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Investments - Summary of Realized Gain and Loss and Investments in Unrealized Loss Position (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Realized gross gains | $ 360 | $ 113 | $ 415 | $ 1,005 |
Realized gross losses | (292) | (348) | (2,128) | (3,141) |
Impairment loss | 0 | $ 0 | (523) | $ (176) |
Fair Value |  |  |  |  |
Less than 12 months | 436,716 |  | 436,716 |  | $ 550,525
12 months or more | 2,763,701 |  | 2,763,701 |  | 3,200,767
Total | 3,200,417 |  | 3,200,417 |  | 3,751,292
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (2,325) |  | (2,325) |  | (5,759)
12 months or more | (246,686) |  | (246,686) |  | (330,678)
Total | (249,011) |  | (249,011) |  | (336,437)
U.S. Treasury securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 63,050 |  | 63,050 |  | 139,398
12 months or more | 315,890 |  | 315,890 |  | 355,921
Total | 378,940 |  | 378,940 |  | 495,319
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (11) |  | (11) |  | (1,075)
12 months or more | (11,020) |  | (11,020) |  | (18,053)
Total | (11,031) |  | (11,031) |  | (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 | 98,220 |  | 98,220 |  | 129,359
12 months or more | 677,515 |  | 677,515 |  | 654,018
Total | 775,735 |  | 775,735 |  | 783,377
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (796) |  | (796) |  | (1,616)
12 months or more | (83,899) |  | (83,899) |  | (100,383)
Total | (84,695) |  | (84,695) |  | (101,999)
Municipal debt securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 33,660 |  | 33,660 |  | 59,301
12 months or more | 298,168 |  | 298,168 |  | 297,039
Total | 331,828 |  | 331,828 |  | 356,340
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (224) |  | (224) |  | (987)
12 months or more | (34,333) |  | (34,333) |  | (43,462)
Total | (34,557) |  | (34,557) |  | (44,449)
Non-U.S. government securities: |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 4,383 |  | 4,383 |  | 0
12 months or more | 68,588 |  | 68,588 |  | 67,447
Total | 72,971 |  | 72,971 |  | 67,447
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (29) |  | (29) |  | 0
12 months or more | (8,708) |  | (8,708) |  | (10,069)
Total | (8,737) |  | (8,737) |  | (10,069)
Corporate debt securities: |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 188,259 |  | 188,259 |  | 119,764
12 months or more | 768,267 |  | 768,267 |  | 905,606
Total | 956,526 |  | 956,526 |  | 1,025,370
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (856) |  | (856) |  | (733)
12 months or more | (63,255) |  | (63,255) |  | (87,170)
Total | (64,111) |  | (64,111) |  | (87,903)
Residential and commercial mortgage securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 3,649 |  | 3,649 |  | 31,936
12 months or more | 448,587 |  | 448,587 |  | 459,789
Total | 452,236 |  | 452,236 |  | 491,725
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (173) |  | (173) |  | (999)
12 months or more | (35,944) |  | (35,944) |  | (52,510)
Total | (36,117) |  | (36,117) |  | (53,509)
Asset-backed securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 45,495 |  | 45,495 |  | 65,195
12 months or more | 186,686 |  | 186,686 |  | 459,324
Total | 232,181 |  | 232,181 |  | 524,519
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (236) |  | (236) |  | (347)
12 months or more | (9,527) |  | (9,527) |  | (19,029)
Total | $ (9,763) |  | $ (9,763) |  | $ (19,376)

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