Business and Basis of Presentation	3 Months Ended
Business and Basis of Presentation	Mar. 31, 2025
Accounting Policies [Abstract]
Business and Basis of Presentation	Business and Basis of Presentation OP Bancorp ("Company") is a California corporation and the registered bank holding company for Open Bank (“Bank”). The Company commenced operation as a bank holding company on June 1, 2016, and substantially all of its assets, operations and business are owned and conducted through the Bank. The Bank is a California state-chartered and Federal Deposit Insurance Corporation ("FDIC")-insured financial institution, which began its operations on June 10, 2005. Headquartered in downtown Los Angeles, California, Open Bank operates primarily in the traditional banking business arena that includes accepting deposits and making loans and investments. Open Bank'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 eleven full-service branches located in California, Washington, Nevada and Texas, and five loan production offices located in California, Georgia, Washington, Colorado, and Virginia. The accompanying unaudited consolidated financial statements and notes thereto of the Company have been prepared by management 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 in our consolidated financial statements and notes for prior years have been reclassified to conform to the current 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 consolidated financial statements and the notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 (“2024 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 2024 Annual Report on Form 10-K. Recently Issued Accounting Pronouncement under Evaluation In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. This ASU amends the disclosure requirements for income taxes, including the requirement for further disaggregation of the income tax rate reconciliation and income taxes paid disclosures. The amendments in this guidance must be applied prospectively, with the option to apply retrospectively. This guidance is effective for fiscal years beginning after December 15, 2024. The Company is currently evaluating the impact of this new standard on its consolidated financial statements, and the adoption is not expected to have a significant impact on the consolidated financial statements. In November 2024, the FASB issued ASU No. 2024-03, Disaggregation of Income Statement Expenses (DISE). The ASU requires additional disclosure of about specific types of expenses included in the income statement. This guidance applies to all public business entities and is effective for annual reporting periods beginning after December 15, 2026 and interim reporting periods within annual reporting periods beginning after December 15, 2027. The requirements will be applied prospectively with the option for retrospective application. The Company is currently evaluating the impact of this new standard on its consolidated financial statements, and the adoption is not expected to have a significant impact on the consolidated financial statements.