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Subsequent event	9 Months Ended
Subsequent event	Sep. 30, 2017
Subsequent Event [Line Items]
Subsequent Events [Text Block]	Subsequent Event On November 1, 2017, the Company completed its previously announced acquisition of Pacific Continental Corporation ("Pacific Continental"), for total consideration of approximately $644.8 million. The Company acquired 100% of the voting equity interests of Pacific Continental. The primary reasons for the acquisition were to expand in the Eugene, Oregon market and improve branch network efficiencies in the Seattle and Portland markets. The operating results of the Company for the nine months ended September 30, 2017 do not include the operating results produced by Pacific Continental as the acquisition did not close until November 1, 2017. It is not practical to present other financial information related to the acquisition at this time because the fair value measurement of assets acquired and liabilities assumed has not been finalized.