COVERED LOANS - Additional Information (Detail) (Covered Loans, USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Loans Accounted for Under FASB ASC Topic 310-30	Dec. 31, 2011 Loans Accounted for Under FASB ASC Topic 310-30
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance including contractual principal, interest, fees, and penalties					$ 1,200,000,000	$ 1,600,000,000
Reclassification from non-accretable difference	$ 2,338,000	$ 17,311,000	$ 25,780,000	$ 50,517,000