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Income Taxes - Summary of Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current expense: |  |  |
Federal | $ 20,924 | $ 19,802 | $ 14,755
State | 6,804 | 6,503 | 5,084
Total current expense | 27,728 | 26,305 | 19,839
Deferred expense (benefit): |  |  |
Federal | 14,623 | 4,410 | 13,663
State | (1,727) | 2,184 | 4,680
Total deferred expense | 12,896 | 6,594 | 18,343
Provision for income taxes | $ 40,624 | $ 32,899 | $ 38,182

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