DEPOSITS - Scheduled maturities of time certificates of deposit (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Banking and Thrift [Abstract]
CD maturities	$ 2,899	$ 5,120	$ 6,456	$ 21,883	$ 57,530
Total after all years						$ 93,888