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Related Party Transactions (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Related Party Transaction, Due from (to) Related Party [Roll Forward]      
Loans outstanding at the beginning of the year $ 13,307,000us-gaap_DueFromRelatedParties $ 12,272,000us-gaap_DueFromRelatedParties $ 12,245,000us-gaap_DueFromRelatedParties
New loans and advances 11,392,000umpq_RelatedPartyNewLoansAndAdvances 3,584,000umpq_RelatedPartyNewLoansAndAdvances 2,697,000umpq_RelatedPartyNewLoansAndAdvances
Less loan repayments (2,490,000)umpq_RelatedPartyLoanRepayments (2,213,000)umpq_RelatedPartyLoanRepayments (2,113,000)umpq_RelatedPartyLoanRepayments
Reclassification (2,491,000)umpq_RelatedPartyReclassificationAdjustment (336,000)umpq_RelatedPartyReclassificationAdjustment (557,000)umpq_RelatedPartyReclassificationAdjustment
Loans outstanding at the end of the year 19,718,000us-gaap_DueFromRelatedParties 13,307,000us-gaap_DueFromRelatedParties 12,272,000us-gaap_DueFromRelatedParties
Deposits of related parties $ 13,700,000us-gaap_RelatedPartyDepositLiabilities $ 15,300,000us-gaap_RelatedPartyDepositLiabilities