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Loans, net and allowance for loan losses - Major Classifications of Loans Outstanding (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable    
Loans, net $ 1,597,362 $ 1,532,965
Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 452,180 408,814
Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 719,652 700,144
Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 286,232 289,781
Consumer    
Accounts, Notes, Loans and Financing Receivable    
Loans, net $ 139,298 $ 134,226