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Litigation, Commitments and Contingencies - Additional Information (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Commitments and Contingencies Disclosure [Line Items] |  |
Commitments to extend credit | $ 236,471,000 us-gaap_LettersOfCreditOutstandingAmount | $ 216,179,000 us-gaap_LettersOfCreditOutstandingAmount
Trust preferred securities | 15,460,000 fcbc_TrustPreferredSecurities |
FHLB Borrowings |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Commitments to extend credit | $ 6,180,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_FairValueByLiabilityClassAxis = us-gaap_FederalHomeLoanBankBorrowingsMember |

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- Details
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Namespace Prefix: | fcbc_
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- Definition Trust preferred securities. + References No definition available. + Details
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Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |