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Underwriting Information - Gross Written Premiums by Product (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Gross written premiums      
Amount $ 881,868 $ 535,175 $ 354,360
% of GWP 100.00% 100.00% 100.00%
Fronting premium      
Gross written premiums      
Amount $ 223,249 $ 11,459  
% of GWP 25.30% 2.20%  
Residential Earthquake      
Gross written premiums      
Amount $ 213,803 $ 171,048 $ 140,934
% of GWP 24.20% 32.00% 39.80%
Commercial Earthquake      
Gross written premiums      
Amount $ 131,677 $ 90,552 $ 58,890
% of GWP 14.90% 16.90% 16.60%
Inland Marine      
Gross written premiums      
Amount $ 105,068 $ 57,124 $ 15,423
% of GWP 11.90% 10.70% 4.30%
Commercial All Risk      
Gross written premiums      
Amount $ 51,671 $ 38,640 $ 53,933
% of GWP 5.90% 7.20% 15.20%
Casualty      
Gross written premiums      
Amount $ 35,791 $ 9,584  
% of GWP 4.10% 1.90%  
Hawaii Hurricane      
Gross written premiums      
Amount $ 32,967 $ 30,298 $ 13,824
% of GWP 3.70% 5.60% 3.90%
Specialty Homeowners      
Gross written premiums      
Amount $ 29,959 $ 67,894 $ 49,849
% of GWP 3.40% 12.70% 14.10%
Residential Flood      
Gross written premiums      
Amount $ 14,539 $ 11,652 $ 8,176
% of GWP 1.70% 2.20% 2.30%
Others      
Gross written premiums      
Amount $ 43,144 $ 46,924 $ 13,331
% of GWP 4.90% 8.60% 3.80%