v3.26.1
Investments - Schedule of Securities in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value $ 930,562  
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (12,646)  
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 1,375,394  
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses (153,334)  
Fixed-Maturity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value 925,612 $ 381,919
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (12,643) (6,033)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 1,375,394 1,542,162
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses (153,334) (144,158)
Fixed-Maturity Securities [Member] | U.S. Government and Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value 1,815 0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (4) 0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 5,032 5,867
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses (116) (137)
Fixed-Maturity Securities [Member] | Foreign Government [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value 23,446 41,809
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (279) (1,307)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 70,565 59,087
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses (5,245) (4,979)
Fixed-Maturity Securities [Member] | States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value 8,550 6,321
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (569) (159)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 96,172 98,912
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses (10,444) (10,858)
Fixed-Maturity Securities [Member] | Corporates [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value 635,294 233,831
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (9,026) (3,593)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 783,776 901,906
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses (75,257) (70,611)
Fixed-Maturity Securities [Member] | Residential Mortgage-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value 135,432 72,537
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (1,709) (463)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 285,402 316,741
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses (51,437) (46,713)
Fixed-Maturity Securities [Member] | Commercial Mortgage-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value 5,026 2,471
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (27) (26)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 66,038 71,490
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses (6,949) (7,097)
Fixed-Maturity Securities [Member] | Other Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value 116,049 24,950
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (1,029) (485)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 68,409 88,159
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses (3,886) $ (3,763)
Short-Term Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value 4,950  
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (3)  
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 0  
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses 0  
Short-Term Investments [Member] | Foreign Government [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value 4,950  
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (3)  
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 0  
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses $ 0