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Income Taxes - Income Tax Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Provision for current income taxes      
Federal $ 10,136 $ 12,207 $ 11,308
State 1,791 3,044 2,292
Total provision for current income taxes 11,927 15,251 13,600
Provision (benefit) for deferred income taxes, net      
Federal 199 (1,476) (1,109)
State (2,286) (372) 89
Total benefit for deferred income taxes, net (2,087) (1,848) (1,020)
Total provision for income taxes $ 9,840 $ 13,403 $ 12,580