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FAIR VLUE - Assets and Liabilites Measured at Fair Value on Recurring Basis Using Unobservable Inputs (Level 3) (Detail) $ in Thousands | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
--- | --- | ---
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale | $ 6,689,479 | $ 4,647,019
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Private label [Member] | Discounted Cash Flow [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale | 7,574 | 8,428
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Puerto Rico Government obligations [Member] | Discounted Cash Flow [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale | $ 2,894 | $ 2,899
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Private label [Member] | Discount rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.127 | 0.122
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Private label [Member] | Prepayment rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.048 | 0.012
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Private label [Member] | Projected Cumulative Loss Rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.002 | 0.026
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Puerto Rico Government obligations [Member] | Discount rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.067 | 0.079
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Puerto Rico Government obligations [Member] | Projected Cumulative Loss Rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.107 | 0.124
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Private label [Member] | Discount rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.127 | 0.122
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Private label [Member] | Prepayment rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.241 | 0.188
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Private label [Member] | Projected Cumulative Loss Rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.186 | 0.223
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Puerto Rico Government obligations [Member] | Discount rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.067 | 0.079
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Puerto Rico Government obligations [Member] | Projected Cumulative Loss Rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.107 | 0.124
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Private label [Member] | Discount rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.127 | 0.122
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Private label [Member] | Prepayment rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.158 | 0.121
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Private label [Member] | Projected Cumulative Loss Rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.096 | 0.102
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Puerto Rico Government obligations [Member] | Discount rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.067 | 0.079
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Puerto Rico Government obligations [Member] | Projected Cumulative Loss Rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.107 | 0.124

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