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FDIC Loss Sharing Asset FDIC Loss Textual (Details) (Below threshold [Member], Affinity Bank [Member])
 12 Months Ended
Dec. 31, 2014
Below threshold [Member] | Affinity Bank [Member]
  
Schedule of FDIC Loss Sharing Asset [Line Items]  
FDIC Indemnification rate on covered assets 80.00%pacw_FDICIndemnificationrateoncoveredassets
/ pacw_FDICLossShareArrangementAxis
= pacw_AffinityBankMember
/ us-gaap_RangeAxis
= pacw_BelowthresholdMember