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Income Taxes - Components (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Components of income tax expense (benefit) |  |  |  |
Current federal |  | $ (2,407) | $ 399 | $ 220
Deferred federal |  | 11,724 | 6,824 | 7,023
Deferred state |  | 372 | 1,597 | 1,733
Expense due to enactment of federal tax reform |  | 9,475 |  |
Provision for income taxes |  | 19,164 | 8,820 | $ 8,976
Deferred tax assets |  |  |  |
Allowance for loan losses |  | 5,377 | 7,057 |
Deferred compensation |  | 650 | 735 |
Amortization of core deposit |  | 827 | 1,401 |
Goodwill amortization/impairment |  | 6,087 | 10,127 |
Stock option expense |  | 866 | 946 |
OREO write downs |  | 2,385 | 5,110 |
Federal net operating loss ("NOL") carryforward |  | 7,240 | 19,362 |
State net operating loss ("NOL") carryforward |  | 7,020 | 7,735 |
Deferred tax credit |  |  | 2,058 |
Other assets |  | 1,017 | 1,199 |
Total deferred tax assets |  | 31,469 | 55,730 |
Deferred tax liabilities |  |  |  |
Accumulated depreciation on premises and equipment |  | (384) | (681) |
Mortgage servicing rights |  | (2,086) | (2,760) |
State tax benefits |  | (2,389) | (4,127) |
Other liabilities |  | (545) | (526) |
Total deferred tax liabilities |  | (5,404) | (8,094) |
Net deferred tax asset before valuation allowance |  | 26,065 | 47,636 |
Tax effect of adjustments related to other comprehensive loss |  | (709) | 5,828 |
Net deferred tax asset |  | $ 25,356 | $ 53,464 |
Corporate federal tax rate |  | 35.00% |  |
Forecast |  |  |  |
Deferred tax liabilities |  |  |  |
Corporate federal tax rate | 21.00% |  |  |

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