OTHER REAL ESTATE OWNED (Schedule of Activity in Other Real Estate Owned, Excluding Valuation Allowance) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Other Real Estate [Abstract]
Balance, beginning of year	$ 50	$ 0
OREO properties added	0	386
Sales during year	0	(336)
Balance, end of year	$ 50	$ 50

Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure. Gross of valuation allowance.

No definition available.

Name:	pgc_OtherRealEstateGross
Namespace Prefix:	pgc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant