SERVICING RIGHTS - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Transfers and Servicing [Abstract]
Income (loss) earned on mortgage servicing rights	$ 2,096	$ (2,254)	$ (6,539)	$ (689)
Loss on fair values of servicing rights	4,200	5,500	22,900	8,600
Revenue earned on mortgage servicing rights	6,300	$ 3,300	16,400	$ 7,900
Unpaid principal balance	7,270,000		7,270,000		$ 4,770,000
Escrow balances	$ 60,100		$ 60,100		$ 21,100
Discount rate			7.50%
Prepayment speed calculation percentage			7.50%