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Merger and Acquisition Activity (Details 2) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Pro Forma with Marathon State Bank  
Net Interest Income $ 20,828psbq_BusinessAcquisitionsProFormaNetInterestIncome
Noninterest Income 6,586psbq_BusinessAcquisitionsProFormaNonInterestIncome
Net Income 6,055us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Earnings Per Share $ 3.64us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
PSB Holdings, Inc.[Member]  
Pro Forma with Marathon State Bank  
Net Interest Income 19,670psbq_BusinessAcquisitionsProFormaNetInterestIncome
/ us-gaap_BusinessAcquisitionAxis
= psbq_PsbHoldingsMember
Noninterest Income 5,706psbq_BusinessAcquisitionsProFormaNonInterestIncome
/ us-gaap_BusinessAcquisitionAxis
= psbq_PsbHoldingsMember
Net Income 5,587us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= psbq_PsbHoldingsMember
Earnings Per Share $ 3.36us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
/ us-gaap_BusinessAcquisitionAxis
= psbq_PsbHoldingsMember
Marathon State Bank [Member]  
Pro Forma with Marathon State Bank  
Net Interest Income 1,158psbq_BusinessAcquisitionsProFormaNetInterestIncome
/ us-gaap_BusinessAcquisitionAxis
= psbq_MarathonStateBankMember
Noninterest Income 880psbq_BusinessAcquisitionsProFormaNonInterestIncome
/ us-gaap_BusinessAcquisitionAxis
= psbq_MarathonStateBankMember
Net Income $ 468us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= psbq_MarathonStateBankMember
Earnings Per Share $ 0.28us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
/ us-gaap_BusinessAcquisitionAxis
= psbq_MarathonStateBankMember