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LOANS - Accretable Yield Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]        
Balance at beginning of period $ 2,807 $ 4,567 $ 3,509 $ 0
Acquisitions     0 3,398
Reclassification from nonaccretable difference for loans with improved cash flows 1,985 513 2,031 2,257
Accretion (315) (423) (1,063) (998)
Balance at end of period $ 4,477 $ 4,657 $ 4,477 $ 4,657