FDIC Loss Sharing Asset FDIC Loss Sharing Assets (Details Textuals)	3 Months Ended
Mar. 31, 2015
Schedule of FDIC Loss Sharing Asset [Line Items]
FDIC Indemnification rate on covered assets	80.00%
Recovery rate of assuming bank on covered assets	80.00%

Recovery rate of assuming bank on covered assets under FDIC loss-share arrangement

No definition available.

Name:	pacw_Recoveryrateofassumingbankoncoveredassets
Namespace Prefix:	pacw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration