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ALLOWANCE FOR LOAN AND LEASE LOSSES - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2017
Financing Receivable Allowance For Credit Losses [Line Items]
Reserve for unfunded loan commitments	$ 700	$ 700	$ 1,600
Provision For Loan And Lease Losses		144,254	86,733	$ 172,045
Loans and leases receivable gross carrying value	8,850,476	8,850,476	8,886,873
Financing Receivable Allowance For Credit Losses Write Offs		134,770	136,928
Financing Receivable Allowance For Credit Losses	231,843	$ 231,843	205,603	240,710
P R
Financing Receivable Allowance For Credit Losses [Line Items]
Concentration Risk Percentage 1		75.00%
V I
Financing Receivable Allowance For Credit Losses [Line Items]
Concentration Risk Percentage 1		6.00%
U S
Financing Receivable Allowance For Credit Losses [Line Items]
Concentration Risk Percentage 1		19.00%
Puerto Rico And Virgin Islands [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans and leases receivable gross carrying value	7,200	$ 7,200
Concentration Risk Percentage 1		81.00%
Hurricane [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Provision For Loan And Lease Losses	4,800	$ 71,300
Commercial Loans Storm Related Individual Assesment Percentage		80.00%
Financing Receivable Allowance For Credit Losses	68,500	$ 68,500			$ 66,500
Hurricane [Member] | P R
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable Allowance For Credit Losses	62,900	62,900
Hurricane [Member] | V I
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable Allowance For Credit Losses	5,600	5,600
Residential Mortgage [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans and leases receivable gross carrying value	3,290,957	3,290,957	3,296,031
Financing Receivable Allowance For Credit Losses Write Offs		28,186	33,621
Financing Receivable Allowance For Credit Losses	58,975	58,975	33,980	39,570
Residential Mortgage [Member] | Hurricane [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable Allowance For Credit Losses	14,600	14,600
Commercial Mortgage [Member] | Hurricane [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable Allowance For Credit Losses	12,100	12,100
Commercial And Industrial [Member] | Hurricane [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable Allowance For Credit Losses	15,900	15,900
Construction Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans and leases receivable gross carrying value	111,397	111,397	124,951
Financing Receivable Allowance For Credit Losses Write Offs		3,607	1,770
Financing Receivable Allowance For Credit Losses	4,522	4,522	2,562	3,519
Construction Loans [Member] | Hurricane [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable Allowance For Credit Losses Write Offs		2,800
Financing Receivable Allowance For Credit Losses	900	900
Consumer Loan [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans and leases receivable gross carrying value	1,749,897	1,749,897	1,716,628
Financing Receivable Allowance For Credit Losses Write Offs		44,030	54,504
Financing Receivable Allowance For Credit Losses	70,982	70,982	$ 49,847	$ 60,642
Consumer Loan [Member] | Hurricane [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable Allowance For Credit Losses	$ 25,000	$ 25,000
Commercial Portfolio Segment [Member] | Puerto Rico And Virgin Islands [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Concentration Risk Percentage 1		40.00%
Residential And Consumer Loans [Member] | Puerto Rico And Virgin Islands [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Concentration Risk Percentage 1		60.00%

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A valuation allowance for financing receivables that are expected to be uncollectible.

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Amount of direct write-downs of financing receivables charged against the allowance.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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