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MARKETABLE SECURITIES - Narrative (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Position
security
Jun. 30, 2020
security
Jun. 30, 2021
USD ($)
security
Position
Jun. 30, 2020
security
Dec. 31, 2020
USD ($)
Investments Debt And Equity Securities [Abstract]          
Allowance for credit losses for available for sale debt securities | $ $ 0   $ 0   $ 0
Number of investment in an unrealized loss position | Position 25   25    
Percentage of unrealized loss exceeds book value     20.00%    
Number of securities other than agencies amount | security     0    
Fair value of securities pledged as collateral | $ $ 299,031,000   $ 299,031,000   $ 314,962,000
Number of securities sold | security 0 0 0 0