Loans (Schedule Of Recorded Investment In Loan Classes Based On Payment Activity) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Total [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 3,664,318	$ 3,377,590
Total [Member] | Performing Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	3,628,762	3,346,549
Total [Member] | Non-Performing Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	35,556	31,041
Residential Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,285,590	1,925,430
Residential Mortgage [Member] | Performing Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,253,944	1,896,936
Residential Mortgage [Member] | Non-Performing Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	31,646	28,494
Home Equity [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	469,604	512,745
Home Equity [Member] | Performing Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	466,904	510,790
Home Equity [Member] | Non-Performing Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,700	1,955
Automobile [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	772,490	850,801
Automobile [Member] | Performing Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	772,029	850,262
Automobile [Member] | Non-Performing Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	461	539
Other Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	136,634	88,614
Other Consumer [Member] | Performing Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	135,885	88,561
Other Consumer [Member] | Non-Performing Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 749	$ 53