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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
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 332,942us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 541,642us-gaap_AvailableForSaleSecuritiesAmortizedCost
Fair Value 326,117us-gaap_AvailableForSaleSecurities 519,820us-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 135,163us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
147,617us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
Unrealized Gains 4,830fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
1,879fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
Unrealized Losses (692)fcbc_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
(4,637)fcbc_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
Fair Value 139,301us-gaap_AvailableForSaleSecurities
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
144,859us-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 14,064us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_NY
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
16,161us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_NY
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
Unrealized Gains 730fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_NY
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
294fcbc_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 14,794us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_NY
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
16,427us-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 11,188us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_MN
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
12,504us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_MN
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
Unrealized Gains 463fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_MN
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
174fcbc_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 11,621us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_MN
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
12,399us-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 10,567us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_NJ
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
11,565us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_NJ
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
Unrealized Gains 515fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_NJ
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
306fcbc_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 11,082us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_NJ
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
11,846us-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 10,775us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_CT
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
11,406us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_CT
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
Unrealized Gains 393fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_CT
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
91fcbc_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 11,168us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_CT
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
11,388us-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 11,340us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_WI
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
11,815us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_WI
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
Unrealized Gains 244fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_WI
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
118fcbc_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 11,568us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_WI
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
11,349us-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 11,145us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_OH
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
11,299us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_OH
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
Unrealized Gains 337fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_OH
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
135fcbc_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 11,334us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_OH
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
10,797us-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 9,653us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_MA
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
10,102us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_MA
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
Unrealized Gains 393fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_MA
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
119fcbc_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 10,008us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_MA
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
9,926us-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 8,770us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_TX
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
9,483us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_TX
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
Unrealized Gains 214fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_TX
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
134fcbc_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 8,851us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= stpr_TX
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
9,041us-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 47,661us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fcbc_OtherStatesMember
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
53,282us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fcbc_OtherStatesMember
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
Unrealized Gains 1,541fcbc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fcbc_OtherStatesMember
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
508fcbc_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 $ 48,875us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fcbc_OtherStatesMember
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember
$ 51,686us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fcbc_OtherStatesMember
/ fcbc_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesMajorTypesOfSecuritiesAxis
= fcbc_StateAndMunicipalSecuritiesMember