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OTHER REAL ESTATE OWNED (Schedule of Activity in Valuation Allowance) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other Real Estate [Abstract] |  |  |
Balance, beginning of year |  | $ 2,670 | $ 2,420
Additions charged to expense |  |  | 250
Direct writedowns |  | (2,670) |
Balance, end of year |  |  | $ 2,670

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- Definition The valuation allowance related to other real estate owned. + References No definition available. + Details
Name: | pgc_ValuationAllowanceRealEstateOwned
Namespace Prefix: | pgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Additions to other real estate owned charged to expense, as a component of the valuation allowance. + References No definition available. + Details
Name: | pgc_ValuationAllowanceRealEstateOwnedAdditionsChargedToExpense
Namespace Prefix: | pgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Direct writedowns of other real estate owned, as a component of the valuation allowance. + References No definition available. + Details
Name: | pgc_ValuationAllowanceRealEstateOwnedDirectWritedowns
Namespace Prefix: | pgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_OtherRealEstateAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration