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Investments in debt and equity securities - Gross Unrealized Losses on Investments and Fair Values of Related Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Losses |  |
Less than 12 months | $ 549 | $ 1,453
More than 12 months | 11,172 | 14,728
Total | 11,721 | 16,181
Fair values |  |
Less than 12 months | 49,357 | 90,810
More than 12 months | 314,823 | 334,047
Total | 364,180 | 424,857
Municipal |  |
Losses |  |
Less than 12 months | 21 | 32
More than 12 months | 88 | 117
Total | 109 | 149
Fair values |  |
Less than 12 months | 3,569 | 5,204
More than 12 months | 7,447 | 7,960
Total | 11,016 | 13,164
Corporate |  |
Losses |  |
Less than 12 months | 35 | 194
More than 12 months | 7,130 | 9,038
Total | 7,165 | 9,232
Fair values |  |
Less than 12 months | 7,633 | 19,253
More than 12 months | 158,357 | 168,289
Total | 165,990 | 187,542
Foreign |  |
Losses |  |
Less than 12 months | 212 | 349
More than 12 months | 3,762 | 5,258
Total | 3,974 | 5,607
Fair values |  |
Less than 12 months | 13,707 | 32,664
More than 12 months | 138,329 | 145,656
Total | 152,036 | 178,320
U.S. Treasury Bonds |  |
Losses |  |
Less than 12 months | 281 | 878
More than 12 months | 192 | 315
Total | 473 | 1,193
Fair values |  |
Less than 12 months | 24,448 | 33,689
More than 12 months | 10,690 | 12,142
Total | $ 35,138 | $ 45,831

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