v3.26.3
Investments - Schedule of Security Holdings in an Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 months, Estimated fair value $ 537,158 $ 71,429
Less than 12 months, Gross unrealized losses (19,198) (164)
12 months or longer, Estimated fair value 415 47,179
12 months or longer, Gross unrealized losses (32) (502)
Estimated fair value 537,573 118,608
Gross unrealized losses (19,230) (666)
Corporate    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 months, Estimated fair value 200,902 6,307
Less than 12 months, Gross unrealized losses (6,885) (7)
12 months or longer, Estimated fair value 307 9,461
12 months or longer, Gross unrealized losses (30) (108)
Estimated fair value 201,209 15,768
Gross unrealized losses (6,915) (115)
U.S. Treasury    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 months, Estimated fair value 97,979 35,150
Less than 12 months, Gross unrealized losses (3,238) (83)
12 months or longer, Estimated fair value 108 14,948
12 months or longer, Gross unrealized losses (2) (78)
Estimated fair value 98,087 50,098
Gross unrealized losses (3,240) (161)
States and municipalities    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 months, Estimated fair value 30,136 880
Less than 12 months, Gross unrealized losses (1,205) (3)
12 months or longer, Estimated fair value 0 0
12 months or longer, Gross unrealized losses 0 0
Estimated fair value 30,136 880
Gross unrealized losses (1,205) (3)
Foreign    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 months, Estimated fair value 28,869 17,009
Less than 12 months, Gross unrealized losses (414) (62)
12 months or longer, Estimated fair value 0 0
12 months or longer, Gross unrealized losses 0 0
Estimated fair value 28,869 17,009
Gross unrealized losses (414) (62)
Asset-backed securities    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 months, Estimated fair value 48,312 1,771
Less than 12 months, Gross unrealized losses (772) (5)
12 months or longer, Estimated fair value 0 1,881
12 months or longer, Gross unrealized losses 0 (37)
Estimated fair value 48,312 3,652
Gross unrealized losses (772) (42)
Mortgage-backed securities    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 months, Estimated fair value 130,960 10,312
Less than 12 months, Gross unrealized losses (6,684) (4)
12 months or longer, Estimated fair value 0 20,889
12 months or longer, Gross unrealized losses 0 (279)
Estimated fair value 130,960 31,201
Gross unrealized losses $ (6,684) $ (283)