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Subordinated Debentures - Summary of Trust Preferred Securities and Debentures (Details) - USD ($) | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Subordinated Borrowing [Line Items] |  |
Carrying Value of Subordinated Debentures Amount | $ 100,067,000 | $ 99,808,000
Trust Preferred Security Amount | 126,000,000 |
Other assets |  |
Subordinated Borrowing [Line Items] |  |
Investment in common trust securities | 3,900,000 | $ 3,900,000
Trust Preferred Security Amount |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | 126,000,000 |
Subordinated Debentures Amount |  |
Subordinated Borrowing [Line Items] |  |
Carrying Value of Subordinated Debentures Amount | $ 100,067,000 |
Nara Capital Trust III |  |
Subordinated Borrowing [Line Items] |  |
Initial Rate | 4.28% |
Nara Capital Trust III | Trust Preferred Security Amount |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | $ 5,000,000 |
Nara Capital Trust III | Subordinated Debentures Amount |  |
Subordinated Borrowing [Line Items] |  |
Carrying Value of Subordinated Debentures Amount | $ 5,155,000 |
Nara Statutory Trust IV |  |
Subordinated Borrowing [Line Items] |  |
Initial Rate | 3.87% |
Nara Statutory Trust IV | Trust Preferred Security Amount |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | $ 5,000,000 |
Nara Statutory Trust IV | Subordinated Debentures Amount |  |
Subordinated Borrowing [Line Items] |  |
Carrying Value of Subordinated Debentures Amount | $ 5,155,000 |
Nara Statutory Trust V |  |
Subordinated Borrowing [Line Items] |  |
Initial Rate | 4.10% |
Nara Statutory Trust V | Trust Preferred Security Amount |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | $ 10,000,000 |
Nara Statutory Trust V | Subordinated Debentures Amount |  |
Subordinated Borrowing [Line Items] |  |
Carrying Value of Subordinated Debentures Amount | $ 10,310,000 |
Nara Statutory Trust VI |  |
Subordinated Borrowing [Line Items] |  |
Initial Rate | 2.78% |
Nara Statutory Trust VI | Trust Preferred Security Amount |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | $ 8,000,000 |
Nara Statutory Trust VI | Subordinated Debentures Amount |  |
Subordinated Borrowing [Line Items] |  |
Carrying Value of Subordinated Debentures Amount | $ 8,248,000 |
Center Capital Trust I |  |
Subordinated Borrowing [Line Items] |  |
Initial Rate | 3.87% |
Center Capital Trust I | Trust Preferred Security Amount |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | $ 18,000,000 |
Center Capital Trust I | Subordinated Debentures Amount |  |
Subordinated Borrowing [Line Items] |  |
Carrying Value of Subordinated Debentures Amount | $ 13,684,000 |
Wilshire Statutory Trust III [Member] |  |
Subordinated Borrowing [Line Items] |  |
Initial Rate | 2.94% |
Wilshire Statutory Trust III [Member] | Trust Preferred Security Amount |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | $ 20,000,000 |
Wilshire Statutory Trust III [Member] | Subordinated Debentures Amount |  |
Subordinated Borrowing [Line Items] |  |
Carrying Value of Subordinated Debentures Amount | $ 15,158,000 |
Wilshire Statutory Trust III [Member] |  |
Subordinated Borrowing [Line Items] |  |
Initial Rate | 2.53% |
Wilshire Statutory Trust III [Member] | Trust Preferred Security Amount |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | $ 15,000,000 |
Wilshire Statutory Trust III [Member] | Subordinated Debentures Amount |  |
Subordinated Borrowing [Line Items] |  |
Carrying Value of Subordinated Debentures Amount | $ 10,635,000 |
Wilshire Statutory Trust IV [Member] |  |
Subordinated Borrowing [Line Items] |  |
Initial Rate | 2.51% |
Wilshire Statutory Trust IV [Member] | Trust Preferred Security Amount |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | $ 25,000,000 |
Wilshire Statutory Trust IV [Member] | Subordinated Debentures Amount |  |
Subordinated Borrowing [Line Items] |  |
Carrying Value of Subordinated Debentures Amount | $ 17,275,000 |
Saehan Capital Trust I [Member] |  |
Subordinated Borrowing [Line Items] |  |
Initial Rate | 2.77% |
Saehan Capital Trust I [Member] | Trust Preferred Security Amount |  |
Subordinated Borrowing [Line Items] |  |
Trust Preferred Security Amount | $ 20,000,000 |
Saehan Capital Trust I [Member] | Subordinated Debentures Amount |  |
Subordinated Borrowing [Line Items] |  |
Carrying Value of Subordinated Debentures Amount | $ 14,447,000 |

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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 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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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 + Details
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