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, 2019	Mar. 31, 2018	Dec. 31, 2018
Loss Contingencies [Line Items]
Total undisbursed loan commitments	$ 312,568		$ 371,448
Allowance for Loan Off-Balance Sheet Items [Roll Forward]
Balance at beginning of period	31,974
(Income) provision	1,117	$ 649
Balance at end of period	32,896
Non-PCI Loans and Leases
Allowance for Loan Off-Balance Sheet Items [Roll Forward]
Balance at beginning of period	31,974	31,043
(Income) provision	1,117	649
Balance at end of period	32,896	31,777
Allowance for off-balance sheet items \| Non-PCI Loans and Leases
Allowance for Loan Off-Balance Sheet Items [Roll Forward]
Balance at beginning of period	1,439	1,296
(Income) provision	(339)	27
Balance at end of period	1,100	$ 1,323
Commitments to extend credit
Loss Contingencies [Line Items]
Total undisbursed loan commitments	270,051		325,100
Standby letters of credit
Loss Contingencies [Line Items]
Total undisbursed loan commitments	30,597		32,500
Commercial letters of credit
Loss Contingencies [Line Items]
Total undisbursed loan commitments	$ 11,920		$ 13,848