SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Provision (Benefit) for Credit Losses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Provision (Benefit) for Credit Losses
Provision (benefit) for loan losses	$ (467)	$ (36)	$ 423
Provision (benefit) for risk-sharing obligations	(145)	1,680	1,783
Provision (benefit) for credit losses	$ (612)	$ 1,644	$ 2,206