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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Apr. 30, 2024
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Federal funds sales periods | 1 day |  |  |
Interest-earning deposits maturities period | 1 year |  |  |
Servicing rights | $ 0 |  |  |
Amount of loans serviced | $ 139,400,000 | $ 162,900,000 |  |
Threshold period for loan | 30 days |  |  |
Threshold for determining nonaccrual status | 90 days |  |  |
Issuance of shares for Employee Stock Purchase Plan, shares | 34,575 | 33,748 | 25,023 |
Antidilutive securities | 107,727 | 387,768 | 291,462 |
Net increase to retained earnings | $ 423,552,000 | $ 394,094,000 |  |
Reduction to allowance for credit losses | $ (72,992,000) | (65,888,000) | $ (60,829,000) |
Employee Stock Option |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Option term | 10 years |  |  |
Compensation cost | $ 0 | 0 | 0 |
Employee Stock [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Percentage of closing market price on purchase date | 85.00% |  |  |
Compensation cost | $ 154,000 | 178,000 | 145,000 |
2024 ESPP |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Number of share purchase rights authorized |  |  |  | 150,000
Premises [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Useful life | 40 years |  |  |
Consumer and Other [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Threshold for determining nonaccrual status | 120 days |  |  |
Reduction to allowance for credit losses | $ (1,184,000) | (869,000) | $ (537,000) |
Small Business Administration Loans [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Loans held for sale | $ 9,300,000 | $ 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 |  |  |
Maximum [Member] | Employee Stock Option |  |  |  |
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% |  |  |
Maximum [Member] | Equipment and Other Fixed Assets [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Useful life | 10 years |  |  |
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% |  |  |
Minimum [Member] | Equipment and Other Fixed Assets [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Useful life | 3 years |  |  |
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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