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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash dividends declared (in dollars per share) $ 1.33 $ 1.29 $ 1.20
Treasury stock issued for restricted stock awards (in shares) 61,484 36,166 4,250
Forfeitures of restricted stock awards (in shares) 34,841 63,667 87,208
Repurchase of S&T Stock (in shares)   739,426 268,503
Accounting Standards Update [Extensible List] Accounting Standards Update 2022-02 [Member] Accounting Standards Update 2022-02 [Member]