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LOANS AND LEASES - (Schedule of Loans Modifications as Subsequent Default, By Payment Status (Details) - Not Past Due [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Loans modified	$ 248
Commercial and Industrial [Member] | Consumer Loan [Member]
Loans modified	$ 248

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- Definition

Financing receivable excluding accrued interest modified in period amount.

+ References

No definition available.

+ Details

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

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_EquitySecuritiesByIndustryAxis=us-gaap_CommercialAndIndustrialSectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ConsumerLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: