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Note 2 - Acquisitions and Divestitures - Divestitures (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Book value of assets sold | $ 0 | $ 0 | $ (1,685)
Book value of liabilities sold | 0 | 0 | 37
Sales price in excess of net liabilities assumed | 0 | 0 | 0
Total sales price | 0 | 0 | (1,648)
Cash sold | 0 | 0 | 35
Non-cash sales price | 0 | 0 | 1,603
Amount due remaining on books | 0 | 0 | 0
Net cash received in divestitures | $ 0 | $ 0 | $ (10)

X
- Definition Amount classified as assets sold (acquired) attributable to disposal group held for sale or disposed of. + References No definition available. + Details
Name: | fcbc_DisposalGroupIncludingDiscontinuedOperationAssetsSoldAcquired
Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount classified as liabilities sold (incurred) attributable to disposal group held for sale or disposed of + References No definition available. + Details
Name: | fcbc_DisposalGroupIncludingDiscontinuedOperationLiabilitiesSoldIncurred
Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cash outflow or inflow associated with the amount paid or received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References No definition available. + Details
Name: | fcbc_PaymentsForProceedsFromDivestitureOfBusinesses
Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow or inflow associated with the divestiture of businesses, net of cash divested. + References No definition available. + Details
Name: | fcbc_PaymentsForProceedsFromDivestitureOfBusinessesNetOfCashDivested
Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of receivable due from or payable due to as part of consideration transferred in a divestiture of business. + References No definition available. + Details
Name: | fcbc_ReceivableDueFromPayableDueToDivestitureOfBusinesses
Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the sales price in excess of the net liabilities assumed in an acquisition. + References No definition available. + Details
Name: | fcbc_SalesPriceInExcessOfNetLiabilitiesAssumed
Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Reduction in cash due to no longer including the former subsidiary's cash in the consolidated entity's cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
Name: | us-gaap_CashDivestedFromDeconsolidation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of noncash consideration received for selling an asset or business through a noncash (or part noncash) transaction. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration