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LOANS HELD FOR INVESTMENT - Additional Information V (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 12,675,398		$ 12,675,398		$ 12,746,556
Loans modified to borrowers experiencing financial difficulty	3,017	$ 2,559	146,136	$ 40,135
United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,340,198		2,340,198		2,294,950
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	234,441		234,441		228,396
Loans modified to borrowers experiencing financial difficulty	0	0	119	$ 0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	40,650		40,650		43,969
Commercial Portfolio Segment [Member] | Government [Member] | Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	192,700		192,700		193,300
Commercial Portfolio Segment [Member] | Government [Member] | V I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	116,000		116,000		100,400
Commercial Portfolio Segment [Member] | Government [Member] | Public Corporation [Member] | Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	29,500		29,500
Commercial Portfolio Segment [Member] | Government [Member] | Property Tax Revenue [Member] | Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	132,200		132,200
Commercial Portfolio Segment [Member] | Government [Member] | Municipal Special Obligation Bond [Member] | Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	22,200		22,200
Commercial Portfolio Segment [Member] | Government [Member] | Puerto Rico Electric Power Authority [Member] | Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	8,800		8,800
Commercial Portfolio Segment [Member] | Government [Member] | Low-Income Housing Tax Credit And Community Development Block Grant-Disaster Recovery [Member] | Construction Loans [Member] | Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	62,600		62,600		59,200
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,837,846		2,837,846		2,828,431
Residential Portfolio Segment [Member] | United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	503,193		503,193		505,226
Residential Portfolio Segment [Member] | Loans Insured or Guaranteed by US Government Authorities [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	91,883		91,883		92,252
Loans modified to borrowers experiencing financial difficulty	1,400	$ 1,100
Residential Portfolio Segment [Member] | Loans Insured or Guaranteed by US Government Authorities [Member] | United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,120		1,120		1,128
Residential Portfolio Segment [Member] | Government [Member] | Puerto Rico Housing Finance Authority [Member] | Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 71,500		$ 71,500		$ 72,500
Product Concentration Risk [Member] | Loans and Finance Receivables [Member] | Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit risk concentration	78.00%
Product Concentration Risk [Member] | Loans and Finance Receivables [Member] | United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit risk concentration	18.00%
Product Concentration Risk [Member] | Loans and Finance Receivables [Member] | USVI and BVI [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit risk concentration	4.00%

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