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Allowance for Credit Losses - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Adjustment to allowance for credit loss $ 109,636 $ 114,609 $ 109,636 $ 114,609 $ 115,101 $ 117,612 $ 96,850   $ 62,224
Provision for credit losses on loans 2,008 85,831 5,308 104,262          
Provision for credit losses 555 927 391 2,543          
Charge-offs 8,737 68,303 15,270 79,749          
Total loans 6,897,715   6,897,715     7,108,248      
Recoveries 1,264 231 1,985 520          
COVID-19                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Financing receivable, credit loss, expense (reversal), period increase (decrease) 84,200 86,800 101,100 106,800          
Provision for credit losses on loans 2,600   5,700            
Provision for credit losses 600   $ 400            
Forecast period     2 years            
Commercial and industrial | Commercial                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Adjustment to allowance for credit loss 14,426 19,164 $ 14,426 19,164 $ 14,663 $ 16,100 19,870   15,681
Provision for credit losses on loans 225 60,906 2,953 67,104          
Charge-offs 473 61,616 4,774 71,496          
Recoveries 11 4 $ 148 22          
Customer Fraud, Check Kiting                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Charge-offs   58,700              
Customer Fraud                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Charge-offs   4,200              
Total loans   $ 15,100   $ 15,100          
Recoveries $ 900                
Impact of new accounting standard                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Adjustment to allowance for credit loss             0   27,352
Impact of new accounting standard | ASU No. 2016-13                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Adjustment to allowance for credit loss               $ 27,400  
Impact of new accounting standard | S&T Legacy Loans | ASU No. 2016-13                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Adjustment to allowance for credit loss               8,200  
Impact of new accounting standard | Commercial and industrial | Commercial                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Adjustment to allowance for credit loss             $ 0   $ 7,853
Impact of new accounting standard | Commercial and industrial | Commercial | ASU No. 2016-13                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Adjustment to allowance for credit loss               9,900  
Impact of new accounting standard | DNB | ASU No. 2016-13                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Adjustment to allowance for credit loss               $ 9,300