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Commitments and Contingencies (Schedule Of Commitments And Contingencies) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]    
Commitments and contingent liabilities      
Commitments To Extend Credit [Member]    
Loss Contingencies [Line Items]    
Commitments and contingent liabilities 2,996,411us-gaap_CommitmentsAndContingencies
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_CommitmentsToExtendCreditMember
 
Commitments To Extend Overdrafts [Member]    
Loss Contingencies [Line Items]    
Commitments and contingent liabilities 940,366us-gaap_CommitmentsAndContingencies
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= umpq_CommitmentsToExtendOverdraftsMember
 
Forward Sales Commitments [Member]    
Loss Contingencies [Line Items]    
Commitments and contingent liabilities 692,900us-gaap_CommitmentsAndContingencies
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= umpq_ForwardSalesCommitmentsMember
 
Commitments To Originate Loans Held For Sale [Member]    
Loss Contingencies [Line Items]    
Commitments and contingent liabilities 458,378us-gaap_CommitmentsAndContingencies
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= umpq_CommitmentsToOriginateLoansHeldForSaleMember
 
Standby Letters Of Credit [Member]    
Loss Contingencies [Line Items]    
Commitments and contingent liabilities $ 56,622us-gaap_CommitmentsAndContingencies
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_StandbyLettersOfCreditMember