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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 |  |

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