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LOANS - Accretable Yield Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Balance at beginning of period $ 3,509 $ 0
Acquisitions 0 3,398
Reclassification from nonaccretable difference for loans with improved cash flows 2,240 1,925
Changes in expected cash flows that do not affect the nonaccretable difference 0 0
Reclassification to TDR (30) 0
Accretion (1,342) (1,814)
Balance at end of period $ 4,377 $ 3,509