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Loans, net and allowance for loan losses - Information Concerning Nonaccrual Loans by Major Loan Classification (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans, Total $ 10,371 $ 8,699
Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans, Total 1,632 1,322
Real Estate Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans, Total 3,859 3,732
Real Estate Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans, Total 4,732 3,523
Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans, Total $ 148 $ 122