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Allowance for Credit Losses - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2020
Jun. 30, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Accounting Standards Update [Extensible List]       us-gaap:AccountingStandardsUpdate201613Member   us-gaap:AccountingStandardsUpdate201613Member us-gaap:AccountingStandardsUpdate201602Member    
Adjustment to allowance for credit loss $ 120,998 $ 114,609 $ 62,115 $ 120,998 $ 62,115 $ 62,224 $ 60,996 $ 62,224 $ 61,479
Charge-offs 13,667   4,700 93,416 13,391        
Total loans 7,273,870     7,273,870   7,074,928   7,074,928  
Restructured loans 4,562   25,800 11,586 36,712        
Reserve 19,302   4,913 123,564 12,767        
Increase (decrease) change in qualitative reserve (13,500)     $ 15,800          
Forecast period       2 years          
Portfolio loans, net of unearned income 7,394,868     $ 7,394,868   7,137,152      
Senior Lien                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Reserve 3,400                
Commercial                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Portfolio loans, net of unearned income 5,810,034     5,810,034   5,512,796      
Commercial | Special mention                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Portfolio loans, net of unearned income           103,878      
Commercial | Substandard                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Portfolio loans, net of unearned income           152,651      
Nonperforming                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Restructured loans       18,648   8,912      
Portfolio loans, net of unearned income 84,072     84,072          
Impact of ASU 2016-13 Adoption                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Adjustment to allowance for credit loss           27,352   27,353  
Total loans               (27,353)  
S&T Legacy Loans | Impact of ASU 2016-13 Adoption                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Adjustment to allowance for credit loss               8,200  
Commercial and industrial | Commercial                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Adjustment to allowance for credit loss 14,211 19,164 14,367 14,211 14,367 15,681 11,596   13,227
Charge-offs 1,196   1,467 72,692 8,379        
Restructured loans 4,022   1,527 5,381 5,860        
Reserve (4,155)   2,397 62,949 10,432        
Portfolio loans, net of unearned income 1,818,649     1,818,649   1,480,529   1,720,833  
Commercial and industrial | Commercial | Special mention                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Portfolio loans, net of unearned income 74,919     74,919          
Commercial and industrial | Commercial | Substandard                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Portfolio loans, net of unearned income 36,261     36,261          
Commercial and industrial | Nonperforming | Commercial                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Restructured loans       1,549   695      
Portfolio loans, net of unearned income 5,686     5,686          
Commercial and industrial | Impact of ASU 2016-13 Adoption | Commercial                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Adjustment to allowance for credit loss           7,853   9,900  
Portfolio loans, net of unearned income               (262,292)  
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              
Customer fraud | Nonperforming                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Restructured loans       10,900          
CARES Act, Paycheck Protection Program Loans                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Total loans 550,100     550,100          
Restructured loans       350,000          
ACL provision, COVID-19 assessment, revised forecast (13,300)     12,700          
Increase (decrease) in ACL provision, COVID-19 assessment, changes in current conditions (200)     3,100          
CARES Act, Paycheck Protection Program Loans | Commercial                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Total loans 550,100     550,100          
Customer fraud, commercial real estate | Commercial                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Total loans   14,300              
Customer fraud, line of credit                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Total loans   800              
Business banking | Commercial                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Adjustment to allowance for credit loss 14,792 14,404   14,792   0      
Charge-offs 1,748     2,469          
Reserve 2,072     4,197          
ACL provision, COVID-19 assessment 2,000                
Portfolio loans, net of unearned income 1,015,951     1,015,951   846,790   0  
Business banking | Commercial | Special mention                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Portfolio loans, net of unearned income 11,789     11,789          
Business banking | Commercial | Substandard                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Portfolio loans, net of unearned income 39,422     39,422          
Business banking | Nonperforming | Commercial                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Restructured loans       441          
Portfolio loans, net of unearned income 18,081     18,081          
Business banking | Impact of ASU 2016-13 Adoption | Commercial                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Adjustment to allowance for credit loss           12,898      
Portfolio loans, net of unearned income               1,092,908  
Commercial real estate | Commercial                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Adjustment to allowance for credit loss 71,554 $ 57,730 31,830 71,554 31,830 30,577 $ 33,707   $ 32,836
Charge-offs 10,187   2,304 16,229 2,833        
Restructured loans 171   23,784 2,381 29,747        
Reserve 23,839   $ 1,292 52,185 $ 822        
Portfolio loans, net of unearned income 2,818,227     2,818,227   3,059,592   3,416,518  
Commercial real estate | Commercial | Hotel                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Portfolio loans, net of unearned income $ 243,000     $ 243,000          
Amount deferred (as a percent) 95.00%     95.00%          
Commercial real estate | Commercial | Special mention                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Portfolio loans, net of unearned income $ 168,743     $ 168,743          
Commercial real estate | Commercial | Special mention | Hotel                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Portfolio loans, net of unearned income 92,900     92,900          
Commercial real estate | Commercial | Substandard                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Portfolio loans, net of unearned income 203,543     203,543          
Commercial real estate | Commercial | Substandard | Hotel                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Portfolio loans, net of unearned income 126,600     126,600          
Commercial real estate | Nonperforming | Commercial                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Restructured loans       14,504   6,713      
Portfolio loans, net of unearned income $ 47,095     $ 47,095          
Commercial real estate | Impact of ASU 2016-13 Adoption | Commercial                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Adjustment to allowance for credit loss           $ 4,810      
Portfolio loans, net of unearned income               (470,199)  
DNB | Impact of ASU 2016-13 Adoption                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Adjustment to allowance for credit loss               $ 9,300