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Scheduled Maturities of Certificates of Deposit of $250 Thousand or More (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Time deposit of $250 thousand or more
Three months or less	$ 11,278fcbc_ContractualMaturitiesTimeDeposits250000OrMoreThreeMonthsOrLess
Over three to six months	14,774fcbc_ContractualMaturitiesTimeDeposits250000OrMoreThreeMonthsThroughSixMonths
Over six to twelve months	19,344fcbc_ContractualMaturitiesTimeDeposits250000OrMoreSixMonthsThrough12Months
Over twelve months	14,872fcbc_ContractualMaturitiesTimeDeposits250000OrMoreAfter12Months
Total	$ 60,268fcbc_TimeDeposits250000OrMore	$ 40,820fcbc_TimeDeposits250000OrMore

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Contractual Maturities, Time Deposits, $250,000 or More, after 12 Months

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Contractual Maturities, Time Deposits, $250,000 or More, Six Months Through 12 Months

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Contractual Maturities, Time Deposits, $250,000 or More, Three Months or Less

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Contractual Maturities, Time Deposits, $250,000 or More, Three Months Through Six Months

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Time Deposits, $250,000 or More

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