Fair Value Measurements (Quantitative Information About Level 3 Fair Value Measurements For Certain Financial Assets) (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Impaired Loans [Member] | Measurement Input, Cost to Sell
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Quantitative information about Level 3 Fair Value Measurements	12.00%	12.00%
Impaired Loans [Member] | Measurement Input, Discount Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Quantitative information about Level 3 Fair Value Measurements	5.00%	5.00%
Impaired Loans [Member] | Measurement Input, Discount Rate | Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Quantitative information about Level 3 Fair Value Measurements	4.00%	4.00%
Impaired Loans [Member] | Measurement Input, Discount Rate | Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Quantitative information about Level 3 Fair Value Measurements	6.00%	6.00%
Other Real Estate Owned [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Quantitative information about Level 3 Fair Value Measurements	6.00%	6.00%