LOANS (Investment in Loans on Non-Accrual Status) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	$ 56,426	$ 63,399
Non-accrual with no Allowance for Credit Loss	15,693	16,000
Total	72,119	79,399
Non-PCD
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	53,344	60,089
Non-accrual with no Allowance for Credit Loss	12,559	12,636
Total	65,903	72,725
PCD
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	3,082	3,310
Non-accrual with no Allowance for Credit Loss	3,134	3,364
Total	6,216	6,674
Commercial loans \| Non-PCD
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	25,338	27,337
Non-accrual with no Allowance for Credit Loss	8,456	8,759
Total	33,794	36,096
Commercial loans \| Non-PCD \| Puerto Rico
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	6,759	8,113
Non-accrual with no Allowance for Credit Loss	8,456	8,759
Total	15,215	16,872
Commercial loans \| Non-PCD \| UNITED STATES
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	18,579	19,224
Non-accrual with no Allowance for Credit Loss	0	0
Total	18,579	19,224
Commercial loans \| PCD \| Puerto Rico
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	2,835	3,060
Non-accrual with no Allowance for Credit Loss	3,134	3,364
Total	5,969	6,424
Mortgage loans \| Non-PCD
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	9,746	10,339
Non-accrual with no Allowance for Credit Loss	3,954	3,858
Total	13,700	14,197
Mortgage loans \| PCD
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	247	250
Non-accrual with no Allowance for Credit Loss	0	0
Total	247	250
Consumer \| Non-PCD
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	3,750	3,362
Non-accrual with no Allowance for Credit Loss	143	14
Total	3,893	3,376
Auto loans \| Non-PCD
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	14,510	19,051
Non-accrual with no Allowance for Credit Loss	6	5
Total	14,516	19,056
Commercial secured by real estate: \| Commercial loans \| Non-PCD \| Puerto Rico
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	3,818	3,553
Non-accrual with no Allowance for Credit Loss	7,747	7,929
Total	11,565	11,482
Commercial secured by real estate: \| Commercial loans \| PCD \| Puerto Rico
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	2,835	3,060
Non-accrual with no Allowance for Credit Loss	2,306	2,417
Total	5,141	5,477
Other commercial and industrial \| Commercial loans \| Non-PCD \| Puerto Rico
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	2,941	4,560
Non-accrual with no Allowance for Credit Loss	709	830
Total	3,650	5,390
Other commercial and industrial \| Commercial loans \| PCD \| Puerto Rico
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	0	0
Non-accrual with no Allowance for Credit Loss	828	947
Total	828	947
Personal loans \| Consumer \| Non-PCD
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	3,203	2,741
Non-accrual with no Allowance for Credit Loss	143	14
Total	3,346	2,755
Credit lines \| Consumer \| Non-PCD
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	21	35
Non-accrual with no Allowance for Credit Loss	0	0
Total	21	35
Credit cards \| Consumer \| Non-PCD
Financing Receivable, Nonaccrual [Line Items]
Non-accrual with Allowance for Credit Loss	526	586
Non-accrual with no Allowance for Credit Loss	0	0
Total	$ 526	$ 586

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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