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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Loss Contingencies [Line Items]
Total undisbursed loan commitments	$ 394,973		$ 394,973		$ 347,236
Allowance for Loan Off-Balance Sheet Items [Roll Forward]
Balance at beginning of period			31,043
Loan and lease loss provision	100	$ 422	749	$ 342
Balance at end of period	31,818		31,818
Non-PCI Loans and Leases [Member]
Allowance for Loan Off-Balance Sheet Items [Roll Forward]
Balance at beginning of period	31,777	33,152	31,043	32,429
Loan and lease loss provision	100	422	749	342
Balance at end of period	31,818	33,758	31,818	33,758
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	1,323	1,184	1,296	1,184
Loan and lease loss provision	34	(49)	61	(49)
Balance at end of period	1,357	$ 1,135	1,357	$ 1,135
Commitments to extend credit [Member]
Loss Contingencies [Line Items]
Total undisbursed loan commitments	354,894		354,894		318,634
Standby letters of credit [Member]
Loss Contingencies [Line Items]
Total undisbursed loan commitments	24,702		24,702		19,294
Commercial letters of credit [Member]
Loss Contingencies [Line Items]
Total undisbursed loan commitments	$ 15,377		$ 15,377		$ 9,308