Note Other Real Estate Owned (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2017		Sep. 30, 2016	Sep. 30, 2017		Sep. 30, 2016
Other Real Estate Owned Rollforward [Line Items]
Other Real Estate Owned Beginning Balance	$ 206,446		$ 215,009	$ 212,573		$ 191,916
Other Real Estate Owned Write Downs	(5,792)		(3,781)	(22,376)		(10,555)
Additions	21,211		33,955	87,964		102,690
Other Real Estate Owned Sales	(23,323)		(22,721)	(78,959)		(59,160)
Other adjustments	(269)		(220)	(929)		(2,649)
Other Real Estate Owned Ending Balance	198,273		222,242	198,273		222,242
Non-covered loans | Mortgages
Other Real Estate Owned Rollforward [Line Items]
Other Real Estate Owned Beginning Balance	157,147		152,915	160,044		122,760
Other Real Estate Owned Write Downs	(2,856)	[1]	(2,859)	(14,715)	[2]	(6,489)
Additions	18,669		27,355	69,585		83,255
Other Real Estate Owned Sales	(18,185)		(13,866)	(61,068)		(34,769)
Other adjustments	467		92	1,396		(1,120)
Other Real Estate Owned Ending Balance	155,242		163,637	155,242		163,637
Non-covered loans | Commercial / Construction
Other Real Estate Owned Rollforward [Line Items]
Other Real Estate Owned Beginning Balance	23,949		24,110	20,401		32,471
Other Real Estate Owned Write Downs	(2,702)	[1]	(255)	(4,681)	[2]	(2,533)
Additions	982		2,388	8,604		5,500
Other Real Estate Owned Sales	(743)		(5,052)	(2,707)		(13,632)
Other adjustments	0		0	(131)		(615)
Other Real Estate Owned Ending Balance	21,486		21,191	21,486		21,191
Covered loans | Mortgages
Other Real Estate Owned Rollforward [Line Items]
Other Real Estate Owned Beginning Balance	25,350		37,984	32,128		36,685
Other Real Estate Owned Write Downs	(234)		(667)	(2,980)		(1,533)
Additions	1,560		4,212	9,775		13,935
Other Real Estate Owned Sales	(4,395)		(3,803)	(15,184)		(10,759)
Other adjustments	(736)		(312)	(2,194)		(914)
Other Real Estate Owned Ending Balance	$ 21,545		$ 37,414	$ 21,545		$ 37,414

[1] Includes $2.7 million related to the damages from Hurricane Maria, of which $1.3 million were for commercial and $1.4 million for residential.

[2] Includes $2.7 million related to the damages from Hurricane Maria, of which $1.3 million were for commercial and $1.4 million for residential.