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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) | 3 Months Ended |  |
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Mar. 31, 2026 USD ($) Segment shares | Mar. 31, 2025 USD ($) shares | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Number of reportable segments | Segment | 2 |  |  |
Net increase to retained earnings | $ 470,631,000 |  | $ 457,357,000 |
Reduction to allowance for credit losses | $ (67,026,000) | $ (75,150,000) | (71,039,000) | $ (72,992,000)
Federal funds sales periods | 1 day |  |  |
Interest-earning deposits maturities period | 1 year |  |  |
Servicing rights | $ 0 |  |  |
Amount of loans serviced | 130,400,000 |  | 132,500,000 |
Loans held for sale | $ 9,200,000 |  | 4,800,000 |
Threshold period for loan | 30 days |  |  |
Threshold for determining nonaccrual status | 90 days |  |  |
Stock options granted | shares | 0 |  |  |
Unrecognized compensation cost | $ 0 |  |  |
Issuance of shares for Employee Stock Purchase Plan, shares | shares | 11,013 | 7,115 |  |
Antidilutive securities | shares | 76,496 | 20,885 |  |
Phantom Plan |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Stock options granted | shares | 98,316 |  |  |
2024 ESPP |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Number of share purchase rights authorized | shares | 150,000 |  |  |
Restricted stock [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Shares granted | shares | 93,714 |  |  |
Compensation cost | $ 555,000 | $ 1,600,000 |  |
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 | 133,354 |  |  |
Performance Shares [Member] | 2025 Long-Term Stock Incentive Plan [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Shares granted | shares | 133,354 |  |  |
Market Based RSUs [Member] | 2025 Long-Term Stock Incentive Plan [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Shares granted | shares | 66,000 |  |  |
Restricted Stock Units [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Unrecognized compensation cost | $ 13,100,000 |  |  |
Weighted average period over which unrecognized compensation is expected to be recognized (in years) | 2 years 6 months 7 days |  |  |
Restricted Stock Units [Member] | 2025 Long-Term Stock Incentive Plan [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Shares granted | shares | 93,714 |  |  |
Employee Stock [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Compensation cost | $ 56,000 | 39,000 |  |
Percentage of closing market price on purchase date | 85.00% |  |  |
Phantom Units |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Unrecognized compensation cost | $ 11,900,000 |  |  |
Weighted average period over which unrecognized compensation is expected to be recognized (in years) | 2 years 18 days |  |  |
Compensation cost | $ 2,800,000 | 1,700,000 |  |
Consumer and Other [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Reduction to allowance for credit losses | $ (3,490,000) | $ (2,574,000) | $ (3,192,000) | $ (1,184,000)
Consumer and Other [Member] | Closed-end Loans [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Threshold for determining nonaccrual status | 120 days |  |  |
Consumer and Other [Member] | Open-end Loans [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Threshold for determining nonaccrual status | 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 |  |  |
Vesting percentage | 250.00% |  |  |
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% |  |  |
Minimum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Vesting percentage | 0.00% |  |  |
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% |  |  |
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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