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Subordinated Debentures and Rescinded Stock Obligation - Additional Information (Detail) (USD $) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Nov. 30, 2014 | Aug. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2005
Debt Instrument [Line Items] |  |  |  |  |
Subordinated debentures | $ 18,544,000 us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust |  |  |  |
Debt instrument discount |  |  | 8,300,000 us-gaap_DebtInstrumentUnamortizedDiscount |  |
Amortization of subordinated debentures | 71,000 us-gaap_AmortizationOfDebtDiscountPremium |  |  |  |
Rescinded stock obligation | 933,000 us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmount | 15,500,000 us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmount |  |  |
Rescinded stock obligation paid off | 14,552,000 us-gaap_RepaymentsOfMandatoryRedeemableCapitalSecurities |  |  |  |
Accrued interest payable | 288,000 us-gaap_InterestPayableCurrent | 4,500,000 us-gaap_InterestPayableCurrent |  |  |
Interest on rescinded stock obligation | 87,000 us-gaap_InterestExpenseCapitalSecurities |  |  |  |
Weighted average interest rate | 6.79%us-gaap_DebtWeightedAverageInterestRate |  |  |  |
Central Bancorp, Inc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Rescinded stock obligation paid off | 14,800,000 us-gaap_RepaymentsOfMandatoryRedeemableCapitalSecurities / us-gaap_BusinessAcquisitionAxis = hafc_CentralBancorpIncMember |  |  |  |
Central Bancorp, Inc [Member] | Subordinated Debentures [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Subordinated debentures, unpaid principal amount |  |  |  | 26,800,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_BusinessAcquisitionAxis = hafc_CentralBancorpIncMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember | 26,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_BusinessAcquisitionAxis = hafc_CentralBancorpIncMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember
Subordinated debentures |  |  |  | 18,500,000 us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust / us-gaap_BusinessAcquisitionAxis = hafc_CentralBancorpIncMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember |
Debt instrument discount |  |  |  | 8,300,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_BusinessAcquisitionAxis = hafc_CentralBancorpIncMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember |
Fixed interest rate |  |  |  |  | 6.26%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_BusinessAcquisitionAxis = hafc_CentralBancorpIncMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember
Variable interest rate basis | 3 month LIBOR plus 140 basis |  |  |  |
Maturity date of subordinated debentures | Dec. 31, 2035 |  |  |  |
Frequency of interest payment | Quarterly |  |  |  |
Amortization of subordinated debentures | $ 71,000 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_BusinessAcquisitionAxis = hafc_CentralBancorpIncMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember |  |  |  |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: 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 + Details
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- Definition The cash outflow related to equity securities that embody an unconditional obligation requiring the issuer to redeem the securities by transferring the assets at a specified or determinable date (or dates) that is (or are) initially more than one year (or the normal operating cycle, if longer) from the issuance date, or upon an event that is certain to occur beyond one year (or the normal operating cycle, if longer) from the issuance date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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