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

Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 866,204	$ 749,458
Gross Unrealized Gain	589	4,729
Gross Unrealized Loss	(4,674)	(406)
Estimated Fair Value	862,119	753,781
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,000	9,997
Gross Unrealized Gain	10	135
Estimated Fair Value	10,010	10,132
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	614,310	515,169
Gross Unrealized Gain	320	4,260
Gross Unrealized Loss	(3,427)	(188)
Estimated Fair Value	611,203	519,241
Collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	101,576	133,632
Gross Unrealized Gain	255	186
Gross Unrealized Loss	(380)	(217)
Estimated Fair Value	101,451	133,601
Debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	87,477	90,660
Gross Unrealized Gain	4	148
Gross Unrealized Loss	(416)	(1)
Estimated Fair Value	87,065	90,807
Total U.S. government agency and sponsored agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	803,363	739,461
Gross Unrealized Gain	579	4,594
Gross Unrealized Loss	(4,223)	(406)
Estimated Fair Value	799,719	$ 743,649
Municipal bonds-tax exempt
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	52,841
Gross Unrealized Loss	(451)
Estimated Fair Value	$ 52,390