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Reinsurance (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Reinsurance Retention Policy    
Document Period End Date Mar. 31, 2025  
Ceded Premiums Earned $ 93,829 $ 97,639
Catastrophe Excess of Loss    
Reinsurance Retention Policy    
First Event Retention Level 20,500  
Subsequent Event Retention Level 13,000  
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  
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 176,400  
Event Retention Level 88,200  
American Coastal Insurance Company | Catastrophe Aggregate Excess of Loss    
Reinsurance Retention Policy    
Reinsurance, Excess Retention, Amount Reinsured, Per Policy 40,000  
Event Retention Level 20,000  
UPC Re | Catastrophe Excess of Loss    
Reinsurance Retention Policy    
First Event Retention Level 10,500  
Subsequent Event Retention Level $ 3,000  
Reinsurance Contract [Axis]: XOL Commutation    
Reinsurance Retention Policy    
Ceded Premiums Earned   $ 6,300