Securities (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Amortization Of Remaining Unrealized Gain On Debt Securities [Abstract]
2015	$ 274
2016	194
2017	115
2018	68
2019	22
Thereafter	22
Total	$ 695

Amortization of remaining unrealized gain on debt securities.

No definition available.

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

Name:	psbq_AmortizationOfRemainingUnrealizedGainOnDebtSecuritiesAbstract
Namespace Prefix:	psbq_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amortization of remaining unrealized gain on debt securities next twelve months.

No definition available.

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

Amortization of remaining unrealized gain on debt securities thereafter.

No definition available.

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

Amortization of remaining unrealized gain on debt securities year five.

No definition available.

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

Amortization of remaining unrealized gain on debt securities year four.

No definition available.

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

Amortization of remaining unrealized gain on debt securities year three.

No definition available.

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

Amortization of remaining unrealized gain on debt securities year two.

No definition available.

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