XML 51 R41.htm IDEA: XBRL DOCUMENT
v3.20.2

Significant Event (Data on Consumer and Commercial Loan Portfolios by Industry and Percentage of Portfolio Modified) (Details) $ in Thousands |  |  | 9 Months Ended
--- | --- | --- | ---
Oct. 30, 2020 USD ($) contract | Jul. 31, 2020 USD ($) contract | Sep. 30, 2020 USD ($) contract
Number of Loans | contract |  |  | 10,468
Loans Balance | $ |  |  | $ 1,043,490
Commercial Loan [Member] |  |  |
Number of Loans | contract |  |  | 1,803
Loans Balance | $ |  |  | $ 607,214
Commercial Loan [Member] | RE/Rental/Leasing - Non-Owner Occupied [Member] |  |  |
Number of Loans | contract |  |  | 90
Loans Balance | $ |  |  | $ 124,370
Commercial Loan [Member] | RE/Rental/Leasing - All Other [Member] |  |  |
Number of Loans | contract |  |  | 320
Loans Balance | $ |  |  | $ 100,358
Commercial Loan [Member] | Construction - Developers [Member] |  |  |
Number of Loans | contract |  |  | 20
Loans Balance | $ |  |  | $ 57,977
Commercial Loan [Member] | Accommodations [Member] |  |  |
Number of Loans | contract |  |  | 33
Loans Balance | $ |  |  | $ 47,857
Commercial Loan [Member] | Services [Member] |  |  |
Number of Loans | contract |  |  | 207
Loans Balance | $ |  |  | $ 45,926
Commercial Loan [Member] | Health Care/Social Assistance [Member] |  |  |
Number of Loans | contract |  |  | 60
Loans Balance | $ |  |  | $ 34,048
Commercial Loan [Member] | RE/Rental/Leasing - Multifamily [Member] |  |  |
Number of Loans | contract |  |  | 107
Loans Balance | $ |  |  | $ 32,204
Commercial Loan [Member] | RE/Rental/Leasing - Developers [Member] |  |  |
Number of Loans | contract |  |  | 39
Loans Balance | $ |  |  | $ 25,840
Commercial Loan [Member] | Manufacturing [Member] |  |  |
Number of Loans | contract |  |  | 50
Loans Balance | $ |  |  | $ 25,519
Commercial Loan [Member] | Construction - All Other [Member] |  |  |
Number of Loans | contract |  |  | 268
Loans Balance | $ |  |  | $ 24,199
Commercial Loan [Member] | Prof/Scientific/Technical [Member] |  |  |
Number of Loans | contract |  |  | 108
Loans Balance | $ |  |  | $ 19,820
Commercial Loan [Member] | Trade [Member] |  |  |
Number of Loans | contract |  |  | 109
Loans Balance | $ |  |  | $ 16,890
Commercial Loan [Member] | Transportation/Warehousing [Member] |  |  |
Number of Loans | contract |  |  | 226
Loans Balance | $ |  |  | $ 15,979
Commercial Loan [Member] | Food Service [Member] |  |  |
Number of Loans | contract |  |  | 32
Loans Balance | $ |  |  | $ 11,110
Commercial Loan [Member] | Public Administration [Member] |  |  |
Number of Loans | contract |  |  | 46
Loans Balance | $ |  |  | $ 10,536
Commercial Loan [Member] | Entertainment Recreation [Member] |  |  |
Number of Loans | contract |  |  | 24
Loans Balance | $ |  |  | $ 8,341
Commercial Loan [Member] | Agriculture [Member] |  |  |
Number of Loans | contract |  |  | 52
Loans Balance | $ |  |  | $ 4,595
Commercial Loan [Member] | Energy [Member] |  |  |
Number of Loans | contract |  |  | 12
Loans Balance | $ |  |  | $ 1,645
Residential Mortgage [Member] |  |  |
Number of Loans | contract |  |  | 2,157
Loans Balance | $ |  |  | $ 334,185
Consumer [Member] |  |  |
Number of Loans | contract |  |  | 6,508
Loans Balance | $ |  |  | $ 102,091
Loan Portfolios [Member] | Credit Concentration Risk [Member] |  |  |
Balance as % of Total Portfolio |  |  | 100.00%
Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] |  |  |
Balance as % of Total Portfolio |  |  | 58.20%
Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | RE/Rental/Leasing - Non-Owner Occupied [Member] |  |  |
Balance as % of Total Portfolio |  |  | 11.90%
Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | RE/Rental/Leasing - All Other [Member] |  |  |
Balance as % of Total Portfolio |  |  | 9.60%
Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Construction - Developers [Member] |  |  |
Balance as % of Total Portfolio |  |  | 5.60%
Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Accommodations [Member] |  |  |
Balance as % of Total Portfolio |  |  | 4.60%
Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Services [Member] |  |  |
Balance as % of Total Portfolio |  |  | 4.40%
Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Health Care/Social Assistance [Member] |  |  |
Balance as % of Total Portfolio |  |  | 3.30%
Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | RE/Rental/Leasing - Multifamily [Member] |  |  |
Balance as % of Total Portfolio |  |  | 3.10%
Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | RE/Rental/Leasing - Developers [Member] |  |  |
Balance as % of Total Portfolio |  |  | 2.50%
Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Manufacturing [Member] |  |  |
Balance as % of Total Portfolio |  |  | 2.40%
Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Construction - All Other [Member] |  |  |
Balance as % of Total Portfolio |  |  | 2.30%
Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Prof/Scientific/Technical [Member] |  |  |
Balance as % of Total Portfolio |  |  | 1.90%
Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Trade [Member] |  |  |
Balance as % of Total Portfolio |  |  | 1.60%
Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Transportation/Warehousing [Member] |  |  |
Balance as % of Total Portfolio |  |  | 1.50%
Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Food Service [Member] |  |  |
Balance as % of Total Portfolio |  |  | 1.10%
Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Public Administration [Member] |  |  |
Balance as % of Total Portfolio |  |  | 1.00%
Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Entertainment Recreation [Member] |  |  |
Balance as % of Total Portfolio |  |  | 0.80%
Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Agriculture [Member] |  |  |
Balance as % of Total Portfolio |  |  | 0.40%
Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Energy [Member] |  |  |
Balance as % of Total Portfolio |  |  | 0.20%
Loan Portfolios [Member] | Credit Concentration Risk [Member] | Residential Mortgage [Member] |  |  |
Balance as % of Total Portfolio |  |  | 32.00%
Loan Portfolios [Member] | Credit Concentration Risk [Member] | Consumer [Member] |  |  |
Balance as % of Total Portfolio |  |  | 9.80%
COVID-19 [Member] |  |  |
Number of Loans | contract |  | 383 |
Loans Balance | $ |  | $ 214,453 |
Number of PPP loans | contract |  |  | 1,174
PPP loans | $ |  |  | $ 148,900
PPP loans, percent |  |  | 1.60%
COVID-19 [Member] | Subsequent Event [Member] |  |  |
Number of Loans | contract | 42 |  |
Loans Balance | $ | $ 19,251 |  |
COVID-19 [Member] | Commercial Loan [Member] |  |  |
Number of Loans | contract |  | 230 |
Loans Balance | $ |  | $ 184,920 |
COVID-19 [Member] | Commercial Loan [Member] | Subsequent Event [Member] |  |  |
Number of Loans | contract | 14 |  |
Loans Balance | $ | $ 14,340 |  |
COVID-19 [Member] | Commercial Loan [Member] | RE/Rental/Leasing - Non-Owner Occupied [Member] |  |  |
Number of Loans | contract |  | 25 |
Loans Balance | $ |  | $ 53,664 |
COVID-19 [Member] | Commercial Loan [Member] | RE/Rental/Leasing - All Other [Member] |  |  |
Number of Loans | contract |  | 43 |
Loans Balance | $ |  | $ 23,562 |
COVID-19 [Member] | Commercial Loan [Member] | RE/Rental/Leasing - All Other [Member] | Subsequent Event [Member] |  |  |
Number of Loans | contract | 2 |  |
Loans Balance | $ | $ 141 |  |
COVID-19 [Member] | Commercial Loan [Member] | Construction - Developers [Member] |  |  |
Number of Loans | contract |  | 1 |
Loans Balance | $ |  | $ 2,975 |
COVID-19 [Member] | Commercial Loan [Member] | Accommodations [Member] |  |  |
Number of Loans | contract |  | 12 |
Loans Balance | $ |  | $ 33,246 |
COVID-19 [Member] | Commercial Loan [Member] | Accommodations [Member] | Subsequent Event [Member] |  |  |
Number of Loans | contract | 6 |  |
Loans Balance | $ | $ 13,519 |  |
COVID-19 [Member] | Commercial Loan [Member] | Services [Member] |  |  |
Number of Loans | contract |  | 26 |
Loans Balance | $ |  | $ 15,539 |
COVID-19 [Member] | Commercial Loan [Member] | Health Care/Social Assistance [Member] |  |  |
Number of Loans | contract |  | 16 |
Loans Balance | $ |  | $ 8,564 |
COVID-19 [Member] | Commercial Loan [Member] | RE/Rental/Leasing - Multifamily [Member] |  |  |
Number of Loans | contract |  | 24 |
Loans Balance | $ |  | $ 11,447 |
COVID-19 [Member] | Commercial Loan [Member] | RE/Rental/Leasing - Developers [Member] |  |  |
Number of Loans | contract |  | 3 |
Loans Balance | $ |  | $ 6,773 |
COVID-19 [Member] | Commercial Loan [Member] | Manufacturing [Member] |  |  |
Number of Loans | contract |  | 7 |
Loans Balance | $ |  | $ 10,710 |
COVID-19 [Member] | Commercial Loan [Member] | Construction - All Other [Member] |  |  |
Number of Loans | contract |  | 19 |
Loans Balance | $ |  | $ 3,142 |
COVID-19 [Member] | Commercial Loan [Member] | Construction - All Other [Member] | Subsequent Event [Member] |  |  |
Number of Loans | contract | 5 |  |
Loans Balance | $ | $ 396 |  |
COVID-19 [Member] | Commercial Loan [Member] | Prof/Scientific/Technical [Member] |  |  |
Number of Loans | contract |  | 25 |
Loans Balance | $ |  | $ 7,521 |
COVID-19 [Member] | Commercial Loan [Member] | Trade [Member] |  |  |
Number of Loans | contract |  | 5 |
Loans Balance | $ |  | $ 1,405 |
COVID-19 [Member] | Commercial Loan [Member] | Transportation/Warehousing [Member] |  |  |
Number of Loans | contract |  | 5 |
Loans Balance | $ |  | $ 235 |
COVID-19 [Member] | Commercial Loan [Member] | Public Administration [Member] |  |  |
Number of Loans | contract |  | 11 |
Loans Balance | $ |  | $ 3,003 |
COVID-19 [Member] | Commercial Loan [Member] | Entertainment Recreation [Member] |  |  |
Number of Loans | contract |  | 6 |
Loans Balance | $ |  | $ 2,626 |
COVID-19 [Member] | Commercial Loan [Member] | Entertainment Recreation [Member] | Subsequent Event [Member] |  |  |
Number of Loans | contract | 1 |  |
Loans Balance | $ | $ 284 |  |
COVID-19 [Member] | Commercial Loan [Member] | Agriculture [Member] |  |  |
Number of Loans | contract |  | 2 |
Loans Balance | $ |  | $ 508 |
COVID-19 [Member] | Residential Mortgage [Member] |  |  |
Number of Loans | contract |  | 93 |
Loans Balance | $ |  | $ 26,089 |
COVID-19 [Member] | Residential Mortgage [Member] | Subsequent Event [Member] |  |  |
Number of Loans | contract | 16 |  |
Loans Balance | $ | $ 4,508 |  |
COVID-19 [Member] | Consumer [Member] |  |  |
Number of Loans | contract |  | 60 |
Loans Balance | $ |  | $ 3,444 |
COVID-19 [Member] | Consumer [Member] | Subsequent Event [Member] |  |  |
Number of Loans | contract | 12 |  |
Loans Balance | $ | $ 403 |  |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] |  |  |
Balance as % of Total Portfolio |  | 20.60% |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Subsequent Event [Member] |  |  |
Balance as % of Total Portfolio | 1.80% |  |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] |  |  |
Balance as % of Total Portfolio |  | 31.10% |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Subsequent Event [Member] |  |  |
Balance as % of Total Portfolio | 2.40% |  |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | RE/Rental/Leasing - Non-Owner Occupied [Member] |  |  |
Balance as % of Total Portfolio |  | 44.40% |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | RE/Rental/Leasing - Non-Owner Occupied [Member] | Subsequent Event [Member] |  |  |
Balance as % of Total Portfolio | 0.00% |  |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | RE/Rental/Leasing - All Other [Member] |  |  |
Balance as % of Total Portfolio |  | 25.20% |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | RE/Rental/Leasing - All Other [Member] | Subsequent Event [Member] |  |  |
Balance as % of Total Portfolio | 0.10% |  |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Construction - Developers [Member] |  |  |
Balance as % of Total Portfolio |  | 5.20% |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Construction - Developers [Member] | Subsequent Event [Member] |  |  |
Balance as % of Total Portfolio | 0.00% |  |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Accommodations [Member] |  |  |
Balance as % of Total Portfolio |  | 70.00% |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Accommodations [Member] | Subsequent Event [Member] |  |  |
Balance as % of Total Portfolio | 28.20% |  |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Services [Member] |  |  |
Balance as % of Total Portfolio |  | 34.90% |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Services [Member] | Subsequent Event [Member] |  |  |
Balance as % of Total Portfolio | 0.00% |  |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Health Care/Social Assistance [Member] |  |  |
Balance as % of Total Portfolio |  | 25.90% |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Health Care/Social Assistance [Member] | Subsequent Event [Member] |  |  |
Balance as % of Total Portfolio | 0.00% |  |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | RE/Rental/Leasing - Multifamily [Member] |  |  |
Balance as % of Total Portfolio |  | 36.90% |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | RE/Rental/Leasing - Multifamily [Member] | Subsequent Event [Member] |  |  |
Balance as % of Total Portfolio | 0.00% |  |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | RE/Rental/Leasing - Developers [Member] |  |  |
Balance as % of Total Portfolio |  | 23.30% |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | RE/Rental/Leasing - Developers [Member] | Subsequent Event [Member] |  |  |
Balance as % of Total Portfolio | 0.00% |  |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Manufacturing [Member] |  |  |
Balance as % of Total Portfolio |  | 41.60% |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Manufacturing [Member] | Subsequent Event [Member] |  |  |
Balance as % of Total Portfolio | 0.00% |  |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Construction - All Other [Member] |  |  |
Balance as % of Total Portfolio |  | 12.20% |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Construction - All Other [Member] | Subsequent Event [Member] |  |  |
Balance as % of Total Portfolio | 1.60% |  |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Prof/Scientific/Technical [Member] |  |  |
Balance as % of Total Portfolio |  | 34.10% |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Prof/Scientific/Technical [Member] | Subsequent Event [Member] |  |  |
Balance as % of Total Portfolio | 0.00% |  |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Trade [Member] |  |  |
Balance as % of Total Portfolio |  | 9.10% |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Trade [Member] | Subsequent Event [Member] |  |  |
Balance as % of Total Portfolio | 0.00% |  |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Transportation/Warehousing [Member] |  |  |
Balance as % of Total Portfolio |  | 1.60% |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Transportation/Warehousing [Member] | Subsequent Event [Member] |  |  |
Balance as % of Total Portfolio | 0.00% |  |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Food Service [Member] |  |  |
Balance as % of Total Portfolio |  | 0.00% |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Food Service [Member] | Subsequent Event [Member] |  |  |
Balance as % of Total Portfolio | 0.00% |  |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Public Administration [Member] |  |  |
Balance as % of Total Portfolio |  | 31.60% |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Public Administration [Member] | Subsequent Event [Member] |  |  |
Balance as % of Total Portfolio | 1.90% |  |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Entertainment Recreation [Member] |  |  |
Balance as % of Total Portfolio |  | 36.30% |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Entertainment Recreation [Member] | Subsequent Event [Member] |  |  |
Balance as % of Total Portfolio | 3.40% |  |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Agriculture [Member] |  |  |
Balance as % of Total Portfolio |  | 11.00% |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Agriculture [Member] | Subsequent Event [Member] |  |  |
Balance as % of Total Portfolio | 0.00% |  |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Energy [Member] |  |  |
Balance as % of Total Portfolio |  | 0.00% |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Commercial Loan [Member] | Energy [Member] | Subsequent Event [Member] |  |  |
Balance as % of Total Portfolio | 0.00% |  |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Residential Mortgage [Member] |  |  |
Balance as % of Total Portfolio |  | 7.60% |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Residential Mortgage [Member] | Subsequent Event [Member] |  |  |
Balance as % of Total Portfolio | 1.20% |  |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Consumer [Member] |  |  |
Balance as % of Total Portfolio |  | 3.30% |
COVID-19 [Member] | Loan Portfolios [Member] | Credit Concentration Risk [Member] | Consumer [Member] | Subsequent Event [Member] |  |  |
Balance as % of Total Portfolio | 0.50% |  |

X
- Definition Number Of Paycheck Protection Program Loan Applications Approved + References No definition available. + Details
Name: | func_NumberOfPaycheckProtectionProgramLoanApplicationsApproved
Namespace Prefix: | func_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Paycheck Protection Program Loan Amount + References No definition available. + Details
Name: | func_PaycheckProtectionProgramLoanAmount
Namespace Prefix: | func_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13531-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
Name: | us-gaap_ConcentrationRiskPercentage1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=func_RerentalLeasingNonOwnerOccupiedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=func_RerentalLeasingAllOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=func_ConstructionDevelopersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=func_AccommodationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=func_ServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=func_HealthCareOrSocialAssistanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=func_ReRentalLeasingMultifamilyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=func_ReRentalLeasingDevelopersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=func_ManufacturingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=func_ConstructionAllOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=func_ProfScientificTechnicalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=func_TradeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=func_TransportationWarehousingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=func_FoodServiceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=func_PublicAdministrationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=func_EntertainmentRecreationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=func_AgricultureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=func_EnergyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=func_LoanPortfoliosMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CreditConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |