Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Provision (Benefit) for Income Taxes (Detail)

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Income Taxes - Summary of Provision (Benefit) for Income Taxes (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current expense:      
Federal $ 19,802 $ 14,755 $ 21,037
State 6,503 5,084 5,753
Total current expense 26,305 19,839 26,790
Deferred expense (benefit):      
Federal 4,410 13,663 (3,597)
State 2,184 4,680 (333)
Total deferred expense 6,594 18,343 (3,930)
Provision for income taxes $ 32,899 $ 38,182 $ 22,860