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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)
 3 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
segment
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
May 31, 2020
shares
Summary Of Significant Accounting Policies [Line Items]          
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   $ 65,500,000 $ 51,900,000    
Threshold period for loan   30 days      
Threshold for determining nonaccrual status   90 days      
Loan modifications   $ 946,300,000      
Post-modification outstanding recorded investment   $ 462,000 $ 6,558,000 $ 16,111,000  
Sale of loans servicing released to third party $ 355,000,000.0        
Issuance of shares for Employee Stock Purchase Plan, shares | shares   56,849 18,740 29,273  
Antidilutive securities | shares   393,501 277,677 257,422  
Stock dividends excess threshold percentage   20.00%      
Stock dividend threshold or less percentage   20.00%      
Goodwill impairment loss   $ 0      
Employee Stock Option [Member]          
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]          
Number of share purchase rights authorized | shares   150,000     200,000
Share purchase rights offering period   12 months      
Percentage of closing market price on purchase date   85.00%      
Compensation cost   $ 224,000 $ 158,000 $ 189,000  
Premises [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Useful life   40 years      
U.S. Small Business Administration (SBA) Loans [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Paycheck protection program, maximum credit facility   $ 600,000,000      
Paycheck protection program loans remaining balance   195,600,000      
Deferral [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Post-modification outstanding recorded investment   $ 73,972,000      
Special Mention [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Loan reserve multiple   2.25 2.25    
Substandard [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Loan reserve multiple   3.5 3.5    
Consumer and Other [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Threshold for determining nonaccrual status   120 days      
Small Business Administration Loans [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Loans held for sale   $ 6,000,000.0 $ 4,600,000    
Maximum [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Cash equivalents original maturities period   90 days      
Paycheck protection loans repayment period   5 years      
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%      
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]          
Paycheck protection loans repayment period   2 years      
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%