Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Reduction in income tax expense based upon initial revaluation of deferred tax assets and liabilities as result of tax reform	$ 2,284,000
Amount of retained earnings which has no provision for federal income taxes		$ 5,095,000
Unrecorded deferred income tax liability		1,070,000
Unrecognized tax benefits	0	0	$ 0
Increase in unrecognized tax benefits relative to tax positions taken		0
Accrual of unrecognized tax benefit, income tax penalties and interest accrued	$ 0	$ 0	$ 0