SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Net Warehouse Interest Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Warehouse interest income	$ 11,912	$ 18,413	$ 34,015	$ 44,816
Warehouse interest expense	(13,943)	(14,433)	(37,571)	(30,795)
Net warehouse interest income (expense)	(2,031)	3,980	(3,556)	14,021
Co-broker fees	$ 2,500	$ 3,100	$ 9,300	$ 13,400