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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, 2022 USD ($) | Dec. 31, 2021 USD ($)
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Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale | $ 5,668,689 | $ 6,453,761
Fair Value, Measurements, Recurring [Member] | Puerto Rico government obligations [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale | 2,193 | 2,850
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Private label [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale | 6,170 | 7,234
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Puerto Rico government obligations [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale | 2,193 | 2,850
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] |  |
Debt Securities, Available-for-sale | $ 2,193 | $ 2,850
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Private label [Member] | Measurement Input, Discount Rate [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.164 | 0.129
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Private label [Member] | Measurement Input, Constant Prepayment Rate [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.019 | 0.076
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Private label [Member] | Measurement Input, Loss Severity [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.002 | 0.002
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 | 0.130 | 0.066
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 | 0.190 | 0.086
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Private label [Member] | Measurement Input, Discount Rate [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.164 | 0.129
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Private label [Member] | Measurement Input, Constant Prepayment Rate [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.174 | 0.249
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Private label [Member] | Measurement Input, Loss Severity [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.173 | 0.157
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 | 0.130 | 0.084
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 | 0.190 | 0.086
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Private label [Member] | Measurement Input, Discount Rate [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.164 | 0.129
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Private label [Member] | Measurement Input, Constant Prepayment Rate [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.126 | 0.152
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Private label [Member] | Measurement Input, Loss Severity [Member] |  |
Available For Sale Securities [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.069 | 0.076
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 | 0.130 | 0.079
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 | 0.190 | 0.086

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