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Mergers and acquisitions - Farmers National Bank Narrative (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Feb. 14, 2020
USD ($)
$ / shares
Dec. 17, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
branch
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]          
Assets assumed in acquisition     $ 6,124,921 $ 5,136,764 $ 4,727,713
Loans assumed in acquisition     4,409,642 3,667,511  
Deposits assumed in acquisition     $ 4,934,938 $ 4,171,717  
Farmers National Bank of Scottsville          
Business Acquisition [Line Items]          
Number of branches acquired | branch     5    
Assets assumed in acquisition     $ 255,172    
Loans assumed in acquisition     178,603    
Deposits assumed in acquisition     $ 205,957    
Business acquisition, shares issued (in shares) | shares   954,797      
Cash consideration   $ 15,000      
Subsequent Event | Farmers National Bank of Scottsville          
Business Acquisition [Line Items]          
Business acquisition, share price | $ / shares $ 36.70        
Business combination, consideration, value $ 50,042