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v3.25.1

Investments - Schedule of Realized Gain and Loss and Investments in Unrealized Loss Position (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract] |  |  |
Realized gross gains | $ 0 | $ 3 |
Realized gross losses | (181) | $ (1,143) |
Fair Value |  |  |
Less than 12 months | 1,579,473 |  | $ 1,954,295
12 months or more | 2,454,644 |  | 2,567,865
Total | 4,034,117 |  | 4,522,160
Gross Unrealized Losses |  |  |
Less than 12 months | (25,377) |  | (50,014)
12 months or more | (257,009) |  | (308,438)
Total | (282,386) |  | (358,452)
U.S. Treasury securities |  |  |
Fair Value |  |  |
Less than 12 months | 63,222 |  | 141,789
12 months or more | 278,244 |  | 279,143
Total | 341,466 |  | 420,932
Gross Unrealized Losses |  |  |
Less than 12 months | (196) |  | (1,620)
12 months or more | (10,207) |  | (13,268)
Total | (10,403) |  | (14,888)
U.S. agency mortgage-backed securities |  |  |
Fair Value |  |  |
Less than 12 months | 306,077 |  | 476,695
12 months or more | 604,998 |  | 629,036
Total | 911,075 |  | 1,105,731
Gross Unrealized Losses |  |  |
Less than 12 months | (4,678) |  | (13,028)
12 months or more | (86,735) |  | (110,837)
Total | (91,413) |  | (123,865)
Municipal debt securities |  |  |
Fair Value |  |  |
Less than 12 months | 185,865 |  | 204,810
12 months or more | 287,275 |  | 282,312
Total | 473,140 |  | 487,122
Gross Unrealized Losses |  |  |
Less than 12 months | (4,408) |  | (5,688)
12 months or more | (38,798) |  | (43,422)
Total | (43,206) |  | (49,110)
Non-U.S. government securities: |  |  |
Fair Value |  |  |
Less than 12 months | 0 |  | 4,146
12 months or more | 61,870 |  | 65,652
Total | 61,870 |  | 69,798
Gross Unrealized Losses |  |  |
Less than 12 months | 0 |  | (262)
12 months or more | (10,468) |  | (11,571)
Total | (10,468) |  | (11,833)
Corporate debt securities: |  |  |
Fair Value |  |  |
Less than 12 months | 762,984 |  | 898,449
12 months or more | 665,362 |  | 725,148
Total | 1,428,346 |  | 1,623,597
Gross Unrealized Losses |  |  |
Less than 12 months | (13,455) |  | (25,547)
12 months or more | (68,024) |  | (80,118)
Total | (81,479) |  | (105,665)
Residential and commercial mortgage securities |  |  |
Fair Value |  |  |
Less than 12 months | 29,793 |  | 39,931
12 months or more | 410,962 |  | 421,891
Total | 440,755 |  | 461,822
Gross Unrealized Losses |  |  |
Less than 12 months | (569) |  | (1,168)
12 months or more | (35,379) |  | (40,886)
Total | (35,948) |  | (42,054)
Asset-backed securities |  |  |
Fair Value |  |  |
Less than 12 months | 231,532 |  | 188,475
12 months or more | 145,933 |  | 164,683
Total | 377,465 |  | 353,158
Gross Unrealized Losses |  |  |
Less than 12 months | (2,071) |  | (2,701)
12 months or more | (7,398) |  | (8,336)
Total | $ (9,469) |  | $ (11,037)

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