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Significant Components of Net Deferred Tax Asset (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Allowance for loan losses $ 7,519us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses $ 9,209us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses
Unrealized losses on available-for-sale securities 2,560us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross 8,184us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross
Unrealized asset losses 4,477us-gaap_DeferredTaxAssetsUnrealizedLossesOnTradingSecurities 8,018us-gaap_DeferredTaxAssetsUnrealizedLossesOnTradingSecurities
Purchase accounting 5,343fcbc_DeferredTaxAssetsPurchaseAccounting 6,796fcbc_DeferredTaxAssetsPurchaseAccounting
FDIC assisted transactions 6,582fcbc_DeferredTaxAssetsFederalDepositInsuranceCompanyTransaction 6,753fcbc_DeferredTaxAssetsFederalDepositInsuranceCompanyTransaction
Intangible assets 7,584us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 6,384us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Deferred compensation assets 4,421us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 4,224us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Alternative minimum tax credit   1,849us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Other deferred tax assets 6,427us-gaap_DeferredTaxAssetsOther 2,670us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 44,913us-gaap_DeferredTaxAssetsNet 54,087us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
FDIC indemnification asset 12,548fcbc_DeferredTaxLiabilitiesFederalDepositInsuranceCompanyTransaction 12,155fcbc_DeferredTaxLiabilitiesFederalDepositInsuranceCompanyTransaction
Fixed assets 2,453us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 2,199us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Odd days interest deferral 2,007us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInterest 1,958us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInterest
Other 442us-gaap_DeferredTaxLiabilitiesOther 1,066us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities 17,450us-gaap_DeferredIncomeTaxLiabilities 17,378us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax asset $ 27,463us-gaap_DeferredTaxAssetsLiabilitiesNet $ 36,709us-gaap_DeferredTaxAssetsLiabilitiesNet