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Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Loss, Net of Taxes) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Unrealized Loss on Securities $ (1,073) $ (2,919) $ 1,565
Defined Benefit Plans 62 66 247
Accumulated Other Comprehensive Loss $ (1,011) $ (2,853) $ 1,812