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Loans (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Receivables [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of year |  |  |  | $ 6,627 |  |  |  | $ 6,263 |  |  |  | $ 5,797 | $ 6,627 | $ 6,263 | $ 5,797
Provision for loan losses | $ 276 | $ 1,062 | $ 1,250 | $ 1,075 |  | $ 25 | $ 9 | $ 105 | $ 94 | $ 20 | $ 30 | $ 202 | 3,663 | 139 | 346
Charged off loans |  |  |  |  |  |  |  |  |  |  |  |  | (110) | (145) | (164)
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 209 | 370 | 284
Balance at end of year | $ 10,389 |  |  |  | $ 6,627 |  |  |  | $ 6,263 |  |  |  | $ 10,389 | $ 6,627 | $ 6,263

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