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Amortized Cost, Fair Value, and Weighted-Average Yield of Securities by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Available-for-Sale    
Due within one year, Amortized cost $ 2,466us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Due after one year but within five years, Amortized cost 6,072us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Due after five years but within ten years, Amortized cost 53,293us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
Due after ten years, Amortized cost 168,379us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost  
Amortized Cost 332,942us-gaap_AvailableForSaleSecuritiesAmortizedCost 541,642us-gaap_AvailableForSaleSecuritiesAmortizedCost
Tax equivalent purchase yield 3.40%fcbc_AvailableForSaleSecuritiesDebtMaturitiesYield  
Average contractual maturity (in years) 11 years 7 months 13 days  
Due within one year, Fair value 2,470us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Due after one year but within five years, Fair value 6,232us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Due after five years but within ten years, Fair value 55,415us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Due after ten years, Fair value 159,642us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Fair Value 326,117us-gaap_AvailableForSaleSecurities 519,820us-gaap_AvailableForSaleSecurities
Due within one year, tax equivalent purchase yield 4.07%fcbc_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAverageYield [1]  
Due after one year through five years, tax equivalent purchase yield 6.04%fcbc_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAverageYield [1]  
Due after five years through ten years, tax equivalent purchase yield 4.55%fcbc_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAverageYield [1]  
Due after ten years, tax equivalent purchase yield 2.94%fcbc_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAverageYield [1]  
Held-to-Maturity    
Due within one year, Amortized cost 190us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount  
Due after one year but within five years, Amortized cost 57,758us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount  
Due after five years but within ten years, Amortized cost 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount  
Due after ten years, Amortized cost 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount  
Amortized Cost 57,948us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment 568us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
Tax equivalent purchase yield 1.17%fcbc_HeldToMaturitySecuritiesDebtMaturitiesAverageYield  
Average contractual maturity (in years) 2 years 11 months 12 days  
Held-to-maturity securities    
Due within one year, Fair value 193us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue  
Due after one year but within five years, Fair value 57,696us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Due after five years but within ten years, Fair value 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Due after ten years, Fair value 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue  
Total fair value 57,889us-gaap_HeldToMaturitySecuritiesFairValue 579us-gaap_HeldToMaturitySecuritiesFairValue
Due within one year, tax equivalent purchase yield 8.13%fcbc_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearAverageYield [1]  
Due after one year through five years, tax equivalent purchase yield 1.15%fcbc_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsAverageYield [1]  
Due after five years through ten years, tax equivalent purchase yield 0.00%fcbc_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsAverageYield [1]  
Due after ten years, tax equivalent purchase yield 0.00%fcbc_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsAverageYield [1]  
US Treasury Securities    
Held-to-Maturity    
Due after one year but within five years, Amortized cost 46,987us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember		  
Due after five years but within ten years, Amortized cost 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember		  
Due after ten years, Amortized cost 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember		  
Amortized Cost 46,987us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember		  
Tax equivalent purchase yield 1.01%fcbc_HeldToMaturitySecuritiesDebtMaturitiesAverageYield
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember		  
Average contractual maturity (in years) 2 years 9 months 29 days  
Held-to-maturity securities    
Due after one year but within five years, Fair value 46,955us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember		  
Due after five years but within ten years, Fair value 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember		  
Due after ten years, Fair value 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember		  
Total fair value 46,955us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember		  
Municipal securities    
Available-for-Sale    
Due within one year, Amortized cost 2,466us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_NontaxableMunicipalBondsMember		  
Due after one year but within five years, Amortized cost 6,069us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_NontaxableMunicipalBondsMember		  
Due after five years but within ten years, Amortized cost 45,137us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_NontaxableMunicipalBondsMember		  
Due after ten years, Amortized cost 81,112us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_NontaxableMunicipalBondsMember		  
Tax equivalent purchase yield 4.67%fcbc_AvailableForSaleSecuritiesDebtMaturitiesYield
/ us-gaap_InvestmentTypeAxis
= us-gaap_NontaxableMunicipalBondsMember		  
Average contractual maturity (in years) 9 years 10 months 21 days  
Due within one year, Fair value 2,470us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_NontaxableMunicipalBondsMember		  
Due after one year but within five years, Fair value 6,229us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_NontaxableMunicipalBondsMember		  
Due after five years but within ten years, Fair value 47,207us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_NontaxableMunicipalBondsMember		  
Due after ten years, Fair value 83,009us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_NontaxableMunicipalBondsMember		  
Held-to-Maturity    
Due within one year, Amortized cost 190us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount
/ us-gaap_InvestmentTypeAxis
= us-gaap_NontaxableMunicipalBondsMember		  
Due after one year but within five years, Amortized cost 189us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount
/ us-gaap_InvestmentTypeAxis
= us-gaap_NontaxableMunicipalBondsMember		  
Due after five years but within ten years, Amortized cost 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount
/ us-gaap_InvestmentTypeAxis
= us-gaap_NontaxableMunicipalBondsMember		  
Due after ten years, Amortized cost 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount
/ us-gaap_InvestmentTypeAxis
= us-gaap_NontaxableMunicipalBondsMember		  
Amortized Cost 379us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
/ us-gaap_InvestmentTypeAxis
= us-gaap_NontaxableMunicipalBondsMember		  
Tax equivalent purchase yield 8.17%fcbc_HeldToMaturitySecuritiesDebtMaturitiesAverageYield
/ us-gaap_InvestmentTypeAxis
= us-gaap_NontaxableMunicipalBondsMember		  
Average contractual maturity (in years) 9 months 29 days  
Held-to-maturity securities    
Due within one year, Fair value 193us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_NontaxableMunicipalBondsMember		  
Due after one year but within five years, Fair value 193us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_NontaxableMunicipalBondsMember		  
Due after five years but within ten years, Fair value 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_NontaxableMunicipalBondsMember		  
Due after ten years, Fair value 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_NontaxableMunicipalBondsMember		  
Total fair value 386us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_NontaxableMunicipalBondsMember		  
Corporate securities    
Available-for-Sale    
Due after five years but within ten years, Amortized cost 5,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember		  
Due after ten years, Amortized cost 55,822us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember		  
Tax equivalent purchase yield 1.45%fcbc_AvailableForSaleSecuritiesDebtMaturitiesYield
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember		  
Average contractual maturity (in years) 12 years 6 months 18 days  
Due after five years but within ten years, Fair value 5,109us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember		  
Due after ten years, Fair value 46,137us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember		  
Held-to-Maturity    
Due after one year but within five years, Amortized cost 10,582us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember		  
Due after five years but within ten years, Amortized cost 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember		  
Due after ten years, Amortized cost 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember		  
Amortized Cost 10,582us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember		  
Tax equivalent purchase yield 1.64%fcbc_HeldToMaturitySecuritiesDebtMaturitiesAverageYield
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember		  
Average contractual maturity (in years) 3 years 6 months 22 days  
Held-to-maturity securities    
Due after one year but within five years, Fair value 10,548us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember		  
Due after five years but within ten years, Fair value 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember		  
Due after ten years, Fair value 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember		  
Total fair value 10,548us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember		  
U.S. Agency securities    
Available-for-Sale    
Due after one year but within five years, Amortized cost 3us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_AgencySecuritiesMember		  
Due after five years but within ten years, Amortized cost 3,156us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_AgencySecuritiesMember		  
Due after ten years, Amortized cost 31,445us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_AgencySecuritiesMember		  
Tax equivalent purchase yield 1.95%fcbc_AvailableForSaleSecuritiesDebtMaturitiesYield
/ us-gaap_InvestmentTypeAxis
= us-gaap_AgencySecuritiesMember		  
Average contractual maturity (in years) 16 years 9 months 4 days  
Due after one year but within five years, Fair value 3us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_AgencySecuritiesMember		  
Due after five years but within ten years, Fair value 3,099us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_AgencySecuritiesMember		  
Due after ten years, Fair value 30,496us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_AgencySecuritiesMember		  
Total Mortgage Backed Securities    
Available-for-Sale    
Amortized Cost 102,506us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember		 318,862us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Tax equivalent purchase yield 1.49%fcbc_AvailableForSaleSecuritiesDebtMaturitiesYield
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember		 [1]  
Fair Value 102,119us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember		 310,175us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Equity Securities    
Available-for-Sale    
Amortized Cost 226us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		 5,259us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Tax equivalent purchase yield 8.20%fcbc_AvailableForSaleSecuritiesDebtMaturitiesYield
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		 [1]  
Fair Value 239us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		 5,247us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Debt Securities    
Available-for-Sale    
Amortized Cost 230,210us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		  
Fair Value 223,759us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		  
Debt Securities | Municipal securities    
Available-for-Sale    
Amortized Cost 134,784us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_NontaxableMunicipalBondsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		  
Fair Value 138,915us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_NontaxableMunicipalBondsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		  
Debt Securities | Corporate securities    
Available-for-Sale    
Amortized Cost 60,822us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		  
Fair Value 51,246us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		  
Debt Securities | U.S. Agency securities    
Available-for-Sale    
Amortized Cost 34,604us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_AgencySecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		  
Fair Value $ 33,598us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_AgencySecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		  
[1] Fully taxable equivalent at the rate of 35%.