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Investments - Summary of Realized Gain and Loss and Investments in Unrealized Loss Position (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |  |  |
Realized gross gains | $ 3 | $ 869 |
Realized gross losses | (1,143) | $ (1,357) |
Fair Value |  |  |
Less than 12 months | 1,015,494 |  | $ 550,525
12 months or more | 3,034,477 |  | 3,200,767
Total | 4,049,971 |  | 3,751,292
Gross Unrealized Losses |  |  |
Less than 12 months | (8,394) |  | (5,759)
12 months or more | (346,071) |  | (330,678)
Total | (354,465) |  | (336,437)
U.S. Treasury securities |  |  |
Fair Value |  |  |
Less than 12 months | 516,852 |  | 139,398
12 months or more | 318,693 |  | 355,921
Total | 835,545 |  | 495,319
Gross Unrealized Losses |  |  |
Less than 12 months | (2,708) |  | (1,075)
12 months or more | (18,308) |  | (18,053)
Total | (21,016) |  | (19,128)
U.S. agency securities |  |  |
Fair Value |  |  |
Less than 12 months | 1,573 |  | 5,572
12 months or more | 0 |  | 1,623
Total | 1,573 |  | 7,195
Gross Unrealized Losses |  |  |
Less than 12 months | (1) |  | (2)
12 months or more | 0 |  | (2)
Total | (1) |  | (4)
U.S. agency mortgage-backed securities |  |  |
Fair Value |  |  |
Less than 12 months | 92,502 |  | 129,359
12 months or more | 683,424 |  | 654,018
Total | 775,926 |  | 783,377
Gross Unrealized Losses |  |  |
Less than 12 months | (1,363) |  | (1,616)
12 months or more | (113,182) |  | (100,383)
Total | (114,545) |  | (101,999)
Municipal debt securities |  |  |
Fair Value |  |  |
Less than 12 months | 62,169 |  | 59,301
12 months or more | 318,055 |  | 297,039
Total | 380,224 |  | 356,340
Gross Unrealized Losses |  |  |
Less than 12 months | (882) |  | (987)
12 months or more | (44,309) |  | (43,462)
Total | (45,191) |  | (44,449)
Non-U.S. government securities: |  |  |
Fair Value |  |  |
Less than 12 months | 0 |  | 0
12 months or more | 66,395 |  | 67,447
Total | 66,395 |  | 67,447
Gross Unrealized Losses |  |  |
Less than 12 months | 0 |  | 0
12 months or more | (11,048) |  | (10,069)
Total | (11,048) |  | (10,069)
Corporate debt securities |  |  |
Fair Value |  |  |
Less than 12 months | 202,873 |  | 119,764
12 months or more | 888,500 |  | 905,606
Total | 1,091,373 |  | 1,025,370
Gross Unrealized Losses |  |  |
Less than 12 months | (2,606) |  | (733)
12 months or more | (92,059) |  | (87,170)
Total | (94,665) |  | (87,903)
Residential and commercial mortgage securities |  |  |
Fair Value |  |  |
Less than 12 months | 20,677 |  | 31,936
12 months or more | 473,205 |  | 459,789
Total | 493,882 |  | 491,725
Gross Unrealized Losses |  |  |
Less than 12 months | (323) |  | (999)
12 months or more | (51,978) |  | (52,510)
Total | (52,301) |  | (53,509)
Asset-backed securities |  |  |
Fair Value |  |  |
Less than 12 months | 118,848 |  | 65,195
12 months or more | 286,205 |  | 459,324
Total | 405,053 |  | 524,519
Gross Unrealized Losses |  |  |
Less than 12 months | (511) |  | (347)
12 months or more | (15,187) |  | (19,029)
Total | $ (15,698) |  | $ (19,376)

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