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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of provision for income taxes |  |  |  |  |  |  |  |  |  |  |
Taxes currently payable |  |  |  |  |  |  |  |  | $ 3,348 | $ 3,379 | $ 1,885
Impact of TCJA |  |  |  |  |  |  |  |  | (1,730) |  |
Deferred provision |  |  |  |  |  |  |  |  | (788) | 738 | 1,519
Income tax expense | $ (592) | $ 1,117 | $ 1,102 | $ 933 | $ 1,099 | $ 1,209 | $ 1,058 | $ 751 | $ 2,560 | $ 4,117 | $ 3,404

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