Retirement and Deferred Compensation Plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Retirement and Deferred Compensation Plans [Abstract]
401(k) plan description	PSB has established a 401(k) profit sharing plan for its employees. PSB matches 100% of employees' salary deferrals up to the first 1% of pay deferred and 50% of salary deferrals of the next 5% of pay deferrals, for a maximum match of 3.5% of salary. PSB also may declare a discretionary profit sharing contribution.
Expense recognized for contributions to the 401(k) plan	$ 521	$ 446	$ 509
Deferred compensation agreement description	PSB maintains deferred compensation agreements with certain executives and directors. PSB matches 20% of the amount of employees' salary deferrals up to the first 15% of pay deferred. PSB directors may elect to defer earned directors' fees into a separate deferred directors' fees plan. No PSB match is made on deferred directors' fees. Cumulative deferred balances earn a crediting rate generally equal to 100% of PSB's return on average equity until retirement or separation from service. The agreements provide for benefits to be paid in a lump sum at retirement or in monthly installments for a period up to 15 years following each participant's normal retirement date with interest payable at a fixed interest rate ranging from 7% to 8%.
Deferred compensation liability outstanding	3,427	3,155
Deferred compensation expense	$ 333	$ 270	$ 301