XML 45 R35.htm IDEA: XBRL DOCUMENT v3.21.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)
 1 Months Ended 3 Months Ended
May 31, 2020
shares
Mar. 31, 2021
USD ($)
segment
$ / shares
shares
Sep. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
shares
Dec. 31, 2020
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   $ 77,000,000.0     $ 65,500,000
Threshold period for loan   30 days      
Threshold for determining nonaccrual status   90 days      
Loan modifications   $ 946,700,000      
Post-modification outstanding recorded investment       $ 301,000  
Sale of loans servicing released to third party     $ 355,000,000.0    
Closing stock price of common stock | $ / shares   $ 30.88      
Stock options granted | shares   0      
Issuance of shares for Employee Stock Purchase Plan, shares | shares   8,425   0  
Antidilutive securities | shares   239,472   570,102  
Restricted stock [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Shares granted | shares   187,762      
Compensation cost   $ 1,700,000   $ 1,500,000  
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   51,710      
Restricted Stock Units [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Unrecognized compensation cost   $ 17,400,000      
Weighted average period over which unrecognized compensation is expected to be recognized (in years)   1 year 7 months 24 days      
Employee Stock [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Compensation cost   $ 30,000   $ 41,000  
Number of share purchase rights authorized | shares   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%      
Deferral [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Post-modification outstanding recorded investment   $ 42,757,000      
U.S. Small Business Administration (SBA) Loans [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Paycheck Protection Program, maximum credit facility   650,000,000      
Paycheck protection program loans remaining balance   $ 232,700,000      
Substandard [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Loan reserve multiple   3.25     3.25
Special Mention [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Loan reserve multiple   2.25     2.25
Consumer and Other [Member] | Closed-end Loans [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Threshold for determining nonaccrual status   120 days      
Consumer and Other [Member] | Open-end Loans [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Threshold for determining nonaccrual status   180 days      
Small Business Administration Loans [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Loans held for sale   $ 1,800,000     $ 6,000,000.0
SBA Paycheck Protection Program [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Loans held for sale   $ 45,800,000      
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%      
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%