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Condensed Financial Information of Parent Company - Statement of Cash Flows of Parent Company (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash flows from operating activities: |  |  |
Net income | $ 49,761,000 us-gaap_NetIncomeLoss | $ 39,857,000 us-gaap_NetIncomeLoss | $ 90,324,000 us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash used in operating activities: |  |  |
Amortization of subordinated debentures | 71,000 us-gaap_AmortizationOfDebtDiscountPremium |  |
Share-based compensation expense | 2,165,000 us-gaap_ShareBasedCompensation | 705,000 us-gaap_ShareBasedCompensation | 478,000 us-gaap_ShareBasedCompensation
Changes in fair value of stock warrants |  | 83,000 us-gaap_FairValueAdjustmentOfWarrants | 23,000 us-gaap_FairValueAdjustmentOfWarrants
Bargain purchase gain | (14,577,000)us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount |  |
Gain on sale of investment securities | (2,011,000)us-gaap_GainLossOnSaleOfSecuritiesNet | (1,039,000)us-gaap_GainLossOnSaleOfSecuritiesNet | (1,396,000)us-gaap_GainLossOnSaleOfSecuritiesNet
Other-than-temporary loss on investment securities | 0 us-gaap_ImpairmentOfInvestments | 0 us-gaap_ImpairmentOfInvestments | 292,000 us-gaap_ImpairmentOfInvestments
Change in other assets | (7,456,000)us-gaap_IncreaseDecreaseInOtherOperatingAssets | (4,854,000)us-gaap_IncreaseDecreaseInOtherOperatingAssets | 422,000 us-gaap_IncreaseDecreaseInOtherOperatingAssets
Change in other liabilities | 4,914,000 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities | 2,375,000 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities | 1,029,000 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash provided by (used in) operating activities | 25,467,000 us-gaap_NetCashProvidedByUsedInOperatingActivities | 60,718,000 us-gaap_NetCashProvidedByUsedInOperatingActivities | 52,827,000 us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities: |  |  |
Proceeds from sale of security available for sale | 169,533,000 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 78,473,000 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 102,538,000 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Cash acquired in acquisition, net of cash consideration paid | 118,533,000 us-gaap_CashAcquiredFromAcquisition |  |
Net cash (used in) provided by investing activities | 16,397,000 us-gaap_NetCashProvidedByUsedInInvestingActivities | (304,366,000)us-gaap_NetCashProvidedByUsedInInvestingActivities | (37,158,000)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities: |  |  |
Proceeds from exercise of stock options and stock warrants | 467,000 us-gaap_ProceedsFromStockOptionsExercised | 525,000 us-gaap_ProceedsFromStockOptionsExercised | 10,000 us-gaap_ProceedsFromStockOptionsExercised
Redemption of subordinated debentures |  | (82,406,000)hafc_RedemptionOfJuniorSubordinatedNotes |
Cash dividend paid | (6,694,000)us-gaap_PaymentsOfDividends | (4,439,000)us-gaap_PaymentsOfDividends |
Net cash (used in) provided by financing activities | (62,901,000)us-gaap_NetCashProvidedByUsedInFinancingActivities | 154,958,000 us-gaap_NetCashProvidedByUsedInFinancingActivities | 50,695,000 us-gaap_NetCashProvidedByUsedInFinancingActivities
Net increase (decrease) in cash | (21,037,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (88,690,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 66,364,000 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year | 179,357,000 us-gaap_CashCashEquivalentsAndFederalFundsSold | 268,047,000 us-gaap_CashCashEquivalentsAndFederalFundsSold | 201,683,000 us-gaap_CashCashEquivalentsAndFederalFundsSold
Cash and cash equivalents at end of period | 158,320,000 us-gaap_CashCashEquivalentsAndFederalFundsSold | 179,357,000 us-gaap_CashCashEquivalentsAndFederalFundsSold | 268,047,000 us-gaap_CashCashEquivalentsAndFederalFundsSold
Hanmi Financial [Member] |  |  |
Cash flows from operating activities: |  |  |
Net income | 49,761,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 39,857,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 90,324,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Adjustments to reconcile net income to net cash used in operating activities: |  |  |
(Income) losses from subsidiaries | (39,576,000)us-gaap_IncomeLossFromSubsidiariesBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (42,937,000)us-gaap_IncomeLossFromSubsidiariesBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (96,300,000)us-gaap_IncomeLossFromSubsidiariesBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Amortization of subordinated debentures | 71,000 us-gaap_AmortizationOfDebtDiscountPremium / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Share-based compensation expense | 2,165,000 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 705,000 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 478,000 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Changes in fair value of stock warrants |  | 82,000 us-gaap_FairValueAdjustmentOfWarrants / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 23,000 us-gaap_FairValueAdjustmentOfWarrants / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Bargain purchase gain | (14,577,000)us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Gain on sale of investment securities |  | (218,000)us-gaap_GainLossOnSaleOfSecuritiesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Other-than-temporary loss on investment securities |  |  | 292,000 us-gaap_ImpairmentOfInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Change in other assets | (2,319,000)us-gaap_IncreaseDecreaseInOtherOperatingAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (923,000)us-gaap_IncreaseDecreaseInOtherOperatingAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (330,000)us-gaap_IncreaseDecreaseInOtherOperatingAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Change in other liabilities | 15,715,000 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (8,897,000)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,481,000)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided by (used in) operating activities | 11,240,000 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (12,331,000)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (6,994,000)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash flows from investing activities: |  |  |
Proceeds from sale of security available for sale |  | 436,000 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Cash acquired in acquisition, net of cash consideration paid | 116,967,000 us-gaap_CashAcquiredFromAcquisition / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Proceeds from Hanmi Bank | 76,231,000 us-gaap_ProceedsFromContributionsFromAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 86,845,000 us-gaap_ProceedsFromContributionsFromAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Payments to Hanmi Bank | (193,179,000)hafc_PaymentOfContributionsToSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Net cash (used in) provided by investing activities | 19,000 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 87,281,000 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Cash flows from financing activities: |  |  |
Proceeds from exercise of stock options and stock warrants | 467,000 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 830,000 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10,000 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Redemption of subordinated debentures |  | (82,406,000)hafc_RedemptionOfJuniorSubordinatedNotes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Cash dividend paid | (6,694,000)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (4,439,000)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Net cash (used in) provided by financing activities | (6,227,000)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (86,015,000)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10,000 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net increase (decrease) in cash | 5,032,000 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (11,065,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (6,984,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at beginning of year | 13,657,000 us-gaap_CashCashEquivalentsAndFederalFundsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 24,722,000 us-gaap_CashCashEquivalentsAndFederalFundsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 31,706,000 us-gaap_CashCashEquivalentsAndFederalFundsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at end of period | $ 18,689,000 us-gaap_CashCashEquivalentsAndFederalFundsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 13,657,000 us-gaap_CashCashEquivalentsAndFederalFundsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 24,722,000 us-gaap_CashCashEquivalentsAndFederalFundsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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