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Troubled Debt Restructurings by Loan Class for which there was Payment Default (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Contract
Financing Receivable, Modifications [Line Items]
Total Contracts	2us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Recorded Investment	$ 734us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Commercial Loans | Single-family Non-owner Occupied
Financing Receivable, Modifications [Line Items]
Total Contracts	1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember
Recorded Investment	375us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialPortfolioSegmentMember
Consumer Real Estate | Single Family Owner Occupied
Financing Receivable, Modifications [Line Items]
Total Contracts	1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember
Recorded Investment	$ 359us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fcbc_ConsumerRealEstateMember

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524

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- Definition

Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524

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