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Document & Entity Information - shares
 3 Months Ended
Mar. 31, 2024
May 03, 2024
Document and Entity Information [Abstract]    
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One 800 2nd Avenue S.  
Document Type 10-Q  
Document Quarterly Report true  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2024  
Trading Symbol ACIC  
Title of 12(b) Security Common Stock, $0.0001 par value per share  
Security Exchange Name NASDAQ  
Registrant Name American Coastal Insurance Corporation  
City Area Code 727-  
Local Phone Number 633-0851  
Central Index Key 0001401521  
Filer Category Accelerated Filer  
Common Stock, Shares, Outstanding   47,828,491
Document Transition Report false  
Entity File Number 001-35761  
Entity Emerging Growth Company false  
Entity Interactive Data Current Yes  
Entity Shell Company false  
Entity Small Business true  
Entity Current Reporting Status Yes  
Entity Address, City or Town St. Petersburg,  
Entity Address, State or Province FL  
Entity Tax Identification Number 75-3241967  
Entity Address, Postal Zip Code 33701  
Document Period End Date Mar. 31, 2024