Loans And Leases (Recorded Investment In Loans And Leases) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Loans and leases	$ 12,246,293	[1]	$ 12,028,696	[1]
Accrued interest	36,688		35,360
Recorded investment	12,282,981		12,064,056
Total recorded investment: individually evaluated for impairment	413,268		428,121
Total recorded investment: collectively evaluated for impairment	11,869,713		11,635,935
Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases	3,313,833	[1]	3,291,724	[1]
Accrued interest	10,147		10,271
Recorded investment	3,323,980		3,301,995
Total recorded investment: individually evaluated for impairment	146,486		146,944
Total recorded investment: collectively evaluated for impairment	3,177,494		3,155,051
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases	2,557,719	[1]	2,630,867	[1]
Accrued interest	7,855		8,095
Recorded investment	2,565,574		2,638,962
Total recorded investment: individually evaluated for impairment	53,706		54,793
Total recorded investment: collectively evaluated for impairment	2,511,868		2,584,169
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases	3,107,269	[1]	2,903,733	[1]
Accrued interest	10,953		9,453
Recorded investment	3,118,222		2,913,186
Total recorded investment: individually evaluated for impairment	64,078		69,426
Total recorded investment: collectively evaluated for impairment	3,054,144		2,843,760
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases	2,866,814	[1]	2,783,061	[1]
Accrued interest	7,733		7,541
Recorded investment	2,874,547		2,790,602
Total recorded investment: individually evaluated for impairment	148,613		154,978
Total recorded investment: collectively evaluated for impairment	2,725,934		2,635,624
Equipment financing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases	400,658	[1]	419,311	[1]
Accrued interest	0		0
Recorded investment	400,658		419,311
Total recorded investment: individually evaluated for impairment	385		1,980
Total recorded investment: collectively evaluated for impairment	$ 400,273		$ 417,331

[1] The ending balance includes net deferred fees and unamortized premiums of $12.5 million and $12.7 million at June 30, 2013 and December 31, 2012, respectively.