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Loans, net and allowance for loan losses - Major Classifications of Loans Outstanding (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable    
Loans, net $ 1,464,808 $ 1,340,865
Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 394,283 365,767
Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 647,058 567,277
Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 299,037 306,218
Consumer    
Accounts, Notes, Loans and Financing Receivable    
Loans, net $ 124,430 $ 101,603