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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, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due    
Nonaccrual loans, Total $ 11,108 $ 10,371
Commercial    
Financing Receivable, Recorded Investment, Past Due    
Nonaccrual loans, Total 934 1,632
Real estate Commercial    
Financing Receivable, Recorded Investment, Past Due    
Nonaccrual loans, Total 7,016 3,859
Real estate Residential    
Financing Receivable, Recorded Investment, Past Due    
Nonaccrual loans, Total 3,003 4,732
Consumer    
Financing Receivable, Recorded Investment, Past Due    
Nonaccrual loans, Total $ 155 $ 148