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Note 21 - Regulatory Requirements and Restrictions (Details Textual)	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2019	Jan. 01, 2016
Capital Conservation Buffer			0.625%
Tier One Capital Securities Phase Out Period	4 years
Capital Conservation Buffer Phase In Amount	0.625%
Scenario, Forecast [Member]
Capital Conservation Buffer		2.50%

X

- Definition

An additional amount held in risk-based capital designed to ensure that banks build up capital buffers outside periods of stress which can be drawn down as losses are incurred. The requirement is based on simple capital conservation rules designed to avoid breaches of minimum capital requirements.

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No definition available.

+ Details

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Namespace Prefix:	fcbc_
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Period Type:	instant

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- Definition

Amount resulting from the phase-in of a capital conservation buffer.

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No definition available.

+ Details

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

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- Definition

Represents the phase out period for Tier 1 capital securities.

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No definition available.

+ Details

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

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- Details

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Namespace Prefix:
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Period Type: