Investments - Net Realized and Unrealized Investment Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net realized and unrealized investment gains and losses
Gains on sales of fixed maturity securities	$ 175	$ 53	$ 185	$ 97
Gains on sales of equity securities				67
Total realized gains	175	53	185	164
Losses on sales of fixed maturity securities	(44)	(3)	(44)	(69)
Losses on sales of equity securities	(2)		(2)	(156)
Total realized losses	(46)	(3)	(46)	(225)
Net realized investment gains (losses)	129	50	139	(61)
Net unrealized gains on equity securities	649	443	1,080	2,965
Net realized and unrealized gains on investments	778	493	1,219	2,904
Proceeds from sales of fixed maturity securities
Proceeds from the sale of fixed maturity securities	$ 10,500	$ 4,400	$ 12,900	$ 14,300