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Loans And Related Allowances For Loan Losses (Narrative) (Details) (USD $)
12 Months Ended 3 Months Ended
Dec. 31, 2014
loan
Dec. 31, 2013
loan
Jun. 30, 2013
loan
Sep. 30, 2013
loan
Financing Receivable, Modifications [Line Items]        
Commercial amount benchmark minimum for internal annual review $ 500,000func_CommericalAmountBenchmarkMinimumForAnnualReview      
Commercial amount benchmark minimum for annual review by independent reviewer 750,000func_CommericalAmountBenchmarkMinimumForAnnualReviewByIndependentReviewer      
Commercial amount benchmark minimum criticized relationships for annual review by independent reviewer 500,000func_CommercialAmountBenchmarkMinimumCriticizedRelationshipsForAnnualReviewByIndependentReviewer      
Nonaccrual loans subject to partial charge off 11,551,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus 17,396,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus    
Financing receivable, modifications, number of contracts 27us-gaap_FinancingReceivableModificationsNumberOfContracts2 31us-gaap_FinancingReceivableModificationsNumberOfContracts2    
Reduction of the ALL resulting from new TDRs 1,822us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown      
Financing receivable, modifications, recorded investment 13,700,000us-gaap_FinancingReceivableModificationsRecordedInvestment 17,900,000us-gaap_FinancingReceivableModificationsRecordedInvestment    
Partial Charge Off [Member]        
Financing Receivable, Modifications [Line Items]        
Nonaccrual loans subject to partial charge off 4,600,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= func_PartialChargeOffMember
1,900,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= func_PartialChargeOffMember
   
New TDR [Member]        
Financing Receivable, Modifications [Line Items]        
Financing receivable, modifications, number of contracts 3us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= func_NewTroubledDebtRestructingLoansMember
     
Pre Existing TDR [Member]        
Financing Receivable, Modifications [Line Items]        
Financing receivable, modifications, number of contracts 8us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= func_PreExistingTroubledDebtRestructingLoansMember
     
Acquisition and Development (A&D) TDR [Member]        
Financing Receivable, Modifications [Line Items]        
Financing receivable, modifications, subsequent default, number of contracts 3us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= func_AcquisitionAndDevelopmentTroublDebtRestructingLoansMember
  2us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= func_AcquisitionAndDevelopmentTroublDebtRestructingLoansMember
 
Financing receivable, modifications, subsequent default, recorded investment 1,600,000us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= func_AcquisitionAndDevelopmentTroublDebtRestructingLoansMember
  400,000us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= func_AcquisitionAndDevelopmentTroublDebtRestructingLoansMember
 
Commerical Real Estate TDR [Member]        
Financing Receivable, Modifications [Line Items]        
Financing receivable, modifications, recorded investment 200,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= func_CommericalRealEstateTroubledDebtRestructuringLoanMember
     
Commerical and Industrial TDR [Member]        
Financing Receivable, Modifications [Line Items]        
Financing receivable, modifications, recorded investment 400,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= func_CommericalAndIndustrialTroubledDebtRestructuringLoanMember
     
Troubled Debt Restructuring [Member]        
Financing Receivable, Modifications [Line Items]        
Unused commitments to extend credit 10,400us-gaap_UnusedCommitmentsToExtendCredit
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= func_TroubledDebtRestructuringMember
2,000,000us-gaap_UnusedCommitmentsToExtendCredit
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= func_TroubledDebtRestructuringMember
   
Commercial Real Estate- Non Owner-Occupied [Member]        
Financing Receivable, Modifications [Line Items]        
Nonaccrual loans subject to partial charge off 1,152,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember
681,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember
   
Financing receivable, modifications, subsequent default, number of contracts       3us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember
Financing receivable, modifications, subsequent default, recorded investment       2,200,000us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember
Commercial Real Estate- all Other CRE [Member]        
Financing Receivable, Modifications [Line Items]        
Nonaccrual loans subject to partial charge off 4,610,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= func_OtherCommercialRealEstateFinancingReceivableMember
6,752,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= func_OtherCommercialRealEstateFinancingReceivableMember
   
Acquisition and Development- 1-4 Family Residential construction [Member]        
Financing Receivable, Modifications [Line Items]        
Nonaccrual loans subject to partial charge off 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= func_ResidentialRealEstateConstructionFinancingReceivableMember
1,104,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= func_ResidentialRealEstateConstructionFinancingReceivableMember
   
Acquisition and Development- All Other A&D [Member]        
Financing Receivable, Modifications [Line Items]        
Nonaccrual loans subject to partial charge off 3,609,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
4,528,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
   
Commercial and Industrial [Member]        
Financing Receivable, Modifications [Line Items]        
Nonaccrual loans subject to partial charge off 171,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
191,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
Residential mortgage- Term [Member]        
Financing Receivable, Modifications [Line Items]        
Nonaccrual loans subject to partial charge off 1,666,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
3,795,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
   
Residential Mortgage- Home Equity [Member]        
Financing Receivable, Modifications [Line Items]        
Nonaccrual loans subject to partial charge off 343,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
331,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
   
Consumer [Member]        
Financing Receivable, Modifications [Line Items]        
Nonaccrual loans subject to partial charge off $ 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
$ 14,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember