ALLOWANCE FOR RISK-SHARING OBLIGATIONS - Summary of Allowance for Risk-Sharing Obligations (Detail) $ in Thousands	3 Months Ended					6 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Jun. 30, 2023 USD ($) loan	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) loan
Allowance for Risk-Sharing Contracts
Beginning balance	$ 32,410	$ 33,087	$ 44,057	$ 53,244	$ 62,636	$ 44,057	$ 62,636	$ 62,636
Provision (benefit) for risk-sharing obligations		(677)	(10,900)	(4,769)	(9,400)	(11,647)	(14,161)
Ending balance		32,410	$ 33,087	48,475	$ 53,244	$ 32,410	48,475	$ 44,057
Number of defaulted loans | loan						2		2
Amount of specific reserves placed on defaulted at risk loans		3,500				$ 3,500		$ 4,400
Settlement of risk sharing obligation with Fannie Mae	$ 2,000
Weighted average remaining life of the at risk servicing portfolio						6 years 9 months 18 days		7 years 2 months 12 days
Fannie Mae DUS program
Allowance for Risk-Sharing Contracts
Maximum quantifiable contingent liability associated with guarantees		$ 11,300,000		$ 10,500,000		$ 11,300,000	$ 10,500,000