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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
Mar. 31, 2024
Mar. 31, 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 26,670 16,357 $ 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 39,396 32,694    
Prior years (29,483) (32,874)    
Net incurred losses and LAE during the current period 9,913 (180)    
Deduct payments for losses and LAE, net of reinsurance, occurring in:        
Current period 404 0    
Prior years 4,846 2,001    
Net loss and LAE payments during the current period 5,250 2,001    
Net reserve for losses and LAE at end of period 240,654 199,665    
Plus: Reinsurance recoverables 26,670 16,357 $ 24,104 $ 14,618
Reserve for losses and LAE at end of period $ 267,324 $ 216,022