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Mergers and acquisitions - FNB Financial Corp. Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Feb. 14, 2020
USD ($)
branch
$ / shares
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Business Acquisition [Line Items]          
Merger related expenses   $ 20,730 $ 295 $ 25,366 $ 4,699
FNB Financial Corp.          
Business Acquisition [Line Items]          
Assets assumed in acquisition $ 258,218        
Loans assumed in acquisition 182,171        
Deposits assumed in acquisition $ 209,535        
Business acquisition, shares issued (in shares) | shares 954,797        
Cash consideration paid $ 15,001        
Business acquisition, share price (dollar per share) | $ / shares $ 36.70        
Business combination, consideration, value $ 50,042        
Preliminary goodwill resulting from merger $ 6,390     6,390  
Merger related expenses   $ 196   $ 2,293  
FNB Financial Corp. | Kentucky          
Business Acquisition [Line Items]          
Number of branches acquired | branch 4