Allowance For Loan Losses (Schedule Of Non-Commercial Loans By Payment Performance) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Financing Receivable, Recorded Investment [Line Items]
Total	$ 2,527,445	$ 2,146,369	$ 2,146,369
Noncommercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,365,835	1,215,660
Noncommercial Loans [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,353,814	1,212,215
Noncommercial Loans [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	12,021	3,445
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,170,123	1,031,435	1,031,435
Residential Real Estate [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,159,816	1,029,142
Residential Real Estate [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	10,307	2,293
Home equity - junior lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	138,367	143,110	143,110
Home equity - junior lien [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	137,683	141,961
Home equity - junior lien [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	684	1,149
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	54,242	36,564	36,564
Consumer [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	53,502	36,564
Consumer [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	740	0
DDA Overdrafts [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,103	4,551	4,551
DDA Overdrafts [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,813	4,548
DDA Overdrafts [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 290	$ 3