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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Loss Contingencies [Line Items]
Total undisbursed loan commitments	$ 398,949		$ 398,949		$ 347,236
Allowance for Loan Off-Balance Sheet Items [Roll Forward]
Balance at beginning of period			31,043
Loan and lease loss provision	200	$ 269	949	$ 611
Balance at end of period	31,676		31,676
Non-PCI Loans and Leases [Member]
Allowance for Loan Off-Balance Sheet Items [Roll Forward]
Balance at beginning of period	31,818	33,758	31,043	32,429
Loan and lease loss provision	200	268	949	610
Balance at end of period	31,676	32,492	31,676	32,492
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	1,357	1,135	1,296	1,184
Loan and lease loss provision	0	(220)	61	(269)
Balance at end of period	1,357	$ 915	1,357	$ 915
Commitments to extend credit [Member]
Loss Contingencies [Line Items]
Total undisbursed loan commitments	358,570		358,570		318,634
Standby letters of credit [Member]
Loss Contingencies [Line Items]
Total undisbursed loan commitments	29,404		29,404		19,294
Commercial letters of credit [Member]
Loss Contingencies [Line Items]
Total undisbursed loan commitments	$ 10,975		$ 10,975		$ 9,308