SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE - Securities Sold Under Agreements to Repurchase (Detail) - USD ($) $ in Thousands		Dec. 31, 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 3.52% (December 31, 2011 - 2.50% to 4.40%)	[1],[2]	$ 300,000	$ 700,000

[1] As of December 31, 2016, includes $200 million that have an average rate of 2.11% and that are callable by lenders before their contractual maturities at various dates beginning on January 19, 2017. Subsequent to December 31, 2016, no lender has exercised its call option on repurchase agreements. In addition, $100 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.