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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 ($)
Dec. 31, 2021
USD ($)
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