Fair Value Measurements And Fair Values Of Financial Instruments (Schedule Of Level 3 Assets Measured At Fair Value On Nonrecurring Basis) (Details) - Nonrecurring [Member] - (Level 3) Significant Other Unobservable Inputs [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Impaired Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets measured at fair value		$ 8,040
Impaired Loans [Member] | Appraisal [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets measured at fair value	$ 5,991	$ 5,257
Unobservable Input	Appraisal adjustments
Impaired Loans [Member] | Business Asset Valuation Adjustments [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets measured at fair value	$ 5,306
Unobservable Input	Business asset valuation adjustments
Impaired Loans [Member] | Minimum [Member] | Appraisal [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	15.00%	15.00%
Impaired Loans [Member] | Minimum [Member] | Business Asset Valuation Adjustments [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	10.00%	10.00%
Impaired Loans [Member] | Maximum [Member] | Appraisal [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	55.00%	50.00%
Impaired Loans [Member] | Maximum [Member] | Business Asset Valuation Adjustments [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	73.00%	53.00%
Impaired Loans [Member] | Weighted Average [Member] | Appraisal [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	44.00%	39.00%
Impaired Loans [Member] | Weighted Average [Member] | Business Asset Valuation Adjustments [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	70.00%	51.00%
Foreclosed Real Estate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets measured at fair value	$ 797
Foreclosed Real Estate [Member] | Minimum [Member] | Appraisal [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	22.00%
Foreclosed Real Estate [Member] | Maximum [Member] | Appraisal [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	22.00%
Foreclosed Real Estate [Member] | Weighted Average [Member] | Appraisal [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	22.00%