GOODWILL AND OTHER INTANGIBLE ASSETS (Details)	3 Months Ended
Mar. 31, 2014
GOODWILL AND OTHER INTANGIBLE ASSETS
Remaining weighted average amortization period	2 years 7 months 6 days

Represents the remaining weighted average amortization period of finite-lived intangible assets.

No definition available.

Name:	pacw_FiniteLivedIntangibleAssetAmortizationPeriodRemaining
Namespace Prefix:	pacw_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration