ALLOWANCE FOR RISK-SHARING OBLIGATIONS AND GUARANTY OBLIGATION - Schedule of Activity Related to Guaranty Obligation (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
ALLOWANCE FOR RISK-SHARING OBLIGATIONS AND GUARANTY OBLIGATION
Guaranty obligation, net of accumulated amortization - beginning balance	$ 45,649	$ 50,369	$ 47,378	$ 52,306
Additions, following the sale of loan	1,401	1,449	4,711	4,023
Amortization	(2,588)	(2,758)	(7,627)	(7,269)
Guaranty obligation, net of accumulated amortization - ending balance	$ 44,462	$ 49,060	$ 44,462	$ 49,060