STOCK-BASED COMPENSATION PLANS - Tables (Details) - Restricted share awards - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Number of Shares Restricted Stock
Balance at beginning of period (in shares)	10,844	8,002	7,334
Granted (in shares)	9,585	10,176	8,000
Vested (in shares)	(10,844)	(7,334)	(7,332)
Balance at end of period (in shares)	9,585	10,844	8,002
Weighted Average Grant Date Fair Value Per Share
Balance at beginning of period	$ 18.75	$ 18.27	$ 21.32
Granted	15.65	18.87	17.81
Vested	18.75	18.10	17.82
Balance at end of period	$ 15.65	$ 18.75	$ 18.27