Basis of Presentation	6 Months Ended
Basis of Presentation	Jun. 30, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The consolidated financial statements include the accounts of: the Company; its wholly-owned subsidiaries, the Bank and OceanFirst Risk Management, Inc.; the Bank’s direct and indirect wholly-owned subsidiaries, OceanFirst REIT Holdings, Inc., OceanFirst Management Corp., OceanFirst Realty Corp., Casaba Real Estate Holdings Corporation, Country Property Holdings, Inc., OFB Acquisition LLC; Spring Garden Capital Group, LLC (and its subsidiaries), FSB Properties Inc., Flushing Service Corporation, and Flushing Remsen Units, Inc. The Company disposed of its 60% controlling interest in Trident Abstract Title Agency, LLC on October 1, 2025, which was included in the Company’s consolidated financial statements for previous periods. All significant intercompany accounts and transactions have been eliminated in consolidation. The interim consolidated financial statements reflect all normal and recurring adjustments, which are, in the opinion of management, considered necessary for a fair presentation of the financial condition and results of operations for the periods presented. The results of operations for the three and six months ended June 30, 2026 are not necessarily indicative of the results of operations that may be expected for the full year or any other period. In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the statements of financial condition and the results of operations for the periods presented. Actual results could differ from these estimates. Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to the rules and regulations of the SEC. These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025. Segment Reporting The Company’s operations are solely in the financial services industry and provide a range of regional community banking services to retail and commercial customers. The Company operates throughout New Jersey, New York, Long Island, and the major metropolitan areas from Massachusetts through Virginia. Operating segments are defined as components of an entity for which separate financial information is available and is regularly reviewed by the CODM. The CODM makes operating decisions and manages the activities of the business on a consolidated basis. Therefore, management concluded the Company has a single operating segment, and therefore one reportable segment. Further, the CODM allocates resources and assesses performance based on an ongoing review of the Company’s consolidated financial results. Specifically, the CODM reviews net income, reported within the Consolidated Statements of Income, along with information in the Consolidated Statements of Financial Condition, to decide whether to reinvest profits into the Company or other strategic investments. Refer to the Consolidated Statements of Financial Condition and Consolidated Statements of Income for net income and all significant expenses regularly provided to and reviewed by the CODM.