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Regulatory Requirements and Restrictions - Additional Information (Detail) | Jan. 01, 2016 | Dec. 31, 2016 | Dec. 31, 2015
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Capital conservation buffer, phased period |  | 4 years |  |
First Community Bank |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Capital conservation buffer, risk-weighted assets ratio | [1] |  | 5.00% | 5.00%
On January 1, 2016 |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Capital conservation buffer, risk-weighted assets ratio |  | 0.625% |  |
On January 1, 2019 |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Capital conservation buffer, risk-weighted assets ratio |  | 2.50% |  |
Basel III Fully Phased-In | First Community Bancshares, Inc. |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Capital conservation buffer, risk-weighted assets ratio |  |  | 5.29% |
Basel III Fully Phased-In | First Community Bank |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Capital conservation buffer, risk-weighted assets ratio |  |  | 3.48% |
[1] | Based on prompt corrective action provisions

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- Definition The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in 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 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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