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LOANS AND ALLOWANCE FOR LOAN LOSSES - Rollforward of Accretable Discounts of Purchased Loans (Details) - Purchased Loans, Accretable Discount - 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, January 1 $ 20,192 $ 30,624
Additions due to acquisitions 30,037 0
Accretion (11,918) (11,308)
Accretable discounts removed due to charge-offs (42) (17)
Transfers between non-accretable and accretable discounts, net 2,227 893
Ending balance $ 40,496 $ 20,192