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Loans, net and allowance for loan losses - Information Concerning Nonaccrual Loans by Major Loan Classification (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due    
Nonaccrual loans, Total $ 8,364 $ 7,510
Commercial    
Financing Receivable, Recorded Investment, Past Due    
Nonaccrual loans, Total 4,259 3,336
Real estate Commercial    
Financing Receivable, Recorded Investment, Past Due    
Nonaccrual loans, Total 2,834 2,765
Real estate Residential    
Financing Receivable, Recorded Investment, Past Due    
Nonaccrual loans, Total 1,168 1,148
Consumer    
Financing Receivable, Recorded Investment, Past Due    
Nonaccrual loans, Total $ 103 $ 261