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STOCKHOLDERS' EQUITY - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 30, 2024
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Jul. 22, 2024
Jun. 30, 2024
Dec. 31, 2023
Jul. 24, 2023
Jun. 30, 2023
Dec. 31, 2022
Class Of Stock [Line Items]                        
Dividends declared per common share     $ 0.16 $ 0.14 $ 0.48 $ 0.42            
Preferred Stock Shares Authorized   50,000,000 50,000,000   50,000,000              
Preferred stock, par value   $ 1.00 $ 1.00   $ 1.00              
Treasury Stock Shares Acquired     898 5,393,236 5,984,078 9,258,611            
Treasury Stock Shares   59,787,306 59,787,306 49,276,790 59,787,306 49,276,790   59,797,663 54,360,304   43,906,494 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              
Remaining authorization to repurchase   $ 200,000,000.0 $ 200,000,000.0   200,000,000.0              
Legal Surplus Amount   $ 199,576,000 $ 199,576,000   $ 199,576,000       $ 199,576,000      
Preferred Stock Shares Outstanding   0 0   0       0      
Stock Issued During Period Shares Treasury Stock Reissued     14,947 23,903 564,232 994,332            
Dividends paid on common stock     $ 26,300,000 $ 24,900,000 $ 79,700,000 $ 75,600,000            
Common stock per share paid     $ 0.16 $ 0.14 $ 0.48 $ 0.42            
Trust Preferred Securities [Member] | Statutory Trust Two [Member] | Parent Company [Member]                        
Class Of Stock [Line Items]                        
Trust preferred securities repurchased   $ 48,500,000                    
Repurchased face amount   50,000,000.0 $ 50,000,000.0   $ 50,000,000.0              
Stock Repurchase Program Announced July 24, 2023 [Member]                        
Class Of Stock [Line Items]                        
Treasury Stock Shares Acquired         5,846,872              
Common stock repurchased price per share         $ 17.10              
Remaining authorization to repurchase   $ 50,000,000.0 $ 50,000,000.0   $ 50,000,000.0              
Repurchase program authorize amount                   $ 225,000,000    
Common stock repurchase value         $ 100,000,000.0              
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 $ 0.16                      
Subsequent Event [Member] | O2024 Q4 Dividends [Member]                        
Class Of Stock [Line Items]                        
Dividend Payable Date To Be Paid Day Month And Year Dec. 13, 2024                      
Dividends Payable Date Of Record Day Month And Year Nov. 29, 2024                      
Dividends Payable Date Declared Day Month And Year Oct. 30, 2024