Loans And Leases (Recorded Investment In Loans And Leases) (Detail) (USD $)	Dec. 31, 2013		Dec. 31, 2012
Schedule Of Recorded Investment In Loans And Leases [Line Items]
Individually evaluated for impairment	$ 352,505,000	[1]	$ 428,121,000	[1]
Collectively evaluated for impairment	12,383,704,000	[1]	11,635,935,000	[1]
Recorded investment in loans and leases	12,736,209,000	[1]	12,064,056,000	[1]
Less: Accrued interest	36,433,000	[1]	35,360,000	[1]
Loans and leases	12,699,776,000	[1]	12,028,696,000	[1]
Net deferred fees and unamortized premiums	13,300,000		12,700,000
Residential [Member]
Schedule Of Recorded Investment In Loans And Leases [Line Items]
Individually evaluated for impairment	142,871,000		146,944,000
Collectively evaluated for impairment	3,228,688,000		3,155,051,000
Recorded investment in loans and leases	3,371,559,000		3,301,995,000
Less: Accrued interest	10,134,000		10,271,000
Loans and leases	3,361,425,000		3,291,724,000
Consumer [Member]
Schedule Of Recorded Investment In Loans And Leases [Line Items]
Individually evaluated for impairment	52,179,000		54,793,000
Collectively evaluated for impairment	2,492,353,000		2,584,169,000
Recorded investment in loans and leases	2,544,532,000		2,638,962,000
Less: Accrued interest	7,844,000		8,095,000
Loans and leases	2,536,688,000		2,630,867,000
Commercial [Member]
Schedule Of Recorded Investment In Loans And Leases [Line Items]
Individually evaluated for impairment	52,199,000		69,426,000
Collectively evaluated for impairment	3,241,045,000		2,843,760,000
Recorded investment in loans and leases	3,293,244,000		2,913,186,000
Less: Accrued interest	10,393,000		9,453,000
Loans and leases	3,282,851,000		2,903,733,000
Commercial Real Estate [Member]
Schedule Of Recorded Investment In Loans And Leases [Line Items]
Individually evaluated for impairment	105,046,000	[2]	154,978,000	[2]
Collectively evaluated for impairment	2,961,378,000	[2]	2,635,624,000	[2]
Recorded investment in loans and leases	3,066,424,000	[2]	2,790,602,000	[2]
Less: Accrued interest	8,062,000	[2]	7,541,000	[2]
Loans and leases	3,058,362,000	[2]	2,783,061,000	[2]
Equipment Financing [Member]
Schedule Of Recorded Investment In Loans And Leases [Line Items]
Individually evaluated for impairment	210,000		1,980,000
Collectively evaluated for impairment	460,240,000		417,331,000
Recorded investment in loans and leases	460,450,000		419,311,000
Less: Accrued interest	0		0
Loans and leases	$ 460,450,000		$ 419,311,000

[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.

[2] Includes certain loans individually evaluated for impairment, under the Company's loan policy, that were deemed not to be impaired at both December 31, 2013 and December 31, 2012.