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Fair Values of Company's Derivatives (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Derivative [Line Items]      
Derivative Assets $ 21us-gaap_DerivativeAssets $ 5us-gaap_DerivativeAssets $ 7us-gaap_DerivativeAssets
Derivative Liabilities 339us-gaap_DerivativeLiabilities 214us-gaap_DerivativeLiabilities 66us-gaap_DerivativeLiabilities
Derivatives Not Designated As Hedges      
Derivative [Line Items]      
Derivative Assets 21us-gaap_DerivativeAssets
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
5us-gaap_DerivativeAssets
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
7us-gaap_DerivativeAssets
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Derivative Liabilities 21us-gaap_DerivativeLiabilities
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
5us-gaap_DerivativeLiabilities
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
7us-gaap_DerivativeLiabilities
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Interest Rate Swaps Agreement | Designated as Hedging Instrument      
Derivative [Line Items]      
Derivative Liabilities 318us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
209us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
59us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
IRLCs | Derivatives Not Designated As Hedges      
Derivative [Line Items]      
Derivative Assets 21us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
5us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
 
Derivative Liabilities     7us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Forward Sale Loan Commitments | Derivatives Not Designated As Hedges      
Derivative [Line Items]      
Derivative Assets     7us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= fcbc_ForwardSalesCommitmentsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Derivative Liabilities $ 21us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= fcbc_ForwardSalesCommitmentsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
$ 5us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= fcbc_ForwardSalesCommitmentsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember