Fair Value (Quantitative Information About Level 3 Fair Value Measurements) (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans		$ 1,961	$ 1,814
Other real estate owned, fair value		1,167	817
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans		1,961	1,814
Other real estate owned, fair value		1,167	817
Level 3 [Member] | Residential Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans		73	4
Level 3 [Member] | Commercial Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans		796	46
Level 3 [Member] | Commercial Term [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans		1,014	1,648
Level 3 [Member] | Consumer: Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans		$ 78	$ 116
Level 3 [Member] | Minimum [Member] | Other Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Disposal costs	[1],[2]	8.00%	(8.00%)
Level 3 [Member] | Minimum [Member] | Residential Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Appraisal adjustments	[1],[2]	0.00%	0.00%
Disposal costs	[1],[2]	(8.00%)	(8.00%)
Level 3 [Member] | Minimum [Member] | Commercial Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Appraisal adjustments	[1],[2]	0.00%	0.00%
Disposal costs	[1],[2]	(7.00%)	(8.00%)
Level 3 [Member] | Minimum [Member] | Commercial Term [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Appraisal adjustments	[1],[2]	0.00%	0.00%
Disposal costs	[1],[2]	(7.00%)	0.00%
Level 3 [Member] | Minimum [Member] | Consumer: Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Appraisal adjustments	[1],[2]	0.00%	0.00%
Disposal costs	[1],[2]	(8.00%)	(8.00%)
Level 3 [Member] | Maximum [Member] | Other Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Disposal costs	[1],[2]	8.00%	(8.00%)
Level 3 [Member] | Maximum [Member] | Residential Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Appraisal adjustments	[1],[2]	0.00%	0.00%
Disposal costs	[1],[2]	(8.00%)	(8.00%)
Level 3 [Member] | Maximum [Member] | Commercial Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Appraisal adjustments	[1],[2]	0.00%	0.00%
Disposal costs	[1],[2]	(8.00%)	(8.00%)
Level 3 [Member] | Maximum [Member] | Commercial Term [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Appraisal adjustments	[1],[2]	0.00%	(50.00%)
Disposal costs	[1],[2]	(31.00%)	(9.00%)
Level 3 [Member] | Maximum [Member] | Consumer: Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Appraisal adjustments	[1],[2]	0.00%	0.00%
Disposal costs	[1],[2]	(8.00%)	(8.00%)
Level 3 [Member] | Weighted Average [Member] | Other Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Disposal costs	[1],[2]	(8.00%)	(8.00%)
Level 3 [Member] | Weighted Average [Member] | Residential Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Appraisal adjustments	[1],[2]	0.00%	0.00%
Disposal costs	[1],[2]	(8.00%)	(8.00%)
Level 3 [Member] | Weighted Average [Member] | Commercial Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Appraisal adjustments	[1],[2]	0.00%	0.00%
Disposal costs	[1],[2]	(8.00%)	(8.00%)
Level 3 [Member] | Weighted Average [Member] | Commercial Term [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Appraisal adjustments	[1],[2]	0.00%	(6.00%)
Disposal costs	[1],[2]	(17.00%)	(8.00%)
Level 3 [Member] | Weighted Average [Member] | Consumer: Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Appraisal adjustments	[1],[2]	0.00%	0.00%
Disposal costs	[1],[2]	(8.00%)	(8.00%)

[1] Appraisals are adjusted by management for qualitative factors and disposal costs.

[2] December 31, 2017Quantitative Information about Level 3 Fair Value MeasurementFair Value ValuationRange(Dollars in thousands)EstimateTechniquesUnobservable Input(Weighted Average)Impaired loans - Residential mortgage$ 4Appraisal of Appraisal adj. (2)0%to0%(0%)collateral (1)Disposal costs (2)-8%to-8%(-8%)Impaired loans - Commercial mortgage 46Appraisal of Appraisal adj. (2)0%to0%(0%)collateral (1)Disposal costs (2)-8%to-8%(-8%)Impaired loans - Commercial term 1,648Appraisal of Appraisal adj. (2)0%to-50%(-6%)collateral (1)Disposal costs (2)0%to-9%(-8%)Impaired loans - Consumer other 116Appraisal of Appraisal adj. (2)0%to0%(0%)collateral (1)Disposal costs (2)-8%to-8%(-8%)Impaired loan total$ 1,814Other real estate owned$ 817Disposal costs (2)-8%to-8%(-8%)Fair value is generally determined through independent appraisals or sales contracts of the underlying collateral, which generally include various level 3 inputs which are not identifiable.