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DEBT SECURITIES - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Schedule Of Investments [Line Items]                
Fair value $ 5,433,369   $ 5,433,369     $ 5,599,520    
Gross Unrealized Losses 765,955   765,955     798,466    
Available-for-sale, allowance for credit losses 433 $ 676 433 $ 676 $ 449 458 $ 711 $ 1,105
Provision For Other Credit Losses Previous Expected Credit Losses 16 35 25 423        
Charge-offs   0   (6)        
Allowance for credit losses, Held-to-Maturity securities 8,401   8,401     8,286    
Debt Securities, Held-to-maturity 424,726   424,726     437,537    
Interest Receivable $ 70,368   $ 70,368     69,730    
FICO Score, Greater than 700 [Member] | LTV Less than 80 Percent [Member] | Private label [Member]                
Schedule Of Investments [Line Items]                
Loan To Value Coverage Percentage 80.00%   80.00%          
London Interbank Offered Rate (LIBOR) [Member]                
Schedule Of Investments [Line Items]                
Debt Instrument Description Of Variable Rate Basis     3-month LIBOR          
SOFR [Member]                
Schedule Of Investments [Line Items]                
Spread on variable rate     0.26161%          
Municipal Bonds [Member] | Puerto Rico [Member]                
Schedule Of Investments [Line Items]                
Allowance for credit losses, Held-to-Maturity securities $ 8,401 8,885 $ 8,401 8,885 7,646 8,286 12,324 8,571
Provision for credit loss expense 755 (3,439) 115 314        
Debt Securities, Held-to-maturity 166,124   166,124     165,710    
Puerto Rico government obligations [Member]                
Schedule Of Investments [Line Items]                
Available-for-sale, allowance for credit losses 350 386 350 386 366 375 308 308
Provision For Other Credit Losses Previous Expected Credit Losses 16 (78) 25 (78)        
Charge-offs   0   0        
Residential Mortgage Backed Securities [Member]                
Schedule Of Investments [Line Items]                
Fair value 2,759,697   2,759,697     2,941,458    
Gross Unrealized Losses 501,867   501,867     514,499    
Available-for-sale, allowance for credit losses 84   84     83    
Allowance for credit losses, Held-to-Maturity securities 0   0     0    
Debt Securities, Held-to-maturity 155,690   155,690     166,739    
Residential Mortgage Backed Securities [Member] | Private label [Member]                
Schedule Of Investments [Line Items]                
Available-for-sale, allowance for credit losses 100   100     100    
Residential Mortgage Backed Securities [Member] | Private label [Member]                
Schedule Of Investments [Line Items]                
Available-for-sale, allowance for credit losses 83 290 83 290 $ 83 $ 83 $ 403 $ 797
Provision For Other Credit Losses Previous Expected Credit Losses $ 0 113 $ 0 501        
Charge-offs   $ 0   $ (6)