Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Schedule of significant unobservable inputs to measure fair value
Direct annual servicing cost per loan	$ 60psbq_DirectAnnualServicingCostPerLoan
Direct annual servicing cost per loan in process of foreclosure	$ 600
Weighted average prepayment speed: CPR	12.57%us-gaap_FairValueInputsPrepaymentRate
Weighted average prepayment speed: PSA	249.06%
Weighted average cash flow discount rate	7.91%us-gaap_FairValueInputsDiscountRate
Asset reinvestment rate	4.00%us-gaap_FairValueInputsCapRate
Short-term cost of funds	0.25%
Escrow inflation adjustment	1.00%
Servicing cost inflation adjustment	1.00%

The direct annual service cost per loan, used as an input to measure fair value.

No definition available.

Name:	psbq_DirectAnnualServicingCostPerLoan
Namespace Prefix:	psbq_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The direct annual service cost per loan that is in the process of foreclosure, used as an input to measure fair value.

+ References

No definition available.

+ Details

Name:	psbq_DirectAnnualServicingCostPerLoanInProcessOfForeclosure
Namespace Prefix:	psbq_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Rate utilized to adjust funds held in escrow by an inflation factor, used as an input to measure fair value.

+ References

No definition available.

+ Details

Name:	psbq_FairValueInputsEscrowInflationAdjustment
Namespace Prefix:	psbq_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Rate utilized to adjust servicing cost by an inflation factor, to present financial information on an inflation-adjusted basis, used as an input to measure fair value.

+ References

No definition available.

+ Details

Name:	psbq_FairValueInputsServicingCostInflationAdjustment
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Data Type:	num:percentItemType
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- Definition

The short-term interest rate for borrowing funds, used as an input to measure fair value.

+ References

No definition available.

+ Details

Name:	psbq_FairValueInputsShorttermCostOfFunds
Namespace Prefix:	psbq_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average Public Securities Association Standard Prepayment Model rate (PSA). The PSA is an assumed monthly rate of prepayment that is annualized to the outstanding principal balance of a mortgage loan, used as an input to measure fair value.

+ References

No definition available.

+ Details

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Namespace Prefix:	psbq_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_FairValueInputsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Ratio of the net operating income produced by an asset and its capital cost (original prices paid to buy the asset), used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueInputsCapRate
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Balance Type:	na
Period Type:	duration

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

+ Details

Name:	us-gaap_FairValueInputsDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value.

+ References

+ Details

Name:	us-gaap_FairValueInputsPrepaymentRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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Period Type:	duration