Loss and Loss Adjustment Expense Reserves (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loss and Loss Adjustment Expense Reserves
Reserves for losses and LAE at beginning of year	$ 584,719	$ 574,054	$ 560,321
Less receivable from reinsurers related to unpaid losses and LAE	(108,398)	(83,085)	(83,724)
Net reserves for losses and LAE at beginning of year	476,321	490,969	476,597
Incurred losses and LAE, related to:
Current year	551,895	542,001	545,671
Prior years	(42,049)	(56,488)	(41,784)
Total incurred losses and LAE	509,846	485,513	503,887
Paid losses and LAE related to:
Current year	333,377	340,927	325,049
Prior years	164,596	159,234	164,466
Total paid losses and LAE	497,973	500,161	489,515
Net reserves for losses and LAE at end of period	488,194	476,321	490,969
Plus receivable from reinsurers related to unpaid losses and LAE	122,372	108,398	83,085
Reserves for losses and LAE at end of period	610,566	584,719	574,054
Prior years	42,049	56,488	41,784
Reduction in retained automobile reserves	25,623	36,266	29,855
Reduction in retained homeowners reserves	$ 14,182	$ 18,947	$ 10,201