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Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current      
Federal $ 8,337 $ 245 $ 820
State and local 518 184 320
Total current expense 8,855 429 1,140
Deferred      
Federal 537 3,610 8,198
State and local 2 90 180
Total deferred income tax expense 539 3,700 8,378
Total income tax expense $ 9,394 $ 4,129 $ 9,518