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Subordinated Debentures - Summary of Subordinated Debentures (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) grantor_trust
Subordinated Borrowing [Line Items]
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