MORTGAGE SERVICING RIGHTS - Balance of loans serviced for others and fair value of mortgage servicing rights (Details) - Balance of loans serviced for others and fair value of mortgage servicing rights - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Residential mortgage loans serviced for others	$ 125,243	$ 130,816
Fair value of mortgage servicing rights	$ 902	$ 1,315