Underwriting Information - Gross Written Premiums by State (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Gross written premiums
Amount	$ 218,689	$ 129,359	$ 389,623	$ 232,936
% of GWP	100.00%	100.00%	100.00%	100.00%
California
Gross written premiums
Amount	$ 93,130	$ 54,223	$ 161,848	$ 104,725
% of GWP	42.60%	41.90%	41.50%	45.00%
Texas
Gross written premiums
Amount	$ 26,286	$ 17,373	$ 45,265	$ 28,427
% of GWP	12.00%	13.40%	11.60%	12.20%
Florida
Gross written premiums
Amount	$ 14,809	$ 11,697	$ 19,771	$ 17,755
% of GWP	6.80%	9.00%	5.10%	7.60%
Hawaii
Gross written premiums
Amount	$ 10,191	$ 9,041	$ 18,731	$ 15,970
% of GWP	4.70%	7.00%	4.80%	6.90%
Washington
Gross written premiums
Amount	$ 8,937	$ 4,663	$ 15,818	$ 8,751
% of GWP	4.10%	3.60%	4.10%	3.80%
Illinois
Gross written premiums
Amount	$ 4,676	$ 3,173	$ 8,949	$ 5,775
% of GWP	2.10%	2.50%	2.30%	2.40%
Oregon
Gross written premiums
Amount	$ 4,371	$ 2,818	$ 8,745	$ 5,723
% of GWP	2.00%	2.20%	2.20%	2.40%
North Carolina
Gross written premiums
Amount	$ 3,700	$ 4,264	$ 7,778	$ 8,152
% of GWP	1.70%	3.30%	2.00%	3.50%
Other States
Gross written premiums
Amount	$ 52,589	$ 22,107	$ 102,718	$ 37,658
% of GWP	24.00%	17.10%	26.40%	16.20%