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Investments - Available-For-Sale Securities in a Gross Unrealized Loss Position by Length of Time (Details) $ in Thousands | Mar. 31, 2025 USD ($) holding | Dec. 31, 2024 USD ($) holding
--- | --- | ---
Investment grade |  |
Fair value |  |
Less than 12 months | $ 221,033 | $ 280,332
12 months or longer | 243,010 | 260,480
Total | 464,043 | 540,812
Unrealized losses |  |
Less than 12 months | 1,898 | 3,701
12 months or longer | 18,704 | 22,664
Total | $ 20,602 | $ 26,365
No. of holdings | holding | 555 | 616
Non-investment grade |  |
Fair value |  |
Less than 12 months | $ 69,127 | $ 28,972
12 months or longer | 26,899 | 27,561
Total | 96,026 | 56,533
Unrealized losses |  |
Less than 12 months | 1,604 | 702
12 months or longer | 1,892 | 2,080
Total | $ 3,496 | $ 2,782
No. of holdings | holding | 599 | 370
Corporate debt securities |  |
Fair value |  |
Less than 12 months | $ 170,976 | $ 197,619
12 months or longer | 144,217 | 156,059
Total | 315,193 | 353,678
Unrealized losses |  |
Less than 12 months | 2,383 | 2,486
12 months or longer | 4,915 | 6,199
Total | $ 7,298 | $ 8,685
No. of holdings | holding | 754 | 567
Collateralized debt obligations |  |
Fair value |  |
Less than 12 months | $ 64,839 | $ 33,686
12 months or longer | 8,766 | 11,762
Total | 73,605 | 45,448
Unrealized losses |  |
Less than 12 months | 179 | 71
12 months or longer | 214 | 316
Total | $ 393 | $ 387
No. of holdings | holding | 112 | 77
Commercial mortgage-backed securities |  |
Fair value |  |
Less than 12 months | $ 15,244 | $ 28,333
12 months or longer | 22,838 | 24,966
Total | 38,082 | 53,299
Unrealized losses |  |
Less than 12 months | 149 | 407
12 months or longer | 2,097 | 2,578
Total | $ 2,246 | $ 2,985
No. of holdings | holding | 92 | 131
Residential mortgage-backed securities |  |
Fair value |  |
Less than 12 months | $ 31,709 | $ 38,003
12 months or longer | 89,244 | 90,209
Total | 120,953 | 128,212
Unrealized losses |  |
Less than 12 months | 752 | 1,289
12 months or longer | 12,951 | 15,173
Total | $ 13,703 | $ 16,462
No. of holdings | holding | 162 | 169
Other debt securities |  |
Fair value |  |
Less than 12 months | $ 7,392 | $ 11,663
12 months or longer | 4,844 | 5,045
Total | 12,236 | 16,708
Unrealized losses |  |
Less than 12 months | 39 | 150
12 months or longer | 419 | 478
Total | $ 458 | $ 628
No. of holdings | holding | 34 | 42
Available-for-sale securities |  |
Fair value |  |
Less than 12 months | $ 290,160 | $ 309,304
12 months or longer | 269,909 | 288,041
Total | 560,069 | 597,345
Unrealized losses |  |
Less than 12 months | 3,502 | 4,403
12 months or longer | 20,596 | 24,744
Total | $ 24,098 | $ 29,147
No. of holdings | holding | 1,154 | 986

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