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Commitments, Contingencies, and Credit Risk (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Commitments $ 123,912us-gaap_CommitmentsAndContingencies $ 119,443us-gaap_CommitmentsAndContingencies
Commitments to extend credit - Fixed and variable rates [Member]    
Commitments 91,206us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
89,645us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
Commercial standby letters of credit -Variable rate [Member]    
Commitments 2,388us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinancialStandbyLetterOfCreditMember
4,533us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinancialStandbyLetterOfCreditMember
Unused home equity lines of credit - Variable rate[Member]    
Commitments 29,034us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= us-gaap_UnusedLinesOfCreditMember
24,082us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= us-gaap_UnusedLinesOfCreditMember
Unused credit card commitments - Variable rate [Member]    
Commitments 335us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= psbq_UnusedCreditCardCommitmentsMember
234us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= psbq_UnusedCreditCardCommitmentsMember
Mortgage Partnership Finance program [Member]    
Commitments $ 949us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CollateralizedMortgageObligationsMember
$ 949us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CollateralizedMortgageObligationsMember