Allowance For Loan Losses (Schedule Of Non-Commercial Loans By Payment Performance) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Total	$ 2,497,023	$ 2,146,369
Noncommercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,345,893	1,215,660
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,149,411	1,031,435
Home equity - junior lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	138,333	143,110
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	55,274	36,564
DDA Overdrafts [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,875	4,551
Performing [Member] | Noncommercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,342,451	1,212,215
Performing [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,146,028	1,029,142
Performing [Member] | Home equity - junior lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	138,275	141,961
Performing [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	55,273	36,564
Performing [Member] | DDA Overdrafts [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,875	4,548
Non-Performing [Member] | Noncommercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,442	3,445
Non-Performing [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,383	2,293
Non-Performing [Member] | Home equity - junior lien [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	58	1,149
Non-Performing [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1
Non-Performing [Member] | DDA Overdrafts [Member]
Financing Receivable, Recorded Investment [Line Items]
Total		$ 3