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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |
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Jun. 30, 2024 USD ($) shares | Jun. 30, 2023 USD ($) shares | Jun. 30, 2024 USD ($) Segment shares | Jun. 30, 2023 USD ($) shares | Dec. 31, 2026 shares | Dec. 31, 2025 shares | Apr. 30, 2024 shares | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net increase to retained earnings | $ | $ 408,481,000 |  | $ 408,481,000 |  |  |  |  |  | $ 394,094,000 |  |
Reduction to allowance for credit losses | $ | (67,984,000) | $ (62,704,000) | $ (67,984,000) | $ (62,704,000) |  |  |  | $ (66,251,000) | (65,888,000) | $ (62,250,000) | $ (60,829,000)
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 | $ | $ 161,200,000 |  | $ 161,200,000 |  |  |  |  |  | 162,900,000 |  |
Threshold period for loan |  |  | 30 days |  |  |  |  |  |  |  |
Threshold for determining nonaccrual status | 90 days |  | 90 days |  |  |  |  |  |  |  |
Settled in cash |  |  | 100,349 |  |  |  |  |  |  |  |
Stock options granted | 0 |  | 0 |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ | $ 0 |  | $ 0 |  |  |  |  |  |  |  |
Issuance of shares for Employee Stock Purchase Plan, shares | 4,614 | 10,108 | 15,759 | 17,641 |  |  |  |  |  |  |
Antidilutive securities | 250,510 | 556,743 | 277,945 | 420,090 |  |  |  |  |  |  |
Phantom Plan |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock options granted |  |  | 237,811 |  |  |  |  |  |  |  |
2024 ESPP |  |  |  |  |  |  |  |  |  |  |
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 |  |  | (120,835) |  |  |  |  |  |  |  |
Shares granted |  |  | 0 |  |  |  |  |  |  |  |
Compensation cost | $ | $ 3,200,000 | $ 3,600,000 | $ 5,900,000 | $ 6,300,000 |  |  |  |  |  |  |
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 | $ | 9,200,000 |  | $ 9,200,000 |  |  |  |  |  |  |  |
Weighted average period over which unrecognized compensation is expected to be recognized (in years) |  |  | 1 year 1 month 13 days |  |  |  |  |  |  |  |
Restricted Stock Units [Member] | Forecast Member |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Settled in cash |  |  |  |  | 120,835 | 120,835 |  |  |  |  |
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 | $ | 43,000 | 58,000 | $ 75,000 | 106,000 |  |  |  |  |  |  |
Percentage of closing market price on purchase date |  |  | 85.00% |  |  |  |  |  |  |  |
Phantom Units |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ | 8,400,000 |  | $ 8,400,000 |  |  |  |  |  |  |  |
Consumer and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reduction to allowance for credit losses | $ | $ (928,000) | $ (695,000) | $ (928,000) | $ (695,000) |  |  |  | $ (915,000) | (869,000) | $ (661,000) | $ (537,000)
Consumer and Other [Member] | Closed-end Loans [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Threshold for determining nonaccrual status | 120 days |  | 120 days |  |  |  |  |  |  |  |
Consumer and Other [Member] | Open-end Loans [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Threshold for determining nonaccrual status | 180 days |  | 180 days |  |  |  |  |  |  |  |
Small Business Administration Loans [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans held for sale | $ | $ 3,300,000 |  | $ 3,300,000 |  |  |  |  |  | $ 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 |  | 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 |  | 5 years |  |  |  |  |  |  |  |
Minimum [Member] | Employee Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of compensation contributable |  |  | 1.00% |  |  |  |  |  |  |  |
Peapack-Gladstone Mortgage Group, Inc. [Member] | Peapack Ventures, LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of interest owned | 99.00% |  | 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% |  | 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% |  | 1.00% |  |  |  |  |  |  |  |
Peapack Ventures, LLC [Member] | Peapack-Gladstone Realty, Inc [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of interest owned | 21.00% |  | 21.00% |  |  |  |  |  |  |  |

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