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Allowance for Loan and Lease Loss and Credit Quality (Schedule Of Troubled Debt Restructuring By Accrual versus Non-Accrual Status) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Modifications [Line Items]    
Financing Receivable Modifications Recorded Investments $ 64,906us-gaap_FinancingReceivableModificationsRecordedInvestment $ 66,696us-gaap_FinancingReceivableModificationsRecordedInvestment
Accrual Status [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable Modifications Recorded Investments 60,896us-gaap_FinancingReceivableModificationsRecordedInvestment
/ umpq_TroubledDebtRestructuringsAccrualStatusAxis
= umpq_AccrualStatusMember		 54,836us-gaap_FinancingReceivableModificationsRecordedInvestment
/ umpq_TroubledDebtRestructuringsAccrualStatusAxis
= umpq_AccrualStatusMember
Non-Accrual Status [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable Modifications Recorded Investments 4,010us-gaap_FinancingReceivableModificationsRecordedInvestment
/ umpq_TroubledDebtRestructuringsAccrualStatusAxis
= umpq_NonAccrualStatusMember		 11,860us-gaap_FinancingReceivableModificationsRecordedInvestment
/ umpq_TroubledDebtRestructuringsAccrualStatusAxis
= umpq_NonAccrualStatusMember
Commercial Real Estate [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable Modifications Recorded Investments 49,270us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 51,136us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate [Member] | Accrual Status [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable Modifications Recorded Investments 48,593us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ umpq_TroubledDebtRestructuringsAccrualStatusAxis
= umpq_AccrualStatusMember		 48,817us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ umpq_TroubledDebtRestructuringsAccrualStatusAxis
= umpq_AccrualStatusMember
Commercial Real Estate [Member] | Non-Accrual Status [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable Modifications Recorded Investments 677us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ umpq_TroubledDebtRestructuringsAccrualStatusAxis
= umpq_NonAccrualStatusMember		 2,319us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ umpq_TroubledDebtRestructuringsAccrualStatusAxis
= umpq_NonAccrualStatusMember
Commercial [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable Modifications Recorded Investments 12,051us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 14,945us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial [Member] | Accrual Status [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable Modifications Recorded Investments 8,718us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ umpq_TroubledDebtRestructuringsAccrualStatusAxis
= umpq_AccrualStatusMember		 5,404us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ umpq_TroubledDebtRestructuringsAccrualStatusAxis
= umpq_AccrualStatusMember
Commercial [Member] | Non-Accrual Status [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable Modifications Recorded Investments 3,333us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ umpq_TroubledDebtRestructuringsAccrualStatusAxis
= umpq_NonAccrualStatusMember		 9,541us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ umpq_TroubledDebtRestructuringsAccrualStatusAxis
= umpq_NonAccrualStatusMember
Residential [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable Modifications Recorded Investments 3,585us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 615us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Residential [Member] | Accrual Status [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable Modifications Recorded Investments 3,585us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ umpq_TroubledDebtRestructuringsAccrualStatusAxis
= umpq_AccrualStatusMember		 615us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ umpq_TroubledDebtRestructuringsAccrualStatusAxis
= umpq_AccrualStatusMember
Residential [Member] | Non-Accrual Status [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable Modifications Recorded Investments $ 0us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ umpq_TroubledDebtRestructuringsAccrualStatusAxis
= umpq_NonAccrualStatusMember		 $ 0us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ umpq_TroubledDebtRestructuringsAccrualStatusAxis
= umpq_NonAccrualStatusMember