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Company's and Bank's Capital Ratios (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
First Community Bancshares, Inc.    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 Leverage ratio $ 256,671 $ 249,436
Total risk-based capital ratio 274,953 269,998
Common equity Tier 1 ratio 256,671 249,436
Common equity Tier 1 ratio $ 104,483 $ 101,595
Common equity Tier 1 ratio 14.74% 14.73%
Total risk-based capital ratio $ 139,311 $ 135,459
Total risk-based capital ratio 15.79% 15.95%
Tier 1 Leverage ratio $ 92,742 $ 93,935
Tier 1 Leverage ratio 11.07% 10.62%
Common equity Tier 1 ratio 6.00% 6.00%
Total risk-based capital ratio 8.00% 8.00%
Tier 1 Leverage ratio 4.00% 4.00%
First Community Bancshares, Inc. | Basel III Fully Phased-In    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common equity Tier 1 ratio $ 148,018 $ 143,926
Total risk-based capital ratio 182,846 177,791
Tier 1 Leverage ratio $ 92,742 $ 93,935
Common equity Tier 1 ratio 8.50% 8.50%
Total risk-based capital ratio 10.50% 10.50%
Tier 1 Leverage ratio 4.00% 4.00%
Tier 1 Leverage ratio 5.29%  
First Community Bancshares, Inc. | Common Stock    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common equity Tier 1 ratio $ 241,671 $ 246,237
Common equity Tier 1 ratio $ 78,362 $ 76,196
Common equity Tier 1 ratio 13.88% 14.54%
Common equity Tier 1 ratio 4.50% 4.50%
First Community Bancshares, Inc. | Common Stock | Basel III Fully Phased-In    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common equity Tier 1 ratio $ 121,897 $ 118,527
Common equity Tier 1 ratio 7.00% 7.00%
First Community Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 Leverage ratio $ 223,944 $ 228,669
Total risk-based capital ratio 242,218 249,228
Common equity Tier 1 ratio 223,944 228,669
Common equity Tier 1 ratio $ 103,941 $ 100,910
Common equity Tier 1 ratio 12.93% 13.60%
Total risk-based capital ratio $ 138,588 $ 134,546
Total risk-based capital ratio 13.98% 14.82%
Tier 1 Leverage ratio $ 92,274 $ 93,616
Tier 1 Leverage ratio 9.71% 9.77%
Common equity Tier 1 ratio 6.00% 6.00%
Common equity Tier 1 ratio [1] $ 138,588 $ 134,546
Total risk-based capital ratio 8.00% 8.00%
Total risk-based capital ratio [1] $ 173,235 $ 168,183
Tier 1 Leverage ratio 4.00% 4.00%
Tier 1 Leverage ratio [1] $ 115,343 $ 117,020
Common equity Tier 1 ratio [1] 8.00% 8.00%
Total risk-based capital ratio [1] 10.00% 10.00%
Tier 1 Leverage ratio [1] 5.00% 5.00%
First Community Bank | Basel III Fully Phased-In    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common equity Tier 1 ratio $ 147,249 $ 142,955
Total risk-based capital ratio 181,897 176,592
Tier 1 Leverage ratio $ 92,274 $ 93,616
Common equity Tier 1 ratio 8.50% 8.50%
Total risk-based capital ratio 10.50% 10.50%
Tier 1 Leverage ratio 4.00% 4.00%
Tier 1 Leverage ratio 3.48%  
First Community Bank | Common Stock    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common equity Tier 1 ratio $ 223,944 $ 228,669
Common equity Tier 1 ratio $ 77,956 $ 75,682
Common equity Tier 1 ratio 12.93% 13.60%
Common equity Tier 1 ratio 4.50% 4.50%
Common equity Tier 1 ratio [1] $ 112,603 $ 109,319
Common equity Tier 1 ratio [1] 6.50% 6.50%
First Community Bank | Common Stock | Basel III Fully Phased-In    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common equity Tier 1 ratio $ 121,264 $ 117,728
Common equity Tier 1 ratio 7.00% 7.00%
[1] Based on prompt corrective action provisions