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Investments - Schedule of Realized Gain and Loss and Investments in Unrealized Loss Position (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Realized gross gains | $ 40 | $ 360 | $ 59 | $ 415 |
Realized gross losses | (425) | (292) | (754) | (2,128) |
Impairment loss | (40) | $ 0 | (40) | $ (523) |
Fair Value |  |  |  |  |
Less than 12 months | 546,646 |  | 546,646 |  | $ 1,954,295
12 months or more | 2,458,107 |  | 2,458,107 |  | 2,567,865
Total | 3,004,753 |  | 3,004,753 |  | 4,522,160
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (8,341) |  | (8,341) |  | (50,014)
12 months or more | (218,879) |  | (218,879) |  | (308,438)
Total | (227,220) |  | (227,220) |  | (358,452)
U.S. Treasury securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 15,373 |  | 15,373 |  | 141,789
12 months or more | 206,912 |  | 206,912 |  | 279,143
Total | 222,285 |  | 222,285 |  | 420,932
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (97) |  | (97) |  | (1,620)
12 months or more | (7,031) |  | (7,031) |  | (13,268)
Total | (7,128) |  | (7,128) |  | (14,888)
U.S. agency mortgage-backed securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 122,399 |  | 122,399 |  | 476,695
12 months or more | 654,260 |  | 654,260 |  | 629,036
Total | 776,659 |  | 776,659 |  | 1,105,731
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (1,534) |  | (1,534) |  | (13,028)
12 months or more | (81,380) |  | (81,380) |  | (110,837)
Total | (82,914) |  | (82,914) |  | (123,865)
Municipal debt securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 111,110 |  | 111,110 |  | 204,810
12 months or more | 286,020 |  | 286,020 |  | 282,312
Total | 397,130 |  | 397,130 |  | 487,122
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (2,420) |  | (2,420) |  | (5,688)
12 months or more | (35,566) |  | (35,566) |  | (43,422)
Total | (37,986) |  | (37,986) |  | (49,110)
Non-U.S. government securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 0 |  | 0 |  | 4,146
12 months or more | 57,173 |  | 57,173 |  | 65,652
Total | 57,173 |  | 57,173 |  | 69,798
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | 0 |  | 0 |  | (262)
12 months or more | (8,603) |  | (8,603) |  | (11,571)
Total | (8,603) |  | (8,603) |  | (11,833)
Corporate debt securities: |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 152,570 |  | 152,570 |  | 898,449
12 months or more | 746,781 |  | 746,781 |  | 725,148
Total | 899,351 |  | 899,351 |  | 1,623,597
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (1,704) |  | (1,704) |  | (25,547)
12 months or more | (54,743) |  | (54,743) |  | (80,118)
Total | (56,447) |  | (56,447) |  | (105,665)
Residential and commercial mortgage securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 42,064 |  | 42,064 |  | 39,931
12 months or more | 365,795 |  | 365,795 |  | 421,891
Total | 407,859 |  | 407,859 |  | 461,822
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (950) |  | (950) |  | (1,168)
12 months or more | (25,254) |  | (25,254) |  | (40,886)
Total | (26,204) |  | (26,204) |  | (42,054)
Asset-backed securities |  |  |  |  |
Fair Value |  |  |  |  |
Less than 12 months | 103,130 |  | 103,130 |  | 188,475
12 months or more | 141,166 |  | 141,166 |  | 164,683
Total | 244,296 |  | 244,296 |  | 353,158
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (1,636) |  | (1,636) |  | (2,701)
12 months or more | (6,302) |  | (6,302) |  | (8,336)
Total | $ (7,938) |  | $ (7,938) |  | $ (11,037)

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