ALLOWANCE FOR LOAN AND LEASE LOSSES - Allowance for Loan and Lease Losses on Covered Loans for the Previous Five Quarters (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended					6 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
FDIC Indemnification Income	$ 8,280				$ 21,643	$ 21,096	$ 45,078
Balance at beginning of period	46,156	42,835	48,112	51,044	31,555	42,835	16,493
Provision for loan and lease losses	6,047	12,951	6,910	7,260	23,895	18,998	49,911
Loans charged-off	(5,163)	(10,118)	(13,513)	(10,609)	(7,456)	(15,281)	(21,482)
Recoveries	1,287	488	1,326	417	3,050	1,775	6,122
Balance at end of period	$ 48,327	$ 46,156	$ 42,835	$ 48,112	$ 51,044	$ 48,327	$ 51,044