v3.26.1
Document & Entity Information
 6 Months Ended
Jun. 30, 2026
Document and Entity Information [Abstract]  
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 570 Carillon Parkway, Suite 100
Document Type 10-Q
Document Quarterly Report true
Amendment Flag false
Current Fiscal Year End Date --12-31
Document Fiscal Period Focus Q2
Document Fiscal Year Focus 2026
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
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 false
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 33716
Document Period End Date Jun. 30, 2026