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Income Taxes - Summary of components of income tax expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Income Taxes |  |
Corporate tax rate | 21.00% | 34.00%
One time income tax expense due to the Tax Reform Act |  | $ 600
Current income tax (benefit) expense: |  |
Federal | $ (1,191) | 328
State | 57 | 143
Total current tax expense | (1,134) | 471
Deferred income tax benefits: |  |
Federal | 1,228 | 443
State | 36 | (1)
Total deferred tax expense | 1,264 | 442
Income tax expense (benefit) | $ 130 | $ 913

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