OTHER REAL ESTATE OWNED - Summary of Activity in Purchased Other Real Estate Owned (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Real Estate Owned
Other	$ 0	$ (62)
Purchased Other Real Estate Owned
Real Estate Owned
January 1	9,535	9,011
Loans transferred to other real estate owned	3,908	2,434
Acquired in acquisitions	7,178	1,888
Portion of gains (losses) on sale and write-downs payable to (receivable from) the FDIC under loss-sharing agreements	(24)	0
Net gains (losses) on sale and write-downs recorded in statement of income	276	(477)
Sales proceeds	(5,086)	(5,140)
Other	(2)	(24)
Ending balance	$ 15,785	$ 7,692