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Investments - Summary of Realized Gain and Loss and Investments in Unrealized Loss Position (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Realized gross gains | $ 51 | $ 23 | $ 55 | $ 892 |
Realized gross losses | (692) | (1,436) | (1,836) | (2,793) |
Impairment loss | (523) | $ (176) | (523) | $ (176) |
Fair Value |  |  |  |  |
Less than 12 months | 1,184,590 |  | 1,184,590 |  | $ 550,525
12 months or more | 2,697,361 |  | 2,697,361 |  | 3,200,767
Total | 3,881,951 |  | 3,881,951 |  | 3,751,292
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (26,402) |  | (26,402) |  | (5,759)
12 months or more | (333,218) |  | (333,218) |  | (330,678)
Total | (359,620) |  | (359,620) |  | (336,437)
U.S. Treasury securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 676,520 |  | 676,520 |  | 139,398
12 months or more | 156,302 |  | 156,302 |  | 355,921
Total | 832,822 |  | 832,822 |  | 495,319
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (10,015) |  | (10,015) |  | (1,075)
12 months or more | (10,358) |  | (10,358) |  | (18,053)
Total | (20,373) |  | (20,373) |  | (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 | 79,991 |  | 79,991 |  | 129,359
12 months or more | 670,718 |  | 670,718 |  | 654,018
Total | 750,709 |  | 750,709 |  | 783,377
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (2,181) |  | (2,181) |  | (1,616)
12 months or more | (116,303) |  | (116,303) |  | (100,383)
Total | (118,484) |  | (118,484) |  | (101,999)
Municipal debt securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 91,994 |  | 91,994 |  | 59,301
12 months or more | 309,410 |  | 309,410 |  | 297,039
Total | 401,404 |  | 401,404 |  | 356,340
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (2,191) |  | (2,191) |  | (987)
12 months or more | (44,733) |  | (44,733) |  | (43,462)
Total | (46,924) |  | (46,924) |  | (44,449)
Non-U.S. government securities: |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 2,999 |  | 2,999 |  | 0
12 months or more | 63,032 |  | 63,032 |  | 67,447
Total | 66,031 |  | 66,031 |  | 67,447
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (1,406) |  | (1,406) |  | 0
12 months or more | (9,933) |  | (9,933) |  | (10,069)
Total | (11,339) |  | (11,339) |  | (10,069)
Corporate debt securities: |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 256,400 |  | 256,400 |  | 119,764
12 months or more | 812,456 |  | 812,456 |  | 905,606
Total | 1,068,856 |  | 1,068,856 |  | 1,025,370
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (7,793) |  | (7,793) |  | (733)
12 months or more | (89,553) |  | (89,553) |  | (87,170)
Total | (97,346) |  | (97,346) |  | (87,903)
Residential and commercial mortgage securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 27,485 |  | 27,485 |  | 31,936
12 months or more | 457,287 |  | 457,287 |  | 459,789
Total | 484,772 |  | 484,772 |  | 491,725
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (1,716) |  | (1,716) |  | (999)
12 months or more | (50,253) |  | (50,253) |  | (52,510)
Total | (51,969) |  | (51,969) |  | (53,509)
Asset-backed securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 49,201 |  | 49,201 |  | 65,195
12 months or more | 228,156 |  | 228,156 |  | 459,324
Total | 277,357 |  | 277,357 |  | 524,519
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (1,100) |  | (1,100) |  | (347)
12 months or more | (12,085) |  | (12,085) |  | (19,029)
Total | $ (13,185) |  | $ (13,185) |  | $ (19,376)

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