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Loans Receivable and Allowance for Loan Losses - Covered Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Covered Nonperforming Assets |  |
Covered loans on non-accrual status | $ 1,102 | $ 1,118
Covered other real estate owned | 915 | 220
Total covered nonperforming assets | 2,017 | 1,338
Acquired covered loans | $ 21,769 | $ 22,989

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- Definition Acquired Covered Loans + References No definition available. + Details
Name: | bbcn_AcquiredCoveredLoans
Namespace Prefix: | bbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Covered Loans, Nonaccrual Status + References No definition available. + Details
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Namespace Prefix: | bbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Nonperforming Assets, Covered + References No definition available. + Details
Name: | bbcn_NonperformingAssetsCovered
Namespace Prefix: | bbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Carrying amount of other real estate covered by loss sharing agreements not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations that may also be included in real estate owned. Excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure by banks. + References No definition available. + Details
Name: | us-gaap_OtherRealEstateCovered
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant