Investments Net Investment Income (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net Investment Income [Line Items]
Total investment income	$ 63,886	$ 62,409	$ 61,360
Investment expense	(2,391)	(2,212)	(1,829)
Net investment income	61,495	60,197	59,531
Debt Securities [Member]
Net Investment Income [Line Items]
Investment income	55,579	54,653	53,860
Equity Securities [Member]
Net Investment Income [Line Items]
Investment income	1,024	816	662
Policy Loans [Member]
Net Investment Income [Line Items]
Investment income	6,420	6,605	6,451
Other Long-term Investments [Member]
Net Investment Income [Line Items]
Investment income	809	238	13
Other [Member]
Net Investment Income [Line Items]
Investment income	$ 54	$ 97	$ 374

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.

+ References

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Amount of expenses related to the generation of investment income.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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