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Investments in debt and equity securities - Schedule of Gross Unrealized Losses on Investments and Fair Values of Related Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Losses |  |
Less than 12 months | $ 1,363 | $ 413
More than 12 months | 6,164 | 5,482
Total | 7,527 | 5,895
Fair values |  |
Less than 12 months | 146,216 | 65,164
More than 12 months | 191,994 | 204,302
Total | 338,210 | 269,466
Municipal |  |
Losses |  |
Less than 12 months | 3 | 4
More than 12 months | 11 | 19
Total | 14 | 23
Fair values |  |
Less than 12 months | 2,432 | 2,621
More than 12 months | 2,499 | 5,918
Total | 4,931 | 8,539
Corporate |  |
Losses |  |
Less than 12 months | 243 | 9
More than 12 months | 3,094 | 2,587
Total | 3,337 | 2,596
Fair values |  |
Less than 12 months | 25,258 | 10,284
More than 12 months | 70,236 | 71,989
Total | 95,494 | 82,273
Foreign |  |
Losses |  |
Less than 12 months | 901 | 364
More than 12 months | 2,945 | 2,785
Total | 3,846 | 3,149
Fair values |  |
Less than 12 months | 89,000 | 43,539
More than 12 months | 113,451 | 119,970
Total | 202,451 | 163,509
U.S. Treasury Bonds |  |
Losses |  |
Less than 12 months | 216 | 36
More than 12 months | 114 | 91
Total | 330 | 127
Fair values |  |
Less than 12 months | 29,526 | 8,720
More than 12 months | 5,808 | 6,425
Total | $ 35,334 | $ 15,145

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