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DEBT SECURITIES - Additional Information (Detail) - USD ($)
 12 Months Ended
Sep. 01, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Schedule Of Investments [Line Items]            
Proceeds from sales of available-for-sale debt securities   $ 0 $ 0 $ 1,195,250,000    
Available-for-sale realized gains       13,300,000    
Available-for-sale gross realized losses       100,000    
Available-for-sale net gain       13,200,000    
Fair value   5,599,520,000 6,453,761,000      
Gross Unrealized Losses   798,466,000 108,537,000      
Available-for-sale, allowance for credit losses   458,000 1,105,000      
Allowance for credit losses, Held-to-Maturity securities   8,286,000 8,571,000      
Debt Securities, Held-to-maturity   437,537,000 178,133,000      
Interest Receivable   69,730,000 61,507,000      
Securities Held To Maturity, Purchased   289,900,000        
Interest income on available for sale debt securities   86,100,000 62,700,000 49,000,000.0    
Interest income, held to maturity securities   15,500,000 8,800,000 7,600,000    
Held to maturity securities classified as cash and cash equivalents   0 0      
Past Due [Member]            
Schedule Of Investments [Line Items]            
Debt Securities, Held-to-maturity   0 0      
Municipal Bonds [Member] | Puerto Rico [Member]            
Schedule Of Investments [Line Items]            
Allowance for credit losses, Held-to-Maturity securities   8,286,000 8,571,000 8,845,000   $ 0
Initial allowance on PCD debt securities $ 1,269,000 0 0      
Provision for credit loss expense   (285,000) (274,000) (558,000)    
Debt Securities, Held-to-maturity   165,710,000        
Debt Securities Held To Maturity Allowance For Credit Loss Period Increase Decrease   300,000        
Municipal Bonds [Member] | Puerto Rico [Member] | ASC 326 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]            
Schedule Of Investments [Line Items]            
Allowance for credit losses, Held-to-Maturity securities     0 0 $ 8,134,000  
Puerto Rico government obligations [Member]            
Schedule Of Investments [Line Items]            
Available-for-sale, allowance for credit losses   400,000 300,000      
MBS [Member]            
Schedule Of Investments [Line Items]            
Fair value   3,104,591,000 4,044,443,000      
Gross Unrealized Losses   548,297,000 66,477,000      
Available-for-sale, allowance for credit losses   83,000 797,000      
Allowance for credit losses, Held-to-Maturity securities   0        
Debt Securities, Held-to-maturity   271,827,000        
MBS And Government Obligations Held By International Banking Entities [Member]            
Schedule Of Investments [Line Items]            
Interest income on available for sale debt securities   40,700,000 25,700,000 38,500,000    
Interest income, held to maturity securities   15,400,000 8,800,000 7,600,000    
Residential Pass-Through Mortgage Backed Securities Issued By PRHFA [Member]            
Schedule Of Investments [Line Items]            
Fair value   2,200,000        
Gross Unrealized Losses   1,100,000        
Provision For Other Credit Losses No Previous Expected Credit Losses   400,000        
Available-for-sale Securities [Member]            
Schedule Of Investments [Line Items]            
Available-for-sale, allowance for credit losses   458,000 1,105,000 1,310,000   0
Provision For Other Credit Losses Previous Expected Credit Losses   434,000 136,000 (1,641,000)    
Charge-offs   213,000 69,000 331,000    
Available-for-sale Securities [Member] | Puerto Rico government obligations [Member]            
Schedule Of Investments [Line Items]            
Available-for-sale, allowance for credit losses   375,000 308,000 308,000   0
Provision For Other Credit Losses Previous Expected Credit Losses   (67,000) 0 (308,000)    
Charge-offs   0 0 0    
Available-for-sale Securities [Member] | MBS [Member] | Private label [Member]            
Schedule Of Investments [Line Items]            
Available-for-sale, allowance for credit losses   83,000 797,000 1,002,000   $ 0
Provision For Other Credit Losses Previous Expected Credit Losses   501,000 136,000 (1,333,000)    
Charge-offs   $ 213,000 $ 69,000 $ 331,000    
Available-for-sale Securities [Member] | MBS [Member] | Private label [Member] | FICO Score, Greater than 700 [Member] | LTV Less than 80 Percent [Member]            
Schedule Of Investments [Line Items]            
Financing Receivable, Credit Quality, Additional Information   The underlying collateral is fixed-rate, single-family residential mortgage loans in the United States with original FICO scores over 700 and moderate loan-to-value ratios (under 80%), as well as moderate delinquency levels.        
Available-for-sale Securities [Member] | MBS [Member] | Private label [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Schedule Of Investments [Line Items]            
Loans Receivable, Description of Variable Rate Basis   The interest rate on these private-label MBS is variable, tied to 3-month LIBOR, and limited to the weighted-average coupon on the underlying collateral.