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Aggregate Contractual or Notional Amounts of Derivative Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Feb. 28, 2014	Oct. 31, 2013
Derivative [Line Items]
Notional or Contractual Amount	$ 16,332invest_DerivativeNotionalAmount	$ 8,937invest_DerivativeNotionalAmount	$ 13,693invest_DerivativeNotionalAmount
Derivatives Not Designated As Hedges
Derivative [Line Items]
Notional or Contractual Amount	10,728invest_DerivativeNotionalAmount / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	4,574invest_DerivativeNotionalAmount / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	5,821invest_DerivativeNotionalAmount / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Interest Rate Swaps Agreement
Derivative [Line Items]
Notional or Contractual Amount	1,200invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember			4,370invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember	3,500invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Interest Rate Swaps Agreement | Designated as Hedging Instrument
Derivative [Line Items]
Notional or Contractual Amount	5,604invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	4,363invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	7,872invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
IRLCs | Derivatives Not Designated As Hedges
Derivative [Line Items]
Notional or Contractual Amount	4,777invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	1,391invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	2,039invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Forward Sale Loan Commitments | Derivatives Not Designated As Hedges
Derivative [Line Items]
Notional or Contractual Amount	$ 5,951invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = fcbc_ForwardSalesCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	$ 3,183invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = fcbc_ForwardSalesCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	$ 3,782invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = fcbc_ForwardSalesCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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Period Type:	instant

X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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