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v2.4.1.9

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 | $ 500,000 func_CommericalAmountBenchmarkMinimumForAnnualReview |  |  |
Commercial amount benchmark minimum for annual review by independent reviewer | 750,000 func_CommericalAmountBenchmarkMinimumForAnnualReviewByIndependentReviewer |  |  |
Commercial amount benchmark minimum criticized relationships for annual review by independent reviewer | 500,000 func_CommercialAmountBenchmarkMinimumCriticizedRelationshipsForAnnualReviewByIndependentReviewer |  |  |
Nonaccrual loans subject to partial charge off | 11,551,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus | 17,396,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus |  |
Financing receivable, modifications, number of contracts | 27 us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 31 us-gaap_FinancingReceivableModificationsNumberOfContracts2 |  |
Reduction of the ALL resulting from new TDRs | 1,822 us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown |  |  |
Financing receivable, modifications, recorded investment | 13,700,000 us-gaap_FinancingReceivableModificationsRecordedInvestment | 17,900,000 us-gaap_FinancingReceivableModificationsRecordedInvestment |  |
Partial Charge Off [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Nonaccrual loans subject to partial charge off | 4,600,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_PartialChargeOffMember | 1,900,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_PartialChargeOffMember |  |
New TDR [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Financing receivable, modifications, number of contracts | 3 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_NewTroubledDebtRestructingLoansMember |  |  |
Pre Existing TDR [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Financing receivable, modifications, number of contracts | 8 us-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 | 3 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_AcquisitionAndDevelopmentTroublDebtRestructingLoansMember |  | 2 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_AcquisitionAndDevelopmentTroublDebtRestructingLoansMember |
Financing receivable, modifications, subsequent default, recorded investment | 1,600,000 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_AcquisitionAndDevelopmentTroublDebtRestructingLoansMember |  | 400,000 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_AcquisitionAndDevelopmentTroublDebtRestructingLoansMember |
Commerical Real Estate TDR [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Financing receivable, modifications, recorded investment | 200,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_CommericalRealEstateTroubledDebtRestructuringLoanMember |  |  |
Commerical and Industrial TDR [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Financing receivable, modifications, recorded investment | 400,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_CommericalAndIndustrialTroubledDebtRestructuringLoanMember |  |  |
Troubled Debt Restructuring [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Unused commitments to extend credit | 10,400 us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TroubledDebtRestructuringMember | 2,000,000 us-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 | 1,152,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember | 681,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember |  |
Financing receivable, modifications, subsequent default, number of contracts |  |  |  | 3 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember
Financing receivable, modifications, subsequent default, recorded investment |  |  |  | 2,200,000 us-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 | 4,610,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_OtherCommercialRealEstateFinancingReceivableMember | 6,752,000 us-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 | 0 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_ResidentialRealEstateConstructionFinancingReceivableMember | 1,104,000 us-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 | 3,609,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember | 4,528,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember |  |
Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Nonaccrual loans subject to partial charge off | 171,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 191,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |  |
Residential mortgage- Term [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Nonaccrual loans subject to partial charge off | 1,666,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember | 3,795,000 us-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 | 343,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember | 331,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember |  |
Consumer [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Nonaccrual loans subject to partial charge off | $ 0 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | $ 14,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |  |

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