v3.26.1
Fair Value Measurements - Summary of Investments Measured at Fair Value (Details) - EBP 002 [Member] - USD ($)
Dec. 31, 2025
Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]    
Total $ 117,795,801 $ 99,047,761
Quoted Prices In Active Markets for Identical Assets (Level 1)    
EBP, Investment, Fair Value and NAV [Line Items]    
Total 117,795,801 99,047,761
Significant Other Observable Inputs (Level 2)    
EBP, Investment, Fair Value and NAV [Line Items]    
Total 0 0
Significant Unobservable Inputs (Level 3)    
EBP, Investment, Fair Value and NAV [Line Items]    
Total 0 0
Peapack-Gladstone Financial Corporation Common Stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total 3,502,803 4,498,163
Peapack-Gladstone Financial Corporation Common Stock | Quoted Prices In Active Markets for Identical Assets (Level 1)    
EBP, Investment, Fair Value and NAV [Line Items]    
Total 3,502,803 4,498,163
Peapack-Gladstone Financial Corporation Common Stock | Significant Other Observable Inputs (Level 2)    
EBP, Investment, Fair Value and NAV [Line Items]    
Total 0 0
Peapack-Gladstone Financial Corporation Common Stock | Significant Unobservable Inputs (Level 3)    
EBP, Investment, Fair Value and NAV [Line Items]    
Total 0 0
Mutual Funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total 114,292,998 94,549,598
Mutual Funds | Quoted Prices In Active Markets for Identical Assets (Level 1)    
EBP, Investment, Fair Value and NAV [Line Items]    
Total 114,292,998 94,549,598
Mutual Funds | Significant Other Observable Inputs (Level 2)    
EBP, Investment, Fair Value and NAV [Line Items]    
Total 0 0
Mutual Funds | Significant Unobservable Inputs (Level 3)    
EBP, Investment, Fair Value and NAV [Line Items]    
Total $ 0 $ 0