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Nature of Operations and Basis of Presentation (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
May 13, 2025
USD ($)
shares
May 09, 2025
USD ($)
$ / shares
shares
May 08, 2025
shares
Dec. 31, 2025
USD ($)
$ / shares
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
May 07, 2025
$ / shares
shares
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Common stock, shares issued (in shares) | shares 417,470   12,904,495 19,579,009 [1] 12,904,495 [1] 12,904,495
Common stock, par value (in dollars per share) | $ / shares       $ 0.001 [1] $ 0.001 [1] $ 0.001
Exchange common units (in shares) | shares     122,900      
Number of shares issued in exchange for each share (in shares)     0.0095      
Price per share (in dollars per share) | $ / shares   $ 16.00        
Common stock sold by the company (in shares) | shares   6,250,000        
Common stock sold by certain selling shareholder (in shares) | shares   625,000        
Proceeds from initial public offering, net of underwriting discounts and commissions | $   $ 93,000   $ 93,000 $ 0  
Underwriter commission for initial public offers | $   $ 7,000        
Additional shares of Common Stock (in shares) | shares 1,031,250          
Proceeds from sale of shares | $ $ 16,500          
Withholding of common stock (in shares) | shares 234,587          
Stock-based compensation expense | $ $ 10,400     $ 10,609 $ 0  
Amount paid for tax withheld on vesting of restricted stock | $ $ 3,800          
IPO            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Common stock, shares subscribed but unissued (in shares) | shares   6,875,000        
Price per share (in dollars per share) | $ / shares   $ 16.00        
Proceeds from initial public offering, net of underwriting discounts and commissions | $   $ 100,000        
IPO | Selling Stockholders            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Proceeds from initial public offering, net of underwriting discounts and commissions | $   $ 10,000        
[1] Both the number of shares outstanding and their par value have been retrospectively recast for all prior periods presented to reflect
the par value of the outstanding stock of American Integrity Insurance Group, Inc. as a result of the Corporate Contribution. See
Note 1 — “Nature of Operations and Basis of Presentation” and Note 15 — “Earnings Per Share.”