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COVERED ASSETS AND FDIC INDEMNIFICATION ASSET (Details 3) (USD $) | 12 Months Ended |  |  | 12 Months Ended |
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 Covered OREO Properties property | Dec. 31, 2010 Covered OREO Properties property | Dec. 31, 2011 Covered OREO Properties Geographic Concentration California | Dec. 31, 2011 Covered OREO Properties Geographic Concentration Washington | Dec. 31, 2011 United Commercial Bank (UCB) Covered loans | Dec. 31, 2011 United Commercial Bank (UCB) Covered loans Geographic Concentration region | Nov. 06, 2009 United Commercial Bank (UCB) Covered loans Geographic Concentration California | Nov. 06, 2009 United Commercial Bank (UCB) Covered loans Geographic Concentration Hong Kong | Nov. 06, 2009 United Commercial Bank (UCB) Covered loans Geographic Concentration New York
Credit Risk and Concentrations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of total |  |  |  |  |  |  |  | 57.00% | 28.00% | 94.00% |  | 64.00% | 10.00% | 11.00%
Number of general geographic regions |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
Covered Nonperforming Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covered nonaccrual loans | $ 194,506,000 | [1],[2] | $ 379,797,000 | [1],[2] |  |  |  |  |  |  |  |  |  |
Total nonperforming loans | 194,506,000 |  | 379,797,000 |  |  |  |  |  |  |  |  |  |  |
Other real estate owned covered, net | 63,624,000 |  | 123,902,000 |  |  | 63,624,000 | 123,902,000 |  |  |  |  |  |  |
Total covered nonperforming assets | 258,130,000 |  | 503,699,000 |  |  |  |  |  |  |  |  |  |  |
Number of covered OREO properties |  |  |  |  |  | 82 | 114 |  |  |  |  |  |  |
Number of covered OREO properties added during the period |  |  |  |  |  | 131 |  |  |  |  |  |  |  |
Aggregate carrying value of covered OREO properties added during the period |  |  |  |  |  | 122,200,000 |  |  |  |  |  |  |  |
Net writedowns included in aggregate carrying value on covered OREO properties |  |  |  |  |  | 26,300,000 |  |  |  |  |  |  |  |
Number of covered OREO properties sold during the period |  |  |  |  |  | 163 |  |  |  |  |  |  |  |
Total proceeds value of covered OREO properties sold during the period |  |  |  |  |  | 159,200,000 |  |  |  |  |  |  |  |
Combined net gains (losses) on covered OREO properties sold during the period |  |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |
Changes in the accretable yield for the covered loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | 1,153,272,000 |  | 983,107,000 |  |  |  |  |  |  |  |  |  |  |
Additions |  |  | 82,997,000 | [3] |  |  |  |  |  |  |  |  |  |
Accretion | (208,887,000) |  | (183,835,000) |  |  |  |  |  |  |  |  |  |  |
Changes in expected cash flows | (159,220,000) |  | 271,003,000 |  |  |  |  |  |  |  |  |  |  |
Balance at end of period | 785,165,000 |  | 1,153,272,000 |  | 983,107,000 |  |  |  |  |  |  |  |  |
Covered assets - other disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of loans removed from the covered loans accounted under ASC 310-30, excluding scheduled principal payments | 778,700,000 |  | 1,050,000,000 |  | 333,800,000 |  |  |  |  |  |  |  |  |
Loan discount related to payoffs and removals of loans | $ 102,100,000 |  | $ 136,500,000 |  | $ 74,400,000 |  |  |  |  |  |  |  |  |
[1] | Covered nonaccrual loans meet the criteria for nonaccrual but have a yield accreted through interest income under ASC 310-30.
[2] | Represents principal balance net of associated discount.
[3] | The additions included above for the twelve months ended December 31, 2010, resulted from the June 11, 2010 acquisition of WFIB.

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- Definition The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 03-3 -Paragraph 16 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6891207&loc=d3e13503-111538 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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