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Statutory Accounting and Regulation (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Insurance [Abstract]          
Statutory capital and surplus balance $ 209,205   $ 209,205   $ 166,113
Statutory Net Income [Line Items]          
Statutory net income (loss) 16,515 $ 40,605 41,139 $ 56,632  
Statutory capital and surplus balance 209,205   209,205   166,113
Statutory net income (loss) 16,515 40,605 41,139 56,632  
American Coastal Insurance Company          
Insurance [Abstract]          
Statutory capital and surplus balance 187,294   187,294   143,452
Statutory Net Income [Line Items]          
Statutory net income (loss) 17,011 40,883 41,940 59,113  
Statutory capital and surplus balance 187,294   187,294   143,452
Statutory net income (loss) 17,011 40,883 41,940 59,113  
Interboro Insurance          
Insurance [Abstract]          
Statutory capital and surplus balance 21,911   21,911   22,661
Statutory Net Income [Line Items]          
Statutory net income (loss) (496) (278) (801) (2,481)  
Statutory capital and surplus balance 21,911   21,911   $ 22,661
Statutory net income (loss) $ (496) $ (278) $ (801) $ (2,481)