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LOANS HELD FOR INVESTMENT - Loan Modifications Considered Troubled Debt Restructurings Defaulted (Detail) - Entity Loan Modification Program [Member] $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) numberofcontracts	Sep. 30, 2020 USD ($) numberofcontracts	Sep. 30, 2021 USD ($) numberofcontracts	Sep. 30, 2020 USD ($) numberofcontracts
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	39	50	108	142
Recorded Investment	$ 628	$ 755	$ 1,666	$ 3,253
Residential Portfolio Segment [Member] | Conventional Loan [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	2	2	4	8
Recorded Investment	$ 126	$ 253	$ 304	$ 2,142
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0	0	1
Recorded Investment	$ 0	$ 0	$ 0	$ 35
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Consumer Portfolio Segment [Member] | Other Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	14	9	50
Recorded Investment	$ 0	$ 64	$ 36	$ 191
Consumer Portfolio Segment [Member] | Auto loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	23	19	69	40
Recorded Investment	$ 433	$ 358	$ 1,164	$ 681
Consumer Portfolio Segment [Member] | Finance Leases [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0	0	1
Recorded Investment	$ 0	$ 0	$ 0	$ 5
Consumer Portfolio Segment [Member] | Personal Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	1	0	1	1
Recorded Investment	$ 1	$ 0	$ 1	$ 7
Consumer Portfolio Segment [Member] | Credit cards [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	13	15	25	41
Recorded Investment	$ 68	$ 80	$ 161	$ 192
Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	39	50	108	142
Recorded Investment	$ 628	$ 755	$ 1,666	$ 3,253
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	2	2	4	8
Recorded Investment	$ 126	$ 253	$ 304	$ 2,142
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	0	0	0	1
Recorded Investment	$ 0	$ 0	$ 0	$ 35
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	0	0
Recorded Investment	$ 0	$ 0	$ 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	0	0
Recorded Investment	$ 0	$ 0	$ 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	0	14	9	50
Recorded Investment	$ 0	$ 64	$ 36	$ 191
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	23	19	69	40
Recorded Investment	$ 433	$ 358	$ 1,164	$ 681
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	0	0	0	1
Recorded Investment	$ 0	$ 0	$ 0	$ 5
Puerto Rico and Virgin Islands regions [Member] | Consumer Portfolio Segment [Member] | Personal Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts	1	0	1	1
Recorded Investment	$ 1	$ 0	$ 1	$ 7
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	13	15	25	41
Recorded Investment	$ 68	$ 80	$ 161	$ 192
Florida region
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Florida region | Residential Portfolio Segment [Member] | Conventional Loan [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 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	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Florida region | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Florida region | Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Florida region | Consumer Portfolio Segment [Member] | Other Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Florida region | Consumer Portfolio Segment [Member] | Auto loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Florida region | Consumer Portfolio Segment [Member] | Finance Leases [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Florida region | Consumer Portfolio Segment [Member] | Personal Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Florida region | Consumer Portfolio Segment [Member] | Credit cards [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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