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Loans, net and allowance for loan losses - Major Classifications of Loans Outstanding (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable      
Loans, net $ 1,532,965 $ 1,340,865 $ 1,209,894
Commercial      
Accounts, Notes, Loans and Financing Receivable      
Loans, net 408,814 365,767 319,590
Real estate Commercial      
Accounts, Notes, Loans and Financing Receivable      
Loans, net 700,144 567,277 493,481
Consumer      
Accounts, Notes, Loans and Financing Receivable      
Loans, net $ 134,226 $ 101,603 $ 74,369