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Amortized Cost, Fair Value, and Weighted-Average Yield of Securities by Contractual Maturity (Parenthetical) (Detail) | Dec. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |
Fully taxable equivalent at rate | 35.00%fcbc_ComputationOfAverageYieldOfSecuritiesTaxEquivalentBasisRate

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- Definition Computation of Average Yield of Securities, Tax Equivalent Basis Rate + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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