Federal Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
Effective income tax rate	22.60%	25.90%
Federal income tax rate	34.00%	34.00%
Material unrecognized tax benefits or accrued interest and penalties	$ 0.0
Operating Loss Carryforwards	$ 7.4	$ 6.8
Minimum [Member]
Income Tax Contingency [Line Items]
Open Tax Year	2012
Maximum [Member]
Income Tax Contingency [Line Items]
Open Tax Year	2014