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Mergers and acquisitions - Schedule of Consideration Paid and Allocation of Purchase Price to Net Assets Acquired (Details) - USD ($)
$ in Thousands
Apr. 05, 2019
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Preliminary allocation of consideration:        
Goodwill   $ 168,486 $ 137,190 $ 137,190
Atlantic Capital Bank        
Purchase price:        
Deposit premium $ 36,790      
Preliminary allocation of consideration:        
Fair value of net assets acquired including identifiable intangible assets 5,394      
Goodwill 31,396      
Total consideration paid $ 36,790