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Merger and Acquisition Activity (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Jun. 14, 2012
Apr. 11, 2014
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]      
Cash and due from banks $ 20,392us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents    
Loans receivable, including accrued interest 23,760psbq_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsLoansReceivables    
Premises and equipment 402us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment    
Core deposit intangible 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles    
Total fair value of assets acquired   107,364us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets  
Fair value of liabilities assumed:      
Non-interest bearing deposits 23,255psbq_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNonInterestBearingDeposits    
Fair value of liabilities assumed 101,008us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities    
Northwoods National Bank [Member]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]      
Cash and due from banks     17,741us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= psbq_NorthwoodsNationalBankMember
Loans receivable, including accrued interest     21,365psbq_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsLoansReceivables
/ us-gaap_BusinessAcquisitionAxis
= psbq_NorthwoodsNationalBankMember
Premises and equipment     1,368us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= psbq_NorthwoodsNationalBankMember
Core deposit intangible     231us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= psbq_NorthwoodsNationalBankMember
Goodwill     113psbq_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedGoodwill
/ us-gaap_BusinessAcquisitionAxis
= psbq_NorthwoodsNationalBankMember
Total fair value of assets acquired     40,818us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= psbq_NorthwoodsNationalBankMember
Fair value of liabilities assumed:      
Non-interest bearing deposits     3,890psbq_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNonInterestBearingDeposits
/ us-gaap_BusinessAcquisitionAxis
= psbq_NorthwoodsNationalBankMember
Interest-bearing deposits, including accrued interest     36,912psbq_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInterestBearingDeposits
/ us-gaap_BusinessAcquisitionAxis
= psbq_NorthwoodsNationalBankMember
Other liabilities     16psbq_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherLiabilities
/ us-gaap_BusinessAcquisitionAxis
= psbq_NorthwoodsNationalBankMember
Fair value of liabilities assumed     $ 40,818us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= psbq_NorthwoodsNationalBankMember