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Investments - Schedule of Realized Gain and Loss and Investments in Unrealized Loss Position (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract] |  |  |
Realized gross gains | $ 495 | $ 1,219 | $ 14,420
Realized gross losses | 2,322 | 8,246 | 14,864
Impairment loss | 523 | 177 | $ 12,728
Fair Value |  |  |
Less than 12 months | 1,954,295 | 550,525 |
12 months or more | 2,567,865 | 3,200,767 |
Total | 4,522,160 | 3,751,292 |
Gross Unrealized Losses |  |  |
Less than 12 months | (50,014) | (5,759) |
12 months or more | (308,438) | (330,678) |
Total | (358,452) | (336,437) |
U.S. Treasury securities |  |  |
Fair Value |  |  |
Less than 12 months | 141,789 | 139,398 |
12 months or more | 279,143 | 355,921 |
Total | 420,932 | 495,319 |
Gross Unrealized Losses |  |  |
Less than 12 months | (1,620) | (1,075) |
12 months or more | (13,268) | (18,053) |
Total | (14,888) | (19,128) |
U.S. agency securities |  |  |
Fair Value |  |  |
Less than 12 months |  | 5,572 |
12 months or more |  | 1,623 |
Total |  | 7,195 |
Gross Unrealized Losses |  |  |
Less than 12 months |  | (2) |
12 months or more |  | (2) |
Total |  | (4) |
U.S. agency mortgage-backed securities |  |  |
Fair Value |  |  |
Less than 12 months | 476,695 | 129,359 |
12 months or more | 629,036 | 654,018 |
Total | 1,105,731 | 783,377 |
Gross Unrealized Losses |  |  |
Less than 12 months | (13,028) | (1,616) |
12 months or more | (110,837) | (100,383) |
Total | (123,865) | (101,999) |
Municipal debt securities |  |  |
Fair Value |  |  |
Less than 12 months | 204,810 | 59,301 |
12 months or more | 282,312 | 297,039 |
Total | 487,122 | 356,340 |
Gross Unrealized Losses |  |  |
Less than 12 months | (5,688) | (987) |
12 months or more | (43,422) | (43,462) |
Total | (49,110) | (44,449) |
Non-U.S. government securities |  |  |
Fair Value |  |  |
Less than 12 months | 4,146 | 0 |
12 months or more | 65,652 | 67,447 |
Total | 69,798 | 67,447 |
Gross Unrealized Losses |  |  |
Less than 12 months | (262) | 0 |
12 months or more | (11,571) | (10,069) |
Total | (11,833) | (10,069) |
Corporate debt securities |  |  |
Fair Value |  |  |
Less than 12 months | 898,449 | 119,764 |
12 months or more | 725,148 | 905,606 |
Total | 1,623,597 | 1,025,370 |
Gross Unrealized Losses |  |  |
Less than 12 months | (25,547) | (733) |
12 months or more | (80,118) | (87,170) |
Total | (105,665) | (87,903) |
Residential and commercial mortgage securities |  |  |
Fair Value |  |  |
Less than 12 months | 39,931 | 31,936 |
12 months or more | 421,891 | 459,789 |
Total | 461,822 | 491,725 |
Gross Unrealized Losses |  |  |
Less than 12 months | (1,168) | (999) |
12 months or more | (40,886) | (52,510) |
Total | (42,054) | (53,509) |
Asset-backed securities |  |  |
Fair Value |  |  |
Less than 12 months | 188,475 | 65,195 |
12 months or more | 164,683 | 459,324 |
Total | 353,158 | 524,519 |
Gross Unrealized Losses |  |  |
Less than 12 months | (2,701) | (347) |
12 months or more | (8,336) | (19,029) |
Total | $ (11,037) | $ (19,376) |

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