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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Mar. 01, 2022
Jun. 30, 2021
Cover [Abstract]      
Entity Registrant Name PEAPACK-GLADSTONE FINANCIAL CORPORATION    
Entity Central Index Key 0001050743    
Document Type 10-K    
Document Period End Date Dec. 31, 2021    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Public Float     $ 553
Entity Common Stock, Shares Outstanding   18,255,802  
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Trading Symbol PGC    
Entity File Number 001-16197    
Entity Tax Identification Number 22-3537895    
Entity Address, Address Line One 500 Hills Drive    
Entity Address, Address Line Two Suite 300    
Entity Address, City or Town Bedminster    
Entity Address, State or Province NJ    
Entity Address, Postal Zip Code 07921    
City Area Code 908    
Local Phone Number 234-0700    
Entity Incorporation, State or Country Code NJ    
Entity Interactive Data Current Yes    
Title of 12(b) Security Common Stock, No par value    
Security Exchange Name NASDAQ    
Document Annual Report true    
Document Transition Report false    
ICFR Auditor Attestation Flag true    
Auditor Firm ID 173    
Auditor Name Crowe LLP    
Auditor Location Livingston, New Jersey USA    
Documents Incorporated by Reference

Portions of the Company’s Definitive Proxy Statement for the Company’s 2022 Annual Meeting of Shareholders (the “2022 Proxy Statement”) are incorporated by reference into Part III.  The Company expects to file the 2022 Proxy Statement within 120 days of December 31, 2021.