RESERVE FOR LOSS ON REPURCHASED LOANS - Summary of Activities in Reserve for Loss Reimbursements on Sold Loans (Detail) - Representations and Warranties Obligations and Corporate Guarantees - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Loss Contingency Accrual [Roll Forward]
Balance at beginning of period	$ 6,306	$ 7,974
Initial provision for loan repurchases	2	842
Subsequent change in the provision	(1,788)	(325)
Utilization of reserve for loan repurchases	(1,094)	(373)
Balance at end of period	$ 3,426	$ 8,118

RESERVE FOR LOSS ON REPURCHASED LOANS - Summary of Activities in Reserve for Loss Reimbursements on Sold Loans (Detail) - Representations and Warranties Obligations and Corporate Guarantees - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2018

Mar. 31, 2017

Loss Contingency Accrual [Roll Forward]

Balance at beginning of period

$ 6,306

$ 7,974

Initial provision for loan repurchases

842

Subsequent change in the provision

(1,788)

(325)

Utilization of reserve for loan repurchases

(1,094)

(373)

Balance at end of period

$ 3,426

$ 8,118