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Federal Income Taxes (Narrative) (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Federal tax rate 34.00% 34.00% 34.00%
Unrecognized tax benefits that would affect the effective income tax rate if recognized $ 0    
Income Tax Examination, Penalties and Interest Expense 0 $ 0 $ 0
Income Tax Examination, Penalties and Interest Accrued $ 0 $ 0