STOCK-BASED COMPENSATION PLANS - Employee Stock Ownership Plan (Details) - ESOP $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) h / yr	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Employee Stock Ownership Plan
Minimum hours of work per year for employees to be covered under Employee Stock Ownership Plan (ESOP) | h / yr	1,000
Annual contribution by employer as a percentage of pretax income before the contribution	5.00%	5.00%	5.00%
Company contributions | $	$ 1,090	$ 849	$ 674