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Credit Quality - Additional information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Minimum commercial loan relationships to be reviewed by loan review function	$ 4,000,000fcbc_CommercialLoans
Restructured loans to borrowers experiencing financial difficulty in excess of	250,000fcbc_RestructuredLoansReserves
Performing status returned period	6 months
Allowance for loan losses	482,000fcbc_AllowanceForLoanLosses		475,000fcbc_AllowanceForLoanLosses
Interest income recognized on loan restructurings	148,000fcbc_InterestIncomeRecognizedOnLoanRestructurings	149,000fcbc_InterestIncomeRecognizedOnLoanRestructurings
Payment defaults related to loans modified as TDRs within the previous 12 months	0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Non Covered Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Accruing loans contractually past due 90 days or more	0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember		0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember
Covered Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Accruing loans contractually past due 90 days or more	$ 60,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember		$ 0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember
Waccamaw Bank
Financing Receivable, Allowance for Credit Losses [Line Items]
Percentage of loan and foreclosed real estate losses covered by FDIC	80.00%fcbc_PercentageOfLossCoveredByFdic / us-gaap_BusinessAcquisitionAxis = fcbc_WaccamawBankMember
PCI loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of impaired loans	2fcbc_LoansAndLeasesReceivableImpairedNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember	3fcbc_LoansAndLeasesReceivableImpairedNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember	2fcbc_LoansAndLeasesReceivableImpairedNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember
Number of loans	6fcbc_FinancingReceivableNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember	7fcbc_FinancingReceivableNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember	7fcbc_FinancingReceivableNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember

X

- Definition

Allowance for loan losses.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Total commercial loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Financing Receivable Number Of Loans

+ References

No definition available.

+ Details

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Namespace Prefix:	fcbc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Interest income recognized on loan restructurings.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Loans And Leases Receivable Impaired Number Of Loans

+ References

No definition available.

+ Details

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Namespace Prefix:	fcbc_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

Percentage of loss covered by FDIC.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcbc_
Data Type:	num:percentItemType
Balance Type:	na
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X

- Definition

Performing status returned period.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcbc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Restructured loans reserves.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524

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- Details

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- Details

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X

- Details

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- Details

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