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

Investment Securities - Summary of Investment Securities Available for Sale (Detail)

Investment Securities - Summary of Investment Securities Available for Sale (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 849,190	$ 1,061,703
Gross Unrealized Gain	11,038	3,980
Gross Unrealized Loss	2,164	4,966
Estimated Fair Value	858,064us-gaap_AvailableForSaleSecurities	1,060,717us-gaap_AvailableForSaleSecurities	520,990us-gaap_AvailableForSaleSecurities
Collateralized mortgage obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	164,163	188,704
Gross Unrealized Gain	1,719	417
Gross Unrealized Loss	477	1,074
Estimated Fair Value	165,405	188,047
Municipal bonds-tax exempt [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,604	4,319
Gross Unrealized Gain	72	71
Estimated Fair Value	3,676	4,390
Municipal bonds-taxable [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	16,562	16,615
Gross Unrealized Gain	561	398
Gross Unrealized Loss	81	91
Estimated Fair Value	17,042	16,922
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	17,018	17,018
Gross Unrealized Gain	14	2
Gross Unrealized Loss	48	72
Estimated Fair Value	16,984	16,948
Mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	485,112	571,678
Gross Unrealized Gain	8,329	2,811
Gross Unrealized Loss	545	1,203
Estimated Fair Value	492,896	573,286
U.S. government agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	63,967	129,857
Gross Unrealized Gain	12	172
Gross Unrealized Loss	624	1,822
Estimated Fair Value	63,355	128,207
SBA loan pool securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	75,236	109,983
Gross Unrealized Gain	70	52
Gross Unrealized Loss	279	588
Estimated Fair Value	75,027	109,447
U.S treasury securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	162	163
Gross Unrealized Gain	1
Estimated Fair Value	163	163
Other securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	22,916	22,916
Gross Unrealized Gain	260	57
Gross Unrealized Loss	76	80
Estimated Fair Value	23,100	22,893
Equity securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	450	450
Gross Unrealized Loss	34	36
Estimated Fair Value	$ 416	$ 414