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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | ---
Mar. 31, 2014 | Jun. 30, 2013 | Dec. 31, 2014 | Mar. 31, 2010
Accounting Policies [Line Items] |  |  |  |
Period of utilization rate and historical loss rates used for breaking down commitments by loan type | 48 months | 36 months |  |
Business combination, date of completion |  |  | Under the acquisition method of accounting in accordance with ASC Topic 805, “Business Combinations.” Under the acquisition method, the acquiring entity in a business combination recognizes 100 percent of the acquired assets and assumed liabilities, regardless of the percentage owned, at their estimated fair values as of the date of acquisition. Any excess of the purchase price over the fair value of net assets and other identifiable intangible assets acquired is recorded as goodwill. To the extent the fair value of net assets acquired, including other identifiable assets, exceeds the purchase price, a bargain purchase gain is recognized. Assets acquired and liabilities assumed from contingencies must also be recognized at fair value, if the fair value can be determined during the measurement period. Results of operations of an acquired business are included in the statement of earnings from the date of acquisition. Acquisition-related costs, including conversion and restructuring charges, are expensed as incurred. |
Hanmi Bank [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Number of shares exchanged for each of the Bank's share |  |  | 1 us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
General loan pools [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Number of loan pools |  |  | 11 hafc_LoanPools / us-gaap_FinancialInstrumentAxis = hafc_GeneralLoanPoolsMember |
Homogeneous loan pools [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Number of loan pools |  |  | 3 hafc_LoanPools / us-gaap_FinancialInstrumentAxis = hafc_HomogeneousLoanPoolsMember |
Nonperforming Financing Receivable [Member] | Non-PCI Loans [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Delinquency period of loans with respect to interest or principal for discontinuance of accrual of interest income |  |  | 90 days |
Maximum [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Period of utilization rate and historical loss rates used for breaking down commitments by loan type |  |  |  | 36 months
Maximum [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Delinquency period of loans with respect to interest or principal for discontinuance of accrual of interest income |  |  | 90 days |
Minimum [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Period of utilization rate and historical loss rates used for breaking down commitments by loan type |  |  |  | 24 months
CANADA | Full Service [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Number of branches |  |  | 49 hafc_NumberOfBranches / us-gaap_ProductOrServiceAxis = hafc_FullServiceMember / us-gaap_StatementGeographicalAxis = country_CA |
Most recent four quarters [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Risk factor calculations | 8.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = hafc_MostRecentFourQuartersMember | 50.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = hafc_MostRecentFourQuartersMember |  | 60.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = hafc_MostRecentFourQuartersMember
Next four quarters [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Risk factor calculations | 31.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = hafc_NextFourQuartersMember | 33.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = hafc_NextFourQuartersMember |  |
Oldest four quarters [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Risk factor calculations | 46.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = hafc_OldestFourQuartersMember | 17.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = hafc_OldestFourQuartersMember |  | 40.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = hafc_OldestFourQuartersMember
Third four quarters [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Risk factor calculations | 15.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = hafc_ThirdFourQuartersMember |  |  |

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