STOCK-BASED COMPENSATION (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Compensation Expense Schedule Assuming all RSUs Vest
Compensation expense 2013	$ 146
Compensation expense 2014	146
Compensation expense 2015	137
Compensation expense 2016	122
Compensation expense 2017	82
Thereafter	42
Compensation expense, total	$ 675

The total of future share-based compensation of vested RSUs.

No definition available.

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Namespace Prefix:	PSBQ_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Share-based compensation expense in excess of one year, within one year of the balance sheet date relating to restricted shares that vest to employees.

+ References

No definition available.

+ Details

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Namespace Prefix:	PSBQ_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Share-based compensation expense within fifth year of the balance sheet date relating to restricted shares that vest to employees.

+ References

No definition available.

+ Details

Name:	PSBQ_CompensationExpenseFutureMinimumPaymentsDueInFiveYears
Namespace Prefix:	PSBQ_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Share-based compensation expense within fourth year of the balance sheet date relating to restricted shares that vest to employees.

+ References

No definition available.

+ Details

Name:	PSBQ_CompensationExpenseFutureMinimumPaymentsDueInFourYears
Namespace Prefix:	PSBQ_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Share-based compensation expense within third year of the balance sheet date relating to restricted shares that vest to employees.

+ References

No definition available.

+ Details

Name:	PSBQ_CompensationExpenseFutureMinimumPaymentsDueInThreeYears
Namespace Prefix:	PSBQ_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Share-based compensation expense within second year of the balance sheet date relating to restricted shares that vest to employees.

+ References

No definition available.

+ Details

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Namespace Prefix:	PSBQ_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Share-based compensation expense after the fifth year after the nearest balance sheet date relating to restricted shares that vest to employees.

+ References

No definition available.

+ Details

Name:	PSBQ_CompensationExpenseFutureMinimumPaymentsDueThereafter
Namespace Prefix:	PSBQ_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration