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STOCKHOLDERS' EQUITY - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended
Apr. 24, 2025
May 05, 2025
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Jul. 22, 2024
Dec. 31, 2023
Class Of Stock [Line Items]              
Dividends declared per common share     $ 0.18 $ 0.16      
Preferred Stock Shares Authorized     50,000,000        
Preferred stock, par value     $ 1.00        
Treasury Stock Shares Acquired     1,376,816 3,142,589      
Treasury Stock Shares     60,558,935 56,956,069 59,794,239   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        
Remaining authorization to repurchase     127,700,000        
Legal Surplus Amount     $ 230,178,000   $ 230,178,000    
Preferred Stock Shares Outstanding     0   0    
Stock Issued During Period Shares Treasury Stock Reissued     614,300 548,729      
Dividends paid on common stock     $ 29,600,000 $ 26,900,000      
Common stock per share paid     $ 0.18 $ 0.16      
Trust Preferred Securities [Member] | Parent Company [Member] | Junior Subordinated Debt [Member]              
Class Of Stock [Line Items]              
Repurchased face amount     $ 50,600,000        
Trust Preferred Securities [Member] | Statutory Trust Two [Member] | Parent Company [Member] | Junior Subordinated Debt [Member]              
Class Of Stock [Line Items]              
Trust preferred securities repurchased     18,000,000.0        
Repurchased face amount     $ 18,600,000        
Stock Repurchase Program Announced July 24, 2023 [Member]              
Class Of Stock [Line Items]              
Treasury Stock Shares Acquired     1,194,567        
Common stock repurchased price per share     $ 18.21        
Common stock repurchase value     $ 21,800,000        
Stock Repurchase Program Announced July 22, 2024 [Member]              
Class Of Stock [Line Items]              
Repurchase program authorize amount           $ 250,000,000  
Subsequent Event [Member]              
Class Of Stock [Line Items]              
Dividends declared per common share $ 0.18            
Remaining authorization to repurchase   $ 100,000,000.0          
Subsequent Event [Member] | O2025 Q2 Dividends [Member]              
Class Of Stock [Line Items]              
Dividend Payable Date To Be Paid Day Month And Year Jun. 13, 2025            
Dividends Payable Date Of Record Day Month And Year May 29, 2025            
Dividends Payable Date Declared Day Month And Year Apr. 24, 2025            
Subsequent Event [Member] | Stock Repurchase Program Announced July 22, 2024 [Member]              
Class Of Stock [Line Items]              
Treasury Stock Shares Acquired   1,556,440          
Common stock repurchase value   $ 27,700,000