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Shareholders' Equity and Stock Compensation (Narrative) (Details) (USD $)
3 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Apr. 18, 2014
Nov. 30, 2014
Shareholders Equity and Share-Based Payments [Line Items]          
Number of securities called by each warrant       1.671us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight  
Warrant exercise price (usd per share)       12.88us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1  
Shares issued from exercise of warrants     2,889,896umpq_StockIssuedDuringPeriodSharesWarrantsExercised    
Common stock, shares authorized 400,000,000us-gaap_CommonStockSharesAuthorized   400,000,000us-gaap_CommonStockSharesAuthorized 400,000,000us-gaap_CommonStockSharesAuthorized  
Compensation cost $ 3,200,000umpq_SharebasedCompensationExcludingAcceleratedCompensationCost $ 1,500,000umpq_SharebasedCompensationExcludingAcceleratedCompensationCost      
Total income tax benefit recognized related to stock-based compensation 1,200,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 614,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense      
Total intrinsic value of options exercised 1,900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 1,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue      
Cash received from exercise of stock options 144,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions 2,600,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions      
Stock options granted 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross        
Income tax benefits received 2,700,000us-gaap_DeferredTaxExpenseFromStockOptionsExercised 3,300,000us-gaap_DeferredTaxExpenseFromStockOptionsExercised      
Net tax benefit from stock options exercised 528,000umpq_NetTaxBenefitFromStockOptionsExercised        
Tax deficiency from stock options exercised   1,100,000umpq_TaxDeficiencyFromStockOptionsExercised      
Restricted Stock Units (RSUs) [Member]          
Shareholders Equity and Share-Based Payments [Line Items]          
Restricted stock units outstanding, shares 577,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockUnitsRSUMember
  675,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockUnitsRSUMember
   
Restricted stock units outstanding, weighted average grant dare fair value, usd per share $ 18.58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockUnitsRSUMember
  18.03us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockUnitsRSUMember
   
Total unrecognized compensation cost related to nonvested stock awards 7,200,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockUnitsRSUMember
       
Expected recognized over a weighted-average period, years 2 years 3 months 15 days        
Restricted Shares [Member]          
Shareholders Equity and Share-Based Payments [Line Items]          
Total fair value of restricted stock shares/units vested and released 5,100,000us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockMember
5,500,000us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockMember
     
Restricted stock units outstanding, shares 1,604,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockMember
  1,386,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockMember
   
Restricted stock units outstanding, weighted average grant dare fair value, usd per share $ 16.29us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockMember
  15.39us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockMember
   
Total unrecognized compensation cost related to nonvested stock awards 15,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockMember
       
Expected recognized over a weighted-average period, years 1 year 9 months 4 days        
Employee Stock Option [Member]          
Shareholders Equity and Share-Based Payments [Line Items]          
Total unrecognized compensation cost related to nonvested stock awards 240,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockOptionMember
       
Expected recognized over a weighted-average period, years 2 years 7 days        
Restricted Stock Units (RSUs) [Member]          
Shareholders Equity and Share-Based Payments [Line Items]          
Total fair value of restricted stock shares/units vested and released 1,432,000us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
1,302,000us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
     
Employee Stock Option [Member]          
Shareholders Equity and Share-Based Payments [Line Items]          
Cash received from exercise of stock options 89,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
897,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Merger with Sterling Financial Corporation [Member] | Restricted Stock Units (RSUs) [Member]          
Shareholders Equity and Share-Based Payments [Line Items]          
Conversion of stock, shares issued       994,214us-gaap_ConversionOfStockSharesIssued1
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= umpq_MergerwithSterlingFinancialCorporationMember
 
Merger with Sterling Financial Corporation [Member] | Employee Stock Option [Member]          
Shareholders Equity and Share-Based Payments [Line Items]          
Conversion of stock, shares issued       439,921us-gaap_ConversionOfStockSharesIssued1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= umpq_MergerwithSterlingFinancialCorporationMember
 
Merger with Sterling Financial Corporation [Member] | Common Stock [Member]          
Shareholders Equity and Share-Based Payments [Line Items]          
Conversion of stock, shares issued       104,385,087us-gaap_ConversionOfStockSharesIssued1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= umpq_MergerwithSterlingFinancialCorporationMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Merger with Sterling Financial Corporation [Member] | Warrant [Member]          
Shareholders Equity and Share-Based Payments [Line Items]          
Conversion of stock, shares converted       2,960,238us-gaap_ConversionOfStockSharesConverted1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= umpq_MergerwithSterlingFinancialCorporationMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
 
Sterling Financial Corporation [Member]          
Shareholders Equity and Share-Based Payments [Line Items]          
Shares issued from exercise of warrants         2,889,896umpq_StockIssuedDuringPeriodSharesWarrantsExercised
/ us-gaap_BusinessAcquisitionAxis
= umpq_SterlingFinancialCorporationMember
Value of shares issued from exercise of warrants         $ 6,600,000umpq_StockIssuedDuringPeriodValueWarrantsExercised
/ us-gaap_BusinessAcquisitionAxis
= umpq_SterlingFinancialCorporationMember