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Loans Modified as Troubled Debt Restructurings by Type of Concession Made and Loan Class (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Contract	Dec. 31, 2013 Contract
Financing Receivable, Modifications [Line Items]
Total Contracts	13us-gaap_FinancingReceivableModificationsNumberOfContracts2	8us-gaap_FinancingReceivableModificationsNumberOfContracts2
Pre-Modification Recorded Investment	$ 3,608us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2	$ 2,296us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Post-Modification Recorded Investment	3,608us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	2,153us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Below Market Interest Rate
Financing Receivable, Modifications [Line Items]
Total Contracts	5us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateMember	2us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateMember
Pre-Modification Recorded Investment	2,095us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateMember	601us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateMember
Post-Modification Recorded Investment	2,095us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateMember	557us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateMember
Below Market Interest Rate | Owner occupied construction
Financing Receivable, Modifications [Line Items]
Total Contracts	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_PrincipalOwnerMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateMember
Pre-Modification Recorded Investment	245us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_PrincipalOwnerMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateMember
Post-Modification Recorded Investment	245us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_PrincipalOwnerMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateMember
Below Market Interest Rate | Single Family Owner Occupied
Financing Receivable, Modifications [Line Items]
Total Contracts	4us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateMember	2us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateMember
Pre-Modification Recorded Investment	1,850us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateMember	601us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateMember
Post-Modification Recorded Investment	1,850us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateMember	557us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateMember
Extended Payment Term
Financing Receivable, Modifications [Line Items]
Total Contracts	2us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ExtendedPaymentTermMember
Pre-Modification Recorded Investment	771us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ExtendedPaymentTermMember
Post-Modification Recorded Investment	771us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ExtendedPaymentTermMember
Extended Payment Term | Non-farm, Non-residential
Financing Receivable, Modifications [Line Items]
Total Contracts	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ExtendedPaymentTermMember
Pre-Modification Recorded Investment	303us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ExtendedPaymentTermMember
Post-Modification Recorded Investment	303us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ExtendedPaymentTermMember
Extended Payment Term | Single-family Non-owner Occupied
Financing Receivable, Modifications [Line Items]
Total Contracts	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ExtendedPaymentTermMember
Pre-Modification Recorded Investment	468us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ExtendedPaymentTermMember
Post-Modification Recorded Investment	468us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ExtendedPaymentTermMember
Below Market Interest Rate And Extended Payment Term
Financing Receivable, Modifications [Line Items]
Total Contracts	6us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateAndExtendedPaymentTermMember	6us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateAndExtendedPaymentTermMember
Pre-Modification Recorded Investment	742us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateAndExtendedPaymentTermMember	1,695us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateAndExtendedPaymentTermMember
Post-Modification Recorded Investment	742us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateAndExtendedPaymentTermMember	1,596us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateAndExtendedPaymentTermMember
Below Market Interest Rate And Extended Payment Term | Single Family Owner Occupied
Financing Receivable, Modifications [Line Items]
Total Contracts	5us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateAndExtendedPaymentTermMember	4us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateAndExtendedPaymentTermMember
Pre-Modification Recorded Investment	487us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateAndExtendedPaymentTermMember	809us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateAndExtendedPaymentTermMember
Post-Modification Recorded Investment	487us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateAndExtendedPaymentTermMember	757us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateAndExtendedPaymentTermMember
Below Market Interest Rate And Extended Payment Term | Non-farm, Non-residential
Financing Receivable, Modifications [Line Items]
Total Contracts		1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateAndExtendedPaymentTermMember
Pre-Modification Recorded Investment		511us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateAndExtendedPaymentTermMember
Post-Modification Recorded Investment		511us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateAndExtendedPaymentTermMember
Below Market Interest Rate And Extended Payment Term | Single-family Non-owner Occupied
Financing Receivable, Modifications [Line Items]
Total Contracts	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateAndExtendedPaymentTermMember	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateAndExtendedPaymentTermMember
Pre-Modification Recorded Investment	255us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateAndExtendedPaymentTermMember	375us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateAndExtendedPaymentTermMember
Post-Modification Recorded Investment	$ 255us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateAndExtendedPaymentTermMember	$ 328us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_BelowMarketInterestRateAndExtendedPaymentTermMember

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Number of 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 10

-Section 50

-Paragraph 33

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524

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