Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Nov. 02, 2017
Document And Entity Information
Entity Registrant Name	PEAPACK GLADSTONE FINANCIAL CORP
Entity Central Index Key	0001050743
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		18,259,577
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2017
Trading Symbol	PGC