Deferred Policy Acquisition Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of period	$ 41,968	$ 31,912
Policy acquisition costs deferred:
Direct commissions deferred	35,860	24,650
Ceding commissions deferred	(8,545)	(6,204)
Other underwriting and policy acquisition costs	1,988	1,368
Policy acquisition costs deferred	29,303	19,814
Amortization of net policy acquisition costs	(23,788)	(16,985)
Balance, end of period	$ 47,483	$ 34,741