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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

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