v3.26.1
Summary of Significant Accounting Policies (Details) - EBP 002 - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
EBP, Accounting Policy [Line Items]    
Administrative expense $ 118,700  
Investments, at fair value: 585,743,136 $ 520,560,705
F.N.B. Corporation Common Stock Fund    
EBP, Accounting Policy [Line Items]    
Investments, at fair value: $ 117,175,933 $ 119,355,214