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Liquidity - Additional Information (Detail) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2014 USD ($) Financial_Institution | Dec. 31, 2012 USD ($)
--- | --- | --- | --- | ---
Line of Credit Facility [Line Items] |  |  |  |
Cash on deposit with bank subsidiary | $ 4,348,654,000 | $ 3,809,737,000 |  |
Percentage of borrowings from FHLB (up to) | 1.41% |  |  |
Total borrowing capacity based on pledged collateral | $ 802,900,000 |  |  |
Borrowing capacity available based on pledged collateral | 652,900,000 |  |  |
Bank's FHLB borrowings | 150,000,000 | 315,000,000 |  |
Borrowings | 0 |  |  |
Line of credit |  |  | $ 95,000,000 |
Number of financial institutions | Financial_Institution |  |  | 3 |
Hanmi Bank [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Cash on deposit with bank subsidiary | 13,100,000 |  |  |
Broker deposits | $ 187,300,000 |  |  |
Percentage of borrowings from FHLB (up to) | 30.00% |  |  |
Total borrowing capacity based on pledged collateral | $ 802,900,000 | 736,600,000 |  |
Borrowing capacity available based on pledged collateral | 652,900,000 | 421,600,000 |  |
Bank's FHLB borrowings | 150,000,000 | $ 315,000,000 |  |
Amount available from borrowing source | 8,500,000 |  |  |
Carrying value for loans pledged by Bank | 9,000,000 |  |  |
Borrowings | $ 0 |  |  |
Maximum borrowing capacity of line of credit |  |  |  | $ 100,000,000

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- Definition Borrowing capacity available based on pledged collateral. + References No definition available. + Details
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- Definition Borrowing capacity based on pledged collateral. + References No definition available. + Details
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- Definition Carrying value for loans pledged by bank. + References No definition available. + Details
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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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 3: 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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