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Derivative Instruments and Hedging Activities (Details Textual) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Derivative Instruments and Hedging Activities [Abstract]      
Unrealized fair value gain (loss) $ 325us-gaap_DerivativeGainLossOnDerivativeNet    
Unrealized gain (loss) on interest rate swap (44)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 46us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax (179)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Percentage of Hedging 100.00%us-gaap_GeneralFairValueHedgeInformationDollarOffsetThresholdMaximum    
Unrealized loss reported in other comprehensive income related to the interest rate swap, gross 176psbq_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferredBeforeTax    
Reclassification adjustment of interest rate swap settlements included in earnings, income tax (114)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax (113)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax (104)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Unrealized loss reported in other comprehensive income related to the interest rate swap, estimate of time to transfer 12 months    
Interest rate swap agreement, secured cash and cash equivalents 430psbq_InterestRateSwapCollateralCash 570psbq_InterestRateSwapCollateralCash  
Reclassification adjustment of interest rate swap settlements included in earnings (188)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax (186)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax (172)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
Reclassification from accumulated ocito income estimated net amount to be transferred net of tax 107psbq_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOcitoIncomeEstimatedNetAmountToBeTransferredNetOfTax    
Reclassification interest rate settlement from net of tax 188psbq_OtherComprehensiveIncomeLossReclassificationInterestRateSettlementFromAocionDerivativesNetOfTax 186psbq_OtherComprehensiveIncomeLossReclassificationInterestRateSettlementFromAocionDerivativesNetOfTax  
Reclassification interest rate settlement from net after tax $ 114psbq_OtherComprehensiveIncomeLossReclassificationInterestRateSettlementFromAocionDerivativesNetAfterTax $ 113psbq_OtherComprehensiveIncomeLossReclassificationInterestRateSettlementFromAocionDerivativesNetAfterTax