NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 12) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Allowance for loan losses disclosures
Allowance on covered loans	$ (5,877,000)		$ (5,877,000)		$ (6,647,000)
Percentage of allowance allocated to additional advances	2.60%		2.60%		3.10%
Provision for covered loans	(5,179,000)	297,000	(5,705,000)	(2,209,000)
Percentage of income from covered loans under loss-sharing agreements with the FDIC	80.00%		80.00%
Specific covered loans outside of the scope of ASC 310-30
Allowance for loan losses disclosures
Charge-offs	6,500,000		6,500,000
Provision for covered loans	5,200,000		5,700,000
Income from covered loans under loss-sharing agreements with the FDIC			5,200,000
Percentage of income from covered loans under loss-sharing agreements with the FDIC	80.00%		80.00%
Loss due to charge-offs			(1,300,000)
Specific covered loans outside of the scope of ASC 310-30 | Commercial Real Estate ("CRE")
Allowance for loan losses disclosures
Charge-offs	1,500,000		1,500,000
Specific covered loans outside of the scope of ASC 310-30 | Commercial and Industrial ("C&I")
Allowance for loan losses disclosures
Charge-offs	$ 5,000,000		$ 5,000,000