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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Apr. 30, 2024
Summary Of Significant Accounting Policies [Line Items]        
Federal funds sales periods 1 day      
Interest-earning deposits maturities period 1 year      
Servicing rights $ 0      
Amount of loans serviced $ 139,400,000 $ 162,900,000    
Threshold period for loan 30 days      
Threshold for determining nonaccrual status 90 days      
Issuance of shares for Employee Stock Purchase Plan, shares 34,575 33,748 25,023  
Antidilutive securities 107,727 387,768 291,462  
Net increase to retained earnings $ 423,552,000 $ 394,094,000    
Reduction to allowance for credit losses $ (72,992,000) (65,888,000) $ (60,829,000)  
Employee Stock Option        
Summary Of Significant Accounting Policies [Line Items]        
Option term 10 years      
Compensation cost $ 0 0 0  
Employee Stock [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Percentage of closing market price on purchase date 85.00%      
Compensation cost $ 154,000 178,000 145,000  
2024 ESPP        
Summary Of Significant Accounting Policies [Line Items]        
Number of share purchase rights authorized       150,000
Premises [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Useful life 40 years      
Consumer and Other [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Threshold for determining nonaccrual status 120 days      
Reduction to allowance for credit losses $ (1,184,000) (869,000) $ (537,000)  
Small Business Administration Loans [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Loans held for sale $ 9,300,000 $ 7,200,000    
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        
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%      
Maximum [Member] | Equipment and Other Fixed Assets [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Useful life 10 years      
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%      
Minimum [Member] | Equipment and Other Fixed Assets [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Useful life 3 years      
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%