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Mergers and acquisitions - Atlantic Capital Bank Narrative (Details)
$ in Thousands
3 Months Ended
Apr. 05, 2019
USD ($)
branch
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Business Acquisition [Line Items]      
Merger related expenses   $ 621 $ 1,193
Subsequent Event | Atlantic Capital Bank      
Business Acquisition [Line Items]      
Deposits assumed in acquisition $ 598,000    
Loans $ 385,000    
Percent of book value for acquired loans 99.32%    
Deposit premium percentage 6.25%    
Subsequent Event | TENNESSEE | Atlantic Capital Bank      
Business Acquisition [Line Items]      
Number of branches acquired | branch 11    
Subsequent Event | GEORGIA | Atlantic Capital Bank      
Business Acquisition [Line Items]      
Number of branches acquired | branch 3