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Significant Event (Narrative) (Details) - COVID-19 [Member] $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($) state
Significant Event [Line Items]
Number of states with COVID-19 reported cases | state	50
CARES Act [Member]
Significant Event [Line Items]
PPP loans SBA guarantee percent	100.00%
PPP loans interest rate	1.00%
Deferred loan fees receivable from SBA loan processing | $	$ 3.5
CARES Act [Member] | Maximum [Member]
Significant Event [Line Items]
PPP loans maturity term	5 years
PPP loans SBA processing fees, percent	5.00%
CARES Act [Member] | Minimum [Member]
Significant Event [Line Items]
PPP loans maturity term	2 years
Percentage of proceeds customers use for payroll costs to qualify for SBA loan forgiveness	60.00%
PPP loans SBA processing fees, percent	1.00%

X

- Definition

Deferred Loan Fees Receivable From Sba Loan Processing

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No definition available.

+ Details

Name:	func_DeferredLoanFeesReceivableFromSbaLoanProcessing
Namespace Prefix:	func_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Number Of States With Reported Covid Nineteen Cases

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No definition available.

+ Details

Name:	func_NumberOfStatesWithReportedCovidNineteenCases
Namespace Prefix:	func_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Paycheck Protection Program Loan Interest Rate

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No definition available.

+ Details

Name:	func_PaycheckProtectionProgramLoanInterestRate
Namespace Prefix:	func_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- Definition

Paycheck Protection Program Loan Maturity Term

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No definition available.

+ Details

Name:	func_PaycheckProtectionProgramLoanMaturityTerm
Namespace Prefix:	func_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Paycheck Protection Program Loan Sba Processing Fees Percent

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No definition available.

+ Details

Name:	func_PaycheckProtectionProgramLoanSbaProcessingFeesPercent
Namespace Prefix:	func_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- Definition

Paycheck Protection Program Loans Sba Guarantee Percent

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No definition available.

+ Details

Name:	func_PaycheckProtectionProgramLoansSbaGuaranteePercent
Namespace Prefix:	func_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage Of Proceeds Customers Use For Payroll Costs To Qualify For Sba Loan Forgiveness

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No definition available.

+ Details

Name:	func_PercentageOfProceedsCustomersUseForPayrollCostsToQualifyForSbaLoanForgiveness
Namespace Prefix:	func_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

+ Details

Name:	us-gaap_UnusualRiskOrUncertaintyLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	us-gaap_UnusualRiskOrUncertaintyByNatureAxis=func_CovidNineteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=func_CoronavirusAidReliefAndEconomicSecurityActMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: