Subordinated Debentures - Summary of Subordinated Debentures (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) grantor_trust	Dec. 31, 2018 USD ($)
Subordinated Borrowing [Line Items]
Carrying value of Debentures	$ 103,035	$ 101,929
Right to defer consecutive payments of interest, maximum term	5 years
Other assets
Subordinated Borrowing [Line Items]
Investment in common trust securities	$ 3,900
Hope Bancorp Grantor Trust [Member]
Subordinated Borrowing [Line Items]
Number of grantor trusts issuing securities | grantor_trust	9
Trust Preferred Securities Subject to Mandatory Redemption
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 126,000
Percent included in tier one capital, maximum	25.00%
Excess of percent threshold included in tier two capital	25.00%
Trust Preferred Securities Subject to Mandatory Redemption | Hope Bancorp Grantor Trust [Member]
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 126,000
Subordinated Debentures Amount
Subordinated Borrowing [Line Items]
Carrying value of Debentures	103,035	101,900
Remaining discounts of acquired Debentures	$ 26,900	$ 28,000