Allowance For Loan Losses (Schedule Of Non-Commercial Loans By Payment Performance) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Total	$ 2,630,742	$ 2,606,197
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,274,062	1,204,450
Residential Real Estate [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,271,767	1,201,631
Residential Real Estate [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,295	2,819
Home equity - junior lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	146,965	146,090
Home equity - junior lien [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	146,689	145,812
Home equity - junior lien [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	276	278
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	41,042	46,402
Consumer [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	41,001	46,353
Consumer [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	41	49
Demand Deposit Account Overdrafts [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,618	3,905
Demand Deposit Account Overdrafts [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,617	3,900
Demand Deposit Account Overdrafts [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 1	$ 5