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Fair Value Measurement (Schedule Of A Description Of The Valuation Technique, Unobservable Input, And Qualitative Information For The Company's Assets And Liabilities Classified As Level 3) (Details)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Constant prepayment rate 12.39%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed 12.74%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed 21.39%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed
Discount rate 9.17%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate 8.69%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate 8.65%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate
Mortgage Servicing Rights [Member]      
Valuation Technique Discounted cash flow    
Interest Rate Lock Commitments [Member]      
Valuation Technique Internal Pricing Model    
Junior Subordinated Debentures [Member]      
Valuation Technique Discounted cash flow    
Weighted Average [Member] | Mortgage Servicing Rights [Member]      
Constant prepayment rate 12.39%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed
/ us-gaap_FinancialInstrumentAxis
= umpq_MortgageServicingRightsMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
   
Discount rate 9.17%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate
/ us-gaap_FinancialInstrumentAxis
= umpq_MortgageServicingRightsMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
   
Weighted Average [Member] | Interest Rate Lock Commitments [Member]      
Fair Value Inputs, Pull-through Rate 83.90%umpq_FairValueInputsPullThroughRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
   
Weighted Average [Member] | Junior Subordinated Debentures [Member]      
Credit spread 6.18%us-gaap_FairValueInputsEntityCreditRisk
/ us-gaap_FinancialInstrumentAxis
= umpq_JuniorSubordinatedDebenturesMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember