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Note 5 - Credit Quality (Details Textual) Pure in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)
Financing Receivable, Nonaccrual, Interest Income	$ 0	$ 0
Financing Receivable, Modified, Number of Loans Uncollectible	0

X

- Definition

Number of modified loans that are uncollectible.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of interest income on financing receivable on nonaccrual status.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

+ Details

Name:	us-gaap_FinancingReceivableNonaccrualInterestIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration