LOANS (Troubled-Amortized Cost Basis Debt Restructuring Loan Portfolio) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 32	$ 0	$ 58	$ 0
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	595	7,315	694	10,275
Principal Forbearance / Forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	0	0	$ 0	100
% of Total Class of Financing Receivable			0.00%
Combination of Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	92	475	$ 92	686
Combination of Term Extension and Principal Forgiveness / Forbearance
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	0	4,691	$ 0	4,691
% of Total Class of Financing Receivable			0.00%
Commercial loans | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0		$ 0
% of Total Class of Financing Receivable		0.00%		0.00%
Commercial loans | Interest Rate Reduction | Puerto Rico
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0		$ 0
% of Total Class of Financing Receivable		0.00%		0.00%
Commercial loans | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 5,488		$ 5,957
% of Total Class of Financing Receivable		0.20%		0.21%
Commercial loans | Term Extension | Puerto Rico
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 5,488		$ 5,957
% of Total Class of Financing Receivable		0.20%		0.21%
Commercial loans | Principal Forbearance / Forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0		$ 0
% of Total Class of Financing Receivable		0.00%		0.00%
Commercial loans | Principal Forbearance / Forgiveness | Puerto Rico
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0		$ 0
% of Total Class of Financing Receivable		0.00%		0.00%
Commercial loans | Combination of Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0		$ 0
% of Total Class of Financing Receivable		0.00%		0.00%
Commercial loans | Combination of Term Extension and Interest Rate Reduction | Puerto Rico
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0		$ 0
% of Total Class of Financing Receivable		0.00%		0.00%
Commercial loans | Combination of Term Extension and Principal Forgiveness / Forbearance
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 4,260		$ 4,260
% of Total Class of Financing Receivable		0.64%		0.64%
Commercial loans | Combination of Term Extension and Principal Forgiveness / Forbearance | Puerto Rico
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0		$ 0
% of Total Class of Financing Receivable		0.00%		0.00%
Commercial loans | Commercial secured by real estate: | Interest Rate Reduction | Puerto Rico
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0		$ 0
% of Total Class of Financing Receivable		0.00%		0.00%
Commercial loans | Commercial secured by real estate: | Term Extension | Puerto Rico
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 5,341		$ 5,810
% of Total Class of Financing Receivable		0.48%		0.52%
Commercial loans | Commercial secured by real estate: | Principal Forbearance / Forgiveness | Puerto Rico
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0		$ 0
% of Total Class of Financing Receivable		0.00%		0.00%
Commercial loans | Commercial secured by real estate: | Combination of Term Extension and Interest Rate Reduction | Puerto Rico
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0		$ 0
% of Total Class of Financing Receivable		0.00%		0.00%
Commercial loans | Commercial secured by real estate: | Combination of Term Extension and Principal Forgiveness / Forbearance | Puerto Rico
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0		$ 0
% of Total Class of Financing Receivable		0.00%		0.00%
Commercial loans | Other commercial and industrial | Interest Rate Reduction | Puerto Rico
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0		$ 0
% of Total Class of Financing Receivable		0.00%		0.00%
Commercial loans | Other commercial and industrial | Term Extension | Puerto Rico
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 147		$ 147
% of Total Class of Financing Receivable		0.01%		0.01%
Commercial loans | Other commercial and industrial | Principal Forbearance / Forgiveness | Puerto Rico
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0		$ 0
% of Total Class of Financing Receivable		0.00%		0.00%
Commercial loans | Other commercial and industrial | Combination of Term Extension and Interest Rate Reduction | Puerto Rico
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0		$ 0
% of Total Class of Financing Receivable		0.00%		0.00%
Commercial loans | Other commercial and industrial | Combination of Term Extension and Principal Forgiveness / Forbearance | Puerto Rico
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0		$ 0
% of Total Class of Financing Receivable		0.00%		0.00%
Commercial loans | Commercial US | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0		$ 0
% of Total Class of Financing Receivable		0.00%		0.00%
Commercial loans | Commercial US | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0		$ 0
% of Total Class of Financing Receivable		0.00%		0.00%
Commercial loans | Commercial US | Principal Forbearance / Forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0		$ 0
% of Total Class of Financing Receivable		0.00%		0.00%
Commercial loans | Commercial US | Combination of Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0		$ 0
% of Total Class of Financing Receivable		0.00%		0.00%
Commercial loans | Commercial US | Combination of Term Extension and Principal Forgiveness / Forbearance
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 4,260		$ 4,260
% of Total Class of Financing Receivable		0.64%		0.64%
Mortgage loans | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 0	$ 0	$ 0	$ 0
% of Total Class of Financing Receivable	0.00%	0.00%	0.00%	0.00%
Mortgage loans | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 595	$ 1,827	$ 687	$ 4,318
% of Total Class of Financing Receivable	0.04%	0.11%	0.05%	0.27%
Mortgage loans | Principal Forbearance / Forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 0	$ 0	$ 0	$ 100
% of Total Class of Financing Receivable	0.00%	0.00%	0.00%	0.01%
Mortgage loans | Combination of Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 92	$ 417	$ 92	$ 602
% of Total Class of Financing Receivable	0.01%	0.03%	0.01%	0.02%
Mortgage loans | Combination of Term Extension and Principal Forgiveness / Forbearance
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 0	$ 431	$ 0	$ 431
% of Total Class of Financing Receivable	0.00%	0.03%	0.00%	0.03%
Consumer | Personal loans | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0	$ 26	$ 0
% of Total Class of Financing Receivable		0.00%	0.00%	0.00%
Consumer | Personal loans | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0	$ 7	$ 0
% of Total Class of Financing Receivable		0.00%	0.00%	0.00%
Consumer | Personal loans | Principal Forbearance / Forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0	$ 0	$ 0
% of Total Class of Financing Receivable		0.00%	0.00%	0.00%
Consumer | Personal loans | Combination of Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 58	$ 0	$ 84
% of Total Class of Financing Receivable		0.01%	0.00%	0.02%
Consumer | Personal loans | Combination of Term Extension and Principal Forgiveness / Forbearance
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0	$ 0	$ 0
% of Total Class of Financing Receivable		0.00%	0.00%	0.00%
Auto loans | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 32		$ 32
% of Total Class of Financing Receivable	0.00%		0.00%
Auto loans | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 0		$ 0
% of Total Class of Financing Receivable	0.00%		0.00%
Auto loans | Principal Forbearance / Forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 0
% of Total Class of Financing Receivable	0.00%
Auto loans | Combination of Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 0		$ 0
% of Total Class of Financing Receivable	0.00%		0.00%
Auto loans | Combination of Term Extension and Principal Forgiveness / Forbearance
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 0
% of Total Class of Financing Receivable	0.00%