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STOCKHOLDERS' EQUITY - Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Sep. 17, 2018
Feb. 08, 2016
Apr. 08, 2015
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Apr. 01, 2016
Class of Stock [Line Items]                      
Preferred stock, authorized (in shares)       50,000,000       50,000,000      
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      
Deferred stock issue costs reclassified       $ 0 $ 2,307 $ 0 $ 0 $ 2,307 $ 0 $ 0  
Gross proceeds from issuance of preferred stock               $ 0 $ 0 $ 120,255  
Underwritten Public Offering                      
Class of Stock [Line Items]                      
Offering price per share (in dollars per share)   $ 25                  
Depository shares issued   5,000,000                  
Series C Depository shares                      
Class of Stock [Line Items]                      
Outstanding shares redeemed (shares) 1,610,000                    
Preferred stock, liquidation preference per share (in dollars per share) $ 25.00                    
Series D 7.375% non-cumulative perpetual                      
Class of Stock [Line Items]                      
Preferred stock, liquidation preference per share (in dollars per share)     $ 1,000                
Depository shares issued     4,000,000                
Depository shares to preferred stock ratio     2.50%                
Non cumulative preferred stock, dividend rate     7.375%                
Offering price per share (in dollars per share)     $ 25.00                
Gross proceeds from issuance of preferred stock     $ 96,900                
Preferred stock, shares issued     115,000                
Series D 7.375% non-cumulative perpetual | Over Allotment Option                      
Class of Stock [Line Items]                      
Gross proceeds from issuance of preferred stock     $ 14,500                
Underwriters option period     30 days                
Preferred shares available for issuance     600,000                
Series D 7.375% non-cumulative perpetual | Underwritten Public Offering                      
Class of Stock [Line Items]                      
Depository shares to preferred stock ratio     2.50%                
Series E 7.00% non-cumulative perpetual                      
Class of Stock [Line Items]                      
Preferred stock, liquidation preference per share (in dollars per share)   $ 1,000                  
Depository shares to preferred stock ratio   2.50%                  
Non cumulative preferred stock, dividend rate   7.00%                  
Offering price per share (in dollars per share)   $ 25.00                  
Preferred stock, shares issued   125,000                  
Series E 7.00% non-cumulative perpetual | Underwritten Public Offering                      
Class of Stock [Line Items]                      
Preferred stock, liquidation preference per share (in dollars per share)   $ 1,000                  
Depository shares to preferred stock ratio   2.50%                  
Gross proceeds from issuance of preferred stock   $ 121,100                  
Depository shares issued   5,000,000                  
Series A Non-cumulative perpetual                      
Class of Stock [Line Items]                      
Preferred stock, liquidation preference per share (in dollars per share)                     $ 1,000
Preferred stock, shares redeemed (in shares)                     32,000
Series B Non-cumulative perpetual                      
Class of Stock [Line Items]                      
Preferred stock, shares redeemed (in shares)                     10,000
Preferred Stock                      
Class of Stock [Line Items]                      
Preferred stock, authorized (in shares)       240,000       240,000 280,250    
Preferred Stock | Series C 8.00% non-cumulative perpetual                      
Class of Stock [Line Items]                      
Outstanding shares redeemed (shares) 40,250                    
Preferred stock, authorized (in shares)       0       0 40,250    
Preferred stock, liquidation preference per share (in dollars per share) $ 1,000                    
Preferred stock redemption amount $ 40,300                    
Non cumulative preferred stock, dividend rate 8.00%             8.00% 8.00%    
Preferred Stock | Series D 7.375% non-cumulative perpetual                      
Class of Stock [Line Items]                      
Preferred stock, authorized (in shares)       115,000       115,000 115,000    
Non cumulative preferred stock, dividend rate               7.375% 7.375%    
Preferred Stock | Series E 7.00% non-cumulative perpetual                      
Class of Stock [Line Items]                      
Preferred stock, authorized (in shares)       125,000       125,000 125,000    
Non cumulative preferred stock, dividend rate               7.00% 7.00%