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LOANS - (Summary of Information Related to Modification) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Interest Rate Reduction [Member]
Amortized Cost Basis at Period End		$ 3,006
% of Total Class of Financing Receivable		0.23%
Significant Payment Delay [Member]
Amortized Cost Basis at Period End	$ 1,219	$ 248
% of Total Class of Financing Receivable	0.15%	0.02%
Contractual Interest Rate Reduction Term Extension [Member]
Amortized Cost Basis at Period End	$ 12,138
% of Total Class of Financing Receivable	0.81%
Significant Payment Delay and Term Extension [Member]
Amortized Cost Basis at Period End	$ 33,138
% of Total Class of Financing Receivable	2.85%
Commercial Portfolio Segment [Member] | Significant Payment Delay and Term Extension [Member] | Investment Property [Member]
Amortized Cost Basis at Period End	$ 17,838
% of Total Class of Financing Receivable	1.82%
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Interest Rate Reduction [Member]
Amortized Cost Basis at Period End		$ 3,006
% of Total Class of Financing Receivable		0.23%
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Significant Payment Delay [Member]
Amortized Cost Basis at Period End	$ 571	$ 248
% of Total Class of Financing Receivable	0.04%	0.02%
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Contractual Interest Rate Reduction Term Extension [Member]
Amortized Cost Basis at Period End	$ 12,138
% of Total Class of Financing Receivable	0.81%
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Significant Payment Delay and Term Extension [Member]
Amortized Cost Basis at Period End	$ 15,300
% of Total Class of Financing Receivable	1.03%
Residential Portfolio Segment [Member] | Significant Payment Delay [Member] | Primary Residential Mortgages [Member]
Amortized Cost Basis at Period End	$ 648
% of Total Class of Financing Receivable	0.11%

X

- Definition

Financial receivable modifications post modification recorded investment.

+ References

No definition available.

+ Details

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Namespace Prefix:	pgc_
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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/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

Reference 2: 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

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