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Loans - Loans Receivable (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | $ 2,816,557 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | $ 2,785,261 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount |  |
Allowance for loans losses | (52,951)us-gaap_LoansAndLeasesReceivableAllowance | (52,666)us-gaap_LoansAndLeasesReceivableAllowance |  |
Deferred loan costs | 3,474 us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums | 3,237 us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums |  |
Loans receivable, net | 2,767,080 us-gaap_LoansAndLeasesReceivableNetReportedAmount | 2,735,832 us-gaap_LoansAndLeasesReceivableNetReportedAmount | 2,221,520 us-gaap_LoansAndLeasesReceivableNetReportedAmount |
Real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 2,539,939 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember | 2,508,515 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember |  |
Commercial and industrial loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 250,632 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember | 249,189 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember |  |
Consumer loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 25,986 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 27,557 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |  |
Non-PCI Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 2,775,616 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | 2,740,760 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember |  |
Allowance for loans losses | (51,515)us-gaap_LoansAndLeasesReceivableAllowance / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | (51,640)us-gaap_LoansAndLeasesReceivableAllowance / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | (56,593)us-gaap_LoansAndLeasesReceivableAllowance / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | (57,555)us-gaap_LoansAndLeasesReceivableAllowance / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember
Deferred loan costs | 3,474 us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | 3,237 us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember |  |
Loans receivable, net | 2,727,575 us-gaap_LoansAndLeasesReceivableNetReportedAmount / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | 2,692,357 us-gaap_LoansAndLeasesReceivableNetReportedAmount / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember |  |
Non-PCI Loans [Member] | Real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 2,499,323 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | 2,464,386 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember |  |
Allowance for loans losses | (42,550)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | (41,194)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | (44,230)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | (43,550)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember
Non-PCI Loans [Member] | Commercial and industrial loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 250,351 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | 248,862 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember |  |
Allowance for loans losses | (7,786)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | (9,142)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | (10,425)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | (11,287)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember
Non-PCI Loans [Member] | Consumer loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 25,942 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | 27,512 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember |  |
Allowance for loans losses | (185)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | (220)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | (633)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | (1,427)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember
PCI Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 40,941 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | 44,501 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Allowance for loans losses | (1,436)us-gaap_LoansAndLeasesReceivableAllowance / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | (1,026)us-gaap_LoansAndLeasesReceivableAllowance / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Loans receivable, net | 39,505 us-gaap_LoansAndLeasesReceivableNetReportedAmount / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | 43,475 us-gaap_LoansAndLeasesReceivableNetReportedAmount / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
PCI Loans [Member] | Real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 40,616 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | 44,129 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Allowance for loans losses |  | (895)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
PCI Loans [Member] | Commercial and industrial loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 281 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | 327 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Allowance for loans losses |  | (131)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
PCI Loans [Member] | Consumer loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 44 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | 45 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Loans receivable, net | 44 us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | 45 us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Retail [Member] | Real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 690,503 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateRetailMember | 683,607 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateRetailMember |  |
Retail [Member] | Non-PCI Loans [Member] | Real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 679,938 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateRetailMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | 675,072 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateRetailMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember |  |
Retail [Member] | PCI Loans [Member] | Real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 10,565 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateRetailMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | 8,535 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateRetailMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Allowance for loans losses | (404)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateRetailMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | (401)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateRetailMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Loans receivable, net | 10,161 us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateRetailMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | 8,134 us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateRetailMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Hotel/motel [Member] | Real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 493,680 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_HotelAndMotelMember | 462,181 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_HotelAndMotelMember |  |
Hotel/motel [Member] | Non-PCI Loans [Member] | Real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 481,960 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_HotelAndMotelMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | 454,499 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_HotelAndMotelMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember |  |
Hotel/motel [Member] | PCI Loans [Member] | Real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 11,720 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_HotelAndMotelMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | 7,682 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_HotelAndMotelMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Allowance for loans losses | (146)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_HotelAndMotelMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | (99)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_HotelAndMotelMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Loans receivable, net | 11,574 us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_HotelAndMotelMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | 7,583 us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_HotelAndMotelMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Gas station [Member] | Real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 353,239 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_GasolineStationMember | 369,985 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_GasolineStationMember |  |
Gas station [Member] | Non-PCI Loans [Member] | Real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 346,798 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_GasolineStationMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | 362,240 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_GasolineStationMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember |  |
Gas station [Member] | PCI Loans [Member] | Real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 6,441 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_GasolineStationMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | 7,745 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_GasolineStationMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Allowance for loans losses | (555)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_GasolineStationMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | (302)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_GasolineStationMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Loans receivable, net | 5,886 us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_GasolineStationMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | 7,443 us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_GasolineStationMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Other [Member] | Real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 830,881 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateOtherMember | 847,922 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateOtherMember |  |
Other [Member] | Non-PCI Loans [Member] | Real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 820,707 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateOtherMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | 842,126 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateOtherMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember |  |
Other [Member] | PCI Loans [Member] | Real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 10,174 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateOtherMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | 5,796 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateOtherMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Allowance for loans losses | (167)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateOtherMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | (65)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateOtherMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Loans receivable, net | 10,007 us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateOtherMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | 5,731 us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateOtherMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Construction [Member] | Real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 15,123 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateConstructionMember | 9,517 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateConstructionMember |  |
Construction [Member] | Non-PCI Loans [Member] | Real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 15,123 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateConstructionMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | 9,517 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialRealEstateConstructionMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember |  |
Residential property [Member] | Real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 156,513 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_ResidentialPropertyRealEstateLoanMember | 135,303 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_ResidentialPropertyRealEstateLoanMember |  |
Residential property [Member] | Non-PCI Loans [Member] | Real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 154,797 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_ResidentialPropertyRealEstateLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | 120,932 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_ResidentialPropertyRealEstateLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember |  |
Residential property [Member] | PCI Loans [Member] | Real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 1,716 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_ResidentialPropertyRealEstateLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | 14,371 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_ResidentialPropertyRealEstateLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Allowance for loans losses | (46)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_ResidentialPropertyRealEstateLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | (28)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_ResidentialPropertyRealEstateLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Loans receivable, net | 1,670 us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_ResidentialPropertyRealEstateLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | 14,343 us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_FinancialInstrumentAxis = hafc_RealEstateLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_ResidentialPropertyRealEstateLoanMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Commercial term [Member] | Commercial and industrial loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 116,533 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialTermLoansMember | 116,400 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialTermLoansMember |  |
Commercial term [Member] | Non-PCI Loans [Member] | Commercial and industrial loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 116,252 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialTermLoansMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | 116,073 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialTermLoansMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember |  |
Commercial term [Member] | PCI Loans [Member] | Commercial and industrial loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 281 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialTermLoansMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | 327 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialTermLoansMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Allowance for loans losses | (118)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialTermLoansMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | (131)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialTermLoansMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Loans receivable, net | 163 us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialTermLoansMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember | 196 us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialTermLoansMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_PurchaseCreditImpairedLoansMember |  |
Commercial lines of credit [Member] | Commercial and industrial loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 97,761 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialLinesOfCreditMember | 93,860 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialLinesOfCreditMember |  |
Commercial lines of credit [Member] | Non-PCI Loans [Member] | Commercial and industrial loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 97,761 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialLinesOfCreditMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | 93,860 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_CommercialLinesOfCreditMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember |  |
International loans [Member] | Commercial and industrial loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | 36,338 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_InternationalLoansMember | 38,929 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_InternationalLoansMember |  |
International loans [Member] | Non-PCI Loans [Member] | Commercial and industrial loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total gross loans | $ 36,338 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_InternationalLoansMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember | $ 38,929 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = hafc_CommercialAndIndustrialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = hafc_InternationalLoansMember / hafc_ImpairedFinancialReceivableTypeAxis = hafc_NonPurchasedCreditImpairedLoansMember |  |

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