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GOODWILL AND OTHER INTANGIBLE ASSETS (Details) (USD $) | 12 Months Ended |  |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 Y Segment | Dec. 31, 2010 | Mar. 31, 2010 Segment | Dec. 31, 2009 | Nov. 30, 2009 Segment | Mar. 31, 2009 Segment | Dec. 31, 2008 | Dec. 31, 2011 Premiums on acquired deposits | Dec. 31, 2010 Premiums on acquired deposits | Dec. 31, 2009 Premiums on acquired deposits | Dec. 31, 2010 Washington First International Bank Premiums on acquired deposits | Dec. 31, 2009 United Commercial Bank Premiums on acquired deposits
GOODWILL AND OTHER INTANGIBLE ASSETS |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 337,438,000 |  |  | $ 337,438,000 |  |  |  |  |  |  |  |
Market capitalization | 2,990,000,000 |  |  |  |  |  |  |  |  |  |  |
Total stockholders' equity | 2,311,743,000 | 2,113,931,000 |  | 2,284,659,000 |  |  | 1,550,766,000 |  |  |  |  |
Number of business divisions | 3 |  | 3 |  |  | 3 |  |  |  |  |  |
Number of operating segments | 3 |  | 3 |  | 4 |  |  |  |  |  |  |
Period for which the company provided a net income projection under the income approach to determine the fair value of the reporting units (in years) | 5 |  |  |  |  |  |  |  |  |  |  |
Changes in carrying amount of goodwill |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year | 337,438,000 |  |  | 337,438,000 |  |  |  |  |  |  |  |
Balance, end of year | 337,438,000 |  |  | 337,438,000 |  |  |  |  |  |  |  |
Premiums on Acquired Deposits |  |  |  |  |  |  |  |  |  |  |  |
Premiums on acquired deposits |  |  |  |  |  |  |  | 117,600,000 | 117,600,000 |  | 3,100,000 | 74,400,000
Accumulated amortization for premiums on acquired deposits |  |  |  |  |  |  |  | 50,400,000 | 38,100,000 |  |  |
Amortization expense of premiums on acquired deposits |  |  |  |  |  |  |  | 12,300,000 | 13,300,000 | 5,900,000 |  |
Estimated Future Amortization Expense of Premiums on Acquired Deposits |  |  |  |  |  |  |  |  |  |  |  |
2012 |  |  |  |  |  |  |  | 10,906,000 |  |  |  |
2013 |  |  |  |  |  |  |  | 9,364,000 |  |  |  |
2014 |  |  |  |  |  |  |  | 8,454,000 |  |  |  |
2015 |  |  |  |  |  |  |  | 7,543,000 |  |  |  |
2016 |  |  |  |  |  |  |  | 6,634,000 |  |  |  |
Thereafter |  |  |  |  |  |  |  | 24,289,000 |  |  |  |
Total |  |  |  |  |  |  |  | $ 67,190,000 |  |  |  |

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