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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, 2019
Sep. 30, 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
Additions due to acquisitions 38,116 29,318
Accretion (10,503) (8,083)
Accretable discounts removed due to charge-offs 0 (16)
Transfers between non-accretable and accretable discounts, net (2,052) 1,569
Ending balance $ 66,057 $ 42,980