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Mergers and acquisitions - Schedule of Purchased Credit Deteriorated Credit Quality (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Aug. 15, 2020
Feb. 14, 2020
Sep. 30, 2020
Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Deterioration credit quality since origination, percentage 28.20% 10.10%    
Allowance for credit loss, purchased with credit deterioration     $ 24,831 $ 25,500
Franklin Financial Network, Inc.        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Principal balance $ 703,143      
Allowance for credit losses at acquisition (24,831)      
Net premium attributable to other factors 8,530      
Loans purchased credit-deteriorated fair value 686,842      
Allowance for credit loss, purchased with credit deterioration $ 52,822      
FNB Financial Corp.        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Principal balance   $ 18,964    
Allowance for credit losses at acquisition   (669)    
Net premium attributable to other factors   63    
Loans purchased credit-deteriorated fair value   18,358    
Allowance for credit loss, purchased with credit deterioration   $ 2,885