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Subordinated Debentures - Summary of Trust Preferred Securities and Debentures (Details) (USD $) | Sep. 30, 2014 | Dec. 31, 2013
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Subordinated Borrowing [Line Items] |  |  |
Carrying Value of Subordinated Debentures Amount | $ 42,117,000 |  | $ 57,410,000
Nara Capital Trust III |  |  |
Subordinated Borrowing [Line Items] |  |  |
Initial Rate | 4.44% |  |
Coupon Rate at June 30, 2014 | 3.38% |  |
Nara Statutory Trust IV |  |  |
Subordinated Borrowing [Line Items] |  |  |
Initial Rate | 4.02% |  |
Coupon Rate at June 30, 2014 | 3.08% |  |
Nara Statutory Trust V |  |  |
Subordinated Borrowing [Line Items] |  |  |
Initial Rate | 4.12% |  |
Coupon Rate at June 30, 2014 | 3.19% |  |
Nara Statutory Trust VI |  |  |
Subordinated Borrowing [Line Items] |  |  |
Initial Rate | 7.00% |  |
Coupon Rate at June 30, 2014 | 1.88% |  |
Center Capital Trust I |  |  |
Subordinated Borrowing [Line Items] |  |  |
Initial Rate | 4.01% | [1] |
Coupon Rate at June 30, 2014 | 3.08% | [1] |
Unamortized discount | 5,300,000 |  |
Effective percentage | 5.54% |  |
Trust Preferred Security Amount |  |  |
Subordinated Borrowing [Line Items] |  |  |
Trust Preferred Security Amount | 46,000,000 |  |
Trust Preferred Security Amount | Nara Capital Trust III |  |  |
Subordinated Borrowing [Line Items] |  |  |
Trust Preferred Security Amount | 5,000,000 |  |
Trust Preferred Security Amount | Nara Statutory Trust IV |  |  |
Subordinated Borrowing [Line Items] |  |  |
Trust Preferred Security Amount | 5,000,000 |  |
Trust Preferred Security Amount | Nara Statutory Trust V |  |  |
Subordinated Borrowing [Line Items] |  |  |
Trust Preferred Security Amount | 10,000,000 |  |
Trust Preferred Security Amount | Nara Statutory Trust VI |  |  |
Subordinated Borrowing [Line Items] |  |  |
Trust Preferred Security Amount | 8,000,000 |  |
Trust Preferred Security Amount | Center Capital Trust I |  |  |
Subordinated Borrowing [Line Items] |  |  |
Trust Preferred Security Amount | 18,000,000 | [1] |
Subordinated Debentures Amount |  |  |
Subordinated Borrowing [Line Items] |  |  |
Carrying Value of Subordinated Debentures Amount | 42,117,000 |  |
Subordinated Debentures Amount | Nara Capital Trust III |  |  |
Subordinated Borrowing [Line Items] |  |  |
Carrying Value of Subordinated Debentures Amount | 5,155,000 |  |
Subordinated Debentures Amount | Nara Statutory Trust IV |  |  |
Subordinated Borrowing [Line Items] |  |  |
Carrying Value of Subordinated Debentures Amount | 5,155,000 |  |
Subordinated Debentures Amount | Nara Statutory Trust V |  |  |
Subordinated Borrowing [Line Items] |  |  |
Carrying Value of Subordinated Debentures Amount | 10,310,000 |  |
Subordinated Debentures Amount | Nara Statutory Trust VI |  |  |
Subordinated Borrowing [Line Items] |  |  |
Carrying Value of Subordinated Debentures Amount | 8,248,000 |  |
Subordinated Debentures Amount | Center Capital Trust I |  |  |
Subordinated Borrowing [Line Items] |  |  |
Carrying Value of Subordinated Debentures Amount | $ 13,249,000 | [1] |
[1] | The Center Capital Trust I trust preferred security was assumed in the merger with Center Financial Corporation. The remaining discount was $5.3 million at September 30, 2014 and the effective rate of the security, including the effect of the discount accretion, was 5.54% at September 30, 2014.

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- Definition Trust Preferred Security Amount + References No definition available. + Details
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- Definition Trust Preferred Security, Unamortized Discount + References No definition available. + Details
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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section F Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 19, 20, 22 + Details
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