Description of Business and Summary of Significant Accounting Policies - Effects of Reinsurance on Premium Written and Earned (Details) $ in Thousands	3 Months Ended
	Jun. 30, 2021 USD ($)
Description of Business and Summary of Significant Accounting Policies
Direct premiums, written	$ 81,132
Ceded premiums, written	(70,844)
Net premiums, written	10,288
Direct premiums, earned	62,352
Ceded premiums, earned	(59,077)
Net premiums, earned	$ 3,275