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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Cash dividends declared (in dollars per share) $ 0.33 $ 0.32 $ 0.99 $ 0.96
Treasury stock issued for restricted stock awards (in shares)   3,795 61,154 35,836
Forfeitures of restricted stock awards (in shares)     34,230 51,834
Repurchase of S&T Stock (in shares)       739,426
Accounting Standards Update [Extensible List]     Accounting Standards Update 2022-02 [Member] Accounting Standards Update 2022-02 [Member]
Treasury Stock        
Treasury stock issued for restricted stock awards (in shares) 5,401      
Forfeitures of restricted stock awards (in shares) 1,875 1,404