Reinsurance - Schedule of Premiums Written and Earned Along with Losses and Settlement Expenses Incurred (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
WRITTEN
Direct	$ 1,313,093	$ 1,107,303	$ 1,039,955
Reinsurance assumed	34,261	29,129	25,047
Reinsurance ceded	(289,821)	(244,344)	(204,665)
Net	1,057,533	892,088	860,337
EARNED
Direct	1,222,346	1,062,608	981,121
Reinsurance assumed	30,950	27,651	40,173
Reinsurance ceded	(272,393)	(224,512)	(182,183)
Net	980,903	865,747	839,111
LOSSES AND SETTLEMENT EXPENSES INCURRED
Direct	703,903	608,638	521,055
Reinsurance assumed	18,087	18,783	21,951
Reinsurance ceded	(265,388)	(184,537)	(129,590)
Net	$ 456,602	$ 442,884	$ 413,416