LOAN PORTFOLIO - Corporation's TDR Activity (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Schedule Of Financing Receivables [Line Items]
Beginning Balance of TDRs		$ 670,991	$ 634,761	$ 661,591	$ 694,453
New TDRs		15,596	30,044	66,075	95,840
Increases to existing TDRs (disbursements)		517	309	1,573	644
Charge-offs post modification	[1]	(5,445)	(5,327)	(15,899)	(58,707)
Sales		0	0	0	(44,048)
Foreclosures		(5,567)	(6,139)	(12,967)	(16,391)
Removed from TDR classification		0	0	3,031	0
Transfer Of Trouble Debt Restructuring Loans Held For Sale To Portfolio Loans	[2]	0	40,005	0	40,005
Paid-off and partial payments		(19,774)	(11,690)	(41,024)	(29,833)
Ending balance of TDRs		$ 656,318	$ 681,963	$ 656,318	$ 681,963

[1] For the nine-month period ended September 30, 2015, includes $45.3 million of charge offs related to TDRs included in the bulk sale of assets completed in the second quarter of 2015.

[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 and continues to be classified as a TDR and a nonperforming loan.