STOCK BASED COMPENSATION - Restricted Stock Awards (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Stock-based compensation
Closing price of common stock (in dollars per share)	$ 19.89			$ 19.89		$ 21.89	$ 19.89	$ 16.53
Additional disclosures
Compensation expense			$ 382	$ 315	$ 359
Restricted stock
Stock-based compensation
Shares of common stock granted			50,152
Shares
Nonvested at the beginning of the period (in shares)	101,631		101,631
Granted (in shares)			50,152
Vested (in shares)			(43,244)
Forfeited (in shares)			(4,220)
Nonvested at the end of the period (in shares)			104,319	101,631
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 16.57		$ 16.57
Granted (in dollars per share)			22.48
Vested (in dollars per share)			14.75
Forfeited (in dollars per share)			20.00
Nonvested at the end of the period (in dollars per share)			$ 20.03	$ 16.57
Restricted stock | 2007 Stock Incentive Plan
Additional disclosures
Unrecognized compensation costs			$ 1,101
Compensation expense			$ 670	$ 584	$ 487
Weighted-average period of expected recognition of the cost			2 years 3 months 26 days
Restricted stock | Executive officer and other employees
Stock-based compensation
Vesting percentage of stock awards on third anniversary of grant date			100.00%
Shares of common stock granted			50,152	28,955	33,836
Shares
Granted (in shares)			50,152	28,955	33,836
Performance units | Executive officers
Stock-based compensation
Shares of common stock granted	16,152	16,205
Shares
Granted (in shares)	16,152	16,205
Additional disclosures
Compensation expense			$ 240	$ 79