Loans (Details 7) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
With no related allowance recorded:
Recorded Investment	$ 9,303	$ 3,410	$ 5,474
With an allowance recorded:
Related allowance	2,108	2,434	3,178
Recorded Investment	6,472	9,029	11,745
Total
Recorded Investment	15,775	12,439	17,219
Average Recorded Investment	14,109	12,026	12,965
Interest income recognized	534	569	597
Commercial and Industrial
With no related allowance recorded:
Unpaid Principal	2,906	1,483
Recorded Investment	2,861	1,483
Average Recorded Investment	2,172	1,545
Interest income recognized	135	88
With an allowance recorded:
Unpaid Principal	2,231	3,626
Related allowance	1,112	1,287
Recorded Investment	1,999	2,339
Average Recorded Investment	2,813	2,777
Interest income recognized	43	62
Total
Unpaid Principal	5,137	519
Recorded Investment	4,860	3,822
Average Recorded Investment	4,985	4,322
Interest income recognized	178	150
Commercial Real Estate
With no related allowance recorded:
Unpaid Principal	2,555	1,103
Recorded Investment	2,376	1,103
Average Recorded Investment	1,740	2,405
Interest income recognized	85	194
With an allowance recorded:
Unpaid Principal	3,143	2,899
Related allowance	621	643
Recorded Investment	3,011	2,256
Average Recorded Investment	2,955	2,634
Interest income recognized	81	105
Total
Unpaid Principal	5,698	4,002
Recorded Investment	5,387	3,359
Average Recorded Investment	4,695	5,039
Interest income recognized	166	299
Commercial Construction and Development
With no related allowance recorded:
Unpaid Principal	1
Recorded Investment
Average Recorded Investment
Interest income recognized		33
With an allowance recorded:
Unpaid Principal	142	202
Related allowance	74	31
Recorded Investment	140	171
Average Recorded Investment	171	316
Interest income recognized	8	21
Total
Unpaid Principal	143	202
Recorded Investment	140	171
Average Recorded Investment	171	316
Interest income recognized	8	54
Agricultural
With no related allowance recorded:
Unpaid Principal
Recorded Investment
Average Recorded Investment
Interest income recognized
With an allowance recorded:
Unpaid Principal	152	154
Related allowance	55	40
Recorded Investment	152	114
Average Recorded Investment	153	57
Interest income recognized		10
Total
Unpaid Principal	152	154
Recorded Investment	152	114
Average Recorded Investment	153	57
Interest income recognized		10
Government
With no related allowance recorded:
Unpaid Principal	3,090
Recorded Investment	3,090
Average Recorded Investment	1,545
Interest income recognized	150
Total
Unpaid Principal	3,090
Recorded Investment	3,090
Average Recorded Investment	1,545
Interest income recognized	150
Residential Prime
With no related allowance recorded:
Unpaid Principal	979	824
Recorded Investment	866	824
Average Recorded Investment	845	493
Interest income recognized	14	9
With an allowance recorded:
Unpaid Principal	749	1,463
Related allowance	101	277
Recorded Investment	706	1,186
Average Recorded Investment	1,085	1,384
Interest income recognized	9	22
Total
Unpaid Principal	1,728	2,287
Recorded Investment	1,572	2,010
Average Recorded Investment	1,930	1,877
Interest income recognized	23	31
Residential HELOC
With no related allowance recorded:
Unpaid Principal	110
Recorded Investment	110
Average Recorded Investment	55
Interest income recognized	3	3
With an allowance recorded:
Unpaid Principal	412	506
Related allowance	119	126
Recorded Investment	400	380
Average Recorded Investment	453	259
Interest income recognized	5	15
Total
Unpaid Principal	522	506
Recorded Investment	510	380
Average Recorded Investment	508	259
Interest income recognized	8	18
Residential construction and development
With no related allowance recorded:
Unpaid Principal
Recorded Investment
Average Recorded Investment
Interest income recognized
With an allowance recorded:
Unpaid Principal	49	153
Related allowance	8	4
Recorded Investment	47	149
Average Recorded Investment	106	129
Interest income recognized	1	5
Total
Unpaid Principal	49	153
Recorded Investment	47	149
Average Recorded Investment	106	129
Interest income recognized	1	5
Consumer
With no related allowance recorded:
Unpaid Principal
Recorded Investment
Average Recorded Investment
Interest income recognized
With an allowance recorded:
Unpaid Principal	19	26
Related allowance	18	26
Recorded Investment	17
Average Recorded Investment	22	27
Interest income recognized		2
Total
Unpaid Principal	19	26
Recorded Investment	17
Average Recorded Investment	22	27
Interest income recognized		$ 2

Name:	PSBQ_TotalAbstract
Namespace Prefix:	PSBQ_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Name:	PSBQ_WithAllowanceRecordedAbstract
Namespace Prefix:	PSBQ_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	PSBQ_WithNoRelatedAllowanceRecordedAbstract
Namespace Prefix:	PSBQ_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5258-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953550-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of interest income, recognized on accrual basis, on financing receivables that are recognized as impaired, for which there is no related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of average investment of impaired financing receivables for which there is a related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of interest income, recognized on accrual basis, on financing receivables, for which there is a related allowance for credit losses and are recognized as impaired.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant