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Fair Value Measurements (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Available-for-sale Securities [Abstract]    
Total securities available for sale $ 74,378us-gaap_AvailableForSaleSecurities $ 61,650us-gaap_AvailableForSaleSecurities
Loans held for sale 100us-gaap_LoansHeldForSaleFairValueDisclosure 150us-gaap_LoansHeldForSaleFairValueDisclosure
Mortgage rate lock commitments 6psbq_MortgageRateLockCommitments 14psbq_MortgageRateLockCommitments
Interest rate swap agreements 194us-gaap_OtherAssetsFairValueDisclosure 276us-gaap_OtherAssetsFairValueDisclosure
Total assets 74,678us-gaap_AssetsFairValueDisclosureRecurring 62,090us-gaap_AssetsFairValueDisclosureRecurring
Liabilities - Interest rate swap agreements 519us-gaap_LiabilitiesFairValueDisclosureRecurring 714us-gaap_LiabilitiesFairValueDisclosureRecurring
Quoted Prices in Active Markets for identical Assets [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale      
Loans held for sale      
Mortgage rate lock commitments      
Interest rate swap agreements      
Total assets      
Liabilities - Interest rate swap agreements      
Significant Other Observable Inputs (Level 2) [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale 74,331us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 61,603us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Loans held for sale 100us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 150us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Mortgage rate lock commitments 6psbq_MortgageRateLockCommitments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 14psbq_MortgageRateLockCommitments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Interest rate swap agreements 194us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 276us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Total assets 74,631us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 62,043us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Liabilities - Interest rate swap agreements 519us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 714us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Significant Unobservable Inputs (Level 3) [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale 47us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 47us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Loans held for sale      
Mortgage rate lock commitments      
Interest rate swap agreements      
Total assets 47us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 47us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Liabilities - Interest rate swap agreements      
Obligations of states and political subdivisions [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale   159us-gaap_AvailableForSaleSecurities
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Obligations of states and political subdivisions [Member] | Quoted Prices in Active Markets for identical Assets [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale     
Obligations of states and political subdivisions [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale   159us-gaap_AvailableForSaleSecurities
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Obligations of states and political subdivisions [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale     
U.S. agency issued residential MBS and CMO [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale 73,352us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= psbq_USAgencyIssuedResidentialMBSAndCMOMember		 59,390us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= psbq_USAgencyIssuedResidentialMBSAndCMOMember
U.S. agency issued residential MBS and CMO [Member] | Quoted Prices in Active Markets for identical Assets [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale      
U.S. agency issued residential MBS and CMO [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale 73,352us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= psbq_USAgencyIssuedResidentialMBSAndCMOMember		 59,390us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= psbq_USAgencyIssuedResidentialMBSAndCMOMember
U.S. agency issued residential MBS and CMO [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale      
Privately issued residential MBS and CMO [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale 29us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= psbq_CollateralizedDebtObligationsPrivateMember		 105us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= psbq_CollateralizedDebtObligationsPrivateMember
Privately issued residential MBS and CMO [Member] | Quoted Prices in Active Markets for identical Assets [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale      
Privately issued residential MBS and CMO [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale 29us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= psbq_CollateralizedDebtObligationsPrivateMember		 105us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= psbq_CollateralizedDebtObligationsPrivateMember
Privately issued residential MBS and CMO [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale      
Nonrated SBA loan fund [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale 950us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= psbq_NonratedSBALoanFundMember		 950us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= psbq_NonratedSBALoanFundMember
Nonrated SBA loan fund [Member] | Quoted Prices in Active Markets for identical Assets [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale      
Nonrated SBA loan fund [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale 950us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= psbq_NonratedSBALoanFundMember		 950us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= psbq_NonratedSBALoanFundMember
Nonrated SBA loan fund [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale      
Other equity securities [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale 47us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember		 47us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember
Other equity securities [Member] | Quoted Prices in Active Markets for identical Assets [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale      
Other equity securities [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale     
Other equity securities [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale 47us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember		 47us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember
U.S. Treasury and agency debentures [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale   999us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
U.S. Treasury and agency debentures [Member] | Quoted Prices in Active Markets for identical Assets [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale     
U.S. Treasury and agency debentures [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale   999us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
U.S. Treasury and agency debentures [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Available-for-sale Securities [Abstract]    
Total securities available for sale