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LOANS - Rollforward of Accretable Discounts of Purchased Loans (Details) - Purchased Loans, Accretable Discount - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Balance, January 1 $ 20,192 $ 30,624
Additions due to acquisitions 29,318 0
Accretion (8,083) (9,023)
Accretable discounts removed due to charge-offs (16) (15)
Transfers between non-accretable and accretable discounts, net 1,569 923
Ending balance $ 42,980 $ 22,509