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LOANS - PCI Loans - Accretable Yield - Roll Forward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Balance at beginning of period $ 554 $ 256
Additions 291 492
Removals (51) 632
Transfers from nonaccretable yield   94
Accretion (411) (920)
Balance at end of period $ 383 $ 554