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

Accumulated Other Comprehensive Income - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jan. 01, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income [Line Items]
Net gain (loss) on sales of securities		$ 19	$ 267	$ (341)	$ 1,473
Net unrealized gains (losses) recorded in comprehensive income		21	227	116	971
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income [Line Items]
Reduction of unrealized losses related to securities	$ 529			529
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income [Line Items]
Adjustment to accumulated other comprehensive income related to adoption of ASU 2016-01 and 2018-02, net of tax	17			17
Tax Expense Benefit [Member]
Accumulated Other Comprehensive Income [Line Items]
Reduction in tax benefits upon adoption of ASUs	$ 546			546
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income [Line Items]
Net gain (loss) on sales of securities		$ 19	$ 267	$ 87	$ 1,500