Fair Value (Schedule Of Carrying Values And Estimated Fair Values Of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Held-to-maturity, fair value	$ 643,926	$ 609,547
Time deposits	2,500,303	2,593,038
Long-term debt (less fair value hedges)	1,933,136	2,273,575
Carrying Value [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Held-to-maturity, fair value	615,104	588,981
Loans and leases (including loans held for sale), net of allowance	39,118,830	38,468,402
Time deposits	2,500,303	2,593,038
Foreign deposits	252,207	1,980,161
Long-term debt (less fair value hedges)	1,930,649	2,269,762
Estimated Fair Value [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Held-to-maturity, fair value	643,926	609,547
Loans and leases (including loans held for sale), net of allowance	38,777,966	38,088,242
Time deposits	2,507,425	2,602,955
Foreign deposits	252,323	1,979,805
Long-term debt (less fair value hedges)	$ 2,072,925	$ 2,423,643