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Commitments and Contingencies (Details Textual) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Long-term Purchase Commitment [Line Items]
Commitment To Contribute Capital	$ 13.4pacw_CommitmentToContributeCapital	$ 11.0pacw_CommitmentToContributeCapital
Private Equity Funds [Member]
Long-term Purchase Commitment [Line Items]
Purchase Commitment, Remaining Minimum Amount Committed	$ 2.8	$ 2.9
Number of funds	11	11

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

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