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Loans (Details 4) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2019
Receivables [Abstract] |  |  |  |  |  |  |
Total loans considered impaired | $ 3,224 | $ 4,155 |  | $ 3,224 | $ 4,155 |  | $ 3,997
Loans considered impaired for which there is a related allowance for loan loss: |  |  |  |  |  |  |
Outstanding loan balance | 144 |  |  | 144 |  |  | 256
Related allowance | 3 | 14 |  | 3 | 14 |  | 6
Loans considered impaired and previously written down to fair value | 2,426 |  |  | 2,426 |  |  | 2,275
Impaired Financing Receivable, Average Recorded Investment | 3,524 | $ 4,030 |  | 3,658 | 4,354 |  | 4,431
Impaired Financing Receivable, Interest Income, Accrual Method | $ 85 |  | $ 98 | $ 239 | $ 168 | $ 263 | $ 263

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