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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Cash dividends declared (in dollars per share) $ 0.33 $ 0.32 $ 0.66 $ 0.64
Treasury stock issued for restricted stock awards (in shares)   32,041 55,753 32,041
Forfeitures of restricted stock awards (in shares)     32,355 50,430
Repurchase of S&T Stock (in shares)   739,426   739,426
Treasury stock issued for restricted stock awards $ 0 $ 0 $ 0 $ 0
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) 53,691      
Forfeitures of restricted stock awards (in shares) 30,767 48,853    
Treasury stock issued for restricted stock awards $ 1,634 $ 997 $ 1,697 $ 997
Retained Earnings        
Treasury stock issued for restricted stock awards       0
Additional Paid-in Capital        
Treasury stock issued for restricted stock awards $ (1,634) $ (997) $ (1,697) $ (997)