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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
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Available For Sale Securities [Abstract]    
Debt Securities, Available-for-sale $ 6,424,660 $ 6,453,761
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 0.088 0.086
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 0.088 0.086
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 0.088 0.086
Fair Value, Measurements, Recurring [Member] | Private label [Member]    
Available For Sale Securities [Abstract]    
Debt Securities, Available-for-sale $ 6,920 $ 7,234
Fair Value, Measurements, Recurring [Member] | Puerto Rico government obligations [Member]    
Available For Sale Securities [Abstract]    
Debt Securities, Available-for-sale 2,727 2,850
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Private label [Member]    
Available For Sale Securities [Abstract]    
Debt Securities, Available-for-sale 6,920 7,234
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 6,920 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 2,727 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 $ 2,727 $ 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 14.3 12.9
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 9.4 7.6
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 0.3 0.2
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 6.3 6.6
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 14.3 12.9
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 24.1 24.9
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 14.9 15.7
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 8.6 8.4
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 14.3 12.9
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 14.4 15.2
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 6.5 7.6
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 8.4 7.9