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PREMISES AND EQUIPMENT (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Depreciation expense $ 2,993us-gaap_Depreciation $ 3,536us-gaap_Depreciation $ 2,946us-gaap_Depreciation  
Depreciation expense on leased assets 531us-gaap_CapitalLeasesIncomeStatementAmortizationExpense 400us-gaap_CapitalLeasesIncomeStatementAmortizationExpense 400us-gaap_CapitalLeasesIncomeStatementAmortizationExpense  
Gain on leaseback transaction of Gladstone property deferred       764us-gaap_SaleLeasebackTransactionDeferredGainGross
Gladstone Property [Member]        
Depreciation expense $ 141us-gaap_Depreciation
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= pgc_GladestoneMember
$ 141us-gaap_Depreciation
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= pgc_GladestoneMember
$ 141us-gaap_Depreciation
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= pgc_GladestoneMember