COVERED ASSETS AND FDIC INDEMNIFICATION ASSET (Details 3) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Allowance for loan losses disclosures
Allowance on covered loans	$ 6,518,000		$ 7,745,000
Provision for covered loans	(1,021,000)	5,089,000
Percentage of allowance allocated to covered loans	2.60%		3.10%
Covered loans accounted for under ASC 310-30
Allowance for loan losses disclosures
Allowance on covered loans	2,200,000		2,200,000
Covered loans accounted for under ASC 310-30 | Commercial Real Estate ("CRE")
Allowance for loan losses disclosures
Allowance on covered loans	2,200,000		2,200,000
Specific covered loans outside of the scope of ASC 310-30
Allowance for loan losses disclosures
Allowance on covered loans	6,500,000
Provision for covered loans	(954,000)	3,100,000
Additional advances under shared-loss agreements	281,900,000		320,200,000
Charge-offs	206,000	132,000
Allowance allocated to additional advances	4,300,000		5,500,000
Percentage of allowance allocated to covered loans	1.70%		2.20%
Specific covered loans outside of the scope of ASC 310-30 | Commercial and Industrial ("C&I")
Allowance for loan losses disclosures
Additional advances under shared-loss agreements	219,100,000		230,600,000
Charge-offs		132,000
Allowance allocated to additional advances	2,900,000		3,200,000
Specific covered loans outside of the scope of ASC 310-30 | Commercial Real Estate ("CRE")
Allowance for loan losses disclosures
Additional advances under shared-loss agreements	21,000,000		46,700,000
Allowance allocated to additional advances	887,000		1,800,000
Specific covered loans outside of the scope of ASC 310-30 | Consumer
Allowance for loan losses disclosures
Additional advances under shared-loss agreements	30,700,000		30,900,000
Allowance allocated to additional advances	305,000		341,000
Specific covered loans outside of the scope of ASC 310-30 | Residential
Allowance for loan losses disclosures
Additional advances under shared-loss agreements	11,100,000		12,000,000
Allowance allocated to additional advances	$ 169,000		$ 176,000