COVERED ASSETS AND FDIC INDEMNIFICATION ASSET (Details 3) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for loan losses disclosures
Allowance on covered loans	$ 7,745,000				$ 5,153,000				$ 7,745,000	$ 5,153,000
Provision for covered loans	(820,000)	(964,000)	723,000	5,089,000	(689,000)	5,179,000	(1,095,000)	1,621,000	4,028,000	5,016,000	2,422,000
Percentage of allowance allocated to covered loans	3.10%								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
Provision for covered loans									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	5,500,000								5,500,000
Provision for covered loans									1,800,000	5,000,000	2,400,000
Additional advances under shared-loss agreements	320,200,000				431,700,000				320,200,000	431,700,000
Charge-offs									1,400,000	6,500,000
Allowance allocated to additional advances	5,500,000				5,200,000				5,500,000	5,200,000
Percentage of allowance allocated to covered loans	2.20%				2.20%				2.20%	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	230,600,000				302,300,000				230,600,000	302,300,000
Charge-offs									1,000,000	5,000,000
Allowance allocated to additional advances	3,200,000				2,400,000				3,200,000	2,400,000
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	46,700,000				83,400,000				46,700,000	83,400,000
Charge-offs									380,000	1,500,000
Allowance allocated to additional advances	1,800,000				2,500,000				1,800,000	2,500,000
Specific covered loans outside of the scope of ASC 310-30 | Consumer
Allowance for loan losses disclosures
Additional advances under shared-loss agreements	30,900,000				34,500,000				30,900,000	34,500,000
Allowance allocated to additional advances	341,000				194,000				341,000	194,000
Specific covered loans outside of the scope of ASC 310-30 | Residential
Allowance for loan losses disclosures
Additional advances under shared-loss agreements	12,000,000				11,500,000				12,000,000	11,500,000
Allowance allocated to additional advances	$ 176,000				$ 87,000				$ 176,000	$ 87,000