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Securities Sold Under Agreements To Repurchase (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]      
Securities sold under agreements to repurchase average $ 189.5umpq_SecuritiesSoldUnderAgreementsToRepurchaseAverage $ 177.9umpq_SecuritiesSoldUnderAgreementsToRepurchaseAverage $ 142.4umpq_SecuritiesSoldUnderAgreementsToRepurchaseAverage
Securities sold under agreements to repurchase maximum outstanding $ 313.3umpq_SecuritiesSoldUnderAgreementsToRepurchaseMaximumOutstanding $ 233.8umpq_SecuritiesSoldUnderAgreementsToRepurchaseMaximumOutstanding $ 166.3umpq_SecuritiesSoldUnderAgreementsToRepurchaseMaximumOutstanding