Loans (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction [Line Items]
Specific loan reserves for loans restructured	$ 591psbq_SpecificLoanReserves	$ 258psbq_SpecificLoanReserves
Loans receivable credit in excess	500
Loans and leases receivable, related parties	6,980	6,663	7,371
Loans on non accrual status	8,371	7,340
Proceeds from Lines of Credit	204us-gaap_ProceedsFromLinesOfCredit	201us-gaap_ProceedsFromLinesOfCredit
Modified loan principal restructured to capitalize unpaid property taxes	1,445	1,272
Modified loan principal restructured to capitalize unpaid property taxes, percentage	25.00%	52.00%
Modified loan principal to extend amortization or lower existing interest rates	4,452	1,194
Modified loan principal to extend amortization or lower existing interest rates, percentage	75.00%	48.00%
Specific Loan Reserves	591psbq_SpecificLoanReserves	258psbq_SpecificLoanReserves
Restructured payments description	When the default occurred within 12 months of the last restructuring date. For purposes of this table, default is defined as 90 days or more past due on restructured payments.	When the default occurred within 12 months of the last restructuring date. For purposes of this table, default is defined as 90 days or more past due on restructured payments.
Percentage of original loan principal	1.00%
commercial real estate loans	3,137	5,202
Purchased commercial real estate loans	22,404	27,404
Principal amount of residental loan	18,834psbq_ResidentalLoanPrincipalAmount
Maximum guarntees of PSB obligation	949psbq_MaximumGuarntees
Approximate amount of loan	1,412psbq_ForeclosureLosses
Related Party [Member]
Related Party Transaction [Line Items]
Loans and leases receivable, related parties	$ 5,723	$ 4,595

Secondary market investor first loss account .

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Maximum guarntees.

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Value of modified loan principal converted to capitalize unpaid property taxes.

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Percentage of modified loan principal converted to capitalize unpaid property taxes.

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Percentage of modified loan principal converted to extend amortization periods or to lower the existing interest rate.

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Residental loan principal amount.

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The amount of loan reserves maintained in connection with loans restructured during the year to date.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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Amount before allowance of commercial loans to acquire real property. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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