Business and Basis of Presentation (Policies)	3 Months Ended
Business and Basis of Presentation (Policies)	Mar. 31, 2022
Accounting Policies [Abstract]
Business and Basis of Presentation	Business and Basis of Presentation OP Bancorp is a California corporation that was formed to acquire 100% of the voting equity of Open Bank (the “Bank”) and commenced operation as a bank holding company on June 1, 2016. This transaction was treated as an internal reorganization as all shareholders of the Bank became shareholders of OP Bancorp. OP Bancorp has no operations other than ownership of the Bank. The Bank is a California state-chartered and FDIC-insured financial institution, which began its operations on June 10, 2005. Headquartered in downtown Los Angeles, California, OP Bancorp operates primarily in the traditional banking business arena that includes accepting deposits and making loans and investments. OP Bancorp’s primary deposit products are demand and time deposits, and the primary lending products are commercial business loans to small to medium sized businesses. OP Bancorp is operating with ten full-service branches. The accompanying unaudited Consolidated Financial Statements and notes thereto of the Company have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”) for Form 10-Q and conform to practices within the banking industry and include all of the information and disclosures required by accounting principles generally accepted in the United States of America (“GAAP”) for interim financial reporting. The accompanying unaudited Consolidated Financial Statements reflect all adjustments (consisting only of normal recurring adjustments), which are necessary for a fair presentation of the financial results for the interim periods presented, including eliminating intercompany transactions and balances. Certain items on the Consolidated Financial Statements and notes for prior years have been reclassified to conform to the 2022 presentation. The results of operations for the interim periods are not necessarily indicative of the results for the full year. These interim unaudited financial statements should be read in conjunction with the audited Consolidated Financial Statements and the notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021 (“2021 Annual Report on Form 10-K”). Descriptions of our significant accounting policies are included in Note 1. Summary of Significant Accounting Policies in the Notes to Consolidated Financial Statements in the 2021 Annual Report on Form 10-K.
Recent Accounting Pronouncements Not Yet Effective	Recent Accounting Pronouncements Not Yet Effective In March 2022, Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("ASU") 2022-02, Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures. ""ASU 2022-02"). ASU 2022-02 eliminates the accounting guidance for troubled debt restructurings in Accounting Standards Codification (“ASC”) Subtopic 310-40, Receivables - Troubled Debt Restructurings by Creditors, while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty. Additionally, ASU 2022-02 requires entities to disclose current-period gross write-offs by year of origination for financing receivables and net investments in leases within the scope of ASC Subtopic 326-20, Financial Instruments - Credit Losses - Measured at Amortized Cost. ASU 2022-02 will be effective on January 1, 2023 though early adoption is permitted. The adoption of ASU 2022-02 is not expected to have a significant impact on our consolidated financial statements.