SECURITIES AVAILABLE FOR SALE - Expected maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Amortized Cost
Due in one year or less	$ 810
Due after one year but less than five years	2,324
Due after five years but less than ten years	4,241
Due in more than ten years	6,307
Mortgage-backed GSE residential	2,015
Total	15,697	$ 19,038
Estimated Fair Value
Due in one year or less	810
Due after one year but less than five years	2,324
Due after five years but less than ten years	4,274
Due in more than ten years	6,307
Mortgage-backed GSE residential	1,980
Total	$ 15,695	$ 18,888