Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) Segment	Sep. 30, 2018 USD ($)
Segment Information [Abstract]
Number of reportable segments | Segment			1
Summary of Segment Revenue [Abstract]
Net premiums earned	$ 110,288	$ 96,807	$ 335,931	$ 314,209
Net investment income	6,703	5,578	19,434	16,010
Net realized and unrealized gains (losses) on investments	125	2,373	9,041	(5,595)
Commissions and other income	2,716	3,413	6,761	7,488
Total revenues	119,832	108,171	371,167	332,112
Property and Casualty Insurance [Member]
Summary of Segment Revenue [Abstract]
Net premiums earned	110,288	96,807	335,931	314,209
Net investment income	6,703	5,578	19,434	16,010
Net realized and unrealized gains (losses) on investments	125	2,373	9,041	(5,595)
Commissions and other income	2,716	3,413	6,761	7,488
Total revenues	$ 119,832	$ 108,171	$ 371,167	$ 332,112