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Securities Sold Under Agreements To Repurchase (Securities Sold Under Agreements to Repurchase) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Repurchase Amount	$ 313,321	$ 224,882
Weighted Average Interest Rate	0.04%umpq_WeightedAverageInterestRate	0.07%umpq_WeightedAverageInterestRate
Carrying Value of Underlying Assets	411,569	229,439
Market Value of Underlying Assets	$ 411,569	$ 229,439

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement.

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