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Junior Subordinated Debentures (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Debt Disclosure [Abstract]      
Common stock issued by Trusts $ 14,300,000umpq_CommonStockIssuedByTrustOwned   $ 14,300,000umpq_CommonStockIssuedByTrustOwned
Loss on junior subordinated debentures carried at fair value $ 1,555,000umpq_GainLossOnChangesInFairValueOfJuniorSubordinatedDebentures $ 542,000umpq_GainLossOnChangesInFairValueOfJuniorSubordinatedDebentures