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Residential Mortgage Servicing Rights (Sensitivity Analysis of Current Fair Value to Changes in Discount and Prepayment Speed Assumptions) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Transfers and Servicing [Abstract]    
Effect on fair value of a 10% adverse change $ (5,095)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed $ (4,965)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed
Effect on fair value of a 20% adverse change (9,787)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed (9,547)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed
Effect on fair value of a 100 basis point adverse change (4,293)umpq_SensitivityAnalysisOfFairValueTransferorsInterestsInTransferredFinancialAssetsImpactOfOnePercentAdverseChangeInDiscountRate (4,539)umpq_SensitivityAnalysisOfFairValueTransferorsInterestsInTransferredFinancialAssetsImpactOfOnePercentAdverseChangeInDiscountRate
Effect on fair value of a 200 basis point adverse change $ (8,271)umpq_SensitivityAnalysisOfFairValueTransferorsInterestsInTransferredFinancialAssetsImpactOfTwoPercentAdverseChangeInDiscountRate $ (8,771)umpq_SensitivityAnalysisOfFairValueTransferorsInterestsInTransferredFinancialAssetsImpactOfTwoPercentAdverseChangeInDiscountRate