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STOCKHOLDERS' EQUITY - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Oct. 22, 2021
Oct. 21, 2021
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Class Of Stock [Line Items]                  
Common stock, shares authorized     2,000,000,000     2,000,000,000 2,000,000,000   2,000,000,000
Common stock, par value     $ 0.10     $ 0.10 $ 0.10   $ 0.1
Common stock, shares issued     223,655,186     223,655,186 223,655,186   223,034,348
Common stock, shares outstanding     206,495,900     206,495,900 206,495,900   218,235,064
Common Stock, Dividends, Per Share, Declared     $ 0.07   $ 0.05   $ 0.21 $ 0.15  
Stock Repurchase Program, Authorized Amount     $ 300,000,000     $ 300,000,000 $ 300,000,000    
Stock Repurchase Program Expiration Date             Jun. 30, 2022    
Stock Repurchase Program, Remaining Authorized Repurchase Amount     $ 150,000,000     $ 150,000,000 $ 150,000,000    
Preferred Stock, Shares Authorized     50,000,000     50,000,000 50,000,000   50,000,000
Preferred stock, par value     $ 1.00     $ 1.00 $ 1.00    
Liquidation value per share     $ 25     $ 25 $ 25    
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation             213,757 51,814  
Stock repurchase plan treasury stock     17,159,286     17,159,286 17,159,286   4,799,284
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 amount     $ 109,338,000     $ 109,338,000 $ 109,338,000   $ 109,338,000
Subsequent Event [Member]                  
Class Of Stock [Line Items]                  
Preferred Stock Redemption Amount   $ 36,100,000              
Preferred Stock Redemption Date   Nov. 30, 2021              
Preferred Stock Redemption Price Per Share   $ 25.00              
Stock Repurchase Program [Member]                  
Class Of Stock [Line Items]                  
Shares of common stock repurchased     4,158,806 7,962,647   12,121,453 12,121,453    
Series A Preferred Stock [Member]                  
Class Of Stock [Line Items]                  
Preferred stock dividend rate percentage             7.125%    
Series B Preferred Stock [Member]                  
Class Of Stock [Line Items]                  
Preferred stock dividend rate percentage             8.35%    
Series C Preferred Stock [Member]                  
Class Of Stock [Line Items]                  
Preferred stock dividend rate percentage             7.40%    
Series D Preferred Stock [Member]                  
Class Of Stock [Line Items]                  
Preferred stock dividend rate percentage             7.25%    
Series E Preferred Stock [Member]                  
Class Of Stock [Line Items]                  
Preferred stock dividend rate percentage             7.00%    
Common Stock [Member]                  
Class Of Stock [Line Items]                  
Dividends Payable, Date of Record             Nov. 26, 2021    
Dividends Payable, Date to be Paid             Dec. 10, 2021    
Dividneds declared     $ 14,600,000   $ 11,000,000.0   $ 44,900,000 $ 32,800,000  
Common Stock [Member] | Subsequent Event [Member]                  
Class Of Stock [Line Items]                  
Common Stock, Dividends, Per Share, Declared $ 0.10                
Increase in cash dividend declared percent 43.00%                
Increase in cash dividend declared per common share $ 0.03                
Preferred Stock [Member]                  
Class Of Stock [Line Items]                  
Dividneds declared     $ 700,000   $ 700,000   $ 2,000,000.0 $ 2,000,000