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

Off-Balance Sheet Commitments - Distribution of Undisbursed Loan Commitments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Loss Contingencies [Line Items]
Total undisbursed loan commitments	$ 358,376		$ 347,236
Allowance for Loan Off-Balance Sheet Items [Roll Forward]
Balance at beginning of period	31,043
Loan and lease loss provision (income)	649	$ (80)
Balance at end of period	31,777
Non-PCI Loans and Leases [Member]
Allowance for Loan Off-Balance Sheet Items [Roll Forward]
Balance at beginning of period	31,043	32,429
Loan and lease loss provision (income)	649	(80)
Balance at end of period	31,777	33,152
Allowance for off-balance sheet items [Member] \| Non-PCI Loans and Leases [Member]
Allowance for Loan Off-Balance Sheet Items [Roll Forward]
Balance at beginning of period	1,296	1,184
Loan and lease loss provision (income)	27	0
Balance at end of period	1,323	$ 1,184
Commitments to extend credit [Member]
Loss Contingencies [Line Items]
Total undisbursed loan commitments	324,528		318,634
Standby letters of credit [Member]
Loss Contingencies [Line Items]
Total undisbursed loan commitments	22,288		19,294
Commercial letters of credit [Member]
Loss Contingencies [Line Items]
Total undisbursed loan commitments	$ 11,560		$ 9,308