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Income Taxes - Schedule of Effective Income Tax Reconciliation (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]                      
Federal tax expense at statutory rate                 $ 13,632 $ 13,349 $ 8,379
Increase (reduction) in income taxes resulting from:                      
State tax, net of federal benefit                 1,275 1,098 603
Non-deductible compensation                   378  
Other                 10 (51) 155
Total $ 4,014 $ 4,020 $ 3,668 $ 3,215 $ 4,969 $ 3,987 $ 3,316 $ 2,502 $ 14,917 $ 14,774 $ 9,137