Stock-Based Compensation - Plan Description (Details)	6 Months Ended
Jun. 30, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)	2,559,938
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price of common stock, percent	100.00%
Restricted stock, performance shares and performance units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock, restriction period	1 year
Time based vesting of grants \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock, restriction period	3 years
BBCN 2007 Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price of common stock, percent	100.00%
BBCN 2007 Plan \| Stock options and stock appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term	10 years
BBCN 2007 Plan \| Stock options and stock appreciation rights \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
BBCN 2007 Plan \| Stock options and stock appreciation rights \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
2006 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage	20.00%
2006 Plan \| Nonemployee director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term	10 years
Award vesting rights, percentage	33.00%

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Percentage of vesting of share-based compensation awards.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Purchase price of common stock expressed as a percentage of its fair value.

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