SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Common Share
Net income available to common stockholders	$ (73)	$ 35	$ 152	$ 80	$ 480	$ 425	$ 363	$ 250	$ 194	$ 1,518
Basic common shares:
Weighted average shares outstanding									1,792,853	1,787,909
Less: Weighted average unallocated ESOP shares									(76,296)	(83,535)
Add: Weighted average unvested restricted stock shares with non-forfeitable dividend rights									46,221	43,719
Basic weighted average common shares outstanding									1,762,778	1,748,093
Dilutive potential common shares									16,894	8,726
Diluted weighted average common shares outstanding									1,779,672	1,756,819
Basic earnings per share (in dollars per share)	$ (0.04)	$ 0.02	$ 0.09	$ 0.05	$ 0.27	$ 0.24	$ 0.21	$ 0.14	$ 0.11	$ 0.87
Diluted earnings per share (in dollars per share)	$ (0.04)	$ 0.02	$ 0.09	$ 0.05	$ 0.27	$ 0.24	$ 0.21	$ 0.14	$ 0.11	$ 0.86
Options to purchase shares included in the computation of diluted earnings per share (in shares)									122,775	89,725
Parent
Earnings Per Common Share
Net income available to common stockholders									$ 194	$ 1,518