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OTHER REAL ESTATE OWNED (Schedule of Activity in Valuation Allowance) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Real Estate [Abstract]
Balance, beginning of year	$ 0	$ 0	$ 0
Additions charged to expense	0	0	232
Direct writedowns	0	0	(232)
Balance, end of year	$ 0	$ 0	$ 0

X

- Definition

The valuation allowance related to other real estate owned.

+ References

No definition available.

+ Details

Name:	pgc_ValuationAllowanceRealEstateOwned
Namespace Prefix:	pgc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Additions to other real estate owned charged to expense, as a component of the valuation allowance.

+ References

No definition available.

+ Details

Name:	pgc_ValuationAllowanceRealEstateOwnedAdditionsChargedToExpense
Namespace Prefix:	pgc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Direct writedowns of other real estate owned, as a component of the valuation allowance.

+ References

No definition available.

+ Details

Name:	pgc_ValuationAllowanceRealEstateOwnedDirectWritedowns
Namespace Prefix:	pgc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_OtherRealEstateAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration