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Investment Securities - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2015	Dec. 31, 2014 Securities
Schedule of Available-for-sale Securities [Line Items]
Number of securities in an unrealized loss position		92fcbc_NumberOfSecuritiesInUnrealizedLossPosition	97fcbc_NumberOfSecuritiesInUnrealizedLossPosition
Percentage of combined depreciation of the combined reported value of the aggregate securities portfolio		2.56%fcbc_PercentageOfCombinedDepreciationOfCombinedReportedValueOfAggregateSecuritiesPortfolio	3.21%fcbc_PercentageOfCombinedDepreciationOfCombinedReportedValueOfAggregateSecuritiesPortfolio
Carrying value of available-for-sale securities as security for various purposes		$ 261,070,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral	$ 268,780,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
OTTI charges incurred	264,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
OTTI charges incurred	0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember	0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember
Non Agency Mortgage Backed Securities
Schedule of Available-for-sale Securities [Line Items]
OTTI charges incurred	232,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = fcbc_NonAgencyMortgageBackedSecuritiesMember	0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = fcbc_NonAgencyMortgageBackedSecuritiesMember
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
OTTI charges incurred	$ 32,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember	$ 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember

X

- Definition

Number of securities in an unrealized loss position.

+ References

No definition available.

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- Definition

Percentage of combined depreciation of the combined reported value of the aggregate securities portfolio.

+ References

No definition available.

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X

- Definition

The fair value of available-for-sale securities that serve as collateral for borrowings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5086-111524

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- Definition

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 8B

-URI http://asc.fasb.org/extlink&oid=27724398&loc=SL6284393-111563

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