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BBCN Bancorp, Inc.	3 Months Ended
	Mar. 31, 2012
BBCN Bancorp, Inc. [Abstract]
BBCN Bancorp, Inc.	1. BBCN Bancorp, Inc. BBCN Bancorp, Inc. ("BBCN Bancorp", on a parent-only basis, and "Company," "we" or "our" on a consolidated basis), formerly named Nara Bancorp, Inc., is a bank holding company headquartered in Los Angeles, California. BBCN Bank ("BBCN Bank" or "the Bank"), formerly named Nara Bank, opened for business in June 1989 under the name "United Citizens National Bank" as a national banking association, was renamed "Nara Bank, National Association" in January 1994 and, in January 2005, became "Nara Bank" upon converting to a California state-chartered bank in connection with its holding company reorganization transaction. On November 30, 2011, we merged with Center Financial Corporation ("Center Financial" or "Center") in a merger of equals transaction. Concurrently with the merger, Nara Bancorp, Inc. ("Nara") changed its name to "BBCN Bancorp, Inc." At the bank level, Nara Bank merged into Center Bank, and concurrently with the merger, Center Bank changed its name to "BBCN Bank." The Bank has branches in California, the New York metropolitan area, New Jersey, Washington and Chicago as well as loan production offices located in Dallas, Seattle and Denver.

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- Definition

Describes the nature of an entity's business, the major products or services it sells or provides and its principal markets, including the locations of those markets. If the entity operates in more than one business, the disclosure also indicates the relative importance of its operations in each business and the basis for the determination (for example, assets, revenues, or earnings). Disclosures about the nature of operations need not be quantified; relative importance could be conveyed by use of terms such as "predominately", "about equally", or "major and other". This element is also referred to as "Business Description".

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 94-6

-Paragraph 10

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