Fair Value Measurements (Quantitative Information About Level 3 Fair Value Measurements) (Details) - (Level 3) Significant Unobservable Inputs [Member] - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Impaired Loans [Member] | Appraisal Adjustment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset fair value	$ 1,001	$ 980
Impaired Loans [Member] | Appraisal Adjustment [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	(25.00%)	(25.00%)
Impaired Loans [Member] | Appraisal Adjustment [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	0.00%	0.00%
Impaired Loans [Member] | Appraisal Adjustment [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	(18.60%)	(23.20%)
Impaired Loans [Member] | Liquidation Expenses [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	(8.50%)	(8.50%)
Impaired Loans [Member] | Liquidation Expenses [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	0.00%	0.00%
Impaired Loans [Member] | Liquidation Expenses [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	(8.10%)	(7.70%)
Other Real Estate Owned [Member] | Liquidation Expenses [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset fair value	$ 297	$ 458
Range (Weighted Average)	(5.00%)	(5.00%)
Other Real Estate Owned [Member] | Liquidation Expenses [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	(5.00%)	(5.00%)