75000 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 75010 - Statement - STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS link:presentationLink link:calculationLink link:definitionLink 75020 - Statement - STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS link:presentationLink link:calculationLink link:definitionLink 75030 - Disclosure - Description of Plan link:presentationLink link:calculationLink link:definitionLink 75040 - Disclosure - Summary Of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 75050 - Disclosure - Rights Upon Plan Termination link:presentationLink link:calculationLink link:definitionLink 75060 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 75070 - Disclosure - Investment Contract with Insurance Company link:presentationLink link:calculationLink link:definitionLink 75080 - Disclosure - Tax Status link:presentationLink link:calculationLink link:definitionLink 75090 - Disclosure - Risks and Uncertainties link:presentationLink link:calculationLink link:definitionLink 75100 - Disclosure - Related Party and Party-In-Interest Transactions link:presentationLink link:calculationLink link:definitionLink 75110 - Disclosure - Subsequent Events link:presentationLink link:calculationLink link:definitionLink 75120 - Disclosure - Schedule of Assets (Held at End of Year) link:presentationLink link:calculationLink link:definitionLink 75130 - Disclosure - Summary Of Significant Accounting PoliciesSummary Of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 75140 - Disclosure - Fair Value Measurements - Summary of Investments Measured at Fair Value (Tables) link:presentationLink link:calculationLink link:definitionLink 75150 - Disclosure - Investment Contract with Insurance Company (Tables) link:presentationLink link:calculationLink link:definitionLink 75160 - Disclosure - Schedule of Assets (Held at End of Year) (Tables) link:presentationLink link:calculationLink link:definitionLink 75170 - Disclosure - Description of Plan - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75180 - Disclosure - Summary Of Significant Accounting Policies - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75190 - Disclosure - Rights Upon Plan Termination - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75200 - Disclosure - Fair Value Measurements - Summary of Investments Measured at Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 75210 - Disclosure - Fair Value Measurements - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75220 - Disclosure - Investment Contract with Insurance Company - Schedule of Fully Benefit-Responsive Group Annuity Contract (Details) link:presentationLink link:calculationLink link:definitionLink 75230 - Disclosure - Investment Contract with Insurance Company - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75240 - Disclosure - Related Party and Party-In-Interest Transactions - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75250 - Disclosure - Schedule of Assets - Schedule of Assets (Held at End of Year) (Details) link:presentationLink link:calculationLink link:definitionLink 75250 - Disclosure - Schedule of Assets - Schedule of Assets (Held at End of Year) (Details) [Default] link:presentationLink link:calculationLink link:definitionLink EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Benefits paid to participants EBP, Receivable [Abstract] Receivables: Fair Value, Inputs, Level 2 [Member] Significant Other Observable Inputs (Level 2) EBP, Related Party and Party-in-Interest Transactions [Line Items] Document Fiscal Period Focus EBP, Employer Contribution, Receivable Employer contribution receivable EBP, Fully Benefit-Responsive Investment Contract [Table] EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Employee benefit plan, forfeited amounts totaled EBP, Tax Status [Abstract] EBP, Forfeited Nonvested Account Employee benefit plan, forfeited non-vested accounts Employee Benefit Plan Participant Loan Maturity Year Employee benefit plan participant loan maturity year. Employee benefit plan, asset held for investment, participant loan, maturity year EBP, Description of Plan [Text Block] Description of Plan Investment, Identifier [Axis] EBP, Description of Plan [Line Items] EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Investment, Fair Value and NAV [Abstract] EBP, Accounting Policy [Line Items] Employee benefit plans, service hours per year Employee Benefit Plans Service Hours Per Year Employee benefit plans, service hours per year. EBP, Schedule of Asset Held for Investment [Table] Employee Benefit Plan Payroll Salary Reduction Deferrals on Participant Percentage Employee benefit plan payroll salary reduction deferrals on participant percentage. Employee benefit plan, Payroll salary reduction deferrals on participant, percentage EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Contribution [Table] EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Employee benefit plan, note receivable from participant, maximum borrowing, amount Employee Benefit Plan, Reserves Against Contract Value for Credit Risk Employee benefit plan, reserves against contract value for credit risk. Reserves against contract value for credit risk Amendment Flag EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Deductions from net assets attributable to: Employee Benefit Plan, Profit Sharing Contribution Amount Employee benefit plan, profit sharing contribution amount. Employee benefit plan, profit sharing contribution amount EBP, Payment to Participant [Policy Text Block] Payment of Benefits Employee Benefit Plan Schedule Of Assets [TextBlock] Employee Benefit Plan Schedule Of Assets. Schedule of Assets (Held at End of Year) EBP, Schedule of Asset Held for Investment [Line Items] Fair Value Hierarchy and NAV [Axis] EBP, Investment, Current Value, Type [Extensible Enumeration] Investment Type [Axis] Document Type Entity Central Index Key EBP, Forfeited Nonvested Account, Decrease from Administrative Expense Employee benefit plan, forfeitures to administrative expenses Peapack-Gladstone Financial Corporation Employee Benefit Plan Peapack Gladstone Financial Corporation [Member] Employee Benefit Plan Peapack Gladstone Financial Corporation Employee Benefit Plan Earnings on Forfeited Amounts Employee benefit plan earnings on forfeited amounts. Employee benefit plan, earnings on forfeited amounts EBP, Investment [Policy Text Block] Investment Valuation and Income Recognition EBP, Accounting Policy [Table] EBP, Basis of Accounting [Policy Text Block] Basis of Accounting Employee Benefit Plan Subsequent Event [LineItems] EBP subsequent event. EBP, Subsequent Event [LineItems] EBP, Description of Plan [Table] Common Stock EBP, Employer, Common Stock [Member] Peapack-Gladstone Financial Corporation Common Stock EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment, Total Interest and dividends EBP, Investment, Number of Shares Number of shares Minimum [Member] Minimum EBP, Related Party and Party-in-Interest Transactions [Text Block] Related Party and Party-In-Interest Transactions EBP, Change in Net Asset Available for Benefit, Increase Total additions Fair Value, Inputs, Level 3 [Member] Significant Unobservable Inputs (Level 3) Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] Employee Benefit Plan Change in Net Asset Available for Benefit, Decrease from Miscellaneous Fees Employee benefit plan change in net asset available for benefit, decrease from miscellaneous fees Miscellaneous fees EBP, Investment Sold, Excluding Plan Interest in Master Trust, Selling Price Sold value EBP, Statement of Net Asset Available for Benefit [Abstract] Employee Benefit Plans Termination Vested Percentage Employee benefit plans termination vested percentage. Termination vested percentage Employee Benefit Plan Concentration of Credit Risk [Policy Text Block] EBP, concentration of credit risk policy. Concentration of Credit Risk Participant contributions EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Contributions: EBP, Participant Contribution, Automatic, Deferral Rate Employee benefit plan, automatic deferral rate contribution EBP, Fully Benefit-Responsive Investment Contract [Text Block] Investment Contract with Insurance Company Employee Benefit Plan Internal Revenue Service Limit Amount Employee benefit plan internal revenue service limit amount. Employee benefit plan, internal revenue service limit amount EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value, Ending Balance EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value, Beginning Balance Investments at fair value (Note 4) Total Fair values Employee Benefit Plan Participant Contribution Automatic Deferral Rate Limit Percentage Employee benefit plan participant contribution automatic deferral rate limit percentage. Employee benefit plan, maximum pre-tax deferral rate EBP, Use of Estimate [Policy Text Block] Estimates Mutual Fund [Member] Mutual Fund Mutual Funds Entity [Domain] EBP, Investment Acquired, Excluding Plan Interest in Master Trust, Cost Purchase value EBP, Summary of Accounting Policy [Text Block] Summary Of Significant Accounting Policies Employee benefit plans, profit sharing contribution, service period Employee Benefit Plans Profit Sharing Contribution Service Period Employee benefit plans profit sharing contribution service period. EBP, Investment, Fair Value and NAV [Text Block] Fair Value Measurements EBP, Description of Plan and Accounting Change [Abstract] Plan participant loans EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution EBP, Statement of Change in Net Asset Available for Benefit [Line Items] Statistical Measurement [Domain] EBP, Note Receivable from Participant Notes receivable from participants Document Period End Date EBP, Risk and Uncertainty [Table] Fair Value Hierarchy and NAV [Domain] EBP, Contribution [Abstract] EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Employee benefit plan, note receivable from participant, account, maximum borrowing, percentage EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Plan Termination [Text Block] Rights Upon Plan Termination EBP, Subsequent Event [Text Block] SUBSEQUENT EVENTS Subsequent Events Cover [Abstract] Investments [Domain] EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Investment income: EBP, Risk and Uncertainty [Abstract] EBP, Net Asset Available for Benefit NET ASSETS AVAILABLE FOR BENEFITS Net assets available for benefits, beginning of year Net assets available for benefits, end of year EBP, Fully Benefit-Responsive Investment Contract, Termination, Description Fully benefit-responsive group annuity contract, termination description Summary of Investments Measured at Fair Value EBP, Investment, Fair Value and NAV [Table Text Block] EBP 002 [Member] EBP 002. EBP 002 EBP, Contribution [Line Items] EBP, Fully Benefit-Responsive Investment Contract, Description Fully benefit-responsive group annuity contract, description EBP, Schedule of Asset Held for Investment [Abstract] EBP, Excess Contribution Payable Additional contributions payable Employee Benefit Plan Subsequent Event [Abstract] EBP, subsequent event. EBP, Subsequent Event [Abstract] EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Employee benefit plan, investment, Current Value EBP, Note Receivable from Participant [Policy Text Block] Notes Receivable from Participants EBP, Schedule of Asset Held for Investment [Table Text Block] Schedule of Assets (Held at End of Year) EBP, Fully Benefit-Responsive Investment Contract [Table Text Block] Schedule of Fully Benefit-Responsive Group Annuity Contract EBP, Fully Benefit-Responsive Investment Contract [Abstract] EBP, Statement of Net Asset Available for Benefit [Table] Document Fiscal Year Focus Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment, Total EBP, Employer Contribution, Participant Compensation Matched, Percentage Employee benefit plan, participant contribute percentage EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Asset Total assets EBP, Contribution [Policy Text Block] Contribution Receivable Employee Benefit Plan, Percentage of Crediting Interest Rate of Contract Employee benefit plan, percentage of crediting interest rate of contract. Percentage of crediting interest rate of contract Employee Benefit Plan Participant Maximum Catch Up Contribution Amount Employee benefit plan participant maximum catch up contribution amount. Employee benefit plan, participant maximum catch up contribution amount EBP, Fully Benefit-Responsive Investment Contract [Line Items] EBP, Plan Number Employee Benefit Plan, Plan Number EBP, Investment, Fair Value and NAV [Line Items] Employee Benefit Plan, Vesting Percentage Employee benefit plan, vesting percentage. Employee benefit plans, vesting percentage Legal Entity [Axis] EBP, Risk and Uncertainty [Line Items] EBP, Asset [Abstract] ASSETS EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment Total income Employee Benefit Plan, Employer Matching Contribution Amount Employee benefit plan, employer matching contribution amount. Employee benefit plan, matching contribution amount Employee Benefit Plan Contribution Receivable EBP, contribution receivable. Employee benefit plan, contribution receivable EBP, Investment, Fair Value and NAV [Table] EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Employee rollovers Employee Benefit Plan, Percentage of Investments Invested in Common Stock EBP, Percentage of investments invested in common stock. Employee benefit plan, percentage of investments invested in common stock EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Employee benefit plan, number of years of continuous service in vesting of employee contribution. Employee Benefit Plan Number of Years of Continuous Service in Vesting of Employee Contribution Employee benefit plan number of years of continuous service in vesting of employee contribution. EBP, Asset Held for Investment Total investments Total investments EBP, Tax Status [Text Block] Tax Status Maximum [Member] Maximum Statistical Measurement [Axis] EBP, Statement of Change in Net Asset Available for Benefit [Abstract] EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment Dividend income Entity Registrant Name EBP, Receivable Total receivables EBP, Asset Held for Investment, Participant Loan, Interest Rate Employee benefit plan, asset held for investment, participant loan, interest rate Employee Benefit Plan, Impairments with Respect to Termination of Contracts Employee benefit plan, impairments with respect to termination of contracts. Impairments with respect to termination of contract Employer contributions EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Employee Benefit Plan Participant Contribution Annual Automatic Increase in Deferral Rate Employee benefit plan participant contribution annual automatic increase in deferral rate. Employee benefit plan, annual automatic increase in deferral rate Employee Benefit Plan Subsequent Event [Table] EBP, subsequent event table. EBP, Subsequent Event [Table] EBP, Related Party and Party-in-Interest [Domain] Fair Value Inputs Level 1and Level 2 [Member] Fair value inputs level 1and level 2. Level 1 and Level 2 EBP, Related Party and Party-in-Interest [Axis] EBP, Risk and Uncertainty [Text Block] Risks and Uncertainties EBP, Change in Net Asset Available for Benefit, Decrease Total deductions Employee Benefit Plan Fair Value of Investments Significant Transfers Between Level One and Level Two EBP, fair value of investments significant transfers between level one and level two. Fair value of investments significant transfers between level 1 and level 2 Quoted Prices In Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Employee Benefit Plan Employee Qualified Non Elective Contribution Employee benefit plan employee qualified non elective contribution. Employee benefit plan, employee Qualified Non Elective contribution EBP, Tax Status [Line Items] Entity Tax Identification Number EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Net increase in net assets available for benefits EBP, Tax Status [Table] EBP, Investment, Excluding Plan Interest in Master Trust, Contract Value Investment at contract value (Note 5) Traditional Investment Contract EBP, Asset Held for Investment, Party-in-Interest [true false] Putnam Large Cap Value R6. Fidelity Freedom Blend 2070 K. Pimco Income Fund Institutional [Member] Victory Sycamore Established Value R6. Fidelity Freedom Blend 2020 K [Member] Vanguard FTSE World Index Admiral [Member] Fidelity Freedom Blend 2040 K [Member] Putnam Large Cap Value R6 [Member] Janus Henderson Balanced Fund N. Fidelity Freedom Blend 2035 K. Vanguard Intermediate Term [Member] Vanguard FTSE Social Index Admiral [Member] Fidelity Freedom Blend 2045 K [Member] Vanguard Short Term Bond Index Admiral. Vanguard Small Cap Index Admiral. Fidelity Freedom Blend 2025 K. Fidelity Freedom Blend 2065 K [Member] Vanguard FTSE World Index Admiral. Guaranteed Income Fund Agreement No: GA-39867. Fidelity Freedom Blend 2035 K [Member] Fidelity Freedom Blend 2060 K [Member] Vanguard Small Cap Index Admiral [Member] Victory Sycamore Established Value R6 [Member] Fidelity Government Money Market K6 [Member] MFS International Diversification R6 [Member] Vanguard Short Term Bond Index Admiral [Member] Fidelity Freedom Blend Income K. Fidelity Freedom Blend 2060 K. Vanguard FTSE Social Index Admiral. Fidelity 500 Index Fund [Member] Janus Henderson Balanced Fund N [Member] Fidelity Freedom Blend Income K [Member] Fidelity Mid-Cap Index Fund [Member] Fidelity Freedom Blend 2015 K [Member] JP Morgan Mid Cap Growth R6 [Member] Fidelity Total Bond K6 [Member] JP Morgan Large-Cap Growth R6. Fidelity Freedom Blend 2015 K. Fidelity Freedom Blend 2045 K [Member] Fidelity Freedom Blend 2025 K [Member] Fidelity Freedom Blend 2050 K [Member] Fidelity Mid-Cap Index Fund. Guaranteed Income Fund Agreement No: GA-39867 [Member] Gabelli Small Cap Growth [Member] MFS International Diversification R6. Fidelity Freedom Blend 2055 K [Member] Fidelity Freedom Blend 2040 K. Fidelity Freedom Blend 2070 K [Member] Fidelity Freedom Blend 2010 K [Member] Fidelity Government Money Market K6. Pimco Income Fund Institutional. Fidelity Freedom Blend 2065 K [Member] Fidelity Total Bond K6. Fidelity 500 Index Fund. JP Morgan Large Cap Growth R6 [Member] JP Morgan Mid Cap Growth R6. Fidelity Freedom Blend 2010 K. Fidelity Freedom Blend 2030 K. Fidelity Freedom Blend 2020 K [Member] Vanguard Intermediate Term. Fidelity Freedom Blend 2030 K [Member] Fidelity Freedom Blend 2055 K. Gabelli Small-Cap Growth. Fidelity Freedom Blend 2050 K.