Federal Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Effective income tax rate		40.71%	27.29%
Federal income tax rate		34.00%	34.00%
Material unrecognized tax benefits or accrued interest and penalties		$ 0.0
Income tax expense resulted from re-measurement of net deferred tax asset		1.8
Scenario, Plan [Member]
Income Tax Contingency [Line Items]
Federal income tax rate	21.00%
State and Local Jurisdiction [Member] | Commonwealth of Pennsylvania [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards		$ 10.5	$ 8.7
Minimum [Member]
Income Tax Contingency [Line Items]
Open tax year for examinations		2014
Maximum [Member]
Income Tax Contingency [Line Items]
Open tax year for examinations		2016