Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) Segment	Jun. 30, 2019 USD ($)
Segment Information [Abstract]
Number of reportable segments | Segment			1
Summary of Segment Revenue [Abstract]
Net premiums earned	$ 97,730	$ 115,631	$ 207,389	$ 225,644
Net investment income	6,379	6,500	13,616	12,732
Net realized and unrealized gains (losses) on investments	10,615	2,889	(17,141)	8,916
Commissions and other income	1,889	1,978	3,551	4,043
Total revenues	116,613	126,998	207,415	251,335
Property and Casualty Insurance [Member]
Summary of Segment Revenue [Abstract]
Net premiums earned	97,730	115,631	207,389	225,644
Net investment income	6,379	6,500	13,616	12,732
Net realized and unrealized gains (losses) on investments	10,615	2,889	(17,141)	8,916
Commissions and other income	1,889	1,978	3,551	4,043
Total revenues	$ 116,613	$ 126,998	$ 207,415	$ 251,335