Allowance for Loan and Lease Loss and Credit Quality (Schedule Of Newly Restructured Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs	$ 0	$ 10,755	$ 106	$ 13,927
Commercial
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs		9,874		12,793
Residential
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs		881	106	1,134
Rate Modifications
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs	0	0	0	0
Rate Modifications | Commercial
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs		0		0
Rate Modifications | Residential
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs		0	0	0
Term Modifications
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs	0	0	0	0
Term Modifications | Commercial
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs		0		0
Term Modifications | Residential
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs		0	0	0
Interest Only Modifications
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs	0	0	0	0
Interest Only Modifications | Commercial
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs		0		0
Interest Only Modifications | Residential
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs		0	0	0
Payment Modifications
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs	0	0	0	0
Payment Modifications | Commercial
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs		0		0
Payment Modifications | Residential
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs		0	0	0
Combination Modifications
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs	$ 0	10,755	106	13,927
Combination Modifications | Commercial
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs		9,874		12,793
Combination Modifications | Residential
Financing Receivable, Modifications [Line Items]
Total restructured loans, net of deferred fees and costs		$ 881	$ 106	$ 1,134