Reinsurance, Effects of Reinsurance on Premiums Written and Earned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Written [Abstract]
Direct	$ 389,569	$ 275,538	$ 223,191
Assumed	125	0	0
Ceded	(47,633)	(39,924)	(33,719)
Net written premiums	342,061	235,614	189,472
Earned [Abstract]
Direct	330,464	250,397	209,426
Assumed	104	0	0
Ceded	(47,587)	(37,709)	(33,373)
Net earned premiums	282,981	212,688	176,053
Ceded incurred losses and loss adjustment expenses	$ 27,200	$ 25,500	$ 12,200