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Loans, net and allowance for loan losses - Information Concerning Nonaccrual Loans by Major Loan Classification (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due    
Nonaccrual loans, Total $ 9,253 $ 6,231
Commercial    
Financing Receivable, Recorded Investment, Past Due    
Nonaccrual loans, Total 4,494 776
Real estate Commercial    
Financing Receivable, Recorded Investment, Past Due    
Nonaccrual loans, Total 3,044 2,663
Real estate Residential    
Financing Receivable, Recorded Investment, Past Due    
Nonaccrual loans, Total 1,464 2,580
Consumer    
Financing Receivable, Recorded Investment, Past Due    
Nonaccrual loans, Total $ 251 $ 212