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LOANS - Rollforward of Accretable Discounts of Purchased Loans (Details) - Purchased Loans, Accretable Discount - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 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
Accretion (1,571) (3,097)
Accretable discounts removed due to charge-offs 0 (13)
Transfers between non-accretable and accretable discounts, net 146 (659)
Ending balance $ 18,767 $ 26,855