XML 41 R62.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Loans and Related Allowance for Loan Losses (Modification of Troubled Debt Restructuring by Class) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 loan | Mar. 31, 2014 loan
Temporary Rate Modification [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 func_NumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember | 1 func_NumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember
Recorded Investment | $ 0 func_RecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember | $ 90 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 | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember | 1 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember
Recorded Investment | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_TemporaryRateModificationMember | 90 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 | 6 func_NumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 2 func_NumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember
Recorded Investment | 4,068 func_RecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 277 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 | 1 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 2 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember
Recorded Investment | 3,097 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 277 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 | 0 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 | 0 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 | 3 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 | 372 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 | 0 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 | 0 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 | 2 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember
Recorded Investment | 599 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ExtensionOfMaturityMember | 0 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 | 7 func_NumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | 1 func_NumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember
Recorded Investment | 4,099 func_RecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | 454 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 | 1 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 | 136 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 | 5 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_OtherCommercialRealEstateFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | 1 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_OtherCommercialRealEstateFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember
Recorded Investment | 3,847 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_OtherCommercialRealEstateFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | 454 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 | 0 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 | 0 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 | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | 0 func_NumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember
Recorded Investment | 0 func_RecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_ModificationOfPaymentAndOtherTermsMember | 0 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 | 1 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 | 116 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: |