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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 | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
--- | --- | ---
Available For Sale Securities [Abstract] |  |
Available-For-Sale Securities, Debt Securities | $ 4,312,884 | $ 4,565,302
Residential MBS [Member] |  |
Available For Sale Securities [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 2,441,885 | 2,481,253
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 | 1,599 | 1,620
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 | 4,034 | 4,195
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 | 1,599 | 1,620
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 | $ 1,599 | $ 1,620
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 | 0.162 | 0.166
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 | 0.016 | 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 | 0.116 | 0.115
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 | 0.240 | 0.239
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 | 0.162 | 0.166
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 | 0.031 | 0.057
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 | 0.098 | 0.101
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 | 0.116 | 0.115
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 | 0.240 | 0.239
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 | 0.162 | 0.166
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 | 0.025 | 0.032
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 | 0.042 | 0.049
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 | 0.116 | 0.115
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 | 0.240 | 0.239

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