v3.26.3
Reinsurance - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 06, 2020
Dec. 31, 2023
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2024
Ceded Credit Risk [Line Items]                    
Premiums receivable balance, credit provisions     $ 3,906 $ 2,204 $ 3,906 $ 2,204 $ 3,443 $ 3,664 $ 1,841 $ 2,993
Premiums receivable     1,209,434   1,209,434   939,777      
Paid losses recoverable     198,835   198,835   93,659      
Unpaid losses and loss adjustment expenses recoverable     1,468,584 1,303,833 1,468,584 1,303,833 1,375,857     1,171,040
Reinsurance recoverable, provisions     2,120 1,711 2,120 1,711 1,718 $ 1,403 $ 1,369 $ 1,469
Reinsurance premiums ceded     192,980 119,864 688,777 515,008        
Related Party                    
Ceded Credit Risk [Line Items]                    
Reinsurance premiums ceded     0 0 15,900 15,200        
Risk transfer capacity   $ 200,000                
Reinsurance Contract [Axis]: Loss Portfolio Transfer Agreement                    
Ceded Credit Risk [Line Items]                    
Unpaid losses and loss adjustment expenses recoverable     23,800   23,800   $ 22,700      
Reinsurance premiums ceded $ 72,100                  
Amortization of the deferred gain     $ 900 $ 100 $ 3,400 $ (2,500)        
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments | Reinsurer Concentration Risk                    
Ceded Credit Risk [Line Items]                    
% of total paid and unpaid losses and loss adjustment expenses recoverable         100.00%   100.00%      
Reinsurer One | Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments | Reinsurer Concentration Risk                    
Ceded Credit Risk [Line Items]                    
% of total paid and unpaid losses and loss adjustment expenses recoverable         22.00%   20.00%      
Reinsurer Two | Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments | Reinsurer Concentration Risk                    
Ceded Credit Risk [Line Items]                    
% of total paid and unpaid losses and loss adjustment expenses recoverable         15.00%   18.00%      
Reinsurer Three | Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments | Reinsurer Concentration Risk                    
Ceded Credit Risk [Line Items]                    
% of total paid and unpaid losses and loss adjustment expenses recoverable         11.00%   12.00%