Pending Acquisition of San Diego Trust Bank (Details) (USD $)							0 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2013 San Diego Trust Bank	Mar. 05, 2013 San Diego Trust Bank	Mar. 05, 2013 San Diego Trust Bank Merger agreement	Mar. 05, 2013 San Diego Trust Bank Merger agreement Minimum	Mar. 05, 2013 San Diego Trust Bank Merger agreement Maximum
Pending Acquisition of San Diego Trust Bank
Total assets	$ 1,406,655,000	$ 1,173,792,000	$ 985,171,000		$ 210,900,000
Total Stockholders' Equity	157,589,000	134,517,000	89,479,000	86,777,000	25,500,000
Total deposits	1,185,719,000	904,768,000	846,717,000		182,300,000
Consideration for merger transaction						30,600,000
Share price per share in cash that the acquired entity's shareholder will receive for each share of acquiree (in dollars per share)							$ 13.41
Number of shares of the entity that the acquired entity's shareholder will receive for each share of acquiree							1.114
Consideration in the form of cash (as a percent)							50.00%
Consideration in the form of PPBI stock (as a percent)							50.00%
Threshold limit of transaction expenses that will effect the cash consideration, after-tax basis							$ 3,000,000
Period ending on the fifth day prior to the transaction for which average closing price is considered to calculate value of shares to be issued							10 days
Stock price of the acquired entity								$ 10.83	$ 13.24
Maximum percentage of outstanding share that can be issued upon acquisition							19.90%