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v3.25.3

Note 4 - Credit Quality (Details Textual) Pure in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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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