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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	$ 500,000func_CommericalAmountBenchmarkMinimumForAnnualReview
Commercial amount benchmark minimum for annual review by independent reviewer	1,000,000func_CommericalAmountBenchmarkMinimumForAnnualReviewByIndependentReviewer
Commercial amount benchmark minimum criticized relationships for annual review by independent reviewer	500,000func_CommercialAmountBenchmarkMinimumCriticizedRelationshipsForAnnualReviewByIndependentReviewer
Nonaccrual loans subject to partial charge off	10,031,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus		11,551,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Reduction of the ALL resulting from new TDRs		1,055us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
Loans in process of foreclosure	1,600,000func_MortgageLoansInProcessOfForeclosureAmount		1,900,000func_MortgageLoansInProcessOfForeclosureAmount
Partial Charge Off [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans subject to partial charge off	5,400,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_PartialChargeOffMember		4,600,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_PartialChargeOffMember
New TDR [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts	5us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_NewTroubledDebtRestructingLoansMember	2us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_NewTroubledDebtRestructingLoansMember
Pre Existing TDR [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts		2us-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		1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_AcquisitionAndDevelopmentTroublDebtRestructingLoansMember
Financing receivable, modifications, subsequent default, recorded investment		1,400,000us-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	$ 488,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialRealEstateNonOwnerOccupiedFinancingReceivableMember		$ 1,152,000us-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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X

- Definition

Commerical amount benchmark minimum for internal annual review.

+ References

No definition available.

+ Details

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Namespace Prefix:	func_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- 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
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X

- 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

Name:	func_MortgageLoansInProcessOfForeclosureAmount
Namespace Prefix:	func_
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- Details

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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

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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

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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

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X

- 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

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- Details

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