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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Sep. 30, 2020
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Jun. 30, 2021
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Dec. 31, 2021
USD ($)
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Dec. 31, 2020
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Dec. 31, 2019
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May 31, 2020
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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       $ 97,500,000 $ 65,500,000    
Threshold period for loan       30 days      
Threshold for determining nonaccrual status       90 days      
Loan modifications       $ 947,000,000.0      
Post-modification outstanding recorded investment       $ 2,691,000 $ 462,000 $ 6,558,000  
Sale of loans servicing released to third party $ 56,500,000 $ 355,000,000.0 $ 124,000,000        
Issuance of shares for Employee Stock Purchase Plan, shares | shares       26,693 56,849 18,740  
Antidilutive securities | shares       264,317 393,501 277,677  
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       $ 126,000 $ 224,000 $ 158,000  
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       $ 650,000,000.0      
Paycheck protection program loans remaining balance       13,800,000      
Deferral [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Post-modification outstanding recorded investment       $ 25,551,000      
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       3.25 3.25    
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       $ 32,500,000 $ 6,000,000.0    
Maximum [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Cash equivalents original maturities period       90 days      
Short term borrowings 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%