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Fixed-Maturity Securities Available-For-Sale - Schedule of Company's Investments Estimated Fair Value and Gross Unrealized Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Estimated Fair Value Less than 12 months $ 28,395 $ 222,037
Unrealized Losses Less than 12 months (121) (2,067)
Estimated Fair Value More than 12 months 6,144 10,090
Unrealized Losses More than 12 months (62) (105)
Total Estimated Fair Value 34,539 232,127
Total Unrealized Losses (183) (2,172)
U.S. government and agencies    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Estimated Fair Value Less than 12 months 2,030 93,063
Unrealized Losses Less than 12 months 0 (729)
Estimated Fair Value More than 12 months 1,724 2,975
Unrealized Losses More than 12 months (14) (47)
Total Estimated Fair Value 3,754 96,038
Total Unrealized Losses (14) (776)
States, municipalities and political subdivisions    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Estimated Fair Value Less than 12 months 10,011  
Unrealized Losses Less than 12 months (102)  
Estimated Fair Value More than 12 months 2,436  
Unrealized Losses More than 12 months (42)  
Total Estimated Fair Value 12,447  
Total Unrealized Losses (144)  
Corporate Bonds    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Estimated Fair Value Less than 12 months 445  
Unrealized Losses Less than 12 months (1)  
Estimated Fair Value More than 12 months 1,984  
Unrealized Losses More than 12 months (6)  
Total Estimated Fair Value 2,429  
Total Unrealized Losses (7)  
Asset-Backed Securities    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Estimated Fair Value Less than 12 months 15,909  
Unrealized Losses Less than 12 months (18)  
Estimated Fair Value More than 12 months 0  
Unrealized Losses More than 12 months 0  
Total Estimated Fair Value 15,909  
Total Unrealized Losses $ (18)  
U.S. states, territories and possessions    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Estimated Fair Value Less than 12 months   9,169
Unrealized Losses Less than 12 months   (193)
Estimated Fair Value More than 12 months   502
Unrealized Losses More than 12 months   0
Total Estimated Fair Value   9,671
Total Unrealized Losses   (193)
Industrial and miscellaneous    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Estimated Fair Value Less than 12 months   69,745
Unrealized Losses Less than 12 months   (389)
Estimated Fair Value More than 12 months   3,417
Unrealized Losses More than 12 months   (40)
Total Estimated Fair Value   73,162
Total Unrealized Losses   (429)
Special Revenue    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Estimated Fair Value Less than 12 months   43,829
Unrealized Losses Less than 12 months   (604)
Estimated Fair Value More than 12 months   2,693
Unrealized Losses More than 12 months   (17)
Total Estimated Fair Value   46,522
Total Unrealized Losses   (621)
Political subdivisions    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Estimated Fair Value Less than 12 months   4,477
Unrealized Losses Less than 12 months   (151)
Estimated Fair Value More than 12 months   503
Unrealized Losses More than 12 months   (1)
Total Estimated Fair Value   4,980
Total Unrealized Losses   (152)
Hybrid securities    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Estimated Fair Value Less than 12 months   1,754
Unrealized Losses Less than 12 months   (1)
Estimated Fair Value More than 12 months   0
Unrealized Losses More than 12 months   0
Total Estimated Fair Value   1,754
Total Unrealized Losses   $ (1)