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Securities (Details Textual) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2010
Securities [Abstract]        
Securities Pledged as Collateral $ 46,368us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral $ 47,593us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral    
Realized gain on sale of securities available for sale (3)us-gaap_AvailableForSaleSecuritiesGrossRealizedGains (12)us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGains  
Realized gain on sale of securities available for sale after tax 2us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet 7us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet    
Proceeds from sale of securities available for sale 1,774us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 986us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 0us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities  
Reclassification of comprehensive income on sale of securities available for sale 3us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax 12us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax    
Reclassification of comprehensive income on sale of securities available for sale after tax 2us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax 7us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax  
Reduction to comprehensive net income recognized as gain on sale of securities 3us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesBeforeTax 12us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesBeforeTax    
Reduction to comprehensive net income recognized as gain on sale of securities after tax 2us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax 7us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax    
Fair value of securities transferred from available-for-sale to held-to-maturity       54,130psbq_AvailableForSaleSecuritiesTransfersToHeldToMaturity
Unrealized gain over amortized cost basis       2,552psbq_UnrealizedGainOverAmortizedCostBasis
Comprehensive income before tax 330us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesBeforeTax 430us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesBeforeTax 452us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesBeforeTax  
Comprehensive income after tax $ 200us-gaap_OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax $ 236us-gaap_OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax $ 274us-gaap_OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax  
Debt securities, Description At December 31, 2014, 76 debt securities had unrealized losses with aggregate depreciation of 1.90% from the amortized cost basis, compared to 167 debt securities which had unrealized losses with aggregate depreciation of 3.36% from the amortized cost basis at December 31, 2013.