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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, 2022 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) shares | Sep. 30, 2020 USD ($) | Jun. 30, 2022 USD ($) Segment $ / shares shares | Jun. 30, 2021 USD ($) shares | Jan. 01, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Net decrease to retained earnings |  | $ (309,899,000) |  |  | $ (309,899,000) |  |  | $ (274,288,000) |
Reduction to allowance for credit losses |  | (991,000) |  |  | $ (991,000) |  |  |  |
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 |  | $ 138,100,000 |  |  | $ 138,100,000 |  |  | $ 97,500,000 |
Threshold period for loan |  |  |  |  | 30 days |  |  |  |
Threshold for determining nonaccrual status |  | 90 days |  |  | 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 |  |  | $ 3,139,000 |  | $ 12,471,000 | $ 3,139,000 |  |  |
Sale of loans servicing released to third party |  |  | $ 56,500,000 | $ 355,000,000.0 |  | $ 124,000,000 |  |  |
Closing stock price of common stock | $ / shares |  | $ 29.70 |  |  | $ 29.70 |  |  |  |
Stock options granted | shares |  | 0 |  |  | 0 |  |  |  |
Issuance of shares for Employee Stock Purchase Plan, shares | shares |  | 7,120 | 6,347 |  | 13,928 | 14,772 |  |  |
Antidilutive securities | shares |  | 300,925 | 13,374 |  | 300,925 | 262,423 |  |  |
Restricted stock [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Shares granted | shares |  | 1,624 |  |  | 235,534 |  |  |  |
Compensation cost |  | $ 1,800,000 | $ 1,800,000 |  | $ 3,600,000 | $ 3,500,000 |  |  |
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 |  |  | 71,482 |  |  |  |
Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation cost |  | $ 19,000,000.0 |  |  | $ 19,000,000.0 |  |  |  |
Weighted average period over which unrecognized compensation is expected to be recognized (in years) |  |  |  |  | 1 year 5 months 23 days |  |  |  |
Employee Stock [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Compensation cost |  | $ 42,000 | $ 26,000 |  | $ 77,000 | $ 56,000 |  |  |
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% |  |  |  |
Deferral [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Post-modification outstanding recorded investment |  |  |  |  | $ 12,656,000 |  |  |  |
U.S. Small Business Administration (SBA) Loans [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Paycheck Protection Program, maximum credit facility |  | $ 650,000,000 |  |  | 650,000,000 |  |  |  |
Paycheck protection program loans remaining balance |  | $ 9,400,000 |  |  | $ 9,400,000 |  |  |  |
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 |  | $ 15,000,000.0 |  |  | $ 15,000,000.0 |  |  | $ 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 |  |  |  |
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] |  |  |  |  |  |  |  |  |
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% |  |  |  |
ASU 2016-13 [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Net decrease to retained earnings |  |  |  |  |  |  | $ 3,900,000 |  |
Reduction to allowance for credit losses |  |  |  |  |  |  | $ 5,500,000 |  |
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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