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Loans, net and allowance for loan losses - Major Classifications of Loans Outstanding (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable    
Loans, net $ 1,409,691 $ 1,340,865
Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 395,407 365,767
Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 598,875 567,277
Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 301,686 306,218
Consumer    
Accounts, Notes, Loans and Financing Receivable    
Loans, net $ 113,723 $ 101,603