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LOANS AND ALLOWANCE FOR LOAN LOSSES - Schedule of Accretable Yield of Purchased Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accretable Yield Movement Schedule [Roll Forward]        
Accretable yield, beginning of period $ 3,016 $ 4,182 $ 3,438 $ 6,950
Additions 0 0 0 570
Accretion of income (203) (546) (878) (2,459)
Reclassifications from nonaccretable difference due to improvement in expected cash flows 11 139 128 1,260
Other changes, net (12) (231) 124 (2,777)
Accretable yield, end of period $ 2,812 $ 3,544 $ 2,812 $ 3,544