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Quantitative Information for Assets Measured at Fair Value on Nonrecurring Basis (Detail) (Fair Value on Nonrecurring Basis)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Impaired Loans
   
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Valuation Technique Discounted appraisals [1]  
Unobservable Input Appraisal adjustments [2]  
OREO | Not covered by loss share agreements
   
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Valuation Technique Discounted appraisals [1]  
Unobservable Input Appraisal adjustments [2]  
OREO | Covered by loss share agreements
   
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Valuation Technique Discounted appraisals [1]  
Unobservable Input Appraisal adjustments [2]  
Minimum | Impaired Loans    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 1.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= fcbc_ImpairedLoansMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
6.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= fcbc_ImpairedLoansMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Minimum | OREO | Not covered by loss share agreements    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 10.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
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0.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= fcbc_OreoMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= fcbc_ScenarioOneMember
Minimum | OREO | Covered by loss share agreements    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 10.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= fcbc_OreoMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= fcbc_ScenarioTwoMember
4.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= fcbc_OreoMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= fcbc_ScenarioTwoMember
Maximum | Impaired Loans    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 33.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= fcbc_ImpairedLoansMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
100.00%us-gaap_FairValueInputsDiscountRate
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= fcbc_ImpairedLoansMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Maximum | OREO | Not covered by loss share agreements    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 47.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= fcbc_ScenarioOneMember
65.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_RangeAxis
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/ us-gaap_StatementScenarioAxis
= fcbc_ScenarioOneMember
Maximum | OREO | Covered by loss share agreements    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 52.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= fcbc_OreoMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
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70.00%us-gaap_FairValueInputsDiscountRate
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_RangeAxis
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/ us-gaap_StatementScenarioAxis
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Average | Impaired Loans    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 22.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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47.00%us-gaap_FairValueInputsDiscountRate
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
Average | OREO | Not covered by loss share agreements    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 26.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_RangeAxis
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/ us-gaap_StatementScenarioAxis
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34.00%us-gaap_FairValueInputsDiscountRate
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_RangeAxis
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/ us-gaap_StatementScenarioAxis
= fcbc_ScenarioOneMember
Average | OREO | Covered by loss share agreements    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Weighted Average 44.00%us-gaap_FairValueInputsDiscountRate
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_StatementScenarioAxis
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41.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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[1] Fair value is generally based on appraisals of the underlying collateral.
[2] Appraisals may be adjusted by management for customized discounting criteria, estimated sales costs, and proprietary qualitative adjustments.