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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, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net Investment Income [Line Items]
Total investment income									$ 28,424	$ 15,556	$ 23,546
Less: Investment expenses									(2,639)	(3,021)	(3,153)
Net investment income	$ 10,448	$ 6,074	$ 5,221	$ 4,042	$ 3,894	$ 2,797	$ 2,858	$ 2,986	25,785	12,535	20,393
Available-for-sale debt securities
Net Investment Income [Line Items]
Investment income									18,699	11,926	19,091
Equity securities
Net Investment Income [Line Items]
Investment income									3,288	2,651	2,445
Cash and Cash Equivalents
Net Investment Income [Line Items]
Investment income									5,945	51	960
Other
Net Investment Income [Line Items]
Investment income									$ 492	$ 928	$ 1,050

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.2)
-URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

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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.

+ References

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-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
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Amount of expenses related to the generation of investment income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
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