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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of the beginning and ending reserve balances for losses and loss adjustment expenses (LAE)            
Reserve for losses and LAE at beginning of period     $ 216,464 $ 407,445    
Less: Reinsurance recoverables $ 20,755 $ 13,244 20,755 13,244 $ 14,618 $ 25,940
Net reserve for losses and LAE at beginning of period     201,846 381,505    
Net reserves acquired during the period     14,513 0    
Add provision for losses and LAE, net of reinsurance, occurring in:            
Current period     101,547 63,236    
Prior years     (89,645) (242,041)    
Net incurred losses and LAE during the current period 10,822 4,252 11,902 (178,805)    
Deduct payments for losses and LAE, net of reinsurance, occurring in:            
Current period     187 111    
Prior years     7,496 3,339    
Net loss and LAE payments during the current period     7,683 3,450    
Net reserve for losses and LAE at end of period 220,578 199,250 220,578 199,250    
Plus: Reinsurance recoverables 20,755 13,244 20,755 13,244 $ 14,618 $ 25,940
Reserve for losses and LAE at end of period $ 241,333 $ 212,494 $ 241,333 $ 212,494