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BORROWINGS AND RELATED INTEREST (OFG’s Repurchase Agreements, Excluding Accrued Interest) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Instrument [Line Items] |  |
Balance of Borrowing | $ 150,701 | $ 0
FNMA and FHMLC Certificates |  |
Debt Instrument [Line Items] |  |
Amortized Cost of Underlying Securities | 183,004 |
Balance of Borrowing | 150,633 |
Approximate Fair Value of Underlying Securities | $ 161,973 |
Weighted Average Interest Rate of Security | 2.95% |
Securities Sold under Agreements to Repurchase |  |
Debt Instrument [Line Items] |  |
Balance of Borrowing |  | $ 0
Securities Sold under Agreements to Repurchase | Under 90 days |  |
Debt Instrument [Line Items] |  |
Balance of Borrowing | $ 150,633 |
Securities Sold under Agreements to Repurchase | Short-term Fixed-rate Repurchase Agreements |  |
Debt Instrument [Line Items] |  |
Balance of Borrowing | $ 150,633 |
Weighted Average Interest Rate of Security | 5.47% |

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