BORROWINGS - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Debt Disclosure [Line Items]
Federal Home Loan Bank, Advances, Short-term	$ 283,000	$ 0
Repurchase agreements with a one-time call feature at the time of execution	65,000	65,000
Weighted average rate on repurchase agreements	3.50%	3.50%
FHLB long-term advances	9,747	11,544
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	0.00%	0.00%
Other Long-term Debt	$ 774	$ 0
Term of long-term debt	15 years
Maximum
Debt Disclosure [Line Items]
Remaining maturities on repurchase agreements (in years)	3