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STOCKHOLDERS' EQUITY - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jul. 22, 2024
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Mar. 31, 2024
Dec. 31, 2023
Jul. 24, 2023
Mar. 31, 2023
Dec. 31, 2022
Class Of Stock [Line Items]                    
Dividends declared per common share   $ 0.16 $ 0.14 $ 0.32 $ 0.28          
Preferred Stock Shares Authorized   50,000,000   50,000,000            
Preferred stock, par value   $ 1.00   $ 1.00            
Treasury Stock Shares Acquired   2,840,591 0 5,983,180 3,865,375          
Treasury Stock Shares   59,797,663 43,906,494 59,797,663 43,906,494 56,956,069 54,360,304   43,874,418 40,954,057
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 Amount   $ 199,576,000   $ 199,576,000     $ 199,576,000      
Preferred Stock Shares Outstanding   0   0     0      
Stock Issued During Period Shares Treasury Stock Reissued   556 0 549,285 970,429          
Dividends paid on common stock   $ 26,600,000 $ 25,300,000 $ 53,400,000 $ 50,700,000          
Common stock per share paid   $ 0.16 $ 0.14 $ 0.32 $ 0.28          
Stock Repurchase Program Announced July 24, 2023 [Member]                    
Class Of Stock [Line Items]                    
Treasury Stock Shares Acquired   2,840,321   5,846,872            
Common stock repurchased price per share   $ 17.60   $ 17.10            
Repurchase program authorized amount               $ 225,000,000    
Stock Repurchase Program Remaining Authorized Repurchase Amount 1   $ 50,000,000.0   $ 50,000,000.0            
Common stock repurchase value   $ 50,000,000.0   $ 100,000,000.0            
Repurchase Program Announced July 22, 2024 [Member]                    
Class Of Stock [Line Items]                    
Repurchase program authorized amount $ 250,000,000                  
Subsequent Event [Member]                    
Class Of Stock [Line Items]                    
Dividends declared per common share $ 0.16                  
Dividend Payable Date To Be Paid Day Month And Year Sep. 13, 2024                  
Dividends Payable Date Of Record Day Month And Year Aug. 29, 2024                  
Dividends Payable Date Declared Day Month And Year Jul. 22, 2024