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Note 19 - Litigation, Commitments, and Contingencies (Details Textual) - Class Action Lawsuit [Member] - USD ($) | May 06, 2024 | May 05, 2024
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Loss Contingency Accrual | $ 4,800,000 | $ 3,000,000
Litigation Settlement, Fee Expense Forgiven | $ 500,000 |

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- Definition Amount of litigation expense that is forgiven, including but not limited to legal, forensic, accounting, and investigative fees. + References No definition available. + Details
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Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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

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