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FAIR VALUE - Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) $ in Thousands | Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
--- | --- | ---
Available For Sale Securities [Abstract] |  |
Available-For-Sale Securities, Debt Securities | $ 5,175,803 | $ 5,599,520
Fair Value, Measurements, Recurring [Member] | Puerto Rico government obligations [Member] |  |
Available For Sale Securities [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 1,448 | 2,201
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Private label [Member] | Valuation Technique, Discounted Cash Flow [Member] | Residential Portfolio Segment [Member] |  |
Available For Sale Securities [Abstract] |  |
Available-For-Sale Securities, Debt Securities | 4,918 | 5,794
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 | 1,448 | 2,201
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 | $ 1,448 | $ 2,201
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Private label [Member] | Measurement Input, Discount Rate [Member] | Residential Portfolio Segment [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.173 | 0.162
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Private label [Member] | Measurement Input, Constant Prepayment Rate [Member] | Residential Portfolio Segment [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.012 | 0.015
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Private label [Member] | Measurement Input, Loss Severity [Member] | Residential Portfolio Segment [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.002 | 0.003
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 | 0.139 | 0.129
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 | 0.245 | 0.193
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Private label [Member] | Measurement Input, Discount Rate [Member] | Residential Portfolio Segment [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.173 | 0.162
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Private label [Member] | Measurement Input, Constant Prepayment Rate [Member] | Residential Portfolio Segment [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.088 | 0.152
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Private label [Member] | Measurement Input, Loss Severity [Member] | Residential Portfolio Segment [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.137 | 0.156
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 | 0.139 | 0.129
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 | 0.245 | 0.193
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Private label [Member] | Measurement Input, Discount Rate [Member] | Residential Portfolio Segment [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.173 | 0.162
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Private label [Member] | Measurement Input, Constant Prepayment Rate [Member] | Residential Portfolio Segment [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.053 | 0.118
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Private label [Member] | Measurement Input, Loss Severity [Member] | Residential Portfolio Segment [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.055 | 0.056
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 | 0.139 | 0.129
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 | 0.245 | 0.193

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