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Note 5 - Credit Quality - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Collateral dependent loans	$ 1,203	$ 589
Collateral coverage	$ 825	$ 574
Collateral coverage percentage	68.58%	97.45%
Commercial Real Estate, Hotel 1 [Member]
Collateral dependent loans	$ 0	$ 0
Collateral coverage	$ 0	$ 0
Collateral coverage percentage	0.00%	0.00%
Commercial Real Estate, Office [Member]
Collateral dependent loans	$ 0	$ 0
Collateral coverage	$ 0	$ 0
Collateral coverage percentage	0.00%	0.00%
Commercial Real Estate, Other [Member]
Collateral dependent loans	$ 1,203	$ 0
Collateral coverage	$ 825	$ 0
Collateral coverage percentage	68.58%	0.00%
Commercial Real Estate, Retail [Member]
Collateral dependent loans	$ 0	$ 0
Collateral coverage	$ 0	$ 0
Collateral coverage percentage	0.00%	0.00%
Multi-family, Industrial [Member]
Collateral dependent loans	$ 0	$ 0
Collateral coverage	$ 0	$ 0
Collateral coverage percentage	0.00%	0.00%
Multi-family, Office [Member]
Collateral dependent loans	$ 0	$ 0
Collateral coverage	$ 0	$ 0
Collateral coverage percentage	0.00%	0.00%
Multi-family, Other [Member]
Collateral dependent loans	$ 0	$ 0
Collateral coverage	$ 0	$ 0
Collateral coverage percentage	0.00%	0.00%
Commercial and Industrial, Industrial [Member]
Collateral dependent loans	$ 0	$ 0
Collateral coverage	$ 0	$ 0
Collateral coverage percentage	0.00%	0.00%
Commercial and Industrial, Other [Member]
Collateral dependent loans	$ 0	$ 0
Collateral coverage	$ 0	$ 0
Collateral coverage percentage	0.00%	0.00%
Consumer Owner Occupied, Other [Member]
Collateral dependent loans	$ 0	$ 0
Collateral coverage	$ 0	$ 0
Collateral coverage percentage	0.00%	0.00%
Consumer, Other [Member]
Collateral dependent loans	$ 0	$ 589
Collateral coverage	$ 0	$ 574
Collateral coverage percentage	0.00%	97.45%

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_CommercialRealEstateHotel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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