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Subordinated Debentures - Summary of Subordinated Debentures (Details) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
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Subordinated Borrowing [Line Items] |  |
Right to defer consecutive payments of interest, maximum term | 5 years |
Other assets |  |
Subordinated Borrowing [Line Items] |  |
Investment in common trust securities | $ 1,900,000 | $ 1,400,000
Nara Bancorp Grantor Trust |  |
Subordinated Borrowing [Line Items] |  |
Number of grantor trusts issuing securities | 4 |
Center Financial Corporation Grantor Trust |  |
Subordinated Borrowing [Line Items] |  |
Number of grantor trusts issuing securities | 1 |
Pacific International Bancorp, Inc. |  |
Subordinated Borrowing [Line Items] |  |
Number of grantor trusts issuing securities | 1 |
Foster Bankshares Inc |  |
Subordinated Borrowing [Line Items] |  |
Number of grantor trusts issuing securities | 1 |
Trust Preferred Securities Subject to Mandatory Redemption |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | 61,000,000 |
Percent included in tier one capital, maximum | 25.00% |
Excess of percent threshold included in tier two capital | 25.00% |
Tier one risk based capital (less than $15 billion) | 55,500,000 |
Tier One Risk Based Capital, Maximum Holding Amount | 15,000,000,000 |
Trust Preferred Securities Subject to Mandatory Redemption | Nara Bancorp Grantor Trust |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | 28,000,000 |
Trust Preferred Securities Subject to Mandatory Redemption | Center Financial Corporation Grantor Trust |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | 18,000,000 |
Trust Preferred Securities Subject to Mandatory Redemption | Pacific International Bancorp, Inc. |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | $ 15,000,000 |

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- Definition Debt Issuance To Capital, Percent Included in Tier One Capital, Maximum + References No definition available. + Details
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- Definition Tier 1 Risk Based Capital as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826 + Details
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