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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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