Subordinated Debentures and Convertible Notes - Summary of Trust Preferred Securities and Debentures (Details)	Jun. 30, 2023 USD ($) grantorTrust	Dec. 31, 2022 USD ($)
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 126,000,000
Carrying Value of Subordinated Debentures	$ 107,188,000	$ 106,565,000
Number of wholly owned subsidiary grantor trusts \| grantorTrust	9
Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 126,000,000
Carrying Value of Subordinated Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Subordinated Debentures	$ 107,188,000	$ 106,600,000
Nara Capital Trust III
Subordinated Borrowing [Line Items]
Current Rate	8.702%
Nara Capital Trust III \| Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 5,000,000
Nara Capital Trust III \| Carrying Value of Subordinated Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Subordinated Debentures	$ 5,155,000
Nara Statutory Trust IV
Subordinated Borrowing [Line Items]
Current Rate	8.11%
Nara Statutory Trust IV \| Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 5,000,000
Nara Statutory Trust IV \| Carrying Value of Subordinated Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Subordinated Debentures	$ 5,155,000
Nara Statutory Trust V
Subordinated Borrowing [Line Items]
Current Rate	8.46%
Nara Statutory Trust V \| Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 10,000,000
Nara Statutory Trust V \| Carrying Value of Subordinated Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Subordinated Debentures	$ 10,310,000
Nara Statutory Trust VI
Subordinated Borrowing [Line Items]
Current Rate	7.202%
Nara Statutory Trust VI \| Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 8,000,000
Nara Statutory Trust VI \| Carrying Value of Subordinated Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Subordinated Debentures	$ 8,248,000
Center Capital Trust I
Subordinated Borrowing [Line Items]
Current Rate	8.11%
Center Capital Trust I \| Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 18,000,000
Center Capital Trust I \| Carrying Value of Subordinated Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Subordinated Debentures	$ 15,065,000
Wilshire Trust II
Subordinated Borrowing [Line Items]
Current Rate	7.30%
Wilshire Trust II \| Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 20,000,000
Wilshire Trust II \| Carrying Value of Subordinated Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Subordinated Debentures	$ 16,557,000
Wilshire Trust III
Subordinated Borrowing [Line Items]
Current Rate	6.952%
Wilshire Trust III \| Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 15,000,000
Wilshire Trust III \| Carrying Value of Subordinated Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Subordinated Debentures	$ 11,825,000
Wilshire Trust IV
Subordinated Borrowing [Line Items]
Current Rate	6.932%
Wilshire Trust IV \| Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 25,000,000
Wilshire Trust IV \| Carrying Value of Subordinated Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Subordinated Debentures	$ 19,087,000
Saehan Capital Trust I
Subordinated Borrowing [Line Items]
Current Rate	7.158%
Saehan Capital Trust I \| Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 20,000,000
Saehan Capital Trust I \| Carrying Value of Subordinated Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Subordinated Debentures	$ 15,786,000