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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) segment shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | May 31, 2020 shares
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
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 |  | $ 65,500,000 | $ 51,900,000 |  |
Threshold period for loan |  | 30 days |  |  |
Threshold for determining nonaccrual status |  | 90 days |  |  |
Loan modifications |  | $ 946,300,000 |  |  |
Post-modification outstanding recorded investment |  | $ 462,000 | $ 6,558,000 | $ 16,111,000 |
Sale of loans servicing released to third party | $ 355,000,000.0 |  |  |  |
Issuance of shares for Employee Stock Purchase Plan, shares | shares |  | 56,849 | 18,740 | 29,273 |
Antidilutive securities | shares |  | 393,501 | 277,677 | 257,422 |
Stock dividends excess threshold percentage |  | 20.00% |  |  |
Stock dividend threshold or less percentage |  | 20.00% |  |  |
Goodwill impairment loss |  | $ 0 |  |  |
Employee Stock Option [Member] |  |  |  |  |
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] |  |  |  |  |
Number of share purchase rights authorized | shares |  | 150,000 |  |  | 200,000
Share purchase rights offering period |  | 12 months |  |  |
Percentage of closing market price on purchase date |  | 85.00% |  |  |
Compensation cost |  | $ 224,000 | $ 158,000 | $ 189,000 |
Premises [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Useful life |  | 40 years |  |  |
U.S. Small Business Administration (SBA) Loans [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Paycheck protection program, maximum credit facility |  | $ 600,000,000 |  |  |
Paycheck protection program loans remaining balance |  | 195,600,000 |  |  |
Deferral [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Post-modification outstanding recorded investment |  | $ 73,972,000 |  |  |
Special Mention [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Loan reserve multiple |  | 2.25 | 2.25 |  |
Substandard [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Loan reserve multiple |  | 3.5 | 3.5 |  |
Consumer and Other [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Threshold for determining nonaccrual status |  | 120 days |  |  |
Small Business Administration Loans [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Loans held for sale |  | $ 6,000,000.0 | $ 4,600,000 |  |
Maximum [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cash equivalents original maturities period |  | 90 days |  |  |
Paycheck protection loans repayment period |  | 5 years |  |  |
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% |  |  |
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] |  |  |  |  |
Paycheck protection loans repayment period |  | 2 years |  |  |
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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