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Investments - Schedule of Securities in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value $ 178,517 $ 550,105
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (2,944) (12,617)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 1,611,250 1,721,039
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses (152,212) (209,312)
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   3,529
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses   (19)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 5,828 5,660
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses (166) (307)
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 23,091 15,044
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (690) (139)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 66,503 83,923
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses (4,666) (6,067)
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 5,250 9,933
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (230) (350)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 98,196 99,389
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses (11,666) (14,536)
Corporates [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value 109,343 398,232
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (1,507) (9,422)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 920,689 1,000,264
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses (71,816) (106,673)
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 30,442 106,276
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (103) (2,605)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 347,753 327,850
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses (52,381) (63,985)
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 2,202 2,005
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (4) (1)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 73,463 89,876
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses (7,473) (11,067)
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 8,189 15,086
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses (410) (81)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value 98,818 114,077
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses $ (4,044) $ (6,677)