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Components of Other Operating Income (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Component of Operating Other Cost and Expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Miscellaneous income |  |  |  |  |  |  |  |  | $ 429 us-gaap_OtherIncome |  | $ 411 us-gaap_OtherIncome |  | $ 2,459 us-gaap_OtherIncome |
Other |  |  |  |  |  |  |  |  | 3,926 fcbc_OtherMiscellaneousIncome | [1] | 4,824 fcbc_OtherMiscellaneousIncome | [1] | 4,283 fcbc_OtherMiscellaneousIncome | [1]
Total other operating income | $ 9,189 us-gaap_OtherOperatingIncome | $ 7,347 us-gaap_OtherOperatingIncome | $ 7,663 us-gaap_OtherOperatingIncome | $ 7,189 us-gaap_OtherOperatingIncome | $ 6,743 us-gaap_OtherOperatingIncome | $ 8,150 us-gaap_OtherOperatingIncome | $ 6,735 us-gaap_OtherOperatingIncome | $ 7,744 us-gaap_OtherOperatingIncome | $ 4,355 us-gaap_OtherOperatingIncome |  | $ 5,235 us-gaap_OtherOperatingIncome |  | $ 6,742 us-gaap_OtherOperatingIncome |
[1] | Other components of other operating income that do not exceed 1% of total income.

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- Definition Other Miscellaneous Income + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Details
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Data Type: | xbrli:stringItemType
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- Definition Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.4) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 4 -Article 7 + Details
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- Definition The total amount of other operating income, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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