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Reinsurance (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Reinsurance Retention Policy              
Document Period End Date         Sep. 30, 2024    
Ceded premiums earned $ (85,692)   $ (107,513)   $ (275,400) $ (232,670)  
Catastrophe Excess of Loss              
Reinsurance Retention Policy              
First Event Retention Level 20,500       20,500    
Subsequent Event Retention Level 13,000       13,000    
Interboro Insurance | Catastrophe Excess of Loss              
Reinsurance Retention Policy              
Reinsurance, Excess Retention, Amount Reinsured, Per Policy 82,500            
Event Retention Level 2,500       2,500    
American Coastal Insurance Company | Catastrophe Excess of Loss              
Reinsurance Retention Policy              
Reinsurance, Excess Retention, Amount Reinsured, Per Policy 1,610,000            
Event Retention Level 10,000       10,000    
Reinsurance, Excess Retention, Amount Reinsured, Per Event         1,260,000    
American Coastal Insurance Company | All Other Perilds Catastrophe Excess of Loss              
Reinsurance Retention Policy              
Reinsurance, Excess Retention, Amount Reinsured, Per Policy         172,000    
UPC Re | Catastrophe Excess of Loss              
Reinsurance Retention Policy              
First Event Retention Level 10,500       10,500    
Subsequent Event Retention Level $ 3,000       $ 3,000    
Reinsurance Contract [Axis]: XOL Commutation              
Reinsurance Retention Policy              
Ceded premiums earned   $ 6,300   $ 15,700     $ (6,300)