ACQUISITIONS (Details 2) (USD $)						0 Months Ended	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	May 31, 2013 First California Financial Group	Mar. 31, 2014 First California Financial Group Pacific Western Bank item	Mar. 31, 2014 First California Financial Group FCB item
Acquisitions
Number of shares of entity receivable by stockholders of acquiree for each share of acquiree						0.2966
Measuring period for determining weighted average price per share for fluctuating shares						20 days
Issuance of common stock (in shares)						8,400,000
Common stock of acquiree cancelled in merger (in shares)						1,094,000
Cost of common stock of acquiree cancelled in merger						$ 4,100,000
Closing price of common stock (in dollars per share)						$ 28.83
Realized gain after the acquisition						5,200,000
Total consideration paid						251,568,000
Number of operating branches								15
Number of locations added to branch network as a result of integration and consolidation plan							7
Goodwill	$ 208,743,000	$ 208,743,000	$ 215,862,000	$ 79,673,000	$ 79,866,000	$ 129,070,000