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Income Taxes (Components of Federal and State Income Tax Expense (Benefit)) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current      
Federal $ 0 $ 0 $ 0
State 0 0 0
Total current 0 0 0
Deferred      
Federal 210 332 0
State 33 33 0
Total deferred 243 365 0
Total income tax expense (benefit) $ 243 $ 365 $ 0