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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, 2020
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2020
USD ($)
segment
$ / shares
shares
Jun. 30, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
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   $ 62,900,000   $ 62,900,000   $ 51,900,000
Threshold period for loan       30 days    
Threshold for determining nonaccrual status   90 days   90 days    
Loan reserve multiple   2.25   2.25   2.25
Loan modifications       $ 913,700,000    
Closing stock price of common stock | $ / shares   $ 18.73   $ 18.73    
Stock options granted | shares   0   0    
Issuance of shares for Employee Stock Purchase Plan, shares | shares   46,935 8,564 46,935 18,740  
Antidilutive securities | shares   297,320 128,634 713,789 297,828  
Assets under management and/or administration   $ 7,200,000,000   $ 7,200,000,000   $ 7,500,000,000
Percentage of assets under management       4.00%    
Impairment of intangible assets       $ 0    
Restricted stock [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Shares granted | shares   46,956   528,038    
Compensation cost   $ 1,700,000 $ 1,500,000 $ 3,300,000 $ 2,900,000  
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   0   130,832    
Restricted Stock Units [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Unrecognized compensation cost   $ 15,600,000   $ 15,600,000    
Weighted average period over which unrecognized compensation is expected to be recognized (in years)       1 year 8 months 8 days    
Employee Stock [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Compensation cost   $ 149,000 $ 30,000 $ 190,000 $ 75,000  
Number of share purchase rights authorized | shares   150,000   150,000    
Additional common stock to be issued | shares 200,000          
Share purchase rights offering period       12 months    
Percentage of closing market price on purchase date       85.00%    
U.S. Small Business Administration (SBA) Loans [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Paycheck Protection Program, maximum credit facility   $ 600,000,000   $ 600,000,000    
Substandard [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Loan reserve multiple   3.25   3.25   3.25
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   $ 1,800,000   $ 1,800,000   $ 4,600,000
Paycheck Protection Program Loans [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Loans held for sale   $ 25,400,000   $ 25,400,000    
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    
Stock option vesting term       5 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%    
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%