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Off-Balance Sheet Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Commitments to extend credit | $ 203,658 us-gaap_LettersOfCreditOutstandingAmount | $ 236,471 us-gaap_LettersOfCreditOutstandingAmount
Commitments related to secondary market mortgage loans | 4,777 fcbc_GrossNotionalAmountsOfOutstandingCommitments | 1,391 fcbc_GrossNotionalAmountsOfOutstandingCommitments
Standby letters of credit and financial guarantees | 3,073 us-gaap_GuarantyLiabilities | 3,581 us-gaap_GuarantyLiabilities
Total off-balance sheet risk | 211,508 us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability | 241,443 us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
Reserve for unfunded commitments | $ 326 fcbc_ReserveForUnfundedCreditCommitments | $ 326 fcbc_ReserveForUnfundedCreditCommitments

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- Definition Gross notional amounts of outstanding commitments. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Reserve for Unfunded Credit Commitments + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
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- Details
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- Definition This item represents a non-contingent liability for the fair value of an obligation to stand ready to perform over the term of a guaranty issued in the event that specified triggering events or conditions occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=7661617&loc=d3e11049-110243 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7661617&loc=d3e11019-110243 + Details
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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
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Period Type: | instant