LOAN PORTFOLIO - Activity for Impaired Loans (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Impaired Loans:
Balance at beginning of period		$ 953,774	$ 824,816	$ 806,509	$ 945,407
Loans determined impaired during the period		26,613	37,528	261,544	135,350
Charge-offs	[1]	(30,426)	(7,498)	(50,027)	(90,026)
Loans sold, net charge-offs		0	0	0	(67,836)
Increases to impaired loans (disbursements)		1,091	408	2,852	2,524
Foreclosures		(11,856)	(12,858)	(28,466)	(33,044)
Loans no longer considered impaired		(2,674)	(25,877)	(27,560)	(39,062)
Paid in full or partial payments		(23,668)	(13,811)	(51,998)	(50,605)
Transfer Of Impaired Loans Held For Sale To Portfolio Loans	[2]	0	40,005	0	40,005
Balance at end of period		$ 912,854	$ 842,713	$ 912,854	$ 842,713

[1] For the nine-month period ended September 30, 2015, includes $63.9 million of charge-offs related to a bulk sale of assets completed in the second quarter of 2015, mostly comprised of non-performing and adversely classified commercial loans, as further discussed below.

[2] During the third quarter of 2015, upon the signing of a new agreement with the borrower, the Corporation changed its intent to sell a $40.0 million construction loan in the Virgin Islands. Accordingly, the loan was transferred back from held for sale to held for investment.