v3.26.1
Cover Page - shares
 6 Months Ended
Jun. 30, 2026
Aug. 13, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Entity File Number 001-42634  
Entity Registrant Name American Integrity Insurance Group, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 33-2925846  
Entity Address, Address Line One 3000 Bayport Drive  
Entity Address, Address Line Two Suite 500  
Entity Address, City or Town Tampa  
Entity Address, State or Province FL  
Entity Address, Postal Zip Code 33607  
City Area Code (813)  
Local Phone Number 880-7000  
Title of 12(b) Security Common Stock, $0.001 par value  
Trading Symbol AII  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   19,593,427
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Entity Central Index Key 0002007587