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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, 2019 | Dec. 31, 2018
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Financing Receivable, Recorded Investment, Past Due |  |
Nonaccrual loans, Total | $ 7,510 | $ 6,231
Commercial |  |
Financing Receivable, Recorded Investment, Past Due |  |
Nonaccrual loans, Total | 3,336 | 776
Real estate Commercial |  |
Financing Receivable, Recorded Investment, Past Due |  |
Nonaccrual loans, Total | 2,765 | 2,663
Real estate Residential |  |
Financing Receivable, Recorded Investment, Past Due |  |
Nonaccrual loans, Total | 1,148 | 2,580
Consumer |  |
Financing Receivable, Recorded Investment, Past Due |  |
Nonaccrual loans, Total | $ 261 | $ 212

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