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Investments - Net Realized and Unrealized Investment Gains and Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net realized and unrealized investment gains and losses
Gains on sales of fixed maturity securities	$ 14	$ 466	$ 501
Gains on sales of equity securities		1,416	62
Total realized gains	14	1,882	563
Losses on sales of fixed maturity securities	(2,340)	(1)	(46)
Losses on sales of equity securities			(68)
Total realized losses	(2,340)	(1)	(114)
Net realized investment gains	(2,326)	1,881	449
Net unrealized gains (losses) on equity securities	(5,203)	(604)	1,039
Net realized and unrealized gains (losses) on investments	(7,529)	1,277	1,488
Proceeds from sales of fixed maturity securities
Proceeds from the sale of fixed maturity securities	$ 19,700	$ 17,400	$ 39,800

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