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Investment Securities (Gross Realized Gains And Losses On Sales Of Available-For-Sale Securities) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Investment Holdings [Line Items]    
Gains $ 316us-gaap_AvailableForSaleSecuritiesGrossRealizedGains $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Losses 200us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses 0us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Residential Mortgage-Backed Securities And Collateralized Mortgage Obligations [Member]    
Investment Holdings [Line Items]    
Gains 316us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_ResidentialMortgageBackedSecuritiesAndCollateralizedMortgageObligationsMember		 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_ResidentialMortgageBackedSecuritiesAndCollateralizedMortgageObligationsMember
Losses $ 200us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_ResidentialMortgageBackedSecuritiesAndCollateralizedMortgageObligationsMember		 $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_ResidentialMortgageBackedSecuritiesAndCollateralizedMortgageObligationsMember