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

Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 624,112	$ 583,444
Gross Unrealized Gain	1,925	401
Gross Unrealized Loss	4,567	8,937
Estimated Fair Value	621,470	574,908
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	54,584	39,768
Gross Unrealized Gain	148	69
Gross Unrealized Loss	4	7
Estimated Fair Value	54,728	39,830
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	356,973	300,957
Gross Unrealized Gain	566	61
Gross Unrealized Loss	2,938	5,984
Estimated Fair Value	354,601	295,034
Collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	153,286	124,550
Gross Unrealized Gain	298	74
Gross Unrealized Loss	1,557	2,332
Estimated Fair Value	152,027	122,292
Debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	17,472	7,499
Gross Unrealized Gain	74	0
Gross Unrealized Loss	53	97
Estimated Fair Value	17,493	7,402
Total U.S. government agency and sponsored agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	527,731	433,006
Gross Unrealized Gain	938	135
Gross Unrealized Loss	4,548	8,413
Estimated Fair Value	524,121	424,728
Municipal bonds-tax exempt
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	41,797	110,670
Gross Unrealized Gain	839	197
Gross Unrealized Loss	15	517
Estimated Fair Value	$ 42,621	$ 110,350