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Income Taxes - Income Tax Provision (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Current income tax expense |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 1,243 | $ 2,771 | $ 3,158
State |  |  |  |  |  |  |  |  | 2,130 | 187 | 1,283
Total current income tax expense |  |  |  |  |  |  |  |  | 3,373 | 2,958 | 4,441
Deferred income tax (benefit) expense |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | (25) | 104 | 69
State |  |  |  |  |  |  |  |  | 7 | 33 | 25
Total deferred income tax (benefit) expense |  |  |  |  |  |  |  |  | (18) | 137 | 94
Total provision | $ 1,169 | $ 507 | $ 442 | $ 1,237 | $ 375 | $ 163 | $ 2,366 | $ 191 | $ 3,355 | $ 3,095 | $ 4,535

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