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COMMITMENTS AND CONTINGENCIES - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Commitments to Extend Credit [Member]
Commitment And Contingencies [Line Items]
Commitments to extend credit	$ 1,200.0	$ 1,100.0
Standby Letters of Credit [Member]
Commitment And Contingencies [Line Items]
Commitments to extend credit	28.3	23.3
SBIC [Member]
Commitment And Contingencies [Line Items]
Unfunded commitment for investment	$ 9.4	$ 10.3

X

- Definition

Commitment and contingencies.

+ References

No definition available.

+ Details

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Namespace Prefix:	pgc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Unfunded commitment for investment.

+ References

No definition available.

+ Details

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

X

- Definition

The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=pgc_SmallBusinessInvestmentCompanyMember
Namespace Prefix:
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Period Type: