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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS [Abstract]    
Advances from Federal Home Loan Banks $ 83,692,000us-gaap_AdvancesFromFederalHomeLoanBanks $ 74,700,000us-gaap_AdvancesFromFederalHomeLoanBanks
Federal Home Loan Bank advances, weighted average interest rate (in percent) 1.78%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankWeightedAverageInterestRate 1.80%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankWeightedAverageInterestRate
Advances with fixed maturity dates 71,700,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRate 62,700,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRate
Weighted average interest rate on fixed maturity advances 1.57%pgc_FixedMaturityFederalHomeLoanBankAdvancesBranchOfFHLBBankFixedInterestRate 1.57%pgc_FixedMaturityFederalHomeLoanBankAdvancesBranchOfFHLBBankFixedInterestRate
Residential mortgages pledged as collateral for advances 388,500,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1 449,900,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
Multifamily mortgage loans pledged as collateral for advances 815,600,000pgc_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged3  
Callable variable rate advances 12,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFloatingRate 12,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFloatingRate
Weighted average interest rate on variable advances (in percent) 3.01%pgc_FloatingFederalHomeLoanBankAdvancesBranchOfFHLBBankFixedInterestRate 3.01%pgc_FloatingFederalHomeLoanBankAdvancesBranchOfFHLBBankFixedInterestRate
Investment pledges against advances 13,400,000pgc_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged2 13,300,000pgc_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged2
Overnight borrowings of debt 54,600,000us-gaap_ShortTermBorrowings 54,900,000us-gaap_ShortTermBorrowings
Average interest rate of FHLB advances 0.32%us-gaap_FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateForYear 0.40%us-gaap_FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateForYear
Unused commitments from FHLB 672,400,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds  
Unused short-term or overnight borrowings from correspondent banks $ 28,400,000pgc_OvernightDebtUnusedBorrowingUnusedCapacityAmount