v3.26.1
Investments - Schedule of Securities in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 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 $ 940,892 $ 381,919
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (16,189) (6,033)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 1,442,078 1,542,162
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses (160,279) (144,158)
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 0 0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses 0 0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 5,886 5,867
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses (127) (137)
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 37,823 41,809
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (605) (1,307)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 72,311 59,087
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses (6,491) (4,979)
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 7,298 6,321
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (485) (159)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 97,618 98,912
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses (11,025) (10,858)
Corporates [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value 655,724 233,831
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (12,772) (3,593)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 826,440 901,906
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses (80,905) (70,611)
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 108,535 72,537
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (1,436) (463)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 294,937 316,741
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses (50,542) (46,713)
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 11,023 2,471
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (31) (26)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 66,307 71,490
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses (7,172) (7,097)
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 120,489 24,950
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (860) (485)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 78,579 88,159
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses $ (4,017) $ (3,763)