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BENEFIT PLANS - Additional Information (Details) - 401(K) Plan [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Company contribution percentage of compensation for each employee | 2.00% | 3.00% | 3.00%
Contributions to the plan | $ 1.7 | $ 2.2 | $ 1.6

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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: | num: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: |