ADVANCES FROM THE FEDERAL HOME LOAN BANK (FHLB) - Summary of Advances from FHLB (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Short-term Debt [Line Items]
Fixed-rate advances from FHLB, with a weighted-average interest rate of 2.31% (December 31, 2011 - 3.59%)	$ 518,440
Federal Home Loan Bank [Member]
Short-term Debt [Line Items]
Fixed-rate advances from FHLB, with a weighted-average interest rate of 2.31% (December 31, 2011 - 3.59%)	$ 518,440	$ 367,440