NON-CONSOLIDATED VARIABLE INTEREST ENTITIES AND SERVICING ASSETS - Changes in Impairment Allowance (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Transfers and Servicing [Abstract]
Balance at beginning of period	$ 73	$ 30	$ 1,451
Temporary impairment charges	301	78	123
OTTI of servicing assets	(77)	0	(132)
Recoveries	(95)	(35)	(1,412)
Balance at end of period	$ 202	$ 73	$ 30