Commitments, Guarantees, And Contingent Liabilities (Schedule Of Guarantees Issued) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Unused Commitments to Extend Credit	$ 16,678,282	$ 16,658,757
Commercial Letters Of Credit	37,674	32,144
Total Unfunded Lending Commitments	17,587,359	17,620,278
Financial [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Standby letters of credit	677,693	745,895
Performance [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Standby letters of credit	$ 193,710	$ 183,482