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Note 4 - Credit Quality (Details Textual) Pure in Thousands	Jun. 30, 2025	Dec. 31, 2024
Financing Receivable, Modified, Number of Loans Uncollectible	0	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