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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Common dividends declared, per share (in dollars per share)	$ 0.29	$ 0.29
Repurchase of common shares, per share (in dollars per share)	$ 33.26

X

- Definition

Represents price per share for stock repurchased and retired during period.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcbc_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration