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Loans, net and allowance for loan losses - Information Concerning Nonaccrual Loans by Major Loan Classification (Details 6) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans, Total $ 9,375 $ 8,699
Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans, Total 1,444 1,322
Real Estate Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans, Total 3,415 3,732
Real Estate Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans, Total 4,326 3,523
Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans, Total $ 190 $ 122