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SUBSEQUENT EVENTS - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended					9 Months Ended	12 Months Ended
	Feb. 27, 2015	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Jun. 30, 2015	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Subsequent Event [Line Items]
Classified and non-performing loans sold				$ 16,300		$ 147,500
OREO Sold						2,900
Branches Doral	10
Gains Losses On Extinguishment Of Debt		$ 2,300						$ 1,391	$ 4,217	$ 0
Trust Preferred Securties Discount		10.00%			30.00%		19.00%
Trust Preferred Securities Winning Bid		90.00%			70.00%		81.00%
Trust Preferred Securities Repurchases		$ 23,800			$ 10,000		$ 7,300
Sales Price Of Bulk Sale						87,300
Proceeds From Sale Of Non Performing Assets Sold				11,300
PreTax Loss Bulk Sale				1,800		48,700
Reserves Allocated To Bulk Sale				2,800		15,300			$ 2,800
Bulk Sale Charge Offs				4,600		61,400
Classified And Non Performing Loans Sold Outstanding Balance				$ 20,100
Commercial Mortgage Loans [Member]
Subsequent Event [Line Items]
Classified and non-performing loans sold						90,700
Commercial And Industrial Loan [Member]
Subsequent Event [Line Items]
Classified and non-performing loans sold						45,800
Construction Loans [Member]
Subsequent Event [Line Items]
Classified and non-performing loans sold						$ 11,000
Puerto Rico Electric Power Authority [Member]
Subsequent Event [Line Items]
Classified and non-performing loans sold			$ 64,000
Proceeds From Sale Of Non Performing Assets Sold			53,200
PreTax Loss Bulk Sale			600
Reserves Allocated To Bulk Sale			10,200
Classified And Non Performing Loans Sold Outstanding Balance			$ 75,000

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Number of Branches acquired in Doral Bank Acquisition.

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Additional charge-offs associated to loans sold.

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Classified and non-performing loans sold during the period.

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Other real estate property sold during the period.

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Pre tax loss related to the bulk sale of loans.

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Reserves allocated to bulk sale.

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Sale price of bulk sale.

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The par value of trust preferred securities reacquired by the Corporation.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

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