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Business Combinations - Additional Information (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Nov. 30, 2019
USD ($)
banking_location
$ / shares
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]                
Goodwill $ 373,417,000 $ 371,621,000   $ 373,417,000   $ 373,417,000   $ 371,621,000
Adjustments, Loans 9,300,000 $ 12,300,000            
Merger related expenses       0 $ 552,000 2,342,000 $ 1,171,000  
Professional services and legal       1,911,000 $ 1,054,000 4,890,000 $ 3,382,000  
DNB                
Business Acquisition [Line Items]                
Number of banking locations | banking_location     14          
Shares of S&T offered for each share of DNB (shares) | shares     1.22          
Fair value of total consideration 200,991,000   $ 200,991,000          
Cash 360,000   $ 360,000          
S&T common shares issued (shares) | shares     5,318,964          
S&T common shares issued, fair value (in dollars per share) | $ / shares     $ 37.72          
Goodwill 85,970,000   $ 84,175,000 85,970,000   85,970,000    
Preliminary estimates adjustments           1,795,000    
Adjustments, Loans     8,143,000     2,377,000    
Adjustments, Borrowings     276,000     257,000    
Adjustment, Other liabilities     3,184,000     122,000    
Adjustments, Other assets     4,278,000     108,000    
Adjustments, Deferred income taxes     (3,298,000)     311,000    
Carryover of allowance for credit losses 0   0 0   0    
Fair value of loans acquired 906,607,000   908,984,000 906,607,000   906,607,000    
Discount on loans acquired     $ 10,500,000          
Direct costs related to merger $ 13,700,000     $ 13,700,000   13,700,000    
Merger related expenses           2,300,000   11,400,000
Professional services and legal           200,000   2,800,000
Severance payments           1,400,000   3,400,000
Data processing, contract termination, and conversion cost expenses           400,000   4,700,000
Other expenses           $ 300,000   $ 500,000