Mortgage Servicing Rights (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Mortgage Servicing Rights [Abstract]
Unpaid principal balances of residential mortgage loans	$ 279,865	$ 272,280

Total amount of unpaid principal on mortgage loans serviced for other investors.

No definition available.

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