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FAIR VLUE - Assets and Liabilites Measured at Fair Value on Recurring Basis Using Unobservable Inputs (Level 3) (Detail) $ in Thousands | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | ---
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale | $ 1,803,688 | $ 1,942,568
Minimum [Member] | Private label MBS [Member] | Discount rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.138 | 0.145
Minimum [Member] | Private label MBS [Member] | Projected Cumulative Loss Rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.000 | 0.000
Maximum [Member] | Private label MBS [Member] | Discount rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.138 | 0.145
Maximum [Member] | Private label MBS [Member] | Projected Cumulative Loss Rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.066 | 0.068
Weighted Average [Member] | Private label MBS [Member] | Discount rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.138 | 0.145
Weighted Average [Member] | Private label MBS [Member] | Projected Cumulative Loss Rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.031 | 0.03
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Private label MBS [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale | $ 12,507 | $ 13,914
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Puerto Rico Government obligations [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale | $ 2,899 | $ 2,824
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Private label MBS [Member] | Discount rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.138 | 0.145
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Private label MBS [Member] | Prepayment rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.033 | 0.033
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Private label MBS [Member] | Projected Cumulative Loss Rate [Member] |  |
Debt Securities, Available-for-sale, Sale [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] | Puerto Rico Government obligations [Member] | Discount rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.069 | 0.063
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Puerto Rico Government obligations [Member] | Prepayment rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.030 | 0.030
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Private label MBS [Member] | Discount rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.138 | 0.145
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Private label MBS [Member] | Prepayment rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.170 | 0.209
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Private label MBS [Member] | Projected Cumulative Loss Rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.066 | 0.068
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 | 0.069 | 0.063
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Puerto Rico Government obligations [Member] | Prepayment rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.030 | 0.030
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Private label MBS [Member] | Discount rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.138 | 0.145
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Private label MBS [Member] | Prepayment rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.091 | 0.114
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Private label MBS [Member] | Projected Cumulative Loss Rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.031 | 0.030
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 | 0.069 | 0.063
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Puerto Rico Government obligations [Member] | Prepayment rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.030 | 0.030

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