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Subsequent Event	9 Months Ended
Subsequent Event	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On October 22, 2018, Umpqua announced the sale of substantially all of the assets of its subsidiary, Pivotus, Inc. to Kony, Inc. Umpqua formed Pivotus in 2015 as an innovation incubator to quickly develop, test, and deliver innovative banking solutions for Umpqua and collaborating financial institutions. Umpqua and Kony will continue to develop the Engage platform Pivotus introduced earlier this year and Umpqua now uses as its Go-To application.