Annual report pursuant to Section 13 and 15(d)

STOCKHOLDERS' EQUITY (Narrative) (Details)

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STOCKHOLDERS' EQUITY (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jun. 09, 2020
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Preferred stock, shares authorized       500,000 500,000  
Shares issued and sold       17,250    
Preferred stock, shares outstanding       17,250 0  
Net proceeds from issuance of preferred stock       $ 166,356,000 $ 0 $ 0
Accounting Standards Update 2017-12            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Reclassifications of unrealized gains (losses) on AFS   $ 400,000        
Accounting Standards Update 2018-02            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Amounts reclassified from AOCI into earnings   $ (107,000)        
Accounting Standards Update 2016-01            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Amounts reclassified from AOCI into earnings     $ (61,000)      
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          
Net proceeds from issuance of preferred stock $ 166,400,000