Loss and Loss Adjustment Expense Reserves (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reserves for losses and LAE at beginning of year	$ 567,581	$ 610,566	$ 584,719
Less receivable from reinsurers related to unpaid losses and LAE	(106,311)	(122,372)	(108,398)
Net reserves for losses and LAE at beginning of year	461,270	488,194	476,321
Incurred losses and LAE, related to:
Current year	515,400	459,400	551,895
Prior years	(53,673)	(54,844)	(42,049)
Total incurred losses and LAE	461,727	404,556	509,846
Paid losses and LAE related to:
Current year	310,116	277,754	333,377
Prior years	132,897	153,726	164,596
Total paid losses and LAE	443,013	431,480	497,973
Net reserves for losses and LAE at end of period	479,984	461,270	488,194
Plus receivable from reinsurers related to unpaid losses and LAE	90,667	106,311	122,372
Reserves for losses and LAE at end of period	570,651	567,581	610,566
Reduction in retained automobile reserves	26,220	26,902	25,623
Reduction in retained homeowners reserves	22,313	$ 21,717	$ 14,182
Private Passenger Automobile Liability
Paid losses and LAE related to:
Plus receivable from reinsurers related to unpaid losses and LAE	120
Private Passenger Automobile Physical Damage
Paid losses and LAE related to:
Plus receivable from reinsurers related to unpaid losses and LAE	0
Commercial Automobile Liability
Paid losses and LAE related to:
Plus receivable from reinsurers related to unpaid losses and LAE	87,221
Commercial Automobile Physical Damage
Paid losses and LAE related to:
Plus receivable from reinsurers related to unpaid losses and LAE	2,398
Other short-Duration Insurance Lines
Paid losses and LAE related to:
Plus receivable from reinsurers related to unpaid losses and LAE	$ 928