Derivative Financial Instruments (Interest Rate Swaps And Caps Not Designated For Hedge Accounting) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Derivative [Line Items]
Notional Amount	$ 1,581,951	$ 1,403,512
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Gain	12,846	544
Derivative Asset, Loss	(26,840)	(41,965)
Not Designated as Hedging Instrument [Member] | Customer Position [Member]
Derivative [Line Items]
Number of Instruments	219	201
Notional Amount	1,382,011	1,203,569
Derivative Asset, Gain	33,028	50,969
Derivative Liability, Loss	(8,379)	(124)
Net	24,649	50,845
Not Designated as Hedging Instrument [Member] | Customer Position [Member] | Other Assets [Member]
Derivative [Line Items]
Number of Instruments	153	178
Notional Amount	820,055	1,009,623
Derivative Asset, Gain	33,028	50,969
Derivative Asset, Loss	0	0
Net	33,028	50,969
Not Designated as Hedging Instrument [Member] | Customer Position [Member] | Other Liabilities [Member]
Derivative [Line Items]
Number of Instruments	66	23
Notional Amount	561,956	193,946
Derivative Liability, Gain	0	0
Derivative Liability, Loss	(8,379)	(124)
Net	(8,379)	(124)
Not Designated as Hedging Instrument [Member] | Counterparty Position [Member]
Derivative [Line Items]
Number of Instruments	212	194
Notional Amount	1,381,951	1,203,512
Derivative Asset, Gain	12,846	544
Derivative Liability, Loss	(26,840)	(41,965)
Net	(13,994)	(41,421)
Not Designated as Hedging Instrument [Member] | Counterparty Position [Member] | Other Assets [Member]
Derivative [Line Items]
Number of Instruments	26
Notional Amount	266,320
Derivative Asset, Gain	3,151
Derivative Asset, Loss	(710)
Net	2,441
Not Designated as Hedging Instrument [Member] | Counterparty Position [Member] | Other Liabilities [Member]
Derivative [Line Items]
Number of Instruments	186	194
Notional Amount	1,115,631	1,203,512
Derivative Liability, Gain	9,695	544
Derivative Liability, Loss	(26,130)	(41,965)
Net	$ (16,435)	$ (41,421)