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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Realized gross gains | $ 113 | $ 1,650 | $ 1,005 | $ 14,397 |
Realized gross losses | (348) | (1,370) | (3,141) | (14,634) |
Impairment loss | 0 | $ (105) | (176) | $ (7,411) |
Fair Value |  |  |  |  |
Less than 12 months | 1,089,263 |  | 1,089,263 |  | $ 2,474,361
12 months or more | 3,286,946 |  | 3,286,946 |  | 1,586,877
Total | 4,376,209 |  | 4,376,209 |  | 4,061,238
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (38,805) |  | (38,805) |  | (198,613)
12 months or more | (467,040) |  | (467,040) |  | (248,891)
Total | (505,845) |  | (505,845) |  | (447,504)
U.S. Treasury securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 322,348 |  | 322,348 |  | 321,848
12 months or more | 360,082 |  | 360,082 |  | 169,795
Total | 682,430 |  | 682,430 |  | 491,643
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (4,324) |  | (4,324) |  | (12,381)
12 months or more | (25,653) |  | (25,653) |  | (15,695)
Total | (29,977) |  | (29,977) |  | (28,076)
U.S. agency securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 7,180 |  | 7,180 |  | 7,117
12 months or more | 0 |  | 0 |  | 0
Total | 7,180 |  | 7,180 |  | 7,117
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (18) |  | (18) |  | (8)
12 months or more | 0 |  | 0 |  | 0
Total | (18) |  | (18) |  | (8)
U.S. agency mortgage-backed securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 114,881 |  | 114,881 |  | 351,310
12 months or more | 636,057 |  | 636,057 |  | 415,743
Total | 750,938 |  | 750,938 |  | 767,053
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (6,760) |  | (6,760) |  | (34,193)
12 months or more | (140,979) |  | (140,979) |  | (80,997)
Total | (147,739) |  | (147,739) |  | (115,190)
Municipal debt securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 254,197 |  | 254,197 |  | 335,784
12 months or more | 300,187 |  | 300,187 |  | 64,766
Total | 554,384 |  | 554,384 |  | 400,550
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (11,946) |  | (11,946) |  | (41,620)
12 months or more | (63,144) |  | (63,144) |  | (19,634)
Total | (75,090) |  | (75,090) |  | (61,254)
Non-U.S. government securities: |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 0 |  | 0 |  | 48,071
12 months or more | 48,571 |  | 48,571 |  | 14,328
Total | 48,571 |  | 48,571 |  | 62,399
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | 0 |  | 0 |  | (2,914)
12 months or more | (8,836) |  | (8,836) |  | (4,338)
Total | (8,836) |  | (8,836) |  | (7,252)
Corporate debt securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 264,701 |  | 264,701 |  | 811,217
12 months or more | 991,284 |  | 991,284 |  | 421,307
Total | 1,255,985 |  | 1,255,985 |  | 1,232,524
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (11,767) |  | (11,767) |  | (69,415)
12 months or more | (136,817) |  | (136,817) |  | (63,972)
Total | (148,584) |  | (148,584) |  | (133,387)
Residential and commercial mortgage securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 36,985 |  | 36,985 |  | 265,934
12 months or more | 449,512 |  | 449,512 |  | 242,366
Total | 486,497 |  | 486,497 |  | 508,300
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (3,098) |  | (3,098) |  | (22,628)
12 months or more | (66,785) |  | (66,785) |  | (43,853)
Total | (69,883) |  | (69,883) |  | (66,481)
Asset-backed securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 88,971 |  | 88,971 |  | 333,080
12 months or more | 501,253 |  | 501,253 |  | 258,572
Total | 590,224 |  | 590,224 |  | 591,652
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (892) |  | (892) |  | (15,454)
12 months or more | (24,826) |  | (24,826) |  | (20,402)
Total | $ (25,718) |  | $ (25,718) |  | $ (35,856)

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