Hanmi Financial Corporation Annual report pursuant to Section 13 and 15(d)

Share-based Compensation - Summary of Transactions for Non-Vested Stock Options (Detail) - 2007 and 2013 Plan - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Number of Shares, Non-vested options outstanding at beginning of period (shares)	0	9,335	46,340
Number of Shares, Options granted (shares)	0
Number of Shares, Options vested (shares)		(9,335)	(37,005)
Number of Shares, Options forfeited (shares)		0	0
Number of Shares, Non-vested options outstanding at end of period (shares)		0	9,335
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-Average Exercise Price Per Share, Non-vested options outstanding at beginning of period (in USD per share)	$ 0	$ 23.47	$ 22.42
Weighted-Average Exercise Price Per Share, Options vested (in USD per share)		23.47	22.16
Weighted-Average Exercise Price Per Share, Options forfeited (in USD per share)		0	0
Weighted-Average Exercise Price Per Share, Non-vested options outstanding at end of period (in USD per share)		$ 0	$ 23.47