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LOANS AND LEASES (Summary of Information Related to Modification) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Amortized Cost Basis at Period End	$ 248
% of Total Class of Financing Receivable	0.02%
Interest Rate Reduction [Member]
Amortized Cost Basis at Period End	$ 3,077
% of Total Class of Financing Receivable	0.23%
Commercial and Industrial [Member] | Commercial Portfolio Segment [Member]
Amortized Cost Basis at Period End	$ 248
% of Total Class of Financing Receivable	0.02%
Commercial and Industrial [Member] | Commercial Portfolio Segment [Member] | Interest Rate Reduction [Member]
Amortized Cost Basis at Period End	$ 3,077
% of Total Class of Financing Receivable	0.23%

X

- Definition

Financial receivable modifications post modification recorded investment.

+ References

No definition available.

+ Details

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Namespace Prefix:	pgc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-42

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481933/310-10-55-12A

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