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DEBT SECURITIES - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Schedule Of Investments [Line Items]                
Investments purchased, classified as availalbe-for-sale debt securities $ 28,000,000.0   $ 28,037,000 $ 961,000        
Fair value 4,957,311,000   4,957,311,000     $ 5,229,984,000    
Gross Unrealized Losses 637,490,000   637,490,000     633,049,000    
Available-for-sale, allowance for credit losses 549,000 $ 433,000 549,000 433,000 $ 442,000 511,000 $ 449,000 $ 458,000
Provision For Other Credit Losses Previous Expected Credit Losses (60,000) 16,000 9,000 25,000        
Allowance for credit losses, Held-to-Maturity securities 1,267,000   1,267,000     2,197,000    
Debt Securities, Held-to-maturity 344,435,000   344,435,000     354,178,000    
Accrued interest receivable 77,895,000   77,895,000     77,716,000    
Held to maturity securities classified as cash and cash equivalents 0   0     0    
Past Due [Member]                
Schedule Of Investments [Line Items]                
Debt Securities, Held-to-maturity 0   0     0    
Puerto Rico government obligations [Member]                
Schedule Of Investments [Line Items]                
Available-for-sale, allowance for credit losses 386,000 350,000 386,000 350,000 326,000 395,000 366,000 375,000
Provision For Other Credit Losses Previous Expected Credit Losses (60,000) 16,000 9,000 25,000        
Residential MBS [Member]                
Schedule Of Investments [Line Items]                
Fair value 2,430,965,000   2,430,965,000     2,633,161,000    
Gross Unrealized Losses 462,515,000   462,515,000     436,055,000    
Available-for-sale, allowance for credit losses 163,000   163,000     116,000    
Allowance for credit losses, Held-to-Maturity securities 0   0     0    
Debt Securities, Held-to-maturity 138,615,000   138,615,000     146,468,000    
Residential MBS [Member] | Private label [Member]                
Schedule Of Investments [Line Items]                
Fair value 4,567,000   4,567,000          
Gross Unrealized Losses 1,951,000   1,951,000          
Available-for-sale, allowance for credit losses $ 163,000   $ 163,000     100,000    
Residential MBS [Member] | 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%          
Residential MBS [Member] | SOFR [Member] | Private label [Member]                
Schedule Of Investments [Line Items]                
Spread on variable rate     0.26161%          
Debt Instrument Description Of Variable Rate Basis     3-month CME Term SOFR          
Residential MBS [Member] | Private label [Member]                
Schedule Of Investments [Line Items]                
Available-for-sale, allowance for credit losses $ 163,000 83,000 $ 163,000 83,000 $ 116,000 116,000 $ 83,000 $ 83,000
Provision For Other Credit Losses Previous Expected Credit Losses 0 $ 0 0 $ 0        
Available-for-sale Securities [Member]                
Schedule Of Investments [Line Items]                
Accrued interest receivable 10,000,000.0   10,000,000.0     10,600,000    
Held-to-maturity Securities [Member]                
Schedule Of Investments [Line Items]                
Accrued interest receivable $ 4,800,000   $ 4,800,000     $ 4,800,000