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LOANS (Composition of Loan Portfolio) (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 8,297,454		$ 8,201,042
Allowance for credit losses	(188,255)		(202,341)	$ (189,944)
Total loans held-for-investment, net	8,109,199		7,998,701
Total loans held-for-sale	7,822		15,545
Total loans	8,117,021		8,014,246
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	3,619,221		3,490,169
Allowance for credit losses	(53,061)			(55,068)
Total loans held-for-sale	0		3,062
Commercial loans \| Domestic - Puerto Rico
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,747,767		2,660,194
Commercial loans \| US – Federal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	871,454		829,975
Mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,367,206		1,390,346
Allowance for credit losses	(9,457)			(9,367)
Total loans held-for-sale	7,822		12,483
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	687,199		683,548
Allowance for credit losses	(33,767)			(32,832)
Auto loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,623,828		2,636,979
Allowance for credit losses	(91,970)			(92,677)
Non-PCD
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	7,519,307		7,375,471
Allowance for credit losses	(184,747)	$ (200,111)	(198,239)	(182,765)	$ (174,752)	$ (170,709)
Total loans held-for-investment, net	7,334,560		7,177,232
Total loans held-for-sale	7,822		15,545
Total loans	7,342,382		7,192,777
Non-PCD \| Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	3,550,734		3,416,280
Allowance for credit losses	(52,707)	(68,408)	(65,943)	(51,586)	(45,452)	(44,814)
Total loans held-for-sale	0		3,062
Non-PCD \| Commercial loans \| Domestic - Puerto Rico
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,679,280		2,586,305
Non-PCD \| Commercial loans \| US – Federal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	871,454		829,975
Non-PCD \| Mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	657,928		639,055
Allowance for credit losses	(6,314)	(6,243)	(6,358)	(5,684)	(5,922)	(6,395)
Total loans held-for-sale	7,822		12,483
Non-PCD \| Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	686,883		683,246
Allowance for credit losses	(33,757)	(32,998)	(33,466)	(32,822)	(32,236)	(31,818)
Non-PCD \| Auto loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,623,762		2,636,890
Allowance for credit losses	(91,969)	(92,462)	(92,472)	(92,673)	(91,142)	(87,682)
PCD
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	778,147		825,571
Allowance for credit losses	(3,508)	(3,845)	(4,102)	(7,179)	(6,422)	(5,154)
Total loans held-for-investment, net	774,639		821,469
Total loans held-for-sale	0		0
Total loans	774,639		821,469
PCD \| Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	68,487		73,889
Allowance for credit losses	(354)	(495)	(493)	(3,482)	(2,338)	(622)
Total loans held-for-sale	0		0
PCD \| Commercial loans \| Domestic - Puerto Rico
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	68,487		73,889
PCD \| Commercial loans \| US – Federal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0		0
PCD \| Mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	709,278		751,291
Allowance for credit losses	(3,143)	(3,338)	(3,599)	(3,683)	(4,068)	(4,514)
Total loans held-for-sale	0		0
PCD \| Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	316		302
Allowance for credit losses	(10)	(10)	(9)	(10)	(11)	(11)
PCD \| Auto loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	66		89
Allowance for credit losses	(1)	$ (2)	(1)	$ (4)	$ (5)	$ (7)
Commercial secured by real estate \| Commercial loans \| Domestic - Puerto Rico
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,327,149		1,306,300
Commercial secured by real estate \| Non-PCD \| Commercial loans \| Domestic - Puerto Rico
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,267,795		1,241,646
Commercial secured by real estate \| PCD \| Commercial loans \| Domestic - Puerto Rico
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	59,354		64,654
Other commercial and industrial \| Commercial loans \| Domestic - Puerto Rico
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,420,618		1,353,894
Other commercial and industrial \| Non-PCD \| Commercial loans \| Domestic - Puerto Rico
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,411,485		1,344,659
Other commercial and industrial \| PCD \| Commercial loans \| Domestic - Puerto Rico
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	9,133		9,235
Personal loans \| Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	644,990		638,985
Personal loans \| Non-PCD \| Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	644,990		638,985
Personal loans \| PCD \| Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0		0
Credit lines \| Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	9,176		9,629
Credit lines \| Non-PCD \| Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	8,860		9,327
Credit lines \| PCD \| Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	316		302
Credit cards \| Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	32,270		34,300
Credit cards \| Non-PCD \| Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	32,270		34,300
Credit cards \| PCD \| Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0		0
Overdraft \| Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	763		634
Overdraft \| Non-PCD \| Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	763		634
Overdraft \| PCD \| Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 0		$ 0