Loans And Leases (Commercial, Commercial Real Estate Loans And Equipment Financing Loans Segregated By Risk Rating Exposure) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Credit risk exposure	$ 12,282,981	$ 12,064,056
Total recorded investment	391,130	404,161
Commerial, Commercial Real Estate, Equipment Financing TDR's [Member]
Financing Receivable, Impaired [Line Items]
Total recorded investment	190,939	202,424
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	2,874,547	2,790,602
Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	400,658	419,311
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	3,118,222	2,913,186
Pass [Member]
Financing Receivable, Impaired [Line Items]
Total recorded investment	60,582	56,661
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	2,714,549	2,588,987
Pass [Member] | Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	376,433	381,304
Pass [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	2,885,779	2,701,061
Special Mention [Member]
Financing Receivable, Impaired [Line Items]
Total recorded investment	4,745	0
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	25,702	56,023
Special Mention [Member] | Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	9,501	12,893
Special Mention [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	90,482	43,856
Substandard [Member]
Financing Receivable, Impaired [Line Items]
Total recorded investment	125,211	143,903
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	133,826	143,904
Substandard [Member] | Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	14,724	25,114
Substandard [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	139,644	167,485
Doubtful [Member]
Financing Receivable, Impaired [Line Items]
Total recorded investment	401	1,860
Doubtful [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	470	1,688
Doubtful [Member] | Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	0	0
Doubtful [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	2,317	784
Loss [Member]
Financing Receivable, Impaired [Line Items]
Total recorded investment	0	0
Loss [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	0	0
Loss [Member] | Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	0	0
Loss [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Credit risk exposure	$ 0	$ 0