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Loans Modified as Troubled Debt Restructurings by Loan Class Segregated by Accrual Status (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |  |  |
Total TDRs | $ 14,731 us-gaap_FinancingReceivableModificationsRecordedInvestment |  | $ 15,088 us-gaap_FinancingReceivableModificationsRecordedInvestment |
Commercial Loans | Single-family Non-owner Occupied |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Total TDRs | 829 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember |  | 1,088 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember |
Commercial Loans | Non-farm, Non-residential |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Total TDRs | 4,787 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember |  | 4,826 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember |
Consumer Real Estate | Home Equity Lines |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Total TDRs | 46 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember |  | 47 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember |
Consumer Real Estate | Single Family Owner Occupied |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Total TDRs | 8,822 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember |  | 8,883 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember |
Consumer Real Estate | Owner Occupied Construction |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Total TDRs | 247 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_OwnerOccupiedConstructionMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember |  | 244 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_OwnerOccupiedConstructionMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember |
Nonaccrual |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Total TDRs | 706 us-gaap_FinancingReceivableModificationsRecordedInvestment / fcbc_TypeOfLoanAxis = fcbc_NonAccrualLoansMember | [1] | 554 us-gaap_FinancingReceivableModificationsRecordedInvestment / fcbc_TypeOfLoanAxis = fcbc_NonAccrualLoansMember | [1]
Nonaccrual | Commercial Loans | Non-farm, Non-residential |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Total TDRs | 83 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_TypeOfLoanAxis = fcbc_NonAccrualLoansMember | [1] | 83 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_TypeOfLoanAxis = fcbc_NonAccrualLoansMember | [1]
Nonaccrual | Consumer Real Estate | Single Family Owner Occupied |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Total TDRs | 623 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember / fcbc_TypeOfLoanAxis = fcbc_NonAccrualLoansMember | [1] | 471 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember / fcbc_TypeOfLoanAxis = fcbc_NonAccrualLoansMember | [1]
Accrual |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Total TDRs | 14,025 us-gaap_FinancingReceivableModificationsRecordedInvestment / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember |  | 14,534 us-gaap_FinancingReceivableModificationsRecordedInvestment / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember |
Accrual | Commercial Loans | Single-family Non-owner Occupied |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Total TDRs | 829 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember |  | 1,088 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember |
Accrual | Commercial Loans | Non-farm, Non-residential |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Total TDRs | 4,704 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember |  | 4,743 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember |
Accrual | Consumer Real Estate | Home Equity Lines |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Total TDRs | 46 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember |  | 47 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember |
Accrual | Consumer Real Estate | Single Family Owner Occupied |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Total TDRs | 8,199 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember |  | 8,412 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember |
Accrual | Consumer Real Estate | Owner Occupied Construction |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Total TDRs | $ 247 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_OwnerOccupiedConstructionMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember |  | $ 244 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_OwnerOccupiedConstructionMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember |
[1] | TDRs on nonaccrual status are included in the total nonaccrual loan balance disclosed in the table above.

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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