COVERED ASSETS AND FDIC INDEMNIFICATION ASSET (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Financing Receivable Allowance for Credit Losses Roll Forward
Provision for (reversal of) loan losses	$ (15,225)		$ (3,571)		$ (30,158)		$ (16,898)
Ending balance allocated to:
The number of grades used for the loan risk rating system	8				8
Covered loans
Allowance for loan losses disclosures
Principal balance	1,789,139	[1]			1,789,139	[1]			2,461,560	[2]
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	4,880		9,629		7,745		5,153
Provision for (reversal of) loan losses	7,669		(964)		5,704		4,848
Charge-offs	(9,360)				(10,260)		(1,336)
Recoveries	721				721
Ending balance	3,910		8,665		3,910		8,665
Ending balance allocated to:
Collectively evaluated for impairment	3,486	[3]	6,328	[4]	3,486	[3]	6,328	[4]
Acquired with deteriorated credit quality	424		2,337		424		2,337
Ending balance	3,910		8,665		3,910		8,665
Covered loans | Commercial and Industrial ("C&I")
Financing Receivable Allowance for Credit Losses Roll Forward
Ending balance	2,400		3,700		2,400		3,700
Ending balance allocated to:
Ending balance	2,400		3,700		2,400		3,700
Covered loans | Commercial Real Estate ("CRE")
Allowance for loan losses disclosures
Principal balance	836,789				836,789				1,267,363
Financing Receivable Allowance for Credit Losses Roll Forward
Ending balance	645		2,200		645		2,200
Ending balance allocated to:
Ending balance	645		2,200		645		2,200
Covered loans | Consumer
Financing Receivable Allowance for Credit Losses Roll Forward
Ending balance	232		376		232		376
Ending balance allocated to:
Ending balance	232		376		232		376
Covered loans | Residential
Allowance for loan losses disclosures
Principal balance	579,828				579,828				693,603
Financing Receivable Allowance for Credit Losses Roll Forward
Ending balance	163		161		163		161
Ending balance allocated to:
Ending balance	163		161		163		161
Covered loans | Covered Advances
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	3,692		7,100		5,476		5,153
Provision for (reversal of) loan losses	8,433		(772)		7,549		2,511
Charge-offs	(9,360)				(10,260)		(1,336)
Recoveries	721				721
Ending balance	3,486	[3]	6,328	[4]	3,486	[3]	6,328	[4]
Ending balance allocated to:
Collectively evaluated for impairment	3,486	[3]	6,328	[4]	3,486	[3]	6,328	[4]
Ending balance	3,486	[3]	6,328	[4]	3,486	[3]	6,328	[4]
Covered loans | PCI Covered Loans
Allowance for loan losses disclosures
Principal balance	64,900				64,900				129,700
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	1,188		2,529		2,269
Provision for (reversal of) loan losses	(764)		(192)		(1,845)		2,337
Ending balance	424		2,337		424		2,337
Ending balance allocated to:
Acquired with deteriorated credit quality	424		2,337		424		2,337
Ending balance	$ 424		$ 2,337		$ 424		$ 2,337

[1] Includes $290.4 million of covered advances comprised of $191.1 million, $59.6 million, $27.6 million and $12.1 million of commercial and industrial, commercial real estate, consumer, and residential loans, respectively.

[2] Includes $320.2 million of covered advances comprised of $230.6 million, $46.7 million, $30.9 million and $12.0 million of commercial and industrial, commercial real estate, consumer and residential loans, respectively.

[3] Allowance for loan losses of $2.4 million, $645 thousand, $232 thousand and $163 thousand are allocated to commercial and industrial, commercial real estate, consumer and residential loans, respectively.

[4] Allowance for loan losses of $3.7 million, $2.2 million, $376 thousand and $161 thousand are allocated to commercial and industrial, commercial real estate, consumer and residential loans, respectively.