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Income Taxes (Narrative) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 21, 2017
Income Taxes [Abstract]          
Effective tax rate, Statutory federal tax     21.00%   35.00%
Income Tax Expense (Benefit) $ 3,486 $ 3,864 $ 6,195 $ 6,430