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Allowance For Loan Losses for PCI Loans, by Loan Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 20,227us-gaap_LoansAndLeasesReceivableAllowance	$ 24,077us-gaap_LoansAndLeasesReceivableAllowance
Benefit attributable to FDIC indemnification asset	(46)fcbc_ProvisionBenefitForLoanLosses	203fcbc_ProvisionBenefitForLoanLosses
Provision for (recovery of) loan losses charged to operations	1,100fcbc_ProvisionForRecoveryOfLoanAndLeaseLosses	1,793fcbc_ProvisionForRecoveryOfLoanAndLeaseLosses
Ending balance	20,252us-gaap_LoansAndLeasesReceivableAllowance	23,798us-gaap_LoansAndLeasesReceivableAllowance
Purchased Credit Impaired
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	58us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember	755us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember
Purchased impaired (recovery) provision	56us-gaap_AllowanceForLoanAndLeaseLossesLoansAcquired / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember	(262)us-gaap_AllowanceForLoanAndLeaseLossesLoansAcquired / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember
Benefit attributable to FDIC indemnification asset	(46)fcbc_ProvisionBenefitForLoanLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember	203fcbc_ProvisionBenefitForLoanLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember
Provision for (recovery of) loan losses charged to operations	10fcbc_ProvisionForRecoveryOfLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember	(59)fcbc_ProvisionForRecoveryOfLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset	46us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember	(203)us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember
Ending balance	114us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember	493us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember
Commercial Loans | Purchased Credit Impaired
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	37us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	77us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Purchased impaired (recovery) provision	(37)us-gaap_AllowanceForLoanAndLeaseLossesLoansAcquired / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	(69)us-gaap_AllowanceForLoanAndLeaseLossesLoansAcquired / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Benefit attributable to FDIC indemnification asset	29fcbc_ProvisionBenefitForLoanLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	55fcbc_ProvisionBenefitForLoanLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Provision for (recovery of) loan losses charged to operations	(8)fcbc_ProvisionForRecoveryOfLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	(14)fcbc_ProvisionForRecoveryOfLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset	(29)us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	(55)us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Ending balance		8us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Consumer Real Estate | Purchased Credit Impaired
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	21us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember	678us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember
Purchased impaired (recovery) provision	93us-gaap_AllowanceForLoanAndLeaseLossesLoansAcquired / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember	(193)us-gaap_AllowanceForLoanAndLeaseLossesLoansAcquired / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember
Benefit attributable to FDIC indemnification asset	(75)fcbc_ProvisionBenefitForLoanLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember	148fcbc_ProvisionBenefitForLoanLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember
Provision for (recovery of) loan losses charged to operations	18fcbc_ProvisionForRecoveryOfLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember	(45)fcbc_ProvisionForRecoveryOfLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset	75us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember	(148)us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember
Ending balance	$ 114us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember	$ 485us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember

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- Definition

(Provision) Benefit for Loan Losses

+ References

No definition available.

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Provision for (Recovery of) Loan and Lease Losses

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No definition available.

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- Definition

Amount of addition to allowance reserve for credit loss arising from purchase of loan and lease portfolios.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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-Section 50

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-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524



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-Name Accounting Standards Codification

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 11

-Article 9



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

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-Paragraph 1

-Subparagraph (SX 210.9-04.11)

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