Fair Value of Assets and Liabilities (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	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Impaired Loans [Member] | Appraisal [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets measured at fair value	$ 311	$ 1,331
Unobservable Input	Appraisal adjustments
Impaired Loans [Member] | Internal Financial Statements Provided By Customers [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets measured at fair value	$ 8,372
Unobservable Input	Valuation adjustments
Impaired Loans [Member] | Minimum [Member] | Appraisal [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	15.00%	24.00%
Impaired Loans [Member] | Minimum [Member] | Internal Financial Statements Provided By Customers [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	0.00%
Impaired Loans [Member] | Maximum [Member] | Appraisal [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	25.00%	52.00%
Impaired Loans [Member] | Maximum [Member] | Internal Financial Statements Provided By Customers [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	52.00%
Impaired Loans [Member] | Weighted Average [Member] | Appraisal [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	23.00%	38.00%
Impaired Loans [Member] | Weighted Average [Member] | Internal Financial Statements Provided By Customers [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	50.00%
Mortgage Servicing Rights [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable Input	Estimated prepayment speed based on rate and term
Mortgage Servicing Rights [Member] | Multiple Of Annual Service Fee [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets measured at fair value	$ 1,081	$ 769
Mortgage Servicing Rights [Member] | Minimum [Member] | Multiple Of Annual Service Fee [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	7.20%	6.90%
Mortgage Servicing Rights [Member] | Maximum [Member] | Multiple Of Annual Service Fee [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	8.30%	8.50%
Mortgage Servicing Rights [Member] | Weighted Average [Member] | Multiple Of Annual Service Fee [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range	7.40%	7.60%