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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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