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Loans and Related Allowance for Loan Losses (Narrative) (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
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 | 1,000,000 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 | 10,031,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus |  | 11,551,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Reduction of the ALL resulting from new TDRs |  | 1,055 us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown |
Loans in process of foreclosure | 1,600,000 func_MortgageLoansInProcessOfForeclosureAmount |  | 1,900,000 func_MortgageLoansInProcessOfForeclosureAmount
Partial Charge Off [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Nonaccrual loans subject to partial charge off | 5,400,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_PartialChargeOffMember |  | 4,600,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_PartialChargeOffMember
New TDR [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Financing receivable, modifications, number of contracts | 5 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_NewTroubledDebtRestructingLoansMember | 2 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_NewTroubledDebtRestructingLoansMember |
Pre Existing TDR [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Financing receivable, modifications, number of contracts |  | 2 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_PreExistingTroubledDebtRestructingLoansMember |
Acquisition and Development (A&D) TDR [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Financing receivable, modifications, number of contracts |  | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_AcquisitionAndDevelopmentTroublDebtRestructingLoansMember |
Financing receivable, modifications, subsequent default, recorded investment |  | 1,400,000 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_AcquisitionAndDevelopmentTroublDebtRestructingLoansMember |
Commercial real estate- non owner-occupied [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Nonaccrual loans subject to partial charge off | $ 488,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember |  | $ 1,152,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember

X
- Definition Commercial amount benchmark minimum criticized relationships for annual review by independent reviewer. + References No definition available. + Details
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Namespace Prefix: | func_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Commerical amount benchmark minimum for internal annual review. + References No definition available. + Details
Name: | func_CommericalAmountBenchmarkMinimumForAnnualReview
Namespace Prefix: | func_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Commerical amount benchmark minimum for annual review by independent reviewer. + References No definition available. + Details
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Namespace Prefix: | func_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process. + References No definition available. + Details
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Namespace Prefix: | func_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Period Type: | duration

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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Period Type: | duration

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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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