LOANS (Investment in Loans on Non-Accrual Status) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	$ 70,625	$ 61,698
Non-accrual with no Allowance for Credit Loss	11,531	16,280
Total	82,156	77,978
Non-PCD
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	63,595	60,764
Non-accrual with no Allowance for Credit Loss	9,661	14,334
Total	73,256	75,098
Non-PCD \| Commercial loans
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	36,807	27,782
Non-accrual with no Allowance for Credit Loss	7,343	11,131
Total	44,150	38,913
Non-PCD \| Mortgage loans
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	9,263	8,770
Non-accrual with no Allowance for Credit Loss	2,318	3,153
Total	11,581	11,923
Non-PCD \| Consumer
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	3,482	4,163
Non-accrual with no Allowance for Credit Loss	0	44
Total	3,482	4,207
Non-PCD \| Consumer \| Personal loans
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	2,984	3,468
Non-accrual with no Allowance for Credit Loss	0	44
Total	2,984	3,512
Non-PCD \| Consumer \| Credit lines
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	69	125
Non-accrual with no Allowance for Credit Loss	0	0
Total	69	125
Non-PCD \| Consumer \| Credit cards
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	429	570
Non-accrual with no Allowance for Credit Loss	0	0
Total	429	570
Non-PCD \| Auto loans
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	14,043	20,049
Non-accrual with no Allowance for Credit Loss	0	6
Total	14,043	20,055
PCD
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	7,030	934
Non-accrual with no Allowance for Credit Loss	1,870	1,946
Total	8,900	2,880
PCD \| Mortgage loans
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	234	239
Non-accrual with no Allowance for Credit Loss	0	0
Total	234	239
Puerto Rico \| Non-PCD \| Commercial loans
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	5,955	6,465
Non-accrual with no Allowance for Credit Loss	7,343	8,244
Total	13,298	14,709
Puerto Rico \| Non-PCD \| Commercial loans \| Commercial secured by real estate
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	3,744	4,610
Non-accrual with no Allowance for Credit Loss	5,349	6,248
Total	9,093	10,858
Puerto Rico \| Non-PCD \| Commercial loans \| Other commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	2,211	1,855
Non-accrual with no Allowance for Credit Loss	1,994	1,996
Total	4,205	3,851
Puerto Rico \| PCD \| Commercial loans
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	6,796	695
Non-accrual with no Allowance for Credit Loss	1,870	1,946
Total	8,666	2,641
Puerto Rico \| PCD \| Commercial loans \| Commercial secured by real estate
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	6,121	0
Non-accrual with no Allowance for Credit Loss	1,870	1,946
Total	7,991	1,946
Puerto Rico \| PCD \| Commercial loans \| Other commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	675	695
Non-accrual with no Allowance for Credit Loss	0	0
Total	675	695
UNITED STATES \| Non-PCD \| Commercial loans
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	30,852	21,317
Non-accrual with no Allowance for Credit Loss	0	2,887
Total	$ 30,852	$ 24,204

Financing Receivable, Excluding Accrued Interest Receivable, Nonaccrual, With Allowance

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- Definition

Amortized cost excluding accrued interest, of financing receivable on nonaccrual status. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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- Definition

Amortized cost excluding accrued interest, of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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