Derivative Financial Instruments (Interest Rate Swaps And Caps Not Designated For Hedge Accounting) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Derivative [Line Items]
Notional Outstanding	$ 1,340,819		$ 1,403,512
Total Gain (Loss)	(7,611)		(43,048)
Counterparty Position [Member]
Derivative [Line Items]
Number of Instruments	205		194
Notional Outstanding	1,290,819		1,203,512
Gain	15,412		544
Derivative Liability, Fair Value, Gross Liability	(26,079)		(41,965)
Total Gain (Loss)	(10,667)		(41,421)
Counterparty Position [Member] | Other Assets [Member]
Derivative [Line Items]
Number of Instruments	79
Notional Outstanding	562,195
Counterparty Position [Member] | Other Liabilities [Member]
Derivative [Line Items]
Number of Instruments	126		194
Notional Outstanding	728,624		1,203,512
Customer Position [Member]
Derivative [Line Items]
Number of Instruments	212		201
Notional Outstanding	1,291,078		1,203,569
Gain	30,676		50,969
Derivative Liability, Fair Value, Gross Liability	(10,200)		(124)
Total Gain (Loss)	20,476		50,845
Customer Position [Member] | Other Assets [Member]
Derivative [Line Items]
Number of Instruments	140		178
Notional Outstanding	702,154		1,009,623
Customer Position [Member] | Other Liabilities [Member]
Derivative [Line Items]
Number of Instruments	72		23
Notional Outstanding	588,924		193,946
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain	15,412	[1]	544	[1]
Derivative Asset, Fair Value, Gross Liability	26,079	[1]	41,965	[1]
Total Gain (Loss)	(10,667)	[1]	(41,421)	[1]
Not Designated as Hedging Instrument [Member] | Counterparty Position [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Asset	8,673		544
Derivative Liability, Fair Value, Gross Liability	(22,906)		(41,965)
Derivative Asset, Fair Value, Gross Liability	(3,173)
Not Designated as Hedging Instrument [Member] | Counterparty Position [Member] | Other Assets [Member]
Derivative [Line Items]
Gain	6,739
Total Gain (Loss)	3,566
Not Designated as Hedging Instrument [Member] | Counterparty Position [Member] | Other Liabilities [Member]
Derivative [Line Items]
Total Gain (Loss)	(14,233)		(41,421)
Not Designated as Hedging Instrument [Member] | Customer Position [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Asset	0		0
Gain	30,676		50,969
Derivative Liability, Fair Value, Gross Liability	(10,200)		(124)
Derivative Asset, Fair Value, Gross Liability	0		0
Not Designated as Hedging Instrument [Member] | Customer Position [Member] | Other Assets [Member]
Derivative [Line Items]
Total Gain (Loss)	30,676		50,969
Not Designated as Hedging Instrument [Member] | Customer Position [Member] | Other Liabilities [Member]
Derivative [Line Items]
Total Gain (Loss)	$ (10,200)		$ (124)

[1] Net gain (loss) position recorded in other assets (liabilities)