Allowance For Loan Losses (Schedule Of Non-Commercial Loans By Payment Performance) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Total	$ 2,558,456	$ 2,146,369
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,188,841	1,031,435
Residential Real Estate [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,185,616	1,029,142
Residential Real Estate [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,225	2,293
Home equity - junior lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	140,887	143,110
Home equity - junior lien [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	140,769	141,961
Home equity - junior lien [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	118	1,149
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	50,757	36,564
Consumer [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	50,710	36,564
Consumer [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	47	0
DDA Overdrafts [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	4,508	4,551
DDA Overdrafts [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	4,506	4,548
DDA Overdrafts [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2	3
Noncommercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,384,993	1,215,660
Noncommercial Loans [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,381,601	1,212,215
Noncommercial Loans [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 3,392	$ 3,445