SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Provision (Benefit) for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Provision (Benefit) for Credit Losses
Provision (benefit) for loan losses	$ 25	$ (255)
Provision (benefit) for risk-sharing obligations	(157)	(154)
Provision (benefit) for credit losses	$ (132)	$ (409)