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Fair Value of Financial Instruments - Carrying Values and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale debt securities, at fair value |  | $ 3,147,647 | $ 2,946,126 |
Fixed-maturity security held to maturity, fair value |  | 1,217,961 | 1,227,428 |
Equity securities |  | 26,186 | 27,144 |
Separate account assets |  | 2,313,874 | 2,209,287 |
Surplus note |  | 1,241,263 | 1,303,556 |
Separate account liabilities |  | 2,313,874 | 2,209,287 | $ 2,395,842
Fixed-maturity security (held-to-maturity) |  | 1,241,540 | 1,303,880 |
Reported Value Measurement [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale debt securities, at fair value |  | 3,147,647 | 2,946,126 |
Equity securities |  | 26,186 | 27,144 |
Trading securities |  | 12,803 | 3,011 |
Separate account assets |  | 2,313,874 | 2,209,287 |
Separate account liabilities |  | 2,313,874 | 2,209,287 |
Reported Value Measurement [Member] | Level 3 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Policy loans | [1] | 45,159 | 40,884 |
Surplus note | [1],[2] | 1,241,263 | 1,303,556 |
Fixed-maturity security (held-to-maturity) | [1] | 1,241,540 | 1,303,880 |
Reported Value Measurement [Member] | Level 3 [Member] | Deposits [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Deposit asset underlying 10% coinsurance agreement | [1] | 138,908 | 158,913 |
Reported Value Measurement [Member] | Level 2 [Member] | Senior Notes [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Note payable - Long term | [2],[3] | 595,114 | 594,512 |
Estimate of Fair Value Measurement [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale debt securities, at fair value |  | 3,147,647 | 2,946,126 |
Equity securities |  | 26,186 | 27,144 |
Trading securities |  | 12,803 | 3,011 |
Separate account assets |  | 2,313,874 | 2,209,287 |
Separate account liabilities |  | 2,313,874 | 2,209,287 |
Estimate of Fair Value Measurement [Member] | Level 3 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fixed-maturity security held to maturity, fair value | [1] | 1,217,961 | 1,227,428 |
Policy loans | [1] | 45,159 | 40,884 |
Surplus note | [1],[2] | 1,215,284 | 1,225,708 |
Estimate of Fair Value Measurement [Member] | Level 3 [Member] | Deposits [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Deposit asset underlying 10% coinsurance agreement | [1] | 138,908 | 158,913 |
Estimate of Fair Value Measurement [Member] | Level 2 [Member] | Senior Notes [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Note payable - Long term | [2],[3] | $ 541,127 | $ 513,862 |
[1] | Classified as a Level 3 fair value measurement.
[2] | Carrying value amounts shown are net of unamortized issuance costs.
[3] | Classified as a Level 2 fair value measurement.

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