), for capital adequacy purposes amount $ 93,616  
First Community Bank | Phase In Schedule    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio) 8.00%  
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio) 6.00%  
Tier 1 Capital to Average Assets (Leverage), for capital adequacy purposes (ratio) 4.00%  
First Community Bank | Basel III Phase-In    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk-Weighted Assets, for capital adequacy purposes amount $ 134,546  
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes amount 100,910  
Tier 1 Capital to Average Assets (Leverage), for capital adequacy purposes amount 93,616  
First Community Bank | Common Stock    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 Capital to Risk-Weighted Assets, actual amount $ 228,669  
Tier 1 Capital to Risk-Weighted Assets, actual (ratio) 13.60%  
Tier 1 Capital to Risk-Weighted Assets, to be well capitalized under prompt corrective action provision amount $ 109,319  
Tier 1 Capital to Risk-Weighted Assets, to be well capitalized under prompt corrective action provision (ratio) 6.50%  
First Community Bank | Common Stock | Basel III Fully Phase-In    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio) 7.00%  
First Community Bank | Common Stock | Fully Phased In    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes amount $ 117,728  
First Community Bank | Common Stock | Phase In Schedule    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio) 4.50%  
First Community Bank | Common Stock | Basel III Phase-In    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes amount $ 75,682