GUARANTY OBLIGATION AND ALLOWANCE FOR RISK-SHARING OBLIGATIONS - Schedule of Activity Related to Guaranty Obligation (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
GUARANTY OBLIGATION AND ALLOWANCE FOR RISK-SHARING OBLIGATIONS
Guaranty obligation, net of accumulated amortization - beginning balance	$ 46,490	$ 51,836	$ 47,378	$ 52,306
Additions, following the sale of loan	1,759	853	3,310	2,574
Amortization	(2,600)	(2,320)	(5,039)	(4,511)
Guaranty obligation, net of accumulated amortization - ending balance	$ 45,649	$ 50,369	$ 45,649	$ 50,369