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STOCKHOLDERS' EQUITY - Perpetual Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Apr. 08, 2015
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 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]        
Issuance of depositary shares 4,000,000      
Depository shares to preferred stock ratio 2.50%      
Non cumulative preferred stock, dividend rate 7.375% 7.375%   7.375%
Preferred stock, liquidation preference per share $ 1,000 $ 1,000   $ 1,000
Price per share of depository shares (in usd per share) $ 25      
Net proceeds from issuance of preferred stock $ 96,900      
Additional depositary shares to cover over-allotments 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