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COMMITMENTS AND CONTINGENCIES - Off-balance Sheet Liabilities - Reserve (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member]    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount $ 415 $ 415