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Credit Quality - Additional information (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 08, 2012
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Minimum commercial loan relationships to be reviewed by loan review function | $ 4,000,000 fcbc_CommercialLoans |  |  |
Restructured loans to borrowers experiencing financial difficulty in excess of | 250,000 fcbc_RestructuredLoansReserves |  |  |
Performing status returned period | 6 months |  |  |
Allowance for loan losses | 475,000 fcbc_AllowanceForLoanLosses | 1,840,000 fcbc_AllowanceForLoanLosses |  |
Interest income recognized on loan restructurings | 597,000 fcbc_InterestIncomeRecognizedOnLoanRestructurings | 551,000 fcbc_InterestIncomeRecognizedOnLoanRestructurings | 640,000 fcbc_InterestIncomeRecognizedOnLoanRestructurings |
Covered Loans |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Accruing loans contractually past due 90 days or more | $ 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember | $ 86,000 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember |  |
Waccamaw Bank |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Percentage of loan and foreclosed real estate losses covered by FDIC | 80.00%fcbc_PercentageOfLossCoveredByFdic / us-gaap_BusinessAcquisitionAxis = fcbc_WaccamawBankMember |  |  | 80.00%fcbc_PercentageOfLossCoveredByFdic / us-gaap_BusinessAcquisitionAxis = fcbc_WaccamawBankMember
PCI loans |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Number of impaired loans | 2 fcbc_LoansAndLeasesReceivableImpairedNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember | 4 fcbc_LoansAndLeasesReceivableImpairedNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember |  |
Number of loans | 7 fcbc_FinancingReceivableNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember |  |  |

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- 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

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- 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

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- 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 Interest income recognized on loan restructurings. + References No definition available. + Details
Name: | fcbc_InterestIncomeRecognizedOnLoanRestructurings
Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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

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- 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

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- 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

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- 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

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- Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | fcbc_ScheduleOfFinancingReceivableAgingAxis=fcbc_CoveredLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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