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9. Income Taxes (Details) - 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] |  |  |  |  |  |  |  |  |  |  |
Current expense |  |  |  |  |  |  |  |  | $ 3,049 | $ 2,960 | $ 2,546
Deferred income tax expense |  |  |  |  |  |  |  |  | (560) | 176 | 78
Total income tax | $ 374 | $ 1,113 | $ 535 | $ 467 | $ 672 | $ 834 | $ 845 | $ 785 | $ 2,489 | $ 3,136 | $ 2,624

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