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Fixed-Maturity Securities Available-For-Sale - Schedule of Estimated Fair Value of Investments in Fixed-Maturity Securities Available-for-Sale (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost $ 465,454 $ 464,585
Gross Unrealized Gains 9,332 2,553
Gross Unrealized Losses (183) (2,172)
Estimated Fair Value 474,603 464,966
U.S. government and agencies    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 145,066 166,641
Gross Unrealized Gains 1,941 418
Gross Unrealized Losses (14) (776)
Estimated Fair Value 146,993 166,283
States, municipalities and political subdivisions    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 166,703  
Gross Unrealized Gains 3,423  
Gross Unrealized Losses (144)  
Estimated Fair Value 169,982  
Corporate Bonds    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 129,982  
Gross Unrealized Gains 3,823  
Gross Unrealized Losses (7)  
Estimated Fair Value 133,798  
Asset-Backed Securities    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 23,703  
Gross Unrealized Gains 145  
Gross Unrealized Losses (18)  
Estimated Fair Value $ 23,830  
U.S. states, territories and possessions    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost   17,344
Gross Unrealized Gains   71
Gross Unrealized Losses   (193)
Estimated Fair Value   17,222
Industrial and miscellaneous    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost   149,104
Gross Unrealized Gains   1,350
Gross Unrealized Losses   (429)
Estimated Fair Value   150,025
Special Revenue    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost   106,681
Gross Unrealized Gains   527
Gross Unrealized Losses   (622)
Estimated Fair Value   106,586
Political subdivisions    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost   23,061
Gross Unrealized Gains   187
Gross Unrealized Losses   (151)
Estimated Fair Value   23,097
Hybrid securities    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost   1,754
Gross Unrealized Gains   0
Gross Unrealized Losses   (1)
Estimated Fair Value   $ 1,753