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Loans Modified as Troubled Debt Restructurings by Loan Class Segregated by Accrual Status (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Total TDRs	$ 15,088us-gaap_FinancingReceivableModificationsRecordedInvestment		$ 14,411us-gaap_FinancingReceivableModificationsRecordedInvestment
Commercial Loans | Commercial and Industrial
Financing Receivable, Impaired [Line Items]
Total TDRs			1,115us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_CommercialAndIndustrialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Impaired [Line Items]
Total TDRs	1,088us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember		375us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial Loans | Non-farm, Non-residential
Financing Receivable, Impaired [Line Items]
Total TDRs	4,826us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember		5,618us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember
Consumer Real Estate | Owner Occupied Construction
Financing Receivable, Impaired [Line Items]
Total TDRs	244us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_OwnerOccupiedConstructionMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember
Consumer Real Estate | Home Equity Lines
Financing Receivable, Impaired [Line Items]
Total TDRs	47us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember		210us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember
Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Impaired [Line Items]
Total TDRs	8,883us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember		7,093us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember
Nonaccrual
Financing Receivable, Impaired [Line Items]
Total TDRs	554us-gaap_FinancingReceivableModificationsRecordedInvestment / fcbc_TypeOfLoanAxis = fcbc_NonAccrualLoansMember	[1]	2,200us-gaap_FinancingReceivableModificationsRecordedInvestment / fcbc_TypeOfLoanAxis = fcbc_NonAccrualLoansMember	[1]
Nonaccrual | Commercial Loans | Commercial and Industrial
Financing Receivable, Impaired [Line Items]
Total TDRs			1,115us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_CommercialAndIndustrialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_TypeOfLoanAxis = fcbc_NonAccrualLoansMember	[1]
Nonaccrual | Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Impaired [Line Items]
Total TDRs			375us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_TypeOfLoanAxis = fcbc_NonAccrualLoansMember	[1]
Nonaccrual | Commercial Loans | Non-farm, Non-residential
Financing Receivable, Impaired [Line Items]
Total TDRs	83us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_TypeOfLoanAxis = fcbc_NonAccrualLoansMember	[1]	128us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_TypeOfLoanAxis = fcbc_NonAccrualLoansMember	[1]
Nonaccrual | Consumer Real Estate | Home Equity Lines
Financing Receivable, Impaired [Line Items]
Total TDRs			159us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember / fcbc_TypeOfLoanAxis = fcbc_NonAccrualLoansMember	[1]
Nonaccrual | Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Impaired [Line Items]
Total TDRs	471us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember / fcbc_TypeOfLoanAxis = fcbc_NonAccrualLoansMember	[1]	423us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember / fcbc_TypeOfLoanAxis = fcbc_NonAccrualLoansMember	[1]
Accrual
Financing Receivable, Impaired [Line Items]
Total TDRs	14,534us-gaap_FinancingReceivableModificationsRecordedInvestment / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember		12,211us-gaap_FinancingReceivableModificationsRecordedInvestment / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember
Accrual | Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Impaired [Line Items]
Total TDRs	1,088us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = 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	4,743us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember		5,490us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember
Accrual | Consumer Real Estate | Owner Occupied Construction
Financing Receivable, Impaired [Line Items]
Total TDRs	244us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_OwnerOccupiedConstructionMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember
Accrual | Consumer Real Estate | Home Equity Lines
Financing Receivable, Impaired [Line Items]
Total TDRs	47us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember		51us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = 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	$ 8,412us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember / fcbc_TypeOfLoanAxis = fcbc_AccrualLoansMember		$ 6,670us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / 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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