Fair Value (Schedule Of Carrying Values And Estimated Fair Values Of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Held-to-maturity, fair value	$ 602,355	$ 677,196
Time deposits	2,344,818us-gaap_TimeDeposits	2,406,924us-gaap_TimeDeposits
Long-term debt (less fair value hedges)	1,089,321us-gaap_LongTermDebt	1,092,282us-gaap_LongTermDebt
Carrying Value [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Held-to-maturity, fair value	590,950	647,252
Loans and leases (including loans held for sale), net of allowance	39,689,047	39,591,499
Time deposits	2,344,818	2,406,924
Foreign deposits	382,985	328,391
Long-term debt (less fair value hedges)	1,088,285	1,090,778
Estimated Fair Value [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Held-to-maturity, fair value	602,355	677,196
Loans and leases (including loans held for sale), net of allowance	39,573,365	39,426,498
Time deposits	2,349,454	2,408,550
Foreign deposits	382,873	328,447
Long-term debt (less fair value hedges)	$ 1,149,869	$ 1,159,287

The aggregate of all foreign interest-bearing and noninterest-bearing deposit liabilities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 235

-Section S99

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- Definition

Fair value of investments in debt securities classified as held-to-maturity.

+ References

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

+ References

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

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