OTHER REAL ESTATE OWNED - Summary of Activity in Other Real Estate Owned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Other Real Estate [Roll Forward]
Balance, January 1	$ 10,874	$ 16,147
Loans transferred to other real estate owned	4,372	3,203
Net gains (losses) on sale and write-downs recorded in statement of income	(862)	(1,338)
Sales proceeds	(5,920)	(7,138)
Ending balance	$ 8,464	$ 10,874