Allowance For Loan Losses (Schedule Of Troubled Debt Restructurings) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($) contract	Sep. 30, 2017 USD ($) contract	Dec. 31, 2017 USD ($)
Financing Receivable, Modifications [Line Items]
Accruing	$ 31,694		$ 32,568
Non-Accruing	175		134
Total	$ 31,869		32,702
Number of Contracts | contract	31	34
Pre-Modification Outstanding Recorded Investment	$ 1,665	$ 3,154
Post Modification Outstanding Recorded Investment	1,665	$ 3,154
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Accruing	108		135
Non-Accruing	0		0
Total	$ 108		135
Number of Contracts | contract	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0
Post Modification Outstanding Recorded Investment	0	$ 0
Commercial real estate
Financing Receivable, Modifications [Line Items]
Accruing	8,231		8,381
Non-Accruing	0		0
Total	$ 8,231		8,381
Number of Contracts | contract	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0
Post Modification Outstanding Recorded Investment	0	$ 0
Residential real estate
Financing Receivable, Modifications [Line Items]
Accruing	20,414		21,005
Non-Accruing	175		84
Total	$ 20,589		21,089
Number of Contracts | contract	22	27
Pre-Modification Outstanding Recorded Investment	$ 1,465	$ 3,009
Post Modification Outstanding Recorded Investment	1,465	$ 3,009
Home equity
Financing Receivable, Modifications [Line Items]
Accruing	2,941		3,047
Non-Accruing	0		50
Total	$ 2,941		3,097
Number of Contracts | contract	9	7
Pre-Modification Outstanding Recorded Investment	$ 200	$ 145
Post Modification Outstanding Recorded Investment	200	$ 145
Consumer
Financing Receivable, Modifications [Line Items]
Accruing	0		0
Non-Accruing	0		0
Total	$ 0		$ 0
Number of Contracts | contract	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0
Post Modification Outstanding Recorded Investment	$ 0	$ 0