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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
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May 31, 2020 shares | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) shares | Jun. 30, 2020 USD ($) segment $ / shares shares | Jun. 30, 2019 USD ($) shares | Dec. 31, 2019 USD ($)
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 |  | $ 62,900,000 |  | $ 62,900,000 |  | $ 51,900,000
Threshold period for loan |  |  |  | 30 days |  |
Threshold for determining nonaccrual status |  | 90 days |  | 90 days |  |
Loan reserve multiple |  | 2.25 |  | 2.25 |  | 2.25
Loan modifications |  |  |  | $ 913,700,000 |  |
Closing stock price of common stock | $ / shares |  | $ 18.73 |  | $ 18.73 |  |
Stock options granted | shares |  | 0 |  | 0 |  |
Issuance of shares for Employee Stock Purchase Plan, shares | shares |  | 46,935 | 8,564 | 46,935 | 18,740 |
Antidilutive securities | shares |  | 297,320 | 128,634 | 713,789 | 297,828 |
Assets under management and/or administration |  | $ 7,200,000,000 |  | $ 7,200,000,000 |  | $ 7,500,000,000
Percentage of assets under management |  |  |  | 4.00% |  |
Impairment of intangible assets |  |  |  | $ 0 |  |
Restricted stock [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Shares granted | shares |  | 46,956 |  | 528,038 |  |
Compensation cost |  | $ 1,700,000 | $ 1,500,000 | $ 3,300,000 | $ 2,900,000 |
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] |  |  |  |  |  |
Shares granted | shares |  | 0 |  | 130,832 |  |
Restricted Stock Units [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Unrecognized compensation cost |  | $ 15,600,000 |  | $ 15,600,000 |  |
Weighted average period over which unrecognized compensation is expected to be recognized (in years) |  |  |  | 1 year 8 months 8 days |  |
Employee Stock [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Compensation cost |  | $ 149,000 | $ 30,000 | $ 190,000 | $ 75,000 |
Number of share purchase rights authorized | shares |  | 150,000 |  | 150,000 |  |
Additional common stock to be issued | shares | 200,000 |  |  |  |  |
Share purchase rights offering period |  |  |  | 12 months |  |
Percentage of closing market price on purchase date |  |  |  | 85.00% |  |
U.S. Small Business Administration (SBA) Loans [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Paycheck Protection Program, maximum credit facility |  | $ 600,000,000 |  | $ 600,000,000 |  |
Substandard [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Loan reserve multiple |  | 3.25 |  | 3.25 |  | 3.25
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 |  | $ 1,800,000 |  | $ 1,800,000 |  | $ 4,600,000
Paycheck Protection Program Loans [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Loans held for sale |  | $ 25,400,000 |  | $ 25,400,000 |  |
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 |  |
Stock option vesting term |  |  |  | 5 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% |  |
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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