MORTGAGE SERVICING RIGHTS - Changes in mortgage servicing rights (Details) - Changes in mortgage servicing rights - USD ($) $ in Thousands		3 Months Ended				9 Months Ended
		Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016
Mortgage Servicing Rights
Balance, beginning of period		$ 241		$ 416		$ 339		$ 487
Originated		15		28		53		71
Amortization		(13)	[1]	(67)	[1]	(149)	[1]	(181)
Balance, end of period		243		377		243		377
Valuation Allowance
Balance, beginning of period		(25)		(25)		(23)		(3)
Decrease (increase) in impairment reserve	[1]	26		7		24		(17)
Balance, end of period		1		(18)		1		(20)
Mortgage servicing rights, net		$ 244		$ 359		$ 244		$ 357

[1] (1) Amortization expense and changes in the impairment reserve are recorded in mortgage servicing, net.