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SUBSEQUENT EVENTS (Details) (USD $) | Oct. 19, 2011 Preferred Stock, Series A [Member] Dividend Approved for Payment [Member] | Oct. 19, 2011 Common Stock [Member] Dividend Declared [Member] | Jul. 20, 2011 Common Stock [Member]
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Subsequent Event [Line Items] |  |  |
Dividend declaration date | October 19, 2011 | October 19, 2011 | July 20, 2011
Dividend per share (in dollars per share) | $ 20.00 | $ 0.05 | $ 0.05
Dividend payment date | November 1, 2011 | November 24, 2011 | August 24, 2011
Dividend record date | October 15, 2011 | November 10, 2011 | August 10, 2011

X
- Definition The day, month and year (YYYY-MM-DD) that the dividend to be paid was declared. + Details
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Data Type: | invest:dateStringItemType
Balance Type: | na
Period Type: | instant

X
- Definition The date as of when a holder must own the stock to be entitled to the dividend. + Details
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Namespace Prefix: | ewbc
Data Type: | invest:dateStringItemType
Balance Type: | na
Period Type: | instant

X
- Definition The day, month, and year (YYYY-MM-DD) that the dividend declared as of or prior to the financial reporting date will be paid in the subsequent period. + Details
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Namespace Prefix: | ewbc
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Balance Type: | na
Period Type: | instant

X
- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + Details
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