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FAIR VALUE - Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Available For Sale Securities [Abstract] |  |
Available-For-Sale Securities, Debt Securities | $ 4,565,302 | $ 5,229,984
Residential MBS [Member] |  |
Available For Sale Securities [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 2,481,253 | 2,633,161
Residential MBS [Member] | Private label [Member] |  |
Available For Sale Securities [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 4,195 |
Fair Value, Measurements, Recurring [Member] | Puerto Rico government obligations [Member] |  |
Available For Sale Securities [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 1,620 | 1,415
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Residential MBS [Member] | Private label [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Available For Sale Securities [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 4,195 | 4,785
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Puerto Rico government obligations [Member] |  |
Available For Sale Securities [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 1,620 | 1,415
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Puerto Rico government obligations [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Available For Sale Securities [Abstract] |  |
Available-For-Sale Securities, Debt Securities | $ 1,620 | $ 1,415
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Residential MBS [Member] | Private label [Member] | Measurement Input, Discount Rate [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.166 | 0.161
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Residential MBS [Member] | Private label [Member] | Measurement Input, Constant Prepayment Rate [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.000 | 0.000
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Residential MBS [Member] | Private label [Member] | Measurement Input, Loss Severity [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.001 | 0.001
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Puerto Rico government obligations [Member] | Measurement Input, Discount Rate [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.115 | 0.141
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Puerto Rico government obligations [Member] | Measurement Input, Loss Severity [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.239 | 0.258
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Residential MBS [Member] | Private label [Member] | Measurement Input, Discount Rate [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.166 | 0.161
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Residential MBS [Member] | Private label [Member] | Measurement Input, Constant Prepayment Rate [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.057 | 0.069
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Residential MBS [Member] | Private label [Member] | Measurement Input, Loss Severity [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.101 | 0.109
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Puerto Rico government obligations [Member] | Measurement Input, Discount Rate [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.115 | 0.141
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Puerto Rico government obligations [Member] | Measurement Input, Loss Severity [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.239 | 0.258
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Residential MBS [Member] | Private label [Member] | Measurement Input, Discount Rate [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.166 | 0.161
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Residential MBS [Member] | Private label [Member] | Measurement Input, Constant Prepayment Rate [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.032 | 0.037
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Residential MBS [Member] | Private label [Member] | Measurement Input, Loss Severity [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.049 | 0.042
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Puerto Rico government obligations [Member] | Measurement Input, Discount Rate [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.115 | 0.141
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Puerto Rico government obligations [Member] | Measurement Input, Loss Severity [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.239 | 0.258

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