NON-CONSOLIDATED VARIABLE INTEREST ENTITIES AND SERVICING ASSETS - Changes in Servicing Assets (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Servicing Assets At Amortized Value [Line Items]
Balance at beginning of period		$ 26,502	$ 25,044	$ 26,244	$ 24,282
Capitalization of servicing assets		833	1,420	2,757	3,878
Amortization		(775)	(817)	(2,342)	(2,424)
Adjustment To Servicing Assets For Loans Repurchased	[1]	129	91	387	126
Adjustment to fair value		(690)	(263)	(1,047)	(387)
Balance at end of period		$ 25,999	$ 25,475	$ 25,999	$ 25,475

[1] Amount represents the adjustment to fair value related to the repurchase of loans serviced for others.