Document and Entity Information	3 Months Ended
	Mar. 31, 2013	May 01, 2013
Document and Entity Information
Entity Registrant Name	PACWEST BANCORP
Entity Central Index Key	0001102112
Document Type	10-Q
Document Period End Date	Mar. 31, 2013
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		35,867,862
Entity Common Stock, Shares Outstanding Unvested Restricted		1,498,495
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q1