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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |  |
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Apr. 30, 2024 | Dec. 31, 2023
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Net increase to retained earnings | $ 446,075,000 |  | $ 446,075,000 |  |  | $ 423,552,000 |  |  |
Reduction to allowance for credit losses | (68,642,000) | $ (71,283,000) | $ (68,642,000) | $ (71,283,000) | $ (81,770,000) | (72,992,000) | $ (67,984,000) |  | $ (65,888,000)
Federal funds sales periods |  |  | 1 day |  |  |  |  |  |
Interest-earning deposits maturities period |  |  | 1 year |  |  |  |  |  |
Servicing rights |  |  | $ 0 |  |  |  |  |  |
Amount of loans serviced | 140,200,000 |  | 140,200,000 |  |  | 139,400,000 |  |  |
Loans held for sale | $ 9,000,000 |  | $ 9,000,000 |  |  | 9,300,000 |  |  |
Threshold period for loan |  |  | 30 days |  |  |  |  |  |
Threshold for determining nonaccrual status | 90 days |  | 90 days |  |  |  |  |  |
Stock options granted | 0 |  | 0 |  |  |  |  |  |
Unrecognized compensation cost | $ 0 |  | $ 0 |  |  |  |  |  |
Issuance of shares for Employee Stock Purchase Plan, shares | 12,207 | 11,257 | 29,015 | 27,016 |  |  |  |  |
Antidilutive securities | 18,583 | 125,152 | 18,583 | 277,141 |  |  |  |  |
Phantom Plan |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Stock options granted |  |  | 196,077 |  |  |  |  |  |
2024 ESPP |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Number of share purchase rights authorized |  |  |  |  |  |  |  | 150,000 |
Restricted stock [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Shares granted |  |  | 88,101 |  |  |  |  |  |
Compensation cost | $ 2,400,000 | $ 3,400,000 | $ 8,200,000 | $ 9,300,000 |  |  |  |  |
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 |  |  | 66,252 |  |  |  |  |  |
Performance Shares [Member] | 2021 Long-Term Stock Incentive Plan |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Shares granted |  |  | 66,252 |  |  |  |  |  |
Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation cost | 6,100,000 |  | $ 6,100,000 |  |  |  |  |  |
Weighted average period over which unrecognized compensation is expected to be recognized (in years) |  |  | 1 year 11 months 15 days |  |  |  |  |  |
Restricted Stock Units [Member] | 2021 Long-Term Stock Incentive Plan |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Shares granted |  |  | 88,101 |  |  |  |  |  |
Employee Stock [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Compensation cost | 56,000 | 56,000 | $ 151,000 | 131,000 |  |  |  |  |
Percentage of closing market price on purchase date |  |  | 85.00% |  |  |  |  |  |
Phantom Units |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation cost | 9,100,000 |  | $ 9,100,000 |  |  |  |  |  |
Weighted average period over which unrecognized compensation is expected to be recognized (in years) |  |  | 2 years 10 days |  |  |  |  |  |
Consumer and Other [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Reduction to allowance for credit losses | $ (2,877,000) | $ (1,026,000) | $ (2,877,000) | $ (1,026,000) | $ (2,488,000) | $ (1,184,000) | $ (928,000) |  | $ (869,000)
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 |  |  |  |  |  |
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 |  | 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% |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  | 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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