SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE - Securities Sold Under Agreements to Repurchase (Detail) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Securities Sold Under Agreements To Repurchase And Other Short Term Borrowings [Line Items]
Repurchase agreements, interest ranging from 2.45% to 3.35%(December 31, 2012- 2.45% to 3.39%)	[1],[2]	$ 600,000	$ 700,000

[1] As of September 30, 2016, includes $500 million with an average rate of 3.56% that lenders have the right to call before their contractual maturities at various dates beginning on October 11, 2016. In addition, $400 million is tied to variable rates.

[2] Reported net of securities purchased under agreements to repurchase (reverse repurchase agreements) by counterparty, when applicable, pursuant to ASC 210-20-45-11.