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LOANS - Accretable yield on PCI loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Receivables [Abstract]    
Accretable yield, beginning of period $ 3,593 $ 3,307
Additions 0 0
Accretion (904) (1,541)
Reclassification from (to) nonaccretable difference 360 576
Other changes, net 142 1,251
Accretable yield, end of period $ 3,191 $ 3,593