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Loans, net and allowance for loan losses - Major Classifications of Loans Outstanding (Details 2) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net $ 1,270,545 $ 1,209,894
Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 342,937 319,590
Real Estate Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 529,499 493,481
Real Estate Residential [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 306,740 322,454
Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net $ 91,369 $ 74,369