LOANS HELD FOR INVESTMENT - Loan Modifications Considered Troubled Debt Restructurings Defaulted (Detail) - Entity Loan Modification Program [Member]	3 Months Ended
	Mar. 31, 2020 USD ($) numberofcontracts	Mar. 31, 2019 USD ($) numberofcontracts
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	53	38
Recorded Investment | $	$ 2,234,000	$ 298,000
Residential Portfolio Segment [Member] | Conventional Loan [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	6	0
Recorded Investment | $	$ 1,889,000	$ 0
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	1	0
Recorded Investment | $	$ 35,000	$ 0
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0
Recorded Investment | $	$ 0	$ 0
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0
Recorded Investment | $	$ 0	$ 0
Consumer Portfolio Segment [Member] | Other Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	29	18
Recorded Investment | $	$ 108,000	$ 47,000
Consumer Portfolio Segment [Member] | Auto loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	10	20
Recorded Investment | $	$ 176,000	$ 251,000
Consumer Portfolio Segment [Member] | Finance Leases [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	1	0
Recorded Investment | $	$ 5,000	$ 0
Consumer Portfolio Segment [Member] | Personal Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	1	0
Recorded Investment | $	$ 7,000	$ 0
Consumer Portfolio Segment [Member] | Credit cards [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	5	0
Recorded Investment | $	$ 14,000	$ 0
Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	53	38
Recorded Investment | $	$ 2,234,000	$ 298,000
Puerto Rico and Virgin Islands regions [Member] | Residential Portfolio Segment [Member] | Conventional Loan [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	6	0
Recorded Investment | $	$ 1,889,000	$ 0
Puerto Rico and Virgin Islands regions [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	1	0
Recorded Investment | $	$ 35,000	$ 0
Puerto Rico and Virgin Islands regions [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0
Recorded Investment | $	$ 0	$ 0
Puerto Rico and Virgin Islands regions [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0
Recorded Investment | $	$ 0	$ 0
Puerto Rico and Virgin Islands regions [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	29	18
Recorded Investment | $	$ 108,000	$ 47,000
Puerto Rico and Virgin Islands regions [Member] | Consumer Portfolio Segment [Member] | Auto loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	10	20
Recorded Investment | $	$ 176,000	$ 251,000
Puerto Rico and Virgin Islands regions [Member] | Consumer Portfolio Segment [Member] | Finance Leases [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	1	0
Recorded Investment | $	$ 5,000	$ 0
Puerto Rico and Virgin Islands regions [Member] | Consumer Portfolio Segment [Member] | Personal Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	1	0
Recorded Investment | $	$ 7,000	$ 0
Puerto Rico and Virgin Islands regions [Member] | Consumer Portfolio Segment [Member] | Credit cards [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	5	0
Recorded Investment | $	$ 14,000	$ 0
Florida region
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0
Recorded Investment | $	$ 0	$ 0
Florida region | Residential Portfolio Segment [Member] | Conventional Loan [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0
Recorded Investment | $	$ 0	$ 0
Florida region | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0
Recorded Investment | $	$ 0	$ 0
Florida region | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0
Recorded Investment | $	$ 0	$ 0
Florida region | Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0
Recorded Investment | $	$ 0	$ 0
Florida region | Consumer Portfolio Segment [Member] | Other Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0
Recorded Investment | $	$ 0	$ 0
Florida region | Consumer Portfolio Segment [Member] | Auto loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0
Recorded Investment | $	$ 0	$ 0
Florida region | Consumer Portfolio Segment [Member] | Finance Leases [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0
Recorded Investment | $	$ 0	$ 0
Florida region | Consumer Portfolio Segment [Member] | Personal Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0
Recorded Investment | $	$ 0	$ 0
Florida region | Consumer Portfolio Segment [Member] | Credit cards [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0
Recorded Investment | $	$ 0	$ 0