SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE - Securities Sold Under Agreements to Repurchase (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Securities Sold Under Agreements To Repurchase And Other Short Term Borrowings [Line Items]
Securities sold under agreements to repurchase	$ 900,000	[1]	$ 900,000
Maximum [Member]
Securities Sold Under Agreements To Repurchase And Other Short Term Borrowings [Line Items]
Assets sold under agreements to repurchase interest rate	4.50%		3.32%
Minimum [Member]
Securities Sold Under Agreements To Repurchase And Other Short Term Borrowings [Line Items]
Assets sold under agreements to repurchase interest rate	2.45%		2.45%
Weighted Average [Member] | Callable Repurchase Agreements [Member]
Securities Sold Under Agreements To Repurchase And Other Short Term Borrowings [Line Items]
Assets sold under agreements to repurchase interest rate	3.07%

[1] As of September 30, 2014, includes $800 million with an average rate of 3.07% that lenders have the right to call before their contractual maturities at various dates beginning on October 9, 2014. Subsequent to September 30, 2014, no lender has exercised its call option on repurchase agreements. In addition, $600 million of the $900 million is tied to variable rates.