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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, 2021 | Dec. 31, 2020
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Financing Receivable, Recorded Investment, Past Due |  |
Nonaccrual loans, Total | $ 3,974 | $ 8,117
Commercial |  |
Financing Receivable, Recorded Investment, Past Due |  |
Nonaccrual loans, Total | 648 | 3,822
Real estate Commercial |  |
Financing Receivable, Recorded Investment, Past Due |  |
Nonaccrual loans, Total | 2,435 | 3,262
Real estate Residential |  |
Financing Receivable, Recorded Investment, Past Due |  |
Nonaccrual loans, Total | 809 | 922
Consumer |  |
Financing Receivable, Recorded Investment, Past Due |  |
Nonaccrual loans, Total | $ 82 | $ 111

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