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BENEFIT PLANS - Additional Information (Details) - 401(K) Plan [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Company contribution percentage of compensation for each employee		2.00%	0.00%
Contributions to the plan	$ 3.7	$ 2.9	$ 1.7
Defined Contribution Plan partially match Employee Contribution Percent	3.00%

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- Definition

Defined contribution plan, employer discretionary contribution, percent.

+ References

No definition available.

+ Details

Name:	pgc_DefinedContributionPlanEmployerDiscretionaryContributionPercent
Namespace Prefix:	pgc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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- Definition

Defined contribution plan partially match employee contribution percent.

+ References

No definition available.

+ Details

Name:	pgc_DefinedContributionPlanPartiallyMatchEmployeeContributionPercent
Namespace Prefix:	pgc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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- Definition

Amount of contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with deferred compensation arrangement.

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Details

Name:	us-gaap_RetirementPlanNameAxis=pgc_Retirement401KPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: