Commitments, Guarantees, And Contingent Liabilities (Schedule Of Guarantees Issued) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Commitments To Extend Credit	$ 15,003,402	$ 14,277,347
Commercial Letters Of Credit	93,954	91,978
Financial [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Standby letters of credit	818,076	774,427
Performance [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Standby letters of credit	$ 212,369	$ 190,029