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LOAN PORTFOLIO - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Feb. 27, 2015	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]
Branches Doral	10
Financing Receivable Recorded Investment Past Due		$ 529,279		$ 574,654
Gain on sale of loans		1,536	$ 1,096
Loans and Leases Receivable, Gross		8,996,816	8,695,890	8,858,123
TDR [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable Modifications Recorded Investment		589,795	572,376	582,647	$ 587,219
Outstanding unfunded commitments on TDR loans		$ 300
Puerto Rico [Member]
Loans and Leases Receivable Disclosure [Line Items]
Credit risk concentration		74.00%
Outstanding of credit facilities granted		$ 60,600		61,600
Puerto Rico [Member] \| PREPA [Member]
Loans and Leases Receivable Disclosure [Line Items]
Outstanding of credit facilities granted		14,300
Puerto Rico [Member] \| Municipalities [Member]
Loans and Leases Receivable Disclosure [Line Items]
Outstanding of credit facilities granted		$ 46,300
USVI and BVI [Member]
Loans and Leases Receivable Disclosure [Line Items]
Credit risk concentration		5.00%
United States [Member]
Loans and Leases Receivable Disclosure [Line Items]
Credit risk concentration		21.00%
USVI [Member]
Loans and Leases Receivable Disclosure [Line Items]
Outstanding of credit facilities granted		$ 61,600		55,800
USVI [Member] \| Public Corporations Member [Member]
Loans and Leases Receivable Disclosure [Line Items]
Outstanding of credit facilities granted		38,400
USVI [Member] \| Independent instrumentality of the USVI government [Member]
Loans and Leases Receivable Disclosure [Line Items]
Outstanding of credit facilities granted		23,200
Performing Financing Receivable [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross		8,119,502	7,794,329	7,951,214
Performing Financing Receivable [Member] \| Ab Note Restructure Workout Strategy [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable Modifications Recorded Investment		41,600
PCI loans
Loans and Leases Receivable Disclosure [Line Items]
Outstanding principal balance of PCI loans		178,200		181,100
Financing Receivable Recorded Investment Past Due		35,650		36,423
Loans and Leases Receivable, Gross		144,443	155,281	146,640	$ 158,174
Residential Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Purchase of loans		4,300
Loans and Leases Receivable, Gross		3,126,562	3,267,868	3,163,208
Residential Portfolio Segment [Member] \| TDR [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans in trial		1,400
Residential Portfolio Segment [Member] \| PRHFA [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross		111,500		112,100
Residential Portfolio Segment [Member] \| Performing Financing Receivable [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross		2,591,848	2,699,191	2,616,300
Residential Portfolio Segment [Member] \| PCI loans
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable Recorded Investment Past Due		33,133		33,911
Loans and Leases Receivable, Gross		140,979	151,067	143,176
Residential Portfolio Segment [Member] \| Loans Insured or Guaranteed by US Government Authorities [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans sales		51,000
Financing Receivable Recorded Investment Past Due		104,427		108,934
Loans and Leases Receivable, Gross		141,655		147,205
Residential Portfolio Segment [Member] \| Loans Insured or Guaranteed by US Government Authorities [Member] \| TDR [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable Modifications Recorded Investment		61,000		60,500
Residential Portfolio Segment [Member] \| Loans Insured or Guaranteed by US Government Authorities [Member] \| Performing Financing Receivable [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross		141,655		147,205
Residential Portfolio Segment [Member] \| Loans Insured or Guaranteed by US Government Authorities [Member] \| Nonaccrual [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross		0		0
Residential Portfolio Segment [Member] \| Loans Insured or Guaranteed by US Government Authorities [Member] \| PCI loans
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross		0		0
Residential Portfolio Segment [Member] \| FNMA and FHLC loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Purchase of loans		63	3
Loans sales		26,300
Residential Portfolio Segment [Member] \| GNMA [Member] \| Repurchase Option Program [Member]
Loans and Leases Receivable Disclosure [Line Items]
Purchase of loans		4,200	1,100
Financing Receivable Recorded Investment Past Due		44,600		43,600
Residential Portfolio Segment [Member] \| Residential mortgage loans collateralized by residential real estate property
Loans and Leases Receivable Disclosure [Line Items]
Mortage laons in process of foreclosure		162,500
Residential Portfolio Segment [Member] \| Residential mortgage loans collateralized by residential real estate property \| PCI loans
Loans and Leases Receivable Disclosure [Line Items]
Mortage laons in process of foreclosure		19,000
Residential Portfolio Segment [Member] \| Residential mortgage loans collateralized by residential real estate property \| Loans Insured or Guaranteed by US Government Authorities [Member]
Loans and Leases Receivable Disclosure [Line Items]
Mortage laons in process of foreclosure		44,400
Commercial Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross		3,854,962		3,750,202
Commercial Portfolio Segment [Member] \| Commercial And Industrial Sector [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable Recorded Investment Past Due		29,108		38,001
Loans and Leases Receivable, Gross		2,211,731	2,061,773	2,148,111
Commercial Portfolio Segment [Member] \| Substandard [Member] \| Commercial And Industrial Sector [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross		42,887		45,274
Commercial Portfolio Segment [Member] \| TDR [Member] \| Commercial And Industrial Sector [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable Modifications Recorded Investment		72,348		74,921
Commercial Portfolio Segment [Member] \| Construction Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross		84,507	79,150	79,429
Commercial Portfolio Segment [Member] \| Construction Loans [Member] \| TDR [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable Modifications Recorded Investment		5,100
Commercial Portfolio Segment [Member] \| Puerto Rico [Member] \| Substandard [Member] \| Commercial And Industrial Sector [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans sales			5,600
Charge-off of loan sold			1,300
Commercial Portfolio Segment [Member] \| United States [Member] \| Commercial And Industrial Sector [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans sales			9,200
Commercial Portfolio Segment [Member] \| Performing Financing Receivable [Member] \| Commercial And Industrial Sector [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross		2,129,384	1,941,995	2,056,919
Commercial Portfolio Segment [Member] \| Performing Financing Receivable [Member] \| Construction Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross		78,327	67,083	72,836
Commercial Portfolio Segment [Member] \| Nonaccrual [Member] \| Loans Held For Sale [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans sales		4,800
Gain on sale of loans		200
Commercial Portfolio Segment [Member] \| PCI loans \| Commercial And Industrial Sector [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross		0	0	0
Commercial Portfolio Segment [Member] \| PCI loans \| Construction Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross		0	0	0
Consumer Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross		2,015,292	1,734,596	1,944,713
Consumer Portfolio Segment [Member] \| TDR [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable Modifications Recorded Investment		28,300
Consumer Portfolio Segment [Member] \| Performing Financing Receivable [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross		1,986,864	1,699,897	1,913,387
Consumer Portfolio Segment [Member] \| PCI loans
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross		$ 0	$ 0	$ 0