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Other Real Estate Owned (Schedule of Real Estate Properties) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Total OREO $ 12,481us-gaap_RealEstateAcquiredThroughForeclosure $ 12,932us-gaap_RealEstateAcquiredThroughForeclosure
Commercial Real Estate OREO [Member]    
Total OREO 1,956us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember		 1,772us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Acquisition and Development [Member]    
Total OREO 8,722us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= func_CommercialAndResidentialConstructionPortfolioSegmentMember		 9,263us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= func_CommercialAndResidentialConstructionPortfolioSegmentMember
Residential Mortgage [Member]    
Total OREO $ 1,803us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 $ 1,897us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember