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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
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Available For Sale Securities [Abstract]    
Available-For-Sale Securities, Debt Securities $ 5,229,984 $ 5,599,520
Fair Value, Measurements, Recurring [Member] | Puerto Rico government obligations [Member]    
Available For Sale Securities [Abstract]    
Available-For-Sale Securities, Debt Securities 1,415 2,201
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Private label [Member] | Valuation Technique, Discounted Cash Flow [Member] | Residential Portfolio Segment [Member]    
Available For Sale Securities [Abstract]    
Available-For-Sale Securities, Debt Securities 4,785 5,794
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Puerto Rico government obligations [Member]    
Available For Sale Securities [Abstract]    
Available-For-Sale Securities, Debt Securities 1,415 2,201
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]    
Available-For-Sale Securities, Debt Securities $ 1,415 $ 2,201
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Private label [Member] | Measurement Input, Discount Rate [Member] | Residential Portfolio Segment [Member]    
Available For Sale Securities [Abstract]    
Debt Securities, Available-for-sale, Measurement Input 0.161 0.162
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Private label [Member] | Measurement Input, Constant Prepayment Rate [Member] | Residential Portfolio Segment [Member]    
Available For Sale Securities [Abstract]    
Debt Securities, Available-for-sale, Measurement Input 0.000 0.015
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Private label [Member] | Measurement Input, Loss Severity [Member] | Residential Portfolio Segment [Member]    
Available For Sale Securities [Abstract]    
Debt Securities, Available-for-sale, Measurement Input 0.001 0.003
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 0.141 0.129
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 0.258 0.193
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Private label [Member] | Measurement Input, Discount Rate [Member] | Residential Portfolio Segment [Member]    
Available For Sale Securities [Abstract]    
Debt Securities, Available-for-sale, Measurement Input 0.161 0.162
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Private label [Member] | Measurement Input, Constant Prepayment Rate [Member] | Residential Portfolio Segment [Member]    
Available For Sale Securities [Abstract]    
Debt Securities, Available-for-sale, Measurement Input 0.069 0.152
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Private label [Member] | Measurement Input, Loss Severity [Member] | Residential Portfolio Segment [Member]    
Available For Sale Securities [Abstract]    
Debt Securities, Available-for-sale, Measurement Input 0.109 0.156
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 0.141 0.129
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 0.258 0.193
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Private label [Member] | Measurement Input, Discount Rate [Member] | Residential Portfolio Segment [Member]    
Available For Sale Securities [Abstract]    
Debt Securities, Available-for-sale, Measurement Input 0.161 0.162
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Private label [Member] | Measurement Input, Constant Prepayment Rate [Member] | Residential Portfolio Segment [Member]    
Available For Sale Securities [Abstract]    
Debt Securities, Available-for-sale, Measurement Input 0.037 0.118
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Private label [Member] | Measurement Input, Loss Severity [Member] | Residential Portfolio Segment [Member]    
Available For Sale Securities [Abstract]    
Debt Securities, Available-for-sale, Measurement Input 0.042 0.056
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 0.141 0.129
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 0.258 0.193