Loans And Leases (Commercial, Commercial Real Estate Loans And Equipment Financing Loans Segregated By Risk Rating Exposure) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Risk Rating Exposure [ Line Items]
Total	$ 12,736,209	[1]	$ 12,064,056	[1]
Total	341,898		404,161
Commerial, Commercial Real Estate, Equipment Financing TDR's [Member]
Risk Rating Exposure [ Line Items]
Total	146,848		202,424
Commerial, Commercial Real Estate, Equipment Financing TDR's [Member] | Pass [Member]
Risk Rating Exposure [ Line Items]
Total	55,973		56,661
Commerial, Commercial Real Estate, Equipment Financing TDR's [Member] | Special Mention [Member]
Risk Rating Exposure [ Line Items]
Total	0		0
Commerial, Commercial Real Estate, Equipment Financing TDR's [Member] | Substandard [Member]
Risk Rating Exposure [ Line Items]
Total	90,461		143,903
Commerial, Commercial Real Estate, Equipment Financing TDR's [Member] | Doubtful [Member]
Risk Rating Exposure [ Line Items]
Total	414		1,860
Commerial, Commercial Real Estate, Equipment Financing TDR's [Member] | Loss [Member]
Risk Rating Exposure [ Line Items]
Total	0		0
Commercial [Member]
Risk Rating Exposure [ Line Items]
Total	3,293,244		2,913,186
Commercial [Member] | Pass [Member]
Risk Rating Exposure [ Line Items]
Total	3,091,154		2,701,061
Commercial [Member] | Special Mention [Member]
Risk Rating Exposure [ Line Items]
Total	87,451		43,856
Commercial [Member] | Substandard [Member]
Risk Rating Exposure [ Line Items]
Total	114,199		167,485
Commercial [Member] | Doubtful [Member]
Risk Rating Exposure [ Line Items]
Total	440		784
Commercial [Member] | Loss [Member]
Risk Rating Exposure [ Line Items]
Total	0		0
Commercial Real Estate [Member]
Risk Rating Exposure [ Line Items]
Total	3,066,424		2,790,602
Commercial Real Estate [Member] | Pass [Member]
Risk Rating Exposure [ Line Items]
Total	2,947,116		2,588,987
Commercial Real Estate [Member] | Special Mention [Member]
Risk Rating Exposure [ Line Items]
Total	20,901		56,023
Commercial Real Estate [Member] | Substandard [Member]
Risk Rating Exposure [ Line Items]
Total	97,822		143,904
Commercial Real Estate [Member] | Doubtful [Member]
Risk Rating Exposure [ Line Items]
Total	585		1,688
Commercial Real Estate [Member] | Loss [Member]
Risk Rating Exposure [ Line Items]
Total	0		0
Equipment Financing [Member]
Risk Rating Exposure [ Line Items]
Total	460,450		419,311
Equipment Financing [Member] | Pass [Member]
Risk Rating Exposure [ Line Items]
Total	437,033		381,304
Equipment Financing [Member] | Special Mention [Member]
Risk Rating Exposure [ Line Items]
Total	7,979		12,893
Equipment Financing [Member] | Substandard [Member]
Risk Rating Exposure [ Line Items]
Total	15,438		25,114
Equipment Financing [Member] | Doubtful [Member]
Risk Rating Exposure [ Line Items]
Total	0		0
Equipment Financing [Member] | Loss [Member]
Risk Rating Exposure [ Line Items]
Total	$ 0		$ 0

[1] Loans and leases include net deferred fees and unamortized premiums of $13.3 million and $12.7 million at December 31, 2013 and December 31, 2012, respectively.