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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 31, 2020 shares | Mar. 31, 2024 USD ($) Segment $ / shares shares | Mar. 31, 2023 USD ($) shares | Dec. 31, 2026 shares | Dec. 31, 2025 shares | Apr. 30, 2024 shares | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jan. 01, 2022 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Net increase to retained earnings | $ |  | $ 401,838,000 |  |  |  |  | $ 394,094,000 |  |
Reduction to allowance for credit losses | $ |  | $ (699,000) | $ (801,000) |  |  |  | (687,000) | $ (752,000) |
Number of operating segments | Segment |  | 2 |  |  |  |  |  |  |
Federal funds sales periods |  | 1 day |  |  |  |  |  |  |
Interest-earning deposits maturities period |  | 1 year |  |  |  |  |  |  |
Servicing rights | $ |  | $ 0 |  |  |  |  |  |  |
Amount of loans serviced | $ |  | $ 159,200,000 |  |  |  |  | 162,900,000 |  |
Threshold period for loan |  | 30 days |  |  |  |  |  |  |
Threshold for determining nonaccrual status |  | 90 days |  |  |  |  |  |  |
Closing stock price of common stock | $ / shares |  | $ 24.33 |  |  |  |  |  |  |
Stock options granted |  | 0 |  |  |  |  |  |  |
Unrecognized compensation cost | $ |  | $ 0 |  |  |  |  |  |  |
Issuance of shares for Employee Stock Purchase Plan, shares |  | 11,145 | 7,533 |  |  |  |  |  |
Antidilutive securities |  | 191,016 | 362,052 |  |  |  |  |  |
Phantom Plan |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Stock options granted |  | 237,811 |  |  |  |  |  |  |
2024 ESPP | Subsequent Event |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Number of share purchase rights authorized |  |  |  |  |  | 150,000 |  |  |
Restricted stock [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Settled in cash |  | 95,024 |  |  |  |  |  |  |
Shares granted |  | 0 |  |  |  |  |  |  |
Compensation cost | $ |  | $ 2,700,000 | $ 2,700,000 |  |  |  |  |  |
Restricted stock [Member] | Tranche One [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Stock option vesting term |  | 3 years |  |  |  |  |  |  |
Restricted stock [Member] | Tranche Two [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Stock option vesting term |  | 5 years |  |  |  |  |  |  |
Performance Shares [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Settled in cash |  | 45,592 |  |  |  |  |  |  |
Shares granted |  | 4,705 |  |  |  |  |  |  |
Performance Shares [Member] | Phantom Plan |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Shares granted |  | 60,047 |  |  |  |  |  |  |
Performance Shares [Member] | 2021 Long-Term Stock Incentive Plan |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Shares granted |  | 0 |  |  |  |  |  |  |
Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ |  | $ 9,900,000 |  |  |  |  |  |  |
Weighted average period over which unrecognized compensation is expected to be recognized (in years) |  | 1 year 2 months 19 days |  |  |  |  |  |  |
Restricted Stock Units [Member] | Forecast Member |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Settled in cash |  |  |  | 126,160 | 126,160 |  |  |  |
Restricted Stock Units [Member] | 2021 Long-Term Stock Incentive Plan |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Shares granted |  | 0 |  |  |  |  |  |  |
Employee Stock [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Compensation cost | $ |  | $ 32,000 | $ 48,000 |  |  |  |  |  |
Number of share purchase rights authorized |  | 150,000 |  |  |  |  |  |  |
Additional common stock to be issued | 200,000 |  |  |  |  |  |  |  |
Percentage of closing market price on purchase date |  | 85.00% |  |  |  |  |  |  |
Phantom Units |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ |  | $ 9,400,000 |  |  |  |  |  |  |
Consumer and Other [Member] | Closed-end Loans [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Threshold for determining nonaccrual status |  | 120 days |  |  |  |  |  |  |
Consumer and Other [Member] | Open-end Loans [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Threshold for determining nonaccrual status |  | 180 days |  |  |  |  |  |  |
Small Business Administration Loans [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Loans held for sale | $ |  | $ 4,400,000 |  |  |  |  | $ 7,200,000 |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Cash equivalents original maturities period |  | 90 days |  |  |  |  |  |  |
Short term borrowings original maturities period |  | 90 days |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 15 years |  |  |  |  |  |  |
Maximum [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Option term |  | 10 years |  |  |  |  |  |  |
Maximum [Member] | Employee Stock [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Percentage of compensation contributable |  | 15.00% |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 5 years |  |  |  |  |  |  |
Minimum [Member] | Employee Stock [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Percentage of compensation contributable |  | 1.00% |  |  |  |  |  |  |
ASU 2016-13 [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Net increase to retained earnings | $ |  |  |  |  |  |  |  |  | $ 3,900,000
Reduction to allowance for credit losses | $ |  |  |  |  |  |  |  |  | $ 5,500,000
Peapack-Gladstone Mortgage Group, Inc. [Member] | Peapack Ventures, LLC [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Percentage of interest owned |  | 99.00% |  |  |  |  |  |  |
Peapack-Gladstone Mortgage Group, Inc. [Member] | Peapack-Gladstone Realty, Inc [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Percentage of interest owned |  | 79.00% |  |  |  |  |  |  |
PGB Trust & Investments of Delaware [Member] | Peapack Ventures, LLC [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Percentage of interest owned |  | 1.00% |  |  |  |  |  |  |
Peapack Ventures, LLC [Member] | Peapack-Gladstone Realty, Inc [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Percentage of interest owned |  | 21.00% |  |  |  |  |  |  |

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