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Allowance for Loan Losses Related to PCI Loans and Recorded Investment in Loans (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | $ 59,935 fcbc_AcquiredImpairedLoansEvaluatedForImpairment | $ 62,283 fcbc_AcquiredImpairedLoansEvaluatedForImpairment
Allowance for Acquired Impaired Loans Evaluated | 114 fcbc_AllowanceForAcquiredImpairedLoansEvaluated | 58 fcbc_AllowanceForAcquiredImpairedLoansEvaluated
Commercial Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 20,724 fcbc_AcquiredImpairedLoansEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 21,086 fcbc_AcquiredImpairedLoansEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Allowance for Acquired Impaired Loans Evaluated |  | 37 fcbc_AllowanceForAcquiredImpairedLoansEvaluated / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial Loans | Waccamaw Commercial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 13,210 fcbc_AcquiredImpairedLoansEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fcbc_WaccamawCommercialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 13,392 fcbc_AcquiredImpairedLoansEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fcbc_WaccamawCommercialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Allowance for Acquired Impaired Loans Evaluated |  | 37 fcbc_AllowanceForAcquiredImpairedLoansEvaluated / us-gaap_FinancialInstrumentAxis = fcbc_WaccamawCommercialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial Loans | Waccamaw Lines Of Credit |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 429 fcbc_AcquiredImpairedLoansEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fcbc_WaccamawLinesOfCreditMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 461 fcbc_AcquiredImpairedLoansEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fcbc_WaccamawLinesOfCreditMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial Loans | Peoples Commercial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 5,753 fcbc_AcquiredImpairedLoansEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fcbc_PeoplesCommercialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 5,875 fcbc_AcquiredImpairedLoansEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fcbc_PeoplesCommercialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial Loans | Commercial Loan Other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 1,332 fcbc_AcquiredImpairedLoansEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fcbc_CommercialLoanOtherMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 1,358 fcbc_AcquiredImpairedLoansEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fcbc_CommercialLoanOtherMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Consumer Real Estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 39,211 fcbc_AcquiredImpairedLoansEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember | 41,195 fcbc_AcquiredImpairedLoansEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember
Allowance for Acquired Impaired Loans Evaluated | 114 fcbc_AllowanceForAcquiredImpairedLoansEvaluated / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember | 21 fcbc_AllowanceForAcquiredImpairedLoansEvaluated / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember
Consumer Real Estate | Waccamaw Serviced Home Equity Lines |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 35,571 fcbc_AcquiredImpairedLoansEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fcbc_WaccamawServicedHomeEquityLinesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember | 37,342 fcbc_AcquiredImpairedLoansEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fcbc_WaccamawServicedHomeEquityLinesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember
Consumer Real Estate | Waccamaw Residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 2,439 fcbc_AcquiredImpairedLoansEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fcbc_WaccamawResidentialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember | 2,638 fcbc_AcquiredImpairedLoansEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fcbc_WaccamawResidentialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember
Allowance for Acquired Impaired Loans Evaluated | 94 fcbc_AllowanceForAcquiredImpairedLoansEvaluated / us-gaap_FinancialInstrumentAxis = fcbc_WaccamawResidentialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember |
Consumer Real Estate | Peoples Residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 1,201 fcbc_AcquiredImpairedLoansEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fcbc_PeoplesResidentialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember | 1,215 fcbc_AcquiredImpairedLoansEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fcbc_PeoplesResidentialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember
Allowance for Acquired Impaired Loans Evaluated | 20 fcbc_AllowanceForAcquiredImpairedLoansEvaluated / us-gaap_FinancialInstrumentAxis = fcbc_PeoplesResidentialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember | 21 fcbc_AllowanceForAcquiredImpairedLoansEvaluated / us-gaap_FinancialInstrumentAxis = fcbc_PeoplesResidentialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember
Consumer and Other | Waccamaw Consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment |  | $ 2 fcbc_AcquiredImpairedLoansEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fcbc_WaccamawConsumerMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerAndOtherPortfolioSegmentMember

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