LOAN PORTFOLIO - Corporation's TDR Activity (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014
Schedule Of Financing Receivables [Line Items]
Beginning Balance of TDRs		$ 661,591	$ 694,453	[1]	$ 630,258
New TDRs		84,942	111,890		164,108
Increases to existing TDRs (disbursements)		3,921	1,018		1,903
Charge-offs post modification	[2]	(24,876)	(64,116)		(43,916)
Financing Receivable Modifications Sold		(3,761)	(44,048)		(4,500)
Foreclosures		(16,834)	(39,706)		(4,948)
Removed from TDR classification		(3,031)	0		0
TDRs transferred to loans held for sale	[3]	0	40,005		0
Paid-off and partial payments		(54,904)	(37,905)		(48,452)
Ending balance of TDRs		$ 647,048	$ 661,591		$ 694,453	[1]

[1] Excludes TDRs held for sale amounting to $45.7 million as of December 31, 2014.

[2] For the year ended December 31, 2016, includes $1.3 million of charge-offs related to TDRs included in the sale of the $16.3 million pool of non-performing assets. For the year ended December 31, 2015 includes $45.3 million of charge-offs related to TDRs included in the bulk sale of assets.

[3] 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 and continues to be classified as a TDR and a non-performing loan.