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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Threshold for determining nonaccrual status 90 days    
Effect of change in method   $ 1,000,000us-gaap_FinancingReceivableAllowanceForCreditLossesEffectOfChangeInMethod  
Number of share purchase rights authorized 820,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized    
Antidilutive securities 167,004us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 478,389us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 546,950us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Cash dividends declared on common stock, per share $ 0.20us-gaap_CommonStockDividendsPerShareDeclared $ 0.20us-gaap_CommonStockDividendsPerShareDeclared $ 0.20us-gaap_CommonStockDividendsPerShareDeclared
Substandard [Member]      
Loan reserve multiple 5pgc_FinancingReceivablesReserveMultiple
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
   
Special Mention [Member]      
Loan reserve multiple 2.5pgc_FinancingReceivablesReserveMultiple
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
   
Commercial Portfolio Segment [Member]      
Threshold for determining nonaccrual status 120 days    
Employee Stock Option [Member]      
Option term 10 years    
Compensation cost 234,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
319,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
336,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Employee Stock [Member]      
Number of share purchase rights authorized 150,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
   
Percentage of closing market price on purchase date 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
   
Compensation cost $ 49,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
   
Issuance of shares for Employee Stock Purchase Plan, shares 10,698us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
   
Employee Stock [Member] | Minimum [Member]      
Percentage of compensation contributable 1.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Employee Stock [Member] | Maximum [Member]      
Percentage of compensation contributable 15.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Equipment [Member] | Minimum [Member]      
Useful life 3 years    
Equipment [Member] | Maximum [Member]      
Useful life 10 years    
Premises [Member]      
Useful life 40 years