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Income Taxes (Schedule of Components of Income Tax Expense) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |
Current - Federal |  | $ 11,286 | $ 12,827 | $ 9,149
- State |  | 1,996 | 1,679 | 1,436
Deferred - Federal |  | 7,742 | 16 | 3,205
- State |  | 743 | 102 | 336
Income tax expense (benefit) | $ 1,300 | $ 21,767 | $ 14,624 | $ 14,126

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