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Investments - Net Investment Income (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Net Investment Income [Line Items]
Gross investment income, operating		$ 58,943	$ 59,123	$ 175,019	$ 171,033
Investment expenses		(2,036)	(2,106)	(6,223)	(6,314)
Investment income net of investment expenses		56,907	57,017	168,796	164,719
Interest expense on surplus note		(14,476)	(15,908)	(43,766)	(47,352)
Net investment income		42,431	41,109	125,030	117,367
Equity Securities [Member]
Net Investment Income [Line Items]
Gross investment income, operating		318	324	947	1,036
Policy Loans and Other Invested Assets [Member]
Net Investment Income [Line Items]
Gross investment income, operating		611	402	2,125	1,407
Cash, Cash Equivalents and Short-Term Investments [Member]
Net Investment Income [Line Items]
Gross investment income, operating		6,340	6,540	18,818	20,161
Total return on deposit asset underlying 10% insurance agreement [Member]
Net Investment Income [Line Items]
Gross investment income, operating	[1]	1,980	3,959	6,286	8,534
Available-for-Sale [Member] | Fixed Maturities
Net Investment Income [Line Items]
Gross investment income, operating		35,218	31,990	103,077	92,543
Held-to-Maturity [Member] | Fixed Maturities
Net Investment Income [Line Items]
Gross investment income, operating		$ 14,476	$ 15,908	$ 43,766	$ 47,352
[1] Includes $0.3 million and $1.0 million of net gains (losses) recognized for the change in fair value of the deposit asset underlying the 10% coinsurance agreement for the three and nine months ended September 30, 2025, respectively. Includes $1.8 million and $1.9 million of net gains (losses) recognized for the change in fair value of the deposit asset underlying the 10% coinsurance agreement for the three and nine months ended September 30, 2024, respectively.

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Amount, before investment expense, of income earned or loss recognized from investments in securities. Includes, but is not limited to, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

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Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

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