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LOANS HELD FOR INVESTMENT - Additional Information V (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 13,048,684		$ 13,048,684		$ 13,048,684		$ 12,746,556
Loans modified to borrowers experiencing financial difficulty	3,483	$ 6,769	39,475	$ 126,897	59,020	$ 129,103
Financing receivable that had a payment default			300	100
United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,499,469		2,499,469		2,499,469		2,294,950
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	259,863		259,863		259,863		228,396
Loans modified to borrowers experiencing financial difficulty	0	122	0	122	0	122
Commercial Portfolio Segment [Member] | Construction Loans [Member] | United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	24,550		24,550		24,550		43,969
Commercial Portfolio Segment [Member] | Government [Member] | Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	213,700		213,700		213,700		193,300
Commercial Portfolio Segment [Member] | Government [Member] | V I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	125,800		125,800		125,800		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	31,000		31,000		31,000
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	155,400		155,400		155,400
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	18,600		18,600		18,600
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	8,700		8,700		8,700
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	78,300		78,300		78,300		59,200
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,889,081		2,889,081		2,889,081		2,828,431
Residential Portfolio Segment [Member] | United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	522,063		522,063		522,063		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	88,249		88,249		88,249		92,252
Loans modified to borrowers experiencing financial difficulty	1,600	$ 500	4,600	$ 3,700	5,100	$ 4,300
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	1,094		1,094		1,094		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	$ 68,400		$ 68,400		$ 68,400		$ 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			77.00%
Product Concentration Risk [Member] | Loans and Finance Receivables [Member] | United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit risk concentration			19.00%
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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