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Note 2 - Acquisitions and Divestitures - Divestitures (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Book value of assets sold |  | $ (1,685) |
Book value of liabilities sold |  | 37 |
Sales price in excess of net liabilities assumed |  |  |
Total sales price |  | (1,648) |
Cash sold |  | 35 |
Non-cash sales price |  | 1,603 |
Amount due remaining on books |  |  |
Net cash received in divestitures |  | $ (10) |

X
- Definition Amount classified as assets sold (acquired) attributable to disposal group held for sale or disposed of. + References No definition available. + Details
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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
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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
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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
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Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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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
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Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition Represents the sales price in excess of the net liabilities assumed in an acquisition. + References No definition available. + Details
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Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
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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=118932676&loc=d3e3213-108585 + Details
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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=98513485&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=98513485&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=98513485&loc=d3e4313-108586 + Details
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