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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 31, 2020
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Jun. 30, 2021
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Sep. 30, 2020
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Jun. 30, 2021
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Dec. 31, 2022
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Dec. 31, 2021
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Dec. 31, 2020
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Jan. 01, 2022
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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         $ 152,200,000 $ 97,500,000    
Threshold period for loan         30 days      
Threshold for determining nonaccrual status         90 days      
Non-impaired special mention loans multiple           2.25    
Non-impaired substandard loans multiple             3.25  
Loan modifications         $ 947,000,000.0      
Post-modification outstanding recorded investment         $ 11,208,000 $ 2,691,000 $ 462,000  
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         25,023 26,693 56,849  
Antidilutive securities | shares         291,462 264,317 393,501  
Net increase to retained earnings         $ 348,798,000 $ 274,288,000    
Reduction to allowance for credit losses         $ (752,000)      
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
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      
Additional common stock to be issued | shares 200,000              
Percentage of closing market price on purchase date         85.00%      
Compensation cost         $ 145,000 126,000 $ 224,000  
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         1,700,000      
Deferral [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Post-modification outstanding recorded investment         $ 0      
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         $ 17,200,000 $ 32,500,000    
Maximum [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Cash equivalents original maturities period         90 days      
Short term borrowings original maturities period         90 days      
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%