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Note 6 - FDIC Indemnification Asset (Details Textual) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Loans and Leases Receivable, Gross, Carrying Amount, Covered | $ 20,483 | $ 27,948
Other Real Estate, Covered, Ending Balance | $ 44 | $ 105
Percentage of Loss Covered by FDIC | 80.00% |

X
- Definition Represents the percentage of loss covered by the FDIC. + References No definition available. + Details
Name: | fcbc_PercentageOfLossCoveredByFDIC
Namespace Prefix: | fcbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Aggregate gross carrying amount of loans and leases receivable covered by loss sharing agreements. + References No definition available. + Details
Name: | us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount of other real estate 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_OtherRealEstateCovered
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant