XML 50 R40.htm IDEA: XBRL DOCUMENT
v3.20.2

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 + References 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 + References 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 + References No definition available. + Details
Name: | func_PaycheckProtectionProgramLoanInterestRate
Namespace Prefix: | func_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Paycheck Protection Program Loan Maturity Term + References 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 + References No definition available. + Details
Name: | func_PaycheckProtectionProgramLoanSbaProcessingFeesPercent
Namespace Prefix: | func_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Paycheck Protection Program Loans Sba Guarantee Percent + References 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 + References No definition available. + Details
Name: | func_PercentageOfProceedsCustomersUseForPayrollCostsToQualifyForSbaLoanForgiveness
Namespace Prefix: | func_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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. + References No definition available. + Details
Name: | us-gaap_UnusualRiskOrUncertaintyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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: |