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Mergers and acquisitions - Schedule of Fair Value of Acquired Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jul. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Fair value $ 92,455   $ 16,058
Clayton Banks      
Business Acquisition [Line Items]      
Contractually-required principal and interest   $ 112,584  
Nonaccretable difference   12,117  
Cash flows expected to be collected   100,467  
Accretable yield   18,457  
Fair value   $ 82,010