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Mergers and acquisitions - Schedule of Fair Value of Acquired Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jul. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Fair value $ 88,835   $ 16,058 $ 21,375
Clayton Banks        
Business Acquisition [Line Items]        
Contractually-required principal and interest   $ 115,448    
Nonaccretable difference   (12,430)    
Best estimate of contractual cash flows expected to be collected   103,018    
Accretable yield   (18,868)    
Fair value   $ 84,150