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Average Recorded Investment and Interest Income Recognized on Impaired Loans Excluding Purchased Credit Impaired Loans (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Impaired loans with no related allowance, Average Recorded Investment $ 12,891us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment $ 9,359us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment
Impaired loans with a related allowance, Average Recorded Investment 6,799us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment 20,340us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment
Total impaired loans, Average Recorded Investment 19,690us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment 29,699us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Impaired loans with no related allowance, Interest Income Recognized 264us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod 113us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod
Impaired loans with a related allowance, Interest Income Recognized 31us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod 130us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
Total impaired loans, Interest Income Recognized 295us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod 243us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Commercial Loans | Commercial and Industrial    
Financing Receivable, Recorded Investment [Line Items]    
Impaired loans with no related allowance, Average Recorded Investment   292us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fcbc_CommercialAndIndustrialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Impaired loans with a related allowance, Average Recorded Investment   5,157us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fcbc_CommercialAndIndustrialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Impaired loans with no related allowance, Interest Income Recognized   12us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= fcbc_CommercialAndIndustrialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Impaired loans with a related allowance, Interest Income Recognized   47us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= fcbc_CommercialAndIndustrialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Loans | Single-family Non-owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Impaired loans with no related allowance, Average Recorded Investment 459us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fcbc_SingleFamilyNonOwnerOccupiedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 420us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fcbc_SingleFamilyNonOwnerOccupiedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Impaired loans with a related allowance, Average Recorded Investment 361us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fcbc_SingleFamilyNonOwnerOccupiedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 372us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fcbc_SingleFamilyNonOwnerOccupiedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Impaired loans with no related allowance, Interest Income Recognized 1us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= fcbc_SingleFamilyNonOwnerOccupiedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 1us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= fcbc_SingleFamilyNonOwnerOccupiedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Impaired loans with a related allowance, Interest Income Recognized 2us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= fcbc_SingleFamilyNonOwnerOccupiedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 1us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= fcbc_SingleFamilyNonOwnerOccupiedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Loans | Non-farm, Non-residential    
Financing Receivable, Recorded Investment [Line Items]    
Impaired loans with no related allowance, Average Recorded Investment 8,792us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fcbc_NonFarmNonResidentialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 5,918us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fcbc_NonFarmNonResidentialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Impaired loans with a related allowance, Average Recorded Investment 4,064us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fcbc_NonFarmNonResidentialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 4,399us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fcbc_NonFarmNonResidentialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Impaired loans with no related allowance, Interest Income Recognized 163us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= fcbc_NonFarmNonResidentialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 36us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= fcbc_NonFarmNonResidentialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Impaired loans with a related allowance, Interest Income Recognized 19us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= fcbc_NonFarmNonResidentialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 25us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= fcbc_NonFarmNonResidentialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Loans | Farmland Loan    
Financing Receivable, Recorded Investment [Line Items]    
Impaired loans with no related allowance, Average Recorded Investment   363us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fcbc_FarmlandMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Impaired loans with no related allowance, Interest Income Recognized   11us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= fcbc_FarmlandMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Loans | Multi-family Residential    
Financing Receivable, Recorded Investment [Line Items]    
Impaired loans with a related allowance, Average Recorded Investment   5,603us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fcbc_MultiFamilyResidentialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Impaired loans with a related allowance, Interest Income Recognized   22us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= fcbc_MultiFamilyResidentialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Consumer Real Estate | Home Equity Lines    
Financing Receivable, Recorded Investment [Line Items]    
Impaired loans with no related allowance, Average Recorded Investment   265us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcbc_ConsumerRealEstateMember
Impaired loans with a related allowance, Average Recorded Investment   229us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcbc_ConsumerRealEstateMember
Impaired loans with no related allowance, Interest Income Recognized   2us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcbc_ConsumerRealEstateMember
Impaired loans with a related allowance, Interest Income Recognized   1us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcbc_ConsumerRealEstateMember
Consumer Real Estate | Single Family Owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Impaired loans with no related allowance, Average Recorded Investment 3,640us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fcbc_SingleFamilyOwnerOccupiedLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcbc_ConsumerRealEstateMember		 2,101us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fcbc_SingleFamilyOwnerOccupiedLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcbc_ConsumerRealEstateMember
Impaired loans with a related allowance, Average Recorded Investment 2,374us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fcbc_SingleFamilyOwnerOccupiedLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcbc_ConsumerRealEstateMember		 4,580us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fcbc_SingleFamilyOwnerOccupiedLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcbc_ConsumerRealEstateMember
Impaired loans with no related allowance, Interest Income Recognized 100us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= fcbc_SingleFamilyOwnerOccupiedLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcbc_ConsumerRealEstateMember		 51us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= fcbc_SingleFamilyOwnerOccupiedLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcbc_ConsumerRealEstateMember
Impaired loans with a related allowance, Interest Income Recognized $ 10us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= fcbc_SingleFamilyOwnerOccupiedLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcbc_ConsumerRealEstateMember		 $ 34us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= fcbc_SingleFamilyOwnerOccupiedLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcbc_ConsumerRealEstateMember