Commitments, Guarantees, And Contingent Liabilities (Schedule Of Guarantees Issued) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Commitments To Extend Credit	$ 16,443,367	$ 16,174,326
Commercial Letters Of Credit	72,806	80,218
Total Unfunded Lending Commitments	17,508,637	17,193,840
Financial [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Standby letters of credit	812,011	779,811
Performance [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Standby letters of credit	$ 180,453	$ 159,485