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Subsequent Events - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Subsequent Event                              
Common Stock, Dividends, Per Share, Declared $ 0.50 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0.06      
Dividend paid to Parent Company $ 14,300               $ 26,000       $ 14,300   $ 14,300
Catastrophe Excess of Loss                              
Subsequent Event                              
First Event Retention Level 20,500                       20,500   20,500
Subsequent Event Retention Level 13,000                       13,000   13,000
American Coastal Insurance Company | All Other Perilds Catastrophe Excess of Loss                              
Subsequent Event                              
Reinsurance, Excess Retention, Amount Reinsured, Per Policy                             172,000
American Coastal Insurance Company | Catastrophe Excess of Loss                              
Subsequent Event                              
Reinsurance, Excess Retention, Amount Reinsured, Per Policy                         1,610,000    
Event Retention Level 10,000                       10,000   10,000
Reinsurance Retention Policy, Excess Retention, Amount Reinsured                             1,260,000
American Coastal Insurance Company | All Other Perils Catastrophe Excess of Loss                              
Subsequent Event                              
Reinsurance, Amount Retained, Per Policy                             14,000
Change In Reinsurance Retention Amount Retained, Per Policy 4,000                       4,000   4,000
Interboro Insurance | Catastrophe Excess of Loss                              
Subsequent Event                              
Reinsurance, Excess Retention, Amount Reinsured, Per Policy                         82,500    
Event Retention Level $ 2,500                       $ 2,500   $ 2,500
Subsequent Event | Catastrophe Excess of Loss                              
Subsequent Event                              
First Event Coverage                           $ 88,200  
Second Event Coverage                           88,200  
Subsequent Event | American Coastal Insurance Company | All Other Perilds Catastrophe Excess of Loss                              
Subsequent Event                              
Reinsurance, Excess Retention, Amount Reinsured, Per Policy                           176,400  
Change in Reinsurance, Excess Retention, Amount Reinsured, Per Policy                           4,400  
Payments for Reinsurance                           11,900  
Reinsurance Retention Policy, Excess Retention, Amount Reinsured                           90,000  
Subsequent Event | American Coastal Insurance Company | Catastrophe Aggregate Excess of Loss                              
Subsequent Event                              
Reinsurance, Excess Retention, Amount Reinsured, Per Policy                           40,000  
Payments for Reinsurance                           6,600  
Reinsurance, Amount Retained, Per Policy                           40,000  
Subsequent Event | American Coastal Insurance Company | All Other Perils Catastrophe Excess of Loss                              
Subsequent Event                              
Reinsurance, Amount Retained, Per Policy                           10,000  
Subsequent Event | Interboro Insurance | Catastrophe Aggregate Excess of Loss                              
Subsequent Event                              
Reinsurance Retention Policy, Excess Retention, Amount Reinsured                           20,000  
Subsequent Event | Interboro Insurance | Catastrophe Excess of Loss                              
Subsequent Event                              
Event Retention Level                           $ 9,800