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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, 2019
Mar. 31, 2018
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Balance, January 1 $ 40,496 $ 20,192
Accretion (2,980) (1,571)
Transfers between non-accretable and accretable discounts, net (1,869) 146
Ending balance $ 35,647 $ 18,767