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Aggregate Contractual or Notional Amounts of Derivative Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Feb. 28, 2014 | Oct. 31, 2013
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Derivative [Line Items] |  |  |  |
Notional or Contractual Amount | $ 8,937 invest_DerivativeNotionalAmount | $ 11,690 invest_DerivativeNotionalAmount |  |
Derivative Assets | 5 us-gaap_DerivativeAssets | 84 us-gaap_DerivativeAssets |  |
Derivative Liabilities | 214 us-gaap_DerivativeLiabilities | 41 us-gaap_DerivativeLiabilities |  |
Derivatives Not Designated As Hedges |  |  |  |
Derivative [Line Items] |  |  |  |
Notional or Contractual Amount | 4,574 invest_DerivativeNotionalAmount / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 8,237 invest_DerivativeNotionalAmount / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |
Derivative Assets | 5 us-gaap_DerivativeAssets / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 41 us-gaap_DerivativeAssets / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |
Derivative Liabilities | 5 us-gaap_DerivativeLiabilities / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 41 us-gaap_DerivativeLiabilities / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |
Interest Rate Swaps Agreement |  |  |  |
Derivative [Line Items] |  |  |  |
Notional or Contractual Amount |  |  | 4,370 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 3,500 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Interest Rate Swaps Agreement | Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Notional or Contractual Amount | 4,363 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 3,453 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |
Derivative Assets |  | 43 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |
Derivative Liabilities | 209 us-gaap_DerivativeLiabilities / 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 | 1,391 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 3,677 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |
Derivative Assets | 5 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |  |
Derivative Liabilities |  | 41 us-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] |  |  |  |
Notional or Contractual Amount | 3,183 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = fcbc_ForwardSalesCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 4,560 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = fcbc_ForwardSalesCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |
Derivative Assets |  | 41 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = fcbc_ForwardSalesCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |
Derivative Liabilities | $ 5 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = fcbc_ForwardSalesCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |  |

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- 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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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 + Details
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