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Investments in debt and equity securities - Gross Unrealized Gains and Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Gains | $ 7,378 | $ 3,509
Losses | 7,806 | 16,181
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gains | 5 | 1
Losses | 33 | 149
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gains | 1,766 | 524
Losses | 4,467 | 9,232
Foreign |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gains | 5,100 | 2,979
Losses | 3,104 | 5,607
U.S. Treasury Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gains | 507 | 5
Losses | $ 202 | $ 1,193

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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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