SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Provision for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Components of Provision for Credit Losses
Provision (benefit) for loan losses	$ 2,179	$ 58	$ 3,107	$ 706
Provision (benefit) for risk-sharing obligations	1,304	(830)	28,922	2,158
Provision (benefit) for credit losses	$ 3,483	$ (772)	$ 32,029	$ 2,864