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STOCKHOLDERS' EQUITY - Perpetual Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Apr. 08, 2015
Jun. 30, 2015
Jun. 30, 2014
Class of Stock [Line Items]      
Net proceeds from issuance of preferred stock   $ 110,873 $ 0
Underwriters option period 30 days    
Series D Preferred Stock      
Class of Stock [Line Items]      
Stock Issued During the Period, Depositary Shares 4,000,000    
Non cumulative preferred stock, dividend rate 7.375% 7.375%  
Preferred stock, liquidation preference per share $ 1,000 $ 1,000  
Price per share of depository shares (in usd per share) $ 25    
Depository shares to preferred stock ratio 2.50%    
Net proceeds from issuance of preferred stock $ 96,900    
Preferred Stock, Capital Shares Reserved for Future Issuance 600,000    
Series D Preferred Stock | Over Allotment Option      
Class of Stock [Line Items]      
Net proceeds from issuance of preferred stock $ 14,500    
Underwriters option period 30 days