Allowance For Loan Losses (Schedule Of Non-Commercial Loans By Payment Performance) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Total	$ 2,684,457	$ 2,652,066
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,325,453	1,294,576
Residential Real Estate [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,322,548	1,292,012
Residential Real Estate [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,905	2,564
Home equity - junior lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	143,772	145,604
Home equity - junior lien [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	143,628	145,506
Home equity - junior lien [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	144	98
Consumer Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	37,555	39,705
Consumer Loan [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	37,505	39,692
Consumer Loan [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	50	13
Demand Deposit Account Overdrafts [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,279	2,802
Demand Deposit Account Overdrafts [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,279	2,802
Demand Deposit Account Overdrafts [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Noncommercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,510,059	1,482,687
Noncommercial Loans [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,506,960	1,480,012
Noncommercial Loans [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 3,099	$ 2,675