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Reinsurance (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Reinsurance Retention Policy          
Document Period End Date       Jun. 30, 2024  
Ceded premiums earned $ (92,069)   $ (71,823) $ (189,708) $ (125,157)
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          
Event Retention Level 10,000     10,000  
Reinsurance, Excess Retention, Amount Reinsured, Per Event       1,160,000  
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) $ 6,300   $ (15,700)