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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2025
Dec. 31, 2024
Apr. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Summary Of Significant Accounting Policies [Line Items]                  
Net increase to retained earnings $ 437,321,000   $ 437,321,000     $ 423,552,000      
Reduction to allowance for credit losses (81,770,000) $ (67,984,000) $ (81,770,000) $ (67,984,000) $ (75,150,000) (72,992,000)   $ (66,251,000) $ (65,888,000)
Federal funds sales periods     1 day            
Interest-earning deposits maturities period     1 year            
Servicing rights     $ 0            
Amount of loans serviced 140,800,000   140,800,000     139,400,000      
Loans held for sale $ 5,900,000   $ 5,900,000     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 9,693 4,614 16,808 15,759          
Antidilutive securities 186,691 250,510 71,791 277,945          
Phantom Plan                  
Summary Of Significant Accounting Policies [Line Items]                  
Stock options granted     146,039            
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 $ 3,200,000 $ 5,800,000 $ 5,900,000          
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     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 7,100,000   $ 7,100,000            
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 43,000 $ 95,000 75,000          
Percentage of closing market price on purchase date     85.00%            
Phantom Units                  
Summary Of Significant Accounting Policies [Line Items]                  
Unrecognized compensation cost 9,400,000   $ 9,400,000            
Weighted average period over which unrecognized compensation is expected to be recognized (in years)     2 years 1 month 6 days            
Consumer and Other [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Reduction to allowance for credit losses $ (2,488,000) $ (928,000) $ (2,488,000) $ (928,000) $ (2,574,000) $ (1,184,000)   $ (915,000) $ (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%