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Income Taxes - Components (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Components of income tax expense (benefit) |  |  |
Current federal |  | $ (2,407) | $ 399
Current state | $ 84 |  |
Deferred federal | 6,226 | 11,724 | 6,824
Deferred state | 3,614 | 372 | 1,597
Expense due to enactment of federal tax reform |  | 9,475 |
Total income tax expenses | 9,924 | 19,164 | $ 8,820
Deferred tax assets |  |  |
Allowance for loan losses | 5,803 | 5,377 |
Deferred compensation | 665 | 650 |
Amortization of core deposit intangible |  | 827 |
Goodwill amortization/impairment | 4,698 | 6,087 |
Stock based compensation | 1,377 | 866 |
Business combination adjustments | 2,532 |  |
OREO write downs | 2,337 | 2,385 |
Federal net operating loss ("NOL") carryforward | 2,199 | 7,240 |
State net operating loss ("NOL") carryforward | 4,034 | 7,020 |
Other assets | 1,401 | 1,017 |
Total deferred tax assets | 25,046 | 31,469 |
Deferred tax liabilities |  |  |
Accumulated depreciation on premises and equipment | (443) | (384) |
Mortgage servicing rights | (2,210) | (2,086) |
Amortization of core deposit intangible | (130) |  |
State tax benefits | (1,839) | (2,389) |
Other liabilities | (741) | (545) |
Total deferred tax liabilities | (5,363) | (5,404) |
Net deferred tax asset before valuation allowance | 19,683 | 26,065 |
Tax effect of adjustments related to other comprehensive loss | 1,597 | (709) |
Net deferred tax asset | $ 21,280 | $ 25,356 |
Corporate federal tax rate | 21.00% | 35.00% |

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