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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 | Jun. 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 | $ 33,667 | $ 77,698
AFS Unrealized Losses, Less than 12 months | (52) | (188)
AFS Fair Value, 12 months or longer | 107,306 | 108,578
AFS Unrealized Losses, 12 months or longer | (19,855) | (18,073)
AFS Fair Value | 140,973 | 186,276
AFS Unrealized Losses | (19,907) | (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 | 9,234 | 8,251
AFS Unrealized Losses, 12 months or longer | (1,427) | (1,215)
AFS Fair Value | 9,234 | 9,803
AFS Unrealized Losses | (1,427) | (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 | 128,665 | 137,031
AFS Unrealized Losses, Less than 12 months | (1,644) | (962)
AFS Fair Value, 12 months or longer | 329,528 | 290,964
AFS Unrealized Losses, 12 months or longer | (31,507) | (27,965)
AFS Fair Value | 458,193 | 427,995
AFS Unrealized Losses | (33,151) | (28,927)
Corporate securities |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
AFS Fair Value, Less than 12 Months | 358,779 | 263,423
AFS Unrealized Losses, Less than 12 months | (3,477) | (6,369)
AFS Fair Value, 12 months or longer | 1,477,738 | 1,439,422
AFS Unrealized Losses, 12 months or longer | (140,248) | (131,519)
AFS Fair Value | 1,836,517 | 1,702,845
AFS Unrealized Losses | (143,725) | (137,888)
CLO and other ABS |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
AFS Fair Value, Less than 12 Months | 368,307 | 278,940
AFS Unrealized Losses, Less than 12 months | (6,432) | (7,120)
AFS Fair Value, 12 months or longer | 798,783 | 984,175
AFS Unrealized Losses, 12 months or longer | (63,472) | (78,885)
AFS Fair Value | 1,167,090 | 1,263,115
AFS Unrealized Losses | (69,904) | (86,005)
RMBS |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
AFS Fair Value, Less than 12 Months | 385,794 | 351,976
AFS Unrealized Losses, Less than 12 months | (6,133) | (4,765)
AFS Fair Value, 12 months or longer | 878,915 | 757,914
AFS Unrealized Losses, 12 months or longer | (105,287) | (81,086)
AFS Fair Value | 1,264,709 | 1,109,890
AFS Unrealized Losses | (111,420) | (85,851)
CMBS |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
AFS Fair Value, Less than 12 Months | 75,052 | 130,189
AFS Unrealized Losses, Less than 12 months | (779) | (2,995)
AFS Fair Value, 12 months or longer | 550,901 | 471,256
AFS Unrealized Losses, 12 months or longer | (38,599) | (42,135)
AFS Fair Value | 625,953 | 601,445
AFS Unrealized Losses | (39,378) | (45,130)
Available-for-Sale Securities |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
AFS Fair Value, Less than 12 Months | 1,350,264 | 1,240,809
AFS Unrealized Losses, Less than 12 months | (18,517) | (22,486)
AFS Fair Value, 12 months or longer | 4,152,405 | 4,060,560
AFS Unrealized Losses, 12 months or longer | (400,395) | (380,878)
AFS Fair Value | 5,502,669 | 5,301,369
AFS Unrealized Losses | $ (418,912) | $ (403,364)

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