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Premiums and Reinsurance Related Information - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Effects of Reinsurance [Line Items]          
Ceded written premiums $ 68,643 $ 49,581 $ 179,710 $ 121,639  
Ceded premiums earned 56,503 35,388 150,309 90,901  
Ceded losses and loss adjustment expenses 34,981 20,835 90,849 52,357  
Reinsurance recoverable 225,011   225,011   $ 139,389
Related Party          
Effects of Reinsurance [Line Items]          
Ceded written premiums 8,300 5,200 20,200 12,500  
Ceded premiums earned 6,000 2,700 15,400 5,300  
Ceded losses and loss adjustment expenses 3,600 $ 1,500 9,300 $ 3,000  
Reinsurance recoverable $ 15,100   $ 15,100   $ 5,900