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Allowance for loan credit losses Allowance for loan credit losses Balance at beginning of period Balance at end of period Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Document Period End Date Document Period End Date Provision for income taxes Business Combination, Acquiree's Income Tax Expense (Benefit) Since Acquisition Date, Actual Business Combination, Acquiree's Income Tax Expense (Benefit) Since Acquisition Date, Actual 2028 Lessee, Operating Lease, Liability, to be Paid, Year Two Minimum range of unobservable inputs Fair Value, Measurement with Unobservable Inputs Reconciliation Percentage Minimum Fair value, measurement with unobservable inputs reconciliation percentage minimum. 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Compensation Total interest income Interest and Dividend Income, Operating Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Commercial loan swap income Gain (Loss) on Hedging Activity Redemption of preferred stock Payments for Repurchase of Preferred Stock and Preference Stock Decrease in other assets Increase (Decrease) in Other Operating Assets (Decrease) increase in deposits Increase (Decrease) in Deposits Less: Unallocated common stock held by ESOP Common Stock Issued, Employee Trust, Deferred Measurement Basis [Axis] Measurement Basis [Axis] Loans and loans held-for-sale Business Combination, Recognized Liability Assumed, Loans And Loans Held-for-Sale Business Combination, Recognized Liability Assumed, Loans And Loans Held-for-Sale Less than one year Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Proceeds from sale of loans Proceeds from Sale of Finance Receivables Deposits Business Combination, Recognized Liability Assumed, Deposits Business Combination, Recognized Liability Assumed, Deposits Current period gross charge-offs, Revolving lines of credit Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff Cash and cash equivalents Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Net unrealized gain (loss) on debt securities (net of tax expense of $484 and tax benefit of $304 in 2026 and tax expense of $542 and $1,330 in 2025, respectively) OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Total excluding fair value hedge basis adjustment, estimated fair value Debt Securities, Available-For-Sale, Excluding Accrued Interest, Before Fair Value Hedge Cumulative Increase (Decrease) Debt Securities, Available-For-Sale, Excluding Accrued Interest, Before Fair Value Hedge Cumulative Increase (Decrease) Gain (losses) in fair value adjustments Derivative, Credit Risk Valuation Adjustments, Derivative Liabilities Derivative, Credit Risk Valuation Adjustments, Derivative Liabilities Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Current Reporting Status Entity Current Reporting Status Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Unrealized loss on cash flow derivative hedges, tax benefit Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax Cash Flow Hedging Cash Flow Hedging [Member] Financial Liabilities: Liabilities, Fair Value Disclosure [Abstract] Net increase in loans receivable Net (Increase) Decrease In Loan Receivable Net (Increase) Decrease In Loan Receivable Amortized cost Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss Schedule of Business Acquisition, Pro Forma Information Business Combination, Pro Forma Information [Table Text Block] Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Interest rate swaps and cap contracts Interest Rate Swap And Cap [Member] Interest Rate Swap And Cap Held-to-maturity, 12 months or longer, Unrealized Losses Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Commercial and industrial – non-real estate Total commercial and industrial - non-real estate Commercial and industrial - non-real estate Commercial And Industrial Non-Real Estate [Member] Commercial And Industrial Non-Real Estate Number of properties operated by acquiree Business Combination, Number Of Properties Operated By Acquiree Business Combination, Number Of Properties Operated By Acquiree Equity investments and other Other Interest and Dividend Income Financial Instruments [Domain] Financial Instruments [Domain] Four years before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year Interest rate derivative asset Derivative Asset Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Underlying Securities Award Underlying Securities Amount Less: comprehensive income (loss) attributable to non-controlling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Net proceeds from capital raise Stock Issued During Period, Value, New Issues Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Combination of Term Extension and Interest Rate Reduction Extended Maturity and Interest Rate Reduction [Member] Preferred Stock Preferred Stock [Member] Operating leases Operating Lease, Weighted Average Discount Rate, Percent Non-credit discount on acquired loans Financing Receivable, Purchased Seasonsed Loans, Discount (Premium) Financing Receivable, Purchased Seasonsed Loans, Discount (Premium) Modified loans Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount Provision for credit losses Provision for credit losses Provision for Loan, Lease, and Other Losses Time deposits, $250,000 and over Time Deposits, at or Above FDIC Insurance Limit Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Continuing Operation [Abstract] Schedule of Lease Expenses and Other Lease Information Lease, Cost [Table Text Block] All Trading Arrangements All Trading Arrangements [Member] Available-for-sale, Less than 12 months, Estimated Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Schedule of Financial Assets and Financial Liabilities Measured at Fair Value Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Current Fiscal Year End Date Current Fiscal Year End Date Schedule of Amortized Cost of Debt Securities HTM, Aggregated by Credit Quality Indicator Debt Securities, Held-to-Maturity, Credit Quality Indicator [Table Text Block] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Provision (benefit) for credit losses Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) Derivative [Line Items] Derivative [Line Items] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Cash dividend per share (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Net interest income Business Combination, Pro Forma Information, Pro Forma Net Interest Income Business Combination, Pro Forma Information, Pro Forma Net Interest Income Increase in short-term borrowings Proceeds from (Repayments of) Short-Term Debt Stock compensation Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Schedule of Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Commitments to lend additional funds to borrowers Financing Receivable Commitments To Lend Additional Funds On Non Accrual Loans Financing Receivable Commitments To Lend Additional Funds On Non Accrual Loans Proceeds from bank owned life insurance Proceeds from Life Insurance Policy Distributions to non-controlling interest Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Measure: Measure [Axis] Treasury stock, shares (in shares) Treasury Stock, Common, Shares Total comprehensive (loss) income available to common stockholders Comprehensive Income (Loss) Available For Common Stockholders Comprehensive Income (Loss) Available For Common Stockholders Total adjustments Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity Equity Components [Axis] Equity Components [Axis] Other operating expenses Other Cost and Expense, Operating Net residential loans originated for sale Proceeds From (Payment For) Origination, Loan, Mortgage, Held-For-Sale Proceeds From (Payment For) Origination, Loan, Mortgage, Held-For-Sale Entity Interactive Data Current Entity Interactive Data Current Net income (loss) attributable to non-controlling interest Net Income (Loss) Attributable to Noncontrolling Interest Due after one year through five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Estimated Fair Value Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] Securities Business Combination, Recognized Asset Acquired, Securities Business Combination, Recognized Asset Acquired, Securities Entity Small Business Entity Small Business Comprehensive (loss) income attributable to OceanFirst Financial Corp. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Net interest income Interest Income (Expense), Operating MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] 2029 Finance Lease, Liability, to be Paid, Year Three Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Continuing Operation [Abstract] Document Type Document Type Loans measured for impairment based on the fair value of the underlying collateral Loans, Measured For Impairment, Fair Vale Disclosure Loans, Measured For Impairment, Fair Vale Disclosure Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Allowance for Securities Credit Losses Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest Principal repayments on debt securities HTM Principal Repayments On Debt Investment Securities Held-To-Maturity Principal Repayments On Debt Investment Securities Held-To-Maturity Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Non-interest income Business Combination, Pro Forma Information, Pro Forma Noninterest Income Business Combination, Pro Forma Information, Pro Forma Noninterest Income Business Combination, Carrying Value [Axis] Business Combination, Carrying Value [Axis] Business Combination, Carrying Value Pledged Status [Domain] Pledged Status [Domain] (Loss) Income before provision for income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Warrants and rights outstanding, term Warrants and Rights Outstanding, Term Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Executive Category: Executive Category [Axis] Credit loss expense Business Combination, Pro Forma Information, Pro Forma Provision For Credit Loss Expense Business Combination, Pro Forma Information, Pro Forma Provision For Credit Loss Expense Counterparty Name [Axis] Counterparty Name [Axis] Liabilities and Stockholders’ Equity Liabilities and Equity [Abstract] Par value of loans at acquisition Financing Receivable, Purchased Seasonsed Loans, Amount At Par Value Financing Receivable, Purchased Seasonsed Loans, Amount At Par Value Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Net gain on sales of loans Gain (Loss) on Sales of Loans, Net Supplemental Disclosure of Cash Flow Information: Supplemental Cash Flow Information [Abstract] PEO Name PEO Name Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Held-to-maturity, 12 months or longer, Estimated Fair Value Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value Income taxes Income Tax Paid, before Refund Received Cash received, net of cash consideration paid for acquisition Cash Acquired from Acquisition Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Cash and due from banks Cash and due from banks at beginning of period Cash and due from banks at end of period Cash and Due from Banks Schedule of Aging of Recorded Investment in Past Due Loans by Loan Portfolio Segment Financing Receivable, Past Due [Table Text Block] Loans Not Past Due Current Financial Asset, Not Past Due [Member] Assets acquired: Business Combination, Recognized Asset Acquired, Asset [Abstract] Estimated Fair Value Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill [Abstract] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Income from bank owned life insurance Bank Owned Life Insurance Income Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Total comprehensive (loss) income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Measurement Frequency [Domain] Measurement Frequency [Domain] Stock compensation Share-Based Payment Arrangement, Noncash Expense Interest expense: Interest Expense, Operating and Nonoperating [Abstract] Net interest income Business Combination, Acquiree's Net Interest Income Since Acquisition Date, Actual Business Combination, Acquiree's Net Interest Income Since Acquisition Date, Actual Compensation and employee benefits Labor and Related Expense Total Lease, Cost Proceeds from maturities and calls of debt securities HTM Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities Basic (loss) earnings per share (in dollars per share) Earnings Per Share, Basic Measurement Input Type [Axis] Measurement Input Type [Axis] Loss on redemption of preferred stock Preferred Stock Redemption (Gain) Loss, Net Preferred Stock Redemption (Gain) Loss, Net Purchase Accounting Adjustments, Cash and cash equivalents Business Combination, Provisional Information, Initial Accounting Incomplete Adjustment, Cash And Cash Equivalents Business Combination, Provisional Information, Initial Accounting Incomplete Adjustment, Cash And Cash Equivalents Insider Trading Arrangements [Line Items] Core deposit intangible Bank Owned Life Insurance Non-Voting Common-Equivalent Stock Nonvoting Common Equivalent Stock [Member] Nonvoting Common Equivalent Stock Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Total excluding fair value hedge basis adjustment, amortized cost Debt Securities, Available-For-Sale, Amortized Cost, Excluding Accrued Interest, Before Allowance For Credit Loss And Fair Value Hedge Cumulative Increase (Decrease) Debt Securities, Available-For-Sale, Amortized Cost, Excluding Accrued Interest, Before Allowance For Credit Loss And Fair Value Hedge Cumulative Increase (Decrease) Weighted-Average Remaining Lease Term Weighted Average Remaining Lease Term [Abstract] Weighted Average Remaining Lease Term Other borrowings Other borrowings Other Borrowings Fair Value Measurement [Domain] Fair Value Measurement [Domain] Recoveries Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Goodwill and other intangible assets, net Noncash or Part Noncash Acquisition, Intangible Assets Acquired Gross charge-off originated in year two Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff FHLB advances and other borrowings Business Combination, Recognized Liability Assumed, Federal Home Loan Bank, Advances And Other Borrowings Business Combination, Recognized Liability Assumed, Federal Home Loan Bank, Advances And Other Borrowings Equity Awards Adjustments Equity Awards Adjustments [Member] Fair value hedge basis adjustment, gross unrealized losses Hedged Asset, Fair Value Hedge, Portfolio Layer Method, Hedged Layer, Accumulated Gross Unrealized Loss, Before Tax, Cumulative Increase (Decrease) Hedged Asset, Fair Value Hedge, Portfolio Layer Method, Hedged Layer, Accumulated Gross Unrealized Loss, Before Tax, Cumulative Increase (Decrease) Hedging Relationship [Domain] Hedging Relationship [Domain] Purchase Accounting Adjustments, Core deposit intangible Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles Decrease in other liabilities Increase (Decrease) in Other Operating Liabilities Pass Pass [Member] Schedule of Loans Receivable, Net Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Debt securities Interest Income, Debt Securities, Operating Fair value hedge basis adjustment Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) Warburg Warrant NVCE stock warrants Warburg Warrant [Member] Warburg Warrant Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Agency commercial Commercial Mortgage-Backed Securities [Member] Hedging Designation [Domain] Hedging Designation [Domain] Class of Stock [Domain] Class of Stock [Domain] Operating cash flows from finance leases Finance Lease, Interest Payment on Liability Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Benefit for credit losses Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Credit Loss Expense (Reversal) Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Business Combination, Consideration Transferred, Equity Interest, Type [Domain] Business Combination, Consideration Transferred, Equity Interest, Type [Domain] Schedule of Allowance for Credit Losses for HTM Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Table Text Block] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Total consideration paid Total Purchase Price: Business Combination, Consideration Transferred Entity Filer Category Entity Filer Category Available-for-sale, Total, Estimated Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position Deposits Noncash Or Part Noncash Acquisition, Deposits Assumed Noncash Or Part Noncash Acquisition, Deposits Assumed Basis of Presentation Basis of Accounting [Text Block] Finance Lease Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Financial Asset, Period Past Due [Axis] Financial Asset, Aging [Axis] Derivatives Not Designated as Hedging Instruments Not Designated as Hedging Instrument [Member] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Deposits other than time deposits Deposits Other Than Time Deposits Fair Value Disclosure Deposits Other Than Time Deposits Fair Value Disclosure Schedule of Realized and Unrealized Gains or Losses on Equity Securities Gain (Loss) on Securities [Table Text Block] Other liabilities Noncash or Part Noncash Acquisition, Other Liabilities Assumed Net (loss) income Net (loss) income Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Warrant mandatory exercise by counterparty, trigger stock price per share (in dollars per share) Class Of Warrant Or Right, Mandatory Exercise By Counterparty, Trigger Stock Price Per Share Class Of Warrant Or Right, Mandatory Exercise By Counterparty, Trigger Stock Price Per Share Purchase price per share (in dollars per share) Business Combination, Price Per Share Derivative liability Derivative Liability Entity Address, Address Line One Entity Address, Address Line One Provision for income taxes Income Tax Expense (Benefit) Fair Value Hedging Fair Value Hedging [Member] Acquired finite-lived intangible assets, useful life Intangible Asset, Finite-Lived, Acquired, Useful Life Intangible Asset, Finite-Lived, Acquired, Useful Life Initial allowance for credit losses on acquired loans Financing Receivable, Purchased Seasonsed Loans, Allowance For Credit Loss At Acquisition Date Financing Receivable, Purchased Seasonsed Loans, Allowance For Credit Loss At Acquisition Date Consolidation Consolidation, Policy [Policy Text Block] Gross charge-offs Charge-offs Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Loans receivable, net of allowance for loans credit losses Business Combination, Recognized Asset Acquired, Loans Receivable, Net Of Allowance For Credit Loss Business Combination, Recognized Asset Acquired, Loans Receivable, Net Of Allowance For Credit Loss Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] Warrant voluntary exercise by counterparty, trigger stock price per share (in dollars per share) Class Of Warrant Or Right, Voluntary Exercise By Counterparty, Trigger Stock Price Per Share Class Of Warrant Or Right, Voluntary Exercise By Counterparty, Trigger Stock Price Per Share Employee Stock Ownership Plan (ESOP), Plan [Domain] Employee Stock Ownership Plan (ESOP), Plan [Domain] Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Statement [Table] Statement [Table] Non-interest income Business Combination, Acquiree's Noninterest Income Since Acquisition Date, Actual Business Combination, Acquiree's Noninterest Income Since Acquisition Date, Actual Exercise of stock options Proceeds from Stock Options Exercised Derivative term Derivative, Contract Term One year before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year Schedule of Recorded Investment in Non-Accrual Loans, by Loan Portfolio Segment Financing Receivable, Nonaccrual [Table Text Block] Loans held-for-sale, sold Financing Receivable, Held-For-Sale, Sold Financing Receivable, Held-For-Sale, Sold Allowance for securities credit losses Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] Incentive awards Share-Based Payment Arrangement [Member] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract]