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LOANS AND THE ALLOWANCE FOR LOAN LOSSES - Accretable Yield For Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Changes in accretable yield for loans acquired with deteriorated credit quality      
Beginning balance $ 1,662 $ 2,101 $ 2,723
Reclassification from non-accretable difference 288 822 2,092
Accretion income (553) (1,261) (2,714)
Ending balance $ 1,397 $ 1,662 $ 2,101