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Credit Quality - Additional information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Loan	Dec. 31, 2014 USD ($) Loan	Dec. 31, 2013 Loan
Financing Receivable, Allowance for Credit Losses [Line Items]
Minimum commercial loan relationships to be reviewed by loan review function	$ 4,000
Restructured loans to borrowers experiencing financial difficulty in excess of	$ 250
Performing status returned period	6 months
Allowance for loan losses	$ 590	$ 475
PCI loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of impaired loans | Loan	2	2	4
Number of loans | Loan	6	7	7
Waccamaw Bank
Financing Receivable, Allowance for Credit Losses [Line Items]
Percentage of loan and foreclosed real estate losses covered by FDIC	80.00%

X

- Definition

Allowance for loan losses.

+ References

No definition available.

+ Details

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

X

- Definition

Total commercial loans.

+ References

No definition available.

+ Details

Name:	fcbc_CommercialLoans
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

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

X

- Definition

Loans And Leases Receivable Impaired Number Of Loans

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of loss covered by FDIC.

+ References

No definition available.

+ Details

Name:	fcbc_PercentageOfLossCoveredByFdic
Namespace Prefix:	fcbc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Performing status returned period.

+ References

No definition available.

+ Details

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

X

- Definition

Restructured loans reserves.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fcbc_PurchasedCreditImpairedLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=fcbc_WaccamawBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: