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Investments - Schedule of Fair Value and Gross Pre-Tax Net Unrealized Loss of Securities By Length of Time (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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U.S. government and government agencies |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
AFS Fair Value, Less than 12 Months | $ 352 | $ 77,698
AFS Unrealized Losses, Less than 12 months | (36) | (188)
AFS Fair Value, 12 months or longer | 110,409 | 108,578
AFS Unrealized Losses, 12 months or longer | (14,545) | (18,073)
AFS Fair Value | 110,761 | 186,276
AFS Unrealized Losses | (14,581) | (18,261)
Foreign government |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
AFS Fair Value, Less than 12 Months | 0 | 1,552
AFS Unrealized Losses, Less than 12 months | 0 | (87)
AFS Fair Value, 12 months or longer | 9,662 | 8,251
AFS Unrealized Losses, 12 months or longer | (985) | (1,215)
AFS Fair Value | 9,662 | 9,803
AFS Unrealized Losses | (985) | (1,302)
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
AFS Fair Value, Less than 12 Months | 49,972 | 137,031
AFS Unrealized Losses, Less than 12 months | (322) | (962)
AFS Fair Value, 12 months or longer | 264,599 | 290,964
AFS Unrealized Losses, 12 months or longer | (21,301) | (27,965)
AFS Fair Value | 314,571 | 427,995
AFS Unrealized Losses | (21,623) | (28,927)
Corporate securities |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
AFS Fair Value, Less than 12 Months | 164,625 | 263,423
AFS Unrealized Losses, Less than 12 months | (1,246) | (6,369)
AFS Fair Value, 12 months or longer | 1,158,745 | 1,439,422
AFS Unrealized Losses, 12 months or longer | (85,772) | (131,519)
AFS Fair Value | 1,323,370 | 1,702,845
AFS Unrealized Losses | (87,018) | (137,888)
CLO and other ABS |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
AFS Fair Value, Less than 12 Months | 264,653 | 278,940
AFS Unrealized Losses, Less than 12 months | (5,352) | (7,120)
AFS Fair Value, 12 months or longer | 657,379 | 984,175
AFS Unrealized Losses, 12 months or longer | (43,318) | (78,885)
AFS Fair Value | 922,032 | 1,263,115
AFS Unrealized Losses | (48,670) | (86,005)
RMBS |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
AFS Fair Value, Less than 12 Months | 233,580 | 351,976
AFS Unrealized Losses, Less than 12 months | (966) | (4,765)
AFS Fair Value, 12 months or longer | 727,552 | 757,914
AFS Unrealized Losses, 12 months or longer | (62,595) | (81,086)
AFS Fair Value | 961,132 | 1,109,890
AFS Unrealized Losses | (63,561) | (85,851)
CMBS |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
AFS Fair Value, Less than 12 Months | 27,946 | 130,189
AFS Unrealized Losses, Less than 12 months | (107) | (2,995)
AFS Fair Value, 12 months or longer | 451,713 | 471,256
AFS Unrealized Losses, 12 months or longer | (23,403) | (42,135)
AFS Fair Value | 479,659 | 601,445
AFS Unrealized Losses | (23,510) | (45,130)
Available-for-Sale Securities |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
AFS Fair Value, Less than 12 Months | 741,128 | 1,240,809
AFS Unrealized Losses, Less than 12 months | (8,029) | (22,486)
AFS Fair Value, 12 months or longer | 3,380,059 | 4,060,560
AFS Unrealized Losses, 12 months or longer | (251,919) | (380,878)
AFS Fair Value | 4,121,187 | 5,301,369
AFS Unrealized Losses | $ (259,948) | $ (403,364)

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