Business and Basis of Presentation - Additional Information (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) factor	Dec. 31, 2022 USD ($)	Jan. 01, 2023 USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Historical loss of reversion period, baseline scenario	1 year
Historical loss of reversion period, adverse scenario	2 years
Number of matrix factors | factor	9
Non accrual loan	$ 500,000
Assess nonaccrual loans	500,000
Interest and/or penalties related to income tax matters	0	$ 0
Allowance for credit losses on off-balance sheet commitments			$ 446,000
Decrease to retained earnings	$ (120,855,000)	$ (105,690,000)
Impact
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on off-balance sheet commitments			184,000
Impact | Accounting Standards Update 2016-13
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Accounts receivable, allowance for credit loss			1,900,000
Allowance for credit losses on off-balance sheet commitments			184,000
Deferred tax assets			624,000
Decrease to retained earnings			$ 1,500,000
Minimum | Equipment and Furnishings
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Equipment and furnishings, useful lives	3 years
Maximum | Equipment and Furnishings
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Equipment and furnishings, useful lives	10 years
Open Bank | OP Bancorp
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Percentage of voting equity interests acquired	100.00%