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Components of Covered Loan Portfolio, Disaggregated by Class (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held for investment, net of unearned income	$ 112,724us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered	$ 122,240us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
Commercial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held for investment, net of unearned income	43,716us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	49,340us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial Loans | Construction Development And Other Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held for investment, net of unearned income	10,410us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_ConstructionDevelopmentAndOtherLandMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	13,100us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_ConstructionDevelopmentAndOtherLandMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial Loans | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held for investment, net of unearned income	2,371us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_CommercialAndIndustrialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	2,662us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_CommercialAndIndustrialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial Loans | Multi-family Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held for investment, net of unearned income	678us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_MultiFamilyResidentialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	1,584us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_MultiFamilyResidentialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial Loans | Single-family Non-owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held for investment, net of unearned income	4,846us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	5,918us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial Loans | Non-farm Non-residential Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held for investment, net of unearned income	24,672us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_NonFarmNonResidentialLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	25,317us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_NonFarmNonResidentialLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial Loans | Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held for investment, net of unearned income	42us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_AgriculturalMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	43us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_AgriculturalMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial Loans | Farmland Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held for investment, net of unearned income	697us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_FarmlandMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	716us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_FarmlandMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Consumer Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held for investment, net of unearned income	68,921us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember	72,812us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember
Consumer Real Estate | Home Equity Lines
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held for investment, net of unearned income	57,415us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember	60,391us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember
Consumer Real Estate | Single Family Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held for investment, net of unearned income	10,994us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember	11,968us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember
Consumer Real Estate | Owner Occupied Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held for investment, net of unearned income	512us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_OwnerOccupiedConstructionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember	453us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_OwnerOccupiedConstructionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember
Consumer and Other Loans | Consumer Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans held for investment, net of unearned income	$ 87us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerAndOtherLoansMember	$ 88us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerAndOtherLoansMember

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- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

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Aggregate gross carrying amount of loans and leases receivable covered by loss sharing agreements.

+ References

No definition available.

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