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Components of Covered Loan Portfolio, Disaggregated by Class (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans held for investment, net of unearned income | $ 122,240 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered | $ 151,682 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
Commercial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans held for investment, net of unearned income | 49,340 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 64,255 us-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 | 13,100 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_ConstructionDevelopmentAndOtherLandMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 15,865 us-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 | 2,662 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_CommercialAndIndustrialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 3,325 us-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 | 1,584 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_MultiFamilyResidentialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 1,933 us-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 | 5,918 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 7,449 us-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 | 25,317 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_NonFarmNonResidentialLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 34,646 us-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 | 43 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_AgriculturalMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 164 us-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 | 716 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_FarmlandMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 873 us-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 | 72,812 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember | 87,309 us-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 | 60,391 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember | 69,206 us-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 | 11,968 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember | 16,919 us-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 | 453 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = us-gaap_PrincipalOwnerMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember | 1,184 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = us-gaap_PrincipalOwnerMember / 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 | $ 88 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerAndOtherLoansMember | $ 118 us-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 + Details
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- Definition Aggregate gross carrying amount of loans and leases receivable covered by loss sharing agreements. + References No definition available. + Details
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