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Subordinated Debentures and Convertible Notes - Summary of Trust Preferred Securities and Debentures (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
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Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | $ 126,000,000.0 |
Carrying Value of Debentures | 102,477,000 | $ 101,929,000
Trust Preferred Security Amount |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | 126,000,000 |
Carrying Value of Debentures |  |
Subordinated Borrowing [Line Items] |  |
Carrying Value of Debentures | $ 102,477,000 | $ 102,200,000
Nara Capital Trust III |  |
Subordinated Borrowing [Line Items] |  |
Current Rate | 5.56% |
Nara Capital Trust III | Trust Preferred Security Amount |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | $ 5,000,000 |
Nara Capital Trust III | Carrying Value of Debentures |  |
Subordinated Borrowing [Line Items] |  |
Carrying Value of Debentures | $ 5,155,000 |
Nara Statutory Trust IV |  |
Subordinated Borrowing [Line Items] |  |
Current Rate | 5.45% |
Nara Statutory Trust IV | Trust Preferred Security Amount |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | $ 5,000,000 |
Nara Statutory Trust IV | Carrying Value of Debentures |  |
Subordinated Borrowing [Line Items] |  |
Carrying Value of Debentures | $ 5,155,000 |
Nara Statutory Trust V |  |
Subordinated Borrowing [Line Items] |  |
Current Rate | 5.36% |
Nara Statutory Trust V | Trust Preferred Security Amount |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | $ 10,000,000 |
Nara Statutory Trust V | Carrying Value of Debentures |  |
Subordinated Borrowing [Line Items] |  |
Carrying Value of Debentures | $ 10,310,000 |
Nara Statutory Trust VI |  |
Subordinated Borrowing [Line Items] |  |
Current Rate | 4.06% |
Nara Statutory Trust VI | Trust Preferred Security Amount |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | $ 8,000,000 |
Nara Statutory Trust VI | Carrying Value of Debentures |  |
Subordinated Borrowing [Line Items] |  |
Carrying Value of Debentures | $ 8,248,000 |
Center Capital Trust I |  |
Subordinated Borrowing [Line Items] |  |
Current Rate | 5.45% |
Center Capital Trust I | Trust Preferred Security Amount |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | $ 18,000,000 |
Center Capital Trust I | Carrying Value of Debentures |  |
Subordinated Borrowing [Line Items] |  |
Carrying Value of Debentures | $ 14,128,000 |
Wilshire Trust II |  |
Subordinated Borrowing [Line Items] |  |
Current Rate | 4.20% |
Wilshire Trust II | Trust Preferred Security Amount |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | $ 20,000,000 |
Wilshire Trust II | Carrying Value of Debentures |  |
Subordinated Borrowing [Line Items] |  |
Carrying Value of Debentures | $ 15,634,000 |
Wilshire Trust III |  |
Subordinated Borrowing [Line Items] |  |
Current Rate | 3.81% |
Wilshire Trust III | Trust Preferred Security Amount |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | $ 15,000,000 |
Wilshire Trust III | Carrying Value of Debentures |  |
Subordinated Borrowing [Line Items] |  |
Carrying Value of Debentures | $ 11,041,000 |
Wilshire Trust IV |  |
Subordinated Borrowing [Line Items] |  |
Current Rate | 3.79% |
Wilshire Trust IV | Trust Preferred Security Amount |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | $ 25,000,000 |
Wilshire Trust IV | Carrying Value of Debentures |  |
Subordinated Borrowing [Line Items] |  |
Carrying Value of Debentures | $ 17,899,000 |
Saehan Capital Trust I |  |
Subordinated Borrowing [Line Items] |  |
Current Rate | 3.94% |
Saehan Capital Trust I | Trust Preferred Security Amount |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | $ 20,000,000 |
Saehan Capital Trust I | Carrying Value of Debentures |  |
Subordinated Borrowing [Line Items] |  |
Carrying Value of Debentures | $ 14,907,000 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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