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Mergers and acquisitions - Farmers National Bank Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Feb. 14, 2020
USD ($)
branch
$ / shares
shares
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]          
Assets assumed in acquisition   $ 6,655,687 $ 5,335,156   $ 6,124,921
Loans assumed in acquisition   4,568,038   $ 4,409,642 4,409,642
Deposits assumed in acquisition   5,376,932     $ 4,934,938
Goodwill resulting from merger   5,808      
Merger related expenses   3,050 $ 621    
Farmers National          
Business Acquisition [Line Items]          
Number of branches acquired | branch 5        
Assets assumed in acquisition $ 258,190        
Loans assumed in acquisition 182,171        
Deposits assumed in acquisition $ 209,535        
Business acquisition, shares issued (in shares) | shares 954,797        
Cash consideration $ 15,001        
Business acquisition, share price (dollar per share) | $ / shares $ 36.7        
Business combination, consideration, value $ 50,042        
Goodwill resulting from merger $ 5,808        
Merger related expenses   $ 594