Note Other Real Estate Owned (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015		Jun. 30, 2016	Jun. 30, 2015
Other Real Estate Owned Rollforward [Line Items]
Other Real Estate Owned Beginning Balance	$ 202,357	$ 241,727		$ 191,916	$ 265,766
Other Real Estate Owned Write Downs	(2,548)	(18,973)		(6,774)	(36,909)
Additions	38,166	35,827		68,735	68,356
Other Real Estate Owned Sales	(22,695)	(83,202)		(36,439)	(121,001)
Other adjustments	(271)	380		(2,429)	(453)
Transfer to non-covered status		0	[1]		0	[2]
Other Real Estate Owned Ending Balance	215,009	175,759		215,009	175,759
Non-covered loans | Mortgages
Other Real Estate Owned Rollforward [Line Items]
Other Real Estate Owned Beginning Balance	135,606	102,562		122,760	96,517
Other Real Estate Owned Write Downs	(1,621)	(2,463)		(3,630)	(3,835)
Additions	31,624	18,532		55,900	39,607
Other Real Estate Owned Sales	(12,403)	(14,243)		(20,903)	(27,329)
Other adjustments	(291)	50		(1,212)	(522)
Transfer to non-covered status		3,092	[1]		3,092	[2]
Other Real Estate Owned Ending Balance	152,915	107,530		152,915	107,530
Non-covered loans | Commercial / Construction
Other Real Estate Owned Rollforward [Line Items]
Other Real Estate Owned Beginning Balance	30,354	25,608		32,471	38,983
Other Real Estate Owned Write Downs	(561)	(4,162)		(2,278)	(10,049)
Additions	1,302	2,793		3,112	4,828
Other Real Estate Owned Sales	(6,985)	(4,868)		(8,580)	(14,295)
Other adjustments	0	850		(615)	754
Transfer to non-covered status		14,504	[1]		14,504	[2]
Other Real Estate Owned Ending Balance	24,110	34,725		24,110	34,725
Covered loans | Mortgages
Other Real Estate Owned Rollforward [Line Items]
Other Real Estate Owned Beginning Balance	36,397	42,984		36,685	44,872
Other Real Estate Owned Write Downs	(366)	(1,393)		(866)	(2,675)
Additions	5,240	8,879		9,723	14,260
Other Real Estate Owned Sales	(3,307)	(13,806)		(6,956)	(19,628)
Other adjustments	20	(68)		(602)	(233)
Transfer to non-covered status		(3,092)	[1]		(3,092)	[2]
Other Real Estate Owned Ending Balance	$ 37,984	33,504		$ 37,984	33,504
Covered loans | Commercial / Construction
Other Real Estate Owned Rollforward [Line Items]
Other Real Estate Owned Beginning Balance		70,573			85,394
Other Real Estate Owned Write Downs		(10,955)			(20,350)
Additions		5,623			9,661
Other Real Estate Owned Sales		(50,285)			(59,749)
Other adjustments		(452)			(452)
Transfer to non-covered status		(14,504)	[1]		(14,504)	[2]
Other Real Estate Owned Ending Balance		$ 0			$ 0

[1] Represents the reclassification of OREOs to the non-covered category, pursuant to the expiration of the commercial and consumer shared-loss arrangement with the FDIC related to loans acquired from Westernbank, on June 30, 2015.

[2] Represents the reclassification of OREOs to the non-covered category, pursuant to the expiration of the commercial and consumer shared-loss arrangement with the FDIC related to loans acquired from Westernbank, on June 30, 2015.