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Credit Quality - Additional information (Detail) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 USD ($) Loan | Dec. 31, 2014 USD ($) Loan | Dec. 31, 2013 Loan
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Minimum commercial loan relationships to be reviewed by loan review function | $ 4,000 |  |
Restructured loans to borrowers experiencing financial difficulty in excess of | $ 250 |  |
Performing status returned period | 6 months |  |
Allowance for loan losses | $ 590 | $ 475 |
PCI loans |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Number of impaired loans | Loan | 2 | 2 | 4
Number of loans | Loan | 6 | 7 | 7
Waccamaw Bank |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Percentage of loan and foreclosed real estate losses covered by FDIC | 80.00% |  |

X
- Definition Allowance for loan losses. + References No definition available. + Details
Name: | fcbc_AllowanceForLoanLosses
Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total commercial loans. + References No definition available. + Details
Name: | fcbc_CommercialLoans
Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Financing Receivable Number Of Loans + References No definition available. + Details
Name: | fcbc_FinancingReceivableNumberOfLoans
Namespace Prefix: | fcbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loans And Leases Receivable Impaired Number Of Loans + References No definition available. + Details
Name: | fcbc_LoansAndLeasesReceivableImpairedNumberOfLoans
Namespace Prefix: | fcbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Performing status returned period. + References No definition available. + Details
Name: | fcbc_PerformingStatusReturnedPeriod
Namespace Prefix: | fcbc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Restructured loans reserves. + References No definition available. + Details
Name: | fcbc_RestructuredLoansReserves
Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fcbc_PurchasedCreditImpairedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=fcbc_WaccamawBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |