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STOCKHOLDERS' EQUITY - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Feb. 14, 2019
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Class Of Stock [Line Items]        
Common stock, shares authorized   2,000,000,000 2,000,000,000  
Common stock, par value   $ 0.1 $ 0.1  
Common stock, shares issued   222,055,125 221,789,509  
Common stock, shares outstanding   217,331,577 217,235,140  
Common Stock Dividends Per Share Declared $ 0.03      
Common Stock, Dividends, Per Share, Cash Paid   $ 0.03    
Corporation has authorized shares of preferred stock   50,000,000 50,000,000  
Preferred stock, par value   $ 1 $ 1  
Liquidation value per share   $ 25    
Repurchased of common stock   168,679   383,087
Stock repurchase plan treasury stock   4,723,548 4,554,369  
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 there is no legal surplus reserve 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 $ 20,500  
Legal surplus reserve amount   $ 80,191 $ 80,191  
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, Cash   $ 6,500