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Investments - Fair Value and Gross Pre-Tax Net Unrealized Loss of Securities By Length of Time (Details) - USD ($) $ in Thousands | Mar. 31, 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 | $ 8,149 | $ 77,698
AFS Unrealized Losses, Less than 12 months | (49) | (188)
AFS Fair Value, 12 months or longer | 107,151 | 108,578
AFS Unrealized Losses, 12 months or longer | (19,530) | (18,073)
AFS Fair Value | 115,300 | 186,276
AFS Unrealized Losses | (19,579) | (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 | 9,229 | 8,251
AFS Unrealized Losses, 12 months or longer | (1,445) | (1,215)
AFS Fair Value | 9,229 | 9,803
AFS Unrealized Losses | (1,445) | (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 | 161,084 | 137,031
AFS Unrealized Losses, Less than 12 months | (1,289) | (962)
AFS Fair Value, 12 months or longer | 303,259 | 290,964
AFS Unrealized Losses, 12 months or longer | (30,569) | (27,965)
AFS Fair Value | 464,343 | 427,995
AFS Unrealized Losses | (31,858) | (28,927)
Corporate securities |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
AFS Fair Value, Less than 12 Months | 316,330 | 263,423
AFS Unrealized Losses, Less than 12 months | (4,043) | (6,369)
AFS Fair Value, 12 months or longer | 1,446,157 | 1,439,422
AFS Unrealized Losses, 12 months or longer | (136,142) | (131,519)
AFS Fair Value | 1,762,487 | 1,702,845
AFS Unrealized Losses | (140,185) | (137,888)
CLO and other ABS |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
AFS Fair Value, Less than 12 Months | 385,471 | 278,940
AFS Unrealized Losses, Less than 12 months | (7,527) | (7,120)
AFS Fair Value, 12 months or longer | 824,843 | 984,175
AFS Unrealized Losses, 12 months or longer | (66,470) | (78,885)
AFS Fair Value | 1,210,314 | 1,263,115
AFS Unrealized Losses | (73,997) | (86,005)
RMBS |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
AFS Fair Value, Less than 12 Months | 511,009 | 351,976
AFS Unrealized Losses, Less than 12 months | (8,770) | (4,765)
AFS Fair Value, 12 months or longer | 761,356 | 757,914
AFS Unrealized Losses, 12 months or longer | (95,467) | (81,086)
AFS Fair Value | 1,272,365 | 1,109,890
AFS Unrealized Losses | (104,237) | (85,851)
CMBS |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
AFS Fair Value, Less than 12 Months | 133,266 | 130,189
AFS Unrealized Losses, Less than 12 months | (2,033) | (2,995)
AFS Fair Value, 12 months or longer | 494,395 | 471,256
AFS Unrealized Losses, 12 months or longer | (37,679) | (42,135)
AFS Fair Value | 627,661 | 601,445
AFS Unrealized Losses | (39,712) | (45,130)
Available-for-Sale Securities |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
AFS Fair Value, Less than 12 Months | 1,515,309 | 1,240,809
AFS Unrealized Losses, Less than 12 months | (23,711) | (22,486)
AFS Fair Value, 12 months or longer | 3,946,390 | 4,060,560
AFS Unrealized Losses, 12 months or longer | (387,302) | (380,878)
AFS Fair Value | 5,461,699 | 5,301,369
AFS Unrealized Losses | $ (411,013) | $ (403,364)

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