INCOME TAXES - Summary of Changes in Deferred Tax Asset Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets, Valuation Allowance [Roll Forward]
Valuation allowance, beginning balance	$ 12,404	$ 10,054
Increase related to net operating losses and loan loss reserves	18,769	4,720
Decrease related to changes in tax rates	0	(3,845)
Other increase (decrease)	(31,173)	1,475
Valuation allowance, ending balance	$ 0	$ 12,404