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DEBT SECURITIES - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Schedule Of Investments [Line Items]                
Investments purchased, classified as available-for-sale debt securities     $ 44,063,000 $ 5,458,000        
Fair value $ 4,894,781,000   4,894,781,000     $ 5,229,984,000    
Gross Unrealized Losses 478,444,000   478,444,000     633,049,000    
Available-for-sale, allowance for credit losses 526,000 $ 465,000 526,000 465,000 $ 549,000 511,000 $ 433,000 $ 458,000
Provision For Other Credit Losses Previous Expected Credit Losses 36,000 (32,000) 45,000 (7,000)        
Allowance for credit losses, Held-to-Maturity securities 1,119,000   1,119,000     2,197,000    
Debt Securities, Held-to-maturity 323,142,000   323,142,000     354,178,000    
Accrued interest receivableAccrued interest receivable 67,112,000   67,112,000     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 350,000 382,000 350,000 382,000 386,000 395,000 350,000 375,000
Provision For Other Credit Losses Previous Expected Credit Losses 36,000 (32,000) 45,000 (7,000)        
Residential MBS [Member]                
Schedule Of Investments [Line Items]                
Fair value 2,438,532,000   2,438,532,000     2,633,161,000    
Gross Unrealized Losses 359,454,000   359,454,000     436,055,000    
Available-for-sale, allowance for credit losses 176,000   176,000     116,000    
Allowance for credit losses, Held-to-Maturity securities 0   0     0    
Debt Securities, Held-to-maturity 133,852,000   133,852,000     146,468,000    
Residential MBS [Member] | Private label [Member]                
Schedule Of Investments [Line Items]                
Fair value 4,321,000   4,321,000          
Gross Unrealized Losses 1,848,000   1,848,000          
Available-for-sale, allowance for credit losses $ 176,000   $ 176,000     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 $ 176,000 83,000 $ 176,000 83,000 $ 163,000 116,000 $ 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 receivableAccrued interest receivable 9,500,000   9,500,000     10,600,000    
Held-to-maturity Securities [Member]                
Schedule Of Investments [Line Items]                
Accrued interest receivableAccrued interest receivable $ 2,500,000   $ 2,500,000     $ 4,800,000