Commitments, Contingencies And Guarantees (Schedule Of Off-Balance Sheet Instruments Commitments) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Commercial letters of credit	$ 13,774	$ 4,498
Credit Card [Member]
Commitments to extend credit	5,328,502	5,102,556
Other [Member]
Commitments to extend credit	5,840,967	5,737,181
Financial Standby Letter of Credit [Member]
Standby letters of credit, net of participations	$ 353,905	$ 387,811