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Reinsurance - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]              
Ceded Losses and LAE Incurred         $ 158,141 $ 77,203 $ 666,964
Ceded Premiums Earned         364,618 342,623 $ 251,259
Reinsurance Contract [Axis]: XOL Commutation              
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]              
Ceded Premiums Earned $ (6,300)   $ (15,700)     $ 6,300  
Catastrophe Excess of Loss              
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]              
First Event Retention Level   $ 20,500     20,500    
Subsequent Event Retention Level   13,000     13,000    
Interboro Insurance | Catastrophe Excess of Loss              
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]              
Reinsurance, Excess Retention, Amount Reinsured, Per Policy   82,500          
Event Retention Level   2,500     2,500    
American Coastal Insurance Company | Catastrophe Excess of Loss              
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]              
Reinsurance, Excess Retention, Amount Reinsured, Per Policy   1,610,000          
Event Retention Level   10,000     10,000    
Reinsurance Retention Policy, Excess Retention, Amount Reinsured         1,260,000    
American Coastal Insurance Company | All Other Perilds Catastrophe Excess of Loss              
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]              
Reinsurance, Excess Retention, Amount Reinsured, Per Policy         172,000    
UPC Re | Catastrophe Excess of Loss              
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]              
First Event Retention Level   10,500     10,500    
Subsequent Event Retention Level   $ 3,000     $ 3,000    
Subsequent Event | Interboro Insurance | Catastrophe Excess of Loss              
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]              
Event Retention Level       $ 9,800      
Subsequent Event | American Coastal Insurance Company | All Other Perilds Catastrophe Excess of Loss              
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]              
Reinsurance, Excess Retention, Amount Reinsured, Per Policy       176,400      
Reinsurance Retention Policy, Excess Retention, Amount Reinsured       $ 90,000