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Company's and Bank's Capital Ratios (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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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 |

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- Definition The minimum amount of tangible capital required under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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