Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY (Narrative) (Details)

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STOCKHOLDERS' EQUITY (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 09, 2020
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]              
Preferred stock, shares authorized   500,000     500,000   500,000
Shares issued and sold     17,250        
Preferred stock, par value (in dollars per share)   $ 10.00     $ 10.00    
Preferred stock, shares outstanding   17,250     17,250   0
Net proceeds from issuance of preferred stock         $ 166,356 $ 0  
Reclassifications of unrealized gains (losses) on AFS   $ 18   $ 7,104 $ 12,293 $ 7,306  
Depositary Shares              
Accumulated Other Comprehensive Income (Loss) [Line Items]              
Shares issued and sold 6,900,000            
Number of shares to be purchased upon the exercise of options 900,000            
Preferred stock, liquidation preference (usd per share) $ 25            
Series A Preferred Stock              
Accumulated Other Comprehensive Income (Loss) [Line Items]              
Number of preferred stock represented by each depositary share The Series A preferred stock is represented by depositary shares, each representing a 1/400th ownership interest in a share of Series A preferred stock            
Preferred stock, liquidation preference (usd per share) $ 10,000            
Preferred stock, par value (in dollars per share) $ 10.00            
Preferred stock, dividend rate         6.875%    
Net proceeds from issuance of preferred stock $ 166,400