XML 38 R77.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Loans And Related Allowances For Loan Losses (Modification of Troubled Debt Restructuring by Class) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 contract | Dec. 31, 2013 contract
Temporary Rate Modification [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 2 func_NumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember | 4 func_NumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember
Recorded Investment | $ 160 func_RecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember | $ 437 func_RecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember
Temporary Rate Modification [Member] | Commercial Real Estate- Non Owner-Occupied [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember
Recorded Investment | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember
Temporary Rate Modification [Member] | Commercial Real Estate- all Other CRE [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_OtherCommercialRealEstateFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_OtherCommercialRealEstateFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember
Recorded Investment | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_OtherCommercialRealEstateFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_OtherCommercialRealEstateFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember
Temporary Rate Modification [Member] | Acquisition and Development- 1-4 Family Residential construction [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_ResidentialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_ResidentialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember
Recorded Investment | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_ResidentialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_ResidentialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember
Temporary Rate Modification [Member] | Acquisition and Development- All Other A&D [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember
Recorded Investment | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember
Temporary Rate Modification [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember
Recorded Investment | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember
Temporary Rate Modification [Member] | Residential mortgage- Term [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 2 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember | 4 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember
Recorded Investment | 160 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember | 437 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember
Temporary Rate Modification [Member] | Residential Mortgage- Home Equity [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember
Recorded Investment | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember
Temporary Rate Modification [Member] | Consumer [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember
Recorded Investment | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember
Extension of Maturity [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 3 func_NumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 9 func_NumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember
Recorded Investment | 510 func_RecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 1,573 func_RecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember
Extension of Maturity [Member] | Commercial Real Estate- Non Owner-Occupied [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 2 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember
Recorded Investment | 277 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember
Extension of Maturity [Member] | Commercial Real Estate- all Other CRE [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_OtherCommercialRealEstateFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 2 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_OtherCommercialRealEstateFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember
Recorded Investment | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_OtherCommercialRealEstateFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 268 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_OtherCommercialRealEstateFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember
Extension of Maturity [Member] | Acquisition and Development- 1-4 Family Residential construction [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_ResidentialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_ResidentialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember
Recorded Investment | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_ResidentialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_ResidentialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember
Extension of Maturity [Member] | Acquisition and Development- All Other A&D [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember
Recorded Investment | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember
Extension of Maturity [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 5 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember
Recorded Investment | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 669 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember
Extension of Maturity [Member] | Residential mortgage- Term [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 1 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 2 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember
Recorded Investment | 233 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 636 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember
Extension of Maturity [Member] | Residential Mortgage- Home Equity [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember
Recorded Investment | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember
Extension of Maturity [Member] | Consumer [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember
Recorded Investment | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember
Modification of Payment and Other Terms [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 6 func_NumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | 1 func_NumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember
Recorded Investment | 5,199 func_RecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | 1,381 func_RecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember
Modification of Payment and Other Terms [Member] | Commercial Real Estate- Non Owner-Occupied [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember
Recorded Investment | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember
Modification of Payment and Other Terms [Member] | Commercial Real Estate- all Other CRE [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 4 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_OtherCommercialRealEstateFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_OtherCommercialRealEstateFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember
Recorded Investment | 2,627 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_OtherCommercialRealEstateFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_OtherCommercialRealEstateFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember
Modification of Payment and Other Terms [Member] | Acquisition and Development- 1-4 Family Residential construction [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 1 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_ResidentialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_ResidentialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember
Recorded Investment | 790 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_ResidentialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_ResidentialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember
Modification of Payment and Other Terms [Member] | Acquisition and Development- All Other A&D [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 1 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | 1 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember
Recorded Investment | 1,782 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | 1,381 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember
Modification of Payment and Other Terms [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember
Recorded Investment | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember
Modification of Payment and Other Terms [Member] | Residential mortgage- Term [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember
Recorded Investment | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember
Modification of Payment and Other Terms [Member] | Residential Mortgage- Home Equity [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember
Recorded Investment | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember
Modification of Payment and Other Terms [Member] | Consumer [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember
Recorded Investment | $ 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | $ 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings during the period. + References No definition available. + Details
Name: | func_NumberOfContracts
Namespace Prefix: | func_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings during the period. + References No definition available. + Details
Name: | func_RecordedInvestment
Namespace Prefix: | func_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableTroubledDebtRestructuringAxis=func_ExtensionOfMaturityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableTroubledDebtRestructuringAxis=func_ModificationOfPaymentAndOtherTermsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableTroubledDebtRestructuringAxis=func_TemporaryRateModificationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |