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OFF-BALANCE-SHEET ARRANGEMENTS, COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Securities      
Unsettled trades to purchase securities $ 17,538,000 $ 6,378,000 $ 0
Unsettled trades to sell securities 0 0  
Deposits [Abstract]      
Unsettled issuances of brokered certificates of deposit $ 20,000,000 $ 15,236,000 $ 0