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Residential Mortgage Servicing Rights (Schedule Of Changes In Mortgage Servicing Rights) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Servicing Asset at Fair Value, Amount [Roll Forward]      
Balance, beginning of period $ 47,765us-gaap_ServicingAssetAtFairValueAmount $ 27,428us-gaap_ServicingAssetAtFairValueAmount $ 18,184us-gaap_ServicingAssetAtFairValueAmount
Acquired/purchased MSR 62,770umpq_ServicingAssetatFairValueAdditionsPurchases 0umpq_ServicingAssetatFairValueAdditionsPurchases 0umpq_ServicingAssetatFairValueAdditionsPurchases
Additions for new MSR capitalized 23,311umpq_ServicingAssetatFairValueAdditionsCapitalization 17,963umpq_ServicingAssetatFairValueAdditionsCapitalization 17,710umpq_ServicingAssetatFairValueAdditionsCapitalization
Due to changes in model inputs or assumptions (5,757)us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions 5,688us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions (4,651)us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions
Other (10,830)us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue (3,314)us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue (3,815)us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue
Balance, end of period $ 117,259us-gaap_ServicingAssetAtFairValueAmount $ 47,765us-gaap_ServicingAssetAtFairValueAmount $ 27,428us-gaap_ServicingAssetAtFairValueAmount