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Company's and Bank's Capital Ratios (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
First Community Bancshares, Inc.
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital to Risk-Weighted Assets, actual amount	$ 284,999us-gaap_Capital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 270,636us-gaap_Capital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Tier 1 Capital to Risk-Weighted Assets, actual amount	264,838us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	250,012us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Tier 1 Capital to Average Assets (Leverage), actual amount	264,838us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	250,012us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total Capital to Risk-Weighted Assets, actual (ratio)	17.68%us-gaap_TangibleCapitalToTangibleAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	16.44%us-gaap_TangibleCapitalToTangibleAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Tier 1 Capital to Risk-Weighted Assets, actual (ratio)	16.43%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	15.19%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Tier 1 Capital to Average Assets (Leverage), actual (ratio)	10.12%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	9.95%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total Capital to Risk-Weighted Assets, for capital adequacy purposes amount	128,962us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	131,694us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes amount	64,481us-gaap_TangibleCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	65,847us-gaap_TangibleCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Tier 1 Capital to Average Assets (Leverage), for capital adequacy purposes amount	104,679us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	100,489us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio)	8.00%us-gaap_TangibleCapitalRequiredForCapitalAdequacyToTangibleAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	8.00%us-gaap_TangibleCapitalRequiredForCapitalAdequacyToTangibleAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio)	4.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	4.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Tier 1 Capital to Average Assets (Leverage), for capital adequacy purposes (ratio)	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
First Community Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital to Risk-Weighted Assets, actual amount	251,256us-gaap_Capital / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember	236,699us-gaap_Capital / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember
Tier 1 Capital to Risk-Weighted Assets, actual amount	231,286us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember	216,314us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember
Tier 1 Capital to Average Assets (Leverage), actual amount	231,286us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember	216,314us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember
Total Capital to Risk-Weighted Assets, actual (ratio)	15.73%us-gaap_TangibleCapitalToTangibleAssets / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember	14.55%us-gaap_TangibleCapitalToTangibleAssets / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember
Tier 1 Capital to Risk-Weighted Assets, actual (ratio)	14.48%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember	13.30%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember
Tier 1 Capital to Average Assets (Leverage), actual (ratio)	8.87%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember	8.63%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember
Total Capital to Risk-Weighted Assets, for capital adequacy purposes amount	127,761us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember	130,141us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes amount	63,881us-gaap_TangibleCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember	65,070us-gaap_TangibleCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember
Tier 1 Capital to Average Assets (Leverage), for capital adequacy purposes amount	104,330us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember	100,219us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember
Total Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio)	8.00%us-gaap_TangibleCapitalRequiredForCapitalAdequacyToTangibleAssets / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember	8.00%us-gaap_TangibleCapitalRequiredForCapitalAdequacyToTangibleAssets / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember
Tier 1 Capital to Risk-Weighted Assets, for capital adequacy purposes (ratio)	4.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember	4.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember
Tier 1 Capital to Average Assets (Leverage), for capital adequacy purposes (ratio)	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember
Total Capital to Risk-Weighted Assets, to be well capitalized under prompt corrective action provision amount	159,701us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember	162,676us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember
Tier 1 Capital to Risk-Weighted Assets, to be well capitalized under prompt corrective action provision amount	95,821us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember	97,606us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember
Tier 1 Capital to Average Assets (Leverage), to be well capitalized under prompt corrective action provision amount	$ 130,412us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember	$ 125,274us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember
Total Capital to Risk-Weighted Assets, to be well capitalized under prompt corrective action provision (ratio)	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember
Tier 1 Capital to Risk-Weighted Assets, to be well capitalized under prompt corrective action provision (ratio)	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember
Tier 1 Capital to Average Assets (Leverage), to be well capitalized under prompt corrective action provision (ratio)	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember

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The amount of total capital as defined in the regulations.

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The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action.

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The minimum amount of tangible capital required under the regulatory framework for prompt corrective action.

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The minimum amount of Tangible Capital divided by tangible assets (Tangible Capital Ratio) as defined in the regulations.

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Tangible Capital divided by Tangible assets as defined in the regulations.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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Tier 1 Risk Based Capital as defined in the regulations.

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