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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
shares
Jun. 30, 2023
USD ($)
shares
Jun. 30, 2024
USD ($)
Segment
shares
Jun. 30, 2023
USD ($)
shares
Dec. 31, 2026
shares
Dec. 31, 2025
shares
Apr. 30, 2024
shares
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Summary Of Significant Accounting Policies [Line Items]                      
Net increase to retained earnings | $ $ 408,481,000   $ 408,481,000           $ 394,094,000    
Reduction to allowance for credit losses | $ (67,984,000) $ (62,704,000) $ (67,984,000) $ (62,704,000)       $ (66,251,000) (65,888,000) $ (62,250,000) $ (60,829,000)
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 | $ $ 161,200,000   $ 161,200,000           162,900,000    
Threshold period for loan     30 days                
Threshold for determining nonaccrual status 90 days   90 days                
Settled in cash     100,349                
Stock options granted 0   0                
Unrecognized compensation cost | $ $ 0   $ 0                
Issuance of shares for Employee Stock Purchase Plan, shares 4,614 10,108 15,759 17,641              
Antidilutive securities 250,510 556,743 277,945 420,090              
Phantom Plan                      
Summary Of Significant Accounting Policies [Line Items]                      
Stock options granted     237,811                
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]                      
Settled in cash     (120,835)                
Shares granted     0                
Compensation cost | $ $ 3,200,000 $ 3,600,000 $ 5,900,000 $ 6,300,000              
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]                      
Settled in cash     45,592                
Shares granted     4,705                
Performance Shares [Member] | Phantom Plan                      
Summary Of Significant Accounting Policies [Line Items]                      
Shares granted     60,047                
Performance Shares [Member] | 2021 Long-Term Stock Incentive Plan                      
Summary Of Significant Accounting Policies [Line Items]                      
Shares granted     0                
Restricted Stock Units [Member]                      
Summary Of Significant Accounting Policies [Line Items]                      
Unrecognized compensation cost | $ 9,200,000   $ 9,200,000                
Weighted average period over which unrecognized compensation is expected to be recognized (in years)     1 year 1 month 13 days                
Restricted Stock Units [Member] | Forecast Member                      
Summary Of Significant Accounting Policies [Line Items]                      
Settled in cash         120,835 120,835          
Restricted Stock Units [Member] | 2021 Long-Term Stock Incentive Plan                      
Summary Of Significant Accounting Policies [Line Items]                      
Shares granted     0                
Employee Stock [Member]                      
Summary Of Significant Accounting Policies [Line Items]                      
Compensation cost | $ 43,000 58,000 $ 75,000 106,000              
Percentage of closing market price on purchase date     85.00%                
Phantom Units                      
Summary Of Significant Accounting Policies [Line Items]                      
Unrecognized compensation cost | $ 8,400,000   $ 8,400,000                
Consumer and Other [Member]                      
Summary Of Significant Accounting Policies [Line Items]                      
Reduction to allowance for credit losses | $ $ (928,000) $ (695,000) $ (928,000) $ (695,000)       $ (915,000) (869,000) $ (661,000) $ (537,000)
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 | $ $ 3,300,000   $ 3,300,000           $ 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   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%