Other Real Estate Owned (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Other Real Estate Owned Rollforward [Line Items]
Other Real Estate Owned Beginning Balance	$ 303,508	$ 405,902
Other Real Estate Owned Write Downs	(5,653)	(15,665)
Other Real Estate Owned Additions	37,236	86,934
Other Real Estate Owned Sales	(37,823)	(149,083)
Othe Real Estate Owned Other Adjustments	(1,556)	(1,011)
Other Real Estate Owned Ending Balance	295,712	327,077
Non Covered Under Loss Sharing Agreements With F D I C [Member] | Mortgages [Member]
Other Real Estate Owned Rollforward [Line Items]
Other Real Estate Owned Beginning Balance	86,852	130,982
Other Real Estate Owned Write Downs	(669)	(7,358)
Other Real Estate Owned Additions	14,883	24,848
Other Real Estate Owned Sales	(12,063)	(72,017)
Othe Real Estate Owned Other Adjustments	(179)	(902)
Other Real Estate Owned Ending Balance	88,824	75,553
Non Covered Under Loss Sharing Agreements With F D I C [Member] | Commercial Or Construction [Member]
Other Real Estate Owned Rollforward [Line Items]
Other Real Estate Owned Beginning Balance	48,649	135,862
Other Real Estate Owned Write Downs	(214)	(4,899)
Other Real Estate Owned Additions	4,668	18,318
Other Real Estate Owned Sales	(4,962)	(70,135)
Othe Real Estate Owned Other Adjustments	0	0
Other Real Estate Owned Ending Balance	48,141	79,146
Covered Under Loss Sharing Agreements With F D I C [Member] | Mortgages [Member]
Other Real Estate Owned Rollforward [Line Items]
Other Real Estate Owned Beginning Balance	47,792	39,660
Other Real Estate Owned Write Downs	(207)	(303)
Other Real Estate Owned Additions	4,491	8,973
Other Real Estate Owned Sales	(2,377)	(5,256)
Othe Real Estate Owned Other Adjustments	(1,285)	(109)
Other Real Estate Owned Ending Balance	48,414	42,965
Covered Under Loss Sharing Agreements With F D I C [Member] | Commercial Or Construction [Member]
Other Real Estate Owned Rollforward [Line Items]
Other Real Estate Owned Beginning Balance	120,215	99,398
Other Real Estate Owned Write Downs	(4,563)	(3,105)
Other Real Estate Owned Additions	13,194	34,795
Other Real Estate Owned Sales	(18,421)	(1,675)
Othe Real Estate Owned Other Adjustments	(92)	0
Other Real Estate Owned Ending Balance	$ 110,333	$ 129,413