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Fair Value Measurements (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Assets measured at fair value on a non recurring basis        
Impaired loans $ 1,956psbq_LoansReceivableImpairedFairValueDisclosure $ 1,720psbq_LoansReceivableImpairedFairValueDisclosure    
Foreclosed assets 1,661us-gaap_ForeclosedAssets 1,750us-gaap_ForeclosedAssets 1,774us-gaap_ForeclosedAssets 2,939us-gaap_ForeclosedAssets
Mortgage servicing rights 1,738us-gaap_ServicingAssetAtFairValueAmount 1,696us-gaap_ServicingAssetAtFairValueAmount    
Other intangible assets 274us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure      
Total assets 5,629us-gaap_AssetsFairValueDisclosureNonrecurring 5,166us-gaap_AssetsFairValueDisclosureNonrecurring    
Quoted Prices in Active Markets for identical Assets [Member]        
Assets measured at fair value on a non recurring basis        
Impaired loans          
Foreclosed assets          
Mortgage servicing rights          
Other intangible assets         
Total assets          
Significant Other Observable Inputs (Level 2) [Member]        
Assets measured at fair value on a non recurring basis        
Impaired loans 97psbq_LoansReceivableImpairedFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
      
Foreclosed assets 284us-gaap_ForeclosedAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
792us-gaap_ForeclosedAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Mortgage servicing rights 0us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
      
Other intangible assets 0us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
     
Total assets 381us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
792us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Significant Unobservable Inputs (Level 3) [Member]        
Assets measured at fair value on a non recurring basis        
Impaired loans 1,859psbq_LoansReceivableImpairedFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
1,720psbq_LoansReceivableImpairedFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Foreclosed assets 1,377us-gaap_ForeclosedAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
958us-gaap_ForeclosedAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Mortgage servicing rights 1,738us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
1,696us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Other intangible assets 274us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
     
Total assets $ 5,248us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
$ 4,374us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member