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Related Party Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Related Party Transaction [Line Items]        
Ceded written premiums $ 68,643 $ 49,581 $ 179,710 $ 121,639
Related Party        
Related Party Transaction [Line Items]        
Ceded written premiums 8,300 5,200 $ 20,200 12,500
Related Party | BIHL        
Related Party Transaction [Line Items]        
Limited liability company or limited partnership, members or limited partners, ownership interest     0.20%  
Related Party | Ceding Fees        
Related Party Transaction [Line Items]        
Related party transaction, amounts of transaction $ 2,400 1,600 $ 6,200 4,100
Related Party | AmFam        
Related Party Transaction [Line Items]        
Quota share agreement, percentage 100.00%   100.00%  
Related Party | BIHL        
Related Party Transaction [Line Items]        
Capital contribution from parent, accumulated contributions     $ 316,300  
Capital contribution from parent, contributed amount $ 0 22,300 4,500 53,600
Related Party | AmFam        
Related Party Transaction [Line Items]        
Ceded written premiums $ 8,300 $ 5,200 $ 20,200 $ 12,500