Statutory Accounting and Regulation (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Insurance [Abstract]
Statutory capital and surplus balance	$ 145,774		$ 145,774		$ 103,663
Statutory Net Income [Line Items]
Statutory net income (loss)	40,605	$ 5,966	56,632	$ 8,091
Statutory capital and surplus balance	145,774		145,774		103,663
Statutory net income (loss)	40,605	5,966	56,632	8,091
American Coastal Insurance Company
Insurance [Abstract]
Statutory capital and surplus balance	122,200		122,200		77,511
Statutory Net Income [Line Items]
Statutory net income (loss)	40,883	4,577	59,113	10,687
Statutory capital and surplus balance	122,200		122,200		77,511
Statutory net income (loss)	40,883	4,577	59,113	10,687
Interboro Insurance
Insurance [Abstract]
Statutory capital and surplus balance	23,574		23,574		26,152
Statutory Net Income [Line Items]
Statutory net income (loss)	(278)	1,389	(2,481)	(2,596)
Statutory capital and surplus balance	23,574		23,574		$ 26,152
Statutory net income (loss)	$ (278)	$ 1,389	$ (2,481)	$ (2,596)