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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
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May 31, 2020 shares | Jun. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2022 USD ($) Segment shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares | Jan. 01, 2022 USD ($)
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 |  |  |  |  | $ 152,200,000 | $ 97,500,000 |  |
Threshold period for loan |  |  |  |  | 30 days |  |  |
Threshold for determining nonaccrual status |  |  |  |  | 90 days |  |  |
Non-impaired special mention loans multiple |  |  |  |  |  | 2.25 |  |
Non-impaired substandard loans multiple |  |  |  |  |  |  | 3.25 |
Loan modifications |  |  |  |  | $ 947,000,000.0 |  |  |
Post-modification outstanding recorded investment |  |  |  |  | $ 11,208,000 | $ 2,691,000 | $ 462,000 |
Sale of loans servicing released to third party |  | $ 56,500,000 | $ 355,000,000.0 | $ 124,000,000 |  |  |  |
Issuance of shares for Employee Stock Purchase Plan, shares | shares |  |  |  |  | 25,023 | 26,693 | 56,849 |
Antidilutive securities | shares |  |  |  |  | 291,462 | 264,317 | 393,501 |
Net increase to retained earnings |  |  |  |  | $ 348,798,000 | $ 274,288,000 |  |
Reduction to allowance for credit losses |  |  |  |  | $ (752,000) |  |  |
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
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 |  |  |
Additional common stock to be issued | shares | 200,000 |  |  |  |  |  |  |
Percentage of closing market price on purchase date |  |  |  |  | 85.00% |  |  |
Compensation cost |  |  |  |  | $ 145,000 | 126,000 | $ 224,000 |
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 |  |  |  |  | $ 650,000,000.0 |  |  |
Paycheck protection program loans remaining balance |  |  |  |  | 1,700,000 |  |  |
Deferral [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Post-modification outstanding recorded investment |  |  |  |  | $ 0 |  |  |
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 |  |  |  |  | $ 17,200,000 | $ 32,500,000 |  |
Maximum [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Cash equivalents original maturities period |  |  |  |  | 90 days |  |  |
Short term borrowings original maturities period |  |  |  |  | 90 days |  |  |
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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