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Investments in debt and equity securities - Schedule of Gross Unrealized Gains and Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Gains | $ 3,913 | $ 5,839
Losses | 7,527 | 5,895
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gains | 6 | 5
Losses | 14 | 23
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gains | 833 | 1,646
Losses | 3,337 | 2,596
Foreign |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gains | 2,814 | 3,645
Losses | 3,846 | 3,149
U.S. Treasury Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gains | 260 | 543
Losses | $ 330 | $ 127

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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