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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2020
shares
Mar. 31, 2024
USD ($)
Segment
$ / shares
shares
Mar. 31, 2023
USD ($)
shares
Dec. 31, 2026
shares
Dec. 31, 2025
shares
Apr. 30, 2024
shares
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jan. 01, 2022
USD ($)
Summary Of Significant Accounting Policies [Line Items]                  
Net increase to retained earnings | $   $ 401,838,000         $ 394,094,000    
Reduction to allowance for credit losses | $   $ (699,000) $ (801,000)       (687,000) $ (752,000)  
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 | $   $ 159,200,000         162,900,000    
Threshold period for loan   30 days              
Threshold for determining nonaccrual status   90 days              
Closing stock price of common stock | $ / shares   $ 24.33              
Stock options granted   0              
Unrecognized compensation cost | $   $ 0              
Issuance of shares for Employee Stock Purchase Plan, shares   11,145 7,533            
Antidilutive securities   191,016 362,052            
Phantom Plan                  
Summary Of Significant Accounting Policies [Line Items]                  
Stock options granted   237,811              
2024 ESPP | Subsequent Event                  
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   95,024              
Shares granted   0              
Compensation cost | $   $ 2,700,000 $ 2,700,000            
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 | $   $ 9,900,000              
Weighted average period over which unrecognized compensation is expected to be recognized (in years)   1 year 2 months 19 days              
Restricted Stock Units [Member] | Forecast Member                  
Summary Of Significant Accounting Policies [Line Items]                  
Settled in cash       126,160 126,160        
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 | $   $ 32,000 $ 48,000            
Number of share purchase rights authorized   150,000              
Additional common stock to be issued 200,000                
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              
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              
Small Business Administration Loans [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Loans held for sale | $   $ 4,400,000         $ 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 [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              
Minimum [Member] | Employee Stock [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Percentage of compensation contributable   1.00%              
ASU 2016-13 [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Net increase to retained earnings | $                 $ 3,900,000
Reduction to allowance for credit losses | $                 $ 5,500,000
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%