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Other Real Estate Owned (Schedule of Real Estate Properties) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Total OREO | $ 12,932 us-gaap_RealEstateAcquiredThroughForeclosure | $ 17,031 us-gaap_RealEstateAcquiredThroughForeclosure
Commercial Real Estate [Member] |  |
Total OREO | 1,772 us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember | 5,306 us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember
Acquisition and Development [Member] |  |
Total OREO | 9,263 us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialAndResidentialConstructionPortfolioSegmentMember | 10,509 us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialAndResidentialConstructionPortfolioSegmentMember
Residential Mortgage [Member] |  |
Total OREO | $ 1,897 us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | $ 1,216 us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember

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- Definition Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4437-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 + Details
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