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Subsequent event | 9 Months Ended
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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.

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Definition The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 855 -URI http://asc.fasb.org/topic&trid=2122774 + Details
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