SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Provision for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Components of Provision for Credit Losses
Provision (benefit) for loan losses	$ (106)	$ (587)
Provision (benefit) for risk-sharing obligations	(9,392)	(10,733)
Provision (benefit) for credit losses	$ (9,498)	$ (11,320)