LOAN PORTFOLIO- Selected Information on TDRs includes Recorded Investment by Loan Class and Modification Type (Detail) - USD ($) $ in Thousands	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 647,048		$ 661,591		$ 694,453	[1]	$ 630,258
Non-FHA/VA Residential Mortgage loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	375,809		382,672		349,775
Commercial Mortgage Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	48,742		44,498		127,766
Commercial And Industrial Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	133,521		150,254		171,926
Construction Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	46,600
Auto loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	24,875		21,582		16,991
Finance Leases [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,647		2,077		2,181
Other Consumer Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	14,842		14,794		13,307
Land Construction [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	9,362		2,766		2,470
Residential Construction [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	357		3,482		10,037
Commercial Construction [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	36,893		39,466	[2]
Troubled Debt Restructurings Interest Rate Below Market [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	37,645		35,697		68,455	[1]
Troubled Debt Restructurings Interest Rate Below Market [Member] | Non-FHA/VA Residential Mortgage loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	29,254		29,066		24,850
Troubled Debt Restructurings Interest Rate Below Market [Member] | Commercial Mortgage Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	6,044		4,379		29,881
Troubled Debt Restructurings Interest Rate Below Market [Member] | Commercial And Industrial Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,111		2,163		7,533
Troubled Debt Restructurings Interest Rate Below Market [Member] | Auto loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0		0
Troubled Debt Restructurings Interest Rate Below Market [Member] | Finance Leases [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0		0
Troubled Debt Restructurings Interest Rate Below Market [Member] | Other Consumer Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	236		89		37
Troubled Debt Restructurings Interest Rate Below Market [Member] | Land Construction [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0		0
Troubled Debt Restructurings Interest Rate Below Market [Member] | Residential Construction [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0		6,154
Troubled Debt Restructurings Interest Rate Below Market [Member] | Commercial Construction [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0	[2]
Troubled Debt Restructurings Maturity Or Term Extension [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	88,535		87,159		100,662	[1]
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Non-FHA/VA Residential Mortgage loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	8,373		6,027		5,859
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Commercial Mortgage Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,007		1,244		12,737
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Commercial And Industrial Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	66,830		75,104		80,642
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Auto loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,706		2,330		380
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Finance Leases [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	366		621		376
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Other Consumer Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,518		1,604		129
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Land Construction [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	6,735		229		202
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Residential Construction [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0		337
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Commercial Construction [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0	[2]
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	355,812		380,714		415,187	[1]
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Non-FHA/VA Residential Mortgage loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	280,588		297,310		283,317
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Commercial Mortgage Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	30,005		26,109		72,493
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Commercial And Industrial Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	16,359		27,214		31,553
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Auto loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	14,698		12,388		10,363
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Finance Leases [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,281		1,456		1,805
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Other Consumer Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	9,662		11,026		10,812
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Land Construction [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,219		2,165		1,732
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Residential Construction [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		3,046		3,112
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Commercial Construction [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0	[2]
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	38,055		42,820		3,517	[1]
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Non-FHA/VA Residential Mortgage loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0		0
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Commercial Mortgage Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0		0
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Commercial And Industrial Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	863		3,027		3,074
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Auto loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0		0
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Finance Leases [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0		0
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Other Consumer Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	299		327		443
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Land Construction [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0		0
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Residential Construction [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0		0
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Commercial Construction [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	36,893		39,466	[2]
Troubled Debt Restructurings Other [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	127,001	[3]	115,201	[4]	106,632	[1],[5]
Troubled Debt Restructurings Other [Member] | Non-FHA/VA Residential Mortgage loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	57,594	[3]	50,269	[4]	35,749	[5]
Troubled Debt Restructurings Other [Member] | Commercial Mortgage Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	10,686	[3]	12,766	[4]	12,655	[5]
Troubled Debt Restructurings Other [Member] | Commercial And Industrial Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	47,358	[3]	42,746	[4]	49,124	[5]
Troubled Debt Restructurings Other [Member] | Auto loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	8,471	[3]	6,864	[4]	6,248	[5]
Troubled Debt Restructurings Other [Member] | Finance Leases [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	0	[3]	0	[4]	0	[5]
Troubled Debt Restructurings Other [Member] | Other Consumer Loans [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,127	[3]	1,748	[4]	1,886	[5]
Troubled Debt Restructurings Other [Member] | Land Construction [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	408	[3]	372	[4]	536	[5]
Troubled Debt Restructurings Other [Member] | Residential Construction [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	357	[3]	436	[4]	$ 434	[5]
Troubled Debt Restructurings Other [Member] | Commercial Construction [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 0	[3]	$ 0	[2],[4]

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

[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 non-performing loan.

[3] Other concessions granted by the Corporation include deferral of principal and/or interest payments for a period longer than what would be considered insignificant, payment plans under judicial stipulation, or a combination of the concessions listed in the table.

[4] Other concessions granted by the Corporation include deferral of principal and/or interest payments for a period longer than what would be considered insignificant, payment plans under judicial stipulation, or a combination of the concessions listed in the table above.

[5] Other concessions granted by the Corporation include deferral of principal and/or interest payments for a period longer than what would be considered insignificant, payment plans under judicial stipulation, or a combination of the concessions listed in the table above.