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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 |
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Dec. 31, 2014 | Dec. 31, 2013
Available-for-Sale |  |  |
Due within one year, Amortized cost | $ 2,466 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost |  |
Due after one year but within five years, Amortized cost | 6,072 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost |  |
Due after five years but within ten years, Amortized cost | 53,293 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost |  |
Due after ten years, Amortized cost | 168,379 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost |  |
Amortized Cost | 332,942 us-gaap_AvailableForSaleSecuritiesAmortizedCost |  | 541,642 us-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 | 2,470 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue |  |
Due after one year but within five years, Fair value | 6,232 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue |  |
Due after five years but within ten years, Fair value | 55,415 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue |  |
Due after ten years, Fair value | 159,642 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue |  |
Fair Value | 326,117 us-gaap_AvailableForSaleSecurities |  | 519,820 us-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 | 190 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount |  |
Due after one year but within five years, Amortized cost | 57,758 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount |  |
Due after five years but within ten years, Amortized cost | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount |  |
Due after ten years, Amortized cost | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount |  |
Amortized Cost | 57,948 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment |  | 568 us-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 | 193 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue |  |
Due after one year but within five years, Fair value | 57,696 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue |  |
Due after five years but within ten years, Fair value | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue |  |
Due after ten years, Fair value | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue |  |
Total fair value | 57,889 us-gaap_HeldToMaturitySecuritiesFairValue |  | 579 us-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 | 46,987 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember |  |
Due after five years but within ten years, Amortized cost | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember |  |
Due after ten years, Amortized cost | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember |  |
Amortized Cost | 46,987 us-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 | 46,955 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember |  |
Due after five years but within ten years, Fair value | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember |  |
Due after ten years, Fair value | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember |  |
Total fair value | 46,955 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember |  |
Municipal securities |  |  |
Available-for-Sale |  |  |
Due within one year, Amortized cost | 2,466 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember |  |
Due after one year but within five years, Amortized cost | 6,069 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember |  |
Due after five years but within ten years, Amortized cost | 45,137 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember |  |
Due after ten years, Amortized cost | 81,112 us-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 | 2,470 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember |  |
Due after one year but within five years, Fair value | 6,229 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember |  |
Due after five years but within ten years, Fair value | 47,207 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember |  |
Due after ten years, Fair value | 83,009 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember |  |
Held-to-Maturity |  |  |
Due within one year, Amortized cost | 190 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember |  |
Due after one year but within five years, Amortized cost | 189 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember |  |
Due after five years but within ten years, Amortized cost | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember |  |
Due after ten years, Amortized cost | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember |  |
Amortized Cost | 379 us-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 | 193 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember |  |
Due after one year but within five years, Fair value | 193 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember |  |
Due after five years but within ten years, Fair value | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember |  |
Due after ten years, Fair value | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember |  |
Total fair value | 386 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember |  |
Corporate securities |  |  |
Available-for-Sale |  |  |
Due after five years but within ten years, Amortized cost | 5,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember |  |
Due after ten years, Amortized cost | 55,822 us-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 | 5,109 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember |  |
Due after ten years, Fair value | 46,137 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember |  |
Held-to-Maturity |  |  |
Due after one year but within five years, Amortized cost | 10,582 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember |  |
Due after five years but within ten years, Amortized cost | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember |  |
Due after ten years, Amortized cost | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember |  |
Amortized Cost | 10,582 us-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 | 10,548 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember |  |
Due after five years but within ten years, Fair value | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember |  |
Due after ten years, Fair value | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember |  |
Total fair value | 10,548 us-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 | 3 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember |  |
Due after five years but within ten years, Amortized cost | 3,156 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember |  |
Due after ten years, Amortized cost | 31,445 us-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 | 3 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember |  |
Due after five years but within ten years, Fair value | 3,099 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember |  |
Due after ten years, Fair value | 30,496 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember |  |
Total Mortgage Backed Securities |  |  |
Available-for-Sale |  |  |
Amortized Cost | 102,506 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember |  | 318,862 us-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 | 102,119 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember |  | 310,175 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember
Equity Securities |  |  |
Available-for-Sale |  |  |
Amortized Cost | 226 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |  | 5,259 us-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 | 239 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |  | 5,247 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Debt Securities |  |  |
Available-for-Sale |  |  |
Amortized Cost | 230,210 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember |  |
Fair Value | 223,759 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember |  |
Debt Securities | Municipal securities |  |  |
Available-for-Sale |  |  |
Amortized Cost | 134,784 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember |  |
Fair Value | 138,915 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember |  |
Debt Securities | Corporate securities |  |  |
Available-for-Sale |  |  |
Amortized Cost | 60,822 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember |  |
Fair Value | 51,246 us-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 | 34,604 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember |  |
Fair Value | $ 33,598 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember |  |
[1] | Fully taxable equivalent at the rate of 35%.

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