Allowance For Loan Losses (Schedule Of Troubled Debt Restructurings) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) contract	Dec. 31, 2016 USD ($) contract
Financing Receivable, Modifications [Line Items]
Accruing	$ 32,568	$ 29,096
Non-Accruing	134	421
Total	$ 32,702	$ 29,517
Number of Contracts | contract	48	48
Pre-modification Outstanding Recorded Investment	$ 7,356	$ 9,054
Post-modification Outstanding Recorded Investment	7,261	8,399
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Accruing	135	42
Non-Accruing	0	0
Total	$ 135	$ 42
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	8,381	5,525
Non-Accruing	0	0
Total	$ 8,381	$ 5,525
Number of Contracts | contract	2	2
Pre-modification Outstanding Recorded Investment	$ 3,098	$ 5,021
Post-modification Outstanding Recorded Investment	3,003	4,366
Residential real estate
Financing Receivable, Modifications [Line Items]
Accruing	21,005	20,424
Non-Accruing	84	391
Total	$ 21,089	$ 20,815
Number of Contracts | contract	33	37
Pre-modification Outstanding Recorded Investment	$ 3,987	$ 3,812
Post-modification Outstanding Recorded Investment	3,987	3,812
Home equity
Financing Receivable, Modifications [Line Items]
Accruing	3,047	3,105
Non-Accruing	50	30
Total	$ 3,097	$ 3,135
Number of Contracts | contract	13	9
Pre-modification Outstanding Recorded Investment	$ 271	$ 221
Post-modification Outstanding Recorded Investment	271	221
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