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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Taxes [Line Items] |  |  |
Unrecognized tax benefits that would affect our effective tax rate if recognized | $ 1,500,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | $ 1,000,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | $ 1,000,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Unrecognized tax benefits decreased relating to acquisitions |  |  | 27,000 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromAcquisition
Increase in unrecognized tax benefits related to California Enterprise Zone interest deduction | 676,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions |  | 14,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Decrease in unrecognized tax benefits related to non-qualified stock option | 165,000 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions |  |
Addition in Unrecognized tax benefits except increase in accrued interest | 0 us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease | 0 us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease |
Accrued interest on uncertain tax benefits | 52,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued | 45,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued | 41,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued
Accrued interest related to uncertain tax positions, net of federal tax benefit | 366,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 403,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 360,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Income tax years under examination | December 31, 2004 through 2013 |  |
Net valuation allowance release |  |  | 62,600,000 hafc_ReleaseOfValuationAllowance
Increase in deferred tax assets, allowance for loan losses and net operating loss carryforwards |  |  | 18,300,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Valuation allowance | 0 us-gaap_DeferredTaxAssetsValuationAllowance | 0 us-gaap_DeferredTaxAssetsValuationAllowance | 0 us-gaap_DeferredTaxAssetsValuationAllowance
Operating loss carryforwards, maturity date | 2033 |  |
Minimum [Member] |  |  |
Income Taxes [Line Items] |  |  |
Year open to examination | 2004 |  |
Maximum [Member] |  |  |
Income Taxes [Line Items] |  |  |
Year open to examination | 2013 |  |
Federal [Member] |  |  |
Income Taxes [Line Items] |  |  |
Year open to examination | 2009 |  |
Net operating loss carryforwards | 20,900,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |  |
State income tax [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards | $ 245,800,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
State income tax [Member] | Minimum [Member] |  |  |
Income Taxes [Line Items] |  |  |
Year open to examination | 2008 |  |
State income tax [Member] | Maximum [Member] |  |  |
Income Taxes [Line Items] |  |  |
Year open to examination | 2009 |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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