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Note 14 - Litigation, Commitments, and Contingencies (Details Textual) - Class Action Lawsuit [Member] - USD ($)	May 06, 2024	May 05, 2024
Loss Contingency Accrual	$ 4,800,000	$ 3,000,000
Litigation Settlement, Fee Expense Forgiven	$ 500,000

X

- Definition

Amount of litigation expense that is forgiven, including but not limited to legal, forensic, accounting, and investigative fees.

+ References

No definition available.

+ Details

Name:	fcbc_LitigationSettlementFeeExpenseForgiven
Namespace Prefix:	fcbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-10

+ Details

Name:	us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	srt_LitigationCaseAxis=fcbc_ClassActionLawsuitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: