PSB Holdings, Inc. Acquisition of Marathon State Bank (Details Narrative) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Total fair value of assets acquired	$ 107,000
Cash purchase price	5,505
Marathon State Bank book equity ratio as percent of assets prior to acquisition	6.00%
Credit Markdown on Acquired Loan Portfolio	490
Credit Markdown on Acquired Loan Portfolio, percentage	2.05%
Impaired Loans
Credit Markdown on Acquired Loan Portfolio	21
Purchased Impaired Loan Balance	$ 310

The book equity ratio to a percentage of total assets.

No definition available.

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Namespace Prefix:	PSBQ_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Credit markdown recorded to write down acquired loans on purchase date.

+ References

No definition available.

+ Details

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Namespace Prefix:	PSBQ_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Credit markdown recorded to write down acquired loans on purchase date. Specifically, the percentage of the markdown against loan principal.

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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

- Definition

The amount of acquisition cost of a business combination allocated to assets acquired.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 37

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant