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STOCKHOLDERS' EQUITY - Preferred Stock (Details) - USD ($)
 6 Months Ended 12 Months Ended
Sep. 17, 2018
Jun. 30, 2019
Dec. 31, 2018
Jul. 25, 2019
Preferred Stock        
Class of Stock [Line Items]        
Payment for redemption of shares $ 40,300,000      
Preferred Stock | Series C 8.00% non-cumulative perpetual        
Class of Stock [Line Items]        
Shares redeemed (in shares) 40,250      
Non cumulative preferred stock, dividend rate 8.00% 8.00% 8.00%  
Liquidation amount (in usd per share) $ 1,000      
Preferred Stock | Series C Depository Shares        
Class of Stock [Line Items]        
Shares redeemed (in shares) 1,610,000      
Interest in Series C Preferred Stock represented by each redeemed share (percent) 2.50%      
Liquidation amount (in usd per share) $ 25      
Deferred issuance costs reclassified to retained earnings $ 2,300,000      
Subsequent Event | Series D and Series E Preferred Stock        
Class of Stock [Line Items]        
Aggregate purchase price of tender offer       $ 75,000,000