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LOANS HELD FOR INVESTMENT - Loan Modifications are Considered TDRs (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	123	169	483	548
Pre-Modification Outstanding Recorded Investment	$ 23,181	$ 3,401	$ 30,496	$ 32,517
Post-Modification Outstanding Recorded Investment	$ 23,078	$ 3,187	$ 30,216	$ 31,733
Residential Portfolio Segment [Member] | Conventional Loan [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	23	20	48	72
Pre-Modification Outstanding Recorded Investment	$ 2,654	$ 2,070	$ 5,552	$ 6,427
Post-Modification Outstanding Recorded Investment	$ 2,650	$ 1,938	$ 5,447	$ 5,722
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	3	0	5	6
Pre-Modification Outstanding Recorded Investment	$ 9,100	$ 0	$ 9,694	$ 22,064
Post-Modification Outstanding Recorded Investment	$ 9,100	$ 0	$ 9,571	$ 22,064
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	2	0	6	2
Pre-Modification Outstanding Recorded Investment	$ 10,433	$ 0	$ 11,091	$ 75
Post-Modification Outstanding Recorded Investment	$ 10,331	$ 0	$ 11,028	$ 81
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	22	37	101	133
Pre-Modification Outstanding Recorded Investment	$ 435	$ 658	$ 1,875	$ 2,102
Post-Modification Outstanding Recorded Investment	$ 436	$ 655	$ 1,877	$ 2,091
Consumer Portfolio Segment [Member] | Finance Leases [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	10	4	33	29
Pre-Modification Outstanding Recorded Investment	$ 190	$ 54	$ 550	$ 408
Post-Modification Outstanding Recorded Investment	$ 191	$ 54	$ 552	$ 408
Consumer Portfolio Segment [Member] | Personal Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	9	7	32	23
Pre-Modification Outstanding Recorded Investment	$ 103	$ 60	$ 330	$ 202
Post-Modification Outstanding Recorded Investment	$ 103	$ 60	$ 336	$ 200
Consumer Portfolio Segment [Member] | Other Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	14	55	55	140
Pre-Modification Outstanding Recorded Investment	$ 59	$ 335	$ 233	$ 530
Post-Modification Outstanding Recorded Investment	$ 60	$ 256	$ 234	$ 458
Consumer Portfolio Segment [Member] | Credit cards [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	40	46	203	143
Pre-Modification Outstanding Recorded Investment	$ 207	$ 224	$ 1,171	$ 709
Post-Modification Outstanding Recorded Investment	$ 207	$ 224	$ 1,171	$ 709
Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	121	168	477	547
Pre-Modification Outstanding Recorded Investment	$ 22,611	$ 3,378	$ 28,731	$ 32,494
Post-Modification Outstanding Recorded Investment	$ 22,508	$ 3,164	$ 28,451	$ 31,710
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	21	20	43	72
Pre-Modification Outstanding Recorded Investment	$ 2,084	$ 2,070	$ 4,086	$ 6,427
Post-Modification Outstanding Recorded Investment	$ 2,080	$ 1,938	$ 3,981	$ 5,722
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
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 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	3	0	4	6
Pre-Modification Outstanding Recorded Investment	$ 9,100	$ 0	$ 9,395	$ 22,064
Post-Modification Outstanding Recorded Investment	$ 9,100	$ 0	$ 9,272	$ 22,064
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	2	0	6	2
Pre-Modification Outstanding Recorded Investment	$ 10,433	$ 0	$ 11,091	$ 75
Post-Modification Outstanding Recorded Investment	$ 10,331	$ 0	$ 11,028	$ 81
Puerto Rico and Virgin Islands regions [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	22	37	101	133
Pre-Modification Outstanding Recorded Investment	$ 435	$ 658	$ 1,875	$ 2,102
Post-Modification Outstanding Recorded Investment	$ 436	$ 655	$ 1,877	$ 2,091
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	10	4	33	29
Pre-Modification Outstanding Recorded Investment	$ 190	$ 54	$ 550	$ 408
Post-Modification Outstanding Recorded Investment	$ 191	$ 54	$ 552	$ 408
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	9	7	32	23
Pre-Modification Outstanding Recorded Investment	$ 103	$ 60	$ 330	$ 202
Post-Modification Outstanding Recorded Investment	$ 103	$ 60	$ 336	$ 200
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	14	54	55	139
Pre-Modification Outstanding Recorded Investment	$ 59	$ 312	$ 233	$ 507
Post-Modification Outstanding Recorded Investment	$ 60	$ 233	$ 234	$ 435
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	40	46	203	143
Pre-Modification Outstanding Recorded Investment	$ 207	$ 224	$ 1,171	$ 709
Post-Modification Outstanding Recorded Investment	$ 207	$ 224	$ 1,171	$ 709
Florida region
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	2	1	6	1
Pre-Modification Outstanding Recorded Investment	$ 570	$ 23	$ 1,765	$ 23
Post-Modification Outstanding Recorded Investment	$ 570	$ 23	$ 1,765	$ 23
Florida region | Residential Portfolio Segment [Member] | Conventional Loan [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	2	0	5	0
Pre-Modification Outstanding Recorded Investment	$ 570	$ 0	$ 1,466	$ 0
Post-Modification Outstanding Recorded Investment	$ 570	$ 0	$ 1,466	$ 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
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding 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	1	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 299	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 299	$ 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
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Florida region | Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding 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
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding 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
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding 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	1	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 23	$ 0	$ 23
Post-Modification Outstanding Recorded Investment	$ 0	$ 23	$ 0	$ 23
Florida region | Consumer Portfolio Segment [Member] | Credit cards [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | numberofcontracts	0	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0

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