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FAIR VALUES - Unobservable Input Reconciliation (Details) - Derivative liabilities - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balance of recurring Level 3 assets at January 1 $ (365) $ (140)
Derivative instruments entered into (52) (43)
Included in earnings - other non-interest income 60 (182)
Balance of recurring Level 3 assets at December 31 $ (357) $ (365)