COVERED ASSETS AND FDIC INDEMNIFICATION ASSET (Details 5) (USD $)					3 Months Ended			9 Months Ended							9 Months Ended	12 Months Ended		9 Months Ended			12 Months Ended	9 Months Ended		0 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Covered loans accounted for under ASC 310-10	Dec. 31, 2013 Covered loans accounted for under ASC 310-10	Sep. 30, 2014 Covered loans		Sep. 30, 2013 Covered loans	Sep. 30, 2014 Covered loans		Sep. 30, 2013 Covered loans	Dec. 31, 2013 Covered loans		Sep. 30, 2014 Covered loans PCI Covered Loans	Dec. 31, 2013 Covered loans PCI Covered Loans	Sep. 30, 2014 Covered loans Covered OREO Properties item	Dec. 31, 2013 Covered loans Covered OREO Properties	Dec. 31, 2013 Covered loans Covered OREO Properties Geographic Concentration California	Sep. 30, 2014 Covered loans Covered OREO Properties Geographic Concentration Washington	Sep. 30, 2014 Covered loans Covered OREO Properties Geographic Concentration Wyoming	Sep. 30, 2014 Covered loans Covered OREO Properties Geographic Concentration Georgia	Dec. 31, 2013 Covered loans Covered OREO Properties Geographic Concentration Massachusetts	Sep. 30, 2014 Covered loans United Commercial Bank (UCB) item	Dec. 31, 2013 Covered loans United Commercial Bank (UCB)	Nov. 06, 2009 Covered loans United Commercial Bank (UCB) Covered loans acquired from specific acquiree Geographic Concentration California	Nov. 06, 2009 Covered loans United Commercial Bank (UCB) Covered loans acquired from specific acquiree Geographic Concentration New York	Nov. 06, 2009 Covered loans United Commercial Bank (UCB) Covered loans acquired from specific acquiree Geographic Concentration Hong Kong
Credit Risk and Concentrations
Percentage of the entity's total covered loans acquired from a specific counterparty																						93.00%	93.00%
Percent of total																	31.00%	47.00%	15.00%	13.00%	31.00%			64.00%	11.00%	10.00%
Number of general geographic regions																						3
Covered Nonperforming Assets
Covered nonaccrual loans			$ 9,200,000	$ 17,700,000	$ 79,980,000	[1],[2],[3]		$ 79,980,000	[1],[2],[3]		$ 126,895,000	[1],[2],[3]	$ 70,800,000	$ 109,200,000
Other real estate owned covered, net	7,433,000	21,373,000			7,433,000			7,433,000			21,373,000
Total covered nonperforming assets					87,413,000			87,413,000			148,268,000
Percentage of any reimbursable expense recorded as interest income under ASC 310-30					80.00%			80.00%			80.00%
Covered loans past due 90 days or more but not on nonaccrual					0			0			0
Covered OREO balances															7,400,000	21,400,000
Number of covered OREO properties added during the period															15
Aggregate carrying value of covered OREO properties added during the period															25,000,000
Net valuation adjustments included in aggregate carrying value on covered OREO properties															1,100,000	2,400,000
Number of covered OREO properties sold during the period															21
Total proceeds value of covered OREO properties sold during the period															42,900,000
Total net gains (losses) on covered OREO properties sold during the period															5,000,000
Covered TDR activity
Balance at beginning of period					60,024,000		120,248,000	116,007,000		157,736,000
Additions					477,000		3,453,000	1,264,000		29,246,000
Transfers to covered OREO					0			(1,230,000)
Charge-offs								(1,323,000)		(7,466,000)
Paydowns/ Reductions					(13,960,000)		(4,839,000)	(68,177,000)		(60,654,000)
Balance at end of period					46,541,000		118,862,000	46,541,000		118,862,000
Changes in the accretable yield for the covered loans
Balance at beginning of period					387,127,000		458,717,000	461,545,000		556,986,000
Accretion					(51,296,000)		(100,596,000)	(176,600,000)		(267,035,000)
Changes in expected cash flows					10,563,000		122,140,000	61,449,000		190,310,000
Balance at end of period					346,394,000		480,261,000	346,394,000		480,261,000
Covered assets - other disclosures
Amount reclassified from nonaccretable yield to accretable yield due to changes in loss rate assumptions					11,600,000		113,900,000	50,200,000		153,500,000
Amount of loans removed from the covered loans accounted for under ASC 310-30, excluding scheduled principal payments								524,500,000		560,600,000
Loan discount related to payoffs and removals of loans								$ 73,900,000		$ 130,700,000

[1] Net of discount.

[2] Includes $9.2 million and $17.7 million of covered advances as of September 30, 2014 and December 31, 2013, respectively; and $70.8 million and $109.2 million of PCI loans as of September 30, 2014 and December 31, 2013, respectively.

[3] Covered nonaccrual loans include loans that meet the criteria for nonaccrual but have a yield accreted through interest income under ASC 310-30. All losses on covered loans are 80% reimbursed by the FDIC.