XML 55 R45.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Loans And Related Allowances For Credit Losses (Narrative) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 USD ($) loan | Mar. 31, 2023 USD ($) loan | Dec. 31, 2023 USD ($)
Financing Receivable, Modifications [Line Items] |  |  |
Allowance for loan losses | $ 17,982 | $ 16,871 | $ 17,480
Non-Accrual | 16,007 |  | 3,956
Threshold commitment amount | $ 100 |  |
Number of loan modifications made to borrowers facing financial difficulties | loan | 0 | 0 |
Partial Charge Off [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Non-Accrual | $ 100 |  | 100
Commercial real estate- non owner-occupied [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Non-Accrual | 219 |  | 227
Commercial real estate- all other CRE [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Non-Accrual | $ 599 |  | $ 599
Acquisition and development- 1-4 family residential construction [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Percentage of loan portfolio accruing loan past due 30 days or more | 0.40% | 0.17% | 0.24%
Financing receivable excluding accrued interest subject to foreclosure | $ 1,800 |  | $ 1,800
Acquisition and development- All other A&D [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Non-Accrual | 105 |  | 113
Commercial and industrial [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Allowance for loan losses | 4,002 | $ 3,755 | 3,717
Non-Accrual | 12,093 |  |
Residential mortgage- term [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Non-Accrual | 2,528 |  | 2,720
Residential mortgage- home equity [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Non-Accrual | 335 |  | 268
Consumer [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Allowance for loan losses | 987 | $ 827 | 929
Non-Accrual | $ 128 |  | $ 29

X
- Definition Number of loan modifications made to borrowers facing financial difficulties. + References No definition available. + Details
Name: | func_FinancingReceivableExcludingAccruedInterestModificationsMadeToBorrowersFacingFinancialDifficultiesNumberOfContracts
Namespace Prefix: | func_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of financing receivable excluding accrued interest subject to foreclosure. + References No definition available. + Details
Name: | func_FinancingReceivableExcludingAccruedInterestSubjectToForeclosure
Namespace Prefix: | func_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of loan portfolio accruing loan past due thirty days or more. + References No definition available. + Details
Name: | func_PercentageOfLoanPortfolioAccruingLoanPastDueThirtyDaysOrMore
Namespace Prefix: | func_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Threshold commitment amount for individually evaluated restructured financing receivable. + References No definition available. + Details
Name: | func_RestructuredFinancingReceivableIndividuallyEvaluatedLoanThresholdCommitment
Namespace Prefix: | func_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable on nonaccrual status. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-16 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-42 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-42 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org//1943274/2147481933/310-10-55-12A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 33 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-33 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-34 + Details
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=func_PartialChargeOffMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

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

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

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