Commitments, Guarantees, And Contingent Liabilities (Schedule Of Guarantees Issued) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Commitments To Extend Credit	$ 15,561,565	$ 14,277,347
Commercial Letters Of Credit	62,832	91,978
Total Unfunded Lending Commitments	16,615,998	15,333,781
Financial [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Standby letters of credit	812,493	774,427
Performance [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Standby letters of credit	$ 179,108	$ 190,029