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Reinsurance - Schedule of Paid and Unpaid Losses and Loss Adjustment Expenses Recoverable (Details) - Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments - Reinsurer Concentration Risk
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Ceded Credit Risk [Line Items]    
% of total paid and unpaid losses and loss adjustment expenses recoverable 100.00% 100.00%
A- or better    
Ceded Credit Risk [Line Items]    
% of total paid and unpaid losses and loss adjustment expenses recoverable 70.60% 65.60%
Below A-    
Ceded Credit Risk [Line Items]    
% of total paid and unpaid losses and loss adjustment expenses recoverable 0.70% 0.60%
Collateralized    
Ceded Credit Risk [Line Items]    
% of total paid and unpaid losses and loss adjustment expenses recoverable 28.70% 33.80%