Fair Values (Quantitative Information About Level 3 Fair Value Measurements) (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2019		Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans		$ 1,317		$ 1,523
Other real estate owned, fair value		526		1,247
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	[2]	1,317	[1]	1,523
Other real estate owned, fair value	[2]	526		1,247	[1]
Level 3 [Member] | Residential Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	[2]			72
Level 3 [Member] | Commercial Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	[2]	659		659	[1]
Level 3 [Member] | Commercial Term [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	[2]	517	[1]	754
Level 3 [Member] | Consumer: Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	[2]	$ 141		$ 38	[1]
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]			(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]	(14.00%)		(14.00%)
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%
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]	(7.00%)		(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]			(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]	(14.00%)		(14.00%)
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]	(8.00%)		(16.00%)
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]	(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]			(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]	(14.00%)		(14.00%)
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]	(4.00%)		(11.00%)
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]	(8.00%)		(8.00%)

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

[2] 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.