Segment Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) Segment	Mar. 31, 2020 USD ($)
Segment Information [Abstract]
Number of reportable segments | Segment	1
Summary of Segment Revenue [Abstract]
Net premiums earned	$ 122,853	$ 109,659
Net investment income	5,306	7,236
Net realized and unrealized gains (losses) on investments	10,509	(27,756)
Commissions and other income	1,858	1,663
Total revenues	140,526	90,802
Property and Casualty Insurance [Member]
Summary of Segment Revenue [Abstract]
Net premiums earned	122,853	109,659
Net investment income	5,306	7,236
Net realized and unrealized gains (losses) on investments	10,509	(27,756)
Commissions and other income	1,858	1,663
Total revenues	$ 140,526	$ 90,802