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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2020
shares
Jun. 30, 2023
USD ($)
$ / shares
shares
Jun. 30, 2022
USD ($)
shares
Jun. 30, 2023
USD ($)
Segment
$ / shares
shares
Jun. 30, 2022
USD ($)
shares
Dec. 31, 2022
USD ($)
Jan. 01, 2022
USD ($)
Summary Of Significant Accounting Policies [Line Items]              
Net increase to retained earnings   $ 378,525,000   $ 378,525,000   $ 348,798,000  
Reduction to allowance for credit losses   (831,000) $ (991,000) $ (831,000) $ (991,000) (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   $ 164,400,000   $ 164,400,000   152,200,000  
Threshold period for loan       30 days      
Threshold for determining nonaccrual status   90 days   90 days      
Post-modification outstanding recorded investment         $ 12,471,000    
Closing stock price of common stock | $ / shares   $ 27.08   $ 27.08      
Stock options granted | shares   0   0      
Unrecognized compensation cost   $ 0   $ 0      
Issuance of shares for Employee Stock Purchase Plan, shares | shares   10,108 7,120 17,641 13,928    
Antidilutive securities | shares   556,743 300,925 420,090 300,925    
Restricted stock [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Shares granted | shares   1,817   271,387      
Compensation cost   $ 3,600,000 $ 1,700,000 $ 6,300,000 $ 3,600,000    
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   3,684   126,821      
Restricted Stock Units [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Unrecognized compensation cost   $ 19,600,000   $ 19,600,000      
Weighted average period over which unrecognized compensation is expected to be recognized (in years)       1 year 4 months 2 days      
Employee Stock [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Compensation cost   $ 58,000 $ 42,000 $ 106,000 $ 77,000    
Number of share purchase rights authorized | shares   150,000   150,000      
Additional common stock to be issued | shares 200,000            
Percentage of closing market price on purchase date       85.00%      
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   $ 15,500,000   $ 15,500,000   $ 17,200,000  
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%   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%