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Loans (Details 8) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Loans on Non Accrual Status    
Loans on non accrual status $ 8,371us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus $ 7,340us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Commercial Real Estate [Member]    
Loans on Non Accrual Status    
Loans on non accrual status 3,505us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember		 4,103us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
Consumer Loan [Member]    
Loans on Non Accrual Status    
Loans on non accrual status 25us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 17us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Commercial and Industrial [Member]    
Loans on Non Accrual Status    
Loans on non accrual status 2,519us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= psbq_CommercialAndIndustrialMember		 1,575us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= psbq_CommercialAndIndustrialMember
Agricultural [Member]    
Loans on Non Accrual Status    
Loans on non accrual status 122us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= psbq_AgriculturalMember		 152us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= psbq_AgriculturalMember
Commercial construction and development [Member]    
Loans on Non Accrual Status    
Loans on non accrual status 18us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= psbq_CommercialConstructionMember		 17us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= psbq_CommercialConstructionMember
Residential Prime [Member]    
Loans on Non Accrual Status    
Loans on non accrual status 1,426us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= psbq_ResidentialPrimeMember		 1,059us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= psbq_ResidentialPrimeMember
Residential HELOC [Member]    
Loans on Non Accrual Status    
Loans on non accrual status 280us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= psbq_ResidentialHELOCMember		 387us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= psbq_ResidentialHELOCMember
Residential construction and development [Member]    
Loans on Non Accrual Status    
Loans on non accrual status $ 476us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= psbq_ResidentialConstructionDevelopmentMember		 $ 30us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= psbq_ResidentialConstructionDevelopmentMember