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, 2014		Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Recorded investment	$ 13,552,153	[1]	$ 12,736,209	[1]
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	3,643,735		3,293,244
Commercial Portfolio Segment [Member] | (1) - (6) Pass [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	3,474,698		3,091,154
Commercial Portfolio Segment [Member] | (7) Special Mention [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	63,830		87,451
Commercial Portfolio Segment [Member] | (8) Substandard [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	105,008		114,199
Commercial Portfolio Segment [Member] | (9) Doubtful [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	199		440
Commercial Portfolio Segment [Member] | (10) Loss [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	0		0
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	3,362,458	[2]	3,066,424	[2]
Commercial Real Estate [Member] | (1) - (6) Pass [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	3,191,834		2,947,116
Commercial Real Estate [Member] | (7) Special Mention [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	61,354		20,901
Commercial Real Estate [Member] | (8) Substandard [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	108,762		97,822
Commercial Real Estate [Member] | (9) Doubtful [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	508		585
Commercial Real Estate [Member] | (10) Loss [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	0		0
Finance Leases Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	490,150		460,450
Finance Leases Portfolio Segment [Member] | (1) - (6) Pass [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	468,407		437,033
Finance Leases Portfolio Segment [Member] | (7) Special Mention [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	2,080		7,979
Finance Leases Portfolio Segment [Member] | (8) Substandard [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	19,663		15,438
Finance Leases Portfolio Segment [Member] | (9) Doubtful [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	0		0
Finance Leases Portfolio Segment [Member] | (10) Loss [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	$ 0		$ 0

[1] Loans and leases include net deferred fees and unamortized premiums of $14.5 million and $13.3 million at September 30, 2014 and December 31, 2013, respectively.

[2] Includes certain loans individually evaluated for impairment under the Company's loan policy that were deemed not to be impaired at both September 30, 2014 and December 31, 2013.