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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Realized gross gains | $ 23 | $ 171 | $ 892 | $ 12,747 |
Realized gross losses | (1,436) | (173) | (2,793) | (13,264) |
Impairment loss | (176) | $ (469) | (176) | $ (7,306) |
Fair Value |  |  |  |  |
Less than 12 months | 1,249,263 |  | 1,249,263 |  | $ 2,474,361
12 months or more | 3,000,615 |  | 3,000,615 |  | 1,586,877
Total | 4,249,878 |  | 4,249,878 |  | 4,061,238
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (29,430) |  | (29,430) |  | (198,613)
12 months or more | (393,323) |  | (393,323) |  | (248,891)
Total | (422,753) |  | (422,753) |  | (447,504)
U.S. Treasury securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 274,448 |  | 274,448 |  | 321,848
12 months or more | 293,776 |  | 293,776 |  | 169,795
Total | 568,224 |  | 568,224 |  | 491,643
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (4,066) |  | (4,066) |  | (12,381)
12 months or more | (23,388) |  | (23,388) |  | (15,695)
Total | (27,454) |  | (27,454) |  | (28,076)
U.S. agency securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 9,671 |  | 9,671 |  | 7,117
12 months or more | 0 |  | 0 |  | 0
Total | 9,671 |  | 9,671 |  | 7,117
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (27) |  | (27) |  | (8)
12 months or more | 0 |  | 0 |  | 0
Total | (27) |  | (27) |  | (8)
U.S. agency mortgage-backed securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 169,514 |  | 169,514 |  | 351,310
12 months or more | 623,847 |  | 623,847 |  | 415,743
Total | 793,361 |  | 793,361 |  | 767,053
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (5,925) |  | (5,925) |  | (34,193)
12 months or more | (108,241) |  | (108,241) |  | (80,997)
Total | (114,166) |  | (114,166) |  | (115,190)
Municipal debt securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 196,380 |  | 196,380 |  | 335,784
12 months or more | 253,299 |  | 253,299 |  | 64,766
Total | 449,679 |  | 449,679 |  | 400,550
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (4,163) |  | (4,163) |  | (41,620)
12 months or more | (45,758) |  | (45,758) |  | (19,634)
Total | (49,921) |  | (49,921) |  | (61,254)
Non-U.S. government securities: |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 15,664 |  | 15,664 |  | 48,071
12 months or more | 34,889 |  | 34,889 |  | 14,328
Total | 50,553 |  | 50,553 |  | 62,399
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (411) |  | (411) |  | (2,914)
12 months or more | (6,481) |  | (6,481) |  | (4,338)
Total | (6,892) |  | (6,892) |  | (7,252)
Corporate debt securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 399,331 |  | 399,331 |  | 811,217
12 months or more | 856,101 |  | 856,101 |  | 421,307
Total | 1,255,432 |  | 1,255,432 |  | 1,232,524
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (10,073) |  | (10,073) |  | (69,415)
12 months or more | (115,129) |  | (115,129) |  | (63,972)
Total | (125,202) |  | (125,202) |  | (133,387)
Residential and commercial mortgage securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 60,682 |  | 60,682 |  | 265,934
12 months or more | 443,965 |  | 443,965 |  | 242,366
Total | 504,647 |  | 504,647 |  | 508,300
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (3,586) |  | (3,586) |  | (22,628)
12 months or more | (61,835) |  | (61,835) |  | (43,853)
Total | (65,421) |  | (65,421) |  | (66,481)
Asset-backed securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 123,573 |  | 123,573 |  | 333,080
12 months or more | 494,738 |  | 494,738 |  | 258,572
Total | 618,311 |  | 618,311 |  | 591,652
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (1,179) |  | (1,179) |  | (15,454)
12 months or more | (32,491) |  | (32,491) |  | (20,402)
Total | $ (33,670) |  | $ (33,670) |  | $ (35,856)

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