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, 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