STOCK BASED COMPENSATION - Other Expense (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended					12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Additional disclosures
Recognition period of other expense						3 months
Shares awarded	8,204	358	17,976	1,341	14,084
Price Per Share	$ 34.15	$ 19.89	$ 21.89	$ 19.89	$ 19.89		$ 19.89	$ 19.89
Compensation expense						$ 311	$ 382	$ 315
Stock repurchase program
Number of common stock shares repurchased								169,110
Value of common stock shares repurchased								$ 3,381
Common Stock
Stock repurchase program
Percentage of common stock shares authorized to repurchase									5.00%
Number of common stock shares authorized to repurchase									1,085,000