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Income Taxes - Current and Deferred Tax Expense (Benefit) (Detail) - 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: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 4,163 | $ 32,506 | $ 33,778
State |  |  |  |  |  |  |  |  | 1,731 | 1,314 | 2,337
Total current |  |  |  |  |  |  |  |  | 5,894 | 33,820 | 36,115
Deferred: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 39,003 | 2,606 | (525)
State |  |  |  |  |  |  |  |  | 1,631 | 554 | 851
Total deferred |  |  |  |  |  |  |  |  | 40,634 | 3,160 | 326
Income tax expense (benefit) | $ 15,740 | $ 11,969 | $ 10,451 | $ 8,368 | $ 10,182 | $ 9,281 | $ 8,781 | $ 8,736 | $ 46,528 | $ 36,980 | $ 36,441

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