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STOCKHOLDERS' EQUITY - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
May 16, 2019
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Class Of Stock [Line Items]          
Common stock, shares authorized   2,000,000,000 2,000,000,000 2,000,000,000  
Common stock, par value   $ 0.1 $ 0.1 $ 0.1  
Common stock, shares issued   222,055,625 221,789,509 222,055,625  
Common stock, shares outstanding   217,328,179 217,235,140 217,328,179  
Common Stock Dividends Per Share Declared $ 0.03 $ 0.03   $ 0.06  
Common Stock, Dividends, Per Share, Cash Paid   $ 0.03      
Preferred Stock Shares Authorized   50,000,000 50,000,000 50,000,000  
Preferred stock, par value   $ 1.00   $ 1.00  
Liquidation value per share   $ 25   $ 25  
Repurchased of common stock       170,827 424,810
Stock repurchase plan treasury stock   4,727,446 4,554,369 4,727,446  
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     $ 20,500,000 $ 0  
Legal surplus reserve amount   $ 80,191,000 $ 80,191,000 80,191,000  
Common Stock [Member]          
Class Of Stock [Line Items]          
Dividends declared   $ 6,500,000   $ 13,100,000  
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%