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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	$ 14,731us-gaap_FinancingReceivableModificationsRecordedInvestment		$ 15,088us-gaap_FinancingReceivableModificationsRecordedInvestment
Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Impaired [Line Items]
Total TDRs	829us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember		1,088us-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	4,787us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember		4,826us-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	46us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember		47us-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	8,822us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember		8,883us-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	247us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_OwnerOccupiedConstructionMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember		244us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_OwnerOccupiedConstructionMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember
Nonaccrual
Financing Receivable, Impaired [Line Items]
Total TDRs	706us-gaap_FinancingReceivableModificationsRecordedInvestment / fcbc_TypeOfLoanAxis = fcbc_NonAccrualLoansMember	[1]	554us-gaap_FinancingReceivableModificationsRecordedInvestment / fcbc_TypeOfLoanAxis = fcbc_NonAccrualLoansMember	[1]
Nonaccrual | Commercial Loans | Non-farm, Non-residential
Financing Receivable, Impaired [Line Items]
Total TDRs	83us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_TypeOfLoanAxis = fcbc_NonAccrualLoansMember	[1]	83us-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	623us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember / fcbc_TypeOfLoanAxis = fcbc_NonAccrualLoansMember	[1]	471us-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	14,025us-gaap_FinancingReceivableModificationsRecordedInvestment / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember		14,534us-gaap_FinancingReceivableModificationsRecordedInvestment / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember
Accrual | Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Impaired [Line Items]
Total TDRs	829us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember		1,088us-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	4,704us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember		4,743us-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	46us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember		47us-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	8,199us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember		8,412us-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	$ 247us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = fcbc_OwnerOccupiedConstructionMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember		$ 244us-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

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