Hanmi Financial Corporation Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Additional Information (Detail)	Jun. 30, 2019 USD ($) SecurityLoan	Dec. 31, 2018 USD ($)
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unpaid principal balance of Non-accrual Non-PCI loans reviewed individually for amount of impairment	$ 250,000
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unpaid principal balance of Non-accrual Non-PCI loans reviewed collectively for amount of impairment	$ 250,000
Impaired loans \| Real estate loans \| Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of impaired loans \| SecurityLoan	7
Fair value of impaired loans	$ 13,600,000	$ 3,500,000
Impaired loans \| Commercial and industrial loans \| Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of impaired loans \| SecurityLoan	7
Fair value of impaired loans	$ 13,100,000	$ 1,700,000