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LOANS - Summary of Activity in the Accretable Yield for PCI Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Activity in the accretable yield for the PCI loans:    
Balance at beginning of period $ 2,151 $ 6,915
Accretion (1,842) (5,221)
Reclassification (to) from nonaccretable difference during the period 151 457
Accretable discount at end of period 460 2,151
Increase in allowance for loan losses   100
Purchased Credit Impaired Loans Charge - off $ 0 $ 100