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Business Segment Business Segments (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Apr. 07, 2014
Loans and Leases Receivable, Net of Deferred Income $ 12,272,166us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome $ 11,882,432us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome $ 4,161,067us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome  
Loans and Leases Receivable, Allowance (92,378)us-gaap_LoansAndLeasesReceivableAllowance   (81,180)us-gaap_LoansAndLeasesReceivableAllowance  
Total loans and leases, net 12,179,788us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered 11,797,977us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered 4,079,887us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered  
Goodwill 1,728,380us-gaap_Goodwill [1] 1,720,479us-gaap_Goodwill 208,743us-gaap_Goodwill  
Core deposit and customer relationship intangibles, net 15,703pacw_FiniteLivedCoreDepositsCustomerRelationsNet 17,204pacw_FiniteLivedCoreDepositsCustomerRelationsNet 15,884pacw_FiniteLivedCoreDepositsCustomerRelationsNet  
Total assets 16,643,940us-gaap_Assets 16,234,605us-gaap_Assets 6,517,853us-gaap_Assets  
Total deposits 11,934,175us-gaap_Deposits 11,755,128us-gaap_Deposits 5,369,408us-gaap_Deposits  
Operating Segments [Member] | Community Banking Segment [Member]        
Loans and Leases Receivable, Net of Deferred Income 3,349,928us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_CommunityBankingSegmentMember
  3,707,308us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_CommunityBankingSegmentMember
 
Loans and Leases Receivable, Allowance (40,906)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_CommunityBankingSegmentMember
  (74,833)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_CommunityBankingSegmentMember
 
Total loans and leases, net 3,309,022us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_CommunityBankingSegmentMember
  3,632,475us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_CommunityBankingSegmentMember
 
Goodwill 333,979us-gaap_Goodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_CommunityBankingSegmentMember
[1]   183,065us-gaap_Goodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_CommunityBankingSegmentMember
 
Core deposit and customer relationship intangibles, net 14,918pacw_FiniteLivedCoreDepositsCustomerRelationsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_CommunityBankingSegmentMember
  14,139pacw_FiniteLivedCoreDepositsCustomerRelationsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_CommunityBankingSegmentMember
 
Total assets 6,553,028us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_CommunityBankingSegmentMember
  5,990,162us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_CommunityBankingSegmentMember
 
Total deposits 12,252,851us-gaap_Deposits
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_CommunityBankingSegmentMember
  5,415,691us-gaap_Deposits
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_CommunityBankingSegmentMember
 
Operating Segments [Member] | National Lending Segment [Member]        
Loans and Leases Receivable, Net of Deferred Income 8,898,843us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_NationalLendingSegmentMember
  453,759us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_NationalLendingSegmentMember
 
Loans and Leases Receivable, Allowance (51,472)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_NationalLendingSegmentMember
  (6,347)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_NationalLendingSegmentMember
 
Total loans and leases, net 8,847,371us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_NationalLendingSegmentMember
  447,412us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_NationalLendingSegmentMember
 
Goodwill 1,394,401us-gaap_Goodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_NationalLendingSegmentMember
[1]   25,678us-gaap_Goodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_NationalLendingSegmentMember
 
Core deposit and customer relationship intangibles, net 785pacw_FiniteLivedCoreDepositsCustomerRelationsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_NationalLendingSegmentMember
  1,745pacw_FiniteLivedCoreDepositsCustomerRelationsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_NationalLendingSegmentMember
 
Total assets 9,905,563us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_NationalLendingSegmentMember
  517,126us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_NationalLendingSegmentMember
 
Total deposits 35,847us-gaap_Deposits
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_NationalLendingSegmentMember
  0us-gaap_Deposits
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= pacw_NationalLendingSegmentMember
 
Operating Segments [Member] | Other Segments [Member]        
Loans and Leases Receivable, Net of Deferred Income 23,395us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
  0us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
 
Loans and Leases Receivable, Allowance 0us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
  0us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
 
Total loans and leases, net 23,395us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
  0us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
 
Goodwill 0us-gaap_Goodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
[1]   0us-gaap_Goodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
 
Core deposit and customer relationship intangibles, net 0pacw_FiniteLivedCoreDepositsCustomerRelationsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
  0pacw_FiniteLivedCoreDepositsCustomerRelationsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
 
Total assets 185,349us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
  10,565us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
 
Total deposits (354,523)us-gaap_Deposits
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
  (46,283)us-gaap_Deposits
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
 
Capitalsource, Inc. [Member]        
Goodwill       $ 1,526,282us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= pacw_CapitalsourceInc.Member
[1] The increase in goodwill for the Community Banking segment and National Lending segment compared to March 31, 2014, was due primarily to $1.5 billion from the CapitalSource Inc. merger.