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Litigation, Commitments and Contingencies - Additional Information (Detail) $ in Thousands	Sep. 30, 2016 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Trust preferred securities	$ 15,460

X

- Definition

Commitments and Contingencies Disclosure [Line Items]

+ References

No definition available.

+ Details

Name:	fcbc_CommitmentsAndContingenciesDisclosureLineItems
Namespace Prefix:	fcbc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Trust preferred securities.

+ References

No definition available.

+ Details

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