Commitments, Contingencies And Guarantees (Schedule Of Off-Balance Sheet Instruments Commitments) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Commercial letters of credit	$ 4,498	$ 2,962
Credit Card [Member]
Commitments to extend credit	5,102,556	4,932,955
Other [Member]
Commitments to extend credit	5,737,181	5,508,686
Financial Standby Letter of Credit [Member]
Standby letters of credit, net of participations	$ 387,811	$ 391,899