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Note 5 - Premises and Equipment (Details) - Summary of Premises and Equipment (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 32,951us-gaap_PropertyPlantAndEquipmentGross $ 25,338us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated depreciation and amortization (10,594)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (10,277)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Premises and Equipment, net 22,357pnbk_PropertyPlantAndEquipmentIncludingAssetHeldForSaleNet 15,061pnbk_PropertyPlantAndEquipmentIncludingAssetHeldForSaleNet
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 5,150us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
6,060us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
Furniture, Equipment and Software [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 7,216us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= pnbk_FurnitureEquipmentAndSoftwareMember
6,981us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= pnbk_FurnitureEquipmentAndSoftwareMember
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 10,419us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
7,341us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Building [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 10,166us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
$ 4,956us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember