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9. Income Taxes (Details 1) - 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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Tax expense at statutory rate |  |  |  |  |  |  |  |  | $ 2,908 | $ 3,613 | $ 3,361
Differences: |  |  |  |  |  |  |  |  |  |  |
State income tax, net of federal income tax effect |  |  |  |  |  |  |  |  | 261 | 327 | 358
Tax exempt interest income |  |  |  |  |  |  |  |  | (649) | (802) | (990)
Increase in cash surrender value of life insurance |  |  |  |  |  |  |  |  | (80) | (81) | (81)
Nondeductible interest and other expense |  |  |  |  |  |  |  |  | 46 | 40 | 23
Other |  |  |  |  |  |  |  |  | 3 | 39 | (47)
Total income tax | $ 374 | $ 1,113 | $ 535 | $ 467 | $ 672 | $ 834 | $ 845 | $ 785 | $ 2,489 | $ 3,136 | $ 2,624

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