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Fair Value of Financial Instruments - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Total available-for-sale fixed-maturity securities $ 3,147,647 $ 2,946,126  
Equity securities 26,186 27,144  
Cash and cash equivalents 644,855 687,821  
Separate account assets 2,313,874 2,209,287  
Separate account liabilities 2,313,874 2,209,287 $ 2,395,842
Fair Value, Recurring Measurements [Member]      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Total available-for-sale fixed-maturity securities 3,147,647 2,946,126  
Equity securities 26,186 27,144  
Trading securities 12,803 3,011  
Cash and cash equivalents 644,855 687,821  
Separate account assets 2,313,874 2,209,287  
Assets, fair value disclosure 6,145,365 5,873,389  
Separate account liabilities 2,313,874 2,209,287  
Liabilities, fair value disclosure 2,313,874 2,209,287  
Fair Value, Recurring Measurements [Member] | Level 1 [Member]      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Total available-for-sale fixed-maturity securities 3,845 3,787  
Equity securities 26,186 24,598  
Cash and cash equivalents 644,855 687,821  
Assets, fair value disclosure 674,886 716,206  
Fair Value, Recurring Measurements [Member] | Level 2 [Member]      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Total available-for-sale fixed-maturity securities 3,140,802 2,942,339  
Equity securities   1,003  
Trading securities 12,803 3,011  
Separate account assets 2,313,874 2,209,287  
Assets, fair value disclosure 5,467,479 5,155,640  
Separate account liabilities 2,313,874 2,209,287  
Liabilities, fair value disclosure 2,313,874 2,209,287  
Fair Value, Recurring Measurements [Member] | Level 3 [Member]      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Total available-for-sale fixed-maturity securities 3,000    
Equity securities   1,543  
Assets, fair value disclosure 3,000 1,543  
Fair Value, Recurring Measurements [Member] | U.S. Government and Agencies [Member]      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Total available-for-sale fixed-maturity securities 9,710 9,503  
Fair Value, Recurring Measurements [Member] | U.S. Government and Agencies [Member] | Level 2 [Member]      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Total available-for-sale fixed-maturity securities 9,710 9,503  
Fair Value, Recurring Measurements [Member] | Foreign Government [Member]      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Total available-for-sale fixed-maturity securities 172,966 166,424  
Fair Value, Recurring Measurements [Member] | Foreign Government [Member] | Level 2 [Member]      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Total available-for-sale fixed-maturity securities 172,966 166,424  
Fair Value, Recurring Measurements [Member] | States and Political Subdivisions [Member]      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Total available-for-sale fixed-maturity securities 126,707 113,569  
Fair Value, Recurring Measurements [Member] | States and Political Subdivisions [Member] | Level 2 [Member]      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Total available-for-sale fixed-maturity securities 126,707 113,569  
Fair Value, Recurring Measurements [Member] | Corporates [Member]      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Total available-for-sale fixed-maturity securities 1,949,069 1,825,108  
Fair Value, Recurring Measurements [Member] | Corporates [Member] | Level 1 [Member]      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Total available-for-sale fixed-maturity securities 3,845 3,787  
Fair Value, Recurring Measurements [Member] | Corporates [Member] | Level 2 [Member]      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Total available-for-sale fixed-maturity securities 1,945,224 1,821,321  
Fair Value, Recurring Measurements [Member] | Residential Mortgage-backed Securities [Member]      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Total available-for-sale fixed-maturity securities 608,317 486,557  
Fair Value, Recurring Measurements [Member] | Residential Mortgage-backed Securities [Member] | Level 2 [Member]      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Total available-for-sale fixed-maturity securities 608,317 486,557  
Fair Value, Recurring Measurements [Member] | Commercial Mortgage-backed Securities [Member]      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Total available-for-sale fixed-maturity securities 86,938 99,445  
Fair Value, Recurring Measurements [Member] | Commercial Mortgage-backed Securities [Member] | Level 2 [Member]      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Total available-for-sale fixed-maturity securities 86,938 99,445  
Fair Value, Recurring Measurements [Member] | Other Asset-backed Securities [Member]      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Total available-for-sale fixed-maturity securities 193,940 245,520  
Fair Value, Recurring Measurements [Member] | Other Asset-backed Securities [Member] | Level 2 [Member]      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Total available-for-sale fixed-maturity securities 190,940 $ 245,520  
Fair Value, Recurring Measurements [Member] | Other Asset-backed Securities [Member] | Level 3 [Member]      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Total available-for-sale fixed-maturity securities $ 3,000