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Note 4 - Credit Quality - Other Real Estate Owned (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
OREO |  | $ 264 | $ 521
OREO secured by residential real estate |  | 264 | 521
Residential real estate loans in the foreclosure process | [1] | $ 1,499 | $ 2,625
[1] | The recorded investment in consumer mortgage loans collateralized by residential real estate that are in the process of foreclosure according to local requirements of the applicable jurisdiction

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- Definition Represents the amount of non-covered other real estate owned secured by residential real estate. + References No definition available. + Details
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Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 35 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-35 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Carrying amount of other real estate not covered by loss sharing agreements not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations that may also be included in real estate owned. Excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure by banks. + References No definition available. + Details
Name: | us-gaap_OtherRealEstateNonCovered
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant