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BORROWINGS AND RELATED INTEREST (OFG’s Repurchase Agreements, Excluding Accrued Interest) (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Instrument [Line Items] |  |
Securities sold under agreements to repurchase | $ 100,791 | $ 75,222
FNMA and FHLMC Certificates |  |
Debt Instrument [Line Items] |  |
Amortized Cost of Underlying Securities | 103,977 | 81,409
Securities sold under agreements to repurchase | 100,000 | 75,000
Approximate Fair Value of Underlying Securities | $ 106,444 | $ 80,968
Weighted Average Interest Rate of Security | 5.20% | 5.25%
Securities Sold under Agreements to Repurchase |  |
Debt Instrument [Line Items] |  |
Accrued interest payable | $ 791 | $ 222
Securities Sold under Agreements to Repurchase | Under 90 days |  |
Debt Instrument [Line Items] |  |
Securities sold under agreements to repurchase | 0 | 75,000
Securities Sold under Agreements to Repurchase | Over one to three years |  |
Debt Instrument [Line Items] |  |
Securities sold under agreements to repurchase | 100,000 | 0
Securities Sold under Agreements to Repurchase | Short-term Fixed-rate Repurchase Agreements |  |
Debt Instrument [Line Items] |  |
Securities sold under agreements to repurchase | $ 100,000 | $ 75,000
Weighted Average Interest Rate of Security | 4.07% | 4.63%

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