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Reinsurance - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Ceded Losses and LAE Incurred $ 76,843,000 $ 666,949,000 $ 26,904,000
Ceded Premiums Earned 354,080,000 $ 266,023,000 $ 244,630,000
Ian Remaining Limit 508    
Reinstatement Premium - 2022/2023 CAT XOL 15.4    
2022-2023 CAT XOL Remaining Limit 980    
Reinsurance Contract [Axis]: XOL Commutation      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Ceded Premiums Earned 6,300,000    
American Coastal Insurance Company      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Event Retention Level 10,000,000    
American Coastal Insurance Company | Catastrophe Excess of Loss      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Reinsurance, Excess Retention, Amount Reinsured, Per Policy 1,300,000,000    
Reinsurance Retention Excess Retention Amount Reinsured Per Loss Event 1,100,000,000    
American Coastal Insurance Company | All Other Perils Catastrophe Excess of Loss      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Reinsurance, Excess Retention, Amount Reinsured, Per Policy 101,000,000    
Interboro Insurance Company      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Event Retention Level 3,000,000    
Interboro Insurance Company | Catastrophe Excess of Loss      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Reinsurance, Excess Retention, Amount Reinsured, Per Policy 82,000,000    
UPC Re      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Event Retention Level $ 2,250,000