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DEBT SECURITIES - Additional Information (Details) - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Schedule Of Investments [Line Items]        
Investments purchased, classified as available-for-sale debt securities $ 12,264,000 $ 0    
Fair value 4,312,884,000   $ 4,565,302,000  
Gross Unrealized Losses 477,114,000   559,768,000  
Available-for-sale, allowance for credit losses 516,000 442,000 521,000 $ 511,000
Provision For Other Credit Losses Previous Expected Credit Losses 5,000 69,000    
Allowance for credit losses, Held-to-Maturity securities 843,000   802,000  
Provision for credit loss expense 36,000 (1,031,000)    
Debt Securities, Held-to-maturity 312,807,000   317,786,000  
Accrued interest receivable on loans and investments 63,777,000   71,881,000  
Past Due [Member]        
Schedule Of Investments [Line Items]        
Debt Securities, Held-to-maturity 0   0  
Municipal Bonds [Member]        
Schedule Of Investments [Line Items]        
Allowance for credit losses, Held-to-Maturity securities 900,000   800,000  
Puerto Rico government obligations [Member]        
Schedule Of Investments [Line Items]        
Available-for-sale, allowance for credit losses 340,000 326,000 345,000 395,000
Provision For Other Credit Losses Previous Expected Credit Losses 5,000 69,000    
Residential MBS [Member]        
Schedule Of Investments [Line Items]        
Fair value 2,441,885,000   2,481,253,000  
Gross Unrealized Losses 380,857,000   440,826,000  
Available-for-sale, allowance for credit losses 176,000   176,000  
Allowance for credit losses, Held-to-Maturity securities 0   0  
Debt Securities, Held-to-maturity 125,556,000   129,319,000  
Residential MBS [Member] | Private label [Member]        
Schedule Of Investments [Line Items]        
Fair value     4,195,000  
Gross Unrealized Losses     1,715,000  
Available-for-sale, allowance for credit losses 176,000 116,000 176,000 $ 116,000
Provision For Other Credit Losses Previous Expected Credit Losses $ 0 $ 0    
Residential MBS [Member] | Private label [Member] | FICO Score, Greater than 700 [Member] | LTV Less than 80 Percent [Member]        
Schedule Of Investments [Line Items]        
Loan To Value Coverage Percentage 80.00%      
Residential MBS [Member] | Private label [Member] | SOFR [Member]        
Schedule Of Investments [Line Items]        
Spread on variable rate 0.26161%      
Debt Instrument Description Of Variable Rate Basis 3-month CME Term SOFR      
Commercial MBS [Member]        
Schedule Of Investments [Line Items]        
Investments purchased, classified as available-for-sale debt securities $ 7,300,000      
Fair value 190,417,000   181,909,000  
Gross Unrealized Losses 38,115,000   41,097,000  
Available-for-sale, allowance for credit losses 0   0  
Allowance for credit losses, Held-to-Maturity securities 0   0  
Debt Securities, Held-to-maturity 94,729,000   96,025,000  
Available-for-Sale Securities [Member]        
Schedule Of Investments [Line Items]        
Accrued interest receivable on loans and investments 9,000,000.0   9,600,000  
Held-to-Maturity Securities [Member]        
Schedule Of Investments [Line Items]        
Accrued interest receivable on loans and investments $ 2,300,000   $ 4,100,000