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Statutory Accounting and Regulation (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Insurance [Abstract]          
Statutory capital and surplus balance $ 166,906   $ 166,906   $ 341,630
Statutory Net Income [Line Items]          
Statutory net income (loss) (29,776) $ (5,914) (148,519) $ (104,684)  
Statutory capital and surplus balance 166,906   166,906   341,630
Statutory net income (loss) (29,776) (5,914) (148,519) (104,684)  
UPC Insurance          
Insurance [Abstract]          
Statutory capital and surplus balance 50,880   50,880   169,244
Statutory Net Income [Line Items]          
Statutory net income (loss) (42,257) 1,607 (169,090) (59,314)  
Statutory capital and surplus balance 50,880   50,880   169,244
Statutory net income (loss) (42,257) 1,607 (169,090) (59,314)  
American Coastal Insurance Company          
Insurance [Abstract]          
Statutory capital and surplus balance 90,604   90,604   142,138
Statutory Net Income [Line Items]          
Statutory net income (loss) 14,314 (3,484) 25,000 (39,882)  
Statutory capital and surplus balance 90,604   90,604   142,138
Statutory net income (loss) 14,314 (3,484) 25,000 (39,882)  
Interboro Insurance          
Insurance [Abstract]          
Statutory capital and surplus balance 25,422   25,422   30,248
Statutory Net Income [Line Items]          
Statutory net income (loss) (1,833) (4,037) (4,429) (5,488)  
Statutory capital and surplus balance 25,422   25,422   $ 30,248
Statutory net income (loss) $ (1,833) $ (4,037) $ (4,429) $ (5,488)