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Derivative Financial Instruments (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jun. 17, 2014
Jun. 15, 2012
Derivative [Line Items]        
Interest rate swap notional amount $ 5,000,000invest_DerivativeNotionalAmount      
Interest rate swap fair value (199,000)us-gaap_DerivativeAssetFairValueGrossLiability (457,000)us-gaap_DerivativeAssetFairValueGrossLiability    
Cash collateral 850,000us-gaap_CashCollateralForBorrowedSecurities 1,400,000us-gaap_CashCollateralForBorrowedSecurities    
Gain on derivative 258,000us-gaap_DerivativeGainOnDerivative      
Deferred tax asset on gain on derivative 103,000us-gaap_DeferredTaxAssetsDerivativeInstruments      
Cash flow hedge ineffectiveness Interest rate swap agreements are entered into with counterparties that meet established credit standards and we believe that the credit risk inherent in these contracts is not significant as of December 31, 2014.      
Interest Rate Swap [Member]        
Derivative [Line Items]        
Interest rate swap notional amount 20,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		      
Number of interest rate swap contracts 3func_NumberOfInterestRateSwapContracts
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		      
Derivative Matured [Member]        
Derivative [Line Items]        
Interest rate swap notional amount     10,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= func_DerivativeMaturedMember		 5,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= func_DerivativeMaturedMember
Swap Contract- 7 year $5 Million [Member]        
Derivative [Line Items]        
Interest rate swap notional amount $ 5,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= func_SwapContract7Year5MillionMember		      
Derivative, maturity date Jun. 17, 2016