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LOANS HELD FOR INVESTMENT - Loan Portfolio Held for Investment (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans held for investment | $ 13,048,684 |  | $ 12,746,556 |  |  |
ACL for loans and finance leases | (246,990) | $ (248,578) | (243,942) | $ (246,996) | $ (254,532) | $ (261,843)
Loans held for investment, net | 12,801,694 |  | 12,502,614 |  |  |
Puerto Rico and Virgin Islands regions [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans held for investment | 10,549,215 |  | 10,451,606 |  |  |
Florida region [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans held for investment | 2,499,469 |  | 2,294,950 |  |  |
Residential Portfolio Segment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans held for investment | 2,889,081 |  | 2,828,431 |  |  |
ACL for loans and finance leases | (40,272) | (42,448) | (40,654) | (40,651) | (46,051) | (57,397)
Residential Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans held for investment | 2,367,018 |  | 2,323,205 |  |  |
Residential Portfolio Segment [Member] | Florida region [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans held for investment | 522,063 |  | 505,226 |  |  |
Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans held for investment | 259,863 |  | 228,396 |  |  |
ACL for loans and finance leases | (5,360) | (4,551) | (3,824) | (3,998) | (5,646) | (5,605)
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Puerto Rico and Virgin Islands regions [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans held for investment | 235,313 |  | 184,427 |  |  |
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Florida region [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans held for investment | 24,550 |  | 43,969 |  |  |
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans held for investment | 2,549,375 |  | 2,565,984 |  |  |
ACL for loans and finance leases | (25,366) | (22,746) | (22,447) | (24,205) | (30,078) | (32,631)
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] | Puerto Rico and Virgin Islands regions [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans held for investment | 1,765,181 |  | 1,867,894 |  |  |
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] | Florida region [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans held for investment | 784,194 |  | 698,090 |  |  |
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member} |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans held for investment | 3,614,241 |  | 3,366,038 |  |  |
ACL for loans and finance leases | (37,854) | (39,359) | (33,034) | (35,099) | (35,440) | (33,996)
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member} | Puerto Rico and Virgin Islands regions [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans held for investment | 2,451,416 |  | 2,325,875 |  |  |
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member} | Florida region [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans held for investment | 1,162,825 |  | 1,040,163 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans held for investment | 3,736,124 |  | 3,757,707 |  |  |
ACL for loans and finance leases | (138,138) | $ (139,474) | (143,983) | $ (143,043) | $ (137,317) | $ (132,214)
Consumer Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans held for investment | 3,730,287 |  | 3,750,205 |  |  |
Consumer Portfolio Segment [Member] | Florida region [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans held for investment | $ 5,837 |  | $ 7,502 |  |  |

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