Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	May 02, 2019
Document And Entity Information [Abstract]
Entity Registrant Name	PEAPACK GLADSTONE FINANCIAL CORP
Entity Central Index Key	0001050743
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		19,446,363
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2019
Trading Symbol	PGC