Allowance For Loan Losses (Schedule Of Non-Commercial Loans By Payment Performance) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Total	$ 2,557,035	$ 2,606,197
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,214,785	1,207,150
Residential Real Estate [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,213,245	1,204,331
Residential Real Estate [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,540	2,819
Home equity - junior lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	141,929	143,390
Home equity - junior lien [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	141,830	143,112
Home equity - junior lien [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	99	278
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	42,320	46,402
Consumer [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	42,319	46,353
Consumer [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1	49
Demand Deposit Account Overdrafts [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	4,001	3,905
Demand Deposit Account Overdrafts [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	4,001	3,900
Demand Deposit Account Overdrafts [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	5
Noncommercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,403,035	1,400,847
Noncommercial Loans [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,401,395	1,397,696
Noncommercial Loans [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 1,640	$ 3,151