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STOCKHOLDERS' EQUITY - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended
Oct. 22, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Dec. 31, 2024
Jul. 22, 2024
Jun. 30, 2024
Dec. 31, 2023
Class Of Stock [Line Items]                    
Dividends declared per common share   $ 0.18 $ 0.16 $ 0.54 $ 0.48          
Preferred Stock Shares Authorized   50,000,000   50,000,000            
Preferred stock, par value   $ 1.00   $ 1.00            
Treasury Stock Shares Acquired   2,386,504 898 5,353,068 5,984,078          
Treasury Stock Shares   64,528,220 59,787,306 64,528,220 59,787,306 62,155,321 59,794,239   59,797,663 54,360,304
Legal surplus reserve rate       10.00%            
Puerto Rico Banking Law Description       The Puerto Rico Banking Law provides that, when the expenditures of a Puerto Rico commercial bank are greater than receipts, the excess of the expenditures over receipts must be charged against the undistributed profits of the bank, and the balance, if any, must be charged against the legal surplus reserve, as a reduction thereof. If the legal surplus reserve is not sufficient to cover such balance in whole or in part, the outstanding amount must be charged against the capital account and the Bank cannot pay dividends until it can replenish the legal surplus reserve to an amount of at least 20% of the original capital contributed.            
Legal Surplus Amount Additions       $ 0            
Legal surplus reserve   $ 230,178,000   $ 230,178,000     $ 230,178,000      
Preferred Stock Shares Outstanding   0   0     0      
Stock Issued During Period Shares Treasury Stock Reissued   13,605 14,947 627,905 564,232          
Dividends paid on common stock   $ 28,700,000 $ 26,300,000 $ 87,400,000 $ 79,700,000          
Common stock per share paid   $ 0.18 $ 0.16 $ 0.54 $ 0.48          
Trust Preferred Securities [Member] | Parent Company [Member] | Junior Subordinated Debt [Member]                    
Class Of Stock [Line Items]                    
Repurchased face amount   $ 61,700,000   $ 61,700,000            
Stock Repurchase Program Announced July 22, 2024 [Member]                    
Class Of Stock [Line Items]                    
Treasury Stock Shares Acquired       5,158,809            
Common stock repurchased price per share       $ 19.38            
Remaining authorization to repurchase   38,300,000   $ 38,300,000            
Repurchase program authorize amount               $ 250,000,000    
Common stock repurchase value       100,000,000.0            
Stock Repurchase Program Announced July 22, 2024 [Member] | Trust Preferred Securities [Member] | Parent Company [Member] | Junior Subordinated Debt [Member]                    
Class Of Stock [Line Items]                    
Repurchased face amount   $ 61,700,000   $ 61,700,000            
Subsequent Event [Member]                    
Class Of Stock [Line Items]                    
Dividends declared per common share $ 0.18                  
Subsequent Event [Member] | O2025 Q2 Dividends [Member]                    
Class Of Stock [Line Items]                    
Dividend Payable Date To Be Paid Day Month And Year Dec. 12, 2025                  
Dividends Payable Date Of Record Day Month And Year Nov. 28, 2025                  
Dividends Payable Date Declared Day Month And Year Oct. 22, 2025                  
Subsequent Event [Member] | Stock Repurchase Program Announced October 22, 2025 [Member]                    
Class Of Stock [Line Items]                    
Repurchase program authorize amount $ 200,000,000