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Note 4 - Credit Quality - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Collateral dependent loans	$ 1,156	$ 531
Collateral coverage	$ 1,956	$ 645
Collateral coverage percentage	169.14%	121.57%
Commercial Real Estate, Other [Member]
Collateral dependent loans	$ 0	$ 531
Collateral coverage	$ 0	$ 645
Collateral coverage percentage	0.00%	121.57%

X

- Definition

Represents the amount of collateral dependent loans as of the specified date.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the amount of collateral coverage associated with collateral dependent loans as of the specified date.

+ References

No definition available.

+ Details

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

X

- Definition

The percentage that expresses the extent to which collateral dependent loans are collateralized.

+ References

No definition available.

+ Details

Name:	fcbc_CollateralDependentLoansCollateralCoveragePercentage
Namespace Prefix:	fcbc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_CollateralAxis=fcbc_CommercialRealEstateOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: