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Investments - Investment Income (Expense) Comprised Primarily of Interest and Dividends (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net Investment Income [Line Items]
Total investment income									$ 23,546	$ 33,821	$ 27,776
Less: Investment expenses									(3,153)	(3,078)	(2,960)
Net investment income	$ 2,823	$ 4,557	$ 6,179	$ 6,834	$ 7,578	$ 7,613	$ 7,410	$ 8,142	20,393	30,743	24,816
Debt Securities [Member]
Net Investment Income [Line Items]
Investment income									19,091	24,989	18,198
Equity Securities [Member]
Net Investment Income [Line Items]
Investment income									2,445	2,648	2,978
Short-term investments [Member]
Net Investment Income [Line Items]
Investment income									0	0	145
Cash and Cash Equivalents [Member]
Net Investment Income [Line Items]
Investment income									960	5,176	5,540
Other [Member]
Net Investment Income [Line Items]
Investment income									$ 1,050	$ 1,008	$ 915

X

- Definition

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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.2)
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Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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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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