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Reserve for Losses and Loss Adjustment Expenses - Reconciliation of Reserve Balances for Losses and Loss Adjustment Expense (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
Dec. 31, 2022
Reconciliation of the beginning and ending reserve balances for losses and loss adjustment expenses (LAE)            
Reserve for losses and LAE at beginning of period     $ 260,095 $ 216,464    
Less: Reinsurance recoverables $ 30,966 $ 20,755 30,966 20,755 $ 24,104 $ 14,618
Net reserve for losses and LAE at beginning of period     235,991 201,846    
Add provision for losses and LAE, net of reinsurance, occurring in:            
Current period     124,180 101,547    
Prior years     (83,935) (89,645)    
Net incurred losses and LAE during the current period 30,666 10,822 40,245 11,902    
Deduct payments for losses and LAE, net of reinsurance, occurring in:            
Current period     1,824 187    
Prior years     17,062 7,496    
Net loss and LAE payments during the current period     18,886 7,683    
Net reserve for losses and LAE at end of period 257,350 220,578 257,350 220,578    
Plus: Reinsurance recoverables 30,966 20,755 30,966 20,755 $ 24,104 $ 14,618
Reserve for losses and LAE at end of period $ 288,316 $ 241,333 $ 288,316 $ 241,333