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Income Taxes - Income Tax Expense (Benefit) (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
Federal |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | $ 32,282 | $ 24,521 | $ 24,825
Deferred |  |  |  |  |  |  |  |  | 13,980 | 665 | (427)
Total Federal |  |  |  |  |  |  |  |  | 46,262 | 25,186 | 24,398
State |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 323 | 248 | 0
Deferred |  |  |  |  |  |  |  |  | (148) | (129) | 0
Total State |  |  |  |  |  |  |  |  | 175 | 119 | 0
Total Federal and State | $ 22,255 | $ 8,883 | $ 8,604 | $ 6,695 | $ 6,510 | $ 7,367 | $ 5,496 | $ 5,931 | $ 46,437 | $ 25,305 | $ 24,398

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