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STOCKHOLDERS' EQUITY - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 21, 2025
Aug. 05, 2025
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2025
Dec. 31, 2024
Jul. 22, 2024
Mar. 31, 2024
Dec. 31, 2023
Class Of Stock [Line Items]                      
Dividends declared per common share     $ 0.18 $ 0.16 $ 0.36 $ 0.32          
Preferred Stock Shares Authorized     50,000,000   50,000,000            
Preferred stock, par value     $ 1.00   $ 1.00            
Treasury Stock Shares Acquired     1,589,748 2,840,591 2,966,564 5,983,180          
Treasury Stock Shares     62,155,321 59,797,663 62,155,321 59,797,663 60,558,935 59,794,239   56,956,069 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     0 556 614,300 549,285          
Dividends paid on common stock     $ 29,000,000.0 $ 26,600,000 $ 58,600,000 $ 53,400,000          
Common stock per share paid     $ 0.18 $ 0.16 $ 0.36 $ 0.32          
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         2,778,298            
Common stock repurchased price per share         $ 18.00            
Remaining authorization to repurchase     88,300,000   $ 88,300,000            
Repurchase program authorize amount                 $ 250,000,000    
Common stock repurchase value         50,000,000.0            
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                    
Remaining authorization to repurchase   $ 66,600,000                  
Subsequent Event [Member] | O2025 Q2 Dividends [Member]                      
Class Of Stock [Line Items]                      
Dividend Payable Date To Be Paid Day Month And Year Sep. 12, 2025                    
Dividends Payable Date Of Record Day Month And Year Aug. 28, 2025                    
Dividends Payable Date Declared Day Month And Year Jul. 21, 2025                    
Subsequent Event [Member] | Stock Repurchase Program Announced July 22, 2024 [Member]                      
Class Of Stock [Line Items]                      
Treasury Stock Shares Acquired   1,038,151                  
Common stock repurchase value   $ 21,700,000