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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)
 3 Months Ended
Mar. 31, 2026
USD ($)
Segment
shares
Mar. 31, 2025
USD ($)
shares
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Summary Of Significant Accounting Policies [Line Items]        
Number of reportable segments | Segment 2      
Net increase to retained earnings $ 470,631,000   $ 457,357,000  
Reduction to allowance for credit losses $ (67,026,000) $ (75,150,000) (71,039,000) $ (72,992,000)
Federal funds sales periods 1 day      
Interest-earning deposits maturities period 1 year      
Servicing rights $ 0      
Amount of loans serviced 130,400,000   132,500,000  
Loans held for sale $ 9,200,000   4,800,000  
Threshold period for loan 30 days      
Threshold for determining nonaccrual status 90 days      
Stock options granted | shares 0      
Unrecognized compensation cost $ 0      
Issuance of shares for Employee Stock Purchase Plan, shares | shares 11,013 7,115    
Antidilutive securities | shares 76,496 20,885    
Phantom Plan        
Summary Of Significant Accounting Policies [Line Items]        
Stock options granted | shares 98,316      
2024 ESPP        
Summary Of Significant Accounting Policies [Line Items]        
Number of share purchase rights authorized | shares 150,000      
Restricted stock [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Shares granted | shares 93,714      
Compensation cost $ 555,000 $ 1,600,000    
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 133,354      
Performance Shares [Member] | 2025 Long-Term Stock Incentive Plan [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Shares granted | shares 133,354      
Market Based RSUs [Member] | 2025 Long-Term Stock Incentive Plan [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Shares granted | shares 66,000      
Restricted Stock Units [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Unrecognized compensation cost $ 13,100,000      
Weighted average period over which unrecognized compensation is expected to be recognized (in years) 2 years 6 months 7 days      
Restricted Stock Units [Member] | 2025 Long-Term Stock Incentive Plan [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Shares granted | shares 93,714      
Employee Stock [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Compensation cost $ 56,000 39,000    
Percentage of closing market price on purchase date 85.00%      
Phantom Units        
Summary Of Significant Accounting Policies [Line Items]        
Unrecognized compensation cost $ 11,900,000      
Weighted average period over which unrecognized compensation is expected to be recognized (in years) 2 years 18 days      
Compensation cost $ 2,800,000 1,700,000    
Consumer and Other [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Reduction to allowance for credit losses $ (3,490,000) $ (2,574,000) $ (3,192,000) $ (1,184,000)
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      
Maximum [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Cash equivalents original maturities period 90 days      
Short term borrowings original maturities period 90 days      
Vesting percentage 250.00%      
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%      
Minimum [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Vesting percentage 0.00%      
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%