Loans And Allowance For Loan Losses (Allowance For Loan Losses And Related Loan Balance Disaggregated On The Basis Of Impairment Methodology) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Impaired loans	$ 10,758	$ 9,370
Impaired loans	139,255	145,360
Allowance For Loan Losses [Member]
Impaired loans	10,758	9,370
All other loans	173,774	188,168
Loans Outstanding [Member]
Impaired loans	139,255	145,360
All other loans	9,038,223	9,265,622
Personal Banking [Member] | Allowance For Loan Losses [Member]
Impaired loans	4,090	3,243
All other loans	57,945	74,349
Personal Banking [Member] | Loans Outstanding [Member]
Impaired loans	31,088	26,828
All other loans	3,771,427	3,900,421
Commercial [Member] | Allowance For Loan Losses [Member]
Impaired loans	6,668	6,127
All other loans	115,829	113,819
Commercial [Member] | Loans Outstanding [Member]
Impaired loans	108,167	118,532
All other loans	$ 5,266,796	$ 5,365,201