ALLOWANCE FOR LOAN AND LEASE LOSSES - Additional Information (Detail) (USD $)	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	Mar. 31, 2011	Dec. 31, 2010
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for loan and lease losses	$ 6,047,000	$ 12,951,000	$ 6,910,000	$ 7,260,000	$ 23,895,000	$ 18,998,000	$ 49,911,000
Net charge-offs	3,900,000				4,400,000	13,500,000	15,400,000
FDIC loss sharing income	8,280,000				21,643,000	21,096,000	45,078,000
Allowance for covered loan losses	48,327,000	46,156,000	42,835,000	48,112,000	51,044,000	48,327,000	51,044,000	31,555,000	16,493,000
Covered Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Loss share expenses primarily related to losses on covered OREO	$ 4,300,000					$ 7,400,000