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MARKETABLE SECURITIES - Narrative (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Position
Security
Sep. 30, 2020
Security
Sep. 30, 2021
USD ($)
Security
Position
Sep. 30, 2020
Security
Dec. 31, 2020
USD ($)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]          
Allowance for credit losses for available for sale debt securities $ 0   $ 0   $ 0
Number of investment in an unrealized loss position | Position 26   26    
Number of investment in an sale debt securities | Position 22   22    
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 $ 279,726,000   $ 279,726,000   $ 314,962,000
Number of securities sold | Security 0 0 0 0  
Unamortized, unrealized gain remaining on transferred securities     $ 9,684,000