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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, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Realized gross gains | $ 1,650 | $ 654 | $ 14,397 | $ 1,422 |
Realized gross losses | (1,370) | (433) | (14,634) | (813) |
Impairment loss | (105) | $ 0 | (7,411) | $ 0 |
Fair Value |  |  |  |  |
Less than 12 months | 3,473,897 |  | 3,473,897 |  | $ 2,033,809
12 months or more | 838,629 |  | 838,629 |  | 152,687
Total | 4,312,526 |  | 4,312,526 |  | 2,186,496
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (352,622) |  | (352,622) |  | (28,074)
12 months or more | (138,758) |  | (138,758) |  | (5,393)
Total | (491,380) |  | (491,380) |  | (33,467)
U.S. Treasury securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 361,655 |  | 361,655 |  | 207,122
12 months or more | 161,968 |  | 161,968 |  | 28,012
Total | 523,623 |  | 523,623 |  | 235,134
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (15,490) |  | (15,490) |  | (2,170)
12 months or more | (15,342) |  | (15,342) |  | (796)
Total | (30,832) |  | (30,832) |  | (2,966)
U.S. agency mortgage-backed securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 508,415 |  | 508,415 |  | 582,108
12 months or more | 243,821 |  | 243,821 |  | 26,131
Total | 752,236 |  | 752,236 |  | 608,239
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (74,350) |  | (74,350) |  | (9,414)
12 months or more | (52,442) |  | (52,442) |  | (699)
Total | (126,792) |  | (126,792) |  | (10,113)
Municipal debt securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 527,796 |  | 527,796 |  | 91,719
12 months or more | 14,588 |  | 14,588 |  | 312
Total | 542,384 |  | 542,384 |  | 92,031
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (64,097) |  | (64,097) |  | (1,281)
12 months or more | (3,986) |  | (3,986) |  | (6)
Total | (68,083) |  | (68,083) |  | (1,287)
Non-U.S. government securities: |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 51,784 |  | 51,784 |  | 22,986
12 months or more | 9,050 |  | 9,050 |  | 0
Total | 60,834 |  | 60,834 |  | 22,986
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (5,922) |  | (5,922) |  | (855)
12 months or more | (3,370) |  | (3,370) |  | 0
Total | (9,292) |  | (9,292) |  | (855)
Corporate debt securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 1,166,786 |  | 1,166,786 |  | 522,120
12 months or more | 143,745 |  | 143,745 |  | 46,875
Total | 1,310,531 |  | 1,310,531 |  | 568,995
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (127,688) |  | (127,688) |  | (7,200)
12 months or more | (28,200) |  | (28,200) |  | (2,265)
Total | (155,888) |  | (155,888) |  | (9,465)
Residential and commercial mortgage securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 376,356 |  | 376,356 |  | 268,617
12 months or more | 143,118 |  | 143,118 |  | 38,256
Total | 519,474 |  | 519,474 |  | 306,873
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (38,046) |  | (38,046) |  | (5,200)
12 months or more | (25,240) |  | (25,240) |  | (1,467)
Total | (63,286) |  | (63,286) |  | (6,667)
Asset-backed securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 481,105 |  | 481,105 |  | 339,137
12 months or more | 122,339 |  | 122,339 |  | 13,101
Total | 603,444 |  | 603,444 |  | 352,238
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (27,029) |  | (27,029) |  | (1,954)
12 months or more | (10,178) |  | (10,178) |  | (160)
Total | $ (37,207) |  | $ (37,207) |  | $ (2,114)

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