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Statutory Accounting and Regulation (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Insurance [Abstract]          
Statutory capital and surplus balance $ 153,123   $ 153,123   $ 103,663
Statutory Net Income [Line Items]          
Statutory net income (loss) 17,859 $ 12,481 74,491 $ 20,571  
Statutory capital and surplus balance 153,123   153,123   103,663
Statutory net income (loss) 17,859 12,481 74,491 20,571  
American Coastal Insurance Company          
Insurance [Abstract]          
Statutory capital and surplus balance 130,268   130,268   77,511
Statutory Net Income [Line Items]          
Statutory net income (loss) 18,668 14,314 77,781 25,000  
Statutory capital and surplus balance 130,268   130,268   77,511
Statutory net income (loss) 18,668 14,314 77,781 25,000  
Interboro Insurance          
Insurance [Abstract]          
Statutory capital and surplus balance 22,855   22,855   26,152
Statutory Net Income [Line Items]          
Statutory net income (loss) (809) (1,833) (3,290) (4,429)  
Statutory capital and surplus balance 22,855   22,855   $ 26,152
Statutory net income (loss) $ (809) $ (1,833) $ (3,290) $ (4,429)