Allowance for Loan and Lease Loss and Credit Quality (Schedule Of Newly Restructured Loans) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs	$ 106	$ 3,172
Term, net | Commercial
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs		2,919
Mortgage | Residential
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs	106	253
Rate Modifications
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs	0	0
Rate Modifications | Term, net | Commercial
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs		0
Rate Modifications | Mortgage | Residential
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs	0	0
Term Modifications
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs	0	0
Term Modifications | Term, net | Commercial
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs		0
Term Modifications | Mortgage | Residential
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs	0	0
Interest Only Modifications
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs	0	0
Interest Only Modifications | Term, net | Commercial
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs		0
Interest Only Modifications | Mortgage | Residential
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs	0	0
Payment Modifications
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs	0	0
Payment Modifications | Term, net | Commercial
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs		0
Payment Modifications | Mortgage | Residential
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs	0	0
Combination Modifications
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs	106	3,172
Combination Modifications | Term, net | Commercial
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs		2,919
Combination Modifications | Mortgage | Residential
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs	$ 106	$ 253