XML 107 R12.htm IDEA: XBRL DOCUMENT
v2.4.0.6

SECURITIES PURCHASED UNDER RESALE AGREEMENTS | 12 Months Ended
--- | ---
Dec. 31, 2011
SECURITIES PURCHASED UNDER RESALE AGREEMENTS |
SECURITIES PURCHASED UNDER RESALE AGREEMENTS |
5. SECURITIES PURCHASED UNDER RESALE AGREEMENTS Securities purchased under resale agreements ("resale agreements") increased to $786.4 million as of December 31, 2011, compared with $500.0 million at December 31, 2010. The increase as of December 31, 2011 reflects additions of resale agreements for $1.29 billion entered into during 2011 offset with paydowns and maturities of $1.01 billion. Resale agreements are recorded at the amounts at which the securities were acquired. The Company's policy is to obtain possession of securities purchased under resale agreements that are equal to or greater than the principal amount loaned. The market value of the underlying securities, which collateralize the related receivable on resale agreements, is monitored, including accrued interest. Additional collateral may be requested from the counterparty when determined to be appropriate. Total interest income on resale agreements amounted to $19.2 million, $14.2 million, and $8.0 million, for the years ended December 31, 2011, 2010, and 2009, respectively.

X
- Definition The entire disclosure for repurchase agreements (also known as repos), securities borrowed transactions. Securities purchased under agreements resale are funds outstanding loaned in the form of security resale agreements if the agreement requires the purchaser to resell the identical security purchased or a security that meets the definition of "substantially the same." Also includes purchases of participations in pools of securities that are subject to a resale agreement. + References No definition available. + Details
Name: | ewbc_SecuritiesPurchasedUnderAgreementsToResellDisclosureTextBlock
Namespace Prefix: | ewbc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ewbc_SecuritiesPurchasedUnderResaleAgreementsDisclosureAbstract
Namespace Prefix: | ewbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration