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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%

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- Definition Amount of direct and assumed premiums written. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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