XML 51 R40.htm IDEA: XBRL DOCUMENT
v3.23.1

Leases (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2022
Leases [Abstract] |
Classification of ROU Assets and Lease Liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | December 31, 2022 |  | December 31, 2021
Lease Right-of Use Assets | ​ | ​ | ​ | ​ | ​ | ​
Operating lease right-of-use assets | ​ | $ | 1,898 | ​ | $ | 2,247
Lease Liabilities | ​ | ​ | ​ | ​ | ​ | ​
Operating lease liabilities | ​ | $ | 2,373 | ​ | $ | 2,761
​
Weighted-Average Lease Term and Discount Rate for Operating Leases | ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022 | ​ | December 31, 2021
Weighted-average remaining lease term | ​ | ​ | ​ | ​
Operating leases | ​ | 6.17 years | ​ | 6.89 years
Weighted-average discount rate | ​ | ​ | ​ | ​
Operating leases | ​ | 5.00% | ​ | 5.03%
​
Future Minimum Payments for Operating Leases | ​
​ | ​ | ​ | ​
(in thousands) |  | Amount
2023 | ​ | $ | 457
2024 | ​ | ​ | 457
2025 | ​ | ​ | 457
2026 | ​ | ​ | 403
2027 | ​ | ​ | 375
Thereafter | ​ | ​ | 630
Total future minimum lease payments | ​ | ​ | 2,779
Amounts representing interest | ​ | ​ | (406)
Present value of net future minimum lease payments | ​ | $ | 2,373

X
- Definition Lease Right Of Use Assets And Lease Liabilities [Table Text Block] + References No definition available. + Details
Name: | func_LeaseRightOfUseAssetsAndLeaseLiabilitiesTableTextBlock
Namespace Prefix: | func_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted Average Lease Term And Discount Rate Operating Leases [Table Text Block] + References No definition available. + Details
Name: | func_WeightedAverageLeaseTermAndDiscountRateOperatingLeasesTableTextBlock
Namespace Prefix: | func_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration