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Amortized Cost and Fair Value of Municipal Securities by State, Including Gross Unrealized Gains and Losses (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 332,942 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 541,642 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Fair Value | 326,117 us-gaap_AvailableForSaleSecurities | 519,820 us-gaap_AvailableForSaleSecurities
Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 100.00%fcbc_MunicipalBondsPortfolioCarryingValuePercentage / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 100.00%fcbc_MunicipalBondsPortfolioCarryingValuePercentage / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Amortized Cost | 135,163 us-gaap_AvailableForSaleSecuritiesAmortizedCost / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 147,617 us-gaap_AvailableForSaleSecuritiesAmortizedCost / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Unrealized Gains | 4,830 fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 1,879 fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Unrealized Losses | (692)fcbc_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | (4,637)fcbc_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Fair Value | 139,301 us-gaap_AvailableForSaleSecurities / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 144,859 us-gaap_AvailableForSaleSecurities / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
New York | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 10.62%fcbc_MunicipalBondsPortfolioCarryingValuePercentage / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_NY / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 11.34%fcbc_MunicipalBondsPortfolioCarryingValuePercentage / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_NY / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Amortized Cost | 14,064 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_NY / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 16,161 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_NY / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Unrealized Gains | 730 fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_NY / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 294 fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_NY / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Unrealized Losses |  | (28)fcbc_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_NY / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Fair Value | 14,794 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_NY / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 16,427 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_NY / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Minnesota | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 8.34%fcbc_MunicipalBondsPortfolioCarryingValuePercentage / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_MN / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 8.56%fcbc_MunicipalBondsPortfolioCarryingValuePercentage / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_MN / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Amortized Cost | 11,188 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_MN / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 12,504 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_MN / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Unrealized Gains | 463 fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_MN / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 174 fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_MN / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Unrealized Losses | (30)fcbc_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_MN / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | (279)fcbc_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_MN / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Fair Value | 11,621 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_MN / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 12,399 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_MN / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
New Jersey | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 7.96%fcbc_MunicipalBondsPortfolioCarryingValuePercentage / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_NJ / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 8.18%fcbc_MunicipalBondsPortfolioCarryingValuePercentage / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_NJ / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Amortized Cost | 10,567 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_NJ / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 11,565 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_NJ / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Unrealized Gains | 515 fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_NJ / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 306 fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_NJ / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Unrealized Losses |  | (25)fcbc_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_NJ / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Fair Value | 11,082 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_NJ / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 11,846 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_NJ / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Connecticut | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 8.02%fcbc_MunicipalBondsPortfolioCarryingValuePercentage / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_CT / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 7.86%fcbc_MunicipalBondsPortfolioCarryingValuePercentage / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_CT / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Amortized Cost | 10,775 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_CT / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 11,406 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_CT / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Unrealized Gains | 393 fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_CT / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 91 fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_CT / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Unrealized Losses |  | (109)fcbc_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_CT / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Fair Value | 11,168 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_CT / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 11,388 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_CT / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Wisconsin | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 8.30%fcbc_MunicipalBondsPortfolioCarryingValuePercentage / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_WI / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 7.83%fcbc_MunicipalBondsPortfolioCarryingValuePercentage / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_WI / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Amortized Cost | 11,340 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_WI / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 11,815 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_WI / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Unrealized Gains | 244 fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_WI / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 118 fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_WI / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Unrealized Losses | (16)fcbc_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_WI / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | (584)fcbc_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_WI / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Fair Value | 11,568 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_WI / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 11,349 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_WI / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Ohio | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 8.14%fcbc_MunicipalBondsPortfolioCarryingValuePercentage / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_OH / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 7.45%fcbc_MunicipalBondsPortfolioCarryingValuePercentage / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_OH / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Amortized Cost | 11,145 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_OH / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 11,299 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_OH / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Unrealized Gains | 337 fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_OH / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 135 fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_OH / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Unrealized Losses | (148)fcbc_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_OH / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | (637)fcbc_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_OH / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Fair Value | 11,334 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_OH / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 10,797 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_OH / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Massachusetts | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 7.18%fcbc_MunicipalBondsPortfolioCarryingValuePercentage / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_MA / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 6.85%fcbc_MunicipalBondsPortfolioCarryingValuePercentage / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_MA / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Amortized Cost | 9,653 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_MA / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 10,102 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_MA / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Unrealized Gains | 393 fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_MA / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 119 fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_MA / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Unrealized Losses | (38)fcbc_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_MA / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | (295)fcbc_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_MA / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Fair Value | 10,008 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_MA / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 9,926 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_MA / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Texas | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 6.35%fcbc_MunicipalBondsPortfolioCarryingValuePercentage / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_TX / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 6.24%fcbc_MunicipalBondsPortfolioCarryingValuePercentage / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_TX / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Amortized Cost | 8,770 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_TX / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 9,483 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_TX / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Unrealized Gains | 214 fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_TX / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 134 fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_TX / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Unrealized Losses | (133)fcbc_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_TX / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | (576)fcbc_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_TX / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Fair Value | 8,851 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_TX / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 9,041 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stpr_TX / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Other | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 35.09%fcbc_MunicipalBondsPortfolioCarryingValuePercentage / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = fcbc_OtherStatesMember / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 35.68%fcbc_MunicipalBondsPortfolioCarryingValuePercentage / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = fcbc_OtherStatesMember / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Amortized Cost | 47,661 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = fcbc_OtherStatesMember / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 53,282 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = fcbc_OtherStatesMember / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Unrealized Gains | 1,541 fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = fcbc_OtherStatesMember / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | 508 fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = fcbc_OtherStatesMember / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Unrealized Losses | (327)fcbc_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = fcbc_OtherStatesMember / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | (2,104)fcbc_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = fcbc_OtherStatesMember / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember
Fair Value | $ 48,875 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = fcbc_OtherStatesMember / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember | $ 51,686 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = fcbc_OtherStatesMember / fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis = fcbc_StateAndMunicipalSecuritiesMember

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