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LOANS (Schedule of Loans Modified as Troubled Debt Restructurings) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
N
Dec. 31, 2013
N
Dec. 31, 2012
N
Number of Contracts 9us-gaap_FinancingReceivableModificationsNumberOfContracts2 5us-gaap_FinancingReceivableModificationsNumberOfContracts2 5us-gaap_FinancingReceivableModificationsNumberOfContracts2
Pre-Modification Outstanding Recorded Investment $ 3,419us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 $ 5,760us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 $ 3,475us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Post-Modification Outstanding Recorded Investment 3,419us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 5,760us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 3,475us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Primary Residential Mortgages [Member]      
Number of Contracts 8us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pgc_PrimaryResidentialMortgagesMember
4us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pgc_PrimaryResidentialMortgagesMember
3us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pgc_PrimaryResidentialMortgagesMember
Pre-Modification Outstanding Recorded Investment 2,138us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pgc_PrimaryResidentialMortgagesMember
760us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pgc_PrimaryResidentialMortgagesMember
553us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pgc_PrimaryResidentialMortgagesMember
Post-Modification Outstanding Recorded Investment 2,138us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pgc_PrimaryResidentialMortgagesMember
760us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pgc_PrimaryResidentialMortgagesMember
553us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pgc_PrimaryResidentialMortgagesMember
Junior Lien Loan on Residence [Member]      
Number of Contracts     1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_JuniorLoansMember
Pre-Modification Outstanding Recorded Investment     274us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_JuniorLoansMember
Post-Modification Outstanding Recorded Investment     274us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_JuniorLoansMember
Investment Commercial Real Estate [Member]      
Number of Contracts 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateInvestmentMember
1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateInvestmentMember
1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateInvestmentMember
Pre-Modification Outstanding Recorded Investment 1,281us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateInvestmentMember
5,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateInvestmentMember
2,648us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateInvestmentMember
Post-Modification Outstanding Recorded Investment $ 1,281us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateInvestmentMember
$ 5,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateInvestmentMember
$ 2,648us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateInvestmentMember