SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE - Securities Sold Under Agreements to Repurchase (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
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%)	$ 900,000	[1]	$ 900,000	[1]

[1] As of December 31, 2014, includes $800 million with an average rate of 3.30%, and that lenders have the right to call before their contractual maturitiesat various dates beginning on January 9, 2015. Subsequent to December 31, 2014, no lender has exercised its call option on repurchase agreements.In addition, $500 million of the $900 million is tied to variable rates.