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Loans and Leases (Narrative) (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2012
Mar. 31, 2014
Receivables [Abstract]        
Deferred loan fees $ 31,700,000us-gaap_LoansAndLeasesReceivableDeferredIncome $ 26,300,000us-gaap_LoansAndLeasesReceivableDeferredIncome $ 4,700,000us-gaap_LoansAndLeasesReceivableDeferredIncome  
Discounts on acquired loans 198,100,000us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums 236,600,000us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums    
Total loans pledged to secure borrowings 8,400,000,000us-gaap_LoansPledgedAsCollateral      
Outstanding contractual unpaid principal balance of non-covered purchased impaired loans 711,200,000umpq_FinancingReceivableAcquiredwithDeterioratedCreditQualityGrossContractualAmount 770,900,000umpq_FinancingReceivableAcquiredwithDeterioratedCreditQualityGrossContractualAmount    
Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans acquired with deteriorated credit quality $ 521,100,000us-gaap_NotesReceivableNet
/ us-gaap_ReceivablesAcquiredWithDeterioratedCreditQualityAxis
= us-gaap_ReceivablesAcquiredWithDeterioratedCreditQualityMember
$ 562,900,000us-gaap_NotesReceivableNet
/ us-gaap_ReceivablesAcquiredWithDeterioratedCreditQualityAxis
= us-gaap_ReceivablesAcquiredWithDeterioratedCreditQualityMember
  $ 334,666,000us-gaap_NotesReceivableNet
/ us-gaap_ReceivablesAcquiredWithDeterioratedCreditQualityAxis
= us-gaap_ReceivablesAcquiredWithDeterioratedCreditQualityMember