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STOCKHOLDERS' EQUITY - Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Aug. 23, 2019
Sep. 17, 2018
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Class of Stock [Line Items]            
Aggregate amount of redemption       $ 4,379 $ 46,396 $ 40,250
Series D Preferred Stock            
Class of Stock [Line Items]            
Depository shares to preferred stock ratio 2.50%          
Series E Preferred Stock            
Class of Stock [Line Items]            
Depository shares to preferred stock ratio 2.50%          
Preferred Stock            
Class of Stock [Line Items]            
Preferred stock, authorized (in shares)     50,000,000 50,000,000 197,106  
Preferred stock, par value (in dollars per share)     $ 0.01 $ 0.01    
Preferred stock, liquidation preference per share (in dollars per share)     $ 1,000 $ 1,000    
Aggregate amount of redemption   $ 40,300   $ 4,947 $ 41,303 $ 37,943
Preferred Stock | Series D Depository shares            
Class of Stock [Line Items]            
Outstanding shares redeemed (shares) 734,823     134,410    
Aggregate amount of redemption     $ 2,700      
Preferred Stock | Series D Preferred Stock            
Class of Stock [Line Items]            
Preferred stock, authorized (in shares)         96,629  
Preferred stock, liquidation preference per share (in dollars per share)     $ 1,000 $ 1,000    
Outstanding shares redeemed (shares) 18,371     3,360    
Aggregate amount of redemption $ 19,400          
Stock issuance cost $ 1,700     $ 541    
Non cumulative preferred stock, dividend rate (percent)       7.375% 7.375%  
Preferred Stock | Series E Depository shares            
Class of Stock [Line Items]            
Outstanding shares redeemed (shares) 980,928     70,967    
Aggregate amount of redemption       $ 1,700    
Preferred Stock | Series E Preferred Stock            
Class of Stock [Line Items]            
Preferred stock, authorized (in shares)         100,477  
Preferred stock, liquidation preference per share (in dollars per share)     $ 1,000 $ 1,000    
Outstanding shares redeemed (shares) 24,523     1,774    
Aggregate amount of redemption $ 26,600          
Stock issuance cost $ 3,400     $ 27    
Non cumulative preferred stock, dividend rate (percent)       7.00% 7.00%  
Preferred Stock | Series C Depository shares            
Class of Stock [Line Items]            
Outstanding shares redeemed (shares)   1,610,000        
Redemption price ( in dollars per share)   $ 25        
Stock issuance cost   $ 2,300        
Preferred Stock | Series C 8.00% non-cumulative perpetual            
Class of Stock [Line Items]            
Outstanding shares redeemed (shares)   40,250        
Redemption price ( in dollars per share)   $ 1,000        
Non cumulative preferred stock, dividend rate (percent)   8.00%