SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Provision for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Components of Provision for Credit Losses
Provision (benefit) for loan losses	$ (178)	$ 25	$ 928	$ 648
Provision for risk-sharing obligations	5,081	936	27,618	2,988
Provision for credit losses	$ 4,903	$ 961	$ 28,546	$ 3,636