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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
Income Tax Disclosure [Abstract]      
Current federal $ 3,608 $ 3,198 $ 2,474
Current state 1,098 1,605 1,444
Deferred federal 501 1,092 2,315
Deferred state (109) 232 191
Provision for income taxes $ 5,098 $ 6,127 $ 6,424