Allowance For Loan Losses (Schedule Of Non-Commercial Loans By Payment Performance) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Total	$ 2,632,471	$ 2,652,066
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,303,258	1,294,576
Residential Real Estate [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,300,714	1,292,012
Residential Real Estate [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,544	2,564
Home equity - junior lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	143,670	145,604
Home equity - junior lien [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	143,577	145,506
Home equity - junior lien [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	93	98
Consumer Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	38,436	39,705
Consumer Loan [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	38,344	39,692
Consumer Loan [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	92	13
Demand Deposit Account Overdrafts [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,203	2,802
Demand Deposit Account Overdrafts [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,203	2,802
Demand Deposit Account Overdrafts [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 0	$ 0