Investments Net Investment Income (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Investment Income [Line Items]
Total investment income	$ 71,853	$ 68,020	$ 63,886
Investment expense	(2,599)	(2,594)	(2,391)
Net investment income	69,254	65,426	61,495
Debt Securities [Member]
Net Investment Income [Line Items]
Investment income	60,127	58,400	55,579
Equity Securities [Member]
Net Investment Income [Line Items]
Investment income	630	650	1,024
Policy Loans [Member]
Net Investment Income [Line Items]
Investment income	6,011	6,189	6,420
Other Long-term Investments [Member]
Net Investment Income [Line Items]
Investment income	4,509	2,535	809
Other [Member]
Net Investment Income [Line Items]
Investment income	$ 576	$ 246	$ 54

Total of all investment income before investment expenses

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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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Amount, after 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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