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Document & Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2025
Mar. 02, 2026
Jun. 30, 2025
Document and Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2025    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2025    
Central Index Key 0001401521    
Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Interactive Data Current Yes    
Entity Shell Company false    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Public Float     $ 277,582,000
Current Fiscal Year End Date --12-31    
Document Annual Report true    
Document Transition Report false    
Entity File Number 001-35761    
Registrant Name American Coastal Insurance Corporation    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 75-3241967    
Entity Address, Address Line One 570 Carillon Parkway, Suite 100    
Entity Address, Postal Zip Code 33716    
Entity Address, State or Province FL    
Entity Address, City or Town St. Petersburg    
City Area Code 727    
Local Phone Number 633-0851    
Title of 12(b) Security Common Stock, $0.0001 par value per share    
Trading Symbol ACIC    
Security Exchange Name NASDAQ    
ICFR Auditor Attestation Flag true    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Part III of this Form 10-K incorporates by reference certain information from the Proxy Statement for the 2025 Annual Meeting of Stockholders to be filed with the Securities and Exchange Commission within 120 days after the end of our fiscal year ended December 31, 2025.

    
Entity Common Stock, Shares Outstanding   48,656,205  
Auditor Firm ID 34    
Auditor Name DELOITTE & TOUCHE LLP    
Auditor Location Tampa, Florida    
Document Financial Statement Error Correction [Flag] false