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Company's and Bank's Capital Ratios (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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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

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