XML 109 R23.htm IDEA: XBRL DOCUMENT
v2.4.0.6

FEDERAL FUNDS PURCHASED | 12 Months Ended
--- | ---
Dec. 31, 2011
FEDERAL FUNDS PURCHASED. |
FEDERAL FUNDS PURCHASED |
16. FEDERAL FUNDS PURCHASED Federal funds purchased generally mature within one business day to six months from the transaction date. Federal funds purchased are included in notes payable and other borrowings. The following table provides information on Federal funds purchased for the periods indicated:
|  | As of and for the Year Ended December 31, |
--- | --- | --- | ---
|  | 2011 |  | 2010 |  | 2009 |
|  | (Dollars in thousands) |
Balance at end of year |  | $ | — |  | $ | 22 |  | $ | 22 |
Average balance outstanding during the year |  | $ | 3,496 |  | $ | 871 |  | $ | 2,379 |
Maximum balance outstanding at any month-end |  | $ | 100,000 |  | $ | 6,023 |  | $ | 3,022 |
Weighted average interest rate during the year |  |  | 0.10 | % |  | 0.20 | % |  | 0.37 | %
Weighted average interest rate at end of year |  |  | — | % |  | 0.15 | % |  | 0.06 | %
As a means of augmenting its liquidity, the Company has established Federal funds lines with several correspondent banks. The Company's available borrowing capacity from Federal funds line facilities amounted to $563.0 million and $313.0 million as of December 31, 2011 and 2010, respectively.

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

X
- Definition The entire disclosure for borrowed amount by a bank, at the federal funds rate, from another bank to meet its reserve requirements. + References No definition available. + Details
Name: | ewbc_FederalFundsPurchasedDisclosureTextBlock
Namespace Prefix: | ewbc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration