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STOCKHOLDERS' EQUITY - Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Aug. 23, 2019
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Series D Preferred Stock          
Class of Stock [Line Items]          
Depository shares to preferred stock ratio 2.50%        
Series E Preferred Stock          
Class of Stock [Line Items]          
Depository shares to preferred stock ratio 2.50%        
Preferred Stock          
Class of Stock [Line Items]          
Preferred stock, authorized (in shares)     50,000,000    
Preferred stock, par value (in dollars per share)     $ 0.01    
Preferred stock, liquidation preference per share (in dollars per share)     $ 1,000    
Impact of preferred stock redemption     $ 3,347 $ (568) $ 5,093
Preferred Stock | Series D Preferred Stock          
Class of Stock [Line Items]          
Impact of preferred stock redemption   $ 3,300 $ 3,347 $ (541) $ 1,681
Outstanding shares redeemed (shares)     93,269 3,360 18,371
Non cumulative preferred stock, dividend rate (percent)     7.375% 7.375%  
Preferred Stock | Series D Depository shares          
Class of Stock [Line Items]          
Outstanding shares redeemed (shares)     3,730,767 134,410 734,823
Preferred Stock | Series E Depository shares          
Class of Stock [Line Items]          
Outstanding shares redeemed (shares)     0 70,967 980,928
Preferred Stock | Series E Preferred Stock          
Class of Stock [Line Items]          
Impact of preferred stock redemption     $ 0 $ (27) $ 3,412
Outstanding shares redeemed (shares)     0 1,774 24,523
Non cumulative preferred stock, dividend rate (percent)     7.00% 7.00%