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STOCKHOLDERS' EQUITY - Summary of Preferred Stock (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Feb. 08, 2016
Apr. 08, 2015
Jun. 30, 2016
Dec. 31, 2015
Class of Stock [Line Items]        
Preferred stock, authorized (in shares)     50,000,000  
Carrying Value     $ 269,071 $ 190,750
Series D 7.375% non-cumulative perpetual        
Class of Stock [Line Items]        
Non cumulative preferred stock, dividend rate   7.375%    
Series E 7.00% non-cumulative perpetual        
Class of Stock [Line Items]        
Non cumulative preferred stock, dividend rate 7.00%      
Preferred Stock        
Class of Stock [Line Items]        
Preferred stock, authorized (in shares)     280,250 322,250
Preferred stock, shares outstanding (in shares)     280,250 322,250
Liquidation Preference     $ 280,250 $ 322,250
Carrying Value     $ 269,071 $ 311,008
Preferred Stock | Series A Non-cumulative perpetual        
Class of Stock [Line Items]        
Preferred stock, authorized (in shares)     0 32,000
Preferred stock, shares outstanding (in shares)     0 32,000
Liquidation Preference     $ 0 $ 32,000
Carrying Value     $ 0 $ 31,934
Preferred Stock | Series B Non-cumulative perpetual        
Class of Stock [Line Items]        
Preferred stock, authorized (in shares)     0 10,000
Preferred stock, shares outstanding (in shares)     0 10,000
Liquidation Preference     $ 0 $ 10,000
Carrying Value     $ 0 $ 10,000
Preferred Stock | Series C 8.00% non-cumulative perpetual        
Class of Stock [Line Items]        
Preferred stock, authorized (in shares)     40,250 40,250
Preferred stock, shares outstanding (in shares)     40,250 40,250
Non cumulative preferred stock, dividend rate     8.00% 8.00%
Liquidation Preference     $ 40,250 $ 40,250
Carrying Value     $ 37,943 $ 37,943
Preferred Stock | Series D 7.375% non-cumulative perpetual        
Class of Stock [Line Items]        
Preferred stock, authorized (in shares)     115,000 115,000
Preferred stock, shares outstanding (in shares)     115,000 115,000
Non cumulative preferred stock, dividend rate     7.375% 7.375%
Liquidation Preference     $ 115,000 $ 115,000
Carrying Value     $ 110,873 $ 110,873
Preferred Stock | Series E 7.00% non-cumulative perpetual        
Class of Stock [Line Items]        
Preferred stock, authorized (in shares)     125,000 125,000
Preferred stock, shares outstanding (in shares)     125,000 125,000
Non cumulative preferred stock, dividend rate     7.00% 7.00%
Liquidation Preference     $ 125,000 $ 125,000
Carrying Value     $ 120,255 $ 120,258