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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of the beginning and ending reserve balances for losses and loss adjustment expenses (LAE)            
Reserve for losses and LAE at beginning of period     $ 407,445 $ 374,941    
Less: Reinsurance recoverables $ 13,244 $ 26,970 13,244 26,970 $ 25,940 $ 19,061
Net reserve for losses and LAE at beginning of period     381,505 355,880    
Add provision for losses and LAE, net of reinsurance, occurring in:            
Current period     63,236 83,973    
Prior years     (242,041) (49,483)    
Net incurred losses and LAE during the current period 4,252 (7,483) (178,805) 34,490    
Deduct payments for losses and LAE, net of reinsurance, occurring in:            
Current period     111 231    
Prior years     3,339 4,153    
Net loss and LAE payments during the current period     3,450 4,384    
Net reserve for losses and LAE at end of period 199,250 385,986 199,250 385,986    
Plus: Reinsurance recoverables 13,244 26,970 13,244 26,970 $ 25,940 $ 19,061
Reserve for losses and LAE at end of period $ 212,494 $ 412,956 $ 212,494 $ 412,956