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Acquisition Acquisition | 6 Months Ended
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Jun. 30, 2018
Business Combinations [Abstract] |
Business Combination Disclosure [Text Block] | On June 18, 2018, the Company announced the signing of a definitive merger agreement with CoBiz Financial Inc. CoBiz is headquartered in Denver with a presence in Colorado and Arizona and has approximately $3.8 billion in assets. Upon completion of the merger, CoBiz shareholders will receive 0.17 shares of BOK Financial common stock and $5.70 in cash for each share of CoBiz common stock. The merger is subject to customary closing conditions including regulatory approval. On May 1, 2018, the Company acquired a majority voting interest in Switchgrass Holdings, LLC, a restaurant franchise owner and operator, pursuant to merchant banking regulations and restrictions. The purchase price for this acquisition was $14 million. The preliminary purchase price allocation included $6.1 million of goodwill.

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- Definition The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -URI http://asc.fasb.org/topic&trid=2303972 + Details
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