Loans And Leases (Commercial, Commercial Real Estate Loans And Equipment Financing Loans Segregated By Risk Rating Exposure) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Credit risk exposure	$ 12,514,477	[1]	$ 12,064,056	[1]
Total recorded investment	371,674		404,161
Commerial, commercial real estate, equipment financing TDR's [Member]
Financing Receivable, Impaired [Line Items]
Total recorded investment	175,232		202,424
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	3,196,387		2,913,186
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	2,991,432		2,790,602
Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	425,827		419,311
(1) - (6) Pass [Member] | Commerial, commercial real estate, equipment financing TDR's [Member]
Financing Receivable, Impaired [Line Items]
Total recorded investment	56,456		56,661
(1) - (6) Pass [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	2,990,708		2,701,061
(1) - (6) Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	2,865,921		2,588,987
(1) - (6) Pass [Member] | Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	403,943		381,304
(7) Special Mention [Member] | Commerial, commercial real estate, equipment financing TDR's [Member]
Financing Receivable, Impaired [Line Items]
Total recorded investment	0		0
(7) Special Mention [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	74,439		43,856
(7) Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	9,535		56,023
(7) Special Mention [Member] | Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	7,466		12,893
(8) Substandard [Member] | Commerial, commercial real estate, equipment financing TDR's [Member]
Financing Receivable, Impaired [Line Items]
Total recorded investment	118,353		143,903
(8) Substandard [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	130,301		167,485
(8) Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	115,434		143,904
(8) Substandard [Member] | Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	14,418		25,114
(9) Doubtful [Member] | Commerial, commercial real estate, equipment financing TDR's [Member]
Financing Receivable, Impaired [Line Items]
Total recorded investment	423		1,860
(9) Doubtful [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	939		784
(9) Doubtful [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	542		1,688
(9) Doubtful [Member] | Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	0		0
(10) Loss [Member] | Commerial, commercial real estate, equipment financing TDR's [Member]
Financing Receivable, Impaired [Line Items]
Total recorded investment	0		0
(10) Loss [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	0		0
(10) Loss [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	0		0
(10) Loss [Member] | Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	$ 0		$ 0

[1] Loans and leases include net deferred fees and unamortized premiums of $13.2 million and $12.7 million at September 30, 2013 and December 31, 2012, respectively.