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Income Taxes - Summary of Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Current expense: |  |  |
Federal | $ 14,755 | $ 21,037 | $ 12,711
State | 5,084 | 5,753 | 463
Total current expense | 19,839 | 26,790 | 13,174
Deferred expense (benefit): |  |  |
Federal | 13,663 | (3,597) | 8,197
State | 4,680 | (333) | 1,403
Total deferred expense | 18,343 | (3,930) | 9,600
Provision for income taxes | $ 38,182 | $ 22,860 | $ 22,774

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