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Fair Value - Additional Information (Detail) (USD $) | 3 Months Ended
--- | ---
Jun. 30, 2013 | Jun. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Transfers between valuation levels for any assets | $ 0 | $ 0

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- Definition Transfers between valuation levels for any assets. + References No definition available. + Details
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Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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