COVERED ASSETS AND FDIC INDEMNIFICATION ASSET (Details 5) (USD $)	3 Months Ended			6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012	Dec. 31, 2012
Covered Nonperforming Assets
Covered nonaccrual loans	$ 178,431,000	[1],[2],[3]		$ 178,431,000	[1],[2],[3]		$ 204,310,000	[1],[2],[3]
Total nonperforming loans	178,431,000			178,431,000			204,310,000
Other real estate owned covered, net	29,836,000			29,836,000			26,808,000
Total covered nonperforming assets	208,267,000			208,267,000			231,118,000
Changes in the accretable yield for the covered loans
Balance at beginning of period	503,476,000		696,666,000	556,986,000		785,165,000
Accretion	(84,811,000)		(105,416,000)	(166,438,000)		(184,822,000)
Changes in expected cash flows	40,052,000		29,218,000	68,169,000		20,125,000
Balance at end of period	458,717,000		620,468,000	458,717,000		620,468,000
Covered assets - other disclosures
Amount of loans removed from the covered loans accounted under ASC 310-30, excluding scheduled principal payments				392,700,000		459,000,000
Loan discount related to payoffs and removals of loans				74,300,000		42,400,000
Covered loans accounted for under ASC 310-10
Covered Nonperforming Assets
Covered nonaccrual loans	31,100,000			31,100,000			29,600,000
Covered OREO Properties
Covered Nonperforming Assets
Number of covered OREO properties added during the period				15
Aggregate carrying value of covered OREO properties	29,800,000			29,800,000			26,800,000
Aggregate carrying value of covered OREO properties added during the period				20,200,000
Net adjustments included in aggregate carrying value on covered OREO properties				750,000
Number of covered OREO properties sold during the period				31
Total proceeds value of covered OREO properties sold during the period				19,200,000
Combined net gains (losses) on covered OREO properties sold during the period				$ 2,800,000
Covered OREO Properties | Geographic Concentration | California
Credit Risk and Concentrations
Percent of total				54.00%
Covered OREO Properties | Geographic Concentration | Washington
Credit Risk and Concentrations
Percent of total				15.00%
United Commercial Bank (UCB)
Credit Risk and Concentrations
Percent of total				94.00%
Number of general geographic regions				3
United Commercial Bank (UCB) | Geographic Concentration | California
Credit Risk and Concentrations
Percent of total				64.00%
United Commercial Bank (UCB) | Geographic Concentration | New York
Credit Risk and Concentrations
Percent of total				11.00%
United Commercial Bank (UCB) | Geographic Concentration | Hong Kong
Credit Risk and Concentrations
Percent of total				10.00%

[1] Includes $31.1 million and $29.6 million of loans at June 30, 2013 and December 31, 2012, respectively, accounted for under ASC 310-10, of which some loans have additional partial balances accounted for under ASC 310-30.

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

[3] Represents principal balance net of discount.