LOANS (Troubled-Amortized Cost Basis Debt Restructuring Loan Portfolio) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis.	$ 0	$ 289	$ 0	$ 289
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis.	941	1,465	1,357	2,048
Combination of Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis.	1,406	576	1,661	576
Combination of Term Extension and Principal or Interest Forgiveness/Forbearance
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis.	2,267	122	2,267	3,432
Combination of Interest Rate Reduction, Term Extension and Principal Forgiveness / Forbearance
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis.	0	4,146	0	7,460
Commercial loans \| Commercial secured by real estate: \| Domestic - Puerto Rico \| Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis.	$ 0	$ 206	$ 0	$ 206
Percentage of total class of financing receivable.	0.00%	0.02%	0.00%	0.02%
Commercial loans \| Commercial secured by real estate: \| Domestic - Puerto Rico \| Combination of Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis.	$ 1,203	$ 467	$ 1,203	$ 467
Percentage of total class of financing receivable.	0.09%	0.03%	0.09%	0.03%
Commercial loans \| Other commercial and industrial \| Domestic - Puerto Rico \| Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis.	$ 0	$ 83	$ 0	$ 83
Percentage of total class of financing receivable.	0.00%	0.01%	0.00%	0.01%
Commercial loans \| Other commercial and industrial \| Domestic - Puerto Rico \| Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis.	$ 0	$ 716	$ 0	$ 716
Percentage of total class of financing receivable.	0.00%	0.06%	0.00%	0.06%
Commercial loans \| Other commercial and industrial \| Domestic - Puerto Rico \| Combination of Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis.	$ 0	$ 0	$ 89	$ 0
Percentage of total class of financing receivable.	0.00%	0.00%	0.01%	0.00%
Commercial loans \| Commercial US \| Principal Forbearance / Forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis.				$ 10,170
Percentage of total class of financing receivable.				1.23%
Commercial loans \| Commercial US \| Combination of Interest Rate Reduction, Term Extension and Principal Forgiveness / Forbearance
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis.	$ 0	$ 4,009	$ 0	$ 7,323
Percentage of total class of financing receivable.	0.00%	0.49%	0.00%	0.89%
Commercial loans \| Commercial US \| US – Federal \| Principal Forbearance / Forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis.	$ 3,331	$ 10,170	$ 3,331
Percentage of total class of financing receivable.	0.38%	1.23%	0.38%
Commercial loans \| Commercial US \| US – Federal \| Combination of Term Extension and Principal or Interest Forgiveness/Forbearance
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis.	$ 2,194	$ 0	$ 2,194	$ 3,310
Percentage of total class of financing receivable.	0.25%	0.00%	0.25%	0.40%
Mortgage loans \| Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis.	$ 878	$ 648	$ 1,231	$ 1,231
Percentage of total class of financing receivable.	0.06%	0.05%	0.09%	0.09%
Mortgage loans \| Combination of Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis.	$ 0	$ 55	$ 0	$ 55
Percentage of total class of financing receivable.	0.00%	0.00%	0.00%	0.00%
Mortgage loans \| Combination of Term Extension and Principal or Interest Forgiveness/Forbearance
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis.	$ 73	$ 122	$ 73	$ 122
Percentage of total class of financing receivable.	0.01%	0.01%	0.01%	0.01%
Mortgage loans \| Combination of Interest Rate Reduction, Term Extension and Principal Forgiveness / Forbearance
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis.	$ 0	$ 137	$ 0	$ 137
Percentage of total class of financing receivable.	0.00%	0.01%	0.00%	0.01%
Consumer \| Personal loans \| Combination of Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis.	$ 39	$ 0	$ 62	$ 0
Percentage of total class of financing receivable.	0.01%	0.00%	0.01%	0.00%
Auto loans \| Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis.	$ 63	$ 101	$ 126	$ 101
Percentage of total class of financing receivable.	0.00%	0.00%	0.00%	0.00%
Auto loans \| Combination of Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis.	$ 164	$ 54	$ 307	$ 54
Percentage of total class of financing receivable.	0.01%	0.00%	0.01%	0.00%

Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
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-Section 55
-Paragraph 12A
-Publisher FASB
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

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