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Recorded Investment Unpaid Principal Balance and Related Allowance for Loans losses Excluding Purchased Credit Impaired Loans (Parenthetical) (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Loans collectively evaluated for impairment, recorded investment	$ 16,890	$ 14,220

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- Definition

Financing Receivable, Collectively Evaluated for Impairment Recorded Investment

+ References

No definition available.

+ Details

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

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