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Accounting for Investments in Qualified Affordable Housing Projects - Additional Information (Detail) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2012 | Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Adjusted Earnings Before Interest Taxes Depreciation And Amortization And Other Non Cash Items [Abstract] |  |  |  |
Cumulative effect of retrospective application of accounting principle | $ 1,100,000 us-gaap_CumulativeEffectOfProspectiveApplicationOfNewAccountingPrinciple |  |  |
Decrease in net income |  |  | 44,000 hafc_DecreaseInNetIncome |
Impairment of investments |  | 0 us-gaap_ImpairmentOfInvestments |  | 0 us-gaap_ImpairmentOfInvestments
Investment in low income housing |  | 20,700,000 hafc_InvestmentsInQualifiedAffordableHousingProjects |  | 21,300,000 hafc_InvestmentsInQualifiedAffordableHousingProjects
Unfunded commitments on low income housing |  | 9,900,000 us-gaap_OtherCommitment |  | 11,900,000 us-gaap_OtherCommitment
Income tax expense |  | 584,000 us-gaap_OtherTaxExpenseBenefit | 171,000 us-gaap_OtherTaxExpenseBenefit |
Tax credit and other benefit received from tax expenses |  | $ 829,000 us-gaap_IncomeTaxReconciliationTaxCredits | $ 255,000 us-gaap_IncomeTaxReconciliationTaxCredits |

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