Derivative Financial Instruments (Interest Rate Swaps And Caps Not Designated For Hedge Accounting) (Detail) (Not Designated as Hedging Instrument [Member], USD $)	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Derivative asset, Estimated Fair Value, Gain	$ 17,062,000	$ 544,000
Derivative Asset, Estimated Fair Value, Loss	(23,087,000)	(42,090,000)
Customer Position [Member]
Derivative [Line Items]
Number of Instruments	235	201
Notional Amount	1,563,728,000	1,203,569,000
Derivative asset, Estimated Fair Value, Gain	29,004,000	50,970,000
Derivative liability, Estimated Fair Value, Loss	(11,175,000)	(124,000)
Net	17,829,000	50,846,000
Customer Position [Member] | Other Assets [Member]
Derivative [Line Items]
Number of Instruments	159	178
Notional Amount	915,272,000	1,009,623,000
Derivative asset, Estimated Fair Value, Gain	29,004,000	50,970,000
Derivative Asset, Estimated Fair Value, Loss	0	0
Net	29,004,000	50,970,000
Customer Position [Member] | Other Liabilities [Member]
Derivative [Line Items]
Number of Instruments	76	23
Notional Amount	648,456,000	193,946,000
Derivative liability, Estimated Fair Value, Gain	0	0
Derivative liability, Estimated Fair Value, Loss	(11,175,000)	(124,000)
Net	(11,175,000)	(124,000)
Counterparty Position [Member]
Derivative [Line Items]
Number of Instruments	229	194,000
Notional Amount	1,563,667,000	1,203,512,000
Derivative asset, Estimated Fair Value, Gain	17,062,000	544,000
Derivative liability, Estimated Fair Value, Loss	(22,860,000)	(41,965,000)
Net	(5,798,000)	(41,421,000)
Counterparty Position [Member] | Other Assets [Member]
Derivative [Line Items]
Number of Instruments	111
Notional Amount	914,044,000
Derivative asset, Estimated Fair Value, Gain	8,944,000
Derivative Asset, Estimated Fair Value, Loss	(2,766,000)
Net	6,178,000
Counterparty Position [Member] | Other Liabilities [Member]
Derivative [Line Items]
Number of Instruments	118	194,000
Notional Amount	649,623,000	1,203,512,000
Derivative liability, Estimated Fair Value, Gain	8,118,000	544,000
Derivative liability, Estimated Fair Value, Loss	(20,094,000)	(41,965,000)
Net	$ (11,976,000)	$ (41,421,000)