SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE - Securities Sold Under Agreements to Repurchase (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
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%)	$ 900,000	[1]	$ 900,000	[1]

[1] As of March 31, 2015, includes $800 million with an average rate of 2.71% that lenders have the right to call before their contractual maturities at various dates beginning on April 9, 2015. Subsequent to April 9, 2015, no lender has exercised its call option on repurchase agreements. In addition, $700 million is tied to variable rates.