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Investment Securities (Amortized Cost, Unrealized Gains And Losses, And Fair Value Of Investment Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Investment Holdings [Line Items]    
Available-for-sale Securities, Amortized Cost $ 2,278,932us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 1,799,178us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale Securities, Unrealized Gains 31,524umpq_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax 23,195umpq_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
Available-for-sale Securities, Unrealized Losses (11,901)umpq_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax (31,395)umpq_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
Available for sale, at fair value 2,298,555us-gaap_AvailableForSaleSecurities 1,790,978us-gaap_AvailableForSaleSecurities
Held to maturity, at amortized cost 5,211us-gaap_HeldToMaturitySecurities 5,563us-gaap_HeldToMaturitySecurities
Held-to-maturity Securities, Unrecognized Gains 358umpq_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGain 330umpq_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGain
Held-to-maturity Securities, Unrecognized Losses (15)umpq_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingLoss (19)umpq_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
Held-to-maturity Securities, Fair Value 5,554us-gaap_HeldToMaturitySecuritiesFairValue 5,874us-gaap_HeldToMaturitySecuritiesFairValue
U.S. Treasury And Agencies [Member]    
Investment Holdings [Line Items]    
Available-for-sale Securities, Amortized Cost 213us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
249us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
Available-for-sale Securities, Unrealized Gains 16umpq_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
20umpq_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
Available-for-sale Securities, Unrealized Losses 0umpq_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
(1)umpq_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
Available for sale, at fair value 229us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
268us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
Obligations Of States And Political Subdivisions [Member]    
Investment Holdings [Line Items]    
Available-for-sale Securities, Amortized Cost 325,189us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
229,969us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale Securities, Unrealized Gains 14,056umpq_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
7,811umpq_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale Securities, Unrealized Losses (841)umpq_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
(2,575)umpq_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available for sale, at fair value 338,404us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
235,205us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Residential Mortgage-Backed Securities And Collateralized Mortgage Obligations [Member]    
Investment Holdings [Line Items]    
Available-for-sale Securities, Amortized Cost 1,951,514us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_ResidentialMortgageBackedSecuritiesAndCollateralizedMortgageObligationsMember
1,567,001us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_ResidentialMortgageBackedSecuritiesAndCollateralizedMortgageObligationsMember
Available-for-sale Securities, Unrealized Gains 17,398umpq_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_ResidentialMortgageBackedSecuritiesAndCollateralizedMortgageObligationsMember
15,359umpq_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_ResidentialMortgageBackedSecuritiesAndCollateralizedMortgageObligationsMember
Available-for-sale Securities, Unrealized Losses (11,060)umpq_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_ResidentialMortgageBackedSecuritiesAndCollateralizedMortgageObligationsMember
(28,819)umpq_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_ResidentialMortgageBackedSecuritiesAndCollateralizedMortgageObligationsMember
Available for sale, at fair value 1,957,852us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_ResidentialMortgageBackedSecuritiesAndCollateralizedMortgageObligationsMember
1,553,541us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_ResidentialMortgageBackedSecuritiesAndCollateralizedMortgageObligationsMember
Held to maturity, at amortized cost 5,088us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_ResidentialMortgageBackedSecuritiesAndCollateralizedMortgageObligationsMember
5,563us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_ResidentialMortgageBackedSecuritiesAndCollateralizedMortgageObligationsMember
Held-to-maturity Securities, Unrecognized Gains 358umpq_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_ResidentialMortgageBackedSecuritiesAndCollateralizedMortgageObligationsMember
330umpq_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_ResidentialMortgageBackedSecuritiesAndCollateralizedMortgageObligationsMember
Held-to-maturity Securities, Unrecognized Losses (15)umpq_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_ResidentialMortgageBackedSecuritiesAndCollateralizedMortgageObligationsMember
(19)umpq_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_ResidentialMortgageBackedSecuritiesAndCollateralizedMortgageObligationsMember
Held-to-maturity Securities, Fair Value 5,431us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_ResidentialMortgageBackedSecuritiesAndCollateralizedMortgageObligationsMember
5,874us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_ResidentialMortgageBackedSecuritiesAndCollateralizedMortgageObligationsMember
Other Investment Securities [Member]    
Investment Holdings [Line Items]    
Held to maturity, at amortized cost 123us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_OtherInvestmentSecuritiesMember
 
Held-to-maturity Securities, Unrecognized Gains 0umpq_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_OtherInvestmentSecuritiesMember
 
Held-to-maturity Securities, Unrecognized Losses 0umpq_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_OtherInvestmentSecuritiesMember
 
Held-to-maturity Securities, Fair Value 123us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_OtherInvestmentSecuritiesMember
 
Investments In Mutual Funds And Other Equity Securities [Member]    
Investment Holdings [Line Items]    
Available-for-sale Securities, Amortized Cost 2,016us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_InvestmentsInMutualFundsAndOtherEquitySecuritiesMember
1,959us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_InvestmentsInMutualFundsAndOtherEquitySecuritiesMember
Available-for-sale Securities, Unrealized Gains 54umpq_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_InvestmentsInMutualFundsAndOtherEquitySecuritiesMember
5umpq_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_InvestmentsInMutualFundsAndOtherEquitySecuritiesMember
Available-for-sale Securities, Unrealized Losses 0umpq_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_InvestmentsInMutualFundsAndOtherEquitySecuritiesMember
0umpq_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_InvestmentsInMutualFundsAndOtherEquitySecuritiesMember
Available for sale, at fair value $ 2,070us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_InvestmentsInMutualFundsAndOtherEquitySecuritiesMember
$ 1,964us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= umpq_InvestmentsInMutualFundsAndOtherEquitySecuritiesMember