XML 110 R97.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Employee Benefit Plans (Narrative) (Details) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2022 USD ($) employee | Jan. 31, 2023 USD ($) | Jan. 31, 2021 USD ($) employee | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Discretionary contribution as percentage of employee's base pay |  |  |  | 15.00% |  |
Defined benefit plan participants compensation expense |  |  |  | $ 1,400,000 | $ 1,300,000 |
Scenario, Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Expected long-term return on pension portfolio assets |  |  |  |  |  | 6.50%
Pension [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Plan modification description |  |  |  | Effective April 30, 2010, the Pension Plan was amended, resulting in a “soft freeze”, the effect of which prohibits new entrants into the Pension Plan and ceases crediting of additional years of service, after that date. Effective January 1, 2013, the Pension Plan was amended to unfreeze it for those employees for whom the sum of (i) their ages, at their closest birthday, plus (ii) years of service for vesting purposes equals 80 or greater. The “soft freeze” continues to apply to all other plan participants. Pension benefits for these participants will be managed through discretionary contributions to the First United Corporation 401(k) Profit Sharing Plan (the “401(k) Plan”). |  |
Defined Benefit Plan, Accumulated Benefit Obligation |  |  |  | $ 38,300,000 | 37,800,000 |
Period for average return on pension portfolio assets |  |  |  | 25 years |  |
Average return on pension portfolio assets |  |  |  | 6.59% |  |
Expected long-term return on pension portfolio assets |  |  |  | 6.50% |  |
Defined benefit plan, contribution by employer |  |  |  | $ 0 | 0 |
SERP [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Vesting period of employer discretionary contribution |  |  | 2 years | 2 years |  |
Defined Benefit Plan, Accumulated Benefit Obligation |  |  |  | $ 8,300,000 | 6,900,000 |
Defined benefit plan, contribution by employer |  |  |  | 336,000 | 336,000 |
SERP [Member] | Three Participants [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Employer discretionary contribution |  | $ 108,184 | $ 101,257 |  |  |
Defined contribution plan, number of employees | employee |  |  | 3 |  |  |
Defined benefit plan participants compensation expense |  |  |  | 54,092 | 50,628 |
SERP [Member] | 2nd Three Participants [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Employer discretionary contribution | $ 103,689 |  |  |  |  |
Defined contribution plan, number of employees | employee | 3 |  |  |  |  |
Defined benefit plan participants compensation expense |  |  |  | $ 51,844 | $ 51,844 |

X
- Definition A percentage calculated as a basis for determining the 25-year average return on pension portfolio assets. + References No definition available. + Details
Name: | func_AverageReturnOnPensionPortfolioAssets
Namespace Prefix: | func_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition A percentage calculated as a basis for determining the expected 25-year average return on pension portfolio assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References No definition available. + Details
Name: | func_ExpectedLongTermReturnOnPensionPortfolioAssets
Namespace Prefix: | func_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Period For Average Return On Pension Portfolio Assets + References No definition available. + Details
Name: | func_PeriodForAverageReturnOnPensionPortfolioAssets
Namespace Prefix: | func_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the vesting period of a discretionary contribution to benefit plan on the part of employer. + References No definition available. + Details
Name: | func_VestingPeriodOfEmployerDiscretionaryContribution
Namespace Prefix: | func_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480794/715-70-50-1 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of employees eligible to participate in defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanNumberOfEmployees
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Description of modification of award under share-based payment arrangement. Includes, but is not limited to, terms for expiration date, vesting rights and exercise price. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationDescriptionAndTerms
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_StatementScenarioAxis=us-gaap_ScenarioPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=func_ThreeParticipantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=func_SecondThreeParticipantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |